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19a15b93 KH |
1 | /* -*- c-basic-offset: 8 -*- |
2 | * | |
3 | * fw-device-cdev.c - Char device for device raw access | |
4 | * | |
5 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software Foundation, | |
19 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/wait.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/poll.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/mm.h> | |
a3aca3da | 31 | #include <linux/idr.h> |
19a15b93 | 32 | #include <linux/compat.h> |
9640d3d7 | 33 | #include <linux/firewire-cdev.h> |
19a15b93 KH |
34 | #include <asm/uaccess.h> |
35 | #include "fw-transaction.h" | |
36 | #include "fw-topology.h" | |
37 | #include "fw-device.h" | |
19a15b93 | 38 | |
19a15b93 KH |
39 | /* dequeue_event() just kfree()'s the event, so the event has to be |
40 | * the first field in the struct. */ | |
41 | ||
3964a449 KH |
42 | struct client; |
43 | struct client_resource { | |
44 | struct list_head link; | |
45 | void (*release)(struct client *client, struct client_resource *r); | |
46 | u32 handle; | |
47 | }; | |
48 | ||
19a15b93 KH |
49 | struct event { |
50 | struct { void *data; size_t size; } v[2]; | |
51 | struct list_head link; | |
52 | }; | |
53 | ||
97bd9efa KH |
54 | struct bus_reset { |
55 | struct event event; | |
56 | struct fw_cdev_event_bus_reset reset; | |
57 | }; | |
58 | ||
19a15b93 KH |
59 | struct response { |
60 | struct event event; | |
61 | struct fw_transaction transaction; | |
62 | struct client *client; | |
3964a449 | 63 | struct client_resource resource; |
19a15b93 KH |
64 | struct fw_cdev_event_response response; |
65 | }; | |
66 | ||
67 | struct iso_interrupt { | |
68 | struct event event; | |
69 | struct fw_cdev_event_iso_interrupt interrupt; | |
70 | }; | |
71 | ||
72 | struct client { | |
344bbc4d | 73 | u32 version; |
19a15b93 KH |
74 | struct fw_device *device; |
75 | spinlock_t lock; | |
66dea3e5 | 76 | u32 resource_handle; |
3964a449 | 77 | struct list_head resource_list; |
19a15b93 | 78 | struct list_head event_list; |
19a15b93 | 79 | wait_queue_head_t wait; |
da8ecffa | 80 | u64 bus_reset_closure; |
9aad8125 | 81 | |
19a15b93 | 82 | struct fw_iso_context *iso_context; |
abaa5743 | 83 | u64 iso_closure; |
9aad8125 KH |
84 | struct fw_iso_buffer buffer; |
85 | unsigned long vm_start; | |
97bd9efa KH |
86 | |
87 | struct list_head link; | |
19a15b93 KH |
88 | }; |
89 | ||
90 | static inline void __user * | |
91 | u64_to_uptr(__u64 value) | |
92 | { | |
93 | return (void __user *)(unsigned long)value; | |
94 | } | |
95 | ||
96 | static inline __u64 | |
97 | uptr_to_u64(void __user *ptr) | |
98 | { | |
99 | return (__u64)(unsigned long)ptr; | |
100 | } | |
101 | ||
102 | static int fw_device_op_open(struct inode *inode, struct file *file) | |
103 | { | |
104 | struct fw_device *device; | |
105 | struct client *client; | |
97bd9efa | 106 | unsigned long flags; |
19a15b93 | 107 | |
a3aca3da KH |
108 | device = fw_device_from_devt(inode->i_rdev); |
109 | if (device == NULL) | |
110 | return -ENODEV; | |
19a15b93 KH |
111 | |
112 | client = kzalloc(sizeof *client, GFP_KERNEL); | |
113 | if (client == NULL) | |
114 | return -ENOMEM; | |
115 | ||
116 | client->device = fw_device_get(device); | |
117 | INIT_LIST_HEAD(&client->event_list); | |
3964a449 | 118 | INIT_LIST_HEAD(&client->resource_list); |
19a15b93 KH |
119 | spin_lock_init(&client->lock); |
120 | init_waitqueue_head(&client->wait); | |
121 | ||
122 | file->private_data = client; | |
123 | ||
97bd9efa KH |
124 | spin_lock_irqsave(&device->card->lock, flags); |
125 | list_add_tail(&client->link, &device->client_list); | |
126 | spin_unlock_irqrestore(&device->card->lock, flags); | |
127 | ||
19a15b93 KH |
128 | return 0; |
129 | } | |
130 | ||
131 | static void queue_event(struct client *client, struct event *event, | |
132 | void *data0, size_t size0, void *data1, size_t size1) | |
133 | { | |
134 | unsigned long flags; | |
135 | ||
136 | event->v[0].data = data0; | |
137 | event->v[0].size = size0; | |
138 | event->v[1].data = data1; | |
139 | event->v[1].size = size1; | |
140 | ||
141 | spin_lock_irqsave(&client->lock, flags); | |
142 | ||
143 | list_add_tail(&event->link, &client->event_list); | |
19a15b93 KH |
144 | wake_up_interruptible(&client->wait); |
145 | ||
146 | spin_unlock_irqrestore(&client->lock, flags); | |
