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ide-scsi: merge idescsi_input_buffers() and idescsi_output_buffers()
[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 /*
64 * SCSI command transformation layer
65 */
66 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
67
68 /*
69 * Log flags
70 */
71 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
72
73 typedef struct ide_scsi_obj {
74 ide_drive_t *drive;
75 ide_driver_t *driver;
76 struct gendisk *disk;
77 struct Scsi_Host *host;
78
79 struct ide_atapi_pc *pc; /* Current packet command */
80 unsigned long flags; /* Status/Action flags */
81 unsigned long transform; /* SCSI cmd translation layer */
82 unsigned long log; /* log flags */
83 } idescsi_scsi_t;
84
85 static DEFINE_MUTEX(idescsi_ref_mutex);
86 /* Set by module param to skip cd */
87 static int idescsi_nocd;
88
89 #define ide_scsi_g(disk) \
90 container_of((disk)->private_data, struct ide_scsi_obj, driver)
91
92 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
93 {
94 struct ide_scsi_obj *scsi = NULL;
95
96 mutex_lock(&idescsi_ref_mutex);
97 scsi = ide_scsi_g(disk);
98 if (scsi)
99 scsi_host_get(scsi->host);
100 mutex_unlock(&idescsi_ref_mutex);
101 return scsi;
102 }
103
104 static void ide_scsi_put(struct ide_scsi_obj *scsi)
105 {
106 mutex_lock(&idescsi_ref_mutex);
107 scsi_host_put(scsi->host);
108 mutex_unlock(&idescsi_ref_mutex);
109 }
110
111 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
112 {
113 return (idescsi_scsi_t*) (&host[1]);
114 }
115
116 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
117 {
118 return scsihost_to_idescsi(ide_drive->driver_data);
119 }
120
121 /*
122 * Per ATAPI device status bits.
123 */
124 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
125
126 /*
127 * ide-scsi requests.
128 */
129 #define IDESCSI_PC_RQ 90
130
131 /*
132 * PIO data transfer routine using the scatter gather table.
133 */
134 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
135 unsigned int bcount, int write)
136 {
137 ide_hwif_t *hwif = drive->hwif;
138 xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
139 char *buf;
140 int count;
141
142 while (bcount) {
143 count = min(pc->sg->length - pc->b_count, bcount);
144 if (PageHighMem(sg_page(pc->sg))) {
145 unsigned long flags;
146
147 local_irq_save(flags);
148 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
149 pc->sg->offset;
150 xf(drive, NULL, buf + pc->b_count, count);
151 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
152 local_irq_restore(flags);
153 } else {
154 buf = sg_virt(pc->sg);
155 xf(drive, NULL, buf + pc->b_count, count);
156 }
157 bcount -= count; pc->b_count += count;
158 if (pc->b_count == pc->sg->length) {
159 if (!--pc->sg_cnt)
160 break;
161 pc->sg = sg_next(pc->sg);
162 pc->b_count = 0;
163 }
164 }
165
166 if (bcount) {
167 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
168 drive->name, write ? "padding with zeros"
169 : "discarding data");
170 ide_pad_transfer(drive, write, bcount);
171 }
172 }
173
174 static void ide_scsi_hex_dump(u8 *data, int len)
175 {
176 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
177 }
178
179 static int idescsi_check_condition(ide_drive_t *drive,
180 struct request *failed_cmd)
181 {
182 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
183 struct ide_atapi_pc *pc;
184 struct request *rq;
185 u8 *buf;
186
187 /* stuff a sense request in front of our current request */
188 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
189 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
190 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
191 if (!pc || !rq || !buf) {
192 kfree(buf);
193 kfree(rq);
194 kfree(pc);
195 return -ENOMEM;
196 }
197 blk_rq_init(NULL, rq);
198 rq->special = (char *) pc;
199 pc->rq = rq;
200 pc->buf = buf;
201 pc->c[0] = REQUEST_SENSE;
202 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
