1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Device probing and sysfs code. |
4 | * |
5 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> |
6 | */ |
7 | |
8 | #include <linux/bug.h> |
9 | #include <linux/ctype.h> |
10 | #include <linux/delay.h> |
11 | #include <linux/device.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/firewire.h> |
14 | #include <linux/firewire-constants.h> |
15 | #include <linux/idr.h> |
16 | #include <linux/jiffies.h> |
17 | #include <linux/kobject.h> |
18 | #include <linux/list.h> |
19 | #include <linux/mod_devicetable.h> |
20 | #include <linux/module.h> |
21 | #include <linux/mutex.h> |
22 | #include <linux/random.h> |
23 | #include <linux/rwsem.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/spinlock.h> |
26 | #include <linux/string.h> |
27 | #include <linux/workqueue.h> |
28 | |
29 | #include <linux/atomic.h> |
30 | #include <asm/byteorder.h> |
31 | |
32 | #include "core.h" |
33 | |
34 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) |
35 | { |
36 | ci->p = p + 1; |
37 | ci->end = ci->p + (p[0] >> 16); |
38 | } |
39 | EXPORT_SYMBOL(fw_csr_iterator_init); |
40 | |
41 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) |
42 | { |
43 | *key = *ci->p >> 24; |
44 | *value = *ci->p & 0xffffff; |
45 | |
46 | return ci->p++ < ci->end; |
47 | } |
48 | EXPORT_SYMBOL(fw_csr_iterator_next); |
49 | |
50 | static const u32 *search_leaf(const u32 *directory, int search_key) |
51 | { |
52 | struct fw_csr_iterator ci; |
53 | int last_key = 0, key, value; |
54 | |
55 | fw_csr_iterator_init(&ci, directory); |
56 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
57 | if (last_key == search_key && |
58 | key == (CSR_DESCRIPTOR | CSR_LEAF)) |
59 | return ci.p - 1 + value; |
60 | |
61 | last_key = key; |
62 | } |
63 | |
64 | return NULL; |
65 | } |
66 | |
67 | static int textual_leaf_to_string(const u32 *block, char *buf, size_t size) |
68 | { |
69 | unsigned int quadlets, i; |
70 | char c; |
71 | |
72 | if (!size || !buf) |
73 | return -EINVAL; |
74 | |
75 | quadlets = min(block[0] >> 16, 256U); |
76 | if (quadlets < 2) |
77 | return -ENODATA; |
78 | |
79 | if (block[1] != 0 || block[2] != 0) |
80 | /* unknown language/character set */ |
81 | return -ENODATA; |
82 | |
83 | block += 3; |
84 | quadlets -= 2; |
85 | for (i = 0; i < quadlets * 4 && i < size - 1; i++) { |
86 | c = block[i / 4] >> (24 - 8 * (i % 4)); |
87 | if (c == '\0') |
88 | break; |
89 | buf[i] = c; |
90 | } |
91 | buf[i] = '\0'; |
92 | |
93 | return i; |
94 | } |
95 | |
96 | /** |
97 | * fw_csr_string() - reads a string from the configuration ROM |
98 | * @directory: e.g. root directory or unit directory |
99 | * @key: the key of the preceding directory entry |
100 | * @buf: where to put the string |
101 | * @size: size of @buf, in bytes |
102 | * |
103 | * The string is taken from a minimal ASCII text descriptor leaf after |
104 | * the immediate entry with @key. The string is zero-terminated. |
105 | * An overlong string is silently truncated such that it and the |
106 | * zero byte fit into @size. |
107 | * |
108 | * Returns strlen(buf) or a negative error code. |
109 | */ |
110 | int fw_csr_string(const u32 *directory, int key, char *buf, size_t size) |
111 | { |
112 | const u32 *leaf = search_leaf(directory, search_key: key); |
113 | if (!leaf) |
114 | return -ENOENT; |
115 | |
116 | return textual_leaf_to_string(block: leaf, buf, size); |
117 | } |
118 | EXPORT_SYMBOL(fw_csr_string); |
119 | |
120 | static void get_ids(const u32 *directory, int *id) |
121 | { |
122 | struct fw_csr_iterator ci; |
123 | int key, value; |
124 | |
125 | fw_csr_iterator_init(&ci, directory); |
126 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
127 | switch (key) { |
128 | case CSR_VENDOR: id[0] = value; break; |
129 | case CSR_MODEL: id[1] = value; break; |
130 | case CSR_SPECIFIER_ID: id[2] = value; break; |
131 | case CSR_VERSION: id[3] = value; break; |
132 | } |
133 | } |
134 | } |
135 | |
136 | static void get_modalias_ids(const struct fw_unit *unit, int *id) |
137 | { |
138 | get_ids(directory: &fw_parent_device(unit)->config_rom[5], id); |
139 | get_ids(directory: unit->directory, id); |
140 | } |
141 | |
142 | static bool match_ids(const struct ieee1394_device_id *id_table, int *id) |
143 | { |
144 | int match = 0; |
145 | |
146 | if (id[0] == id_table->vendor_id) |
147 | match |= IEEE1394_MATCH_VENDOR_ID; |
148 | if (id[1] == id_table->model_id) |
149 | match |= IEEE1394_MATCH_MODEL_ID; |
150 | if (id[2] == id_table->specifier_id) |
151 | match |= IEEE1394_MATCH_SPECIFIER_ID; |
152 | if (id[3] == id_table->version) |
153 | match |= IEEE1394_MATCH_VERSION; |
154 | |
155 | return (match & id_table->match_flags) == id_table->match_flags; |
156 | } |
157 | |
158 | static const struct ieee1394_device_id *unit_match(struct device *dev, |
159 | struct device_driver *drv) |
160 | { |
161 | const struct ieee1394_device_id *id_table = |
162 | container_of(drv, struct fw_driver, driver)->id_table; |
163 | int id[] = {0, 0, 0, 0}; |
164 | |
165 | get_modalias_ids(fw_unit(dev), id); |
166 | |
167 | for (; id_table->match_flags != 0; id_table++) |
168 | if (match_ids(id_table, id)) |
169 | return id_table; |
170 | |
171 | return NULL; |
172 | } |
173 | |
174 | static bool is_fw_unit(struct device *dev); |
175 | |
176 | static int fw_unit_match(struct device *dev, struct device_driver *drv) |
177 | { |
178 | /* We only allow binding to fw_units. */ |
179 | return is_fw_unit(dev) && unit_match(dev, drv) != NULL; |
