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memcg: clean up checking of the disabled flag
[linux-2.6/mini2440.git] / drivers / scsi / ide-scsi.c
blobb40a673985aa66fd2fe5310945b2993a0aa2feb2
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 scsi_host_get(scsi->host);
106 if (ide_device_get(scsi->drive)) {
107 scsi_host_put(scsi->host);
108 scsi = NULL;
109 }
110 }
111 mutex_unlock(&idescsi_ref_mutex);
112 return scsi;
113 }
114
115 static void ide_scsi_put(struct ide_scsi_obj *scsi)
116 {
117 mutex_lock(&idescsi_ref_mutex);
118 ide_device_put(scsi->drive);
119 scsi_host_put(scsi->host);
120 mutex_unlock(&idescsi_ref_mutex);
121 }
122
123 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
124 {
125 return (idescsi_scsi_t*) (&host[1]);
126 }
127
128 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
129 {
130 return scsihost_to_idescsi(ide_drive->driver_data);
131 }
132
133 /*
134 * PIO data transfer routine using the scatter gather table.
135 */
136 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
137 unsigned int bcount, int write)
138 {
139 ide_hwif_t *hwif = drive->hwif;
140 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
141 xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
142 char *buf;
143 int count;
144
145 while (bcount) {
146 count = min(pc->sg->length - pc->b_count, bcount);
147 if (PageHighMem(sg_page(pc->sg))) {
148 unsigned long flags;
149
150 local_irq_save(flags);
151 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
152 pc->sg->offset;
153 xf(drive, NULL, buf + pc->b_count, count);
154 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
155 local_irq_restore(flags);
156 } else {
157 buf = sg_virt(pc->sg);
158 xf(drive, NULL, buf + pc->b_count, count);
159 }
160 bcount -= count; pc->b_count += count;
161 if (pc->b_count == pc->sg->length) {
162 if (!--pc->sg_cnt)
163 break;
164 pc->sg = sg_next(pc->sg);
165 pc->b_count = 0;
166 }
167 }
168
169 if (bcount) {
170 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
171 drive->name, write ? "padding with zeros"
172 : "discarding data");
173 ide_pad_transfer(drive, write, bcount);
174 }
175 }
176
177 static void ide_scsi_hex_dump(u8 *data, int len)
178 {
179 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
180 }
181
182 static int idescsi_end_request(ide_drive_t *, int, int);
183
184 static void ide_scsi_callback(ide_drive_t *drive)
185 {
186 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
187 struct ide_atapi_pc *pc = scsi->pc;
188
189 if (pc->flags & PC_FLAG_TIMEDOUT)
190 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
191 pc->scsi_cmd->serial_number, jiffies);
192 /* end this request now - scsi should retry it*/
193 else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
194 printk(KERN_INFO "Packet command completed, %d bytes"
195 " transferred\n", pc->xferred);
196
197 idescsi_end_request(drive, 1, 0);
198 }
199
200 static int idescsi_check_condition(ide_drive_t *drive,
201 struct request *failed_cmd)
202 {
203 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
204 struct ide_atapi_pc *pc;
205 struct request *rq;
206 u8 *buf;
207
208 /* stuff a sense request in front of our current request */
209 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
210 rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
211 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
212 if (!pc || !rq || !buf) {
213 kfree(buf);
214 if (rq)
215 blk_put_request(rq);
216 kfree(pc);
217 return -ENOMEM;
218 }
219 rq->special = (char *) pc;
220 pc->rq = rq;
221 pc->buf = buf;
222 pc->c[0] = REQUEST_SENSE;
223 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
224 rq->cmd_type = REQ_TYPE_SENSE;
225 rq->cmd_flags |= REQ_PREEMPT;
226 pc->timeout = jiffies + WAIT_READY;
227 /* NOTE! Save the failed packet command in "rq->buffer" */
228 rq->buffer = (void *) failed_cmd->special;
229 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
230 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
231 printk ("ide-scsi: %s: queue cmd = ", drive->name);
232 ide_scsi_hex_dump(pc->c, 6);
233 }
234 rq->rq_disk = scsi->disk;
235 rq->ref_count++;
236 memcpy(rq->cmd, pc->c, 12);
237 ide_do_drive_cmd(drive, rq);
238 return 0;
239 }
240
241 static ide_startstop_t
242 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
243 {
244 ide_hwif_t *hwif = drive->hwif;
245
246 if (hwif->tp_ops->read_status(hwif) & (BUSY_STAT | DRQ_STAT))
247 /* force an abort */
248 hwif->tp_ops->exec_command(hwif, WIN_IDLEIMMEDIATE);
249
250 rq->errors++;
251
252 idescsi_end_request(drive, 0, 0);
253
254 return ide_stopped;
255 }
256
257 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
258 {
259 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
260 struct request *rq = HWGROUP(drive)->rq;
261 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
262 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
263 struct Scsi_Host *host;
264 int errors = rq->errors;
265 unsigned long flags;
266
267 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
268 ide_end_request(drive, uptodate, nrsecs);
269 return 0;
270 }
271 ide_end_drive_cmd (drive, 0, 0);
272 if (blk_sense_request(rq)) {
273 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
274 if (log) {
275 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
276 ide_scsi_hex_dump(pc->buf, 16);
277 }
278 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
279 SCSI_SENSE_BUFFERSIZE);
280 kfree(pc->buf);
281 kfree(pc);
282 blk_put_request(rq);
283 pc = opc;
284 rq = pc->rq;
285 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
286 (((pc->flags & PC_FLAG_TIMEDOUT) ?