203 rq->cmd_type = REQ_TYPE_SENSE;
204 rq->cmd_flags |= REQ_PREEMPT;
205 pc->timeout = jiffies + WAIT_READY;
206 /* NOTE! Save the failed packet command in "rq->buffer" */
207 rq->buffer = (void *) failed_cmd->special;
208 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
209 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
210 printk ("ide-scsi: %s: queue cmd = ", drive->name);
211 ide_scsi_hex_dump(pc->c, 6);
212 }
213 rq->rq_disk = scsi->disk;
214 ide_do_drive_cmd(drive, rq);
215 return 0;
216 }
217
218 static int idescsi_end_request(ide_drive_t *, int, int);
219
220 static ide_startstop_t
221 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
222 {
223 ide_hwif_t *hwif = drive->hwif;
224
225 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
226 /* force an abort */
227 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
228 hwif->io_ports.command_addr);
229
230 rq->errors++;
231
232 idescsi_end_request(drive, 0, 0);
233
234 return ide_stopped;
235 }
236
237 static ide_startstop_t
238 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
239 {
240 #if IDESCSI_DEBUG_LOG
241 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
242 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
243 #endif
244 rq->errors |= ERROR_MAX;
245
246 idescsi_end_request(drive, 0, 0);
247
248 return ide_stopped;
249 }
250
251 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
252 {
253 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
254 struct request *rq = HWGROUP(drive)->rq;
255 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
256 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
257 struct Scsi_Host *host;
258 int errors = rq->errors;
259 unsigned long flags;
260
261 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
262 ide_end_request(drive, uptodate, nrsecs);
263 return 0;
264 }
265 ide_end_drive_cmd (drive, 0, 0);
266 if (blk_sense_request(rq)) {
267 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
268 if (log) {
269 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
270 ide_scsi_hex_dump(pc->buf, 16);
271 }
272 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
273 SCSI_SENSE_BUFFERSIZE);
274 kfree(pc->buf);
275 kfree(pc);
276 kfree(rq);
277 pc = opc;
278 rq = pc->rq;
279 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
280 (((pc->flags & PC_FLAG_TIMEDOUT) ?
281 DID_TIME_OUT :
282 DID_OK) << 16);
283 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
284 if (log)
285 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
286 drive->name, pc->scsi_cmd->serial_number);
287 pc->scsi_cmd->result = DID_TIME_OUT << 16;
288 } else if (errors >= ERROR_MAX) {
289 pc->scsi_cmd->result = DID_ERROR << 16;
290 if (log)
291 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
292 } else if (errors) {
293 if (log)
294 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
295 if (!idescsi_check_condition(drive, rq))
296 /* we started a request sense, so we'll be back, exit for now */
297 return 0;
298 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
299 } else {
300 pc->scsi_cmd->result = DID_OK << 16;
301 }
302 host = pc->scsi_cmd->device->host;
303 spin_lock_irqsave(host->host_lock, flags);
304 pc->done(pc->scsi_cmd);
305 spin_unlock_irqrestore(host->host_lock, flags);
306 kfree(pc);
307 kfree(rq);
308 scsi->pc = NULL;
309 return 0;
310 }
311
312 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
313 {
314 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
315 }
316
317 static int idescsi_expiry(ide_drive_t *drive)
318 {
319 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
320 struct ide_atapi_pc *pc = scsi->pc;
321
322 #if IDESCSI_DEBUG_LOG
323 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
324 #endif
325 pc->flags |= PC_FLAG_TIMEDOUT;
326
327 return 0; /* we do not want the ide subsystem to retry */
328 }
329
330 /*
331 * Our interrupt handler.
