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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / scsi / scsi_transport_spi.c
blobc25bd9a34e02f4fa2b106694d0e93a8fa28b1e3b
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 /* Our blacklist flags */
50 enum {
51 SPI_BLIST_NOIUS = 0x1,
52 };
53
54 /* blacklist table, modelled on scsi_devinfo.c */
55 static struct {
56 char *vendor;
57 char *model;
58 unsigned flags;
59 } spi_static_device_list[] __initdata = {
60 {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
61 {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
62 {NULL, NULL, 0}
63 };
64
65 /* Private data accessors (keep these out of the header file) */
66 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
67 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
68
69 struct spi_internal {
70 struct scsi_transport_template t;
71 struct spi_function_template *f;
72 };
73
74 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
75
76 static const int ppr_to_ps[] = {
77 /* The PPR values 0-6 are reserved, fill them in when
78 * the committee defines them */
79 -1, /* 0x00 */
80 -1, /* 0x01 */
81 -1, /* 0x02 */
82 -1, /* 0x03 */
83 -1, /* 0x04 */
84 -1, /* 0x05 */
85 -1, /* 0x06 */
86 3125, /* 0x07 */
87 6250, /* 0x08 */
88 12500, /* 0x09 */
89 25000, /* 0x0a */
90 30300, /* 0x0b */
91 50000, /* 0x0c */
92 };
93 /* The PPR values at which you calculate the period in ns by multiplying
94 * by 4 */
95 #define SPI_STATIC_PPR 0x0c
96
97 static int sprint_frac(char *dest, int value, int denom)
98 {
99 int frac = value % denom;
100 int result = sprintf(dest, "%d", value / denom);
101
102 if (frac == 0)
103 return result;
104 dest[result++] = '.';
105
106 do {
107 denom /= 10;
108 sprintf(dest + result, "%d", frac / denom);
109 result++;
110 frac %= denom;
111 } while (frac);
112
113 dest[result++] = '\0';
114 return result;
115 }
116
117 static int spi_execute(struct scsi_device *sdev, const void *cmd,
118 enum dma_data_direction dir,
119 void *buffer, unsigned bufflen,
120 struct scsi_sense_hdr *sshdr)
121 {
122 int i, result;
123 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
124
125 for(i = 0; i < DV_RETRIES; i++) {
126 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
127 sense, DV_TIMEOUT, /* retries */ 1,
128 REQ_FAILFAST_DEV |
129 REQ_FAILFAST_TRANSPORT |
130 REQ_FAILFAST_DRIVER,
131 NULL);
132 if (driver_byte(result) & DRIVER_SENSE) {
133 struct scsi_sense_hdr sshdr_tmp;
134 if (!sshdr)
135 sshdr = &sshdr_tmp;
136
137 if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
138 sshdr)
139 && sshdr->sense_key == UNIT_ATTENTION)
140 continue;
141 }
142 break;
143 }
144 return result;
145 }
146
147 static struct {
148 enum spi_signal_type value;
149 char *name;
150 } signal_types[] = {
151 { SPI_SIGNAL_UNKNOWN, "unknown" },
152 { SPI_SIGNAL_SE, "SE" },
153 { SPI_SIGNAL_LVD, "LVD" },
154 { SPI_SIGNAL_HVD, "HVD" },
155 };
156
157 static inline const char *spi_signal_to_string(enum spi_signal_type type)
158 {
159 int i;
160
161 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
162 if (type == signal_types[i].value)
163 return signal_types[i].name;
164 }
165 return NULL;
166 }
167 static inline enum spi_signal_type spi_signal_to_value(const char *name)
168 {
169 int i, len;
170
171 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
172 len = strlen(signal_types[i].name);
173 if (strncmp(name, signal_types[i].name, len) == 0 &&
174 (name[len] == '\n' || name[len] == '\0'))
175 return signal_types[i].value;
176 }
177 return SPI_SIGNAL_UNKNOWN;
178 }
179
180 static int spi_host_setup(struct transport_container *tc, struct device *dev,
181 struct device *cdev)
182 {
183 struct Scsi_Host *shost = dev_to_shost(dev);
184
185 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
186
187 return 0;
188 }
189
190 static int spi_host_configure(struct transport_container *tc,
191 struct device *dev,
192 struct device *cdev);
193
194 static DECLARE_TRANSPORT_CLASS(spi_host_class,
195 "spi_host",
196 spi_host_setup,
197 NULL,
198 spi_host_configure);
199
200 static int spi_host_match(struct attribute_container *cont,
201 struct device *dev)
202 {
203 struct Scsi_Host *shost;
204
205 if (!scsi_is_host_device(dev))
206 return 0;
207
208 shost = dev_to_shost(dev);
209 if (!shost->transportt || shost->transportt->host_attrs.ac.class
210 != &spi_host_class.class)
211 return 0;
212
213 return &shost->transportt->host_attrs.ac == cont;
214 }
215
216 static int spi_target_configure(struct transport_container *tc,
217 struct device *dev,
218 struct device *cdev);
219
220 static int spi_device_configure(struct transport_container *tc,
221 struct device *dev,
222 struct device *cdev)
223 {
224 struct scsi_device *sdev = to_scsi_device(dev);
225 struct scsi_target *starget = sdev->sdev_target;
226 unsigned bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
227 &sdev->inquiry[16],
228 SCSI_DEVINFO_SPI);
229
230 /* Populate the target capability fields with the values
231 * gleaned from the device inquiry */
232
233 spi_support_sync(starget) = scsi_device_sync(sdev);
234 spi_support_wide(starget) = scsi_device_wide(sdev);
235 spi_support_dt(starget) = scsi_device_dt(sdev);
236 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
237 spi_support_ius(starget) = scsi_device_ius(sdev);
238 if (bflags & SPI_BLIST_NOIUS) {
239 dev_info(dev, "Information Units disabled by blacklist\n");
240 spi_support_ius(starget) = 0;
241 }
242 spi_support_qas(starget) = scsi_device_qas(sdev);
243
244 return 0;
245 }
246
247 static int spi_setup_transport_attrs(struct transport_container *tc,
248 struct device *dev,
249 struct device *cdev)
250 {
251 struct scsi_target *starget = to_scsi_target(dev);
252
253 spi_period(starget) = -1; /* illegal value */
254 spi_min_period(starget) = 0;
255 spi_offset(starget) = 0; /* async */
