File: /usr/src/linux/drivers/scsi/scsi_obsolete.c
1 /*
2 * scsi_obsolete.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995 Eric Youngdale
4 *
5 * generic mid-level SCSI driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 *
9 * <drew@colorado.edu>
10 *
11 * Bug correction thanks go to :
12 * Rik Faith <faith@cs.unc.edu>
13 * Tommy Thorn <tthorn>
14 * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de>
15 *
16 * Modified by Eric Youngdale eric@andante.org to
17 * add scatter-gather, multiple outstanding request, and other
18 * enhancements.
19 *
20 * Native multichannel, wide scsi, /proc/scsi and hot plugging
21 * support added by Michael Neuffer <mike@i-connect.net>
22 *
23 * Major improvements to the timeout, abort, and reset processing,
24 * as well as performance modifications for large queue depths by
25 * Leonard N. Zubkoff <lnz@dandelion.com>
26 *
27 * Improved compatibility with 2.0 behaviour by Manfred Spraul
28 * <masp0008@stud.uni-sb.de>
29 */
30
31 /*
32 *#########################################################################
33 *#########################################################################
34 *#########################################################################
35 *#########################################################################
36 * NOTE - NOTE - NOTE - NOTE - NOTE - NOTE - NOTE
37 *
38 *#########################################################################
39 *#########################################################################
40 *#########################################################################
41 *#########################################################################
42 *
43 * This file contains the 'old' scsi error handling. It is only present
44 * while the new error handling code is being debugged, and while the low
45 * level drivers are being converted to use the new code. Once the last
46 * driver uses the new code this *ENTIRE* file will be nuked.
47 */
48
49 #define __NO_VERSION__
50 #include <linux/module.h>
51
52 #include <linux/sched.h>
53 #include <linux/timer.h>
54 #include <linux/string.h>
55 #include <linux/slab.h>
56 #include <linux/ioport.h>
57 #include <linux/kernel.h>
58 #include <linux/stat.h>
59 #include <linux/blk.h>
60 #include <linux/interrupt.h>
61 #include <linux/delay.h>
62
63 #include <asm/system.h>
64 #include <asm/irq.h>
65 #include <asm/dma.h>
66
67 #include "scsi.h"
68 #include "hosts.h"
69 #include "constants.h"
70
71 #undef USE_STATIC_SCSI_MEMORY
72
73 /*
74 static const char RCSid[] = "$Header: /mnt/ide/home/eric/CVSROOT/linux/drivers/scsi/scsi_obsolete.c,v 1.1 1997/05/18 23:27:21 eric Exp $";
75 */
76
77
78 #define INTERNAL_ERROR (panic ("Internal error in file %s, line %d.\n", __FILE__, __LINE__))
79
80
81 static int scsi_abort(Scsi_Cmnd *, int code);
82 static int scsi_reset(Scsi_Cmnd *, unsigned int);
83
84 extern void scsi_old_done(Scsi_Cmnd * SCpnt);
85 int update_timeout(Scsi_Cmnd *, int);
86 extern void scsi_old_times_out(Scsi_Cmnd * SCpnt);
87
88 extern int scsi_dispatch_cmd(Scsi_Cmnd * SCpnt);
89
90 #define SCSI_BLOCK(HOST) (HOST->can_queue && HOST->host_busy >= HOST->can_queue)
91
92 static unsigned char generic_sense[6] =
93 {REQUEST_SENSE, 0, 0, 0, 255, 0};
94
95 /*
96 * This is the number of clock ticks we should wait before we time out
97 * and abort the command. This is for where the scsi.c module generates
98 * the command, not where it originates from a higher level, in which
99 * case the timeout is specified there.
100 *
101 * ABORT_TIMEOUT and RESET_TIMEOUT are the timeouts for RESET and ABORT
102 * respectively.
103 */
104
105 #ifdef DEBUG_TIMEOUT
106 static void scsi_dump_status(void);
107 #endif
108
109
110 #ifdef DEBUG
111 #define SCSI_TIMEOUT (5*HZ)
112 #else
113 #define SCSI_TIMEOUT (2*HZ)
114 #endif
115
116 #ifdef DEBUG
117 #define SENSE_TIMEOUT SCSI_TIMEOUT
118 #define ABORT_TIMEOUT SCSI_TIMEOUT
119 #define RESET_TIMEOUT SCSI_TIMEOUT
120 #else
121 #define SENSE_TIMEOUT (5*HZ/10)
122 #define RESET_TIMEOUT (5*HZ/10)
123 #define ABORT_TIMEOUT (5*HZ/10)
124 #endif
125
126
127 /* Do not call reset on error if we just did a reset within 15 sec. */
128 #define MIN_RESET_PERIOD (15*HZ)
129
130
131
132 /*
133 * Flag bits for the internal_timeout array
134 */
135 #define IN_ABORT 1
136 #define IN_RESET 2
137 #define IN_RESET2 4
138 #define IN_RESET3 8
139
140 /*
141 * This is our time out function, called when the timer expires for a
142 * given host adapter. It will attempt to abort the currently executing
143 * command, that failing perform a kernel panic.