180 | } |
181 | |
182 | static int fw_unit_probe(struct device *dev) |
183 | { |
184 | struct fw_driver *driver = |
185 | container_of(dev->driver, struct fw_driver, driver); |
186 | |
187 | return driver->probe(fw_unit(dev), unit_match(dev, drv: dev->driver)); |
188 | } |
189 | |
190 | static void fw_unit_remove(struct device *dev) |
191 | { |
192 | struct fw_driver *driver = |
193 | container_of(dev->driver, struct fw_driver, driver); |
194 | |
195 | driver->remove(fw_unit(dev)); |
196 | } |
197 | |
198 | static int get_modalias(const struct fw_unit *unit, char *buffer, size_t buffer_size) |
199 | { |
200 | int id[] = {0, 0, 0, 0}; |
201 | |
202 | get_modalias_ids(unit, id); |
203 | |
204 | return snprintf(buf: buffer, size: buffer_size, |
205 | fmt: "ieee1394:ven%08Xmo%08Xsp%08Xver%08X" , |
206 | id[0], id[1], id[2], id[3]); |
207 | } |
208 | |
209 | static int fw_unit_uevent(const struct device *dev, struct kobj_uevent_env *env) |
210 | { |
211 | const struct fw_unit *unit = fw_unit(dev); |
212 | char modalias[64]; |
213 | |
214 | get_modalias(unit, buffer: modalias, buffer_size: sizeof(modalias)); |
215 | |
216 | if (add_uevent_var(env, format: "MODALIAS=%s" , modalias)) |
217 | return -ENOMEM; |
218 | |
219 | return 0; |
220 | } |
221 | |
222 | struct bus_type fw_bus_type = { |
223 | .name = "firewire" , |
224 | .match = fw_unit_match, |
225 | .probe = fw_unit_probe, |
226 | .remove = fw_unit_remove, |
227 | }; |
228 | EXPORT_SYMBOL(fw_bus_type); |
229 | |
230 | int fw_device_enable_phys_dma(struct fw_device *device) |
231 | { |
232 | int generation = device->generation; |
233 | |
234 | /* device->node_id, accessed below, must not be older than generation */ |
235 | smp_rmb(); |
236 | |
237 | return device->card->driver->enable_phys_dma(device->card, |
238 | device->node_id, |
239 | generation); |
240 | } |
241 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
242 | |
243 | struct config_rom_attribute { |
244 | struct device_attribute attr; |
245 | u32 key; |
246 | }; |
247 | |
248 | static ssize_t show_immediate(struct device *dev, |
249 | struct device_attribute *dattr, char *buf) |
250 | { |
251 | struct config_rom_attribute *attr = |
252 | container_of(dattr, struct config_rom_attribute, attr); |
253 | struct fw_csr_iterator ci; |
254 | const u32 *dir; |
255 | int key, value, ret = -ENOENT; |
256 | |
257 | down_read(sem: &fw_device_rwsem); |
258 | |
259 | if (is_fw_unit(dev)) |
260 | dir = fw_unit(dev)->directory; |
261 | else |
262 | dir = fw_device(dev)->config_rom + 5; |
263 | |
264 | fw_csr_iterator_init(&ci, dir); |
265 | while (fw_csr_iterator_next(&ci, &key, &value)) |
266 | if (attr->key == key) { |
267 | ret = snprintf(buf, size: buf ? PAGE_SIZE : 0, |
268 | fmt: "0x%06x\n" , value); |
269 | break; |
270 | } |
271 | |
272 | up_read(sem: &fw_device_rwsem); |
273 | |
274 | return ret; |
275 | } |
276 | |
277 | #define IMMEDIATE_ATTR(name, key) \ |
278 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } |
279 | |
280 | static ssize_t show_text_leaf(struct device *dev, |
281 | struct device_attribute *dattr, char *buf) |
282 | { |
283 | struct config_rom_attribute *attr = |
284 | container_of(dattr, struct config_rom_attribute, attr); |
285 | const u32 *dir; |
286 | size_t bufsize; |
287 | char dummy_buf[2]; |
288 | int ret; |
289 | |
290 | down_read(sem: &fw_device_rwsem); |
291 | |
292 | if (is_fw_unit(dev)) |
293 | dir = fw_unit(dev)->directory; |
294 | else |
295 | dir = fw_device(dev)->config_rom + 5; |
296 | |
297 | if (buf) { |
298 | bufsize = PAGE_SIZE - 1; |
299 | } else { |
300 | buf = dummy_buf; |
301 | bufsize = 1; |
302 | } |
303 | |
304 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
305 | |
306 | if (ret >= 0) { |
307 | /* Strip trailing whitespace and add newline. */ |
308 | while (ret > 0 && isspace(buf[ret - 1])) |
309 | ret--; |
310 | strcpy(p: buf + ret, q: "\n" ); |
311 | ret++; |
312 | } |
313 | |
314 | up_read(sem: &fw_device_rwsem); |
315 | |
316 | return ret; |
317 | } |
318 | |
319 | #define TEXT_LEAF_ATTR(name, key) \ |
320 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } |
321 | |
322 | static struct config_rom_attribute config_rom_attributes[] = { |
323 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), |
324 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), |
325 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), |
326 | IMMEDIATE_ATTR(version, CSR_VERSION), |
327 | IMMEDIATE_ATTR(model, CSR_MODEL), |
328 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), |
329 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), |
330 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), |
331 | }; |
332 | |
333 | static void init_fw_attribute_group(struct device *dev, |
334 | struct device_attribute *attrs, |
335 | struct fw_attribute_group *group) |
336 | { |
337 | struct device_attribute *attr; |
338 | int i, j; |
339 | |
340 | for (j = 0; attrs[j].attr.name != NULL; j++) |
341 | group->attrs[j] = &attrs[j].attr; |
342 | |
343 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { |
344 | attr = &config_rom_attributes[i].attr; |
345 | if (attr->show(dev, attr, NULL) < 0) |
346 | continue; |
347 | group->attrs[j++] = &attr->attr; |
348 | } |
349 | |
350 | group->attrs[j] = NULL; |
351 | group->groups[0] = &group->group; |
352 | group->groups[1] = NULL; |
353 | group->group.attrs = group->attrs; |
354 | dev->groups = (const struct attribute_group **) group->groups; |
355 | } |
356 | |