256 spi_max_offset(starget) = 255;
257 spi_width(starget) = 0; /* narrow */
258 spi_max_width(starget) = 1;
259 spi_iu(starget) = 0; /* no IU */
260 spi_max_iu(starget) = 1;
261 spi_dt(starget) = 0; /* ST */
262 spi_qas(starget) = 0;
263 spi_max_qas(starget) = 1;
264 spi_wr_flow(starget) = 0;
265 spi_rd_strm(starget) = 0;
266 spi_rti(starget) = 0;
267 spi_pcomp_en(starget) = 0;
268 spi_hold_mcs(starget) = 0;
269 spi_dv_pending(starget) = 0;
270 spi_dv_in_progress(starget) = 0;
271 spi_initial_dv(starget) = 0;
272 mutex_init(&spi_dv_mutex(starget));
273
274 return 0;
275 }
276
277 #define spi_transport_show_simple(field, format_string) \
278 \
279 static ssize_t \
280 show_spi_transport_##field(struct device *dev, \
281 struct device_attribute *attr, char *buf) \
282 { \
283 struct scsi_target *starget = transport_class_to_starget(dev); \
284 struct spi_transport_attrs *tp; \
285 \
286 tp = (struct spi_transport_attrs *)&starget->starget_data; \
287 return snprintf(buf, 20, format_string, tp->field); \
288 }
289
290 #define spi_transport_store_simple(field, format_string) \
291 \
292 static ssize_t \
293 store_spi_transport_##field(struct device *dev, \
294 struct device_attribute *attr, \
295 const char *buf, size_t count) \
296 { \
297 int val; \
298 struct scsi_target *starget = transport_class_to_starget(dev); \
299 struct spi_transport_attrs *tp; \
300 \
301 tp = (struct spi_transport_attrs *)&starget->starget_data; \
302 val = simple_strtoul(buf, NULL, 0); \
303 tp->field = val; \
304 return count; \
305 }
306
307 #define spi_transport_show_function(field, format_string) \
308 \
309 static ssize_t \
310 show_spi_transport_##field(struct device *dev, \
311 struct device_attribute *attr, char *buf) \
312 { \
313 struct scsi_target *starget = transport_class_to_starget(dev); \
314 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
315 struct spi_transport_attrs *tp; \
316 struct spi_internal *i = to_spi_internal(shost->transportt); \
317 tp = (struct spi_transport_attrs *)&starget->starget_data; \
318 if (i->f->get_##field) \
319 i->f->get_##field(starget); \
320 return snprintf(buf, 20, format_string, tp->field); \
321 }
322
323 #define spi_transport_store_function(field, format_string) \
324 static ssize_t \
325 store_spi_transport_##field(struct device *dev, \
326 struct device_attribute *attr, \
327 const char *buf, size_t count) \
328 { \
329 int val; \
330 struct scsi_target *starget = transport_class_to_starget(dev); \
331 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
332 struct spi_internal *i = to_spi_internal(shost->transportt); \
333 \
334 if (!i->f->set_##field) \
335 return -EINVAL; \
336 val = simple_strtoul(buf, NULL, 0); \
337 i->f->set_##field(starget, val); \
338 return count; \
339 }
340
341 #define spi_transport_store_max(field, format_string) \
342 static ssize_t \
343 store_spi_transport_##field(struct device *dev, \
344 struct device_attribute *attr, \
345 const char *buf, size_t count) \
346 { \
347 int val; \
348 struct scsi_target *starget = transport_class_to_starget(dev); \
349 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
350 struct spi_internal *i = to_spi_internal(shost->transportt); \
351 struct spi_transport_attrs *tp \
352 = (struct spi_transport_attrs *)&starget->starget_data; \
353 \
354 if (i->f->set_##field) \
355 return -EINVAL; \
356 val = simple_strtoul(buf, NULL, 0); \
357 if (val > tp->max_##field) \
358 val = tp->max_##field; \
359 i->f->set_##field(starget, val); \
360 return count; \
361 }
362
363 #define spi_transport_rd_attr(field, format_string) \
364 spi_transport_show_function(field, format_string) \
365 spi_transport_store_function(field, format_string) \
366 static DEVICE_ATTR(field, S_IRUGO, \
367 show_spi_transport_##field, \
368 store_spi_transport_##field);
369
370 #define spi_transport_simple_attr(field, format_string) \
371 spi_transport_show_simple(field, format_string) \
372 spi_transport_store_simple(field, format_string) \
373 static DEVICE_ATTR(field, S_IRUGO, \
374 show_spi_transport_##field, \
375 store_spi_transport_##field);
376
377 #define spi_transport_max_attr(field, format_string) \
378 spi_transport_show_function(field, format_string) \
379 spi_transport_store_max(field, format_string) \
380 spi_transport_simple_attr(max_##field, format_string) \
381 static DEVICE_ATTR(field, S_IRUGO, \
382 show_spi_transport_##field, \
383 store_spi_transport_##field);
384
385 /* The Parallel SCSI Tranport Attributes: */
386 spi_transport_max_attr(offset, "%d\n");
387 spi_transport_max_attr(width, "%d\n");
388 spi_transport_max_attr(iu, "%d\n");
389 spi_transport_rd_attr(dt, "%d\n");
390 spi_transport_max_attr(qas, "%d\n");
391 spi_transport_rd_attr(wr_flow, "%d\n");
392 spi_transport_rd_attr(rd_strm, "%d\n");
393 spi_transport_rd_attr(rti, "%d\n");
394 spi_transport_rd_attr(pcomp_en, "%d\n");
395 spi_transport_rd_attr(hold_mcs, "%d\n");
396
397 /* we only care about the first child device that's a real SCSI device
398 * so we return 1 to terminate the iteration when we find it */
399 static int child_iter(struct device *dev, void *data)
400 {
401 if (!scsi_is_sdev_device(dev))
402 return 0;
403
404 spi_dv_device(to_scsi_device(dev));
405 return 1;
406 }
407
408 static ssize_t
409 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
410 const char *buf, size_t count)
411 {
412 struct scsi_target *starget = transport_class_to_starget(dev);
413
414 device_for_each_child(&starget->dev, NULL, child_iter);
415 return count;
416 }
417 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
418
419 /* Translate the period into ns according to the current spec
420 * for SDTR/PPR messages */
421 static int period_to_str(char *buf, int period)
422 {
423 int len, picosec;
424
425 if (period < 0 || period > 0xff) {
426 picosec = -1;
427 } else if (period <= SPI_STATIC_PPR) {
