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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
[deliverable/linux.git] / drivers / scsi / ide-scsi.c
1 /*
2 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
8 *
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
11 *
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
31 */
32
33 #define IDESCSI_VERSION "0.92"
34
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/kernel.h>
39 #include <linux/mm.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>
50
51 #include <asm/io.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
63 /*
64 * SCSI command transformation layer
65 */
66 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
67
68 /*
69 * Log flags
70 */
71 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
72
73 typedef struct ide_scsi_obj {
74 ide_drive_t *drive;
75 ide_driver_t *driver;
76 struct gendisk *disk;
77 struct Scsi_Host *host;
78
79 struct ide_atapi_pc *pc; /* Current packet command */
80 unsigned long flags; /* Status/Action flags */
81 unsigned long transform; /* SCSI cmd translation layer */
82 unsigned long log; /* log flags */
83 } idescsi_scsi_t;
84
85 static DEFINE_MUTEX(idescsi_ref_mutex);
86 /* Set by module param to skip cd */
87 static int idescsi_nocd;
88
89 #define ide_scsi_g(disk) \
90 container_of((disk)->private_data, struct ide_scsi_obj, driver)
91
92 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
93 {
94 struct ide_scsi_obj *scsi = NULL;
95
96 mutex_lock(&idescsi_ref_mutex);
97 scsi = ide_scsi_g(disk);
98 if (scsi)
99 scsi_host_get(scsi->host);
100 mutex_unlock(&idescsi_ref_mutex);
101 return scsi;
102 }
103
104 static void ide_scsi_put(struct ide_scsi_obj *scsi)
105 {
106 mutex_lock(&idescsi_ref_mutex);
107 scsi_host_put(scsi->host);
108 mutex_unlock(&idescsi_ref_mutex);
109 }
110
111 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
112 {
113 return (idescsi_scsi_t*) (&host[1]);
114 }
115
116 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
117 {
118 return scsihost_to_idescsi(ide_drive->driver_data);
119 }
120
121 /*
122 * Per ATAPI device status bits.
123 */
124 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
125
126 /*
127 * ide-scsi requests.
128 */
129 #define IDESCSI_PC_RQ 90
130
131 /*
132 * PIO data transfer routines using the scatter gather table.
133 */
134 static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
135 unsigned int bcount)
136 {
137 int count;
138 char *buf;
139
140 while (bcount) {
141 count = min(pc->sg->length - pc->b_count, bcount);
142 if (PageHighMem(sg_page(pc->sg))) {
143 unsigned long flags;
144
145 local_irq_save(flags);
146 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
147 pc->sg->offset;
148 drive->hwif->atapi_input_bytes(drive,
149 buf + pc->b_count, count);
150 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
151 local_irq_restore(flags);
152 } else {
153 buf = sg_virt(pc->sg);
154 drive->hwif->atapi_input_bytes(drive,
155 buf + pc->b_count, count);
156 }
157 bcount -= count; pc->b_count += count;
158 if (pc->b_count == pc->sg->length) {
159 if (!--pc->sg_cnt)
160 break;
161 pc->sg = sg_next(pc->sg);
162 pc->b_count = 0;
163 }
164 }
165
166 if (bcount) {
167 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
168 ide_atapi_discard_data(drive, bcount);
169 }
170 }
171
172 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
173 unsigned int bcount)
174 {
175 int count;
176 char *buf;
177
178 while (bcount) {
179 count = min(pc->sg->length - pc->b_count, bcount);
180 if (PageHighMem(sg_page(pc->sg))) {
181 unsigned long flags;
182
183 local_irq_save(flags);
184 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
185 pc->sg->offset;
186 drive->hwif->atapi_output_bytes(drive,
187 buf + pc->b_count, count);
188 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
189 local_irq_restore(flags);
190 } else {
191 buf = sg_virt(pc->sg);
192 drive->hwif->atapi_output_bytes(drive,
193 buf + pc->b_count, count);
194 }
195 bcount -= count; pc->b_count += count;
196 if (pc->b_count == pc->sg->length) {
197 if (!--pc->sg_cnt)
198 break;
199 pc->sg = sg_next(pc->sg);
200 pc->b_count = 0;
201 }
202 }
203
204 if (bcount) {
205 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
206 ide_atapi_write_zeros(drive, bcount);
207 }
208 }
209
210 static void ide_scsi_hex_dump(u8 *data, int len)
211 {
212 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
213 }
214
215 static int idescsi_check_condition(ide_drive_t *drive,
216 struct request *failed_cmd)