144 */
145
146 void scsi_old_times_out(Scsi_Cmnd * SCpnt)
147 {
148 unsigned long flags;
149
150 spin_lock_irqsave(&io_request_lock, flags);
151
152 /* Set the serial_number_at_timeout to the current serial_number */
153 SCpnt->serial_number_at_timeout = SCpnt->serial_number;
154
155 switch (SCpnt->internal_timeout & (IN_ABORT | IN_RESET | IN_RESET2 | IN_RESET3)) {
156 case NORMAL_TIMEOUT:
157 {
158 #ifdef DEBUG_TIMEOUT
159 scsi_dump_status();
160 #endif
161 }
162
163 if (!scsi_abort(SCpnt, DID_TIME_OUT))
164 break;
165 case IN_ABORT:
166 printk("SCSI host %d abort (pid %ld) timed out - resetting\n",
167 SCpnt->host->host_no, SCpnt->pid);
168 if (!scsi_reset(SCpnt, SCSI_RESET_ASYNCHRONOUS))
169 break;
170 case IN_RESET:
171 case (IN_ABORT | IN_RESET):
172 /* This might be controversial, but if there is a bus hang,
173 * you might conceivably want the machine up and running
174 * esp if you have an ide disk.
175 */
176 printk("SCSI host %d channel %d reset (pid %ld) timed out - "
177 "trying harder\n",
178 SCpnt->host->host_no, SCpnt->channel, SCpnt->pid);
179 SCpnt->internal_timeout &= ~IN_RESET;
180 SCpnt->internal_timeout |= IN_RESET2;
181 scsi_reset(SCpnt,
182 SCSI_RESET_ASYNCHRONOUS | SCSI_RESET_SUGGEST_BUS_RESET);
183 break;
184 case IN_RESET2:
185 case (IN_ABORT | IN_RESET2):
186 /* Obviously the bus reset didn't work.
187 * Let's try even harder and call for an HBA reset.
188 * Maybe the HBA itself crashed and this will shake it loose.
189 */
190 printk("SCSI host %d reset (pid %ld) timed out - trying to shake it loose\n",
191 SCpnt->host->host_no, SCpnt->pid);
192 SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2);
193 SCpnt->internal_timeout |= IN_RESET3;
194 scsi_reset(SCpnt,
195 SCSI_RESET_ASYNCHRONOUS | SCSI_RESET_SUGGEST_HOST_RESET);
196 break;
197
198 default:
199 printk("SCSI host %d reset (pid %ld) timed out again -\n",
200 SCpnt->host->host_no, SCpnt->pid);
201 printk("probably an unrecoverable SCSI bus or device hang.\n");
202 break;
203
204 }
205 spin_unlock_irqrestore(&io_request_lock, flags);
206
207 }
208
209 /*
210 * From what I can find in scsi_obsolete.c, this function is only called
211 * by scsi_old_done and scsi_reset. Both of these functions run with the
212 * io_request_lock already held, so we need do nothing here about grabbing
213 * any locks.
214 */
215 static void scsi_request_sense(Scsi_Cmnd * SCpnt)
216 {
217 SCpnt->flags |= WAS_SENSE | ASKED_FOR_SENSE;
218 update_timeout(SCpnt, SENSE_TIMEOUT);
219
220
221 memcpy((void *) SCpnt->cmnd, (void *) generic_sense,
222 sizeof(generic_sense));
223 memset((void *) SCpnt->sense_buffer, 0,
224 sizeof(SCpnt->sense_buffer));
225
226 if (SCpnt->device->scsi_level <= SCSI_2)
227 SCpnt->cmnd[1] = SCpnt->lun << 5;
228 SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
229
230 SCpnt->request_buffer = &SCpnt->sense_buffer;
231 SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
232 SCpnt->use_sg = 0;
233 SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
234 SCpnt->result = 0;
235 SCpnt->sc_data_direction = SCSI_DATA_READ;
236
237 /*
238 * Ugly, ugly. The newer interfaces all assume that the lock
239 * isn't held. Mustn't disappoint, or we deadlock the system.
240 */
241 spin_unlock_irq(&io_request_lock);
242 scsi_dispatch_cmd(SCpnt);
243 spin_lock_irq(&io_request_lock);
244 }
245
246
247
248
249 static int check_sense(Scsi_Cmnd * SCpnt)
250 {
251 /* If there is no sense information, request it. If we have already
252 * requested it, there is no point in asking again - the firmware must
253 * be confused.
254 */
255 if (((SCpnt->sense_buffer[0] & 0x70) >> 4) != 7) {
256 if (!(SCpnt->flags & ASKED_FOR_SENSE))
257 return SUGGEST_SENSE;
258 else
259 return SUGGEST_RETRY;
260 }
261 SCpnt->flags &= ~ASKED_FOR_SENSE;
262
263 #ifdef DEBUG_INIT
264 printk("scsi%d, channel%d : ", SCpnt->host->host_no, SCpnt->channel);
265 print_sense("", SCpnt);
266 printk("\n");
267 #endif
268 if (SCpnt->sense_buffer[2] & 0xe0)
269 return SUGGEST_ABORT;
270
271 switch (SCpnt->sense_buffer[2] & 0xf) {
272 case NO_SENSE:
273 return 0;
274 case RECOVERED_ERROR:
275 return SUGGEST_IS_OK;
276
277 case ABORTED_COMMAND:
278 return SUGGEST_RETRY;
279 case NOT_READY:
280 case UNIT_ATTENTION:
281 /*
282 * If we are expecting a CC/UA because of a bus reset that we
283 * performed, treat this just as a retry. Otherwise this is
284 * information that we should pass up to the upper-level driver
285 * so that we can deal with it there.
