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[PATCH] ide: ide-scsi fails to call idescsi_check_condition for things like "Medium...
[linux-2.6/mini2440.git] / drivers / scsi / ide-scsi.c
blob3553da0e1cd5c213fac3466b2e08a51399c5feed
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 #include <linux/delay.h>
50
51 #include <asm/io.h>
52 #include <asm/bitops.h>
53 #include <asm/uaccess.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_tcq.h>
60 #include <scsi/sg.h>
61
62 #define IDESCSI_DEBUG_LOG 0
63
64 typedef struct idescsi_pc_s {
65 u8 c[12]; /* Actual packet bytes */
66 int request_transfer; /* Bytes to transfer */
67 int actually_transferred; /* Bytes actually transferred */
68 int buffer_size; /* Size of our data buffer */
69 struct request *rq; /* The corresponding request */
70 u8 *buffer; /* Data buffer */
71 u8 *current_position; /* Pointer into the above buffer */
72 struct scatterlist *sg; /* Scatter gather table */
73 int b_count; /* Bytes transferred from current entry */
74 struct scsi_cmnd *scsi_cmd; /* SCSI command */
75 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
76 unsigned long flags; /* Status/Action flags */
77 unsigned long timeout; /* Command timeout */
78 } idescsi_pc_t;
79
80 /*
81 * Packet command status bits.
82 */
83 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
84 #define PC_WRITING 1 /* Data direction */
85 #define PC_TRANSFORM 2 /* transform SCSI commands */
86 #define PC_TIMEDOUT 3 /* command timed out */
87 #define PC_DMA_OK 4 /* Use DMA */
88
89 /*
90 * SCSI command transformation layer
91 */
92 #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */
93 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
94
95 /*
96 * Log flags
97 */
98 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
99
100 typedef struct ide_scsi_obj {
101 ide_drive_t *drive;
102 ide_driver_t *driver;
103 struct gendisk *disk;
104 struct Scsi_Host *host;
105
106 idescsi_pc_t *pc; /* Current packet command */
107 unsigned long flags; /* Status/Action flags */
108 unsigned long transform; /* SCSI cmd translation layer */
109 unsigned long log; /* log flags */
110 } idescsi_scsi_t;
111
112 static DECLARE_MUTEX(idescsi_ref_sem);
113
114 #define ide_scsi_g(disk) \
115 container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118 {
119 struct ide_scsi_obj *scsi = NULL;
120
121 down(&idescsi_ref_sem);
122 scsi = ide_scsi_g(disk);
123 if (scsi)
124 scsi_host_get(scsi->host);
125 up(&idescsi_ref_sem);
126 return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131 down(&idescsi_ref_sem);
132 scsi_host_put(scsi->host);
133 up(&idescsi_ref_sem);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138 return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143 return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147 * Per ATAPI device status bits.
148 */
149 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
150
151 /*
152 * ide-scsi requests.
153 */
154 #define IDESCSI_PC_RQ 90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158 while (bcount--)
159 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164 while (bcount--)
165 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169 * PIO data transfer routines using the scatter gather table.
