diff options
Diffstat (limited to 'drivers/scsi/aic7xxx/aic7xxx_osm.c')
| -rw-r--r-- | drivers/scsi/aic7xxx/aic7xxx_osm.c | 5043 |
1 files changed, 5043 insertions, 0 deletions
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c new file mode 100644 index 00000000000..031c6aaa5ca --- /dev/null +++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c @@ -0,0 +1,5043 @@ +/* + * Adaptec AIC7xxx device driver for Linux. + * + * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $ + * + * Copyright (c) 1994 John Aycock + * The University of Calgary Department of Computer Science. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F + * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA + * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide, + * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux, + * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file + * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual, + * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the + * ANSI SCSI-2 specification (draft 10c), ... + * + * -------------------------------------------------------------------------- + * + * Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org): + * + * Substantially modified to include support for wide and twin bus + * adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes, + * SCB paging, and other rework of the code. + * + * -------------------------------------------------------------------------- + * Copyright (c) 1994-2000 Justin T. Gibbs. + * Copyright (c) 2000-2001 Adaptec Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + * + *--------------------------------------------------------------------------- + * + * Thanks also go to (in alphabetical order) the following: + * + * Rory Bolt - Sequencer bug fixes + * Jay Estabrook - Initial DEC Alpha support + * Doug Ledford - Much needed abort/reset bug fixes + * Kai Makisara - DMAing of SCBs + * + * A Boot time option was also added for not resetting the scsi bus. + * + * Form: aic7xxx=extended + * aic7xxx=no_reset + * aic7xxx=verbose + * + * Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97 + * + * Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp + */ + +/* + * Further driver modifications made by Doug Ledford <dledford@redhat.com> + * + * Copyright (c) 1997-1999 Doug Ledford + * + * These changes are released under the same licensing terms as the FreeBSD + * driver written by Justin Gibbs. Please see his Copyright notice above + * for the exact terms and conditions covering my changes as well as the + * warranty statement. + * + * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include + * but are not limited to: + * + * 1: Import of the latest FreeBSD sequencer code for this driver + * 2: Modification of kernel code to accommodate different sequencer semantics + * 3: Extensive changes throughout kernel portion of driver to improve + * abort/reset processing and error hanndling + * 4: Other work contributed by various people on the Internet + * 5: Changes to printk information and verbosity selection code + * 6: General reliability related changes, especially in IRQ management + * 7: Modifications to the default probe/attach order for supported cards + * 8: SMP friendliness has been improved + * + */ + +#include "aic7xxx_osm.h" +#include "aic7xxx_inline.h" +#include <scsi/scsicam.h> + +/* + * Include aiclib.c as part of our + * "module dependencies are hard" work around. + */ +#include "aiclib.c" + +#include <linux/init.h> /* __setup */ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) +#include "sd.h" /* For geometry detection */ +#endif + +#include <linux/mm.h> /* For fetching system memory size */ +#include <linux/blkdev.h> /* For block_size() */ +#include <linux/delay.h> /* For ssleep/msleep */ + +/* + * Lock protecting manipulation of the ahc softc list. + */ +spinlock_t