357 | static ssize_t modalias_show(struct device *dev, |
358 | struct device_attribute *attr, char *buf) |
359 | { |
360 | struct fw_unit *unit = fw_unit(dev); |
361 | int length; |
362 | |
363 | length = get_modalias(unit, buffer: buf, PAGE_SIZE); |
364 | strcpy(p: buf + length, q: "\n" ); |
365 | |
366 | return length + 1; |
367 | } |
368 | |
369 | static ssize_t rom_index_show(struct device *dev, |
370 | struct device_attribute *attr, char *buf) |
371 | { |
372 | struct fw_device *device = fw_device(dev->parent); |
373 | struct fw_unit *unit = fw_unit(dev); |
374 | |
375 | return sysfs_emit(buf, fmt: "%td\n" , unit->directory - device->config_rom); |
376 | } |
377 | |
378 | static struct device_attribute fw_unit_attributes[] = { |
379 | __ATTR_RO(modalias), |
380 | __ATTR_RO(rom_index), |
381 | __ATTR_NULL, |
382 | }; |
383 | |
384 | static ssize_t config_rom_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) |
386 | { |
387 | struct fw_device *device = fw_device(dev); |
388 | size_t length; |
389 | |
390 | down_read(sem: &fw_device_rwsem); |
391 | length = device->config_rom_length * 4; |
392 | memcpy(buf, device->config_rom, length); |
393 | up_read(sem: &fw_device_rwsem); |
394 | |
395 | return length; |
396 | } |
397 | |
398 | static ssize_t guid_show(struct device *dev, |
399 | struct device_attribute *attr, char *buf) |
400 | { |
401 | struct fw_device *device = fw_device(dev); |
402 | int ret; |
403 | |
404 | down_read(sem: &fw_device_rwsem); |
405 | ret = sysfs_emit(buf, fmt: "0x%08x%08x\n" , device->config_rom[3], device->config_rom[4]); |
406 | up_read(sem: &fw_device_rwsem); |
407 | |
408 | return ret; |
409 | } |
410 | |
411 | static ssize_t is_local_show(struct device *dev, |
412 | struct device_attribute *attr, char *buf) |
413 | { |
414 | struct fw_device *device = fw_device(dev); |
415 | |
416 | return sprintf(buf, fmt: "%u\n" , device->is_local); |
417 | } |
418 | |
419 | static int units_sprintf(char *buf, const u32 *directory) |
420 | { |
421 | struct fw_csr_iterator ci; |
422 | int key, value; |
423 | int specifier_id = 0; |
424 | int version = 0; |
425 | |
426 | fw_csr_iterator_init(&ci, directory); |
427 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
428 | switch (key) { |
429 | case CSR_SPECIFIER_ID: |
430 | specifier_id = value; |
431 | break; |
432 | case CSR_VERSION: |
433 | version = value; |
434 | break; |
435 | } |
436 | } |
437 | |
438 | return sprintf(buf, fmt: "0x%06x:0x%06x " , specifier_id, version); |
439 | } |
440 | |
441 | static ssize_t units_show(struct device *dev, |
442 | struct device_attribute *attr, char *buf) |
443 | { |
444 | struct fw_device *device = fw_device(dev); |
445 | struct fw_csr_iterator ci; |
446 | int key, value, i = 0; |
447 | |
448 | down_read(sem: &fw_device_rwsem); |
449 | fw_csr_iterator_init(&ci, &device->config_rom[5]); |
450 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
451 | if (key != (CSR_UNIT | CSR_DIRECTORY)) |
452 | continue; |
453 | i += units_sprintf(buf: &buf[i], directory: ci.p + value - 1); |
454 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) |
455 | break; |
456 | } |
457 | up_read(sem: &fw_device_rwsem); |
458 | |
459 | if (i) |
460 | buf[i - 1] = '\n'; |
461 | |
462 | return i; |
463 | } |
464 | |
465 | static struct device_attribute fw_device_attributes[] = { |
466 | __ATTR_RO(config_rom), |
467 | __ATTR_RO(guid), |
468 | __ATTR_RO(is_local), |
469 | __ATTR_RO(units), |
470 | __ATTR_NULL, |
471 | }; |
472 | |
473 | static int read_rom(struct fw_device *device, |
474 | int generation, int index, u32 *data) |
475 | { |
476 | u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4; |
477 | int i, rcode; |
478 | |
479 | /* device->node_id, accessed below, must not be older than generation */ |
480 | smp_rmb(); |
481 | |
482 | for (i = 10; i < 100; i += 10) { |
483 | rcode = fw_run_transaction(card: device->card, |
484 | TCODE_READ_QUADLET_REQUEST, destination_id: device->node_id, |
485 | generation, speed: device->max_speed, offset, payload: data, length: 4); |
486 | if (rcode != RCODE_BUSY) |
487 | break; |
488 | msleep(msecs: i); |
489 | } |
490 | be32_to_cpus(data); |
491 | |
492 | return rcode; |
493 | } |
494 | |
495 | #define MAX_CONFIG_ROM_SIZE 256 |
496 | |
497 | /* |
498 | * Read the bus info block, perform a speed probe, and read all of the rest of |
499 | * the config ROM. We do all this with a cached bus generation. If the bus |
500 | * generation changes under us, read_config_rom will fail and get retried. |
501 | * It's better to start all over in this case because the node from which we |
502 | * are reading the ROM may have changed the ROM during the reset. |
503 | * Returns either a result code or a negative error code. |
504 | */ |
505 | static int read_config_rom(struct fw_device *device, int generation) |
506 | { |
507 | struct fw_card *card = device->card; |
508 | const u32 *old_rom, *new_rom; |
509 | u32 *rom, *stack; |
510 | u32 sp, key; |
511 | int i, end, length, ret; |
512 | |
513 | rom = kmalloc(size: sizeof(*rom) * MAX_CONFIG_ROM_SIZE + |
514 | sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL); |
515 | if (rom == NULL) |
516 | return -ENOMEM; |
517 | |
518 | stack = &rom[MAX_CONFIG_ROM_SIZE]; |
519 | memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE); |
520 | |
521 | device->max_speed = SCODE_100; |
522 | |
523 | /* First read the bus info block. */ |
524 | for (i = 0; i < 5; i++) { |
525 | ret = read_rom(device, generation, index: i, data: &rom[i]); |