428 picosec = ppr_to_ps[period];
429 } else {
430 picosec = period * 4000;
431 }
432
433 if (picosec == -1) {
434 len = sprintf(buf, "reserved");
435 } else {
436 len = sprint_frac(buf, picosec, 1000);
437 }
438
439 return len;
440 }
441
442 static ssize_t
443 show_spi_transport_period_helper(char *buf, int period)
444 {
445 int len = period_to_str(buf, period);
446 buf[len++] = '\n';
447 buf[len] = '\0';
448 return len;
449 }
450
451 static ssize_t
452 store_spi_transport_period_helper(struct device *dev, const char *buf,
453 size_t count, int *periodp)
454 {
455 int j, picosec, period = -1;
456 char *endp;
457
458 picosec = simple_strtoul(buf, &endp, 10) * 1000;
459 if (*endp == '.') {
460 int mult = 100;
461 do {
462 endp++;
463 if (!isdigit(*endp))
464 break;
465 picosec += (*endp - '0') * mult;
466 mult /= 10;
467 } while (mult > 0);
468 }
469
470 for (j = 0; j <= SPI_STATIC_PPR; j++) {
471 if (ppr_to_ps[j] < picosec)
472 continue;
473 period = j;
474 break;
475 }
476
477 if (period == -1)
478 period = picosec / 4000;
479
480 if (period > 0xff)
481 period = 0xff;
482
483 *periodp = period;
484
485 return count;
486 }
487
488 static ssize_t
489 show_spi_transport_period(struct device *dev,
490 struct device_attribute *attr, char *buf)
491 {
492 struct scsi_target *starget = transport_class_to_starget(dev);
493 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
494 struct spi_internal *i = to_spi_internal(shost->transportt);
495 struct spi_transport_attrs *tp =
496 (struct spi_transport_attrs *)&starget->starget_data;
497
498 if (i->f->get_period)
499 i->f->get_period(starget);
500
501 return show_spi_transport_period_helper(buf, tp->period);
502 }
503
504 static ssize_t
505 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
506 const char *buf, size_t count)
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 int period, retval;
514
515 if (!i->f->set_period)
516 return -EINVAL;
517
518 retval = store_spi_transport_period_helper(cdev, buf, count, &period);
519
520 if (period < tp->min_period)
521 period = tp->min_period;
522
523 i->f->set_period(starget, period);
524
525 return retval;
526 }
527
528 static DEVICE_ATTR(period, S_IRUGO,
529 show_spi_transport_period,
530 store_spi_transport_period);
531
532 static ssize_t
533 show_spi_transport_min_period(struct device *cdev,
534 struct device_attribute *attr, char *buf)
535 {
536 struct scsi_target *starget = transport_class_to_starget(cdev);
537 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
538 struct spi_internal *i = to_spi_internal(shost->transportt);
539 struct spi_transport_attrs *tp =
540 (struct spi_transport_attrs *)&starget->starget_data;
541
542 if (!i->f->set_period)
543 return -EINVAL;
544
545 return show_spi_transport_period_helper(buf, tp->min_period);
546 }
547
548 static ssize_t
549 store_spi_transport_min_period(struct device *cdev,
550 struct device_attribute *attr,
551 const char *buf, size_t count)
552 {
553 struct scsi_target *starget = transport_class_to_starget(cdev);
554 struct spi_transport_attrs *tp =
555 (struct spi_transport_attrs *)&starget->starget_data;
556
557 return store_spi_transport_period_helper(cdev, buf, count,
558 &tp->min_period);
559 }
560
561
562 static DEVICE_ATTR(min_period, S_IRUGO,
563 show_spi_transport_min_period,
564 store_spi_transport_min_period);
565
566
567 static ssize_t show_spi_host_signalling(struct device *cdev,
568 struct device_attribute *attr,
569 char *buf)
570 {
571 struct Scsi_Host *shost = transport_class_to_shost(cdev);
572 struct spi_internal *i = to_spi_internal(shost->transportt);
573
574 if (i->f->get_signalling)
575 i->f->get_signalling(shost);
576
577 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
578 }
579 static ssize_t store_spi_host_signalling(struct device *dev,
580 struct device_attribute *attr,
581 const char *buf, size_t count)
582 {
583 struct Scsi_Host *shost = transport_class_to_shost(dev);
584 struct spi_internal *i = to_spi_internal(shost->transportt);
585 enum spi_signal_type type = spi_signal_to_value(buf);
586
587 if (!i->f->set_signalling)
588 return -EINVAL;
589
590 if (type != SPI_SIGNAL_UNKNOWN)
591 i->f->set_signalling(shost, type);
592
593 return count;
594 }
595 static DEVICE_ATTR(signalling, S_IRUGO,
596 show_spi_host_signalling,
597 store_spi_host_signalling);
598
599 #define DV_SET(x, y) \
600 if(i->f->set_##x) \
601 i->f->set_##x(sdev->sdev_target, y)
602
603 enum spi_compare_returns {
604 SPI_COMPARE_SUCCESS,
605 SPI_COMPARE_FAILURE,
606 SPI_COMPARE_SKIP_TEST,
607 };
608
609
610 /* This is for read/write Domain Validation: If the device supports
611 * an echo buffer, we do read/write tests to it */
612 static enum spi_compare_returns
613 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
614 u8 *ptr, const int retries)
615 {
616 int len = ptr - buffer;
617 int j, k, r, result;
618 unsigned int pattern = 0x0000ffff;
619 struct scsi_sense_hdr sshdr;
620
621 const char spi_write_buffer[] = {
622 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
623 };
624 const char spi_read_buffer[] = {
625 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
626 };
627
628 /* set up the pattern buffer. Doesn't matter if we spill
629 * slightly beyond since that's where the read buffer is */
630 for (j = 0; j < len; ) {
631
632 /* fill the buffer with counting (test a) */
633 for ( ; j < min(len, 32); j++)
634 buffer[j] = j;
635 k = j;
636 /* fill the buffer with alternating words of 0x0 and
637 * 0xffff (test b) */
638 for ( ; j < min(len, k + 32); j += 2) {
639 u16 *word = (u16 *)&buffer[j];
640
641 *word = (j & 0x02) ? 0x0000 : 0xffff;
642 }
643 k = j;
644 /* fill with crosstalk (alternating 0x5555 0xaaa)
645 * (test c) */
646 for ( ; j < min(len, k + 32); j += 2) {
647 u16 *word = (u16 *)&buffer[j];
648
649 *word = (j & 0x02) ? 0x5555 : 0xaaaa;
