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[SCSI] allow sleeping in ->eh_bus_reset_handler()
[linux-2.6-block.git] / drivers / scsi / ide-scsi.c
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1da177e4
LT		 1/*
2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
3 *
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5 */
6
7/*
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 *
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
12 *
13 * Ver 0.1 Dec 3 96 Initial version.
14 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
15 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16 * to Janos Farkas for pointing this out.
17 * Avoid using bitfields in structures for m68k.
18 * Added Scatter/Gather and DMA support.
19 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
20 * Use variable timeout for each command.
21 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
22 * Allow disabling of SCSI-6 to SCSI-10 transformation.
23 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
24 * for access through /dev/sg.
25 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
27 * detection of devices with CONFIG_SCSI_MULTI_LUN
28 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
29 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
30 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
31 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
32 */
33
34#define IDESCSI_VERSION "0.92"
35
36#include <linux/module.h>
37#include <linux/config.h>
38#include <linux/types.h>
39#include <linux/string.h>
40#include <linux/kernel.h>
41#include <linux/mm.h>
42#include <linux/ioport.h>
43#include <linux/blkdev.h>
44#include <linux/errno.h>
45#include <linux/hdreg.h>
46#include <linux/slab.h>
47#include <linux/ide.h>
48#include <linux/scatterlist.h>
49
50#include <asm/io.h>
51#include <asm/bitops.h>
52#include <asm/uaccess.h>
53
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>
59#include <scsi/sg.h>
60
61#define IDESCSI_DEBUG_LOG 0
62
63typedef struct idescsi_pc_s {
64 u8 c[12]; /* Actual packet bytes */
65 int request_transfer; /* Bytes to transfer */
66 int actually_transferred; /* Bytes actually transferred */
67 int buffer_size; /* Size of our data buffer */
68 struct request *rq; /* The corresponding request */
69 u8 *buffer; /* Data buffer */
70 u8 *current_position; /* Pointer into the above buffer */
71 struct scatterlist *sg; /* Scatter gather table */
72 int b_count; /* Bytes transferred from current entry */
73 struct scsi_cmnd *scsi_cmd; /* SCSI command */
74 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
75 unsigned long flags; /* Status/Action flags */
76 unsigned long timeout; /* Command timeout */
77} idescsi_pc_t;
78
79/*
80 * Packet command status bits.
81 */
82#define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
83#define PC_WRITING 1 /* Data direction */
84#define PC_TRANSFORM 2 /* transform SCSI commands */
85#define PC_TIMEDOUT 3 /* command timed out */
86#define PC_DMA_OK 4 /* Use DMA */
87
88/*
89 * SCSI command transformation layer
90 */
91#define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */
92#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
93
94/*
95 * Log flags
96 */
97#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
98
99typedef struct ide_scsi_obj {
100 ide_drive_t *drive;
101 ide_driver_t *driver;
102 struct gendisk *disk;
103 struct Scsi_Host *host;
104
105 idescsi_pc_t *pc; /* Current packet command */
106 unsigned long flags; /* Status/Action flags */
107 unsigned long transform; /* SCSI cmd translation layer */
108 unsigned long log; /* log flags */
109} idescsi_scsi_t;
110
111static DECLARE_MUTEX(idescsi_ref_sem);
112
113#define ide_scsi_g(disk) \
114 container_of((disk)->private_data, struct ide_scsi_obj, driver)
115
116static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
117{
118 struct ide_scsi_obj *scsi = NULL;
119
120 down(&idescsi_ref_sem);
121 scsi = ide_scsi_g(disk);
122 if (scsi)
123 scsi_host_get(scsi->host);
124 up(&idescsi_ref_sem);
125 return scsi;
126}
127
128static void ide_scsi_put(struct ide_scsi_obj *scsi)
129{
130 down(&idescsi_ref_sem);
131 scsi_host_put(scsi->host);
132 up(&idescsi_ref_sem);
133}
134
135static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
136{
137 return (idescsi_scsi_t*) (&host[1]);
138}
139
140static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
141{
142 return scsihost_to_idescsi(ide_drive->driver_data);
143}
144
145/*
146 * Per ATAPI device status bits.
147 */
148#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
149
150/*
151 * ide-scsi requests.
