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firewire: optimize iso queueing by setting wake only after the last packet
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CommitLineData
c781c06d
KH
1/*
2 * Device probing and sysfs code.
19a15b93
KH
3 *
4 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
d54423c6 21#include <linux/bug.h>
41f321c2 22#include <linux/ctype.h>
19a15b93 23#include <linux/delay.h>
41f321c2
SR
24#include <linux/device.h>
25#include <linux/errno.h>
77c9a5da
SR
26#include <linux/firewire.h>
27#include <linux/firewire-constants.h>
a3aca3da 28#include <linux/idr.h>
3d36a0df 29#include <linux/jiffies.h>
41f321c2
SR
30#include <linux/kobject.h>
31#include <linux/list.h>
b3b29888 32#include <linux/mod_devicetable.h>
e8ca9702 33#include <linux/module.h>
d67cfb96 34#include <linux/mutex.h>
6188e10d 35#include <linux/rwsem.h>
5a0e3ad6 36#include <linux/slab.h>
cf417e54 37#include <linux/spinlock.h>
41f321c2
SR
38#include <linux/string.h>
39#include <linux/workqueue.h>
40
e8ca9702
SR
41#include <asm/atomic.h>
42#include <asm/byteorder.h>
b5d2a5e0 43#include <asm/system.h>
41f321c2 44
77c9a5da 45#include "core.h"
19a15b93 46
13b302d0 47void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
19a15b93
KH
48{
49 ci->p = p + 1;
50 ci->end = ci->p + (p[0] >> 16);
51}
19a15b93
KH
52EXPORT_SYMBOL(fw_csr_iterator_init);
53
54int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
55{
56 *key = *ci->p >> 24;
57 *value = *ci->p & 0xffffff;
58
59 return ci->p++ < ci->end;
60}
19a15b93
KH
61EXPORT_SYMBOL(fw_csr_iterator_next);
62
13b302d0 63static const u32 *search_leaf(const u32 *directory, int search_key)
1f8fef7b
CL
64{
65 struct fw_csr_iterator ci;
66 int last_key = 0, key, value;
67
68 fw_csr_iterator_init(&ci, directory);
69 while (fw_csr_iterator_next(&ci, &key, &value)) {
70 if (last_key == search_key &&
71 key == (CSR_DESCRIPTOR | CSR_LEAF))
72 return ci.p - 1 + value;
3c2c58cb 73
1f8fef7b
CL
74 last_key = key;
75 }
3c2c58cb 76
1f8fef7b
CL
77 return NULL;
78}
79
13b302d0 80static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
1f8fef7b 81{
3c2c58cb
SR
82 unsigned int quadlets, i;
83 char c;
1f8fef7b
CL
84
85 if (!size || !buf)
86 return -EINVAL;
87
3c2c58cb 88 quadlets = min(block[0] >> 16, 256U);
1f8fef7b
CL
89 if (quadlets < 2)
90 return -ENODATA;
91
92 if (block[1] != 0 || block[2] != 0)
93 /* unknown language/character set */
94 return -ENODATA;
95
96 block += 3;
97 quadlets -= 2;
3c2c58cb
SR
98 for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
99 c = block[i / 4] >> (24 - 8 * (i % 4));
1f8fef7b
CL
100 if (c == '\0')
101 break;
3c2c58cb 102 buf[i] = c;
1f8fef7b 103 }
3c2c58cb
SR
104 buf[i] = '\0';
105
106 return i;
1f8fef7b
CL
107}
108
109/**
656b7afd
SR
110 * fw_csr_string() - reads a string from the configuration ROM
111 * @directory: e.g. root directory or unit directory
112 * @key: the key of the preceding directory entry
113 * @buf: where to put the string
114 * @size: size of @buf, in bytes
1f8fef7b 115 *
3c2c58cb
SR
116 * The string is taken from a minimal ASCII text descriptor leaf after
117 * the immediate entry with @key. The string is zero-terminated.
118 * Returns strlen(buf) or a negative error code.
1f8fef7b 119 */
13b302d0 120int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
1f8fef7b 121{
13b302d0 122 const u32 *leaf = search_leaf(directory, key);
1f8fef7b
CL
123 if (!leaf)
124 return -ENOENT;
3c2c58cb 125
1f8fef7b
CL
126 return textual_leaf_to_string(leaf, buf, size);
127}
128EXPORT_SYMBOL(fw_csr_string);
129
fe43d6d9 130static void get_ids(const u32 *directory, int *id)
19a15b93
KH
131{
132 struct fw_csr_iterator ci;
fe43d6d9 133 int key, value;
19a15b93 134
19a15b93
KH
135 fw_csr_iterator_init(&ci, directory);
136 while (fw_csr_iterator_next(&ci, &key, &value)) {
fe43d6d9
SR
137 switch (key) {
138 case CSR_VENDOR: id[0] = value; break;
139 case CSR_MODEL: id[1] = value; break;
140 case CSR_SPECIFIER_ID: id[2] = value; break;
141 case CSR_VERSION: id[3] = value; break;
142 }
19a15b93 143 }
fe43d6d9 144}
19a15b93 145
fe43d6d9
SR
146static void get_modalias_ids(struct fw_unit *unit, int *id)
147{
148 get_ids(&fw_parent_device(unit)->config_rom[5], id);
149 get_ids(unit->directory, id);
150}
19a15b93 151
fe43d6d9
SR
152static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
153{
154 int match = 0;
155
156 if (id[0] == id_table->vendor_id)
157 match |= IEEE1394_MATCH_VENDOR_ID;
158 if (id[1] == id_table->model_id)
159 match |= IEEE1394_MATCH_MODEL_ID;
160 if (id[2] == id_table->specifier_id)
161 match |= IEEE1394_MATCH_SPECIFIER_ID;
162 if (id[3] == id_table->version)
163 match |= IEEE1394_MATCH_VERSION;
164
165 return (match & id_table->match_flags) == id_table->match_flags;
19a15b93
KH
166}
167
fe43d6d9
SR