170 */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173 int count;
174 char *buf;
175
176 while (bcount) {
177 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
178 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
179 idescsi_discard_data (drive, bcount);
180 return;
181 }
182 count = min(pc->sg->length - pc->b_count, bcount);
183 if (PageHighMem(pc->sg->page)) {
184 unsigned long flags;
185
186 local_irq_save(flags);
187 buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
188 pc->sg->offset;
189 drive->hwif->atapi_input_bytes(drive,
190 buf + pc->b_count, count);
191 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
192 local_irq_restore(flags);
193 } else {
194 buf = page_address(pc->sg->page) + pc->sg->offset;
195 drive->hwif->atapi_input_bytes(drive,
196 buf + pc->b_count, count);
197 }
198 bcount -= count; pc->b_count += count;
199 if (pc->b_count == pc->sg->length) {
200 pc->sg++;
201 pc->b_count = 0;
202 }
203 }
204 }
205
206 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
207 {
208 int count;
209 char *buf;
210
211 while (bcount) {
212 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
213 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
214 idescsi_output_zeros (drive, bcount);
215 return;
216 }
217 count = min(pc->sg->length - pc->b_count, bcount);
218 if (PageHighMem(pc->sg->page)) {
219 unsigned long flags;
220
221 local_irq_save(flags);
222 buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
223 pc->sg->offset;
224 drive->hwif->atapi_output_bytes(drive,
225 buf + pc->b_count, count);
226 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
227 local_irq_restore(flags);
228 } else {
229 buf = page_address(pc->sg->page) + pc->sg->offset;
230 drive->hwif->atapi_output_bytes(drive,
231 buf + pc->b_count, count);
232 }
233 bcount -= count; pc->b_count += count;
234 if (pc->b_count == pc->sg->length) {
235 pc->sg++;
236 pc->b_count = 0;
237 }
238 }
239 }
240
241 /*
242 * Most of the SCSI commands are supported directly by ATAPI devices.
243 * idescsi_transform_pc handles the few exceptions.
244 */
245 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
246 {
247 u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
248 char *atapi_buf;
249
250 if (!test_bit(PC_TRANSFORM, &pc->flags))
251 return;
252 if (drive->media == ide_cdrom || drive->media == ide_optical) {
253 if (c[0] == READ_6 || c[0] == WRITE_6) {
254 c[8] = c[4]; c[5] = c[3]; c[4] = c[2];
255 c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0;
256 c[0] += (READ_10 - READ_6);
257 }
258 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
259 unsigned short new_len;
260 if (!scsi_buf)
261 return;
262 if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
263 return;
264 memset(atapi_buf, 0, pc->buffer_size + 4);
265 memset (c, 0, 12);
266 c[0] = sc[0] | 0x40;
267 c[1] = sc[1];
268 c[2] = sc[2];
269 new_len = sc[4] + 4;
270 c[8] = new_len;
271 c[7] = new_len >> 8;
272 c[9] = sc[5];
273 if (c[0] == MODE_SELECT_10) {
274 atapi_buf[1] = scsi_buf[0]; /* Mode data length */
275 atapi_buf[2] = scsi_buf[1]; /* Medium type */
276 atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */
277 atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */
278 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
279 }
280 pc->buffer = atapi_buf;
281 pc->request_transfer += 4;
282 pc->buffer_size += 4;
283 }
284 }
285 }
286
287 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
288 {
289 u8 *atapi_buf = pc->buffer;
290 u8 *sc = pc->scsi_cmd->cmnd;
291 u8 *scsi_buf = pc->scsi_cmd->request_buffer;
292
293 if (!test_bit(PC_TRANSFORM, &pc->flags))
294 return;
295 if (drive->media == ide_cdrom || drive->media == ide_optical) {
296 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
297 scsi_buf[0] = atapi_buf[1]; /* Mode data length */
298 scsi_buf[1] = atapi_buf[2]; /* Medium type */
299 scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */
300 scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */
301 memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
302 }
303 if (pc->c[0] == INQUIRY) {
304 scsi_buf[2] |= 2; /* ansi_revision */
305 scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
306 }
307 }
308 if (atapi_buf && atapi_buf != scsi_buf)
309 kfree(atapi_buf);
310 }
311
312 static void hexdump(u8 *x, int len)
313 {
314 int i;
315
316 printk("[ ");
317 for (i = 0; i < len; i++)
318 printk("%x ", x[i]);
319 printk("]\n");
320 }
321
322 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
323 {
324 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
325 idescsi_pc_t *pc;
326 struct request *rq;
327 u8 *buf;
328
329 /* stuff a sense request in front of our current request */