650 }
651 k = j;
652 /* fill with shifting bits (test d) */
653 for ( ; j < min(len, k + 32); j += 4) {
654 u32 *word = (unsigned int *)&buffer[j];
655 u32 roll = (pattern & 0x80000000) ? 1 : 0;
656
657 *word = pattern;
658 pattern = (pattern << 1) | roll;
659 }
660 /* don't bother with random data (test e) */
661 }
662
663 for (r = 0; r < retries; r++) {
664 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
665 buffer, len, &sshdr);
666 if(result || !scsi_device_online(sdev)) {
667
668 scsi_device_set_state(sdev, SDEV_QUIESCE);
669 if (scsi_sense_valid(&sshdr)
670 && sshdr.sense_key == ILLEGAL_REQUEST
671 /* INVALID FIELD IN CDB */
672 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
673 /* This would mean that the drive lied
674 * to us about supporting an echo
675 * buffer (unfortunately some Western
676 * Digital drives do precisely this)
677 */
678 return SPI_COMPARE_SKIP_TEST;
679
680
681 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
682 return SPI_COMPARE_FAILURE;
683 }
684
685 memset(ptr, 0, len);
686 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
687 ptr, len, NULL);
688 scsi_device_set_state(sdev, SDEV_QUIESCE);
689
690 if (memcmp(buffer, ptr, len) != 0)
691 return SPI_COMPARE_FAILURE;
692 }
693 return SPI_COMPARE_SUCCESS;
694 }
695
696 /* This is for the simplest form of Domain Validation: a read test
697 * on the inquiry data from the device */
698 static enum spi_compare_returns
699 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
700 u8 *ptr, const int retries)
701 {
702 int r, result;
703 const int len = sdev->inquiry_len;
704 const char spi_inquiry[] = {
705 INQUIRY, 0, 0, 0, len, 0
706 };
707
708 for (r = 0; r < retries; r++) {
709 memset(ptr, 0, len);
710
711 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
712 ptr, len, NULL);
713
714 if(result || !scsi_device_online(sdev)) {
715 scsi_device_set_state(sdev, SDEV_QUIESCE);
716 return SPI_COMPARE_FAILURE;
717 }
718
719 /* If we don't have the inquiry data already, the
720 * first read gets it */
721 if (ptr == buffer) {
722 ptr += len;
723 --r;
724 continue;
725 }
726
727 if (memcmp(buffer, ptr, len) != 0)
728 /* failure */
729 return SPI_COMPARE_FAILURE;
730 }
731 return SPI_COMPARE_SUCCESS;
732 }
733
734 static enum spi_compare_returns
735 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
736 enum spi_compare_returns
737 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
738 {
739 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
740 struct scsi_target *starget = sdev->sdev_target;
741 int period = 0, prevperiod = 0;
742 enum spi_compare_returns retval;
743
744
745 for (;;) {
746 int newperiod;
747 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
748
749 if (retval == SPI_COMPARE_SUCCESS
750 || retval == SPI_COMPARE_SKIP_TEST)
751 break;
752
753 /* OK, retrain, fallback */
754 if (i->f->get_iu)
755 i->f->get_iu(starget);
756 if (i->f->get_qas)
757 i->f->get_qas(starget);
758 if (i->f->get_period)
759 i->f->get_period(sdev->sdev_target);
760
761 /* Here's the fallback sequence; first try turning off
762 * IU, then QAS (if we can control them), then finally
763 * fall down the periods */
764 if (i->f->set_iu && spi_iu(starget)) {
765 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
766 DV_SET(iu, 0);
767 } else if (i->f->set_qas && spi_qas(starget)) {
768 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
769 DV_SET(qas, 0);
770 } else {
771 newperiod = spi_period(starget);
772 period = newperiod > period ? newperiod : period;
773 if (period < 0x0d)
774 period++;
775 else
776 period += period >> 1;
777
778 if (unlikely(period > 0xff || period == prevperiod)) {
779 /* Total failure; set to async and return */
780 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
781 DV_SET(offset, 0);
782 return SPI_COMPARE_FAILURE;
783 }
784 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
785 DV_SET(period, period);
786 prevperiod = period;
787 }
788 }
789 return retval;
790 }
791
792 static int
793 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
794 {
795 int l, result;
796
797 /* first off do a test unit ready. This can error out
798 * because of reservations or some other reason. If it
799 * fails, the device won't let us write to the echo buffer
800 * so just return failure */
801
802 const char spi_test_unit_ready[] = {
803 TEST_UNIT_READY, 0, 0, 0, 0, 0
804 };
805
806 const char spi_read_buffer_descriptor[] = {
807 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
808 };
809
810
811 /* We send a set of three TURs to clear any outstanding
812 * unit attention conditions if they exist (Otherwise the
813 * buffer tests won't be happy). If the TUR still fails
814 * (reservation conflict, device not ready, etc) just
815 * skip the write tests */
816 for (l = 0; ; l++) {
817 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
818 NULL, 0, NULL);
819
820 if(result) {
821 if(l >= 3)
822 return 0;
823 } else {
824 /* TUR succeeded */
825 break;
826 }
827 }
828
829 result = spi_execute(sdev, spi_read_buffer_descriptor,
830 DMA_FROM_DEVICE, buffer, 4, NULL);
831
832 if (result)
833 /* Device has no echo buffer */
834 return 0;
835
836 return buffer[3] + ((buffer[2] & 0x1f) << 8);
837 }
838
839 static void
840 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
841 {
842 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
843 struct scsi_target *starget = sdev->sdev_target;
844 struct Scsi_Host *shost = sdev->host;
845 int len = sdev->inquiry_len;
846 int min_period = spi_min_period(starget);
847 int max_width = spi_max_width(starget);
848 /* first set us up for narrow async */
849 DV_SET(offset, 0);
850 DV_SET(width, 0);
851
852 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
853 != SPI_COMPARE_SUCCESS) {
854 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
