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 #define debug_log(fmt, args...) \
65 printk(KERN_INFO "ide-scsi: " fmt, ## args)
67 #define debug_log(fmt, args...) do {} while (0)
71 * SCSI command transformation layer
73 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
78 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
80 typedef struct ide_scsi_obj {
84 struct Scsi_Host *host;
86 struct ide_atapi_pc *pc; /* Current packet command */
87 unsigned long flags; /* Status/Action flags */
88 unsigned long transform; /* SCSI cmd translation layer */
89 unsigned long log; /* log flags */
92 static DEFINE_MUTEX(idescsi_ref_mutex);
93 /* Set by module param to skip cd */
94 static int idescsi_nocd;
96 #define ide_scsi_g(disk) \
97 container_of((disk)->private_data, struct ide_scsi_obj, driver)
99 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
101 struct ide_scsi_obj *scsi = NULL;
103 mutex_lock(&idescsi_ref_mutex);
104 scsi = ide_scsi_g(disk);
106 scsi_host_get(scsi->host);
107 mutex_unlock(&idescsi_ref_mutex);
111 static void ide_scsi_put(struct ide_scsi_obj *scsi)
113 mutex_lock(&idescsi_ref_mutex);
114 scsi_host_put(scsi->host);
115 mutex_unlock(&idescsi_ref_mutex);
118 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
120 return (idescsi_scsi_t*) (&host[1]);
123 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
125 return scsihost_to_idescsi(ide_drive->driver_data);
129 * Per ATAPI device status bits.
131 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
136 #define IDESCSI_PC_RQ 90
139 * PIO data transfer routine using the scatter gather table.
141 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
142 unsigned int bcount, int write)
144 ide_hwif_t *hwif = drive->hwif;
145 xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
150 count = min(pc->sg->length - pc->b_count, bcount);
151 if (PageHighMem(sg_page(pc->sg))) {
154 local_irq_save(flags);
155 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
157 xf(drive, NULL, buf + pc->b_count, count);
158 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
159 local_irq_restore(flags);
161 buf = sg_virt(pc->sg);
162 xf(drive, NULL, buf + pc->b_count, count);
164 bcount -= count; pc->b_count += count;
165 if (pc->b_count == pc->sg->length) {
168 pc->sg = sg_next(pc->sg);
174 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
175 drive->name, write ? "padding with zeros"
176 : "discarding data");
177 ide_pad_transfer(drive, write, bcount);
181 static void ide_scsi_hex_dump(u8 *data, int len)
183 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
186 static int idescsi_check_condition(ide_drive_t *drive,
187 struct request *failed_cmd)
189 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
190 struct ide_atapi_pc *pc;
194 /* stuff a sense request in front of our current request */
195 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
196 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
197 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
198 if (!pc || !rq || !buf) {
204 blk_rq_init(NULL, rq);
205 rq->special = (char *) pc;
208 pc->c[0] = REQUEST_SENSE;
209 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
210 rq->cmd_type = REQ_TYPE_SENSE;
211 rq->cmd_flags |= REQ_PREEMPT;
212 pc->timeout = jiffies + WAIT_READY;
213 /* NOTE! Save the failed packet command in "rq->buffer" */
214 rq->buffer = (void *) failed_cmd->special;
215 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
216 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
217 printk ("ide-scsi: %s: queue cmd = ", drive->name);
218 ide_scsi_hex_dump(pc->c, 6);
220 rq->rq_disk = scsi->disk;
221 ide_do_drive_cmd(drive, rq);
225 static int idescsi_end_request(ide_drive_t *, int, int);
227 static ide_startstop_t
228 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
230 ide_hwif_t *hwif = drive->hwif;
232 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
234 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
235 hwif->io_ports.command_addr);
239 idescsi_end_request(drive, 0, 0);
244 static ide_startstop_t
245 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
247 debug_log("%s called for %lu\n", __func__,
248 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
250 rq->errors |= ERROR_MAX;
252 idescsi_end_request(drive, 0, 0);
257 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
259 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
260 struct request *rq = HWGROUP(drive)->rq;
261 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
262 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
263 struct Scsi_Host *host;
264 int errors = rq->errors;
267 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
268 ide_end_request(drive, uptodate, nrsecs);
271 ide_end_drive_cmd (drive, 0, 0);
272 if (blk_sense_request(rq)) {
273 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
275 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
276 ide_scsi_hex_dump(pc->buf, 16);
278 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
279 SCSI_SENSE_BUFFERSIZE);
285 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
286 (((pc->flags & PC_FLAG_TIMEDOUT) ?