152 */
153#define IDESCSI_PC_RQ 90
154
155static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
156{
157 while (bcount--)
158 (void) HWIF(drive)->INB(IDE_DATA_REG);
159}
160
161static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
162{
163 while (bcount--)
164 HWIF(drive)->OUTB(0, IDE_DATA_REG);
165}
166
167/*
168 * PIO data transfer routines using the scatter gather table.
169 */
170static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
171{
172 int count;
173 char *buf;
174
175 while (bcount) {
176 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
177 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
178 idescsi_discard_data (drive, bcount);
179 return;
180 }
181 count = min(pc->sg->length - pc->b_count, bcount);
41bb4c43
SH		 182 if (PageHighMem(pc->sg->page)) {
183 unsigned long flags;
184
185 local_irq_save(flags);
186 buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
187 drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
188 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
189 local_irq_restore(flags);
190 } else {
191 buf = page_address(pc->sg->page) + pc->sg->offset;
192 drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
193 }
1da177e4
LT		 194 bcount -= count; pc->b_count += count;
195 if (pc->b_count == pc->sg->length) {
196 pc->sg++;
197 pc->b_count = 0;
198 }
199 }
200}
201
202static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
203{
204 int count;
205 char *buf;
206
207 while (bcount) {
208 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
209 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
210 idescsi_output_zeros (drive, bcount);
211 return;
212 }
213 count = min(pc->sg->length - pc->b_count, bcount);
41bb4c43
SH		 214 if (PageHighMem(pc->sg->page)) {
215 unsigned long flags;
216
217 local_irq_save(flags);
218 buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
219 drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
220 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
221 local_irq_restore(flags);
222 } else {
223 buf = page_address(pc->sg->page) + pc->sg->offset;
224 drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
225 }
1da177e4
LT		 226 bcount -= count; pc->b_count += count;
227 if (pc->b_count == pc->sg->length) {
228 pc->sg++;
229 pc->b_count = 0;
230 }
231 }
232}
233
234/*
235 * Most of the SCSI commands are supported directly by ATAPI devices.
236 * idescsi_transform_pc handles the few exceptions.
237 */
238static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
239{
240 u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
241 char *atapi_buf;
242
243 if (!test_bit(PC_TRANSFORM, &pc->flags))
244 return;
245 if (drive->media == ide_cdrom || drive->media == ide_optical) {
246 if (c[0] == READ_6 || c[0] == WRITE_6) {
247 c[8] = c[4]; c[5] = c[3]; c[4] = c[2];
248 c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0;
249 c[0] += (READ_10 - READ_6);
250 }
251 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
252 unsigned short new_len;
253 if (!scsi_buf)
254 return;
255 if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
256 return;
257 memset(atapi_buf, 0, pc->buffer_size + 4);
258 memset (c, 0, 12);
259 c[0] = sc[0] | 0x40;
260 c[1] = sc[1];
261 c[2] = sc[2];
262 new_len = sc[4] + 4;
263 c[8] = new_len;
264 c[7] = new_len >> 8;
265 c[9] = sc[5];
266 if (c[0] == MODE_SELECT_10) {
267 atapi_buf[1] = scsi_buf[0]; /* Mode data length */
268 atapi_buf[2] = scsi_buf[1]; /* Medium type */
269 atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */
270 atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */
271 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
272 }
273 pc->buffer = atapi_buf;
274 pc->request_transfer += 4;
275 pc->buffer_size += 4;
276 }
277 }
278}
279
280static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
281{
282 u8 *atapi_buf = pc->buffer;
283 u8 *sc = pc->scsi_cmd->cmnd;
284 u8 *scsi_buf = pc->scsi_cmd->request_buffer;
285
286 if (!test_bit(PC_TRANSFORM, &pc->flags))
287 return;
288 if (drive->media == ide_cdrom || drive->media == ide_optical) {
289 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
290 scsi_buf[0] = atapi_buf[1]; /* Mode data length */
291 scsi_buf[1] = atapi_buf[2]; /* Medium type */
292 scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */
293 scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */
294 memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
295 }
296 if (pc->c[0] == INQUIRY) {
297 scsi_buf[2] |= 2; /* ansi_revision */
298 scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
299 }
300 }
301 if (atapi_buf && atapi_buf != scsi_buf)
302 kfree(atapi_buf);
303}
304
305static void hexdump(u8 *x, int len)
306{
307 int i;
308
309 printk("[ ");
310 for (i = 0; i < len; i++)
311 printk("%x ", x[i]);
312 printk("]\n");
313}
314
315static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
