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ide: make drive->id an union (take 2)
[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 transform; /* SCSI cmd translation layer */
88 unsigned long log; /* log flags */
89 } idescsi_scsi_t;
90
91 static DEFINE_MUTEX(idescsi_ref_mutex);
92 /* Set by module param to skip cd */
93 static int idescsi_nocd;
94
95 #define ide_scsi_g(disk) \
96 container_of((disk)->private_data, struct ide_scsi_obj, driver)
97
98 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
99 {
100 struct ide_scsi_obj *scsi = NULL;
101
102 mutex_lock(&idescsi_ref_mutex);
103 scsi = ide_scsi_g(disk);
104 if (scsi) {
105 if (ide_device_get(scsi->drive))
106 scsi = NULL;
107 else
108 scsi_host_get(scsi->host);
109 }
110 mutex_unlock(&idescsi_ref_mutex);
111 return scsi;
112 }
113
114 static void ide_scsi_put(struct ide_scsi_obj *scsi)
115 {
116 ide_drive_t *drive = scsi->drive;
117
118 mutex_lock(&idescsi_ref_mutex);
119 scsi_host_put(scsi->host);
120 ide_device_put(drive);
121 mutex_unlock(&idescsi_ref_mutex);
122 }
123
124 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
125 {
126 return (idescsi_scsi_t*) (&host[1]);
127 }
128
129 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
130 {
131 return scsihost_to_idescsi(ide_drive->driver_data);
132 }
133
134 /*
135 * PIO data transfer routine using the scatter gather table.
136 */
137 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
138 unsigned int bcount, int write)
139 {
140 ide_hwif_t *hwif = drive->hwif;
141 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
142 xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
143 char *buf;
144 int count;
145
146 while (bcount) {
147 count = min(pc->sg->length - pc->b_count, bcount);
148 if (PageHighMem(sg_page(pc->sg))) {
149 unsigned long flags;
150
151 local_irq_save(flags);
152 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
153 pc->sg->offset;
154 xf(drive, NULL, buf + pc->b_count, count);
155 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
156 local_irq_restore(flags);
157 } else {
158 buf = sg_virt(pc->sg);
159 xf(drive, NULL, buf + pc->b_count, count);
160 }
161 bcount -= count; pc->b_count += count;
162 if (pc->b_count == pc->sg->length) {
163 if (!--pc->sg_cnt)
164 break;
165 pc->sg = sg_next(pc->sg);
166 pc->b_count = 0;
167 }
168 }
169
170 if (bcount) {
171 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
172 drive->name, write ? "padding with zeros"
173 : "discarding data");
174 ide_pad_transfer(drive, write, bcount);
175 }
176 }
177
178 static void ide_scsi_hex_dump(u8 *data, int len)
179 {
180 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
181 }
182
183 static int idescsi_end_request(ide_drive_t *, int, int);
184
185 static void ide_scsi_callback(ide_drive_t *drive)
186 {
187 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
188 struct ide_atapi_pc *pc = scsi->pc;
189
190 if (pc->flags & PC_FLAG_TIMEDOUT)
191 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
192 pc->scsi_cmd->serial_number, jiffies);
193 /* end this request now - scsi should retry it*/
194 else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
195 printk(KERN_INFO "Packet command completed, %d bytes"
196 " transferred\n", pc->xferred);
197
198 idescsi_end_request(drive, 1, 0);
199 }
200
201 static int idescsi_check_condition(ide_drive_t *drive,
202 struct request *failed_cmd)
203 {
204 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
205 struct ide_atapi_pc *pc;
206 struct request *rq;
207 u8 *buf;
208
209 /* stuff a sense request in front of our current request */
210 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
211 rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
212 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
213 if (!pc || !rq || !buf) {
214 kfree(buf);
215 if (rq)
216 blk_put_request(rq);
217 kfree(pc);
218 return -ENOMEM;
219 }
220 rq->special = (char *) pc;
221 pc->rq = rq;
222 pc->buf = buf;
223 pc->c[0] = REQUEST_SENSE;
224 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
225 rq->cmd_type = REQ_TYPE_SENSE;
226 rq->cmd_flags |= REQ_PREEMPT;
227 pc->timeout = jiffies + WAIT_READY;
228 /* NOTE! Save the failed packet command in "rq->buffer" */
229 rq->buffer = (void *) failed_cmd->special;
230 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
231 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
232 printk ("ide-scsi: %s: queue cmd = ", drive->name);
233 ide_scsi_hex_dump(pc->c, 6);
234 }
235 rq->rq_disk = scsi->disk;
236 rq->ref_count++;
237 memcpy(rq->cmd, pc->c, 12);
238 ide_do_drive_cmd(drive, rq);
239 return 0;
240 }
241
242 static ide_startstop_t
243 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
244 {
245 ide_hwif_t *hwif = drive->hwif;
246
247 if (hwif->tp_ops->read_status(hwif) & (BUSY_STAT | DRQ_STAT))
248 /* force an abort */
249 hwif->tp_ops->exec_command(hwif, WIN_IDLEIMMEDIATE);
250
251 rq->errors++;
252
253 idescsi_end_request(drive, 0, 0);
254
255 return ide_stopped;
256 }
257
258 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
259 {
260 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
261 struct request *rq = HWGROUP(drive)->rq;
262 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
263 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
264 struct Scsi_Host *host;
265 int errors = rq->errors;
266 unsigned long flags;
267
268 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
269 ide_end_request(drive, uptodate, nrsecs);
270 return 0;
271 }
272 ide_end_drive_cmd (drive, 0, 0);
273 if (blk_sense_request(rq)) {
274 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
275 if (log) {
276 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
277 ide_scsi_hex_dump(pc->buf, 16);
278 }
279 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
280 SCSI_SENSE_BUFFERSIZE);
281 kfree(pc->buf);
282 kfree(pc);
283 blk_put_request(rq);
284 pc = opc;
285 rq = pc->rq;
286 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
287 (((pc->flags & PC_FLAG_TIMEDOUT) ?
