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ide-scsi: fix Interrupt Reason checking in idescsi_pc_intr()
[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 ide_hwif_t *hwif = drive->hwif;
138 int count;
139 char *buf;
140
141 while (bcount) {
142 count = min(pc->sg->length - pc->b_count, bcount);
143 if (PageHighMem(sg_page(pc->sg))) {
144 unsigned long flags;
145
146 local_irq_save(flags);
147 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
148 pc->sg->offset;
149 hwif->input_data(drive, NULL, 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 hwif->input_data(drive, NULL, buf + pc->b_count, count);
155 }
156 bcount -= count; pc->b_count += count;
157 if (pc->b_count == pc->sg->length) {
158 if (!--pc->sg_cnt)
159 break;
160 pc->sg = sg_next(pc->sg);
161 pc->b_count = 0;
162 }
163 }
164
165 if (bcount) {
166 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
167 ide_pad_transfer(drive, 0, bcount);
168 }
169 }
170
171 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
172 unsigned int bcount)
173 {
174 ide_hwif_t *hwif = drive->hwif;
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 hwif->output_data(drive, NULL, buf + pc->b_count, count);
187 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
188 local_irq_restore(flags);
189 } else {
190 buf = sg_virt(pc->sg);
191 hwif->output_data(drive, NULL, buf + pc->b_count, count);
192 }
193 bcount -= count; pc->b_count += count;
194 if (pc->b_count == pc->sg->length) {
195 if (!--pc->sg_cnt)
196 break;
197 pc->sg = sg_next(pc->sg);
198 pc->b_count = 0;
199 }
200 }
201
202 if (bcount) {
203 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
204 ide_pad_transfer(drive, 1, bcount);
205 }
206 }
207
208 static void ide_scsi_hex_dump(u8 *data, int len)
209 {
210 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
211 }
212
213 static int idescsi_check_condition(ide_drive_t *drive,
214 struct request *failed_cmd)
215 {
216 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
217 struct ide_atapi_pc *pc;
218 struct request *rq;
219 u8 *buf;
220
221 /* stuff a sense request in front of our current request */
222 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
223 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
224 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
225 if (!pc || !rq || !buf) {
226 kfree(buf);
227 kfree(rq);
228 kfree(pc);
229 return -ENOMEM;
230 }
231 blk_rq_init(NULL, rq);
232 rq->special = (char *) pc;
233 pc->rq = rq;
234 pc->buf = buf;
235 pc->c[0] = REQUEST_SENSE;
236 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
237 rq->cmd_type = REQ_TYPE_SENSE;
238 rq->cmd_flags |= REQ_PREEMPT;
239 pc->timeout = jiffies + WAIT_READY;
240 /* NOTE! Save the failed packet command in "rq->buffer" */
241 rq->buffer = (void *) failed_cmd->special;
242 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
243 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
244 printk ("ide-scsi: %s: queue cmd = ", drive->name);
245 ide_scsi_hex_dump(pc->c, 6);
246 }
247 rq->rq_disk = scsi->disk;
248 ide_do_drive_cmd(drive, rq);
249 return 0;
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->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
262 hwif->io_ports.command_addr);
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 if (hwif->dma_ops->dma_end(drive))
392 pc->flags |= PC_FLAG_DMA_ERROR;
393 else
394 pc->xferred = pc->req_xfer;
395 #if IDESCSI_DEBUG_LOG
396 printk ("ide-scsi: %s: DMA complete\n", drive->name);
397 #endif /* IDESCSI_DEBUG_LOG */
398 }
399
400 /* Clear the interrupt */
401 stat = ide_read_status(drive);
402
403 if ((stat & DRQ_STAT) == 0) {
404 /* No more interrupts */
405 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
406 printk(KERN_INFO "Packet command completed, %d bytes"
407 " transferred\n", pc->xferred);
408 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
409 local_irq_enable_in_hardirq();
410 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
411 rq->errors++;
412 idescsi_end_request (drive, 1, 0);
413 return ide_stopped;
414 }
415 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
416 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
417 printk(KERN_ERR "%s: The device wants to issue more interrupts "
418 "in DMA mode\n", drive->name);
419 ide_dma_off(drive);
420 return ide_do_reset(drive);
421 }
422 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
423 hwif->INB(hwif->io_ports.lbam_addr);
424 ireason = hwif->INB(hwif->io_ports.nsect_addr);
425
426 if (ireason & CD) {
427 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
428 return ide_do_reset (drive);
429 }
430 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
