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[CIFS] Correct cifs tcp retry when some data sent before getting EAGAIN.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / scsi_transport_spi.c
blob7670919a087a6e526416419bb0b4035982d136cb
1 /*
2 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <asm/semaphore.h>
27 #include <scsi/scsi.h>
28 #include "scsi_priv.h"
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_request.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_spi.h>
35
36 #define SPI_PRINTK(x, l, f, a...) dev_printk(l, &(x)->dev, f , ##a)
37
38 #define SPI_NUM_ATTRS 13 /* increase this if you add attributes */
39 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
40 * on" attributes */
41 #define SPI_HOST_ATTRS 1
42
43 #define SPI_MAX_ECHO_BUFFER_SIZE 4096
44
45 #define DV_LOOPS 3
46 #define DV_TIMEOUT (10*HZ)
47 #define DV_RETRIES 3 /* should only need at most
48 * two cc/ua clears */
49
50 /* Private data accessors (keep these out of the header file) */
51 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
52 #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem)
53
54 struct spi_internal {
55 struct scsi_transport_template t;
56 struct spi_function_template *f;
57 /* The actual attributes */
58 struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
59 /* The array of null terminated pointers to attributes
60 * needed by scsi_sysfs.c */
61 struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
62 struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
63 struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
64 };
65
66 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
67
68 static const int ppr_to_ps[] = {
69 /* The PPR values 0-6 are reserved, fill them in when
70 * the committee defines them */
71 -1, /* 0x00 */
72 -1, /* 0x01 */
73 -1, /* 0x02 */
74 -1, /* 0x03 */
75 -1, /* 0x04 */
76 -1, /* 0x05 */
77 -1, /* 0x06 */
78 3125, /* 0x07 */
79 6250, /* 0x08 */
80 12500, /* 0x09 */
81 25000, /* 0x0a */
82 30300, /* 0x0b */
83 50000, /* 0x0c */
84 };
85 /* The PPR values at which you calculate the period in ns by multiplying
86 * by 4 */
87 #define SPI_STATIC_PPR 0x0c
88
89 static int sprint_frac(char *dest, int value, int denom)
90 {
91 int frac = value % denom;
92 int result = sprintf(dest, "%d", value / denom);
93
94 if (frac == 0)
95 return result;
96 dest[result++] = '.';
97
98 do {
99 denom /= 10;
100 sprintf(dest + result, "%d", frac / denom);
101 result++;
102 frac %= denom;
103 } while (frac);
104
105 dest[result++] = '\0';
106 return result;
107 }
108
109 /* Modification of scsi_wait_req that will clear UNIT ATTENTION conditions
110 * resulting from (likely) bus and device resets */
111 static void spi_wait_req(struct scsi_request *sreq, const void *cmd,
112 void *buffer, unsigned bufflen)
113 {
114 int i;
115
116 for(i = 0; i < DV_RETRIES; i++) {
117 sreq->sr_request->flags |= REQ_FAILFAST;
118
119 scsi_wait_req(sreq, cmd, buffer, bufflen,
120 DV_TIMEOUT, /* retries */ 1);
121 if (sreq->sr_result & DRIVER_SENSE) {
122 struct scsi_sense_hdr sshdr;
123
124 if (scsi_request_normalize_sense(sreq, &sshdr)
125 && sshdr.sense_key == UNIT_ATTENTION)
126 continue;
127 }
128 break;
129 }
130 }
131
132 static struct {
133 enum spi_signal_type value;
134 char *name;
135 } signal_types[] = {
136 { SPI_SIGNAL_UNKNOWN, "unknown" },
137 { SPI_SIGNAL_SE, "SE" },
138 { SPI_SIGNAL_LVD, "LVD" },
139 { SPI_SIGNAL_HVD, "HVD" },
140 };
141
142 static inline const char *spi_signal_to_string(enum spi_signal_type type)
143 {
144 int i;
145
146 for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
147 if (type == signal_types[i].value)
148 return signal_types[i].name;
149 }
150 return NULL;
151 }
152 static inline enum spi_signal_type spi_signal_to_value(const char *name)
153 {
154 int i, len;
155
156 for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
157 len = strlen(signal_types[i].name);
158 if (strncmp(name, signal_types[i].name, len) == 0 &&
159 (name[len] == '\n' || name[len] == '\0'))
160 return signal_types[i].value;
161 }
162 return SPI_SIGNAL_UNKNOWN;
163 }
164
165 static int spi_host_setup(struct device *dev)
166 {
167 struct Scsi_Host *shost = dev_to_shost(dev);
168
169 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
170
171 return 0;
172 }
173
174 static DECLARE_TRANSPORT_CLASS(spi_host_class,
175 "spi_host",
176 spi_host_setup,
177 NULL,
178 NULL);
179
180 static int spi_host_match(struct attribute_container *cont,
181 struct device *dev)
182 {
183 struct Scsi_Host *shost;
184 struct spi_internal *i;
185
186 if (!scsi_is_host_device(dev))
187 return 0;
