| 1 | /* |
| 2 | * Char device for device raw access |
| 3 | * |
| 4 | * Copyright (C) 2005-2007 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 | |
| 21 | #include <linux/bug.h> |
| 22 | #include <linux/compat.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/dma-mapping.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/firewire.h> |
| 28 | #include <linux/firewire-cdev.h> |
| 29 | #include <linux/idr.h> |
| 30 | #include <linux/irqflags.h> |
| 31 | #include <linux/jiffies.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/kref.h> |
| 34 | #include <linux/mm.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/mutex.h> |
| 37 | #include <linux/poll.h> |
| 38 | #include <linux/sched.h> /* required for linux/wait.h */ |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/spinlock.h> |
| 41 | #include <linux/string.h> |
| 42 | #include <linux/time.h> |
| 43 | #include <linux/uaccess.h> |
| 44 | #include <linux/vmalloc.h> |
| 45 | #include <linux/wait.h> |
| 46 | #include <linux/workqueue.h> |
| 47 | |
| 48 | |
| 49 | #include "core.h" |
| 50 | |
| 51 | /* |
| 52 | * ABI version history is documented in linux/firewire-cdev.h. |
| 53 | */ |
| 54 | #define FW_CDEV_KERNEL_VERSION 5 |
| 55 | #define FW_CDEV_VERSION_EVENT_REQUEST2 4 |
| 56 | #define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 |
| 57 | #define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5 |
| 58 | |
| 59 | struct client { |
| 60 | u32 version; |
| 61 | struct fw_device *device; |
| 62 | |
| 63 | spinlock_t lock; |
| 64 | bool in_shutdown; |
| 65 | struct idr resource_idr; |
| 66 | struct list_head event_list; |
| 67 | wait_queue_head_t wait; |
| 68 | wait_queue_head_t tx_flush_wait; |
| 69 | u64 bus_reset_closure; |
| 70 | |
| 71 | struct fw_iso_context *iso_context; |
| 72 | u64 iso_closure; |
| 73 | struct fw_iso_buffer buffer; |
| 74 | unsigned long vm_start; |
| 75 | bool buffer_is_mapped; |
| 76 | |
| 77 | struct list_head phy_receiver_link; |
| 78 | u64 phy_receiver_closure; |
| 79 | |
| 80 | struct list_head link; |
| 81 | struct kref kref; |
| 82 | }; |
| 83 | |
| 84 | static inline void client_get(struct client *client) |
| 85 | { |
| 86 | kref_get(&client->kref); |
| 87 | } |
| 88 | |
| 89 | static void client_release(struct kref *kref) |
| 90 | { |
| 91 | struct client *client = container_of(kref, struct client, kref); |
| 92 | |
| 93 | fw_device_put(client->device); |
| 94 | kfree(client); |
| 95 | } |
| 96 | |
| 97 | static void client_put(struct client *client) |
| 98 | { |
| 99 | kref_put(&client->kref, client_release); |
| 100 | } |
| 101 | |
| 102 | struct client_resource; |
| 103 | typedef void (*client_resource_release_fn_t)(struct client *, |
| 104 | struct client_resource *); |
| 105 | struct client_resource { |
| 106 | client_resource_release_fn_t release; |
| 107 | int handle; |
| 108 | }; |
| 109 | |
| 110 | struct address_handler_resource { |
| 111 | struct client_resource resource; |
| 112 | struct fw_address_handler handler; |
| 113 | __u64 closure; |
| 114 | struct client *client; |
| 115 | }; |
| 116 | |
| 117 | struct outbound_transaction_resource { |
| 118 | struct client_resource resource; |
| 119 | struct fw_transaction transaction; |
| 120 | }; |
| 121 | |
| 122 | struct inbound_transaction_resource { |
| 123 | struct client_resource resource; |
| 124 | struct fw_card *card; |