217 {
218 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
219 struct ide_atapi_pc *pc;
220 struct request *rq;
221 u8 *buf;
222
223 /* stuff a sense request in front of our current request */
224 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
225 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
226 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
227 if (!pc || !rq || !buf) {
228 kfree(buf);
229 kfree(rq);
230 kfree(pc);
231 return -ENOMEM;
232 }
233 ide_init_drive_cmd(rq);
234 rq->special = (char *) pc;
235 pc->rq = rq;
236 pc->buf = buf;
237 pc->c[0] = REQUEST_SENSE;
238 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
239 rq->cmd_type = REQ_TYPE_SENSE;
240 pc->timeout = jiffies + WAIT_READY;
241 /* NOTE! Save the failed packet command in "rq->buffer" */
242 rq->buffer = (void *) failed_cmd->special;
243 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
244 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
245 printk ("ide-scsi: %s: queue cmd = ", drive->name);
246 ide_scsi_hex_dump(pc->c, 6);
247 }
248 rq->rq_disk = scsi->disk;
249 return ide_do_drive_cmd(drive, rq, ide_preempt);
250 }
251
252 static int idescsi_end_request(ide_drive_t *, int, int);
253
254 static ide_startstop_t
255 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
256 {
257 ide_hwif_t *hwif = drive->hwif;
258
259 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
260 /* force an abort */
261 hwif->OUTB(WIN_IDLEIMMEDIATE,
262 hwif->io_ports[IDE_COMMAND_OFFSET]);
263
264 rq->errors++;
265
266 idescsi_end_request(drive, 0, 0);
267
268 return ide_stopped;
269 }
270
271 static ide_startstop_t
272 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
273 {
274 #if IDESCSI_DEBUG_LOG
275 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
276 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
277 #endif
278 rq->errors |= ERROR_MAX;
279
280 idescsi_end_request(drive, 0, 0);
281
282 return ide_stopped;
283 }
284
285 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
286 {
287 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
288 struct request *rq = HWGROUP(drive)->rq;
289 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
290 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
291 struct Scsi_Host *host;
292 int errors = rq->errors;
293 unsigned long flags;
294
295 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
296 ide_end_request(drive, uptodate, nrsecs);
297 return 0;
298 }
299 ide_end_drive_cmd (drive, 0, 0);
300 if (blk_sense_request(rq)) {
301 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
302 if (log) {
303 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
304 ide_scsi_hex_dump(pc->buf, 16);
305 }
306 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
307 SCSI_SENSE_BUFFERSIZE);
308 kfree(pc->buf);
309 kfree(pc);
310 kfree(rq);
311 pc = opc;
312 rq = pc->rq;
313 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
314 (((pc->flags & PC_FLAG_TIMEDOUT) ?
315 DID_TIME_OUT :
316 DID_OK) << 16);
317 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
318 if (log)
319 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
320 drive->name, pc->scsi_cmd->serial_number);
321 pc->scsi_cmd->result = DID_TIME_OUT << 16;
322 } else if (errors >= ERROR_MAX) {
323 pc->scsi_cmd->result = DID_ERROR << 16;
324 if (log)
325 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
326 } else if (errors) {
327 if (log)
328 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
329 if (!idescsi_check_condition(drive, rq))
330 /* we started a request sense, so we'll be back, exit for now */
331 return 0;
332 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
333 } else {
334 pc->scsi_cmd->result = DID_OK << 16;
335 }
336 host = pc->scsi_cmd->device->host;
337 spin_lock_irqsave(host->host_lock, flags);
338 pc->done(pc->scsi_cmd);
339 spin_unlock_irqrestore(host->host_lock, flags);
340 kfree(pc);
341 kfree(rq);
342 scsi->pc = NULL;
343 return 0;
344 }
345
346 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
347 {
348 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
349 }
350
351 static int idescsi_expiry(ide_drive_t *drive)
352 {
353 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
354 struct ide_atapi_pc *pc = scsi->pc;
355
356 #if IDESCSI_DEBUG_LOG
357 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
358 #endif
359 pc->flags |= PC_FLAG_TIMEDOUT;
360
361 return 0; /* we do not want the ide subsystem to retry */
362 }
363
364 /*
365 * Our interrupt handler.
