Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c781c06d KH |
2 | /* |
3 | * Device probing and sysfs code. | |
19a15b93 KH |
4 | * |
5 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
19a15b93 KH |
6 | */ |
7 | ||
d54423c6 | 8 | #include <linux/bug.h> |
41f321c2 | 9 | #include <linux/ctype.h> |
19a15b93 | 10 | #include <linux/delay.h> |
41f321c2 SR |
11 | #include <linux/device.h> |
12 | #include <linux/errno.h> | |
77c9a5da SR |
13 | #include <linux/firewire.h> |
14 | #include <linux/firewire-constants.h> | |
a3aca3da | 15 | #include <linux/idr.h> |
3d36a0df | 16 | #include <linux/jiffies.h> |
41f321c2 SR |
17 | #include <linux/kobject.h> |
18 | #include <linux/list.h> | |
b3b29888 | 19 | #include <linux/mod_devicetable.h> |
e8ca9702 | 20 | #include <linux/module.h> |
d67cfb96 | 21 | #include <linux/mutex.h> |
badfcb24 | 22 | #include <linux/random.h> |
6188e10d | 23 | #include <linux/rwsem.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
cf417e54 | 25 | #include <linux/spinlock.h> |
41f321c2 SR |
26 | #include <linux/string.h> |
27 | #include <linux/workqueue.h> | |
28 | ||
60063497 | 29 | #include <linux/atomic.h> |
e8ca9702 | 30 | #include <asm/byteorder.h> |
41f321c2 | 31 | |
77c9a5da | 32 | #include "core.h" |
19a15b93 | 33 | |
13b302d0 | 34 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) |
19a15b93 KH |
35 | { |
36 | ci->p = p + 1; | |
37 | ci->end = ci->p + (p[0] >> 16); | |
38 | } | |
19a15b93 KH |
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 | } | |
19a15b93 KH |
48 | EXPORT_SYMBOL(fw_csr_iterator_next); |
49 | ||
13b302d0 | 50 | static const u32 *search_leaf(const u32 *directory, int search_key) |
1f8fef7b CL |
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; | |
3c2c58cb | 60 | |
1f8fef7b CL |
61 | last_key = key; |
62 | } | |
3c2c58cb | 63 | |
1f8fef7b CL |
64 | return NULL; |
65 | } | |
66 | ||
13b302d0 | 67 | static int textual_leaf_to_string(const u32 *block, char *buf, size_t size) |
1f8fef7b | 68 | { |
3c2c58cb SR |
69 | unsigned int quadlets, i; |
70 | char c; | |
1f8fef7b CL |
71 | |
72 | if (!size || !buf) | |
73 | return -EINVAL; | |
74 | ||
3c2c58cb | 75 | quadlets = min(block[0] >> 16, 256U); |
1f8fef7b CL |
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; | |
3c2c58cb SR |
85 | for (i = 0; i < quadlets * 4 && i < size - 1; i++) { |
86 | c = block[i / 4] >> (24 - 8 * (i % 4)); | |
1f8fef7b CL |
87 | if (c == '\0') |
88 | break; | |
3c2c58cb | 89 | buf[i] = c; |
1f8fef7b | 90 | } |
3c2c58cb SR |
91 | buf[i] = '\0'; |
92 | ||
93 | return i; | |
1f8fef7b CL |
94 | } |
95 | ||
96 | /** | |
656b7afd SR |
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 | |
1f8fef7b | 102 | * |
3c2c58cb SR |
103 | * The string is taken from a minimal ASCII text descriptor leaf after |
104 | * the immediate entry with @key. The string is zero-terminated. | |
0238507b SR |
105 | * An overlong string is silently truncated such that it and the |
106 | * zero byte fit into @size. | |
107 | * | |
3c2c58cb | 108 | * Returns strlen(buf) or a negative error code. |
1f8fef7b | 109 | */ |
13b302d0 | 110 | int fw_csr_string(const u32 *directory, int key, char *buf, size_t size) |
1f8fef7b | 111 | { |
13b302d0 | 112 | const u32 *leaf = search_leaf(directory, key); |
1f8fef7b CL |
113 | if (!leaf) |
114 | return -ENOENT; | |
3c2c58cb | 115 | |
1f8fef7b CL |
116 | return textual_leaf_to_string(leaf, buf, size); |
117 | } | |
118 | EXPORT_SYMBOL(fw_csr_string); | |
119 | ||
fe43d6d9 | 120 | static void get_ids(const u32 *directory, int *id) |
19a15b93 KH |
121 | { |
122 | struct fw_csr_iterator ci; | |
fe43d6d9 | 123 | int key, value; |
19a15b93 | 124 | |
19a15b93 KH |
125 | fw_csr_iterator_init(&ci, directory); |
126 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
fe43d6d9 SR |
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 | } | |
19a15b93 | 133 | } |
fe43d6d9 | 134 | } |
19a15b93 | 135 | |
fe43d6d9 SR |
136 | static void get_modalias_ids(struct fw_unit *unit, int *id) |
137 | { | |
138 | get_ids(&fw_parent_device(unit)->config_rom[5], id); | |
139 | get_ids(unit->directory, id); | |
140 | } | |
19a15b93 | 141 | |
fe43d6d9 SR |
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; | |
19a15b93 KH |
156 | } |
157 | ||
94a87157 SR |
158 | static const struct ieee1394_device_id *unit_match(struct device *dev, |
159 | struct device_driver *drv) | |
19a15b93 | 160 | { |
fe43d6d9 SR |
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}; | |
19a15b93 | 164 | |
fe43d6d9 | 165 | get_modalias_ids(fw_unit(dev), id); |
e41f8d70 | 166 | |
fe43d6d9 SR |
167 | for (; id_table->match_flags != 0; id_table++) |
168 | if (match_ids(id_table, id)) | |
94a87157 | 169 | return id_table; |
19a15b93 | 170 | |
94a87157 SR |
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 | ||