526 | if (ret != RCODE_COMPLETE) |
527 | goto out; |
528 | /* |
529 | * As per IEEE1212 7.2, during initialization, devices can |
530 | * reply with a 0 for the first quadlet of the config |
531 | * rom to indicate that they are booting (for example, |
532 | * if the firmware is on the disk of a external |
533 | * harddisk). In that case we just fail, and the |
534 | * retry mechanism will try again later. |
535 | */ |
536 | if (i == 0 && rom[i] == 0) { |
537 | ret = RCODE_BUSY; |
538 | goto out; |
539 | } |
540 | } |
541 | |
542 | device->max_speed = device->node->max_speed; |
543 | |
544 | /* |
545 | * Determine the speed of |
546 | * - devices with link speed less than PHY speed, |
547 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), |
548 | * - all devices if there are 1394b repeaters. |
549 | * Note, we cannot use the bus info block's link_spd as starting point |
550 | * because some buggy firmwares set it lower than necessary and because |
551 | * 1394-1995 nodes do not have the field. |
552 | */ |
553 | if ((rom[2] & 0x7) < device->max_speed || |
554 | device->max_speed == SCODE_BETA || |
555 | card->beta_repeaters_present) { |
556 | u32 dummy; |
557 | |
558 | /* for S1600 and S3200 */ |
559 | if (device->max_speed == SCODE_BETA) |
560 | device->max_speed = card->link_speed; |
561 | |
562 | while (device->max_speed > SCODE_100) { |
563 | if (read_rom(device, generation, index: 0, data: &dummy) == |
564 | RCODE_COMPLETE) |
565 | break; |
566 | device->max_speed--; |
567 | } |
568 | } |
569 | |
570 | /* |
571 | * Now parse the config rom. The config rom is a recursive |
572 | * directory structure so we parse it using a stack of |
573 | * references to the blocks that make up the structure. We |
574 | * push a reference to the root directory on the stack to |
575 | * start things off. |
576 | */ |
577 | length = i; |
578 | sp = 0; |
579 | stack[sp++] = 0xc0000005; |
580 | while (sp > 0) { |
581 | /* |
582 | * Pop the next block reference of the stack. The |
583 | * lower 24 bits is the offset into the config rom, |
584 | * the upper 8 bits are the type of the reference the |
585 | * block. |
586 | */ |
587 | key = stack[--sp]; |
588 | i = key & 0xffffff; |
589 | if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) { |
590 | ret = -ENXIO; |
591 | goto out; |
592 | } |
593 | |
594 | /* Read header quadlet for the block to get the length. */ |
595 | ret = read_rom(device, generation, index: i, data: &rom[i]); |
596 | if (ret != RCODE_COMPLETE) |
597 | goto out; |
598 | end = i + (rom[i] >> 16) + 1; |
599 | if (end > MAX_CONFIG_ROM_SIZE) { |
600 | /* |
601 | * This block extends outside the config ROM which is |
602 | * a firmware bug. Ignore this whole block, i.e. |
603 | * simply set a fake block length of 0. |
604 | */ |
605 | fw_err(card, fmt: "skipped invalid ROM block %x at %llx\n" , |
606 | rom[i], |
607 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); |
608 | rom[i] = 0; |
609 | end = i; |
610 | } |
611 | i++; |
612 | |
613 | /* |
614 | * Now read in the block. If this is a directory |
615 | * block, check the entries as we read them to see if |
616 | * it references another block, and push it in that case. |
617 | */ |
618 | for (; i < end; i++) { |
619 | ret = read_rom(device, generation, index: i, data: &rom[i]); |
620 | if (ret != RCODE_COMPLETE) |
621 | goto out; |
622 | |
623 | if ((key >> 30) != 3 || (rom[i] >> 30) < 2) |
624 | continue; |
625 | /* |
626 | * Offset points outside the ROM. May be a firmware |
627 | * bug or an Extended ROM entry (IEEE 1212-2001 clause |
628 | * 7.7.18). Simply overwrite this pointer here by a |
629 | * fake immediate entry so that later iterators over |
630 | * the ROM don't have to check offsets all the time. |
631 | */ |
632 | if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) { |
633 | fw_err(card, |
634 | fmt: "skipped unsupported ROM entry %x at %llx\n" , |
635 | rom[i], |
636 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); |
637 | rom[i] = 0; |
638 | continue; |
639 | } |
640 | stack[sp++] = i + rom[i]; |
641 | } |
642 | if (length < i) |
643 | length = i; |
644 | } |
645 | |
646 | old_rom = device->config_rom; |
647 | new_rom = kmemdup(p: rom, size: length * 4, GFP_KERNEL); |
648 | if (new_rom == NULL) { |
649 | ret = -ENOMEM; |
650 | goto out; |
651 | } |
652 | |
653 | down_write(sem: &fw_device_rwsem); |
654 | device->config_rom = new_rom; |
655 | device->config_rom_length = length; |
656 | up_write(sem: &fw_device_rwsem); |
657 | |
658 | kfree(objp: old_rom); |
659 | ret = RCODE_COMPLETE; |
660 | device->max_rec = rom[2] >> 12 & 0xf; |
661 | device->cmc = rom[2] >> 30 & 1; |
662 | device->irmc = rom[2] >> 31 & 1; |
663 | out: |
664 | kfree(objp: rom); |
665 | |
666 | return ret; |
667 | } |
668 | |
669 | static void fw_unit_release(struct device *dev) |
670 | { |
671 | struct fw_unit *unit = fw_unit(dev); |
672 | |
673 | fw_device_put(fw_parent_device(unit)); |
674 | kfree(objp: unit); |
675 | } |
676 | |
677 | static struct device_type fw_unit_type = { |
678 | .uevent = fw_unit_uevent, |
679 | .release = fw_unit_release, |
680 | }; |
681 | |
682 | static bool is_fw_unit(struct device *dev) |
683 | { |
684 | return dev->type == &fw_unit_type; |
685 | } |
686 | |
687 | static void create_units(struct fw_device *device) |
688 | { |
689 | struct fw_csr_iterator ci; |
690 | struct fw_unit *unit; |
691 | int key, value, i; |
692 | |
693 | i = 0; |
694 | fw_csr_iterator_init(&ci, &device->config_rom[5]); |