286 */
287 if (SCpnt->device->expecting_cc_ua) {
288 SCpnt->device->expecting_cc_ua = 0;
289 return SUGGEST_RETRY;
290 }
291 return SUGGEST_ABORT;
292
293 /* these three are not supported */
294 case COPY_ABORTED:
295 case VOLUME_OVERFLOW:
296 case MISCOMPARE:
297
298 case MEDIUM_ERROR:
299 return SUGGEST_REMAP;
300 case BLANK_CHECK:
301 case DATA_PROTECT:
302 case HARDWARE_ERROR:
303 case ILLEGAL_REQUEST:
304 default:
305 return SUGGEST_ABORT;
306 }
307 }
308
309 /* This function is the mid-level interrupt routine, which decides how
310 * to handle error conditions. Each invocation of this function must
311 * do one and *only* one of the following:
312 *
313 * (1) Call last_cmnd[host].done. This is done for fatal errors and
314 * normal completion, and indicates that the handling for this
315 * request is complete.
316 * (2) Call internal_cmnd to requeue the command. This will result in
317 * scsi_done being called again when the retry is complete.
318 * (3) Call scsi_request_sense. This asks the host adapter/drive for
319 * more information about the error condition. When the information
320 * is available, scsi_done will be called again.
321 * (4) Call reset(). This is sort of a last resort, and the idea is that
322 * this may kick things loose and get the drive working again. reset()
323 * automatically calls scsi_request_sense, and thus scsi_done will be
324 * called again once the reset is complete.
325 *
326 * If none of the above actions are taken, the drive in question
327 * will hang. If more than one of the above actions are taken by
328 * scsi_done, then unpredictable behavior will result.
329 */
330 void scsi_old_done(Scsi_Cmnd * SCpnt)
331 {
332 int status = 0;
333 int exit = 0;
334 int checked;
335 int oldto;
336 struct Scsi_Host *host = SCpnt->host;
337 Scsi_Device * device = SCpnt->device;
338 int result = SCpnt->result;
339 SCpnt->serial_number = 0;
340 SCpnt->serial_number_at_timeout = 0;
341 oldto = update_timeout(SCpnt, 0);
342
343 #ifdef DEBUG_TIMEOUT
344 if (result)
345 printk("Non-zero result in scsi_done %x %d:%d\n",
346 result, SCpnt->target, SCpnt->lun);
347 #endif
348
349 /* If we requested an abort, (and we got it) then fix up the return
350 * status to say why
351 */
352 if (host_byte(result) == DID_ABORT && SCpnt->abort_reason)
353 SCpnt->result = result = (result & 0xff00ffff) |
354 (SCpnt->abort_reason << 16);
355
356
357 #define CMD_FINISHED 0
358 #define MAYREDO 1
359 #define REDO 3
360 #define PENDING 4
361
362 #ifdef DEBUG
363 printk("In scsi_done(host = %d, result = %06x)\n", host->host_no, result);
364 #endif
365
366 if (SCpnt->flags & SYNC_RESET) {
367 /*
368 * The behaviou of scsi_reset(SYNC) was changed in 2.1.? .
369 * The scsi mid-layer does a REDO after every sync reset, the driver
370 * must not do that any more. In order to prevent old drivers from
371 * crashing, all scsi_done() calls during sync resets are ignored.
372 */
373 printk("scsi%d: device driver called scsi_done() "
374 "for a synchronous reset.\n", SCpnt->host->host_no);
375 return;
376 }
377 if (SCpnt->flags & WAS_SENSE) {
378 SCpnt->use_sg = SCpnt->old_use_sg;
379 SCpnt->cmd_len = SCpnt->old_cmd_len;
380 SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
381 SCpnt->underflow = SCpnt->old_underflow;
382 }
383 switch (host_byte(result)) {
384 case DID_OK:
385 if (status_byte(result) && (SCpnt->flags & WAS_SENSE))
386 /* Failed to obtain sense information */
387 {
388 SCpnt->flags &= ~WAS_SENSE;
389 #if 0 /* This cannot possibly be correct. */
390 SCpnt->internal_timeout &= ~SENSE_TIMEOUT;
