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ide-scsi: convert driver to using generic ide_atapi_pc
[linux-2.6/libata-dev.git] / drivers / scsi / ide-scsi.c
blob5ec421c988d4c1c3b72ca75972809901210aba3a
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 * Packet command status bits.
65 */
66 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
67 #define PC_WRITING 1 /* Data direction */
68 #define PC_TIMEDOUT 3 /* command timed out */
69 #define PC_DMA_OK 4 /* Use DMA */
70
71 /*
72 * SCSI command transformation layer
73 */
74 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
75
76 /*
77 * Log flags
78 */
79 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
80
81 typedef struct ide_scsi_obj {
82 ide_drive_t *drive;
83 ide_driver_t *driver;
84 struct gendisk *disk;
85 struct Scsi_Host *host;
86
87 struct ide_atapi_pc *pc; /* Current packet command */
88 unsigned long flags; /* Status/Action flags */
89 unsigned long transform; /* SCSI cmd translation layer */
90 unsigned long log; /* log flags */
91 } idescsi_scsi_t;
92
93 static DEFINE_MUTEX(idescsi_ref_mutex);
94 /* Set by module param to skip cd */
95 static int idescsi_nocd;
96
97 #define ide_scsi_g(disk) \
98 container_of((disk)->private_data, struct ide_scsi_obj, driver)
99
100 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
101 {
102 struct ide_scsi_obj *scsi = NULL;
103
104 mutex_lock(&idescsi_ref_mutex);
105 scsi = ide_scsi_g(disk);
106 if (scsi)
107 scsi_host_get(scsi->host);
108 mutex_unlock(&idescsi_ref_mutex);
109 return scsi;
110 }
111
112 static void ide_scsi_put(struct ide_scsi_obj *scsi)
113 {
114 mutex_lock(&idescsi_ref_mutex);
115 scsi_host_put(scsi->host);
116 mutex_unlock(&idescsi_ref_mutex);
117 }
118
119 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
120 {
121 return (idescsi_scsi_t*) (&host[1]);
122 }
123
124 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
125 {
126 return scsihost_to_idescsi(ide_drive->driver_data);
127 }
128
129 /*
130 * Per ATAPI device status bits.
131 */
132 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
133
134 /*
135 * ide-scsi requests.
136 */
137 #define IDESCSI_PC_RQ 90
138
139 /*
140 * PIO data transfer routines using the scatter gather table.
141 */
142 static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
143 unsigned int bcount)
144 {
145 int count;
146 char *buf;
147
148 while (bcount) {
149 count = min(pc->sg->length - pc->b_count, bcount);
150 if (PageHighMem(sg_page(pc->sg))) {
151 unsigned long flags;
152
153 local_irq_save(flags);
154 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
155 pc->sg->offset;
156 drive->hwif->atapi_input_bytes(drive,
157 buf + pc->b_count, count);
158 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
159 local_irq_restore(flags);
160 } else {
161 buf = sg_virt(pc->sg);
162 drive->hwif->atapi_input_bytes(drive,
163 buf + pc->b_count, count);
164 }
165 bcount -= count; pc->b_count += count;
166 if (pc->b_count == pc->sg->length) {
167 if (!--pc->sg_cnt)
168 break;
169 pc->sg = sg_next(pc->sg);
170 pc->b_count = 0;
171 }
172 }
173
174 if (bcount) {
175 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
176 ide_atapi_discard_data(drive, bcount);
177 }
178 }
179
180 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
181 unsigned int bcount)
182 {
183 int count;
184 char *buf;
185
186 while (bcount) {
187 count = min(pc->sg->length - pc->b_count, bcount);
188 if (PageHighMem(sg_page(pc->sg))) {
189 unsigned long flags;
190
191 local_irq_save(flags);
192 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
193 pc->sg->offset;
194 drive->hwif->atapi_output_bytes(drive,
195 buf + pc->b_count, count);
196 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
197 local_irq_restore(flags);
198 } else {
199 buf = sg_virt(pc->sg);
200 drive->hwif->atapi_output_bytes(drive,
201 buf + pc->b_count, count);
202 }
203 bcount -= count; pc->b_count += count;
204 if (pc->b_count == pc->sg->length) {
205 if (!--pc->sg_cnt)
206 break;
207 pc->sg = sg_next(pc->sg);
208 pc->b_count = 0;
209 }
210 }
211
212 if (bcount) {
213 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
214 ide_atapi_write_zeros(drive, bcount);
215 }
216 }
217
218 static void ide_scsi_hex_dump(u8 *data, int len)
219 {
220 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
221 }
222
223 static int idescsi_check_condition(ide_drive_t *drive,
224 struct request *failed_cmd)
225 {
