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_end_request(ide_drive_t *, int, int);
188 static void ide_scsi_callback(ide_drive_t *drive)
190 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
191 struct ide_atapi_pc *pc = scsi->pc;
193 if (pc->flags & PC_FLAG_TIMEDOUT)
194 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
195 pc->scsi_cmd->serial_number, jiffies);
196 /* end this request now - scsi should retry it*/
197 else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
198 printk(KERN_INFO "Packet command completed, %d bytes"
199 " transferred\n", pc->xferred);
201 idescsi_end_request(drive, 1, 0);
204 static int idescsi_check_condition(ide_drive_t *drive,
205 struct request *failed_cmd)
207 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
208 struct ide_atapi_pc *pc;
212 /* stuff a sense request in front of our current request */
213 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
214 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
215 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
216 if (!pc || !rq || !buf) {
222 blk_rq_init(NULL, rq);
223 rq->special = (char *) pc;
226 pc->c[0] = REQUEST_SENSE;
227 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
228 rq->cmd_type = REQ_TYPE_SENSE;
229 rq->cmd_flags |= REQ_PREEMPT;
230 pc->timeout = jiffies + WAIT_READY;
231 pc->callback = ide_scsi_callback;
232 /* NOTE! Save the failed packet command in "rq->buffer" */
233 rq->buffer = (void *) failed_cmd->special;
234 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
235 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
236 printk ("ide-scsi: %s: queue cmd = ", drive->name);
237 ide_scsi_hex_dump(pc->c, 6);
239 rq->rq_disk = scsi->disk;
240 ide_do_drive_cmd(drive, rq);
244 static ide_startstop_t
245 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
247 ide_hwif_t *hwif = drive->hwif;
249 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
251 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
252 hwif->io_ports.command_addr);
256 idescsi_end_request(drive, 0, 0);
261 static ide_startstop_t
262 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
264 debug_log("%s called for %lu\n", __func__,
265 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
267 rq->errors |= ERROR_MAX;
269 idescsi_end_request(drive, 0, 0);
274 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
276 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
277 struct request *rq = HWGROUP(drive)->rq;
278 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
279 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
280 struct Scsi_Host *host;
281 int errors = rq->errors;
284 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
285 ide_end_request(drive, uptodate, nrsecs);
288 ide_end_drive_cmd (drive, 0, 0);
289 if (blk_sense_request(rq)) {
290 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
292 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
293 ide_scsi_hex_dump(pc->buf, 16);
295 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
296 SCSI_SENSE_BUFFERSIZE);
302 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
303 (((pc->flags & PC_FLAG_TIMEDOUT) ?
306 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
308 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
309 drive->name, pc->scsi_cmd->serial_number);
310 pc->scsi_cmd->result = DID_TIME_OUT << 16;
311 } else if (errors >= ERROR_MAX) {
312 pc->scsi_cmd->result = DID_ERROR << 16;
314 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
317 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
318 if (!idescsi_check_condition(drive, rq))
319 /* we started a request sense, so we'll be back, exit for now */
321 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
323 pc->scsi_cmd->result = DID_OK << 16;
325 host = pc->scsi_cmd->device->host;
326 spin_lock_irqsave(host->host_lock, flags);
327 pc->done(pc->scsi_cmd);
328 spin_unlock_irqrestore(host->host_lock, flags);
335 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
337 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
340 static int idescsi_expiry(ide_drive_t *drive)
342 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
343 struct ide_atapi_pc *pc = scsi->pc;
345 debug_log("%s called for %lu at %lu\n", __func__,
346 pc->scsi_cmd->serial_number, jiffies);
348 pc->flags |= PC_FLAG_TIMEDOUT;
350 return 0; /* we do not want the ide subsystem to retry */
354 * Our interrupt handler.