168static bool is_fw_unit(struct device *dev);
169
19a15b93
KH
170static int fw_unit_match(struct device *dev, struct device_driver *drv)
171{
fe43d6d9
SR
172 const struct ieee1394_device_id *id_table =
173 container_of(drv, struct fw_driver, driver)->id_table;
174 int id[] = {0, 0, 0, 0};
19a15b93
KH
175
176 /* We only allow binding to fw_units. */
177 if (!is_fw_unit(dev))
178 return 0;
179
fe43d6d9 180 get_modalias_ids(fw_unit(dev), id);
e41f8d70 181
fe43d6d9
SR
182 for (; id_table->match_flags != 0; id_table++)
183 if (match_ids(id_table, id))
19a15b93 184 return 1;
19a15b93
KH
185
186 return 0;
187}
188
189static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
190{
5ae73518 191 int id[] = {0, 0, 0, 0};
19a15b93 192
fe43d6d9 193 get_modalias_ids(unit, id);
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KH
194
195 return snprintf(buffer, buffer_size,
196 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
5ae73518 197 id[0], id[1], id[2], id[3]);
19a15b93
KH
198}
199
53dca511 200static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
19a15b93
KH
201{
202 struct fw_unit *unit = fw_unit(dev);
203 char modalias[64];
19a15b93 204
2d826cc5 205 get_modalias(unit, modalias, sizeof(modalias));
19a15b93 206
7eff2e7a 207 if (add_uevent_var(env, "MODALIAS=%s", modalias))
19a15b93
KH
208 return -ENOMEM;
209
19a15b93
KH
210 return 0;
211}
212
213struct bus_type fw_bus_type = {
362c2c8c 214 .name = "firewire",
19a15b93 215 .match = fw_unit_match,
19a15b93 216};
19a15b93
KH
217EXPORT_SYMBOL(fw_bus_type);
218
19a15b93
KH
219int fw_device_enable_phys_dma(struct fw_device *device)
220{
b5d2a5e0
SR
221 int generation = device->generation;
222
223 /* device->node_id, accessed below, must not be older than generation */
224 smp_rmb();
225
19a15b93
KH
226 return device->card->driver->enable_phys_dma(device->card,
227 device->node_id,
b5d2a5e0 228 generation);
19a15b93 229}
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KH
230EXPORT_SYMBOL(fw_device_enable_phys_dma);
231
7feb9cce
KH
232struct config_rom_attribute {
233 struct device_attribute attr;
234 u32 key;
235};
236
53dca511
SR
237static ssize_t show_immediate(struct device *dev,
238 struct device_attribute *dattr, char *buf)
7feb9cce
KH
239{
240 struct config_rom_attribute *attr =
241 container_of(dattr, struct config_rom_attribute, attr);
242 struct fw_csr_iterator ci;
13b302d0 243 const u32 *dir;
c9755e14
SR
244 int key, value, ret = -ENOENT;
245
246 down_read(&fw_device_rwsem);
7feb9cce
KH
247
248 if (is_fw_unit(dev))
249 dir = fw_unit(dev)->directory;
250 else
251 dir = fw_device(dev)->config_rom + 5;
252
253 fw_csr_iterator_init(&ci, dir);
254 while (fw_csr_iterator_next(&ci, &key, &value))
c9755e14
SR
255 if (attr->key == key) {
256 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
257 "0x%06x\n", value);
258 break;
259 }
260
261 up_read(&fw_device_rwsem);
7feb9cce 262
c9755e14 263 return ret;
7feb9cce
KH
264}
265
266#define IMMEDIATE_ATTR(name, key) \
267 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
268
53dca511
SR
269static ssize_t show_text_leaf(struct device *dev,
270 struct device_attribute *dattr, char *buf)
7feb9cce
KH
271{
272 struct config_rom_attribute *attr =
273 container_of(dattr, struct config_rom_attribute, attr);
13b302d0 274 const u32 *dir;
1f8fef7b
CL
275 size_t bufsize;
276 char dummy_buf[2];
277 int ret;
7feb9cce 278
c9755e14
SR
279 down_read(&fw_device_rwsem);
280
7feb9cce
KH
281 if (is_fw_unit(dev))
282 dir = fw_unit(dev)->directory;
283 else
284 dir = fw_device(dev)->config_rom + 5;
285
1f8fef7b
CL
286 if (buf) {
287 bufsize = PAGE_SIZE - 1;
288 } else {
289 buf = dummy_buf;
290 bufsize = 1;
7feb9cce
KH
291 }
292
1f8fef7b 293 ret = fw_csr_string(dir, attr->key, buf, bufsize);
7feb9cce 294
1f8fef7b
CL
295 if (ret >= 0) {
296 /* Strip trailing whitespace and add newline. */
297 while (ret > 0 && isspace(buf[ret - 1]))
298 ret--;
299 strcpy(buf + ret, "\n");
300 ret++;
c9755e14 301 }
7feb9cce 302
c9755e14 303 up_read(&fw_device_rwsem);
7feb9cce 304
c9755e14 305 return ret;
7feb9cce
KH
306}
307
308#define TEXT_LEAF_ATTR(name, key) \
309 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
310
311static struct config_rom_attribute config_rom_attributes[] = {
312 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
313 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
314 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
315 IMMEDIATE_ATTR(version, CSR_VERSION),
316 IMMEDIATE_ATTR(model, CSR_MODEL),
317 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
318 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
319 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
320};
321
53dca511
SR
322static void init_fw_attribute_group(struct device *dev,
323 struct device_attribute *attrs,
