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