?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[SCSI] scsi_transport_spi: fix oops in revalidate
[linux-2.6/sactl.git] / drivers / scsi / scsi_transport_spi.c
blobb29360ed0bdc9f0c2dd6a80c06cd4ef09a5cee66
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 <linux/mutex.h>
27 #include <linux/sysfs.h>
28 #include <scsi/scsi.h>
29 #include "scsi_priv.h"
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_spi.h>
36
37 #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */
38 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
39 * on" attributes */
40 #define SPI_HOST_ATTRS 1
41
42 #define SPI_MAX_ECHO_BUFFER_SIZE 4096
43
44 #define DV_LOOPS 3
45 #define DV_TIMEOUT (10*HZ)
46 #define DV_RETRIES 3 /* should only need at most
47 * two cc/ua clears */
48
49 /* Private data accessors (keep these out of the header file) */
50 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
52
53 struct spi_internal {
54 struct scsi_transport_template t;
55 struct spi_function_template *f;
56 };
57
58 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
59
60 static const int ppr_to_ps[] = {
61 /* The PPR values 0-6 are reserved, fill them in when
62 * the committee defines them */
63 -1, /* 0x00 */
64 -1, /* 0x01 */
65 -1, /* 0x02 */
66 -1, /* 0x03 */
67 -1, /* 0x04 */
68 -1, /* 0x05 */
69 -1, /* 0x06 */
70 3125, /* 0x07 */
71 6250, /* 0x08 */
72 12500, /* 0x09 */
73 25000, /* 0x0a */
74 30300, /* 0x0b */
75 50000, /* 0x0c */
76 };
77 /* The PPR values at which you calculate the period in ns by multiplying
78 * by 4 */
79 #define SPI_STATIC_PPR 0x0c
80
81 static int sprint_frac(char *dest, int value, int denom)
82 {
83 int frac = value % denom;
84 int result = sprintf(dest, "%d", value / denom);
85
86 if (frac == 0)
87 return result;
88 dest[result++] = '.';
89
90 do {
91 denom /= 10;
92 sprintf(dest + result, "%d", frac / denom);
93 result++;
94 frac %= denom;
95 } while (frac);
96
97 dest[result++] = '\0';
98 return result;
99 }
100
101 static int spi_execute(struct scsi_device *sdev, const void *cmd,
102 enum dma_data_direction dir,
103 void *buffer, unsigned bufflen,
104 struct scsi_sense_hdr *sshdr)
105 {
106 int i, result;
107 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
108
109 for(i = 0; i < DV_RETRIES; i++) {
110 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
111 sense, DV_TIMEOUT, /* retries */ 1,
112 REQ_FAILFAST);
113 if (result & DRIVER_SENSE) {
114 struct scsi_sense_hdr sshdr_tmp;
115 if (!sshdr)
116 sshdr = &sshdr_tmp;
117
118 if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
119 sshdr)
120 && sshdr->sense_key == UNIT_ATTENTION)
121 continue;
122 }
123 break;
124 }
125 return result;
126 }
127
128 static struct {
129 enum spi_signal_type value;
130 char *name;
131 } signal_types[] = {
132 { SPI_SIGNAL_UNKNOWN, "unknown" },
133 { SPI_SIGNAL_SE, "SE" },
134 { SPI_SIGNAL_LVD, "LVD" },
135 { SPI_SIGNAL_HVD, "HVD" },
136 };
137
138 static inline const char *spi_signal_to_string(enum spi_signal_type type)
139 {
140 int i;
141
142 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
143 if (type == signal_types[i].value)
144 return signal_types[i].name;
145 }
146 return NULL;
147 }
148 static inline enum spi_signal_type spi_signal_to_value(const char *name)
149 {
150 int i, len;
151
152 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
153 len = strlen(signal_types[i].name);
154 if (strncmp(name, signal_types[i].name, len) == 0 &&
155 (name[len] == '\n' || name[len] == '\0'))
156 return signal_types[i].value;
157 }
158 return SPI_SIGNAL_UNKNOWN;
159 }
160
161 static int spi_host_setup(struct transport_container *tc, struct device *dev,
162 struct device *cdev)
163 {
164 struct Scsi_Host *shost = dev_to_shost(dev);
165
166 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
167
168 return 0;
169 }
170
171 static int spi_host_configure(struct transport_container *tc,
172 struct device *dev,
173 struct device *cdev);
174
175 static DECLARE_TRANSPORT_CLASS(spi_host_class,
176 "spi_host",
177 spi_host_setup,
178 NULL,
179 spi_host_configure);
180
181 static int spi_host_match(struct attribute_container *cont,
182 struct device *dev)
183 {
184 struct Scsi_Host *shost;
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 return &shost->transportt->host_attrs.ac == cont;
195 }
196
197 static int spi_target_configure(struct transport_container *tc,
198 struct device *dev,
199 struct device *cdev);
200
201 static int spi_device_configure(struct transport_container *tc,
202 struct device *dev,
203 struct device *cdev)
204 {
205 struct scsi_device *sdev = to_scsi_device(dev);
206 struct scsi_target *starget = sdev->sdev_target;
207
208 /* Populate the target capability fields with the values
209 * gleaned from the device inquiry */
210
211 spi_support_sync(starget) = scsi_device_sync(sdev);
212 spi_support_wide(starget) = scsi_device_wide(sdev);
213 spi_support_dt(starget) = scsi_device_dt(sdev);
214 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
215 spi_support_ius(starget) = scsi_device_ius(sdev);
216 spi_support_qas(starget) = scsi_device_qas(sdev);
217
218 return 0;
219 }
220
221 static int spi_setup_transport_attrs(struct transport_container *tc,
222 struct device *dev,
223 struct device *cdev)
224 {
225 struct scsi_target *starget = to_scsi_target(dev);
226
227 spi_period(starget) = -1; /* illegal value */
228 spi_min_period(starget) = 0;
229 spi_offset(starget) = 0; /* async */
230 spi_max_offset(starget) = 255;
231 spi_width(starget) = 0; /* narrow */
232 spi_max_width(starget) = 1;
233 spi_iu(starget) = 0; /* no IU */
234 spi_dt(starget) = 0; /* ST */
235 spi_qas(starget) = 0;
236 spi_wr_flow(starget) = 0;
237 spi_rd_strm(starget) = 0;
238 spi_rti(starget) = 0;
239 spi_pcomp_en(starget) = 0;
240 spi_hold_mcs(starget) = 0;