324 struct fw_attribute_group *group)
7feb9cce
KH
325{
326 struct device_attribute *attr;
6f2e53d5
KH
327 int i, j;
328
329 for (j = 0; attrs[j].attr.name != NULL; j++)
330 group->attrs[j] = &attrs[j].attr;
7feb9cce
KH
331
332 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
333 attr = &config_rom_attributes[i].attr;
334 if (attr->show(dev, attr, NULL) < 0)
335 continue;
6f2e53d5 336 group->attrs[j++] = &attr->attr;
7feb9cce
KH
337 }
338
e5333db9 339 group->attrs[j] = NULL;
6f2e53d5
KH
340 group->groups[0] = &group->group;
341 group->groups[1] = NULL;
342 group->group.attrs = group->attrs;
a4dbd674 343 dev->groups = (const struct attribute_group **) group->groups;
7feb9cce
KH
344}
345
53dca511
SR
346static ssize_t modalias_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
19a15b93
KH
348{
349 struct fw_unit *unit = fw_unit(dev);
350 int length;
351
352 length = get_modalias(unit, buf, PAGE_SIZE);
353 strcpy(buf + length, "\n");
354
355 return length + 1;
356}
357
53dca511
SR
358static ssize_t rom_index_show(struct device *dev,
359 struct device_attribute *attr, char *buf)
19a15b93 360{
21351dbe
KH
361 struct fw_device *device = fw_device(dev->parent);
362 struct fw_unit *unit = fw_unit(dev);
19a15b93 363
21351dbe
KH
364 return snprintf(buf, PAGE_SIZE, "%d\n",
365 (int)(unit->directory - device->config_rom));
19a15b93
KH
366}
367
21351dbe
KH
368static struct device_attribute fw_unit_attributes[] = {
369 __ATTR_RO(modalias),
370 __ATTR_RO(rom_index),
371 __ATTR_NULL,
19a15b93
KH
372};
373
53dca511
SR
374static ssize_t config_rom_show(struct device *dev,
375 struct device_attribute *attr, char *buf)
048961ef 376{
21351dbe 377 struct fw_device *device = fw_device(dev);
c9755e14 378 size_t length;
048961ef 379
c9755e14
SR
380 down_read(&fw_device_rwsem);
381 length = device->config_rom_length * 4;
382 memcpy(buf, device->config_rom, length);
383 up_read(&fw_device_rwsem);
21351dbe 384
c9755e14 385 return length;
048961ef
KH
386}
387
53dca511
SR
388static ssize_t guid_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
bbd14945
KH
390{
391 struct fw_device *device = fw_device(dev);
c9755e14
SR
392 int ret;
393
394 down_read(&fw_device_rwsem);
395 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
396 device->config_rom[3], device->config_rom[4]);
397 up_read(&fw_device_rwsem);
bbd14945 398
c9755e14 399 return ret;
bbd14945
KH
400}
401
13b302d0 402static int units_sprintf(char *buf, const u32 *directory)
0210b66d
SR
403{
404 struct fw_csr_iterator ci;
405 int key, value;
406 int specifier_id = 0;
407 int version = 0;
408
409 fw_csr_iterator_init(&ci, directory);
410 while (fw_csr_iterator_next(&ci, &key, &value)) {
411 switch (key) {
412 case CSR_SPECIFIER_ID:
413 specifier_id = value;
414 break;
415 case CSR_VERSION:
416 version = value;
417 break;
418 }
419 }
420
421 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
422}
423
424static ssize_t units_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426{
427 struct fw_device *device = fw_device(dev);
428 struct fw_csr_iterator ci;
429 int key, value, i = 0;
430
431 down_read(&fw_device_rwsem);
432 fw_csr_iterator_init(&ci, &device->config_rom[5]);
433 while (fw_csr_iterator_next(&ci, &key, &value)) {
434 if (key != (CSR_UNIT | CSR_DIRECTORY))
435 continue;
436 i += units_sprintf(&buf[i], ci.p + value - 1);
437 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
438 break;
439 }
440 up_read(&fw_device_rwsem);
441
442 if (i)
443 buf[i - 1] = '\n';
444
445 return i;
446}
447
21351dbe
KH
448static struct device_attribute fw_device_attributes[] = {
449 __ATTR_RO(config_rom),
bbd14945 450 __ATTR_RO(guid),
0210b66d 451 __ATTR_RO(units),
21351dbe 452 __ATTR_NULL,
048961ef
KH
453};
454
53dca511
SR
455static int read_rom(struct fw_device *device,
456 int generation, int index, u32 *data)
19a15b93 457{
1e119fa9 458 int rcode;
b5d2a5e0
SR
459
460 /* device->node_id, accessed below, must not be older than generation */
461 smp_rmb();
19a15b93 462
1e119fa9 463 rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST,
b5d2a5e0 464 device->node_id, generation, device->max_speed,
1e119fa9
JF
465 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4,
466 data, 4);
467 be32_to_cpus(data);
19a15b93 468
1e119fa9 469 return rcode;
19a15b93
KH
470}
471
fd6e0c51 472#define MAX_CONFIG_ROM_SIZE 256
1dadff71 473
f8d2dc39
SR
474/*
475 * Read the bus info block, perform a speed probe, and read all of the rest of
476 * the config ROM. We do all this with a cached bus generation. If the bus
fd6e0c51 477 * generation changes under us, read_config_rom will fail and get retried.
f8d2dc39
SR
478 * It's better to start all over in this case because the node from which we
479 * are reading the ROM may have changed the ROM during the reset.