226 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
227 struct ide_atapi_pc *pc;
228 struct request *rq;
229 u8 *buf;
230
231 /* stuff a sense request in front of our current request */
232 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
233 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
234 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
235 if (!pc || !rq || !buf) {
236 kfree(buf);
237 kfree(rq);
238 kfree(pc);
239 return -ENOMEM;
240 }
241 ide_init_drive_cmd(rq);
242 rq->special = (char *) pc;
243 pc->rq = rq;
244 pc->buf = buf;
245 pc->c[0] = REQUEST_SENSE;
246 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
247 rq->cmd_type = REQ_TYPE_SENSE;
248 pc->timeout = jiffies + WAIT_READY;
249 /* NOTE! Save the failed packet command in "rq->buffer" */
250 rq->buffer = (void *) failed_cmd->special;
251 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
252 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
253 printk ("ide-scsi: %s: queue cmd = ", drive->name);
254 ide_scsi_hex_dump(pc->c, 6);
255 }
256 rq->rq_disk = scsi->disk;
257 return ide_do_drive_cmd(drive, rq, ide_preempt);
258 }
259
260 static int idescsi_end_request(ide_drive_t *, int, int);
261
262 static ide_startstop_t
263 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
264 {
265 ide_hwif_t *hwif = drive->hwif;
266
267 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
268 /* force an abort */
269 hwif->OUTB(WIN_IDLEIMMEDIATE,
270 hwif->io_ports[IDE_COMMAND_OFFSET]);
271
272 rq->errors++;
273
274 idescsi_end_request(drive, 0, 0);
275
276 return ide_stopped;
277 }
278
279 static ide_startstop_t
280 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
281 {
282 #if IDESCSI_DEBUG_LOG
283 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
284 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
285 #endif
286 rq->errors |= ERROR_MAX;
287
288 idescsi_end_request(drive, 0, 0);
289
290 return ide_stopped;
291 }
292
293 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
294 {
295 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
296 struct request *rq = HWGROUP(drive)->rq;
297 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
298 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
299 struct Scsi_Host *host;
300 int errors = rq->errors;
301 unsigned long flags;
302
303 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
304 ide_end_request(drive, uptodate, nrsecs);
305 return 0;
306 }
307 ide_end_drive_cmd (drive, 0, 0);
308 if (blk_sense_request(rq)) {
309 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
310 if (log) {
311 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
312 ide_scsi_hex_dump(pc->buf, 16);
313 }
314 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
315 SCSI_SENSE_BUFFERSIZE);
316 kfree(pc->buf);
317 kfree(pc);
318 kfree(rq);
319 pc = opc;
320 rq = pc->rq;
321 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
322 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
323 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
324 if (log)
325 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
326 drive->name, pc->scsi_cmd->serial_number);
327 pc->scsi_cmd->result = DID_TIME_OUT << 16;
328 } else if (errors >= ERROR_MAX) {
329 pc->scsi_cmd->result = DID_ERROR << 16;
330 if (log)
331 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
332 } else if (errors) {
333 if (log)
334 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
335 if (!idescsi_check_condition(drive, rq))
336 /* we started a request sense, so we'll be back, exit for now */
337 return 0;
338 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
339 } else {
340 pc->scsi_cmd->result = DID_OK << 16;
341 }
342 host = pc->scsi_cmd->device->host;
343 spin_lock_irqsave(host->host_lock, flags);
344 pc->done(pc->scsi_cmd);
345 spin_unlock_irqrestore(host->host_lock, flags);
346 kfree(pc);
347 kfree(rq);
348 scsi->pc = NULL;
349 return 0;
350 }
351
352 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
353 {
354 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
355 }
356
357 static int idescsi_expiry(ide_drive_t *drive)
358 {
359 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
360 struct ide_atapi_pc *pc = scsi->pc;
361
362 #if IDESCSI_DEBUG_LOG
363 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
364 #endif
365 set_bit(PC_TIMEDOUT, &pc->flags);
366
367 return 0; /* we do not want the ide subsystem to retry */
368 }
369
370 /*
371 * Our interrupt handler.