289 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
291 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
292 drive->name, pc->scsi_cmd->serial_number);
293 pc->scsi_cmd->result = DID_TIME_OUT << 16;
294 } else if (errors >= ERROR_MAX) {
295 pc->scsi_cmd->result = DID_ERROR << 16;
297 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
300 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
301 if (!idescsi_check_condition(drive, rq))
302 /* we started a request sense, so we'll be back, exit for now */
304 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
306 pc->scsi_cmd->result = DID_OK << 16;
308 host = pc->scsi_cmd->device->host;
309 spin_lock_irqsave(host->host_lock, flags);
310 pc->done(pc->scsi_cmd);
311 spin_unlock_irqrestore(host->host_lock, flags);
318 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
320 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
323 static int idescsi_expiry(ide_drive_t *drive)
325 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
326 struct ide_atapi_pc *pc = scsi->pc;
328 debug_log("%s called for %lu at %lu\n", __func__,
329 pc->scsi_cmd->serial_number, jiffies);
331 pc->flags |= PC_FLAG_TIMEDOUT;
333 return 0; /* we do not want the ide subsystem to retry */
337 * Our interrupt handler.
339 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
341 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
342 ide_hwif_t *hwif = drive->hwif;
343 struct ide_atapi_pc *pc = scsi->pc;
344 struct request *rq = pc->rq;
345 xfer_func_t *xferfunc;
350 debug_log("Reached %s interrupt handler\n", __func__);
352 if (pc->flags & PC_FLAG_TIMEDOUT) {
353 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
354 pc->scsi_cmd->serial_number, jiffies);
355 /* end this request now - scsi should retry it*/
356 idescsi_end_request (drive, 1, 0);
359 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
360 if (hwif->dma_ops->dma_end(drive))
361 pc->flags |= PC_FLAG_DMA_ERROR;
363 pc->xferred = pc->req_xfer;
364 debug_log("%s: DMA finished\n", drive->name);
367 /* Clear the interrupt */
368 stat = ide_read_status(drive);
370 if ((stat & DRQ_STAT) == 0) {
371 /* No more interrupts */
372 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
373 printk(KERN_INFO "Packet command completed, %d bytes"
374 " transferred\n", pc->xferred);
375 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
376 local_irq_enable_in_hardirq();
377 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
379 idescsi_end_request (drive, 1, 0);
382 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
383 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
384 printk(KERN_ERR "%s: The device wants to issue more interrupts "
385 "in DMA mode\n", drive->name);
387 return ide_do_reset(drive);
389 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
390 hwif->INB(hwif->io_ports.lbam_addr);
391 ireason = hwif->INB(hwif->io_ports.nsect_addr);
394 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
395 return ide_do_reset (drive);
397 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
398 /* Hopefully, we will never get here */
399 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
400 "to %s!\n", drive->name,
401 (ireason & IO) ? "Write" : "Read",
402 (ireason & IO) ? "Read" : "Write");
403 return ide_do_reset(drive);
405 if (!(pc->flags & PC_FLAG_WRITING)) {
406 temp = pc->xferred + bcount;
407 if (temp > pc->req_xfer) {
408 if (temp > pc->buf_size) {
409 printk(KERN_ERR "%s: The device wants to send "
410 "us more data than expected - "
413 temp = pc->buf_size - pc->xferred;