480 */
fd6e0c51 481static int read_config_rom(struct fw_device *device, int generation)
19a15b93 482{
13b302d0
SR
483 const u32 *old_rom, *new_rom;
484 u32 *rom, *stack;
1dadff71
SR
485 u32 sp, key;
486 int i, end, length, ret = -1;
487
fd6e0c51
SR
488 rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
489 sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
1dadff71
SR
490 if (rom == NULL)
491 return -ENOMEM;
492
fd6e0c51
SR
493 stack = &rom[MAX_CONFIG_ROM_SIZE];
494 memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
19a15b93 495
f1397490
SR
496 device->max_speed = SCODE_100;
497
19a15b93
KH
498 /* First read the bus info block. */
499 for (i = 0; i < 5; i++) {
f8d2dc39 500 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
1dadff71 501 goto out;
c781c06d
KH
502 /*
503 * As per IEEE1212 7.2, during power-up, devices can
19a15b93
KH
504 * reply with a 0 for the first quadlet of the config
505 * rom to indicate that they are booting (for example,
506 * if the firmware is on the disk of a external
507 * harddisk). In that case we just fail, and the
c781c06d
KH
508 * retry mechanism will try again later.
509 */
19a15b93 510 if (i == 0 && rom[i] == 0)
1dadff71 511 goto out;
19a15b93
KH
512 }
513
f1397490
SR
514 device->max_speed = device->node->max_speed;
515
516 /*
517 * Determine the speed of
518 * - devices with link speed less than PHY speed,
519 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
520 * - all devices if there are 1394b repeaters.
521 * Note, we cannot use the bus info block's link_spd as starting point
522 * because some buggy firmwares set it lower than necessary and because
523 * 1394-1995 nodes do not have the field.
524 */
525 if ((rom[2] & 0x7) < device->max_speed ||
526 device->max_speed == SCODE_BETA ||
527 device->card->beta_repeaters_present) {
528 u32 dummy;
529
530 /* for S1600 and S3200 */
531 if (device->max_speed == SCODE_BETA)
532 device->max_speed = device->card->link_speed;
533
534 while (device->max_speed > SCODE_100) {
f8d2dc39
SR
535 if (read_rom(device, generation, 0, &dummy) ==
536 RCODE_COMPLETE)
f1397490
SR
537 break;
538 device->max_speed--;
539 }
540 }
541
c781c06d
KH
542 /*
543 * Now parse the config rom. The config rom is a recursive
19a15b93
KH
544 * directory structure so we parse it using a stack of
545 * references to the blocks that make up the structure. We
546 * push a reference to the root directory on the stack to
c781c06d
KH
547 * start things off.
548 */
19a15b93
KH
549 length = i;
550 sp = 0;
551 stack[sp++] = 0xc0000005;
552 while (sp > 0) {
c781c06d
KH
553 /*
554 * Pop the next block reference of the stack. The
19a15b93
KH
555 * lower 24 bits is the offset into the config rom,
556 * the upper 8 bits are the type of the reference the
c781c06d
KH
557 * block.
558 */
19a15b93
KH
559 key = stack[--sp];
560 i = key & 0xffffff;
fd6e0c51 561 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
1dadff71 562 goto out;
19a15b93
KH
563
564 /* Read header quadlet for the block to get the length. */
f8d2dc39 565 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
1dadff71 566 goto out;
19a15b93 567 end = i + (rom[i] >> 16) + 1;
fd6e0c51 568 if (end > MAX_CONFIG_ROM_SIZE) {
c781c06d 569 /*
2799d5c5
SR
570 * This block extends outside the config ROM which is
571 * a firmware bug. Ignore this whole block, i.e.
572 * simply set a fake block length of 0.
c781c06d 573 */
2799d5c5
SR
574 fw_error("skipped invalid ROM block %x at %llx\n",
575 rom[i],
576 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
577 rom[i] = 0;
578 end = i;
579 }
580 i++;
19a15b93 581
c781c06d
KH
582 /*
583 * Now read in the block. If this is a directory
19a15b93 584 * block, check the entries as we read them to see if
c781c06d
KH
585 * it references another block, and push it in that case.
586 */
d54423c6 587 for (; i < end; i++) {
f8d2dc39
SR
588 if (read_rom(device, generation, i, &rom[i]) !=
589 RCODE_COMPLETE)
1dadff71 590 goto out;
d54423c6 591
58aaa542 592 if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
d54423c6
SR
593 continue;
594 /*
595 * Offset points outside the ROM. May be a firmware
596 * bug or an Extended ROM entry (IEEE 1212-2001 clause
597 * 7.7.18). Simply overwrite this pointer here by a
598 * fake immediate entry so that later iterators over
599 * the ROM don't have to check offsets all the time.
600 */
fd6e0c51 601 if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
d54423c6
SR
602 fw_error("skipped unsupported ROM entry %x at %llx\n",
603 rom[i],
604 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
605 rom[i] = 0;
606 continue;
607 }
608 stack[sp++] = i + rom[i];
19a15b93
KH
609 }
610 if (length < i)
611 length = i;
612 }
613
c9755e14
SR
614 old_rom = device->config_rom;
615 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
616 if (new_rom == NULL)
1dadff71 617 goto out;
c9755e14
SR
618
619 down_write(&fw_device_rwsem);
620 device->config_rom = new_rom;
19a15b93 621 device->config_rom_length = length;
c9755e14
SR
622 up_write(&fw_device_rwsem);
623
624 kfree(old_rom);
1dadff71 625 ret = 0;
837ec787
SR
626 device->max_rec = rom[2] >> 12 & 0xf;
627 device->cmc = rom[2] >> 30 & 1;
628 device->irmc = rom[2] >> 31 & 1;
1dadff71
SR
629 out:
630 kfree(rom);
19a15b93 631
1dadff71 632 return ret;
19a15b93
KH
633}
634
635static void fw_unit_release(struct device *dev)
636{
637 struct fw_unit *unit = fw_unit(dev);
638
639 kfree(unit);
640}
641
21351dbe 642static struct device_type fw_unit_type = {
21351dbe
KH
643 .uevent = fw_unit_uevent,
644 .release = fw_unit_release,
645};
646
099d5414 647static bool is_fw_unit(struct device *dev)
19a15b93 648{
21351dbe 649 return dev->type == &fw_unit_type;
19a15b93
KH
650}
651
652static void create_units(struct fw_device *device)
653{
654 struct fw_csr_iterator ci;
655 struct fw_unit *unit;
656 int key, value, i;
657
658 i = 0;
659 fw_csr_iterator_init(&ci, &device->config_rom[5]);
660 while (fw_csr_iterator_next(&ci, &key, &value)) {
661 if (key != (CSR_UNIT | CSR_DIRECTORY))
662 continue;
663
c781c06d
KH
664 /*
665 * Get the address of the unit directory and try to
666 * match the drivers id_tables against it.
