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x86: add PAGE_KERNEL_EXEC_NOCACHE
[wrt350n-kernel.git] / drivers / scsi / ide-scsi.c
blobdb8bc20539e193f0b8ad9b1949d0214e5dcda64e
1 /*
2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
3 *
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5 */
6
7 /*
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 *
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
12 *
13 * Ver 0.1 Dec 3 96 Initial version.
14 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
15 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16 * to Janos Farkas for pointing this out.
17 * Avoid using bitfields in structures for m68k.
18 * Added Scatter/Gather and DMA support.
19 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
20 * Use variable timeout for each command.
21 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
22 * Allow disabling of SCSI-6 to SCSI-10 transformation.
23 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
24 * for access through /dev/sg.
25 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
27 * detection of devices with CONFIG_SCSI_MULTI_LUN
28 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
29 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
30 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
31 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
32 */
33
34 #define IDESCSI_VERSION "0.92"
35
36 #include <linux/module.h>
37 #include <linux/types.h>
38 #include <linux/string.h>
39 #include <linux/kernel.h>
40 #include <linux/mm.h>
41 #include <linux/ioport.h>
42 #include <linux/blkdev.h>
43 #include <linux/errno.h>
44 #include <linux/hdreg.h>
45 #include <linux/slab.h>
46 #include <linux/ide.h>
47 #include <linux/scatterlist.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/bitops.h>
51
52 #include <asm/io.h>
53 #include <asm/uaccess.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_tcq.h>
60 #include <scsi/sg.h>
61
62 #define IDESCSI_DEBUG_LOG 0
63
64 typedef struct idescsi_pc_s {
65 u8 c[12]; /* Actual packet bytes */
66 int request_transfer; /* Bytes to transfer */
67 int actually_transferred; /* Bytes actually transferred */
68 int buffer_size; /* Size of our data buffer */
69 struct request *rq; /* The corresponding request */
70 u8 *buffer; /* Data buffer */
71 u8 *current_position; /* Pointer into the above buffer */
72 struct scatterlist *sg; /* Scatter gather table */
73 unsigned int sg_cnt; /* Number of entries in sg */
74 int b_count; /* Bytes transferred from current entry */
75 struct scsi_cmnd *scsi_cmd; /* SCSI command */
76 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
77 unsigned long flags; /* Status/Action flags */
78 unsigned long timeout; /* Command timeout */
79 } idescsi_pc_t;
80
81 /*
82 * Packet command status bits.
83 */
84 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
85 #define PC_WRITING 1 /* Data direction */
86 #define PC_TIMEDOUT 3 /* command timed out */
87 #define PC_DMA_OK 4 /* Use DMA */
88
89 /*
90 * SCSI command transformation layer
91 */
92 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
93
94 /*
95 * Log flags
96 */
97 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
98
99 typedef struct ide_scsi_obj {
100 ide_drive_t *drive;
101 ide_driver_t *driver;
102 struct gendisk *disk;
103 struct Scsi_Host *host;
104
105 idescsi_pc_t *pc; /* Current packet command */
106 unsigned long flags; /* Status/Action flags */
107 unsigned long transform; /* SCSI cmd translation layer */
108 unsigned long log; /* log flags */
109 } idescsi_scsi_t;
110
111 static DEFINE_MUTEX(idescsi_ref_mutex);
112 static int idescsi_nocd; /* Set by module param to skip cd */
113
114 #define ide_scsi_g(disk) \
115 container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118 {
119 struct ide_scsi_obj *scsi = NULL;
120
121 mutex_lock(&idescsi_ref_mutex);
122 scsi = ide_scsi_g(disk);
123 if (scsi)
124 scsi_host_get(scsi->host);
125 mutex_unlock(&idescsi_ref_mutex);
126 return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131 mutex_lock(&idescsi_ref_mutex);
132 scsi_host_put(scsi->host);
133 mutex_unlock(&idescsi_ref_mutex);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138 return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143 return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147 * Per ATAPI device status bits.
148 */
149 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
150
151 /*
152 * ide-scsi requests.
153 */
154 #define IDESCSI_PC_RQ 90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158 while (bcount--)
159 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164 while (bcount--)
165 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169 * PIO data transfer routines using the scatter gather table.