147 | } | |
148 | ||
2603bf21 KH |
149 | static int |
150 | dequeue_event(struct client *client, char __user *buffer, size_t count) | |
19a15b93 KH |
151 | { |
152 | unsigned long flags; | |
153 | struct event *event; | |
154 | size_t size, total; | |
2603bf21 | 155 | int i, retval; |
19a15b93 | 156 | |
2603bf21 KH |
157 | retval = wait_event_interruptible(client->wait, |
158 | !list_empty(&client->event_list) || | |
159 | fw_device_is_shutdown(client->device)); | |
160 | if (retval < 0) | |
161 | return retval; | |
19a15b93 | 162 | |
2603bf21 KH |
163 | if (list_empty(&client->event_list) && |
164 | fw_device_is_shutdown(client->device)) | |
165 | return -ENODEV; | |
19a15b93 | 166 | |
2603bf21 | 167 | spin_lock_irqsave(&client->lock, flags); |
19a15b93 KH |
168 | event = container_of(client->event_list.next, struct event, link); |
169 | list_del(&event->link); | |
19a15b93 KH |
170 | spin_unlock_irqrestore(&client->lock, flags); |
171 | ||
19a15b93 KH |
172 | total = 0; |
173 | for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { | |
174 | size = min(event->v[i].size, count - total); | |
2603bf21 KH |
175 | if (copy_to_user(buffer + total, event->v[i].data, size)) { |
176 | retval = -EFAULT; | |
19a15b93 | 177 | goto out; |
2603bf21 | 178 | } |
19a15b93 KH |
179 | total += size; |
180 | } | |
181 | retval = total; | |
182 | ||
183 | out: | |
184 | kfree(event); | |
185 | ||
186 | return retval; | |
187 | } | |
188 | ||
189 | static ssize_t | |
190 | fw_device_op_read(struct file *file, | |
191 | char __user *buffer, size_t count, loff_t *offset) | |
192 | { | |
193 | struct client *client = file->private_data; | |
194 | ||
195 | return dequeue_event(client, buffer, count); | |
196 | } | |
197 | ||
344bbc4d KH |
198 | static void |
199 | fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, | |
da8ecffa | 200 | struct client *client) |
344bbc4d | 201 | { |
da8ecffa | 202 | struct fw_card *card = client->device->card; |
344bbc4d | 203 | |
da8ecffa | 204 | event->closure = client->bus_reset_closure; |
344bbc4d | 205 | event->type = FW_CDEV_EVENT_BUS_RESET; |
da8ecffa | 206 | event->node_id = client->device->node_id; |
344bbc4d KH |
207 | event->local_node_id = card->local_node->node_id; |
208 | event->bm_node_id = 0; /* FIXME: We don't track the BM. */ | |
209 | event->irm_node_id = card->irm_node->node_id; | |
210 | event->root_node_id = card->root_node->node_id; | |
211 | event->generation = card->generation; | |
212 | } | |
213 | ||
2603bf21 KH |
214 | static void |
215 | for_each_client(struct fw_device *device, | |
216 | void (*callback)(struct client *client)) | |
217 | { | |
218 | struct fw_card *card = device->card; | |
219 | struct client *c; | |
220 | unsigned long flags; | |
221 | ||
222 | spin_lock_irqsave(&card->lock, flags); | |
223 | ||
224 | list_for_each_entry(c, &device->client_list, link) | |
225 | callback(c); | |
226 | ||
227 | spin_unlock_irqrestore(&card->lock, flags); | |
228 | } | |
229 | ||
97bd9efa KH |
230 | static void |
231 | queue_bus_reset_event(struct client *client) | |
232 | { | |
233 | struct bus_reset *bus_reset; | |
97bd9efa KH |
234 | |
235 | bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC); | |
236 | if (bus_reset == NULL) { | |
237 | fw_notify("Out of memory when allocating bus reset event\n"); | |
238 | return; | |
239 | } | |
240 | ||
da8ecffa | 241 | fill_bus_reset_event(&bus_reset->reset, client); |
97bd9efa KH |
242 | |
243 | queue_event(client, &bus_reset->event, | |
244 | &bus_reset->reset, sizeof bus_reset->reset, NULL, 0); | |
245 | } | |
246 | ||
247 | void fw_device_cdev_update(struct fw_device *device) | |
248 | { | |
2603bf21 KH |
249 | for_each_client(device, queue_bus_reset_event); |
250 | } | |
97bd9efa | 251 | |
2603bf21 KH |
252 | static void wake_up_client(struct client *client) |
253 | { | |
254 | wake_up_interruptible(&client->wait); | |
255 | } | |
97bd9efa | 256 | |
2603bf21 KH |
257 | void fw_device_cdev_remove(struct fw_device *device) |
258 | { | |
259 | for_each_client(device, wake_up_client); | |
97bd9efa KH |
260 | } |
261 | ||
4f259223 | 262 | static int ioctl_get_info(struct client *client, void *buffer) |
19a15b93 | 263 | { |
4f259223 | 264 | struct fw_cdev_get_info *get_info = buffer; |
344bbc4d KH |
265 | struct fw_cdev_event_bus_reset bus_reset; |
266 | ||
4f259223 KH |