241 spi_dv_pending(starget) = 0;
242 spi_dv_in_progress(starget) = 0;
243 spi_initial_dv(starget) = 0;
244 mutex_init(&spi_dv_mutex(starget));
245
246 return 0;
247 }
248
249 #define spi_transport_show_simple(field, format_string) \
250 \
251 static ssize_t \
252 show_spi_transport_##field(struct device *dev, \
253 struct device_attribute *attr, char *buf) \
254 { \
255 struct scsi_target *starget = transport_class_to_starget(dev); \
256 struct spi_transport_attrs *tp; \
257 \
258 tp = (struct spi_transport_attrs *)&starget->starget_data; \
259 return snprintf(buf, 20, format_string, tp->field); \
260 }
261
262 #define spi_transport_store_simple(field, format_string) \
263 \
264 static ssize_t \
265 store_spi_transport_##field(struct device *dev, \
266 struct device_attribute *attr, \
267 const char *buf, size_t count) \
268 { \
269 int val; \
270 struct scsi_target *starget = transport_class_to_starget(dev); \
271 struct spi_transport_attrs *tp; \
272 \
273 tp = (struct spi_transport_attrs *)&starget->starget_data; \
274 val = simple_strtoul(buf, NULL, 0); \
275 tp->field = val; \
276 return count; \
277 }
278
279 #define spi_transport_show_function(field, format_string) \
280 \
281 static ssize_t \
282 show_spi_transport_##field(struct device *dev, \
283 struct device_attribute *attr, char *buf) \
284 { \
285 struct scsi_target *starget = transport_class_to_starget(dev); \
286 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
287 struct spi_transport_attrs *tp; \
288 struct spi_internal *i = to_spi_internal(shost->transportt); \
289 tp = (struct spi_transport_attrs *)&starget->starget_data; \
290 if (i->f->get_##field) \
291 i->f->get_##field(starget); \
292 return snprintf(buf, 20, format_string, tp->field); \
293 }
294
295 #define spi_transport_store_function(field, format_string) \
296 static ssize_t \
297 store_spi_transport_##field(struct device *dev, \
298 struct device_attribute *attr, \
299 const char *buf, size_t count) \
300 { \
301 int val; \
302 struct scsi_target *starget = transport_class_to_starget(dev); \
303 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
304 struct spi_internal *i = to_spi_internal(shost->transportt); \
305 \
306 if (!i->f->set_##field) \
307 return -EINVAL; \
308 val = simple_strtoul(buf, NULL, 0); \
309 i->f->set_##field(starget, val); \
310 return count; \
311 }
312
313 #define spi_transport_store_max(field, format_string) \
314 static ssize_t \
315 store_spi_transport_##field(struct device *dev, \
316 struct device_attribute *attr, \
317 const char *buf, size_t count) \
318 { \
319 int val; \
320 struct scsi_target *starget = transport_class_to_starget(dev); \
321 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
322 struct spi_internal *i = to_spi_internal(shost->transportt); \
323 struct spi_transport_attrs *tp \
324 = (struct spi_transport_attrs *)&starget->starget_data; \
325 \
326 if (i->f->set_##field) \
327 return -EINVAL; \
328 val = simple_strtoul(buf, NULL, 0); \
329 if (val > tp->max_##field) \
330 val = tp->max_##field; \
331 i->f->set_##field(starget, val); \
332 return count; \
333 }
334
335 #define spi_transport_rd_attr(field, format_string) \
336 spi_transport_show_function(field, format_string) \
337 spi_transport_store_function(field, format_string) \
338 static DEVICE_ATTR(field, S_IRUGO, \
339 show_spi_transport_##field, \
340 store_spi_transport_##field);
341
342 #define spi_transport_simple_attr(field, format_string) \
343 spi_transport_show_simple(field, format_string) \
344 spi_transport_store_simple(field, format_string) \
345 static DEVICE_ATTR(field, S_IRUGO, \
346 show_spi_transport_##field, \
347 store_spi_transport_##field);
348
349 #define spi_transport_max_attr(field, format_string) \
350 spi_transport_show_function(field, format_string) \
351 spi_transport_store_max(field, format_string) \
352 spi_transport_simple_attr(max_##field, format_string) \
353 static DEVICE_ATTR(field, S_IRUGO, \
354 show_spi_transport_##field, \
355 store_spi_transport_##field);
356
357 /* The Parallel SCSI Tranport Attributes: */
358 spi_transport_max_attr(offset, "%d\n");
359 spi_transport_max_attr(width, "%d\n");
360 spi_transport_rd_attr(iu, "%d\n");
361 spi_transport_rd_attr(dt, "%d\n");
362 spi_transport_rd_attr(qas, "%d\n");
363 spi_transport_rd_attr(wr_flow, "%d\n");
364 spi_transport_rd_attr(rd_strm, "%d\n");
365 spi_transport_rd_attr(rti, "%d\n");
366 spi_transport_rd_attr(pcomp_en, "%d\n");
367 spi_transport_rd_attr(hold_mcs, "%d\n");
368
369 /* we only care about the first child device that's a real SCSI device
370 * so we return 1 to terminate the iteration when we find it */
371 static int child_iter(struct device *dev, void *data)
372 {
373 if (!scsi_is_sdev_device(dev))
374 return 0;
375
376 spi_dv_device(to_scsi_device(dev));
377 return 1;
378 }
379
380 static ssize_t
381 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
382 const char *buf, size_t count)
383 {
384 struct scsi_target *starget = transport_class_to_starget(dev);
385
386 device_for_each_child(&starget->dev, NULL, child_iter);
387 return count;
388 }
389 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
390
391 /* Translate the period into ns according to the current spec
392 * for SDTR/PPR messages */
393 static int period_to_str(char *buf, int period)
394 {
395 int len, picosec;
396
397 if (period < 0 || period > 0xff) {
398 picosec = -1;
399 } else if (period <= SPI_STATIC_PPR) {
400 picosec = ppr_to_ps[period];
401 } else {
402 picosec = period * 4000;
403 }
404
405 if (picosec == -1) {
406 len = sprintf(buf, "reserved");
407 } else {
408 len = sprint_frac(buf, picosec, 1000);
409 }
410
411 return len;
412 }
413
414 static ssize_t
415 show_spi_transport_period_helper(char *buf, int period)
416 {