316{
317 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
318 idescsi_pc_t *pc;
319 struct request *rq;
320 u8 *buf;
321
322 /* stuff a sense request in front of our current request */
323 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
324 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
325 buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
326 if (pc == NULL || rq == NULL || buf == NULL) {
327 if (pc) kfree(pc);
328 if (rq) kfree(rq);
329 if (buf) kfree(buf);
330 return -ENOMEM;
331 }
332 memset (pc, 0, sizeof (idescsi_pc_t));
333 memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
334 ide_init_drive_cmd(rq);
335 rq->special = (char *) pc;
336 pc->rq = rq;
337 pc->buffer = buf;
338 pc->c[0] = REQUEST_SENSE;
339 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
340 rq->flags = REQ_SENSE;
341 pc->timeout = jiffies + WAIT_READY;
342 /* NOTE! Save the failed packet command in "rq->buffer" */
343 rq->buffer = (void *) failed_command->special;
344 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
345 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
346 printk ("ide-scsi: %s: queue cmd = ", drive->name);
347 hexdump(pc->c, 6);
348 }
349 rq->rq_disk = scsi->disk;
350 return ide_do_drive_cmd(drive, rq, ide_preempt);
351}
352
353static int idescsi_end_request(ide_drive_t *, int, int);
354
355static ide_startstop_t
356idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
357{
358 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
359 /* force an abort */
360 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
361
362 rq->errors++;
363
364 idescsi_end_request(drive, 0, 0);
365
366 return ide_stopped;
367}
368
369static ide_startstop_t
370idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
371{
372#if IDESCSI_DEBUG_LOG
373 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
374 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
375#endif
376 rq->errors |= ERROR_MAX;
377
378 idescsi_end_request(drive, 0, 0);
379
380 return ide_stopped;
381}
382
383static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
384{
385 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
386 struct request *rq = HWGROUP(drive)->rq;
387 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
388 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
389 struct Scsi_Host *host;
390 u8 *scsi_buf;
391 unsigned long flags;
392
393 if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
394 ide_end_request(drive, uptodate, nrsecs);
395 return 0;
396 }
397 ide_end_drive_cmd (drive, 0, 0);
398 if (rq->flags & REQ_SENSE) {
399 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
400 if (log) {
401 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
402 hexdump(pc->buffer,16);
403 }
404 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
405 kfree(pc->buffer);
406 kfree(pc);
407 kfree(rq);
408 pc = opc;
409 rq = pc->rq;
410 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
411 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
412 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
413 if (log)
414 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
415 drive->name, pc->scsi_cmd->serial_number);
416 pc->scsi_cmd->result = DID_TIME_OUT << 16;
417 } else if (rq->errors >= ERROR_MAX) {
418 pc->scsi_cmd->result = DID_ERROR << 16;
419 if (log)
420 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
421 } else if (rq->errors) {
422 if (log)
423 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
424 if (!idescsi_check_condition(drive, rq))
425 /* we started a request sense, so we'll be back, exit for now */
426 return 0;
427 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
428 } else {
429 pc->scsi_cmd->result = DID_OK << 16;
430 idescsi_transform_pc2 (drive, pc);
431 if (log) {
432 printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
433 if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
434 printk(", rst = ");
435 scsi_buf = pc->scsi_cmd->request_buffer;
436 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
437 } else printk("\n");
438 }
439 }
440 host = pc->scsi_cmd->device->host;
441 spin_lock_irqsave(host->host_lock, flags);
442 pc->done(pc->scsi_cmd);
443 spin_unlock_irqrestore(host->host_lock, flags);
444 kfree(pc);
445 kfree(rq);
446 scsi->pc = NULL;
447 return 0;
448}
449
450static inline unsigned long get_timeout(idescsi_pc_t *pc)
451{
452 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
453}
454
455static int idescsi_expiry(ide_drive_t *drive)
456{
457 idescsi_scsi_t *scsi = drive->driver_data;
458 idescsi_pc_t *pc = scsi->pc;
459
460#if IDESCSI_DEBUG_LOG
461 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
462#endif
463 set_bit(PC_TIMEDOUT, &pc->flags);
464
465 return 0; /* we do not want the ide subsystem to retry */
466}
467
468/*
469 * Our interrupt handler.
