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[SCSI] libiscsi: rename iscsi_cmd_task to iscsi_task
[linux-2.6/kvm.git] / drivers / scsi / ide-scsi.c
blob44d8d5163a1a357e2e4a41b22544f28df25823ce
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 ide_init_drive_cmd(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 pc->timeout = jiffies + WAIT_READY;
239 /* NOTE! Save the failed packet command in "rq->buffer" */
240 rq->buffer = (void *) failed_cmd->special;
241 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
242 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
243 printk ("ide-scsi: %s: queue cmd = ", drive->name);
244 ide_scsi_hex_dump(pc->c, 6);
245 }
246 rq->rq_disk = scsi->disk;
247 return ide_do_drive_cmd(drive, rq, ide_preempt);
248 }
249
250 static int idescsi_end_request(ide_drive_t *, int, int);
251
252 static ide_startstop_t
253 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
254 {
255 ide_hwif_t *hwif = drive->hwif;
256
257 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
258 /* force an abort */
259 hwif->OUTBSYNC(drive, WIN_IDLEIMMEDIATE,
260 hwif->io_ports.command_addr);
261
262 rq->errors++;
263
264 idescsi_end_request(drive, 0, 0);
265
266 return ide_stopped;
267 }
268
269 static ide_startstop_t
270 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
271 {
272 #if IDESCSI_DEBUG_LOG
273 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
274 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
275 #endif
276 rq->errors |= ERROR_MAX;
277
278 idescsi_end_request(drive, 0, 0);
279
280 return ide_stopped;
281 }
282
283 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
284 {
285 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
286 struct request *rq = HWGROUP(drive)->rq;
287 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
288 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
289 struct Scsi_Host *host;
290 int errors = rq->errors;
291 unsigned long flags;
292
293 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
294 ide_end_request(drive, uptodate, nrsecs);
295 return 0;
296 }
297 ide_end_drive_cmd (drive, 0, 0);
298 if (blk_sense_request(rq)) {
299 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
300 if (log) {
301 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
302 ide_scsi_hex_dump(pc->buf, 16);
303 }
304 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
305 SCSI_SENSE_BUFFERSIZE);
306 kfree(pc->buf);
307 kfree(pc);
308 kfree(rq);
309 pc = opc;
310 rq = pc->rq;
311 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
312 (((pc->flags & PC_FLAG_TIMEDOUT) ?
313 DID_TIME_OUT :
314 DID_OK) << 16);
315 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
316 if (log)
317 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
318 drive->name, pc->scsi_cmd->serial_number);
319 pc->scsi_cmd->result = DID_TIME_OUT << 16;
320 } else if (errors >= ERROR_MAX) {
321 pc->scsi_cmd->result = DID_ERROR << 16;
322 if (log)
323 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
324 } else if (errors) {
325 if (log)
326 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
327 if (!idescsi_check_condition(drive, rq))
328 /* we started a request sense, so we'll be back, exit for now */
329 return 0;
330 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
331 } else {
332 pc->scsi_cmd->result = DID_OK << 16;
333 }
334 host = pc->scsi_cmd->device->host;
335 spin_lock_irqsave(host->host_lock, flags);
336 pc->done(pc->scsi_cmd);
337 spin_unlock_irqrestore(host->host_lock, flags);
338 kfree(pc);
339 kfree(rq);
340 scsi->pc = NULL;
341 return 0;
342 }
343
344 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
345 {
346 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
347 }
348
349 static int idescsi_expiry(ide_drive_t *drive)
350 {
351 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
352 struct ide_atapi_pc *pc = scsi->pc;
353
354 #if IDESCSI_DEBUG_LOG
355 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
356 #endif
357 pc->flags |= PC_FLAG_TIMEDOUT;
358
359 return 0; /* we do not want the ide subsystem to retry */
360 }
361
362 /*
363 * Our interrupt handler.
