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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 <linux/slab.h> |
29 | #include <scsi/scsi.h> |
30 | #include "scsi_priv.h" |
31 | #include <scsi/scsi_device.h> |
32 | #include <scsi/scsi_host.h> |
33 | #include <scsi/scsi_cmnd.h> |
34 | #include <scsi/scsi_eh.h> |
35 | #include <scsi/scsi_transport.h> |
36 | #include <scsi/scsi_transport_spi.h> |
37 | |
38 | #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */ |
39 | #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always |
40 | * on" attributes */ |
41 | #define SPI_HOST_ATTRS 1 |
42 | |
43 | #define SPI_MAX_ECHO_BUFFER_SIZE 4096 |
44 | |
45 | #define DV_LOOPS 3 |
46 | #define DV_TIMEOUT (10*HZ) |
47 | #define DV_RETRIES 3 /* should only need at most |
48 | * two cc/ua clears */ |
49 | |
50 | /* Our blacklist flags */ |
51 | enum { |
52 | SPI_BLIST_NOIUS = 0x1, |
53 | }; |
54 | |
55 | /* blacklist table, modelled on scsi_devinfo.c */ |
56 | static struct { |
57 | char *vendor; |
58 | char *model; |
59 | unsigned flags; |
60 | } spi_static_device_list[] __initdata = { |
61 | {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS }, |
62 | {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS }, |
63 | {NULL, NULL, 0} |
64 | }; |
65 | |
66 | /* Private data accessors (keep these out of the header file) */ |
67 | #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress) |
68 | #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex) |
69 | |
70 | struct spi_internal { |
71 | struct scsi_transport_template t; |
72 | struct spi_function_template *f; |
73 | }; |
74 | |
75 | #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t) |
76 | |
77 | static const int ppr_to_ps[] = { |
78 | /* The PPR values 0-6 are reserved, fill them in when |
79 | * the committee defines them */ |
80 | -1, /* 0x00 */ |
81 | -1, /* 0x01 */ |
82 | -1, /* 0x02 */ |
83 | -1, /* 0x03 */ |
84 | -1, /* 0x04 */ |
85 | -1, /* 0x05 */ |
86 | -1, /* 0x06 */ |
87 | 3125, /* 0x07 */ |
88 | 6250, /* 0x08 */ |
89 | 12500, /* 0x09 */ |
90 | 25000, /* 0x0a */ |
91 | 30300, /* 0x0b */ |
92 | 50000, /* 0x0c */ |
93 | }; |
94 | /* The PPR values at which you calculate the period in ns by multiplying |
95 | * by 4 */ |
96 | #define SPI_STATIC_PPR 0x0c |
97 | |
98 | static int sprint_frac(char *dest, int value, int denom) |
99 | { |
100 | int frac = value % denom; |
101 | int result = sprintf(dest, "%d", value / denom); |
102 | |
103 | if (frac == 0) |
104 | return result; |
105 | dest[result++] = '.'; |
106 | |
107 | do { |
108 | denom /= 10; |
109 | sprintf(dest + result, "%d", frac / denom); |
110 | result++; |
111 | frac %= denom; |
112 | } while (frac); |
113 | |
114 | dest[result++] = '\0'; |
115 | return result; |
116 | } |
117 | |
118 | static int spi_execute(struct scsi_device *sdev, const void *cmd, |
119 | enum dma_data_direction dir, |
120 | void *buffer, unsigned bufflen, |
121 | struct scsi_sense_hdr *sshdr) |
122 | { |
123 | int i, result; |
124 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
125 | |
126 | for(i = 0; i < DV_RETRIES; i++) { |
127 | result = scsi_execute(sdev, cmd, dir, buffer, bufflen, |
128 | sense, DV_TIMEOUT, /* retries */ 1, |
129 | REQ_FAILFAST_DEV | |
130 | REQ_FAILFAST_TRANSPORT | |
131 | REQ_FAILFAST_DRIVER, |
132 | NULL); |
133 | if (driver_byte(result) & DRIVER_SENSE) { |
134 | struct scsi_sense_hdr sshdr_tmp; |
135 | if (!sshdr) |
136 | sshdr = &sshdr_tmp; |
137 | |
138 | if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, |
139 | sshdr) |
140 | && sshdr->sense_key == UNIT_ATTENTION) |
141 | continue; |
142 | } |
143 | break; |
144 | } |
145 | return result; |
146 | } |
147 | |
148 | static struct { |
149 | enum spi_signal_type value; |
150 | char *name; |
151 | } signal_types[] = { |
152 | { SPI_SIGNAL_UNKNOWN, "unknown" }, |
153 | { SPI_SIGNAL_SE, "SE" }, |
154 | { SPI_SIGNAL_LVD, "LVD" }, |
155 | { SPI_SIGNAL_HVD, "HVD" }, |
156 | }; |
157 | |
158 | static inline const char *spi_signal_to_string(enum spi_signal_type type) |
159 | { |
160 | int i; |
161 | |
162 | for (i = 0; i < ARRAY_SIZE(signal_types); i++) { |
163 | if (type == signal_types[i].value) |
164 | return signal_types[i].name; |
165 | } |
166 | return NULL; |
167 | } |
168 | static inline enum spi_signal_type spi_signal_to_value(const char *name) |
169 | { |
170 | int i, len; |
171 | |
172 | for (i = 0; i < ARRAY_SIZE(signal_types); i++) { |
173 | len = strlen(signal_types[i].name); |
174 | if (strncmp(name, signal_types[i].name, len) == 0 && |
175 | (name[len] == '\n' || name[len] == '\0')) |
176 | return signal_types[i].value; |
177 | } |
178 | return SPI_SIGNAL_UNKNOWN; |
179 | } |
180 | |
181 | static int spi_host_setup(struct transport_container *tc, struct device *dev, |
182 | struct device *cdev) |
183 | { |
184 | struct Scsi_Host *shost = dev_to_shost(dev); |
185 | |
186 | spi_signalling(shost) = SPI_SIGNAL_UNKNOWN; |
187 | |
188 | return 0; |
189 | } |
190 | |
191 | static int spi_host_configure(struct transport_container *tc, |
192 | struct device *dev, |
193 | struct device *cdev); |
194 | |
195 | static DECLARE_TRANSPORT_CLASS(spi_host_class, |
196 | "spi_host", |
197 | spi_host_setup, |
198 | NULL, |
199 | spi_host_configure); |
200 | |
201 | static int spi_host_match(struct attribute_container *cont, |
202 | struct device *dev) |
203 | { |
204 | struct Scsi_Host *shost; |
205 | |
206 | if (!scsi_is_host_device(dev)) |
207 | return 0; |
208 | |
209 | shost = dev_to_shost(dev); |
210 | if (!shost->transportt || shost->transportt->host_attrs.ac.class |
211 | != &spi_host_class.class) |
212 | return 0; |
213 | |
214 | return &shost->transportt->host_attrs.ac == cont; |
215 | } |
216 | |
217 | static int spi_target_configure(struct transport_container *tc, |
218 | struct device *dev, |
219 | struct device *cdev); |
220 | |
221 | static int spi_device_configure(struct transport_container *tc, |
222 | struct device *dev, |
223 | struct device *cdev) |
224 | { |
225 | struct scsi_device *sdev = to_scsi_device(dev); |
226 | struct scsi_target *starget = sdev->sdev_target; |
227 | unsigned bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8], |
228 | &sdev->inquiry[16], |
229 | SCSI_DEVINFO_SPI); |
230 | |
231 | /* Populate the target capability fields with the values |
232 | * gleaned from the device inquiry */ |
233 | |
234 | spi_support_sync(starget) = scsi_device_sync(sdev); |
235 | spi_support_wide(starget) = scsi_device_wide(sdev); |
236 | spi_support_dt(starget) = scsi_device_dt(sdev); |
237 | spi_support_dt_only(starget) = scsi_device_dt_only(sdev); |
238 | spi_support_ius(starget) = scsi_device_ius(sdev); |
239 | if (bflags & SPI_BLIST_NOIUS) { |