356 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
358 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
359 ide_hwif_t *hwif = drive->hwif;
360 struct ide_atapi_pc *pc = scsi->pc;
361 struct request *rq = pc->rq;
362 xfer_func_t *xferfunc;
367 debug_log("Reached %s interrupt handler\n", __func__);
369 if (pc->flags & PC_FLAG_TIMEDOUT) {
373 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
374 if (hwif->dma_ops->dma_end(drive))
375 pc->flags |= PC_FLAG_DMA_ERROR;
377 pc->xferred = pc->req_xfer;
378 debug_log("%s: DMA finished\n", drive->name);
381 /* Clear the interrupt */
382 stat = ide_read_status(drive);
384 if ((stat & DRQ_STAT) == 0) {
385 /* No more interrupts */
386 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
387 local_irq_enable_in_hardirq();
388 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
393 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
394 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
395 printk(KERN_ERR "%s: The device wants to issue more interrupts "
396 "in DMA mode\n", drive->name);
398 return ide_do_reset(drive);
400 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
401 hwif->INB(hwif->io_ports.lbam_addr);
402 ireason = hwif->INB(hwif->io_ports.nsect_addr);
405 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
406 return ide_do_reset (drive);
408 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
409 /* Hopefully, we will never get here */
410 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
411 "to %s!\n", drive->name,
412 (ireason & IO) ? "Write" : "Read",
413 (ireason & IO) ? "Read" : "Write");
414 return ide_do_reset(drive);
416 if (!(pc->flags & PC_FLAG_WRITING)) {
417 temp = pc->xferred + bcount;
418 if (temp > pc->req_xfer) {
419 if (temp > pc->buf_size) {
420 printk(KERN_ERR "%s: The device wants to send "
421 "us more data than expected - "
424 temp = pc->buf_size - pc->xferred;
427 ide_scsi_io_buffers(drive, pc,
430 hwif->input_data(drive, NULL,
432 printk(KERN_ERR "%s: transferred %d of "
439 ide_pad_transfer(drive, 0, bcount - temp);
440 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
443 debug_log("The device wants to send us more data than "
444 "expected - allowing transfer\n");
446 xferfunc = hwif->input_data;
448 xferfunc = hwif->output_data;
451 ide_scsi_io_buffers(drive, pc, bcount,
452 !!(pc->flags & PC_FLAG_WRITING));
454 xferfunc(drive, NULL, pc->cur_pos, bcount);
456 /* Update the current position */
457 pc->xferred += bcount;
458 pc->cur_pos += bcount;
460 /* And set the interrupt handler again */
461 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
465 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
467 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
469 return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
470 get_timeout(scsi->pc), idescsi_expiry);
473 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
476 case READ_6: case READ_10: case READ_12:
477 pc->flags &= ~PC_FLAG_WRITING;
479 case WRITE_6: case WRITE_10: case WRITE_12:
480 pc->flags |= PC_FLAG_WRITING;
487 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
489 ide_hwif_t *hwif = drive->hwif;
490 struct scatterlist *sg, *scsi_sg;
493 if (!pc->req_xfer || pc->req_xfer % 1024)
496 if (idescsi_set_direction(pc))
500 scsi_sg = scsi_sglist(pc->scsi_cmd);
501 segments = scsi_sg_count(pc->scsi_cmd);
503 if (segments > hwif->sg_max_nents)
506 hwif->sg_nents = segments;
507 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
512 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
513 struct ide_atapi_pc *pc)
515 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
517 /* Set the current packet command */
520 return ide_issue_pc(drive, pc, idescsi_transfer_pc,
521 get_timeout(pc), idescsi_expiry);
525 * idescsi_do_request is our request handling function.
527 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
529 debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
530 rq->cmd[0], rq->errors);
531 debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
532 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
534 if (blk_sense_request(rq) || blk_special_request(rq)) {
535 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
536 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
538 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags))
539 pc->flags |= PC_FLAG_DRQ_INTERRUPT;
541 if (drive->using_dma && !idescsi_map_sg(drive, pc))
542 pc->flags |= PC_FLAG_DMA_OK;
544 return idescsi_issue_pc(drive, pc);
546 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
547 idescsi_end_request (drive, 0, 0);
551 #ifdef CONFIG_IDE_PROC_FS
552 static void idescsi_add_settings(ide_drive_t *drive)
554 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
557 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
559 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
560 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
561 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
562 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
563 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
566 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
570 * Driver initialization.
