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ide: add ide_transfer_pc() helper
[deliverable/linux.git] / drivers / scsi / ide-scsi.c
1 /*
2 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
8 *
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
11 *
12 * Ver 0.1 Dec 3 96 Initial version.
13 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
14 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
15 * to Janos Farkas for pointing this out.
16 * Avoid using bitfields in structures for m68k.
17 * Added Scatter/Gather and DMA support.
18 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
19 * Use variable timeout for each command.
20 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
21 * Allow disabling of SCSI-6 to SCSI-10 transformation.
22 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
23 * for access through /dev/sg.
24 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
25 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
26 * detection of devices with CONFIG_SCSI_MULTI_LUN
27 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
28 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
29 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
30 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
31 */
32
33 #define IDESCSI_VERSION "0.92"
34
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/kernel.h>
39 #include <linux/mm.h>
40 #include <linux/ioport.h>
41 #include <linux/blkdev.h>
42 #include <linux/errno.h>
43 #include <linux/hdreg.h>
44 #include <linux/slab.h>
45 #include <linux/ide.h>
46 #include <linux/scatterlist.h>
47 #include <linux/delay.h>
48 #include <linux/mutex.h>
49 #include <linux/bitops.h>
50
51 #include <asm/io.h>
52 #include <asm/uaccess.h>
53
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_tcq.h>
59 #include <scsi/sg.h>
60
61 #define IDESCSI_DEBUG_LOG 0
62
63 #if IDESCSI_DEBUG_LOG
64 #define debug_log(fmt, args...) \
65 printk(KERN_INFO "ide-scsi: " fmt, ## args)
66 #else
67 #define debug_log(fmt, args...) do {} while (0)
68 #endif
69
70 /*
71 * SCSI command transformation layer
72 */
73 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
74
75 /*
76 * Log flags
77 */
78 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
79
80 typedef struct ide_scsi_obj {
81 ide_drive_t *drive;
82 ide_driver_t *driver;
83 struct gendisk *disk;
84 struct Scsi_Host *host;
85
86 struct ide_atapi_pc *pc; /* Current packet command */
87 unsigned long flags; /* Status/Action flags */
88 unsigned long transform; /* SCSI cmd translation layer */
89 unsigned long log; /* log flags */
90 } idescsi_scsi_t;
91
92 static DEFINE_MUTEX(idescsi_ref_mutex);
93 /* Set by module param to skip cd */
94 static int idescsi_nocd;
95
96 #define ide_scsi_g(disk) \
97 container_of((disk)->private_data, struct ide_scsi_obj, driver)
98
99 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
100 {
101 struct ide_scsi_obj *scsi = NULL;
102
103 mutex_lock(&idescsi_ref_mutex);
104 scsi = ide_scsi_g(disk);
105 if (scsi)
106 scsi_host_get(scsi->host);
107 mutex_unlock(&idescsi_ref_mutex);
108 return scsi;
109 }
110
111 static void ide_scsi_put(struct ide_scsi_obj *scsi)
112 {
113 mutex_lock(&idescsi_ref_mutex);
114 scsi_host_put(scsi->host);
115 mutex_unlock(&idescsi_ref_mutex);
116 }
117
118 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
119 {
120 return (idescsi_scsi_t*) (&host[1]);
121 }
122
123 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
124 {
125 return scsihost_to_idescsi(ide_drive->driver_data);
126 }
127
128 /*
129 * Per ATAPI device status bits.
130 */
131 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
132
133 /*
134 * ide-scsi requests.
135 */
136 #define IDESCSI_PC_RQ 90
137
138 /*
139 * PIO data transfer routine using the scatter gather table.