855 /* FIXME: should probably offline the device here? */
856 return;
857 }
858
859 if (!spi_support_wide(starget)) {
860 spi_max_width(starget) = 0;
861 max_width = 0;
862 }
863
864 /* test width */
865 if (i->f->set_width && max_width) {
866 i->f->set_width(starget, 1);
867
868 if (spi_dv_device_compare_inquiry(sdev, buffer,
869 buffer + len,
870 DV_LOOPS)
871 != SPI_COMPARE_SUCCESS) {
872 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
873 i->f->set_width(starget, 0);
874 /* Make sure we don't force wide back on by asking
875 * for a transfer period that requires it */
876 max_width = 0;
877 if (min_period < 10)
878 min_period = 10;
879 }
880 }
881
882 if (!i->f->set_period)
883 return;
884
885 /* device can't handle synchronous */
886 if (!spi_support_sync(starget) && !spi_support_dt(starget))
887 return;
888
889 /* len == -1 is the signal that we need to ascertain the
890 * presence of an echo buffer before trying to use it. len ==
891 * 0 means we don't have an echo buffer */
892 len = -1;
893
894 retry:
895
896 /* now set up to the maximum */
897 DV_SET(offset, spi_max_offset(starget));
898 DV_SET(period, min_period);
899
900 /* try QAS requests; this should be harmless to set if the
901 * target supports it */
902 if (spi_support_qas(starget) && spi_max_qas(starget)) {
903 DV_SET(qas, 1);
904 } else {
905 DV_SET(qas, 0);
906 }
907
908 if (spi_support_ius(starget) && spi_max_iu(starget) &&
909 min_period < 9) {
910 /* This u320 (or u640). Set IU transfers */
911 DV_SET(iu, 1);
912 /* Then set the optional parameters */
913 DV_SET(rd_strm, 1);
914 DV_SET(wr_flow, 1);
915 DV_SET(rti, 1);
916 if (min_period == 8)
917 DV_SET(pcomp_en, 1);
918 } else {
919 DV_SET(iu, 0);
920 }
921
922 /* now that we've done all this, actually check the bus
923 * signal type (if known). Some devices are stupid on
924 * a SE bus and still claim they can try LVD only settings */
925 if (i->f->get_signalling)
926 i->f->get_signalling(shost);
927 if (spi_signalling(shost) == SPI_SIGNAL_SE ||
928 spi_signalling(shost) == SPI_SIGNAL_HVD ||
929 !spi_support_dt(starget)) {
930 DV_SET(dt, 0);
931 } else {
932 DV_SET(dt, 1);
933 }
934 /* set width last because it will pull all the other
935 * parameters down to required values */
936 DV_SET(width, max_width);
937
938 /* Do the read only INQUIRY tests */
939 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
940 spi_dv_device_compare_inquiry);
941 /* See if we actually managed to negotiate and sustain DT */
942 if (i->f->get_dt)
943 i->f->get_dt(starget);
944
945 /* see if the device has an echo buffer. If it does we can do
946 * the SPI pattern write tests. Because of some broken
947 * devices, we *only* try this on a device that has actually
948 * negotiated DT */
949
950 if (len == -1 && spi_dt(starget))
951 len = spi_dv_device_get_echo_buffer(sdev, buffer);
952
953 if (len <= 0) {
954 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
955 return;
956 }
957
958 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
959 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
960 len = SPI_MAX_ECHO_BUFFER_SIZE;
961 }
962
963 if (spi_dv_retrain(sdev, buffer, buffer + len,
964 spi_dv_device_echo_buffer)
965 == SPI_COMPARE_SKIP_TEST) {
966 /* OK, the stupid drive can't do a write echo buffer
967 * test after all, fall back to the read tests */
968 len = 0;
969 goto retry;
970 }
971 }
972
973
974 /** spi_dv_device - Do Domain Validation on the device
975 * @sdev: scsi device to validate
976 *
977 * Performs the domain validation on the given device in the
978 * current execution thread. Since DV operations may sleep,
979 * the current thread must have user context. Also no SCSI
980 * related locks that would deadlock I/O issued by the DV may
981 * be held.
982 */
983 void
984 spi_dv_device(struct scsi_device *sdev)
985 {
986 struct scsi_target *starget = sdev->sdev_target;
987 u8 *buffer;
988 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
989
990 if (unlikely(scsi_device_get(sdev)))
991 return;
992
993 if (unlikely(spi_dv_in_progress(starget)))
994 return;
995 spi_dv_in_progress(starget) = 1;
996
997 buffer = kzalloc(len, GFP_KERNEL);
998
999 if (unlikely(!buffer))
1000 goto out_put;
1001
1002 /* We need to verify that the actual device will quiesce; the
1003 * later target quiesce is just a nice to have */
1004 if (unlikely(scsi_device_quiesce(sdev)))
1005 goto out_free;
1006
1007 scsi_target_quiesce(starget);
1008
1009 spi_dv_pending(starget) = 1;
1010 mutex_lock(&spi_dv_mutex(starget));
1011
1012 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
1013
1014 spi_dv_device_internal(sdev, buffer);
1015
1016 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
1017
1018 mutex_unlock(&spi_dv_mutex(starget));
1019 spi_dv_pending(starget) = 0;
1020
1021 scsi_target_resume(starget);
1022
1023 spi_initial_dv(starget) = 1;
1024
1025 out_free:
1026 kfree(buffer);
1027 out_put:
1028 spi_dv_in_progress(starget) = 0;
1029 scsi_device_put(sdev);
1030 }
1031 EXPORT_SYMBOL(spi_dv_device);
1032
1033 struct work_queue_wrapper {
1034 struct work_struct work;
1035 struct scsi_device *sdev;
1036 };
1037
1038 static void
1039 spi_dv_device_work_wrapper(struct work_struct *work)
1040 {
1041 struct work_queue_wrapper *wqw =
1042 container_of(work, struct work_queue_wrapper, work);
1043 struct scsi_device *sdev = wqw->sdev;
1044
1045 kfree(wqw);
1046 spi_dv_device(sdev);
1047 spi_dv_pending(sdev->sdev_target) = 0;
1048 scsi_device_put(sdev);
1049 }
1050
1051
1052 /**
1053 * spi_schedule_dv_device - schedule domain validation to occur on the device
1054 * @sdev: The device to validate
1055 *
1056 * Identical to spi_dv_device() above, except that the DV will be
1057 * scheduled to occur in a workqueue later. All memory allocations
1058 * are atomic, so may be called from any context including those holding
1059 * SCSI locks.