470 */
471static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
472{
473 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
474 idescsi_pc_t *pc=scsi->pc;
475 struct request *rq = pc->rq;
476 atapi_bcount_t bcount;
477 atapi_status_t status;
478 atapi_ireason_t ireason;
479 atapi_feature_t feature;
480
481 unsigned int temp;
482
483#if IDESCSI_DEBUG_LOG
484 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
485#endif /* IDESCSI_DEBUG_LOG */
486
487 if (test_bit(PC_TIMEDOUT, &pc->flags)){
488#if IDESCSI_DEBUG_LOG
489 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
490 pc->scsi_cmd->serial_number, jiffies);
491#endif
492 /* end this request now - scsi should retry it*/
493 idescsi_end_request (drive, 1, 0);
494 return ide_stopped;
495 }
496 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
497#if IDESCSI_DEBUG_LOG
498 printk ("ide-scsi: %s: DMA complete\n", drive->name);
499#endif /* IDESCSI_DEBUG_LOG */
500 pc->actually_transferred=pc->request_transfer;
501 (void) HWIF(drive)->ide_dma_end(drive);
502 }
503
504 feature.all = 0;
505 /* Clear the interrupt */
506 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
507
508 if (!status.b.drq) {
509 /* No more interrupts */
510 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
511 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
512 local_irq_enable();
513 if (status.b.check)
514 rq->errors++;
515 idescsi_end_request (drive, 1, 0);
516 return ide_stopped;
517 }
518 bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
519 bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
520 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
521
522 if (ireason.b.cod) {
523 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
524 return ide_do_reset (drive);
525 }
526 if (ireason.b.io) {
527 temp = pc->actually_transferred + bcount.all;
528 if (temp > pc->request_transfer) {
529 if (temp > pc->buffer_size) {
530 printk(KERN_ERR "ide-scsi: The scsi wants to "
531 "send us more data than expected "
532 "- discarding data\n");
533 temp = pc->buffer_size - pc->actually_transferred;
534 if (temp) {
535 clear_bit(PC_WRITING, &pc->flags);
536 if (pc->sg)
537 idescsi_input_buffers(drive, pc, temp);
538 else
539 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
540 printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
541 }
542 pc->actually_transferred += temp;
543 pc->current_position += temp;
544 idescsi_discard_data(drive, bcount.all - temp);
545 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
546 return ide_started;
547 }
548#if IDESCSI_DEBUG_LOG
549 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
550#endif /* IDESCSI_DEBUG_LOG */
551 }
552 }
553 if (ireason.b.io) {
554 clear_bit(PC_WRITING, &pc->flags);
555 if (pc->sg)
556 idescsi_input_buffers(drive, pc, bcount.all);
557 else
558 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
559 } else {
560 set_bit(PC_WRITING, &pc->flags);
561 if (pc->sg)
562 idescsi_output_buffers (drive, pc, bcount.all);
563 else
564 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
565 }
566 /* Update the current position */
567 pc->actually_transferred += bcount.all;
568 pc->current_position += bcount.all;
569
570 /* And set the interrupt handler again */
571 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
572 return ide_started;
573}
574
575static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
576{
577 ide_hwif_t *hwif = drive->hwif;
578 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
579 idescsi_pc_t *pc = scsi->pc;
580 atapi_ireason_t ireason;
581 ide_startstop_t startstop;
582
583 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
584 printk(KERN_ERR "ide-scsi: Strange, packet command "
585 "initiated yet DRQ isn't asserted\n");
586 return startstop;
587 }
588 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
589 if (!ireason.b.cod || ireason.b.io) {
590 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
591 "issuing a packet command\n");
592 return ide_do_reset (drive);
593 }
594 if (HWGROUP(drive)->handler != NULL)