366 */
367 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
368 {
369 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
370 ide_hwif_t *hwif = drive->hwif;
371 struct ide_atapi_pc *pc = scsi->pc;
372 struct request *rq = pc->rq;
373 unsigned int temp;
374 u16 bcount;
375 u8 stat, ireason;
376
377 #if IDESCSI_DEBUG_LOG
378 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
379 #endif /* IDESCSI_DEBUG_LOG */
380
381 if (pc->flags & PC_FLAG_TIMEDOUT) {
382 #if IDESCSI_DEBUG_LOG
383 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
384 pc->scsi_cmd->serial_number, jiffies);
385 #endif
386 /* end this request now - scsi should retry it*/
387 idescsi_end_request (drive, 1, 0);
388 return ide_stopped;
389 }
390 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
391 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
392 #if IDESCSI_DEBUG_LOG
393 printk ("ide-scsi: %s: DMA complete\n", drive->name);
394 #endif /* IDESCSI_DEBUG_LOG */
395 pc->xferred = pc->req_xfer;
396 (void) HWIF(drive)->ide_dma_end(drive);
397 }
398
399 /* Clear the interrupt */
400 stat = ide_read_status(drive);
401
402 if ((stat & DRQ_STAT) == 0) {
403 /* No more interrupts */
404 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
405 printk(KERN_INFO "Packet command completed, %d bytes"
406 " transferred\n", pc->xferred);
407 local_irq_enable_in_hardirq();
408 if (stat & ERR_STAT)
409 rq->errors++;
410 idescsi_end_request (drive, 1, 0);
411 return ide_stopped;
412 }
413 bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
414 hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
415 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
416
417 if (ireason & CD) {
418 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
419 return ide_do_reset (drive);
420 }
421 if (ireason & IO) {
422 temp = pc->xferred + bcount;
423 if (temp > pc->req_xfer) {
424 if (temp > pc->buf_size) {
425 printk(KERN_ERR "ide-scsi: The scsi wants to "
426 "send us more data than expected "
427 "- discarding data\n");
428 temp = pc->buf_size - pc->xferred;
429 if (temp) {
430 pc->flags &= ~PC_FLAG_WRITING;
431 if (pc->sg)
432 idescsi_input_buffers(drive, pc,
433 temp);
434 else
435 drive->hwif->atapi_input_bytes(drive, pc->cur_pos, temp);
436 printk(KERN_ERR "ide-scsi: transferred"
437 " %d of %d bytes\n",
438 temp, bcount);
439 }
440 pc->xferred += temp;
441 pc->cur_pos += temp;
442 ide_atapi_discard_data(drive, bcount - temp);
443 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
444 return ide_started;
445 }
446 #if IDESCSI_DEBUG_LOG
447 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
448 #endif /* IDESCSI_DEBUG_LOG */
449 }
450 }
451 if (ireason & IO) {
452 pc->flags &= ~PC_FLAG_WRITING;
453 if (pc->sg)
454 idescsi_input_buffers(drive, pc, bcount);
455 else
456 hwif->atapi_input_bytes(drive, pc->cur_pos,
457 bcount);
458 } else {
459 pc->flags |= PC_FLAG_WRITING;
460 if (pc->sg)
461 idescsi_output_buffers(drive, pc, bcount);
462 else
463 hwif->atapi_output_bytes(drive, pc->cur_pos,
464 bcount);
465 }
466 /* Update the current position */
467 pc->xferred += bcount;
468 pc->cur_pos += bcount;
469
470 /* And set the interrupt handler again */
471 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
472 return ide_started;
473 }
474
475 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
476 {
477 ide_hwif_t *hwif = drive->hwif;
478 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
479 struct ide_atapi_pc *pc = scsi->pc;
480 ide_startstop_t startstop;
481 u8 ireason;
482
483 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
484 printk(KERN_ERR "ide-scsi: Strange, packet command "
485 "initiated yet DRQ isn't asserted\n");
486 return startstop;
487 }
488 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