417 int len = period_to_str(buf, period);
418 buf[len++] = '\n';
419 buf[len] = '\0';
420 return len;
421 }
422
423 static ssize_t
424 store_spi_transport_period_helper(struct device *dev, const char *buf,
425 size_t count, int *periodp)
426 {
427 int j, picosec, period = -1;
428 char *endp;
429
430 picosec = simple_strtoul(buf, &endp, 10) * 1000;
431 if (*endp == '.') {
432 int mult = 100;
433 do {
434 endp++;
435 if (!isdigit(*endp))
436 break;
437 picosec += (*endp - '0') * mult;
438 mult /= 10;
439 } while (mult > 0);
440 }
441
442 for (j = 0; j <= SPI_STATIC_PPR; j++) {
443 if (ppr_to_ps[j] < picosec)
444 continue;
445 period = j;
446 break;
447 }
448
449 if (period == -1)
450 period = picosec / 4000;
451
452 if (period > 0xff)
453 period = 0xff;
454
455 *periodp = period;
456
457 return count;
458 }
459
460 static ssize_t
461 show_spi_transport_period(struct device *dev,
462 struct device_attribute *attr, char *buf)
463 {
464 struct scsi_target *starget = transport_class_to_starget(dev);
465 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
466 struct spi_internal *i = to_spi_internal(shost->transportt);
467 struct spi_transport_attrs *tp =
468 (struct spi_transport_attrs *)&starget->starget_data;
469
470 if (i->f->get_period)
471 i->f->get_period(starget);
472
473 return show_spi_transport_period_helper(buf, tp->period);
474 }
475
476 static ssize_t
477 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
478 const char *buf, size_t count)
479 {
480 struct scsi_target *starget = transport_class_to_starget(cdev);
481 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
482 struct spi_internal *i = to_spi_internal(shost->transportt);
483 struct spi_transport_attrs *tp =
484 (struct spi_transport_attrs *)&starget->starget_data;
485 int period, retval;
486
487 if (!i->f->set_period)
488 return -EINVAL;
489
490 retval = store_spi_transport_period_helper(cdev, buf, count, &period);
491
492 if (period < tp->min_period)
493 period = tp->min_period;
494
495 i->f->set_period(starget, period);
496
497 return retval;
498 }
499
500 static DEVICE_ATTR(period, S_IRUGO,
501 show_spi_transport_period,
502 store_spi_transport_period);
503
504 static ssize_t
505 show_spi_transport_min_period(struct device *cdev,
506 struct device_attribute *attr, char *buf)
507 {
508 struct scsi_target *starget = transport_class_to_starget(cdev);
509 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
510 struct spi_internal *i = to_spi_internal(shost->transportt);
511 struct spi_transport_attrs *tp =
512 (struct spi_transport_attrs *)&starget->starget_data;
513
514 if (!i->f->set_period)
515 return -EINVAL;
516
517 return show_spi_transport_period_helper(buf, tp->min_period);
518 }
519
520 static ssize_t
521 store_spi_transport_min_period(struct device *cdev,
522 struct device_attribute *attr,
523 const char *buf, size_t count)
524 {
525 struct scsi_target *starget = transport_class_to_starget(cdev);
526 struct spi_transport_attrs *tp =
527 (struct spi_transport_attrs *)&starget->starget_data;
528
529 return store_spi_transport_period_helper(cdev, buf, count,
530 &tp->min_period);
531 }
532
533
534 static DEVICE_ATTR(min_period, S_IRUGO,
535 show_spi_transport_min_period,
536 store_spi_transport_min_period);
537
538
539 static ssize_t show_spi_host_signalling(struct device *cdev,
540 struct device_attribute *attr,
541 char *buf)
542 {
543 struct Scsi_Host *shost = transport_class_to_shost(cdev);
544 struct spi_internal *i = to_spi_internal(shost->transportt);
545
546 if (i->f->get_signalling)
547 i->f->get_signalling(shost);
548
549 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
550 }
551 static ssize_t store_spi_host_signalling(struct device *dev,
552 struct device_attribute *attr,
553 const char *buf, size_t count)
554 {
555 struct Scsi_Host *shost = transport_class_to_shost(dev);
556 struct spi_internal *i = to_spi_internal(shost->transportt);
557 enum spi_signal_type type = spi_signal_to_value(buf);
558
559 if (!i->f->set_signalling)
560 return -EINVAL;
561
562 if (type != SPI_SIGNAL_UNKNOWN)
563 i->f->set_signalling(shost, type);
564
565 return count;
566 }
567 static DEVICE_ATTR(signalling, S_IRUGO,
568 show_spi_host_signalling,
569 store_spi_host_signalling);
570
571 #define DV_SET(x, y) \
572 if(i->f->set_##x) \
573 i->f->set_##x(sdev->sdev_target, y)
574
575 enum spi_compare_returns {
576 SPI_COMPARE_SUCCESS,
577 SPI_COMPARE_FAILURE,
578 SPI_COMPARE_SKIP_TEST,
579 };
580
581
582 /* This is for read/write Domain Validation: If the device supports
583 * an echo buffer, we do read/write tests to it */
584 static enum spi_compare_returns
585 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
586 u8 *ptr, const int retries)
587 {
588 int len = ptr - buffer;
589 int j, k, r, result;
590 unsigned int pattern = 0x0000ffff;
591 struct scsi_sense_hdr sshdr;
592
593 const char spi_write_buffer[] = {
594 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
595 };
596 const char spi_read_buffer[] = {
597 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
598 };
599
600 /* set up the pattern buffer. Doesn't matter if we spill
601 * slightly beyond since that's where the read buffer is */
602 for (j = 0; j < len; ) {
603
604 /* fill the buffer with counting (test a) */
605 for ( ; j < min(len, 32); j++)
606 buffer[j] = j;
607 k = j;
608 /* fill the buffer with alternating words of 0x0 and
609 * 0xffff (test b) */
610 for ( ; j < min(len, k + 32); j += 2) {
611 u16 *word = (u16 *)&buffer[j];
612
613 *word = (j & 0x02) ? 0x0000 : 0xffff;
614 }
615 k = j;
616 /* fill with crosstalk (alternating 0x5555 0xaaa)
617 * (test c) */
618 for ( ; j < min(len, k + 32); j += 2) {
619 u16 *word = (u16 *)&buffer[j];
620
621 *word = (j & 0x02) ? 0x5555 : 0xaaaa;
622 }
623 k = j;