bcabcfd2 | 187 | return driver->probe(fw_unit(dev), unit_match(dev, dev->driver)); |
94a87157 SR |
188 | } |
189 | ||
fc7a6209 | 190 | static void fw_unit_remove(struct device *dev) |
94a87157 SR |
191 | { |
192 | struct fw_driver *driver = | |
193 | container_of(dev->driver, struct fw_driver, driver); | |
194 | ||
b2c852f4 | 195 | driver->remove(fw_unit(dev)); |
19a15b93 KH |
196 | } |
197 | ||
198 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
199 | { | |
5ae73518 | 200 | int id[] = {0, 0, 0, 0}; |
19a15b93 | 201 | |
fe43d6d9 | 202 | get_modalias_ids(unit, id); |
19a15b93 KH |
203 | |
204 | return snprintf(buffer, buffer_size, | |
205 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
5ae73518 | 206 | id[0], id[1], id[2], id[3]); |
19a15b93 KH |
207 | } |
208 | ||
53dca511 | 209 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
210 | { |
211 | struct fw_unit *unit = fw_unit(dev); | |
212 | char modalias[64]; | |
19a15b93 | 213 | |
2d826cc5 | 214 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 215 | |
7eff2e7a | 216 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
217 | return -ENOMEM; |
218 | ||
19a15b93 KH |
219 | return 0; |
220 | } | |
221 | ||
222 | struct bus_type fw_bus_type = { | |
362c2c8c | 223 | .name = "firewire", |
19a15b93 | 224 | .match = fw_unit_match, |
94a87157 SR |
225 | .probe = fw_unit_probe, |
226 | .remove = fw_unit_remove, | |
19a15b93 | 227 | }; |
19a15b93 KH |
228 | EXPORT_SYMBOL(fw_bus_type); |
229 | ||
19a15b93 KH |
230 | int fw_device_enable_phys_dma(struct fw_device *device) |
231 | { | |
b5d2a5e0 SR |
232 | int generation = device->generation; |
233 | ||
234 | /* device->node_id, accessed below, must not be older than generation */ | |
235 | smp_rmb(); | |
236 | ||
19a15b93 KH |
237 | return device->card->driver->enable_phys_dma(device->card, |
238 | device->node_id, | |
b5d2a5e0 | 239 | generation); |
19a15b93 | 240 | } |
19a15b93 KH |
241 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
242 | ||
7feb9cce KH |
243 | struct config_rom_attribute { |
244 | struct device_attribute attr; | |
245 | u32 key; | |
246 | }; | |
247 | ||
53dca511 SR |
248 | static ssize_t show_immediate(struct device *dev, |
249 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
250 | { |
251 | struct config_rom_attribute *attr = | |
252 | container_of(dattr, struct config_rom_attribute, attr); | |
253 | struct fw_csr_iterator ci; | |
13b302d0 | 254 | const u32 *dir; |
c9755e14 SR |
255 | int key, value, ret = -ENOENT; |
256 | ||
257 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
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)) | |
c9755e14 SR |
266 | if (attr->key == key) { |
267 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
268 | "0x%06x\n", value); | |
269 | break; | |
270 | } | |
271 | ||
272 | up_read(&fw_device_rwsem); | |
7feb9cce | 273 | |
c9755e14 | 274 | return ret; |
7feb9cce KH |
275 | } |
276 | ||
277 | #define IMMEDIATE_ATTR(name, key) \ | |
278 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
279 | ||
53dca511 SR |
280 | static ssize_t show_text_leaf(struct device *dev, |
281 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
282 | { |
283 | struct config_rom_attribute *attr = | |
284 | container_of(dattr, struct config_rom_attribute, attr); | |
13b302d0 | 285 | const u32 *dir; |
1f8fef7b CL |
286 | size_t bufsize; |
287 | char dummy_buf[2]; | |
288 | int ret; | |
7feb9cce | 289 | |
c9755e14 SR |
290 | down_read(&fw_device_rwsem); |
291 | ||
7feb9cce KH |
292 | if (is_fw_unit(dev)) |
293 | dir = fw_unit(dev)->directory; | |
294 | else | |
295 | dir = fw_device(dev)->config_rom + 5; | |
296 | ||
1f8fef7b CL |
297 | if (buf) { |
298 | bufsize = PAGE_SIZE - 1; | |
299 | } else { | |
300 | buf = dummy_buf; | |
301 | bufsize = 1; | |
7feb9cce KH |
302 | } |
303 | ||
1f8fef7b | 304 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
7feb9cce | 305 | |
1f8fef7b CL |
306 | if (ret >= 0) { |
307 | /* Strip trailing whitespace and add newline. */ | |
308 | while (ret > 0 && isspace(buf[ret - 1])) | |
309 | ret--; | |
310 | strcpy(buf + ret, "\n"); | |
311 | ret++; | |
c9755e14 | 312 | } |
7feb9cce | 313 | |
c9755e14 | 314 | up_read(&fw_device_rwsem); |
7feb9cce | 315 | |
c9755e14 | 316 | return ret; |
7feb9cce KH |
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 | ||
53dca511 SR |
333 | static void init_fw_attribute_group(struct device *dev, |
334 | struct device_attribute *attrs, | |
335 | struct fw_attribute_group *group) | |
7feb9cce KH |
336 | { |
337 | struct device_attribute *attr; | |
6f2e53d5 KH |
338 | int i, j; |
339 | ||
340 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
341 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
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; | |