330 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
331 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
332 buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
333 if (pc == NULL || rq == NULL || buf == NULL) {
334 kfree(buf);
335 kfree(rq);
336 kfree(pc);
337 return -ENOMEM;
338 }
339 memset (pc, 0, sizeof (idescsi_pc_t));
340 memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
341 ide_init_drive_cmd(rq);
342 rq->special = (char *) pc;
343 pc->rq = rq;
344 pc->buffer = buf;
345 pc->c[0] = REQUEST_SENSE;
346 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
347 rq->flags = REQ_SENSE;
348 pc->timeout = jiffies + WAIT_READY;
349 /* NOTE! Save the failed packet command in "rq->buffer" */
350 rq->buffer = (void *) failed_command->special;
351 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
352 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
353 printk ("ide-scsi: %s: queue cmd = ", drive->name);
354 hexdump(pc->c, 6);
355 }
356 rq->rq_disk = scsi->disk;
357 return ide_do_drive_cmd(drive, rq, ide_preempt);
358 }
359
360 static int idescsi_end_request(ide_drive_t *, int, int);
361
362 static ide_startstop_t
363 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
364 {
365 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
366 /* force an abort */
367 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
368
369 rq->errors++;
370
371 idescsi_end_request(drive, 0, 0);
372
373 return ide_stopped;
374 }
375
376 static ide_startstop_t
377 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
378 {
379 #if IDESCSI_DEBUG_LOG
380 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
381 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
382 #endif
383 rq->errors |= ERROR_MAX;
384
385 idescsi_end_request(drive, 0, 0);
386
387 return ide_stopped;
388 }
389
390 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
391 {
392 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
393 struct request *rq = HWGROUP(drive)->rq;
394 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
395 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
396 struct Scsi_Host *host;
397 u8 *scsi_buf;
398 int errors = rq->errors;
399 unsigned long flags;
400
401 if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
402 ide_end_request(drive, uptodate, nrsecs);
403 return 0;
404 }
405 ide_end_drive_cmd (drive, 0, 0);
406 if (rq->flags & REQ_SENSE) {
407 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
408 if (log) {
409 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
410 hexdump(pc->buffer,16);
411 }
412 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
413 kfree(pc->buffer);
414 kfree(pc);
415 kfree(rq);
416 pc = opc;
417 rq = pc->rq;
418 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
419 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
420 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
421 if (log)
422 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
423 drive->name, pc->scsi_cmd->serial_number);
424 pc->scsi_cmd->result = DID_TIME_OUT << 16;
425 } else if (errors >= ERROR_MAX) {
426 pc->scsi_cmd->result = DID_ERROR << 16;
427 if (log)
428 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
429 } else if (errors) {
430 if (log)
431 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
432 if (!idescsi_check_condition(drive, rq))
433 /* we started a request sense, so we'll be back, exit for now */
434 return 0;
435 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
436 } else {
437 pc->scsi_cmd->result = DID_OK << 16;
438 idescsi_transform_pc2 (drive, pc);
439 if (log) {
440 printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
441 if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
442 printk(", rst = ");
443 scsi_buf = pc->scsi_cmd->request_buffer;
444 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
445 } else printk("\n");
446 }
447 }
448 host = pc->scsi_cmd->device->host;
449 spin_lock_irqsave(host->host_lock, flags);
450 pc->done(pc->scsi_cmd);
451 spin_unlock_irqrestore(host->host_lock, flags);
452 kfree(pc);
453 kfree(rq);
454 scsi->pc = NULL;
455 return 0;
456 }
457
458 static inline unsigned long get_timeout(idescsi_pc_t *pc)
459 {
460 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
461 }
462
463 static int idescsi_expiry(ide_drive_t *drive)
464 {
465 idescsi_scsi_t *scsi = drive->driver_data;
466 idescsi_pc_t *pc = scsi->pc;
467
468 #if IDESCSI_DEBUG_LOG
469 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
470 #endif
471 set_bit(PC_TIMEDOUT, &pc->flags);
472
473 return 0; /* we do not want the ide subsystem to retry */
474 }
475
476 /*
477 * Our interrupt handler.