140 */
141 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
142 unsigned int bcount, int write)
143 {
144 ide_hwif_t *hwif = drive->hwif;
145 xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
146 char *buf;
147 int count;
148
149 while (bcount) {
150 count = min(pc->sg->length - pc->b_count, bcount);
151 if (PageHighMem(sg_page(pc->sg))) {
152 unsigned long flags;
153
154 local_irq_save(flags);
155 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
156 pc->sg->offset;
157 xf(drive, NULL, buf + pc->b_count, count);
158 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
159 local_irq_restore(flags);
160 } else {
161 buf = sg_virt(pc->sg);
162 xf(drive, NULL, buf + pc->b_count, count);
163 }
164 bcount -= count; pc->b_count += count;
165 if (pc->b_count == pc->sg->length) {
166 if (!--pc->sg_cnt)
167 break;
168 pc->sg = sg_next(pc->sg);
169 pc->b_count = 0;
170 }
171 }
172
173 if (bcount) {
174 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
175 drive->name, write ? "padding with zeros"
176 : "discarding data");
177 ide_pad_transfer(drive, write, bcount);
178 }
179 }
180
181 static void ide_scsi_hex_dump(u8 *data, int len)
182 {
183 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
184 }
185
186 static int idescsi_check_condition(ide_drive_t *drive,
187 struct request *failed_cmd)
188 {
189 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
190 struct ide_atapi_pc *pc;
191 struct request *rq;
192 u8 *buf;
193
194 /* stuff a sense request in front of our current request */
195 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
196 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
197 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
198 if (!pc || !rq || !buf) {
199 kfree(buf);
200 kfree(rq);
201 kfree(pc);
202 return -ENOMEM;
203 }
204 blk_rq_init(NULL, rq);
205 rq->special = (char *) pc;
206 pc->rq = rq;
207 pc->buf = buf;
208 pc->c[0] = REQUEST_SENSE;
209 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
210 rq->cmd_type = REQ_TYPE_SENSE;
211 rq->cmd_flags |= REQ_PREEMPT;
212 pc->timeout = jiffies + WAIT_READY;
213 /* NOTE! Save the failed packet command in "rq->buffer" */
214 rq->buffer = (void *) failed_cmd->special;
215 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
216 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
217 printk ("ide-scsi: %s: queue cmd = ", drive->name);
218 ide_scsi_hex_dump(pc->c, 6);
219 }
220 rq->rq_disk = scsi->disk;
221 ide_do_drive_cmd(drive, rq);
222 return 0;
223 }
224
225 static int idescsi_end_request(ide_drive_t *, int, int);
226
227 static ide_startstop_t
228 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
229 {
230 ide_hwif_t *hwif = drive->hwif;
231
232 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
233 /* force an abort */
234 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
235 hwif->io_ports.command_addr);
236
237 rq->errors++;
238
239 idescsi_end_request(drive, 0, 0);
240
241 return ide_stopped;
242 }
243
244 static ide_startstop_t
245 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
246 {
247 debug_log("%s called for %lu\n", __func__,
248 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
249
250 rq->errors |= ERROR_MAX;
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 kfree(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 kfree(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 ide_hwif_t *hwif = drive->hwif;
343 struct ide_atapi_pc *pc = scsi->pc;
344 struct request *rq = pc->rq;
345 xfer_func_t *xferfunc;
346 unsigned int temp;
347 u16 bcount;
348 u8 stat, ireason;
349
350 debug_log("Reached %s interrupt handler\n", __func__);
351
352 if (pc->flags & PC_FLAG_TIMEDOUT) {
353 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
354 pc->scsi_cmd->serial_number, jiffies);
355 /* end this request now - scsi should retry it*/
356 idescsi_end_request (drive, 1, 0);
357 return ide_stopped;
358 }
359 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
360 if (hwif->dma_ops->dma_end(drive))
361 pc->flags |= PC_FLAG_DMA_ERROR;
362 else
363 pc->xferred = pc->req_xfer;
364 debug_log("%s: DMA finished\n", drive->name);
365 }
366
367 /* Clear the interrupt */
368 stat = ide_read_status(drive);
369
370 if ((stat & DRQ_STAT) == 0) {
371 /* No more interrupts */
372 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
373 printk(KERN_INFO "Packet command completed, %d bytes"
374 " transferred\n", pc->xferred);
375 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
376 local_irq_enable_in_hardirq();
377 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