6f2e53d5 | 347 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
348 | } |
349 | ||
e5333db9 | 350 | group->attrs[j] = NULL; |
6f2e53d5 KH |
351 | group->groups[0] = &group->group; |
352 | group->groups[1] = NULL; | |
353 | group->group.attrs = group->attrs; | |
a4dbd674 | 354 | dev->groups = (const struct attribute_group **) group->groups; |
7feb9cce KH |
355 | } |
356 | ||
53dca511 SR |
357 | static ssize_t modalias_show(struct device *dev, |
358 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
359 | { |
360 | struct fw_unit *unit = fw_unit(dev); | |
361 | int length; | |
362 | ||
363 | length = get_modalias(unit, buf, PAGE_SIZE); | |
364 | strcpy(buf + length, "\n"); | |
365 | ||
366 | return length + 1; | |
367 | } | |
368 | ||
53dca511 SR |
369 | static ssize_t rom_index_show(struct device *dev, |
370 | struct device_attribute *attr, char *buf) | |
19a15b93 | 371 | { |
21351dbe KH |
372 | struct fw_device *device = fw_device(dev->parent); |
373 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 374 | |
2328fe7a | 375 | return sysfs_emit(buf, "%td\n", unit->directory - device->config_rom); |
19a15b93 KH |
376 | } |
377 | ||
21351dbe KH |
378 | static struct device_attribute fw_unit_attributes[] = { |
379 | __ATTR_RO(modalias), | |
380 | __ATTR_RO(rom_index), | |
381 | __ATTR_NULL, | |
19a15b93 KH |
382 | }; |
383 | ||
53dca511 SR |
384 | static ssize_t config_rom_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) | |
048961ef | 386 | { |
21351dbe | 387 | struct fw_device *device = fw_device(dev); |
c9755e14 | 388 | size_t length; |
048961ef | 389 | |
c9755e14 SR |
390 | down_read(&fw_device_rwsem); |
391 | length = device->config_rom_length * 4; | |
392 | memcpy(buf, device->config_rom, length); | |
393 | up_read(&fw_device_rwsem); | |
21351dbe | 394 | |
c9755e14 | 395 | return length; |
048961ef KH |
396 | } |
397 | ||
53dca511 SR |
398 | static ssize_t guid_show(struct device *dev, |
399 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
400 | { |
401 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
402 | int ret; |
403 | ||
404 | down_read(&fw_device_rwsem); | |
2328fe7a | 405 | ret = sysfs_emit(buf, "0x%08x%08x\n", device->config_rom[3], device->config_rom[4]); |
c9755e14 | 406 | up_read(&fw_device_rwsem); |
bbd14945 | 407 | |
c9755e14 | 408 | return ret; |
bbd14945 KH |
409 | } |
410 | ||
baedee17 CL |
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, "%u\n", device->is_local); | |
417 | } | |
418 | ||
13b302d0 | 419 | static int units_sprintf(char *buf, const u32 *directory) |
0210b66d SR |
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, "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(&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[i], ci.p + value - 1); | |
454 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
455 | break; | |
456 | } | |
457 | up_read(&fw_device_rwsem); | |
458 | ||
459 | if (i) | |
460 | buf[i - 1] = '\n'; | |
461 | ||
462 | return i; | |
463 | } | |
464 | ||
21351dbe KH |
465 | static struct device_attribute fw_device_attributes[] = { |
466 | __ATTR_RO(config_rom), | |
bbd14945 | 467 | __ATTR_RO(guid), |
baedee17 | 468 | __ATTR_RO(is_local), |
0210b66d | 469 | __ATTR_RO(units), |
21351dbe | 470 | __ATTR_NULL, |
048961ef KH |
471 | }; |
472 | ||
53dca511 SR |
473 | static int read_rom(struct fw_device *device, |
474 | int generation, int index, u32 *data) | |
19a15b93 | 475 | { |
aaff1203 SR |
476 | u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4; |
477 | int i, rcode; | |
b5d2a5e0 SR |
478 | |
479 | /* device->node_id, accessed below, must not be older than generation */ | |
480 | smp_rmb(); | |
19a15b93 | 481 | |
aaff1203 SR |
482 | for (i = 10; i < 100; i += 10) { |
483 | rcode = fw_run_transaction(device->card, | |
484 | TCODE_READ_QUADLET_REQUEST, device->node_id, | |
485 | generation, device->max_speed, offset, data, 4); | |
486 | if (rcode != RCODE_BUSY) | |
487 | break; | |
488 | msleep(i); | |
489 | } | |
1e119fa9 | 490 | be32_to_cpus(data); |
19a15b93 | 491 | |
1e119fa9 | 492 | return rcode; |
19a15b93 KH |
493 | } |
494 | ||
fd6e0c51 | 495 | #define MAX_CONFIG_ROM_SIZE 256 |
1dadff71 | 496 | |
f8d2dc39 SR |
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 | |
fd6e0c51 | 500 | * generation changes under us, read_config_rom will fail and get retried. |
f8d2dc39 SR |
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. | |
94fba9fb | 503 | * Returns either a result code or a negative error code. |
f8d2dc39 | 504 | */ |
fd6e0c51 | 505 | static int read_config_rom(struct fw_device *device, int generation) |
19a15b93 | 506 | { |
26b4950d | 507 | struct fw_card *card = device->card; |
13b302d0 SR |
508 | const u32 *old_rom, *new_rom; |
509 | u32 *rom, *stack; | |
1dadff71 | 510 | u32 sp, key; |
94fba9fb | 511 | int i, end, length, ret; |