624 /* fill with shifting bits (test d) */
625 for ( ; j < min(len, k + 32); j += 4) {
626 u32 *word = (unsigned int *)&buffer[j];
627 u32 roll = (pattern & 0x80000000) ? 1 : 0;
628
629 *word = pattern;
630 pattern = (pattern << 1) | roll;
631 }
632 /* don't bother with random data (test e) */
633 }
634
635 for (r = 0; r < retries; r++) {
636 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
637 buffer, len, &sshdr);
638 if(result || !scsi_device_online(sdev)) {
639
640 scsi_device_set_state(sdev, SDEV_QUIESCE);
641 if (scsi_sense_valid(&sshdr)
642 && sshdr.sense_key == ILLEGAL_REQUEST
643 /* INVALID FIELD IN CDB */
644 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
645 /* This would mean that the drive lied
646 * to us about supporting an echo
647 * buffer (unfortunately some Western
648 * Digital drives do precisely this)
649 */
650 return SPI_COMPARE_SKIP_TEST;
651
652
653 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
654 return SPI_COMPARE_FAILURE;
655 }
656
657 memset(ptr, 0, len);
658 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
659 ptr, len, NULL);
660 scsi_device_set_state(sdev, SDEV_QUIESCE);
661
662 if (memcmp(buffer, ptr, len) != 0)
663 return SPI_COMPARE_FAILURE;
664 }
665 return SPI_COMPARE_SUCCESS;
666 }
667
668 /* This is for the simplest form of Domain Validation: a read test
669 * on the inquiry data from the device */
670 static enum spi_compare_returns
671 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
672 u8 *ptr, const int retries)
673 {
674 int r, result;
675 const int len = sdev->inquiry_len;
676 const char spi_inquiry[] = {
677 INQUIRY, 0, 0, 0, len, 0
678 };
679
680 for (r = 0; r < retries; r++) {
681 memset(ptr, 0, len);
682
683 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
684 ptr, len, NULL);
685
686 if(result || !scsi_device_online(sdev)) {
687 scsi_device_set_state(sdev, SDEV_QUIESCE);
688 return SPI_COMPARE_FAILURE;
689 }
690
691 /* If we don't have the inquiry data already, the
692 * first read gets it */
693 if (ptr == buffer) {
694 ptr += len;
695 --r;
696 continue;
697 }
698
699 if (memcmp(buffer, ptr, len) != 0)
700 /* failure */
701 return SPI_COMPARE_FAILURE;
702 }
703 return SPI_COMPARE_SUCCESS;
704 }
705
706 static enum spi_compare_returns
707 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
708 enum spi_compare_returns
709 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
710 {
711 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
712 struct scsi_target *starget = sdev->sdev_target;
713 int period = 0, prevperiod = 0;
714 enum spi_compare_returns retval;
715
716
717 for (;;) {
718 int newperiod;
719 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
720
721 if (retval == SPI_COMPARE_SUCCESS
722 || retval == SPI_COMPARE_SKIP_TEST)
723 break;
724
725 /* OK, retrain, fallback */
726 if (i->f->get_iu)
727 i->f->get_iu(starget);
728 if (i->f->get_qas)
729 i->f->get_qas(starget);
730 if (i->f->get_period)
731 i->f->get_period(sdev->sdev_target);
732
733 /* Here's the fallback sequence; first try turning off
734 * IU, then QAS (if we can control them), then finally
735 * fall down the periods */
736 if (i->f->set_iu && spi_iu(starget)) {
737 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
738 DV_SET(iu, 0);
739 } else if (i->f->set_qas && spi_qas(starget)) {
740 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
741 DV_SET(qas, 0);
742 } else {
743 newperiod = spi_period(starget);
744 period = newperiod > period ? newperiod : period;
745 if (period < 0x0d)
746 period++;
747 else
748 period += period >> 1;
749
750 if (unlikely(period > 0xff || period == prevperiod)) {
751 /* Total failure; set to async and return */
752 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
753 DV_SET(offset, 0);
754 return SPI_COMPARE_FAILURE;
755 }
756 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
757 DV_SET(period, period);
758 prevperiod = period;
759 }
760 }
761 return retval;
762 }
763
764 static int
765 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
766 {
767 int l, result;
768
769 /* first off do a test unit ready. This can error out
770 * because of reservations or some other reason. If it
771 * fails, the device won't let us write to the echo buffer
772 * so just return failure */
773
774 const char spi_test_unit_ready[] = {
775 TEST_UNIT_READY, 0, 0, 0, 0, 0
776 };
777
778 const char spi_read_buffer_descriptor[] = {
779 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
780 };
781
782
783 /* We send a set of three TURs to clear any outstanding
784 * unit attention conditions if they exist (Otherwise the
785 * buffer tests won't be happy). If the TUR still fails
786 * (reservation conflict, device not ready, etc) just
787 * skip the write tests */
788 for (l = 0; ; l++) {
789 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
790 NULL, 0, NULL);
791
792 if(result) {
793 if(l >= 3)
794 return 0;
795 } else {
796 /* TUR succeeded */
797 break;
798 }
799 }
800
801 result = spi_execute(sdev, spi_read_buffer_descriptor,
802 DMA_FROM_DEVICE, buffer, 4, NULL);
803
804 if (result)
805 /* Device has no echo buffer */
806 return 0;
807
808 return buffer[3] + ((buffer[2] & 0x1f) << 8);
809 }
810
811 static void
812 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
813 {
814 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
815 struct scsi_target *starget = sdev->sdev_target;
816 struct Scsi_Host *shost = sdev->host;
817 int len = sdev->inquiry_len;
818 int min_period = spi_min_period(starget);
819 int max_width = spi_max_width(starget);
820 /* first set us up for narrow async */
821 DV_SET(offset, 0);
822 DV_SET(width, 0);
823
824 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
825 != SPI_COMPARE_SUCCESS) {
826 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