1060 */
1061 void
1062 spi_schedule_dv_device(struct scsi_device *sdev)
1063 {
1064 struct work_queue_wrapper *wqw =
1065 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1066
1067 if (unlikely(!wqw))
1068 return;
1069
1070 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1071 kfree(wqw);
1072 return;
1073 }
1074 /* Set pending early (dv_device doesn't check it, only sets it) */
1075 spi_dv_pending(sdev->sdev_target) = 1;
1076 if (unlikely(scsi_device_get(sdev))) {
1077 kfree(wqw);
1078 spi_dv_pending(sdev->sdev_target) = 0;
1079 return;
1080 }
1081
1082 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1083 wqw->sdev = sdev;
1084
1085 schedule_work(&wqw->work);
1086 }
1087 EXPORT_SYMBOL(spi_schedule_dv_device);
1088
1089 /**
1090 * spi_display_xfer_agreement - Print the current target transfer agreement
1091 * @starget: The target for which to display the agreement
1092 *
1093 * Each SPI port is required to maintain a transfer agreement for each
1094 * other port on the bus. This function prints a one-line summary of
1095 * the current agreement; more detailed information is available in sysfs.
1096 */
1097 void spi_display_xfer_agreement(struct scsi_target *starget)
1098 {
1099 struct spi_transport_attrs *tp;
1100 tp = (struct spi_transport_attrs *)&starget->starget_data;
1101
1102 if (tp->offset > 0 && tp->period > 0) {
1103 unsigned int picosec, kb100;
1104 char *scsi = "FAST-?";
1105 char tmp[8];
1106
1107 if (tp->period <= SPI_STATIC_PPR) {
1108 picosec = ppr_to_ps[tp->period];
1109 switch (tp->period) {
1110 case 7: scsi = "FAST-320"; break;
1111 case 8: scsi = "FAST-160"; break;
1112 case 9: scsi = "FAST-80"; break;
1113 case 10:
1114 case 11: scsi = "FAST-40"; break;
1115 case 12: scsi = "FAST-20"; break;
1116 }
1117 } else {
1118 picosec = tp->period * 4000;
1119 if (tp->period < 25)
1120 scsi = "FAST-20";
1121 else if (tp->period < 50)
1122 scsi = "FAST-10";
1123 else
1124 scsi = "FAST-5";
1125 }
1126
1127 kb100 = (10000000 + picosec / 2) / picosec;
1128 if (tp->width)
1129 kb100 *= 2;
1130 sprint_frac(tmp, picosec, 1000);
1131
1132 dev_info(&starget->dev,
1133 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1134 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1135 tp->dt ? "DT" : "ST",
1136 tp->iu ? " IU" : "",
1137 tp->qas ? " QAS" : "",
1138 tp->rd_strm ? " RDSTRM" : "",
1139 tp->rti ? " RTI" : "",
1140 tp->wr_flow ? " WRFLOW" : "",
1141 tp->pcomp_en ? " PCOMP" : "",
1142 tp->hold_mcs ? " HMCS" : "",
1143 tmp, tp->offset);
1144 } else {
1145 dev_info(&starget->dev, "%sasynchronous\n",
1146 tp->width ? "wide " : "");
1147 }
1148 }
1149 EXPORT_SYMBOL(spi_display_xfer_agreement);
1150
1151 int spi_populate_width_msg(unsigned char *msg, int width)
1152 {
1153 msg[0] = EXTENDED_MESSAGE;
1154 msg[1] = 2;
1155 msg[2] = EXTENDED_WDTR;
1156 msg[3] = width;
1157 return 4;
1158 }
1159 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1160
1161 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1162 {
1163 msg[0] = EXTENDED_MESSAGE;
1164 msg[1] = 3;
1165 msg[2] = EXTENDED_SDTR;
1166 msg[3] = period;
1167 msg[4] = offset;
1168 return 5;
1169 }
1170 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1171
1172 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1173 int width, int options)
1174 {
1175 msg[0] = EXTENDED_MESSAGE;
1176 msg[1] = 6;
1177 msg[2] = EXTENDED_PPR;
1178 msg[3] = period;
1179 msg[4] = 0;
1180 msg[5] = offset;
1181 msg[6] = width;
1182 msg[7] = options;
1183 return 8;
1184 }
1185 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1186
1187 #ifdef CONFIG_SCSI_CONSTANTS
1188 static const char * const one_byte_msgs[] = {
1189 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1190 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1191 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1192 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1193 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1194 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1195 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1196 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1197 };
1198
1199 static const char * const two_byte_msgs[] = {
1200 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1201 /* 0x23 */ "Ignore Wide Residue", "ACA"
1202 };
1203
1204 static const char * const extended_msgs[] = {
1205 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1206 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1207 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1208 };
1209
1210 static void print_nego(const unsigned char *msg, int per, int off, int width)
1211 {
1212 if (per) {
1213 char buf[20];
1214 period_to_str(buf, msg[per]);
1215 printk("period = %s ns ", buf);
1216 }
1217
1218 if (off)
1219 printk("offset = %d ", msg[off]);
1220 if (width)
1221 printk("width = %d ", 8 << msg[width]);
1222 }
1223
1224 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1225 {
1226 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1227 msg[msb+3];
1228 printk("%s = %d ", desc, ptr);
1229 }
1230
1231 int spi_print_msg(const unsigned char *msg)
1232 {
1233 int len = 1, i;
1234 if (msg[0] == EXTENDED_MESSAGE) {
1235 len = 2 + msg[1];
1236 if (len == 2)
1237 len += 256;
1238 if (msg[2] < ARRAY_SIZE(extended_msgs))
1239 printk ("%s ", extended_msgs[msg[2]]);
1240 else
1241 printk ("Extended Message, reserved code (0x%02x) ",