416 ide_scsi_io_buffers(drive, pc,
419 hwif->input_data(drive, NULL,
421 printk(KERN_ERR "%s: transferred %d of "
428 ide_pad_transfer(drive, 0, bcount - temp);
429 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
432 debug_log("The device wants to send us more data than "
433 "expected - allowing transfer\n");
435 xferfunc = hwif->input_data;
437 xferfunc = hwif->output_data;
440 ide_scsi_io_buffers(drive, pc, bcount,
441 !!(pc->flags & PC_FLAG_WRITING));
443 xferfunc(drive, NULL, pc->cur_pos, bcount);
445 /* Update the current position */
446 pc->xferred += bcount;
447 pc->cur_pos += bcount;
449 /* And set the interrupt handler again */
450 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
454 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
456 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
458 return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
459 get_timeout(scsi->pc), idescsi_expiry);
462 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
465 case READ_6: case READ_10: case READ_12:
466 pc->flags &= ~PC_FLAG_WRITING;
468 case WRITE_6: case WRITE_10: case WRITE_12:
469 pc->flags |= PC_FLAG_WRITING;
476 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
478 ide_hwif_t *hwif = drive->hwif;
479 struct scatterlist *sg, *scsi_sg;
482 if (!pc->req_xfer || pc->req_xfer % 1024)
485 if (idescsi_set_direction(pc))
489 scsi_sg = scsi_sglist(pc->scsi_cmd);
490 segments = scsi_sg_count(pc->scsi_cmd);
492 if (segments > hwif->sg_max_nents)
495 hwif->sg_nents = segments;
496 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
501 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
502 struct ide_atapi_pc *pc)
504 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
505 ide_hwif_t *hwif = drive->hwif;
509 /* Set the current packet command */
511 /* We haven't transferred any data yet */
513 pc->cur_pos = pc->buf;
514 /* Request to transfer the entire buffer at once */
515 bcount = min(pc->req_xfer, 63 * 1024);
517 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
519 dma = !hwif->dma_ops->dma_setup(drive);
523 ide_pktcmd_tf_load(drive, 0, bcount, dma);
526 pc->flags |= PC_FLAG_DMA_OK;
528 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
529 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
530 get_timeout(pc), idescsi_expiry);
533 /* Issue the packet command */
534 ide_execute_pkt_cmd(drive);
535 return idescsi_transfer_pc(drive);
540 * idescsi_do_request is our request handling function.
542 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
544 debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
545 rq->cmd[0], rq->errors);
546 debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
547 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
549 if (blk_sense_request(rq) || blk_special_request(rq)) {
550 return idescsi_issue_pc(drive,
551 (struct ide_atapi_pc *) rq->special);
553 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
554 idescsi_end_request (drive, 0, 0);
558 #ifdef CONFIG_IDE_PROC_FS
559 static void idescsi_add_settings(ide_drive_t *drive)
561 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
564 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
566 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
567 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
568 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
569 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
570 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
573 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
577 * Driver initialization.
