2 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
12 * Ver 0.1 Dec 3 96 Initial version.
13 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
14 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
15 * to Janos Farkas for pointing this out.
16 * Avoid using bitfields in structures for m68k.
17 * Added Scatter/Gather and DMA support.
18 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
19 * Use variable timeout for each command.
20 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
21 * Allow disabling of SCSI-6 to SCSI-10 transformation.
22 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
23 * for access through /dev/sg.
24 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
25 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
26 * detection of devices with CONFIG_SCSI_MULTI_LUN
27 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
28 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
29 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
30 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
33 #define IDESCSI_VERSION "0.92"
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/kernel.h>
40 #include <linux/ioport.h>
41 #include <linux/blkdev.h>
42 #include <linux/errno.h>
43 #include <linux/hdreg.h>
44 #include <linux/slab.h>
45 #include <linux/ide.h>
46 #include <linux/scatterlist.h>
47 #include <linux/delay.h>
48 #include <linux/mutex.h>
49 #include <linux/bitops.h>
52 #include <asm/uaccess.h>
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_tcq.h>
61 #define IDESCSI_DEBUG_LOG 0
64 * SCSI command transformation layer
66 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
71 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
73 typedef struct ide_scsi_obj {
77 struct Scsi_Host *host;
79 struct ide_atapi_pc *pc; /* Current packet command */
80 unsigned long flags; /* Status/Action flags */
81 unsigned long transform; /* SCSI cmd translation layer */
82 unsigned long log; /* log flags */
85 static DEFINE_MUTEX(idescsi_ref_mutex);
86 /* Set by module param to skip cd */
87 static int idescsi_nocd;
89 #define ide_scsi_g(disk) \
90 container_of((disk)->private_data, struct ide_scsi_obj, driver)
92 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
94 struct ide_scsi_obj *scsi = NULL;
96 mutex_lock(&idescsi_ref_mutex);
97 scsi = ide_scsi_g(disk);
99 scsi_host_get(scsi->host);
100 mutex_unlock(&idescsi_ref_mutex);
104 static void ide_scsi_put(struct ide_scsi_obj *scsi)
106 mutex_lock(&idescsi_ref_mutex);
107 scsi_host_put(scsi->host);
108 mutex_unlock(&idescsi_ref_mutex);
111 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
113 return (idescsi_scsi_t*) (&host[1]);
116 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
118 return scsihost_to_idescsi(ide_drive->driver_data);
122 * Per ATAPI device status bits.
124 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
129 #define IDESCSI_PC_RQ 90
132 * PIO data transfer routines using the scatter gather table.
134 static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
137 ide_hwif_t *hwif = drive->hwif;
142 count = min(pc->sg->length - pc->b_count, bcount);
143 if (PageHighMem(sg_page(pc->sg))) {
146 local_irq_save(flags);
147 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
149 hwif->input_data(drive, NULL, buf + pc->b_count, count);
150 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
151 local_irq_restore(flags);
153 buf = sg_virt(pc->sg);
154 hwif->input_data(drive, NULL, buf + pc->b_count, count);
156 bcount -= count; pc->b_count += count;
157 if (pc->b_count == pc->sg->length) {
160 pc->sg = sg_next(pc->sg);
166 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
167 ide_pad_transfer(drive, 0, bcount);
171 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
174 ide_hwif_t *hwif = drive->hwif;
179 count = min(pc->sg->length - pc->b_count, bcount);
180 if (PageHighMem(sg_page(pc->sg))) {
183 local_irq_save(flags);
184 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
186 hwif->output_data(drive, NULL, buf + pc->b_count, count);
187 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
188 local_irq_restore(flags);
190 buf = sg_virt(pc->sg);
191 hwif->output_data(drive, NULL, buf + pc->b_count, count);
193 bcount -= count; pc->b_count += count;
194 if (pc->b_count == pc->sg->length) {
197 pc->sg = sg_next(pc->sg);
203 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
204 ide_pad_transfer(drive, 1, bcount);
208 static void ide_scsi_hex_dump(u8 *data, int len)
210 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
213 static int idescsi_check_condition(ide_drive_t *drive,
214 struct request *failed_cmd)
216 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
217 struct ide_atapi_pc *pc;
221 /* stuff a sense request in front of our current request */
222 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