1dadff71 | 512 | |
fd6e0c51 SR |
513 | rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE + |
514 | sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL); | |
1dadff71 SR |
515 | if (rom == NULL) |
516 | return -ENOMEM; | |
517 | ||
fd6e0c51 SR |
518 | stack = &rom[MAX_CONFIG_ROM_SIZE]; |
519 | memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE); | |
19a15b93 | 520 | |
f1397490 SR |
521 | device->max_speed = SCODE_100; |
522 | ||
19a15b93 KH |
523 | /* First read the bus info block. */ |
524 | for (i = 0; i < 5; i++) { | |
94fba9fb CL |
525 | ret = read_rom(device, generation, i, &rom[i]); |
526 | if (ret != RCODE_COMPLETE) | |
1dadff71 | 527 | goto out; |
c781c06d | 528 | /* |
d33ec3b5 | 529 | * As per IEEE1212 7.2, during initialization, devices can |
19a15b93 KH |
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 | |
c781c06d KH |
534 | * retry mechanism will try again later. |
535 | */ | |
94fba9fb CL |
536 | if (i == 0 && rom[i] == 0) { |
537 | ret = RCODE_BUSY; | |
1dadff71 | 538 | goto out; |
94fba9fb | 539 | } |
19a15b93 KH |
540 | } |
541 | ||
f1397490 SR |
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 || | |
26b4950d | 555 | card->beta_repeaters_present) { |
f1397490 SR |
556 | u32 dummy; |
557 | ||
558 | /* for S1600 and S3200 */ | |
559 | if (device->max_speed == SCODE_BETA) | |
26b4950d | 560 | device->max_speed = card->link_speed; |
f1397490 SR |
561 | |
562 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
563 | if (read_rom(device, generation, 0, &dummy) == |
564 | RCODE_COMPLETE) | |
f1397490 SR |
565 | break; |
566 | device->max_speed--; | |
567 | } | |
568 | } | |
569 | ||
c781c06d KH |
570 | /* |
571 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
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 | |
c781c06d KH |
575 | * start things off. |
576 | */ | |
19a15b93 KH |
577 | length = i; |
578 | sp = 0; | |
579 | stack[sp++] = 0xc0000005; | |
580 | while (sp > 0) { | |
c781c06d KH |
581 | /* |
582 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
583 | * lower 24 bits is the offset into the config rom, |
584 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
585 | * block. |
586 | */ | |
19a15b93 KH |
587 | key = stack[--sp]; |
588 | i = key & 0xffffff; | |
94fba9fb CL |
589 | if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) { |
590 | ret = -ENXIO; | |
1dadff71 | 591 | goto out; |
94fba9fb | 592 | } |
19a15b93 KH |
593 | |
594 | /* Read header quadlet for the block to get the length. */ | |
94fba9fb CL |
595 | ret = read_rom(device, generation, i, &rom[i]); |
596 | if (ret != RCODE_COMPLETE) | |
1dadff71 | 597 | goto out; |
19a15b93 | 598 | end = i + (rom[i] >> 16) + 1; |
fd6e0c51 | 599 | if (end > MAX_CONFIG_ROM_SIZE) { |
c781c06d | 600 | /* |
2799d5c5 SR |
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. | |
c781c06d | 604 | */ |
26b4950d SR |
605 | fw_err(card, "skipped invalid ROM block %x at %llx\n", |
606 | rom[i], | |
607 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
2799d5c5 SR |
608 | rom[i] = 0; |
609 | end = i; | |
610 | } | |
611 | i++; | |
19a15b93 | 612 | |
c781c06d KH |
613 | /* |
614 | * Now read in the block. If this is a directory | |
19a15b93 | 615 | * block, check the entries as we read them to see if |
c781c06d KH |
616 | * it references another block, and push it in that case. |
617 | */ | |
d54423c6 | 618 | for (; i < end; i++) { |
94fba9fb CL |
619 | ret = read_rom(device, generation, i, &rom[i]); |
620 | if (ret != RCODE_COMPLETE) | |
1dadff71 | 621 | goto out; |
d54423c6 | 622 | |
58aaa542 | 623 | if ((key >> 30) != 3 || (rom[i] >> 30) < 2) |
d54423c6 SR |
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 | */ | |
fd6e0c51 | 632 | if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) { |
26b4950d SR |
633 | fw_err(card, |
634 | "skipped unsupported ROM entry %x at %llx\n", | |
635 | rom[i], | |
636 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
d54423c6 SR |
637 | rom[i] = 0; |
638 | continue; | |
639 | } | |
640 | stack[sp++] = i + rom[i]; | |
19a15b93 KH |
641 | } |
642 | if (length < i) | |
643 | length = i; | |
644 | } | |
645 | ||
c9755e14 SR |
646 | old_rom = device->config_rom; |
647 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
94fba9fb CL |
648 | if (new_rom == NULL) { |
649 | ret = -ENOMEM; | |
1dadff71 | 650 | goto out; |
94fba9fb | 651 | } |
c9755e14 SR |
652 | |
653 | down_write(&fw_device_rwsem); | |
654 | device->config_rom = new_rom; | |
19a15b93 | 655 | device->config_rom_length = length; |
c9755e14 SR |
656 | up_write(&fw_device_rwsem); |
657 | ||
658 | kfree(old_rom); | |
94fba9fb | 659 | ret = RCODE_COMPLETE; |
837ec787 SR |
660 | device->max_rec = rom[2] >> 12 & 0xf; |
661 | device->cmc = rom[2] >> 30 & 1; | |
662 | device->irmc = rom[2] >> 31 & 1; | |