372 */
373 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
374 {
375 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
376 ide_hwif_t *hwif = drive->hwif;
377 struct ide_atapi_pc *pc = scsi->pc;
378 struct request *rq = pc->rq;
379 unsigned int temp;
380 u16 bcount;
381 u8 stat, ireason;
382
383 #if IDESCSI_DEBUG_LOG
384 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
385 #endif /* IDESCSI_DEBUG_LOG */
386
387 if (test_bit(PC_TIMEDOUT, &pc->flags)){
388 #if IDESCSI_DEBUG_LOG
389 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
390 pc->scsi_cmd->serial_number, jiffies);
391 #endif
392 /* end this request now - scsi should retry it*/
393 idescsi_end_request (drive, 1, 0);
394 return ide_stopped;
395 }
396 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
397 #if IDESCSI_DEBUG_LOG
398 printk ("ide-scsi: %s: DMA complete\n", drive->name);
399 #endif /* IDESCSI_DEBUG_LOG */
400 pc->xferred = pc->req_xfer;
401 (void) HWIF(drive)->ide_dma_end(drive);
402 }
403
404 /* Clear the interrupt */
405 stat = ide_read_status(drive);
406
407 if ((stat & DRQ_STAT) == 0) {
408 /* No more interrupts */
409 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
410 printk(KERN_INFO "Packet command completed, %d bytes"
411 " transferred\n", pc->xferred);
412 local_irq_enable_in_hardirq();
413 if (stat & ERR_STAT)
414 rq->errors++;
415 idescsi_end_request (drive, 1, 0);
416 return ide_stopped;
417 }
418 bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
419 hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
420 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
421
422 if (ireason & CD) {
423 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
424 return ide_do_reset (drive);
425 }
426 if (ireason & IO) {
427 temp = pc->xferred + bcount;
428 if (temp > pc->req_xfer) {
429 if (temp > pc->buf_size) {
430 printk(KERN_ERR "ide-scsi: The scsi wants to "
431 "send us more data than expected "
432 "- discarding data\n");
433 temp = pc->buf_size - pc->xferred;
434 if (temp) {
435 clear_bit(PC_WRITING, &pc->flags);
436 if (pc->sg)
437 idescsi_input_buffers(drive, pc,
438 temp);
439 else
440 drive->hwif->atapi_input_bytes(drive, pc->cur_pos, temp);
441 printk(KERN_ERR "ide-scsi: transferred"
442 " %d of %d bytes\n",
443 temp, bcount);
444 }
445 pc->xferred += temp;
446 pc->cur_pos += temp;
447 ide_atapi_discard_data(drive, bcount - temp);
448 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
449 return ide_started;
450 }
451 #if IDESCSI_DEBUG_LOG
452 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
453 #endif /* IDESCSI_DEBUG_LOG */
454 }
455 }
456 if (ireason & IO) {
457 clear_bit(PC_WRITING, &pc->flags);
458 if (pc->sg)
459 idescsi_input_buffers(drive, pc, bcount);
460 else
461 hwif->atapi_input_bytes(drive, pc->cur_pos,
462 bcount);
463 } else {
464 set_bit(PC_WRITING, &pc->flags);
465 if (pc->sg)
466 idescsi_output_buffers(drive, pc, bcount);
467 else
468 hwif->atapi_output_bytes(drive, pc->cur_pos,
469 bcount);
470 }
471 /* Update the current position */
472 pc->xferred += bcount;
473 pc->cur_pos += bcount;
474
475 /* And set the interrupt handler again */
476 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
477 return ide_started;
478 }
479
480 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
481 {
482 ide_hwif_t *hwif = drive->hwif;
483 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
484 struct ide_atapi_pc *pc = scsi->pc;
485 ide_startstop_t startstop;
486 u8 ireason;
487
488 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
489 printk(KERN_ERR "ide-scsi: Strange, packet command "
490 "initiated yet DRQ isn't asserted\n");
491 return startstop;
492 }
493 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
494 if ((ireason & CD) == 0 || (ireason & IO)) {