489 if ((ireason & CD) == 0 || (ireason & IO)) {
490 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
491 "issuing a packet command\n");
492 return ide_do_reset (drive);
493 }
494 BUG_ON(HWGROUP(drive)->handler != NULL);
495 /* Set the interrupt routine */
496 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
497 /* Send the actual packet */
498 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
499 if (pc->flags & PC_FLAG_DMA_OK) {
500 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
501 hwif->dma_start(drive);
502 }
503 return ide_started;
504 }
505
506 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
507 {
508 switch (pc->c[0]) {
509 case READ_6: case READ_10: case READ_12:
510 pc->flags &= ~PC_FLAG_WRITING;
511 return 0;
512 case WRITE_6: case WRITE_10: case WRITE_12:
513 pc->flags |= PC_FLAG_WRITING;
514 return 0;
515 default:
516 return 1;
517 }
518 }
519
520 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
521 {
522 ide_hwif_t *hwif = drive->hwif;
523 struct scatterlist *sg, *scsi_sg;
524 int segments;
525
526 if (!pc->req_xfer || pc->req_xfer % 1024)
527 return 1;
528
529 if (idescsi_set_direction(pc))
530 return 1;
531
532 sg = hwif->sg_table;
533 scsi_sg = scsi_sglist(pc->scsi_cmd);
534 segments = scsi_sg_count(pc->scsi_cmd);
535
536 if (segments > hwif->sg_max_nents)
537 return 1;
538
539 hwif->sg_nents = segments;
540 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
541
542 return 0;
543 }
544
545 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
546 struct ide_atapi_pc *pc)
547 {
548 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
549 ide_hwif_t *hwif = drive->hwif;
550 u16 bcount;
551 u8 dma = 0;
552
553 /* Set the current packet command */
554 scsi->pc = pc;
555 /* We haven't transferred any data yet */
556 pc->xferred = 0;
557 pc->cur_pos = pc->buf;
558 /* Request to transfer the entire buffer at once */
559 bcount = min(pc->req_xfer, 63 * 1024);
560
561 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
562 hwif->sg_mapped = 1;
563 dma = !hwif->dma_setup(drive);
564 hwif->sg_mapped = 0;
565 }
566
567 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
568
569 if (dma)
570 pc->flags |= PC_FLAG_DMA_OK;
571
572 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
573 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
574 get_timeout(pc), idescsi_expiry);
575 return ide_started;
576 } else {
577 /* Issue the packet command */
578 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
579 return idescsi_transfer_pc(drive);
580 }
581 }
582
583 /*
584 * idescsi_do_request is our request handling function.
585 */
586 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
587 {
588 #if IDESCSI_DEBUG_LOG
589 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
590 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
591 #endif /* IDESCSI_DEBUG_LOG */
592
593 if (blk_sense_request(rq) || blk_special_request(rq)) {
594 return idescsi_issue_pc(drive,
595 (struct ide_atapi_pc *) rq->special);
596 }
597 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
598 idescsi_end_request (drive, 0, 0);
599 return ide_stopped;
600 }
601
602 #ifdef CONFIG_IDE_PROC_FS
603 static void idescsi_add_settings(ide_drive_t *drive)
604 {
605 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
606
607 /*
608 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
609 */
610 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
611 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
612 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
613 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
614 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
615 }
616 #else
617 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
618 #endif
619
620 /*
621 * Driver initialization.