188
189 shost = dev_to_shost(dev);
190 if (!shost->transportt || shost->transportt->host_attrs.ac.class
191 != &spi_host_class.class)
192 return 0;
193
194 i = to_spi_internal(shost->transportt);
195
196 return &i->t.host_attrs.ac == cont;
197 }
198
199 static int spi_device_configure(struct device *dev)
200 {
201 struct scsi_device *sdev = to_scsi_device(dev);
202 struct scsi_target *starget = sdev->sdev_target;
203
204 /* Populate the target capability fields with the values
205 * gleaned from the device inquiry */
206
207 spi_support_sync(starget) = scsi_device_sync(sdev);
208 spi_support_wide(starget) = scsi_device_wide(sdev);
209 spi_support_dt(starget) = scsi_device_dt(sdev);
210 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
211 spi_support_ius(starget) = scsi_device_ius(sdev);
212 spi_support_qas(starget) = scsi_device_qas(sdev);
213
214 return 0;
215 }
216
217 static int spi_setup_transport_attrs(struct device *dev)
218 {
219 struct scsi_target *starget = to_scsi_target(dev);
220
221 spi_period(starget) = -1; /* illegal value */
222 spi_min_period(starget) = 0;
223 spi_offset(starget) = 0; /* async */
224 spi_max_offset(starget) = 255;
225 spi_width(starget) = 0; /* narrow */
226 spi_max_width(starget) = 1;
227 spi_iu(starget) = 0; /* no IU */
228 spi_dt(starget) = 0; /* ST */
229 spi_qas(starget) = 0;
230 spi_wr_flow(starget) = 0;
231 spi_rd_strm(starget) = 0;
232 spi_rti(starget) = 0;
233 spi_pcomp_en(starget) = 0;
234 spi_dv_pending(starget) = 0;
235 spi_initial_dv(starget) = 0;
236 init_MUTEX(&spi_dv_sem(starget));
237
238 return 0;
239 }
240
241 #define spi_transport_show_simple(field, format_string) \
242 \
243 static ssize_t \
244 show_spi_transport_##field(struct class_device *cdev, char *buf) \
245 { \
246 struct scsi_target *starget = transport_class_to_starget(cdev); \
247 struct spi_transport_attrs *tp; \
248 \
249 tp = (struct spi_transport_attrs *)&starget->starget_data; \
250 return snprintf(buf, 20, format_string, tp->field); \
251 }
252
253 #define spi_transport_store_simple(field, format_string) \
254 \
255 static ssize_t \
256 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
257 size_t count) \
258 { \
259 int val; \
260 struct scsi_target *starget = transport_class_to_starget(cdev); \
261 struct spi_transport_attrs *tp; \
262 \
263 tp = (struct spi_transport_attrs *)&starget->starget_data; \
264 val = simple_strtoul(buf, NULL, 0); \
265 tp->field = val; \
266 return count; \
267 }
268
269 #define spi_transport_show_function(field, format_string) \
270 \
271 static ssize_t \
272 show_spi_transport_##field(struct class_device *cdev, char *buf) \
273 { \
274 struct scsi_target *starget = transport_class_to_starget(cdev); \
275 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
276 struct spi_transport_attrs *tp; \
277 struct spi_internal *i = to_spi_internal(shost->transportt); \
278 tp = (struct spi_transport_attrs *)&starget->starget_data; \
279 if (i->f->get_##field) \
280 i->f->get_##field(starget); \
281 return snprintf(buf, 20, format_string, tp->field); \
282 }
283
284 #define spi_transport_store_function(field, format_string) \
285 static ssize_t \
286 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
287 size_t count) \
288 { \
289 int val; \
290 struct scsi_target *starget = transport_class_to_starget(cdev); \
291 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
292 struct spi_internal *i = to_spi_internal(shost->transportt); \
293 \
294 val = simple_strtoul(buf, NULL, 0); \
295 i->f->set_##field(starget, val); \
296 return count; \
297 }
298
299 #define spi_transport_store_max(field, format_string) \
300 static ssize_t \
301 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
302 size_t count) \
303 { \
304 int val; \
305 struct scsi_target *starget = transport_class_to_starget(cdev); \
306 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
307 struct spi_internal *i = to_spi_internal(shost->transportt); \
308 struct spi_transport_attrs *tp \
309 = (struct spi_transport_attrs *)&starget->starget_data; \
310 \
311 val = simple_strtoul(buf, NULL, 0); \
312 if (val > tp->max_##field) \
313 val = tp->max_##field; \
314 i->f->set_##field(starget, val); \
315 return count; \
316 }
317
318 #define spi_transport_rd_attr(field, format_string) \
319 spi_transport_show_function(field, format_string) \
320 spi_transport_store_function(field, format_string) \
321 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
322 show_spi_transport_##field, \
323 store_spi_transport_##field);
324
325 #define spi_transport_simple_attr(field, format_string) \