595 BUG();
596 /* Set the interrupt routine */
597 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
598 /* Send the actual packet */
599 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
600 if (test_bit (PC_DMA_OK, &pc->flags)) {
601 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
602 hwif->dma_start(drive);
603 }
604 return ide_started;
605}
606
607static inline int idescsi_set_direction(idescsi_pc_t *pc)
608{
609 switch (pc->c[0]) {
610 case READ_6: case READ_10: case READ_12:
611 clear_bit(PC_WRITING, &pc->flags);
612 return 0;
613 case WRITE_6: case WRITE_10: case WRITE_12:
614 set_bit(PC_WRITING, &pc->flags);
615 return 0;
616 default:
617 return 1;
618 }
619}
620
621static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
622{
623 ide_hwif_t *hwif = drive->hwif;
624 struct scatterlist *sg, *scsi_sg;
625 int segments;
626
627 if (!pc->request_transfer || pc->request_transfer % 1024)
628 return 1;
629
630 if (idescsi_set_direction(pc))
631 return 1;
632
633 sg = hwif->sg_table;
634 scsi_sg = pc->scsi_cmd->request_buffer;
635 segments = pc->scsi_cmd->use_sg;
636
637 if (segments > hwif->sg_max_nents)
638 return 1;
639
640 if (!segments) {
641 hwif->sg_nents = 1;
642 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
643 } else {
644 hwif->sg_nents = segments;
645 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
646 }
647
648 return 0;
649}
650
651/*
652 * Issue a packet command
653 */
654static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
655{
656 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
657 ide_hwif_t *hwif = drive->hwif;
658 atapi_feature_t feature;
659 atapi_bcount_t bcount;
660
661 scsi->pc=pc; /* Set the current packet command */
662 pc->actually_transferred=0; /* We haven't transferred any data yet */
663 pc->current_position=pc->buffer;
664 bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
665
666 feature.all = 0;
667 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
668 hwif->sg_mapped = 1;
669 feature.b.dma = !hwif->dma_setup(drive);
670 hwif->sg_mapped = 0;
671 }
672
673 SELECT_DRIVE(drive);
674 if (IDE_CONTROL_REG)
675 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
676
677 HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
678 HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
679 HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
680
681 if (feature.b.dma)
682 set_bit(PC_DMA_OK, &pc->flags);
683
684 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
685 if (HWGROUP(drive)->handler != NULL)
686 BUG();
687 ide_set_handler(drive, &idescsi_transfer_pc,
688 get_timeout(pc), idescsi_expiry);
689 /* Issue the packet command */
690 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
691 return ide_started;
692 } else {
693 /* Issue the packet command */
694 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
695 return idescsi_transfer_pc(drive);
696 }
697}
698
699/*
700 * idescsi_do_request is our request handling function.
701 */
702static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
703{
704#if IDESCSI_DEBUG_LOG
705 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);
706 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
707#endif /* IDESCSI_DEBUG_LOG */
708
709 if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
710 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
711 }
712 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
713 idescsi_end_request (drive, 0, 0);
714 return ide_stopped;
715}
716
717static void idescsi_add_settings(ide_drive_t *drive)
718{
719 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
720
721/*
722 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
723 */
724 ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
725 ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
726 ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
727 ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
728 ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
729}
730
731/*
732 * Driver initialization.