622 */
623 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
624 {
625 if (drive->id && (drive->id->config & 0x0060) == 0x20)
626 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
627 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
628 #if IDESCSI_DEBUG_LOG
629 set_bit(IDESCSI_LOG_CMD, &scsi->log);
630 #endif /* IDESCSI_DEBUG_LOG */
631 idescsi_add_settings(drive);
632 }
633
634 static void ide_scsi_remove(ide_drive_t *drive)
635 {
636 struct Scsi_Host *scsihost = drive->driver_data;
637 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
638 struct gendisk *g = scsi->disk;
639
640 scsi_remove_host(scsihost);
641 ide_proc_unregister_driver(drive, scsi->driver);
642
643 ide_unregister_region(g);
644
645 drive->driver_data = NULL;
646 g->private_data = NULL;
647 put_disk(g);
648
649 ide_scsi_put(scsi);
650 }
651
652 static int ide_scsi_probe(ide_drive_t *);
653
654 #ifdef CONFIG_IDE_PROC_FS
655 static ide_proc_entry_t idescsi_proc[] = {
656 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
657 { NULL, 0, NULL, NULL }
658 };
659 #endif
660
661 static ide_driver_t idescsi_driver = {
662 .gen_driver = {
663 .owner = THIS_MODULE,
664 .name = "ide-scsi",
665 .bus = &ide_bus_type,
666 },
667 .probe = ide_scsi_probe,
668 .remove = ide_scsi_remove,
669 .version = IDESCSI_VERSION,
670 .media = ide_scsi,
671 .supports_dsc_overlap = 0,
672 .do_request = idescsi_do_request,
673 .end_request = idescsi_end_request,
674 .error = idescsi_atapi_error,
675 .abort = idescsi_atapi_abort,
676 #ifdef CONFIG_IDE_PROC_FS
677 .proc = idescsi_proc,
678 #endif
679 };
680
681 static int idescsi_ide_open(struct inode *inode, struct file *filp)
682 {
683 struct gendisk *disk = inode->i_bdev->bd_disk;
684 struct ide_scsi_obj *scsi;
685
686 if (!(scsi = ide_scsi_get(disk)))
687 return -ENXIO;
688
689 return 0;
690 }
691
692 static int idescsi_ide_release(struct inode *inode, struct file *filp)
693 {
694 struct gendisk *disk = inode->i_bdev->bd_disk;
695 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
696
697 ide_scsi_put(scsi);
698
699 return 0;
700 }
701
702 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
703 unsigned int cmd, unsigned long arg)
704 {
705 struct block_device *bdev = inode->i_bdev;
706 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
707 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
708 }
709
710 static struct block_device_operations idescsi_ops = {
711 .owner = THIS_MODULE,
712 .open = idescsi_ide_open,
713 .release = idescsi_ide_release,
714 .ioctl = idescsi_ide_ioctl,
715 };
716
717 static int idescsi_slave_configure(struct scsi_device * sdp)
718 {
719 /* Configure detected device */
720 sdp->use_10_for_rw = 1;
721 sdp->use_10_for_ms = 1;
722 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
723 return 0;
724 }
725
726 static const char *idescsi_info (struct Scsi_Host *host)
727 {
728 return "SCSI host adapter emulation for IDE ATAPI devices";
729 }
730
731 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
732 {
733 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
734
735 if (cmd == SG_SET_TRANSFORM) {
736 if (arg)
737 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
738 else
739 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
740 return 0;
741 } else if (cmd == SG_GET_TRANSFORM)
742 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
743 return -EINVAL;
744 }
745
746 static int idescsi_queue (struct scsi_cmnd *cmd,
747 void (*done)(struct scsi_cmnd *))
748 {
749 struct Scsi_Host *host = cmd->device->host;
750 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
751 ide_drive_t *drive = scsi->drive;
752 struct request *rq = NULL;
753 struct ide_atapi_pc *pc = NULL;
754
755 if (!drive) {
756 scmd_printk (KERN_ERR, cmd, "drive not present\n");
757 goto abort;
758 }
759 scsi = drive_to_idescsi(drive);
760 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
761 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