240 | dev_info(dev, "Information Units disabled by blacklist\n"); |
241 | spi_support_ius(starget) = 0; |
242 | } |
243 | spi_support_qas(starget) = scsi_device_qas(sdev); |
244 | |
245 | return 0; |
246 | } |
247 | |
248 | static int spi_setup_transport_attrs(struct transport_container *tc, |
249 | struct device *dev, |
250 | struct device *cdev) |
251 | { |
252 | struct scsi_target *starget = to_scsi_target(dev); |
253 | |
254 | spi_period(starget) = -1; /* illegal value */ |
255 | spi_min_period(starget) = 0; |
256 | spi_offset(starget) = 0; /* async */ |
257 | spi_max_offset(starget) = 255; |
258 | spi_width(starget) = 0; /* narrow */ |
259 | spi_max_width(starget) = 1; |
260 | spi_iu(starget) = 0; /* no IU */ |
261 | spi_max_iu(starget) = 1; |
262 | spi_dt(starget) = 0; /* ST */ |
263 | spi_qas(starget) = 0; |
264 | spi_max_qas(starget) = 1; |
265 | spi_wr_flow(starget) = 0; |
266 | spi_rd_strm(starget) = 0; |
267 | spi_rti(starget) = 0; |
268 | spi_pcomp_en(starget) = 0; |
269 | spi_hold_mcs(starget) = 0; |
270 | spi_dv_pending(starget) = 0; |
271 | spi_dv_in_progress(starget) = 0; |
272 | spi_initial_dv(starget) = 0; |
273 | mutex_init(&spi_dv_mutex(starget)); |
274 | |
275 | return 0; |
276 | } |
277 | |
278 | #define spi_transport_show_simple(field, format_string) \ |
279 | \ |
280 | static ssize_t \ |
281 | show_spi_transport_##field(struct device *dev, \ |
282 | struct device_attribute *attr, char *buf) \ |
283 | { \ |
284 | struct scsi_target *starget = transport_class_to_starget(dev); \ |
285 | struct spi_transport_attrs *tp; \ |
286 | \ |
287 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ |
288 | return snprintf(buf, 20, format_string, tp->field); \ |
289 | } |
290 | |
291 | #define spi_transport_store_simple(field, format_string) \ |
292 | \ |
293 | static ssize_t \ |
294 | store_spi_transport_##field(struct device *dev, \ |
295 | struct device_attribute *attr, \ |
296 | const char *buf, size_t count) \ |
297 | { \ |
298 | int val; \ |
299 | struct scsi_target *starget = transport_class_to_starget(dev); \ |
300 | struct spi_transport_attrs *tp; \ |
301 | \ |
302 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ |
303 | val = simple_strtoul(buf, NULL, 0); \ |
304 | tp->field = val; \ |
305 | return count; \ |
306 | } |
307 | |
308 | #define spi_transport_show_function(field, format_string) \ |
309 | \ |
310 | static ssize_t \ |
311 | show_spi_transport_##field(struct device *dev, \ |
312 | struct device_attribute *attr, char *buf) \ |
313 | { \ |
314 | struct scsi_target *starget = transport_class_to_starget(dev); \ |
315 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ |
316 | struct spi_transport_attrs *tp; \ |
317 | struct spi_internal *i = to_spi_internal(shost->transportt); \ |
318 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ |
319 | if (i->f->get_##field) \ |
320 | i->f->get_##field(starget); \ |
321 | return snprintf(buf, 20, format_string, tp->field); \ |
322 | } |
323 | |
324 | #define spi_transport_store_function(field, format_string) \ |
325 | static ssize_t \ |
326 | store_spi_transport_##field(struct device *dev, \ |
327 | struct device_attribute *attr, \ |
328 | const char *buf, size_t count) \ |
329 | { \ |
330 | int val; \ |
331 | struct scsi_target *starget = transport_class_to_starget(dev); \ |
332 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ |
333 | struct spi_internal *i = to_spi_internal(shost->transportt); \ |
334 | \ |
335 | if (!i->f->set_##field) \ |
336 | return -EINVAL; \ |
337 | val = simple_strtoul(buf, NULL, 0); \ |
338 | i->f->set_##field(starget, val); \ |
339 | return count; \ |
340 | } |
341 | |
342 | #define spi_transport_store_max(field, format_string) \ |
343 | static ssize_t \ |
344 | store_spi_transport_##field(struct device *dev, \ |
345 | struct device_attribute *attr, \ |
346 | const char *buf, size_t count) \ |
347 | { \ |
348 | int val; \ |
349 | struct scsi_target *starget = transport_class_to_starget(dev); \ |
350 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ |
351 | struct spi_internal *i = to_spi_internal(shost->transportt); \ |
352 | struct spi_transport_attrs *tp \ |
353 | = (struct spi_transport_attrs *)&starget->starget_data; \ |
354 | \ |
355 | if (i->f->set_##field) \ |
356 | return -EINVAL; \ |
357 | val = simple_strtoul(buf, NULL, 0); \ |
358 | if (val > tp->max_##field) \ |
359 | val = tp->max_##field; \ |
360 | i->f->set_##field(starget, val); \ |
361 | return count; \ |
362 | } |
363 | |
364 | #define spi_transport_rd_attr(field, format_string) \ |
365 | spi_transport_show_function(field, format_string) \ |
366 | spi_transport_store_function(field, format_string) \ |
367 | static DEVICE_ATTR(field, S_IRUGO, \ |
368 | show_spi_transport_##field, \ |
369 | store_spi_transport_##field); |
370 | |
371 | #define spi_transport_simple_attr(field, format_string) \ |
372 | spi_transport_show_simple(field, format_string) \ |
373 | spi_transport_store_simple(field, format_string) \ |
374 | static DEVICE_ATTR(field, S_IRUGO, \ |
375 | show_spi_transport_##field, \ |
376 | store_spi_transport_##field); |
377 | |
378 | #define spi_transport_max_attr(field, format_string) \ |
379 | spi_transport_show_function(field, format_string) \ |
380 | spi_transport_store_max(field, format_string) \ |
381 | spi_transport_simple_attr(max_##field, format_string) \ |
382 | static DEVICE_ATTR(field, S_IRUGO, \ |
383 | show_spi_transport_##field, \ |
384 | store_spi_transport_##field); |
385 | |
386 | /* The Parallel SCSI Tranport Attributes: */ |
387 | spi_transport_max_attr(offset, "%d\n"); |
388 | spi_transport_max_attr(width, "%d\n"); |
389 | spi_transport_max_attr(iu, "%d\n"); |
390 | spi_transport_rd_attr(dt, "%d\n"); |
391 | spi_transport_max_attr(qas, "%d\n"); |
392 | spi_transport_rd_attr(wr_flow, "%d\n"); |
393 | spi_transport_rd_attr(rd_strm, "%d\n"); |
394 | spi_transport_rd_attr(rti, "%d\n"); |
395 | spi_transport_rd_attr(pcomp_en, "%d\n"); |
396 | spi_transport_rd_attr(hold_mcs, "%d\n"); |
397 | |
398 | /* we only care about the first child device that's a real SCSI device |
399 | * so we return 1 to terminate the iteration when we find it */ |
400 | static int child_iter(struct device *dev, void *data) |
401 | { |
402 | if (!scsi_is_sdev_device(dev)) |
403 | return 0; |
404 | |
405 | spi_dv_device(to_scsi_device(dev)); |
406 | return 1; |
407 | } |
408 | |
409 | static ssize_t |
410 | store_spi_revalidate(struct device *dev, struct device_attribute *attr, |
411 | const char *buf, size_t count) |
412 | { |
413 | struct scsi_target *starget = transport_class_to_starget(dev); |
414 | |
415 | device_for_each_child(&starget->dev, NULL, child_iter); |