1dadff71 SR |
663 | out: |
664 | kfree(rom); | |
19a15b93 | 665 | |
1dadff71 | 666 | return ret; |
19a15b93 KH |
667 | } |
668 | ||
669 | static void fw_unit_release(struct device *dev) | |
670 | { | |
671 | struct fw_unit *unit = fw_unit(dev); | |
672 | ||
21076226 | 673 | fw_device_put(fw_parent_device(unit)); |
19a15b93 KH |
674 | kfree(unit); |
675 | } | |
676 | ||
21351dbe | 677 | static struct device_type fw_unit_type = { |
21351dbe KH |
678 | .uevent = fw_unit_uevent, |
679 | .release = fw_unit_release, | |
680 | }; | |
681 | ||
099d5414 | 682 | static bool is_fw_unit(struct device *dev) |
19a15b93 | 683 | { |
21351dbe | 684 | return dev->type == &fw_unit_type; |
19a15b93 KH |
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 | ||
c781c06d KH |
699 | /* |
700 | * Get the address of the unit directory and try to | |
701 | * match the drivers id_tables against it. | |
702 | */ | |
2d826cc5 | 703 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
cfb0c9d1 | 704 | if (unit == NULL) |
19a15b93 | 705 | continue; |
19a15b93 KH |
706 | |
707 | unit->directory = ci.p + value - 1; | |
708 | unit->device.bus = &fw_bus_type; | |
21351dbe | 709 | unit->device.type = &fw_unit_type; |
19a15b93 | 710 | unit->device.parent = &device->device; |
a1f64819 | 711 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 712 | |
e5333db9 SR |
713 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
714 | ARRAY_SIZE(fw_unit_attributes) + | |
715 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
716 | init_fw_attribute_group(&unit->device, |
717 | fw_unit_attributes, | |
718 | &unit->attribute_group); | |
e5333db9 | 719 | |
7feb9cce KH |
720 | if (device_register(&unit->device) < 0) |
721 | goto skip_unit; | |
722 | ||
21076226 | 723 | fw_device_get(device); |
7feb9cce KH |
724 | continue; |
725 | ||
7feb9cce KH |
726 | skip_unit: |
727 | kfree(unit); | |
19a15b93 KH |
728 | } |
729 | } | |
730 | ||
731 | static int shutdown_unit(struct device *device, void *data) | |
732 | { | |
21351dbe | 733 | device_unregister(device); |
19a15b93 KH |
734 | |
735 | return 0; | |
736 | } | |
737 | ||
c9755e14 SR |
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 | ||
d6053e08 | 746 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
747 | int fw_cdev_major; |
748 | ||
96b19062 | 749 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
750 | { |
751 | struct fw_device *device; | |
752 | ||
c9755e14 | 753 | down_read(&fw_device_rwsem); |
a3aca3da | 754 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
755 | if (device) |
756 | fw_device_get(device); | |
c9755e14 | 757 | up_read(&fw_device_rwsem); |
a3aca3da KH |
758 | |
759 | return device; | |
760 | } | |
761 | ||
105e53f8 SR |
762 | struct workqueue_struct *fw_workqueue; |
763 | EXPORT_SYMBOL(fw_workqueue); | |
6ea9e7bb SR |
764 | |
765 | static void fw_schedule_device_work(struct fw_device *device, | |
766 | unsigned long delay) | |
767 | { | |
105e53f8 | 768 | queue_delayed_work(fw_workqueue, &device->work, delay); |
6ea9e7bb SR |
769 | } |
770 | ||
3d36a0df SR |
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 | ||
19a15b93 KH |
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); | |
a3aca3da KH |
791 | int minor = MINOR(device->device.devt); |
792 | ||
e71084af CL |
793 | if (time_before64(get_jiffies_64(), |
794 | device->card->reset_jiffies + SHUTDOWN_DELAY) | |
e747a5c0 | 795 | && !list_empty(&device->card->link)) { |
6ea9e7bb | 796 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
3d36a0df SR |
797 | return; |
798 | } | |
799 | ||
800 | if (atomic_cmpxchg(&device->state, | |
801 | FW_DEVICE_GONE, | |
802 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
803 | return; | |
804 | ||
2603bf21 | 805 | fw_device_cdev_remove(device); |
19a15b93 KH |
806 | device_for_each_child(&device->device, NULL, shutdown_unit); |
807 | device_unregister(&device->device); | |
96b19062 | 808 | |
c9755e14 | 809 | down_write(&fw_device_rwsem); |
96b19062 | 810 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 811 | up_write(&fw_device_rwsem); |
3d36a0df | 812 | |
96b19062 | 813 | fw_device_put(device); |
19a15b93 KH |
814 | } |
815 | ||
aed80892 SR |
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(&card->lock, flags); | |
830 | ||
831 | fw_node_put(device->node); | |
832 | kfree(device->config_rom); | |
833 | kfree(device); | |
834 | fw_card_put(card); | |
835 | } | |
836 | ||
21351dbe | 837 | static struct device_type fw_device_type = { |
aed80892 | 838 | .release = fw_device_release, |
21351dbe KH |
839 | }; |
840 | ||
099d5414 SR |
841 | static bool is_fw_device(struct device *dev) |
842 | { | |
843 | return dev->type == &fw_device_type; | |
844 | } | |
845 | ||
aed80892 SR |
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) { | |
