b4ba40436c4f933a5848c998e918633bf3ee20a2
[linux-2.6.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/slab.h>
44 #include <linux/ide.h>
45 #include <linux/scatterlist.h>
46 #include <linux/delay.h>
47 #include <linux/mutex.h>
48 #include <linux/bitops.h>
49
50 #include <asm/io.h>
51 #include <asm/uaccess.h>
52
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_host.h>
57 #include <scsi/scsi_tcq.h>
58 #include <scsi/sg.h>
59
60 #define IDESCSI_DEBUG_LOG               0
61
62 #if IDESCSI_DEBUG_LOG
63 #define debug_log(fmt, args...) \
64         printk(KERN_INFO "ide-scsi: " fmt, ## args)
65 #else
66 #define debug_log(fmt, args...) do {} while (0)
67 #endif
68
69 /*
70  *      SCSI command transformation layer
71  */
72 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
73
74 /*
75  *      Log flags
76  */
77 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
78
79 typedef struct ide_scsi_obj {
80         ide_drive_t             *drive;
81         ide_driver_t            *driver;
82         struct gendisk          *disk;
83         struct Scsi_Host        *host;
84
85         unsigned long transform;                /* SCSI cmd translation layer */
86         unsigned long log;                      /* log flags */
87 } idescsi_scsi_t;
88
89 static DEFINE_MUTEX(idescsi_ref_mutex);
90 /* Set by module param to skip cd */
91 static int idescsi_nocd;
92
93 #define ide_scsi_g(disk) \
94         container_of((disk)->private_data, struct ide_scsi_obj, driver)
95
96 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
97 {
98         struct ide_scsi_obj *scsi = NULL;
99
100         mutex_lock(&idescsi_ref_mutex);
101         scsi = ide_scsi_g(disk);
102         if (scsi) {
103                 if (ide_device_get(scsi->drive))
104                         scsi = NULL;
105                 else
106                         scsi_host_get(scsi->host);
107         }
108         mutex_unlock(&idescsi_ref_mutex);
109         return scsi;
110 }
111
112 static void ide_scsi_put(struct ide_scsi_obj *scsi)
113 {
114         ide_drive_t *drive = scsi->drive;
115
116         mutex_lock(&idescsi_ref_mutex);
117         scsi_host_put(scsi->host);
118         ide_device_put(drive);
119         mutex_unlock(&idescsi_ref_mutex);
120 }
121
122 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
123 {
124         return (idescsi_scsi_t*) (&host[1]);
125 }
126
127 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
128 {
129         return scsihost_to_idescsi(ide_drive->driver_data);
130 }
131
132 static void ide_scsi_hex_dump(u8 *data, int len)
133 {
134         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
135 }
136
137 static int idescsi_end_request(ide_drive_t *, int, int);
138
139 static void ide_scsi_callback(ide_drive_t *drive, int dsc)
140 {
141         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
142         struct ide_atapi_pc *pc = drive->pc;
143
144         if (pc->flags & PC_FLAG_TIMEDOUT)
145                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
146                           pc->scsi_cmd->serial_number, jiffies);
147                 /* end this request now - scsi should retry it*/
148         else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
149                 printk(KERN_INFO "Packet command completed, %d bytes"
150                                  " transferred\n", pc->xferred);
151
152         idescsi_end_request(drive, 1, 0);
153 }
154
155 static int idescsi_check_condition(ide_drive_t *drive,
156                 struct request *failed_cmd)
157 {
158         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
159         struct ide_atapi_pc   *pc;
160         struct request *rq;
161         u8             *buf;
162
163         /* stuff a sense request in front of our current request */
164         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
165         rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
166         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
167         if (!pc || !rq || !buf) {
168                 kfree(buf);
169                 if (rq)
170                         blk_put_request(rq);
171                 kfree(pc);
172                 return -ENOMEM;
173         }
174         rq->special = (char *) pc;
175         pc->rq = rq;
176         pc->buf = buf;
177         pc->c[0] = REQUEST_SENSE;
178         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
179         rq->cmd_type = REQ_TYPE_SENSE;
180         rq->cmd_flags |= REQ_PREEMPT;
181         pc->timeout = jiffies + WAIT_READY;
182         /* NOTE! Save the failed packet command in "rq->buffer" */
183         rq->buffer = (void *) failed_cmd->special;
184         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
185         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
186                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
187                 ide_scsi_hex_dump(pc->c, 6);
188         }
189         rq->rq_disk = scsi->disk;
190         rq->ref_count++;
191         memcpy(rq->cmd, pc->c, 12);
192         ide_do_drive_cmd(drive, rq);
193         return 0;
194 }
195
196 static ide_startstop_t
197 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
198 {