762 if (rq == NULL || pc == NULL) {
763 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
764 goto abort;
765 }
766
767 memset (pc->c, 0, 12);
768 pc->flags = 0;
769 pc->rq = rq;
770 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
771 pc->buf = NULL;
772 pc->sg = scsi_sglist(cmd);
773 pc->sg_cnt = scsi_sg_count(cmd);
774 pc->b_count = 0;
775 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
776 pc->scsi_cmd = cmd;
777 pc->done = done;
778 pc->timeout = jiffies + cmd->timeout_per_command;
779
780 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
781 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
782 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
783 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
784 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
785 ide_scsi_hex_dump(pc->c, 12);
786 }
787 }
788
789 ide_init_drive_cmd (rq);
790 rq->special = (char *) pc;
791 rq->cmd_type = REQ_TYPE_SPECIAL;
792 spin_unlock_irq(host->host_lock);
793 rq->rq_disk = scsi->disk;
794 (void) ide_do_drive_cmd (drive, rq, ide_end);
795 spin_lock_irq(host->host_lock);
796 return 0;
797 abort:
798 kfree (pc);
799 kfree (rq);
800 cmd->result = DID_ERROR << 16;
801 done(cmd);
802 return 0;
803 }
804
805 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
806 {
807 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
808 ide_drive_t *drive = scsi->drive;
809 int busy;
810 int ret = FAILED;
811
812 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
813
814 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
815 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
816
817 if (!drive) {
818 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
819 WARN_ON(1);
820 goto no_drive;
821 }
822
823 /* First give it some more time, how much is "right" is hard to say :-( */
824
825 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
826 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
827 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
828
829 spin_lock_irq(&ide_lock);
830
831 /* If there is no pc running we're done (our interrupt took care of it) */
832 if (!scsi->pc) {
833 ret = SUCCESS;
834 goto ide_unlock;
835 }
836
837 /* It's somewhere in flight. Does ide subsystem agree? */
838 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
839 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
840 /*
841 * FIXME - not sure this condition can ever occur
842 */
843 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
844
845 if (blk_sense_request(scsi->pc->rq))
846 kfree(scsi->pc->buf);
847 kfree(scsi->pc->rq);
848 kfree(scsi->pc);
849 scsi->pc = NULL;
850
851 ret = SUCCESS;
852 }
853
854 ide_unlock:
855 spin_unlock_irq(&ide_lock);
856 no_drive:
857 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
858 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
859
860 return ret;
861 }
862
863 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
864 {
865 struct request *req;
866 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
867 ide_drive_t *drive = scsi->drive;
868 int ready = 0;
869 int ret = SUCCESS;
870
871 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
872
873 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
874 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
875
876 if (!drive) {
877 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
878 WARN_ON(1);
879 return FAILED;
880 }
881
882 spin_lock_irq(cmd->device->host->host_lock);
883 spin_lock(&ide_lock);
884
885 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
886 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
887 spin_unlock(&ide_lock);
888 spin_unlock_irq(cmd->device->host->host_lock);
889 return FAILED;
890 }
891
892 /* kill current request */
893 if (__blk_end_request(req, -EIO, 0))
894 BUG();
895 if (blk_sense_request(req))
896 kfree(scsi->pc->buf);
897 kfree(scsi->pc);
898 scsi->pc = NULL;
899 kfree(req);
900
901 /* now nuke the drive queue */