416 | return count; |
417 | } |
418 | static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); |
419 | |
420 | /* Translate the period into ns according to the current spec |
421 | * for SDTR/PPR messages */ |
422 | static int period_to_str(char *buf, int period) |
423 | { |
424 | int len, picosec; |
425 | |
426 | if (period < 0 || period > 0xff) { |
427 | picosec = -1; |
428 | } else if (period <= SPI_STATIC_PPR) { |
429 | picosec = ppr_to_ps[period]; |
430 | } else { |
431 | picosec = period * 4000; |
432 | } |
433 | |
434 | if (picosec == -1) { |
435 | len = sprintf(buf, "reserved"); |
436 | } else { |
437 | len = sprint_frac(buf, picosec, 1000); |
438 | } |
439 | |
440 | return len; |
441 | } |
442 | |
443 | static ssize_t |
444 | show_spi_transport_period_helper(char *buf, int period) |
445 | { |
446 | int len = period_to_str(buf, period); |
447 | buf[len++] = '\n'; |
448 | buf[len] = '\0'; |
449 | return len; |
450 | } |
451 | |
452 | static ssize_t |
453 | store_spi_transport_period_helper(struct device *dev, const char *buf, |
454 | size_t count, int *periodp) |
455 | { |
456 | int j, picosec, period = -1; |
457 | char *endp; |
458 | |
459 | picosec = simple_strtoul(buf, &endp, 10) * 1000; |
460 | if (*endp == '.') { |
461 | int mult = 100; |
462 | do { |
463 | endp++; |
464 | if (!isdigit(*endp)) |
465 | break; |
466 | picosec += (*endp - '0') * mult; |
467 | mult /= 10; |
468 | } while (mult > 0); |
469 | } |
470 | |
471 | for (j = 0; j <= SPI_STATIC_PPR; j++) { |
472 | if (ppr_to_ps[j] < picosec) |
473 | continue; |
474 | period = j; |
475 | break; |
476 | } |
477 | |
478 | if (period == -1) |
479 | period = picosec / 4000; |
480 | |
481 | if (period > 0xff) |
482 | period = 0xff; |
483 | |
484 | *periodp = period; |
485 | |
486 | return count; |
487 | } |
488 | |
489 | static ssize_t |
490 | show_spi_transport_period(struct device *dev, |
491 | struct device_attribute *attr, char *buf) |
492 | { |
493 | struct scsi_target *starget = transport_class_to_starget(dev); |
494 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
495 | struct spi_internal *i = to_spi_internal(shost->transportt); |
496 | struct spi_transport_attrs *tp = |
497 | (struct spi_transport_attrs *)&starget->starget_data; |
498 | |
499 | if (i->f->get_period) |
500 | i->f->get_period(starget); |
501 | |
502 | return show_spi_transport_period_helper(buf, tp->period); |
503 | } |
504 | |
505 | static ssize_t |
506 | store_spi_transport_period(struct device *cdev, struct device_attribute *attr, |
507 | const char *buf, size_t count) |
508 | { |
509 | struct scsi_target *starget = transport_class_to_starget(cdev); |
510 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
511 | struct spi_internal *i = to_spi_internal(shost->transportt); |
512 | struct spi_transport_attrs *tp = |
513 | (struct spi_transport_attrs *)&starget->starget_data; |
514 | int period, retval; |
515 | |
516 | if (!i->f->set_period) |
517 | return -EINVAL; |
518 | |
519 | retval = store_spi_transport_period_helper(cdev, buf, count, &period); |
520 | |
521 | if (period < tp->min_period) |
522 | period = tp->min_period; |
523 | |
524 | i->f->set_period(starget, period); |
525 | |
526 | return retval; |
527 | } |
528 | |
529 | static DEVICE_ATTR(period, S_IRUGO, |
530 | show_spi_transport_period, |
531 | store_spi_transport_period); |
532 | |
533 | static ssize_t |
534 | show_spi_transport_min_period(struct device *cdev, |
535 | struct device_attribute *attr, char *buf) |
536 | { |
537 | struct scsi_target *starget = transport_class_to_starget(cdev); |
538 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
539 | struct spi_internal *i = to_spi_internal(shost->transportt); |
540 | struct spi_transport_attrs *tp = |
541 | (struct spi_transport_attrs *)&starget->starget_data; |
542 | |
543 | if (!i->f->set_period) |
544 | return -EINVAL; |
545 | |
546 | return show_spi_transport_period_helper(buf, tp->min_period); |
547 | } |
548 | |
549 | static ssize_t |
550 | store_spi_transport_min_period(struct device *cdev, |
551 | struct device_attribute *attr, |
552 | const char *buf, size_t count) |
553 | { |
554 | struct scsi_target *starget = transport_class_to_starget(cdev); |
555 | struct spi_transport_attrs *tp = |
556 | (struct spi_transport_attrs *)&starget->starget_data; |
557 | |
558 | return store_spi_transport_period_helper(cdev, buf, count, |
559 | &tp->min_period); |
560 | } |
561 | |
562 | |
563 | static DEVICE_ATTR(min_period, S_IRUGO, |
564 | show_spi_transport_min_period, |
565 | store_spi_transport_min_period); |
566 | |
567 | |
568 | static ssize_t show_spi_host_signalling(struct device *cdev, |
569 | struct device_attribute *attr, |
570 | char *buf) |
571 | { |
572 | struct Scsi_Host *shost = transport_class_to_shost(cdev); |
573 | struct spi_internal *i = to_spi_internal(shost->transportt); |
574 | |
575 | if (i->f->get_signalling) |
576 | i->f->get_signalling(shost); |
577 | |
578 | return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); |
579 | } |
580 | static ssize_t store_spi_host_signalling(struct device *dev, |
581 | struct device_attribute *attr, |
582 | const char *buf, size_t count) |
583 | { |
584 | struct Scsi_Host *shost = transport_class_to_shost(dev); |
585 | struct spi_internal *i = to_spi_internal(shost->transportt); |
586 | enum spi_signal_type type = spi_signal_to_value(buf); |
587 | |
588 | if (!i->f->set_signalling) |
589 | return -EINVAL; |
590 | |
591 | if (type != SPI_SIGNAL_UNKNOWN) |
592 | i->f->set_signalling(shost, type); |
593 | |
594 | return count; |
595 | } |
596 | static DEVICE_ATTR(signalling, S_IRUGO, |
597 | show_spi_host_signalling, |
598 | store_spi_host_signalling); |
599 | |
600 | static ssize_t show_spi_host_width(struct device *cdev, |
601 | struct device_attribute *attr, |
602 | char *buf) |
603 | { |
604 | struct Scsi_Host *shost = transport_class_to_shost(cdev); |
605 | |
606 | return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow"); |
607 | } |
608 | static DEVICE_ATTR(host_width, S_IRUGO, |
609 | show_spi_host_width, NULL); |
610 | |
611 | static ssize_t show_spi_host_hba_id(struct device *cdev, |
612 | struct device_attribute *attr, |
613 | char *buf) |
614 | { |
615 | struct Scsi_Host *shost = transport_class_to_shost(cdev); |
616 | |
617 | return sprintf(buf, "%d\n", shost->this_id); |
618 | } |
619 | static DEVICE_ATTR(hba_id, S_IRUGO, |
620 | show_spi_host_hba_id, NULL); |
621 | |
622 | #define DV_SET(x, y) \ |
623 | if(i->f->set_##x) \ |
624 | i->f->set_##x(sdev->sdev_target, y) |
625 | |
626 | enum spi_compare_returns { |
627 | SPI_COMPARE_SUCCESS, |
628 | SPI_COMPARE_FAILURE, |
629 | SPI_COMPARE_SKIP_TEST, |
