diff options
Diffstat (limited to 'drivers/scsi/ide-scsi.c')
| -rw-r--r-- | drivers/scsi/ide-scsi.c | 1197 |
1 files changed, 0 insertions, 1197 deletions
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c deleted file mode 100644 index f04f3289938..00000000000 --- a/drivers/scsi/ide-scsi.c +++ /dev/null @@ -1,1197 +0,0 @@ -/* - * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999 - * - * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il> - */ - -/* - * Emulation of a SCSI host adapter for IDE ATAPI devices. - * - * With this driver, one can use the Linux SCSI drivers instead of the - * native IDE ATAPI drivers. - * - * Ver 0.1 Dec 3 96 Initial version. - * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation - * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks - * to Janos Farkas for pointing this out. - * Avoid using bitfields in structures for m68k. - * Added Scatter/Gather and DMA support. - * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives. - * Use variable timeout for each command. - * Ver 0.5 Jan 2 98 Fix previous PD/CD support. - * Allow disabling of SCSI-6 to SCSI-10 transformation. - * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer - * for access through /dev/sg. - * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation. - * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple - * detection of devices with CONFIG_SCSI_MULTI_LUN - * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7. - * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM. - * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms - * Ver 0.92 Dec 31 02 Implement new SCSI mid level API - */ - -#define IDESCSI_VERSION "0.92" - -#include <linux/module.h> -#include <linux/config.h> -#include <linux/types.h> -#include <linux/string.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/ioport.h> -#include <linux/blkdev.h> -#include <linux/errno.h> -#include <linux/hdreg.h> -#include <linux/slab.h> -#include <linux/ide.h> -#include <linux/scatterlist.h> -#include <linux/delay.h> - -#include <asm/io.h> -#include <asm/bitops.h> -#include <asm/uaccess.h> - -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_host.h> -#include <scsi/scsi_tcq.h> -#include <scsi/sg.h> - -#define IDESCSI_DEBUG_LOG 0 - -typedef struct idescsi_pc_s { - u8 c[12]; /* Actual packet bytes */ - int request_transfer; /* Bytes to transfer */ - int actually_transferred; /* Bytes actually transferred */ - int buffer_size; /* Size of our data buffer */ - struct request *rq; /* The corresponding request */ - u8 *buffer; /* Data buffer */ - u8 *current_position; /* Pointer into the above buffer */ - struct scatterlist *sg; /* Scatter gather table */ - int b_count; /* Bytes transferred from current entry */ - struct scsi_cmnd *scsi_cmd; /* SCSI command */ - void (*done)(struct scsi_cmnd *); /* Scsi completion routine */ - unsigned long flags; /* Status/Action flags */ - unsigned long timeout; /* Command timeout */ -} idescsi_pc_t; - -/* - * Packet command status bits. - */ -#define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */ -#define PC_WRITING 1 /* Data direction */ -#define PC_TRANSFORM 2 /* transform SCSI commands */ -#define PC_TIMEDOUT 3 /* command timed out */ -#define PC_DMA_OK 4 /* Use DMA */ - -/* - * SCSI command transformation layer - */ -#define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */ -#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */ - -/* - * Log flags - */ -#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */ - -typedef struct ide_scsi_obj { - ide_drive_t *drive; - ide_driver_t *driver; - struct gendisk *disk; - struct Scsi_Host *host; - - idescsi_pc_t *pc; /* Current packet command */ - unsigned long flags; /* Status/Action flags */ - unsigned long transform; /* SCSI cmd translation layer */ - unsigned long log; /* log flags */ -} idescsi_scsi_t; - -static DECLARE_MUTEX(idescsi_ref_sem); - -#define ide_scsi_g(disk) \ - container_of((disk)->private_data, struct ide_scsi_obj, driver) - -static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk) -{ - struct ide_scsi_obj *scsi = NULL; - - down(&idescsi_ref_sem); - scsi = ide_scsi_g(disk); - if (scsi) - scsi_host_get(scsi->host); - up(&idescsi_ref_sem); - return scsi; -} - -static void ide_scsi_put(struct ide_scsi_obj *scsi) -{ - down(&idescsi_ref_sem); - scsi_host_put(scsi->host); - up(&idescsi_ref_sem); -} - -static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host) -{ - return (idescsi_scsi_t*) (&host[1]); -} - -static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive) -{ - return scsihost_to_idescsi(ide_drive->driver_data); -} - -/* - * Per ATAPI device status bits. - */ -#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */ - -/* - * ide-scsi requests. - */ -#define IDESCSI_PC_RQ 90 - -static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount) -{ - while (bcount--) - (void) HWIF(drive)->INB(IDE_DATA_REG); -} - -static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount) -{ - while (bcount--) - HWIF(drive)->OUTB(0, IDE_DATA_REG); -} - -/* - * PIO data transfer routines using the scatter gather table. - */ -static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) -{ - int count; - char *buf; - - while (bcount) { - if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { - printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n"); - idescsi_discard_data (drive, bcount); - return; - } - count = min(pc->sg->length - pc->b_count, bcount); - if (PageHighMem(pc->sg->page)) { - unsigned long flags; - - local_irq_save(flags); - buf = kmap_atomic(pc->sg->page, KM_IRQ0) + - pc->sg->offset; - drive->hwif->atapi_input_bytes(drive, - buf + pc->b_count, count); - kunmap_atomic(buf - pc->sg->offset, KM_IRQ0); - local_irq_restore(flags); - } else { - buf = page_address(pc->sg->page) + pc->sg->offset; - drive->hwif->atapi_input_bytes(drive, - buf + pc->b_count, count); - } - bcount -= count; pc->b_count += count; - if (pc->b_count == pc->sg->length) { - pc->sg++; - pc->b_count = 0; - } - } -} - -static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) -{ - int count; - char *buf; - - while (bcount) { - if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { - printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n"); - idescsi_output_zeros (drive, bcount); - return; - } - count = min(pc->sg->length - pc->b_count, bcount); - if (PageHighMem(pc->sg->page)) { - unsigned long flags; - - local_irq_save(flags); - buf = kmap_atomic(pc->sg->page, KM_IRQ0) + - pc->sg->offset; - drive->hwif->atapi_output_bytes(drive, - buf + pc->b_count, count); - kunmap_atomic(buf - pc->sg->offset, KM_IRQ0); - local_irq_restore(flags); - } else { - buf = page_address(pc->sg->page) + pc->sg->offset; - drive->hwif->atapi_output_bytes(drive, - buf + pc->b_count, count); - } - bcount -= count; pc->b_count += count; - if (pc->b_count == pc->sg->length) { - pc->sg++; - pc->b_count = 0; - } - } -} - -/* - * Most of the SCSI commands are supported directly by ATAPI devices. - * idescsi_transform_pc handles the few exceptions. - */ -static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc) -{ - u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd; - char *atapi_buf; - - if (!test_bit(PC_TRANSFORM, &pc->flags)) - return; - if (drive->media == ide_cdrom || drive->media == ide_optical) { - if (c[0] == READ_6 || c[0] == WRITE_6) { - c[8] = c[4]; c[5] = c[3]; c[4] = c[2]; - c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0; - c[0] += (READ_10 - READ_6); - } - if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) { - unsigned short new_len; - if (!scsi_buf) - return; - if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL) - return; - memset(atapi_buf, 0, pc->buffer_size + 4); - memset (c, 0, 12); - c[0] = sc[0] | 0x40; - c[1] = sc[1]; - c[2] = sc[2]; - new_len = sc[4] + 4; - c[8] = new_len; - c[7] = new_len >> 8; - c[9] = sc[5]; - if (c[0] == MODE_SELECT_10) { - atapi_buf[1] = scsi_buf[0]; /* Mode data length */ - atapi_buf[2] = scsi_buf[1]; /* Medium type */ - atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */ - atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */ - memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4); - } - pc->buffer = atapi_buf; - pc->request_transfer += 4; - pc->buffer_size += 4; - } - } -} - -static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc) -{ - u8 *atapi_buf = pc->buffer; - u8 *sc = pc->scsi_cmd->cmnd; - u8 *scsi_buf = pc->scsi_cmd->request_buffer; - - if (!test_bit(PC_TRANSFORM, &pc->flags)) - return; - if (drive->media == ide_cdrom || drive->media == ide_optical) { - if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) { - scsi_buf[0] = atapi_buf[1]; /* Mode data length */ - scsi_buf[1] = atapi_buf[2]; /* Medium type */ - scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */ - scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */ - memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8); - } - if (pc->c[0] == INQUIRY) { - scsi_buf[2] |= 2; /* ansi_revision */ - scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */ - } - } - if (atapi_buf && atapi_buf != scsi_buf) - kfree(atapi_buf); -} - -static void hexdump(u8 *x, int len) -{ - int i; - - printk("[ "); - for (i = 0; i < len; i++) - printk("%x ", x[i]); - printk("]\n"); -} - -static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command) -{ - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - idescsi_pc_t *pc; - struct request *rq; - u8 *buf; - - /* stuff a sense request in front of our current request */ - pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC); - rq = kmalloc (sizeof (struct request), GFP_ATOMIC); - buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC); - if (pc == NULL || rq == NULL || buf == NULL) { - if (pc) kfree(pc); - if (rq) kfree(rq); - if (buf) kfree(buf); - return -ENOMEM; - } - memset (pc, 0, sizeof (idescsi_pc_t)); - memset (buf, 0, SCSI_SENSE_BUFFERSIZE); - ide_init_drive_cmd(rq); - rq->special = (char *) pc; - pc->rq = rq; - pc->buffer = buf; - pc->c[0] = REQUEST_SENSE; - pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE; - rq->flags = REQ_SENSE; - pc->timeout = jiffies + WAIT_READY; - /* NOTE! Save the failed packet command in "rq->buffer" */ - rq->buffer = (void *) failed_command->special; - pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd; - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { - printk ("ide-scsi: %s: queue cmd = ", drive->name); - hexdump(pc->c, 6); - } - rq->rq_disk = scsi->disk; - return ide_do_drive_cmd(drive, rq, ide_preempt); -} - -static int idescsi_end_request(ide_drive_t *, int, int); - -static ide_startstop_t -idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) -{ - if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) - /* force an abort */ - HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); - - rq->errors++; - - idescsi_end_request(drive, 0, 0); - - return ide_stopped; -} - -static ide_startstop_t -idescsi_atapi_abort(ide_drive_t *drive, struct request *rq) -{ -#if IDESCSI_DEBUG_LOG - printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n", - ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number); -#endif - rq->errors |= ERROR_MAX; - - idescsi_end_request(drive, 0, 0); - - return ide_stopped; -} - -static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs) -{ - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - struct request *rq = HWGROUP(drive)->rq; - idescsi_pc_t *pc = (idescsi_pc_t *) rq->special; - int log = test_bit(IDESCSI_LOG_CMD, &scsi->log); - struct Scsi_Host *host; - u8 *scsi_buf; - unsigned long flags; - - if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) { - ide_end_request(drive, uptodate, nrsecs); - return 0; - } - ide_end_drive_cmd (drive, 0, 0); - if (rq->flags & REQ_SENSE) { - idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer; - if (log) { - printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number); - hexdump(pc->buffer,16); - } - memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE); - kfree(pc->buffer); - kfree(pc); - kfree(rq); - pc = opc; - rq = pc->rq; - pc->scsi_cmd->result = (CHECK_CONDITION << 1) | - ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16); - } else if (test_bit(PC_TIMEDOUT, &pc->flags)) { - if (log) - printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n", - drive->name, pc->scsi_cmd->serial_number); - pc->scsi_cmd->result = DID_TIME_OUT << 16; - } else if (rq->errors >= ERROR_MAX) { - pc->scsi_cmd->result = DID_ERROR << 16; - if (log) - printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number); - } else