199         ide_hwif_t *hwif = drive->hwif;
200
201         if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
202                 /* force an abort */
203                 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
204
205         rq->errors++;
206
207         idescsi_end_request(drive, 0, 0);
208
209         return ide_stopped;
210 }
211
212 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
213 {
214         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
215         struct request *rq = HWGROUP(drive)->rq;
216         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
217         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
218         struct Scsi_Host *host;
219         int errors = rq->errors;
220         unsigned long flags;
221
222         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
223                 ide_end_request(drive, uptodate, nrsecs);
224                 return 0;
225         }
226         ide_end_drive_cmd (drive, 0, 0);
227         if (blk_sense_request(rq)) {
228                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
229                 if (log) {
230                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
231                         ide_scsi_hex_dump(pc->buf, 16);
232                 }
233                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
234                         SCSI_SENSE_BUFFERSIZE);
235                 kfree(pc->buf);
236                 kfree(pc);
237                 blk_put_request(rq);
238                 pc = opc;
239                 rq = pc->rq;
240                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
241                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
242                                   DID_TIME_OUT :
243                                   DID_OK) << 16);
244         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
245                 if (log)
246                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
247                                         drive->name, pc->scsi_cmd->serial_number);
248                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
249         } else if (errors >= ERROR_MAX) {
250                 pc->scsi_cmd->result = DID_ERROR << 16;
251                 if (log)
252                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
253         } else if (errors) {
254                 if (log)
255                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
256                 if (!idescsi_check_condition(drive, rq))
257                         /* we started a request sense, so we'll be back, exit for now */
258                         return 0;
259                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
260         } else {
261                 pc->scsi_cmd->result = DID_OK << 16;
262         }
263         host = pc->scsi_cmd->device->host;
264         spin_lock_irqsave(host->host_lock, flags);
265         pc->done(pc->scsi_cmd);
266         spin_unlock_irqrestore(host->host_lock, flags);
267         kfree(pc);
268         blk_put_request(rq);
269         drive->pc = NULL;
270         return 0;
271 }
272
273 /*
274  *      Our interrupt handler.
275  */
276 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
277 {
278         return ide_pc_intr(drive, idescsi_pc_intr);
279 }
280
281 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
282 {
283         return ide_transfer_pc(drive, idescsi_pc_intr,
284                                ide_scsi_get_timeout(drive->pc),
285                                ide_scsi_expiry);
286 }
287
288 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
289 {
290         switch (pc->c[0]) {
291                 case READ_6: case READ_10: case READ_12:
292                         pc->flags &= ~PC_FLAG_WRITING;
293                         return 0;
294                 case WRITE_6: case WRITE_10: case WRITE_12:
295                         pc->flags |= PC_FLAG_WRITING;
296                         return 0;
297                 default:
298                         return 1;
299         }
300 }
301
302 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
303 {
304         ide_hwif_t *hwif = drive->hwif;
305         struct scatterlist *sg, *scsi_sg;
306         int segments;
307
308         if (!pc->req_xfer || pc->req_xfer % 1024)
309                 return 1;
310
311         if (idescsi_set_direction(pc))
312                 return 1;
313
314         sg = hwif->sg_table;
315         scsi_sg = scsi_sglist(pc->scsi_cmd);
316         segments = scsi_sg_count(pc->scsi_cmd);
317
318         if (segments > hwif->sg_max_nents)
319                 return 1;
320
321         hwif->sg_nents = segments;
322         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
323
324         return 0;
325 }
326
327 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
328                 struct ide_atapi_pc *pc)
329 {
330         /* Set the current packet command */
331         drive->pc = pc;
332
333         return ide_issue_pc(drive, idescsi_transfer_pc,
334                             ide_scsi_get_timeout(pc), ide_scsi_expiry);
335 }
336
337 /*
338  *      idescsi_do_request is our request handling function.