630 | }; |
631 | |
632 | |
633 | /* This is for read/write Domain Validation: If the device supports |
634 | * an echo buffer, we do read/write tests to it */ |
635 | static enum spi_compare_returns |
636 | spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, |
637 | u8 *ptr, const int retries) |
638 | { |
639 | int len = ptr - buffer; |
640 | int j, k, r, result; |
641 | unsigned int pattern = 0x0000ffff; |
642 | struct scsi_sense_hdr sshdr; |
643 | |
644 | const char spi_write_buffer[] = { |
645 | WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 |
646 | }; |
647 | const char spi_read_buffer[] = { |
648 | READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 |
649 | }; |
650 | |
651 | /* set up the pattern buffer. Doesn't matter if we spill |
652 | * slightly beyond since that's where the read buffer is */ |
653 | for (j = 0; j < len; ) { |
654 | |
655 | /* fill the buffer with counting (test a) */ |
656 | for ( ; j < min(len, 32); j++) |
657 | buffer[j] = j; |
658 | k = j; |
659 | /* fill the buffer with alternating words of 0x0 and |
660 | * 0xffff (test b) */ |
661 | for ( ; j < min(len, k + 32); j += 2) { |
662 | u16 *word = (u16 *)&buffer[j]; |
663 | |
664 | *word = (j & 0x02) ? 0x0000 : 0xffff; |
665 | } |
666 | k = j; |
667 | /* fill with crosstalk (alternating 0x5555 0xaaa) |
668 | * (test c) */ |
669 | for ( ; j < min(len, k + 32); j += 2) { |
670 | u16 *word = (u16 *)&buffer[j]; |
671 | |
672 | *word = (j & 0x02) ? 0x5555 : 0xaaaa; |
673 | } |
674 | k = j; |
675 | /* fill with shifting bits (test d) */ |
676 | for ( ; j < min(len, k + 32); j += 4) { |
677 | u32 *word = (unsigned int *)&buffer[j]; |
678 | u32 roll = (pattern & 0x80000000) ? 1 : 0; |
679 | |
680 | *word = pattern; |
681 | pattern = (pattern << 1) | roll; |
682 | } |
683 | /* don't bother with random data (test e) */ |
684 | } |
685 | |
686 | for (r = 0; r < retries; r++) { |
687 | result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE, |
688 | buffer, len, &sshdr); |
689 | if(result || !scsi_device_online(sdev)) { |
690 | |
691 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
692 | if (scsi_sense_valid(&sshdr) |
693 | && sshdr.sense_key == ILLEGAL_REQUEST |
694 | /* INVALID FIELD IN CDB */ |
695 | && sshdr.asc == 0x24 && sshdr.ascq == 0x00) |
696 | /* This would mean that the drive lied |
697 | * to us about supporting an echo |
698 | * buffer (unfortunately some Western |
699 | * Digital drives do precisely this) |
700 | */ |
701 | return SPI_COMPARE_SKIP_TEST; |
702 | |
703 | |
704 | sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); |
705 | return SPI_COMPARE_FAILURE; |
706 | } |
707 | |
708 | memset(ptr, 0, len); |
709 | spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE, |
710 | ptr, len, NULL); |
711 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
712 | |
713 | if (memcmp(buffer, ptr, len) != 0) |
714 | return SPI_COMPARE_FAILURE; |
715 | } |
716 | return SPI_COMPARE_SUCCESS; |
717 | } |
718 | |
719 | /* This is for the simplest form of Domain Validation: a read test |
720 | * on the inquiry data from the device */ |
721 | static enum spi_compare_returns |
722 | spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, |
723 | u8 *ptr, const int retries) |
724 | { |
725 | int r, result; |
726 | const int len = sdev->inquiry_len; |
727 | const char spi_inquiry[] = { |
728 | INQUIRY, 0, 0, 0, len, 0 |
729 | }; |
730 | |
731 | for (r = 0; r < retries; r++) { |
732 | memset(ptr, 0, len); |
733 | |
734 | result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE, |
735 | ptr, len, NULL); |
736 | |
737 | if(result || !scsi_device_online(sdev)) { |
738 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
739 | return SPI_COMPARE_FAILURE; |
740 | } |
741 | |
742 | /* If we don't have the inquiry data already, the |
743 | * first read gets it */ |
744 | if (ptr == buffer) { |
745 | ptr += len; |
746 | --r; |
747 | continue; |
748 | } |
749 | |
750 | if (memcmp(buffer, ptr, len) != 0) |
751 | /* failure */ |
752 | return SPI_COMPARE_FAILURE; |
753 | } |
754 | return SPI_COMPARE_SUCCESS; |
755 | } |
756 | |
757 | static enum spi_compare_returns |
758 | spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, |
759 | enum spi_compare_returns |
760 | (*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) |
761 | { |
762 | struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
763 | struct scsi_target *starget = sdev->sdev_target; |
764 | int period = 0, prevperiod = 0; |
765 | enum spi_compare_returns retval; |
766 | |
767 | |
768 | for (;;) { |
769 | int newperiod; |
770 | retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); |
771 | |
772 | if (retval == SPI_COMPARE_SUCCESS |
773 | || retval == SPI_COMPARE_SKIP_TEST) |
774 | break; |
775 | |
776 | /* OK, retrain, fallback */ |
777 | if (i->f->get_iu) |
778 | i->f->get_iu(starget); |
779 | if (i->f->get_qas) |
780 | i->f->get_qas(starget); |
781 | if (i->f->get_period) |
782 | i->f->get_period(sdev->sdev_target); |
783 | |
784 | /* Here's the fallback sequence; first try turning off |
785 | * IU, then QAS (if we can control them), then finally |
786 | * fall down the periods */ |
787 | if (i->f->set_iu && spi_iu(starget)) { |
788 | starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n"); |
789 | DV_SET(iu, 0); |
790 | } else if (i->f->set_qas && spi_qas(starget)) { |
791 | starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n"); |
792 | DV_SET(qas, 0); |
793 | } else { |
794 | newperiod = spi_period(starget); |
795 | period = newperiod > period ? newperiod : period; |
796 | if (period < 0x0d) |
797 | period++; |
798 | else |
799 | period += period >> 1; |
800 | |
801 | if (unlikely(period > 0xff || period == prevperiod)) { |
802 | /* Total failure; set to async and return */ |
803 | starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); |
804 | DV_SET(offset, 0); |
805 | return SPI_COMPARE_FAILURE; |
806 | } |
807 | starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); |
808 | DV_SET(period, period); |
809 | prevperiod = period; |
810 | } |
811 | } |
812 | return retval; |
813 | } |
814 | |
815 | static int |
816 | spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) |
817 | { |
818 | int l, result; |
819 | |
820 | /* first off do a test unit ready. This can error out |
821 | * because of reservations or some other reason. If it |
822 | * fails, the device won't let us write to the echo buffer |
823 | * so just return failure */ |
824 | |
825 | const char spi_test_unit_ready[] = { |
826 | TEST_UNIT_READY, 0, 0, 0, 0, 0 |
827 | }; |
828 | |
829 | const char spi_read_buffer_descriptor[] = { |
830 | READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 |