170 */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173 int count;
174 char *buf;
175
176 while (bcount) {
177 count = min(pc->sg->length - pc->b_count, bcount);
178 if (PageHighMem(sg_page(pc->sg))) {
179 unsigned long flags;
180
181 local_irq_save(flags);
182 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
183 pc->sg->offset;
184 drive->hwif->atapi_input_bytes(drive,
185 buf + pc->b_count, count);
186 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
187 local_irq_restore(flags);
188 } else {
189 buf = sg_virt(pc->sg);
190 drive->hwif->atapi_input_bytes(drive,
191 buf + pc->b_count, count);
192 }
193 bcount -= count; pc->b_count += count;
194 if (pc->b_count == pc->sg->length) {
195 if (!--pc->sg_cnt)
196 break;
197 pc->sg = sg_next(pc->sg);
198 pc->b_count = 0;
199 }
200 }
201
202 if (bcount) {
203 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
204 idescsi_discard_data (drive, bcount);
205 }
206 }
207
208 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
209 {
210 int count;
211 char *buf;
212
213 while (bcount) {
214 count = min(pc->sg->length - pc->b_count, bcount);
215 if (PageHighMem(sg_page(pc->sg))) {
216 unsigned long flags;
217
218 local_irq_save(flags);
219 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
220 pc->sg->offset;
221 drive->hwif->atapi_output_bytes(drive,
222 buf + pc->b_count, count);
223 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
224 local_irq_restore(flags);
225 } else {
226 buf = sg_virt(pc->sg);
227 drive->hwif->atapi_output_bytes(drive,
228 buf + pc->b_count, count);
229 }
230 bcount -= count; pc->b_count += count;
231 if (pc->b_count == pc->sg->length) {
232 if (!--pc->sg_cnt)
233 break;
234 pc->sg = sg_next(pc->sg);
235 pc->b_count = 0;
236 }
237 }
238
239 if (bcount) {
240 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
241 idescsi_output_zeros (drive, bcount);
242 }
243 }
244
245 static void ide_scsi_hex_dump(u8 *data, int len)
246 {
247 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
248 }
249
250 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
251 {
252 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
253 idescsi_pc_t *pc;
254 struct request *rq;
255 u8 *buf;
256
257 /* stuff a sense request in front of our current request */
258 pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
259 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
260 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
261 if (!pc || !rq || !buf) {
262 kfree(buf);
263 kfree(rq);
264 kfree(pc);
265 return -ENOMEM;
266 }
267 ide_init_drive_cmd(rq);
268 rq->special = (char *) pc;
269 pc->rq = rq;
270 pc->buffer = buf;
271 pc->c[0] = REQUEST_SENSE;
272 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
273 rq->cmd_type = REQ_TYPE_SENSE;
274 pc->timeout = jiffies + WAIT_READY;
275 /* NOTE! Save the failed packet command in "rq->buffer" */
276 rq->buffer = (void *) failed_command->special;
277 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
278 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
279 printk ("ide-scsi: %s: queue cmd = ", drive->name);
280 ide_scsi_hex_dump(pc->c, 6);
281 }
282 rq->rq_disk = scsi->disk;
283 return ide_do_drive_cmd(drive, rq, ide_preempt);
284 }
285
286 static int idescsi_end_request(ide_drive_t *, int, int);
287
288 static ide_startstop_t
289 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
290 {
291 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
292 /* force an abort */
293 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
294
295 rq->errors++;
296
297 idescsi_end_request(drive, 0, 0);
298
299 return ide_stopped;
300 }
301
302 static ide_startstop_t
303 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
304 {
305 #if IDESCSI_DEBUG_LOG
306 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
307 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
308 #endif
309 rq->errors |= ERROR_MAX;
310
311 idescsi_end_request(drive, 0, 0);
312
313 return ide_stopped;
314 }
315
316 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
317 {
318 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
319 struct request *rq = HWGROUP(drive)->rq;
320 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
321 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
322 struct Scsi_Host *host;
323 int errors = rq->errors;
324 unsigned long flags;
325