ahc_list_spinlock; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) +/* For dynamic sglist size calculation. */ +u_int ahc_linux_nseg; +#endif + +/* + * Set this to the delay in seconds after SCSI bus reset. + * Note, we honor this only for the initial bus reset. + * The scsi error recovery code performs its own bus settle + * delay handling for error recovery actions. + */ +#ifdef CONFIG_AIC7XXX_RESET_DELAY_MS +#define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS +#else +#define AIC7XXX_RESET_DELAY 5000 +#endif + +/* + * Control collection of SCSI transfer statistics for the /proc filesystem. + * + * NOTE: Do NOT enable this when running on kernels version 1.2.x and below. + * NOTE: This does affect performance since it has to maintain statistics. + */ +#ifdef CONFIG_AIC7XXX_PROC_STATS +#define AIC7XXX_PROC_STATS +#endif + +/* + * To change the default number of tagged transactions allowed per-device, + * add a line to the lilo.conf file like: + * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}" + * which will result in the first four devices on the first two + * controllers being set to a tagged queue depth of 32. + * + * The tag_commands is an array of 16 to allow for wide and twin adapters. + * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15 + * for channel 1. + */ +typedef struct { + uint8_t tag_commands[16]; /* Allow for wide/twin adapters. */ +} adapter_tag_info_t; + +/* + * Modify this as you see fit for your system. + * + * 0 tagged queuing disabled + * 1 <= n <= 253 n == max tags ever dispatched. + * + * The driver will throttle the number of commands dispatched to a + * device if it returns queue full. For devices with a fixed maximum + * queue depth, the driver will eventually determine this depth and + * lock it in (a console message is printed to indicate that a lock + * has occurred). On some devices, queue full is returned for a temporary + * resource shortage. These devices will return queue full at varying + * depths. The driver will throttle back when the queue fulls occur and + * attempt to slowly increase the depth over time as the device recovers + * from the resource shortage. + * + * In this example, the first line will disable tagged queueing for all + * the devices on the first probed aic7xxx adapter. + * + * The second line enables tagged queueing with 4 commands/LUN for IDs + * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the + * driver to attempt to use up to 64 tags for ID 1. + * + * The third line is the same as the first line. + * + * The fourth line disables tagged queueing for devices 0 and 3. It + * enables tagged queueing for the other IDs, with 16 commands/LUN + * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for + * IDs 2, 5-7, and 9-15. + */ + +/* + * NOTE: The below structure is for reference only, the actual structure + * to modify in order to change things is just below this comment block. +adapter_tag_info_t aic7xxx_tag_info[] = +{ + {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, + {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}}, + {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, + {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}} +}; +*/ + +#ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE +#define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE +#else +#define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE +#endif + +#define AIC7XXX_CONFIGED_TAG_COMMANDS { \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE \ +} + +/* + * By default, use the number of commands specified by + * the users kernel configuration. + */ +static adapter_tag_info_t aic7xxx_tag_info[] = +{ + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS} +}; + +/* + * DV option: + * + * positive value = DV Enabled + * zero = DV Disabled + * negative value = DV Default for adapter type/seeprom + */ +#ifdef CONFIG_AIC7XXX_DV_SETTING +#define AIC7XXX_CONFIGED_DV CONFIG_AIC7XXX_DV_SETTING +#else +#define AIC7XXX_CONFIGED_DV -1 +#endif + +static int8_t aic7xxx_dv_settings[] = +{ + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV +}; + +/* + * There should be a specific return value for this in scsi.h, but + * it seems that most drivers ignore it. + */ +#define DID_UNDERFLOW DID_ERROR + +void +ahc_print_path(struct ahc_softc *ahc, struct scb *scb) +{ + printk("(scsi%d:%c:%d:%d): ", + ahc->platform_data->host->host_no, + scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X', + scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1, + scb != NULL ? SCB_GET_LUN(scb) : -1); +} + +/* + * XXX - these options apply unilaterally to _all_ 274x/284x/294x + * cards in the system. This should be fixed. Exceptions to this + * rule are noted in the comments. + */ + +/* + * Skip the scsi bus reset. Non 0 make us skip the reset at startup. This + * has no effect on any later resets that might occur due to things like + * SCSI bus timeouts. + */ +static uint32_t aic7xxx_no_reset; + +/* + * Certain PCI motherboards will scan PCI devices from highest to lowest, + * others scan from lowest to highest, and they tend to do all kinds of + * strange things when they come into contact with PCI bridge chips. The + * net result of all this is that the PCI card that is actually used to boot + * the machine is very hard to detect. Most motherboards go from lowest + * PCI slot number to highest, and the first SCSI controller found is the + * one you boot from. The only exceptions to this are when a controller + * has its BIOS disabled. So, we by default sort all of our SCSI controllers + * from lowest PCI slot number to highest PCI slot number. We also force + * all controllers with their BIOS disabled to the end of the list. This + * works on *almost* all computers. Where it doesn't work, we have this + * option. Setting this option to non-0 will reverse the order of the sort + * to highest first, then lowest, but will still leave cards with their BIOS + * disabled at the very end. That should fix everyone up unless there are + * really strange cirumstances. + */ +static uint32_t aic7xxx_reverse_scan; + +/* + * Should we force EXTENDED translation on a controller. + * 0 == Use whatever is in the SEEPROM or default to off + * 1 == Use whatever is in the SEEPROM or default to on + */ +static uint32_t aic7xxx_extended; + +/* + * PCI bus parity checking of the Adaptec controllers. This is somewhat + * dubious at best. To my knowledge, this option has never actually + * solved a PCI parity problem, but on certain machines with broken PCI + * chipset configurations where stray PCI transactions with bad parity are + * the norm rather than the exception, the error messages can be overwelming. + * It's included in the driver for completeness. + * 0 = Shut off PCI parity check + * non-0 = reverse polarity pci parity checking + */ +static uint32_t aic7xxx_pci_parity = ~0; + +/* + * Certain newer motherboards have put new PCI based devices into the + * IO spaces that used to typically be occupied by VLB or EISA cards. + * This overlap can cause these newer motherboards to lock up when scanned + * for older EISA and VLB devices. Setting this option to non-0 will + * cause the driver to skip scanning for any VLB or EISA controllers and + * only support the PCI controllers. NOTE: this means that if the kernel + * os compiled with PCI support disabled, then setting this to non-0 + * would result in never finding any devices :) + */ +#ifndef CONFIG_AIC7XXX_PROBE_EISA_VL +uint32_t aic7xxx_probe_eisa_vl; +#else +uint32_t aic7xxx_probe_eisa_vl = ~0; +#endif + +/* + * There are lots of broken chipsets in the world. Some of them will + * violate the PCI spec when we issue byte sized memory writes to our + * controller. I/O mapped register access, if allowed by the given + * platform, will work in almost all cases. + */ +uint32_t aic7xxx_allow_memio = ~0; + +/* + * aic7xxx_detect() has been run, so register all device arrivals + * immediately with the system rather than deferring to the sorted + * attachment performed by aic7xxx_detect(). + */ +int aic7xxx_detect_complete; + +/* + * So that we can set how long each device is given as a selection timeout. + * The table of values goes like this: + * 0 - 256ms + * 1 - 128ms + * 2 - 64ms + * 3 - 32ms + * We default to 256ms because some older devices need a longer time + * to respond to initial selection. + */ +static uint32_t aic7xxx_seltime; + +/* + * Certain devices do not perform any aging on commands. Should the + * device be saturated by commands in one portion of the disk, it is + * possible for transactions on far away sectors to never be serviced. + * To handle these devices, we can periodically send an ordered tag to + * force all outstanding transactions to be serviced prior to a new + * transaction. + */ +uint32_t aic7xxx_periodic_otag; + +/* + * Module information and settable options. + */ +static char *aic7xxx = NULL; + +MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>"); +MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(AIC7XXX_DRIVER_VERSION); +module_param(aic7xxx, charp, 0444); +MODULE_PARM_DESC(aic7xxx, +"period delimited, options string.\n" +" verbose Enable verbose/diagnostic logging\n" +" allow_memio Allow device registers to be memory mapped\n" +" debug Bitmask of debug values to enable\n" +" no_probe Toggle EISA/VLB controller probing\n" +" probe_eisa_vl Toggle EISA/VLB controller probing\n" +" no_reset Supress initial bus resets\n" +" extended Enable extended geometry on all controllers\n" +" periodic_otag Send an ordered tagged transaction\n" +" periodically to prevent tag starvation.\n" +" This may be required by some older disk\n" +" drives or RAID arrays.\n" +" reverse_scan Sort PCI devices highest Bus/Slot to lowest\n" +" tag_info:<tag_str> Set per-target tag depth\n" +" global_tag_depth:<int> Global tag depth for every target\n" +" on every bus\n" +" dv:<dv_settings> Set per-controller Domain Validation Setting.\n" +" seltime:<int> Selection Timeout\n" +" (0/256ms,1/128ms,2/64ms,3/32ms)\n" +"\n" +" Sample /etc/modprobe.conf line:\n" +" Toggle EISA/VLB probing\n" +" Set tag depth on Controller 1/Target 1 to 10 tags\n" +" Shorten the selection timeout to 128ms\n" +"\n" +" options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n" +); + +static void ahc_linux_handle_scsi_status(struct ahc_softc *, + struct ahc_linux_device *, + struct scb *); +static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, + Scsi_Cmnd *cmd); +static void ahc_linux_filter_inquiry(struct ahc_softc*, struct ahc_devinfo*); +static void ahc_linux_sem_timeout(u_long arg); +static void ahc_linux_freeze_simq(struct ahc_softc *ahc); +static void ahc_linux_release_simq(u_long arg); +static void ahc_linux_dev_timed_unfreeze(u_long arg); +static int ahc_linux_queue_recovery_cmd(Scsi_Cmnd *cmd, scb_flag flag); +static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc); +static void ahc_linux_size_nseg(void); +static void ahc_linux_thread_run_complete_queue(struct ahc_softc *ahc); +static void ahc_linux_start_dv(struct ahc_softc *ahc); +static void ahc_linux_dv_timeout(struct scsi_cmnd *cmd); +static int ahc_linux_dv_thread(void *data); +static void ahc_linux_kill_dv_thread(struct ahc_softc *ahc); +static void ahc_linux_dv_target(struct ahc_softc *ahc, u_int target); +static void ahc_linux_dv_transition(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_fill_cmd(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo); +static void ahc_linux_dv_inq(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ, + u_int request_length); +static void ahc_linux_dv_tur(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo); +static