667 */
2d826cc5 668 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
19a15b93
KH
669 if (unit == NULL) {
670 fw_error("failed to allocate memory for unit\n");
671 continue;
672 }
673
674 unit->directory = ci.p + value - 1;
675 unit->device.bus = &fw_bus_type;
21351dbe 676 unit->device.type = &fw_unit_type;
19a15b93 677 unit->device.parent = &device->device;
a1f64819 678 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
19a15b93 679
e5333db9
SR
680 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
681 ARRAY_SIZE(fw_unit_attributes) +
682 ARRAY_SIZE(config_rom_attributes));
6f2e53d5
KH
683 init_fw_attribute_group(&unit->device,
684 fw_unit_attributes,
685 &unit->attribute_group);
e5333db9 686
7feb9cce
KH
687 if (device_register(&unit->device) < 0)
688 goto skip_unit;
689
7feb9cce
KH
690 continue;
691
7feb9cce
KH
692 skip_unit:
693 kfree(unit);
19a15b93
KH
694 }
695}
696
697static int shutdown_unit(struct device *device, void *data)
698{
21351dbe 699 device_unregister(device);
19a15b93
KH
700
701 return 0;
702}
703
c9755e14
SR
704/*
705 * fw_device_rwsem acts as dual purpose mutex:
706 * - serializes accesses to fw_device_idr,
707 * - serializes accesses to fw_device.config_rom/.config_rom_length and
708 * fw_unit.directory, unless those accesses happen at safe occasions
709 */
710DECLARE_RWSEM(fw_device_rwsem);
711
d6053e08 712DEFINE_IDR(fw_device_idr);
a3aca3da
KH
713int fw_cdev_major;
714
96b19062 715struct fw_device *fw_device_get_by_devt(dev_t devt)
a3aca3da
KH
716{
717 struct fw_device *device;
718
c9755e14 719 down_read(&fw_device_rwsem);
a3aca3da 720 device = idr_find(&fw_device_idr, MINOR(devt));
96b19062
SR
721 if (device)
722 fw_device_get(device);
c9755e14 723 up_read(&fw_device_rwsem);
a3aca3da
KH
724
725 return device;
726}
727
3d36a0df
SR
728/*
729 * These defines control the retry behavior for reading the config
730 * rom. It shouldn't be necessary to tweak these; if the device
731 * doesn't respond to a config rom read within 10 seconds, it's not
732 * going to respond at all. As for the initial delay, a lot of
733 * devices will be able to respond within half a second after bus
734 * reset. On the other hand, it's not really worth being more
735 * aggressive than that, since it scales pretty well; if 10 devices
736 * are plugged in, they're all getting read within one second.
737 */
738
739#define MAX_RETRIES 10
740#define RETRY_DELAY (3 * HZ)
741#define INITIAL_DELAY (HZ / 2)
742#define SHUTDOWN_DELAY (2 * HZ)
743
19a15b93
KH
744static void fw_device_shutdown(struct work_struct *work)
745{
746 struct fw_device *device =
747 container_of(work, struct fw_device, work.work);
a3aca3da
KH
748 int minor = MINOR(device->device.devt);
749
e71084af
CL
750 if (time_before64(get_jiffies_64(),
751 device->card->reset_jiffies + SHUTDOWN_DELAY)
e747a5c0 752 && !list_empty(&device->card->link)) {
3d36a0df
SR
753 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
754 return;
755 }
756
757 if (atomic_cmpxchg(&device->state,
758 FW_DEVICE_GONE,
759 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
760 return;
761
2603bf21 762 fw_device_cdev_remove(device);
19a15b93
KH
763 device_for_each_child(&device->device, NULL, shutdown_unit);
764 device_unregister(&device->device);
96b19062 765
c9755e14 766 down_write(&fw_device_rwsem);
96b19062 767 idr_remove(&fw_device_idr, minor);
c9755e14 768 up_write(&fw_device_rwsem);
3d36a0df 769
96b19062 770 fw_device_put(device);
19a15b93
KH
771}
772
aed80892
SR
773static void fw_device_release(struct device *dev)
774{
775 struct fw_device *device = fw_device(dev);
776 struct fw_card *card = device->card;
777 unsigned long flags;
778
779 /*
780 * Take the card lock so we don't set this to NULL while a
781 * FW_NODE_UPDATED callback is being handled or while the
782 * bus manager work looks at this node.
783 */
784 spin_lock_irqsave(&card->lock, flags);
785 device->node->data = NULL;
786 spin_unlock_irqrestore(&card->lock, flags);
787
788 fw_node_put(device->node);
789 kfree(device->config_rom);
790 kfree(device);
791 fw_card_put(card);
792}
793
21351dbe 794static struct device_type fw_device_type = {
aed80892 795 .release = fw_device_release,
21351dbe
KH
796};
797
099d5414
SR
798static bool is_fw_device(struct device *dev)
799{
800 return dev->type == &fw_device_type;
801}
802
aed80892
SR
803static int update_unit(struct device *dev, void *data)
804{
805 struct fw_unit *unit = fw_unit(dev);
806 struct fw_driver *driver = (struct fw_driver *)dev->driver;
807
808 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
8e9394ce 809 device_lock(dev);
aed80892 810 driver->update(unit);
8e9394ce 811 device_unlock(dev);
aed80892
SR
812 }
813
814 return 0;
815}
816
817static void fw_device_update(struct work_struct *work)
818{
819 struct fw_device *device =
820 container_of(work, struct fw_device, work.work);
821
822 fw_device_cdev_update(device);
823 device_for_each_child(&device->device, NULL, update_unit);
824}
3d36a0df 825
c781c06d 826/*
3d36a0df
SR
827 * If a device was pending for deletion because its node went away but its
828 * bus info block and root directory header matches that of a newly discovered
829 * device, revive the existing fw_device.