326 spi_transport_show_simple(field, format_string) \
327 spi_transport_store_simple(field, format_string) \
328 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
329 show_spi_transport_##field, \
330 store_spi_transport_##field);
331
332 #define spi_transport_max_attr(field, format_string) \
333 spi_transport_show_function(field, format_string) \
334 spi_transport_store_max(field, format_string) \
335 spi_transport_simple_attr(max_##field, format_string) \
336 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
337 show_spi_transport_##field, \
338 store_spi_transport_##field);
339
340 /* The Parallel SCSI Tranport Attributes: */
341 spi_transport_max_attr(offset, "%d\n");
342 spi_transport_max_attr(width, "%d\n");
343 spi_transport_rd_attr(iu, "%d\n");
344 spi_transport_rd_attr(dt, "%d\n");
345 spi_transport_rd_attr(qas, "%d\n");
346 spi_transport_rd_attr(wr_flow, "%d\n");
347 spi_transport_rd_attr(rd_strm, "%d\n");
348 spi_transport_rd_attr(rti, "%d\n");
349 spi_transport_rd_attr(pcomp_en, "%d\n");
350
351 /* we only care about the first child device so we return 1 */
352 static int child_iter(struct device *dev, void *data)
353 {
354 struct scsi_device *sdev = to_scsi_device(dev);
355
356 spi_dv_device(sdev);
357 return 1;
358 }
359
360 static ssize_t
361 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
362 {
363 struct scsi_target *starget = transport_class_to_starget(cdev);
364
365 device_for_each_child(&starget->dev, NULL, child_iter);
366 return count;
367 }
368 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
369
370 /* Translate the period into ns according to the current spec
371 * for SDTR/PPR messages */
372 static ssize_t
373 show_spi_transport_period_helper(struct class_device *cdev, char *buf,
374 int period)
375 {
376 int len, picosec;
377
378 if (period < 0 || period > 0xff) {
379 picosec = -1;
380 } else if (period <= SPI_STATIC_PPR) {
381 picosec = ppr_to_ps[period];
382 } else {
383 picosec = period * 4000;
384 }
385
386 if (picosec == -1) {
387 len = sprintf(buf, "reserved");
388 } else {
389 len = sprint_frac(buf, picosec, 1000);
390 }
391
392 buf[len++] = '\n';
393 buf[len] = '\0';
394 return len;
395 }
396
397 static ssize_t
398 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
399 size_t count, int *periodp)
400 {
401 int j, picosec, period = -1;
402 char *endp;
403
404 picosec = simple_strtoul(buf, &endp, 10) * 1000;
405 if (*endp == '.') {
406 int mult = 100;
407 do {
408 endp++;
409 if (!isdigit(*endp))
410 break;
411 picosec += (*endp - '0') * mult;
412 mult /= 10;
413 } while (mult > 0);
414 }
415
416 for (j = 0; j <= SPI_STATIC_PPR; j++) {
417 if (ppr_to_ps[j] < picosec)
418 continue;
419 period = j;
420 break;
421 }
422
423 if (period == -1)
424 period = picosec / 4000;
425
426 if (period > 0xff)
427 period = 0xff;
428
429 *periodp = period;
430
431 return count;
432 }
433
434 static ssize_t
435 show_spi_transport_period(struct class_device *cdev, char *buf)
436 {
437 struct scsi_target *starget = transport_class_to_starget(cdev);
438 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
439 struct spi_internal *i = to_spi_internal(shost->transportt);
440 struct spi_transport_attrs *tp =
441 (struct spi_transport_attrs *)&starget->starget_data;
442
443 if (i->f->get_period)
444 i->f->get_period(starget);
445
446 return show_spi_transport_period_helper(cdev, buf, tp->period);
447 }
448
449 static ssize_t
450 store_spi_transport_period(struct class_device *cdev, const char *buf,
451 size_t count)
452 {
453 struct scsi_target *starget = transport_class_to_starget(cdev);
454 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
455 struct spi_internal *i = to_spi_internal(shost->transportt);
456 struct spi_transport_attrs *tp =
457 (struct spi_transport_attrs *)&starget->starget_data;
458 int period, retval;
459
460 retval = store_spi_transport_period_helper(cdev, buf, count, &period);
461
462 if (period < tp->min_period)
463 period = tp->min_period;
464
465 i->f->set_period(starget, period);
466
467 return retval;
468 }
469
470 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
471 show_spi_transport_period,
472 store_spi_transport_period);
473
474 static ssize_t
475 show_spi_transport_min_period(struct class_device *cdev, char *buf)
476 {
477 struct scsi_target *starget = transport_class_to_starget(cdev);
478 struct spi_transport_attrs *tp =
479 (struct spi_transport_attrs *)&starget->starget_data;
480
481 return show_spi_transport_period_helper(cdev, buf, tp->min_period);
482 }
483
484 static ssize_t
485 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
486 size_t count)