478 */
479 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
480 {
481 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
482 idescsi_pc_t *pc=scsi->pc;
483 struct request *rq = pc->rq;
484 atapi_bcount_t bcount;
485 atapi_status_t status;
486 atapi_ireason_t ireason;
487 atapi_feature_t feature;
488
489 unsigned int temp;
490
491 #if IDESCSI_DEBUG_LOG
492 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
493 #endif /* IDESCSI_DEBUG_LOG */
494
495 if (test_bit(PC_TIMEDOUT, &pc->flags)){
496 #if IDESCSI_DEBUG_LOG
497 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
498 pc->scsi_cmd->serial_number, jiffies);
499 #endif
500 /* end this request now - scsi should retry it*/
501 idescsi_end_request (drive, 1, 0);
502 return ide_stopped;
503 }
504 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
505 #if IDESCSI_DEBUG_LOG
506 printk ("ide-scsi: %s: DMA complete\n", drive->name);
507 #endif /* IDESCSI_DEBUG_LOG */
508 pc->actually_transferred=pc->request_transfer;
509 (void) HWIF(drive)->ide_dma_end(drive);
510 }
511
512 feature.all = 0;
513 /* Clear the interrupt */
514 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
515
516 if (!status.b.drq) {
517 /* No more interrupts */
518 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
519 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
520 local_irq_enable();
521 if (status.b.check)
522 rq->errors++;
523 idescsi_end_request (drive, 1, 0);
524 return ide_stopped;
525 }
526 bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
527 bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
528 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
529
530 if (ireason.b.cod) {
531 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
532 return ide_do_reset (drive);
533 }
534 if (ireason.b.io) {
535 temp = pc->actually_transferred + bcount.all;
536 if (temp > pc->request_transfer) {
537 if (temp > pc->buffer_size) {
538 printk(KERN_ERR "ide-scsi: The scsi wants to "
539 "send us more data than expected "
540 "- discarding data\n");
541 temp = pc->buffer_size - pc->actually_transferred;
542 if (temp) {
543 clear_bit(PC_WRITING, &pc->flags);
544 if (pc->sg)
545 idescsi_input_buffers(drive, pc, temp);
546 else
547 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
548 printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
549 }
550 pc->actually_transferred += temp;
551 pc->current_position += temp;
552 idescsi_discard_data(drive, bcount.all - temp);
553 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
554 return ide_started;
555 }
556 #if IDESCSI_DEBUG_LOG
557 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
558 #endif /* IDESCSI_DEBUG_LOG */
559 }
560 }
561 if (ireason.b.io) {
562 clear_bit(PC_WRITING, &pc->flags);
563 if (pc->sg)
564 idescsi_input_buffers(drive, pc, bcount.all);
565 else
566 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
567 } else {
568 set_bit(PC_WRITING, &pc->flags);
569 if (pc->sg)
570 idescsi_output_buffers (drive, pc, bcount.all);
571 else
572 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
573 }
574 /* Update the current position */
575 pc->actually_transferred += bcount.all;
576 pc->current_position += bcount.all;
577
578 /* And set the interrupt handler again */
579 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
580 return ide_started;
581 }
582
583 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
584 {
585 ide_hwif_t *hwif = drive->hwif;
586 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
587 idescsi_pc_t *pc = scsi->pc;
588 atapi_ireason_t ireason;
589 ide_startstop_t startstop;
590
591 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
592 printk(KERN_ERR "ide-scsi: Strange, packet command "
593 "initiated yet DRQ isn't asserted\n");
594 return startstop;
595 }
596 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
597 if (!ireason.b.cod || ireason.b.io) {
598 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
599 "issuing a packet command\n");
600 return ide_do_reset (drive);
601 }
602 if (HWGROUP(drive)->handler != NULL)