830 * The newly allocated fw_device becomes obsolete instead.
c781c06d 831 */
3d36a0df
SR
832static int lookup_existing_device(struct device *dev, void *data)
833{
834 struct fw_device *old = fw_device(dev);
835 struct fw_device *new = data;
836 struct fw_card *card = new->card;
837 int match = 0;
838
099d5414
SR
839 if (!is_fw_device(dev))
840 return 0;
841
3d36a0df
SR
842 down_read(&fw_device_rwsem); /* serialize config_rom access */
843 spin_lock_irq(&card->lock); /* serialize node access */
844
845 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
846 atomic_cmpxchg(&old->state,
847 FW_DEVICE_GONE,
848 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
849 struct fw_node *current_node = new->node;
850 struct fw_node *obsolete_node = old->node;
851
852 new->node = obsolete_node;
853 new->node->data = new;
854 old->node = current_node;
855 old->node->data = old;
856
857 old->max_speed = new->max_speed;
858 old->node_id = current_node->node_id;
859 smp_wmb(); /* update node_id before generation */
860 old->generation = card->generation;
861 old->config_rom_retries = 0;
862 fw_notify("rediscovered device %s\n", dev_name(dev));
19a15b93 863
3d36a0df
SR
864 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
865 schedule_delayed_work(&old->work, 0);
866
867 if (current_node == card->root_node)
868 fw_schedule_bm_work(card, 0);
869
870 match = 1;
871 }
872
873 spin_unlock_irq(&card->lock);
874 up_read(&fw_device_rwsem);
875
876 return match;
877}
19a15b93 878
7889b60e
SR
879enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
880
099d5414 881static void set_broadcast_channel(struct fw_device *device, int generation)
7889b60e
SR
882{
883 struct fw_card *card = device->card;
884 __be32 data;
885 int rcode;
886
887 if (!card->broadcast_channel_allocated)
888 return;
889
837ec787
SR
890 /*
891 * The Broadcast_Channel Valid bit is required by nodes which want to
892 * transmit on this channel. Such transmissions are practically
893 * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required
894 * to be IRM capable and have a max_rec of 8 or more. We use this fact
895 * to narrow down to which nodes we send Broadcast_Channel updates.
896 */
897 if (!device->irmc || device->max_rec < 8)
898 return;
899
900 /*
901 * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
902 * Perform a read test first.
903 */
7889b60e
SR
904 if (device->bc_implemented == BC_UNKNOWN) {
905 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
906 device->node_id, generation, device->max_speed,
907 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
908 &data, 4);
909 switch (rcode) {
910 case RCODE_COMPLETE:
911 if (data & cpu_to_be32(1 << 31)) {
912 device->bc_implemented = BC_IMPLEMENTED;
913 break;
914 }
915 /* else fall through to case address error */
916 case RCODE_ADDRESS_ERROR:
917 device->bc_implemented = BC_UNIMPLEMENTED;
918 }
919 }
920
921 if (device->bc_implemented == BC_IMPLEMENTED) {
922 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
923 BROADCAST_CHANNEL_VALID);
924 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
925 device->node_id, generation, device->max_speed,
926 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
927 &data, 4);
928 }
929}
930
099d5414
SR
931int fw_device_set_broadcast_channel(struct device *dev, void *gen)
932{
933 if (is_fw_device(dev))
934 set_broadcast_channel(fw_device(dev), (long)gen);
935
936 return 0;
937}
938
19a15b93
KH
939static void fw_device_init(struct work_struct *work)
940{
19a15b93
KH
941 struct fw_device *device =
942 container_of(work, struct fw_device, work.work);
3d36a0df 943 struct device *revived_dev;
e1eff7a3 944 int minor, ret;
19a15b93 945
c781c06d
KH
946 /*
947 * All failure paths here set node->data to NULL, so that we
19a15b93 948 * don't try to do device_for_each_child() on a kfree()'d
c781c06d
KH
949 * device.