391 #endif
392
393 if (!(SCpnt->flags & WAS_RESET)) {
394 printk("scsi%d : channel %d target %d lun %d request sense"
395 " failed, performing reset.\n",
396 SCpnt->host->host_no, SCpnt->channel, SCpnt->target,
397 SCpnt->lun);
398 scsi_reset(SCpnt, SCSI_RESET_SYNCHRONOUS);
399 status = REDO;
400 break;
401 } else {
402 exit = (DRIVER_HARD | SUGGEST_ABORT);
403 status = CMD_FINISHED;
404 }
405 } else
406 switch (msg_byte(result)) {
407 case COMMAND_COMPLETE:
408 switch (status_byte(result)) {
409 case GOOD:
410 if (SCpnt->flags & WAS_SENSE) {
411 #ifdef DEBUG
412 printk("In scsi_done, GOOD status, COMMAND COMPLETE, "
413 "parsing sense information.\n");
414 #endif
415 SCpnt->flags &= ~WAS_SENSE;
416 #if 0 /* This cannot possibly be correct. */
417 SCpnt->internal_timeout &= ~SENSE_TIMEOUT;
418 #endif
419
420 switch (checked = check_sense(SCpnt)) {
421 case SUGGEST_SENSE:
422 case 0:
423 #ifdef DEBUG
424 printk("NO SENSE. status = REDO\n");
425 #endif
426 update_timeout(SCpnt, oldto);
427 status = REDO;
428 break;
429 case SUGGEST_IS_OK:
430 break;
431 case SUGGEST_REMAP:
432 #ifdef DEBUG
433 printk("SENSE SUGGEST REMAP - status = CMD_FINISHED\n");
434 #endif
435 status = CMD_FINISHED;
436 exit = DRIVER_SENSE | SUGGEST_ABORT;
437 break;
438 case SUGGEST_RETRY:
439 #ifdef DEBUG
440 printk("SENSE SUGGEST RETRY - status = MAYREDO\n");
441 #endif
442 status = MAYREDO;
443 exit = DRIVER_SENSE | SUGGEST_RETRY;
444 break;
445 case SUGGEST_ABORT:
446 #ifdef DEBUG
447 printk("SENSE SUGGEST ABORT - status = CMD_FINISHED");
448 #endif
449 status = CMD_FINISHED;
450 exit = DRIVER_SENSE | SUGGEST_ABORT;
451 break;
452 default:
453 printk("Internal error %s %d \n", __FILE__,
454 __LINE__);
455 }
456 }
457 /* end WAS_SENSE */
458 else {
459 #ifdef DEBUG
460 printk("COMMAND COMPLETE message returned, "
461 "status = CMD_FINISHED. \n");
462 #endif
463 exit = DRIVER_OK;
464 status = CMD_FINISHED;
465 }
466 break;
467
468 case CHECK_CONDITION:
469 case COMMAND_TERMINATED:
470 switch (check_sense(SCpnt)) {
471 case 0:
472 update_timeout(SCpnt, oldto);
473 status = REDO;
474 break;
475 case SUGGEST_REMAP:
476 status = CMD_FINISHED;
477 exit = DRIVER_SENSE | SUGGEST_ABORT;
478 break;
479 case SUGGEST_RETRY:
480 status = MAYREDO;
481 exit = DRIVER_SENSE | SUGGEST_RETRY;
482 break;
483 case SUGGEST_ABORT:
484 status = CMD_FINISHED;
485 exit = DRIVER_SENSE | SUGGEST_ABORT;
486 break;
487 case SUGGEST_SENSE:
488 scsi_request_sense(SCpnt);
489 status = PENDING;
490 break;
491 }
492 break;
493
494 case CONDITION_GOOD:
495 case INTERMEDIATE_GOOD:
496 case INTERMEDIATE_C_GOOD:
497 break;
498
499 case BUSY:
500 case QUEUE_FULL:
501 update_timeout(SCpnt, oldto);
502 status = REDO;
503 break;
504
505 case RESERVATION_CONFLICT:
506 printk("scsi%d, channel %d : RESERVATION CONFLICT performing"
507 " reset.\n", SCpnt->host->host_no, SCpnt->channel);
508 scsi_reset(SCpnt, SCSI_RESET_SYNCHRONOUS);
509 status = REDO;
510 break;
511 default:
512 printk("Internal error %s %d \n"
513 "status byte = %d \n", __FILE__,
514 __LINE__, status_byte(result));
515
516 }
517 break;
518 default:
519 panic("scsi: unsupported message byte %d received\n",
520 msg_byte(result));
521 }
522 break;
523 case DID_TIME_OUT:
524 #ifdef DEBUG
525 printk("Host returned DID_TIME_OUT - ");
526 #endif
527
528 if (SCpnt->flags & WAS_TIMEDOUT) {
529 #ifdef DEBUG
530 printk("Aborting\n");
531 #endif
532 /*
533 Allow TEST_UNIT_READY and INQUIRY commands to timeout early
534 without causing resets. All other commands should be retried.