487 {
488 struct scsi_target *starget = transport_class_to_starget(cdev);
489 struct spi_transport_attrs *tp =
490 (struct spi_transport_attrs *)&starget->starget_data;
491
492 return store_spi_transport_period_helper(cdev, buf, count,
493 &tp->min_period);
494 }
495
496
497 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
498 show_spi_transport_min_period,
499 store_spi_transport_min_period);
500
501
502 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
503 {
504 struct Scsi_Host *shost = transport_class_to_shost(cdev);
505 struct spi_internal *i = to_spi_internal(shost->transportt);
506
507 if (i->f->get_signalling)
508 i->f->get_signalling(shost);
509
510 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
511 }
512 static ssize_t store_spi_host_signalling(struct class_device *cdev,
513 const char *buf, size_t count)
514 {
515 struct Scsi_Host *shost = transport_class_to_shost(cdev);
516 struct spi_internal *i = to_spi_internal(shost->transportt);
517 enum spi_signal_type type = spi_signal_to_value(buf);
518
519 if (type != SPI_SIGNAL_UNKNOWN)
520 i->f->set_signalling(shost, type);
521
522 return count;
523 }
524 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
525 show_spi_host_signalling,
526 store_spi_host_signalling);
527
528 #define DV_SET(x, y) \
529 if(i->f->set_##x) \
530 i->f->set_##x(sdev->sdev_target, y)
531
532 enum spi_compare_returns {
533 SPI_COMPARE_SUCCESS,
534 SPI_COMPARE_FAILURE,
535 SPI_COMPARE_SKIP_TEST,
536 };
537
538
539 /* This is for read/write Domain Validation: If the device supports
540 * an echo buffer, we do read/write tests to it */
541 static enum spi_compare_returns
542 spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer,
543 u8 *ptr, const int retries)
544 {
545 struct scsi_device *sdev = sreq->sr_device;
546 int len = ptr - buffer;
547 int j, k, r;
548 unsigned int pattern = 0x0000ffff;
549
550 const char spi_write_buffer[] = {
551 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
552 };
553 const char spi_read_buffer[] = {
554 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
555 };
556
557 /* set up the pattern buffer. Doesn't matter if we spill
558 * slightly beyond since that's where the read buffer is */
559 for (j = 0; j < len; ) {
560
561 /* fill the buffer with counting (test a) */
562 for ( ; j < min(len, 32); j++)
563 buffer[j] = j;
564 k = j;
565 /* fill the buffer with alternating words of 0x0 and
566 * 0xffff (test b) */
567 for ( ; j < min(len, k + 32); j += 2) {
568 u16 *word = (u16 *)&buffer[j];
569
570 *word = (j & 0x02) ? 0x0000 : 0xffff;
571 }
572 k = j;
573 /* fill with crosstalk (alternating 0x5555 0xaaa)
574 * (test c) */
575 for ( ; j < min(len, k + 32); j += 2) {
576 u16 *word = (u16 *)&buffer[j];
577
578 *word = (j & 0x02) ? 0x5555 : 0xaaaa;
579 }
580 k = j;
581 /* fill with shifting bits (test d) */
582 for ( ; j < min(len, k + 32); j += 4) {
583 u32 *word = (unsigned int *)&buffer[j];
584 u32 roll = (pattern & 0x80000000) ? 1 : 0;
585
586 *word = pattern;
587 pattern = (pattern << 1) | roll;
588 }
589 /* don't bother with random data (test e) */
590 }
591
592 for (r = 0; r < retries; r++) {
593 sreq->sr_cmd_len = 0; /* wait_req to fill in */
594 sreq->sr_data_direction = DMA_TO_DEVICE;
595 spi_wait_req(sreq, spi_write_buffer, buffer, len);
596 if(sreq->sr_result || !scsi_device_online(sdev)) {
597 struct scsi_sense_hdr sshdr;
598
599 scsi_device_set_state(sdev, SDEV_QUIESCE);
600 if (scsi_request_normalize_sense(sreq, &sshdr)
601 && sshdr.sense_key == ILLEGAL_REQUEST
602 /* INVALID FIELD IN CDB */
603 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
604 /* This would mean that the drive lied
605 * to us about supporting an echo
606 * buffer (unfortunately some Western
607 * Digital drives do precisely this)
608 */
609 return SPI_COMPARE_SKIP_TEST;
610
611
612 SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Write Buffer failure %x\n", sreq->sr_result);
613 return SPI_COMPARE_FAILURE;
614 }
615
616 memset(ptr, 0, len);
617 sreq->sr_cmd_len = 0; /* wait_req to fill in */
618 sreq->sr_data_direction = DMA_FROM_DEVICE;
619 spi_wait_req(sreq, spi_read_buffer, ptr, len);
620 scsi_device_set_state(sdev, SDEV_QUIESCE);
621
622 if (memcmp(buffer, ptr, len) != 0)
623 return SPI_COMPARE_FAILURE;
624 }
625 return SPI_COMPARE_SUCCESS;
626 }
627
628 /* This is for the simplest form of Domain Validation: a read test
629 * on the inquiry data from the device */
630 static enum spi_compare_returns
631 spi_dv_device_compare_inquiry(struct scsi_request *sreq, u8 *buffer,
632 u8 *ptr, const int retries)
633 {
634 int r;