579 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
581 if (drive->id && (drive->id->config & 0x0060) == 0x20)
582 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
583 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
584 #if IDESCSI_DEBUG_LOG
585 set_bit(IDESCSI_LOG_CMD, &scsi->log);
586 #endif /* IDESCSI_DEBUG_LOG */
587 idescsi_add_settings(drive);
590 static void ide_scsi_remove(ide_drive_t *drive)
592 struct Scsi_Host *scsihost = drive->driver_data;
593 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
594 struct gendisk *g = scsi->disk;
596 scsi_remove_host(scsihost);
597 ide_proc_unregister_driver(drive, scsi->driver);
599 ide_unregister_region(g);
601 drive->driver_data = NULL;
602 g->private_data = NULL;
610 static int ide_scsi_probe(ide_drive_t *);
612 #ifdef CONFIG_IDE_PROC_FS
613 static ide_proc_entry_t idescsi_proc[] = {
614 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
615 { NULL, 0, NULL, NULL }
619 static ide_driver_t idescsi_driver = {
621 .owner = THIS_MODULE,
623 .bus = &ide_bus_type,
625 .probe = ide_scsi_probe,
626 .remove = ide_scsi_remove,
627 .version = IDESCSI_VERSION,
629 .supports_dsc_overlap = 0,
630 .do_request = idescsi_do_request,
631 .end_request = idescsi_end_request,
632 .error = idescsi_atapi_error,
633 .abort = idescsi_atapi_abort,
634 #ifdef CONFIG_IDE_PROC_FS
635 .proc = idescsi_proc,
639 static int idescsi_ide_open(struct inode *inode, struct file *filp)
641 struct gendisk *disk = inode->i_bdev->bd_disk;
642 struct ide_scsi_obj *scsi;
644 if (!(scsi = ide_scsi_get(disk)))
650 static int idescsi_ide_release(struct inode *inode, struct file *filp)
652 struct gendisk *disk = inode->i_bdev->bd_disk;
653 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
660 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
661 unsigned int cmd, unsigned long arg)
663 struct block_device *bdev = inode->i_bdev;
664 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
665 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
668 static struct block_device_operations idescsi_ops = {
669 .owner = THIS_MODULE,
670 .open = idescsi_ide_open,
671 .release = idescsi_ide_release,
672 .ioctl = idescsi_ide_ioctl,
675 static int idescsi_slave_configure(struct scsi_device * sdp)
677 /* Configure detected device */
678 sdp->use_10_for_rw = 1;
679 sdp->use_10_for_ms = 1;
680 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
684 static const char *idescsi_info (struct Scsi_Host *host)
686 return "SCSI host adapter emulation for IDE ATAPI devices";
689 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
691 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
693 if (cmd == SG_SET_TRANSFORM) {
695 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
697 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
699 } else if (cmd == SG_GET_TRANSFORM)
700 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
704 static int idescsi_queue (struct scsi_cmnd *cmd,
705 void (*done)(struct scsi_cmnd *))
707 struct Scsi_Host *host = cmd->device->host;
708 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
709 ide_drive_t *drive = scsi->drive;
710 struct request *rq = NULL;
711 struct ide_atapi_pc *pc = NULL;
714 scmd_printk (KERN_ERR, cmd, "drive not present\n");
717 scsi = drive_to_idescsi(drive);
718 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
719 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
720 if (rq == NULL || pc == NULL) {
721 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
725 memset (pc->c, 0, 12);
727 if (cmd->sc_data_direction == DMA_TO_DEVICE)
728 pc->flags |= PC_FLAG_WRITING;
730 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
732 pc->sg = scsi_sglist(cmd);
733 pc->sg_cnt = scsi_sg_count(cmd);
735 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
738 pc->timeout = jiffies + cmd->timeout_per_command;
740 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
741 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
742 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
743 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
744 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
745 ide_scsi_hex_dump(pc->c, 12);
749 blk_rq_init(NULL, rq);
750 rq->special = (char *) pc;
751 rq->cmd_type = REQ_TYPE_SPECIAL;
752 spin_unlock_irq(host->host_lock);
753 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
754 spin_lock_irq(host->host_lock);
759 cmd->result = DID_ERROR << 16;
764 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
766 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
767 ide_drive_t *drive = scsi->drive;
771 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
773 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
774 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