326 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
327 ide_end_request(drive, uptodate, nrsecs);
328 return 0;
329 }
330 ide_end_drive_cmd (drive, 0, 0);
331 if (blk_sense_request(rq)) {
332 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
333 if (log) {
334 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
335 ide_scsi_hex_dump(pc->buffer, 16);
336 }
337 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
338 kfree(pc->buffer);
339 kfree(pc);
340 kfree(rq);
341 pc = opc;
342 rq = pc->rq;
343 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
344 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
345 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
346 if (log)
347 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
348 drive->name, pc->scsi_cmd->serial_number);
349 pc->scsi_cmd->result = DID_TIME_OUT << 16;
350 } else if (errors >= ERROR_MAX) {
351 pc->scsi_cmd->result = DID_ERROR << 16;
352 if (log)
353 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
354 } else if (errors) {
355 if (log)
356 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
357 if (!idescsi_check_condition(drive, rq))
358 /* we started a request sense, so we'll be back, exit for now */
359 return 0;
360 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
361 } else {
362 pc->scsi_cmd->result = DID_OK << 16;
363 }
364 host = pc->scsi_cmd->device->host;
365 spin_lock_irqsave(host->host_lock, flags);
366 pc->done(pc->scsi_cmd);
367 spin_unlock_irqrestore(host->host_lock, flags);
368 kfree(pc);
369 kfree(rq);
370 scsi->pc = NULL;
371 return 0;
372 }
373
374 static inline unsigned long get_timeout(idescsi_pc_t *pc)
375 {
376 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
377 }
378
379 static int idescsi_expiry(ide_drive_t *drive)
380 {
381 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
382 idescsi_pc_t *pc = scsi->pc;
383
384 #if IDESCSI_DEBUG_LOG
385 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
386 #endif
387 set_bit(PC_TIMEDOUT, &pc->flags);
388
389 return 0; /* we do not want the ide subsystem to retry */
390 }
391
392 /*
393 * Our interrupt handler.
394 */
395 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
396 {
397 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
398 ide_hwif_t *hwif = drive->hwif;
399 idescsi_pc_t *pc = scsi->pc;
400 struct request *rq = pc->rq;
401 unsigned int temp;
402 u16 bcount;
403 u8 stat, ireason;
404
405 #if IDESCSI_DEBUG_LOG
406 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
407 #endif /* IDESCSI_DEBUG_LOG */
408
409 if (test_bit(PC_TIMEDOUT, &pc->flags)){
410 #if IDESCSI_DEBUG_LOG
411 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
412 pc->scsi_cmd->serial_number, jiffies);
413 #endif
414 /* end this request now - scsi should retry it*/
415 idescsi_end_request (drive, 1, 0);
416 return ide_stopped;
417 }
418 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
419 #if IDESCSI_DEBUG_LOG
420 printk ("ide-scsi: %s: DMA complete\n", drive->name);
421 #endif /* IDESCSI_DEBUG_LOG */
422 pc->actually_transferred=pc->request_transfer;
423 (void) HWIF(drive)->ide_dma_end(drive);
424 }
425
426 /* Clear the interrupt */
427 stat = drive->hwif->INB(IDE_STATUS_REG);
428
429 if ((stat & DRQ_STAT) == 0) {
430 /* No more interrupts */
431 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
432 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
433 local_irq_enable_in_hardirq();
434 if (stat & ERR_STAT)
435 rq->errors++;
436 idescsi_end_request (drive, 1, 0);
437 return ide_stopped;
438 }
439 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
440 hwif->INB(IDE_BCOUNTL_REG);
441 ireason = hwif->INB(IDE_IREASON_REG);
442
443 if (ireason & CD) {
444 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
445 return ide_do_reset (drive);
446 }
447 if (ireason & IO) {
448 temp = pc->actually_transferred + bcount;
449 if (temp > pc->request_transfer) {
450 if (temp > pc->buffer_size) {
451 printk(KERN_ERR "ide-scsi: The scsi wants to "
452 "send us more data than expected "
453 "- discarding data\n");
454 temp = pc->buffer_size - pc->actually_transferred;
455 if (temp) {
456 clear_bit(PC_WRITING, &pc->flags);
457 if (pc->sg)
458 idescsi_input_buffers(drive, pc, temp);
459 else
460 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
461 printk(KERN_ERR "ide-scsi: transferred"
462 " %d of %d bytes\n",