223 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
224 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
225 if (!pc || !rq || !buf) {
231 blk_rq_init(NULL, rq);
232 rq->special = (char *) pc;
235 pc->c[0] = REQUEST_SENSE;
236 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
237 rq->cmd_type = REQ_TYPE_SENSE;
238 rq->cmd_flags |= REQ_PREEMPT;
239 pc->timeout = jiffies + WAIT_READY;
240 /* NOTE! Save the failed packet command in "rq->buffer" */
241 rq->buffer = (void *) failed_cmd->special;
242 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
243 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
244 printk ("ide-scsi: %s: queue cmd = ", drive->name);
245 ide_scsi_hex_dump(pc->c, 6);
247 rq->rq_disk = scsi->disk;
248 ide_do_drive_cmd(drive, rq);
252 static int idescsi_end_request(ide_drive_t *, int, int);
254 static ide_startstop_t
255 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
257 ide_hwif_t *hwif = drive->hwif;
259 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
261 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
262 hwif->io_ports.command_addr);
266 idescsi_end_request(drive, 0, 0);
271 static ide_startstop_t
272 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
274 #if IDESCSI_DEBUG_LOG
275 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
276 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
278 rq->errors |= ERROR_MAX;
280 idescsi_end_request(drive, 0, 0);
285 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
287 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
288 struct request *rq = HWGROUP(drive)->rq;
289 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
290 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
291 struct Scsi_Host *host;
292 int errors = rq->errors;
295 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
296 ide_end_request(drive, uptodate, nrsecs);
299 ide_end_drive_cmd (drive, 0, 0);
300 if (blk_sense_request(rq)) {
301 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
303 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
304 ide_scsi_hex_dump(pc->buf, 16);
306 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
307 SCSI_SENSE_BUFFERSIZE);
313 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
314 (((pc->flags & PC_FLAG_TIMEDOUT) ?
317 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
319 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
320 drive->name, pc->scsi_cmd->serial_number);
321 pc->scsi_cmd->result = DID_TIME_OUT << 16;
322 } else if (errors >= ERROR_MAX) {
323 pc->scsi_cmd->result = DID_ERROR << 16;
325 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
328 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
329 if (!idescsi_check_condition(drive, rq))
330 /* we started a request sense, so we'll be back, exit for now */
332 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
334 pc->scsi_cmd->result = DID_OK << 16;
336 host = pc->scsi_cmd->device->host;
337 spin_lock_irqsave(host->host_lock, flags);
338 pc->done(pc->scsi_cmd);
339 spin_unlock_irqrestore(host->host_lock, flags);
346 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
348 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
351 static int idescsi_expiry(ide_drive_t *drive)
353 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
354 struct ide_atapi_pc *pc = scsi->pc;
356 #if IDESCSI_DEBUG_LOG
357 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
359 pc->flags |= PC_FLAG_TIMEDOUT;
361 return 0; /* we do not want the ide subsystem to retry */
365 * Our interrupt handler.
367 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
369 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
370 ide_hwif_t *hwif = drive->hwif;
371 struct ide_atapi_pc *pc = scsi->pc;
372 struct request *rq = pc->rq;
377 #if IDESCSI_DEBUG_LOG
378 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
379 #endif /* IDESCSI_DEBUG_LOG */
381 if (pc->flags & PC_FLAG_TIMEDOUT) {
382 #if IDESCSI_DEBUG_LOG
383 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
384 pc->scsi_cmd->serial_number, jiffies);
386 /* end this request now - scsi should retry it*/
387 idescsi_end_request (drive, 1, 0);
390 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
391 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
392 #if IDESCSI_DEBUG_LOG
393 printk ("ide-scsi: %s: DMA complete\n", drive->name);
394 #endif /* IDESCSI_DEBUG_LOG */
395 pc->xferred = pc->req_xfer;
396 (void)hwif->dma_ops->dma_end(drive);
399 /* Clear the interrupt */
400 stat = ide_read_status(drive);
402 if ((stat & DRQ_STAT) == 0) {
403 /* No more interrupts */
404 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
405 printk(KERN_INFO "Packet command completed, %d bytes"
406 " transferred\n", pc->xferred);
407 local_irq_enable_in_hardirq();
410 idescsi_end_request (drive, 1, 0);
413 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