void ahc_linux_dv_rebd(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_web(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_reb(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_su(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static int ahc_linux_fallback(struct ahc_softc *ahc, + struct ahc_devinfo *devinfo); +static void ahc_linux_dv_complete(Scsi_Cmnd *cmd); +static void ahc_linux_generate_dv_pattern(struct ahc_linux_target *targ); +static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc, + struct ahc_devinfo *devinfo); +static u_int ahc_linux_user_dv_setting(struct ahc_softc *ahc); +static void ahc_linux_device_queue_depth(struct ahc_softc *ahc, + struct ahc_linux_device *dev); +static struct ahc_linux_target* ahc_linux_alloc_target(struct ahc_softc*, + u_int, u_int); +static void ahc_linux_free_target(struct ahc_softc*, + struct ahc_linux_target*); +static struct ahc_linux_device* ahc_linux_alloc_device(struct ahc_softc*, + struct ahc_linux_target*, + u_int); +static void ahc_linux_free_device(struct ahc_softc*, + struct ahc_linux_device*); +static void ahc_linux_run_device_queue(struct ahc_softc*, + struct ahc_linux_device*); +static void ahc_linux_setup_tag_info_global(char *p); +static aic_option_callback_t ahc_linux_setup_tag_info; +static aic_option_callback_t ahc_linux_setup_dv; +static int aic7xxx_setup(char *s); +static int ahc_linux_next_unit(void); +static void ahc_runq_tasklet(unsigned long data); +static struct ahc_cmd *ahc_linux_run_complete_queue(struct ahc_softc *ahc); + +/********************************* Inlines ************************************/ +static __inline void ahc_schedule_runq(struct ahc_softc *ahc); +static __inline struct ahc_linux_device* + ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, + u_int target, u_int lun, int alloc); +static __inline void ahc_schedule_completeq(struct ahc_softc *ahc); +static __inline void ahc_linux_check_device_queue(struct ahc_softc *ahc, + struct ahc_linux_device *dev); +static __inline struct ahc_linux_device * + ahc_linux_next_device_to_run(struct ahc_softc *ahc); +static __inline void ahc_linux_run_device_queues(struct ahc_softc *ahc); +static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*); + +static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb, + struct ahc_dma_seg *sg, + dma_addr_t addr, bus_size_t len); + +static __inline void +ahc_schedule_completeq(struct ahc_softc *ahc) +{ + if ((ahc->platform_data->flags & AHC_RUN_CMPLT_Q_TIMER) == 0) { + ahc->platform_data->flags |= AHC_RUN_CMPLT_Q_TIMER; + ahc->platform_data->completeq_timer.expires = jiffies; + add_timer(&ahc->platform_data->completeq_timer); + } +} + +/* + * Must be called with our lock held. + */ +static __inline void +ahc_schedule_runq(struct ahc_softc *ahc) +{ + tasklet_schedule(&ahc->platform_data->runq_tasklet); +} + +static __inline struct ahc_linux_device* +ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, u_int target, + u_int lun, int alloc) +{ + struct ahc_linux_target *targ; + struct ahc_linux_device *dev; + u_int target_offset; + + target_offset = target; + if (channel != 0) + target_offset += 8; + targ = ahc->platform_data->targets[target_offset]; + if (targ == NULL) { + if (alloc != 0) { + targ = ahc_linux_alloc_target(ahc, channel, target); + if (targ == NULL) + return (NULL); + } else + return (NULL); + } + dev = targ->devices[lun]; + if (dev == NULL && alloc != 0) + dev = ahc_linux_alloc_device(ahc, targ, lun); + return (dev); +} + +#define AHC_LINUX_MAX_RETURNED_ERRORS 4 +static struct ahc_cmd * +ahc_linux_run_complete_queue(struct ahc_softc *ahc) +{ + struct ahc_cmd *acmd; + u_long done_flags; + int with_errors; + + with_errors = 0; + ahc_done_lock(ahc, &done_flags); + while ((acmd = TAILQ_FIRST(&ahc->platform_data->completeq)) != NULL) { + Scsi_Cmnd *cmd; + + if (with_errors > AHC_LINUX_MAX_RETURNED_ERRORS) { + /* + * Linux