267 | client->version = get_info->version; |
268 | get_info->version = FW_CDEV_VERSION; | |
344bbc4d | 269 | |
4f259223 KH |
270 | if (get_info->rom != 0) { |
271 | void __user *uptr = u64_to_uptr(get_info->rom); | |
272 | size_t want = get_info->rom_length; | |
d84702a5 | 273 | size_t have = client->device->config_rom_length * 4; |
344bbc4d | 274 | |
d84702a5 SR |
275 | if (copy_to_user(uptr, client->device->config_rom, |
276 | min(want, have))) | |
344bbc4d KH |
277 | return -EFAULT; |
278 | } | |
4f259223 | 279 | get_info->rom_length = client->device->config_rom_length * 4; |
344bbc4d | 280 | |
4f259223 KH |
281 | client->bus_reset_closure = get_info->bus_reset_closure; |
282 | if (get_info->bus_reset != 0) { | |
283 | void __user *uptr = u64_to_uptr(get_info->bus_reset); | |
344bbc4d | 284 | |
da8ecffa | 285 | fill_bus_reset_event(&bus_reset, client); |
344bbc4d KH |
286 | if (copy_to_user(uptr, &bus_reset, sizeof bus_reset)) |
287 | return -EFAULT; | |
288 | } | |
19a15b93 | 289 | |
4f259223 | 290 | get_info->card = client->device->card->index; |
19a15b93 KH |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
3964a449 KH |
295 | static void |
296 | add_client_resource(struct client *client, struct client_resource *resource) | |
297 | { | |
298 | unsigned long flags; | |
299 | ||
300 | spin_lock_irqsave(&client->lock, flags); | |
301 | list_add_tail(&resource->link, &client->resource_list); | |
302 | resource->handle = client->resource_handle++; | |
303 | spin_unlock_irqrestore(&client->lock, flags); | |
304 | } | |
305 | ||
306 | static int | |
307 | release_client_resource(struct client *client, u32 handle, | |
308 | struct client_resource **resource) | |
309 | { | |
310 | struct client_resource *r; | |
311 | unsigned long flags; | |
312 | ||
313 | spin_lock_irqsave(&client->lock, flags); | |
314 | list_for_each_entry(r, &client->resource_list, link) { | |
315 | if (r->handle == handle) { | |
316 | list_del(&r->link); | |
317 | break; | |
318 | } | |
319 | } | |
320 | spin_unlock_irqrestore(&client->lock, flags); | |
321 | ||
322 | if (&r->link == &client->resource_list) | |
323 | return -EINVAL; | |
324 | ||
325 | if (resource) | |
326 | *resource = r; | |
327 | else | |
328 | r->release(client, r); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static void | |
334 | release_transaction(struct client *client, struct client_resource *resource) | |
335 | { | |
336 | struct response *response = | |
337 | container_of(resource, struct response, resource); | |
338 | ||
339 | fw_cancel_transaction(client->device->card, &response->transaction); | |
340 | } | |
341 | ||
19a15b93 KH |
342 | static void |
343 | complete_transaction(struct fw_card *card, int rcode, | |
344 | void *payload, size_t length, void *data) | |
345 | { | |
346 | struct response *response = data; | |
347 | struct client *client = response->client; | |
28cf6a04 | 348 | unsigned long flags; |
19a15b93 KH |
349 | |
350 | if (length < response->response.length) | |
351 | response->response.length = length; | |
352 | if (rcode == RCODE_COMPLETE) | |
353 | memcpy(response->response.data, payload, | |
354 | response->response.length); | |
355 | ||
28cf6a04 | 356 | spin_lock_irqsave(&client->lock, flags); |
3964a449 | 357 | list_del(&response->resource.link); |
28cf6a04 KH |
358 | spin_unlock_irqrestore(&client->lock, flags); |
359 | ||
19a15b93 KH |
360 | response->response.type = FW_CDEV_EVENT_RESPONSE; |
361 | response->response.rcode = rcode; | |
362 | queue_event(client, &response->event, | |
363 | &response->response, sizeof response->response, | |
364 | response->response.data, response->response.length); | |
365 | } | |
366 | ||
4f259223 | 367 | static ssize_t ioctl_send_request(struct client *client, void *buffer) |
19a15b93 KH |
368 | { |
369 | struct fw_device *device = client->device; | |
4f259223 | 370 | struct fw_cdev_send_request *request = buffer; |
19a15b93 KH |
371 | struct response *response; |
372 | ||
19a15b93 | 373 | /* What is the biggest size we'll accept, really? */ |
4f259223 | 374 | if (request->length > 4096) |
19a15b93 KH |
375 | return -EINVAL; |
376 | ||
4f259223 | 377 | response = kmalloc(sizeof *response + request->length, GFP_KERNEL); |
19a15b93 KH |
378 | if (response == NULL) |
379 | return -ENOMEM; | |
380 | ||
381 | response->client = client; | |
4f259223 KH |
382 | response->response.length = request->length; |
383 | response->response.closure = request->closure; | |
19a15b93 | 384 | |
4f259223 | 385 | if (request->data && |
19a15b93 | 386 | copy_from_user(response->response.data, |
4f259223 | 387 | u64_to_uptr(request->data), request->length)) { |
19a15b93 KH |
388 | kfree(response); |
389 | return -EFAULT; | |
390 | } | |
391 | ||
3964a449 KH |
392 | response->resource.release = release_transaction; |
393 | add_client_resource(client, &response->resource); | |
28cf6a04 | 394 | |
19a15b93 | 395 | fw_send_request(device->card, &response->transaction, |
4f259223 | 396 | request->tcode & 0x1f, |
907293d7 | 397 | device->node->node_id, |
4f259223 | 398 | request->generation, |
19a15b93 | 399 | device->node->max_speed, |
4f259223 KH |
400 | request->offset, |
401 | response->response.data, request->length, | |
19a15b93 KH |
402 | complete_transaction, response); |
403 | ||
4f259223 KH |
404 | if (request->data) |
405 | return sizeof request + request->length; | |
19a15b93 KH |
406 | else |
407 | return sizeof request; | |
408 | } | |
409 | ||
410 | struct address_handler { | |
411 | struct fw_address_handler handler; | |
412 | __u64 closure; | |
413 | struct client *client; | |
3964a449 | 414 | struct client_resource resource; |
19a15b93 KH |
415 | }; |
416 | ||
417 | struct request { | |
418 | struct fw_request *request; | |
419 | void *data; | |
420 | size_t length; | |
3964a449 | 421 | struct client_resource resource; |
19a15b93 KH |
422 | }; |
423 | ||
424 | struct request_event { | |
425 | struct event event; | |
426 | struct fw_cdev_event_request request; | |
427 | }; | |
428 | ||
3964a449 KH |
429 | static void |
430 | release_request(struct client *client, struct client_resource *resource) | |
431 | { | |
432 | struct request *request = | |
433 | container_of(resource, struct request, resource); | |
434 | ||
435 | fw_send_response(client->device->card, request->request, | |
436 | RCODE_CONFLICT_ERROR); | |
437 | kfree(request); | |
438 | } | |
439 | ||
19a15b93 KH |
440 | static void |
441 | handle_request(struct fw_card *card, struct fw_request *r, | |
442 | int tcode, int destination, int source, | |
443 | int generation, int speed, | |
444 | unsigned long long offset, | |
445 | void *payload, size_t length, void *callback_data) | |
446 | { | |
447 | struct address_handler *handler = callback_data; | |
448 | struct request *request; | |
449 | struct request_event *e; | |
19a15b93 KH |
450 | struct client *client = handler->client; |
451 | ||
452 | request = kmalloc(sizeof *request, GFP_ATOMIC); | |
453 | e = kmalloc(sizeof *e, GFP_ATOMIC); | |
454 | if (request == NULL || e == NULL) { | |
455 | kfree(request); | |
456 | kfree(e); | |
457 | fw_send_response(card, r, RCODE_CONFLICT_ERROR); | |
458 | return; | |
459 | } | |
460 | ||
461 | request->request = r; | |
462 | request->data = payload; | |
463 | request->length = length; | |
464 | ||
3964a449 KH |
465 | request->resource.release = release_request; |
466 | add_client_resource(client, &request->resource); | |
19a15b93 KH |
467 | |
468 | e->request.type = FW_CDEV_EVENT_REQUEST; | |
469 | e->request.tcode = tcode; | |
470 | e->request.offset = offset; | |
471 | e->request.length = length; | |
3964a449 | 472 | e->request.handle = request->resource.handle; |
19a15b93 KH |
473 | e->request.closure = handler->closure; |
474 | ||
475 | queue_event(client, &e->event, | |
476 | &e->request, sizeof e->request, payload, length); | |
477 | } | |
478 | ||
3964a449 KH |
479 | static void |
480 | release_address_handler(struct client *client, | |
481 | struct client_resource *resource) | |
482 | { | |
483 | struct address_handler *handler = | |
484 | container_of(resource, struct address_handler, resource); | |
485 | ||
486 | fw_core_remove_address_handler(&handler->handler); | |
487 | kfree(handler); | |
488 | } | |
489 | ||
4f259223 | 490 | static int ioctl_allocate(struct client *client, void *buffer) |
19a15b93 | 491 | { |
4f259223 | 492 | struct fw_cdev_allocate *request = buffer; |
19a15b93 | 493 | struct address_handler *handler; |
19a15b93 KH |
494 | struct fw_address_region region; |
495 | ||
19a15b93 KH |
496 | handler = kmalloc(sizeof *handler, GFP_KERNEL); |
497 | if (handler == NULL) | |
498 | return -ENOMEM; | |
499 | ||
4f259223 KH |
500 | region.start = request->offset; |
501 | region.end = request->offset + request->length; | |
502 | handler->handler.length = request->length; | |
19a15b93 KH |
503 | handler->handler.address_callback = handle_request; |
504 | handler->handler.callback_data = handler; | |
4f259223 | 505 | handler->closure = request->closure; |
19a15b93 KH |
506 | handler->client = client; |
507 | ||
508 | if (fw_core_add_address_handler(&handler->handler, ®ion) < 0) { | |
509 | kfree(handler); | |
510 | return -EBUSY; | |
511 | } | |
512 | ||
3964a449 KH |
513 | handler->resource.release = release_address_handler; |
514 | add_client_resource(client, &handler->resource); | |
4f259223 | 515 | request->handle = handler->resource.handle; |
19a15b93 KH |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
4f259223 | 520 | static int ioctl_deallocate(struct client *client, void *buffer) |
9472316b | 521 | { |
4f259223 | 522 | struct fw_cdev_deallocate *request = buffer; |
9472316b | 523 | |
4f259223 | 524 | return release_client_resource(client, request->handle, NULL); |
9472316b KH |
525 | } |
526 | ||
4f259223 | 527 | static int ioctl_send_response(struct client *client, void *buffer) |
19a15b93 | 528 | { |
4f259223 | 529 | struct fw_cdev_send_response *request = buffer; |
3964a449 | 530 | struct client_resource *resource; |
19a15b93 | 531 | struct request *r; |
19a15b93 | 532 | |
4f259223 | 533 | if (release_client_resource(client, request->handle, &resource) < 0) |
19a15b93 | 534 | return -EINVAL; |
3964a449 | 535 | r = container_of(resource, struct request, resource); |
4f259223 KH |
536 | if (request->length < r->length) |
537 | r->length = request->length; | |
538 | if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) | |
19a15b93 KH |
539 | return -EFAULT; |
540 | ||
4f259223 | 541 | fw_send_response(client->device->card, r->request, request->rcode); |
19a15b93 KH |
542 | kfree(r); |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
4f259223 | 547 | static int ioctl_initiate_bus_reset(struct client *client, void *buffer) |
5371842b | 548 | { |
4f259223 | 549 | struct fw_cdev_initiate_bus_reset *request = buffer; |
5371842b KH |
550 | int short_reset; |
551 | ||
4f259223 | 552 | short_reset = (request->type == FW_CDEV_SHORT_RESET); |
5371842b KH |
553 | |
554 | return fw_core_initiate_bus_reset(client->device->card, short_reset); | |
555 | } | |
556 | ||
66dea3e5 KH |
557 | struct descriptor { |
558 | struct fw_descriptor d; | |
3964a449 | 559 | struct client_resource resource; |
66dea3e5 KH |
560 | u32 data[0]; |
561 | }; | |
562 | ||
3964a449 KH |
563 | static void release_descriptor(struct client *client, |
564 | struct client_resource *resource) | |
565 | { | |
566 | struct descriptor *descriptor = | |
567 | container_of(resource, struct descriptor, resource); | |
568 | ||
569 | fw_core_remove_descriptor(&descriptor->d); | |
570 | kfree(descriptor); | |
571 | } | |
572 | ||
4f259223 | 573 | static int ioctl_add_descriptor(struct client *client, void *buffer) |
66dea3e5 | 574 | { |
4f259223 | 575 | struct fw_cdev_add_descriptor *request = buffer; |
66dea3e5 | 576 | struct descriptor *descriptor; |
66dea3e5 KH |
577 | int retval; |
578 | ||
4f259223 | 579 | if (request->length > 256) |
66dea3e5 KH |
580 | return -EINVAL; |
581 | ||
582 | descriptor = | |
4f259223 | 583 | kmalloc(sizeof *descriptor + request->length * 4, GFP_KERNEL); |
66dea3e5 KH |
584 | if (descriptor == NULL) |
585 | return -ENOMEM; | |
586 | ||
587 | if (copy_from_user(descriptor->data, | |
4f259223 | 588 | u64_to_uptr(request->data), request->length * 4)) { |
66dea3e5 KH |
589 | kfree(descriptor); |
590 | return -EFAULT; | |
591 | } | |
592 | ||
4f259223 KH |
593 | descriptor->d.length = request->length; |
594 | descriptor->d.immediate = request->immediate; | |
595 | descriptor->d.key = request->key; | |
66dea3e5 KH |
596 | descriptor->d.data = descriptor->data; |
597 | ||
598 | retval = fw_core_add_descriptor(&descriptor->d); | |
599 | if (retval < 0) { | |
600 | kfree(descriptor); | |
601 | return retval; | |
602 | } | |
603 | ||
3964a449 KH |
604 | descriptor->resource.release = release_descriptor; |
605 | add_client_resource(client, &descriptor->resource); | |
4f259223 | 606 | request->handle = descriptor->resource.handle; |
66dea3e5 KH |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
4f259223 | 611 | static int ioctl_remove_descriptor(struct client *client, void *buffer) |
66dea3e5 | 612 | { |
4f259223 | 613 | struct fw_cdev_remove_descriptor *request = buffer; |
66dea3e5 | 614 | |
4f259223 | 615 | return release_client_resource(client, request->handle, NULL); |
66dea3e5 KH |
616 | } |
617 | ||
19a15b93 | 618 | static void |
9b32d5f3 KH |
619 | iso_callback(struct fw_iso_context *context, u32 cycle, |
620 | size_t header_length, void *header, void *data) | |
19a15b93 KH |
621 | { |
622 | struct client *client = data; | |
623 | struct iso_interrupt *interrupt; | |
624 | ||
9b32d5f3 | 625 | interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC); |
19a15b93 KH |
626 | if (interrupt == NULL) |
627 | return; | |
628 | ||
629 | interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; | |
abaa5743 | 630 | interrupt->interrupt.closure = client->iso_closure; |
19a15b93 | 631 | interrupt->interrupt.cycle = cycle; |
9b32d5f3 KH |
632 | interrupt->interrupt.header_length = header_length; |
633 | memcpy(interrupt->interrupt.header, header, header_length); | |
19a15b93 | 634 | queue_event(client, &interrupt->event, |
9b32d5f3 KH |
635 | &interrupt->interrupt, |
636 | sizeof interrupt->interrupt + header_length, NULL, 0); | |
19a15b93 KH |
637 | } |
638 | ||
4f259223 | 639 | static int ioctl_create_iso_context(struct client *client, void *buffer) |
19a15b93 | 640 | { |
4f259223 | 641 | struct fw_cdev_create_iso_context *request = buffer; |
19a15b93 | 642 | |
4f259223 | 643 | if (request->channel > 63) |
21efb3cf KH |
644 | return -EINVAL; |
645 | ||
4f259223 | 646 | switch (request->type) { |
c70dc788 | 647 | case FW_ISO_CONTEXT_RECEIVE: |
4f259223 | 648 | if (request->header_size < 4 || (request->header_size & 3)) |
c70dc788 | 649 | return -EINVAL; |
98b6cbe8 | 650 | |
c70dc788 KH |
651 | break; |
652 | ||
653 | case FW_ISO_CONTEXT_TRANSMIT: | |
4f259223 | 654 | if (request->speed > SCODE_3200) |
c70dc788 KH |
655 | return -EINVAL; |
656 | ||
657 | break; | |
658 | ||
659 | default: | |
21efb3cf | 660 | return -EINVAL; |
c70dc788 KH |
661 | } |
662 | ||
abaa5743 | 663 | client->iso_closure = request->closure; |
19a15b93 | 664 | client->iso_context = fw_iso_context_create(client->device->card, |
4f259223 KH |
665 | request->type, |
666 | request->channel, | |
667 | request->speed, | |
668 | request->header_size, | |
19a15b93 KH |
669 | iso_callback, client); |
670 | if (IS_ERR(client->iso_context)) | |
671 | return PTR_ERR(client->iso_context); | |
672 | ||
abaa5743 KH |
673 | /* We only support one context at this time. */ |
674 | request->handle = 0; | |
675 | ||
19a15b93 KH |
676 | return 0; |
677 | } | |
678 | ||
4f259223 | 679 | static int ioctl_queue_iso(struct client *client, void *buffer) |
19a15b93 | 680 | { |
4f259223 | 681 | struct fw_cdev_queue_iso *request = buffer; |
19a15b93 | 682 | struct fw_cdev_iso_packet __user *p, *end, *next; |
9b32d5f3 | 683 | struct fw_iso_context *ctx = client->iso_context; |
ef370ee7 | 684 | unsigned long payload, buffer_end, header_length; |
19a15b93 KH |
685 | int count; |
686 | struct { | |
687 | struct fw_iso_packet packet; | |
688 | u8 header[256]; | |
689 | } u; | |
690 | ||
abaa5743 | 691 | if (ctx == NULL || request->handle != 0) |
19a15b93 | 692 | return -EINVAL; |
19a15b93 KH |
693 | |
694 | /* If the user passes a non-NULL data pointer, has mmap()'ed | |
695 | * the iso buffer, and the pointer points inside the buffer, | |
696 | * we setup the payload pointers accordingly. Otherwise we | |
9aad8125 | 697 | * set them both to 0, which will still let packets with |
19a15b93 KH |
698 | * payload_length == 0 through. In other words, if no packets |
699 | * use the indirect payload, the iso buffer need not be mapped | |
4f259223 | 700 | * and the request->data pointer is ignored.*/ |
19a15b93 | 701 | |
4f259223 | 702 | payload = (unsigned long)request->data - client->vm_start; |
ef370ee7 | 703 | buffer_end = client->buffer.page_count << PAGE_SHIFT; |
4f259223 | 704 | if (request->data == 0 || client->buffer.pages == NULL || |
ef370ee7 | 705 | payload >= buffer_end) { |
9aad8125 | 706 | payload = 0; |
ef370ee7 | 707 | buffer_end = 0; |
19a15b93 KH |
708 | } |
709 | ||
4f259223 | 710 | if (!access_ok(VERIFY_READ, request->packets, request->size)) |
19a15b93 KH |
711 | return -EFAULT; |
712 | ||
4f259223 KH |
713 | p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets); |
714 | end = (void __user *)p + request->size; | |
19a15b93 KH |
715 | count = 0; |
716 | while (p < end) { | |
717 | if (__copy_from_user(&u.packet, p, sizeof *p)) | |
718 | return -EFAULT; | |
295e3feb | 719 | |
9b32d5f3 | 720 | if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) { |
295e3feb KH |
721 | header_length = u.packet.header_length; |
722 | } else { | |
723 | /* We require that header_length is a multiple of | |
724 | * the fixed header size, ctx->header_size */ | |
9b32d5f3 KH |
725 | if (ctx->header_size == 0) { |
726 | if (u.packet.header_length > 0) | |
727 | return -EINVAL; | |
728 | } else if (u.packet.header_length % ctx->header_size != 0) { | |
295e3feb | 729 | return -EINVAL; |
9b32d5f3 | 730 | } |
295e3feb KH |
731 | header_length = 0; |
732 | } | |
733 | ||
19a15b93 | 734 | next = (struct fw_cdev_iso_packet __user *) |
295e3feb | 735 | &p->header[header_length / 4]; |
19a15b93 KH |
736 | if (next > end) |
737 | return -EINVAL; | |
738 | if (__copy_from_user | |
295e3feb | 739 | (u.packet.header, p->header, header_length)) |
19a15b93 | 740 | return -EFAULT; |
98b6cbe8 | 741 | if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && |
19a15b93 KH |
742 | u.packet.header_length + u.packet.payload_length > 0) |
743 | return -EINVAL; | |
ef370ee7 | 744 | if (payload + u.packet.payload_length > buffer_end) |
19a15b93 KH |
745 | return -EINVAL; |
746 | ||
9b32d5f3 KH |
747 | if (fw_iso_context_queue(ctx, &u.packet, |
748 | &client->buffer, payload)) | |
19a15b93 KH |
749 | break; |
750 | ||
751 | p = next; | |
752 | payload += u.packet.payload_length; | |
753 | count++; | |
754 | } | |
755 | ||
4f259223 KH |
756 | request->size -= uptr_to_u64(p) - request->packets; |
757 | request->packets = uptr_to_u64(p); | |
758 | request->data = client->vm_start + payload; | |
19a15b93 KH |
759 | |
760 | return count; | |
761 | } | |
762 | ||
4f259223 | 763 | static int ioctl_start_iso(struct client *client, void *buffer) |
19a15b93 | 764 | { |
4f259223 | 765 | struct fw_cdev_start_iso *request = buffer; |
19a15b93 | 766 | |
abaa5743 KH |
767 | if (request->handle != 0) |
768 | return -EINVAL; | |
eb0306ea | 769 | if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) { |
4f259223 | 770 | if (request->tags == 0 || request->tags > 15) |
eb0306ea KH |
771 | return -EINVAL; |
772 | ||
4f259223 | 773 | if (request->sync > 15) |
eb0306ea KH |
774 | return -EINVAL; |
775 | } | |
776 | ||
4f259223 KH |
777 | return fw_iso_context_start(client->iso_context, request->cycle, |
778 | request->sync, request->tags); | |
19a15b93 KH |
779 | } |
780 | ||
4f259223 | 781 | static int ioctl_stop_iso(struct client *client, void *buffer) |
b8295668 | 782 | { |
abaa5743 KH |
783 | struct fw_cdev_stop_iso *request = buffer; |
784 | ||
785 | if (request->handle != 0) | |
786 | return -EINVAL; | |
787 | ||
b8295668 KH |
788 | return fw_iso_context_stop(client->iso_context); |
789 | } | |
790 | ||
4f259223 KH |
791 | static int (* const ioctl_handlers[])(struct client *client, void *buffer) = { |
792 | ioctl_get_info, | |
793 | ioctl_send_request, | |
794 | ioctl_allocate, | |
795 | ioctl_deallocate, | |
796 | ioctl_send_response, | |
797 | ioctl_initiate_bus_reset, | |
798 | ioctl_add_descriptor, | |
799 | ioctl_remove_descriptor, | |
800 | ioctl_create_iso_context, | |
801 | ioctl_queue_iso, | |
802 | ioctl_start_iso, | |
803 | ioctl_stop_iso, | |
804 | }; | |
805 | ||
19a15b93 KH |
806 | static int |
807 | dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) | |
808 | { | |
4f259223 KH |
809 | char buffer[256]; |
810 | int retval; | |
811 | ||
812 | if (_IOC_TYPE(cmd) != '#' || | |
813 | _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers)) | |
19a15b93 | 814 | return -EINVAL; |
4f259223 KH |
815 | |
816 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
817 | if (_IOC_SIZE(cmd) > sizeof buffer || | |
818 | copy_from_user(buffer, arg, _IOC_SIZE(cmd))) | |
819 | return -EFAULT; | |
820 | } | |
821 | ||
822 | retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer); | |
823 | if (retval < 0) | |
824 | return retval; | |
825 | ||
826 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
827 | if (_IOC_SIZE(cmd) > sizeof buffer || | |
828 | copy_to_user(arg, buffer, _IOC_SIZE(cmd))) | |
829 | return -EFAULT; | |
19a15b93 | 830 | } |
4f259223 KH |