950 */
19a15b93 951
fd6e0c51 952 if (read_config_rom(device, device->generation) < 0) {
855c603d
SR
953 if (device->config_rom_retries < MAX_RETRIES &&
954 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
19a15b93
KH
955 device->config_rom_retries++;
956 schedule_delayed_work(&device->work, RETRY_DELAY);
957 } else {
115881d3
SR
958 if (device->node->link_on)
959 fw_notify("giving up on config rom for node id %x\n",
960 device->node_id);
931c4834 961 if (device->node == device->card->root_node)
0fa1986f 962 fw_schedule_bm_work(device->card, 0);
19a15b93
KH
963 fw_device_release(&device->device);
964 }
965 return;
966 }
967
3d36a0df
SR
968 revived_dev = device_find_child(device->card->device,
969 device, lookup_existing_device);
970 if (revived_dev) {
971 put_device(revived_dev);
972 fw_device_release(&device->device);
973
974 return;
975 }
976
62305823 977 device_initialize(&device->device);
96b19062
SR
978
979 fw_device_get(device);
c9755e14 980 down_write(&fw_device_rwsem);
e1eff7a3 981 ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
62305823
SR
982 idr_get_new(&fw_device_idr, device, &minor) :
983 -ENOMEM;
c9755e14 984 up_write(&fw_device_rwsem);
96b19062 985
e1eff7a3 986 if (ret < 0)
a3aca3da
KH
987 goto error;
988
19a15b93 989 device->device.bus = &fw_bus_type;
21351dbe 990 device->device.type = &fw_device_type;
19a15b93 991 device->device.parent = device->card->device;
a3aca3da 992 device->device.devt = MKDEV(fw_cdev_major, minor);
a1f64819 993 dev_set_name(&device->device, "fw%d", minor);
19a15b93 994
e5333db9
SR
995 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
996 ARRAY_SIZE(fw_device_attributes) +
997 ARRAY_SIZE(config_rom_attributes));
6f2e53d5
KH
998 init_fw_attribute_group(&device->device,
999 fw_device_attributes,
1000 &device->attribute_group);
e5333db9 1001
19a15b93
KH
1002 if (device_add(&device->device)) {
1003 fw_error("Failed to add device.\n");
a3aca3da 1004 goto error_with_cdev;
19a15b93
KH
1005 }
1006
19a15b93
KH
1007 create_units(device);
1008
c781c06d
KH
1009 /*
1010 * Transition the device to running state. If it got pulled
19a15b93
KH
1011 * out from under us while we did the intialization work, we
1012 * have to shut down the device again here. Normally, though,
1013 * fw_node_event will be responsible for shutting it down when
1014 * necessary. We have to use the atomic cmpxchg here to avoid
1015 * racing with the FW_NODE_DESTROYED case in
c781c06d
KH
1016 * fw_node_event().
1017 */
641f8791 1018 if (atomic_cmpxchg(&device->state,
3d36a0df
SR
1019 FW_DEVICE_INITIALIZING,
1020 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1021 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1022 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
fa6e697b
SR
1023 } else {
1024 if (device->config_rom_retries)
1025 fw_notify("created device %s: GUID %08x%08x, S%d00, "
1026 "%d config ROM retries\n",
a1f64819 1027 dev_name(&device->device),
fa6e697b
SR
1028 device->config_rom[3], device->config_rom[4],
1029 1 << device->max_speed,
1030 device->config_rom_retries);
1031 else
1032 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
a1f64819 1033 dev_name(&device->device),
fa6e697b
SR
1034 device->config_rom[3], device->config_rom[4],
1035 1 << device->max_speed);
c9755e14 1036 device->config_rom_retries = 0;
7889b60e 1037
099d5414 1038 set_broadcast_channel(device, device->generation);
fa6e697b 1039 }
19a15b93 1040
c781c06d
KH
1041 /*
1042 * Reschedule the IRM work if we just finished reading the
19a15b93
KH
1043 * root node config rom. If this races with a bus reset we
1044 * just end up running the IRM work a couple of extra times -
c781c06d
KH
1045 * pretty harmless.
1046 */
19a15b93 1047 if (device->node == device->card->root_node)
0fa1986f 1048 fw_schedule_bm_work(device->card, 0);
19a15b93
KH
1049
1050 return;
1051
a3aca3da 1052 error_with_cdev:
c9755e14 1053 down_write(&fw_device_rwsem);
a3aca3da 1054 idr_remove(&fw_device_idr, minor);
c9755e14 1055 up_write(&fw_device_rwsem);
373b2edd 1056 error:
96b19062
SR
1057 fw_device_put(device); /* fw_device_idr's reference */
1058
1059 put_device(&device->device); /* our reference */
19a15b93
KH
1060}
1061
c9755e14
SR
1062enum {
1063 REREAD_BIB_ERROR,
1064 REREAD_BIB_GONE,
1065 REREAD_BIB_UNCHANGED,
1066 REREAD_BIB_CHANGED,
1067};
1068
1069/* Reread and compare bus info block and header of root directory */
fd6e0c51 1070static int reread_config_rom(struct fw_device *device, int generation)
c9755e14
SR
1071{
1072 u32 q;
1073 int i;
1074
1075 for (i = 0; i < 6; i++) {
1076 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
1077 return REREAD_BIB_ERROR;
1078
1079 if (i == 0 && q == 0)
1080 return REREAD_BIB_GONE;
1081
d01b0178 1082 if (q != device->config_rom[i])
c9755e14
SR
1083 return REREAD_BIB_CHANGED;
1084 }
1085
1086 return REREAD_BIB_UNCHANGED;
1087}
1088
1089static void fw_device_refresh(struct work_struct *work)
1090{
1091 struct fw_device *device =
1092 container_of(work, struct fw_device, work.work);
1093 struct fw_card *card = device->card;
1094 int node_id = device->node_id;
1095
fd6e0c51 1096 switch (reread_config_rom(device, device->generation)) {
c9755e14
SR
1097 case REREAD_BIB_ERROR:
1098 if (device->config_rom_retries < MAX_RETRIES / 2 &&
1099 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1100 device->config_rom_retries++;
1101 schedule_delayed_work(&device->work, RETRY_DELAY / 2);
1102
1103 return;
1104 }
1105 goto give_up;
1106
1107 case REREAD_BIB_GONE:
1108 goto gone;
1109
1110 case REREAD_BIB_UNCHANGED:
1111 if (atomic_cmpxchg(&device->state,
3d36a0df
SR
1112 FW_DEVICE_INITIALIZING,
1113 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
c9755e14
SR
1114 goto gone;
1115
1116 fw_device_update(work);
1117 device->config_rom_retries = 0;
1118 goto out;
1119
1120 case REREAD_BIB_CHANGED:
1121 break;
1122 }
1123
1124 /*
1125 * Something changed. We keep things simple and don't investigate
1126 * further. We just destroy all previous units and create new ones.