uses stack recursion to requeue + * commands that need to be retried. Avoid + * blowing out the stack by "spoon feeding" + * commands that completed with error back + * the operating system in case they are going + * to be retried. "ick" + */ + ahc_schedule_completeq(ahc); + break; + } + TAILQ_REMOVE(&ahc->platform_data->completeq, + acmd, acmd_links.tqe); + cmd = &acmd_scsi_cmd(acmd); + cmd->host_scribble = NULL; + if (ahc_cmd_get_transaction_status(cmd) != DID_OK + || (cmd->result & 0xFF) != SCSI_STATUS_OK) + with_errors++; + + cmd->scsi_done(cmd); + } + ahc_done_unlock(ahc, &done_flags); + return (acmd); +} + +static __inline void +ahc_linux_check_device_queue(struct ahc_softc *ahc, + struct ahc_linux_device *dev) +{ + if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) != 0 + && dev->active == 0) { + dev->flags &= ~AHC_DEV_FREEZE_TIL_EMPTY; + dev->qfrozen--; + } + + if (TAILQ_FIRST(&dev->busyq) == NULL + || dev->openings == 0 || dev->qfrozen != 0) + return; + + ahc_linux_run_device_queue(ahc, dev); +} + +static __inline struct ahc_linux_device * +ahc_linux_next_device_to_run(struct ahc_softc *ahc) +{ + + if ((ahc->flags & AHC_RESOURCE_SHORTAGE) != 0 + || (ahc->platform_data->qfrozen != 0 + && AHC_DV_SIMQ_FROZEN(ahc) == 0)) + return (NULL); + return (TAILQ_FIRST(&ahc->platform_data->device_runq)); +} + +static __inline void +ahc_linux_run_device_queues(struct ahc_softc *ahc) +{ + struct ahc_linux_device *dev; + + while ((dev = ahc_linux_next_device_to_run(ahc)) != NULL) { + TAILQ_REMOVE(&ahc->platform_data->device_runq, dev, links); + dev->flags &= ~AHC_DEV_ON_RUN_LIST; + ahc_linux_check_device_queue(ahc, dev); + } +} + +static __inline void +ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb) +{ + Scsi_Cmnd *cmd; + + cmd = scb->io_ctx; + ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE); + if (cmd->use_sg != 0) { + struct scatterlist *sg; + + sg = (struct scatterlist *)cmd->request_buffer; + pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg, + scsi_to_pci_dma_dir(cmd->sc_data_direction)); + } else if (cmd->request_bufflen != 0) { + pci_unmap_single(ahc->dev_softc, + scb->platform_data->buf_busaddr, + cmd->request_bufflen, + scsi_to_pci_dma_dir(cmd->sc_data_direction)); + } +} + +static __inline int +ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb, + struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len) +{ + int consumed; + + if ((scb->sg_count + 1) > AHC_NSEG) + panic("Too few segs for dma mapping. " + "Increase AHC_NSEG\n"); + + consumed = 1; + sg->addr = ahc_htole32(addr & 0xFFFFFFFF); + scb->platform_data->xfer_len += len; + + if (sizeof(dma_addr_t) > 4 + && (ahc->flags & AHC_39BIT_ADDRESSING) != 0) + len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK; + + sg->len = ahc_htole32(len); + return (consumed); +} + +/************************ Host template entry points *************************/ +static int ahc_linux_detect(Scsi_Host_Template *); +static int ahc_linux_queue(Scsi_Cmnd *, void (*)(Scsi_Cmnd *)); +static const char *ahc_linux_info(struct Scsi_Host *); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) +static int ahc_linux_slave_alloc(Scsi_Device *); +static int ahc_linux_slave_configure(Scsi_Device *); +static void ahc_linux_slave_destroy(Scsi_Device *); +#if defined(__i386__) +static int ahc_linux_biosparam(struct scsi_device*, + struct block_device*, + sector_t, int[]); +#endif +#else +static int ahc_linux_release(struct Scsi_Host *); +static void ahc_linux_select_queue_depth(struct Scsi_Host *host, + Scsi_Device *scsi_devs); +#if defined(__i386__) +static int ahc_linux_biosparam(Disk *, kdev_t, int[]); +#endif +#endif +static int ahc_linux_bus_reset(Scsi_Cmnd *); +static int ahc_linux_dev_reset(Scsi_Cmnd *); +static int ahc_linux_abort(Scsi_Cmnd *); + +/* + * Calculate a safe value for AHC_NSEG (as expressed through