495 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
496 "issuing a packet command\n");
497 return ide_do_reset (drive);
498 }
499 BUG_ON(HWGROUP(drive)->handler != NULL);
500 /* Set the interrupt routine */
501 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
502 /* Send the actual packet */
503 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
504 if (test_bit (PC_DMA_OK, &pc->flags)) {
505 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
506 hwif->dma_start(drive);
507 }
508 return ide_started;
509 }
510
511 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
512 {
513 switch (pc->c[0]) {
514 case READ_6: case READ_10: case READ_12:
515 clear_bit(PC_WRITING, &pc->flags);
516 return 0;
517 case WRITE_6: case WRITE_10: case WRITE_12:
518 set_bit(PC_WRITING, &pc->flags);
519 return 0;
520 default:
521 return 1;
522 }
523 }
524
525 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
526 {
527 ide_hwif_t *hwif = drive->hwif;
528 struct scatterlist *sg, *scsi_sg;
529 int segments;
530
531 if (!pc->req_xfer || pc->req_xfer % 1024)
532 return 1;
533
534 if (idescsi_set_direction(pc))
535 return 1;
536
537 sg = hwif->sg_table;
538 scsi_sg = scsi_sglist(pc->scsi_cmd);
539 segments = scsi_sg_count(pc->scsi_cmd);
540
541 if (segments > hwif->sg_max_nents)
542 return 1;
543
544 hwif->sg_nents = segments;
545 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
546
547 return 0;
548 }
549
550 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
551 struct ide_atapi_pc *pc)
552 {
553 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
554 ide_hwif_t *hwif = drive->hwif;
555 u16 bcount;
556 u8 dma = 0;
557
558 /* Set the current packet command */
559 scsi->pc = pc;
560 /* We haven't transferred any data yet */
561 pc->xferred = 0;
562 pc->cur_pos = pc->buf;
563 /* Request to transfer the entire buffer at once */
564 bcount = min(pc->req_xfer, 63 * 1024);
565
566 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
567 hwif->sg_mapped = 1;
568 dma = !hwif->dma_setup(drive);
569 hwif->sg_mapped = 0;
570 }
571
572 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
573
574 if (dma)
575 set_bit(PC_DMA_OK, &pc->flags);
576
577 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
578 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
579 get_timeout(pc), idescsi_expiry);
580 return ide_started;
581 } else {
582 /* Issue the packet command */
583 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
584 return idescsi_transfer_pc(drive);
585 }
586 }
587
588 /*
589 * idescsi_do_request is our request handling function.
590 */
591 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
592 {
593 #if IDESCSI_DEBUG_LOG
594 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
595 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
596 #endif /* IDESCSI_DEBUG_LOG */
597
598 if (blk_sense_request(rq) || blk_special_request(rq)) {
599 return idescsi_issue_pc(drive,
600 (struct ide_atapi_pc *) rq->special);
601 }
602 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
603 idescsi_end_request (drive, 0, 0);
604 return ide_stopped;
605 }
606
607 #ifdef CONFIG_IDE_PROC_FS
608 static void idescsi_add_settings(ide_drive_t *drive)
609 {
610 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
611
612 /*
613 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
614 */
615 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
616 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
617 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
618 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
619 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
620 }
621 #else
622 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
623 #endif
624
625 /*
626 * Driver initialization.