378 rq->errors++;
379 idescsi_end_request (drive, 1, 0);
380 return ide_stopped;
381 }
382 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
383 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
384 printk(KERN_ERR "%s: The device wants to issue more interrupts "
385 "in DMA mode\n", drive->name);
386 ide_dma_off(drive);
387 return ide_do_reset(drive);
388 }
389 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
390 hwif->INB(hwif->io_ports.lbam_addr);
391 ireason = hwif->INB(hwif->io_ports.nsect_addr);
392
393 if (ireason & CD) {
394 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
395 return ide_do_reset (drive);
396 }
397 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
398 /* Hopefully, we will never get here */
399 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
400 "to %s!\n", drive->name,
401 (ireason & IO) ? "Write" : "Read",
402 (ireason & IO) ? "Read" : "Write");
403 return ide_do_reset(drive);
404 }
405 if (!(pc->flags & PC_FLAG_WRITING)) {
406 temp = pc->xferred + bcount;
407 if (temp > pc->req_xfer) {
408 if (temp > pc->buf_size) {
409 printk(KERN_ERR "%s: The device wants to send "
410 "us more data than expected - "
411 "discarding data\n",
412 drive->name);
413 temp = pc->buf_size - pc->xferred;
414 if (temp) {
415 if (pc->sg)
416 ide_scsi_io_buffers(drive, pc,
417 temp, 0);
418 else
419 hwif->input_data(drive, NULL,
420 pc->cur_pos, temp);
421 printk(KERN_ERR "%s: transferred %d of "
422 "%d bytes\n",
423 drive->name,
424 temp, bcount);
425 }
426 pc->xferred += temp;
427 pc->cur_pos += temp;
428 ide_pad_transfer(drive, 0, bcount - temp);
429 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
430 return ide_started;
431 }
432 debug_log("The device wants to send us more data than "
433 "expected - allowing transfer\n");
434 }
435 xferfunc = hwif->input_data;
436 } else
437 xferfunc = hwif->output_data;
438
439 if (pc->sg)
440 ide_scsi_io_buffers(drive, pc, bcount,
441 !!(pc->flags & PC_FLAG_WRITING));
442 else
443 xferfunc(drive, NULL, pc->cur_pos, bcount);
444
445 /* Update the current position */
446 pc->xferred += bcount;
447 pc->cur_pos += bcount;
448
449 /* And set the interrupt handler again */
450 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
451 return ide_started;
452 }
453
454 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
455 {
456 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
457
458 return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
459 get_timeout(scsi->pc), idescsi_expiry);
460 }
461
462 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
463 {
464 switch (pc->c[0]) {
465 case READ_6: case READ_10: case READ_12:
466 pc->flags &= ~PC_FLAG_WRITING;
467 return 0;
468 case WRITE_6: case WRITE_10: case WRITE_12:
469 pc->flags |= PC_FLAG_WRITING;
470 return 0;
471 default:
472 return 1;
473 }
474 }
475
476 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
477 {
478 ide_hwif_t *hwif = drive->hwif;
479 struct scatterlist *sg, *scsi_sg;
480 int segments;
481
482 if (!pc->req_xfer || pc->req_xfer % 1024)
483 return 1;
484
485 if (idescsi_set_direction(pc))
486 return 1;
487
488 sg = hwif->sg_table;
489 scsi_sg = scsi_sglist(pc->scsi_cmd);
490 segments = scsi_sg_count(pc->scsi_cmd);
491
492 if (segments > hwif->sg_max_nents)
493 return 1;
494
495 hwif->sg_nents = segments;
496 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
497
498 return 0;
499 }
500
501 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
502 struct ide_atapi_pc *pc)
503 {
504 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
505 ide_hwif_t *hwif = drive->hwif;
506 u16 bcount;
507 u8 dma = 0;
508
509 /* Set the current packet command */
510 scsi->pc = pc;
511 /* We haven't transferred any data yet */
512 pc->xferred = 0;
513 pc->cur_pos = pc->buf;
514 /* Request to transfer the entire buffer at once */
515 bcount = min(pc->req_xfer, 63 * 1024);
516
517 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
518 hwif->sg_mapped = 1;
519 dma = !hwif->dma_ops->dma_setup(drive);
520 hwif->sg_mapped = 0;
521 }
522
523 ide_pktcmd_tf_load(drive, 0, bcount, dma);
524
525 if (dma)
526 pc->flags |= PC_FLAG_DMA_OK;
527
528 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
529 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
530 get_timeout(pc), idescsi_expiry);
531 return ide_started;
532 } else {
533 /* Issue the packet command */
534 ide_execute_pkt_cmd(drive);
535 return idescsi_transfer_pc(drive);
536 }
537 }
538
539 /*
540 * idescsi_do_request is our request handling function.