463 temp, bcount);
464 }
465 pc->actually_transferred += temp;
466 pc->current_position += temp;
467 idescsi_discard_data(drive, bcount - temp);
468 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
469 return ide_started;
470 }
471 #if IDESCSI_DEBUG_LOG
472 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
473 #endif /* IDESCSI_DEBUG_LOG */
474 }
475 }
476 if (ireason & IO) {
477 clear_bit(PC_WRITING, &pc->flags);
478 if (pc->sg)
479 idescsi_input_buffers(drive, pc, bcount);
480 else
481 hwif->atapi_input_bytes(drive, pc->current_position,
482 bcount);
483 } else {
484 set_bit(PC_WRITING, &pc->flags);
485 if (pc->sg)
486 idescsi_output_buffers(drive, pc, bcount);
487 else
488 hwif->atapi_output_bytes(drive, pc->current_position,
489 bcount);
490 }
491 /* Update the current position */
492 pc->actually_transferred += bcount;
493 pc->current_position += bcount;
494
495 /* And set the interrupt handler again */
496 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
497 return ide_started;
498 }
499
500 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
501 {
502 ide_hwif_t *hwif = drive->hwif;
503 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
504 idescsi_pc_t *pc = scsi->pc;
505 ide_startstop_t startstop;
506 u8 ireason;
507
508 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
509 printk(KERN_ERR "ide-scsi: Strange, packet command "
510 "initiated yet DRQ isn't asserted\n");
511 return startstop;
512 }
513 ireason = hwif->INB(IDE_IREASON_REG);
514 if ((ireason & CD) == 0 || (ireason & IO)) {
515 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
516 "issuing a packet command\n");
517 return ide_do_reset (drive);
518 }
519 BUG_ON(HWGROUP(drive)->handler != NULL);
520 /* Set the interrupt routine */
521 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
522 /* Send the actual packet */
523 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
524 if (test_bit (PC_DMA_OK, &pc->flags)) {
525 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
526 hwif->dma_start(drive);
527 }
528 return ide_started;
529 }
530
531 static inline int idescsi_set_direction(idescsi_pc_t *pc)
532 {
533 switch (pc->c[0]) {
534 case READ_6: case READ_10: case READ_12:
535 clear_bit(PC_WRITING, &pc->flags);
536 return 0;
537 case WRITE_6: case WRITE_10: case WRITE_12:
538 set_bit(PC_WRITING, &pc->flags);
539 return 0;
540 default:
541 return 1;
542 }
543 }
544
545 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
546 {
547 ide_hwif_t *hwif = drive->hwif;
548 struct scatterlist *sg, *scsi_sg;
549 int segments;
550
551 if (!pc->request_transfer || pc->request_transfer % 1024)
552 return 1;
553
554 if (idescsi_set_direction(pc))
555 return 1;
556
557 sg = hwif->sg_table;
558 scsi_sg = scsi_sglist(pc->scsi_cmd);
559 segments = scsi_sg_count(pc->scsi_cmd);
560
561 if (segments > hwif->sg_max_nents)
562 return 1;
563
564 hwif->sg_nents = segments;
565 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
566
567 return 0;
568 }
569
570 /*
571 * Issue a packet command
572 */
573 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
574 {
575 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
576 ide_hwif_t *hwif = drive->hwif;
577 u16 bcount;
578 u8 dma = 0;
579
580 scsi->pc=pc; /* Set the current packet command */
581 pc->actually_transferred=0; /* We haven't transferred any data yet */
582 pc->current_position=pc->buffer;
583 /* Request to transfer the entire buffer at once */
584 bcount = min(pc->request_transfer, 63 * 1024);
585
586 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
587 hwif->sg_mapped = 1;
588 dma = !hwif->dma_setup(drive);
589 hwif->sg_mapped = 0;
590 }
591
592 SELECT_DRIVE(drive);
593
594 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
595
596 if (dma)
597 set_bit(PC_DMA_OK, &pc->flags);
598
599 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
600 BUG_ON(HWGROUP(drive)->handler != NULL);
601 ide_set_handler(drive, &idescsi_transfer_pc,
602 get_timeout(pc), idescsi_expiry);
603 /* Issue the packet command */
604 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
605 return ide_started;
606 } else {
607 /* Issue the packet command */
608 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
609 return idescsi_transfer_pc(drive);
610 }
611 }
612
613 /*
614 * idescsi_do_request is our request handling function.