777 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
782 /* First give it some more time, how much is "right" is hard to say :-( */
784 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
785 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
786 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
788 spin_lock_irq(&ide_lock);
790 /* If there is no pc running we're done (our interrupt took care of it) */
796 /* It's somewhere in flight. Does ide subsystem agree? */
797 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
798 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
800 * FIXME - not sure this condition can ever occur
802 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
804 if (blk_sense_request(scsi->pc->rq))
805 kfree(scsi->pc->buf);
814 spin_unlock_irq(&ide_lock);
816 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
817 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
822 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
825 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
826 ide_drive_t *drive = scsi->drive;
830 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
832 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
833 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
836 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
841 spin_lock_irq(cmd->device->host->host_lock);
842 spin_lock(&ide_lock);
844 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
845 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
846 spin_unlock(&ide_lock);
847 spin_unlock_irq(cmd->device->host->host_lock);
851 /* kill current request */
852 if (__blk_end_request(req, -EIO, 0))
854 if (blk_sense_request(req))
855 kfree(scsi->pc->buf);
860 /* now nuke the drive queue */
861 while ((req = elv_next_request(drive->queue))) {
862 if (__blk_end_request(req, -EIO, 0))
866 HWGROUP(drive)->rq = NULL;
867 HWGROUP(drive)->handler = NULL;
868 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
869 spin_unlock(&ide_lock);
873 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
876 spin_unlock_irq(cmd->device->host->host_lock);
878 spin_lock_irq(cmd->device->host->host_lock);
879 } while ( HWGROUP(drive)->handler );
881 ready = drive_is_ready(drive);
882 HWGROUP(drive)->busy--;
884 printk (KERN_ERR "ide-scsi: reset failed!\n");
888 spin_unlock_irq(cmd->device->host->host_lock);
892 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
893 sector_t capacity, int *parm)
895 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
896 ide_drive_t *drive = idescsi->drive;
898 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
899 parm[0] = drive->bios_head;
900 parm[1] = drive->bios_sect;
901 parm[2] = drive->bios_cyl;
906 static struct scsi_host_template idescsi_template = {
907 .module = THIS_MODULE,
909 .info = idescsi_info,
910 .slave_configure = idescsi_slave_configure,
911 .ioctl = idescsi_ioctl,
912 .queuecommand = idescsi_queue,
913 .eh_abort_handler = idescsi_eh_abort,
914 .eh_host_reset_handler = idescsi_eh_reset,
915 .bios_param = idescsi_bios,
921 .use_clustering = DISABLE_CLUSTERING,
923 .proc_name = "ide-scsi",
926 static int ide_scsi_probe(ide_drive_t *drive)
928 idescsi_scsi_t *idescsi;
929 struct Scsi_Host *host;
934 if (!warned && drive->media == ide_cdrom) {
935 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
939 if (idescsi_nocd && drive->media == ide_cdrom)
942 if (!strstr("ide-scsi", drive->driver_req) ||
944 drive->media == ide_disk ||
945 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
950 g = alloc_disk(1 << PARTN_BITS);
954 ide_init_disk(g, drive);
958 if (drive->id->last_lun)
959 debug_log("%s: id->last_lun=%u\n", drive->name,
960 drive->id->last_lun);
962 if ((drive->id->last_lun & 0x7) != 7)
963 host->max_lun = (drive->id->last_lun & 0x7) + 1;
967 drive->driver_data = host;
968 idescsi = scsihost_to_idescsi(host);
969 idescsi->drive = drive;
970 idescsi->driver = &idescsi_driver;
971 idescsi->host = host;
973 g->private_data = &idescsi->driver;
974 ide_proc_register_driver(drive, &idescsi_driver);
976 idescsi_setup(drive, idescsi);
977 g->fops = &idescsi_ops;
978 ide_register_region(g);
979 err = scsi_add_host(host, &drive->gendev);
981 scsi_scan_host(host);
984 /* fall through on error */
985 ide_unregister_region(g);
986 ide_proc_unregister_driver(drive, &idescsi_driver);
995 static int __init init_idescsi_module(void)
997 return driver_register(&idescsi_driver.gen_driver);
1000 static void __exit exit_idescsi_module(void)
1002 driver_unregister(&idescsi_driver.gen_driver);
1005 module_param(idescsi_nocd, int, 0600);
1006 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1007 module_init(init_idescsi_module);
1008 module_exit(exit_idescsi_module);
1009 MODULE_LICENSE("GPL");