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