831 | }; |
832 | |
833 | |
834 | /* We send a set of three TURs to clear any outstanding |
835 | * unit attention conditions if they exist (Otherwise the |
836 | * buffer tests won't be happy). If the TUR still fails |
837 | * (reservation conflict, device not ready, etc) just |
838 | * skip the write tests */ |
839 | for (l = 0; ; l++) { |
840 | result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, |
841 | NULL, 0, NULL); |
842 | |
843 | if(result) { |
844 | if(l >= 3) |
845 | return 0; |
846 | } else { |
847 | /* TUR succeeded */ |
848 | break; |
849 | } |
850 | } |
851 | |
852 | result = spi_execute(sdev, spi_read_buffer_descriptor, |
853 | DMA_FROM_DEVICE, buffer, 4, NULL); |
854 | |
855 | if (result) |
856 | /* Device has no echo buffer */ |
857 | return 0; |
858 | |
859 | return buffer[3] + ((buffer[2] & 0x1f) << 8); |
860 | } |
861 | |
862 | static void |
863 | spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) |
864 | { |
865 | struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
866 | struct scsi_target *starget = sdev->sdev_target; |
867 | struct Scsi_Host *shost = sdev->host; |
868 | int len = sdev->inquiry_len; |
869 | int min_period = spi_min_period(starget); |
870 | int max_width = spi_max_width(starget); |
871 | /* first set us up for narrow async */ |
872 | DV_SET(offset, 0); |
873 | DV_SET(width, 0); |
874 | |
875 | if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) |
876 | != SPI_COMPARE_SUCCESS) { |
877 | starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); |
878 | /* FIXME: should probably offline the device here? */ |
879 | return; |
880 | } |
881 | |
882 | if (!spi_support_wide(starget)) { |
883 | spi_max_width(starget) = 0; |
884 | max_width = 0; |
885 | } |
886 | |
887 | /* test width */ |
888 | if (i->f->set_width && max_width) { |
889 | i->f->set_width(starget, 1); |
890 | |
891 | if (spi_dv_device_compare_inquiry(sdev, buffer, |
892 | buffer + len, |
893 | DV_LOOPS) |
894 | != SPI_COMPARE_SUCCESS) { |
895 | starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); |
896 | i->f->set_width(starget, 0); |
897 | /* Make sure we don't force wide back on by asking |
898 | * for a transfer period that requires it */ |
899 | max_width = 0; |
900 | if (min_period < 10) |
901 | min_period = 10; |
902 | } |
903 | } |
904 | |
905 | if (!i->f->set_period) |
906 | return; |
907 | |
908 | /* device can't handle synchronous */ |
909 | if (!spi_support_sync(starget) && !spi_support_dt(starget)) |
910 | return; |
911 | |
912 | /* len == -1 is the signal that we need to ascertain the |
913 | * presence of an echo buffer before trying to use it. len == |
914 | * 0 means we don't have an echo buffer */ |
915 | len = -1; |
916 | |
917 | retry: |
918 | |
919 | /* now set up to the maximum */ |
920 | DV_SET(offset, spi_max_offset(starget)); |
921 | DV_SET(period, min_period); |
922 | |
923 | /* try QAS requests; this should be harmless to set if the |
924 | * target supports it */ |
925 | if (spi_support_qas(starget) && spi_max_qas(starget)) { |
926 | DV_SET(qas, 1); |
927 | } else { |
928 | DV_SET(qas, 0); |
929 | } |
930 | |
931 | if (spi_support_ius(starget) && spi_max_iu(starget) && |
932 | min_period < 9) { |
933 | /* This u320 (or u640). Set IU transfers */ |
934 | DV_SET(iu, 1); |
935 | /* Then set the optional parameters */ |
936 | DV_SET(rd_strm, 1); |
937 | DV_SET(wr_flow, 1); |
938 | DV_SET(rti, 1); |
939 | if (min_period == 8) |
940 | DV_SET(pcomp_en, 1); |
941 | } else { |
942 | DV_SET(iu, 0); |
943 | } |
944 | |
945 | /* now that we've done all this, actually check the bus |
946 | * signal type (if known). Some devices are stupid on |
947 | * a SE bus and still claim they can try LVD only settings */ |
948 | if (i->f->get_signalling) |
949 | i->f->get_signalling(shost); |
950 | if (spi_signalling(shost) == SPI_SIGNAL_SE || |
951 | spi_signalling(shost) == SPI_SIGNAL_HVD || |
952 | !spi_support_dt(starget)) { |
953 | DV_SET(dt, 0); |
954 | } else { |
955 | DV_SET(dt, 1); |
956 | } |
957 | /* set width last because it will pull all the other |
958 | * parameters down to required values */ |
959 | DV_SET(width, max_width); |
960 | |
961 | /* Do the read only INQUIRY tests */ |
962 | spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, |
963 | spi_dv_device_compare_inquiry); |
964 | /* See if we actually managed to negotiate and sustain DT */ |
965 | if (i->f->get_dt) |
966 | i->f->get_dt(starget); |
967 | |
968 | /* see if the device has an echo buffer. If it does we can do |
969 | * the SPI pattern write tests. Because of some broken |
970 | * devices, we *only* try this on a device that has actually |
971 | * negotiated DT */ |
972 | |
973 | if (len == -1 && spi_dt(starget)) |
974 | len = spi_dv_device_get_echo_buffer(sdev, buffer); |
975 | |
976 | if (len <= 0) { |
977 | starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); |
978 | return; |
979 | } |
980 | |
981 | if (len > SPI_MAX_ECHO_BUFFER_SIZE) { |
982 | starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); |
983 | len = SPI_MAX_ECHO_BUFFER_SIZE; |
984 | } |
985 | |
986 | if (spi_dv_retrain(sdev, buffer, buffer + len, |
987 | spi_dv_device_echo_buffer) |
988 | == SPI_COMPARE_SKIP_TEST) { |
989 | /* OK, the stupid drive can't do a write echo buffer |
990 | * test after all, fall back to the read tests */ |
991 | len = 0; |
992 | goto retry; |
993 | } |
994 | } |
995 | |
996 | |
997 | /** spi_dv_device - Do Domain Validation on the device |
998 | * @sdev: scsi device to validate |
999 | * |
1000 | * Performs the domain validation on the given device in the |
1001 | * current execution thread. Since DV operations may sleep, |
1002 | * the current thread must have user context. Also no SCSI |
1003 | * related locks that would deadlock I/O issued by the DV may |
1004 | * be held. |
1005 | */ |
1006 | void |
1007 | spi_dv_device(struct scsi_device *sdev) |
1008 | { |
1009 | struct scsi_target *starget = sdev->sdev_target; |
1010 | u8 *buffer; |
1011 | const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; |
1012 | |
1013 | if (unlikely(spi_dv_in_progress(starget))) |
1014 | return; |
1015 | |
1016 | if (unlikely(scsi_device_get(sdev))) |
1017 | return; |
1018 | spi_dv_in_progress(starget) = 1; |
1019 | |
1020 | buffer = kzalloc(len, GFP_KERNEL); |
1021 | |
1022 | if (unlikely(!buffer)) |
1023 | goto out_put; |
1024 | |
1025 | /* We need to verify that the actual device will quiesce; the |
1026 | * later target quiesce is just a nice to have */ |
1027 | if (unlikely(scsi_device_quiesce(sdev))) |
1028 | goto out_free; |
1029 | |
1030 | scsi_target_quiesce(starget); |
1031 | |
1032 | spi_dv_pending(starget) = 1; |