ahc_linux_nseg). + * + * In pre-2.5.X... + * The midlayer allocates an S/G array dynamically when a command is issued + * using SCSI malloc. This array, which is in an OS dependent format that + * must later be copied to our private S/G list, is sized to house just the + * number of segments needed for the current transfer. Since the code that + * sizes the SCSI malloc pool does not take into consideration fragmentation + * of the pool, executing transactions numbering just a fraction of our + * concurrent transaction limit with list lengths aproaching AHC_NSEG will + * quickly depleat the SCSI malloc pool of usable space. Unfortunately, the + * mid-layer does not properly handle this scsi malloc failures for the S/G + * array and the result can be a lockup of the I/O subsystem. We try to size + * our S/G list so that it satisfies our drivers allocation requirements in + * addition to avoiding fragmentation of the SCSI malloc pool. + */ +static void +ahc_linux_size_nseg(void) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + u_int cur_size; + u_int best_size; + + /* + * The SCSI allocator rounds to the nearest 512 bytes + * an cannot allocate across a page boundary. Our algorithm + * is to start at 1K of scsi malloc space per-command and + * loop through all factors of the PAGE_SIZE and pick the best. + */ + best_size = 0; + for (cur_size = 1024; cur_size <= PAGE_SIZE; cur_size *= 2) { + u_int nseg; + + nseg = cur_size / sizeof(struct scatterlist); + if (nseg < AHC_LINUX_MIN_NSEG) + continue; + + if (best_size == 0) { + best_size = cur_size; + ahc_linux_nseg = nseg; + } else { + u_int best_rem; + u_int cur_rem; + + /* + * Compare the traits of the current "best_size" + * with the current size to determine if the + * current size is a better size. + */ + best_rem = best_size % sizeof(struct scatterlist); + cur_rem = cur_size % sizeof(struct scatterlist); + if (cur_rem < best_rem) { + best_size = cur_size; + ahc_linux_nseg = nseg; + } + } + } +#endif +} + +/* + * Try to detect an Adaptec 7XXX controller. + */ +static int +ahc_linux_detect(Scsi_Host_Template *template) +{ + struct ahc_softc *ahc; + int found = 0; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + /* + * It is a bug that the upper layer takes + * this lock just prior to calling us. + */ + spin_unlock_irq(&io_request_lock); +#endif + + /* + * Sanity checking of Linux SCSI data structures so + * that some of our hacks^H^H^H^H^Hassumptions aren't + * violated. + */ + if (offsetof(struct ahc_cmd_internal, end) + > offsetof(struct scsi_cmnd, host_scribble)) { + printf("ahc_linux_detect: SCSI data structures changed.\n"); + printf("ahc_linux_detect: Unable to attach\n"); + return (0); + } + ahc_linux_size_nseg(); + /* + * If we've been passed any parameters, process them now. + */ + if (aic7xxx) + aic7xxx_setup(aic7xxx); + + template->proc_name = "aic7xxx"; + + /* + * Initialize our softc list lock prior to + * probing for any adapters. + */ + ahc_list_lockinit(); + + found = ahc_linux_pci_init(); + if (!ahc_linux_eisa_init()) + found++; + + /* + * Register with the SCSI layer all + * controllers we've found. + */ + TAILQ_FOREACH(ahc, &ahc_tailq, links) { + + if (ahc_linux_register_host(ahc, template) == 0) + found++; + } + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + spin_lock_irq(&io_request_lock); +#endif + aic7xxx_detect_complete++; + + return (found); +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) +/* + * Free the passed in Scsi_Host memory structures prior to unloading the + * module. + */ +int +ahc_linux_release(struct Scsi_Host * host) +{ + struct ahc_softc *ahc; + u_long l; + + ahc_list_lock(&l); + if (host != NULL) { + + /* + * We should be able to just perform + * the free directly, but check our + * list for extra sanity. + */ + ahc = ahc_find_softc(*(struct ahc_softc **)host->hostdata); + if (ahc != NULL) { + u_long