831 | |
832 | return 0; | |
19a15b93 KH |
833 | } |
834 | ||
835 | static long | |
836 | fw_device_op_ioctl(struct file *file, | |
837 | unsigned int cmd, unsigned long arg) | |
838 | { | |
839 | struct client *client = file->private_data; | |
840 | ||
841 | return dispatch_ioctl(client, cmd, (void __user *) arg); | |
842 | } | |
843 | ||
844 | #ifdef CONFIG_COMPAT | |
845 | static long | |
846 | fw_device_op_compat_ioctl(struct file *file, | |
847 | unsigned int cmd, unsigned long arg) | |
848 | { | |
849 | struct client *client = file->private_data; | |
850 | ||
851 | return dispatch_ioctl(client, cmd, compat_ptr(arg)); | |
852 | } | |
853 | #endif | |
854 | ||
855 | static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) | |
856 | { | |
857 | struct client *client = file->private_data; | |
9aad8125 KH |
858 | enum dma_data_direction direction; |
859 | unsigned long size; | |
860 | int page_count, retval; | |
861 | ||
862 | /* FIXME: We could support multiple buffers, but we don't. */ | |
863 | if (client->buffer.pages != NULL) | |
864 | return -EBUSY; | |
865 | ||
866 | if (!(vma->vm_flags & VM_SHARED)) | |
867 | return -EINVAL; | |
19a15b93 | 868 | |
9aad8125 | 869 | if (vma->vm_start & ~PAGE_MASK) |
19a15b93 KH |
870 | return -EINVAL; |
871 | ||
872 | client->vm_start = vma->vm_start; | |
9aad8125 KH |
873 | size = vma->vm_end - vma->vm_start; |
874 | page_count = size >> PAGE_SHIFT; | |
875 | if (size & ~PAGE_MASK) | |
876 | return -EINVAL; | |
877 | ||
878 | if (vma->vm_flags & VM_WRITE) | |
879 | direction = DMA_TO_DEVICE; | |
880 | else | |
881 | direction = DMA_FROM_DEVICE; | |
882 | ||
883 | retval = fw_iso_buffer_init(&client->buffer, client->device->card, | |
884 | page_count, direction); | |
885 | if (retval < 0) | |
886 | return retval; | |
19a15b93 | 887 | |
9aad8125 KH |
888 | retval = fw_iso_buffer_map(&client->buffer, vma); |
889 | if (retval < 0) | |
890 | fw_iso_buffer_destroy(&client->buffer, client->device->card); | |
891 | ||
892 | return retval; | |
19a15b93 KH |
893 | } |
894 | ||
895 | static int fw_device_op_release(struct inode *inode, struct file *file) | |
896 | { | |
897 | struct client *client = file->private_data; | |
2603bf21 | 898 | struct event *e, *next_e; |
3964a449 | 899 | struct client_resource *r, *next_r; |
97bd9efa | 900 | unsigned long flags; |
19a15b93 | 901 | |
9aad8125 KH |
902 | if (client->buffer.pages) |
903 | fw_iso_buffer_destroy(&client->buffer, client->device->card); | |
904 | ||
19a15b93 KH |
905 | if (client->iso_context) |
906 | fw_iso_context_destroy(client->iso_context); | |
907 | ||
3964a449 KH |
908 | list_for_each_entry_safe(r, next_r, &client->resource_list, link) |
909 | r->release(client, r); | |
66dea3e5 | 910 | |
28cf6a04 KH |
911 | /* FIXME: We should wait for the async tasklets to stop |
912 | * running before freeing the memory. */ | |
913 | ||
2603bf21 KH |
914 | list_for_each_entry_safe(e, next_e, &client->event_list, link) |
915 | kfree(e); | |
19a15b93 | 916 | |
97bd9efa KH |
917 | spin_lock_irqsave(&client->device->card->lock, flags); |
918 | list_del(&client->link); | |
919 | spin_unlock_irqrestore(&client->device->card->lock, flags); | |
920 | ||
19a15b93 KH |
921 | fw_device_put(client->device); |
922 | kfree(client); | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
927 | static unsigned int fw_device_op_poll(struct file *file, poll_table * pt) | |
928 | { | |
929 | struct client *client = file->private_data; | |
2603bf21 | 930 | unsigned int mask = 0; |
19a15b93 KH |
931 | |
932 | poll_wait(file, &client->wait, pt); | |
933 | ||
2603bf21 KH |
934 | if (fw_device_is_shutdown(client->device)) |
935 | mask |= POLLHUP | POLLERR; | |
19a15b93 | 936 | if (!list_empty(&client->event_list)) |
2603bf21 KH |
937 | mask |= POLLIN | POLLRDNORM; |
938 | ||
939 | return mask; | |
19a15b93 KH |
940 | } |
941 | ||
21ebcd12 | 942 | const struct file_operations fw_device_ops = { |
19a15b93 KH |
943 | .owner = THIS_MODULE, |
944 | .open = fw_device_op_open, | |
945 | .read = fw_device_op_read, | |
946 | .unlocked_ioctl = fw_device_op_ioctl, | |
947 | .poll = fw_device_op_poll, | |
948 | .release = fw_device_op_release, | |
949 | .mmap = fw_device_op_mmap, | |
950 | ||
951 | #ifdef CONFIG_COMPAT | |
5af4e5ea | 952 | .compat_ioctl = fw_device_op_compat_ioctl, |
19a15b93 KH |
953 | #endif |
954 | }; |