733 */
734static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
735{
1da177e4
LT		 736 if (drive->id && (drive->id->config & 0x0060) == 0x20)
737 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
738 set_bit(IDESCSI_TRANSFORM, &scsi->transform);
739 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
740#if IDESCSI_DEBUG_LOG
741 set_bit(IDESCSI_LOG_CMD, &scsi->log);
742#endif /* IDESCSI_DEBUG_LOG */
743 idescsi_add_settings(drive);
1da177e4
LT		 744}
745
8604affd 746static int ide_scsi_remove(struct device *dev)
1da177e4 747{
8604affd 748 ide_drive_t *drive = to_ide_device(dev);
1da177e4
LT		 749 struct Scsi_Host *scsihost = drive->driver_data;
750 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
751 struct gendisk *g = scsi->disk;
752
8604affd 753 ide_unregister_subdriver(drive, scsi->driver);
1da177e4
LT		 754
755 ide_unregister_region(g);
756
757 drive->driver_data = NULL;
758 g->private_data = NULL;
759 put_disk(g);
760
761 scsi_remove_host(scsihost);
762 ide_scsi_put(scsi);
763
764 return 0;
765}
766
8604affd 767static int ide_scsi_probe(struct device *);
1da177e4
LT		 768
769#ifdef CONFIG_PROC_FS
770static ide_proc_entry_t idescsi_proc[] = {
771 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
772 { NULL, 0, NULL, NULL }
773};
774#else
775# define idescsi_proc NULL
776#endif
777
1da177e4
LT		 778static ide_driver_t idescsi_driver = {
779 .owner = THIS_MODULE,
8604affd
BZ		 780 .gen_driver = {
781 .name = "ide-scsi",
782 .bus = &ide_bus_type,
783 .probe = ide_scsi_probe,
784 .remove = ide_scsi_remove,
785 },
1da177e4
LT		 786 .version = IDESCSI_VERSION,
787 .media = ide_scsi,
1da177e4
LT		 788 .supports_dsc_overlap = 0,
789 .proc = idescsi_proc,
1da177e4
LT		 790 .do_request = idescsi_do_request,
791 .end_request = idescsi_end_request,
792 .error = idescsi_atapi_error,
793 .abort = idescsi_atapi_abort,
1da177e4
LT		 794};
795
796static int idescsi_ide_open(struct inode *inode, struct file *filp)
797{
798 struct gendisk *disk = inode->i_bdev->bd_disk;
799 struct ide_scsi_obj *scsi;
800 ide_drive_t *drive;
801
802 if (!(scsi = ide_scsi_get(disk)))
803 return -ENXIO;
804
805 drive = scsi->drive;
806
807 drive->usage++;
808
809 return 0;
810}
811
812static int idescsi_ide_release(struct inode *inode, struct file *filp)
813{
814 struct gendisk *disk = inode->i_bdev->bd_disk;
815 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
816 ide_drive_t *drive = scsi->drive;
817
818 drive->usage--;
819
820 ide_scsi_put(scsi);
821
822 return 0;
823}
824
825static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
826 unsigned int cmd, unsigned long arg)
827{
828 struct block_device *bdev = inode->i_bdev;
829 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
830 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
831}
832
833static struct block_device_operations idescsi_ops = {
834 .owner = THIS_MODULE,
835 .open = idescsi_ide_open,
836 .release = idescsi_ide_release,
837 .ioctl = idescsi_ide_ioctl,
838};
839
1da177e4
LT		 840static int idescsi_slave_configure(struct scsi_device * sdp)
841{
842 /* Configure detected device */
843 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
844 return 0;
845}
846
847static const char *idescsi_info (struct Scsi_Host *host)
848{
849 return "SCSI host adapter emulation for IDE ATAPI devices";
850}
851
852static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
853{
854 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
855
856 if (cmd == SG_SET_TRANSFORM) {
857 if (arg)
858 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
859 else
860 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
861 return 0;
862 } else if (cmd == SG_GET_TRANSFORM)
863 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
864 return -EINVAL;
865}
866
867static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
868{
869 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
870
871 /* this was a layering violation and we can't support it
872 anymore, sorry. */
873#if 0
874 struct gendisk *disk = cmd->request->rq_disk;
875
876 if (disk) {
877 struct Scsi_Device_Template **p = disk->private_data;
878 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
879 return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
880 }
881#endif
882 return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
883}
884