287 DID_TIME_OUT :
288 DID_OK) << 16);
289 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
290 if (log)
291 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
292 drive->name, pc->scsi_cmd->serial_number);
293 pc->scsi_cmd->result = DID_TIME_OUT << 16;
294 } else if (errors >= ERROR_MAX) {
295 pc->scsi_cmd->result = DID_ERROR << 16;
296 if (log)
297 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
298 } else if (errors) {
299 if (log)
300 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
301 if (!idescsi_check_condition(drive, rq))
302 /* we started a request sense, so we'll be back, exit for now */
303 return 0;
304 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
305 } else {
306 pc->scsi_cmd->result = DID_OK << 16;
307 }
308 host = pc->scsi_cmd->device->host;
309 spin_lock_irqsave(host->host_lock, flags);
310 pc->done(pc->scsi_cmd);
311 spin_unlock_irqrestore(host->host_lock, flags);
312 kfree(pc);
313 blk_put_request(rq);
314 scsi->pc = NULL;
315 return 0;
316 }
317
318 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
319 {
320 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
321 }
322
323 static int idescsi_expiry(ide_drive_t *drive)
324 {
325 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
326 struct ide_atapi_pc *pc = scsi->pc;
327
328 debug_log("%s called for %lu at %lu\n", __func__,
329 pc->scsi_cmd->serial_number, jiffies);
330
331 pc->flags |= PC_FLAG_TIMEDOUT;
332
333 return 0; /* we do not want the ide subsystem to retry */
334 }
335
336 /*
337 * Our interrupt handler.
338 */
339 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
340 {
341 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
342 struct ide_atapi_pc *pc = scsi->pc;
343
344 return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
345 idescsi_expiry, NULL, NULL, NULL,
346 ide_scsi_io_buffers);
347 }
348
349 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
350 {
351 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
352
353 return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
354 get_timeout(scsi->pc), idescsi_expiry);
355 }
356
357 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
358 {
359 switch (pc->c[0]) {
360 case READ_6: case READ_10: case READ_12:
361 pc->flags &= ~PC_FLAG_WRITING;
362 return 0;
363 case WRITE_6: case WRITE_10: case WRITE_12:
364 pc->flags |= PC_FLAG_WRITING;
365 return 0;
366 default:
367 return 1;
368 }
369 }
370
371 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
372 {
373 ide_hwif_t *hwif = drive->hwif;
374 struct scatterlist *sg, *scsi_sg;
375 int segments;
376
377 if (!pc->req_xfer || pc->req_xfer % 1024)
378 return 1;
379
380 if (idescsi_set_direction(pc))
381 return 1;
382
383 sg = hwif->sg_table;
384 scsi_sg = scsi_sglist(pc->scsi_cmd);
385 segments = scsi_sg_count(pc->scsi_cmd);
386
387 if (segments > hwif->sg_max_nents)
388 return 1;
389
390 hwif->sg_nents = segments;
391 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
392
393 return 0;
394 }
395
396 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
397 struct ide_atapi_pc *pc)
398 {
399 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
400
401 /* Set the current packet command */
402 scsi->pc = pc;
403
404 return ide_issue_pc(drive, pc, idescsi_transfer_pc,
405 get_timeout(pc), idescsi_expiry);
406 }
407
408 /*
409 * idescsi_do_request is our request handling function.