8e9394ce | 852 | device_lock(dev); |
aed80892 | 853 | driver->update(unit); |
8e9394ce | 854 | device_unlock(dev); |
aed80892 SR |
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(&device->device, NULL, update_unit); | |
867 | } | |
3d36a0df | 868 | |
c781c06d | 869 | /* |
3d36a0df SR |
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. | |
c781c06d | 874 | */ |
3d36a0df SR |
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 | ||
099d5414 SR |
882 | if (!is_fw_device(dev)) |
883 | return 0; | |
884 | ||
3d36a0df SR |
885 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
886 | spin_lock_irq(&card->lock); /* serialize node access */ | |
887 | ||
888 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
889 | atomic_cmpxchg(&old->state, | |
890 | FW_DEVICE_GONE, | |
891 | 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; | |
26b4950d | 905 | fw_notice(card, "rediscovered device %s\n", dev_name(dev)); |
19a15b93 | 906 | |
70044d71 | 907 | old->workfn = fw_device_update; |
6ea9e7bb | 908 | fw_schedule_device_work(old, 0); |
3d36a0df SR |
909 | |
910 | if (current_node == card->root_node) | |
911 | fw_schedule_bm_work(card, 0); | |
912 | ||
913 | match = 1; | |
914 | } | |
915 | ||
916 | spin_unlock_irq(&card->lock); | |
917 | up_read(&fw_device_rwsem); | |
918 | ||
919 | return match; | |
920 | } | |
19a15b93 | 921 | |
7889b60e SR |
922 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
923 | ||
099d5414 | 924 | static void set_broadcast_channel(struct fw_device *device, int generation) |
7889b60e SR |
925 | { |
926 | struct fw_card *card = device->card; | |
927 | __be32 data; | |
928 | int rcode; | |
929 | ||
930 | if (!card->broadcast_channel_allocated) | |
931 | return; | |
932 | ||
837ec787 SR |
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 | */ | |
7889b60e SR |
947 | if (device->bc_implemented == BC_UNKNOWN) { |
948 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
949 | device->node_id, generation, device->max_speed, | |
950 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
951 | &data, 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 | } | |
df561f66 | 958 | fallthrough; /* to case address error */ |
7889b60e SR |
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 | device->node_id, generation, device->max_speed, | |
969 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
970 | &data, 4); | |
971 | } | |
972 | } | |
973 | ||
099d5414 SR |
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), (long)gen); | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
19a15b93 KH |
982 | static void fw_device_init(struct work_struct *work) |
983 | { | |
19a15b93 KH |
984 | struct fw_device *device = |
985 | container_of(work, struct fw_device, work.work); | |
26b4950d | 986 | struct fw_card *card = device->card; |
3d36a0df | 987 | struct device *revived_dev; |
e1eff7a3 | 988 | int minor, ret; |
19a15b93 | 989 | |
c781c06d KH |
990 | /* |
991 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 992 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
993 | * device. |
994 | */ | |
19a15b93 | 995 | |
94fba9fb CL |
996 | ret = read_config_rom(device, device->generation); |
997 | if (ret != RCODE_COMPLETE) { | |
855c603d SR |
998 | if (device->config_rom_retries < MAX_RETRIES && |
999 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 | 1000 | device->config_rom_retries++; |
6ea9e7bb | 1001 | fw_schedule_device_work(device, RETRY_DELAY); |
19a15b93 | 1002 | } else { |
115881d3 | 1003 | if (device->node->link_on) |
94fba9fb CL |
1004 | fw_notice(card, "giving up on node %x: reading config rom failed: %s\n", |
1005 | device->node_id, | |
1006 | fw_rcode_string(ret)); | |
26b4950d SR |
1007 | if (device->node == card->root_node) |
1008 | fw_schedule_bm_work(card, 0); | |
19a15b93 KH |
1009 | fw_device_release(&device->device); |
1010 | } | |
1011 | return; | |
1012 | } | |
1013 | ||
26b4950d | 1014 | revived_dev = device_find_child(card->device, |
3d36a0df SR |
1015 | device, lookup_existing_device); |
1016 | if (revived_dev) { | |
1017 | put_device(revived_dev); | |
1018 | fw_device_release(&device->device); | |
1019 | ||
1020 | return; | |
1021 | } | |
1022 | ||
62305823 | 1023 | device_initialize(&device->device); |
96b19062 SR |
1024 | |
1025 | fw_device_get(device); | |
c9755e14 | 1026 | down_write(&fw_device_rwsem); |
37b61890 TH |
1027 | minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS, |
1028 | GFP_KERNEL); | |
c9755e14 | 1029 | up_write(&fw_device_rwsem); |
96b19062 | 1030 | |
37b61890 | 1031 | if (minor < 0) |
a3aca3da KH |
1032 | goto error; |
1033 | ||
19a15b93 | 1034 | device->device.bus = &fw_bus_type; |
21351dbe | 1035 | device->device.type = &fw_device_type; |
26b4950d | 1036 | device->device.parent = card->device; |