332 */
333 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
334 {
335 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
336 ide_hwif_t *hwif = drive->hwif;
337 struct ide_atapi_pc *pc = scsi->pc;
338 struct request *rq = pc->rq;
339 xfer_func_t *xferfunc;
340 unsigned int temp;
341 u16 bcount;
342 u8 stat, ireason;
343
344 #if IDESCSI_DEBUG_LOG
345 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
346 #endif /* IDESCSI_DEBUG_LOG */
347
348 if (pc->flags & PC_FLAG_TIMEDOUT) {
349 #if IDESCSI_DEBUG_LOG
350 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
351 pc->scsi_cmd->serial_number, jiffies);
352 #endif
353 /* end this request now - scsi should retry it*/
354 idescsi_end_request (drive, 1, 0);
355 return ide_stopped;
356 }
357 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
358 if (hwif->dma_ops->dma_end(drive))
359 pc->flags |= PC_FLAG_DMA_ERROR;
360 else
361 pc->xferred = pc->req_xfer;
362 #if IDESCSI_DEBUG_LOG
363 printk ("ide-scsi: %s: DMA complete\n", drive->name);
364 #endif /* IDESCSI_DEBUG_LOG */
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 "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
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 "ide-scsi: The scsi wants to "
410 "send us more data than expected "
411 "- discarding data\n");
412 temp = pc->buf_size - pc->xferred;
413 if (temp) {
414 if (pc->sg)
415 ide_scsi_io_buffers(drive, pc,
416 temp, 0);
417 else
418 hwif->input_data(drive, NULL,
419 pc->cur_pos, temp);
420 printk(KERN_ERR "ide-scsi: transferred"
421 " %d of %d bytes\n",
422 temp, bcount);
423 }
424 pc->xferred += temp;
425 pc->cur_pos += temp;
426 ide_pad_transfer(drive, 0, bcount - temp);
427 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
428 return ide_started;
429 }
430 #if IDESCSI_DEBUG_LOG
431 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
432 #endif /* IDESCSI_DEBUG_LOG */
433 }
434 xferfunc = hwif->input_data;
435 } else
436 xferfunc = hwif->output_data;
437
438 if (pc->sg)
439 ide_scsi_io_buffers(drive, pc, bcount,
440 !!(pc->flags & PC_FLAG_WRITING));
441 else
442 xferfunc(drive, NULL, pc->cur_pos, bcount);
443
444 /* Update the current position */
445 pc->xferred += bcount;
446 pc->cur_pos += bcount;
447
448 /* And set the interrupt handler again */
449 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
450 return ide_started;
451 }
452
453 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
454 {
455 ide_hwif_t *hwif = drive->hwif;
456 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
457 struct ide_atapi_pc *pc = scsi->pc;
458 ide_startstop_t startstop;
459 u8 ireason;
460
461 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
462 printk(KERN_ERR "ide-scsi: Strange, packet command "
463 "initiated yet DRQ isn't asserted\n");
464 return startstop;
465 }
466 ireason = hwif->INB(hwif->io_ports.nsect_addr);
467 if ((ireason & CD) == 0 || (ireason & IO)) {
468 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
469 "issuing a packet command\n");
470 return ide_do_reset (drive);
471 }
472 BUG_ON(HWGROUP(drive)->handler != NULL);
473 /* Set the interrupt routine */
474 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
475
476 if (pc->flags & PC_FLAG_DMA_OK) {
477 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
478 hwif->dma_ops->dma_start(drive);
479 }
480
481 /* Send the actual packet */
482 hwif->output_data(drive, NULL, scsi->pc->c, 12);
483
484 return ide_started;
485 }
486
487 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
488 {
489 switch (pc->c[0]) {
490 case READ_6: case READ_10: case READ_12:
491 pc->flags &= ~PC_FLAG_WRITING;
492 return 0;
493 case WRITE_6: case WRITE_10: case WRITE_12:
494 pc->flags |= PC_FLAG_WRITING;
495 return 0;
496 default:
497 return 1;
498 }
499 }
500
501 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
502 {
503 ide_hwif_t *hwif = drive->hwif;
504 struct scatterlist *sg, *scsi_sg;
505 int segments;
506
507 if (!pc->req_xfer || pc->req_xfer % 1024)
508 return 1;
509
510 if (idescsi_set_direction(pc))
511 return 1;
512
513 sg = hwif->sg_table;
514 scsi_sg = scsi_sglist(pc->scsi_cmd);
515 segments = scsi_sg_count(pc->scsi_cmd);
516
517 if (segments > hwif->sg_max_nents)
518 return 1;
519
520 hwif->sg_nents = segments;
521 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
522
523 return 0;
524 }
525
526 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
527 struct ide_atapi_pc *pc)
528 {
529 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
530 ide_hwif_t *hwif = drive->hwif;
531 u16 bcount;
532 u8 dma = 0;
533
534 /* Set the current packet command */
535 scsi->pc = pc;
536 /* We haven't transferred any data yet */
537 pc->xferred = 0;
538 pc->cur_pos = pc->buf;
539 /* Request to transfer the entire buffer at once */
540 bcount = min(pc->req_xfer, 63 * 1024);
541
542 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
543 hwif->sg_mapped = 1;
544 dma = !hwif->dma_ops->dma_setup(drive);
545 hwif->sg_mapped = 0;
546 }
547
548 ide_pktcmd_tf_load(drive, 0, bcount, dma);
549
550 if (dma)
551 pc->flags |= PC_FLAG_DMA_OK;
552
553 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
554 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
555 get_timeout(pc), idescsi_expiry);
556 return ide_started;
557 } else {
558 /* Issue the packet command */
559 ide_execute_pkt_cmd(drive);
560 return idescsi_transfer_pc(drive);
561 }
562 }
563
564 /*
565 * idescsi_do_request is our request handling function.