615 */
616 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
617 {
618 #if IDESCSI_DEBUG_LOG
619 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
620 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
621 #endif /* IDESCSI_DEBUG_LOG */
622
623 if (blk_sense_request(rq) || blk_special_request(rq)) {
624 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
625 }
626 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
627 idescsi_end_request (drive, 0, 0);
628 return ide_stopped;
629 }
630
631 #ifdef CONFIG_IDE_PROC_FS
632 static void idescsi_add_settings(ide_drive_t *drive)
633 {
634 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
635
636 /*
637 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
638 */
639 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
640 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
641 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
642 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
643 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
644 }
645 #else
646 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
647 #endif
648
649 /*
650 * Driver initialization.
651 */
652 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
653 {
654 if (drive->id && (drive->id->config & 0x0060) == 0x20)
655 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
656 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
657 #if IDESCSI_DEBUG_LOG
658 set_bit(IDESCSI_LOG_CMD, &scsi->log);
659 #endif /* IDESCSI_DEBUG_LOG */
660 idescsi_add_settings(drive);
661 }
662
663 static void ide_scsi_remove(ide_drive_t *drive)
664 {
665 struct Scsi_Host *scsihost = drive->driver_data;
666 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
667 struct gendisk *g = scsi->disk;
668
669 scsi_remove_host(scsihost);
670 ide_proc_unregister_driver(drive, scsi->driver);
671
672 ide_unregister_region(g);
673
674 drive->driver_data = NULL;
675 g->private_data = NULL;
676 put_disk(g);
677
678 ide_scsi_put(scsi);
679 }
680
681 static int ide_scsi_probe(ide_drive_t *);
682
683 #ifdef CONFIG_IDE_PROC_FS
684 static ide_proc_entry_t idescsi_proc[] = {
685 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
686 { NULL, 0, NULL, NULL }
687 };
688 #endif
689
690 static ide_driver_t idescsi_driver = {
691 .gen_driver = {
692 .owner = THIS_MODULE,
693 .name = "ide-scsi",
694 .bus = &ide_bus_type,
695 },
696 .probe = ide_scsi_probe,
697 .remove = ide_scsi_remove,
698 .version = IDESCSI_VERSION,
699 .media = ide_scsi,
700 .supports_dsc_overlap = 0,
701 .do_request = idescsi_do_request,
702 .end_request = idescsi_end_request,
703 .error = idescsi_atapi_error,
704 .abort = idescsi_atapi_abort,
705 #ifdef CONFIG_IDE_PROC_FS
706 .proc = idescsi_proc,
707 #endif
708 };
709
710 static int idescsi_ide_open(struct inode *inode, struct file *filp)
711 {
712 struct gendisk *disk = inode->i_bdev->bd_disk;
713 struct ide_scsi_obj *scsi;
714
715 if (!(scsi = ide_scsi_get(disk)))
716 return -ENXIO;
717
718 return 0;
719 }
720
721 static int idescsi_ide_release(struct inode *inode, struct file *filp)
722 {
723 struct gendisk *disk = inode->i_bdev->bd_disk;
724 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
725
726 ide_scsi_put(scsi);
727
728 return 0;
729 }
730
731 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
732 unsigned int cmd, unsigned long arg)
733 {
734 struct block_device *bdev = inode->i_bdev;
735 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
736 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
737 }
738
739 static struct block_device_operations idescsi_ops = {
740 .owner = THIS_MODULE,
741 .open = idescsi_ide_open,
742 .release = idescsi_ide_release,
743 .ioctl = idescsi_ide_ioctl,
744 };
745
746 static int idescsi_slave_configure(struct scsi_device * sdp)
747 {
748 /* Configure detected device */
749 sdp->use_10_for_rw = 1;
750 sdp->use_10_for_ms = 1;
751 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
752 return 0;
753 }
754
755 static const char *idescsi_info (struct Scsi_Host *host)
756 {
757 return "SCSI host adapter emulation for IDE ATAPI devices";
758 }
759
760 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
761 {
762 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
763
764 if (cmd == SG_SET_TRANSFORM) {
765 if (arg)
766 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