695 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
696 | if (key != (CSR_UNIT | CSR_DIRECTORY)) |
697 | continue; |
698 | |
699 | /* |
700 | * Get the address of the unit directory and try to |
701 | * match the drivers id_tables against it. |
702 | */ |
703 | unit = kzalloc(size: sizeof(*unit), GFP_KERNEL); |
704 | if (unit == NULL) |
705 | continue; |
706 | |
707 | unit->directory = ci.p + value - 1; |
708 | unit->device.bus = &fw_bus_type; |
709 | unit->device.type = &fw_unit_type; |
710 | unit->device.parent = &device->device; |
711 | dev_set_name(dev: &unit->device, name: "%s.%d" , dev_name(dev: &device->device), i++); |
712 | |
713 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
714 | ARRAY_SIZE(fw_unit_attributes) + |
715 | ARRAY_SIZE(config_rom_attributes)); |
716 | init_fw_attribute_group(dev: &unit->device, |
717 | attrs: fw_unit_attributes, |
718 | group: &unit->attribute_group); |
719 | |
720 | if (device_register(dev: &unit->device) < 0) |
721 | goto skip_unit; |
722 | |
723 | fw_device_get(device); |
724 | continue; |
725 | |
726 | skip_unit: |
727 | kfree(objp: unit); |
728 | } |
729 | } |
730 | |
731 | static int shutdown_unit(struct device *device, void *data) |
732 | { |
733 | device_unregister(dev: device); |
734 | |
735 | return 0; |
736 | } |
737 | |
738 | /* |
739 | * fw_device_rwsem acts as dual purpose mutex: |
740 | * - serializes accesses to fw_device_idr, |
741 | * - serializes accesses to fw_device.config_rom/.config_rom_length and |
742 | * fw_unit.directory, unless those accesses happen at safe occasions |
743 | */ |
744 | DECLARE_RWSEM(fw_device_rwsem); |
745 | |
746 | DEFINE_IDR(fw_device_idr); |
747 | int fw_cdev_major; |
748 | |
749 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
750 | { |
751 | struct fw_device *device; |
752 | |
753 | down_read(sem: &fw_device_rwsem); |
754 | device = idr_find(&fw_device_idr, MINOR(devt)); |
755 | if (device) |
756 | fw_device_get(device); |
757 | up_read(sem: &fw_device_rwsem); |
758 | |
759 | return device; |
760 | } |
761 | |
762 | struct workqueue_struct *fw_workqueue; |
763 | EXPORT_SYMBOL(fw_workqueue); |
764 | |
765 | static void fw_schedule_device_work(struct fw_device *device, |
766 | unsigned long delay) |
767 | { |
768 | queue_delayed_work(wq: fw_workqueue, dwork: &device->work, delay); |
769 | } |
770 | |
771 | /* |
772 | * These defines control the retry behavior for reading the config |
773 | * rom. It shouldn't be necessary to tweak these; if the device |
774 | * doesn't respond to a config rom read within 10 seconds, it's not |
775 | * going to respond at all. As for the initial delay, a lot of |
776 | * devices will be able to respond within half a second after bus |
777 | * reset. On the other hand, it's not really worth being more |
778 | * aggressive than that, since it scales pretty well; if 10 devices |
779 | * are plugged in, they're all getting read within one second. |
780 | */ |
781 | |
782 | #define MAX_RETRIES 10 |
783 | #define RETRY_DELAY (3 * HZ) |
784 | #define INITIAL_DELAY (HZ / 2) |
785 | #define SHUTDOWN_DELAY (2 * HZ) |
786 | |
787 | static void fw_device_shutdown(struct work_struct *work) |
788 | { |
789 | struct fw_device *device = |
790 | container_of(work, struct fw_device, work.work); |
791 | int minor = MINOR(device->device.devt); |
792 | |
793 | if (time_before64(get_jiffies_64(), |
794 | device->card->reset_jiffies + SHUTDOWN_DELAY) |
795 | && !list_empty(head: &device->card->link)) { |
796 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
797 | return; |
798 | } |
799 | |
800 | if (atomic_cmpxchg(v: &device->state, |
801 | old: FW_DEVICE_GONE, |
802 | new: FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) |
803 | return; |
804 | |
805 | fw_device_cdev_remove(device); |
806 | device_for_each_child(dev: &device->device, NULL, fn: shutdown_unit); |
807 | device_unregister(dev: &device->device); |
808 | |
809 | down_write(sem: &fw_device_rwsem); |
810 | idr_remove(&fw_device_idr, id: minor); |
811 | up_write(sem: &fw_device_rwsem); |
812 | |
813 | fw_device_put(device); |
814 | } |
815 | |
816 | static void fw_device_release(struct device *dev) |
817 | { |
818 | struct fw_device *device = fw_device(dev); |
819 | struct fw_card *card = device->card; |
820 | unsigned long flags; |
821 | |
822 | /* |
823 | * Take the card lock so we don't set this to NULL while a |
824 | * FW_NODE_UPDATED callback is being handled or while the |
825 | * bus manager work looks at this node. |
826 | */ |
827 | spin_lock_irqsave(&card->lock, flags); |
828 | device->node->data = NULL; |
829 | spin_unlock_irqrestore(lock: &card->lock, flags); |
830 | |
831 | fw_node_put(node: device->node); |
832 | kfree(objp: device->config_rom); |
833 | kfree(objp: device); |
834 | fw_card_put(card); |
835 | } |
836 | |
837 | static struct device_type fw_device_type = { |
838 | .release = fw_device_release, |
839 | }; |
840 | |
841 | static bool is_fw_device(struct device *dev) |
842 | { |
843 | return dev->type == &fw_device_type; |
844 | } |
845 | |
846 | static int update_unit(struct device *dev, void *data) |
847 | { |
848 | struct fw_unit *unit = fw_unit(dev); |
849 | struct fw_driver *driver = (struct fw_driver *)dev->driver; |
850 | |
851 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
852 | device_lock(dev); |
853 | driver->update(unit); |
854 | device_unlock(dev); |
855 | } |
856 | |
857 | return 0; |
858 | } |
859 | |