1033 | mutex_lock(&spi_dv_mutex(starget)); |
1034 | |
1035 | starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); |
1036 | |
1037 | spi_dv_device_internal(sdev, buffer); |
1038 | |
1039 | starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); |
1040 | |
1041 | mutex_unlock(&spi_dv_mutex(starget)); |
1042 | spi_dv_pending(starget) = 0; |
1043 | |
1044 | scsi_target_resume(starget); |
1045 | |
1046 | spi_initial_dv(starget) = 1; |
1047 | |
1048 | out_free: |
1049 | kfree(buffer); |
1050 | out_put: |
1051 | spi_dv_in_progress(starget) = 0; |
1052 | scsi_device_put(sdev); |
1053 | } |
1054 | EXPORT_SYMBOL(spi_dv_device); |
1055 | |
1056 | struct work_queue_wrapper { |
1057 | struct work_struct work; |
1058 | struct scsi_device *sdev; |
1059 | }; |
1060 | |
1061 | static void |
1062 | spi_dv_device_work_wrapper(struct work_struct *work) |
1063 | { |
1064 | struct work_queue_wrapper *wqw = |
1065 | container_of(work, struct work_queue_wrapper, work); |
1066 | struct scsi_device *sdev = wqw->sdev; |
1067 | |
1068 | kfree(wqw); |
1069 | spi_dv_device(sdev); |
1070 | spi_dv_pending(sdev->sdev_target) = 0; |
1071 | scsi_device_put(sdev); |
1072 | } |
1073 | |
1074 | |
1075 | /** |
1076 | * spi_schedule_dv_device - schedule domain validation to occur on the device |
1077 | * @sdev: The device to validate |
1078 | * |
1079 | * Identical to spi_dv_device() above, except that the DV will be |
1080 | * scheduled to occur in a workqueue later. All memory allocations |
1081 | * are atomic, so may be called from any context including those holding |
1082 | * SCSI locks. |
1083 | */ |
1084 | void |
1085 | spi_schedule_dv_device(struct scsi_device *sdev) |
1086 | { |
1087 | struct work_queue_wrapper *wqw = |
1088 | kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); |
1089 | |
1090 | if (unlikely(!wqw)) |
1091 | return; |
1092 | |
1093 | if (unlikely(spi_dv_pending(sdev->sdev_target))) { |
1094 | kfree(wqw); |
1095 | return; |
1096 | } |
1097 | /* Set pending early (dv_device doesn't check it, only sets it) */ |
1098 | spi_dv_pending(sdev->sdev_target) = 1; |
1099 | if (unlikely(scsi_device_get(sdev))) { |
1100 | kfree(wqw); |
1101 | spi_dv_pending(sdev->sdev_target) = 0; |
1102 | return; |
1103 | } |
1104 | |
1105 | INIT_WORK(&wqw->work, spi_dv_device_work_wrapper); |
1106 | wqw->sdev = sdev; |
1107 | |
1108 | schedule_work(&wqw->work); |
1109 | } |
1110 | EXPORT_SYMBOL(spi_schedule_dv_device); |
1111 | |
1112 | /** |
1113 | * spi_display_xfer_agreement - Print the current target transfer agreement |
1114 | * @starget: The target for which to display the agreement |
1115 | * |
1116 | * Each SPI port is required to maintain a transfer agreement for each |
1117 | * other port on the bus. This function prints a one-line summary of |
1118 | * the current agreement; more detailed information is available in sysfs. |
1119 | */ |
1120 | void spi_display_xfer_agreement(struct scsi_target *starget) |
1121 | { |
1122 | struct spi_transport_attrs *tp; |
1123 | tp = (struct spi_transport_attrs *)&starget->starget_data; |
1124 | |
1125 | if (tp->offset > 0 && tp->period > 0) { |
1126 | unsigned int picosec, kb100; |
1127 | char *scsi = "FAST-?"; |
1128 | char tmp[8]; |
1129 | |
1130 | if (tp->period <= SPI_STATIC_PPR) { |
1131 | picosec = ppr_to_ps[tp->period]; |
1132 | switch (tp->period) { |
1133 | case 7: scsi = "FAST-320"; break; |
1134 | case 8: scsi = "FAST-160"; break; |
1135 | case 9: scsi = "FAST-80"; break; |
1136 | case 10: |
1137 | case 11: scsi = "FAST-40"; break; |
1138 | case 12: scsi = "FAST-20"; break; |
1139 | } |
1140 | } else { |
1141 | picosec = tp->period * 4000; |
1142 | if (tp->period < 25) |
1143 | scsi = "FAST-20"; |
1144 | else if (tp->period < 50) |
1145 | scsi = "FAST-10"; |
1146 | else |
1147 | scsi = "FAST-5"; |
1148 | } |
1149 | |
1150 | kb100 = (10000000 + picosec / 2) / picosec; |
1151 | if (tp->width) |
1152 | kb100 *= 2; |
1153 | sprint_frac(tmp, picosec, 1000); |
1154 | |
1155 | dev_info(&starget->dev, |
1156 | "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", |
1157 | scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, |
1158 | tp->dt ? "DT" : "ST", |
1159 | tp->iu ? " IU" : "", |
1160 | tp->qas ? " QAS" : "", |
1161 | tp->rd_strm ? " RDSTRM" : "", |
1162 | tp->rti ? " RTI" : "", |
1163 | tp->wr_flow ? " WRFLOW" : "", |
1164 | tp->pcomp_en ? " PCOMP" : "", |
1165 | tp->hold_mcs ? " HMCS" : "", |
1166 | tmp, tp->offset); |
1167 | } else { |
1168 | dev_info(&starget->dev, "%sasynchronous\n", |
1169 | tp->width ? "wide " : ""); |
1170 | } |
1171 | } |
1172 | EXPORT_SYMBOL(spi_display_xfer_agreement); |
1173 | |
1174 | int spi_populate_width_msg(unsigned char *msg, int width) |
1175 | { |
1176 | msg[0] = EXTENDED_MESSAGE; |
1177 | msg[1] = 2; |
1178 | msg[2] = EXTENDED_WDTR; |
1179 | msg[3] = width; |
1180 | return 4; |
1181 | } |
1182 | EXPORT_SYMBOL_GPL(spi_populate_width_msg); |
1183 | |
1184 | int spi_populate_sync_msg(unsigned char *msg, int period, int offset) |
1185 | { |
1186 | msg[0] = EXTENDED_MESSAGE; |
1187 | msg[1] = 3; |
1188 | msg[2] = EXTENDED_SDTR; |
1189 | msg[3] = period; |
1190 | msg[4] = offset; |
1191 | return 5; |
1192 | } |
1193 | EXPORT_SYMBOL_GPL(spi_populate_sync_msg); |
1194 | |
1195 | int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, |
1196 | int width, int options) |
1197 | { |
1198 | msg[0] = EXTENDED_MESSAGE; |
1199 | msg[1] = 6; |
1200 | msg[2] = EXTENDED_PPR; |
1201 | msg[3] = period; |
1202 | msg[4] = 0; |
1203 | msg[5] = offset; |
1204 | msg[6] = width; |
1205 | msg[7] = options; |
1206 | return 8; |
1207 | } |
1208 | EXPORT_SYMBOL_GPL(spi_populate_ppr_msg); |
1209 | |
1210 | #ifdef CONFIG_SCSI_CONSTANTS |
1211 | static const char * const one_byte_msgs[] = { |
1212 | /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers", |
1213 | /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", |
1214 | /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error", |
1215 | /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag", |
1216 | /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", |
1217 | /* 0x0f */ "Initiate Recovery", "Release Recovery", |
1218 | /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable", |
1219 | /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset" |
1220 | }; |
1221 | |
1222 | static const char * const two_byte_msgs[] = { |
1223 | /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag", |
1224 | /* 0x23 */ "Ignore Wide Residue", "ACA" |
1225 | }; |
1226 | |
1227 | static const char * const extended_msgs[] = { |
1228 | /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request", |