603 BUG();
604 /* Set the interrupt routine */
605 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
606 /* Send the actual packet */
607 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
608 if (test_bit (PC_DMA_OK, &pc->flags)) {
609 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
610 hwif->dma_start(drive);
611 }
612 return ide_started;
613 }
614
615 static inline int idescsi_set_direction(idescsi_pc_t *pc)
616 {
617 switch (pc->c[0]) {
618 case READ_6: case READ_10: case READ_12:
619 clear_bit(PC_WRITING, &pc->flags);
620 return 0;
621 case WRITE_6: case WRITE_10: case WRITE_12:
622 set_bit(PC_WRITING, &pc->flags);
623 return 0;
624 default:
625 return 1;
626 }
627 }
628
629 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
630 {
631 ide_hwif_t *hwif = drive->hwif;
632 struct scatterlist *sg, *scsi_sg;
633 int segments;
634
635 if (!pc->request_transfer || pc->request_transfer % 1024)
636 return 1;
637
638 if (idescsi_set_direction(pc))
639 return 1;
640
641 sg = hwif->sg_table;
642 scsi_sg = pc->scsi_cmd->request_buffer;
643 segments = pc->scsi_cmd->use_sg;
644
645 if (segments > hwif->sg_max_nents)
646 return 1;
647
648 if (!segments) {
649 hwif->sg_nents = 1;
650 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
651 } else {
652 hwif->sg_nents = segments;
653 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
654 }
655
656 return 0;
657 }
658
659 /*
660 * Issue a packet command
661 */
662 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
663 {
664 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
665 ide_hwif_t *hwif = drive->hwif;
666 atapi_feature_t feature;
667 atapi_bcount_t bcount;
668
669 scsi->pc=pc; /* Set the current packet command */
670 pc->actually_transferred=0; /* We haven't transferred any data yet */
671 pc->current_position=pc->buffer;
672 bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
673
674 feature.all = 0;
675 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
676 hwif->sg_mapped = 1;
677 feature.b.dma = !hwif->dma_setup(drive);
678 hwif->sg_mapped = 0;
679 }
680
681 SELECT_DRIVE(drive);
682 if (IDE_CONTROL_REG)
683 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
684
685 HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
686 HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
687 HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
688
689 if (feature.b.dma)
690 set_bit(PC_DMA_OK, &pc->flags);
691
692 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
693 if (HWGROUP(drive)->handler != NULL)
694 BUG();
695 ide_set_handler(drive, &idescsi_transfer_pc,
696 get_timeout(pc), idescsi_expiry);
697 /* Issue the packet command */
698 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
699 return ide_started;
700 } else {
701 /* Issue the packet command */
702 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
703 return idescsi_transfer_pc(drive);
704 }
705 }
706
707 /*
708 * idescsi_do_request is our request handling function.
709 */
710 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
711 {
712 #if IDESCSI_DEBUG_LOG
713 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);
714 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
715 #endif /* IDESCSI_DEBUG_LOG */
716
717 if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
718 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
719 }
720 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
721 idescsi_end_request (drive, 0, 0);
722 return ide_stopped;
723 }
724
725 static void idescsi_add_settings(ide_drive_t *drive)
726 {
727 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
728
729 /*
730 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
731 */
732 ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
733 ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
734 ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
735 ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
736 ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
737 }
738
739 /*
740 * Driver initialization.