535 */
536 if (SCpnt->cmnd[0] != TEST_UNIT_READY &&
537 SCpnt->cmnd[0] != INQUIRY)
538 status = MAYREDO;
539 exit = (DRIVER_TIMEOUT | SUGGEST_ABORT);
540 } else {
541 #ifdef DEBUG
542 printk("Retrying.\n");
543 #endif
544 SCpnt->flags |= WAS_TIMEDOUT;
545 SCpnt->internal_timeout &= ~IN_ABORT;
546 status = REDO;
547 }
548 break;
549 case DID_BUS_BUSY:
550 case DID_PARITY:
551 status = REDO;
552 break;
553 case DID_NO_CONNECT:
554 #ifdef DEBUG
555 printk("Couldn't connect.\n");
556 #endif
557 exit = (DRIVER_HARD | SUGGEST_ABORT);
558 break;
559 case DID_ERROR:
560 status = MAYREDO;
561 exit = (DRIVER_HARD | SUGGEST_ABORT);
562 break;
563 case DID_BAD_TARGET:
564 case DID_ABORT:
565 exit = (DRIVER_INVALID | SUGGEST_ABORT);
566 break;
567 case DID_RESET:
568 if (SCpnt->flags & IS_RESETTING) {
569 SCpnt->flags &= ~IS_RESETTING;
570 status = REDO;
571 break;
572 }
573 if (msg_byte(result) == GOOD &&
574 status_byte(result) == CHECK_CONDITION) {
575 switch (check_sense(SCpnt)) {
576 case 0:
577 update_timeout(SCpnt, oldto);
578 status = REDO;
579 break;
580 case SUGGEST_REMAP:
581 case SUGGEST_RETRY:
582 status = MAYREDO;
583 exit = DRIVER_SENSE | SUGGEST_RETRY;
584 break;
585 case SUGGEST_ABORT:
586 status = CMD_FINISHED;
587 exit = DRIVER_SENSE | SUGGEST_ABORT;
588 break;
589 case SUGGEST_SENSE:
590 scsi_request_sense(SCpnt);
591 status = PENDING;
592 break;
593 }
594 } else {
595 status = REDO;
596 exit = SUGGEST_RETRY;
597 }
598 break;
599 default:
600 exit = (DRIVER_ERROR | SUGGEST_DIE);
601 }
602
603 switch (status) {
604 case CMD_FINISHED:
605 case PENDING:
606 break;
607 case MAYREDO:
608 #ifdef DEBUG
609 printk("In MAYREDO, allowing %d retries, have %d\n",
610 SCpnt->allowed, SCpnt->retries);
611 #endif
612 if ((++SCpnt->retries) < SCpnt->allowed) {
613 if ((SCpnt->retries >= (SCpnt->allowed >> 1))
614 && !(SCpnt->host->resetting && time_before(jiffies, SCpnt->host->last_reset + MIN_RESET_PERIOD))
615 && !(SCpnt->flags & WAS_RESET)) {
616 printk("scsi%d channel %d : resetting for second half of retries.\n",
617 SCpnt->host->host_no, SCpnt->channel);
618 scsi_reset(SCpnt, SCSI_RESET_SYNCHRONOUS);
619 /* fall through to REDO */
620 }
621 } else {
622 status = CMD_FINISHED;
623 break;
624 }
625 /* fall through to REDO */
626
627 case REDO:
628
629 if (SCpnt->flags & WAS_SENSE)
630 scsi_request_sense(SCpnt);
631 else {
632 memcpy((void *) SCpnt->cmnd,
633 (void *) SCpnt->data_cmnd,
634 sizeof(SCpnt->data_cmnd));
635 memset((void *) SCpnt->sense_buffer, 0,
636 sizeof(SCpnt->sense_buffer));
637 SCpnt->request_buffer = SCpnt->buffer;
638 SCpnt->request_bufflen = SCpnt->bufflen;
639 SCpnt->use_sg = SCpnt->old_use_sg;
640 SCpnt->cmd_len = SCpnt->old_cmd_len;
641 SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
642 SCpnt->underflow = SCpnt->old_underflow;
643 SCpnt->result = 0;
644 /*
645 * Ugly, ugly. The newer interfaces all
646 * assume that the lock isn't held. Mustn't
647 * disappoint, or we deadlock the system.
648 */
649 spin_unlock_irq(&io_request_lock);
650 scsi_dispatch_cmd(SCpnt);
651 spin_lock_irq(&io_request_lock);
652 }
653 break;
654 default:
655 INTERNAL_ERROR;
656 }
657
658 if (status == CMD_FINISHED) {
659 Scsi_Request *SRpnt;
660 #ifdef DEBUG
661 printk("Calling done function - at address %p\n", SCpnt->done);
662 #endif
663 host->host_busy--; /* Indicate that we are free */
664 device->device_busy--; /* Decrement device usage counter. */
665
666 SCpnt->result = result | ((exit & 0xff) << 24);
667 SCpnt->use_sg = SCpnt->old_use_sg;
668 SCpnt->cmd_len = SCpnt->old_cmd_len;
669 SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
670 SCpnt->underflow = SCpnt->old_underflow;
671 /*
672 * The upper layers assume the lock isn't held. We mustn't
673 * disappoint them. When the new error handling code is in
674 * use, the upper code is run from a bottom half handler, so
675 * it isn't an issue.
676 */
677 spin_unlock_irq(&io_request_lock);
678 SRpnt = SCpnt->sc_request;
679 if( SRpnt != NULL ) {
680 SRpnt->sr_result = SRpnt->sr_command->result;
681 if( SRpnt->sr_result != 0 ) {
682 memcpy(SRpnt->sr_sense_buffer,
683 SRpnt->sr_command->sense_buffer,
684 sizeof(SRpnt->sr_sense_buffer));
685 }
686 }
687
688 SCpnt->done(SCpnt);
689 spin_lock_irq(&io_request_lock);
690 }
691 #undef CMD_FINISHED
692 #undef REDO
693 #undef MAYREDO
694 #undef PENDING
695 }
696
697 /*
698 * The scsi_abort function interfaces with the abort() function of the host
699 * we are aborting, and causes the current command to not complete. The
700 * caller should deal with any error messages or status returned on the
701 * next call.
702 *
703 * This will not be called reentrantly for a given host.
704 */
705
706 /*
707 * Since we're nice guys and specified that abort() and reset()
708 * can be non-reentrant. The internal_timeout flags are used for
709 * this.