1229 | /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request", |
1230 | /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer" |
1231 | }; |
1232 | |
1233 | static void print_nego(const unsigned char *msg, int per, int off, int width) |
1234 | { |
1235 | if (per) { |
1236 | char buf[20]; |
1237 | period_to_str(buf, msg[per]); |
1238 | printk("period = %s ns ", buf); |
1239 | } |
1240 | |
1241 | if (off) |
1242 | printk("offset = %d ", msg[off]); |
1243 | if (width) |
1244 | printk("width = %d ", 8 << msg[width]); |
1245 | } |
1246 | |
1247 | static void print_ptr(const unsigned char *msg, int msb, const char *desc) |
1248 | { |
1249 | int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) | |
1250 | msg[msb+3]; |
1251 | printk("%s = %d ", desc, ptr); |
1252 | } |
1253 | |
1254 | int spi_print_msg(const unsigned char *msg) |
1255 | { |
1256 | int len = 1, i; |
1257 | if (msg[0] == EXTENDED_MESSAGE) { |
1258 | len = 2 + msg[1]; |
1259 | if (len == 2) |
1260 | len += 256; |
1261 | if (msg[2] < ARRAY_SIZE(extended_msgs)) |
1262 | printk ("%s ", extended_msgs[msg[2]]); |
1263 | else |
1264 | printk ("Extended Message, reserved code (0x%02x) ", |
1265 | (int) msg[2]); |
1266 | switch (msg[2]) { |
1267 | case EXTENDED_MODIFY_DATA_POINTER: |
1268 | print_ptr(msg, 3, "pointer"); |
1269 | break; |
1270 | case EXTENDED_SDTR: |
1271 | print_nego(msg, 3, 4, 0); |
1272 | break; |
1273 | case EXTENDED_WDTR: |
1274 | print_nego(msg, 0, 0, 3); |
1275 | break; |
1276 | case EXTENDED_PPR: |
1277 | print_nego(msg, 3, 5, 6); |
1278 | break; |
1279 | case EXTENDED_MODIFY_BIDI_DATA_PTR: |
1280 | print_ptr(msg, 3, "out"); |
1281 | print_ptr(msg, 7, "in"); |
1282 | break; |
1283 | default: |
1284 | for (i = 2; i < len; ++i) |
1285 | printk("%02x ", msg[i]); |
1286 | } |
1287 | /* Identify */ |
1288 | } else if (msg[0] & 0x80) { |
1289 | printk("Identify disconnect %sallowed %s %d ", |
1290 | (msg[0] & 0x40) ? "" : "not ", |
1291 | (msg[0] & 0x20) ? "target routine" : "lun", |
1292 | msg[0] & 0x7); |
1293 | /* Normal One byte */ |
1294 | } else if (msg[0] < 0x1f) { |
1295 | if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]]) |
1296 | printk("%s ", one_byte_msgs[msg[0]]); |
1297 | else |
1298 | printk("reserved (%02x) ", msg[0]); |
1299 | } else if (msg[0] == 0x55) { |
1300 | printk("QAS Request "); |
1301 | /* Two byte */ |
1302 | } else if (msg[0] <= 0x2f) { |
1303 | if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs)) |
1304 | printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], |
1305 | msg[1]); |
1306 | else |
1307 | printk("reserved two byte (%02x %02x) ", |
1308 | msg[0], msg[1]); |
1309 | len = 2; |
1310 | } else |
1311 | printk("reserved "); |
1312 | return len; |
1313 | } |
1314 | EXPORT_SYMBOL(spi_print_msg); |
1315 | |
1316 | #else /* ifndef CONFIG_SCSI_CONSTANTS */ |
1317 | |
1318 | int spi_print_msg(const unsigned char *msg) |
1319 | { |
1320 | int len = 1, i; |
1321 | |
1322 | if (msg[0] == EXTENDED_MESSAGE) { |
1323 | len = 2 + msg[1]; |
1324 | if (len == 2) |
1325 | len += 256; |
1326 | for (i = 0; i < len; ++i) |
1327 | printk("%02x ", msg[i]); |
1328 | /* Identify */ |
1329 | } else if (msg[0] & 0x80) { |
1330 | printk("%02x ", msg[0]); |
1331 | /* Normal One byte */ |
1332 | } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) { |
1333 | printk("%02x ", msg[0]); |
1334 | /* Two byte */ |
1335 | } else if (msg[0] <= 0x2f) { |
1336 | printk("%02x %02x", msg[0], msg[1]); |
1337 | len = 2; |
1338 | } else |
1339 | printk("%02x ", msg[0]); |
1340 | return len; |
1341 | } |
1342 | EXPORT_SYMBOL(spi_print_msg); |
1343 | #endif /* ! CONFIG_SCSI_CONSTANTS */ |
1344 | |
1345 | static int spi_device_match(struct attribute_container *cont, |
1346 | struct device *dev) |
1347 | { |
1348 | struct scsi_device *sdev; |
1349 | struct Scsi_Host *shost; |
1350 | struct spi_internal *i; |
1351 | |
1352 | if (!scsi_is_sdev_device(dev)) |
1353 | return 0; |
1354 | |
1355 | sdev = to_scsi_device(dev); |
1356 | shost = sdev->host; |
1357 | if (!shost->transportt || shost->transportt->host_attrs.ac.class |
1358 | != &spi_host_class.class) |
1359 | return 0; |
1360 | /* Note: this class has no device attributes, so it has |
1361 | * no per-HBA allocation and thus we don't need to distinguish |
1362 | * the attribute containers for the device */ |
1363 | i = to_spi_internal(shost->transportt); |
1364 | if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) |
1365 | return 0; |
1366 | return 1; |
1367 | } |
1368 | |
1369 | static int spi_target_match(struct attribute_container *cont, |
1370 | struct device *dev) |
1371 | { |
1372 | struct Scsi_Host *shost; |
1373 | struct scsi_target *starget; |
1374 | struct spi_internal *i; |
1375 | |
1376 | if (!scsi_is_target_device(dev)) |
1377 | return 0; |
1378 | |
1379 | shost = dev_to_shost(dev->parent); |
1380 | if (!shost->transportt || shost->transportt->host_attrs.ac.class |
1381 | != &spi_host_class.class) |
1382 | return 0; |
1383 | |
1384 | i = to_spi_internal(shost->transportt); |
1385 | starget = to_scsi_target(dev); |
1386 | |
1387 | if (i->f->deny_binding && i->f->deny_binding(starget)) |
1388 | return 0; |
1389 | |
1390 | return &i->t.target_attrs.ac == cont; |
1391 | } |
1392 | |
1393 | static DECLARE_TRANSPORT_CLASS(spi_transport_class, |
1394 | "spi_transport", |
1395 | spi_setup_transport_attrs, |
1396 | NULL, |
1397 | spi_target_configure); |
1398 | |
1399 | static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, |
1400 | spi_device_match, |
1401 | spi_device_configure); |
1402 | |
1403 | static struct attribute *host_attributes[] = { |
1404 | &dev_attr_signalling.attr, |
1405 | &dev_attr_host_width.attr, |
1406 | &dev_attr_hba_id.attr, |
1407 | NULL |
1408 | }; |
1409 | |
1410 | static struct attribute_group host_attribute_group = { |
1411 | .attrs = host_attributes, |
1412 | }; |
1413 | |
1414 | static int spi_host_configure(struct transport_container *tc, |
1415 | struct device *dev, |
1416 | struct device *cdev) |
1417 | { |
1418 | struct kobject *kobj = &cdev->kobj; |
1419 | struct Scsi_Host *shost = transport_class_to_shost(cdev); |
1420 | struct spi_internal *si = to_spi_internal(shost->transportt); |
1421 | struct attribute *attr = &dev_attr_signalling.attr; |
1422 | int rc = 0; |
1423 | |
1424 | if (si->f->set_signalling) |
1425 | rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); |
1426 | |
1427 | return rc; |
1428 | } |
1429 | |
1430 | /* returns true if we should be showing the variable. Also |
1431 | * overloads the return by setting 1<<1 if the attribute should |
1432 | * be writeable */ |
1433 | #define TARGET_ATTRIBUTE_HELPER(name) \ |
1434 | (si->f->show_##name ? S_IRUGO : 0) | \ |