741 */
742 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
743 {
744 if (drive->id && (drive->id->config & 0x0060) == 0x20)
745 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
746 set_bit(IDESCSI_TRANSFORM, &scsi->transform);
747 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
748 #if IDESCSI_DEBUG_LOG
749 set_bit(IDESCSI_LOG_CMD, &scsi->log);
750 #endif /* IDESCSI_DEBUG_LOG */
751 idescsi_add_settings(drive);
752 }
753
754 static int ide_scsi_remove(struct device *dev)
755 {
756 ide_drive_t *drive = to_ide_device(dev);
757 struct Scsi_Host *scsihost = drive->driver_data;
758 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
759 struct gendisk *g = scsi->disk;
760
761 ide_unregister_subdriver(drive, scsi->driver);
762
763 ide_unregister_region(g);
764
765 drive->driver_data = NULL;
766 g->private_data = NULL;
767 put_disk(g);
768
769 scsi_remove_host(scsihost);
770 ide_scsi_put(scsi);
771
772 return 0;
773 }
774
775 static int ide_scsi_probe(struct device *);
776
777 #ifdef CONFIG_PROC_FS
778 static ide_proc_entry_t idescsi_proc[] = {
779 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
780 { NULL, 0, NULL, NULL }
781 };
782 #else
783 # define idescsi_proc NULL
784 #endif
785
786 static ide_driver_t idescsi_driver = {
787 .owner = THIS_MODULE,
788 .gen_driver = {
789 .name = "ide-scsi",
790 .bus = &ide_bus_type,
791 .probe = ide_scsi_probe,
792 .remove = ide_scsi_remove,
793 },
794 .version = IDESCSI_VERSION,
795 .media = ide_scsi,
796 .supports_dsc_overlap = 0,
797 .proc = idescsi_proc,
798 .do_request = idescsi_do_request,
799 .end_request = idescsi_end_request,
800 .error = idescsi_atapi_error,
801 .abort = idescsi_atapi_abort,
802 };
803
804 static int idescsi_ide_open(struct inode *inode, struct file *filp)
805 {
806 struct gendisk *disk = inode->i_bdev->bd_disk;
807 struct ide_scsi_obj *scsi;
808 ide_drive_t *drive;
809
810 if (!(scsi = ide_scsi_get(disk)))
811 return -ENXIO;
812
813 drive = scsi->drive;
814
815 drive->usage++;
816
817 return 0;
818 }
819
820 static int idescsi_ide_release(struct inode *inode, struct file *filp)
821 {
822 struct gendisk *disk = inode->i_bdev->bd_disk;
823 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
824 ide_drive_t *drive = scsi->drive;
825
826 drive->usage--;
827
828 ide_scsi_put(scsi);
829
830 return 0;
831 }
832
833 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
834 unsigned int cmd, unsigned long arg)
835 {
836 struct block_device *bdev = inode->i_bdev;
837 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
838 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
839 }
840
841 static struct block_device_operations idescsi_ops = {
842 .owner = THIS_MODULE,
843 .open = idescsi_ide_open,
844 .release = idescsi_ide_release,
845 .ioctl = idescsi_ide_ioctl,
846 };
847
848 static int idescsi_slave_configure(struct scsi_device * sdp)
849 {
850 /* Configure detected device */
851 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
852 return 0;
853 }
854
855 static const char *idescsi_info (struct Scsi_Host *host)
856 {
857 return "SCSI host adapter emulation for IDE ATAPI devices";
858 }
859
860 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
861 {
862 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
863
864 if (cmd == SG_SET_TRANSFORM) {
865 if (arg)
866 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
867 else
868 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
869 return 0;
870 } else if (cmd == SG_GET_TRANSFORM)
871 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
872 return -EINVAL;
873 }
874
875 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
876 {
877 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
878
879 /* this was a layering violation and we can't support it
880 anymore, sorry. */
881 #if 0
882 struct gendisk *disk = cmd->request->rq_disk;
883
884 if (disk) {
885 struct Scsi_Device_Template **p = disk->private_data;
886 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
887 return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
888 }
889 #endif
890 return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
891 }
892
893 static int idescsi_queue (struct scsi_cmnd *cmd,
894 void (*done)(struct scsi_cmnd *))
895 {