410 */
411 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
412 {
413 debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
414 rq->cmd[0], rq->errors);
415 debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
416 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
417
418 if (blk_sense_request(rq) || blk_special_request(rq)) {
419 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
420
421 if (drive->using_dma && !idescsi_map_sg(drive, pc))
422 pc->flags |= PC_FLAG_DMA_OK;
423
424 return idescsi_issue_pc(drive, pc);
425 }
426 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
427 idescsi_end_request (drive, 0, 0);
428 return ide_stopped;
429 }
430
431 #ifdef CONFIG_IDE_PROC_FS
432 static void idescsi_add_settings(ide_drive_t *drive)
433 {
434 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
435
436 /*
437 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
438 */
439 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
440 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
441 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
442 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
443 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
444 }
445 #else
446 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
447 #endif
448
449 /*
450 * Driver initialization.
451 */
452 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
453 {
454 if (drive->id && (drive->id->config & 0x0060) == 0x20)
455 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
456 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
457 #if IDESCSI_DEBUG_LOG
458 set_bit(IDESCSI_LOG_CMD, &scsi->log);
459 #endif /* IDESCSI_DEBUG_LOG */
460
461 drive->pc_callback = ide_scsi_callback;
462
463 idescsi_add_settings(drive);
464 }
465
466 static void ide_scsi_remove(ide_drive_t *drive)
467 {
468 struct Scsi_Host *scsihost = drive->driver_data;
469 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
470 struct gendisk *g = scsi->disk;
471
472 scsi_remove_host(scsihost);
473 ide_proc_unregister_driver(drive, scsi->driver);
474
475 ide_unregister_region(g);
476
477 drive->driver_data = NULL;
478 g->private_data = NULL;
479 put_disk(g);
480
481 ide_scsi_put(scsi);
482
483 drive->scsi = 0;
484 }
485
486 static int ide_scsi_probe(ide_drive_t *);
487
488 #ifdef CONFIG_IDE_PROC_FS
489 static ide_proc_entry_t idescsi_proc[] = {
490 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
491 { NULL, 0, NULL, NULL }
492 };
493 #endif
494
495 static ide_driver_t idescsi_driver = {
496 .gen_driver = {
497 .owner = THIS_MODULE,
498 .name = "ide-scsi",
499 .bus = &ide_bus_type,
500 },
501 .probe = ide_scsi_probe,
502 .remove = ide_scsi_remove,
503 .version = IDESCSI_VERSION,
504 .media = ide_scsi,
505 .supports_dsc_overlap = 0,
506 .do_request = idescsi_do_request,
507 .end_request = idescsi_end_request,
508 .error = idescsi_atapi_error,
509 #ifdef CONFIG_IDE_PROC_FS
510 .proc = idescsi_proc,
511 #endif
512 };
513
514 static int idescsi_ide_open(struct inode *inode, struct file *filp)
515 {
516 struct gendisk *disk = inode->i_bdev->bd_disk;
517 struct ide_scsi_obj *scsi;
518
519 if (!(scsi = ide_scsi_get(disk)))
520 return -ENXIO;
521
522 return 0;
523 }
524
525 static int idescsi_ide_release(struct inode *inode, struct file *filp)
526 {
527 struct gendisk *disk = inode->i_bdev->bd_disk;
528 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
529
530 ide_scsi_put(scsi);
531
532 return 0;
533 }
534
535 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
536 unsigned int cmd, unsigned long arg)
537 {
538 struct block_device *bdev = inode->i_bdev;
539 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
540 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
541 }
542
543 static struct block_device_operations idescsi_ops = {
544 .owner = THIS_MODULE,
545 .open = idescsi_ide_open,
546 .release = idescsi_ide_release,
547 .ioctl = idescsi_ide_ioctl,
548 };
549
550 static int idescsi_slave_configure(struct scsi_device * sdp)
551 {
552 /* Configure detected device */
553 sdp->use_10_for_rw = 1;
554 sdp->use_10_for_ms = 1;
555 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
556 return 0;
557 }
558
559 static const char *idescsi_info (struct Scsi_Host *host)
560 {
561 return "SCSI host adapter emulation for IDE ATAPI devices";
562 }
563
564 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
565 {
566 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
567
568 if (cmd == SG_SET_TRANSFORM) {
569 if (arg)
570 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
571 else
572 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
573 return 0;
574 } else if (cmd == SG_GET_TRANSFORM)
575 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
576 return -EINVAL;
577 }
578
579 static int idescsi_queue (struct scsi_cmnd *cmd,
580 void (*done)(struct scsi_cmnd *))
581 {
582 struct Scsi_Host *host = cmd->device->host;
583 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
584 ide_drive_t *drive = scsi->drive;
585 struct request *rq = NULL;
586 struct ide_atapi_pc *pc = NULL;
587 int write = cmd->sc_data_direction == DMA_TO_DEVICE;
588
589 if (!drive) {
590 scmd_printk (KERN_ERR, cmd, "drive not present\n");
591 goto abort;
592 }
593 scsi = drive_to_idescsi(drive);
594 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
595 rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
596 if (rq == NULL || pc == NULL) {
597 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
598 goto abort;
599 }
600
601 memset (pc->c, 0, 12);
602 pc->flags = 0;
603 if (cmd->sc_data_direction == DMA_TO_DEVICE)
604 pc->flags |= PC_FLAG_WRITING;
605 pc->rq = rq;
606 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
607 pc->buf = NULL;
608 pc->sg = scsi_sglist(cmd);
609 pc->sg_cnt = scsi_sg_count(cmd);
610 pc->b_count = 0;
611 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
612 pc->scsi_cmd = cmd;
613 pc->done = done;
614 pc->timeout = jiffies + cmd->timeout_per_command;
615
616 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
617 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
618 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
619 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
620 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
621 ide_scsi_hex_dump(pc->c, 12);
622 }
623 }
624
625 rq->special = (char *) pc;
626 rq->cmd_type = REQ_TYPE_SPECIAL;
627 spin_unlock_irq(host->host_lock);
628 rq->ref_count++;
629 memcpy(rq->cmd, pc->c, 12);
630 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
631 spin_lock_irq(host->host_lock);
632 return 0;
633 abort:
634 kfree (pc);
635 if (rq)
636 blk_put_request(rq);
637 cmd->result = DID_ERROR << 16;
638 done(cmd);
639 return 0;
640 }
641
642 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
643 {
644 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
645 ide_drive_t *drive = scsi->drive;
646 int busy;
647 int ret = FAILED;
648
649 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
650
651 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
652 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
653
654 if (!drive) {
655 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
656 WARN_ON(1);
657 goto no_drive;
658 }
659
660 /* First give it some more time, how much is "right" is hard to say :-( */
661
662 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
663 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
664 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
665
666 spin_lock_irq(&ide_lock);
667
668 /* If there is no pc running we're done (our interrupt took care of it) */
669 if (!scsi->pc) {
670 ret = SUCCESS;
671 goto ide_unlock;
672 }
673
674 /* It's somewhere in flight. Does ide subsystem agree? */
675 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
676 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
677 /*
678 * FIXME - not sure this condition can ever occur
679 */
680 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
681
682 if (blk_sense_request(scsi->pc->rq))
683 kfree(scsi->pc->buf);
684 /* we need to call blk_put_request twice. */
685 blk_put_request(scsi->pc->rq);
686 blk_put_request(scsi->pc->rq);
687 kfree(scsi->pc);
688 scsi->pc = NULL;
689
690 ret = SUCCESS;
691 }
692
693 ide_unlock:
694 spin_unlock_irq(&ide_lock);
695 no_drive:
696 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
697 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
698
699 return ret;
700 }
701
702 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
703 {
704 struct request *req;
705 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
706 ide_drive_t *drive = scsi->drive;
707 int ready = 0;
708 int ret = SUCCESS;
709
710 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
711
712 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
713 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
714
715 if (!drive) {
716 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
717 WARN_ON(1);
718 return FAILED;
719 }
720