339  */
340 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
341 {
342         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
343                   rq->cmd[0], rq->errors);
344         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
345                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
346
347         if (blk_sense_request(rq) || blk_special_request(rq)) {
348                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
349
350                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
351                         pc->flags |= PC_FLAG_DMA_OK;
352
353                 return idescsi_issue_pc(drive, pc);
354         }
355         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
356         idescsi_end_request (drive, 0, 0);
357         return ide_stopped;
358 }
359
360 #ifdef CONFIG_IDE_PROC_FS
361 #define ide_scsi_devset_get(name, field) \
362 static int get_##name(ide_drive_t *drive) \
363 { \
364         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
365         return scsi->field; \
366 }
367
368 #define ide_scsi_devset_set(name, field) \
369 static int set_##name(ide_drive_t *drive, int arg) \
370 { \
371         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
372         scsi->field = arg; \
373         return 0; \
374 }
375
376 #define ide_scsi_devset_rw_field(_name, _field) \
377 ide_scsi_devset_get(_name, _field); \
378 ide_scsi_devset_set(_name, _field); \
379 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name);
380
381 ide_devset_rw_field(bios_cyl, bios_cyl);
382 ide_devset_rw_field(bios_head, bios_head);
383 ide_devset_rw_field(bios_sect, bios_sect);
384
385 ide_scsi_devset_rw_field(transform, transform);
386 ide_scsi_devset_rw_field(log, log);
387
388 static const struct ide_proc_devset idescsi_settings[] = {
389         IDE_PROC_DEVSET(bios_cyl,  0, 1023),
390         IDE_PROC_DEVSET(bios_head, 0,  255),
391         IDE_PROC_DEVSET(bios_sect, 0,   63),
392         IDE_PROC_DEVSET(log,       0,    1),
393         IDE_PROC_DEVSET(transform, 0,    3),
394         { 0 },
395 };
396 #endif
397
398 /*
399  *      Driver initialization.
400  */
401 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
402 {
403         if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
404                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
405         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
406 #if IDESCSI_DEBUG_LOG
407         set_bit(IDESCSI_LOG_CMD, &scsi->log);
408 #endif /* IDESCSI_DEBUG_LOG */
409
410         drive->pc_callback       = ide_scsi_callback;
411         drive->pc_update_buffers = NULL;
412         drive->pc_io_buffers     = ide_io_buffers;
413
414         ide_proc_register_driver(drive, scsi->driver);
415 }
416
417 static void ide_scsi_remove(ide_drive_t *drive)
418 {
419         struct Scsi_Host *scsihost = drive->driver_data;
420         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
421         struct gendisk *g = scsi->disk;
422
423         scsi_remove_host(scsihost);
424         ide_proc_unregister_driver(drive, scsi->driver);
425
426         ide_unregister_region(g);
427
428         drive->driver_data = NULL;
429         g->private_data = NULL;
430         put_disk(g);
431
432         ide_scsi_put(scsi);
433
434         drive->scsi = 0;
435 }
436
437 static int ide_scsi_probe(ide_drive_t *);
438
439 #ifdef CONFIG_IDE_PROC_FS
440 static ide_proc_entry_t idescsi_proc[] = {
441         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
442         { NULL, 0, NULL, NULL }
443 };
444 #endif
445
446 static ide_driver_t idescsi_driver = {
447         .gen_driver = {
448                 .owner          = THIS_MODULE,
449                 .name           = "ide-scsi",
450                 .bus            = &ide_bus_type,
451         },
452         .probe                  = ide_scsi_probe,
453         .remove                 = ide_scsi_remove,
454         .version                = IDESCSI_VERSION,
455         .media                  = ide_scsi,
456         .do_request             = idescsi_do_request,
457         .end_request            = idescsi_end_request,
458         .error                  = idescsi_atapi_error,
459 #ifdef CONFIG_IDE_PROC_FS
460         .proc                   = idescsi_proc,
461         .settings               = idescsi_settings,
462 #endif
463 };
464
465 static int idescsi_ide_open(struct inode *inode, struct file *filp)
466 {
467         struct gendisk *disk = inode->i_bdev->bd_disk;
468         struct ide_scsi_obj *scsi;
469
470         if (!(scsi = ide_scsi_get(disk)))
471                 return -ENXIO;
472
473         return 0;
474 }
475
476 static int idescsi_ide_release(struct inode *inode, struct file *filp)
477 {
478         struct gendisk *disk = inode->i_bdev->bd_disk;
479         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
480
481         ide_scsi_put(scsi);
482
483         return 0;
484 }
485
486 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
487                         unsigned int cmd, unsigned long arg)
488 {
489         struct block_device *bdev = inode->i_bdev;
490         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
491         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
492 }
493
494 static struct block_device_operations idescsi_ops = {
495         .owner          = THIS_MODULE,
496         .open           = idescsi_ide_open,
497         .release        = idescsi_ide_release,
498         .ioctl          = idescsi_ide_ioctl,
499 };
500
501 static int idescsi_slave_configure(struct scsi_device * sdp)
502 {
503         /* Configure detected device */
504         sdp->use_10_for_rw = 1;
505         sdp->use_10_for_ms = 1;
506         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
507         return 0;
508 }
509
510 static const char *idescsi_info (struct Scsi_Host *host)
511 {
512         return "SCSI host adapter emulation for IDE ATAPI devices";