860 | static void fw_device_update(struct work_struct *work) |
861 | { |
862 | struct fw_device *device = |
863 | container_of(work, struct fw_device, work.work); |
864 | |
865 | fw_device_cdev_update(device); |
866 | device_for_each_child(dev: &device->device, NULL, fn: update_unit); |
867 | } |
868 | |
869 | /* |
870 | * If a device was pending for deletion because its node went away but its |
871 | * bus info block and root directory header matches that of a newly discovered |
872 | * device, revive the existing fw_device. |
873 | * The newly allocated fw_device becomes obsolete instead. |
874 | */ |
875 | static int lookup_existing_device(struct device *dev, void *data) |
876 | { |
877 | struct fw_device *old = fw_device(dev); |
878 | struct fw_device *new = data; |
879 | struct fw_card *card = new->card; |
880 | int match = 0; |
881 | |
882 | if (!is_fw_device(dev)) |
883 | return 0; |
884 | |
885 | down_read(sem: &fw_device_rwsem); /* serialize config_rom access */ |
886 | spin_lock_irq(lock: &card->lock); /* serialize node access */ |
887 | |
888 | if (memcmp(p: old->config_rom, q: new->config_rom, size: 6 * 4) == 0 && |
889 | atomic_cmpxchg(v: &old->state, |
890 | old: FW_DEVICE_GONE, |
891 | new: FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { |
892 | struct fw_node *current_node = new->node; |
893 | struct fw_node *obsolete_node = old->node; |
894 | |
895 | new->node = obsolete_node; |
896 | new->node->data = new; |
897 | old->node = current_node; |
898 | old->node->data = old; |
899 | |
900 | old->max_speed = new->max_speed; |
901 | old->node_id = current_node->node_id; |
902 | smp_wmb(); /* update node_id before generation */ |
903 | old->generation = card->generation; |
904 | old->config_rom_retries = 0; |
905 | fw_notice(card, fmt: "rediscovered device %s\n" , dev_name(dev)); |
906 | |
907 | old->workfn = fw_device_update; |
908 | fw_schedule_device_work(device: old, delay: 0); |
909 | |
910 | if (current_node == card->root_node) |
911 | fw_schedule_bm_work(card, delay: 0); |
912 | |
913 | match = 1; |
914 | } |
915 | |
916 | spin_unlock_irq(lock: &card->lock); |
917 | up_read(sem: &fw_device_rwsem); |
918 | |
919 | return match; |
920 | } |
921 | |
922 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
923 | |
924 | static void set_broadcast_channel(struct fw_device *device, int generation) |
925 | { |
926 | struct fw_card *card = device->card; |
927 | __be32 data; |
928 | int rcode; |
929 | |
930 | if (!card->broadcast_channel_allocated) |
931 | return; |
932 | |
933 | /* |
934 | * The Broadcast_Channel Valid bit is required by nodes which want to |
935 | * transmit on this channel. Such transmissions are practically |
936 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required |
937 | * to be IRM capable and have a max_rec of 8 or more. We use this fact |
938 | * to narrow down to which nodes we send Broadcast_Channel updates. |
939 | */ |
940 | if (!device->irmc || device->max_rec < 8) |
941 | return; |
942 | |
943 | /* |
944 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. |
945 | * Perform a read test first. |
946 | */ |
947 | if (device->bc_implemented == BC_UNKNOWN) { |
948 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, |
949 | destination_id: device->node_id, generation, speed: device->max_speed, |
950 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, |
951 | payload: &data, length: 4); |
952 | switch (rcode) { |
953 | case RCODE_COMPLETE: |
954 | if (data & cpu_to_be32(1 << 31)) { |
955 | device->bc_implemented = BC_IMPLEMENTED; |
956 | break; |
957 | } |
958 | fallthrough; /* to case address error */ |
959 | case RCODE_ADDRESS_ERROR: |
960 | device->bc_implemented = BC_UNIMPLEMENTED; |
961 | } |
962 | } |
963 | |
964 | if (device->bc_implemented == BC_IMPLEMENTED) { |
965 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | |
966 | BROADCAST_CHANNEL_VALID); |
967 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, |
968 | destination_id: device->node_id, generation, speed: device->max_speed, |
969 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, |
970 | payload: &data, length: 4); |
971 | } |
972 | } |
973 | |
974 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
975 | { |
976 | if (is_fw_device(dev)) |
977 | set_broadcast_channel(fw_device(dev), generation: (long)gen); |
978 | |
979 | return 0; |
980 | } |
981 | |
982 | static void fw_device_init(struct work_struct *work) |
983 | { |
984 | struct fw_device *device = |
985 | container_of(work, struct fw_device, work.work); |
986 | struct fw_card *card = device->card; |
987 | struct device *revived_dev; |
988 | int minor, ret; |
989 | |
990 | /* |
991 | * All failure paths here set node->data to NULL, so that we |
992 | * don't try to do device_for_each_child() on a kfree()'d |
993 | * device. |
994 | */ |
995 | |
996 | ret = read_config_rom(device, generation: device->generation); |
997 | if (ret != RCODE_COMPLETE) { |
998 | if (device->config_rom_retries < MAX_RETRIES && |
999 | atomic_read(v: &device->state) == FW_DEVICE_INITIALIZING) { |
1000 | device->config_rom_retries++; |
1001 | fw_schedule_device_work(device, RETRY_DELAY); |
1002 | } else { |
1003 | if (device->node->link_on) |
1004 | fw_notice(card, fmt: "giving up on node %x: reading config rom failed: %s\n" , |
1005 | device->node_id, |
1006 | fw_rcode_string(rcode: ret)); |
1007 | if (device->node == card->root_node) |
1008 | fw_schedule_bm_work(card, delay: 0); |
1009 | fw_device_release(dev: &device->device); |
1010 | } |