827 /* FIXME: should probably offline the device here? */
828 return;
829 }
830
831 if (!scsi_device_wide(sdev)) {
832 spi_max_width(starget) = 0;
833 max_width = 0;
834 }
835
836 /* test width */
837 if (i->f->set_width && max_width) {
838 i->f->set_width(starget, 1);
839
840 if (spi_dv_device_compare_inquiry(sdev, buffer,
841 buffer + len,
842 DV_LOOPS)
843 != SPI_COMPARE_SUCCESS) {
844 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
845 i->f->set_width(starget, 0);
846 /* Make sure we don't force wide back on by asking
847 * for a transfer period that requires it */
848 max_width = 0;
849 if (min_period < 10)
850 min_period = 10;
851 }
852 }
853
854 if (!i->f->set_period)
855 return;
856
857 /* device can't handle synchronous */
858 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
859 return;
860
861 /* len == -1 is the signal that we need to ascertain the
862 * presence of an echo buffer before trying to use it. len ==
863 * 0 means we don't have an echo buffer */
864 len = -1;
865
866 retry:
867
868 /* now set up to the maximum */
869 DV_SET(offset, spi_max_offset(starget));
870 DV_SET(period, min_period);
871
872 /* try QAS requests; this should be harmless to set if the
873 * target supports it */
874 if (scsi_device_qas(sdev)) {
875 DV_SET(qas, 1);
876 } else {
877 DV_SET(qas, 0);
878 }
879
880 if (scsi_device_ius(sdev) && min_period < 9) {
881 /* This u320 (or u640). Set IU transfers */
882 DV_SET(iu, 1);
883 /* Then set the optional parameters */
884 DV_SET(rd_strm, 1);
885 DV_SET(wr_flow, 1);
886 DV_SET(rti, 1);
887 if (min_period == 8)
888 DV_SET(pcomp_en, 1);
889 } else {
890 DV_SET(iu, 0);
891 }
892
893 /* now that we've done all this, actually check the bus
894 * signal type (if known). Some devices are stupid on
895 * a SE bus and still claim they can try LVD only settings */
896 if (i->f->get_signalling)
897 i->f->get_signalling(shost);
898 if (spi_signalling(shost) == SPI_SIGNAL_SE ||
899 spi_signalling(shost) == SPI_SIGNAL_HVD ||
900 !scsi_device_dt(sdev)) {
901 DV_SET(dt, 0);
902 } else {
903 DV_SET(dt, 1);
904 }
905 /* set width last because it will pull all the other
906 * parameters down to required values */
907 DV_SET(width, max_width);
908
909 /* Do the read only INQUIRY tests */
910 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
911 spi_dv_device_compare_inquiry);
912 /* See if we actually managed to negotiate and sustain DT */
913 if (i->f->get_dt)
914 i->f->get_dt(starget);
915
916 /* see if the device has an echo buffer. If it does we can do
917 * the SPI pattern write tests. Because of some broken
918 * devices, we *only* try this on a device that has actually
919 * negotiated DT */
920
921 if (len == -1 && spi_dt(starget))
922 len = spi_dv_device_get_echo_buffer(sdev, buffer);
923
924 if (len <= 0) {
925 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
926 return;
927 }
928
929 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
930 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
931 len = SPI_MAX_ECHO_BUFFER_SIZE;
932 }
933
934 if (spi_dv_retrain(sdev, buffer, buffer + len,
935 spi_dv_device_echo_buffer)
936 == SPI_COMPARE_SKIP_TEST) {
937 /* OK, the stupid drive can't do a write echo buffer
938 * test after all, fall back to the read tests */
939 len = 0;
940 goto retry;
941 }
942 }
943
944
945 /** spi_dv_device - Do Domain Validation on the device
946 * @sdev: scsi device to validate
947 *
948 * Performs the domain validation on the given device in the
949 * current execution thread. Since DV operations may sleep,
950 * the current thread must have user context. Also no SCSI
951 * related locks that would deadlock I/O issued by the DV may
952 * be held.
953 */
954 void
955 spi_dv_device(struct scsi_device *sdev)
956 {
957 struct scsi_target *starget = sdev->sdev_target;
958 u8 *buffer;
959 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
960
961 if (unlikely(scsi_device_get(sdev)))
962 return;
963
964 if (unlikely(spi_dv_in_progress(starget)))
965 return;
966 spi_dv_in_progress(starget) = 1;
967
968 buffer = kzalloc(len, GFP_KERNEL);
969
970 if (unlikely(!buffer))
971 goto out_put;
972
973 /* We need to verify that the actual device will quiesce; the
974 * later target quiesce is just a nice to have */
975 if (unlikely(scsi_device_quiesce(sdev)))
976 goto out_free;
977
978 scsi_target_quiesce(starget);
979
980 spi_dv_pending(starget) = 1;
981 mutex_lock(&spi_dv_mutex(starget));
982
983 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
984
985 spi_dv_device_internal(sdev, buffer);
986
987 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
988
989 mutex_unlock(&spi_dv_mutex(starget));
990 spi_dv_pending(starget) = 0;
991
992 scsi_target_resume(starget);
993
994 spi_initial_dv(starget) = 1;
995
996 out_free:
997 kfree(buffer);
998 out_put:
999 spi_dv_in_progress(starget) = 0;
1000 scsi_device_put(sdev);
1001 }
1002 EXPORT_SYMBOL(spi_dv_device);
1003
1004 struct work_queue_wrapper {
1005 struct work_struct work;
1006 struct scsi_device *sdev;
1007 };
1008
1009 static void
1010 spi_dv_device_work_wrapper(struct work_struct *work)
1011 {
1012 struct work_queue_wrapper *wqw =
1013 container_of(work, struct work_queue_wrapper, work);
1014 struct scsi_device *sdev = wqw->sdev;
1015
1016 kfree(wqw);
1017 spi_dv_device(sdev);
1018 spi_dv_pending(sdev->sdev_target) = 0;
1019 scsi_device_put(sdev);
1020 }
1021
1022
1023 /**
1024 * spi_schedule_dv_device - schedule domain validation to occur on the device
1025 * @sdev: The device to validate
1026 *
1027 * Identical to spi_dv_device() above, except that the DV will be
1028 * scheduled to occur in a workqueue later. All memory allocations
1029 * are atomic, so may be called from any context including those holding
1030 * SCSI locks.