364 */
365 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
366 {
367 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
368 ide_hwif_t *hwif = drive->hwif;
369 struct ide_atapi_pc *pc = scsi->pc;
370 struct request *rq = pc->rq;
371 unsigned int temp;
372 u16 bcount;
373 u8 stat, ireason;
374
375 #if IDESCSI_DEBUG_LOG
376 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
377 #endif /* IDESCSI_DEBUG_LOG */
378
379 if (pc->flags & PC_FLAG_TIMEDOUT) {
380 #if IDESCSI_DEBUG_LOG
381 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
382 pc->scsi_cmd->serial_number, jiffies);
383 #endif
384 /* end this request now - scsi should retry it*/
385 idescsi_end_request (drive, 1, 0);
386 return ide_stopped;
387 }
388 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
389 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
390 #if IDESCSI_DEBUG_LOG
391 printk ("ide-scsi: %s: DMA complete\n", drive->name);
392 #endif /* IDESCSI_DEBUG_LOG */
393 pc->xferred = pc->req_xfer;
394 (void)hwif->dma_ops->dma_end(drive);
395 }
396
397 /* Clear the interrupt */
398 stat = ide_read_status(drive);
399
400 if ((stat & DRQ_STAT) == 0) {
401 /* No more interrupts */
402 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
403 printk(KERN_INFO "Packet command completed, %d bytes"
404 " transferred\n", pc->xferred);
405 local_irq_enable_in_hardirq();
406 if (stat & ERR_STAT)
407 rq->errors++;
408 idescsi_end_request (drive, 1, 0);
409 return ide_stopped;
410 }
411 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
412 hwif->INB(hwif->io_ports.lbam_addr);
413 ireason = hwif->INB(hwif->io_ports.nsect_addr);
414
415 if (ireason & CD) {
416 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
417 return ide_do_reset (drive);
418 }
419 if (ireason & IO) {
420 temp = pc->xferred + bcount;
421 if (temp > pc->req_xfer) {
422 if (temp > pc->buf_size) {
423 printk(KERN_ERR "ide-scsi: The scsi wants to "
424 "send us more data than expected "
425 "- discarding data\n");
426 temp = pc->buf_size - pc->xferred;
427 if (temp) {
428 pc->flags &= ~PC_FLAG_WRITING;
429 if (pc->sg)
430 idescsi_input_buffers(drive, pc,
431 temp);
432 else
433 hwif->input_data(drive, NULL,
434 pc->cur_pos, temp);
435 printk(KERN_ERR "ide-scsi: transferred"
436 " %d of %d bytes\n",
437 temp, bcount);
438 }
439 pc->xferred += temp;
440 pc->cur_pos += temp;
441 ide_pad_transfer(drive, 0, bcount - temp);
442 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
443 return ide_started;
444 }
445 #if IDESCSI_DEBUG_LOG
446 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
447 #endif /* IDESCSI_DEBUG_LOG */
448 }
449 }
450 if (ireason & IO) {
451 pc->flags &= ~PC_FLAG_WRITING;
452 if (pc->sg)
453 idescsi_input_buffers(drive, pc, bcount);
454 else
455 hwif->input_data(drive, NULL, pc->cur_pos, bcount);
456 } else {
457 pc->flags |= PC_FLAG_WRITING;
458 if (pc->sg)
459 idescsi_output_buffers(drive, pc, bcount);
460 else
461 hwif->output_data(drive, NULL, pc->cur_pos, bcount);
462 }
463 /* Update the current position */
464 pc->xferred += bcount;
465 pc->cur_pos += bcount;
466
467 /* And set the interrupt handler again */
468 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
469 return ide_started;
470 }
471
472 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
473 {
474 ide_hwif_t *hwif = drive->hwif;
475 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
476 struct ide_atapi_pc *pc = scsi->pc;
477 ide_startstop_t startstop;
478 u8 ireason;
479
480 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
481 printk(KERN_ERR "ide-scsi: Strange, packet command "
482 "initiated yet DRQ isn't asserted\n");
483 return startstop;
484 }
485 ireason = hwif->INB(hwif->io_ports.nsect_addr);
486 if ((ireason & CD) == 0 || (ireason & IO)) {