635 const int len = sreq->sr_device->inquiry_len;
636 struct scsi_device *sdev = sreq->sr_device;
637 const char spi_inquiry[] = {
638 INQUIRY, 0, 0, 0, len, 0
639 };
640
641 for (r = 0; r < retries; r++) {
642 sreq->sr_cmd_len = 0; /* wait_req to fill in */
643 sreq->sr_data_direction = DMA_FROM_DEVICE;
644
645 memset(ptr, 0, len);
646
647 spi_wait_req(sreq, spi_inquiry, ptr, len);
648
649 if(sreq->sr_result || !scsi_device_online(sdev)) {
650 scsi_device_set_state(sdev, SDEV_QUIESCE);
651 return SPI_COMPARE_FAILURE;
652 }
653
654 /* If we don't have the inquiry data already, the
655 * first read gets it */
656 if (ptr == buffer) {
657 ptr += len;
658 --r;
659 continue;
660 }
661
662 if (memcmp(buffer, ptr, len) != 0)
663 /* failure */
664 return SPI_COMPARE_FAILURE;
665 }
666 return SPI_COMPARE_SUCCESS;
667 }
668
669 static enum spi_compare_returns
670 spi_dv_retrain(struct scsi_request *sreq, u8 *buffer, u8 *ptr,
671 enum spi_compare_returns
672 (*compare_fn)(struct scsi_request *, u8 *, u8 *, int))
673 {
674 struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt);
675 struct scsi_device *sdev = sreq->sr_device;
676 struct scsi_target *starget = sdev->sdev_target;
677 int period = 0, prevperiod = 0;
678 enum spi_compare_returns retval;
679
680
681 for (;;) {
682 int newperiod;
683 retval = compare_fn(sreq, buffer, ptr, DV_LOOPS);
684
685 if (retval == SPI_COMPARE_SUCCESS
686 || retval == SPI_COMPARE_SKIP_TEST)
687 break;
688
689 /* OK, retrain, fallback */
690 if (i->f->get_iu)
691 i->f->get_iu(starget);
692 if (i->f->get_qas)
693 i->f->get_qas(starget);
694 if (i->f->get_period)
695 i->f->get_period(sdev->sdev_target);
696
697 /* Here's the fallback sequence; first try turning off
698 * IU, then QAS (if we can control them), then finally
699 * fall down the periods */
700 if (i->f->set_iu && spi_iu(starget)) {
701 SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Information Units\n");
702 DV_SET(iu, 0);
703 } else if (i->f->set_qas && spi_qas(starget)) {
704 SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Quick Arbitration and Selection\n");
705 DV_SET(qas, 0);
706 } else {
707 newperiod = spi_period(starget);
708 period = newperiod > period ? newperiod : period;
709 if (period < 0x0d)
710 period++;
711 else
712 period += period >> 1;
713
714 if (unlikely(period > 0xff || period == prevperiod)) {
715 /* Total failure; set to async and return */
716 SPI_PRINTK(starget, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n");
717 DV_SET(offset, 0);
718 return SPI_COMPARE_FAILURE;
719 }
720 SPI_PRINTK(starget, KERN_ERR, "Domain Validation detected failure, dropping back\n");
721 DV_SET(period, period);
722 prevperiod = period;
723 }
724 }
725 return retval;
726 }
727
728 static int
729 spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer)
730 {
731 int l;
732
733 /* first off do a test unit ready. This can error out
734 * because of reservations or some other reason. If it
735 * fails, the device won't let us write to the echo buffer
736 * so just return failure */
737
738 const char spi_test_unit_ready[] = {
739 TEST_UNIT_READY, 0, 0, 0, 0, 0
740 };
741
742 const char spi_read_buffer_descriptor[] = {
743 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
744 };
745
746
747 sreq->sr_cmd_len = 0;
748 sreq->sr_data_direction = DMA_NONE;
749
750 /* We send a set of three TURs to clear any outstanding
751 * unit attention conditions if they exist (Otherwise the
752 * buffer tests won't be happy). If the TUR still fails
753 * (reservation conflict, device not ready, etc) just
754 * skip the write tests */
755 for (l = 0; ; l++) {
756 spi_wait_req(sreq, spi_test_unit_ready, NULL, 0);
757
758 if(sreq->sr_result) {
759 if(l >= 3)
760 return 0;
761 } else {
762 /* TUR succeeded */
763 break;
764 }
765 }
766
767 sreq->sr_cmd_len = 0;
768 sreq->sr_data_direction = DMA_FROM_DEVICE;
769
770 spi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4);
771
772 if (sreq->sr_result)
773 /* Device has no echo buffer */
774 return 0;
775
776 return buffer[3] + ((buffer[2] & 0x1f) << 8);
777 }
778
779 static void
780 spi_dv_device_internal(struct scsi_request *sreq, u8 *buffer)
781 {
782 struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt);
783 struct scsi_device *sdev = sreq->sr_device;
784 struct scsi_target *starget = sdev->sdev_target;
785 int len = sdev->inquiry_len;
786 /* first set us up for narrow async */
787 DV_SET(offset, 0);
788 DV_SET(width, 0);
789
790 if (spi_dv_device_compare_inquiry(sreq, buffer, buffer, DV_LOOPS)
791 != SPI_COMPARE_SUCCESS) {
792 SPI_PRINTK(starget, KERN_ERR, "Domain Validation Initial Inquiry Failed\n");