767 else
768 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
769 return 0;
770 } else if (cmd == SG_GET_TRANSFORM)
771 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
772 return -EINVAL;
773 }
774
775 static int idescsi_queue (struct scsi_cmnd *cmd,
776 void (*done)(struct scsi_cmnd *))
777 {
778 struct Scsi_Host *host = cmd->device->host;
779 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
780 ide_drive_t *drive = scsi->drive;
781 struct request *rq = NULL;
782 idescsi_pc_t *pc = NULL;
783
784 if (!drive) {
785 scmd_printk (KERN_ERR, cmd, "drive not present\n");
786 goto abort;
787 }
788 scsi = drive_to_idescsi(drive);
789 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
790 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
791 if (rq == NULL || pc == NULL) {
792 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
793 goto abort;
794 }
795
796 memset (pc->c, 0, 12);
797 pc->flags = 0;
798 pc->rq = rq;
799 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
800 pc->buffer = NULL;
801 pc->sg = scsi_sglist(cmd);
802 pc->sg_cnt = scsi_sg_count(cmd);
803 pc->b_count = 0;
804 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
805 pc->scsi_cmd = cmd;
806 pc->done = done;
807 pc->timeout = jiffies + cmd->timeout_per_command;
808
809 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
810 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
811 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
812 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
813 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
814 ide_scsi_hex_dump(pc->c, 12);
815 }
816 }
817
818 ide_init_drive_cmd (rq);
819 rq->special = (char *) pc;
820 rq->cmd_type = REQ_TYPE_SPECIAL;
821 spin_unlock_irq(host->host_lock);
822 rq->rq_disk = scsi->disk;
823 (void) ide_do_drive_cmd (drive, rq, ide_end);
824 spin_lock_irq(host->host_lock);
825 return 0;
826 abort:
827 kfree (pc);
828 kfree (rq);
829 cmd->result = DID_ERROR << 16;
830 done(cmd);
831 return 0;
832 }
833
834 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
835 {
836 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
837 ide_drive_t *drive = scsi->drive;
838 int busy;
839 int ret = FAILED;
840
841 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
842
843 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
844 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
845
846 if (!drive) {
847 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
848 WARN_ON(1);
849 goto no_drive;
850 }
851
852 /* First give it some more time, how much is "right" is hard to say :-( */
853
854 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
855 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
856 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
857
858 spin_lock_irq(&ide_lock);
859
860 /* If there is no pc running we're done (our interrupt took care of it) */
861 if (!scsi->pc) {
862 ret = SUCCESS;
863 goto ide_unlock;
864 }
865
866 /* It's somewhere in flight. Does ide subsystem agree? */
867 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
868 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
869 /*
870 * FIXME - not sure this condition can ever occur
871 */
872 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
873
874 if (blk_sense_request(scsi->pc->rq))
875 kfree(scsi->pc->buffer);
876 kfree(scsi->pc->rq);
877 kfree(scsi->pc);
878 scsi->pc = NULL;
879
880 ret = SUCCESS;
881 }
882
883 ide_unlock:
884 spin_unlock_irq(&ide_lock);
885 no_drive:
886 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
887 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
888
889 return ret;
890 }
891
892 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
893 {
894 struct request *req;
895 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
896 ide_drive_t *drive = scsi->drive;
897 int ready = 0;
898 int ret = SUCCESS;
899
900 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
901
902 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
903 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
904
905 if (!drive) {
906 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
907 WARN_ON(1);
908 return FAILED;
909 }
910
911 spin_lock_irq(cmd->device->host->host_lock);
912 spin_lock(&ide_lock);
913
914 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