566 */
567 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
568 {
569 #if IDESCSI_DEBUG_LOG
570 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
571 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
572 #endif /* IDESCSI_DEBUG_LOG */
573
574 if (blk_sense_request(rq) || blk_special_request(rq)) {
575 return idescsi_issue_pc(drive,
576 (struct ide_atapi_pc *) rq->special);
577 }
578 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
579 idescsi_end_request (drive, 0, 0);
580 return ide_stopped;
581 }
582
583 #ifdef CONFIG_IDE_PROC_FS
584 static void idescsi_add_settings(ide_drive_t *drive)
585 {
586 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
587
588 /*
589 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
590 */
591 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
592 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
593 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
594 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
595 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
596 }
597 #else
598 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
599 #endif
600
601 /*
602 * Driver initialization.
603 */
604 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
605 {
606 if (drive->id && (drive->id->config & 0x0060) == 0x20)
607 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
608 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
609 #if IDESCSI_DEBUG_LOG
610 set_bit(IDESCSI_LOG_CMD, &scsi->log);
611 #endif /* IDESCSI_DEBUG_LOG */
612 idescsi_add_settings(drive);
613 }
614
615 static void ide_scsi_remove(ide_drive_t *drive)
616 {
617 struct Scsi_Host *scsihost = drive->driver_data;
618 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
619 struct gendisk *g = scsi->disk;
620
621 scsi_remove_host(scsihost);
622 ide_proc_unregister_driver(drive, scsi->driver);
623
624 ide_unregister_region(g);
625
626 drive->driver_data = NULL;
627 g->private_data = NULL;
628 put_disk(g);
629
630 ide_scsi_put(scsi);
631 }
632
633 static int ide_scsi_probe(ide_drive_t *);
634
635 #ifdef CONFIG_IDE_PROC_FS
636 static ide_proc_entry_t idescsi_proc[] = {
637 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
638 { NULL, 0, NULL, NULL }
639 };
640 #endif
641
642 static ide_driver_t idescsi_driver = {
643 .gen_driver = {
644 .owner = THIS_MODULE,
645 .name = "ide-scsi",
646 .bus = &ide_bus_type,
647 },
648 .probe = ide_scsi_probe,
649 .remove = ide_scsi_remove,
650 .version = IDESCSI_VERSION,
651 .media = ide_scsi,
652 .supports_dsc_overlap = 0,
653 .do_request = idescsi_do_request,
654 .end_request = idescsi_end_request,
655 .error = idescsi_atapi_error,
656 .abort = idescsi_atapi_abort,
657 #ifdef CONFIG_IDE_PROC_FS
658 .proc = idescsi_proc,
659 #endif
660 };
661
662 static int idescsi_ide_open(struct inode *inode, struct file *filp)
663 {
664 struct gendisk *disk = inode->i_bdev->bd_disk;
665 struct ide_scsi_obj *scsi;
666
667 if (!(scsi = ide_scsi_get(disk)))
668 return -ENXIO;
669
670 return 0;
671 }
672
673 static int idescsi_ide_release(struct inode *inode, struct file *filp)
674 {
675 struct gendisk *disk = inode->i_bdev->bd_disk;
676 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
677
678 ide_scsi_put(scsi);
679
680 return 0;
681 }
682
683 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
684 unsigned int cmd, unsigned long arg)
685 {
686 struct block_device *bdev = inode->i_bdev;
687 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
688 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
689 }
690
691 static struct block_device_operations idescsi_ops = {
692 .owner = THIS_MODULE,
693 .open = idescsi_ide_open,
694 .release = idescsi_ide_release,
695 .ioctl = idescsi_ide_ioctl,
696 };
697
698 static int idescsi_slave_configure(struct scsi_device * sdp)
699 {
700 /* Configure detected device */
701 sdp->use_10_for_rw = 1;
702 sdp->use_10_for_ms = 1;
703 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
704 return 0;
705 }
706
707 static const char *idescsi_info (struct Scsi_Host *host)
708 {
709 return "SCSI host adapter emulation for IDE ATAPI devices";
710 }
711
712 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
713 {
714 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
715
716 if (cmd == SG_SET_TRANSFORM) {
717 if (arg)
718 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
719 else