885static int idescsi_queue (struct scsi_cmnd *cmd,
886 void (*done)(struct scsi_cmnd *))
887{
888 struct Scsi_Host *host = cmd->device->host;
889 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
890 ide_drive_t *drive = scsi->drive;
891 struct request *rq = NULL;
892 idescsi_pc_t *pc = NULL;
893
894 if (!drive) {
895 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
896 goto abort;
897 }
898 scsi = drive_to_idescsi(drive);
899 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
900 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
901 if (rq == NULL || pc == NULL) {
902 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
903 goto abort;
904 }
905
906 memset (pc->c, 0, 12);
907 pc->flags = 0;
908 pc->rq = rq;
909 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
910 if (cmd->use_sg) {
911 pc->buffer = NULL;
912 pc->sg = cmd->request_buffer;
913 } else {
914 pc->buffer = cmd->request_buffer;
915 pc->sg = NULL;
916 }
917 pc->b_count = 0;
918 pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
919 pc->scsi_cmd = cmd;
920 pc->done = done;
921 pc->timeout = jiffies + cmd->timeout_per_command;
922
923 if (should_transform(drive, cmd))
924 set_bit(PC_TRANSFORM, &pc->flags);
925 idescsi_transform_pc1 (drive, pc);
926
927 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
928 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
929 hexdump(cmd->cmnd, cmd->cmd_len);
930 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
931 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
932 hexdump(pc->c, 12);
933 }
934 }
935
936 ide_init_drive_cmd (rq);
937 rq->special = (char *) pc;
938 rq->flags = REQ_SPECIAL;
939 spin_unlock_irq(host->host_lock);
940 rq->rq_disk = scsi->disk;
941 (void) ide_do_drive_cmd (drive, rq, ide_end);
942 spin_lock_irq(host->host_lock);
943 return 0;
944abort:
945 if (pc) kfree (pc);
946 if (rq) kfree (rq);
947 cmd->result = DID_ERROR << 16;
948 done(cmd);
949 return 0;
950}
951
952static int idescsi_eh_abort (struct scsi_cmnd *cmd)
953{
954 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
955 ide_drive_t *drive = scsi->drive;
956 int busy;
957 int ret = FAILED;
958
959 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
960
961 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
962 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
963
964 if (!drive) {
965 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
966 WARN_ON(1);
967 goto no_drive;
968 }
969
970 /* First give it some more time, how much is "right" is hard to say :-( */
971
972 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
973 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
974 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
975
976 spin_lock_irq(&ide_lock);
977
978 /* If there is no pc running we're done (our interrupt took care of it) */
979 if (!scsi->pc) {
980 ret = SUCCESS;
981 goto ide_unlock;
982 }
983
984 /* It's somewhere in flight. Does ide subsystem agree? */
985 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
986 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
987 /*
988 * FIXME - not sure this condition can ever occur
989 */
990 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
991
992 if (scsi->pc->rq->flags & REQ_SENSE)
993 kfree(scsi->pc->buffer);
994 kfree(scsi->pc->rq);
995 kfree(scsi->pc);
996 scsi->pc = NULL;
997
998 ret = SUCCESS;
999 }
1000
1001ide_unlock:
1002 spin_unlock_irq(&ide_lock);
1003no_drive:
1004 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1005 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1006
1007 return ret;
1008}
1009
1010static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1011{
1012 struct request *req;
1013 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
1014 ide_drive_t *drive = scsi->drive;
1015 int ready = 0;
1016 int ret = SUCCESS;
1017
1018 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1019
1020 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1021 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1022
1023 if (!drive) {
1024 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1025 WARN_ON(1);
1026 return FAILED;
1027 }
1028
1029 spin_lock_irq(&ide_lock);
1030
1031 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1032 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1033 spin_unlock(&ide_lock);
1034 return FAILED;
1035 }
1036