1031 */
1032 void
1033 spi_schedule_dv_device(struct scsi_device *sdev)
1034 {
1035 struct work_queue_wrapper *wqw =
1036 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1037
1038 if (unlikely(!wqw))
1039 return;
1040
1041 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1042 kfree(wqw);
1043 return;
1044 }
1045 /* Set pending early (dv_device doesn't check it, only sets it) */
1046 spi_dv_pending(sdev->sdev_target) = 1;
1047 if (unlikely(scsi_device_get(sdev))) {
1048 kfree(wqw);
1049 spi_dv_pending(sdev->sdev_target) = 0;
1050 return;
1051 }
1052
1053 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1054 wqw->sdev = sdev;
1055
1056 schedule_work(&wqw->work);
1057 }
1058 EXPORT_SYMBOL(spi_schedule_dv_device);
1059
1060 /**
1061 * spi_display_xfer_agreement - Print the current target transfer agreement
1062 * @starget: The target for which to display the agreement
1063 *
1064 * Each SPI port is required to maintain a transfer agreement for each
1065 * other port on the bus. This function prints a one-line summary of
1066 * the current agreement; more detailed information is available in sysfs.
1067 */
1068 void spi_display_xfer_agreement(struct scsi_target *starget)
1069 {
1070 struct spi_transport_attrs *tp;
1071 tp = (struct spi_transport_attrs *)&starget->starget_data;
1072
1073 if (tp->offset > 0 && tp->period > 0) {
1074 unsigned int picosec, kb100;
1075 char *scsi = "FAST-?";
1076 char tmp[8];
1077
1078 if (tp->period <= SPI_STATIC_PPR) {
1079 picosec = ppr_to_ps[tp->period];
1080 switch (tp->period) {
1081 case 7: scsi = "FAST-320"; break;
1082 case 8: scsi = "FAST-160"; break;
1083 case 9: scsi = "FAST-80"; break;
1084 case 10:
1085 case 11: scsi = "FAST-40"; break;
1086 case 12: scsi = "FAST-20"; break;
1087 }
1088 } else {
1089 picosec = tp->period * 4000;
1090 if (tp->period < 25)
1091 scsi = "FAST-20";
1092 else if (tp->period < 50)
1093 scsi = "FAST-10";
1094 else
1095 scsi = "FAST-5";
1096 }
1097
1098 kb100 = (10000000 + picosec / 2) / picosec;
1099 if (tp->width)
1100 kb100 *= 2;
1101 sprint_frac(tmp, picosec, 1000);
1102
1103 dev_info(&starget->dev,
1104 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1105 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1106 tp->dt ? "DT" : "ST",
1107 tp->iu ? " IU" : "",
1108 tp->qas ? " QAS" : "",
1109 tp->rd_strm ? " RDSTRM" : "",
1110 tp->rti ? " RTI" : "",
1111 tp->wr_flow ? " WRFLOW" : "",
1112 tp->pcomp_en ? " PCOMP" : "",
1113 tp->hold_mcs ? " HMCS" : "",
1114 tmp, tp->offset);
1115 } else {
1116 dev_info(&starget->dev, "%sasynchronous\n",
1117 tp->width ? "wide " : "");
1118 }
1119 }
1120 EXPORT_SYMBOL(spi_display_xfer_agreement);
1121
1122 int spi_populate_width_msg(unsigned char *msg, int width)
1123 {
1124 msg[0] = EXTENDED_MESSAGE;
1125 msg[1] = 2;
1126 msg[2] = EXTENDED_WDTR;
1127 msg[3] = width;
1128 return 4;
1129 }
1130 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1131
1132 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1133 {
1134 msg[0] = EXTENDED_MESSAGE;
1135 msg[1] = 3;
1136 msg[2] = EXTENDED_SDTR;
1137 msg[3] = period;
1138 msg[4] = offset;
1139 return 5;
1140 }
1141 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1142
1143 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1144 int width, int options)
1145 {
1146 msg[0] = EXTENDED_MESSAGE;
1147 msg[1] = 6;
1148 msg[2] = EXTENDED_PPR;
1149 msg[3] = period;
1150 msg[4] = 0;
1151 msg[5] = offset;
1152 msg[6] = width;
1153 msg[7] = options;
1154 return 8;
1155 }
1156 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1157
1158 #ifdef CONFIG_SCSI_CONSTANTS
1159 static const char * const one_byte_msgs[] = {
1160 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1161 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1162 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1163 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1164 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1165 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1166 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1167 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1168 };
1169
1170 static const char * const two_byte_msgs[] = {
1171 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1172 /* 0x23 */ "Ignore Wide Residue", "ACA"
1173 };
1174
1175 static const char * const extended_msgs[] = {
1176 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1177 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1178 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1179 };
1180
1181 static void print_nego(const unsigned char *msg, int per, int off, int width)
1182 {
1183 if (per) {
1184 char buf[20];
1185 period_to_str(buf, msg[per]);
1186 printk("period = %s ns ", buf);
1187 }
1188
1189 if (off)
1190 printk("offset = %d ", msg[off]);
1191 if (width)
1192 printk("width = %d ", 8 << msg[width]);
1193 }
1194
1195 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1196 {
1197 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1198 msg[msb+3];
1199 printk("%s = %d ", desc, ptr);
1200 }
1201
1202 int spi_print_msg(const unsigned char *msg)
1203 {