if (rq->errors) { - if (log) - printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number); - if (!idescsi_check_condition(drive, rq)) - /* we started a request sense, so we'll be back, exit for now */ - return 0; - pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16); - } else { - pc->scsi_cmd->result = DID_OK << 16; - idescsi_transform_pc2 (drive, pc); - if (log) { - printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number); - if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) { - printk(", rst = "); - scsi_buf = pc->scsi_cmd->request_buffer; - hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen)); - } else printk("\n"); - } - } - host = pc->scsi_cmd->device->host; - spin_lock_irqsave(host->host_lock, flags); - pc->done(pc->scsi_cmd); - spin_unlock_irqrestore(host->host_lock, flags); - kfree(pc); - kfree(rq); - scsi->pc = NULL; - return 0; -} - -static inline unsigned long get_timeout(idescsi_pc_t *pc) -{ - return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies); -} - -static int idescsi_expiry(ide_drive_t *drive) -{ - idescsi_scsi_t *scsi = drive->driver_data; - idescsi_pc_t *pc = scsi->pc; - -#if IDESCSI_DEBUG_LOG - printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies); -#endif - set_bit(PC_TIMEDOUT, &pc->flags); - - return 0; /* we do not want the ide subsystem to retry */ -} - -/* - * Our interrupt handler. - */ -static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive) -{ - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - idescsi_pc_t *pc=scsi->pc; - struct request *rq = pc->rq; - atapi_bcount_t bcount; - atapi_status_t status; - atapi_ireason_t ireason; - atapi_feature_t feature; - - unsigned int temp; - -#if IDESCSI_DEBUG_LOG - printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n"); -#endif /* IDESCSI_DEBUG_LOG */ - - if (test_bit(PC_TIMEDOUT, &pc->flags)){ -#if IDESCSI_DEBUG_LOG - printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n", - pc->scsi_cmd->serial_number, jiffies); -#endif - /* end this request now - scsi should retry it*/ - idescsi_end_request (drive, 1, 0); - return ide_stopped; - } - if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { -#if IDESCSI_DEBUG_LOG - printk ("ide-scsi: %s: DMA complete\n", drive->name); -#endif /* IDESCSI_DEBUG_LOG */ - pc->actually_transferred=pc->request_transfer; - (void) HWIF(drive)->ide_dma_end(drive); - } - - feature.all = 0; - /* Clear the interrupt */ - status.all = HWIF(drive)->INB(IDE_STATUS_REG); - - if (!status.b.drq) { - /* No more interrupts */ - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) - printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred); - local_irq_enable(); - if (status.b.check) - rq->errors++; - idescsi_end_request (drive, 1, 0); - return ide_stopped; - } - bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG); - bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG); - ireason.all = HWIF(drive)->INB(IDE_IREASON_REG); - - if (ireason.b.cod) { - printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n"); - return ide_do_reset (drive); - } - if (ireason.b.io) { - temp = pc->actually_transferred + bcount.all; - if (temp > pc->request_transfer) { - if (temp > pc->buffer_size) { - printk(KERN_ERR "ide-scsi: The scsi wants to " - "send us more data than expected " - "- discarding data\n"); - temp = pc->buffer_size - pc->actually_transferred; - if (temp) { - clear_bit(PC_WRITING, &pc->flags); - if (pc->sg) - idescsi_input_buffers(drive, pc, temp); - else - drive->hwif->atapi_input_bytes(drive, pc->current_position, temp); - printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all); - } - pc->actually_transferred += temp; - pc->current_position += temp; - idescsi_discard_data(drive, bcount.all - temp); - ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); - return ide_started; - } -#if IDESCSI_DEBUG_LOG - printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n"); -#endif /* IDESCSI_DEBUG_LOG */ - } - } - if (ireason.b.io) { - clear_bit(PC_WRITING, &pc->flags); - if (pc->sg) - idescsi_input_buffers(drive, pc, bcount.all); - else - HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all); - } else { - set_bit(PC_WRITING, &pc->flags); - if (pc->sg) - idescsi_output_buffers (drive, pc, bcount.all); - else - HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all); - } - /* Update the current position */ - pc->actually_transferred += bcount.all; - pc->current_position += bcount.all; - - /* And set the interrupt handler again */ - ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); - return ide_started; -} - -static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive) -{ - ide_hwif_t *hwif = drive->hwif; - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - idescsi_pc_t *pc = scsi->pc; - atapi_ireason_t ireason; - ide_startstop_t startstop; - - if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { - printk(KERN_ERR "ide-scsi: Strange, packet command " - "initiated yet DRQ isn't asserted\n"); - return startstop; - } - ireason.all = HWIF(drive)->INB(IDE_IREASON_REG); - if (!ireason.b.cod || ireason.b.io) { - printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while " - "issuing a packet command\n"); - return ide_do_reset (drive); - } - if (HWGROUP(drive)->handler != NULL) - BUG(); - /* Set the interrupt routine */ - ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); - /* Send the actual packet */ - drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12); - if (test_bit (PC_DMA_OK, &pc->flags)) { - set_bit (PC_DMA_IN_PROGRESS, &pc->flags); - hwif->dma_start(drive); - } - return ide_started; -} - -static inline int idescsi_set_direction(idescsi_pc_t *pc) -{ - switch (pc->c[0]) { - case READ_6: case READ_10: case READ_12: - clear_bit(PC_WRITING, &pc->flags); - return 0; - case WRITE_6: case WRITE_10: case WRITE_12: - set_bit(PC_WRITING, &pc->flags); - return 0; - default: - return 1; - } -} - -static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc) -{ - ide_hwif_t *hwif = drive->hwif; - struct scatterlist *sg, *scsi_sg; - int segments; - - if (!pc->request_transfer || pc->request_transfer % 1024) - return 1; - - if (idescsi_set_direction(pc)) - return 1; - - sg = hwif->sg_table; - scsi_sg = pc->scsi_cmd->request_buffer; - segments = pc->scsi_cmd->use_sg; - - if (segments > hwif->sg_max_nents) - return 1; - - if (!segments) { - hwif->sg_nents = 1; - sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer); - } else { - hwif->sg_nents = segments; - memcpy(sg, scsi_sg, sizeof(*sg) * segments); - } - - return 0; -} - -/* - * Issue a packet command - */ -static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc) -{ - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - ide_hwif_t *hwif = drive->hwif; - atapi_feature_t feature; - atapi_bcount_t bcount; - - scsi->pc=pc; /* Set the current packet command */ - pc->actually_transferred=0; /* We haven't transferred any data yet */ - pc->current_position=pc->buffer; - bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */ - - feature.all = 0; - if (drive->using_dma && !idescsi_map_sg(drive, pc)) { - hwif->sg_mapped = 1; - feature.b.dma = !hwif->dma_setup(drive); - hwif->sg_mapped = 0; - } - - SELECT_DRIVE(drive); - if (IDE_CONTROL_REG) - HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG); - - HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG); - HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG); - HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG); - - if (feature.b.dma) - set_bit(PC_DMA_OK, &pc->flags); - - if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) { - if (HWGROUP(drive)->handler != NULL) - BUG(); - ide_set_handler(drive, &idescsi_transfer_pc, - get_timeout(pc), idescsi_expiry); - /* Issue the packet command */ - HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); - return ide_started; - } else { - /* Issue the packet command */ - HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); - return idescsi_transfer_pc(drive); - } -} - -/* - * idescsi_do_request is our request handling function. - */ -static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block) -{ -#if IDESCSI_DEBUG_LOG - printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors); - printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); -#endif /* IDESCSI_DEBUG_LOG */ - - if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) { - return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special); - } - blk_dump_rq_flags(rq, "ide-scsi: unsup command"); - idescsi_end_request (drive, 0, 0); - return ide_stopped; -} - -static void idescsi_add_settings(ide_drive_t *drive) -{ - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - -/* - * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function - */ - ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL); - ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL); - ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL); - ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL); - ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL); -} - -/* - * Driver initialization. - */ -static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi) -{ - if (drive->id && (drive->id->config & 0x0060) == 0x20) - set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags); - set_bit(IDESCSI_TRANSFORM, &scsi->transform); - clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); -#if IDESCSI_DEBUG_LOG - set_bit(IDESCSI_LOG_CMD, &scsi->log); -#endif /* IDESCSI_DEBUG_LOG */ - idescsi_add_settings(drive); -} - -static int ide_scsi_remove(struct device *dev) -{ - ide_drive_t *drive = to_ide_device(dev); - struct Scsi_Host *scsihost = drive->driver_data; - struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost); - struct gendisk *g = scsi->disk; - - ide_unregister_subdriver(drive, scsi->driver); - - ide_unregister_region(g); - - drive->driver_data = NULL; - g->private_data = NULL; - put_disk(g); - - scsi_remove_host(scsihost); - ide_scsi_put(scsi); - - return 0; -} - -static int ide_scsi_probe(struct device *); - -#ifdef CONFIG_PROC_FS -static ide_proc_entry_t idescsi_proc[] = { - { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, - { NULL, 0, NULL, NULL } -}; -#else -# define idescsi_proc NULL -#endif - -static ide_driver_t idescsi_driver = { - .owner = THIS_MODULE, - .gen_driver = { - .name = "ide-scsi", - .bus = &ide_bus_type, - .probe = ide_scsi_probe, - .remove = ide_scsi_remove, - }, - .version = IDESCSI_VERSION, - .media = ide_scsi, - .supports_dsc_overlap = 0, - .proc = idescsi_proc, - .do_request = idescsi_do_request, - .end_request = idescsi_end_request, - .error = idescsi_atapi_error, - .abort = idescsi_atapi_abort, -}; - -static int idescsi_ide_open(struct inode *inode, struct file *filp) -{ - struct gendisk *disk = inode->i_bdev->bd_disk; - struct ide_scsi_obj *scsi; - ide_drive_t *drive; - - if (!(scsi = ide_scsi_get(disk))) - return -ENXIO; - - drive = scsi->drive; - - drive->usage++; - - return 0; -} - -static int idescsi_ide_release(struct inode *inode, struct file *filp) -{ - struct gendisk *disk = inode->i_bdev->bd_disk; - struct ide_scsi_obj *scsi = ide_scsi_g(disk); - ide_drive_t *drive = scsi->drive; - - drive->usage--; - - ide_scsi_put(scsi); - - return 0; -} - -static int idescsi_ide_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - struct block_device *bdev = inode->i_bdev; - struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk); - return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg); -} - -static struct block_device_operations idescsi_ops = { - .owner = THIS_MODULE, - .open = idescsi_ide_open, - .release = idescsi_ide_release, - .ioctl = idescsi_ide_ioctl, -}; - -static int idescsi_slave_configure(struct scsi_device * sdp) -{ - /* Configure detected device */ - scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun); - return 0; -} - -static const char *idescsi_info (struct Scsi_Host *host) -{ - return "SCSI host adapter emulation for IDE ATAPI devices"; -} - -static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg) -{ - idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host); - - if (cmd == SG_SET_TRANSFORM) { - if (arg) - set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); - else - clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); - return 0; - } else if (cmd == SG_GET_TRANSFORM) - return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg); - return -EINVAL; -} - -static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd) -{ - idescsi_scsi_t *scsi = drive_to_idescsi(drive); - - /* this