| 125 | struct fw_request *request; |
| 126 | void *data; |
| 127 | size_t length; |
| 128 | }; |
| 129 | |
| 130 | struct descriptor_resource { |
| 131 | struct client_resource resource; |
| 132 | struct fw_descriptor descriptor; |
| 133 | u32 data[0]; |
| 134 | }; |
| 135 | |
| 136 | struct iso_resource { |
| 137 | struct client_resource resource; |
| 138 | struct client *client; |
| 139 | /* Schedule work and access todo only with client->lock held. */ |
| 140 | struct delayed_work work; |
| 141 | enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC, |
| 142 | ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo; |
| 143 | int generation; |
| 144 | u64 channels; |
| 145 | s32 bandwidth; |
| 146 | struct iso_resource_event *e_alloc, *e_dealloc; |
| 147 | }; |
| 148 | |
| 149 | static void release_iso_resource(struct client *, struct client_resource *); |
| 150 | |
| 151 | static void schedule_iso_resource(struct iso_resource *r, unsigned long delay) |
| 152 | { |
| 153 | client_get(r->client); |
| 154 | if (!queue_delayed_work(fw_workqueue, &r->work, delay)) |
| 155 | client_put(r->client); |
| 156 | } |
| 157 | |
| 158 | static void schedule_if_iso_resource(struct client_resource *resource) |
| 159 | { |
| 160 | if (resource->release == release_iso_resource) |
| 161 | schedule_iso_resource(container_of(resource, |
| 162 | struct iso_resource, resource), 0); |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * dequeue_event() just kfree()'s the event, so the event has to be |
| 167 | * the first field in a struct XYZ_event. |
| 168 | */ |
| 169 | struct event { |
| 170 | struct { void *data; size_t size; } v[2]; |
| 171 | struct list_head link; |
| 172 | }; |
| 173 | |
| 174 | struct bus_reset_event { |
| 175 | struct event event; |
| 176 | struct fw_cdev_event_bus_reset reset; |
| 177 | }; |
| 178 | |
| 179 | struct outbound_transaction_event { |
| 180 | struct event event; |
| 181 | struct client *client; |
| 182 | struct outbound_transaction_resource r; |
| 183 | struct fw_cdev_event_response response; |
| 184 | }; |
| 185 | |
| 186 | struct inbound_transaction_event { |
| 187 | struct event event; |
| 188 | union { |
| 189 | struct fw_cdev_event_request request; |
| 190 | struct fw_cdev_event_request2 request2; |
| 191 | } req; |
| 192 | }; |
| 193 | |
| 194 | struct iso_interrupt_event { |
| 195 | struct event event; |
| 196 | struct fw_cdev_event_iso_interrupt interrupt; |
| 197 | }; |
| 198 | |
| 199 | struct iso_interrupt_mc_event { |
| 200 | struct event event; |
| 201 | struct fw_cdev_event_iso_interrupt_mc interrupt; |
| 202 | }; |
| 203 | |
| 204 | struct iso_resource_event { |
| 205 | struct event event; |
| 206 | struct fw_cdev_event_iso_resource iso_resource; |
| 207 | }; |
| 208 | |
| 209 | struct outbound_phy_packet_event { |
| 210 | struct event event; |
| 211 | struct client *client; |
| 212 | struct fw_packet p; |
| 213 | struct fw_cdev_event_phy_packet phy_packet; |
| 214 | }; |
| 215 | |
| 216 | struct inbound_phy_packet_event { |
| 217 | struct event event; |
| 218 | struct fw_cdev_event_phy_packet phy_packet; |
| 219 | }; |
| 220 | |
| 221 | #ifdef CONFIG_COMPAT |
| 222 | static void __user *u64_to_uptr(u64 value) |
| 223 | { |
| 224 | if (is_compat_task()) |
| 225 | return compat_ptr(value); |
| 226 | else |
| 227 | return (void __user *)(unsigned long)value; |