1037 /* kill current request */
1038 blkdev_dequeue_request(req);
1039 end_that_request_last(req);
1040 if (req->flags & REQ_SENSE)
1041 kfree(scsi->pc->buffer);
1042 kfree(scsi->pc);
1043 scsi->pc = NULL;
1044 kfree(req);
1045
1046 /* now nuke the drive queue */
1047 while ((req = elv_next_request(drive->queue))) {
1048 blkdev_dequeue_request(req);
1049 end_that_request_last(req);
1050 }
1051
1052 HWGROUP(drive)->rq = NULL;
1053 HWGROUP(drive)->handler = NULL;
1054 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
1055 spin_unlock_irq(&ide_lock);
1056
1057 ide_do_reset(drive);
1058
1059 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1060
1061 do {
1062 set_current_state(TASK_UNINTERRUPTIBLE);
1063 spin_unlock_irq(cmd->device->host->host_lock);
1064 schedule_timeout(HZ/20);
1065 spin_lock_irq(cmd->device->host->host_lock);
1066 } while ( HWGROUP(drive)->handler );
1067
1068 ready = drive_is_ready(drive);
1069 HWGROUP(drive)->busy--;
1070 if (!ready) {
1071 printk (KERN_ERR "ide-scsi: reset failed!\n");
1072 ret = FAILED;
1073 }
1074
1075 return ret;
1076}
1077
1078static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1079 sector_t capacity, int *parm)
1080{
1081 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1082 ide_drive_t *drive = idescsi->drive;
1083
1084 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1085 parm[0] = drive->bios_head;
1086 parm[1] = drive->bios_sect;
1087 parm[2] = drive->bios_cyl;
1088 }
1089 return 0;
1090}
1091
1092static struct scsi_host_template idescsi_template = {
1093 .module = THIS_MODULE,
1094 .name = "idescsi",
1095 .info = idescsi_info,
1096 .slave_configure = idescsi_slave_configure,
1097 .ioctl = idescsi_ioctl,
1098 .queuecommand = idescsi_queue,
1099 .eh_abort_handler = idescsi_eh_abort,
1100 .eh_host_reset_handler = idescsi_eh_reset,
1101 .bios_param = idescsi_bios,
1102 .can_queue = 40,
1103 .this_id = -1,
1104 .sg_tablesize = 256,
1105 .cmd_per_lun = 5,
1106 .max_sectors = 128,
1107 .use_clustering = DISABLE_CLUSTERING,
1108 .emulated = 1,
1109 .proc_name = "ide-scsi",
1110};
1111
8604affd 1112static int ide_scsi_probe(struct device *dev)
1da177e4 1113{
8604affd 1114 ide_drive_t *drive = to_ide_device(dev);
1da177e4
LT		 1115 idescsi_scsi_t *idescsi;
1116 struct Scsi_Host *host;
1117 struct gendisk *g;
1118 static int warned;
1119 int err = -ENOMEM;
1120
1121 if (!warned && drive->media == ide_cdrom) {
1122 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1123 warned = 1;
1124 }
1125
1126 if (!strstr("ide-scsi", drive->driver_req) ||
1127 !drive->present ||
1128 drive->media == ide_disk ||
1129 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
8604affd 1130 return -ENODEV;
1da177e4
LT		 1131
1132 g = alloc_disk(1 << PARTN_BITS);
1133 if (!g)
1134 goto out_host_put;
1135
1136 ide_init_disk(g, drive);
1137
1138 host->max_id = 1;
1139
1140#if IDESCSI_DEBUG_LOG
1141 if (drive->id->last_lun)
1142 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1143#endif
1144 if ((drive->id->last_lun & 0x7) != 7)
1145 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1146 else
1147 host->max_lun = 1;
1148
1149 drive->driver_data = host;
1150 idescsi = scsihost_to_idescsi(host);
1151 idescsi->drive = drive;
1152 idescsi->driver = &idescsi_driver;
1153 idescsi->host = host;
1154 idescsi->disk = g;
1155 g->private_data = &idescsi->driver;
8604affd
BZ		 1156 ide_register_subdriver(drive, &idescsi_driver);
1157 err = 0;
1158 idescsi_setup(drive, idescsi);
1159 g->fops = &idescsi_ops;
1160 ide_register_region(g);
1161 err = scsi_add_host(host, &drive->gendev);
1da177e4 1162 if (!err) {
8604affd
BZ		 1163 scsi_scan_host(host);
1164 return 0;
1da177e4 1165 }
8604affd
BZ		 1166 /* fall through on error */
1167 ide_unregister_region(g);
1168 ide_unregister_subdriver(drive, &idescsi_driver);
1da177e4
LT		 1169
1170 put_disk(g);
1171out_host_put:
1172 scsi_host_put(host);
1173 return err;
1174}
1175
1176static int __init init_idescsi_module(void)
1177{
8604affd 1178 return driver_register(&idescsi_driver.gen_driver);
1da177e4
LT		 1179}
1180
1181static void __exit exit_idescsi_module(void)
1182{
8604affd 1183 driver_unregister(&idescsi_driver.gen_driver);
1da177e4
LT		 1184}
1185
1186module_init(init_idescsi_module);
1187module_exit(exit_idescsi_module);
1188MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)