1435 | (si->f->set_##name ? S_IWUSR : 0) |
1436 | |
1437 | static umode_t target_attribute_is_visible(struct kobject *kobj, |
1438 | struct attribute *attr, int i) |
1439 | { |
1440 | struct device *cdev = container_of(kobj, struct device, kobj); |
1441 | struct scsi_target *starget = transport_class_to_starget(cdev); |
1442 | struct Scsi_Host *shost = transport_class_to_shost(cdev); |
1443 | struct spi_internal *si = to_spi_internal(shost->transportt); |
1444 | |
1445 | if (attr == &dev_attr_period.attr && |
1446 | spi_support_sync(starget)) |
1447 | return TARGET_ATTRIBUTE_HELPER(period); |
1448 | else if (attr == &dev_attr_min_period.attr && |
1449 | spi_support_sync(starget)) |
1450 | return TARGET_ATTRIBUTE_HELPER(period); |
1451 | else if (attr == &dev_attr_offset.attr && |
1452 | spi_support_sync(starget)) |
1453 | return TARGET_ATTRIBUTE_HELPER(offset); |
1454 | else if (attr == &dev_attr_max_offset.attr && |
1455 | spi_support_sync(starget)) |
1456 | return TARGET_ATTRIBUTE_HELPER(offset); |
1457 | else if (attr == &dev_attr_width.attr && |
1458 | spi_support_wide(starget)) |
1459 | return TARGET_ATTRIBUTE_HELPER(width); |
1460 | else if (attr == &dev_attr_max_width.attr && |
1461 | spi_support_wide(starget)) |
1462 | return TARGET_ATTRIBUTE_HELPER(width); |
1463 | else if (attr == &dev_attr_iu.attr && |
1464 | spi_support_ius(starget)) |
1465 | return TARGET_ATTRIBUTE_HELPER(iu); |
1466 | else if (attr == &dev_attr_max_iu.attr && |
1467 | spi_support_ius(starget)) |
1468 | return TARGET_ATTRIBUTE_HELPER(iu); |
1469 | else if (attr == &dev_attr_dt.attr && |
1470 | spi_support_dt(starget)) |
1471 | return TARGET_ATTRIBUTE_HELPER(dt); |
1472 | else if (attr == &dev_attr_qas.attr && |
1473 | spi_support_qas(starget)) |
1474 | return TARGET_ATTRIBUTE_HELPER(qas); |
1475 | else if (attr == &dev_attr_max_qas.attr && |
1476 | spi_support_qas(starget)) |
1477 | return TARGET_ATTRIBUTE_HELPER(qas); |
1478 | else if (attr == &dev_attr_wr_flow.attr && |
1479 | spi_support_ius(starget)) |
1480 | return TARGET_ATTRIBUTE_HELPER(wr_flow); |
1481 | else if (attr == &dev_attr_rd_strm.attr && |
1482 | spi_support_ius(starget)) |
1483 | return TARGET_ATTRIBUTE_HELPER(rd_strm); |
1484 | else if (attr == &dev_attr_rti.attr && |
1485 | spi_support_ius(starget)) |
1486 | return TARGET_ATTRIBUTE_HELPER(rti); |
1487 | else if (attr == &dev_attr_pcomp_en.attr && |
1488 | spi_support_ius(starget)) |
1489 | return TARGET_ATTRIBUTE_HELPER(pcomp_en); |
1490 | else if (attr == &dev_attr_hold_mcs.attr && |
1491 | spi_support_ius(starget)) |
1492 | return TARGET_ATTRIBUTE_HELPER(hold_mcs); |
1493 | else if (attr == &dev_attr_revalidate.attr) |
1494 | return S_IWUSR; |
1495 | |
1496 | return 0; |
1497 | } |
1498 | |
1499 | static struct attribute *target_attributes[] = { |
1500 | &dev_attr_period.attr, |
1501 | &dev_attr_min_period.attr, |
1502 | &dev_attr_offset.attr, |
1503 | &dev_attr_max_offset.attr, |
1504 | &dev_attr_width.attr, |
1505 | &dev_attr_max_width.attr, |
1506 | &dev_attr_iu.attr, |
1507 | &dev_attr_max_iu.attr, |
1508 | &dev_attr_dt.attr, |
1509 | &dev_attr_qas.attr, |
1510 | &dev_attr_max_qas.attr, |
1511 | &dev_attr_wr_flow.attr, |
1512 | &dev_attr_rd_strm.attr, |
1513 | &dev_attr_rti.attr, |
1514 | &dev_attr_pcomp_en.attr, |
1515 | &dev_attr_hold_mcs.attr, |
1516 | &dev_attr_revalidate.attr, |
1517 | NULL |
1518 | }; |
1519 | |
1520 | static struct attribute_group target_attribute_group = { |
1521 | .attrs = target_attributes, |
1522 | .is_visible = target_attribute_is_visible, |
1523 | }; |
1524 | |
1525 | static int spi_target_configure(struct transport_container *tc, |
1526 | struct device *dev, |
1527 | struct device *cdev) |
1528 | { |
1529 | struct kobject *kobj = &cdev->kobj; |
1530 | |
1531 | /* force an update based on parameters read from the device */ |
1532 | sysfs_update_group(kobj, &target_attribute_group); |
1533 | |
1534 | return 0; |
1535 | } |
1536 | |
1537 | struct scsi_transport_template * |
1538 | spi_attach_transport(struct spi_function_template *ft) |
1539 | { |
1540 | struct spi_internal *i = kzalloc(sizeof(struct spi_internal), |
1541 | GFP_KERNEL); |
1542 | |
1543 | if (unlikely(!i)) |
1544 | return NULL; |
1545 | |
1546 | i->t.target_attrs.ac.class = &spi_transport_class.class; |
1547 | i->t.target_attrs.ac.grp = &target_attribute_group; |
1548 | i->t.target_attrs.ac.match = spi_target_match; |
1549 | transport_container_register(&i->t.target_attrs); |
1550 | i->t.target_size = sizeof(struct spi_transport_attrs); |
1551 | i->t.host_attrs.ac.class = &spi_host_class.class; |
1552 | i->t.host_attrs.ac.grp = &host_attribute_group; |
1553 | i->t.host_attrs.ac.match = spi_host_match; |
1554 | transport_container_register(&i->t.host_attrs); |
1555 | i->t.host_size = sizeof(struct spi_host_attrs); |
1556 | i->f = ft; |
1557 | |
1558 | return &i->t; |
1559 | } |
1560 | EXPORT_SYMBOL(spi_attach_transport); |
1561 | |
1562 | void spi_release_transport(struct scsi_transport_template *t) |
1563 | { |
1564 | struct spi_internal *i = to_spi_internal(t); |
1565 | |
1566 | transport_container_unregister(&i->t.target_attrs); |
1567 | transport_container_unregister(&i->t.host_attrs); |
1568 | |
1569 | kfree(i); |
1570 | } |
1571 | EXPORT_SYMBOL(spi_release_transport); |
1572 | |
1573 | static __init int spi_transport_init(void) |
1574 | { |
1575 | int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI, |
1576 | "SCSI Parallel Transport Class"); |
1577 | if (!error) { |
1578 | int i; |
1579 | |
1580 | for (i = 0; spi_static_device_list[i].vendor; i++) |
1581 | scsi_dev_info_list_add_keyed(1, /* compatible */ |
1582 | spi_static_device_list[i].vendor, |
1583 | spi_static_device_list[i].model, |
1584 | NULL, |
1585 | spi_static_device_list[i].flags, |
1586 | SCSI_DEVINFO_SPI); |
1587 | } |
1588 | |
1589 | error = transport_class_register(&spi_transport_class); |
1590 | if (error) |
1591 | return error; |
1592 | error = anon_transport_class_register(&spi_device_class); |
1593 | return transport_class_register(&spi_host_class); |
1594 | } |
1595 | |
1596 | static void __exit spi_transport_exit(void) |
1597 | { |
1598 | transport_class_unregister(&spi_transport_class); |
1599 | anon_transport_class_unregister(&spi_device_class); |
1600 | transport_class_unregister(&spi_host_class); |
1601 | scsi_dev_info_remove_list(SCSI_DEVINFO_SPI); |
1602 | } |
1603 | |
1604 | MODULE_AUTHOR("Martin Hicks"); |
1605 | MODULE_DESCRIPTION("SPI Transport Attributes"); |
1606 | MODULE_LICENSE("GPL"); |
1607 | |
1608 | module_init(spi_transport_init); |
1609 | module_exit(spi_transport_exit); |
1610 |
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