1127 */
1128 device_for_each_child(&device->device, NULL, shutdown_unit);
1129
fd6e0c51 1130 if (read_config_rom(device, device->generation) < 0) {
c9755e14
SR
1131 if (device->config_rom_retries < MAX_RETRIES &&
1132 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1133 device->config_rom_retries++;
1134 schedule_delayed_work(&device->work, RETRY_DELAY);
1135
1136 return;
1137 }
1138 goto give_up;
1139 }
1140
8b4f70ba 1141 fw_device_cdev_update(device);
c9755e14
SR
1142 create_units(device);
1143
0210b66d
SR
1144 /* Userspace may want to re-read attributes. */
1145 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1146
c9755e14 1147 if (atomic_cmpxchg(&device->state,
3d36a0df
SR
1148 FW_DEVICE_INITIALIZING,
1149 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
c9755e14
SR
1150 goto gone;
1151
a1f64819 1152 fw_notify("refreshed device %s\n", dev_name(&device->device));
c9755e14
SR
1153 device->config_rom_retries = 0;
1154 goto out;
1155
1156 give_up:
a1f64819 1157 fw_notify("giving up on refresh of device %s\n", dev_name(&device->device));
c9755e14 1158 gone:
3d36a0df
SR
1159 atomic_set(&device->state, FW_DEVICE_GONE);
1160 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1161 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
c9755e14
SR
1162 out:
1163 if (node_id == card->root_node->node_id)
0fa1986f 1164 fw_schedule_bm_work(card, 0);
c9755e14
SR
1165}
1166
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KH
1167void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1168{
1169 struct fw_device *device;
1170
19a15b93
KH
1171 switch (event) {
1172 case FW_NODE_CREATED:
115881d3
SR
1173 /*
1174 * Attempt to scan the node, regardless whether its self ID has
1175 * the L (link active) flag set or not. Some broken devices
1176 * send L=0 but have an up-and-running link; others send L=1
1177 * without actually having a link.
1178 */
c9755e14 1179 create:
19a15b93
KH
1180 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1181 if (device == NULL)
1182 break;
1183
c781c06d
KH
1184 /*
1185 * Do minimal intialization of the device here, the
62305823
SR
1186 * rest will happen in fw_device_init().
1187 *
1188 * Attention: A lot of things, even fw_device_get(),
1189 * cannot be done before fw_device_init() finished!
1190 * You can basically just check device->state and
1191 * schedule work until then, but only while holding
1192 * card->lock.
c781c06d 1193 */
641f8791 1194 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
459f7923 1195 device->card = fw_card_get(card);
19a15b93
KH
1196 device->node = fw_node_get(node);
1197 device->node_id = node->node_id;
1198 device->generation = card->generation;
92368890 1199 device->is_local = node == card->local_node;
d67cfb96 1200 mutex_init(&device->client_list_mutex);
97bd9efa 1201 INIT_LIST_HEAD(&device->client_list);
19a15b93 1202
c781c06d
KH
1203 /*
1204 * Set the node data to point back to this device so
19a15b93 1205 * FW_NODE_UPDATED callbacks can update the node_id
c781c06d
KH
1206 * and generation for the device.
1207 */
19a15b93
KH
1208 node->data = device;
1209
c781c06d
KH
1210 /*
1211 * Many devices are slow to respond after bus resets,
19a15b93
KH
1212 * especially if they are bus powered and go through
1213 * power-up after getting plugged in. We schedule the
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KH
1214 * first config rom scan half a second after bus reset.
1215 */
19a15b93
KH
1216 INIT_DELAYED_WORK(&device->work, fw_device_init);
1217 schedule_delayed_work(&device->work, INITIAL_DELAY);
1218 break;
1219
c9755e14 1220 case FW_NODE_INITIATED_RESET:
115881d3 1221 case FW_NODE_LINK_ON:
c9755e14
SR
1222 device = node->data;
1223 if (device == NULL)
1224 goto create;
1225
1226 device->node_id = node->node_id;
1227 smp_wmb(); /* update node_id before generation */
1228 device->generation = card->generation;
1229 if (atomic_cmpxchg(&device->state,
1230 FW_DEVICE_RUNNING,
1231 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1232 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
1233 schedule_delayed_work(&device->work,
92368890 1234 device->is_local ? 0 : INITIAL_DELAY);
c9755e14
SR
1235 }
1236 break;
1237
19a15b93 1238 case FW_NODE_UPDATED:
115881d3
SR
1239 device = node->data;
1240 if (device == NULL)
19a15b93
KH
1241 break;
1242
19a15b93 1243 device->node_id = node->node_id;
b5d2a5e0 1244 smp_wmb(); /* update node_id before generation */
19a15b93 1245 device->generation = card->generation;
5f480477
KH
1246 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1247 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
1248 schedule_delayed_work(&device->work, 0);
1249 }
19a15b93
KH
1250 break;
1251
1252 case FW_NODE_DESTROYED:
1253 case FW_NODE_LINK_OFF:
1254 if (!node->data)
1255 break;
1256
c781c06d
KH
1257 /*
1258 * Destroy the device associated with the node. There
19a15b93
KH
1259 * are two cases here: either the device is fully
1260 * initialized (FW_DEVICE_RUNNING) or we're in the
1261 * process of reading its config rom
1262 * (FW_DEVICE_INITIALIZING). If it is fully
1263 * initialized we can reuse device->work to schedule a
1264 * full fw_device_shutdown(). If not, there's work
1265 * scheduled to read it's config rom, and we just put
1266 * the device in shutdown state to have that code fail
c781c06d
KH
1267 * to create the device.
1268 */
19a15b93 1269 device = node->data;
641f8791 1270 if (atomic_xchg(&device->state,
3d36a0df 1271 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
5f480477 1272 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
e747a5c0
SR
1273 schedule_delayed_work(&device->work,
1274 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
19a15b93
KH
1275 }
1276 break;
1277 }
1278}