513 }
514
515 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
516 {
517         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
518
519         if (cmd == SG_SET_TRANSFORM) {
520                 if (arg)
521                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
522                 else
523                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
524                 return 0;
525         } else if (cmd == SG_GET_TRANSFORM)
526                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
527         return -EINVAL;
528 }
529
530 static int idescsi_queue (struct scsi_cmnd *cmd,
531                 void (*done)(struct scsi_cmnd *))
532 {
533         struct Scsi_Host *host = cmd->device->host;
534         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
535         ide_drive_t *drive = scsi->drive;
536         struct request *rq = NULL;
537         struct ide_atapi_pc *pc = NULL;
538         int write = cmd->sc_data_direction == DMA_TO_DEVICE;
539
540         if (!drive) {
541                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
542                 goto abort;
543         }
544         scsi = drive_to_idescsi(drive);
545         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
546         rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
547         if (rq == NULL || pc == NULL) {
548                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
549                 goto abort;
550         }
551
552         memset (pc->c, 0, 12);
553         pc->flags = 0;
554         if (cmd->sc_data_direction == DMA_TO_DEVICE)
555                 pc->flags |= PC_FLAG_WRITING;
556         pc->rq = rq;
557         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
558         pc->buf = NULL;
559         pc->sg = scsi_sglist(cmd);
560         pc->sg_cnt = scsi_sg_count(cmd);
561         pc->b_count = 0;
562         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
563         pc->scsi_cmd = cmd;
564         pc->done = done;
565         pc->timeout = jiffies + cmd->request->timeout;
566
567         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
568                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
569                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
570                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
571                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
572                         ide_scsi_hex_dump(pc->c, 12);
573                 }
574         }
575
576         rq->special = (char *) pc;
577         rq->cmd_type = REQ_TYPE_SPECIAL;
578         spin_unlock_irq(host->host_lock);
579         rq->ref_count++;
580         memcpy(rq->cmd, pc->c, 12);
581         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
582         spin_lock_irq(host->host_lock);
583         return 0;
584 abort:
585         kfree (pc);
586         if (rq)
587                 blk_put_request(rq);
588         cmd->result = DID_ERROR << 16;
589         done(cmd);
590         return 0;
591 }
592
593 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
594 {
595         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
596         ide_drive_t    *drive = scsi->drive;
597         int             busy;
598         int             ret   = FAILED;
599
600         struct ide_atapi_pc *pc;
601
602         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
603
604         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
605                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
606
607         if (!drive) {
608                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
609                 WARN_ON(1);
610                 goto no_drive;
611         }
612
613         /* First give it some more time, how much is "right" is hard to say :-( */
614
615         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
616         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
617                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
618
619         spin_lock_irq(&ide_lock);
620
621         /* If there is no pc running we're done (our interrupt took care of it) */
622         pc = drive->pc;
623         if (pc == NULL) {
624                 ret = SUCCESS;
625                 goto ide_unlock;
626         }
627
628         /* It's somewhere in flight. Does ide subsystem agree? */
629         if (pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
630             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != pc->rq) {
631                 /*
632                  * FIXME - not sure this condition can ever occur
633                  */
634                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
635
636                 if (blk_sense_request(pc->rq))
637                         kfree(pc->buf);
638                 /* we need to call blk_put_request twice. */
639                 blk_put_request(pc->rq);
640                 blk_put_request(pc->rq);
641                 kfree(pc);
642                 drive->pc = NULL;
643
644                 ret = SUCCESS;
645         }
646
647 ide_unlock:
648         spin_unlock_irq(&ide_lock);
649 no_drive:
650         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
651                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
652
653         return ret;
654 }
655
656 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
657 {
658         struct request *req;
659         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
660         ide_drive_t    *drive = scsi->drive;
661         int             ready = 0;
662         int             ret   = SUCCESS;
663
664         struct ide_atapi_pc *pc;
665
666         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
667
668         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
669                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
670