896 struct Scsi_Host *host = cmd->device->host;
897 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
898 ide_drive_t *drive = scsi->drive;
899 struct request *rq = NULL;
900 idescsi_pc_t *pc = NULL;
901
902 if (!drive) {
903 scmd_printk (KERN_ERR, cmd, "drive not present\n");
904 goto abort;
905 }
906 scsi = drive_to_idescsi(drive);
907 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
908 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
909 if (rq == NULL || pc == NULL) {
910 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
911 goto abort;
912 }
913
914 memset (pc->c, 0, 12);
915 pc->flags = 0;
916 pc->rq = rq;
917 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
918 if (cmd->use_sg) {
919 pc->buffer = NULL;
920 pc->sg = cmd->request_buffer;
921 } else {
922 pc->buffer = cmd->request_buffer;
923 pc->sg = NULL;
924 }
925 pc->b_count = 0;
926 pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
927 pc->scsi_cmd = cmd;
928 pc->done = done;
929 pc->timeout = jiffies + cmd->timeout_per_command;
930
931 if (should_transform(drive, cmd))
932 set_bit(PC_TRANSFORM, &pc->flags);
933 idescsi_transform_pc1 (drive, pc);
934
935 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
936 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
937 hexdump(cmd->cmnd, cmd->cmd_len);
938 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
939 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
940 hexdump(pc->c, 12);
941 }
942 }
943
944 ide_init_drive_cmd (rq);
945 rq->special = (char *) pc;
946 rq->flags = REQ_SPECIAL;
947 spin_unlock_irq(host->host_lock);
948 rq->rq_disk = scsi->disk;
949 (void) ide_do_drive_cmd (drive, rq, ide_end);
950 spin_lock_irq(host->host_lock);
951 return 0;
952 abort:
953 kfree (pc);
954 kfree (rq);
955 cmd->result = DID_ERROR << 16;
956 done(cmd);
957 return 0;
958 }
959
960 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
961 {
962 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
963 ide_drive_t *drive = scsi->drive;
964 int busy;
965 int ret = FAILED;
966
967 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
968
969 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
970 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
971
972 if (!drive) {
973 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
974 WARN_ON(1);
975 goto no_drive;
976 }
977
978 /* First give it some more time, how much is "right" is hard to say :-( */
979
980 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
981 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
982 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
983
984 spin_lock_irq(&ide_lock);
985
986 /* If there is no pc running we're done (our interrupt took care of it) */
987 if (!scsi->pc) {
988 ret = SUCCESS;
989 goto ide_unlock;
990 }
991
992 /* It's somewhere in flight. Does ide subsystem agree? */
993 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
994 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
995 /*
996 * FIXME - not sure this condition can ever occur
997 */
998 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
999
1000 if (scsi->pc->rq->flags & REQ_SENSE)
1001 kfree(scsi->pc->buffer);
1002 kfree(scsi->pc->rq);
1003 kfree(scsi->pc);
1004 scsi->pc = NULL;
1005
1006 ret = SUCCESS;
1007 }
1008
1009 ide_unlock:
1010 spin_unlock_irq(&ide_lock);
1011 no_drive:
1012 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1013 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1014
1015 return ret;
1016 }
1017
1018 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1019 {
1020 struct request *req;
1021 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
1022 ide_drive_t *drive = scsi->drive;
1023 int ready = 0;
1024 int ret = SUCCESS;
1025
1026 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1027
1028 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1029 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1030
1031 if (!drive) {
1032 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1033 WARN_ON(1);
1034 return FAILED;
1035 }
1036
1037 spin_lock_irq(cmd->device->host->host_lock);
1038 spin_lock(&ide_lock);
1039
1040 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1041 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1042 spin_unlock(&ide_lock);