572 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
574 if (drive->id && (drive->id->config & 0x0060) == 0x20)
575 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
576 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
577 #if IDESCSI_DEBUG_LOG
578 set_bit(IDESCSI_LOG_CMD, &scsi->log);
579 #endif /* IDESCSI_DEBUG_LOG */
580 idescsi_add_settings(drive);
583 static void ide_scsi_remove(ide_drive_t *drive)
585 struct Scsi_Host *scsihost = drive->driver_data;
586 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
587 struct gendisk *g = scsi->disk;
589 scsi_remove_host(scsihost);
590 ide_proc_unregister_driver(drive, scsi->driver);
592 ide_unregister_region(g);
594 drive->driver_data = NULL;
595 g->private_data = NULL;
603 static int ide_scsi_probe(ide_drive_t *);
605 #ifdef CONFIG_IDE_PROC_FS
606 static ide_proc_entry_t idescsi_proc[] = {
607 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
608 { NULL, 0, NULL, NULL }
612 static ide_driver_t idescsi_driver = {
614 .owner = THIS_MODULE,
616 .bus = &ide_bus_type,
618 .probe = ide_scsi_probe,
619 .remove = ide_scsi_remove,
620 .version = IDESCSI_VERSION,
622 .supports_dsc_overlap = 0,
623 .do_request = idescsi_do_request,
624 .end_request = idescsi_end_request,
625 .error = idescsi_atapi_error,
626 .abort = idescsi_atapi_abort,
627 #ifdef CONFIG_IDE_PROC_FS
628 .proc = idescsi_proc,
632 static int idescsi_ide_open(struct inode *inode, struct file *filp)
634 struct gendisk *disk = inode->i_bdev->bd_disk;
635 struct ide_scsi_obj *scsi;
637 if (!(scsi = ide_scsi_get(disk)))
643 static int idescsi_ide_release(struct inode *inode, struct file *filp)
645 struct gendisk *disk = inode->i_bdev->bd_disk;
646 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
653 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
654 unsigned int cmd, unsigned long arg)
656 struct block_device *bdev = inode->i_bdev;
657 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
658 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
661 static struct block_device_operations idescsi_ops = {
662 .owner = THIS_MODULE,
663 .open = idescsi_ide_open,
664 .release = idescsi_ide_release,
665 .ioctl = idescsi_ide_ioctl,
668 static int idescsi_slave_configure(struct scsi_device * sdp)
670 /* Configure detected device */
671 sdp->use_10_for_rw = 1;
672 sdp->use_10_for_ms = 1;
673 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
677 static const char *idescsi_info (struct Scsi_Host *host)
679 return "SCSI host adapter emulation for IDE ATAPI devices";
682 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
684 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
686 if (cmd == SG_SET_TRANSFORM) {
688 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
690 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
692 } else if (cmd == SG_GET_TRANSFORM)
693 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
697 static int idescsi_queue (struct scsi_cmnd *cmd,
698 void (*done)(struct scsi_cmnd *))
700 struct Scsi_Host *host = cmd->device->host;
701 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
702 ide_drive_t *drive = scsi->drive;
703 struct request *rq = NULL;
704 struct ide_atapi_pc *pc = NULL;
707 scmd_printk (KERN_ERR, cmd, "drive not present\n");
710 scsi = drive_to_idescsi(drive);
711 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
712 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
713 if (rq == NULL || pc == NULL) {
714 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
718 memset (pc->c, 0, 12);
720 if (cmd->sc_data_direction == DMA_TO_DEVICE)
721 pc->flags |= PC_FLAG_WRITING;
723 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
725 pc->sg = scsi_sglist(cmd);
726 pc->sg_cnt = scsi_sg_count(cmd);
728 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
731 pc->timeout = jiffies + cmd->timeout_per_command;
732 pc->callback = ide_scsi_callback;
734 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
735 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
736 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
737 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
738 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
739 ide_scsi_hex_dump(pc->c, 12);
743 blk_rq_init(NULL, rq);
744 rq->special = (char *) pc;
745 rq->cmd_type = REQ_TYPE_SPECIAL;
746 spin_unlock_irq(host->host_lock);
747 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
748 spin_lock_irq(host->host_lock);
753 cmd->result = DID_ERROR << 16;
758 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
760 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
761 ide_drive_t *drive = scsi->drive;
765 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
767 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