| 228 | } |
| 229 | |
| 230 | static u64 uptr_to_u64(void __user *ptr) |
| 231 | { |
| 232 | if (is_compat_task()) |
| 233 | return ptr_to_compat(ptr); |
| 234 | else |
| 235 | return (u64)(unsigned long)ptr; |
| 236 | } |
| 237 | #else |
| 238 | static inline void __user *u64_to_uptr(u64 value) |
| 239 | { |
| 240 | return (void __user *)(unsigned long)value; |
| 241 | } |
| 242 | |
| 243 | static inline u64 uptr_to_u64(void __user *ptr) |
| 244 | { |
| 245 | return (u64)(unsigned long)ptr; |
| 246 | } |
| 247 | #endif /* CONFIG_COMPAT */ |
| 248 | |
| 249 | static int fw_device_op_open(struct inode *inode, struct file *file) |
| 250 | { |
| 251 | struct fw_device *device; |
| 252 | struct client *client; |
| 253 | |
| 254 | device = fw_device_get_by_devt(inode->i_rdev); |
| 255 | if (device == NULL) |
| 256 | return -ENODEV; |
| 257 | |
| 258 | if (fw_device_is_shutdown(device)) { |
| 259 | fw_device_put(device); |
| 260 | return -ENODEV; |
| 261 | } |
| 262 | |
| 263 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
| 264 | if (client == NULL) { |
| 265 | fw_device_put(device); |
| 266 | return -ENOMEM; |
| 267 | } |
| 268 | |
| 269 | client->device = device; |
| 270 | spin_lock_init(&client->lock); |
| 271 | idr_init(&client->resource_idr); |
| 272 | INIT_LIST_HEAD(&client->event_list); |
| 273 | init_waitqueue_head(&client->wait); |
| 274 | init_waitqueue_head(&client->tx_flush_wait); |
| 275 | INIT_LIST_HEAD(&client->phy_receiver_link); |
| 276 | INIT_LIST_HEAD(&client->link); |
| 277 | kref_init(&client->kref); |
| 278 | |
| 279 | file->private_data = client; |
| 280 | |
| 281 | return nonseekable_open(inode, file); |
| 282 | } |
| 283 | |
| 284 | static void queue_event(struct client *client, struct event *event, |
| 285 | void *data0, size_t size0, void *data1, size_t size1) |
| 286 | { |
| 287 | unsigned long flags; |
| 288 | |
| 289 | event->v[0].data = data0; |
| 290 | event->v[0].size = size0; |
| 291 | event->v[1].data = data1; |
| 292 | event->v[1].size = size1; |
| 293 | |
| 294 | spin_lock_irqsave(&client->lock, flags); |
| 295 | if (client->in_shutdown) |
| 296 | kfree(event); |
| 297 | else |
| 298 | list_add_tail(&event->link, &client->event_list); |
| 299 | spin_unlock_irqrestore(&client->lock, flags); |
| 300 | |
| 301 | wake_up_interruptible(&client->wait); |
| 302 | } |
| 303 | |
| 304 | static int dequeue_event(struct client *client, |
| 305 | char __user *buffer, size_t count) |
| 306 | { |
| 307 | struct event *event; |
| 308 | size_t size, total; |
| 309 | int i, ret; |
| 310 | |
| 311 | ret = wait_event_interruptible(client->wait, |
| 312 | !list_empty(&client->event_list) || |
| 313 | fw_device_is_shutdown(client->device)); |
| 314 | if (ret < 0) |
| 315 | return ret; |
| 316 | |
| 317 | if (list_empty(&client->event_list) && |
| 318 | fw_device_is_shutdown(client->device)) |
| 319 | return -ENODEV; |
| 320 | |
| 321 | spin_lock_irq(&client->lock); |
| 322 | event = list_first_entry(&client->event_list, struct event, link); |
| 323 | list_del(&event->link); |
| 324 | spin_unlock_irq(&client->lock); |
| 325 | |
| 326 | total = 0; |
| 327 | for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { |
| 328 | size = min(event->v[i].size, count - total); |
| 329 | if (copy_to_user(buffer + total, event->v[i].data, size)) { |
| 330 | ret = -EFAULT; |
| 331 | goto out; |