431 /* Hopefully, we will never get here */
432 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
433 "to %s!\n", drive->name,
434 (ireason & IO) ? "Write" : "Read",
435 (ireason & IO) ? "Read" : "Write");
436 return ide_do_reset(drive);
437 }
438 if (!(pc->flags & PC_FLAG_WRITING)) {
439 temp = pc->xferred + bcount;
440 if (temp > pc->req_xfer) {
441 if (temp > pc->buf_size) {
442 printk(KERN_ERR "ide-scsi: The scsi wants to "
443 "send us more data than expected "
444 "- discarding data\n");
445 temp = pc->buf_size - pc->xferred;
446 if (temp) {
447 if (pc->sg)
448 idescsi_input_buffers(drive, pc,
449 temp);
450 else
451 hwif->input_data(drive, NULL,
452 pc->cur_pos, temp);
453 printk(KERN_ERR "ide-scsi: transferred"
454 " %d of %d bytes\n",
455 temp, bcount);
456 }
457 pc->xferred += temp;
458 pc->cur_pos += temp;
459 ide_pad_transfer(drive, 0, bcount - temp);
460 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
461 return ide_started;
462 }
463 #if IDESCSI_DEBUG_LOG
464 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
465 #endif /* IDESCSI_DEBUG_LOG */
466 }
467 if (pc->sg)
468 idescsi_input_buffers(drive, pc, bcount);
469 else
470 hwif->input_data(drive, NULL, pc->cur_pos, bcount);
471 } else {
472 if (pc->sg)
473 idescsi_output_buffers(drive, pc, bcount);
474 else
475 hwif->output_data(drive, NULL, pc->cur_pos, bcount);
476 }
477 /* Update the current position */
478 pc->xferred += bcount;
479 pc->cur_pos += bcount;
480
481 /* And set the interrupt handler again */
482 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
483 return ide_started;
484 }
485
486 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
487 {
488 ide_hwif_t *hwif = drive->hwif;
489 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
490 struct ide_atapi_pc *pc = scsi->pc;
491 ide_startstop_t startstop;
492 u8 ireason;
493
494 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
495 printk(KERN_ERR "ide-scsi: Strange, packet command "
496 "initiated yet DRQ isn't asserted\n");
497 return startstop;
498 }
499 ireason = hwif->INB(hwif->io_ports.nsect_addr);
500 if ((ireason & CD) == 0 || (ireason & IO)) {
501 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
502 "issuing a packet command\n");
503 return ide_do_reset (drive);
504 }
505 BUG_ON(HWGROUP(drive)->handler != NULL);
506 /* Set the interrupt routine */
507 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
508
509 if (pc->flags & PC_FLAG_DMA_OK) {
510 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
511 hwif->dma_ops->dma_start(drive);
512 }
513
514 /* Send the actual packet */
515 hwif->output_data(drive, NULL, scsi->pc->c, 12);
516
517 return ide_started;
518 }
519
520 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
521 {
522 switch (pc->c[0]) {
523 case READ_6: case READ_10: case READ_12:
524 pc->flags &= ~PC_FLAG_WRITING;
525 return 0;
526 case WRITE_6: case WRITE_10: case WRITE_12:
527 pc->flags |= PC_FLAG_WRITING;
528 return 0;
529 default:
530 return 1;
531 }
532 }
533
534 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
535 {
536 ide_hwif_t *hwif = drive->hwif;
537 struct scatterlist *sg, *scsi_sg;
538 int segments;
539
540 if (!pc->req_xfer || pc->req_xfer % 1024)
541 return 1;
542
543 if (idescsi_set_direction(pc))
544 return 1;
545
546 sg = hwif->sg_table;
547 scsi_sg = scsi_sglist(pc->scsi_cmd);
548 segments = scsi_sg_count(pc->scsi_cmd);
549
550 if (segments > hwif->sg_max_nents)
551 return 1;
552
553 hwif->sg_nents = segments;
554 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
555
556 return 0;
557 }
558
559 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
560 struct ide_atapi_pc *pc)
561 {
562 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
563 ide_hwif_t *hwif = drive->hwif;
564 u16 bcount;
565 u8 dma = 0;
566
567 /* Set the current packet command */
568 scsi->pc = pc;
569 /* We haven't transferred any data yet */
570 pc->xferred = 0;
571 pc->cur_pos = pc->buf;
572 /* Request to transfer the entire buffer at once */
573 bcount = min(pc->req_xfer, 63 * 1024);
574
575 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
576 hwif->sg_mapped = 1;
577 dma = !hwif->dma_ops->dma_setup(drive);
578 hwif->sg_mapped = 0;
579 }
580
581 ide_pktcmd_tf_load(drive, 0, bcount, dma);
582
583 if (dma)
584 pc->flags |= PC_FLAG_DMA_OK;
585
586 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
587 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
588 get_timeout(pc), idescsi_expiry);
589 return ide_started;
590 } else {
591 /* Issue the packet command */
592 ide_execute_pkt_cmd(drive);
593 return idescsi_transfer_pc(drive);
594 }
595 }
596
597 /*
598 * idescsi_do_request is our request handling function.