710 */
711
712
713 static int scsi_abort(Scsi_Cmnd * SCpnt, int why)
714 {
715 int oldto;
716 struct Scsi_Host *host = SCpnt->host;
717
718 while (1) {
719
720 /*
721 * Protect against races here. If the command is done, or we are
722 * on a different command forget it.
723 */
724 if (SCpnt->serial_number != SCpnt->serial_number_at_timeout) {
725 return 0;
726 }
727 if (SCpnt->internal_timeout & IN_ABORT) {
728 spin_unlock_irq(&io_request_lock);
729 while (SCpnt->internal_timeout & IN_ABORT)
730 barrier();
731 spin_lock_irq(&io_request_lock);
732 } else {
733 SCpnt->internal_timeout |= IN_ABORT;
734 oldto = update_timeout(SCpnt, ABORT_TIMEOUT);
735
736 if ((SCpnt->flags & IS_RESETTING) && SCpnt->device->soft_reset) {
737 /* OK, this command must have died when we did the
738 * reset. The device itself must have lied.
739 */
740 printk("Stale command on %d %d:%d appears to have died when"
741 " the bus was reset\n",
742 SCpnt->channel, SCpnt->target, SCpnt->lun);
743 }
744 if (!host->host_busy) {
745 SCpnt->internal_timeout &= ~IN_ABORT;
746 update_timeout(SCpnt, oldto);
747 return 0;
748 }
749 printk("scsi : aborting command due to timeout : pid %lu, scsi%d,"
750 " channel %d, id %d, lun %d ",
751 SCpnt->pid, SCpnt->host->host_no, (int) SCpnt->channel,
752 (int) SCpnt->target, (int) SCpnt->lun);
753 print_command(SCpnt->cmnd);
754 if (SCpnt->serial_number != SCpnt->serial_number_at_timeout)
755 return 0;
756 SCpnt->abort_reason = why;
757 switch (host->hostt->abort(SCpnt)) {
758 /* We do not know how to abort. Try waiting another
759 * time increment and see if this helps. Set the
760 * WAS_TIMEDOUT flag set so we do not try this twice
761 */
762 case SCSI_ABORT_BUSY: /* Tough call - returning 1 from
763 * this is too severe
764 */
765 case SCSI_ABORT_SNOOZE:
766 if (why == DID_TIME_OUT) {
767 SCpnt->internal_timeout &= ~IN_ABORT;
768 if (SCpnt->flags & WAS_TIMEDOUT) {
769 return 1; /* Indicate we cannot handle this.
770 * We drop down into the reset handler
771 * and try again
772 */
773 } else {
774 SCpnt->flags |= WAS_TIMEDOUT;
775 oldto = SCpnt->timeout_per_command;
776 update_timeout(SCpnt, oldto);
777 }
778 }
779 return 0;
780 case SCSI_ABORT_PENDING:
781 if (why != DID_TIME_OUT) {
782 update_timeout(SCpnt, oldto);
783 }
784 return 0;
785 case SCSI_ABORT_SUCCESS:
786 /* We should have already aborted this one. No
787 * need to adjust timeout
788 */
789 SCpnt->internal_timeout &= ~IN_ABORT;
790 return 0;
791 case SCSI_ABORT_NOT_RUNNING:
792 SCpnt->internal_timeout &= ~IN_ABORT;
793 update_timeout(SCpnt, 0);
794 return 0;
795 case SCSI_ABORT_ERROR:
796 default:
797 SCpnt->internal_timeout &= ~IN_ABORT;
798 return 1;
799 }
800 }
801 }
802 }
803
804
805 /* Mark a single SCSI Device as having been reset. */
806
807 static inline void scsi_mark_device_reset(Scsi_Device * Device)
808 {
809 Device->was_reset = 1;
810 Device->expecting_cc_ua = 1;
811 }
812
813
814 /* Mark all SCSI Devices on a specific Host as having been reset. */
815
816 void scsi_mark_host_reset(struct Scsi_Host *Host)
817 {
818 Scsi_Cmnd *SCpnt;
819 Scsi_Device *SDpnt;
820
821 for (SDpnt = Host->host_queue; SDpnt; SDpnt = SDpnt->next) {
822 for (SCpnt = SDpnt->device_queue; SCpnt; SCpnt = SCpnt->next)
823 scsi_mark_device_reset(SCpnt->device);
824 }
825 }
826
827
828 /* Mark all SCSI Devices on a specific Host Bus as having been reset. */
829
830 static void scsi_mark_bus_reset(struct Scsi_Host *Host, int channel)
831 {
832 Scsi_Cmnd *SCpnt;
833 Scsi_Device *SDpnt;
834
835 for (SDpnt = Host->host_queue; SDpnt; SDpnt = SDpnt->next) {
836 for (SCpnt = SDpnt->device_queue; SCpnt; SCpnt = SCpnt->next)
837 if (SCpnt->channel == channel)
838 scsi_mark_device_reset(SCpnt->device);
839 }
840 }
841
842
843 static int scsi_reset(Scsi_Cmnd * SCpnt, unsigned int reset_flags)
844 {
845 int temp;
846 Scsi_Cmnd *SCpnt1;
847 Scsi_Device *SDpnt;
848 struct Scsi_Host *host = SCpnt->host;
849
850 printk("SCSI bus is being reset for host %d channel %d.\n",
851 host->host_no, SCpnt->channel);
852
853 #if 0
854 /*
855 * First of all, we need to make a recommendation to the low-level
856 * driver as to whether a BUS_DEVICE_RESET should be performed,
857 * or whether we should do a full BUS_RESET. There is no simple
858 * algorithm here - we basically use a series of heuristics
859 * to determine what we should do.