288 DID_TIME_OUT :
289 DID_OK) << 16);
290 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
291 if (log)
292 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
293 drive->name, pc->scsi_cmd->serial_number);
294 pc->scsi_cmd->result = DID_TIME_OUT << 16;
295 } else if (errors >= ERROR_MAX) {
296 pc->scsi_cmd->result = DID_ERROR << 16;
297 if (log)
298 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
299 } else if (errors) {
300 if (log)
301 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
302 if (!idescsi_check_condition(drive, rq))
303 /* we started a request sense, so we'll be back, exit for now */
304 return 0;
305 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
306 } else {
307 pc->scsi_cmd->result = DID_OK << 16;
308 }
309 host = pc->scsi_cmd->device->host;
310 spin_lock_irqsave(host->host_lock, flags);
311 pc->done(pc->scsi_cmd);
312 spin_unlock_irqrestore(host->host_lock, flags);
313 kfree(pc);
314 blk_put_request(rq);
315 scsi->pc = NULL;
316 return 0;
317 }
318
319 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
320 {
321 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
322 }
323
324 static int idescsi_expiry(ide_drive_t *drive)
325 {
326 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
327 struct ide_atapi_pc *pc = scsi->pc;
328
329 debug_log("%s called for %lu at %lu\n", __func__,
330 pc->scsi_cmd->serial_number, jiffies);
331
332 pc->flags |= PC_FLAG_TIMEDOUT;
333
334 return 0; /* we do not want the ide subsystem to retry */
335 }
336
337 /*
338 * Our interrupt handler.
339 */
340 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
341 {
342 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
343 struct ide_atapi_pc *pc = scsi->pc;
344
345 return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
346 idescsi_expiry, NULL, NULL, NULL,
347 ide_scsi_io_buffers);
348 }
349
350 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
351 {
352 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
353
354 return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
355 get_timeout(scsi->pc), idescsi_expiry);
356 }
357
358 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
359 {
360 switch (pc->c[0]) {
361 case READ_6: case READ_10: case READ_12:
362 pc->flags &= ~PC_FLAG_WRITING;
363 return 0;
364 case WRITE_6: case WRITE_10: case WRITE_12:
365 pc->flags |= PC_FLAG_WRITING;
366 return 0;
367 default:
368 return 1;
369 }
370 }
371
372 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
373 {
374 ide_hwif_t *hwif = drive->hwif;
375 struct scatterlist *sg, *scsi_sg;
376 int segments;
377
378 if (!pc->req_xfer || pc->req_xfer % 1024)
379 return 1;
380
381 if (idescsi_set_direction(pc))
382 return 1;
383
384 sg = hwif->sg_table;
385 scsi_sg = scsi_sglist(pc->scsi_cmd);
386 segments = scsi_sg_count(pc->scsi_cmd);
387
388 if (segments > hwif->sg_max_nents)
389 return 1;
390
391 hwif->sg_nents = segments;
392 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
393
394 return 0;
395 }
396
397 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
398 struct ide_atapi_pc *pc)
399 {
400 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
401
402 /* Set the current packet command */
403 scsi->pc = pc;
404
405 return ide_issue_pc(drive, pc, idescsi_transfer_pc,
406 get_timeout(pc), idescsi_expiry);
407 }
408
409 /*
410 * idescsi_do_request is our request handling function.