793 /* FIXME: should probably offline the device here? */
794 return;
795 }
796
797 /* test width */
798 if (i->f->set_width && spi_max_width(starget) &&
799 scsi_device_wide(sdev)) {
800 i->f->set_width(starget, 1);
801
802 if (spi_dv_device_compare_inquiry(sreq, buffer,
803 buffer + len,
804 DV_LOOPS)
805 != SPI_COMPARE_SUCCESS) {
806 SPI_PRINTK(starget, KERN_ERR, "Wide Transfers Fail\n");
807 i->f->set_width(starget, 0);
808 }
809 }
810
811 if (!i->f->set_period)
812 return;
813
814 /* device can't handle synchronous */
815 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
816 return;
817
818 /* see if the device has an echo buffer. If it does we can
819 * do the SPI pattern write tests */
820
821 len = 0;
822 if (scsi_device_dt(sdev))
823 len = spi_dv_device_get_echo_buffer(sreq, buffer);
824
825 retry:
826
827 /* now set up to the maximum */
828 DV_SET(offset, spi_max_offset(starget));
829 DV_SET(period, spi_min_period(starget));
830 /* try QAS requests; this should be harmless to set if the
831 * target supports it */
832 if (scsi_device_qas(sdev))
833 DV_SET(qas, 1);
834 /* Also try IU transfers */
835 if (scsi_device_ius(sdev))
836 DV_SET(iu, 1);
837 if (spi_min_period(starget) < 9) {
838 /* This u320 (or u640). Ignore the coupled parameters
839 * like DT and IU, but set the optional ones */
840 DV_SET(rd_strm, 1);
841 DV_SET(wr_flow, 1);
842 DV_SET(rti, 1);
843 if (spi_min_period(starget) == 8)
844 DV_SET(pcomp_en, 1);
845 }
846
847 if (len == 0) {
848 SPI_PRINTK(starget, KERN_INFO, "Domain Validation skipping write tests\n");
849 spi_dv_retrain(sreq, buffer, buffer + len,
850 spi_dv_device_compare_inquiry);
851 return;
852 }
853
854 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
855 SPI_PRINTK(starget, KERN_WARNING, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
856 len = SPI_MAX_ECHO_BUFFER_SIZE;
857 }
858
859 if (spi_dv_retrain(sreq, buffer, buffer + len,
860 spi_dv_device_echo_buffer)
861 == SPI_COMPARE_SKIP_TEST) {
862 /* OK, the stupid drive can't do a write echo buffer
863 * test after all, fall back to the read tests */
864 len = 0;
865 goto retry;
866 }
867 }
868
869
870 /** spi_dv_device - Do Domain Validation on the device
871 * @sdev: scsi device to validate
872 *
873 * Performs the domain validation on the given device in the
874 * current execution thread. Since DV operations may sleep,
875 * the current thread must have user context. Also no SCSI
876 * related locks that would deadlock I/O issued by the DV may
877 * be held.
878 */
879 void
880 spi_dv_device(struct scsi_device *sdev)
881 {
882 struct scsi_request *sreq = scsi_allocate_request(sdev, GFP_KERNEL);
883 struct scsi_target *starget = sdev->sdev_target;
884 u8 *buffer;
885 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
886
887 if (unlikely(!sreq))
888 return;
889
890 if (unlikely(scsi_device_get(sdev)))
891 goto out_free_req;
892
893 buffer = kmalloc(len, GFP_KERNEL);
894
895 if (unlikely(!buffer))
896 goto out_put;
897
898 memset(buffer, 0, len);
899
900 /* We need to verify that the actual device will quiesce; the
901 * later target quiesce is just a nice to have */
902 if (unlikely(scsi_device_quiesce(sdev)))
903 goto out_free;
904
905 scsi_target_quiesce(starget);
906
907 spi_dv_pending(starget) = 1;
908 down(&spi_dv_sem(starget));
909
910 SPI_PRINTK(starget, KERN_INFO, "Beginning Domain Validation\n");
911
912 spi_dv_device_internal(sreq, buffer);
913
914 SPI_PRINTK(starget, KERN_INFO, "Ending Domain Validation\n");
915
916 up(&spi_dv_sem(starget));
917 spi_dv_pending(starget) = 0;
918
919 scsi_target_resume(starget);
920
921 spi_initial_dv(starget) = 1;
922
923 out_free:
924 kfree(buffer);
925 out_put:
926 scsi_device_put(sdev);
927 out_free_req:
928 scsi_release_request(sreq);
929 }
930 EXPORT_SYMBOL(spi_dv_device);
931
932 struct work_queue_wrapper {
933 struct work_struct work;
934 struct scsi_device *sdev;
935 };
936
937 static void
938 spi_dv_device_work_wrapper(void *data)
939 {
940 struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
941 struct scsi_device *sdev = wqw->sdev;
942
943 kfree(wqw);
944 spi_dv_device(sdev);
945 spi_dv_pending(sdev->sdev_target) = 0;
946 scsi_device_put(sdev);
947 }
948
949
950 /**
951 * spi_schedule_dv_device - schedule domain validation to occur on the device
952 * @sdev: The device to validate
953 *
954 * Identical to spi_dv_device() above, except that the DV will be
955 * scheduled to occur in a workqueue later. All memory allocations
956 * are atomic, so may be called from any context including those holding
957 * SCSI locks.