a3aca3da | 1037 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 1038 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 1039 | |
e5333db9 SR |
1040 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
1041 | ARRAY_SIZE(fw_device_attributes) + | |
1042 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
1043 | init_fw_attribute_group(&device->device, |
1044 | fw_device_attributes, | |
1045 | &device->attribute_group); | |
e5333db9 | 1046 | |
19a15b93 | 1047 | if (device_add(&device->device)) { |
26b4950d | 1048 | fw_err(card, "failed to add device\n"); |
a3aca3da | 1049 | goto error_with_cdev; |
19a15b93 KH |
1050 | } |
1051 | ||
19a15b93 KH |
1052 | create_units(device); |
1053 | ||
c781c06d KH |
1054 | /* |
1055 | * Transition the device to running state. If it got pulled | |
183b8021 | 1056 | * out from under us while we did the initialization work, we |
19a15b93 KH |
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 | |
c781c06d KH |
1061 | * fw_node_event(). |
1062 | */ | |
641f8791 | 1063 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1064 | FW_DEVICE_INITIALIZING, |
1065 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
70044d71 | 1066 | device->workfn = fw_device_shutdown; |
6ea9e7bb | 1067 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
fa6e697b | 1068 | } else { |
26b4950d SR |
1069 | fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n", |
1070 | dev_name(&device->device), | |
1071 | device->config_rom[3], device->config_rom[4], | |
1072 | 1 << device->max_speed); | |
c9755e14 | 1073 | device->config_rom_retries = 0; |
7889b60e | 1074 | |
099d5414 | 1075 | set_broadcast_channel(device, device->generation); |
badfcb24 CL |
1076 | |
1077 | add_device_randomness(&device->config_rom[3], 8); | |
fa6e697b | 1078 | } |
19a15b93 | 1079 | |
c781c06d KH |
1080 | /* |
1081 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
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 - | |
c781c06d KH |
1084 | * pretty harmless. |
1085 | */ | |
26b4950d SR |
1086 | if (device->node == card->root_node) |
1087 | fw_schedule_bm_work(card, 0); | |
19a15b93 KH |
1088 | |
1089 | return; | |
1090 | ||
a3aca3da | 1091 | error_with_cdev: |
c9755e14 | 1092 | down_write(&fw_device_rwsem); |
a3aca3da | 1093 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 1094 | up_write(&fw_device_rwsem); |
373b2edd | 1095 | error: |
96b19062 SR |
1096 | fw_device_put(device); /* fw_device_idr's reference */ |
1097 | ||
1098 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
1099 | } |
1100 | ||
c9755e14 | 1101 | /* Reread and compare bus info block and header of root directory */ |
db7494e2 CL |
1102 | static int reread_config_rom(struct fw_device *device, int generation, |
1103 | bool *changed) | |
c9755e14 SR |
1104 | { |
1105 | u32 q; | |
db7494e2 | 1106 | int i, rcode; |
c9755e14 SR |
1107 | |
1108 | for (i = 0; i < 6; i++) { | |
db7494e2 CL |
1109 | rcode = read_rom(device, generation, i, &q); |
1110 | if (rcode != RCODE_COMPLETE) | |
1111 | return rcode; | |
c9755e14 SR |
1112 | |
1113 | if (i == 0 && q == 0) | |
d33ec3b5 | 1114 | /* inaccessible (see read_config_rom); retry later */ |
db7494e2 | 1115 | return RCODE_BUSY; |
c9755e14 | 1116 | |
db7494e2 CL |
1117 | if (q != device->config_rom[i]) { |
1118 | *changed = true; | |
1119 | return RCODE_COMPLETE; | |
1120 | } | |
c9755e14 SR |
1121 | } |
1122 | ||
db7494e2 CL |
1123 | *changed = false; |
1124 | return RCODE_COMPLETE; | |
c9755e14 SR |
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; | |
db7494e2 CL |
1132 | int ret, node_id = device->node_id; |
1133 | bool changed; | |
c9755e14 | 1134 | |
db7494e2 | 1135 | ret = reread_config_rom(device, device->generation, &changed); |
8527f8e2 CL |
1136 | if (ret != RCODE_COMPLETE) |
1137 | goto failed_config_rom; | |
c9755e14 | 1138 | |
db7494e2 | 1139 | if (!changed) { |
c9755e14 | 1140 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1141 | FW_DEVICE_INITIALIZING, |
1142 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1143 | goto gone; |
1144 | ||
1145 | fw_device_update(work); | |
1146 | device->config_rom_retries = 0; | |
1147 | goto out; | |
c9755e14 SR |
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(&device->device, NULL, shutdown_unit); | |
1155 | ||
94fba9fb | 1156 | ret = read_config_rom(device, device->generation); |
8527f8e2 CL |
1157 | if (ret != RCODE_COMPLETE) |
1158 | goto failed_config_rom; | |
c9755e14 | 1159 | |
8b4f70ba | 1160 | fw_device_cdev_update(device); |
c9755e14 SR |
1161 | create_units(device); |
1162 | ||
0210b66d SR |
1163 | /* Userspace may want to re-read attributes. */ |
1164 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1165 | ||
c9755e14 | 1166 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1167 | FW_DEVICE_INITIALIZING, |