720 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
721 return 0;
722 } else if (cmd == SG_GET_TRANSFORM)
723 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
724 return -EINVAL;
725 }
726
727 static int idescsi_queue (struct scsi_cmnd *cmd,
728 void (*done)(struct scsi_cmnd *))
729 {
730 struct Scsi_Host *host = cmd->device->host;
731 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
732 ide_drive_t *drive = scsi->drive;
733 struct request *rq = NULL;
734 struct ide_atapi_pc *pc = NULL;
735
736 if (!drive) {
737 scmd_printk (KERN_ERR, cmd, "drive not present\n");
738 goto abort;
739 }
740 scsi = drive_to_idescsi(drive);
741 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
742 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
743 if (rq == NULL || pc == NULL) {
744 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
745 goto abort;
746 }
747
748 memset (pc->c, 0, 12);
749 pc->flags = 0;
750 if (cmd->sc_data_direction == DMA_TO_DEVICE)
751 pc->flags |= PC_FLAG_WRITING;
752 pc->rq = rq;
753 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
754 pc->buf = NULL;
755 pc->sg = scsi_sglist(cmd);
756 pc->sg_cnt = scsi_sg_count(cmd);
757 pc->b_count = 0;
758 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
759 pc->scsi_cmd = cmd;
760 pc->done = done;
761 pc->timeout = jiffies + cmd->timeout_per_command;
762
763 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
764 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
765 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
766 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
767 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
768 ide_scsi_hex_dump(pc->c, 12);
769 }
770 }
771
772 blk_rq_init(NULL, rq);
773 rq->special = (char *) pc;
774 rq->cmd_type = REQ_TYPE_SPECIAL;
775 spin_unlock_irq(host->host_lock);
776 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
777 spin_lock_irq(host->host_lock);
778 return 0;
779 abort:
780 kfree (pc);
781 kfree (rq);
782 cmd->result = DID_ERROR << 16;
783 done(cmd);
784 return 0;
785 }
786
787 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
788 {
789 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
790 ide_drive_t *drive = scsi->drive;
791 int busy;
792 int ret = FAILED;
793
794 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
795
796 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
797 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
798
799 if (!drive) {
800 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
801 WARN_ON(1);
802 goto no_drive;
803 }
804
805 /* First give it some more time, how much is "right" is hard to say :-( */
806
807 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
808 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
809 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
810
811 spin_lock_irq(&ide_lock);
812
813 /* If there is no pc running we're done (our interrupt took care of it) */
814 if (!scsi->pc) {
815 ret = SUCCESS;
816 goto ide_unlock;
817 }
818
819 /* It's somewhere in flight. Does ide subsystem agree? */
820 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
821 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
822 /*
823 * FIXME - not sure this condition can ever occur
824 */
825 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
826
827 if (blk_sense_request(scsi->pc->rq))
828 kfree(scsi->pc->buf);
829 kfree(scsi->pc->rq);
830 kfree(scsi->pc);
831 scsi->pc = NULL;
832
833 ret = SUCCESS;
834 }
835
836 ide_unlock:
837 spin_unlock_irq(&ide_lock);
838 no_drive:
839 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
840 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
841
842 return ret;
843 }
844
845 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
846 {
847 struct request *req;
848 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
849 ide_drive_t *drive = scsi->drive;
850 int ready = 0;
851 int ret = SUCCESS;
852
853 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
854
855 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
856 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
857
858 if (!drive) {
859 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
860 WARN_ON(1);
861 return FAILED;
862 }
863
864 spin_lock_irq(cmd->device->host->host_lock);
865 spin_lock(&ide_lock);
866
867 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