958 */
959 void
960 spi_schedule_dv_device(struct scsi_device *sdev)
961 {
962 struct work_queue_wrapper *wqw =
963 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
964
965 if (unlikely(!wqw))
966 return;
967
968 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
969 kfree(wqw);
970 return;
971 }
972 /* Set pending early (dv_device doesn't check it, only sets it) */
973 spi_dv_pending(sdev->sdev_target) = 1;
974 if (unlikely(scsi_device_get(sdev))) {
975 kfree(wqw);
976 spi_dv_pending(sdev->sdev_target) = 0;
977 return;
978 }
979
980 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper, wqw);
981 wqw->sdev = sdev;
982
983 schedule_work(&wqw->work);
984 }
985 EXPORT_SYMBOL(spi_schedule_dv_device);
986
987 /**
988 * spi_display_xfer_agreement - Print the current target transfer agreement
989 * @starget: The target for which to display the agreement
990 *
991 * Each SPI port is required to maintain a transfer agreement for each
992 * other port on the bus. This function prints a one-line summary of
993 * the current agreement; more detailed information is available in sysfs.
994 */
995 void spi_display_xfer_agreement(struct scsi_target *starget)
996 {
997 struct spi_transport_attrs *tp;
998 tp = (struct spi_transport_attrs *)&starget->starget_data;
999
1000 if (tp->offset > 0 && tp->period > 0) {
1001 unsigned int picosec, kb100;
1002 char *scsi = "FAST-?";
1003 char tmp[8];
1004
1005 if (tp->period <= SPI_STATIC_PPR) {
1006 picosec = ppr_to_ps[tp->period];
1007 switch (tp->period) {
1008 case 7: scsi = "FAST-320"; break;
1009 case 8: scsi = "FAST-160"; break;
1010 case 9: scsi = "FAST-80"; break;
1011 case 10:
1012 case 11: scsi = "FAST-40"; break;
1013 case 12: scsi = "FAST-20"; break;
1014 }
1015 } else {
1016 picosec = tp->period * 4000;
1017 if (tp->period < 25)
1018 scsi = "FAST-20";
1019 else if (tp->period < 50)
1020 scsi = "FAST-10";
1021 else
1022 scsi = "FAST-5";
1023 }
1024
1025 kb100 = (10000000 + picosec / 2) / picosec;
1026 if (tp->width)
1027 kb100 *= 2;
1028 sprint_frac(tmp, picosec, 1000);
1029
1030 dev_info(&starget->dev,
1031 "%s %sSCSI %d.%d MB/s %s%s%s (%s ns, offset %d)\n",
1032 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1033 tp->dt ? "DT" : "ST", tp->iu ? " IU" : "",
1034 tp->qas ? " QAS" : "", tmp, tp->offset);
1035 } else {
1036 dev_info(&starget->dev, "%sasynchronous.\n",
1037 tp->width ? "wide " : "");
1038 }
1039 }
1040 EXPORT_SYMBOL(spi_display_xfer_agreement);
1041
1042 #define SETUP_ATTRIBUTE(field) \
1043 i->private_attrs[count] = class_device_attr_##field; \
1044 if (!i->f->set_##field) { \
1045 i->private_attrs[count].attr.mode = S_IRUGO; \
1046 i->private_attrs[count].store = NULL; \
1047 } \
1048 i->attrs[count] = &i->private_attrs[count]; \
1049 if (i->f->show_##field) \
1050 count++
1051
1052 #define SETUP_RELATED_ATTRIBUTE(field, rel_field) \
1053 i->private_attrs[count] = class_device_attr_##field; \
1054 if (!i->f->set_##rel_field) { \
1055 i->private_attrs[count].attr.mode = S_IRUGO; \
1056 i->private_attrs[count].store = NULL; \
1057 } \
1058 i->attrs[count] = &i->private_attrs[count]; \
1059 if (i->f->show_##rel_field) \
1060 count++
1061
1062 #define SETUP_HOST_ATTRIBUTE(field) \
1063 i->private_host_attrs[count] = class_device_attr_##field; \
1064 if (!i->f->set_##field) { \
1065 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1066 i->private_host_attrs[count].store = NULL; \
1067 } \
1068 i->host_attrs[count] = &i->private_host_attrs[count]; \
1069 count++
1070
1071 static int spi_device_match(struct attribute_container *cont,
1072 struct device *dev)
1073 {
1074 struct scsi_device *sdev;
1075 struct Scsi_Host *shost;
1076
1077 if (!scsi_is_sdev_device(dev))
1078 return 0;
1079
1080 sdev = to_scsi_device(dev);
1081 shost = sdev->host;
1082 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1083 != &spi_host_class.class)