915 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
916 spin_unlock(&ide_lock);
917 spin_unlock_irq(cmd->device->host->host_lock);
918 return FAILED;
919 }
920
921 /* kill current request */
922 if (__blk_end_request(req, -EIO, 0))
923 BUG();
924 if (blk_sense_request(req))
925 kfree(scsi->pc->buffer);
926 kfree(scsi->pc);
927 scsi->pc = NULL;
928 kfree(req);
929
930 /* now nuke the drive queue */
931 while ((req = elv_next_request(drive->queue))) {
932 if (__blk_end_request(req, -EIO, 0))
933 BUG();
934 }
935
936 HWGROUP(drive)->rq = NULL;
937 HWGROUP(drive)->handler = NULL;
938 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
939 spin_unlock(&ide_lock);
940
941 ide_do_reset(drive);
942
943 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
944
945 do {
946 spin_unlock_irq(cmd->device->host->host_lock);
947 msleep(50);
948 spin_lock_irq(cmd->device->host->host_lock);
949 } while ( HWGROUP(drive)->handler );
950
951 ready = drive_is_ready(drive);
952 HWGROUP(drive)->busy--;
953 if (!ready) {
954 printk (KERN_ERR "ide-scsi: reset failed!\n");
955 ret = FAILED;
956 }
957
958 spin_unlock_irq(cmd->device->host->host_lock);
959 return ret;
960 }
961
962 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
963 sector_t capacity, int *parm)
964 {
965 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
966 ide_drive_t *drive = idescsi->drive;
967
968 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
969 parm[0] = drive->bios_head;
970 parm[1] = drive->bios_sect;
971 parm[2] = drive->bios_cyl;
972 }
973 return 0;
974 }
975
976 static struct scsi_host_template idescsi_template = {
977 .module = THIS_MODULE,
978 .name = "idescsi",
979 .info = idescsi_info,
980 .slave_configure = idescsi_slave_configure,
981 .ioctl = idescsi_ioctl,
982 .queuecommand = idescsi_queue,
983 .eh_abort_handler = idescsi_eh_abort,
984 .eh_host_reset_handler = idescsi_eh_reset,
985 .bios_param = idescsi_bios,
986 .can_queue = 40,
987 .this_id = -1,
988 .sg_tablesize = 256,
989 .cmd_per_lun = 5,
990 .max_sectors = 128,
991 .use_clustering = DISABLE_CLUSTERING,
992 .emulated = 1,
993 .proc_name = "ide-scsi",
994 };
995
996 static int ide_scsi_probe(ide_drive_t *drive)
997 {
998 idescsi_scsi_t *idescsi;
999 struct Scsi_Host *host;
1000 struct gendisk *g;
1001 static int warned;
1002 int err = -ENOMEM;
1003
1004 if (!warned && drive->media == ide_cdrom) {
1005 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1006 warned = 1;
1007 }
1008
1009 if (idescsi_nocd && drive->media == ide_cdrom)
1010 return -ENODEV;
1011
1012 if (!strstr("ide-scsi", drive->driver_req) ||
1013 !drive->present ||
1014 drive->media == ide_disk ||
1015 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1016 return -ENODEV;
1017
1018 g = alloc_disk(1 << PARTN_BITS);
1019 if (!g)
1020 goto out_host_put;
1021
1022 ide_init_disk(g, drive);
1023
1024 host->max_id = 1;
1025
1026 #if IDESCSI_DEBUG_LOG
1027 if (drive->id->last_lun)
1028 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1029 #endif
1030 if ((drive->id->last_lun & 0x7) != 7)
1031 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1032 else
1033 host->max_lun = 1;
1034
1035 drive->driver_data = host;
1036 idescsi = scsihost_to_idescsi(host);
1037 idescsi->drive = drive;
1038 idescsi->driver = &idescsi_driver;
1039 idescsi->host = host;
1040 idescsi->disk = g;
1041 g->private_data = &idescsi->driver;
1042 ide_proc_register_driver(drive, &idescsi_driver);
1043 err = 0;
1044 idescsi_setup(drive, idescsi);
1045 g->fops = &idescsi_ops;
1046 ide_register_region(g);
1047 err = scsi_add_host(host, &drive->gendev);
1048 if (!err) {
1049 scsi_scan_host(host);
1050 return 0;
1051 }
1052 /* fall through on error */
1053 ide_unregister_region(g);
1054 ide_proc_unregister_driver(drive, &idescsi_driver);
1055
1056 put_disk(g);
1057 out_host_put:
1058 scsi_host_put(host);
1059 return err;
1060 }
1061
1062 static int __init init_idescsi_module(void)
1063 {
1064 return driver_register(&idescsi_driver.gen_driver);
1065 }
1066
1067 static void __exit exit_idescsi_module(void)
1068 {
1069 driver_unregister(&idescsi_driver.gen_driver);
1070 }
1071
1072 module_param(idescsi_nocd, int, 0600);
1073 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1074 module_init(init_idescsi_module);
1075 module_exit(exit_idescsi_module);
1076 MODULE_LICENSE("GPL");
WRT350N Kernel Patches