627 */
628 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
629 {
630 if (drive->id && (drive->id->config & 0x0060) == 0x20)
631 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
632 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
633 #if IDESCSI_DEBUG_LOG
634 set_bit(IDESCSI_LOG_CMD, &scsi->log);
635 #endif /* IDESCSI_DEBUG_LOG */
636 idescsi_add_settings(drive);
637 }
638
639 static void ide_scsi_remove(ide_drive_t *drive)
640 {
641 struct Scsi_Host *scsihost = drive->driver_data;
642 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
643 struct gendisk *g = scsi->disk;
644
645 scsi_remove_host(scsihost);
646 ide_proc_unregister_driver(drive, scsi->driver);
647
648 ide_unregister_region(g);
649
650 drive->driver_data = NULL;
651 g->private_data = NULL;
652 put_disk(g);
653
654 ide_scsi_put(scsi);
655 }
656
657 static int ide_scsi_probe(ide_drive_t *);
658
659 #ifdef CONFIG_IDE_PROC_FS
660 static ide_proc_entry_t idescsi_proc[] = {
661 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
662 { NULL, 0, NULL, NULL }
663 };
664 #endif
665
666 static ide_driver_t idescsi_driver = {
667 .gen_driver = {
668 .owner = THIS_MODULE,
669 .name = "ide-scsi",
670 .bus = &ide_bus_type,
671 },
672 .probe = ide_scsi_probe,
673 .remove = ide_scsi_remove,
674 .version = IDESCSI_VERSION,
675 .media = ide_scsi,
676 .supports_dsc_overlap = 0,
677 .do_request = idescsi_do_request,
678 .end_request = idescsi_end_request,
679 .error = idescsi_atapi_error,
680 .abort = idescsi_atapi_abort,
681 #ifdef CONFIG_IDE_PROC_FS
682 .proc = idescsi_proc,
683 #endif
684 };
685
686 static int idescsi_ide_open(struct inode *inode, struct file *filp)
687 {
688 struct gendisk *disk = inode->i_bdev->bd_disk;
689 struct ide_scsi_obj *scsi;
690
691 if (!(scsi = ide_scsi_get(disk)))
692 return -ENXIO;
693
694 return 0;
695 }
696
697 static int idescsi_ide_release(struct inode *inode, struct file *filp)
698 {
699 struct gendisk *disk = inode->i_bdev->bd_disk;
700 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
701
702 ide_scsi_put(scsi);
703
704 return 0;
705 }
706
707 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
708 unsigned int cmd, unsigned long arg)
709 {
710 struct block_device *bdev = inode->i_bdev;
711 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
712 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
713 }
714
715 static struct block_device_operations idescsi_ops = {
716 .owner = THIS_MODULE,
717 .open = idescsi_ide_open,
718 .release = idescsi_ide_release,
719 .ioctl = idescsi_ide_ioctl,
720 };
721
722 static int idescsi_slave_configure(struct scsi_device * sdp)
723 {
724 /* Configure detected device */
725 sdp->use_10_for_rw = 1;
726 sdp->use_10_for_ms = 1;
727 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
728 return 0;
729 }
730
731 static const char *idescsi_info (struct Scsi_Host *host)
732 {
733 return "SCSI host adapter emulation for IDE ATAPI devices";
734 }
735
736 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
737 {
738 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
739
740 if (cmd == SG_SET_TRANSFORM) {
741 if (arg)
742 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
743 else
744 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
745 return 0;
746 } else if (cmd == SG_GET_TRANSFORM)
747 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
748 return -EINVAL;
749 }
750
751 static int idescsi_queue (struct scsi_cmnd *cmd,
752 void (*done)(struct scsi_cmnd *))
753 {
754 struct Scsi_Host *host = cmd->device->host;
755 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
756 ide_drive_t *drive = scsi->drive;
757 struct request *rq = NULL;
758 struct ide_atapi_pc *pc = NULL;
759
760 if (!drive) {
761 scmd_printk (KERN_ERR, cmd, "drive not present\n");
762 goto abort;
763 }
764 scsi = drive_to_idescsi(drive);
765 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
766 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