| 332 | } |
| 333 | total += size; |
| 334 | } |
| 335 | ret = total; |
| 336 | |
| 337 | out: |
| 338 | kfree(event); |
| 339 | |
| 340 | return ret; |
| 341 | } |
| 342 | |
| 343 | static ssize_t fw_device_op_read(struct file *file, char __user *buffer, |
| 344 | size_t count, loff_t *offset) |
| 345 | { |
| 346 | struct client *client = file->private_data; |
| 347 | |
| 348 | return dequeue_event(client, buffer, count); |
| 349 | } |
| 350 | |
| 351 | static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, |
| 352 | struct client *client) |
| 353 | { |
| 354 | struct fw_card *card = client->device->card; |
| 355 | |
| 356 | spin_lock_irq(&card->lock); |
| 357 | |
| 358 | event->closure = client->bus_reset_closure; |
| 359 | event->type = FW_CDEV_EVENT_BUS_RESET; |
| 360 | event->generation = client->device->generation; |
| 361 | event->node_id = client->device->node_id; |
| 362 | event->local_node_id = card->local_node->node_id; |
| 363 | event->bm_node_id = card->bm_node_id; |
| 364 | event->irm_node_id = card->irm_node->node_id; |
| 365 | event->root_node_id = card->root_node->node_id; |
| 366 | |
| 367 | spin_unlock_irq(&card->lock); |
| 368 | } |
| 369 | |
| 370 | static void for_each_client(struct fw_device *device, |
| 371 | void (*callback)(struct client *client)) |
| 372 | { |
| 373 | struct client *c; |
| 374 | |
| 375 | mutex_lock(&device->client_list_mutex); |
| 376 | list_for_each_entry(c, &device->client_list, link) |
| 377 | callback(c); |
| 378 | mutex_unlock(&device->client_list_mutex); |
| 379 | } |
| 380 | |
| 381 | static int schedule_reallocations(int id, void *p, void *data) |
| 382 | { |
| 383 | schedule_if_iso_resource(p); |
| 384 | |
| 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | static void queue_bus_reset_event(struct client *client) |
| 389 | { |
| 390 | struct bus_reset_event *e; |
| 391 | |
| 392 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
| 393 | if (e == NULL) |
| 394 | return; |
| 395 | |
| 396 | fill_bus_reset_event(&e->reset, client); |
| 397 | |
| 398 | queue_event(client, &e->event, |
| 399 | &e->reset, sizeof(e->reset), NULL, 0); |
| 400 | |
| 401 | spin_lock_irq(&client->lock); |
| 402 | idr_for_each(&client->resource_idr, schedule_reallocations, client); |
| 403 | spin_unlock_irq(&client->lock); |
| 404 | } |
| 405 | |
| 406 | void fw_device_cdev_update(struct fw_device *device) |
| 407 | { |
| 408 | for_each_client(device, queue_bus_reset_event); |
| 409 | } |
| 410 | |
| 411 | static void wake_up_client(struct client *client) |
| 412 | { |
| 413 | wake_up_interruptible(&client->wait); |
| 414 | } |
| 415 | |
| 416 | void fw_device_cdev_remove(struct fw_device *device) |
| 417 | { |
| 418 | for_each_client(device, wake_up_client); |
| 419 | } |
| 420 | |
| 421 | union ioctl_arg { |
| 422 | struct fw_cdev_get_info get_info; |
| 423 | struct fw_cdev_send_request send_request; |
| 424 | struct fw_cdev_allocate allocate; |
| 425 | struct fw_cdev_deallocate deallocate; |
| 426 | struct fw_cdev_send_response send_response; |
| 427 | struct fw_cdev_initiate_bus_reset initiate_bus_reset; |
| 428 | struct fw_cdev_add_descriptor add_descriptor; |
| 429 | struct fw_cdev_remove_descriptor remove_descriptor; |
| 430 | struct fw_cdev_create_iso_context create_iso_context; |
| 431 | struct fw_cdev_queue_iso queue_iso; |
| 432 | struct fw_cdev_start_iso start_iso; |