599 */
600 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
601 {
602 #if IDESCSI_DEBUG_LOG
603 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
604 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
605 #endif /* IDESCSI_DEBUG_LOG */
606
607 if (blk_sense_request(rq) || blk_special_request(rq)) {
608 return idescsi_issue_pc(drive,
609 (struct ide_atapi_pc *) rq->special);
610 }
611 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
612 idescsi_end_request (drive, 0, 0);
613 return ide_stopped;
614 }
615
616 #ifdef CONFIG_IDE_PROC_FS
617 static void idescsi_add_settings(ide_drive_t *drive)
618 {
619 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
620
621 /*
622 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
623 */
624 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
625 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
626 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
627 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
628 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
629 }
630 #else
631 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
632 #endif
633
634 /*
635 * Driver initialization.
636 */
637 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
638 {
639 if (drive->id && (drive->id->config & 0x0060) == 0x20)
640 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
641 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
642 #if IDESCSI_DEBUG_LOG
643 set_bit(IDESCSI_LOG_CMD, &scsi->log);
644 #endif /* IDESCSI_DEBUG_LOG */
645 idescsi_add_settings(drive);
646 }
647
648 static void ide_scsi_remove(ide_drive_t *drive)
649 {
650 struct Scsi_Host *scsihost = drive->driver_data;
651 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
652 struct gendisk *g = scsi->disk;
653
654 scsi_remove_host(scsihost);
655 ide_proc_unregister_driver(drive, scsi->driver);
656
657 ide_unregister_region(g);
658
659 drive->driver_data = NULL;
660 g->private_data = NULL;
661 put_disk(g);
662
663 ide_scsi_put(scsi);
664 }
665
666 static int ide_scsi_probe(ide_drive_t *);
667
668 #ifdef CONFIG_IDE_PROC_FS
669 static ide_proc_entry_t idescsi_proc[] = {
670 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
671 { NULL, 0, NULL, NULL }
672 };
673 #endif
674
675 static ide_driver_t idescsi_driver = {
676 .gen_driver = {
677 .owner = THIS_MODULE,
678 .name = "ide-scsi",
679 .bus = &ide_bus_type,
680 },
681 .probe = ide_scsi_probe,
682 .remove = ide_scsi_remove,
683 .version = IDESCSI_VERSION,
684 .media = ide_scsi,
685 .supports_dsc_overlap = 0,
686 .do_request = idescsi_do_request,
687 .end_request = idescsi_end_request,
688 .error = idescsi_atapi_error,
689 .abort = idescsi_atapi_abort,
690 #ifdef CONFIG_IDE_PROC_FS
691 .proc = idescsi_proc,
692 #endif
693 };
694
695 static int idescsi_ide_open(struct inode *inode, struct file *filp)
696 {
697 struct gendisk *disk = inode->i_bdev->bd_disk;
698 struct ide_scsi_obj *scsi;
699
700 if (!(scsi = ide_scsi_get(disk)))
701 return -ENXIO;
702
703 return 0;
704 }
705
706 static int idescsi_ide_release(struct inode *inode, struct file *filp)
707 {
708 struct gendisk *disk = inode->i_bdev->bd_disk;
709 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
710
711 ide_scsi_put(scsi);
712
713 return 0;
714 }
715
716 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
717 unsigned int cmd, unsigned long arg)
718 {
719 struct block_device *bdev = inode->i_bdev;
720 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
721 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
722 }
723
724 static struct block_device_operations idescsi_ops = {
725 .owner = THIS_MODULE,
726 .open = idescsi_ide_open,
727 .release = idescsi_ide_release,
728 .ioctl = idescsi_ide_ioctl,
729 };
730
731 static int idescsi_slave_configure(struct scsi_device * sdp)
732 {
733 /* Configure detected device */
734 sdp->use_10_for_rw = 1;
735 sdp->use_10_for_ms = 1;
736 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
737 return 0;
738 }
739
740 static const char *idescsi_info (struct Scsi_Host *host)
741 {
742 return "SCSI host adapter emulation for IDE ATAPI devices";
743 }
744
745 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
746 {
747 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
748
749 if (cmd == SG_SET_TRANSFORM) {
750 if (arg)
751 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
752 else