487 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
488 "issuing a packet command\n");
489 return ide_do_reset (drive);
490 }
491 BUG_ON(HWGROUP(drive)->handler != NULL);
492 /* Set the interrupt routine */
493 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
494
495 /* Send the actual packet */
496 hwif->output_data(drive, NULL, scsi->pc->c, 12);
497
498 if (pc->flags & PC_FLAG_DMA_OK) {
499 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
500 hwif->dma_ops->dma_start(drive);
501 }
502 return ide_started;
503 }
504
505 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
506 {
507 switch (pc->c[0]) {
508 case READ_6: case READ_10: case READ_12:
509 pc->flags &= ~PC_FLAG_WRITING;
510 return 0;
511 case WRITE_6: case WRITE_10: case WRITE_12:
512 pc->flags |= PC_FLAG_WRITING;
513 return 0;
514 default:
515 return 1;
516 }
517 }
518
519 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
520 {
521 ide_hwif_t *hwif = drive->hwif;
522 struct scatterlist *sg, *scsi_sg;
523 int segments;
524
525 if (!pc->req_xfer || pc->req_xfer % 1024)
526 return 1;
527
528 if (idescsi_set_direction(pc))
529 return 1;
530
531 sg = hwif->sg_table;
532 scsi_sg = scsi_sglist(pc->scsi_cmd);
533 segments = scsi_sg_count(pc->scsi_cmd);
534
535 if (segments > hwif->sg_max_nents)
536 return 1;
537
538 hwif->sg_nents = segments;
539 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
540
541 return 0;
542 }
543
544 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
545 struct ide_atapi_pc *pc)
546 {
547 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
548 ide_hwif_t *hwif = drive->hwif;
549 u16 bcount;
550 u8 dma = 0;
551
552 /* Set the current packet command */
553 scsi->pc = pc;
554 /* We haven't transferred any data yet */
555 pc->xferred = 0;
556 pc->cur_pos = pc->buf;
557 /* Request to transfer the entire buffer at once */
558 bcount = min(pc->req_xfer, 63 * 1024);
559
560 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
561 hwif->sg_mapped = 1;
562 dma = !hwif->dma_ops->dma_setup(drive);
563 hwif->sg_mapped = 0;
564 }
565
566 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
567
568 if (dma)
569 pc->flags |= PC_FLAG_DMA_OK;
570
571 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
572 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
573 get_timeout(pc), idescsi_expiry);
574 return ide_started;
575 } else {
576 /* Issue the packet command */
577 ide_execute_pkt_cmd(drive);
578 return idescsi_transfer_pc(drive);
579 }
580 }
581
582 /*
583 * idescsi_do_request is our request handling function.
584 */
585 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
586 {
587 #if IDESCSI_DEBUG_LOG
588 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
589 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
590 #endif /* IDESCSI_DEBUG_LOG */
591
592 if (blk_sense_request(rq) || blk_special_request(rq)) {
593 return idescsi_issue_pc(drive,
594 (struct ide_atapi_pc *) rq->special);
595 }
596 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
597 idescsi_end_request (drive, 0, 0);
598 return ide_stopped;
599 }
600
601 #ifdef CONFIG_IDE_PROC_FS
602 static void idescsi_add_settings(ide_drive_t *drive)
603 {
604 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
605
606 /*
607 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
608 */
609 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
610 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
611 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
612 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
613 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
614 }
615 #else
616 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
617 #endif
618
619 /*
620 * Driver initialization.