902 while ((req = elv_next_request(drive->queue))) {
903 if (__blk_end_request(req, -EIO, 0))
904 BUG();
905 }
906
907 HWGROUP(drive)->rq = NULL;
908 HWGROUP(drive)->handler = NULL;
909 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
910 spin_unlock(&ide_lock);
911
912 ide_do_reset(drive);
913
914 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
915
916 do {
917 spin_unlock_irq(cmd->device->host->host_lock);
918 msleep(50);
919 spin_lock_irq(cmd->device->host->host_lock);
920 } while ( HWGROUP(drive)->handler );
921
922 ready = drive_is_ready(drive);
923 HWGROUP(drive)->busy--;
924 if (!ready) {
925 printk (KERN_ERR "ide-scsi: reset failed!\n");
926 ret = FAILED;
927 }
928
929 spin_unlock_irq(cmd->device->host->host_lock);
930 return ret;
931 }
932
933 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
934 sector_t capacity, int *parm)
935 {
936 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
937 ide_drive_t *drive = idescsi->drive;
938
939 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
940 parm[0] = drive->bios_head;
941 parm[1] = drive->bios_sect;
942 parm[2] = drive->bios_cyl;
943 }
944 return 0;
945 }
946
947 static struct scsi_host_template idescsi_template = {
948 .module = THIS_MODULE,
949 .name = "idescsi",
950 .info = idescsi_info,
951 .slave_configure = idescsi_slave_configure,
952 .ioctl = idescsi_ioctl,
953 .queuecommand = idescsi_queue,
954 .eh_abort_handler = idescsi_eh_abort,
955 .eh_host_reset_handler = idescsi_eh_reset,
956 .bios_param = idescsi_bios,
957 .can_queue = 40,
958 .this_id = -1,
959 .sg_tablesize = 256,
960 .cmd_per_lun = 5,
961 .max_sectors = 128,
962 .use_clustering = DISABLE_CLUSTERING,
963 .emulated = 1,
964 .proc_name = "ide-scsi",
965 };
966
967 static int ide_scsi_probe(ide_drive_t *drive)
968 {
969 idescsi_scsi_t *idescsi;
970 struct Scsi_Host *host;
971 struct gendisk *g;
972 static int warned;
973 int err = -ENOMEM;
974
975 if (!warned && drive->media == ide_cdrom) {
976 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
977 warned = 1;
978 }
979
980 if (idescsi_nocd && drive->media == ide_cdrom)
981 return -ENODEV;
982
983 if (!strstr("ide-scsi", drive->driver_req) ||
984 !drive->present ||
985 drive->media == ide_disk ||
986 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
987 return -ENODEV;
988
989 g = alloc_disk(1 << PARTN_BITS);
990 if (!g)
991 goto out_host_put;
992
993 ide_init_disk(g, drive);
994
995 host->max_id = 1;
996
997 #if IDESCSI_DEBUG_LOG
998 if (drive->id->last_lun)
999 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1000 #endif
1001 if ((drive->id->last_lun & 0x7) != 7)
1002 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1003 else
1004 host->max_lun = 1;
1005
1006 drive->driver_data = host;
1007 idescsi = scsihost_to_idescsi(host);
1008 idescsi->drive = drive;
1009 idescsi->driver = &idescsi_driver;
1010 idescsi->host = host;
1011 idescsi->disk = g;
1012 g->private_data = &idescsi->driver;
1013 ide_proc_register_driver(drive, &idescsi_driver);
1014 err = 0;
1015 idescsi_setup(drive, idescsi);
1016 g->fops = &idescsi_ops;
1017 ide_register_region(g);
1018 err = scsi_add_host(host, &drive->gendev);
1019 if (!err) {
1020 scsi_scan_host(host);
1021 return 0;
1022 }
1023 /* fall through on error */
1024 ide_unregister_region(g);
1025 ide_proc_unregister_driver(drive, &idescsi_driver);
1026
1027 put_disk(g);
1028 out_host_put:
1029 scsi_host_put(host);
1030 return err;
1031 }
1032
1033 static int __init init_idescsi_module(void)
1034 {
1035 return driver_register(&idescsi_driver.gen_driver);
1036 }
1037
1038 static void __exit exit_idescsi_module(void)
1039 {
1040 driver_unregister(&idescsi_driver.gen_driver);
1041 }
1042
1043 module_param(idescsi_nocd, int, 0600);
1044 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1045 module_init(init_idescsi_module);
1046 module_exit(exit_idescsi_module);
1047 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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