s; + + ahc_lock(ahc, &s); + ahc_intr_enable(ahc, FALSE); + ahc_unlock(ahc, &s); + ahc_free(ahc); + } + } + ahc_list_unlock(&l); + return (0); +} +#endif + +/* + * Return a string describing the driver. + */ +static const char * +ahc_linux_info(struct Scsi_Host *host) +{ + static char buffer[512]; + char ahc_info[256]; + char *bp; + struct ahc_softc *ahc; + + bp = &buffer[0]; + ahc = *(struct ahc_softc **)host->hostdata; + memset(bp, 0, sizeof(buffer)); + strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev "); + strcat(bp, AIC7XXX_DRIVER_VERSION); + strcat(bp, "\n"); + strcat(bp, " <"); + strcat(bp, ahc->description); + strcat(bp, ">\n"); + strcat(bp, " "); + ahc_controller_info(ahc, ahc_info); + strcat(bp, ahc_info); + strcat(bp, "\n"); + + return (bp); +} + +/* + * Queue an SCB to the controller. + */ +static int +ahc_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *)) +{ + struct ahc_softc *ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = *(struct ahc_softc **)cmd->device->host->hostdata; + + /* + * Save the callback on completion function. + */ + cmd->scsi_done = scsi_done; + + ahc_midlayer_entrypoint_lock(ahc, &flags); + + /* + * Close the race of a command that was in the process of + * being queued to us just as our simq was frozen. Let + * DV commands through so long as we are only frozen to + * perform DV. + */ + if (ahc->platform_data->qfrozen != 0 + && AHC_DV_CMD(cmd) == 0) { + + ahc_cmd_set_transaction_status(cmd, CAM_REQUEUE_REQ); + ahc_linux_queue_cmd_complete(ahc, cmd); + ahc_schedule_completeq(ahc); + ahc_midlayer_entrypoint_unlock(ahc, &flags); + return (0); + } + dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id, + cmd->device->lun, /*alloc*/TRUE); + if (dev == NULL) { + ahc_cmd_set_transaction_status(cmd, CAM_RESRC_UNAVAIL); + ahc_linux_queue_cmd_complete(ahc, cmd); + ahc_schedule_completeq(ahc); + ahc_midlayer_entrypoint_unlock(ahc, &flags); + printf("%s: aic7xxx_linux_queue - Unable to allocate device!\n", + ahc_name(ahc)); + return (0); + } + cmd->result = CAM_REQ_INPROG << 16; + TAILQ_INSERT_TAIL(&dev->busyq, (struct ahc_cmd *)cmd, acmd_links.tqe); + if ((dev->flags & AHC_DEV_ON_RUN_LIST) == 0) { + TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, dev, links); + dev->flags |= AHC_DEV_ON_RUN_LIST; + ahc_linux_run_device_queues(ahc); + } + ahc_midlayer_entrypoint_unlock(ahc, &flags); + return (0); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) +static int +ahc_linux_slave_alloc(Scsi_Device *device) +{ + struct ahc_softc *ahc; + + ahc = *((struct ahc_softc **)device->host->hostdata); + if (bootverbose) + printf("%s: Slave Alloc %d\n", ahc_name(ahc), device->id); + return (0); +} + +static int +ahc_linux_slave_configure(Scsi_Device *device) +{ + struct ahc_softc *ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = *((struct ahc_softc **)device->host->hostdata); + if (bootverbose) + printf("%s: Slave Configure %d\n", ahc_name(ahc), device->id); + ahc_midlayer_entrypoint_lock(ahc, &flags); + /* + * Since Linux has attached to the device, configure + * it so we don't free and allocate the device + * structure on every command. + */ + dev = ahc_linux_get_device(ahc, device->channel, + device->id, device->lun, + /*alloc*/TRUE); + if (dev != NULL) { + dev->flags &= ~AHC_DEV_UNCONFIGURED; + dev->scsi_device = device; + ahc_linux_device_queue_depth(ahc, dev); + } + ahc_midlayer_entrypoint_unlock(ahc, &flags); + return (0); +} + +static void +ahc_linux_slave_destroy(Scsi_Device *device) +{ + struct ahc_softc *ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = *((struct ahc_softc **)device->host->hostdata); + if (bootverbose) + printf("%s: Slave Destroy %d\n", ahc_name(ahc), device->id); + ahc_midlayer_entrypoint_lock(ahc, &flags); + dev = ahc_linux_get_device(ahc, device->channel, + device->id, device->lun, + /*alloc*/FALSE); + /* + * Filter out "silly" deletion |