621 */
622 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
623 {
624 if (drive->id && (drive->id->config & 0x0060) == 0x20)
625 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
626 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
627 #if IDESCSI_DEBUG_LOG
628 set_bit(IDESCSI_LOG_CMD, &scsi->log);
629 #endif /* IDESCSI_DEBUG_LOG */
630 idescsi_add_settings(drive);
631 }
632
633 static void ide_scsi_remove(ide_drive_t *drive)
634 {
635 struct Scsi_Host *scsihost = drive->driver_data;
636 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
637 struct gendisk *g = scsi->disk;
638
639 scsi_remove_host(scsihost);
640 ide_proc_unregister_driver(drive, scsi->driver);
641
642 ide_unregister_region(g);
643
644 drive->driver_data = NULL;
645 g->private_data = NULL;
646 put_disk(g);
647
648 ide_scsi_put(scsi);
649 }
650
651 static int ide_scsi_probe(ide_drive_t *);
652
653 #ifdef CONFIG_IDE_PROC_FS
654 static ide_proc_entry_t idescsi_proc[] = {
655 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
656 { NULL, 0, NULL, NULL }
657 };
658 #endif
659
660 static ide_driver_t idescsi_driver = {
661 .gen_driver = {
662 .owner = THIS_MODULE,
663 .name = "ide-scsi",
664 .bus = &ide_bus_type,
665 },
666 .probe = ide_scsi_probe,
667 .remove = ide_scsi_remove,
668 .version = IDESCSI_VERSION,
669 .media = ide_scsi,
670 .supports_dsc_overlap = 0,
671 .do_request = idescsi_do_request,
672 .end_request = idescsi_end_request,
673 .error = idescsi_atapi_error,
674 .abort = idescsi_atapi_abort,
675 #ifdef CONFIG_IDE_PROC_FS
676 .proc = idescsi_proc,
677 #endif
678 };
679
680 static int idescsi_ide_open(struct inode *inode, struct file *filp)
681 {
682 struct gendisk *disk = inode->i_bdev->bd_disk;
683 struct ide_scsi_obj *scsi;
684
685 if (!(scsi = ide_scsi_get(disk)))
686 return -ENXIO;
687
688 return 0;
689 }
690
691 static int idescsi_ide_release(struct inode *inode, struct file *filp)
692 {
693 struct gendisk *disk = inode->i_bdev->bd_disk;
694 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
695
696 ide_scsi_put(scsi);
697
698 return 0;
699 }
700
701 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
702 unsigned int cmd, unsigned long arg)
703 {
704 struct block_device *bdev = inode->i_bdev;
705 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
706 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
707 }
708
709 static struct block_device_operations idescsi_ops = {
710 .owner = THIS_MODULE,
711 .open = idescsi_ide_open,
712 .release = idescsi_ide_release,
713 .ioctl = idescsi_ide_ioctl,
714 };
715
716 static int idescsi_slave_configure(struct scsi_device * sdp)
717 {
718 /* Configure detected device */
719 sdp->use_10_for_rw = 1;
720 sdp->use_10_for_ms = 1;
721 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
722 return 0;
723 }
724
725 static const char *idescsi_info (struct Scsi_Host *host)
726 {
727 return "SCSI host adapter emulation for IDE ATAPI devices";
728 }
729
730 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
731 {
732 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
733
734 if (cmd == SG_SET_TRANSFORM) {
735 if (arg)
736 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
737 else
738 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
739 return 0;
740 } else if (cmd == SG_GET_TRANSFORM)
741 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
742 return -EINVAL;
743 }
744
745 static int idescsi_queue (struct scsi_cmnd *cmd,
746 void (*done)(struct scsi_cmnd *))
747 {
748 struct Scsi_Host *host = cmd->device->host;
749 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
750 ide_drive_t *drive = scsi->drive;
751 struct request *rq = NULL;
752 struct ide_atapi_pc *pc = NULL;
753
754 if (!drive) {
755 scmd_printk (KERN_ERR, cmd, "drive not present\n");
756 goto abort;
757 }
758 scsi = drive_to_idescsi(drive);
759 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
760 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