768 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
771 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
776 /* First give it some more time, how much is "right" is hard to say :-( */
778 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
779 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
780 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
782 spin_lock_irq(&ide_lock);
784 /* If there is no pc running we're done (our interrupt took care of it) */
790 /* It's somewhere in flight. Does ide subsystem agree? */
791 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
792 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
794 * FIXME - not sure this condition can ever occur
796 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
798 if (blk_sense_request(scsi->pc->rq))
799 kfree(scsi->pc->buf);
808 spin_unlock_irq(&ide_lock);
810 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
811 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
816 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
819 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
820 ide_drive_t *drive = scsi->drive;
824 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
826 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
827 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
830 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
835 spin_lock_irq(cmd->device->host->host_lock);
836 spin_lock(&ide_lock);
838 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
839 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
840 spin_unlock(&ide_lock);
841 spin_unlock_irq(cmd->device->host->host_lock);
845 /* kill current request */
846 if (__blk_end_request(req, -EIO, 0))
848 if (blk_sense_request(req))
849 kfree(scsi->pc->buf);
854 /* now nuke the drive queue */
855 while ((req = elv_next_request(drive->queue))) {
856 if (__blk_end_request(req, -EIO, 0))
860 HWGROUP(drive)->rq = NULL;
861 HWGROUP(drive)->handler = NULL;
862 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
863 spin_unlock(&ide_lock);
867 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
870 spin_unlock_irq(cmd->device->host->host_lock);
872 spin_lock_irq(cmd->device->host->host_lock);
873 } while ( HWGROUP(drive)->handler );
875 ready = drive_is_ready(drive);
876 HWGROUP(drive)->busy--;
878 printk (KERN_ERR "ide-scsi: reset failed!\n");
882 spin_unlock_irq(cmd->device->host->host_lock);
886 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
887 sector_t capacity, int *parm)
889 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
890 ide_drive_t *drive = idescsi->drive;
892 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
893 parm[0] = drive->bios_head;
894 parm[1] = drive->bios_sect;
895 parm[2] = drive->bios_cyl;
900 static struct scsi_host_template idescsi_template = {
901 .module = THIS_MODULE,
903 .info = idescsi_info,
904 .slave_configure = idescsi_slave_configure,
905 .ioctl = idescsi_ioctl,
906 .queuecommand = idescsi_queue,
907 .eh_abort_handler = idescsi_eh_abort,
908 .eh_host_reset_handler = idescsi_eh_reset,
909 .bios_param = idescsi_bios,
915 .use_clustering = DISABLE_CLUSTERING,
917 .proc_name = "ide-scsi",
920 static int ide_scsi_probe(ide_drive_t *drive)
922 idescsi_scsi_t *idescsi;
923 struct Scsi_Host *host;
928 if (!warned && drive->media == ide_cdrom) {
929 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
933 if (idescsi_nocd && drive->media == ide_cdrom)
936 if (!strstr("ide-scsi", drive->driver_req) ||
938 drive->media == ide_disk ||
939 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
944 g = alloc_disk(1 << PARTN_BITS);
948 ide_init_disk(g, drive);
952 if (drive->id->last_lun)
953 debug_log("%s: id->last_lun=%u\n", drive->name,
954 drive->id->last_lun);
956 if ((drive->id->last_lun & 0x7) != 7)
957 host->max_lun = (drive->id->last_lun & 0x7) + 1;
961 drive->driver_data = host;
962 idescsi = scsihost_to_idescsi(host);
963 idescsi->drive = drive;
964 idescsi->driver = &idescsi_driver;
965 idescsi->host = host;
967 g->private_data = &idescsi->driver;
968 ide_proc_register_driver(drive, &idescsi_driver);
970 idescsi_setup(drive, idescsi);
971 g->fops = &idescsi_ops;
972 ide_register_region(g);
973 err = scsi_add_host(host, &drive->gendev);
975 scsi_scan_host(host);
978 /* fall through on error */
979 ide_unregister_region(g);
980 ide_proc_unregister_driver(drive, &idescsi_driver);
989 static int __init init_idescsi_module(void)
991 return driver_register(&idescsi_driver.gen_driver);
994 static void __exit exit_idescsi_module(void)
996 driver_unregister(&idescsi_driver.gen_driver);
999 module_param(idescsi_nocd, int, 0600);
1000 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1001 module_init(init_idescsi_module);
1002 module_exit(exit_idescsi_module);
1003 MODULE_LICENSE("GPL");