414 hwif->INB(hwif->io_ports.lbam_addr);
415 ireason = hwif->INB(hwif->io_ports.nsect_addr);
418 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
419 return ide_do_reset (drive);
422 temp = pc->xferred + bcount;
423 if (temp > pc->req_xfer) {
424 if (temp > pc->buf_size) {
425 printk(KERN_ERR "ide-scsi: The scsi wants to "
426 "send us more data than expected "
427 "- discarding data\n");
428 temp = pc->buf_size - pc->xferred;
430 pc->flags &= ~PC_FLAG_WRITING;
432 idescsi_input_buffers(drive, pc,
435 hwif->input_data(drive, NULL,
437 printk(KERN_ERR "ide-scsi: transferred"
443 ide_pad_transfer(drive, 0, bcount - temp);
444 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
447 #if IDESCSI_DEBUG_LOG
448 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
449 #endif /* IDESCSI_DEBUG_LOG */
453 pc->flags &= ~PC_FLAG_WRITING;
455 idescsi_input_buffers(drive, pc, bcount);
457 hwif->input_data(drive, NULL, pc->cur_pos, bcount);
459 pc->flags |= PC_FLAG_WRITING;
461 idescsi_output_buffers(drive, pc, bcount);
463 hwif->output_data(drive, NULL, pc->cur_pos, bcount);
465 /* Update the current position */
466 pc->xferred += bcount;
467 pc->cur_pos += bcount;
469 /* And set the interrupt handler again */
470 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
474 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
476 ide_hwif_t *hwif = drive->hwif;
477 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
478 struct ide_atapi_pc *pc = scsi->pc;
479 ide_startstop_t startstop;
482 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
483 printk(KERN_ERR "ide-scsi: Strange, packet command "
484 "initiated yet DRQ isn't asserted\n");
487 ireason = hwif->INB(hwif->io_ports.nsect_addr);
488 if ((ireason & CD) == 0 || (ireason & IO)) {
489 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
490 "issuing a packet command\n");
491 return ide_do_reset (drive);
493 BUG_ON(HWGROUP(drive)->handler != NULL);
494 /* Set the interrupt routine */
495 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
497 if (pc->flags & PC_FLAG_DMA_OK) {
498 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
499 hwif->dma_ops->dma_start(drive);
502 /* Send the actual packet */
503 hwif->output_data(drive, NULL, scsi->pc->c, 12);
508 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
511 case READ_6: case READ_10: case READ_12:
512 pc->flags &= ~PC_FLAG_WRITING;
514 case WRITE_6: case WRITE_10: case WRITE_12:
515 pc->flags |= PC_FLAG_WRITING;
522 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
524 ide_hwif_t *hwif = drive->hwif;
525 struct scatterlist *sg, *scsi_sg;
528 if (!pc->req_xfer || pc->req_xfer % 1024)
531 if (idescsi_set_direction(pc))
535 scsi_sg = scsi_sglist(pc->scsi_cmd);
536 segments = scsi_sg_count(pc->scsi_cmd);
538 if (segments > hwif->sg_max_nents)
541 hwif->sg_nents = segments;
542 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
547 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
548 struct ide_atapi_pc *pc)
550 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
551 ide_hwif_t *hwif = drive->hwif;
555 /* Set the current packet command */
557 /* We haven't transferred any data yet */
559 pc->cur_pos = pc->buf;
560 /* Request to transfer the entire buffer at once */
561 bcount = min(pc->req_xfer, 63 * 1024);
563 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
565 dma = !hwif->dma_ops->dma_setup(drive);
569 ide_pktcmd_tf_load(drive, 0, bcount, dma);
572 pc->flags |= PC_FLAG_DMA_OK;
574 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
575 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
576 get_timeout(pc), idescsi_expiry);
579 /* Issue the packet command */
580 ide_execute_pkt_cmd(drive);
581 return idescsi_transfer_pc(drive);
586 * idescsi_do_request is our request handling function.
588 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
590 #if IDESCSI_DEBUG_LOG
591 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
592 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
593 #endif /* IDESCSI_DEBUG_LOG */
595 if (blk_sense_request(rq) || blk_special_request(rq)) {
596 return idescsi_issue_pc(drive,
597 (struct ide_atapi_pc *) rq->special);
599 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
600 idescsi_end_request (drive, 0, 0);
604 #ifdef CONFIG_IDE_PROC_FS
605 static void idescsi_add_settings(ide_drive_t *drive)
607 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
610 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
612 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
613 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
614 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
615 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
616 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
619 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
623 * Driver initialization.