1168 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1169 | goto gone; |
1170 | ||
26b4950d | 1171 | fw_notice(card, "refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1172 | device->config_rom_retries = 0; |
1173 | goto out; | |
1174 | ||
8527f8e2 CL |
1175 | failed_config_rom: |
1176 | if (device->config_rom_retries < MAX_RETRIES && | |
1177 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1178 | device->config_rom_retries++; | |
1179 | fw_schedule_device_work(device, RETRY_DELAY); | |
1180 | return; | |
1181 | } | |
1182 | ||
94fba9fb CL |
1183 | fw_notice(card, "giving up on refresh of device %s: %s\n", |
1184 | dev_name(&device->device), fw_rcode_string(ret)); | |
c9755e14 | 1185 | gone: |
3d36a0df | 1186 | atomic_set(&device->state, FW_DEVICE_GONE); |
70044d71 | 1187 | device->workfn = fw_device_shutdown; |
6ea9e7bb | 1188 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
c9755e14 SR |
1189 | out: |
1190 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1191 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1192 | } |
1193 | ||
70044d71 TH |
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 | ||
19a15b93 KH |
1201 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1202 | { | |
1203 | struct fw_device *device; | |
1204 | ||
19a15b93 KH |
1205 | switch (event) { |
1206 | case FW_NODE_CREATED: | |
115881d3 SR |
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 | */ | |
c9755e14 | 1213 | create: |
19a15b93 KH |
1214 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1215 | if (device == NULL) | |
1216 | break; | |
1217 | ||
c781c06d | 1218 | /* |
183b8021 | 1219 | * Do minimal initialization of the device here, the |
62305823 SR |
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. | |
c781c06d | 1227 | */ |
641f8791 | 1228 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1229 | device->card = fw_card_get(card); |
19a15b93 KH |
1230 | device->node = fw_node_get(node); |
1231 | device->node_id = node->node_id; | |
1232 | device->generation = card->generation; | |
92368890 | 1233 | device->is_local = node == card->local_node; |
d67cfb96 | 1234 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1235 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1236 | |
c781c06d KH |
1237 | /* |
1238 | * Set the node data to point back to this device so | |
19a15b93 | 1239 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1240 | * and generation for the device. |
1241 | */ | |
19a15b93 KH |
1242 | node->data = device; |
1243 | ||
c781c06d KH |
1244 | /* |
1245 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1246 | * especially if they are bus powered and go through |
1247 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1248 | * first config rom scan half a second after bus reset. |
1249 | */ | |
70044d71 TH |
1250 | device->workfn = fw_device_init; |
1251 | INIT_DELAYED_WORK(&device->work, fw_device_workfn); | |
6ea9e7bb | 1252 | fw_schedule_device_work(device, INITIAL_DELAY); |
19a15b93 KH |
1253 | break; |
1254 | ||
c9755e14 | 1255 | case FW_NODE_INITIATED_RESET: |
115881d3 | 1256 | case FW_NODE_LINK_ON: |
c9755e14 SR |
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(&device->state, | |
1265 | FW_DEVICE_RUNNING, | |
1266 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
70044d71 | 1267 | device->workfn = fw_device_refresh; |
6ea9e7bb | 1268 | fw_schedule_device_work(device, |
92368890 | 1269 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1270 | } |
1271 | break; | |
1272 | ||
19a15b93 | 1273 | case FW_NODE_UPDATED: |
115881d3 SR |
1274 | device = node->data; |
1275 | if (device == NULL) | |
19a15b93 KH |
1276 | break; |
1277 | ||
19a15b93 | 1278 | device->node_id = node->node_id; |
b5d2a5e0 | 1279 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1280 | device->generation = card->generation; |
5f480477 | 1281 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
70044d71 | 1282 | device->workfn = fw_device_update; |
6ea9e7bb | 1283 | fw_schedule_device_work(device, 0); |
5f480477 | 1284 | } |
19a15b93 KH |
1285 | break; |
1286 | ||
1287 | case FW_NODE_DESTROYED: | |
1288 | case FW_NODE_LINK_OFF: | |
1289 | if (!node->data) | |
1290 | break; | |
1291 | ||
c781c06d KH |
1292 | /* |
1293 | * Destroy the device associated with the node. There | |
19a15b93 KH |
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 | |
c781c06d KH |
1302 | * to create the device. |
1303 | */ | |
19a15b93 | 1304 | device = node->data; |
641f8791 | 1305 | if (atomic_xchg(&device->state, |
3d36a0df | 1306 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
70044d71 | 1307 | device->workfn = fw_device_shutdown; |
6ea9e7bb | 1308 | fw_schedule_device_work(device, |
e747a5c0 | 1309 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); |
19a15b93 KH |
1310 | } |
1311 | break; | |
1312 | } | |
1313 | } |