753 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
754 return 0;
755 } else if (cmd == SG_GET_TRANSFORM)
756 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
757 return -EINVAL;
758 }
759
760 static int idescsi_queue (struct scsi_cmnd *cmd,
761 void (*done)(struct scsi_cmnd *))
762 {
763 struct Scsi_Host *host = cmd->device->host;
764 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
765 ide_drive_t *drive = scsi->drive;
766 struct request *rq = NULL;
767 struct ide_atapi_pc *pc = NULL;
768
769 if (!drive) {
770 scmd_printk (KERN_ERR, cmd, "drive not present\n");
771 goto abort;
772 }
773 scsi = drive_to_idescsi(drive);
774 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
775 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
776 if (rq == NULL || pc == NULL) {
777 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
778 goto abort;
779 }
780
781 memset (pc->c, 0, 12);
782 pc->flags = 0;
783 if (cmd->sc_data_direction == DMA_TO_DEVICE)
784 pc->flags |= PC_FLAG_WRITING;
785 pc->rq = rq;
786 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
787 pc->buf = NULL;
788 pc->sg = scsi_sglist(cmd);
789 pc->sg_cnt = scsi_sg_count(cmd);
790 pc->b_count = 0;
791 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
792 pc->scsi_cmd = cmd;
793 pc->done = done;
794 pc->timeout = jiffies + cmd->timeout_per_command;
795
796 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
797 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
798 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
799 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
800 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
801 ide_scsi_hex_dump(pc->c, 12);
802 }
803 }
804
805 blk_rq_init(NULL, rq);
806 rq->special = (char *) pc;
807 rq->cmd_type = REQ_TYPE_SPECIAL;
808 spin_unlock_irq(host->host_lock);
809 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
810 spin_lock_irq(host->host_lock);
811 return 0;
812 abort:
813 kfree (pc);
814 kfree (rq);
815 cmd->result = DID_ERROR << 16;
816 done(cmd);
817 return 0;
818 }
819
820 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
821 {
822 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
823 ide_drive_t *drive = scsi->drive;
824 int busy;
825 int ret = FAILED;
826
827 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
828
829 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
830 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
831
832 if (!drive) {
833 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
834 WARN_ON(1);
835 goto no_drive;
836 }
837
838 /* First give it some more time, how much is "right" is hard to say :-( */
839
840 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
841 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
842 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
843
844 spin_lock_irq(&ide_lock);
845
846 /* If there is no pc running we're done (our interrupt took care of it) */
847 if (!scsi->pc) {
848 ret = SUCCESS;
849 goto ide_unlock;
850 }
851
852 /* It's somewhere in flight. Does ide subsystem agree? */
853 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
854 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
855 /*
856 * FIXME - not sure this condition can ever occur
857 */
858 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
859
860 if (blk_sense_request(scsi->pc->rq))
861 kfree(scsi->pc->buf);
862 kfree(scsi->pc->rq);
863 kfree(scsi->pc);
864 scsi->pc = NULL;
865
866 ret = SUCCESS;
867 }
868
869 ide_unlock:
870 spin_unlock_irq(&ide_lock);
871 no_drive:
872 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
873 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
874
875 return ret;
876 }
877
878 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
879 {
880 struct request *req;
881 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
882 ide_drive_t *drive = scsi->drive;
883 int ready = 0;
884 int ret = SUCCESS;
885
886 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
887
888 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
889 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
890
891 if (!drive) {
892 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
893 WARN_ON(1);
894 return FAILED;
895 }
896
897 spin_lock_irq(cmd->device->host->host_lock);
898 spin_lock(&ide_lock);
899
900 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
901 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