1204 int len = 1, i;
1205 if (msg[0] == EXTENDED_MESSAGE) {
1206 len = 2 + msg[1];
1207 if (len == 2)
1208 len += 256;
1209 if (msg[2] < ARRAY_SIZE(extended_msgs))
1210 printk ("%s ", extended_msgs[msg[2]]);
1211 else
1212 printk ("Extended Message, reserved code (0x%02x) ",
1213 (int) msg[2]);
1214 switch (msg[2]) {
1215 case EXTENDED_MODIFY_DATA_POINTER:
1216 print_ptr(msg, 3, "pointer");
1217 break;
1218 case EXTENDED_SDTR:
1219 print_nego(msg, 3, 4, 0);
1220 break;
1221 case EXTENDED_WDTR:
1222 print_nego(msg, 0, 0, 3);
1223 break;
1224 case EXTENDED_PPR:
1225 print_nego(msg, 3, 5, 6);
1226 break;
1227 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1228 print_ptr(msg, 3, "out");
1229 print_ptr(msg, 7, "in");
1230 break;
1231 default:
1232 for (i = 2; i < len; ++i)
1233 printk("%02x ", msg[i]);
1234 }
1235 /* Identify */
1236 } else if (msg[0] & 0x80) {
1237 printk("Identify disconnect %sallowed %s %d ",
1238 (msg[0] & 0x40) ? "" : "not ",
1239 (msg[0] & 0x20) ? "target routine" : "lun",
1240 msg[0] & 0x7);
1241 /* Normal One byte */
1242 } else if (msg[0] < 0x1f) {
1243 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1244 printk("%s ", one_byte_msgs[msg[0]]);
1245 else
1246 printk("reserved (%02x) ", msg[0]);
1247 } else if (msg[0] == 0x55) {
1248 printk("QAS Request ");
1249 /* Two byte */
1250 } else if (msg[0] <= 0x2f) {
1251 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1252 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1253 msg[1]);
1254 else
1255 printk("reserved two byte (%02x %02x) ",
1256 msg[0], msg[1]);
1257 len = 2;
1258 } else
1259 printk("reserved ");
1260 return len;
1261 }
1262 EXPORT_SYMBOL(spi_print_msg);
1263
1264 #else /* ifndef CONFIG_SCSI_CONSTANTS */
1265
1266 int spi_print_msg(const unsigned char *msg)
1267 {
1268 int len = 1, i;
1269
1270 if (msg[0] == EXTENDED_MESSAGE) {
1271 len = 2 + msg[1];
1272 if (len == 2)
1273 len += 256;
1274 for (i = 0; i < len; ++i)
1275 printk("%02x ", msg[i]);
1276 /* Identify */
1277 } else if (msg[0] & 0x80) {
1278 printk("%02x ", msg[0]);
1279 /* Normal One byte */
1280 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1281 printk("%02x ", msg[0]);
1282 /* Two byte */
1283 } else if (msg[0] <= 0x2f) {
1284 printk("%02x %02x", msg[0], msg[1]);
1285 len = 2;
1286 } else
1287 printk("%02x ", msg[0]);
1288 return len;
1289 }
1290 EXPORT_SYMBOL(spi_print_msg);
1291 #endif /* ! CONFIG_SCSI_CONSTANTS */
1292
1293 static int spi_device_match(struct attribute_container *cont,
1294 struct device *dev)
1295 {
1296 struct scsi_device *sdev;
1297 struct Scsi_Host *shost;
1298 struct spi_internal *i;
1299
1300 if (!scsi_is_sdev_device(dev))
1301 return 0;
1302
1303 sdev = to_scsi_device(dev);
1304 shost = sdev->host;
1305 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1306 != &spi_host_class.class)
1307 return 0;
1308 /* Note: this class has no device attributes, so it has
1309 * no per-HBA allocation and thus we don't need to distinguish
1310 * the attribute containers for the device */
1311 i = to_spi_internal(shost->transportt);
1312 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1313 return 0;
1314 return 1;
1315 }
1316
1317 static int spi_target_match(struct attribute_container *cont,
1318 struct device *dev)
1319 {
1320 struct Scsi_Host *shost;
1321 struct scsi_target *starget;
1322 struct spi_internal *i;
1323
1324 if (!scsi_is_target_device(dev))
1325 return 0;
1326
1327 shost = dev_to_shost(dev->parent);
1328 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1329 != &spi_host_class.class)
1330 return 0;
1331
1332 i = to_spi_internal(shost->transportt);
1333 starget = to_scsi_target(dev);
1334
1335 if (i->f->deny_binding && i->f->deny_binding(starget))
1336 return 0;
1337
1338 return &i->t.target_attrs.ac == cont;
1339 }
1340
1341 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1342 "spi_transport",
1343 spi_setup_transport_attrs,
1344 NULL,
1345 spi_target_configure);
1346
1347 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1348 spi_device_match,
1349 spi_device_configure);
1350
1351 static struct attribute *host_attributes[] = {
1352 &dev_attr_signalling.attr,
1353 NULL
1354 };
1355
1356 static struct attribute_group host_attribute_group = {
1357 .attrs = host_attributes,
1358 };
1359
1360 static int spi_host_configure(struct transport_container *tc,
1361 struct device *dev,
1362 struct device *cdev)
1363 {
1364 struct kobject *kobj = &cdev->kobj;
1365 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1366 struct spi_internal *si = to_spi_internal(shost->transportt);
1367 struct attribute *attr = &dev_attr_signalling.attr;
1368 int rc = 0;
1369
1370 if (si->f->set_signalling)
1371 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1372
1373 return rc;
1374 }
1375
1376 /* returns true if we should be showing the variable. Also
1377 * overloads the return by setting 1<<1 if the attribute should
1378 * be writeable */
1379 #define TARGET_ATTRIBUTE_HELPER(name) \
1380 (si->f->show_##name ? S_IRUGO : 0) | \
1381 (si->f->set_##name ? S_IWUSR : 0)
1382
1383 static mode_t target_attribute_is_visible(struct kobject *kobj,
1384 struct attribute *attr, int i)
1385 {
1386 struct device *cdev = container_of(kobj, struct device, kobj);
1387 struct scsi_target *starget = transport_class_to_starget(cdev);
1388 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1389 struct spi_internal *si = to_spi_internal(shost->transportt);
1390
1391 if (attr == &dev_attr_period.attr &&
1392 spi_support_sync(starget))
1393 return TARGET_ATTRIBUTE_HELPER(period);
1394 else if (attr == &dev_attr_min_period.attr &&
1395 spi_support_sync(starget))
1396 return TARGET_ATTRIBUTE_HELPER(period);
1397 else if (attr == &dev_attr_offset.attr &&
1398 spi_support_sync(starget))
1399 return TARGET_ATTRIBUTE_HELPER(offset);
1400 else if (attr == &dev_attr_max_offset.attr &&
1401 spi_support_sync(starget))
1402 return TARGET_ATTRIBUTE_HELPER(offset);
1403 else if (attr == &dev_attr_width.attr &&
1404 spi_support_wide(starget))
1405 return TARGET_ATTRIBUTE_HELPER(width);
1406 else if (attr == &dev_attr_max_width.attr &&
1407 spi_support_wide(starget))
1408 return TARGET_ATTRIBUTE_HELPER(width);
1409 else if (attr == &dev_attr_iu.attr &&
1410 spi_support_ius(starget))
1411 return TARGET_ATTRIBUTE_HELPER(iu);
1412 else if (attr == &dev_attr_dt.attr &&
1413 spi_support_dt(starget))
1414 return TARGET_ATTRIBUTE_HELPER(dt);
1415 else if (attr == &dev_attr_qas.attr &&
1416 spi_support_qas(starget))
1417 return TARGET_ATTRIBUTE_HELPER(qas);
1418 else if (attr == &dev_attr_wr_flow.attr &&
1419 spi_support_ius(starget))
1420 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1421 else if (attr == &dev_attr_rd_strm.attr &&
1422 spi_support_ius(starget))
1423 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1424 else if (attr == &dev_attr_rti.attr &&
1425 spi_support_ius(starget))
1426 return TARGET_ATTRIBUTE_HELPER(rti);
1427 else if (attr == &dev_attr_pcomp_en.attr &&
1428 spi_support_ius(starget))
1429 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1430 else if (attr == &dev_attr_hold_mcs.attr &&
1431 spi_support_ius(starget))
1432 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1433 else if (attr == &dev_attr_revalidate.attr)
1434 return S_IWUSR;
1435
1436 return 0;
1437 }
1438
1439 static struct attribute *target_attributes[] = {
1440 &dev_attr_period.attr,
1441 &dev_attr_min_period.attr,
1442 &dev_attr_offset.attr,
1443 &dev_attr_max_offset.attr,
1444 &dev_attr_width.attr,
1445 &dev_attr_max_width.attr,
1446 &dev_attr_iu.attr,
1447 &dev_attr_dt.attr,
1448 &dev_attr_qas.attr,
1449 &dev_attr_wr_flow.attr,
1450 &dev_attr_rd_strm.attr,
1451 &dev_attr_rti.attr,
1452 &dev_attr_pcomp_en.attr,
1453 &dev_attr_hold_mcs.attr,
1454 &dev_attr_revalidate.attr,
1455 NULL
1456 };
1457
1458 static struct attribute_group target_attribute_group = {
1459 .attrs = target_attributes,
1460 .is_visible = target_attribute_is_visible,
1461 };
1462
1463 static int spi_target_configure(struct transport_container *tc,
1464 struct device *dev,
1465 struct device *cdev)
1466 {
1467 struct kobject *kobj = &cdev->kobj;
1468
1469 /* force an update based on parameters read from the device */
1470 sysfs_update_group(kobj, &target_attribute_group);
1471
1472 return 0;
1473 }
1474
1475 struct scsi_transport_template *
1476 spi_attach_transport(struct spi_function_template *ft)
1477 {
1478 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1479 GFP_KERNEL);
1480
1481 if (unlikely(!i))
1482 return NULL;
1483
1484 i->t.target_attrs.ac.class = &spi_transport_class.class;
1485 i->t.target_attrs.ac.grp = &target_attribute_group;
1486 i->t.target_attrs.ac.match = spi_target_match;
1487 transport_container_register(&i->t.target_attrs);
1488 i->t.target_size = sizeof(struct spi_transport_attrs);
1489 i->t.host_attrs.ac.class = &spi_host_class.class;
1490 i->t.host_attrs.ac.grp = &host_attribute_group;
1491 i->t.host_attrs.ac.match = spi_host_match;
1492 transport_container_register(&i->t.host_attrs);
1493 i->t.host_size = sizeof(struct spi_host_attrs);
1494 i->f = ft;
1495
1496 return &i->t;
1497 }
1498 EXPORT_SYMBOL(spi_attach_transport);
1499
1500 void spi_release_transport(struct scsi_transport_template *t)
1501 {
1502 struct spi_internal *i = to_spi_internal(t);
1503
1504 transport_container_unregister(&i->t.target_attrs);
1505 transport_container_unregister(&i->t.host_attrs);
1506
1507 kfree(i);
1508 }
1509 EXPORT_SYMBOL(spi_release_transport);
1510
1511 static __init int spi_transport_init(void)
1512 {
1513 int error = transport_class_register(&spi_transport_class);
1514 if (error)
1515 return error;
1516 error = anon_transport_class_register(&spi_device_class);
1517 return transport_class_register(&spi_host_class);
1518 }
1519
1520 static void __exit spi_transport_exit(void)
1521 {
1522 transport_class_unregister(&spi_transport_class);
1523 anon_transport_class_unregister(&spi_device_class);
1524 transport_class_unregister(&spi_host_class);
1525 }
1526
1527 MODULE_AUTHOR("Martin Hicks");
1528 MODULE_DESCRIPTION("SPI Transport Attributes");
1529 MODULE_LICENSE("GPL");
1530
1531 module_init(spi_transport_init);
1532 module_exit(spi_transport_exit);
SocketAccessConTroL development