1242 (int) msg[2]);
1243 switch (msg[2]) {
1244 case EXTENDED_MODIFY_DATA_POINTER:
1245 print_ptr(msg, 3, "pointer");
1246 break;
1247 case EXTENDED_SDTR:
1248 print_nego(msg, 3, 4, 0);
1249 break;
1250 case EXTENDED_WDTR:
1251 print_nego(msg, 0, 0, 3);
1252 break;
1253 case EXTENDED_PPR:
1254 print_nego(msg, 3, 5, 6);
1255 break;
1256 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1257 print_ptr(msg, 3, "out");
1258 print_ptr(msg, 7, "in");
1259 break;
1260 default:
1261 for (i = 2; i < len; ++i)
1262 printk("%02x ", msg[i]);
1263 }
1264 /* Identify */
1265 } else if (msg[0] & 0x80) {
1266 printk("Identify disconnect %sallowed %s %d ",
1267 (msg[0] & 0x40) ? "" : "not ",
1268 (msg[0] & 0x20) ? "target routine" : "lun",
1269 msg[0] & 0x7);
1270 /* Normal One byte */
1271 } else if (msg[0] < 0x1f) {
1272 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1273 printk("%s ", one_byte_msgs[msg[0]]);
1274 else
1275 printk("reserved (%02x) ", msg[0]);
1276 } else if (msg[0] == 0x55) {
1277 printk("QAS Request ");
1278 /* Two byte */
1279 } else if (msg[0] <= 0x2f) {
1280 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1281 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1282 msg[1]);
1283 else
1284 printk("reserved two byte (%02x %02x) ",
1285 msg[0], msg[1]);
1286 len = 2;
1287 } else
1288 printk("reserved ");
1289 return len;
1290 }
1291 EXPORT_SYMBOL(spi_print_msg);
1292
1293 #else /* ifndef CONFIG_SCSI_CONSTANTS */
1294
1295 int spi_print_msg(const unsigned char *msg)
1296 {
1297 int len = 1, i;
1298
1299 if (msg[0] == EXTENDED_MESSAGE) {
1300 len = 2 + msg[1];
1301 if (len == 2)
1302 len += 256;
1303 for (i = 0; i < len; ++i)
1304 printk("%02x ", msg[i]);
1305 /* Identify */
1306 } else if (msg[0] & 0x80) {
1307 printk("%02x ", msg[0]);
1308 /* Normal One byte */
1309 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1310 printk("%02x ", msg[0]);
1311 /* Two byte */
1312 } else if (msg[0] <= 0x2f) {
1313 printk("%02x %02x", msg[0], msg[1]);
1314 len = 2;
1315 } else
1316 printk("%02x ", msg[0]);
1317 return len;
1318 }
1319 EXPORT_SYMBOL(spi_print_msg);
1320 #endif /* ! CONFIG_SCSI_CONSTANTS */
1321
1322 static int spi_device_match(struct attribute_container *cont,
1323 struct device *dev)
1324 {
1325 struct scsi_device *sdev;
1326 struct Scsi_Host *shost;
1327 struct spi_internal *i;
1328
1329 if (!scsi_is_sdev_device(dev))
1330 return 0;
1331
1332 sdev = to_scsi_device(dev);
1333 shost = sdev->host;
1334 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1335 != &spi_host_class.class)
1336 return 0;
1337 /* Note: this class has no device attributes, so it has
1338 * no per-HBA allocation and thus we don't need to distinguish
1339 * the attribute containers for the device */
1340 i = to_spi_internal(shost->transportt);
1341 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1342 return 0;
1343 return 1;
1344 }
1345
1346 static int spi_target_match(struct attribute_container *cont,
1347 struct device *dev)
1348 {
1349 struct Scsi_Host *shost;
1350 struct scsi_target *starget;
1351 struct spi_internal *i;
1352
1353 if (!scsi_is_target_device(dev))
1354 return 0;
1355
1356 shost = dev_to_shost(dev->parent);
1357 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1358 != &spi_host_class.class)
1359 return 0;
1360
1361 i = to_spi_internal(shost->transportt);
1362 starget = to_scsi_target(dev);
1363
1364 if (i->f->deny_binding && i->f->deny_binding(starget))
1365 return 0;
1366
1367 return &i->t.target_attrs.ac == cont;
1368 }
1369
1370 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1371 "spi_transport",
1372 spi_setup_transport_attrs,
1373 NULL,
1374 spi_target_configure);
1375
1376 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1377 spi_device_match,
1378 spi_device_configure);
1379
1380 static struct attribute *host_attributes[] = {
1381 &dev_attr_signalling.attr,
1382 NULL
1383 };
1384
1385 static struct attribute_group host_attribute_group = {
1386 .attrs = host_attributes,
1387 };
1388
1389 static int spi_host_configure(struct transport_container *tc,
1390 struct device *dev,
1391 struct device *cdev)
1392 {
1393 struct kobject *kobj = &cdev->kobj;
1394 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1395 struct spi_internal *si = to_spi_internal(shost->transportt);
1396 struct attribute *attr = &dev_attr_signalling.attr;
1397 int rc = 0;
1398
1399 if (si->f->set_signalling)
1400 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1401
1402 return rc;
1403 }
1404
1405 /* returns true if we should be showing the variable. Also
1406 * overloads the return by setting 1<<1 if the attribute should
1407 * be writeable */
1408 #define TARGET_ATTRIBUTE_HELPER(name) \
1409 (si->f->show_##name ? S_IRUGO : 0) | \
1410 (si->f->set_##name ? S_IWUSR : 0)
1411
1412 static mode_t target_attribute_is_visible(struct kobject *kobj,
1413 struct attribute *attr, int i)
1414 {
1415 struct device *cdev = container_of(kobj, struct device, kobj);
1416 struct scsi_target *starget = transport_class_to_starget(cdev);
1417 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1418 struct spi_internal *si = to_spi_internal(shost->transportt);
1419
1420 if (attr == &dev_attr_period.attr &&
1421 spi_support_sync(starget))
1422 return TARGET_ATTRIBUTE_HELPER(period);
1423 else if (attr == &dev_attr_min_period.attr &&