541 */
542 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
543 {
544 debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
545 rq->cmd[0], rq->errors);
546 debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
547 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
548
549 if (blk_sense_request(rq) || blk_special_request(rq)) {
550 return idescsi_issue_pc(drive,
551 (struct ide_atapi_pc *) rq->special);
552 }
553 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
554 idescsi_end_request (drive, 0, 0);
555 return ide_stopped;
556 }
557
558 #ifdef CONFIG_IDE_PROC_FS
559 static void idescsi_add_settings(ide_drive_t *drive)
560 {
561 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
562
563 /*
564 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
565 */
566 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
567 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
568 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
569 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
570 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
571 }
572 #else
573 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
574 #endif
575
576 /*
577 * Driver initialization.
578 */
579 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
580 {
581 if (drive->id && (drive->id->config & 0x0060) == 0x20)
582 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
583 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
584 #if IDESCSI_DEBUG_LOG
585 set_bit(IDESCSI_LOG_CMD, &scsi->log);
586 #endif /* IDESCSI_DEBUG_LOG */
587 idescsi_add_settings(drive);
588 }
589
590 static void ide_scsi_remove(ide_drive_t *drive)
591 {
592 struct Scsi_Host *scsihost = drive->driver_data;
593 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
594 struct gendisk *g = scsi->disk;
595
596 scsi_remove_host(scsihost);
597 ide_proc_unregister_driver(drive, scsi->driver);
598
599 ide_unregister_region(g);
600
601 drive->driver_data = NULL;
602 g->private_data = NULL;
603 put_disk(g);
604
605 ide_scsi_put(scsi);
606
607 drive->scsi = 0;
608 }
609
610 static int ide_scsi_probe(ide_drive_t *);
611
612 #ifdef CONFIG_IDE_PROC_FS
613 static ide_proc_entry_t idescsi_proc[] = {
614 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
615 { NULL, 0, NULL, NULL }
616 };
617 #endif
618
619 static ide_driver_t idescsi_driver = {
620 .gen_driver = {
621 .owner = THIS_MODULE,
622 .name = "ide-scsi",
623 .bus = &ide_bus_type,
624 },
625 .probe = ide_scsi_probe,
626 .remove = ide_scsi_remove,
627 .version = IDESCSI_VERSION,
628 .media = ide_scsi,
629 .supports_dsc_overlap = 0,
630 .do_request = idescsi_do_request,
631 .end_request = idescsi_end_request,
632 .error = idescsi_atapi_error,
633 .abort = idescsi_atapi_abort,
634 #ifdef CONFIG_IDE_PROC_FS
635 .proc = idescsi_proc,
636 #endif
637 };
638
639 static int idescsi_ide_open(struct inode *inode, struct file *filp)
640 {
641 struct gendisk *disk = inode->i_bdev->bd_disk;
642 struct ide_scsi_obj *scsi;
643
644 if (!(scsi = ide_scsi_get(disk)))
645 return -ENXIO;
646
647 return 0;
648 }
649
650 static int idescsi_ide_release(struct inode *inode, struct file *filp)
651 {
652 struct gendisk *disk = inode->i_bdev->bd_disk;
653 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
654
655 ide_scsi_put(scsi);
656
657 return 0;
658 }
659
660 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
661 unsigned int cmd, unsigned long arg)
662 {
663 struct block_device *bdev = inode->i_bdev;
664 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
665 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
666 }
667
668 static struct block_device_operations idescsi_ops = {
669 .owner = THIS_MODULE,
670 .open = idescsi_ide_open,
671 .release = idescsi_ide_release,
672 .ioctl = idescsi_ide_ioctl,
673 };
674
675 static int idescsi_slave_configure(struct scsi_device * sdp)
676 {
677 /* Configure detected device */
678 sdp->use_10_for_rw = 1;
679 sdp->use_10_for_ms = 1;
680 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
681 return 0;
682 }
683
684 static const char *idescsi_info (struct Scsi_Host *host)
685 {
686 return "SCSI host adapter emulation for IDE ATAPI devices";
687 }
688
689 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
690 {
691 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
692
693 if (cmd == SG_SET_TRANSFORM) {
694 if (arg)
695 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