868 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
869 spin_unlock(&ide_lock);
870 spin_unlock_irq(cmd->device->host->host_lock);
871 return FAILED;
872 }
873
874 /* kill current request */
875 if (__blk_end_request(req, -EIO, 0))
876 BUG();
877 if (blk_sense_request(req))
878 kfree(scsi->pc->buf);
879 kfree(scsi->pc);
880 scsi->pc = NULL;
881 kfree(req);
882
883 /* now nuke the drive queue */
884 while ((req = elv_next_request(drive->queue))) {
885 if (__blk_end_request(req, -EIO, 0))
886 BUG();
887 }
888
889 HWGROUP(drive)->rq = NULL;
890 HWGROUP(drive)->handler = NULL;
891 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
892 spin_unlock(&ide_lock);
893
894 ide_do_reset(drive);
895
896 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
897
898 do {
899 spin_unlock_irq(cmd->device->host->host_lock);
900 msleep(50);
901 spin_lock_irq(cmd->device->host->host_lock);
902 } while ( HWGROUP(drive)->handler );
903
904 ready = drive_is_ready(drive);
905 HWGROUP(drive)->busy--;
906 if (!ready) {
907 printk (KERN_ERR "ide-scsi: reset failed!\n");
908 ret = FAILED;
909 }
910
911 spin_unlock_irq(cmd->device->host->host_lock);
912 return ret;
913 }
914
915 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
916 sector_t capacity, int *parm)
917 {
918 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
919 ide_drive_t *drive = idescsi->drive;
920
921 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
922 parm[0] = drive->bios_head;
923 parm[1] = drive->bios_sect;
924 parm[2] = drive->bios_cyl;
925 }
926 return 0;
927 }
928
929 static struct scsi_host_template idescsi_template = {
930 .module = THIS_MODULE,
931 .name = "idescsi",
932 .info = idescsi_info,
933 .slave_configure = idescsi_slave_configure,
934 .ioctl = idescsi_ioctl,
935 .queuecommand = idescsi_queue,
936 .eh_abort_handler = idescsi_eh_abort,
937 .eh_host_reset_handler = idescsi_eh_reset,
938 .bios_param = idescsi_bios,
939 .can_queue = 40,
940 .this_id = -1,
941 .sg_tablesize = 256,
942 .cmd_per_lun = 5,
943 .max_sectors = 128,
944 .use_clustering = DISABLE_CLUSTERING,
945 .emulated = 1,
946 .proc_name = "ide-scsi",
947 };
948
949 static int ide_scsi_probe(ide_drive_t *drive)
950 {
951 idescsi_scsi_t *idescsi;
952 struct Scsi_Host *host;
953 struct gendisk *g;
954 static int warned;
955 int err = -ENOMEM;
956
957 if (!warned && drive->media == ide_cdrom) {
958 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
959 warned = 1;
960 }
961
962 if (idescsi_nocd && drive->media == ide_cdrom)
963 return -ENODEV;
964
965 if (!strstr("ide-scsi", drive->driver_req) ||
966 !drive->present ||
967 drive->media == ide_disk ||
968 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
969 return -ENODEV;
970
971 g = alloc_disk(1 << PARTN_BITS);
972 if (!g)
973 goto out_host_put;
974
975 ide_init_disk(g, drive);
976
977 host->max_id = 1;
978
979 #if IDESCSI_DEBUG_LOG
980 if (drive->id->last_lun)
981 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
982 #endif
983 if ((drive->id->last_lun & 0x7) != 7)
984 host->max_lun = (drive->id->last_lun & 0x7) + 1;
985 else
986 host->max_lun = 1;
987
988 drive->driver_data = host;
989 idescsi = scsihost_to_idescsi(host);
990 idescsi->drive = drive;
991 idescsi->driver = &idescsi_driver;
992 idescsi->host = host;
993 idescsi->disk = g;
994 g->private_data = &idescsi->driver;
995 ide_proc_register_driver(drive, &idescsi_driver);
996 err = 0;
997 idescsi_setup(drive, idescsi);
998 g->fops = &idescsi_ops;
999 ide_register_region(g);
1000 err = scsi_add_host(host, &drive->gendev);
1001 if (!err) {
1002 scsi_scan_host(host);
1003 return 0;
1004 }
1005 /* fall through on error */
1006 ide_unregister_region(g);
1007 ide_proc_unregister_driver(drive, &idescsi_driver);
1008
1009 put_disk(g);
1010 out_host_put:
1011 scsi_host_put(host);
1012 return err;
1013 }
1014
1015 static int __init init_idescsi_module(void)
1016 {
1017 return driver_register(&idescsi_driver.gen_driver);
1018 }
1019
1020 static void __exit exit_idescsi_module(void)
1021 {
1022 driver_unregister(&idescsi_driver.gen_driver);
1023 }
1024
1025 module_param(idescsi_nocd, int, 0600);
1026 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1027 module_init(init_idescsi_module);
1028 module_exit(exit_idescsi_module);
1029 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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