625 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
627 if (drive->id && (drive->id->config & 0x0060) == 0x20)
628 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
629 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
630 #if IDESCSI_DEBUG_LOG
631 set_bit(IDESCSI_LOG_CMD, &scsi->log);
632 #endif /* IDESCSI_DEBUG_LOG */
633 idescsi_add_settings(drive);
636 static void ide_scsi_remove(ide_drive_t *drive)
638 struct Scsi_Host *scsihost = drive->driver_data;
639 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
640 struct gendisk *g = scsi->disk;
642 scsi_remove_host(scsihost);
643 ide_proc_unregister_driver(drive, scsi->driver);
645 ide_unregister_region(g);
647 drive->driver_data = NULL;
648 g->private_data = NULL;
654 static int ide_scsi_probe(ide_drive_t *);
656 #ifdef CONFIG_IDE_PROC_FS
657 static ide_proc_entry_t idescsi_proc[] = {
658 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
659 { NULL, 0, NULL, NULL }
663 static ide_driver_t idescsi_driver = {
665 .owner = THIS_MODULE,
667 .bus = &ide_bus_type,
669 .probe = ide_scsi_probe,
670 .remove = ide_scsi_remove,
671 .version = IDESCSI_VERSION,
673 .supports_dsc_overlap = 0,
674 .do_request = idescsi_do_request,
675 .end_request = idescsi_end_request,
676 .error = idescsi_atapi_error,
677 .abort = idescsi_atapi_abort,
678 #ifdef CONFIG_IDE_PROC_FS
679 .proc = idescsi_proc,
683 static int idescsi_ide_open(struct inode *inode, struct file *filp)
685 struct gendisk *disk = inode->i_bdev->bd_disk;
686 struct ide_scsi_obj *scsi;
688 if (!(scsi = ide_scsi_get(disk)))
694 static int idescsi_ide_release(struct inode *inode, struct file *filp)
696 struct gendisk *disk = inode->i_bdev->bd_disk;
697 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
704 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
705 unsigned int cmd, unsigned long arg)
707 struct block_device *bdev = inode->i_bdev;
708 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
709 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
712 static struct block_device_operations idescsi_ops = {
713 .owner = THIS_MODULE,
714 .open = idescsi_ide_open,
715 .release = idescsi_ide_release,
716 .ioctl = idescsi_ide_ioctl,
719 static int idescsi_slave_configure(struct scsi_device * sdp)
721 /* Configure detected device */
722 sdp->use_10_for_rw = 1;
723 sdp->use_10_for_ms = 1;
724 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
728 static const char *idescsi_info (struct Scsi_Host *host)
730 return "SCSI host adapter emulation for IDE ATAPI devices";
733 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
735 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
737 if (cmd == SG_SET_TRANSFORM) {
739 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
741 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
743 } else if (cmd == SG_GET_TRANSFORM)
744 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
748 static int idescsi_queue (struct scsi_cmnd *cmd,
749 void (*done)(struct scsi_cmnd *))
751 struct Scsi_Host *host = cmd->device->host;
752 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
753 ide_drive_t *drive = scsi->drive;
754 struct request *rq = NULL;
755 struct ide_atapi_pc *pc = NULL;
758 scmd_printk (KERN_ERR, cmd, "drive not present\n");
761 scsi = drive_to_idescsi(drive);
762 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
763 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
764 if (rq == NULL || pc == NULL) {
765 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
769 memset (pc->c, 0, 12);
772 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
774 pc->sg = scsi_sglist(cmd);
775 pc->sg_cnt = scsi_sg_count(cmd);
777 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
780 pc->timeout = jiffies + cmd->timeout_per_command;
782 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
783 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
784 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
785 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
786 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
787 ide_scsi_hex_dump(pc->c, 12);
791 blk_rq_init(NULL, rq);
792 rq->special = (char *) pc;
793 rq->cmd_type = REQ_TYPE_SPECIAL;
794 spin_unlock_irq(host->host_lock);
795 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
796 spin_lock_irq(host->host_lock);
801 cmd->result = DID_ERROR << 16;
806 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
808 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
809 ide_drive_t *drive = scsi->drive;
813 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
815 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
816 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
819 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