1424 spi_support_sync(starget))
1425 return TARGET_ATTRIBUTE_HELPER(period);
1426 else if (attr == &dev_attr_offset.attr &&
1427 spi_support_sync(starget))
1428 return TARGET_ATTRIBUTE_HELPER(offset);
1429 else if (attr == &dev_attr_max_offset.attr &&
1430 spi_support_sync(starget))
1431 return TARGET_ATTRIBUTE_HELPER(offset);
1432 else if (attr == &dev_attr_width.attr &&
1433 spi_support_wide(starget))
1434 return TARGET_ATTRIBUTE_HELPER(width);
1435 else if (attr == &dev_attr_max_width.attr &&
1436 spi_support_wide(starget))
1437 return TARGET_ATTRIBUTE_HELPER(width);
1438 else if (attr == &dev_attr_iu.attr &&
1439 spi_support_ius(starget))
1440 return TARGET_ATTRIBUTE_HELPER(iu);
1441 else if (attr == &dev_attr_max_iu.attr &&
1442 spi_support_ius(starget))
1443 return TARGET_ATTRIBUTE_HELPER(iu);
1444 else if (attr == &dev_attr_dt.attr &&
1445 spi_support_dt(starget))
1446 return TARGET_ATTRIBUTE_HELPER(dt);
1447 else if (attr == &dev_attr_qas.attr &&
1448 spi_support_qas(starget))
1449 return TARGET_ATTRIBUTE_HELPER(qas);
1450 else if (attr == &dev_attr_max_qas.attr &&
1451 spi_support_qas(starget))
1452 return TARGET_ATTRIBUTE_HELPER(qas);
1453 else if (attr == &dev_attr_wr_flow.attr &&
1454 spi_support_ius(starget))
1455 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1456 else if (attr == &dev_attr_rd_strm.attr &&
1457 spi_support_ius(starget))
1458 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1459 else if (attr == &dev_attr_rti.attr &&
1460 spi_support_ius(starget))
1461 return TARGET_ATTRIBUTE_HELPER(rti);
1462 else if (attr == &dev_attr_pcomp_en.attr &&
1463 spi_support_ius(starget))
1464 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1465 else if (attr == &dev_attr_hold_mcs.attr &&
1466 spi_support_ius(starget))
1467 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1468 else if (attr == &dev_attr_revalidate.attr)
1469 return S_IWUSR;
1470
1471 return 0;
1472 }
1473
1474 static struct attribute *target_attributes[] = {
1475 &dev_attr_period.attr,
1476 &dev_attr_min_period.attr,
1477 &dev_attr_offset.attr,
1478 &dev_attr_max_offset.attr,
1479 &dev_attr_width.attr,
1480 &dev_attr_max_width.attr,
1481 &dev_attr_iu.attr,
1482 &dev_attr_max_iu.attr,
1483 &dev_attr_dt.attr,
1484 &dev_attr_qas.attr,
1485 &dev_attr_max_qas.attr,
1486 &dev_attr_wr_flow.attr,
1487 &dev_attr_rd_strm.attr,
1488 &dev_attr_rti.attr,
1489 &dev_attr_pcomp_en.attr,
1490 &dev_attr_hold_mcs.attr,
1491 &dev_attr_revalidate.attr,
1492 NULL
1493 };
1494
1495 static struct attribute_group target_attribute_group = {
1496 .attrs = target_attributes,
1497 .is_visible = target_attribute_is_visible,
1498 };
1499
1500 static int spi_target_configure(struct transport_container *tc,
1501 struct device *dev,
1502 struct device *cdev)
1503 {
1504 struct kobject *kobj = &cdev->kobj;
1505
1506 /* force an update based on parameters read from the device */
1507 sysfs_update_group(kobj, &target_attribute_group);
1508
1509 return 0;
1510 }
1511
1512 struct scsi_transport_template *
1513 spi_attach_transport(struct spi_function_template *ft)
1514 {
1515 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1516 GFP_KERNEL);
1517
1518 if (unlikely(!i))
1519 return NULL;
1520
1521 i->t.target_attrs.ac.class = &spi_transport_class.class;
1522 i->t.target_attrs.ac.grp = &target_attribute_group;
1523 i->t.target_attrs.ac.match = spi_target_match;
1524 transport_container_register(&i->t.target_attrs);
1525 i->t.target_size = sizeof(struct spi_transport_attrs);
1526 i->t.host_attrs.ac.class = &spi_host_class.class;
1527 i->t.host_attrs.ac.grp = &host_attribute_group;
1528 i->t.host_attrs.ac.match = spi_host_match;
1529 transport_container_register(&i->t.host_attrs);
1530 i->t.host_size = sizeof(struct spi_host_attrs);
1531 i->f = ft;
1532
1533 return &i->t;
1534 }
1535 EXPORT_SYMBOL(spi_attach_transport);
1536
1537 void spi_release_transport(struct scsi_transport_template *t)
1538 {
1539 struct spi_internal *i = to_spi_internal(t);
1540
1541 transport_container_unregister(&i->t.target_attrs);
1542 transport_container_unregister(&i->t.host_attrs);
1543
1544 kfree(i);
1545 }
1546 EXPORT_SYMBOL(spi_release_transport);
1547
1548 static __init int spi_transport_init(void)
1549 {
1550 int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
1551 "SCSI Parallel Transport Class");
1552 if (!error) {
1553 int i;
1554
1555 for (i = 0; spi_static_device_list[i].vendor; i++)
1556 scsi_dev_info_list_add_keyed(1, /* compatible */
1557 spi_static_device_list[i].vendor,
1558 spi_static_device_list[i].model,
1559 NULL,
1560 spi_static_device_list[i].flags,
1561 SCSI_DEVINFO_SPI);
1562 }
1563
1564 error = transport_class_register(&spi_transport_class);
1565 if (error)
1566 return error;
1567 error = anon_transport_class_register(&spi_device_class);
1568 return transport_class_register(&spi_host_class);
1569 }
1570
1571 static void __exit spi_transport_exit(void)
1572 {
1573 transport_class_unregister(&spi_transport_class);
1574 anon_transport_class_unregister(&spi_device_class);
1575 transport_class_unregister(&spi_host_class);
1576 scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
1577 }
1578
1579 MODULE_AUTHOR("Martin Hicks");
1580 MODULE_DESCRIPTION("SPI Transport Attributes");
1581 MODULE_LICENSE("GPL");
1582
1583 module_init(spi_transport_init);
1584 module_exit(spi_transport_exit);