was a layering violation and we can't support it - anymore, sorry. */ -#if 0 - struct gendisk *disk = cmd->request->rq_disk; - - if (disk) { - struct Scsi_Device_Template **p = disk->private_data; - if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0) - return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); - } -#endif - return test_bit(IDESCSI_TRANSFORM, &scsi->transform); -} - -static int idescsi_queue (struct scsi_cmnd *cmd, - void (*done)(struct scsi_cmnd *)) -{ - struct Scsi_Host *host = cmd->device->host; - idescsi_scsi_t *scsi = scsihost_to_idescsi(host); - ide_drive_t *drive = scsi->drive; - struct request *rq = NULL; - idescsi_pc_t *pc = NULL; - - if (!drive) { - scmd_printk (KERN_ERR, cmd, "drive not present\n"); - goto abort; - } - scsi = drive_to_idescsi(drive); - pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC); - rq = kmalloc (sizeof (struct request), GFP_ATOMIC); - if (rq == NULL || pc == NULL) { - printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name); - goto abort; - } - - memset (pc->c, 0, 12); - pc->flags = 0; - pc->rq = rq; - memcpy (pc->c, cmd->cmnd, cmd->cmd_len); - if (cmd->use_sg) { - pc->buffer = NULL; - pc->sg = cmd->request_buffer; - } else { - pc->buffer = cmd->request_buffer; - pc->sg = NULL; - } - pc->b_count = 0; - pc->request_transfer = pc->buffer_size = cmd->request_bufflen; - pc->scsi_cmd = cmd; - pc->done = done; - pc->timeout = jiffies + cmd->timeout_per_command; - - if (should_transform(drive, cmd)) - set_bit(PC_TRANSFORM, &pc->flags); - idescsi_transform_pc1 (drive, pc); - - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { - printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number); - hexdump(cmd->cmnd, cmd->cmd_len); - if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) { - printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number); - hexdump(pc->c, 12); - } - } - - ide_init_drive_cmd (rq); - rq->special = (char *) pc; - rq->flags = REQ_SPECIAL; - spin_unlock_irq(host->host_lock); - rq->rq_disk = scsi->disk; - (void) ide_do_drive_cmd (drive, rq, ide_end); - spin_lock_irq(host->host_lock); - return 0; -abort: - if (pc) kfree (pc); - if (rq) kfree (rq); - cmd->result = DID_ERROR << 16; - done(cmd); - return 0; -} - -static int idescsi_eh_abort (struct scsi_cmnd *cmd) -{ - idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host); - ide_drive_t *drive = scsi->drive; - int busy; - int ret = FAILED; - - /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */ - - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) - printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number); - - if (!drive) { - printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n"); - WARN_ON(1); - goto no_drive; - } - - /* First give it some more time, how much is "right" is hard to say :-( */ - - busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */ - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) - printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":""); - - spin_lock_irq(&ide_lock); - - /* If there is no pc running we're done (our interrupt took care of it) */ - if (!scsi->pc) { - ret = SUCCESS; - goto ide_unlock; - } - - /* It's somewhere in flight. Does ide subsystem agree? */ - if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy && - elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) { - /* - * FIXME - not sure this condition can ever occur - */ - printk (KERN_ERR "ide-scsi: cmd aborted!\n"); - - if (scsi->pc->rq->flags & REQ_SENSE) - kfree(scsi->pc->buffer); - kfree(scsi->pc->rq); - kfree(scsi->pc); - scsi->pc = NULL; - - ret = SUCCESS; - } - -ide_unlock: - spin_unlock_irq(&ide_lock); -no_drive: - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) - printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed"); - - return ret; -} - -static int idescsi_eh_reset (struct scsi_cmnd *cmd) -{ - struct request *req; - idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host); - ide_drive_t *drive = scsi->drive; - int ready = 0; - int ret = SUCCESS; - - /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */ - - if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) - printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number); - - if (!drive) { - printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n"); - WARN_ON(1); - return FAILED; - } - - spin_lock_irq(cmd->device->host->host_lock); - spin_lock(&ide_lock); - - if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) { - printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n"); - spin_unlock(&ide_lock); - spin_unlock_irq(cmd->device->host->host_lock); - return FAILED; - } - - /* kill current request */ - blkdev_dequeue_request(req); - end_that_request_last(req); - if (req->flags & REQ_SENSE) - kfree(scsi->pc->buffer); - kfree(scsi->pc); - scsi->pc = NULL; - kfree(req); - - /* now nuke the drive queue */ - while ((req = elv_next_request(drive->queue))) { - blkdev_dequeue_request(req); - end_that_request_last(req); - } - - HWGROUP(drive)->rq = NULL; - HWGROUP(drive)->handler = NULL; - HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */ - spin_unlock(&ide_lock); - - ide_do_reset(drive); - - /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */ - - do { - spin_unlock_irq(cmd->device->host->host_lock); - msleep(50); - spin_lock_irq(cmd->device->host->host_lock); - } while ( HWGROUP(drive)->handler ); - - ready = drive_is_ready(drive); - HWGROUP(drive)->busy--; - if (!ready) { - printk (KERN_ERR "ide-scsi: reset failed!\n"); - ret = FAILED; - } - - spin_unlock_irq(cmd->device->host->host_lock); - return ret; -} - -static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev, - sector_t capacity, int *parm) -{ - idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host); - ide_drive_t *drive = idescsi->drive; - - if (drive->bios_cyl && drive->bios_head && drive->bios_sect) { - parm[0] = drive->bios_head; - parm[1] = drive->bios_sect; - parm[2] = drive->bios_cyl; - } - return 0; -} - -static struct scsi_host_template idescsi_template = { - .module = THIS_MODULE, - .name = "idescsi", - .info = idescsi_info, - .slave_configure = idescsi_slave_configure, - .ioctl = idescsi_ioctl, - .queuecommand = idescsi_queue, - .eh_abort_handler = idescsi_eh_abort, - .eh_host_reset_handler = idescsi_eh_reset, - .bios_param = idescsi_bios, - .can_queue = 40, - .this_id = -1, - .sg_tablesize = 256, - .cmd_per_lun = 5, - .max_sectors = 128, - .use_clustering = DISABLE_CLUSTERING, - .emulated = 1, - .proc_name = "ide-scsi", -}; - -static int ide_scsi_probe(struct device *dev) -{ - ide_drive_t *drive = to_ide_device(dev); - idescsi_scsi_t *idescsi; - struct Scsi_Host *host; - struct gendisk *g; - static int warned; - int err = -ENOMEM; - - if (!warned && drive->media == ide_cdrom) { - printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n"); - warned = 1; - } - - if (!strstr("ide-scsi", drive->driver_req) || - !drive->present || - drive->media == ide_disk || - !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t)))) - return -ENODEV; - - g = alloc_disk(1 << PARTN_BITS); - if (!g) - goto out_host_put; - - ide_init_disk(g, drive); - - host->max_id = 1; - -#if IDESCSI_DEBUG_LOG - if (drive->id->last_lun) - printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun); -#endif - if ((drive->id->last_lun & 0x7) != 7) - host->max_lun = (drive->id->last_lun & 0x7) + 1; - else - host->max_lun = 1; - - drive->driver_data = host; - idescsi = scsihost_to_idescsi(host); - idescsi->drive = drive; - idescsi->driver = &idescsi_driver; - idescsi->host = host; - idescsi->disk = g; - g->private_data = &idescsi->driver; - ide_register_subdriver(drive, &idescsi_driver); - err = 0; - idescsi_setup(drive, idescsi); - g->fops = &idescsi_ops; - ide_register_region(g); - err = scsi_add_host(host, &drive->gendev); - if (!err) { - scsi_scan_host(host); - return 0; - } - /* fall through on error */ - ide_unregister_region(g); - ide_unregister_subdriver(drive, &idescsi_driver); - - put_disk(g); -out_host_put: - scsi_host_put(host); - return err; -} - -static int __init init_idescsi_module(void) -{ - return driver_register(&idescsi_driver.gen_driver); -} - -static void __exit exit_idescsi_module(void) -{ - driver_unregister(&idescsi_driver.gen_driver); -} - -module_init(init_idescsi_module); -module_exit(exit_idescsi_module); -MODULE_LICENSE("GPL"); |