824 /* First give it some more time, how much is "right" is hard to say :-( */
826 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
827 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
828 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
830 spin_lock_irq(&ide_lock);
832 /* If there is no pc running we're done (our interrupt took care of it) */
838 /* It's somewhere in flight. Does ide subsystem agree? */
839 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
840 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
842 * FIXME - not sure this condition can ever occur
844 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
846 if (blk_sense_request(scsi->pc->rq))
847 kfree(scsi->pc->buf);
856 spin_unlock_irq(&ide_lock);
858 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
859 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
864 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
867 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
868 ide_drive_t *drive = scsi->drive;
872 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
874 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
875 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
878 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
883 spin_lock_irq(cmd->device->host->host_lock);
884 spin_lock(&ide_lock);
886 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
887 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
888 spin_unlock(&ide_lock);
889 spin_unlock_irq(cmd->device->host->host_lock);
893 /* kill current request */
894 if (__blk_end_request(req, -EIO, 0))
896 if (blk_sense_request(req))
897 kfree(scsi->pc->buf);
902 /* now nuke the drive queue */
903 while ((req = elv_next_request(drive->queue))) {
904 if (__blk_end_request(req, -EIO, 0))
908 HWGROUP(drive)->rq = NULL;
909 HWGROUP(drive)->handler = NULL;
910 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
911 spin_unlock(&ide_lock);
915 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
918 spin_unlock_irq(cmd->device->host->host_lock);
920 spin_lock_irq(cmd->device->host->host_lock);
921 } while ( HWGROUP(drive)->handler );
923 ready = drive_is_ready(drive);
924 HWGROUP(drive)->busy--;
926 printk (KERN_ERR "ide-scsi: reset failed!\n");
930 spin_unlock_irq(cmd->device->host->host_lock);
934 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
935 sector_t capacity, int *parm)
937 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
938 ide_drive_t *drive = idescsi->drive;
940 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
941 parm[0] = drive->bios_head;
942 parm[1] = drive->bios_sect;
943 parm[2] = drive->bios_cyl;
948 static struct scsi_host_template idescsi_template = {
949 .module = THIS_MODULE,
951 .info = idescsi_info,
952 .slave_configure = idescsi_slave_configure,
953 .ioctl = idescsi_ioctl,
954 .queuecommand = idescsi_queue,
955 .eh_abort_handler = idescsi_eh_abort,
956 .eh_host_reset_handler = idescsi_eh_reset,
957 .bios_param = idescsi_bios,
963 .use_clustering = DISABLE_CLUSTERING,
965 .proc_name = "ide-scsi",
968 static int ide_scsi_probe(ide_drive_t *drive)
970 idescsi_scsi_t *idescsi;
971 struct Scsi_Host *host;
976 if (!warned && drive->media == ide_cdrom) {
977 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
981 if (idescsi_nocd && drive->media == ide_cdrom)
984 if (!strstr("ide-scsi", drive->driver_req) ||
986 drive->media == ide_disk ||
987 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
990 g = alloc_disk(1 << PARTN_BITS);
994 ide_init_disk(g, drive);
998 #if IDESCSI_DEBUG_LOG
999 if (drive->id->last_lun)
1000 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1002 if ((drive->id->last_lun & 0x7) != 7)
1003 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1007 drive->driver_data = host;
1008 idescsi = scsihost_to_idescsi(host);
1009 idescsi->drive = drive;
1010 idescsi->driver = &idescsi_driver;
1011 idescsi->host = host;
1013 g->private_data = &idescsi->driver;
1014 ide_proc_register_driver(drive, &idescsi_driver);
1016 idescsi_setup(drive, idescsi);
1017 g->fops = &idescsi_ops;
1018 ide_register_region(g);
1019 err = scsi_add_host(host, &drive->gendev);
1021 scsi_scan_host(host);
1024 /* fall through on error */
1025 ide_unregister_region(g);
1026 ide_proc_unregister_driver(drive, &idescsi_driver);
1030 scsi_host_put(host);
1034 static int __init init_idescsi_module(void)
1036 return driver_register(&idescsi_driver.gen_driver);
1039 static void __exit exit_idescsi_module(void)
1041 driver_unregister(&idescsi_driver.gen_driver);
1044 module_param(idescsi_nocd, int, 0600);
1045 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1046 module_init(init_idescsi_module);
1047 module_exit(exit_idescsi_module);
1048 MODULE_LICENSE("GPL");