860 */
861 SCpnt->host->suggest_bus_reset = FALSE;
862
863 /*
864 * First see if all of the active devices on the bus have
865 * been jammed up so that we are attempting resets. If so,
866 * then suggest a bus reset. Forcing a bus reset could
867 * result in some race conditions, but no more than
868 * you would usually get with timeouts. We will cross
869 * that bridge when we come to it.
870 *
871 * This is actually a pretty bad idea, since a sequence of
872 * commands will often timeout together and this will cause a
873 * Bus Device Reset followed immediately by a SCSI Bus Reset.
874 * If all of the active devices really are jammed up, the
875 * Bus Device Reset will quickly timeout and scsi_times_out
876 * will follow up with a SCSI Bus Reset anyway.
877 */
878 SCpnt1 = host->host_queue;
879 while (SCpnt1) {
880 if (SCpnt1->request.rq_status != RQ_INACTIVE
881 && (SCpnt1->flags & (WAS_RESET | IS_RESETTING)) == 0)
882 break;
883 SCpnt1 = SCpnt1->next;
884 }
885 if (SCpnt1 == NULL) {
886 reset_flags |= SCSI_RESET_SUGGEST_BUS_RESET;
887 }
888 /*
889 * If the code that called us is suggesting a hard reset, then
890 * definitely request it. This usually occurs because a
891 * BUS_DEVICE_RESET times out.
892 *
893 * Passing reset_flags along takes care of this automatically.
894 */
895 if (reset_flags & SCSI_RESET_SUGGEST_BUS_RESET) {
896 SCpnt->host->suggest_bus_reset = TRUE;
897 }
898 #endif
899
900 while (1) {
901
902 /*
903 * Protect against races here. If the command is done, or we are
904 * on a different command forget it.
905 */
906 if (reset_flags & SCSI_RESET_ASYNCHRONOUS)
907 if (SCpnt->serial_number != SCpnt->serial_number_at_timeout) {
908 return 0;
909 }
910 if (SCpnt->internal_timeout & IN_RESET) {
911 spin_unlock_irq(&io_request_lock);
912 while (SCpnt->internal_timeout & IN_RESET)
913 barrier();
914 spin_lock_irq(&io_request_lock);
915 } else {
916 SCpnt->internal_timeout |= IN_RESET;
917 update_timeout(SCpnt, RESET_TIMEOUT);
918
919 if (reset_flags & SCSI_RESET_SYNCHRONOUS)
920 SCpnt->flags |= SYNC_RESET;
921 if (host->host_busy) {
922 for (SDpnt = host->host_queue; SDpnt; SDpnt = SDpnt->next) {
923 SCpnt1 = SDpnt->device_queue;
924 while (SCpnt1) {
925 if (SCpnt1->request.rq_status != RQ_INACTIVE) {
926 #if 0
927 if (!(SCpnt1->flags & IS_RESETTING) &&
928 !(SCpnt1->internal_timeout & IN_ABORT))
929 scsi_abort(SCpnt1, DID_RESET);
930 #endif
931 SCpnt1->flags |= (WAS_RESET | IS_RESETTING);
932 }
933 SCpnt1 = SCpnt1->next;
934 }
935 }
936
937 host->last_reset = jiffies;
938 host->resetting = 1;
939 /*
940 * I suppose that the host reset callback will not play
941 * with the resetting field. We have just set the resetting
942 * flag here. -arca
943 */
944 temp = host->hostt->reset(SCpnt, reset_flags);
945 /*
946 This test allows the driver to introduce an additional bus
947 settle time delay by setting last_reset up to 20 seconds in
948 the future. In the normal case where the driver does not
949 modify last_reset, it must be assumed that the actual bus
950 reset occurred immediately prior to the return to this code,
951 and so last_reset must be updated to the current time, so
952 that the delay in internal_cmnd will guarantee at least a
953 MIN_RESET_DELAY bus settle time.
954 */
955 if (host->last_reset - jiffies > 20UL * HZ)
956 host->last_reset = jiffies;
957 } else {
958 host->host_busy++;
959 host->last_reset = jiffies;
960 host->resetting = 1;
961 SCpnt->flags |= (WAS_RESET | IS_RESETTING);
962 /*
963 * I suppose that the host reset callback will not play
964 * with the resetting field. We have just set the resetting
965 * flag here. -arca
966 */
967 temp = host->hostt->reset(SCpnt, reset_flags);
968 if (time_before(host->last_reset, jiffies) ||
969 (time_after(host->last_reset, jiffies + 20 * HZ)))
970 host->last_reset = jiffies;
971 host->host_busy--;
972 }
973 if (reset_flags & SCSI_RESET_SYNCHRONOUS)
974 SCpnt->flags &= ~SYNC_RESET;
975
976 #ifdef DEBUG
977 printk("scsi reset function returned %d\n", temp);
978 #endif
979
980 /*
981 * Now figure out what we need to do, based upon
982 * what the low level driver said that it did.