761 if (rq == NULL || pc == NULL) {
762 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
763 goto abort;
764 }
765
766 memset (pc->c, 0, 12);
767 pc->flags = 0;
768 pc->rq = rq;
769 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
770 pc->buf = NULL;
771 pc->sg = scsi_sglist(cmd);
772 pc->sg_cnt = scsi_sg_count(cmd);
773 pc->b_count = 0;
774 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
775 pc->scsi_cmd = cmd;
776 pc->done = done;
777 pc->timeout = jiffies + cmd->timeout_per_command;
778
779 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
780 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
781 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
782 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
783 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
784 ide_scsi_hex_dump(pc->c, 12);
785 }
786 }
787
788 ide_init_drive_cmd (rq);
789 rq->special = (char *) pc;
790 rq->cmd_type = REQ_TYPE_SPECIAL;
791 spin_unlock_irq(host->host_lock);
792 rq->rq_disk = scsi->disk;
793 (void) ide_do_drive_cmd (drive, rq, ide_end);
794 spin_lock_irq(host->host_lock);
795 return 0;
796 abort:
797 kfree (pc);
798 kfree (rq);
799 cmd->result = DID_ERROR << 16;
800 done(cmd);
801 return 0;
802 }
803
804 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
805 {
806 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
807 ide_drive_t *drive = scsi->drive;
808 int busy;
809 int ret = FAILED;
810
811 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
812
813 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
814 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
815
816 if (!drive) {
817 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
818 WARN_ON(1);
819 goto no_drive;
820 }
821
822 /* First give it some more time, how much is "right" is hard to say :-( */
823
824 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
825 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
826 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
827
828 spin_lock_irq(&ide_lock);
829
830 /* If there is no pc running we're done (our interrupt took care of it) */
831 if (!scsi->pc) {
832 ret = SUCCESS;
833 goto ide_unlock;
834 }
835
836 /* It's somewhere in flight. Does ide subsystem agree? */
837 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
838 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
839 /*
840 * FIXME - not sure this condition can ever occur
841 */
842 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
843
844 if (blk_sense_request(scsi->pc->rq))
845 kfree(scsi->pc->buf);
846 kfree(scsi->pc->rq);
847 kfree(scsi->pc);
848 scsi->pc = NULL;
849
850 ret = SUCCESS;
851 }
852
853 ide_unlock:
854 spin_unlock_irq(&ide_lock);
855 no_drive:
856 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
857 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
858
859 return ret;
860 }
861
862 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
863 {
864 struct request *req;
865 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
866 ide_drive_t *drive = scsi->drive;
867 int ready = 0;
868 int ret = SUCCESS;
869
870 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
871
872 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
873 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
874
875 if (!drive) {
876 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
877 WARN_ON(1);
878 return FAILED;
879 }
880
881 spin_lock_irq(cmd->device->host->host_lock);
882 spin_lock(&ide_lock);
883
884 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
885 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
886 spin_unlock(&ide_lock);
887 spin_unlock_irq(cmd->device->host->host_lock);
888 return FAILED;
889 }
890
891 /* kill current request */
892 if (__blk_end_request(req, -EIO, 0))
893 BUG();
894 if (blk_sense_request(req))
895 kfree(scsi->pc->buf);
896 kfree(scsi->pc);
897 scsi->pc = NULL;
898 kfree(req);
899
900 /* now nuke the drive queue */