671         if (!drive) {
672                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
673                 WARN_ON(1);
674                 return FAILED;
675         }
676
677         spin_lock_irq(cmd->device->host->host_lock);
678         spin_lock(&ide_lock);
679
680         pc = drive->pc;
681
682         if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
683                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
684                 spin_unlock(&ide_lock);
685                 spin_unlock_irq(cmd->device->host->host_lock);
686                 return FAILED;
687         }
688
689         /* kill current request */
690         if (__blk_end_request(req, -EIO, 0))
691                 BUG();
692         if (blk_sense_request(req))
693                 kfree(pc->buf);
694         kfree(pc);
695         drive->pc = NULL;
696         blk_put_request(req);
697
698         /* now nuke the drive queue */
699         while ((req = elv_next_request(drive->queue))) {
700                 if (__blk_end_request(req, -EIO, 0))
701                         BUG();
702         }
703
704         HWGROUP(drive)->rq = NULL;
705         HWGROUP(drive)->handler = NULL;
706         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
707         spin_unlock(&ide_lock);
708
709         ide_do_reset(drive);
710
711         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
712
713         do {
714                 spin_unlock_irq(cmd->device->host->host_lock);
715                 msleep(50);
716                 spin_lock_irq(cmd->device->host->host_lock);
717         } while ( HWGROUP(drive)->handler );
718
719         ready = drive_is_ready(drive);
720         HWGROUP(drive)->busy--;
721         if (!ready) {
722                 printk (KERN_ERR "ide-scsi: reset failed!\n");
723                 ret = FAILED;
724         }
725
726         spin_unlock_irq(cmd->device->host->host_lock);
727         return ret;
728 }
729
730 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
731                 sector_t capacity, int *parm)
732 {
733         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
734         ide_drive_t *drive = idescsi->drive;
735
736         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
737                 parm[0] = drive->bios_head;
738                 parm[1] = drive->bios_sect;
739                 parm[2] = drive->bios_cyl;
740         }
741         return 0;
742 }
743
744 static struct scsi_host_template idescsi_template = {
745         .module                 = THIS_MODULE,
746         .name                   = "idescsi",
747         .info                   = idescsi_info,
748         .slave_configure        = idescsi_slave_configure,
749         .ioctl                  = idescsi_ioctl,
750         .queuecommand           = idescsi_queue,
751         .eh_abort_handler       = idescsi_eh_abort,
752         .eh_host_reset_handler  = idescsi_eh_reset,
753         .bios_param             = idescsi_bios,
754         .can_queue              = 40,
755         .this_id                = -1,
756         .sg_tablesize           = 256,
757         .cmd_per_lun            = 5,
758         .max_sectors            = 128,
759         .use_clustering         = DISABLE_CLUSTERING,
760         .emulated               = 1,
761         .proc_name              = "ide-scsi",
762 };
763
764 static int ide_scsi_probe(ide_drive_t *drive)
765 {
766         idescsi_scsi_t *idescsi;
767         struct Scsi_Host *host;
768         struct gendisk *g;
769         static int warned;
770         int err = -ENOMEM;
771         u16 last_lun;
772
773         if (!warned && drive->media == ide_cdrom) {
774                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
775                 warned = 1;
776         }
777
778         if (idescsi_nocd && drive->media == ide_cdrom)
779                 return -ENODEV;
780
781         if (!strstr("ide-scsi", drive->driver_req) ||
782             drive->media == ide_disk ||
783             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
784                 return -ENODEV;
785
786         drive->scsi = 1;
787
788         g = alloc_disk(1 << PARTN_BITS);
789         if (!g)
790                 goto out_host_put;
791
792         ide_init_disk(g, drive);
793
794         host->max_id = 1;
795
796         last_lun = drive->id[ATA_ID_LAST_LUN];
797         if (last_lun)
798                 debug_log("%s: last_lun=%u\n", drive->name, last_lun);
799
800         if ((last_lun & 7) != 7)
801                 host->max_lun = (last_lun & 7) + 1;
802         else
803                 host->max_lun = 1;
804
805         drive->driver_data = host;
806         idescsi = scsihost_to_idescsi(host);
807         idescsi->drive = drive;
808         idescsi->driver = &idescsi_driver;
809         idescsi->host = host;
810         idescsi->disk = g;
811         g->private_data = &idescsi->driver;
812         err = 0;
813         idescsi_setup(drive, idescsi);
814         g->fops = &idescsi_ops;
815         ide_register_region(g);
816         err = scsi_add_host(host, &drive->gendev);
817         if (!err) {
818                 scsi_scan_host(host);
819                 return 0;
820         }
821         /* fall through on error */
822         ide_unregister_region(g);
823         ide_proc_unregister_driver(drive, &idescsi_driver);
824
825         put_disk(g);
826 out_host_put:
827         drive->scsi = 0;
828         scsi_host_put(host);
829         return err;
830 }
831
832 static int __init init_idescsi_module(void)
833 {
834         return driver_register(&idescsi_driver.gen_driver);
835 }
836
837 static void __exit exit_idescsi_module(void)
838 {
839         driver_unregister(&idescsi_driver.gen_driver);
840 }
841
842 module_param(idescsi_nocd, int, 0600);
843 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
844 module_init(init_idescsi_module);
845 module_exit(exit_idescsi_module);
846 MODULE_LICENSE("GPL");