983 * If the result is SCSI_RESET_SUCCESS, SCSI_RESET_PENDING,
984 * or SCSI_RESET_WAKEUP, then the low level driver did a
985 * bus device reset or bus reset, so we should go through
986 * and mark one or all of the devices on that bus
987 * as having been reset.
988 */
989 switch (temp & SCSI_RESET_ACTION) {
990 case SCSI_RESET_SUCCESS:
991 if (temp & SCSI_RESET_HOST_RESET)
992 scsi_mark_host_reset(host);
993 else if (temp & SCSI_RESET_BUS_RESET)
994 scsi_mark_bus_reset(host, SCpnt->channel);
995 else
996 scsi_mark_device_reset(SCpnt->device);
997 SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
998 return 0;
999 case SCSI_RESET_PENDING:
1000 if (temp & SCSI_RESET_HOST_RESET)
1001 scsi_mark_host_reset(host);
1002 else if (temp & SCSI_RESET_BUS_RESET)
1003 scsi_mark_bus_reset(host, SCpnt->channel);
1004 else
1005 scsi_mark_device_reset(SCpnt->device);
1006 case SCSI_RESET_NOT_RUNNING:
1007 return 0;
1008 case SCSI_RESET_PUNT:
1009 SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
1010 scsi_request_sense(SCpnt);
1011 return 0;
1012 case SCSI_RESET_WAKEUP:
1013 if (temp & SCSI_RESET_HOST_RESET)
1014 scsi_mark_host_reset(host);
1015 else if (temp & SCSI_RESET_BUS_RESET)
1016 scsi_mark_bus_reset(host, SCpnt->channel);
1017 else
1018 scsi_mark_device_reset(SCpnt->device);
1019 SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
1020 scsi_request_sense(SCpnt);
1021 /*
1022 * If a bus reset was performed, we
1023 * need to wake up each and every command
1024 * that was active on the bus or if it was a HBA
1025 * reset all active commands on all channels
1026 */
1027 if (temp & SCSI_RESET_HOST_RESET) {
1028 for (SDpnt = host->host_queue; SDpnt; SDpnt = SDpnt->next) {
1029 SCpnt1 = SDpnt->device_queue;
1030 while (SCpnt1) {
1031 if (SCpnt1->request.rq_status != RQ_INACTIVE
1032 && SCpnt1 != SCpnt)
1033 scsi_request_sense(SCpnt1);
1034 SCpnt1 = SCpnt1->next;
1035 }
1036 }
1037 } else if (temp & SCSI_RESET_BUS_RESET) {
1038 for (SDpnt = host->host_queue; SDpnt; SDpnt = SDpnt->next) {
1039 SCpnt1 = SDpnt->device_queue;
1040 while (SCpnt1) {
1041 if (SCpnt1->request.rq_status != RQ_INACTIVE
1042 && SCpnt1 != SCpnt
1043 && SCpnt1->channel == SCpnt->channel)
1044 scsi_request_sense(SCpnt);
1045 SCpnt1 = SCpnt1->next;
1046 }
1047 }
1048 }
1049 return 0;
1050 case SCSI_RESET_SNOOZE:
1051 /* In this case, we set the timeout field to 0
1052 * so that this command does not time out any more,
1053 * and we return 1 so that we get a message on the
1054 * screen.
1055 */
1056 SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
1057 update_timeout(SCpnt, 0);
1058 /* If you snooze, you lose... */
1059 case SCSI_RESET_ERROR:
1060 default:
1061 return 1;
1062 }
1063
1064 return temp;
1065 }
1066 }
1067 }
1068
1069 /*
1070 * The strategy is to cause the timer code to call scsi_times_out()
1071 * when the soonest timeout is pending.
1072 * The arguments are used when we are queueing a new command, because
1073 * we do not want to subtract the time used from this time, but when we
1074 * set the timer, we want to take this value into account.
1075 */
1076
1077 int update_timeout(Scsi_Cmnd * SCset, int timeout)
1078 {
1079 int rtn;
1080
1081 /*
1082 * We are using the new error handling code to actually register/deregister
1083 * timers for timeout.
1084 */
1085
1086 if (!timer_pending(&SCset->eh_timeout)) {
1087 rtn = 0;
1088 } else {
1089 rtn = SCset->eh_timeout.expires - jiffies;
1090 }
1091
1092 if (timeout == 0) {
1093 scsi_delete_timer(SCset);
1094 } else {
1095 scsi_add_timer(SCset, timeout, scsi_old_times_out);
1096 }
1097
1098 return rtn;
1099 }
1100
1101
1102 /*
1103 * Overrides for Emacs so that we follow Linus's tabbing style.
1104 * Emacs will notice this stuff at the end of the file and automatically
1105 * adjust the settings for this buffer only. This must remain at the end
1106 * of the file.
1107 * ---------------------------------------------------------------------------
1108 * Local variables:
1109 * c-indent-level: 4
1110 * c-brace-imaginary-offset: 0
1111 * c-brace-offset: -4
1112 * c-argdecl-indent: 4
1113 * c-label-offset: -4
1114 * c-continued-statement-offset: 4
1115 * c-continued-brace-offset: 0
1116 * indent-tabs-mode: nil
1117 * tab-width: 8
1118 * End:
1119 */
1120