411 */
412 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
413 {
414 debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
415 rq->cmd[0], rq->errors);
416 debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
417 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
418
419 if (blk_sense_request(rq) || blk_special_request(rq)) {
420 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
421
422 if (drive->using_dma && !idescsi_map_sg(drive, pc))
423 pc->flags |= PC_FLAG_DMA_OK;
424
425 return idescsi_issue_pc(drive, pc);
426 }
427 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
428 idescsi_end_request (drive, 0, 0);
429 return ide_stopped;
430 }
431
432 #ifdef CONFIG_IDE_PROC_FS
433 static void idescsi_add_settings(ide_drive_t *drive)
434 {
435 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
436
437 /*
438 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
439 */
440 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
441 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
442 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
443 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
444 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
445 }
446 #else
447 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
448 #endif
449
450 /*
451 * Driver initialization.
452 */
453 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
454 {
455 if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
456 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
457 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
458 #if IDESCSI_DEBUG_LOG
459 set_bit(IDESCSI_LOG_CMD, &scsi->log);
460 #endif /* IDESCSI_DEBUG_LOG */
461
462 drive->pc_callback = ide_scsi_callback;
463
464 idescsi_add_settings(drive);
465 }
466
467 static void ide_scsi_remove(ide_drive_t *drive)
468 {
469 struct Scsi_Host *scsihost = drive->driver_data;
470 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
471 struct gendisk *g = scsi->disk;
472
473 scsi_remove_host(scsihost);
474 ide_proc_unregister_driver(drive, scsi->driver);
475
476 ide_unregister_region(g);
477
478 drive->driver_data = NULL;
479 g->private_data = NULL;
480 put_disk(g);
481
482 ide_scsi_put(scsi);
483
484 drive->scsi = 0;
485 }
486
487 static int ide_scsi_probe(ide_drive_t *);
488
489 #ifdef CONFIG_IDE_PROC_FS
490 static ide_proc_entry_t idescsi_proc[] = {
491 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
492 { NULL, 0, NULL, NULL }
493 };
494 #endif
495
496 static ide_driver_t idescsi_driver = {
497 .gen_driver = {
498 .owner = THIS_MODULE,
499 .name = "ide-scsi",
500 .bus = &ide_bus_type,
501 },
502 .probe = ide_scsi_probe,
503 .remove = ide_scsi_remove,
504 .version = IDESCSI_VERSION,
505 .media = ide_scsi,
506 .supports_dsc_overlap = 0,
507 .do_request = idescsi_do_request,
508 .end_request = idescsi_end_request,
509 .error = idescsi_atapi_error,
510 #ifdef CONFIG_IDE_PROC_FS
511 .proc = idescsi_proc,
512 #endif
513 };
514
515 static int idescsi_ide_open(struct inode *inode, struct file *filp)
516 {
517 struct gendisk *disk = inode->i_bdev->bd_disk;
518 struct ide_scsi_obj *scsi;
519
520 if (!(scsi = ide_scsi_get(disk)))
521 return -ENXIO;
522
523 return 0;
524 }
525
526 static int idescsi_ide_release(struct inode *inode, struct file *filp)
527 {
528 struct gendisk *disk = inode->i_bdev->bd_disk;
529 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
530
531 ide_scsi_put(scsi);
532
533 return 0;
534 }
535
536 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
537 unsigned int cmd, unsigned long arg)
538 {
539 struct block_device *bdev = inode->i_bdev;
540 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
541 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
542 }
543
544 static struct block_device_operations idescsi_ops = {
545 .owner = THIS_MODULE,
546 .open = idescsi_ide_open,
547 .release = idescsi_ide_release,
548 .ioctl = idescsi_ide_ioctl,
549 };
550
551 static int idescsi_slave_configure(struct scsi_device * sdp)
552 {
553 /* Configure detected device */
554 sdp->use_10_for_rw = 1;
555 sdp->use_10_for_ms = 1;
556 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
557 return 0;
558 }
559
560 static const char *idescsi_info (struct Scsi_Host *host)
561 {
562 return "SCSI host adapter emulation for IDE ATAPI devices";
563 }
564
565 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
566 {
567 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
568
569 if (cmd == SG_SET_TRANSFORM) {
570 if (arg)
571 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
572 else
573 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
574 return 0;
575 } else if (cmd == SG_GET_TRANSFORM)
576 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
577 return -EINVAL;
578 }
579
580 static int idescsi_queue (struct scsi_cmnd *cmd,
581 void (*done)(struct scsi_cmnd *))
582 {
583 struct Scsi_Host *host = cmd->device->host;
584 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
585 ide_drive_t *drive = scsi->drive;
586 struct request *rq = NULL;
587 struct ide_atapi_pc *pc = NULL;
588 int write = cmd->sc_data_direction == DMA_TO_DEVICE;
589
590 if (!drive) {