721 spin_lock_irq(cmd->device->host->host_lock);
722 spin_lock(&ide_lock);
723
724 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
725 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
726 spin_unlock(&ide_lock);
727 spin_unlock_irq(cmd->device->host->host_lock);
728 return FAILED;
729 }
730
731 /* kill current request */
732 if (__blk_end_request(req, -EIO, 0))
733 BUG();
734 if (blk_sense_request(req))
735 kfree(scsi->pc->buf);
736 kfree(scsi->pc);
737 scsi->pc = NULL;
738 blk_put_request(req);
739
740 /* now nuke the drive queue */
741 while ((req = elv_next_request(drive->queue))) {
742 if (__blk_end_request(req, -EIO, 0))
743 BUG();
744 }
745
746 HWGROUP(drive)->rq = NULL;
747 HWGROUP(drive)->handler = NULL;
748 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
749 spin_unlock(&ide_lock);
750
751 ide_do_reset(drive);
752
753 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
754
755 do {
756 spin_unlock_irq(cmd->device->host->host_lock);
757 msleep(50);
758 spin_lock_irq(cmd->device->host->host_lock);
759 } while ( HWGROUP(drive)->handler );
760
761 ready = drive_is_ready(drive);
762 HWGROUP(drive)->busy--;
763 if (!ready) {
764 printk (KERN_ERR "ide-scsi: reset failed!\n");
765 ret = FAILED;
766 }
767
768 spin_unlock_irq(cmd->device->host->host_lock);
769 return ret;
770 }
771
772 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
773 sector_t capacity, int *parm)
774 {
775 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
776 ide_drive_t *drive = idescsi->drive;
777
778 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
779 parm[0] = drive->bios_head;
780 parm[1] = drive->bios_sect;
781 parm[2] = drive->bios_cyl;
782 }
783 return 0;
784 }
785
786 static struct scsi_host_template idescsi_template = {
787 .module = THIS_MODULE,
788 .name = "idescsi",
789 .info = idescsi_info,
790 .slave_configure = idescsi_slave_configure,
791 .ioctl = idescsi_ioctl,
792 .queuecommand = idescsi_queue,
793 .eh_abort_handler = idescsi_eh_abort,
794 .eh_host_reset_handler = idescsi_eh_reset,
795 .bios_param = idescsi_bios,
796 .can_queue = 40,
797 .this_id = -1,
798 .sg_tablesize = 256,
799 .cmd_per_lun = 5,
800 .max_sectors = 128,
801 .use_clustering = DISABLE_CLUSTERING,
802 .emulated = 1,
803 .proc_name = "ide-scsi",
804 };
805
806 static int ide_scsi_probe(ide_drive_t *drive)
807 {
808 idescsi_scsi_t *idescsi;
809 struct Scsi_Host *host;
810 struct gendisk *g;
811 static int warned;
812 int err = -ENOMEM;
813
814 if (!warned && drive->media == ide_cdrom) {
815 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
816 warned = 1;
817 }
818
819 if (idescsi_nocd && drive->media == ide_cdrom)
820 return -ENODEV;
821
822 if (!strstr("ide-scsi", drive->driver_req) ||
823 !drive->present ||
824 drive->media == ide_disk ||
825 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
826 return -ENODEV;
827
828 drive->scsi = 1;
829
830 g = alloc_disk(1 << PARTN_BITS);
831 if (!g)
832 goto out_host_put;
833
834 ide_init_disk(g, drive);
835
836 host->max_id = 1;
837
838 if (drive->id->last_lun)
839 debug_log("%s: id->last_lun=%u\n", drive->name,
840 drive->id->last_lun);
841
842 if ((drive->id->last_lun & 0x7) != 7)
843 host->max_lun = (drive->id->last_lun & 0x7) + 1;
844 else
845 host->max_lun = 1;
846
847 drive->driver_data = host;
848 idescsi = scsihost_to_idescsi(host);
849 idescsi->drive = drive;
850 idescsi->driver = &idescsi_driver;
851 idescsi->host = host;
852 idescsi->disk = g;
853 g->private_data = &idescsi->driver;
854 ide_proc_register_driver(drive, &idescsi_driver);
855 err = 0;
856 idescsi_setup(drive, idescsi);
857 g->fops = &idescsi_ops;
858 ide_register_region(g);
859 err = scsi_add_host(host, &drive->gendev);
860 if (!err) {
861 scsi_scan_host(host);
862 return 0;
863 }
864 /* fall through on error */
865 ide_unregister_region(g);
866 ide_proc_unregister_driver(drive, &idescsi_driver);
867
868 put_disk(g);
869 out_host_put:
870 drive->scsi = 0;
871 scsi_host_put(host);
872 return err;
873 }
874
875 static int __init init_idescsi_module(void)
876 {
877 return driver_register(&idescsi_driver.gen_driver);
878 }
879
880 static void __exit exit_idescsi_module(void)
881 {
882 driver_unregister(&idescsi_driver.gen_driver);
883 }
884
885 module_param(idescsi_nocd, int, 0600);
886 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
887 module_init(init_idescsi_module);
888 module_exit(exit_idescsi_module);
889 MODULE_LICENSE("GPL");
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