696 else
697 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
698 return 0;
699 } else if (cmd == SG_GET_TRANSFORM)
700 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
701 return -EINVAL;
702 }
703
704 static int idescsi_queue (struct scsi_cmnd *cmd,
705 void (*done)(struct scsi_cmnd *))
706 {
707 struct Scsi_Host *host = cmd->device->host;
708 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
709 ide_drive_t *drive = scsi->drive;
710 struct request *rq = NULL;
711 struct ide_atapi_pc *pc = NULL;
712
713 if (!drive) {
714 scmd_printk (KERN_ERR, cmd, "drive not present\n");
715 goto abort;
716 }
717 scsi = drive_to_idescsi(drive);
718 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
719 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
720 if (rq == NULL || pc == NULL) {
721 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
722 goto abort;
723 }
724
725 memset (pc->c, 0, 12);
726 pc->flags = 0;
727 if (cmd->sc_data_direction == DMA_TO_DEVICE)
728 pc->flags |= PC_FLAG_WRITING;
729 pc->rq = rq;
730 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
731 pc->buf = NULL;
732 pc->sg = scsi_sglist(cmd);
733 pc->sg_cnt = scsi_sg_count(cmd);
734 pc->b_count = 0;
735 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
736 pc->scsi_cmd = cmd;
737 pc->done = done;
738 pc->timeout = jiffies + cmd->timeout_per_command;
739
740 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
741 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
742 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
743 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
744 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
745 ide_scsi_hex_dump(pc->c, 12);
746 }
747 }
748
749 blk_rq_init(NULL, rq);
750 rq->special = (char *) pc;
751 rq->cmd_type = REQ_TYPE_SPECIAL;
752 spin_unlock_irq(host->host_lock);
753 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
754 spin_lock_irq(host->host_lock);
755 return 0;
756 abort:
757 kfree (pc);
758 kfree (rq);
759 cmd->result = DID_ERROR << 16;
760 done(cmd);
761 return 0;
762 }
763
764 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
765 {
766 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
767 ide_drive_t *drive = scsi->drive;
768 int busy;
769 int ret = FAILED;
770
771 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
772
773 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
774 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
775
776 if (!drive) {
777 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
778 WARN_ON(1);
779 goto no_drive;
780 }
781
782 /* First give it some more time, how much is "right" is hard to say :-( */
783
784 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
785 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
786 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
787
788 spin_lock_irq(&ide_lock);
789
790 /* If there is no pc running we're done (our interrupt took care of it) */
791 if (!scsi->pc) {
792 ret = SUCCESS;
793 goto ide_unlock;
794 }
795
796 /* It's somewhere in flight. Does ide subsystem agree? */
797 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
798 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
799 /*
800 * FIXME - not sure this condition can ever occur
801 */
802 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
803
804 if (blk_sense_request(scsi->pc->rq))
805 kfree(scsi->pc->buf);
806 kfree(scsi->pc->rq);
807 kfree(scsi->pc);
808 scsi->pc = NULL;
809
810 ret = SUCCESS;
811 }
812
813 ide_unlock:
814 spin_unlock_irq(&ide_lock);
815 no_drive:
816 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
817 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
818
819 return ret;
820 }
821
822 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
823 {
824 struct request *req;
825 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
826 ide_drive_t *drive = scsi->drive;
827 int ready = 0;
828 int ret = SUCCESS;
829
830 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
831
832 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
833 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
834
835 if (!drive) {
836 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
837 WARN_ON(1);
838 return FAILED;
839 }
840
841 spin_lock_irq(cmd->device->host->host_lock);
842 spin_lock(&ide_lock);
843
844 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