767 if (rq == NULL || pc == NULL) {
768 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
769 goto abort;
770 }
771
772 memset (pc->c, 0, 12);
773 pc->flags = 0;
774 pc->rq = rq;
775 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
776 pc->buf = NULL;
777 pc->sg = scsi_sglist(cmd);
778 pc->sg_cnt = scsi_sg_count(cmd);
779 pc->b_count = 0;
780 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
781 pc->scsi_cmd = cmd;
782 pc->done = done;
783 pc->timeout = jiffies + cmd->timeout_per_command;
784
785 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
786 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
787 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
788 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
789 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
790 ide_scsi_hex_dump(pc->c, 12);
791 }
792 }
793
794 ide_init_drive_cmd (rq);
795 rq->special = (char *) pc;
796 rq->cmd_type = REQ_TYPE_SPECIAL;
797 spin_unlock_irq(host->host_lock);
798 rq->rq_disk = scsi->disk;
799 (void) ide_do_drive_cmd (drive, rq, ide_end);
800 spin_lock_irq(host->host_lock);
801 return 0;
802 abort:
803 kfree (pc);
804 kfree (rq);
805 cmd->result = DID_ERROR << 16;
806 done(cmd);
807 return 0;
808 }
809
810 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
811 {
812 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
813 ide_drive_t *drive = scsi->drive;
814 int busy;
815 int ret = FAILED;
816
817 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
818
819 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
820 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
821
822 if (!drive) {
823 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
824 WARN_ON(1);
825 goto no_drive;
826 }
827
828 /* First give it some more time, how much is "right" is hard to say :-( */
829
830 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
831 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
832 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
833
834 spin_lock_irq(&ide_lock);
835
836 /* If there is no pc running we're done (our interrupt took care of it) */
837 if (!scsi->pc) {
838 ret = SUCCESS;
839 goto ide_unlock;
840 }
841
842 /* It's somewhere in flight. Does ide subsystem agree? */
843 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
844 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
845 /*
846 * FIXME - not sure this condition can ever occur
847 */
848 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
849
850 if (blk_sense_request(scsi->pc->rq))
851 kfree(scsi->pc->buf);
852 kfree(scsi->pc->rq);
853 kfree(scsi->pc);
854 scsi->pc = NULL;
855
856 ret = SUCCESS;
857 }
858
859 ide_unlock:
860 spin_unlock_irq(&ide_lock);
861 no_drive:
862 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
863 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
864
865 return ret;
866 }
867
868 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
869 {
870 struct request *req;
871 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
872 ide_drive_t *drive = scsi->drive;
873 int ready = 0;
874 int ret = SUCCESS;
875
876 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
877
878 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
879 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
880
881 if (!drive) {
882 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
883 WARN_ON(1);
884 return FAILED;
885 }
886
887 spin_lock_irq(cmd->device->host->host_lock);
888 spin_lock(&ide_lock);
889
890 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
891 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
892 spin_unlock(&ide_lock);
893 spin_unlock_irq(cmd->device->host->host_lock);
894 return FAILED;
895 }
896
897 /* kill current request */
898 if (__blk_end_request(req, -EIO, 0))
899 BUG();
900 if (blk_sense_request(req))
901 kfree(scsi->pc->buf);
902 kfree(scsi->pc);
903 scsi->pc = NULL;
904 kfree(req);
905
906 /* now nuke the drive queue */