1043 spin_unlock_irq(cmd->device->host->host_lock);
1044 return FAILED;
1045 }
1046
1047 /* kill current request */
1048 blkdev_dequeue_request(req);
1049 end_that_request_last(req);
1050 if (req->flags & REQ_SENSE)
1051 kfree(scsi->pc->buffer);
1052 kfree(scsi->pc);
1053 scsi->pc = NULL;
1054 kfree(req);
1055
1056 /* now nuke the drive queue */
1057 while ((req = elv_next_request(drive->queue))) {
1058 blkdev_dequeue_request(req);
1059 end_that_request_last(req);
1060 }
1061
1062 HWGROUP(drive)->rq = NULL;
1063 HWGROUP(drive)->handler = NULL;
1064 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
1065 spin_unlock(&ide_lock);
1066
1067 ide_do_reset(drive);
1068
1069 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1070
1071 do {
1072 spin_unlock_irq(cmd->device->host->host_lock);
1073 msleep(50);
1074 spin_lock_irq(cmd->device->host->host_lock);
1075 } while ( HWGROUP(drive)->handler );
1076
1077 ready = drive_is_ready(drive);
1078 HWGROUP(drive)->busy--;
1079 if (!ready) {
1080 printk (KERN_ERR "ide-scsi: reset failed!\n");
1081 ret = FAILED;
1082 }
1083
1084 spin_unlock_irq(cmd->device->host->host_lock);
1085 return ret;
1086 }
1087
1088 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1089 sector_t capacity, int *parm)
1090 {
1091 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1092 ide_drive_t *drive = idescsi->drive;
1093
1094 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1095 parm[0] = drive->bios_head;
1096 parm[1] = drive->bios_sect;
1097 parm[2] = drive->bios_cyl;
1098 }
1099 return 0;
1100 }
1101
1102 static struct scsi_host_template idescsi_template = {
1103 .module = THIS_MODULE,
1104 .name = "idescsi",
1105 .info = idescsi_info,
1106 .slave_configure = idescsi_slave_configure,
1107 .ioctl = idescsi_ioctl,
1108 .queuecommand = idescsi_queue,
1109 .eh_abort_handler = idescsi_eh_abort,
1110 .eh_host_reset_handler = idescsi_eh_reset,
1111 .bios_param = idescsi_bios,
1112 .can_queue = 40,
1113 .this_id = -1,
1114 .sg_tablesize = 256,
1115 .cmd_per_lun = 5,
1116 .max_sectors = 128,
1117 .use_clustering = DISABLE_CLUSTERING,
1118 .emulated = 1,
1119 .proc_name = "ide-scsi",
1120 };
1121
1122 static int ide_scsi_probe(struct device *dev)
1123 {
1124 ide_drive_t *drive = to_ide_device(dev);
1125 idescsi_scsi_t *idescsi;
1126 struct Scsi_Host *host;
1127 struct gendisk *g;
1128 static int warned;
1129 int err = -ENOMEM;
1130
1131 if (!warned && drive->media == ide_cdrom) {
1132 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1133 warned = 1;
1134 }
1135
1136 if (!strstr("ide-scsi", drive->driver_req) ||
1137 !drive->present ||
1138 drive->media == ide_disk ||
1139 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1140 return -ENODEV;
1141
1142 g = alloc_disk(1 << PARTN_BITS);
1143 if (!g)
1144 goto out_host_put;
1145
1146 ide_init_disk(g, drive);
1147
1148 host->max_id = 1;
1149
1150 #if IDESCSI_DEBUG_LOG
1151 if (drive->id->last_lun)
1152 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1153 #endif
1154 if ((drive->id->last_lun & 0x7) != 7)
1155 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1156 else
1157 host->max_lun = 1;
1158
1159 drive->driver_data = host;
1160 idescsi = scsihost_to_idescsi(host);
1161 idescsi->drive = drive;
1162 idescsi->driver = &idescsi_driver;
1163 idescsi->host = host;
1164 idescsi->disk = g;
1165 g->private_data = &idescsi->driver;
1166 ide_register_subdriver(drive, &idescsi_driver);
1167 err = 0;
1168 idescsi_setup(drive, idescsi);
1169 g->fops = &idescsi_ops;
1170 ide_register_region(g);
1171 err = scsi_add_host(host, &drive->gendev);
1172 if (!err) {
1173 scsi_scan_host(host);
1174 return 0;
1175 }
1176 /* fall through on error */
1177 ide_unregister_region(g);
1178 ide_unregister_subdriver(drive, &idescsi_driver);
1179
1180 put_disk(g);
1181 out_host_put:
1182 scsi_host_put(host);
1183 return err;
1184 }
1185
1186 static int __init init_idescsi_module(void)
1187 {
1188 return driver_register(&idescsi_driver.gen_driver);
1189 }
1190
1191 static void __exit exit_idescsi_module(void)
1192 {
1193 driver_unregister(&idescsi_driver.gen_driver);
1194 }
1195
1196 module_init(init_idescsi_module);
1197 module_exit(exit_idescsi_module);
1198 MODULE_LICENSE("GPL");
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