1011 | return; |
1012 | } |
1013 | |
1014 | revived_dev = device_find_child(dev: card->device, |
1015 | data: device, match: lookup_existing_device); |
1016 | if (revived_dev) { |
1017 | put_device(dev: revived_dev); |
1018 | fw_device_release(dev: &device->device); |
1019 | |
1020 | return; |
1021 | } |
1022 | |
1023 | device_initialize(dev: &device->device); |
1024 | |
1025 | fw_device_get(device); |
1026 | down_write(sem: &fw_device_rwsem); |
1027 | minor = idr_alloc(&fw_device_idr, ptr: device, start: 0, end: 1 << MINORBITS, |
1028 | GFP_KERNEL); |
1029 | up_write(sem: &fw_device_rwsem); |
1030 | |
1031 | if (minor < 0) |
1032 | goto error; |
1033 | |
1034 | device->device.bus = &fw_bus_type; |
1035 | device->device.type = &fw_device_type; |
1036 | device->device.parent = card->device; |
1037 | device->device.devt = MKDEV(fw_cdev_major, minor); |
1038 | dev_set_name(dev: &device->device, name: "fw%d" , minor); |
1039 | |
1040 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
1041 | ARRAY_SIZE(fw_device_attributes) + |
1042 | ARRAY_SIZE(config_rom_attributes)); |
1043 | init_fw_attribute_group(dev: &device->device, |
1044 | attrs: fw_device_attributes, |
1045 | group: &device->attribute_group); |
1046 | |
1047 | if (device_add(dev: &device->device)) { |
1048 | fw_err(card, fmt: "failed to add device\n" ); |
1049 | goto error_with_cdev; |
1050 | } |
1051 | |
1052 | create_units(device); |
1053 | |
1054 | /* |
1055 | * Transition the device to running state. If it got pulled |
1056 | * out from under us while we did the initialization work, we |
1057 | * have to shut down the device again here. Normally, though, |
1058 | * fw_node_event will be responsible for shutting it down when |
1059 | * necessary. We have to use the atomic cmpxchg here to avoid |
1060 | * racing with the FW_NODE_DESTROYED case in |
1061 | * fw_node_event(). |
1062 | */ |
1063 | if (atomic_cmpxchg(v: &device->state, |
1064 | old: FW_DEVICE_INITIALIZING, |
1065 | new: FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { |
1066 | device->workfn = fw_device_shutdown; |
1067 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
1068 | } else { |
1069 | fw_notice(card, fmt: "created device %s: GUID %08x%08x, S%d00\n" , |
1070 | dev_name(dev: &device->device), |
1071 | device->config_rom[3], device->config_rom[4], |
1072 | 1 << device->max_speed); |
1073 | device->config_rom_retries = 0; |
1074 | |
1075 | set_broadcast_channel(device, generation: device->generation); |
1076 | |
1077 | add_device_randomness(buf: &device->config_rom[3], len: 8); |
1078 | } |
1079 | |
1080 | /* |
1081 | * Reschedule the IRM work if we just finished reading the |
1082 | * root node config rom. If this races with a bus reset we |
1083 | * just end up running the IRM work a couple of extra times - |
1084 | * pretty harmless. |
1085 | */ |
1086 | if (device->node == card->root_node) |
1087 | fw_schedule_bm_work(card, delay: 0); |
1088 | |
1089 | return; |
1090 | |
1091 | error_with_cdev: |
1092 | down_write(sem: &fw_device_rwsem); |
1093 | idr_remove(&fw_device_idr, id: minor); |
1094 | up_write(sem: &fw_device_rwsem); |
1095 | error: |
1096 | fw_device_put(device); /* fw_device_idr's reference */ |
1097 | |
1098 | put_device(dev: &device->device); /* our reference */ |
1099 | } |
1100 | |
1101 | /* Reread and compare bus info block and header of root directory */ |
1102 | static int reread_config_rom(struct fw_device *device, int generation, |
1103 | bool *changed) |
1104 | { |
1105 | u32 q; |
1106 | int i, rcode; |
1107 | |
1108 | for (i = 0; i < 6; i++) { |
1109 | rcode = read_rom(device, generation, index: i, data: &q); |
1110 | if (rcode != RCODE_COMPLETE) |
1111 | return rcode; |
1112 | |
1113 | if (i == 0 && q == 0) |
1114 | /* inaccessible (see read_config_rom); retry later */ |
1115 | return RCODE_BUSY; |
1116 | |
1117 | if (q != device->config_rom[i]) { |
1118 | *changed = true; |
1119 | return RCODE_COMPLETE; |
1120 | } |
1121 | } |
1122 | |
1123 | *changed = false; |
1124 | return RCODE_COMPLETE; |
1125 | } |
1126 | |
1127 | static void fw_device_refresh(struct work_struct *work) |
1128 | { |
1129 | struct fw_device *device = |
1130 | container_of(work, struct fw_device, work.work); |
1131 | struct fw_card *card = device->card; |
1132 | int ret, node_id = device->node_id; |
1133 | bool changed; |
1134 | |
1135 | ret = reread_config_rom(device, generation: device->generation, changed: &changed); |
1136 | if (ret != RCODE_COMPLETE) |
1137 | goto failed_config_rom; |
1138 | |
1139 | if (!changed) { |
1140 | if (atomic_cmpxchg(v: &device->state, |
1141 | old: FW_DEVICE_INITIALIZING, |
1142 | new: FW_DEVICE_RUNNING) == FW_DEVICE_GONE) |
1143 | goto gone; |
1144 | |
1145 | fw_device_update(work); |
1146 | device->config_rom_retries = 0; |
1147 | goto out; |
1148 | } |
1149 | |
1150 | /* |
1151 | * Something changed. We keep things simple and don't investigate |
1152 | * further. We just destroy all previous units and create new ones. |
1153 | */ |
1154 | device_for_each_child(dev: &device->device, NULL, fn: shutdown_unit); |
1155 | |
1156 | ret = read_config_rom(device, generation: device->generation); |
1157 | if (ret != RCODE_COMPLETE) |
1158 | goto failed_config_rom; |
1159 | |
1160 | fw_device_cdev_update(device); |
1161 | create_units(device); |
1162 | |
1163 | /* Userspace may want to re-read attributes. */ |
1164 | kobject_uevent(kobj: &device->device.kobj, action: KOBJ_CHANGE); |
1165 | |
1166 | if (atomic_cmpxchg(v: &device->state, |