845 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
846 spin_unlock(&ide_lock);
847 spin_unlock_irq(cmd->device->host->host_lock);
848 return FAILED;
849 }
850
851 /* kill current request */
852 if (__blk_end_request(req, -EIO, 0))
853 BUG();
854 if (blk_sense_request(req))
855 kfree(scsi->pc->buf);
856 kfree(scsi->pc);
857 scsi->pc = NULL;
858 kfree(req);
859
860 /* now nuke the drive queue */
861 while ((req = elv_next_request(drive->queue))) {
862 if (__blk_end_request(req, -EIO, 0))
863 BUG();
864 }
865
866 HWGROUP(drive)->rq = NULL;
867 HWGROUP(drive)->handler = NULL;
868 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
869 spin_unlock(&ide_lock);
870
871 ide_do_reset(drive);
872
873 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
874
875 do {
876 spin_unlock_irq(cmd->device->host->host_lock);
877 msleep(50);
878 spin_lock_irq(cmd->device->host->host_lock);
879 } while ( HWGROUP(drive)->handler );
880
881 ready = drive_is_ready(drive);
882 HWGROUP(drive)->busy--;
883 if (!ready) {
884 printk (KERN_ERR "ide-scsi: reset failed!\n");
885 ret = FAILED;
886 }
887
888 spin_unlock_irq(cmd->device->host->host_lock);
889 return ret;
890 }
891
892 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
893 sector_t capacity, int *parm)
894 {
895 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
896 ide_drive_t *drive = idescsi->drive;
897
898 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
899 parm[0] = drive->bios_head;
900 parm[1] = drive->bios_sect;
901 parm[2] = drive->bios_cyl;
902 }
903 return 0;
904 }
905
906 static struct scsi_host_template idescsi_template = {
907 .module = THIS_MODULE,
908 .name = "idescsi",
909 .info = idescsi_info,
910 .slave_configure = idescsi_slave_configure,
911 .ioctl = idescsi_ioctl,
912 .queuecommand = idescsi_queue,
913 .eh_abort_handler = idescsi_eh_abort,
914 .eh_host_reset_handler = idescsi_eh_reset,
915 .bios_param = idescsi_bios,
916 .can_queue = 40,
917 .this_id = -1,
918 .sg_tablesize = 256,
919 .cmd_per_lun = 5,
920 .max_sectors = 128,
921 .use_clustering = DISABLE_CLUSTERING,
922 .emulated = 1,
923 .proc_name = "ide-scsi",
924 };
925
926 static int ide_scsi_probe(ide_drive_t *drive)
927 {
928 idescsi_scsi_t *idescsi;
929 struct Scsi_Host *host;
930 struct gendisk *g;
931 static int warned;
932 int err = -ENOMEM;
933
934 if (!warned && drive->media == ide_cdrom) {
935 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
936 warned = 1;
937 }
938
939 if (idescsi_nocd && drive->media == ide_cdrom)
940 return -ENODEV;
941
942 if (!strstr("ide-scsi", drive->driver_req) ||
943 !drive->present ||
944 drive->media == ide_disk ||
945 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
946 return -ENODEV;
947
948 drive->scsi = 1;
949
950 g = alloc_disk(1 << PARTN_BITS);
951 if (!g)
952 goto out_host_put;
953
954 ide_init_disk(g, drive);
955
956 host->max_id = 1;
957
958 if (drive->id->last_lun)
959 debug_log("%s: id->last_lun=%u\n", drive->name,
960 drive->id->last_lun);
961
962 if ((drive->id->last_lun & 0x7) != 7)
963 host->max_lun = (drive->id->last_lun & 0x7) + 1;
964 else
965 host->max_lun = 1;
966
967 drive->driver_data = host;
968 idescsi = scsihost_to_idescsi(host);
969 idescsi->drive = drive;
970 idescsi->driver = &idescsi_driver;
971 idescsi->host = host;
972 idescsi->disk = g;
973 g->private_data = &idescsi->driver;
974 ide_proc_register_driver(drive, &idescsi_driver);
975 err = 0;
976 idescsi_setup(drive, idescsi);
977 g->fops = &idescsi_ops;
978 ide_register_region(g);
979 err = scsi_add_host(host, &drive->gendev);
980 if (!err) {
981 scsi_scan_host(host);
982 return 0;
983 }
984 /* fall through on error */
985 ide_unregister_region(g);
986 ide_proc_unregister_driver(drive, &idescsi_driver);
987
988 put_disk(g);
989 out_host_put:
990 drive->scsi = 0;
991 scsi_host_put(host);
992 return err;
993 }
994
995 static int __init init_idescsi_module(void)
996 {
997 return driver_register(&idescsi_driver.gen_driver);
998 }
999
1000 static void __exit exit_idescsi_module(void)
1001 {
1002 driver_unregister(&idescsi_driver.gen_driver);
1003 }
1004
1005 module_param(idescsi_nocd, int, 0600);
1006 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1007 module_init(init_idescsi_module);
1008 module_exit(exit_idescsi_module);
1009 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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