907 while ((req = elv_next_request(drive->queue))) {
908 if (__blk_end_request(req, -EIO, 0))
909 BUG();
910 }
911
912 HWGROUP(drive)->rq = NULL;
913 HWGROUP(drive)->handler = NULL;
914 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
915 spin_unlock(&ide_lock);
916
917 ide_do_reset(drive);
918
919 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
920
921 do {
922 spin_unlock_irq(cmd->device->host->host_lock);
923 msleep(50);
924 spin_lock_irq(cmd->device->host->host_lock);
925 } while ( HWGROUP(drive)->handler );
926
927 ready = drive_is_ready(drive);
928 HWGROUP(drive)->busy--;
929 if (!ready) {
930 printk (KERN_ERR "ide-scsi: reset failed!\n");
931 ret = FAILED;
932 }
933
934 spin_unlock_irq(cmd->device->host->host_lock);
935 return ret;
936 }
937
938 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
939 sector_t capacity, int *parm)
940 {
941 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
942 ide_drive_t *drive = idescsi->drive;
943
944 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
945 parm[0] = drive->bios_head;
946 parm[1] = drive->bios_sect;
947 parm[2] = drive->bios_cyl;
948 }
949 return 0;
950 }
951
952 static struct scsi_host_template idescsi_template = {
953 .module = THIS_MODULE,
954 .name = "idescsi",
955 .info = idescsi_info,
956 .slave_configure = idescsi_slave_configure,
957 .ioctl = idescsi_ioctl,
958 .queuecommand = idescsi_queue,
959 .eh_abort_handler = idescsi_eh_abort,
960 .eh_host_reset_handler = idescsi_eh_reset,
961 .bios_param = idescsi_bios,
962 .can_queue = 40,
963 .this_id = -1,
964 .sg_tablesize = 256,
965 .cmd_per_lun = 5,
966 .max_sectors = 128,
967 .use_clustering = DISABLE_CLUSTERING,
968 .emulated = 1,
969 .proc_name = "ide-scsi",
970 };
971
972 static int ide_scsi_probe(ide_drive_t *drive)
973 {
974 idescsi_scsi_t *idescsi;
975 struct Scsi_Host *host;
976 struct gendisk *g;
977 static int warned;
978 int err = -ENOMEM;
979
980 if (!warned && drive->media == ide_cdrom) {
981 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
982 warned = 1;
983 }
984
985 if (idescsi_nocd && drive->media == ide_cdrom)
986 return -ENODEV;
987
988 if (!strstr("ide-scsi", drive->driver_req) ||
989 !drive->present ||
990 drive->media == ide_disk ||
991 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
992 return -ENODEV;
993
994 g = alloc_disk(1 << PARTN_BITS);
995 if (!g)
996 goto out_host_put;
997
998 ide_init_disk(g, drive);
999
1000 host->max_id = 1;
1001
1002 #if IDESCSI_DEBUG_LOG
1003 if (drive->id->last_lun)
1004 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1005 #endif
1006 if ((drive->id->last_lun & 0x7) != 7)
1007 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1008 else
1009 host->max_lun = 1;
1010
1011 drive->driver_data = host;
1012 idescsi = scsihost_to_idescsi(host);
1013 idescsi->drive = drive;
1014 idescsi->driver = &idescsi_driver;
1015 idescsi->host = host;
1016 idescsi->disk = g;
1017 g->private_data = &idescsi->driver;
1018 ide_proc_register_driver(drive, &idescsi_driver);
1019 err = 0;
1020 idescsi_setup(drive, idescsi);
1021 g->fops = &idescsi_ops;
1022 ide_register_region(g);
1023 err = scsi_add_host(host, &drive->gendev);
1024 if (!err) {
1025 scsi_scan_host(host);
1026 return 0;
1027 }
1028 /* fall through on error */
1029 ide_unregister_region(g);
1030 ide_proc_unregister_driver(drive, &idescsi_driver);
1031
1032 put_disk(g);
1033 out_host_put:
1034 scsi_host_put(host);
1035 return err;
1036 }
1037
1038 static int __init init_idescsi_module(void)
1039 {
1040 return driver_register(&idescsi_driver.gen_driver);
1041 }
1042
1043 static void __exit exit_idescsi_module(void)
1044 {
1045 driver_unregister(&idescsi_driver.gen_driver);
1046 }
1047
1048 module_param(idescsi_nocd, int, 0600);
1049 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1050 module_init(init_idescsi_module);
1051 module_exit(exit_idescsi_module);
1052 MODULE_LICENSE("GPL");
Linux 2.6 libata-dev (mirror)