1084 return 0;
1085 /* Note: this class has no device attributes, so it has
1086 * no per-HBA allocation and thus we don't need to distinguish
1087 * the attribute containers for the device */
1088 return 1;
1089 }
1090
1091 static int spi_target_match(struct attribute_container *cont,
1092 struct device *dev)
1093 {
1094 struct Scsi_Host *shost;
1095 struct spi_internal *i;
1096
1097 if (!scsi_is_target_device(dev))
1098 return 0;
1099
1100 shost = dev_to_shost(dev->parent);
1101 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1102 != &spi_host_class.class)
1103 return 0;
1104
1105 i = to_spi_internal(shost->transportt);
1106
1107 return &i->t.target_attrs.ac == cont;
1108 }
1109
1110 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1111 "spi_transport",
1112 spi_setup_transport_attrs,
1113 NULL,
1114 NULL);
1115
1116 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1117 spi_device_match,
1118 spi_device_configure);
1119
1120 struct scsi_transport_template *
1121 spi_attach_transport(struct spi_function_template *ft)
1122 {
1123 struct spi_internal *i = kmalloc(sizeof(struct spi_internal),
1124 GFP_KERNEL);
1125 int count = 0;
1126 if (unlikely(!i))
1127 return NULL;
1128
1129 memset(i, 0, sizeof(struct spi_internal));
1130
1131
1132 i->t.target_attrs.ac.class = &spi_transport_class.class;
1133 i->t.target_attrs.ac.attrs = &i->attrs[0];
1134 i->t.target_attrs.ac.match = spi_target_match;
1135 transport_container_register(&i->t.target_attrs);
1136 i->t.target_size = sizeof(struct spi_transport_attrs);
1137 i->t.host_attrs.ac.class = &spi_host_class.class;
1138 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1139 i->t.host_attrs.ac.match = spi_host_match;
1140 transport_container_register(&i->t.host_attrs);
1141 i->t.host_size = sizeof(struct spi_host_attrs);
1142 i->f = ft;
1143
1144 SETUP_ATTRIBUTE(period);
1145 SETUP_RELATED_ATTRIBUTE(min_period, period);
1146 SETUP_ATTRIBUTE(offset);
1147 SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1148 SETUP_ATTRIBUTE(width);
1149 SETUP_RELATED_ATTRIBUTE(max_width, width);
1150 SETUP_ATTRIBUTE(iu);
1151 SETUP_ATTRIBUTE(dt);
1152 SETUP_ATTRIBUTE(qas);
1153 SETUP_ATTRIBUTE(wr_flow);
1154 SETUP_ATTRIBUTE(rd_strm);
1155 SETUP_ATTRIBUTE(rti);
1156 SETUP_ATTRIBUTE(pcomp_en);
1157
1158 /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1159 * this bug will trigger */
1160 BUG_ON(count > SPI_NUM_ATTRS);
1161
1162 i->attrs[count++] = &class_device_attr_revalidate;
1163
1164 i->attrs[count] = NULL;
1165
1166 count = 0;
1167 SETUP_HOST_ATTRIBUTE(signalling);
1168
1169 BUG_ON(count > SPI_HOST_ATTRS);
1170
1171 i->host_attrs[count] = NULL;
1172
1173 return &i->t;
1174 }
1175 EXPORT_SYMBOL(spi_attach_transport);
1176
1177 void spi_release_transport(struct scsi_transport_template *t)
1178 {
1179 struct spi_internal *i = to_spi_internal(t);
1180
1181 transport_container_unregister(&i->t.target_attrs);
1182 transport_container_unregister(&i->t.host_attrs);
1183
1184 kfree(i);
1185 }
1186 EXPORT_SYMBOL(spi_release_transport);
1187
1188 static __init int spi_transport_init(void)
1189 {
1190 int error = transport_class_register(&spi_transport_class);
1191 if (error)
1192 return error;
1193 error = anon_transport_class_register(&spi_device_class);
1194 return transport_class_register(&spi_host_class);
1195 }
1196
1197 static void __exit spi_transport_exit(void)
1198 {
1199 transport_class_unregister(&spi_transport_class);
1200 anon_transport_class_unregister(&spi_device_class);
1201 transport_class_unregister(&spi_host_class);
1202 }
1203
1204 MODULE_AUTHOR("Martin Hicks");
1205 MODULE_DESCRIPTION("SPI Transport Attributes");
1206 MODULE_LICENSE("GPL");
1207
1208 module_init(spi_transport_init);
1209 module_exit(spi_transport_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree