diff options
Diffstat (limited to 'drivers/ide/ide-tape.c')
| -rw-r--r-- | drivers/ide/ide-tape.c | 5333 |
1 files changed, 1228 insertions, 4105 deletions
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c index 0101d0def7c..1793aea4a7d 100644 --- a/drivers/ide/ide-tape.c +++ b/drivers/ide/ide-tape.c @@ -1,9 +1,8 @@ /* - * linux/drivers/ide/ide-tape.c Version 1.19 Nov, 2003 - * - * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il> + * IDE ATAPI streaming tape driver. * - * $Header$ + * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> + * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz * * This driver was constructed as a student project in the software laboratory * of the faculty of electrical engineering in the Technion - Israel's @@ -11,420 +10,15 @@ * * It is hereby placed under the terms of the GNU general public license. * (See linux/COPYING). - */ - -/* - * IDE ATAPI streaming tape driver. - * - * This driver is a part of the Linux ide driver and works in co-operation - * with linux/drivers/block/ide.c. - * - * The driver, in co-operation with ide.c, basically traverses the - * request-list for the block device interface. The character device - * interface, on the other hand, creates new requests, adds them - * to the request-list of the block device, and waits for their completion. - * - * Pipelined operation mode is now supported on both reads and writes. - * - * The block device major and minor numbers are determined from the - * tape's relative position in the ide interfaces, as explained in ide.c. - * - * The character device interface consists of the following devices: - * - * ht0 major 37, minor 0 first IDE tape, rewind on close. - * ht1 major 37, minor 1 second IDE tape, rewind on close. - * ... - * nht0 major 37, minor 128 first IDE tape, no rewind on close. - * nht1 major 37, minor 129 second IDE tape, no rewind on close. - * ... - * - * Run linux/scripts/MAKEDEV.ide to create the above entries. - * - * The general magnetic tape commands compatible interface, as defined by - * include/linux/mtio.h, is accessible through the character device. - * - * General ide driver configuration options, such as the interrupt-unmask - * flag, can be configured by issuing an ioctl to the block device interface, - * as any other ide device. - * - * Our own ide-tape ioctl's can be issued to either the block device or - * the character device interface. - * - * Maximal throughput with minimal bus load will usually be achieved in the - * following scenario: - * - * 1. ide-tape is operating in the pipelined operation mode. - * 2. No buffering is performed by the user backup program. - * - * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive. - * - * Ver 0.1 Nov 1 95 Pre-working code :-) - * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure - * was successful ! (Using tar cvf ... on the block - * device interface). - * A longer backup resulted in major swapping, bad - * overall Linux performance and eventually failed as - * we received non serial read-ahead requests from the - * buffer cache. - * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the - * character device interface. Linux's responsiveness - * and performance doesn't seem to be much affected - * from the background backup procedure. - * Some general mtio.h magnetic tape operations are - * now supported by our character device. As a result, - * popular tape utilities are starting to work with - * ide tapes :-) - * The following configurations were tested: - * 1. An IDE ATAPI TAPE shares the same interface - * and irq with an IDE ATAPI CDROM. - * 2. An IDE ATAPI TAPE shares the same interface - * and irq with a normal IDE disk. - * Both configurations seemed to work just fine ! - * However, to be on the safe side, it is meanwhile - * recommended to give the IDE TAPE its own interface - * and irq. - * The one thing which needs to be done here is to - * add a "request postpone" feature to ide.c, - * so that we won't have to wait for the tape to finish - * performing a long media access (DSC) request (such - * as a rewind) before we can access the other device - * on the same interface. This effect doesn't disturb - * normal operation most of the time because read/write - * requests are relatively fast, and once we are - * performing one tape r/w request, a lot of requests - * from the other device can be queued and ide.c will - * service all of them after this single tape request. - * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree. - * On each read / write request, we now ask the drive - * if we can transfer a constant number of bytes - * (a parameter of the drive) only to its buffers, - * without causing actual media access. If we can't, - * we just wait until we can by polling the DSC bit. - * This ensures that while we are not transferring - * more bytes than the constant referred to above, the - * interrupt latency will not become too high and - * we won't cause an interrupt timeout, as happened - * occasionally in the previous version. - * While polling for DSC, the current request is - * postponed and ide.c is free to handle requests from - * the other device. This is handled transparently to - * ide.c. The hwgroup locking method which was used - * in the previous version was removed. - * Use of new general features which are provided by - * ide.c for use with atapi devices. - * (Programming done by Mark Lord) - * Few potential bug fixes (Again, suggested by Mark) - * Single character device data transfers are now - * not limited in size, as they were before. - * We are asking the tape about its recommended - * transfer unit and send a larger data transfer - * as several transfers of the above size. - * For best results, use an integral number of this - * basic unit (which is shown during driver - * initialization). I will soon add an ioctl to get - * this important parameter. - * Our data transfer buffer is allocated on startup, - * rather than before each data transfer. This should - * ensure that we will indeed have a data buffer. - * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape - * shared an interface with another device. - * (poll_for_dsc was a complete mess). - * Removed some old (non-active) code which had - * to do with supporting buffer cache originated - * requests. - * The block device interface can now be opened, so - * that general ide driver features like the unmask - * interrupts flag can be selected with an ioctl. - * This is the only use of the block device interface. - * New fast pipelined operation mode (currently only on - * writes). When using the pipelined mode, the - * throughput can potentially reach the maximum - * tape supported throughput, regardless of the - * user backup program. On my tape drive, it sometimes - * boosted performance by a factor of 2. Pipelined - * mode is enabled by default, but since it has a few - * downfalls as well, you may want to disable it. - * A short explanation of the pipelined operation mode - * is available below. - * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition. - * Added pipeline read mode. As a result, restores - * are now as fast as backups. - * Optimized shared interface behavior. The new behavior - * typically results in better IDE bus efficiency and - * higher tape throughput. - * Pre-calculation of the expected read/write request - * service time, based on the tape's parameters. In - * the pipelined operation mode, this allows us to - * adjust our polling frequency to a much lower value, - * and thus to dramatically reduce our load on Linux, - * without any decrease in performance. - * Implemented additional mtio.h operations. - * The recommended user block size is returned by - * the MTIOCGET ioctl. - * Additional minor changes. - * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the - * use of some block sizes during a restore procedure. - * The character device interface will now present a - * continuous view of the media - any mix of block sizes - * during a backup/restore procedure is supported. The - * driver will buffer the requests internally and - * convert them to the tape's recommended transfer - * unit, making performance almost independent of the - * chosen user block size. - * Some improvements in error recovery. - * By cooperating with ide-dma.c, bus mastering DMA can - * now sometimes be used with IDE tape drives as well. - * Bus mastering DMA has the potential to dramatically - * reduce the CPU's overhead when accessing the device, - * and can be enabled by using hdparm -d1 on the tape's - * block device interface. For more info, read the - * comments in ide-dma.c. - * Ver 1.4 Mar 13 96 Fixed serialize support. - * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85. - * Fixed pipelined read mode inefficiency. - * Fixed nasty null dereferencing bug. - * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver. - * Fixed end of media bug. - * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model. - * Ver 1.8 Sep 26 96 Attempt to find a better balance between good - * interactive response and high system throughput. - * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather - * than requiring an explicit FSF command. - * Abort pending requests at end of media. - * MTTELL was sometimes returning incorrect results. - * Return the real block size in the MTIOCGET ioctl. - * Some error recovery bug fixes. - * Ver 1.10 Nov 5 96 Major reorganization. - * Reduced CPU overhead a bit by eliminating internal - * bounce buffers. - * Added module support. - * Added multiple tape drives support. - * Added partition support. - * Rewrote DSC handling. - * Some portability fixes. - * Removed ide-tape.h. - * Additional minor changes. - * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling. - * Use ide_stall_queue() for DSC overlap. - * Use the maximum speed rather than the current speed - * to compute the request service time. - * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data - * corruption, which could occur if the total number - * of bytes written to the tape was not an integral - * number of tape blocks. - * Add support for INTERRUPT DRQ devices. - * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB - * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives. - * Replace cli()/sti() with hwgroup spinlocks. - * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup - * spinlock with private per-tape spinlock. - * Ver 1.16 Sep 1 99 Add OnStream tape support. - * Abort read pipeline on EOD. - * Wait for the tape to become ready in case it returns - * "in the process of becoming ready" on open(). - * Fix zero padding of the last written block in - * case the tape block size is larger than PAGE_SIZE. - * Decrease the default disconnection time to tn. - * Ver 1.16e Oct 3 99 Minor fixes. - * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen, - * niessen@iae.nl / arnold.niessen@philips.com - * GO-1) Undefined code in idetape_read_position - * according to Gadi's email - * AJN-1) Minor fix asc == 11 should be asc == 0x11 - * in idetape_issue_packet_command (did effect - * debugging output only) - * AJN-2) Added more debugging output, and - * added ide-tape: where missing. I would also - * like to add tape->name where possible - * AJN-3) Added different debug_level's - * via /proc/ide/hdc/settings - * "debug_level" determines amount of debugging output; - * can be changed using /proc/ide/hdx/settings - * 0 : almost no debugging output - * 1 : 0+output errors only - * 2 : 1+output all sensekey/asc - * 3 : 2+follow all chrdev related procedures - * 4 : 3+follow all procedures - * 5 : 4+include pc_stack rq_stack info - * 6 : 5+USE_COUNT updates - * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail - * from 5 to 10 minutes - * AJN-5) Changed maximum number of blocks to skip when - * reading tapes with multiple consecutive write - * errors from 100 to 1000 in idetape_get_logical_blk - * Proposed changes to code: - * 1) output "logical_blk_num" via /proc - * 2) output "current_operation" via /proc - * 3) Either solve or document the fact that `mt rewind' is - * required after reading from /dev/nhtx to be - * able to rmmod the idetape module; - * Also, sometimes an application finishes but the - * device remains `busy' for some time. Same cause ? - * Proposed changes to release-notes: - * 4) write a simple `quickstart' section in the - * release notes; I volunteer if you don't want to - * 5) include a pointer to video4linux in the doc - * to stimulate video applications - * 6) release notes lines 331 and 362: explain what happens - * if the application data rate is higher than 1100 KB/s; - * similar approach to lower-than-500 kB/s ? - * 7) 6.6 Comparison; wouldn't it be better to allow different - * strategies for read and write ? - * Wouldn't it be better to control the tape buffer - * contents instead of the bandwidth ? - * 8) line 536: replace will by would (if I understand - * this section correctly, a hypothetical and unwanted situation - * is being described) - * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames. - * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl - * - Add idetape_onstream_mode_sense_tape_parameter_page - * function to get tape capacity in frames: tape->capacity. - * - Add support for DI-50 drives( or any DI- drive). - * - 'workaround' for read error/blank block around block 3000. - * - Implement Early warning for end of media for Onstream. - * - Cosmetic code changes for readability. - * - Idetape_position_tape should not use SKIP bit during - * Onstream read recovery. - * - Add capacity, logical_blk_num and first/last_frame_position - * to /proc/ide/hd?/settings. - * - Module use count was gone in the Linux 2.4 driver. - * Ver 1.17a Apr 2001 Willem Riede osst@riede.org - * - Get drive's actual block size from mode sense block descriptor - * - Limit size of pipeline - * Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu> - * Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used - * it in the code! - * Actually removed aborted stages in idetape_abort_pipeline - * instead of just changing the command code. - * Made the transfer byte count for Request Sense equal to the - * actual length of the data transfer. - * Changed handling of partial data transfers: they do not - * cause DMA errors. - * Moved initiation of DMA transfers to the correct place. - * Removed reference to unallocated memory. - * Made __idetape_discard_read_pipeline return the number of - * sectors skipped, not the number of stages. - * Replaced errant kfree() calls with __idetape_kfree_stage(). - * Fixed off-by-one error in testing the pipeline length. - * Fixed handling of filemarks in the read pipeline. - * Small code optimization for MTBSF and MTBSFM ioctls. - * Don't try to unlock the door during device close if is - * already unlocked! - * Cosmetic fixes to miscellaneous debugging output messages. - * Set the minimum /proc/ide/hd?/settings values for "pipeline", - * "pipeline_min", and "pipeline_max" to 1. - * - * Here are some words from the first releases of hd.c, which are quoted - * in ide.c and apply here as well: - * - * | Special care is recommended. Have Fun! * + * For a historical changelog see + * Documentation/ide/ChangeLog.ide-tape.1995-2002 */ -/* - * An overview of the pipelined operation mode. - * - * In the pipelined write mode, we will usually just add requests to our - * pipeline and return immediately, before we even start to service them. The - * user program will then have enough time to prepare the next request while - * we are still busy servicing previous requests. In the pipelined read mode, - * the situation is similar - we add read-ahead requests into the pipeline, - * before the user even requested them. - * - * The pipeline can be viewed as a "safety net" which will be activated when - * the system load is high and prevents the user backup program from keeping up - * with the current tape speed. At this point, the pipeline will get - * shorter and shorter but the tape will still be streaming at the same speed. - * Assuming we have enough pipeline stages, the system load will hopefully - * decrease before the pipeline is completely empty, and the backup program - * will be able to "catch up" and refill the pipeline again. - * - * When using the pipelined mode, it would be best to disable any type of - * buffering done by the user program, as ide-tape already provides all the - * benefits in the kernel, where it can be done in a more efficient way. - * As we will usually not block the user program on a request, the most - * efficient user code will then be a simple read-write-read-... cycle. - * Any additional logic will usually just slow down the backup process. - * - * Using the pipelined mode, I get a constant over 400 KBps throughput, - * which seems to be the maximum throughput supported by my tape. - * - * However, there are some downfalls: - * - * 1. We use memory (for data buffers) in proportional to the number - * of pipeline stages (each stage is about 26 KB with my tape). - * 2. In the pipelined write mode, we cheat and postpone error codes - * to the user task. In read mode, the actual tape position - * will be a bit further than the last requested block. - * - * Concerning (1): - * - * 1. We allocate stages dynamically only when we need them. When - * we don't need them, we don't consume additional memory. In - * case we can't allocate stages, we just manage without them - * (at the expense of decreased throughput) so when Linux is - * tight in memory, we will not pose additional difficulties. - * - * 2. The maximum number of stages (which is, in fact, the maximum - * amount of memory) which we allocate is limited by the compile - * time parameter IDETAPE_MAX_PIPELINE_STAGES. - * - * 3. The maximum number of stages is a controlled parameter - We - * don't start from the user defined maximum number of stages - * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we - * will not even allocate this amount of stages if the user - * program can't handle the speed). We then implement a feedback - * loop which checks if the pipeline is empty, and if it is, we - * increase the maximum number of stages as necessary until we - * reach the optimum value which just manages to keep the tape - * busy with minimum allocated memory or until we reach - * IDETAPE_MAX_PIPELINE_STAGES. - * - * Concerning (2): - * - * In pipelined write mode, ide-tape can not return accurate error codes - * to the user program since we usually just add the request to the - * pipeline without waiting for it to be serviced. In case an error - * occurs, I will report it on the next user request. - * - * In the pipelined read mode, subsequent read requests or forward - * filemark spacing will perform correctly, as we preserve all blocks - * and filemarks which we encountered during our excess read-ahead. - * - * For accurate tape positioning and error reporting, disabling - * pipelined mode might be the best option. - * - * You can enable/disable/tune the pipelined operation mode by adjusting - * the compile time parameters below. - */ - -/* - * Possible improvements. - * - * 1. Support for the ATAPI overlap protocol. - * - * In order to maximize bus throughput, we currently use the DSC - * overlap method which enables ide.c to service requests from the - * other device while the tape is busy executing a command. The - * DSC overlap method involves polling the tape's status register - * for the DSC bit, and servicing the other device while the tape - * isn't ready. - * - * In the current QIC development standard (December 1995), - * it is recommended that new tape drives will *in addition* - * implement the ATAPI overlap protocol, which is used for the - * same purpose - efficient use of the IDE bus, but is interrupt - * driven and thus has much less CPU overhead. - * - * ATAPI overlap is likely to be supported in most new ATAPI - * devices, including new ATAPI cdroms, and thus provides us - * a method by which we can achieve higher throughput when - * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. - */ +#define DRV_NAME "ide-tape" -#define IDETAPE_VERSION "1.19" +#define IDETAPE_VERSION "1.20" -#include <linux/config.h> #include <linux/module.h> #include <linux/types.h> #include <linux/string.h> @@ -433,177 +27,77 @@ #include <linux/timer.h> #include <linux/mm.h> #include <linux/interrupt.h> +#include <linux/jiffies.h> #include <linux/major.h> -#include <linux/devfs_fs_kernel.h> #include <linux/errno.h> #include <linux/genhd.h> +#include <linux/seq_file.h> #include <linux/slab.h> #include <linux/pci.h> #include <linux/ide.h> -#include <linux/smp_lock.h> #include <linux/completion.h> #include <linux/bitops.h> +#include <linux/mutex.h> +#include <scsi/scsi.h> #include <asm/byteorder.h> -#include <asm/irq.h> -#include <asm/uaccess.h> -#include <asm/io.h> +#include <linux/uaccess.h> +#include <linux/io.h> #include <asm/unaligned.h> - -/* - * partition - */ -typedef struct os_partition_s { - __u8 partition_num; - __u8 par_desc_ver; - __u16 wrt_pass_cntr; - __u32 first_frame_addr; - __u32 last_frame_addr; - __u32 eod_frame_addr; -} os_partition_t; - -/* - * DAT entry - */ -typedef struct os_dat_entry_s { - __u32 blk_sz; - __u16 blk_cnt; - __u8 flags; - __u8 reserved; -} os_dat_entry_t; - -/* - * DAT - */ -#define OS_DAT_FLAGS_DATA (0xc) -#define OS_DAT_FLAGS_MARK (0x1) - -typedef struct os_dat_s { - __u8 dat_sz; - __u8 reserved1; - __u8 entry_cnt; - __u8 reserved3; - os_dat_entry_t dat_list[16]; -} os_dat_t; - #include <linux/mtio.h> -/**************************** Tunable parameters *****************************/ - +/* define to see debug info */ +#undef IDETAPE_DEBUG_LOG -/* - * Pipelined mode parameters. - * - * We try to use the minimum number of stages which is enough to - * keep the tape constantly streaming. To accomplish that, we implement - * a feedback loop around the maximum number of stages: - * - * We start from MIN maximum stages (we will not even use MIN stages - * if we don't need them), increment it by RATE*(MAX-MIN) - * whenever we sense that the pipeline is empty, until we reach - * the optimum value or until we reach MAX. - * - * Setting the following parameter to 0 is illegal: the pipelined mode - * cannot be disabled (calculate_speeds() divides by tape->max_stages.) - */ -#define IDETAPE_MIN_PIPELINE_STAGES 1 -#define IDETAPE_MAX_PIPELINE_STAGES 400 -#define IDETAPE_INCREASE_STAGES_RATE 20 - -/* - * The following are used to debug the driver: - * - * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. - * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. - * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in - * some places. - * - * Setting them to 0 will restore normal operation mode: - * - * 1. Disable logging normal successful operations. - * 2. Disable self-sanity checks. - * 3. Errors will still be logged, of course. - * - * All the #if DEBUG code will be removed some day, when the driver - * is verified to be stable enough. This will make it much more - * esthetic. - */ -#define IDETAPE_DEBUG_INFO 0 -#define IDETAPE_DEBUG_LOG 0 -#define IDETAPE_DEBUG_BUGS 1 +#ifdef IDETAPE_DEBUG_LOG +#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args) +#else +#define ide_debug_log(lvl, fmt, args...) do {} while (0) +#endif +/**************************** Tunable parameters *****************************/ /* - * After each failed packet command we issue a request sense command - * and retry the packet command IDETAPE_MAX_PC_RETRIES times. + * After each failed packet command we issue a request sense command and retry + * the packet command IDETAPE_MAX_PC_RETRIES times. * - * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. + * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. */ #define IDETAPE_MAX_PC_RETRIES 3 /* - * With each packet command, we allocate a buffer of - * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet - * commands (Not for READ/WRITE commands). - */ -#define IDETAPE_PC_BUFFER_SIZE 256 - -/* - * In various places in the driver, we need to allocate storage - * for packet commands and requests, which will remain valid while - * we leave the driver to wait for an interrupt or a timeout event. - */ -#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) - -/* - * Some drives (for example, Seagate STT3401A Travan) require a very long - * timeout, because they don't return an interrupt or clear their busy bit - * until after the command completes (even retension commands). - */ -#define IDETAPE_WAIT_CMD (900*HZ) - -/* - * The following parameter is used to select the point in the internal - * tape fifo in which we will start to refill the buffer. Decreasing - * the following parameter will improve the system's latency and - * interactive response, while using a high value might improve sytem - * throughput. + * The following parameter is used to select the point in the internal tape fifo + * in which we will start to refill the buffer. Decreasing the following + * parameter will improve the system's latency and interactive response, while + * using a high value might improve system throughput. */ -#define IDETAPE_FIFO_THRESHOLD 2 +#define IDETAPE_FIFO_THRESHOLD 2 /* - * DSC polling parameters. + * DSC polling parameters. * - * Polling for DSC (a single bit in the status register) is a very - * important function in ide-tape. There are two cases in which we - * poll for DSC: + * Polling for DSC (a single bit in the status register) is a very important + * function in ide-tape. There are two cases in which we poll for DSC: * - * 1. Before a read/write packet command, to ensure that we - * can transfer data from/to the tape's data buffers, without - * causing an actual media access. In case the tape is not - * ready yet, we take out our request from the device - * request queue, so that ide.c will service requests from - * the other device on the same interface meanwhile. + * 1. Before a read/write packet command, to ensure that we can transfer data + * from/to the tape's data buffers, without causing an actual media access. + * In case the tape is not ready yet, we take out our request from the device + * request queue, so that ide.c could service requests from the other device + * on the same interface in the meantime. * - * 2. After the successful initialization of a "media access - * packet command", which is a command which can take a long - * time to complete (it can be several seconds or even an hour). + * 2. After the successful initialization of a "media access packet command", + * which is a command that can take a long time to complete (the interval can + * range from several seconds to even an hour). Again, we postpone our request + * in the middle to free the bus for the other device. The polling frequency + * here should be lower than the read/write frequency since those media access + * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST + * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD + * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). * - * Again, we postpone our request in the middle to free the bus - * for the other device. The polling frequency here should be - * lower than the read/write frequency since those media access - * commands are slow. We start from a "fast" frequency - - * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC - * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a - * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). - * - * We also set a timeout for the timer, in case something goes wrong. - * The timeout should be longer then the maximum execution time of a - * tape operation. - */ - -/* - * DSC timings. + * We also set a timeout for the timer, in case something goes wrong. The + * timeout should be longer then the maximum execution time of a tape operation. */ + +/* DSC timings. */ #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ @@ -614,1538 +108,357 @@ typedef struct os_dat_s { /*************************** End of tunable parameters ***********************/ -/* - * Debugging/Performance analysis - * - * I/O trace support - */ -#define USE_IOTRACE 0 -#if USE_IOTRACE -#include <linux/io_trace.h> -#define IO_IDETAPE_FIFO 500 -#endif - -/* - * Read/Write error simulation - */ -#define SIMULATE_ERRORS 0 - -/* - * For general magnetic tape device compatibility. - */ -typedef enum { - idetape_direction_none, - idetape_direction_read, - idetape_direction_write -} idetape_chrdev_direction_t; - -struct idetape_bh { - unsigned short b_size; - atomic_t b_count; - struct idetape_bh *b_reqnext; - char *b_data; +/* tape directions */ +enum { + IDETAPE_DIR_NONE = (1 << 0), + IDETAPE_DIR_READ = (1 << 1), + IDETAPE_DIR_WRITE = (1 << 2), }; -/* - * Our view of a packet command. - */ -typedef struct idetape_packet_command_s { - u8 c[12]; /* Actual packet bytes */ - int retries; /* On each retry, we increment retries */ - int error; /* Error code */ - int request_transfer; /* Bytes to transfer */ - int actually_transferred; /* Bytes actually transferred */ - int buffer_size; /* Size of our data buffer */ - struct idetape_bh *bh; - char *b_data; - int b_count; - u8 *buffer; /* Data buffer */ - u8 *current_position; /* Pointer into the above buffer */ - ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ - u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ - unsigned long flags; /* Status/Action bit flags: long for set_bit */ -} idetape_pc_t; - -/* - * Packet command flag bits. - */ -/* Set when an error is considered normal - We won't retry */ -#define PC_ABORT 0 -/* 1 When polling for DSC on a media access command */ -#define PC_WAIT_FOR_DSC 1 -/* 1 when we prefer to use DMA if possible */ -#define PC_DMA_RECOMMENDED 2 -/* 1 while DMA in progress */ -#define PC_DMA_IN_PROGRESS 3 -/* 1 when encountered problem during DMA */ -#define PC_DMA_ERROR 4 -/* Data direction */ -#define PC_WRITING 5 - -/* - * Capabilities and Mechanical Status Page - */ -typedef struct { - unsigned page_code :6; /* Page code - Should be 0x2a */ - __u8 reserved0_6 :1; - __u8 ps :1; /* parameters saveable */ - __u8 page_length; /* Page Length - Should be 0x12 */ - __u8 reserved2, reserved3; - unsigned ro :1; /* Read Only Mode */ - unsigned reserved4_1234 :4; - unsigned sprev :1; /* Supports SPACE in the reverse direction */ - unsigned reserved4_67 :2; - unsigned reserved5_012 :3; - unsigned efmt :1; /* Supports ERASE command initiated formatting */ - unsigned reserved5_4 :1; - unsigned qfa :1; /* Supports the QFA two partition formats */ - unsigned reserved5_67 :2; - unsigned lock :1; /* Supports locking the volume */ - unsigned locked :1; /* The volume is locked */ - unsigned prevent :1; /* The device defaults in the prevent state after power up */ - unsigned eject :1; /* The device can eject the volume */ - __u8 disconnect :1; /* The device can break request > ctl */ - __u8 reserved6_5 :1; - unsigned ecc :1; /* Supports error correction */ - unsigned cmprs :1; /* Supports data compression */ - unsigned reserved7_0 :1; - unsigned blk512 :1; /* Supports 512 bytes block size */ - unsigned blk1024 :1; /* Supports 1024 bytes block size */ - unsigned reserved7_3_6 :4; - unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ - /* transfers for slow buffer memory ??? */ - /* Also 32768 block size in some cases */ - __u16 max_speed; /* Maximum speed supported in KBps */ - __u8 reserved10, reserved11; - __u16 ctl; /* Continuous Transfer Limit in blocks */ - __u16 speed; /* Current Speed, in KBps */ - __u16 buffer_size; /* Buffer Size, in 512 bytes */ - __u8 reserved18, reserved19; -} idetape_capabilities_page_t; - -/* - * Block Size Page - */ -typedef struct { - unsigned page_code :6; /* Page code - Should be 0x30 */ - unsigned reserved1_6 :1; - unsigned ps :1; - __u8 page_length; /* Page Length - Should be 2 */ - __u8 reserved2; - unsigned play32 :1; - unsigned play32_5 :1; - unsigned reserved2_23 :2; - unsigned record32 :1; - unsigned record32_5 :1; - unsigned reserved2_6 :1; - unsigned one :1; -} idetape_block_size_page_t; +/* Tape door status */ +#define DOOR_UNLOCKED 0 +#define DOOR_LOCKED 1 +#define DOOR_EXPLICITLY_LOCKED 2 -/* - * A pipeline stage. - */ -typedef struct idetape_stage_s { - struct request rq; /* The corresponding request */ - struct idetape_bh *bh; /* The data buffers */ - struct idetape_stage_s *next; /* Pointer to the next stage */ -} idetape_stage_t; +/* Some defines for the SPACE command */ +#define IDETAPE_SPACE_OVER_FILEMARK 1 +#define IDETAPE_SPACE_TO_EOD 3 -/* - * REQUEST SENSE packet command result - Data Format. - */ -typedef struct { - unsigned error_code :7; /* Current of deferred errors */ - unsigned valid :1; /* The information field conforms to QIC-157C */ - __u8 reserved1 :8; /* Segment Number - Reserved */ - unsigned sense_key :4; /* Sense Key */ - unsigned reserved2_4 :1; /* Reserved */ - unsigned ili :1; /* Incorrect Length Indicator */ - unsigned eom :1; /* End Of Medium */ - unsigned filemark :1; /* Filemark */ - __u32 information __attribute__ ((packed)); - __u8 asl; /* Additional sense length (n-7) */ - __u32 command_specific; /* Additional command specific information */ - __u8 asc; /* Additional Sense Code */ - __u8 ascq; /* Additional Sense Code Qualifier */ - __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ - unsigned sk_specific1 :7; /* Sense Key Specific */ - unsigned sksv :1; /* Sense Key Specific information is valid */ - __u8 sk_specific2; /* Sense Key Specific */ - __u8 sk_specific3; /* Sense Key Specific */ - __u8 pad[2]; /* Padding to 20 bytes */ -} idetape_request_sense_result_t; +/* Some defines for the LOAD UNLOAD command */ +#define IDETAPE_LU_LOAD_MASK 1 +#define IDETAPE_LU_RETENSION_MASK 2 +#define IDETAPE_LU_EOT_MASK 4 +/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ +#define IDETAPE_BLOCK_DESCRIPTOR 0 +#define IDETAPE_CAPABILITIES_PAGE 0x2a /* - * Most of our global data which we need to save even as we leave the - * driver due to an interrupt or a timer event is stored in a variable - * of type idetape_tape_t, defined below. + * Most of our global data which we need to save even as we leave the driver due + * to an interrupt or a timer event is stored in the struct defined below. */ typedef struct ide_tape_obj { - ide_drive_t *drive; - ide_driver_t *driver; - struct gendisk *disk; - struct kref kref; + ide_drive_t *drive; + struct ide_driver *driver; + struct gendisk *disk; + struct device dev; - /* - * Since a typical character device operation requires more - * than one packet command, we provide here enough memory - * for the maximum of interconnected packet commands. - * The packet commands are stored in the circular array pc_stack. - * pc_stack_index points to the last used entry, and warps around - * to the start when we get to the last array entry. - * - * pc points to the current processed packet command. - * - * failed_pc points to the last failed packet command, or contains - * NULL if we do not need to retry any packet command. This is - * required since an additional packet command is needed before the - * retry, to get detailed information on what went wrong. - */ - /* Current packet command */ - idetape_pc_t *pc; - /* Last failed packet command */ - idetape_pc_t *failed_pc; - /* Packet command stack */ - idetape_pc_t pc_stack[IDETAPE_PC_STACK]; - /* Next free packet command storage space */ - int pc_stack_index; - struct request rq_stack[IDETAPE_PC_STACK]; - /* We implement a circular array */ - int rq_stack_index; + /* used by REQ_IDETAPE_{READ,WRITE} requests */ + struct ide_atapi_pc queued_pc; /* - * DSC polling variables. + * DSC polling variables. * - * While polling for DSC we use postponed_rq to postpone the - * current request so that ide.c will be able to service - * pending requests on the other device. Note that at most - * we will have only one DSC (usually data transfer) request - * in the device request queue. Additional requests can be - * queued in our internal pipeline, but they will be visible - * to ide.c only one at a time. + * While polling for DSC we use postponed_rq to postpone the current + * request so that ide.c will be able to service pending requests on the + * other device. Note that at most we will have only one DSC (usually + * data transfer) request in the device request queue. */ - struct request *postponed_rq; + bool postponed_rq; + /* The time in which we started polling for DSC */ unsigned long dsc_polling_start; /* Timer used to poll for dsc */ struct timer_list dsc_timer; /* Read/Write dsc polling frequency */ - unsigned long best_dsc_rw_frequency; - /* The current polling frequency */ - unsigned long dsc_polling_frequency; - /* Maximum waiting time */ + unsigned long best_dsc_rw_freq; + unsigned long dsc_poll_freq; unsigned long dsc_timeout; - /* - * Read position information - */ + /* Read position information */ u8 partition; /* Current block */ - unsigned int first_frame_position; - unsigned int last_frame_position; - unsigned int blocks_in_buffer; + unsigned int first_frame; - /* - * Last error information - */ + /* Last error information */ u8 sense_key, asc, ascq; - /* - * Character device operation - */ + /* Character device operation */ unsigned int minor; /* device name */ char name[4]; /* Current character device data transfer direction */ - idetape_chrdev_direction_t chrdev_direction; + u8 chrdev_dir; - /* - * Device information - */ - /* Usually 512 or 1024 bytes */ - unsigned short tape_block_size; + /* tape block size, usually 512 or 1024 bytes */ + unsigned short blk_size; int user_bs_factor; + /* Copy of the tape's Capabilities and Mechanical Page */ - idetape_capabilities_page_t capabilities; + u8 caps[20]; /* - * Active data transfer request parameters. - * - * At most, there is only one ide-tape originated data transfer - * request in the device request queue. This allows ide.c to - * easily service requests from the other device when we - * postpone our active request. In the pipelined operation - * mode, we use our internal pipeline structure to hold - * more data requests. - * - * The data buffer size is chosen based on the tape's - * recommendation. - */ - /* Pointer to the request which is waiting in the device request queue */ - struct request *active_data_request; - /* Data buffer size (chosen based on the tape's recommendation */ - int stage_size; - idetape_stage_t *merge_stage; - int merge_stage_size; - struct idetape_bh *bh; - char *b_data; - int b_count; - - /* - * Pipeline parameters. + * Active data transfer request parameters. * - * To accomplish non-pipelined mode, we simply set the following - * variables to zero (or NULL, where appropriate). + * At most, there is only one ide-tape originated data transfer request + * in the device request queue. This allows ide.c to easily service + * requests from the other device when we postpone our active request. */ - /* Number of currently used stages */ - int nr_stages; - /* Number of pending stages */ - int nr_pending_stages; - /* We will not allocate more than this number of stages */ - int max_stages, min_pipeline, max_pipeline; - /* The first stage which will be removed from the pipeline */ - idetape_stage_t *first_stage; - /* The currently active stage */ - idetape_stage_t *active_stage; - /* Will be serviced after the currently active request */ - idetape_stage_t *next_stage; - /* New requests will be added to the pipeline here */ - idetape_stage_t *last_stage; - /* Optional free stage which we can use */ - idetape_stage_t *cache_stage; - int pages_per_stage; - /* Wasted space in each stage */ - int excess_bh_size; - - /* Status/Action flags: long for set_bit */ - unsigned long flags; - /* protects the ide-tape queue */ - spinlock_t spinlock; - /* - * Measures average tape speed - */ + /* Data buffer size chosen based on the tape's recommendation */ + int buffer_size; + /* Staging buffer of buffer_size bytes */ + void *buf; + /* The read/write cursor */ + void *cur; + /* The number of valid bytes in buf */ + size_t valid; + + /* Measures average tape speed */ unsigned long avg_time; int avg_size; int avg_speed; - /* last sense information */ - idetape_request_sense_result_t sense; - - char vendor_id[10]; - char product_id[18]; - char firmware_revision[6]; - int firmware_revision_num; - /* the door is currently locked */ int door_locked; /* the tape hardware is write protected */ char drv_write_prot; /* the tape is write protected (hardware or opened as read-only) */ char write_prot; - - /* - * Limit the number of times a request can - * be postponed, to avoid an infinite postpone - * deadlock. - */ - /* request postpone count limit */ - int postpone_cnt; - - /* - * Measures number of frames: - * - * 1. written/read to/from the driver pipeline (pipeline_head). - * 2. written/read to/from the tape buffers (idetape_bh). - * 3. written/read by the tape to/from the media (tape_head). - */ - int pipeline_head; - int buffer_head; - int tape_head; - int last_tape_head; - - /* - * Speed control at the tape buffers input/output - */ - unsigned long insert_time; - int insert_size; - int insert_speed; - int max_insert_speed; - int measure_insert_time; - - /* - * Measure tape still time, in milliseconds - */ - unsigned long tape_still_time_begin; - int tape_still_time; - - /* - * Speed regulation negative feedback loop - */ - int speed_control; - int pipeline_head_speed; - int controlled_pipeline_head_speed; - int uncontrolled_pipeline_head_speed; - int controlled_last_pipeline_head; - int uncontrolled_last_pipeline_head; - unsigned long uncontrolled_pipeline_head_time; - unsigned long controlled_pipeline_head_time; - int controlled_previous_pipeline_head; - int uncontrolled_previous_pipeline_head; - unsigned long controlled_previous_head_time; - unsigned long uncontrolled_previous_head_time; - int restart_speed_control_req; - - /* - * Debug_level determines amount of debugging output; - * can be changed using /proc/ide/hdx/settings - * 0 : almost no debugging output - * 1 : 0+output errors only - * 2 : 1+output all sensekey/asc - * 3 : 2+follow all chrdev related procedures - * 4 : 3+follow all procedures - * 5 : 4+include pc_stack rq_stack info - * 6 : 5+USE_COUNT updates - */ - int debug_level; } idetape_tape_t; -static DECLARE_MUTEX(idetape_ref_sem); +static DEFINE_MUTEX(ide_tape_mutex); +static DEFINE_MUTEX(idetape_ref_mutex); -static struct class *idetape_sysfs_class; +static DEFINE_MUTEX(idetape_chrdev_mutex); -#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) - -#define ide_tape_g(disk) \ - container_of((disk)->private_data, struct ide_tape_obj, driver) - -static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) -{ - struct ide_tape_obj *tape = NULL; - - down(&idetape_ref_sem); - tape = ide_tape_g(disk); - if (tape) - kref_get(&tape->kref); - up(&idetape_ref_sem); - return tape; -} - -static void ide_tape_release(struct kref *); - -static void ide_tape_put(struct ide_tape_obj *tape) -{ - down(&idetape_ref_sem); - kref_put(&tape->kref, ide_tape_release); - up(&idetape_ref_sem); -} - -/* - * Tape door status - */ -#define DOOR_UNLOCKED 0 -#define DOOR_LOCKED 1 -#define DOOR_EXPLICITLY_LOCKED 2 - -/* - * Tape flag bits values. - */ -#define IDETAPE_IGNORE_DSC 0 -#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ -#define IDETAPE_BUSY 2 /* Device already opened */ -#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ -#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ -#define IDETAPE_FILEMARK 5 /* Currently on a filemark */ -#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ -#define IDETAPE_READ_ERROR 7 -#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ -/* 0 = no tape is loaded, so we don't rewind after ejecting */ -#define IDETAPE_MEDIUM_PRESENT 9 - -/* - * Supported ATAPI tape drives packet commands - */ -#define IDETAPE_TEST_UNIT_READY_CMD 0x00 -#define IDETAPE_REWIND_CMD 0x01 -#define IDETAPE_REQUEST_SENSE_CMD 0x03 -#define IDETAPE_READ_CMD 0x08 -#define IDETAPE_WRITE_CMD 0x0a -#define IDETAPE_WRITE_FILEMARK_CMD 0x10 -#define IDETAPE_SPACE_CMD 0x11 -#define IDETAPE_INQUIRY_CMD 0x12 -#define IDETAPE_ERASE_CMD 0x19 -#define IDETAPE_MODE_SENSE_CMD 0x1a -#define IDETAPE_MODE_SELECT_CMD 0x15 -#define IDETAPE_LOAD_UNLOAD_CMD 0x1b -#define IDETAPE_PREVENT_CMD 0x1e -#define IDETAPE_LOCATE_CMD 0x2b -#define IDETAPE_READ_POSITION_CMD 0x34 -#define IDETAPE_READ_BUFFER_CMD 0x3c -#define IDETAPE_SET_SPEED_CMD 0xbb - -/* - * Some defines for the READ BUFFER command - */ -#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 - -/* - * Some defines for the SPACE command - */ -#define IDETAPE_SPACE_OVER_FILEMARK 1 -#define IDETAPE_SPACE_TO_EOD 3 - -/* - * Some defines for the LOAD UNLOAD command - */ -#define IDETAPE_LU_LOAD_MASK 1 -#define IDETAPE_LU_RETENSION_MASK 2 -#define IDETAPE_LU_EOT_MASK 4 - -/* - * Special requests for our block device strategy routine. - * - * In order to service a character device command, we add special - * requests to the tail of our block device request queue and wait - * for their completion. - */ - -enum { - REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ - REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ - REQ_IDETAPE_READ = (1 << 2), - REQ_IDETAPE_WRITE = (1 << 3), - REQ_IDETAPE_READ_BUFFER = (1 << 4), -}; - -/* - * Error codes which are returned in rq->errors to the higher part - * of the driver. - */ -#define IDETAPE_ERROR_GENERAL 101 -#define IDETAPE_ERROR_FILEMARK 102 -#define IDETAPE_ERROR_EOD 103 - -/* - * The following is used to format the general configuration word of - * the ATAPI IDENTIFY DEVICE command. - */ -struct idetape_id_gcw { - unsigned packet_size :2; /* Packet Size */ - unsigned reserved234 :3; /* Reserved */ - unsigned drq_type :2; /* Command packet DRQ type */ - unsigned removable :1; /* Removable media */ - unsigned device_type :5; /* Device type */ - unsigned reserved13 :1; /* Reserved */ - unsigned protocol :2; /* Protocol type */ -}; - -/* - * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) - */ -typedef struct { - unsigned device_type :5; /* Peripheral Device Type */ - unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ - unsigned reserved1_6t0 :7; /* Reserved */ - unsigned rmb :1; /* Removable Medium Bit */ - unsigned ansi_version :3; /* ANSI Version */ - unsigned ecma_version :3; /* ECMA Version */ - unsigned iso_version :2; /* ISO Version */ - unsigned response_format :4; /* Response Data Format */ - unsigned reserved3_45 :2; /* Reserved */ - unsigned reserved3_6 :1; /* TrmIOP - Reserved */ - unsigned reserved3_7 :1; /* AENC - Reserved */ - __u8 additional_length; /* Additional Length (total_length-4) */ - __u8 rsv5, rsv6, rsv7; /* Reserved */ - __u8 vendor_id[8]; /* Vendor Identification */ - __u8 product_id[16]; /* Product Identification */ - __u8 revision_level[4]; /* Revision Level */ - __u8 vendor_specific[20]; /* Vendor Specific - Optional */ - __u8 reserved56t95[40]; /* Reserved - Optional */ - /* Additional information may be returned */ -} idetape_inquiry_result_t; - -/* - * READ POSITION packet command - Data Format (From Table 6-57) - */ -typedef struct { - unsigned reserved0_10 :2; /* Reserved */ - unsigned bpu :1; /* Block Position Unknown */ - unsigned reserved0_543 :3; /* Reserved */ - unsigned eop :1; /* End Of Partition */ - unsigned bop :1; /* Beginning Of Partition */ - u8 partition; /* Partition Number */ - u8 reserved2, reserved3; /* Reserved */ - u32 first_block; /* First Block Location */ - u32 last_block; /* Last Block Location (Optional) */ - u8 reserved12; /* Reserved */ - u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ - u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ -} idetape_read_position_result_t; - -/* - * Follows structures which are related to the SELECT SENSE / MODE SENSE - * packet commands. Those packet commands are still not supported - * by ide-tape. - */ -#define IDETAPE_BLOCK_DESCRIPTOR 0 -#define IDETAPE_CAPABILITIES_PAGE 0x2a -#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ -#define IDETAPE_BLOCK_SIZE_PAGE 0x30 -#define IDETAPE_BUFFER_FILLING_PAGE 0x33 - -/* - * Mode Parameter Header for the MODE SENSE packet command - */ -typedef struct { - __u8 mode_data_length; /* Length of the following data transfer */ - __u8 medium_type; /* Medium Type */ - __u8 dsp; /* Device Specific Parameter */ - __u8 bdl; /* Block Descriptor Length */ -#if 0 - /* data transfer page */ - __u8 page_code :6; - __u8 reserved0_6 :1; - __u8 ps :1; /* parameters saveable */ - __u8 page_length; /* page Length == 0x02 */ - __u8 reserved2; - __u8 read32k :1; /* 32k blk size (data only) */ - __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */ - __u8 reserved3_23 :2; - __u8 write32k :1; /* 32k blk size (data only) */ - __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */ - __u8 reserved3_6 :1; - __u8 streaming :1; /* streaming mode enable */ -#endif -} idetape_mode_parameter_header_t; - -/* - * Mode Parameter Block Descriptor the MODE SENSE packet command - * - * Support for block descriptors is optional. - */ -typedef struct { - __u8 density_code; /* Medium density code */ - __u8 blocks[3]; /* Number of blocks */ - __u8 reserved4; /* Reserved */ - __u8 length[3]; /* Block Length */ -} idetape_parameter_block_descriptor_t; - -/* - * The Data Compression Page, as returned by the MODE SENSE packet command. - */ -typedef struct { - unsigned page_code :6; /* Page Code - Should be 0xf */ - unsigned reserved0 :1; /* Reserved */ - unsigned ps :1; - __u8 page_length; /* Page Length - Should be 14 */ - unsigned reserved2 :6; /* Reserved */ - unsigned dcc :1; /* Data Compression Capable */ - unsigned dce :1; /* Data Compression Enable */ - unsigned reserved3 :5; /* Reserved */ - unsigned red :2; /* Report Exception on Decompression */ - unsigned dde :1; /* Data Decompression Enable */ - __u32 ca; /* Compression Algorithm */ - __u32 da; /* Decompression Algorithm */ - __u8 reserved[4]; /* Reserved */ -} idetape_data_compression_page_t; - -/* - * The Medium Partition Page, as returned by the MODE SENSE packet command. - */ -typedef struct { - unsigned page_code :6; /* Page Code - Should be 0x11 */ - unsigned reserved1_6 :1; /* Reserved */ - unsigned ps :1; - __u8 page_length; /* Page Length - Should be 6 */ - __u8 map; /* Maximum Additional Partitions - Should be 0 */ - __u8 apd; /* Additional Partitions Defined - Should be 0 */ - unsigned reserved4_012 :3; /* Reserved */ - unsigned psum :2; /* Should be 0 */ - unsigned idp :1; /* Should be 0 */ - unsigned sdp :1; /* Should be 0 */ - unsigned fdp :1; /* Fixed Data Partitions */ - __u8 mfr; /* Medium Format Recognition */ - __u8 reserved[2]; /* Reserved */ -} idetape_medium_partition_page_t; - -/* - * Run time configurable parameters. - */ -typedef struct { - int dsc_rw_frequency; - int dsc_media_access_frequency; - int nr_stages; -} idetape_config_t; +static struct class *idetape_sysfs_class; -/* - * The variables below are used for the character device interface. - * Additional state variables are defined in our ide_drive_t structure. - */ -static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; +static void ide_tape_release(struct device *); -#define ide_tape_f(file) ((file)->private_data) +static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; -static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) +static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, + unsigned int i) { struct ide_tape_obj *tape = NULL; - down(&idetape_ref_sem); - tape = idetape_devs[i]; - if (tape) - kref_get(&tape->kref); - up(&idetape_ref_sem); - return tape; -} - -/* - * Function declarations - * - */ -static int idetape_chrdev_release (struct inode *inode, struct file *filp); -static void idetape_write_release (ide_drive_t *drive, unsigned int minor); - -/* - * Too bad. The drive wants to send us data which we are not ready to accept. - * Just throw it away. - */ -static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) -{ - while (bcount--) - (void) HWIF(drive)->INB(IDE_DATA_REG); -} + mutex_lock(&idetape_ref_mutex); -static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) -{ - struct idetape_bh *bh = pc->bh; - int count; - - while (bcount) { -#if IDETAPE_DEBUG_BUGS - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_input_buffers\n"); - idetape_discard_data(drive, bcount); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); - HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); - bcount -= count; - atomic_add(count, &bh->b_count); - if (atomic_read(&bh->b_count) == bh->b_size) { - bh = bh->b_reqnext; - if (bh) - atomic_set(&bh->b_count, 0); - } - } - pc->bh = bh; -} - -static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) -{ - struct idetape_bh *bh = pc->bh; - int count; + if (cdev) + tape = idetape_devs[i]; + else + tape = ide_drv_g(disk, ide_tape_obj); - while (bcount) { -#if IDETAPE_DEBUG_BUGS - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_output_buffers\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - count = min((unsigned int)pc->b_count, (unsigned int)bcount); - HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); - bcount -= count; - pc->b_data += count; - pc->b_count -= count; - if (!pc->b_count) { - pc->bh = bh = bh->b_reqnext; - if (bh) { - pc->b_data = bh->b_data; - pc->b_count = atomic_read(&bh->b_count); - } - } + if (tape) { + if (ide_device_get(tape->drive)) + tape = NULL; + else + get_device(&tape->dev); } -} -static void idetape_update_buffers (idetape_pc_t *pc) -{ - struct idetape_bh *bh = pc->bh; - int count; - unsigned int bcount = pc->actually_transferred; - - if (test_bit(PC_WRITING, &pc->flags)) - return; - while (bcount) { -#if IDETAPE_DEBUG_BUGS - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_update_buffers\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - count = min((unsigned int)bh->b_size, (unsigned int)bcount); - atomic_set(&bh->b_count, count); - if (atomic_read(&bh->b_count) == bh->b_size) - bh = bh->b_reqnext; - bcount -= count; - } - pc->bh = bh; + mutex_unlock(&idetape_ref_mutex); + return tape; } -/* - * idetape_next_pc_storage returns a pointer to a place in which we can - * safely store a packet command, even though we intend to leave the - * driver. A storage space for a maximum of IDETAPE_PC_STACK packet - * commands is allocated at initialization time. - */ -static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) +static void ide_tape_put(struct ide_tape_obj *tape) { - idetape_tape_t *tape = drive->driver_data; + ide_drive_t *drive = tape->drive; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 5) - printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", - tape->pc_stack_index); -#endif /* IDETAPE_DEBUG_LOG */ - if (tape->pc_stack_index == IDETAPE_PC_STACK) - tape->pc_stack_index=0; - return (&tape->pc_stack[tape->pc_stack_index++]); + mutex_lock(&idetape_ref_mutex); + put_device(&tape->dev); + ide_device_put(drive); + mutex_unlock(&idetape_ref_mutex); } /* - * idetape_next_rq_storage is used along with idetape_next_pc_storage. - * Since we queue packet commands in the request queue, we need to - * allocate a request, along with the allocation of a packet command. + * called on each failed packet command retry to analyze the request sense. We + * currently do not utilize this information. */ - -/************************************************************** - * * - * This should get fixed to use kmalloc(.., GFP_ATOMIC) * - * followed later on by kfree(). -ml * - * * - **************************************************************/ - -static struct request *idetape_next_rq_storage (ide_drive_t *drive) +static void idetape_analyze_error(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; + struct ide_atapi_pc *pc = drive->failed_pc; + struct request *rq = drive->hwif->rq; + u8 *sense = bio_data(rq->bio); -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 5) - printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", - tape->rq_stack_index); -#endif /* IDETAPE_DEBUG_LOG */ - if (tape->rq_stack_index == IDETAPE_PC_STACK) - tape->rq_stack_index=0; - return (&tape->rq_stack[tape->rq_stack_index++]); -} - -/* - * idetape_init_pc initializes a packet command. - */ -static void idetape_init_pc (idetape_pc_t *pc) -{ - memset(pc->c, 0, 12); - pc->retries = 0; - pc->flags = 0; - pc->request_transfer = 0; - pc->buffer = pc->pc_buffer; - pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; - pc->bh = NULL; - pc->b_data = NULL; -} + tape->sense_key = sense[2] & 0xF; + tape->asc = sense[12]; + tape->ascq = sense[13]; -/* - * idetape_analyze_error is called on each failed packet command retry - * to analyze the request sense. We currently do not utilize this - * information. - */ -static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_pc_t *pc = tape->failed_pc; + ide_debug_log(IDE_DBG_FUNC, + "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x", + rq->cmd[0], tape->sense_key, tape->asc, tape->ascq); - tape->sense = *result; - tape->sense_key = result->sense_key; - tape->asc = result->asc; - tape->ascq = result->ascq; -#if IDETAPE_DEBUG_LOG - /* - * Without debugging, we only log an error if we decided to - * give up retrying. - */ - if (tape->debug_level >= 1) - printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " - "asc = %x, ascq = %x\n", - pc->c[0], result->sense_key, - result->asc, result->ascq); -#endif /* IDETAPE_DEBUG_LOG */ - - /* - * Correct pc->actually_transferred by asking the tape. - */ - if (test_bit(PC_DMA_ERROR, &pc->flags)) { - pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information)); - idetape_update_buffers(pc); - } + /* correct remaining bytes to transfer */ + if (pc->flags & PC_FLAG_DMA_ERROR) + rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); /* * If error was the result of a zero-length read or write command, * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. */ - if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) - && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */ - if (result->sense_key == 5) { + if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) + /* length == 0 */ + && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { + if (tape->sense_key == 5) { /* don't report an error, everything's ok */ pc->error = 0; /* don't retry read/write */ - set_bit(PC_ABORT, &pc->flags); + pc->flags |= PC_FLAG_ABORT; } } - if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { - pc->error = IDETAPE_ERROR_FILEMARK; - set_bit(PC_ABORT, &pc->flags); + if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { + pc->error = IDE_DRV_ERROR_FILEMARK; + pc->flags |= PC_FLAG_ABORT; } - if (pc->c[0] == IDETAPE_WRITE_CMD) { - if (result->eom || - (result->sense_key == 0xd && result->asc == 0x0 && - result->ascq == 0x2)) { - pc->error = IDETAPE_ERROR_EOD; - set_bit(PC_ABORT, &pc->flags); + if (pc->c[0] == WRITE_6) { + if ((sense[2] & 0x40) || (tape->sense_key == 0xd + && tape->asc == 0x0 && tape->ascq == 0x2)) { + pc->error = IDE_DRV_ERROR_EOD; + pc->flags |= PC_FLAG_ABORT; } } - if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { - if (result->sense_key == 8) { - pc->error = IDETAPE_ERROR_EOD; - set_bit(PC_ABORT, &pc->flags); + if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { + if (tape->sense_key == 8) { + pc->error = IDE_DRV_ERROR_EOD; + pc->flags |= PC_FLAG_ABORT; } - if (!test_bit(PC_ABORT, &pc->flags) && - pc->actually_transferred) + if (!(pc->flags & PC_FLAG_ABORT) && + (blk_rq_bytes(rq) - rq->resid_len)) pc->retries = IDETAPE_MAX_PC_RETRIES + 1; } } -/* - * idetape_active_next_stage will declare the next stage as "active". - */ -static void idetape_active_next_stage (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_stage_t *stage = tape->next_stage; - struct request *rq = &stage->rq; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); -#endif /* IDETAPE_DEBUG_LOG */ -#if IDETAPE_DEBUG_BUGS - if (stage == NULL) { - printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ +static void ide_tape_handle_dsc(ide_drive_t *); - rq->rq_disk = tape->disk; - rq->buffer = NULL; - rq->special = (void *)stage->bh; - tape->active_data_request = rq; - tape->active_stage = stage; - tape->next_stage = stage->next; -} - -/* - * idetape_increase_max_pipeline_stages is a part of the feedback - * loop which tries to find the optimum number of stages. In the - * feedback loop, we are starting from a minimum maximum number of - * stages, and if we sense that the pipeline is empty, we try to - * increase it, until we reach the user compile time memory limit. - */ -static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) +static int ide_tape_callback(ide_drive_t *drive, int dsc) { idetape_tape_t *tape = drive->driver_data; - int increase = (tape->max_pipeline - tape->min_pipeline) / 10; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); -#endif /* IDETAPE_DEBUG_LOG */ - - tape->max_stages += max(increase, 1); - tape->max_stages = max(tape->max_stages, tape->min_pipeline); - tape->max_stages = min(tape->max_stages, tape->max_pipeline); -} + struct ide_atapi_pc *pc = drive->pc; + struct request *rq = drive->hwif->rq; + int uptodate = pc->error ? 0 : 1; + int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; -/* - * idetape_kfree_stage calls kfree to completely free a stage, along with - * its related buffers. - */ -static void __idetape_kfree_stage (idetape_stage_t *stage) -{ - struct idetape_bh *prev_bh, *bh = stage->bh; - int size; - - while (bh != NULL) { - if (bh->b_data != NULL) { - size = (int) bh->b_size; - while (size > 0) { - free_page((unsigned long) bh->b_data); - size -= PAGE_SIZE; - bh->b_data += PAGE_SIZE; - } - } - prev_bh = bh; - bh = bh->b_reqnext; - kfree(prev_bh); - } - kfree(stage); -} + ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0], + dsc, err); -static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) -{ - __idetape_kfree_stage(stage); -} + if (dsc) + ide_tape_handle_dsc(drive); -/* - * idetape_remove_stage_head removes tape->first_stage from the pipeline. - * The caller should avoid race conditions. - */ -static void idetape_remove_stage_head (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_stage_t *stage; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); -#endif /* IDETAPE_DEBUG_LOG */ -#if IDETAPE_DEBUG_BUGS - if (tape->first_stage == NULL) { - printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); - return; - } - if (tape->active_stage == tape->first_stage) { - printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - stage = tape->first_stage; - tape->first_stage = stage->next; - idetape_kfree_stage(tape, stage); - tape->nr_stages--; - if (tape->first_stage == NULL) { - tape->last_stage = NULL; -#if IDETAPE_DEBUG_BUGS - if (tape->next_stage != NULL) - printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); - if (tape->nr_stages) - printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); -#endif /* IDETAPE_DEBUG_BUGS */ - } -} - -/* - * This will free all the pipeline stages starting from new_last_stage->next - * to the end of the list, and point tape->last_stage to new_last_stage. - */ -static void idetape_abort_pipeline(ide_drive_t *drive, - idetape_stage_t *new_last_stage) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_stage_t *stage = new_last_stage->next; - idetape_stage_t *nstage; + if (drive->failed_pc == pc) + drive->failed_pc = NULL; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); -#endif - while (stage) { - nstage = stage->next; - idetape_kfree_stage(tape, stage); - --tape->nr_stages; - --tape->nr_pending_stages; - stage = nstage; - } - if (new_last_stage) - new_last_stage->next = NULL; - tape->last_stage = new_last_stage; - tape->next_stage = NULL; -} - -/* - * idetape_end_request is used to finish servicing a request, and to - * insert a pending pipeline request into the main device queue. - */ -static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) -{ - struct request *rq = HWGROUP(drive)->rq; - idetape_tape_t *tape = drive->driver_data; - unsigned long flags; - int error; - int remove_stage = 0; - idetape_stage_t *active_stage; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); -#endif /* IDETAPE_DEBUG_LOG */ - - switch (uptodate) { - case 0: error = IDETAPE_ERROR_GENERAL; break; - case 1: error = 0; break; - default: error = uptodate; - } - rq->errors = error; - if (error) - tape->failed_pc = NULL; - - spin_lock_irqsave(&tape->spinlock, flags); - - /* The request was a pipelined data transfer request */ - if (tape->active_data_request == rq) { - active_stage = tape->active_stage; - tape->active_stage = NULL; - tape->active_data_request = NULL; - tape->nr_pending_stages--; - if (rq->cmd[0] & REQ_IDETAPE_WRITE) { - remove_stage = 1; - if (error) { - set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); - if (error == IDETAPE_ERROR_EOD) - idetape_abort_pipeline(drive, active_stage); - } - } else if (rq->cmd[0] & REQ_IDETAPE_READ) { - if (error == IDETAPE_ERROR_EOD) { - set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); - idetape_abort_pipeline(drive, active_stage); - } - } - if (tape->next_stage != NULL) { - idetape_active_next_stage(drive); - - /* - * Insert the next request into the request queue. - */ - (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); - } else if (!error) { - idetape_increase_max_pipeline_stages(drive); + if (pc->c[0] == REQUEST_SENSE) { + if (uptodate) + idetape_analyze_error(drive); + else + printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " + "itself - Aborting request!\n"); + } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { + unsigned int blocks = + (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; + + tape->avg_size += blocks * tape->blk_size; + + if (time_after_eq(jiffies, tape->avg_time + HZ)) { + tape->avg_speed = tape->avg_size * HZ / + (jiffies - tape->avg_time) / 1024; + tape->avg_size = 0; + tape->avg_time = jiffies; } - } - ide_end_drive_cmd(drive, 0, 0); -// blkdev_dequeue_request(rq); -// drive->rq = NULL; -// end_that_request_last(rq); - - if (remove_stage) - idetape_remove_stage_head(drive); - if (tape->active_data_request == NULL) - clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); - spin_unlock_irqrestore(&tape->spinlock, flags); - return 0; -} -static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; + tape->first_frame += blocks; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); -#endif /* IDETAPE_DEBUG_LOG */ - if (!tape->pc->error) { - idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer); - idetape_end_request(drive, 1, 0); - } else { - printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); - idetape_end_request(drive, 0, 0); + if (pc->error) { + uptodate = 0; + err = pc->error; + } } - return ide_stopped; -} + rq->errors = err; -static void idetape_create_request_sense_cmd (idetape_pc_t *pc) -{ - idetape_init_pc(pc); - pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; - pc->c[4] = 20; - pc->request_transfer = 20; - pc->callback = &idetape_request_sense_callback; -} - -static void idetape_init_rq(struct request *rq, u8 cmd) -{ - memset(rq, 0, sizeof(*rq)); - rq->flags = REQ_SPECIAL; - rq->cmd[0] = cmd; + return uptodate; } /* - * idetape_queue_pc_head generates a new packet command request in front - * of the request queue, before the current request, so that it will be - * processed immediately, on the next pass through the driver. - * - * idetape_queue_pc_head is called from the request handling part of - * the driver (the "bottom" part). Safe storage for the request should - * be allocated with idetape_next_pc_storage and idetape_next_rq_storage - * before calling idetape_queue_pc_head. - * - * Memory for those requests is pre-allocated at initialization time, and - * is limited to IDETAPE_PC_STACK requests. We assume that we have enough - * space for the maximum possible number of inter-dependent packet commands. - * - * The higher level of the driver - The ioctl handler and the character - * device handling functions should queue request to the lower level part - * and wait for their completion using idetape_queue_pc_tail or - * idetape_queue_rw_tail. + * Postpone the current request so that ide.c will be able to service requests + * from another device on the same port while we are polling for DSC. */ -static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) -{ - struct ide_tape_obj *tape = drive->driver_data; - - idetape_init_rq(rq, REQ_IDETAPE_PC1); - rq->buffer = (char *) pc; - rq->rq_disk = tape->disk; - (void) ide_do_drive_cmd(drive, rq, ide_preempt); -} - -/* - * idetape_retry_pc is called when an error was detected during the - * last packet command. We queue a request sense packet command in - * the head of the request list. - */ -static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) +static void ide_tape_stall_queue(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - idetape_pc_t *pc; - struct request *rq; - atapi_error_t error; - - error.all = HWIF(drive)->INB(IDE_ERROR_REG); - pc = idetape_next_pc_storage(drive); - rq = idetape_next_rq_storage(drive); - idetape_create_request_sense_cmd(pc); - set_bit(IDETAPE_IGNORE_DSC, &tape->flags); - idetape_queue_pc_head(drive, pc, rq); - return ide_stopped; -} -/* - * idetape_postpone_request postpones the current request so that - * ide.c will be able to service requests from another device on - * the same hwgroup while we are polling for DSC. - */ -static void idetape_postpone_request (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; + ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu", + drive->hwif->rq->cmd[0], tape->dsc_poll_freq); -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); -#endif - tape->postponed_rq = HWGROUP(drive)->rq; - ide_stall_queue(drive, tape->dsc_polling_frequency); + tape->postponed_rq = true; + + ide_stall_queue(drive, tape->dsc_poll_freq); } -/* - * idetape_pc_intr is the usual interrupt handler which will be called - * during a packet command. We will transfer some of the data (as - * requested by the drive) and will re-point interrupt handler to us. - * When data transfer is finished, we will act according to the - * algorithm described before idetape_issue_packet_command. - * - */ -static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) +static void ide_tape_handle_dsc(ide_drive_t *drive) { - ide_hwif_t *hwif = drive->hwif; idetape_tape_t *tape = drive->driver_data; - atapi_status_t status; - atapi_bcount_t bcount; - atapi_ireason_t ireason; - idetape_pc_t *pc = tape->pc; - - unsigned int temp; -#if SIMULATE_ERRORS - static int error_sim_count = 0; -#endif - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " - "interrupt handler\n"); -#endif /* IDETAPE_DEBUG_LOG */ - - /* Clear the interrupt */ - status.all = HWIF(drive)->INB(IDE_STATUS_REG); - - if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { - if (HWIF(drive)->ide_dma_end(drive) || status.b.check) { - /* - * A DMA error is sometimes expected. For example, - * if the tape is crossing a filemark during a - * READ command, it will issue an irq and position - * itself before the filemark, so that only a partial - * data transfer will occur (which causes the DMA - * error). In that case, we will later ask the tape - * how much bytes of the original request were - * actually transferred (we can't receive that - * information from the DMA engine on most chipsets). - */ - - /* - * On the contrary, a DMA error is never expected; - * it usually indicates a hardware error or abort. - * If the tape crosses a filemark during a READ - * command, it will issue an irq and position itself - * after the filemark (not before). Only a partial - * data transfer will occur, but no DMA error. - * (AS, 19 Apr 2001) - */ - set_bit(PC_DMA_ERROR, &pc->flags); - } else { - pc->actually_transferred = pc->request_transfer; - idetape_update_buffers(pc); - } -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: DMA finished\n"); -#endif /* IDETAPE_DEBUG_LOG */ - } - - /* No more interrupts */ - if (!status.b.drq) { -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); -#endif /* IDETAPE_DEBUG_LOG */ - clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); - - local_irq_enable(); - -#if SIMULATE_ERRORS - if ((pc->c[0] == IDETAPE_WRITE_CMD || - pc->c[0] == IDETAPE_READ_CMD) && - (++error_sim_count % 100) == 0) { - printk(KERN_INFO "ide-tape: %s: simulating error\n", - tape->name); - status.b.check = 1; - } -#endif - if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) - status.b.check = 0; - if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) { /* Error detected */ -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 1) - printk(KERN_INFO "ide-tape: %s: I/O error\n", - tape->name); -#endif /* IDETAPE_DEBUG_LOG */ - if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { - printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); - return ide_do_reset(drive); - } -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 1) - printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); -#endif - /* Retry operation */ - return idetape_retry_pc(drive); - } - pc->error = 0; - if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && - !status.b.dsc) { - /* Media access command */ - tape->dsc_polling_start = jiffies; - tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; - tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; - /* Allow ide.c to handle other requests */ - idetape_postpone_request(drive); - return ide_stopped; - } - if (tape->failed_pc == pc) - tape->failed_pc = NULL; - /* Command finished - Call the callback function */ - return pc->callback(drive); - } - if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { - printk(KERN_ERR "ide-tape: The tape wants to issue more " - "interrupts in DMA mode\n"); - printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); - (void)__ide_dma_off(drive); - return ide_do_reset(drive); - } - /* Get the number of bytes to transfer on this interrupt. */ - bcount.b.high = hwif->INB(IDE_BCOUNTH_REG); - bcount.b.low = hwif->INB(IDE_BCOUNTL_REG); - - ireason.all = hwif->INB(IDE_IREASON_REG); - if (ireason.b.cod) { - printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); - return ide_do_reset(drive); - } - if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) { - /* Hopefully, we will never get here */ - printk(KERN_ERR "ide-tape: We wanted to %s, ", - ireason.b.io ? "Write":"Read"); - printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", - ireason.b.io ? "Read":"Write"); - return ide_do_reset(drive); - } - if (!test_bit(PC_WRITING, &pc->flags)) { - /* Reading - Check that we have enough space */ - temp = pc->actually_transferred + bcount.all; - if (temp > pc->request_transfer) { - if (temp > pc->buffer_size) { - printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); - idetape_discard_data(drive, bcount.all); - ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); - return ide_started; - } -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); -#endif /* IDETAPE_DEBUG_LOG */ - } - } - if (test_bit(PC_WRITING, &pc->flags)) { - if (pc->bh != NULL) - idetape_output_buffers(drive, pc, bcount.all); - else - /* Write the current buffer */ - HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all); - } else { - if (pc->bh != NULL) - idetape_input_buffers(drive, pc, bcount.all); - else - /* Read the current buffer */ - HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all); - } - /* Update the current position */ - pc->actually_transferred += bcount.all; - pc->current_position += bcount.all; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all); -#endif - /* And set the interrupt handler again */ - ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); - return ide_started; + /* Media access command */ + tape->dsc_polling_start = jiffies; + tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; + tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; + /* Allow ide.c to handle other requests */ + ide_tape_stall_queue(drive); } /* - * Packet Command Interface + * Packet Command Interface * - * The current Packet Command is available in tape->pc, and will not - * change until we finish handling it. Each packet command is associated - * with a callback function that will be called when the command is - * finished. + * The current Packet Command is available in drive->pc, and will not change + * until we finish handling it. Each packet command is associated with a + * callback function that will be called when the command is finished. * - * The handling will be done in three stages: + * The handling will be done in three stages: * - * 1. idetape_issue_packet_command will send the packet command to the - * drive, and will set the interrupt handler to idetape_pc_intr. + * 1. ide_tape_issue_pc will send the packet command to the drive, and will set + * the interrupt handler to ide_pc_intr. * - * 2. On each interrupt, idetape_pc_intr will be called. This step - * will be repeated until the device signals us that no more - * interrupts will be issued. + * 2. On each interrupt, ide_pc_intr will be called. This step will be + * repeated until the device signals us that no more interrupts will be issued. * - * 3. ATAPI Tape media access commands have immediate status with a - * delayed process. In case of a successful initiation of a - * media access packet command, the DSC bit will be set when the - * actual execution of the command is finished. - * Since the tape drive will not issue an interrupt, we have to - * poll for this event. In this case, we define the request as - * "low priority request" by setting rq_status to - * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit - * the driver. + * 3. ATAPI Tape media access commands have immediate status with a delayed + * process. In case of a successful initiation of a media access packet command, + * the DSC bit will be set when the actual execution of the command is finished. + * Since the tape drive will not issue an interrupt, we have to poll for this + * event. In this case, we define the request as "low priority request" by + * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and + * exit the driver. * - * ide.c will then give higher priority to requests which - * originate from the other device, until will change rq_status - * to RQ_ACTIVE. + * ide.c will then give higher priority to requests which originate from the + * other device, until will change rq_status to RQ_ACTIVE. * - * 4. When the packet command is finished, it will be checked for errors. + * 4. When the packet command is finished, it will be checked for errors. * - * 5. In case an error was found, we queue a request sense packet - * command in front of the request queue and retry the operation - * up to IDETAPE_MAX_PC_RETRIES times. - * - * 6. In case no error was found, or we decided to give up and not - * to retry again, the callback function will be called and then - * we will handle the next request. + * 5. In case an error was found, we queue a request sense packet command in + * front of the request queue and retry the operation up to + * IDETAPE_MAX_PC_RETRIES times. * + * 6. In case no error was found, or we decided to give up and not to retry + * again, the callback function will be called and then we will handle the next + * request. */ -static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) -{ - ide_hwif_t *hwif = drive->hwif; - idetape_tape_t *tape = drive->driver_data; - idetape_pc_t *pc = tape->pc; - atapi_ireason_t ireason; - int retries = 100; - ide_startstop_t startstop; - - if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { - printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); - return startstop; - } - ireason.all = hwif->INB(IDE_IREASON_REG); - while (retries-- && (!ireason.b.cod || ireason.b.io)) { - printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " - "a packet command, retrying\n"); - udelay(100); - ireason.all = hwif->INB(IDE_IREASON_REG); - if (retries == 0) { - printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " - "issuing a packet command, ignoring\n"); - ireason.b.cod = 1; - ireason.b.io = 0; - } - } - if (!ireason.b.cod || ireason.b.io) { - printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " - "a packet command\n"); - return ide_do_reset(drive); - } - /* Set the interrupt routine */ - ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); -#ifdef CONFIG_BLK_DEV_IDEDMA - /* Begin DMA, if necessary */ - if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) - hwif->dma_start(drive); -#endif - /* Send the actual packet */ - HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); - return ide_started; -} -static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) +static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, + struct ide_cmd *cmd, + struct ide_atapi_pc *pc) { - ide_hwif_t *hwif = drive->hwif; idetape_tape_t *tape = drive->driver_data; - atapi_bcount_t bcount; - int dma_ok = 0; - -#if IDETAPE_DEBUG_BUGS - if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && - pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { - printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " - "Two request sense in serial were issued\n"); - } -#endif /* IDETAPE_DEBUG_BUGS */ + struct request *rq = drive->hwif->rq; + + if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) + drive->failed_pc = pc; - if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) - tape->failed_pc = pc; /* Set the current packet command */ - tape->pc = pc; + drive->pc = pc; if (pc->retries > IDETAPE_MAX_PC_RETRIES || - test_bit(PC_ABORT, &pc->flags)) { + (pc->flags & PC_FLAG_ABORT)) { + /* - * We will "abort" retrying a packet command in case - * a legitimate error code was received (crossing a - * filemark, or end of the media, for example). + * We will "abort" retrying a packet command in case legitimate + * error code was received (crossing a filemark, or end of the + * media, for example). */ - if (!test_bit(PC_ABORT, &pc->flags)) { - if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && + if (!(pc->flags & PC_FLAG_ABORT)) { + if (!(pc->c[0] == TEST_UNIT_READY && tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) { printk(KERN_ERR "ide-tape: %s: I/O error, " @@ -2156,74 +469,30 @@ static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape tape->ascq); } /* Giving up */ - pc->error = IDETAPE_ERROR_GENERAL; + pc->error = IDE_DRV_ERROR_GENERAL; } - tape->failed_pc = NULL; - return pc->callback(drive); - } -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); -#endif /* IDETAPE_DEBUG_LOG */ - pc->retries++; - /* We haven't transferred any data yet */ - pc->actually_transferred = 0; - pc->current_position = pc->buffer; - /* Request to transfer the entire buffer at once */ - bcount.all = pc->request_transfer; - - if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { - printk(KERN_WARNING "ide-tape: DMA disabled, " - "reverting to PIO\n"); - (void)__ide_dma_off(drive); - } - if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) - dma_ok = !hwif->dma_setup(drive); - - if (IDE_CONTROL_REG) - hwif->OUTB(drive->ctl, IDE_CONTROL_REG); - hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */ - hwif->OUTB(bcount.b.high, IDE_BCOUNTH_REG); - hwif->OUTB(bcount.b.low, IDE_BCOUNTL_REG); - hwif->OUTB(drive->select.all, IDE_SELECT_REG); - if (dma_ok) /* Will begin DMA later */ - set_bit(PC_DMA_IN_PROGRESS, &pc->flags); - if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { - ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); - hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); - return ide_started; - } else { - hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); - return idetape_transfer_pc(drive); + drive->failed_pc = NULL; + drive->pc_callback(drive, 0); + ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); + return ide_stopped; } -} + ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries, + pc->c[0]); -/* - * General packet command callback function. - */ -static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); -#endif /* IDETAPE_DEBUG_LOG */ + pc->retries++; - idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); - return ide_stopped; + return ide_issue_pc(drive, cmd); } -/* - * A mode sense command is used to "sense" tape parameters. - */ -static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) +/* A mode sense command is used to "sense" tape parameters. */ +static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_MODE_SENSE_CMD; + ide_init_pc(pc); + pc->c[0] = MODE_SENSE; if (page_code != IDETAPE_BLOCK_DESCRIPTOR) - pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ + /* DBD = 1 - Don't return block descriptors */ + pc->c[1] = 8; pc->c[2] = page_code; /* * Changed pc->c[3] to 0 (255 will at best return unused info). @@ -2233,673 +502,200 @@ static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) * and return an error when 255 is used. */ pc->c[3] = 0; - pc->c[4] = 255; /* (We will just discard data in that case) */ + /* We will just discard data in that case */ + pc->c[4] = 255; if (page_code == IDETAPE_BLOCK_DESCRIPTOR) - pc->request_transfer = 12; + pc->req_xfer = 12; else if (page_code == IDETAPE_CAPABILITIES_PAGE) - pc->request_transfer = 24; + pc->req_xfer = 24; else - pc->request_transfer = 50; - pc->callback = &idetape_pc_callback; + pc->req_xfer = 50; } -static void calculate_speeds(ide_drive_t *drive) +static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) { + ide_hwif_t *hwif = drive->hwif; idetape_tape_t *tape = drive->driver_data; - int full = 125, empty = 75; + struct ide_atapi_pc *pc = drive->pc; + u8 stat; - if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { - tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; - tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; - tape->controlled_last_pipeline_head = tape->pipeline_head; - tape->controlled_pipeline_head_time = jiffies; - } - if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) - tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); - else if (time_after(jiffies, tape->controlled_previous_head_time)) - tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); - - if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { - /* -1 for read mode error recovery */ - if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { - tape->uncontrolled_pipeline_head_time = jiffies; - tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); - } - } else { - tape->uncontrolled_previous_head_time = jiffies; - tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; - if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { - tape->uncontrolled_pipeline_head_time = jiffies; - } - } - tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); - if (tape->speed_control == 0) { - tape->max_insert_speed = 5000; - } else if (tape->speed_control == 1) { - if (tape->nr_pending_stages >= tape->max_stages / 2) - tape->max_insert_speed = tape->pipeline_head_speed + - (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; - else - tape->max_insert_speed = 500 + - (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; - if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) - tape->max_insert_speed = 5000; - } else if (tape->speed_control == 2) { - tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + - (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; - } else - tape->max_insert_speed = tape->speed_control; - tape->max_insert_speed = max(tape->max_insert_speed, 500); -} + stat = hwif->tp_ops->read_status(hwif); -static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_pc_t *pc = tape->pc; - atapi_status_t status; - - status.all = HWIF(drive)->INB(IDE_STATUS_REG); - if (status.b.dsc) { - if (status.b.check) { + if (stat & ATA_DSC) { + if (stat & ATA_ERR) { /* Error detected */ - if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) + if (pc->c[0] != TEST_UNIT_READY) printk(KERN_ERR "ide-tape: %s: I/O error, ", tape->name); /* Retry operation */ - return idetape_retry_pc(drive); + ide_retry_pc(drive); + return ide_stopped; } pc->error = 0; - if (tape->failed_pc == pc) - tape->failed_pc = NULL; } else { - pc->error = IDETAPE_ERROR_GENERAL; - tape->failed_pc = NULL; - } - return pc->callback(drive); -} - -static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - struct request *rq = HWGROUP(drive)->rq; - int blocks = tape->pc->actually_transferred / tape->tape_block_size; - - tape->avg_size += blocks * tape->tape_block_size; - tape->insert_size += blocks * tape->tape_block_size; - if (tape->insert_size > 1024 * 1024) - tape->measure_insert_time = 1; - if (tape->measure_insert_time) { - tape->measure_insert_time = 0; - tape->insert_time = jiffies; - tape->insert_size = 0; + pc->error = IDE_DRV_ERROR_GENERAL; + drive->failed_pc = NULL; } - if (time_after(jiffies, tape->insert_time)) - tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); - if (jiffies - tape->avg_time >= HZ) { - tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; - tape->avg_size = 0; - tape->avg_time = jiffies; - } - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); -#endif /* IDETAPE_DEBUG_LOG */ - - tape->first_frame_position += blocks; - rq->current_nr_sectors -= blocks; - - if (!tape->pc->error) - idetape_end_request(drive, 1, 0); - else - idetape_end_request(drive, tape->pc->error, 0); + drive->pc_callback(drive, 0); return ide_stopped; } -static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) +static void ide_tape_create_rw_cmd(idetape_tape_t *tape, + struct ide_atapi_pc *pc, struct request *rq, + u8 opcode) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_READ_CMD; - put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); + unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); + + ide_init_pc(pc); + put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); pc->c[1] = 1; - pc->callback = &idetape_rw_callback; - pc->bh = bh; - atomic_set(&bh->b_count, 0); - pc->buffer = NULL; - pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; - if (pc->request_transfer == tape->stage_size) - set_bit(PC_DMA_RECOMMENDED, &pc->flags); -} -static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) -{ - int size = 32768; - struct idetape_bh *p = bh; - - idetape_init_pc(pc); - pc->c[0] = IDETAPE_READ_BUFFER_CMD; - pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; - pc->c[7] = size >> 8; - pc->c[8] = size & 0xff; - pc->callback = &idetape_pc_callback; - pc->bh = bh; - atomic_set(&bh->b_count, 0); - pc->buffer = NULL; - while (p) { - atomic_set(&p->b_count, 0); - p = p->b_reqnext; + if (blk_rq_bytes(rq) == tape->buffer_size) + pc->flags |= PC_FLAG_DMA_OK; + + if (opcode == READ_6) + pc->c[0] = READ_6; + else if (opcode == WRITE_6) { + pc->c[0] = WRITE_6; + pc->flags |= PC_FLAG_WRITING; } - pc->request_transfer = pc->buffer_size = size; -} -static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) -{ - idetape_init_pc(pc); - pc->c[0] = IDETAPE_WRITE_CMD; - put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); - pc->c[1] = 1; - pc->callback = &idetape_rw_callback; - set_bit(PC_WRITING, &pc->flags); - pc->bh = bh; - pc->b_data = bh->b_data; - pc->b_count = atomic_read(&bh->b_count); - pc->buffer = NULL; - pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; - if (pc->request_transfer == tape->stage_size) - set_bit(PC_DMA_RECOMMENDED, &pc->flags); + memcpy(rq->cmd, pc->c, 12); } -/* - * idetape_do_request is our request handling function. - */ static ide_startstop_t idetape_do_request(ide_drive_t *drive, struct request *rq, sector_t block) { + ide_hwif_t *hwif = drive->hwif; idetape_tape_t *tape = drive->driver_data; - idetape_pc_t *pc = NULL; - struct request *postponed_rq = tape->postponed_rq; - atapi_status_t status; - -#if IDETAPE_DEBUG_LOG -#if 0 - if (tape->debug_level >= 5) - printk(KERN_INFO "ide-tape: rq_status: %d, " - "dev: %s, cmd: %ld, errors: %d\n", rq->rq_status, - rq->rq_disk->disk_name, rq->cmd[0], rq->errors); -#endif - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: sector: %ld, " - "nr_sectors: %ld, current_nr_sectors: %d\n", - rq->sector, rq->nr_sectors, rq->current_nr_sectors); -#endif /* IDETAPE_DEBUG_LOG */ + struct ide_atapi_pc *pc = NULL; + struct ide_cmd cmd; + u8 stat; - if ((rq->flags & REQ_SPECIAL) == 0) { - /* - * We do not support buffer cache originated requests. - */ - printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " - "request queue (%ld)\n", drive->name, rq->flags); - ide_end_request(drive, 0, 0); - return ide_stopped; - } + ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u", + rq->cmd[0], (unsigned long long)blk_rq_pos(rq), + blk_rq_sectors(rq)); - /* - * Retry a failed packet command - */ - if (tape->failed_pc != NULL && - tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { - return idetape_issue_packet_command(drive, tape->failed_pc); - } -#if IDETAPE_DEBUG_BUGS - if (postponed_rq != NULL) - if (rq != postponed_rq) { - printk(KERN_ERR "ide-tape: ide-tape.c bug - " - "Two DSC requests were queued\n"); - idetape_end_request(drive, 0, 0); - return ide_stopped; - } -#endif /* IDETAPE_DEBUG_BUGS */ + BUG_ON(!(rq->cmd_type == REQ_TYPE_SPECIAL || + rq->cmd_type == REQ_TYPE_SENSE)); - tape->postponed_rq = NULL; + /* Retry a failed packet command */ + if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { + pc = drive->failed_pc; + goto out; + } /* * If the tape is still busy, postpone our request and service * the other device meanwhile. */ - status.all = HWIF(drive)->INB(IDE_STATUS_REG); + stat = hwif->tp_ops->read_status(hwif); - if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) - set_bit(IDETAPE_IGNORE_DSC, &tape->flags); + if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && + (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) + drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; - if (drive->post_reset == 1) { - set_bit(IDETAPE_IGNORE_DSC, &tape->flags); - drive->post_reset = 0; + if (drive->dev_flags & IDE_DFLAG_POST_RESET) { + drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; + drive->dev_flags &= ~IDE_DFLAG_POST_RESET; } - if (tape->tape_still_time > 100 && tape->tape_still_time < 200) - tape->measure_insert_time = 1; - if (time_after(jiffies, tape->insert_time)) - tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); - calculate_speeds(drive); - if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && - !status.b.dsc) { - if (postponed_rq == NULL) { + if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && + !(stat & ATA_DSC)) { + if (!tape->postponed_rq) { tape->dsc_polling_start = jiffies; - tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; + tape->dsc_poll_freq = tape->best_dsc_rw_freq; tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; } else if (time_after(jiffies, tape->dsc_timeout)) { printk(KERN_ERR "ide-tape: %s: DSC timeout\n", tape->name); - if (rq->cmd[0] & REQ_IDETAPE_PC2) { + if (rq->cmd[13] & REQ_IDETAPE_PC2) { idetape_media_access_finished(drive); return ide_stopped; } else { return ide_do_reset(drive); } - } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD) - tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; - idetape_postpone_request(drive); + } else if (time_after(jiffies, + tape->dsc_polling_start + + IDETAPE_DSC_MA_THRESHOLD)) + tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; + ide_tape_stall_queue(drive); return ide_stopped; + } else { + drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; + tape->postponed_rq = false; } - if (rq->cmd[0] & REQ_IDETAPE_READ) { - tape->buffer_head++; -#if USE_IOTRACE - IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); -#endif - tape->postpone_cnt = 0; - pc = idetape_next_pc_storage(drive); - idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); - goto out; - } - if (rq->cmd[0] & REQ_IDETAPE_WRITE) { - tape->buffer_head++; -#if USE_IOTRACE - IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); -#endif - tape->postpone_cnt = 0; - pc = idetape_next_pc_storage(drive); - idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); + + if (rq->cmd[13] & REQ_IDETAPE_READ) { + pc = &tape->queued_pc; + ide_tape_create_rw_cmd(tape, pc, rq, READ_6); goto out; } - if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { - tape->postpone_cnt = 0; - pc = idetape_next_pc_storage(drive); - idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); + if (rq->cmd[13] & REQ_IDETAPE_WRITE) { + pc = &tape->queued_pc; + ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); goto out; } - if (rq->cmd[0] & REQ_IDETAPE_PC1) { - pc = (idetape_pc_t *) rq->buffer; - rq->cmd[0] &= ~(REQ_IDETAPE_PC1); - rq->cmd[0] |= REQ_IDETAPE_PC2; + if (rq->cmd[13] & REQ_IDETAPE_PC1) { + pc = (struct ide_atapi_pc *)rq->special; + rq->cmd[13] &= ~(REQ_IDETAPE_PC1); + rq->cmd[13] |= REQ_IDETAPE_PC2; goto out; } - if (rq->cmd[0] & REQ_IDETAPE_PC2) { + if (rq->cmd[13] & REQ_IDETAPE_PC2) { idetape_media_access_finished(drive); return ide_stopped; } BUG(); -out: - return idetape_issue_packet_command(drive, pc); -} -/* - * Pipeline related functions - */ -static inline int idetape_pipeline_active (idetape_tape_t *tape) -{ - int rc1, rc2; - - rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); - rc2 = (tape->active_data_request != NULL); - return rc1; -} - -/* - * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline - * stage, along with all the necessary small buffers which together make - * a buffer of size tape->stage_size (or a bit more). We attempt to - * combine sequential pages as much as possible. - * - * Returns a pointer to the new allocated stage, or NULL if we - * can't (or don't want to) allocate a stage. - * - * Pipeline stages are optional and are used to increase performance. - * If we can't allocate them, we'll manage without them. - */ -static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) -{ - idetape_stage_t *stage; - struct idetape_bh *prev_bh, *bh; - int pages = tape->pages_per_stage; - char *b_data = NULL; - - if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) - return NULL; - stage->next = NULL; - - bh = stage->bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); - if (bh == NULL) - goto abort; - bh->b_reqnext = NULL; - if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) - goto abort; - if (clear) - memset(bh->b_data, 0, PAGE_SIZE); - bh->b_size = PAGE_SIZE; - atomic_set(&bh->b_count, full ? bh->b_size : 0); - - while (--pages) { - if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) - goto abort; - if (clear) - memset(b_data, 0, PAGE_SIZE); - if (bh->b_data == b_data + PAGE_SIZE) { - bh->b_size += PAGE_SIZE; - bh->b_data -= PAGE_SIZE; - if (full) - atomic_add(PAGE_SIZE, &bh->b_count); - continue; - } - if (b_data == bh->b_data + bh->b_size) { - bh->b_size += PAGE_SIZE; - if (full) - atomic_add(PAGE_SIZE, &bh->b_count); - continue; - } - prev_bh = bh; - if ((bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { - free_page((unsigned long) b_data); - goto abort; - } - bh->b_reqnext = NULL; - bh->b_data = b_data; - bh->b_size = PAGE_SIZE; - atomic_set(&bh->b_count, full ? bh->b_size : 0); - prev_bh->b_reqnext = bh; - } - bh->b_size -= tape->excess_bh_size; - if (full) - atomic_sub(tape->excess_bh_size, &bh->b_count); - return stage; -abort: - __idetape_kfree_stage(stage); - return NULL; -} - -static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) -{ - idetape_stage_t *cache_stage = tape->cache_stage; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); -#endif /* IDETAPE_DEBUG_LOG */ - - if (tape->nr_stages >= tape->max_stages) - return NULL; - if (cache_stage != NULL) { - tape->cache_stage = NULL; - return cache_stage; - } - return __idetape_kmalloc_stage(tape, 0, 0); -} - -static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) -{ - struct idetape_bh *bh = tape->bh; - int count; - - while (n) { -#if IDETAPE_DEBUG_BUGS - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_copy_stage_from_user\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); - copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count); - n -= count; - atomic_add(count, &bh->b_count); - buf += count; - if (atomic_read(&bh->b_count) == bh->b_size) { - bh = bh->b_reqnext; - if (bh) - atomic_set(&bh->b_count, 0); - } - } - tape->bh = bh; -} - -static void idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) -{ - struct idetape_bh *bh = tape->bh; - int count; - - while (n) { -#if IDETAPE_DEBUG_BUGS - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_copy_stage_to_user\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - count = min(tape->b_count, n); - copy_to_user(buf, tape->b_data, count); - n -= count; - tape->b_data += count; - tape->b_count -= count; - buf += count; - if (!tape->b_count) { - tape->bh = bh = bh->b_reqnext; - if (bh) { - tape->b_data = bh->b_data; - tape->b_count = atomic_read(&bh->b_count); - } - } - } -} +out: + /* prepare sense request for this command */ + ide_prep_sense(drive, rq); -static void idetape_init_merge_stage (idetape_tape_t *tape) -{ - struct idetape_bh *bh = tape->merge_stage->bh; - - tape->bh = bh; - if (tape->chrdev_direction == idetape_direction_write) - atomic_set(&bh->b_count, 0); - else { - tape->b_data = bh->b_data; - tape->b_count = atomic_read(&bh->b_count); - } -} + memset(&cmd, 0, sizeof(cmd)); -static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) -{ - struct idetape_bh *tmp; + if (rq_data_dir(rq)) + cmd.tf_flags |= IDE_TFLAG_WRITE; - tmp = stage->bh; - stage->bh = tape->merge_stage->bh; - tape->merge_stage->bh = tmp; - idetape_init_merge_stage(tape); -} + cmd.rq = rq; -/* - * idetape_add_stage_tail adds a new stage at the end of the pipeline. - */ -static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) -{ - idetape_tape_t *tape = drive->driver_data; - unsigned long flags; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); -#endif /* IDETAPE_DEBUG_LOG */ - spin_lock_irqsave(&tape->spinlock, flags); - stage->next = NULL; - if (tape->last_stage != NULL) - tape->last_stage->next=stage; - else - tape->first_stage = tape->next_stage=stage; - tape->last_stage = stage; - if (tape->next_stage == NULL) - tape->next_stage = tape->last_stage; - tape->nr_stages++; - tape->nr_pending_stages++; - spin_unlock_irqrestore(&tape->spinlock, flags); -} + ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); + ide_map_sg(drive, &cmd); -/* - * idetape_wait_for_request installs a completion in a pending request - * and sleeps until it is serviced. - * - * The caller should ensure that the request will not be serviced - * before we install the completion (usually by disabling interrupts). - */ -static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) -{ - DECLARE_COMPLETION(wait); - idetape_tape_t *tape = drive->driver_data; - -#if IDETAPE_DEBUG_BUGS - if (rq == NULL || (rq->flags & REQ_SPECIAL) == 0) { - printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); - return; - } -#endif /* IDETAPE_DEBUG_BUGS */ - rq->waiting = &wait; - rq->end_io = blk_end_sync_rq; - spin_unlock_irq(&tape->spinlock); - wait_for_completion(&wait); - /* The stage and its struct request have been deallocated */ - spin_lock_irq(&tape->spinlock); -} - -static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_read_position_result_t *result; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); -#endif /* IDETAPE_DEBUG_LOG */ - - if (!tape->pc->error) { - result = (idetape_read_position_result_t *) tape->pc->buffer; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); -#endif /* IDETAPE_DEBUG_LOG */ - if (result->bpu) { - printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); - clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); - idetape_end_request(drive, 0, 0); - } else { -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); -#endif /* IDETAPE_DEBUG_LOG */ - tape->partition = result->partition; - tape->first_frame_position = ntohl(result->first_block); - tape->last_frame_position = ntohl(result->last_block); - tape->blocks_in_buffer = result->blocks_in_buffer[2]; - set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); - idetape_end_request(drive, 1, 0); - } - } else { - idetape_end_request(drive, 0, 0); - } - return ide_stopped; + return ide_tape_issue_pc(drive, &cmd, pc); } /* - * idetape_create_write_filemark_cmd will: - * - * 1. Write a filemark if write_filemark=1. - * 2. Flush the device buffers without writing a filemark - * if write_filemark=0. - * + * Write a filemark if write_filemark=1. Flush the device buffers without + * writing a filemark otherwise. */ -static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) +static void idetape_create_write_filemark_cmd(ide_drive_t *drive, + struct ide_atapi_pc *pc, int write_filemark) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; + ide_init_pc(pc); + pc->c[0] = WRITE_FILEMARKS; pc->c[4] = write_filemark; - set_bit(PC_WAIT_FOR_DSC, &pc->flags); - pc->callback = &idetape_pc_callback; -} - -static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) -{ - idetape_init_pc(pc); - pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; - pc->callback = &idetape_pc_callback; -} - -/* - * idetape_queue_pc_tail is based on the following functions: - * - * ide_do_drive_cmd from ide.c - * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c - * - * We add a special packet command request to the tail of the request - * queue, and wait for it to be serviced. - * - * This is not to be called from within the request handling part - * of the driver ! We allocate here data in the stack, and it is valid - * until the request is finished. This is not the case for the bottom - * part of the driver, where we are always leaving the functions to wait - * for an interrupt or a timer event. - * - * From the bottom part of the driver, we should allocate safe memory - * using idetape_next_pc_storage and idetape_next_rq_storage, and add - * the request to the request list without waiting for it to be serviced ! - * In that case, we usually use idetape_queue_pc_head. - */ -static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) -{ - struct ide_tape_obj *tape = drive->driver_data; - struct request rq; - - idetape_init_rq(&rq, REQ_IDETAPE_PC1); - rq.buffer = (char *) pc; - rq.rq_disk = tape->disk; - return ide_do_drive_cmd(drive, &rq, ide_wait); -} - -static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) -{ - idetape_init_pc(pc); - pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; - pc->c[4] = cmd; - set_bit(PC_WAIT_FOR_DSC, &pc->flags); - pc->callback = &idetape_pc_callback; + pc->flags |= PC_FLAG_WAIT_FOR_DSC; } static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) { idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; + struct gendisk *disk = tape->disk; int load_attempted = 0; - /* - * Wait for the tape to become ready - */ - set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); + /* Wait for the tape to become ready */ + set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); timeout += jiffies; while (time_before(jiffies, timeout)) { - idetape_create_test_unit_ready_cmd(&pc); - if (!__idetape_queue_pc_tail(drive, &pc)) + if (ide_do_test_unit_ready(drive, disk) == 0) return 0; if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) - || (tape->asc == 0x3A)) { /* no media */ + || (tape->asc == 0x3A)) { + /* no media */ if (load_attempted) return -ENOMEDIUM; - idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); - __idetape_queue_pc_tail(drive, &pc); + ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); load_attempted = 1; /* not about to be ready */ } else if (!(tape->sense_key == 2 && tape->asc == 4 && @@ -2910,964 +706,530 @@ static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) return -EIO; } -static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) -{ - return __idetape_queue_pc_tail(drive, pc); -} - -static int idetape_flush_tape_buffers (ide_drive_t *drive) +static int idetape_flush_tape_buffers(ide_drive_t *drive) { - idetape_pc_t pc; + struct ide_tape_obj *tape = drive->driver_data; + struct ide_atapi_pc pc; int rc; idetape_create_write_filemark_cmd(drive, &pc, 0); - if ((rc = idetape_queue_pc_tail(drive, &pc))) + rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); + if (rc) return rc; idetape_wait_ready(drive, 60 * 5 * HZ); return 0; } -static void idetape_create_read_position_cmd (idetape_pc_t *pc) -{ - idetape_init_pc(pc); - pc->c[0] = IDETAPE_READ_POSITION_CMD; - pc->request_transfer = 20; - pc->callback = &idetape_read_position_callback; -} - -static int idetape_read_position (ide_drive_t *drive) +static int ide_tape_read_position(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; - int position; + struct ide_atapi_pc pc; + u8 buf[20]; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); -#endif /* IDETAPE_DEBUG_LOG */ + ide_debug_log(IDE_DBG_FUNC, "enter"); - idetape_create_read_position_cmd(&pc); - if (idetape_queue_pc_tail(drive, &pc)) + /* prep cmd */ + ide_init_pc(&pc); + pc.c[0] = READ_POSITION; + pc.req_xfer = 20; + + if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) return -1; - position = tape->first_frame_position; - return position; + + if (!pc.error) { + ide_debug_log(IDE_DBG_FUNC, "BOP - %s", + (buf[0] & 0x80) ? "Yes" : "No"); + ide_debug_log(IDE_DBG_FUNC, "EOP - %s", + (buf[0] & 0x40) ? "Yes" : "No"); + + if (buf[0] & 0x4) { + printk(KERN_INFO "ide-tape: Block location is unknown" + "to the tape\n"); + clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), + &drive->atapi_flags); + return -1; + } else { + ide_debug_log(IDE_DBG_FUNC, "Block Location: %u", + be32_to_cpup((__be32 *)&buf[4])); + + tape->partition = buf[1]; + tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); + set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), + &drive->atapi_flags); + } + } + + return tape->first_frame; } -static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) +static void idetape_create_locate_cmd(ide_drive_t *drive, + struct ide_atapi_pc *pc, + unsigned int block, u8 partition, int skip) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_LOCATE_CMD; + ide_init_pc(pc); + pc->c[0] = POSITION_TO_ELEMENT; pc->c[1] = 2; - put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); + put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); pc->c[8] = partition; - set_bit(PC_WAIT_FOR_DSC, &pc->flags); - pc->callback = &idetape_pc_callback; -} - -static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) -{ - idetape_tape_t *tape = drive->driver_data; - - if (!tape->capabilities.lock) - return 0; - - idetape_init_pc(pc); - pc->c[0] = IDETAPE_PREVENT_CMD; - pc->c[4] = prevent; - pc->callback = &idetape_pc_callback; - return 1; + pc->flags |= PC_FLAG_WAIT_FOR_DSC; } -static int __idetape_discard_read_pipeline (ide_drive_t *drive) +static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - unsigned long flags; - int cnt; - if (tape->chrdev_direction != idetape_direction_read) - return 0; + if (tape->chrdev_dir != IDETAPE_DIR_READ) + return; - /* Remove merge stage. */ - cnt = tape->merge_stage_size / tape->tape_block_size; - if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) - ++cnt; /* Filemarks count as 1 sector */ - tape->merge_stage_size = 0; - if (tape->merge_stage != NULL) { - __idetape_kfree_stage(tape->merge_stage); - tape->merge_stage = NULL; + clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); + tape->valid = 0; + if (tape->buf != NULL) { + kfree(tape->buf); + tape->buf = NULL; } - /* Clear pipeline flags. */ - clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); - tape->chrdev_direction = idetape_direction_none; - - /* Remove pipeline stages. */ - if (tape->first_stage == NULL) - return 0; - - spin_lock_irqsave(&tape->spinlock, flags); - tape->next_stage = NULL; - if (idetape_pipeline_active(tape)) - idetape_wait_for_request(drive, tape->active_data_request); - spin_unlock_irqrestore(&tape->spinlock, flags); - - while (tape->first_stage != NULL) { - struct request *rq_ptr = &tape->first_stage->rq; - - cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; - if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) - ++cnt; - idetape_remove_stage_head(drive); - } - tape->nr_pending_stages = 0; - tape->max_stages = tape->min_pipeline; - return cnt; + tape->chrdev_dir = IDETAPE_DIR_NONE; } /* - * idetape_position_tape positions the tape to the requested block - * using the LOCATE packet command. A READ POSITION command is then - * issued to check where we are positioned. - * - * Like all higher level operations, we queue the commands at the tail - * of the request queue and wait for their completion. - * + * Position the tape to the requested block using the LOCATE packet command. + * A READ POSITION command is then issued to check where we are positioned. Like + * all higher level operations, we queue the commands at the tail of the request + * queue and wait for their completion. */ -static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) +static int idetape_position_tape(ide_drive_t *drive, unsigned int block, + u8 partition, int skip) { idetape_tape_t *tape = drive->driver_data; - int retval; - idetape_pc_t pc; + struct gendisk *disk = tape->disk; + int ret; + struct ide_atapi_pc pc; - if (tape->chrdev_direction == idetape_direction_read) - __idetape_discard_read_pipeline(drive); + if (tape->chrdev_dir == IDETAPE_DIR_READ) + __ide_tape_discard_merge_buffer(drive); idetape_wait_ready(drive, 60 * 5 * HZ); idetape_create_locate_cmd(drive, &pc, block, partition, skip); - retval = idetape_queue_pc_tail(drive, &pc); - if (retval) - return (retval); + ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); + if (ret) + return ret; - idetape_create_read_position_cmd(&pc); - return (idetape_queue_pc_tail(drive, &pc)); + ret = ide_tape_read_position(drive); + if (ret < 0) + return ret; + return 0; } -static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) +static void ide_tape_discard_merge_buffer(ide_drive_t *drive, + int restore_position) { idetape_tape_t *tape = drive->driver_data; - int cnt; int seek, position; - cnt = __idetape_discard_read_pipeline(drive); + __ide_tape_discard_merge_buffer(drive); if (restore_position) { - position = idetape_read_position(drive); - seek = position > cnt ? position - cnt : 0; + position = ide_tape_read_position(drive); + seek = position > 0 ? position : 0; if (idetape_position_tape(drive, seek, 0, 0)) { - printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); + printk(KERN_INFO "ide-tape: %s: position_tape failed in" + " %s\n", tape->name, __func__); return; } } } /* - * idetape_queue_rw_tail generates a read/write request for the block - * device interface and wait for it to be serviced. + * Generate a read/write request for the block device interface and wait for it + * to be serviced. */ -static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) +static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) { idetape_tape_t *tape = drive->driver_data; - struct request rq; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); -#endif /* IDETAPE_DEBUG_LOG */ -#if IDETAPE_DEBUG_BUGS - if (idetape_pipeline_active(tape)) { - printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); - return (0); - } -#endif /* IDETAPE_DEBUG_BUGS */ + struct request *rq; + int ret; - idetape_init_rq(&rq, cmd); - rq.rq_disk = tape->disk; - rq.special = (void *)bh; - rq.sector = tape->first_frame_position; - rq.nr_sectors = rq.current_nr_sectors = blocks; - (void) ide_do_drive_cmd(drive, &rq, ide_wait); + ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size); - if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) - return 0; + BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); + BUG_ON(size < 0 || size % tape->blk_size); - if (tape->merge_stage) - idetape_init_merge_stage(tape); - if (rq.errors == IDETAPE_ERROR_GENERAL) - return -EIO; - return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); -} - -/* - * idetape_insert_pipeline_into_queue is used to start servicing the - * pipeline stages, starting from tape->next_stage. - */ -static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; + rq = blk_get_request(drive->queue, READ, __GFP_WAIT); + rq->cmd_type = REQ_TYPE_SPECIAL; + rq->cmd[13] = cmd; + rq->rq_disk = tape->disk; + rq->__sector = tape->first_frame; - if (tape->next_stage == NULL) - return; - if (!idetape_pipeline_active(tape)) { - set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); - idetape_active_next_stage(drive); - (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); + if (size) { + ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, + __GFP_WAIT); + if (ret) + goto out_put; } -} -static void idetape_create_inquiry_cmd (idetape_pc_t *pc) -{ - idetape_init_pc(pc); - pc->c[0] = IDETAPE_INQUIRY_CMD; - pc->c[4] = pc->request_transfer = 254; - pc->callback = &idetape_pc_callback; + blk_execute_rq(drive->queue, tape->disk, rq, 0); + + /* calculate the number of transferred bytes and update buffer state */ + size -= rq->resid_len; + tape->cur = tape->buf; + if (cmd == REQ_IDETAPE_READ) + tape->valid = size; + else + tape->valid = 0; + + ret = size; + if (rq->errors == IDE_DRV_ERROR_GENERAL) + ret = -EIO; +out_put: + blk_put_request(rq); + return ret; } -static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) +static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_REWIND_CMD; - set_bit(PC_WAIT_FOR_DSC, &pc->flags); - pc->callback = &idetape_pc_callback; + ide_init_pc(pc); + pc->c[0] = INQUIRY; + pc->c[4] = 254; + pc->req_xfer = 254; } -#if 0 -static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) +static void idetape_create_rewind_cmd(ide_drive_t *drive, + struct ide_atapi_pc *pc) { - idetape_init_pc(pc); - set_bit(PC_WRITING, &pc->flags); - pc->c[0] = IDETAPE_MODE_SELECT_CMD; - pc->c[1] = 0x10; - put_unaligned(htons(length), (unsigned short *) &pc->c[3]); - pc->request_transfer = 255; - pc->callback = &idetape_pc_callback; + ide_init_pc(pc); + pc->c[0] = REZERO_UNIT; + pc->flags |= PC_FLAG_WAIT_FOR_DSC; } -#endif -static void idetape_create_erase_cmd (idetape_pc_t *pc) +static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_ERASE_CMD; + ide_init_pc(pc); + pc->c[0] = ERASE; pc->c[1] = 1; - set_bit(PC_WAIT_FOR_DSC, &pc->flags); - pc->callback = &idetape_pc_callback; + pc->flags |= PC_FLAG_WAIT_FOR_DSC; } -static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) +static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) { - idetape_init_pc(pc); - pc->c[0] = IDETAPE_SPACE_CMD; - put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); + ide_init_pc(pc); + pc->c[0] = SPACE; + put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); pc->c[1] = cmd; - set_bit(PC_WAIT_FOR_DSC, &pc->flags); - pc->callback = &idetape_pc_callback; + pc->flags |= PC_FLAG_WAIT_FOR_DSC; } -static void idetape_wait_first_stage (ide_drive_t *drive) +static void ide_tape_flush_merge_buffer(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - unsigned long flags; - if (tape->first_stage == NULL) + if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { + printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" + " but we are not writing.\n"); return; - spin_lock_irqsave(&tape->spinlock, flags); - if (tape->active_stage == tape->first_stage) - idetape_wait_for_request(drive, tape->active_data_request); - spin_unlock_irqrestore(&tape->spinlock, flags); + } + if (tape->buf) { + size_t aligned = roundup(tape->valid, tape->blk_size); + + memset(tape->cur, 0, aligned - tape->valid); + idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); + kfree(tape->buf); + tape->buf = NULL; + } + tape->chrdev_dir = IDETAPE_DIR_NONE; } -/* - * idetape_add_chrdev_write_request tries to add a character device - * originated write request to our pipeline. In case we don't succeed, - * we revert to non-pipelined operation mode for this request. - * - * 1. Try to allocate a new pipeline stage. - * 2. If we can't, wait for more and more requests to be serviced - * and try again each time. - * 3. If we still can't allocate a stage, fallback to - * non-pipelined operation mode for this request. - */ -static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) +static int idetape_init_rw(ide_drive_t *drive, int dir) { idetape_tape_t *tape = drive->driver_data; - idetape_stage_t *new_stage; - unsigned long flags; - struct request *rq; + int rc; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 3) - printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); -#endif /* IDETAPE_DEBUG_LOG */ + BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); - /* - * Attempt to allocate a new stage. - * Pay special attention to possible race conditions. - */ - while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { - spin_lock_irqsave(&tape->spinlock, flags); - if (idetape_pipeline_active(tape)) { - idetape_wait_for_request(drive, tape->active_data_request); - spin_unlock_irqrestore(&tape->spinlock, flags); - } else { - spin_unlock_irqrestore(&tape->spinlock, flags); - idetape_insert_pipeline_into_queue(drive); - if (idetape_pipeline_active(tape)) - continue; - /* - * Linux is short on memory. Fallback to - * non-pipelined operation mode for this request. - */ - return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); - } - } - rq = &new_stage->rq; - idetape_init_rq(rq, REQ_IDETAPE_WRITE); - /* Doesn't actually matter - We always assume sequential access */ - rq->sector = tape->first_frame_position; - rq->nr_sectors = rq->current_nr_sectors = blocks; - - idetape_switch_buffers(tape, new_stage); - idetape_add_stage_tail(drive, new_stage); - tape->pipeline_head++; -#if USE_IOTRACE - IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); -#endif - calculate_speeds(drive); + if (tape->chrdev_dir == dir) + return 0; - /* - * Estimate whether the tape has stopped writing by checking - * if our write pipeline is currently empty. If we are not - * writing anymore, wait for the pipeline to be full enough - * (90%) before starting to service requests, so that we will - * be able to keep up with the higher speeds of the tape. - */ - if (!idetape_pipeline_active(tape)) { - if (tape->nr_stages >= tape->max_stages * 9 / 10 || - tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { - tape->measure_insert_time = 1; - tape->insert_time = jiffies; - tape->insert_size = 0; - tape->insert_speed = 0; - idetape_insert_pipeline_into_queue(drive); - } + if (tape->chrdev_dir == IDETAPE_DIR_READ) + ide_tape_discard_merge_buffer(drive, 1); + else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { + ide_tape_flush_merge_buffer(drive); + idetape_flush_tape_buffers(drive); } - if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) - /* Return a deferred error */ - return -EIO; - return blocks; -} -/* - * idetape_wait_for_pipeline will wait until all pending pipeline - * requests are serviced. Typically called on device close. - */ -static void idetape_wait_for_pipeline (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - unsigned long flags; - - while (tape->next_stage || idetape_pipeline_active(tape)) { - idetape_insert_pipeline_into_queue(drive); - spin_lock_irqsave(&tape->spinlock, flags); - if (idetape_pipeline_active(tape)) - idetape_wait_for_request(drive, tape->active_data_request); - spin_unlock_irqrestore(&tape->spinlock, flags); + if (tape->buf || tape->valid) { + printk(KERN_ERR "ide-tape: valid should be 0 now\n"); + tape->valid = 0; } -} -static void idetape_empty_write_pipeline (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - int blocks, min; - struct idetape_bh *bh; - -#if IDETAPE_DEBUG_BUGS - if (tape->chrdev_direction != idetape_direction_write) { - printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); - return; - } - if (tape->merge_stage_size > tape->stage_size) { - printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); - tape->merge_stage_size = tape->stage_size; - } -#endif /* IDETAPE_DEBUG_BUGS */ - if (tape->merge_stage_size) { - blocks = tape->merge_stage_size / tape->tape_block_size; - if (tape->merge_stage_size % tape->tape_block_size) { - unsigned int i; - - blocks++; - i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; - bh = tape->bh->b_reqnext; - while (bh) { - atomic_set(&bh->b_count, 0); - bh = bh->b_reqnext; - } - bh = tape->bh; - while (i) { - if (bh == NULL) { - - printk(KERN_INFO "ide-tape: bug, bh NULL\n"); - break; - } - min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); - memset(bh->b_data + atomic_read(&bh->b_count), 0, min); - atomic_add(min, &bh->b_count); - i -= min; - bh = bh->b_reqnext; - } - } - (void) idetape_add_chrdev_write_request(drive, blocks); - tape->merge_stage_size = 0; - } - idetape_wait_for_pipeline(drive); - if (tape->merge_stage != NULL) { - __idetape_kfree_stage(tape->merge_stage); - tape->merge_stage = NULL; - } - clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); - tape->chrdev_direction = idetape_direction_none; + tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); + if (!tape->buf) + return -ENOMEM; + tape->chrdev_dir = dir; + tape->cur = tape->buf; /* - * On the next backup, perform the feedback loop again. - * (I don't want to keep sense information between backups, - * as some systems are constantly on, and the system load - * can be totally different on the next backup). + * Issue a 0 rw command to ensure that DSC handshake is + * switched from completion mode to buffer available mode. No + * point in issuing this if DSC overlap isn't supported, some + * drives (Seagate STT3401A) will return an error. */ - tape->max_stages = tape->min_pipeline; -#if IDETAPE_DEBUG_BUGS - if (tape->first_stage != NULL || - tape->next_stage != NULL || - tape->last_stage != NULL || - tape->nr_stages != 0) { - printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " - "first_stage %p, next_stage %p, " - "last_stage %p, nr_stages %d\n", - tape->first_stage, tape->next_stage, - tape->last_stage, tape->nr_stages); - } -#endif /* IDETAPE_DEBUG_BUGS */ -} - -static void idetape_restart_speed_control (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - - tape->restart_speed_control_req = 0; - tape->pipeline_head = 0; - tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; - tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; - tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; - tape->uncontrolled_pipeline_head_speed = 0; - tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; - tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; -} - -static int idetape_initiate_read (ide_drive_t *drive, int max_stages) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_stage_t *new_stage; - struct request rq; - int bytes_read; - int blocks = tape->capabilities.ctl; - - /* Initialize read operation */ - if (tape->chrdev_direction != idetape_direction_read) { - if (tape->chrdev_direction == idetape_direction_write) { - idetape_empty_write_pipeline(drive); - idetape_flush_tape_buffers(drive); - } -#if IDETAPE_DEBUG_BUGS - if (tape->merge_stage || tape->merge_stage_size) { - printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); - tape->merge_stage_size = 0; - } -#endif /* IDETAPE_DEBUG_BUGS */ - if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) - return -ENOMEM; - tape->chrdev_direction = idetape_direction_read; - - /* - * Issue a read 0 command to ensure that DSC handshake - * is switched from completion mode to buffer available - * mode. - * No point in issuing this if DSC overlap isn't supported, - * some drives (Seagate STT3401A) will return an error. - */ - if (drive->dsc_overlap) { - bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); - if (bytes_read < 0) { - __idetape_kfree_stage(tape->merge_stage); - tape->merge_stage = NULL; - tape->chrdev_direction = idetape_direction_none; - return bytes_read; - } - } - } - if (tape->restart_speed_control_req) - idetape_restart_speed_control(drive); - idetape_init_rq(&rq, REQ_IDETAPE_READ); - rq.sector = tape->first_frame_position; - rq.nr_sectors = rq.current_nr_sectors = blocks; - if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && - tape->nr_stages < max_stages) { - new_stage = idetape_kmalloc_stage(tape); - while (new_stage != NULL) { - new_stage->rq = rq; - idetape_add_stage_tail(drive, new_stage); - if (tape->nr_stages >= max_stages) - break; - new_stage = idetape_kmalloc_stage(tape); - } - } - if (!idetape_pipeline_active(tape)) { - if (tape->nr_pending_stages >= 3 * max_stages / 4) { - tape->measure_insert_time = 1; - tape->insert_time = jiffies; - tape->insert_size = 0; - tape->insert_speed = 0; - idetape_insert_pipeline_into_queue(drive); + if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { + int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ + : REQ_IDETAPE_WRITE; + + rc = idetape_queue_rw_tail(drive, cmd, 0); + if (rc < 0) { + kfree(tape->buf); + tape->buf = NULL; + tape->chrdev_dir = IDETAPE_DIR_NONE; + return rc; } } + return 0; } -/* - * idetape_add_chrdev_read_request is called from idetape_chrdev_read - * to service a character device read request and add read-ahead - * requests to our pipeline. - */ -static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) +static void idetape_pad_zeros(ide_drive_t *drive, int bcount) { idetape_tape_t *tape = drive->driver_data; - unsigned long flags; - struct request *rq_ptr; - int bytes_read; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); -#endif /* IDETAPE_DEBUG_LOG */ - - /* - * If we are at a filemark, return a read length of 0 - */ - if (test_bit(IDETAPE_FILEMARK, &tape->flags)) - return 0; - /* - * Wait for the next block to be available at the head - * of the pipeline - */ - idetape_initiate_read(drive, tape->max_stages); - if (tape->first_stage == NULL) { - if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) - return 0; - return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); - } - idetape_wait_first_stage(drive); - rq_ptr = &tape->first_stage->rq; - bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); - rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; + memset(tape->buf, 0, tape->buffer_size); - - if (rq_ptr->errors == IDETAPE_ERROR_EOD) - return 0; - else { - idetape_switch_buffers(tape, tape->first_stage); - if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) - set_bit(IDETAPE_FILEMARK, &tape->flags); - spin_lock_irqsave(&tape->spinlock, flags); - idetape_remove_stage_head(drive); - spin_unlock_irqrestore(&tape->spinlock, flags); - tape->pipeline_head++; -#if USE_IOTRACE - IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); -#endif - calculate_speeds(drive); - } -#if IDETAPE_DEBUG_BUGS - if (bytes_read > blocks * tape->tape_block_size) { - printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); - bytes_read = blocks * tape->tape_block_size; - } -#endif /* IDETAPE_DEBUG_BUGS */ - return (bytes_read); -} - -static void idetape_pad_zeros (ide_drive_t *drive, int bcount) -{ - idetape_tape_t *tape = drive->driver_data; - struct idetape_bh *bh; - int blocks; - while (bcount) { - unsigned int count; + unsigned int count = min(tape->buffer_size, bcount); - bh = tape->merge_stage->bh; - count = min(tape->stage_size, bcount); + idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); bcount -= count; - blocks = count / tape->tape_block_size; - while (count) { - atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); - memset(bh->b_data, 0, atomic_read(&bh->b_count)); - count -= atomic_read(&bh->b_count); - bh = bh->b_reqnext; - } - idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); } } -static int idetape_pipeline_size (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - idetape_stage_t *stage; - struct request *rq; - int size = 0; - - idetape_wait_for_pipeline(drive); - stage = tape->first_stage; - while (stage != NULL) { - rq = &stage->rq; - size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); - if (rq->errors == IDETAPE_ERROR_FILEMARK) - size += tape->tape_block_size; - stage = stage->next; - } - size += tape->merge_stage_size; - return size; -} - /* - * Rewinds the tape to the Beginning Of the current Partition (BOP). - * - * We currently support only one partition. - */ -static int idetape_rewind_tape (ide_drive_t *drive) + * Rewinds the tape to the Beginning Of the current Partition (BOP). We + * currently support only one partition. + */ +static int idetape_rewind_tape(ide_drive_t *drive) { - int retval; - idetape_pc_t pc; -#if IDETAPE_DEBUG_LOG - idetape_tape_t *tape = drive->driver_data; - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); -#endif /* IDETAPE_DEBUG_LOG */ - + struct ide_tape_obj *tape = drive->driver_data; + struct gendisk *disk = tape->disk; + struct ide_atapi_pc pc; + int ret; + + ide_debug_log(IDE_DBG_FUNC, "enter"); + idetape_create_rewind_cmd(drive, &pc); - retval = idetape_queue_pc_tail(drive, &pc); - if (retval) - return retval; + ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); + if (ret) + return ret; - idetape_create_read_position_cmd(&pc); - retval = idetape_queue_pc_tail(drive, &pc); - if (retval) - return retval; + ret = ide_tape_read_position(drive); + if (ret < 0) + return ret; return 0; } -/* - * Our special ide-tape ioctl's. - * - * Currently there aren't any ioctl's. - * mtio.h compatible commands should be issued to the character device - * interface. - */ -static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) +/* mtio.h compatible commands should be issued to the chrdev interface. */ +static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, + unsigned long arg) { idetape_tape_t *tape = drive->driver_data; - idetape_config_t config; void __user *argp = (void __user *)arg; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 4) - printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); -#endif /* IDETAPE_DEBUG_LOG */ + struct idetape_config { + int dsc_rw_frequency; + int dsc_media_access_frequency; + int nr_stages; + } config; + + ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd); + switch (cmd) { - case 0x0340: - if (copy_from_user(&config, argp, sizeof (idetape_config_t))) - return -EFAULT; - tape->best_dsc_rw_frequency = config.dsc_rw_frequency; - tape->max_stages = config.nr_stages; - break; - case 0x0350: - config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; - config.nr_stages = tape->max_stages; - if (copy_to_user(argp, &config, sizeof (idetape_config_t))) - return -EFAULT; - break; - default: - return -EIO; + case 0x0340: + if (copy_from_user(&config, argp, sizeof(config))) + return -EFAULT; + tape->best_dsc_rw_freq = config.dsc_rw_frequency; + break; + case 0x0350: + memset(&config, 0, sizeof(config)); + config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; + config.nr_stages = 1; + if (copy_to_user(argp, &config, sizeof(config))) + return -EFAULT; + break; + default: + return -EIO; } return 0; } -/* - * idetape_space_over_filemarks is now a bit more complicated than just - * passing the command to the tape since we may have crossed some - * filemarks during our pipelined read-ahead mode. - * - * As a minor side effect, the pipeline enables us to support MTFSFM when - * the filemark is in our internal pipeline even if the tape doesn't - * support spacing over filemarks in the reverse direction. - */ -static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) +static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, + int mt_count) { idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; - unsigned long flags; - int retval,count=0; + struct gendisk *disk = tape->disk; + struct ide_atapi_pc pc; + int retval, count = 0; + int sprev = !!(tape->caps[4] & 0x20); + + + ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count); if (mt_count == 0) return 0; if (MTBSF == mt_op || MTBSFM == mt_op) { - if (!tape->capabilities.sprev) + if (!sprev) return -EIO; - mt_count = - mt_count; + mt_count = -mt_count; } - if (tape->chrdev_direction == idetape_direction_read) { - /* - * We have a read-ahead buffer. Scan it for crossed - * filemarks. - */ - tape->merge_stage_size = 0; - if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) + if (tape->chrdev_dir == IDETAPE_DIR_READ) { + tape->valid = 0; + if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), + &drive->atapi_flags)) ++count; - while (tape->first_stage != NULL) { - if (count == mt_count) { - if (mt_op == MTFSFM) - set_bit(IDETAPE_FILEMARK, &tape->flags); - return 0; - } - spin_lock_irqsave(&tape->spinlock, flags); - if (tape->first_stage == tape->active_stage) { - /* - * We have reached the active stage in the read pipeline. - * There is no point in allowing the drive to continue - * reading any farther, so we stop the pipeline. - * - * This section should be moved to a separate subroutine, - * because a similar function is performed in - * __idetape_discard_read_pipeline(), for example. - */ - tape->next_stage = NULL; - spin_unlock_irqrestore(&tape->spinlock, flags); - idetape_wait_first_stage(drive); - tape->next_stage = tape->first_stage->next; - } else - spin_unlock_irqrestore(&tape->spinlock, flags); - if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) - ++count; - idetape_remove_stage_head(drive); - } - idetape_discard_read_pipeline(drive, 0); + ide_tape_discard_merge_buffer(drive, 0); } - /* - * The filemark was not found in our internal pipeline. - * Now we can issue the space command. - */ switch (mt_op) { - case MTFSF: - case MTBSF: - idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); - return (idetape_queue_pc_tail(drive, &pc)); - case MTFSFM: - case MTBSFM: - if (!tape->capabilities.sprev) - return (-EIO); - retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); - if (retval) return (retval); - count = (MTBSFM == mt_op ? 1 : -1); - return (idetape_space_over_filemarks(drive, MTFSF, count)); - default: - printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); - return (-EIO); + case MTFSF: + case MTBSF: + idetape_create_space_cmd(&pc, mt_count - count, + IDETAPE_SPACE_OVER_FILEMARK); + return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); + case MTFSFM: + case MTBSFM: + if (!sprev) + return -EIO; + retval = idetape_space_over_filemarks(drive, MTFSF, + mt_count - count); + if (retval) + return retval; + count = (MTBSFM == mt_op ? 1 : -1); + return idetape_space_over_filemarks(drive, MTFSF, count); + default: + printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", + mt_op); + return -EIO; } } - /* - * Our character device read / write functions. + * Our character device read / write functions. * - * The tape is optimized to maximize throughput when it is transferring - * an integral number of the "continuous transfer limit", which is - * a parameter of the specific tape (26 KB on my particular tape). - * (32 kB for Onstream) + * The tape is optimized to maximize throughput when it is transferring an + * integral number of the "continuous transfer limit", which is a parameter of + * the specific tape (26kB on my particular tape, 32kB for Onstream). * - * As of version 1.3 of the driver, the character device provides an - * abstract continuous view of the media - any mix of block sizes (even 1 - * byte) on the same backup/restore procedure is supported. The driver - * will internally convert the requests to the recommended transfer unit, - * so that an unmatch between the user's block size to the recommended - * size will only result in a (slightly) increased driver overhead, but - * will no longer hit performance. - * This is not applicable to Onstream. + * As of version 1.3 of the driver, the character device provides an abstract + * continuous view of the media - any mix of block sizes (even 1 byte) on the + * same backup/restore procedure is supported. The driver will internally + * convert the requests to the recommended transfer unit, so that an unmatch + * between the user's block size to the recommended size will only result in a + * (slightly) increased driver overhead, but will no longer hit performance. + * This is not applicable to Onstream. */ -static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, - size_t count, loff_t *ppos) +static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) { - struct ide_tape_obj *tape = ide_tape_f(file); + struct ide_tape_obj *tape = file->private_data; ide_drive_t *drive = tape->drive; - ssize_t bytes_read,temp, actually_read = 0, rc; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 3) - printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); -#endif /* IDETAPE_DEBUG_LOG */ - - if (tape->chrdev_direction != idetape_direction_read) { - if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) - if (count > tape->tape_block_size && - (count % tape->tape_block_size) == 0) - tape->user_bs_factor = count / tape->tape_block_size; + size_t done = 0; + ssize_t ret = 0; + int rc; + + ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); + + if (tape->chrdev_dir != IDETAPE_DIR_READ) { + if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) + if (count > tape->blk_size && + (count % tape->blk_size) == 0) + tape->user_bs_factor = count / tape->blk_size; } - if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) + + rc = idetape_init_rw(drive, IDETAPE_DIR_READ); + if (rc < 0) return rc; - if (count == 0) - return (0); - if (tape->merge_stage_size) { - actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); - idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read); - buf += actually_read; - tape->merge_stage_size -= actually_read; - count -= actually_read; - } - while (count >= tape->stage_size) { - bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); - if (bytes_read <= 0) - goto finish; - idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read); - buf += bytes_read; - count -= bytes_read; - actually_read += bytes_read; - } - if (count) { - bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); - if (bytes_read <= 0) - goto finish; - temp = min((unsigned long)count, (unsigned long)bytes_read); - idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp); - actually_read += temp; - tape->merge_stage_size = bytes_read-temp; + + while (done < count) { + size_t todo; + + /* refill if staging buffer is empty */ + if (!tape->valid) { + /* If we are at a filemark, nothing more to read */ + if (test_bit(ilog2(IDE_AFLAG_FILEMARK), + &drive->atapi_flags)) + break; + /* read */ + if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, + tape->buffer_size) <= 0) + break; + } + + /* copy out */ + todo = min_t(size_t, count - done, tape->valid); + if (copy_to_user(buf + done, tape->cur, todo)) + ret = -EFAULT; + + tape->cur += todo; + tape->valid -= todo; + done += todo; } -finish: - if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 2) - printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); -#endif + + if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { idetape_space_over_filemarks(drive, MTFSF, 1); return 0; } - return actually_read; + + return ret ? ret : done; } -static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, +static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct ide_tape_obj *tape = ide_tape_f(file); + struct ide_tape_obj *tape = file->private_data; ide_drive_t *drive = tape->drive; - ssize_t retval, actually_written = 0; + size_t done = 0; + ssize_t ret = 0; + int rc; /* The drive is write protected. */ if (tape->write_prot) return -EACCES; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 3) - printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " - "count %Zd\n", count); -#endif /* IDETAPE_DEBUG_LOG */ + ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); /* Initialize write operation */ - if (tape->chrdev_direction != idetape_direction_write) { - if (tape->chrdev_direction == idetape_direction_read) - idetape_discard_read_pipeline(drive, 1); -#if IDETAPE_DEBUG_BUGS - if (tape->merge_stage || tape->merge_stage_size) { - printk(KERN_ERR "ide-tape: merge_stage_size " - "should be 0 now\n"); - tape->merge_stage_size = 0; - } -#endif /* IDETAPE_DEBUG_BUGS */ - if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) - return -ENOMEM; - tape->chrdev_direction = idetape_direction_write; - idetape_init_merge_stage(tape); + rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); + if (rc < 0) + return rc; - /* - * Issue a write 0 command to ensure that DSC handshake - * is switched from completion mode to buffer available - * mode. - * No point in issuing this if DSC overlap isn't supported, - * some drives (Seagate STT3401A) will return an error. - */ - if (drive->dsc_overlap) { - retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); - if (retval < 0) { - __idetape_kfree_stage(tape->merge_stage); - tape->merge_stage = NULL; - tape->chrdev_direction = idetape_direction_none; - return retval; - } - } - } - if (count == 0) - return (0); - if (tape->restart_speed_control_req) - idetape_restart_speed_control(drive); - if (tape->merge_stage_size) { -#if IDETAPE_DEBUG_BUGS - if (tape->merge_stage_size >= tape->stage_size) { - printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); - tape->merge_stage_size = 0; - } -#endif /* IDETAPE_DEBUG_BUGS */ - actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); - idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written); - buf += actually_written; - tape->merge_stage_size += actually_written; - count -= actually_written; - - if (tape->merge_stage_size == tape->stage_size) { - tape->merge_stage_size = 0; - retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); - if (retval <= 0) - return (retval); - } - } - while (count >= tape->stage_size) { - idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size); - buf += tape->stage_size; - count -= tape->stage_size; - retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); - actually_written += tape->stage_size; - if (retval <= 0) - return (retval); - } - if (count) { - actually_written += count; - idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count); - tape->merge_stage_size += count; + while (done < count) { + size_t todo; + + /* flush if staging buffer is full */ + if (tape->valid == tape->buffer_size && + idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, + tape->buffer_size) <= 0) + return rc; + + /* copy in */ + todo = min_t(size_t, count - done, + tape->buffer_size - tape->valid); + if (copy_from_user(tape->cur, buf + done, todo)) + ret = -EFAULT; + + tape->cur += todo; + tape->valid += todo; + done += todo; } - return (actually_written); + + return ret ? ret : done; } -static int idetape_write_filemark (ide_drive_t *drive) +static int idetape_write_filemark(ide_drive_t *drive) { - idetape_pc_t pc; + struct ide_tape_obj *tape = drive->driver_data; + struct ide_atapi_pc pc; /* Write a filemark */ idetape_create_write_filemark_cmd(drive, &pc, 1); - if (idetape_queue_pc_tail(drive, &pc)) { + if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); return -EIO; } @@ -3875,314 +1237,277 @@ static int idetape_write_filemark (ide_drive_t *drive) } /* - * idetape_mtioctop is called from idetape_chrdev_ioctl when - * the general mtio MTIOCTOP ioctl is requested. - * - * We currently support the following mtio.h operations: + * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is + * requested. * - * MTFSF - Space over mt_count filemarks in the positive direction. - * The tape is positioned after the last spaced filemark. + * Note: MTBSF and MTBSFM are not supported when the tape doesn't support + * spacing over filemarks in the reverse direction. In this case, MTFSFM is also + * usually not supported. * - * MTFSFM - Same as MTFSF, but the tape is positioned before the - * last filemark. + * The following commands are currently not supported: * - * MTBSF - Steps background over mt_count filemarks, tape is - * positioned before the last filemark. - * - * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. - * - * Note: - * - * MTBSF and MTBSFM are not supported when the tape doesn't - * support spacing over filemarks in the reverse direction. - * In this case, MTFSFM is also usually not supported (it is - * supported in the rare case in which we crossed the filemark - * during our read-ahead pipelined operation mode). - * - * MTWEOF - Writes mt_count filemarks. Tape is positioned after - * the last written filemark. - * - * MTREW - Rewinds tape. - * - * MTLOAD - Loads the tape. - * - * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and - * MTUNLOAD prevents further access until the media is replaced. - * - * MTNOP - Flushes tape buffers. - * - * MTRETEN - Retension media. This typically consists of one end - * to end pass on the media. - * - * MTEOM - Moves to the end of recorded data. - * - * MTERASE - Erases tape. - * - * MTSETBLK - Sets the user block size to mt_count bytes. If - * mt_count is 0, we will attempt to autodetect - * the block size. - * - * MTSEEK - Positions the tape in a specific block number, where - * each block is assumed to contain which user_block_size - * bytes. - * - * MTSETPART - Switches to another tape partition. - * - * MTLOCK - Locks the tape door. - * - * MTUNLOCK - Unlocks the tape door. - * - * The following commands are currently not supported: - * - * MTFSS, MTBSS, MTWSM, MTSETDENSITY, - * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. + * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, + * MT_ST_WRITE_THRESHOLD. */ -static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) +static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) { idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; - int i,retval; - -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 1) - printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " - "mt_op=%d, mt_count=%d\n", mt_op, mt_count); -#endif /* IDETAPE_DEBUG_LOG */ - /* - * Commands which need our pipelined read-ahead stages. - */ + struct gendisk *disk = tape->disk; + struct ide_atapi_pc pc; + int i, retval; + + ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d", + mt_op, mt_count); + switch (mt_op) { - case MTFSF: - case MTFSFM: - case MTBSF: - case MTBSFM: - if (!mt_count) - return (0); - return (idetape_space_over_filemarks(drive,mt_op,mt_count)); - default: - break; + case MTFSF: + case MTFSFM: + case MTBSF: + case MTBSFM: + if (!mt_count) + return 0; + return idetape_space_over_filemarks(drive, mt_op, mt_count); + default: + break; } + switch (mt_op) { - case MTWEOF: - if (tape->write_prot) - return -EACCES; - idetape_discard_read_pipeline(drive, 1); - for (i = 0; i < mt_count; i++) { - retval = idetape_write_filemark(drive); - if (retval) - return retval; - } - return (0); - case MTREW: - idetape_discard_read_pipeline(drive, 0); - if (idetape_rewind_tape(drive)) + case MTWEOF: + if (tape->write_prot) + return -EACCES; + ide_tape_discard_merge_buffer(drive, 1); + for (i = 0; i < mt_count; i++) { + retval = idetape_write_filemark(drive); + if (retval) + return retval; + } + return 0; + case MTREW: + ide_tape_discard_merge_buffer(drive, 0); + if (idetape_rewind_tape(drive)) + return -EIO; + return 0; + case MTLOAD: + ide_tape_discard_merge_buffer(drive, 0); + return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); + case MTUNLOAD: + case MTOFFL: + /* + * If door is locked, attempt to unlock before + * attempting to eject. + */ + if (tape->door_locked) { + if (!ide_set_media_lock(drive, disk, 0)) + tape->door_locked = DOOR_UNLOCKED; + } + ide_tape_discard_merge_buffer(drive, 0); + retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); + if (!retval) + clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), + &drive->atapi_flags); + return retval; + case MTNOP: + ide_tape_discard_merge_buffer(drive, 0); + return idetape_flush_tape_buffers(drive); + case MTRETEN: + ide_tape_discard_merge_buffer(drive, 0); + return ide_do_start_stop(drive, disk, + IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); + case MTEOM: + idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); + return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); + case MTERASE: + (void)idetape_rewind_tape(drive); + idetape_create_erase_cmd(&pc); + return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); + case MTSETBLK: + if (mt_count) { + if (mt_count < tape->blk_size || + mt_count % tape->blk_size) return -EIO; - return 0; - case MTLOAD: - idetape_discard_read_pipeline(drive, 0); - idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); - return (idetape_queue_pc_tail(drive, &pc)); - case MTUNLOAD: - case MTOFFL: - /* - * If door is locked, attempt to unlock before - * attempting to eject. - */ - if (tape->door_locked) { - if (idetape_create_prevent_cmd(drive, &pc, 0)) - if (!idetape_queue_pc_tail(drive, &pc)) - tape->door_locked = DOOR_UNLOCKED; - } - idetape_discard_read_pipeline(drive, 0); - idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); - retval = idetape_queue_pc_tail(drive, &pc); - if (!retval) - clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); + tape->user_bs_factor = mt_count / tape->blk_size; + clear_bit(ilog2(IDE_AFLAG_DETECT_BS), + &drive->atapi_flags); + } else + set_bit(ilog2(IDE_AFLAG_DETECT_BS), + &drive->atapi_flags); + return 0; + case MTSEEK: + ide_tape_discard_merge_buffer(drive, 0); + return idetape_position_tape(drive, + mt_count * tape->user_bs_factor, tape->partition, 0); + case MTSETPART: + ide_tape_discard_merge_buffer(drive, 0); + return idetape_position_tape(drive, 0, mt_count, 0); + case MTFSR: + case MTBSR: + case MTLOCK: + retval = ide_set_media_lock(drive, disk, 1); + if (retval) return retval; - case MTNOP: - idetape_discard_read_pipeline(drive, 0); - return (idetape_flush_tape_buffers(drive)); - case MTRETEN: - idetape_discard_read_pipeline(drive, 0); - idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); - return (idetape_queue_pc_tail(drive, &pc)); - case MTEOM: - idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); - return (idetape_queue_pc_tail(drive, &pc)); - case MTERASE: - (void) idetape_rewind_tape(drive); - idetape_create_erase_cmd(&pc); - return (idetape_queue_pc_tail(drive, &pc)); - case MTSETBLK: - if (mt_count) { - if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) - return -EIO; - tape->user_bs_factor = mt_count / tape->tape_block_size; - clear_bit(IDETAPE_DETECT_BS, &tape->flags); - } else - set_bit(IDETAPE_DETECT_BS, &tape->flags); - return 0; - case MTSEEK: - idetape_discard_read_pipeline(drive, 0); - return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); - case MTSETPART: - idetape_discard_read_pipeline(drive, 0); - return (idetape_position_tape(drive, 0, mt_count, 0)); - case MTFSR: - case MTBSR: - case MTLOCK: - if (!idetape_create_prevent_cmd(drive, &pc, 1)) - return 0; - retval = idetape_queue_pc_tail(drive, &pc); - if (retval) return retval; - tape->door_locked = DOOR_EXPLICITLY_LOCKED; - return 0; - case MTUNLOCK: - if (!idetape_create_prevent_cmd(drive, &pc, 0)) - return 0; - retval = idetape_queue_pc_tail(drive, &pc); - if (retval) return retval; - tape->door_locked = DOOR_UNLOCKED; - return 0; - default: - printk(KERN_ERR "ide-tape: MTIO operation %d not " - "supported\n", mt_op); - return (-EIO); + tape->door_locked = DOOR_EXPLICITLY_LOCKED; + return 0; + case MTUNLOCK: + retval = ide_set_media_lock(drive, disk, 0); + if (retval) + return retval; + tape->door_locked = DOOR_UNLOCKED; + return 0; + default: + printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", + mt_op); + return -EIO; } } /* - * Our character device ioctls. - * - * General mtio.h magnetic io commands are supported here, and not in - * the corresponding block interface. - * - * The following ioctls are supported: - * - * MTIOCTOP - Refer to idetape_mtioctop for detailed description. - * - * MTIOCGET - The mt_dsreg field in the returned mtget structure - * will be set to (user block size in bytes << - * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. - * - * The mt_blkno is set to the current user block number. - * The other mtget fields are not supported. - * - * MTIOCPOS - The current tape "block position" is returned. We - * assume that each block contains user_block_size - * bytes. - * - * Our own ide-tape ioctls are supported on both interfaces. + * Our character device ioctls. General mtio.h magnetic io commands are + * supported here, and not in the corresponding block interface. Our own + * ide-tape ioctls are supported on both interfaces. */ -static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +static long do_idetape_chrdev_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) { - struct ide_tape_obj *tape = ide_tape_f(file); + struct ide_tape_obj *tape = file->private_data; ide_drive_t *drive = tape->drive; struct mtop mtop; struct mtget mtget; struct mtpos mtpos; - int block_offset = 0, position = tape->first_frame_position; + int block_offset = 0, position = tape->first_frame; void __user *argp = (void __user *)arg; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 3) - printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " - "cmd=%u\n", cmd); -#endif /* IDETAPE_DEBUG_LOG */ + ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd); - tape->restart_speed_control_req = 1; - if (tape->chrdev_direction == idetape_direction_write) { - idetape_empty_write_pipeline(drive); + if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { + ide_tape_flush_merge_buffer(drive); idetape_flush_tape_buffers(drive); } if (cmd == MTIOCGET || cmd == MTIOCPOS) { - block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); - if ((position = idetape_read_position(drive)) < 0) + block_offset = tape->valid / + (tape->blk_size * tape->user_bs_factor); + position = ide_tape_read_position(drive); + if (position < 0) return -EIO; } switch (cmd) { - case MTIOCTOP: - if (copy_from_user(&mtop, argp, sizeof (struct mtop))) - return -EFAULT; - return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); - case MTIOCGET: - memset(&mtget, 0, sizeof (struct mtget)); - mtget.mt_type = MT_ISSCSI2; - mtget.mt_blkno = position / tape->user_bs_factor - block_offset; - mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; - if (tape->drv_write_prot) { - mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); - } - if (copy_to_user(argp, &mtget, sizeof(struct mtget))) - return -EFAULT; - return 0; - case MTIOCPOS: - mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; - if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) - return -EFAULT; - return 0; - default: - if (tape->chrdev_direction == idetape_direction_read) - idetape_discard_read_pipeline(drive, 1); - return idetape_blkdev_ioctl(drive, cmd, arg); + case MTIOCTOP: + if (copy_from_user(&mtop, argp, sizeof(struct mtop))) + return -EFAULT; + return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); + case MTIOCGET: + memset(&mtget, 0, sizeof(struct mtget)); + mtget.mt_type = MT_ISSCSI2; + mtget.mt_blkno = position / tape->user_bs_factor - block_offset; + mtget.mt_dsreg = + ((tape->blk_size * tape->user_bs_factor) + << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; + + if (tape->drv_write_prot) + mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); + + if (copy_to_user(argp, &mtget, sizeof(struct mtget))) + return -EFAULT; + return 0; + case MTIOCPOS: + mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; + if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) + return -EFAULT; + return 0; + default: + if (tape->chrdev_dir == IDETAPE_DIR_READ) + ide_tape_discard_merge_buffer(drive, 1); + return idetape_blkdev_ioctl(drive, cmd, arg); } } -static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); +static long idetape_chrdev_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + long ret; + mutex_lock(&ide_tape_mutex); + ret = do_idetape_chrdev_ioctl(file, cmd, arg); + mutex_unlock(&ide_tape_mutex); + return ret; +} /* - * Our character device open function. + * Do a mode sense page 0 with block descriptor and if it succeeds set the tape + * block size with the reported value. */ -static int idetape_chrdev_open (struct inode *inode, struct file *filp) +static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) +{ + idetape_tape_t *tape = drive->driver_data; + struct ide_atapi_pc pc; + u8 buf[12]; + + idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); + if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { + printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); + if (tape->blk_size == 0) { + printk(KERN_WARNING "ide-tape: Cannot deal with zero " + "block size, assuming 32k\n"); + tape->blk_size = 32768; + } + return; + } + tape->blk_size = (buf[4 + 5] << 16) + + (buf[4 + 6] << 8) + + buf[4 + 7]; + tape->drv_write_prot = (buf[2] & 0x80) >> 7; + + ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d", + tape->blk_size, tape->drv_write_prot); +} + +static int idetape_chrdev_open(struct inode *inode, struct file *filp) { unsigned int minor = iminor(inode), i = minor & ~0xc0; ide_drive_t *drive; idetape_tape_t *tape; - idetape_pc_t pc; int retval; - /* - * We really want to do nonseekable_open(inode, filp); here, but some - * versions of tar incorrectly call lseek on tapes and bail out if that - * fails. So we disallow pread() and pwrite(), but permit lseeks. - */ - filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); - -#if IDETAPE_DEBUG_LOG - printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); -#endif /* IDETAPE_DEBUG_LOG */ - if (i >= MAX_HWIFS * MAX_DRIVES) return -ENXIO; - if (!(tape = ide_tape_chrdev_get(i))) + mutex_lock(&idetape_chrdev_mutex); + + tape = ide_tape_get(NULL, true, i); + if (!tape) { + mutex_unlock(&idetape_chrdev_mutex); return -ENXIO; + } drive = tape->drive; - filp->private_data = tape; - if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { + ide_debug_log(IDE_DBG_FUNC, "enter"); + + /* + * We really want to do nonseekable_open(inode, filp); here, but some + * versions of tar incorrectly call lseek on tapes and bail out if that + * fails. So we disallow pread() and pwrite(), but permit lseeks. + */ + filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); + + + if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { retval = -EBUSY; goto out_put_tape; } retval = idetape_wait_ready(drive, 60 * HZ); if (retval) { - clear_bit(IDETAPE_BUSY, &tape->flags); + clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); goto out_put_tape; } - idetape_read_position(drive); - if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) + ide_tape_read_position(drive); + if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) (void)idetape_rewind_tape(drive); - if (tape->chrdev_direction != idetape_direction_read) - clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); - /* Read block size and write protect status from drive. */ - idetape_get_blocksize_from_block_descriptor(drive); + ide_tape_get_bsize_from_bdesc(drive); /* Set write protect flag if device is opened as read-only. */ if ((filp->f_flags & O_ACCMODE) == O_RDONLY) @@ -4194,557 +1519,365 @@ static int idetape_chrdev_open (struct inode *inode, struct file *filp) if (tape->write_prot) { if ((filp->f_flags & O_ACCMODE) == O_WRONLY || (filp->f_flags & O_ACCMODE) == O_RDWR) { - clear_bit(IDETAPE_BUSY, &tape->flags); + clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); retval = -EROFS; goto out_put_tape; } } - /* - * Lock the tape drive door so user can't eject. - */ - if (tape->chrdev_direction == idetape_direction_none) { - if (idetape_create_prevent_cmd(drive, &pc, 1)) { - if (!idetape_queue_pc_tail(drive, &pc)) { - if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) - tape->door_locked = DOOR_LOCKED; - } + /* Lock the tape drive door so user can't eject. */ + if (tape->chrdev_dir == IDETAPE_DIR_NONE) { + if (!ide_set_media_lock(drive, tape->disk, 1)) { + if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) + tape->door_locked = DOOR_LOCKED; } } - idetape_restart_speed_control(drive); - tape->restart_speed_control_req = 0; + mutex_unlock(&idetape_chrdev_mutex); + return 0; out_put_tape: ide_tape_put(tape); + + mutex_unlock(&idetape_chrdev_mutex); + return retval; } -static void idetape_write_release (ide_drive_t *drive, unsigned int minor) +static void idetape_write_release(ide_drive_t *drive, unsigned int minor) { idetape_tape_t *tape = drive->driver_data; - idetape_empty_write_pipeline(drive); - tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); - if (tape->merge_stage != NULL) { - idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); - __idetape_kfree_stage(tape->merge_stage); - tape->merge_stage = NULL; + ide_tape_flush_merge_buffer(drive); + tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); + if (tape->buf != NULL) { + idetape_pad_zeros(drive, tape->blk_size * + (tape->user_bs_factor - 1)); + kfree(tape->buf); + tape->buf = NULL; } idetape_write_filemark(drive); idetape_flush_tape_buffers(drive); idetape_flush_tape_buffers(drive); } -/* - * Our character device release function. - */ -static int idetape_chrdev_release (struct inode *inode, struct file *filp) +static int idetape_chrdev_release(struct inode *inode, struct file *filp) { - struct ide_tape_obj *tape = ide_tape_f(filp); + struct ide_tape_obj *tape = filp->private_data; ide_drive_t *drive = tape->drive; - idetape_pc_t pc; unsigned int minor = iminor(inode); - lock_kernel(); + mutex_lock(&idetape_chrdev_mutex); + tape = drive->driver_data; -#if IDETAPE_DEBUG_LOG - if (tape->debug_level >= 3) - printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); -#endif /* IDETAPE_DEBUG_LOG */ - if (tape->chrdev_direction == idetape_direction_write) + ide_debug_log(IDE_DBG_FUNC, "enter"); + + if (tape->chrdev_dir == IDETAPE_DIR_WRITE) idetape_write_release(drive, minor); - if (tape->chrdev_direction == idetape_direction_read) { + if (tape->chrdev_dir == IDETAPE_DIR_READ) { if (minor < 128) - idetape_discard_read_pipeline(drive, 1); - else - idetape_wait_for_pipeline(drive); - } - if (tape->cache_stage != NULL) { - __idetape_kfree_stage(tape->cache_stage); - tape->cache_stage = NULL; + ide_tape_discard_merge_buffer(drive, 1); } - if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) + + if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), + &drive->atapi_flags)) (void) idetape_rewind_tape(drive); - if (tape->chrdev_direction == idetape_direction_none) { + + if (tape->chrdev_dir == IDETAPE_DIR_NONE) { if (tape->door_locked == DOOR_LOCKED) { - if (idetape_create_prevent_cmd(drive, &pc, 0)) { - if (!idetape_queue_pc_tail(drive, &pc)) - tape->door_locked = DOOR_UNLOCKED; - } + if (!ide_set_media_lock(drive, tape->disk, 0)) + tape->door_locked = DOOR_UNLOCKED; } } - clear_bit(IDETAPE_BUSY, &tape->flags); + clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); ide_tape_put(tape); - unlock_kernel(); - return 0; -} - -/* - * idetape_identify_device is called to check the contents of the - * ATAPI IDENTIFY command results. We return: - * - * 1 If the tape can be supported by us, based on the information - * we have so far. - * - * 0 If this tape driver is not currently supported by us. - */ -static int idetape_identify_device (ide_drive_t *drive) -{ - struct idetape_id_gcw gcw; - struct hd_driveid *id = drive->id; -#if IDETAPE_DEBUG_INFO - unsigned short mask,i; -#endif /* IDETAPE_DEBUG_INFO */ - - if (drive->id_read == 0) - return 1; - - *((unsigned short *) &gcw) = id->config; - -#if IDETAPE_DEBUG_INFO - printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); - printk(KERN_INFO "ide-tape: Protocol Type: "); - switch (gcw.protocol) { - case 0: case 1: printk("ATA\n");break; - case 2: printk("ATAPI\n");break; - case 3: printk("Reserved (Unknown to ide-tape)\n");break; - } - printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); - switch (gcw.device_type) { - case 0: printk("Direct-access Device\n");break; - case 1: printk("Streaming Tape Device\n");break; - case 2: case 3: case 4: printk("Reserved\n");break; - case 5: printk("CD-ROM Device\n");break; - case 6: printk("Reserved\n"); - case 7: printk("Optical memory Device\n");break; - case 0x1f: printk("Unknown or no Device type\n");break; - default: printk("Reserved\n"); - } - printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); - printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); - switch (gcw.drq_type) { - case 0: printk("Microprocessor DRQ\n");break; - case 1: printk("Interrupt DRQ\n");break; - case 2: printk("Accelerated DRQ\n");break; - case 3: printk("Reserved\n");break; - } - printk(KERN_INFO "ide-tape: Command Packet Size: "); - switch (gcw.packet_size) { - case 0: printk("12 bytes\n");break; - case 1: printk("16 bytes\n");break; - default: printk("Reserved\n");break; - } - printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model); - printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); - printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); - printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); - printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); - printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); - printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); - printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); - printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); - printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); - printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); - printk(KERN_INFO "ide-tape: Single Word DMA supported modes: "); - for (i=0,mask=1;i<8;i++,mask=mask << 1) { - if (id->dma_1word & mask) - printk("%d ",i); - if (id->dma_1word & (mask << 8)) - printk("(active) "); - } - printk("\n"); - printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: "); - for (i=0,mask=1;i<8;i++,mask=mask << 1) { - if (id->dma_mword & mask) - printk("%d ",i); - if (id->dma_mword & (mask << 8)) - printk("(active) "); - } - printk("\n"); - if (id->field_valid & 0x0002) { - printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n", - id->eide_pio_modes & 1 ? "Mode 3":"None"); - printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); - if (id->eide_dma_min == 0) - printk("Not supported\n"); - else - printk("%d ns\n",id->eide_dma_min); - - printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); - if (id->eide_dma_time == 0) - printk("Not supported\n"); - else - printk("%d ns\n",id->eide_dma_time); - printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); - if (id->eide_pio == 0) - printk("Not supported\n"); - else - printk("%d ns\n",id->eide_pio); + mutex_unlock(&idetape_chrdev_mutex); - printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); - if (id->eide_pio_iordy == 0) - printk("Not supported\n"); - else - printk("%d ns\n",id->eide_pio_iordy); - - } else - printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); -#endif /* IDETAPE_DEBUG_INFO */ - - /* Check that we can support this device */ - - if (gcw.protocol !=2 ) - printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); - else if (gcw.device_type != 1) - printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); - else if (!gcw.removable) - printk(KERN_ERR "ide-tape: The removable flag is not set\n"); - else if (gcw.packet_size != 0) { - printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); - if (gcw.packet_size == 1) - printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); - } else - return 1; return 0; } -/* - * Use INQUIRY to get the firmware revision - */ -static void idetape_get_inquiry_results (ide_drive_t *drive) +static void idetape_get_inquiry_results(ide_drive_t *drive) { - char *r; idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; - idetape_inquiry_result_t *inquiry; - + struct ide_atapi_pc pc; + u8 pc_buf[256]; + char fw_rev[4], vendor_id[8], product_id[16]; + idetape_create_inquiry_cmd(&pc); - if (idetape_queue_pc_tail(drive, &pc)) { - printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); + if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { + printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", + tape->name); return; } - inquiry = (idetape_inquiry_result_t *) pc.buffer; - memcpy(tape->vendor_id, inquiry->vendor_id, 8); - memcpy(tape->product_id, inquiry->product_id, 16); - memcpy(tape->firmware_revision, inquiry->revision_level, 4); - ide_fixstring(tape->vendor_id, 10, 0); - ide_fixstring(tape->product_id, 18, 0); - ide_fixstring(tape->firmware_revision, 6, 0); - r = tape->firmware_revision; - if (*(r + 1) == '.') - tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; - printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision); + memcpy(vendor_id, &pc_buf[8], 8); + memcpy(product_id, &pc_buf[16], 16); + memcpy(fw_rev, &pc_buf[32], 4); + + ide_fixstring(vendor_id, 8, 0); + ide_fixstring(product_id, 16, 0); + ide_fixstring(fw_rev, 4, 0); + + printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", + drive->name, tape->name, vendor_id, product_id, fw_rev); } /* - * idetape_get_mode_sense_results asks the tape about its various - * parameters. In particular, we will adjust our data transfer buffer - * size to the recommended value as returned by the tape. + * Ask the tape about its various parameters. In particular, we will adjust our + * data transfer buffer size to the recommended value as returned by the tape. */ -static void idetape_get_mode_sense_results (ide_drive_t *drive) +static void idetape_get_mode_sense_results(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; - idetape_mode_parameter_header_t *header; - idetape_capabilities_page_t *capabilities; - + struct ide_atapi_pc pc; + u8 buf[24], *caps; + u8 speed, max_speed; + idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); - if (idetape_queue_pc_tail(drive, &pc)) { - printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); - tape->tape_block_size = 512; - tape->capabilities.ctl = 52; - tape->capabilities.speed = 450; - tape->capabilities.buffer_size = 6 * 52; + if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { + printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" + " some default values\n"); + tape->blk_size = 512; + put_unaligned(52, (u16 *)&tape->caps[12]); + put_unaligned(540, (u16 *)&tape->caps[14]); + put_unaligned(6*52, (u16 *)&tape->caps[16]); return; } - header = (idetape_mode_parameter_header_t *) pc.buffer; - capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); + caps = buf + 4 + buf[3]; + + /* convert to host order and save for later use */ + speed = be16_to_cpup((__be16 *)&caps[14]); + max_speed = be16_to_cpup((__be16 *)&caps[8]); - capabilities->max_speed = ntohs(capabilities->max_speed); - capabilities->ctl = ntohs(capabilities->ctl); - capabilities->speed = ntohs(capabilities->speed); - capabilities->buffer_size = ntohs(capabilities->buffer_size); + *(u16 *)&caps[8] = max_speed; + *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); + *(u16 *)&caps[14] = speed; + *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); - if (!capabilities->speed) { - printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); - capabilities->speed = 650; + if (!speed) { + printk(KERN_INFO "ide-tape: %s: invalid tape speed " + "(assuming 650KB/sec)\n", drive->name); + *(u16 *)&caps[14] = 650; } - if (!capabilities->max_speed) { - printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); - capabilities->max_speed = 650; + if (!max_speed) { + printk(KERN_INFO "ide-tape: %s: invalid max_speed " + "(assuming 650KB/sec)\n", drive->name); + *(u16 *)&caps[8] = 650; } - tape->capabilities = *capabilities; /* Save us a copy */ - if (capabilities->blk512) - tape->tape_block_size = 512; - else if (capabilities->blk1024) - tape->tape_block_size = 1024; - -#if IDETAPE_DEBUG_INFO - printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); - printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); - printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); - printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); - printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); - printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); - - printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); - printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); - printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); - printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); - printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); - printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); - printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); - printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); - printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); - printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); -#endif /* IDETAPE_DEBUG_INFO */ -} + memcpy(&tape->caps, caps, 20); -/* - * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor - * and if it succeeds sets the tape block size with the reported value - */ -static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) -{ + /* device lacks locking support according to capabilities page */ + if ((caps[6] & 1) == 0) + drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; - idetape_tape_t *tape = drive->driver_data; - idetape_pc_t pc; - idetape_mode_parameter_header_t *header; - idetape_parameter_block_descriptor_t *block_descrp; - - idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); - if (idetape_queue_pc_tail(drive, &pc)) { - printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); - if (tape->tape_block_size == 0) { - printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); - tape->tape_block_size = 32768; - } - return; - } - header = (idetape_mode_parameter_header_t *) pc.buffer; - block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); - tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; - tape->drv_write_prot = (header->dsp & 0x80) >> 7; - -#if IDETAPE_DEBUG_INFO - printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); -#endif /* IDETAPE_DEBUG_INFO */ + if (caps[7] & 0x02) + tape->blk_size = 512; + else if (caps[7] & 0x04) + tape->blk_size = 1024; } -static void idetape_add_settings (ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; -/* - * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function - */ - ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); - ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); - ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); - ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); - ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); - ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); - ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); - ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); - ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); - ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); - ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); - ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL); - ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); - ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); +#ifdef CONFIG_IDE_PROC_FS +#define ide_tape_devset_get(name, field) \ +static int get_##name(ide_drive_t *drive) \ +{ \ + idetape_tape_t *tape = drive->driver_data; \ + return tape->field; \ } +#define ide_tape_devset_set(name, field) \ +static int set_##name(ide_drive_t *drive, int arg) \ +{ \ + idetape_tape_t *tape = drive->driver_data; \ + tape->field = arg; \ + return 0; \ +} + +#define ide_tape_devset_rw_field(_name, _field) \ +ide_tape_devset_get(_name, _field) \ +ide_tape_devset_set(_name, _field) \ +IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) + +#define ide_tape_devset_r_field(_name, _field) \ +ide_tape_devset_get(_name, _field) \ +IDE_DEVSET(_name, 0, get_##_name, NULL) + +static int mulf_tdsc(ide_drive_t *drive) { return 1000; } +static int divf_tdsc(ide_drive_t *drive) { return HZ; } +static int divf_buffer(ide_drive_t *drive) { return 2; } +static int divf_buffer_size(ide_drive_t *drive) { return 1024; } + +ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); + +ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); + +ide_tape_devset_r_field(avg_speed, avg_speed); +ide_tape_devset_r_field(speed, caps[14]); +ide_tape_devset_r_field(buffer, caps[16]); +ide_tape_devset_r_field(buffer_size, buffer_size); + +static const struct ide_proc_devset idetape_settings[] = { + __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), + __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), + __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), + __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), + __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), + __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, + mulf_tdsc, divf_tdsc), + { NULL }, +}; +#endif + /* - * ide_setup is called to: + * The function below is called to: * - * 1. Initialize our various state variables. - * 2. Ask the tape for its capabilities. - * 3. Allocate a buffer which will be used for data - * transfer. The buffer size is chosen based on - * the recommendation which we received in step (2). + * 1. Initialize our various state variables. + * 2. Ask the tape for its capabilities. + * 3. Allocate a buffer which will be used for data transfer. The buffer size + * is chosen based on the recommendation which we received in step 2. * - * Note that at this point ide.c already assigned us an irq, so that - * we can queue requests here and wait for their completion. + * Note that at this point ide.c already assigned us an irq, so that we can + * queue requests here and wait for their completion. */ -static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) +static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) { - unsigned long t1, tmid, tn, t; + unsigned long t; int speed; - struct idetape_id_gcw gcw; - int stage_size; - struct sysinfo si; - - spin_lock_init(&tape->spinlock); - drive->dsc_overlap = 1; -#ifdef CONFIG_BLK_DEV_IDEPCI - if (HWIF(drive)->pci_dev != NULL) { - /* - * These two ide-pci host adapters appear to need DSC overlap disabled. - * This probably needs further analysis. - */ - if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || - (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { - printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); - drive->dsc_overlap = 0; - } + int buffer_size; + u16 *ctl = (u16 *)&tape->caps[12]; + + ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor); + + drive->pc_callback = ide_tape_callback; + + drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; + + if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { + printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", + tape->name); + drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; } -#endif /* CONFIG_BLK_DEV_IDEPCI */ + /* Seagate Travan drives do not support DSC overlap. */ - if (strstr(drive->id->model, "Seagate STT3401")) - drive->dsc_overlap = 0; + if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) + drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; + tape->minor = minor; tape->name[0] = 'h'; tape->name[1] = 't'; tape->name[2] = '0' + minor; - tape->chrdev_direction = idetape_direction_none; - tape->pc = tape->pc_stack; - tape->max_insert_speed = 10000; - tape->speed_control = 1; - *((unsigned short *) &gcw) = drive->id->config; - if (gcw.drq_type == 1) - set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); - - tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; - + tape->chrdev_dir = IDETAPE_DIR_NONE; + idetape_get_inquiry_results(drive); idetape_get_mode_sense_results(drive); - idetape_get_blocksize_from_block_descriptor(drive); + ide_tape_get_bsize_from_bdesc(drive); tape->user_bs_factor = 1; - tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; - while (tape->stage_size > 0xffff) { + tape->buffer_size = *ctl * tape->blk_size; + while (tape->buffer_size > 0xffff) { printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); - tape->capabilities.ctl /= 2; - tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; - } - stage_size = tape->stage_size; - tape->pages_per_stage = stage_size / PAGE_SIZE; - if (stage_size % PAGE_SIZE) { - tape->pages_per_stage++; - tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; + *ctl /= 2; + tape->buffer_size = *ctl * tape->blk_size; } + buffer_size = tape->buffer_size; - /* - * Select the "best" DSC read/write polling frequency - * and pipeline size. - */ - speed = max(tape->capabilities.speed, tape->capabilities.max_speed); + /* select the "best" DSC read/write polling freq */ + speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); - tape->max_stages = speed * 1000 * 10 / tape->stage_size; + t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); /* - * Limit memory use for pipeline to 10% of physical memory + * Ensure that the number we got makes sense; limit it within + * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. */ - si_meminfo(&si); - if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) - tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); - tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); - tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); - tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); - if (tape->max_stages == 0) - tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; - - t1 = (tape->stage_size * HZ) / (speed * 1000); - tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); - tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); - - if (tape->max_stages) - t = tn; - else - t = t1; - - /* - * Ensure that the number we got makes sense; limit - * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. - */ - tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); + tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, + IDETAPE_DSC_RW_MAX); printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " - "%dkB pipeline, %lums tDSC%s\n", - drive->name, tape->name, tape->capabilities.speed, - (tape->capabilities.buffer_size * 512) / tape->stage_size, - tape->stage_size / 1024, - tape->max_stages * tape->stage_size / 1024, - tape->best_dsc_rw_frequency * 1000 / HZ, - drive->using_dma ? ", DMA":""); - - idetape_add_settings(drive); + "%lums tDSC%s\n", + drive->name, tape->name, *(u16 *)&tape->caps[14], + (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, + tape->buffer_size / 1024, + tape->best_dsc_rw_freq * 1000 / HZ, + (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); + + ide_proc_register_driver(drive, tape->driver); } static void ide_tape_remove(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - ide_unregister_subdriver(drive, tape->driver); - + ide_proc_unregister_driver(drive, tape->driver); + device_del(&tape->dev); ide_unregister_region(tape->disk); - ide_tape_put(tape); + mutex_lock(&idetape_ref_mutex); + put_device(&tape->dev); + mutex_unlock(&idetape_ref_mutex); } -static void ide_tape_release(struct kref *kref) +static void ide_tape_release(struct device *dev) { - struct ide_tape_obj *tape = to_ide_tape(kref); + struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); ide_drive_t *drive = tape->drive; struct gendisk *g = tape->disk; - BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); + BUG_ON(tape->valid); - drive->dsc_overlap = 0; + drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; drive->driver_data = NULL; - class_device_destroy(idetape_sysfs_class, - MKDEV(IDETAPE_MAJOR, tape->minor)); - class_device_destroy(idetape_sysfs_class, + device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); + device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); - devfs_remove("%s/mt", drive->devfs_name); - devfs_remove("%s/mtn", drive->devfs_name); - devfs_unregister_tape(g->number); idetape_devs[tape->minor] = NULL; g->private_data = NULL; put_disk(g); kfree(tape); } -#ifdef CONFIG_PROC_FS - -static int proc_idetape_read_name - (char *page, char **start, off_t off, int count, int *eof, void *data) +#ifdef CONFIG_IDE_PROC_FS +static int idetape_name_proc_show(struct seq_file *m, void *v) { - ide_drive_t *drive = (ide_drive_t *) data; + ide_drive_t *drive = (ide_drive_t *) m->private; idetape_tape_t *tape = drive->driver_data; - char *out = page; - int len; - len = sprintf(out, "%s\n", tape->name); - PROC_IDE_READ_RETURN(page, start, off, count, eof, len); + seq_printf(m, "%s\n", tape->name); + return 0; } -static ide_proc_entry_t idetape_proc[] = { - { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, - { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, - { NULL, 0, NULL, NULL } +static int idetape_name_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, idetape_name_proc_show, PDE_DATA(inode)); +} + +static const struct file_operations idetape_name_proc_fops = { + .owner = THIS_MODULE, + .open = idetape_name_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, }; -#else +static ide_proc_entry_t idetape_proc[] = { + { "capacity", S_IFREG|S_IRUGO, &ide_capacity_proc_fops }, + { "name", S_IFREG|S_IRUGO, &idetape_name_proc_fops }, + {} +}; -#define idetape_proc NULL +static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) +{ + return idetape_proc; +} +static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) +{ + return idetape_settings; +} #endif static int ide_tape_probe(ide_drive_t *); -static ide_driver_t idetape_driver = { +static struct ide_driver idetape_driver = { .gen_driver = { .owner = THIS_MODULE, .name = "ide-tape", @@ -4753,69 +1886,64 @@ static ide_driver_t idetape_driver = { .probe = ide_tape_probe, .remove = ide_tape_remove, .version = IDETAPE_VERSION, - .media = ide_tape, - .supports_dsc_overlap = 1, .do_request = idetape_do_request, - .end_request = idetape_end_request, - .error = __ide_error, - .abort = __ide_abort, - .proc = idetape_proc, +#ifdef CONFIG_IDE_PROC_FS + .proc_entries = ide_tape_proc_entries, + .proc_devsets = ide_tape_proc_devsets, +#endif }; -/* - * Our character device supporting functions, passed to register_chrdev. - */ -static struct file_operations idetape_fops = { +/* Our character device supporting functions, passed to register_chrdev. */ +static const struct file_operations idetape_fops = { .owner = THIS_MODULE, .read = idetape_chrdev_read, .write = idetape_chrdev_write, - .ioctl = idetape_chrdev_ioctl, + .unlocked_ioctl = idetape_chrdev_ioctl, .open = idetape_chrdev_open, .release = idetape_chrdev_release, + .llseek = noop_llseek, }; -static int idetape_open(struct inode *inode, struct file *filp) +static int idetape_open(struct block_device *bdev, fmode_t mode) { - struct gendisk *disk = inode->i_bdev->bd_disk; struct ide_tape_obj *tape; - ide_drive_t *drive; - - if (!(tape = ide_tape_get(disk))) - return -ENXIO; - drive = tape->drive; + mutex_lock(&ide_tape_mutex); + tape = ide_tape_get(bdev->bd_disk, false, 0); + mutex_unlock(&ide_tape_mutex); - drive->usage++; + if (!tape) + return -ENXIO; return 0; } -static int idetape_release(struct inode *inode, struct file *filp) +static void idetape_release(struct gendisk *disk, fmode_t mode) { - struct gendisk *disk = inode->i_bdev->bd_disk; - struct ide_tape_obj *tape = ide_tape_g(disk); - ide_drive_t *drive = tape->drive; - - drive->usage--; + struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); + mutex_lock(&ide_tape_mutex); ide_tape_put(tape); - - return 0; + mutex_unlock(&ide_tape_mutex); } -static int idetape_ioctl(struct inode *inode, struct file *file, +static int idetape_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { - struct block_device *bdev = inode->i_bdev; - struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); + struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); ide_drive_t *drive = tape->drive; - int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); + int err; + + mutex_lock(&ide_tape_mutex); + err = generic_ide_ioctl(drive, bdev, cmd, arg); if (err == -EINVAL) err = idetape_blkdev_ioctl(drive, cmd, arg); + mutex_unlock(&ide_tape_mutex); + return err; } -static struct block_device_operations idetape_block_ops = { +static const struct block_device_operations idetape_block_ops = { .owner = THIS_MODULE, .open = idetape_open, .release = idetape_release, @@ -4828,27 +1956,24 @@ static int ide_tape_probe(ide_drive_t *drive) struct gendisk *g; int minor; - if (!strstr("ide-tape", drive->driver_req)) - goto failed; - if (!drive->present) + ide_debug_log(IDE_DBG_FUNC, "enter"); + + if (!strstr(DRV_NAME, drive->driver_req)) goto failed; + if (drive->media != ide_tape) goto failed; - if (!idetape_identify_device (drive)) { - printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); - goto failed; - } - if (drive->scsi) { - printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); + + if ((drive->dev_flags & IDE_DFLAG_ID_READ) && + ide_check_atapi_device(drive, DRV_NAME) == 0) { + printk(KERN_ERR "ide-tape: %s: not supported by this version of" + " the driver\n", drive->name); goto failed; } - if (strstr(drive->id->model, "OnStream DI-")) { - printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); - printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); - } - tape = (idetape_tape_t *) kzalloc (sizeof (idetape_tape_t), GFP_KERNEL); + tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); if (tape == NULL) { - printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); + printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", + drive->name); goto failed; } @@ -4858,9 +1983,12 @@ static int ide_tape_probe(ide_drive_t *drive) ide_init_disk(g, drive); - ide_register_subdriver(drive, &idetape_driver); + tape->dev.parent = &drive->gendev; + tape->dev.release = ide_tape_release; + dev_set_name(&tape->dev, "%s", dev_name(&drive->gendev)); - kref_init(&tape->kref); + if (device_register(&tape->dev)) + goto out_free_disk; tape->drive = drive; tape->driver = &idetape_driver; @@ -4870,42 +1998,34 @@ static int ide_tape_probe(ide_drive_t *drive) drive->driver_data = tape; - down(&idetape_ref_sem); + mutex_lock(&idetape_ref_mutex); for (minor = 0; idetape_devs[minor]; minor++) ; idetape_devs[minor] = tape; - up(&idetape_ref_sem); + mutex_unlock(&idetape_ref_mutex); idetape_setup(drive, tape, minor); - class_device_create(idetape_sysfs_class, NULL, - MKDEV(IDETAPE_MAJOR, minor), &drive->gendev, "%s", tape->name); - class_device_create(idetape_sysfs_class, NULL, - MKDEV(IDETAPE_MAJOR, minor + 128), &drive->gendev, "n%s", tape->name); + device_create(idetape_sysfs_class, &drive->gendev, + MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); + device_create(idetape_sysfs_class, &drive->gendev, + MKDEV(IDETAPE_MAJOR, minor + 128), NULL, + "n%s", tape->name); - devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor), - S_IFCHR | S_IRUGO | S_IWUGO, - "%s/mt", drive->devfs_name); - devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor + 128), - S_IFCHR | S_IRUGO | S_IWUGO, - "%s/mtn", drive->devfs_name); - - g->number = devfs_register_tape(drive->devfs_name); g->fops = &idetape_block_ops; ide_register_region(g); return 0; +out_free_disk: + put_disk(g); out_free_tape: kfree(tape); failed: return -ENODEV; } -MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); -MODULE_LICENSE("GPL"); - -static void __exit idetape_exit (void) +static void __exit idetape_exit(void) { driver_unregister(&idetape_driver.gen_driver); class_destroy(idetape_sysfs_class); @@ -4924,7 +2044,8 @@ static int __init idetape_init(void) } if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { - printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); + printk(KERN_ERR "ide-tape: Failed to register chrdev" + " interface\n"); error = -EBUSY; goto out_free_class; } @@ -4947,3 +2068,5 @@ MODULE_ALIAS("ide:*m-tape*"); module_init(idetape_init); module_exit(idetape_exit); MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); +MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); +MODULE_LICENSE("GPL"); |