901 while ((req = elv_next_request(drive->queue))) {
902 if (__blk_end_request(req, -EIO, 0))
903 BUG();
904 }
905
906 HWGROUP(drive)->rq = NULL;
907 HWGROUP(drive)->handler = NULL;
908 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
909 spin_unlock(&ide_lock);
910
911 ide_do_reset(drive);
912
913 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
914
915 do {
916 spin_unlock_irq(cmd->device->host->host_lock);
917 msleep(50);
918 spin_lock_irq(cmd->device->host->host_lock);
919 } while ( HWGROUP(drive)->handler );
920
921 ready = drive_is_ready(drive);
922 HWGROUP(drive)->busy--;
923 if (!ready) {
924 printk (KERN_ERR "ide-scsi: reset failed!\n");
925 ret = FAILED;
926 }
927
928 spin_unlock_irq(cmd->device->host->host_lock);
929 return ret;
930 }
931
932 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
933 sector_t capacity, int *parm)
934 {
935 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
936 ide_drive_t *drive = idescsi->drive;
937
938 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
939 parm[0] = drive->bios_head;
940 parm[1] = drive->bios_sect;
941 parm[2] = drive->bios_cyl;
942 }
943 return 0;
944 }
945
946 static struct scsi_host_template idescsi_template = {
947 .module = THIS_MODULE,
948 .name = "idescsi",
949 .info = idescsi_info,
950 .slave_configure = idescsi_slave_configure,
951 .ioctl = idescsi_ioctl,
952 .queuecommand = idescsi_queue,
953 .eh_abort_handler = idescsi_eh_abort,
954 .eh_host_reset_handler = idescsi_eh_reset,
955 .bios_param = idescsi_bios,
956 .can_queue = 40,
957 .this_id = -1,
958 .sg_tablesize = 256,
959 .cmd_per_lun = 5,
960 .max_sectors = 128,
961 .use_clustering = DISABLE_CLUSTERING,
962 .emulated = 1,
963 .proc_name = "ide-scsi",
964 };
965
966 static int ide_scsi_probe(ide_drive_t *drive)
967 {
968 idescsi_scsi_t *idescsi;
969 struct Scsi_Host *host;
970 struct gendisk *g;
971 static int warned;
972 int err = -ENOMEM;
973
974 if (!warned && drive->media == ide_cdrom) {
975 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
976 warned = 1;
977 }
978
979 if (idescsi_nocd && drive->media == ide_cdrom)
980 return -ENODEV;
981
982 if (!strstr("ide-scsi", drive->driver_req) ||
983 !drive->present ||
984 drive->media == ide_disk ||
985 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
986 return -ENODEV;
987
988 g = alloc_disk(1 << PARTN_BITS);
989 if (!g)
990 goto out_host_put;
991
992 ide_init_disk(g, drive);
993
994 host->max_id = 1;
995
996 #if IDESCSI_DEBUG_LOG
997 if (drive->id->last_lun)
998 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
999 #endif
1000 if ((drive->id->last_lun & 0x7) != 7)
1001 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1002 else
1003 host->max_lun = 1;
1004
1005 drive->driver_data = host;
1006 idescsi = scsihost_to_idescsi(host);
1007 idescsi->drive = drive;
1008 idescsi->driver = &idescsi_driver;
1009 idescsi->host = host;
1010 idescsi->disk = g;
1011 g->private_data = &idescsi->driver;
1012 ide_proc_register_driver(drive, &idescsi_driver);
1013 err = 0;
1014 idescsi_setup(drive, idescsi);
1015 g->fops = &idescsi_ops;
1016 ide_register_region(g);
1017 err = scsi_add_host(host, &drive->gendev);
1018 if (!err) {
1019 scsi_scan_host(host);
1020 return 0;
1021 }
1022 /* fall through on error */
1023 ide_unregister_region(g);
1024 ide_proc_unregister_driver(drive, &idescsi_driver);
1025
1026 put_disk(g);
1027 out_host_put:
1028 scsi_host_put(host);
1029 return err;
1030 }
1031
1032 static int __init init_idescsi_module(void)
1033 {
1034 return driver_register(&idescsi_driver.gen_driver);
1035 }
1036
1037 static void __exit exit_idescsi_module(void)
1038 {
1039 driver_unregister(&idescsi_driver.gen_driver);
1040 }
1041
1042 module_param(idescsi_nocd, int, 0600);
1043 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1044 module_init(init_idescsi_module);
1045 module_exit(exit_idescsi_module);
1046 MODULE_LICENSE("GPL");
kernel-based virtual machine