591 scmd_printk (KERN_ERR, cmd, "drive not present\n");
592 goto abort;
593 }
594 scsi = drive_to_idescsi(drive);
595 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
596 rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
597 if (rq == NULL || pc == NULL) {
598 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
599 goto abort;
600 }
601
602 memset (pc->c, 0, 12);
603 pc->flags = 0;
604 if (cmd->sc_data_direction == DMA_TO_DEVICE)
605 pc->flags |= PC_FLAG_WRITING;
606 pc->rq = rq;
607 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
608 pc->buf = NULL;
609 pc->sg = scsi_sglist(cmd);
610 pc->sg_cnt = scsi_sg_count(cmd);
611 pc->b_count = 0;
612 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
613 pc->scsi_cmd = cmd;
614 pc->done = done;
615 pc->timeout = jiffies + cmd->request->timeout;
616
617 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
618 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
619 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
620 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
621 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
622 ide_scsi_hex_dump(pc->c, 12);
623 }
624 }
625
626 rq->special = (char *) pc;
627 rq->cmd_type = REQ_TYPE_SPECIAL;
628 spin_unlock_irq(host->host_lock);
629 rq->ref_count++;
630 memcpy(rq->cmd, pc->c, 12);
631 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
632 spin_lock_irq(host->host_lock);
633 return 0;
634 abort:
635 kfree (pc);
636 if (rq)
637 blk_put_request(rq);
638 cmd->result = DID_ERROR << 16;
639 done(cmd);
640 return 0;
641 }
642
643 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
644 {
645 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
646 ide_drive_t *drive = scsi->drive;
647 int busy;
648 int ret = FAILED;
649
650 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
651
652 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
653 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
654
655 if (!drive) {
656 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
657 WARN_ON(1);
658 goto no_drive;
659 }
660
661 /* First give it some more time, how much is "right" is hard to say :-( */
662
663 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
664 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
665 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
666
667 spin_lock_irq(&ide_lock);
668
669 /* If there is no pc running we're done (our interrupt took care of it) */
670 if (!scsi->pc) {
671 ret = SUCCESS;
672 goto ide_unlock;
673 }
674
675 /* It's somewhere in flight. Does ide subsystem agree? */
676 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
677 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
678 /*
679 * FIXME - not sure this condition can ever occur
680 */
681 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
682
683 if (blk_sense_request(scsi->pc->rq))
684 kfree(scsi->pc->buf);
685 /* we need to call blk_put_request twice. */
686 blk_put_request(scsi->pc->rq);
687 blk_put_request(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 blk_put_request(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 u16 last_lun;
815
816 if (!warned && drive->media == ide_cdrom) {
817 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
818 warned = 1;
819 }
820
821 if (idescsi_nocd && drive->media == ide_cdrom)
822 return -ENODEV;
823
824 if (!strstr("ide-scsi", drive->driver_req) ||
825 !drive->present ||
826 drive->media == ide_disk ||
827 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
828 return -ENODEV;
829
830 drive->scsi = 1;
831
832 g = alloc_disk(1 << PARTN_BITS);
833 if (!g)
834 goto out_host_put;
835
836 ide_init_disk(g, drive);
837
838 host->max_id = 1;
839
840 last_lun = drive->id[ATA_ID_LAST_LUN];
841 if (last_lun)
842 debug_log("%s: last_lun=%u\n", drive->name, last_lun);
843
844 if ((last_lun & 7) != 7)
845 host->max_lun = (last_lun & 7) + 1;
846 else
847 host->max_lun = 1;
848
849 drive->driver_data = host;
850 idescsi = scsihost_to_idescsi(host);
851 idescsi->drive = drive;
852 idescsi->driver = &idescsi_driver;
853 idescsi->host = host;
854 idescsi->disk = g;
855 g->private_data = &idescsi->driver;
856 ide_proc_register_driver(drive, &idescsi_driver);
857 err = 0;
858 idescsi_setup(drive, idescsi);
859 g->fops = &idescsi_ops;
860 ide_register_region(g);
861 err = scsi_add_host(host, &drive->gendev);
862 if (!err) {
863 scsi_scan_host(host);
864 return 0;
865 }
866 /* fall through on error */
867 ide_unregister_region(g);
868 ide_proc_unregister_driver(drive, &idescsi_driver);
869
870 put_disk(g);
871 out_host_put:
872 drive->scsi = 0;
873 scsi_host_put(host);
874 return err;
875 }
876
877 static int __init init_idescsi_module(void)
878 {
879 return driver_register(&idescsi_driver.gen_driver);
880 }
881
882 static void __exit exit_idescsi_module(void)
883 {
884 driver_unregister(&idescsi_driver.gen_driver);
885 }
886
887 module_param(idescsi_nocd, int, 0600);
888 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
889 module_init(init_idescsi_module);
890 module_exit(exit_idescsi_module);
891 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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