902 spin_unlock(&ide_lock);
903 spin_unlock_irq(cmd->device->host->host_lock);
904 return FAILED;
905 }
906
907 /* kill current request */
908 if (__blk_end_request(req, -EIO, 0))
909 BUG();
910 if (blk_sense_request(req))
911 kfree(scsi->pc->buf);
912 kfree(scsi->pc);
913 scsi->pc = NULL;
914 kfree(req);
915
916 /* now nuke the drive queue */
917 while ((req = elv_next_request(drive->queue))) {
918 if (__blk_end_request(req, -EIO, 0))
919 BUG();
920 }
921
922 HWGROUP(drive)->rq = NULL;
923 HWGROUP(drive)->handler = NULL;
924 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
925 spin_unlock(&ide_lock);
926
927 ide_do_reset(drive);
928
929 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
930
931 do {
932 spin_unlock_irq(cmd->device->host->host_lock);
933 msleep(50);
934 spin_lock_irq(cmd->device->host->host_lock);
935 } while ( HWGROUP(drive)->handler );
936
937 ready = drive_is_ready(drive);
938 HWGROUP(drive)->busy--;
939 if (!ready) {
940 printk (KERN_ERR "ide-scsi: reset failed!\n");
941 ret = FAILED;
942 }
943
944 spin_unlock_irq(cmd->device->host->host_lock);
945 return ret;
946 }
947
948 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
949 sector_t capacity, int *parm)
950 {
951 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
952 ide_drive_t *drive = idescsi->drive;
953
954 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
955 parm[0] = drive->bios_head;
956 parm[1] = drive->bios_sect;
957 parm[2] = drive->bios_cyl;
958 }
959 return 0;
960 }
961
962 static struct scsi_host_template idescsi_template = {
963 .module = THIS_MODULE,
964 .name = "idescsi",
965 .info = idescsi_info,
966 .slave_configure = idescsi_slave_configure,
967 .ioctl = idescsi_ioctl,
968 .queuecommand = idescsi_queue,
969 .eh_abort_handler = idescsi_eh_abort,
970 .eh_host_reset_handler = idescsi_eh_reset,
971 .bios_param = idescsi_bios,
972 .can_queue = 40,
973 .this_id = -1,
974 .sg_tablesize = 256,
975 .cmd_per_lun = 5,
976 .max_sectors = 128,
977 .use_clustering = DISABLE_CLUSTERING,
978 .emulated = 1,
979 .proc_name = "ide-scsi",
980 };
981
982 static int ide_scsi_probe(ide_drive_t *drive)
983 {
984 idescsi_scsi_t *idescsi;
985 struct Scsi_Host *host;
986 struct gendisk *g;
987 static int warned;
988 int err = -ENOMEM;
989
990 if (!warned && drive->media == ide_cdrom) {
991 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
992 warned = 1;
993 }
994
995 if (idescsi_nocd && drive->media == ide_cdrom)
996 return -ENODEV;
997
998 if (!strstr("ide-scsi", drive->driver_req) ||
999 !drive->present ||
1000 drive->media == ide_disk ||
1001 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1002 return -ENODEV;
1003
1004 g = alloc_disk(1 << PARTN_BITS);
1005 if (!g)
1006 goto out_host_put;
1007
1008 ide_init_disk(g, drive);
1009
1010 host->max_id = 1;
1011
1012 #if IDESCSI_DEBUG_LOG
1013 if (drive->id->last_lun)
1014 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1015 #endif
1016 if ((drive->id->last_lun & 0x7) != 7)
1017 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1018 else
1019 host->max_lun = 1;
1020
1021 drive->driver_data = host;
1022 idescsi = scsihost_to_idescsi(host);
1023 idescsi->drive = drive;
1024 idescsi->driver = &idescsi_driver;
1025 idescsi->host = host;
1026 idescsi->disk = g;
1027 g->private_data = &idescsi->driver;
1028 ide_proc_register_driver(drive, &idescsi_driver);
1029 err = 0;
1030 idescsi_setup(drive, idescsi);
1031 g->fops = &idescsi_ops;
1032 ide_register_region(g);
1033 err = scsi_add_host(host, &drive->gendev);
1034 if (!err) {
1035 scsi_scan_host(host);
1036 return 0;
1037 }
1038 /* fall through on error */
1039 ide_unregister_region(g);
1040 ide_proc_unregister_driver(drive, &idescsi_driver);
1041
1042 put_disk(g);
1043 out_host_put:
1044 scsi_host_put(host);
1045 return err;
1046 }
1047
1048 static int __init init_idescsi_module(void)
1049 {
1050 return driver_register(&idescsi_driver.gen_driver);
1051 }
1052
1053 static void __exit exit_idescsi_module(void)
1054 {
1055 driver_unregister(&idescsi_driver.gen_driver);
1056 }
1057
1058 module_param(idescsi_nocd, int, 0600);
1059 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1060 module_init(init_idescsi_module);
1061 module_exit(exit_idescsi_module);
1062 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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