1167 | old: FW_DEVICE_INITIALIZING, |
1168 | new: FW_DEVICE_RUNNING) == FW_DEVICE_GONE) |
1169 | goto gone; |
1170 | |
1171 | fw_notice(card, fmt: "refreshed device %s\n" , dev_name(dev: &device->device)); |
1172 | device->config_rom_retries = 0; |
1173 | goto out; |
1174 | |
1175 | failed_config_rom: |
1176 | if (device->config_rom_retries < MAX_RETRIES && |
1177 | atomic_read(v: &device->state) == FW_DEVICE_INITIALIZING) { |
1178 | device->config_rom_retries++; |
1179 | fw_schedule_device_work(device, RETRY_DELAY); |
1180 | return; |
1181 | } |
1182 | |
1183 | fw_notice(card, fmt: "giving up on refresh of device %s: %s\n" , |
1184 | dev_name(dev: &device->device), fw_rcode_string(rcode: ret)); |
1185 | gone: |
1186 | atomic_set(v: &device->state, i: FW_DEVICE_GONE); |
1187 | device->workfn = fw_device_shutdown; |
1188 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
1189 | out: |
1190 | if (node_id == card->root_node->node_id) |
1191 | fw_schedule_bm_work(card, delay: 0); |
1192 | } |
1193 | |
1194 | static void fw_device_workfn(struct work_struct *work) |
1195 | { |
1196 | struct fw_device *device = container_of(to_delayed_work(work), |
1197 | struct fw_device, work); |
1198 | device->workfn(work); |
1199 | } |
1200 | |
1201 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1202 | { |
1203 | struct fw_device *device; |
1204 | |
1205 | switch (event) { |
1206 | case FW_NODE_CREATED: |
1207 | /* |
1208 | * Attempt to scan the node, regardless whether its self ID has |
1209 | * the L (link active) flag set or not. Some broken devices |
1210 | * send L=0 but have an up-and-running link; others send L=1 |
1211 | * without actually having a link. |
1212 | */ |
1213 | create: |
1214 | device = kzalloc(size: sizeof(*device), GFP_ATOMIC); |
1215 | if (device == NULL) |
1216 | break; |
1217 | |
1218 | /* |
1219 | * Do minimal initialization of the device here, the |
1220 | * rest will happen in fw_device_init(). |
1221 | * |
1222 | * Attention: A lot of things, even fw_device_get(), |
1223 | * cannot be done before fw_device_init() finished! |
1224 | * You can basically just check device->state and |
1225 | * schedule work until then, but only while holding |
1226 | * card->lock. |
1227 | */ |
1228 | atomic_set(v: &device->state, i: FW_DEVICE_INITIALIZING); |
1229 | device->card = fw_card_get(card); |
1230 | device->node = fw_node_get(node); |
1231 | device->node_id = node->node_id; |
1232 | device->generation = card->generation; |
1233 | device->is_local = node == card->local_node; |
1234 | mutex_init(&device->client_list_mutex); |
1235 | INIT_LIST_HEAD(list: &device->client_list); |
1236 | |
1237 | /* |
1238 | * Set the node data to point back to this device so |
1239 | * FW_NODE_UPDATED callbacks can update the node_id |
1240 | * and generation for the device. |
1241 | */ |
1242 | node->data = device; |
1243 | |
1244 | /* |
1245 | * Many devices are slow to respond after bus resets, |
1246 | * especially if they are bus powered and go through |
1247 | * power-up after getting plugged in. We schedule the |
1248 | * first config rom scan half a second after bus reset. |
1249 | */ |
1250 | device->workfn = fw_device_init; |
1251 | INIT_DELAYED_WORK(&device->work, fw_device_workfn); |
1252 | fw_schedule_device_work(device, INITIAL_DELAY); |
1253 | break; |
1254 | |
1255 | case FW_NODE_INITIATED_RESET: |
1256 | case FW_NODE_LINK_ON: |
1257 | device = node->data; |
1258 | if (device == NULL) |
1259 | goto create; |
1260 | |
1261 | device->node_id = node->node_id; |
1262 | smp_wmb(); /* update node_id before generation */ |
1263 | device->generation = card->generation; |
1264 | if (atomic_cmpxchg(v: &device->state, |
1265 | old: FW_DEVICE_RUNNING, |
1266 | new: FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { |
1267 | device->workfn = fw_device_refresh; |
1268 | fw_schedule_device_work(device, |
1269 | delay: device->is_local ? 0 : INITIAL_DELAY); |
1270 | } |
1271 | break; |
1272 | |
1273 | case FW_NODE_UPDATED: |
1274 | device = node->data; |
1275 | if (device == NULL) |
1276 | break; |
1277 | |
1278 | device->node_id = node->node_id; |
1279 | smp_wmb(); /* update node_id before generation */ |
1280 | device->generation = card->generation; |
1281 | if (atomic_read(v: &device->state) == FW_DEVICE_RUNNING) { |
1282 | device->workfn = fw_device_update; |
1283 | fw_schedule_device_work(device, delay: 0); |
1284 | } |
1285 | break; |
1286 | |
1287 | case FW_NODE_DESTROYED: |
1288 | case FW_NODE_LINK_OFF: |
1289 | if (!node->data) |
1290 | break; |
1291 | |
1292 | /* |
1293 | * Destroy the device associated with the node. There |
1294 | * are two cases here: either the device is fully |
1295 | * initialized (FW_DEVICE_RUNNING) or we're in the |
1296 | * process of reading its config rom |
1297 | * (FW_DEVICE_INITIALIZING). If it is fully |
1298 | * initialized we can reuse device->work to schedule a |
1299 | * full fw_device_shutdown(). If not, there's work |
1300 | * scheduled to read it's config rom, and we just put |
1301 | * the device in shutdown state to have that code fail |
1302 | * to create the device. |
1303 | */ |
1304 | device = node->data; |
1305 | if (atomic_xchg(v: &device->state, |
1306 | new: FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
1307 | device->workfn = fw_device_shutdown; |
1308 | fw_schedule_device_work(device, |
1309 | delay: list_empty(head: &card->link) ? 0 : SHUTDOWN_DELAY); |
1310 | } |
1311 | break; |
1312 | } |
1313 | } |
1314 | |