| 433 | struct fw_cdev_stop_iso stop_iso; |
| 434 | struct fw_cdev_get_cycle_timer get_cycle_timer; |
| 435 | struct fw_cdev_allocate_iso_resource allocate_iso_resource; |
| 436 | struct fw_cdev_send_stream_packet send_stream_packet; |
| 437 | struct fw_cdev_get_cycle_timer2 get_cycle_timer2; |
| 438 | struct fw_cdev_send_phy_packet send_phy_packet; |
| 439 | struct fw_cdev_receive_phy_packets receive_phy_packets; |
| 440 | struct fw_cdev_set_iso_channels set_iso_channels; |
| 441 | struct fw_cdev_flush_iso flush_iso; |
| 442 | }; |
| 443 | |
| 444 | static int ioctl_get_info(struct client *client, union ioctl_arg *arg) |
| 445 | { |
| 446 | struct fw_cdev_get_info *a = &arg->get_info; |
| 447 | struct fw_cdev_event_bus_reset bus_reset; |
| 448 | unsigned long ret = 0; |
| 449 | |
| 450 | client->version = a->version; |
| 451 | a->version = FW_CDEV_KERNEL_VERSION; |
| 452 | a->card = client->device->card->index; |
| 453 | |
| 454 | down_read(&fw_device_rwsem); |
| 455 | |
| 456 | if (a->rom != 0) { |
| 457 | size_t want = a->rom_length; |
| 458 | size_t have = client->device->config_rom_length * 4; |
| 459 | |
| 460 | ret = copy_to_user(u64_to_uptr(a->rom), |
| 461 | client->device->config_rom, min(want, have)); |
| 462 | } |
| 463 | a->rom_length = client->device->config_rom_length * 4; |
| 464 | |
| 465 | up_read(&fw_device_rwsem); |
| 466 | |
| 467 | if (ret != 0) |
| 468 | return -EFAULT; |
| 469 | |
| 470 | mutex_lock(&client->device->client_list_mutex); |
| 471 | |
| 472 | client->bus_reset_closure = a->bus_reset_closure; |
| 473 | if (a->bus_reset != 0) { |
| 474 | fill_bus_reset_event(&bus_reset, client); |
| 475 | /* unaligned size of bus_reset is 36 bytes */ |
| 476 | ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36); |
| 477 | } |
| 478 | if (ret == 0 && list_empty(&client->link)) |
| 479 | list_add_tail(&client->link, &client->device->client_list); |
| 480 | |
| 481 | mutex_unlock(&client->device->client_list_mutex); |
| 482 | |
| 483 | return ret ? -EFAULT : 0; |
| 484 | } |
| 485 | |
| 486 | static int add_client_resource(struct client *client, |
| 487 | struct client_resource *resource, gfp_t gfp_mask) |
| 488 | { |
| 489 | bool preload = !!(gfp_mask & __GFP_WAIT); |
| 490 | unsigned long flags; |
| 491 | int ret; |
| 492 | |
| 493 | if (preload) |
| 494 | idr_preload(gfp_mask); |
| 495 | spin_lock_irqsave(&client->lock, flags); |
| 496 | |
| 497 | if (client->in_shutdown) |
| 498 | ret = -ECANCELED; |
| 499 | else |
| 500 | ret = idr_alloc(&client->resource_idr, resource, 0, 0, |
| 501 | GFP_NOWAIT); |
| 502 | if (ret >= 0) { |
| 503 | resource->handle = ret; |
| 504 | client_get(client); |
| 505 | schedule_if_iso_resource(resource); |
| 506 | } |
| 507 | |
| 508 | spin_unlock_irqrestore(&client->lock, flags); |
| 509 | if (preload) |
| 510 | idr_preload_end(); |
| 511 | |
| 512 | return ret < 0 ? ret : 0; |
| 513 | } |
| 514 | |
| 515 | static int release_client_resource(struct client *client, u32 handle, |
| 516 | client_resource_release_fn_t release, |
| 517 | struct client_resource **return_resource) |
| 518 | { |
| 519 | struct client_resource *resource; |
| 520 | |
| 521 | spin_lock_irq(&client->lock); |
| 522 | if (client->in_shutdown) |
| 523 | resource = NULL; |
| 524 | else |
| 525 | resource = idr_find(&client->resource_idr, handle); |
| 526 | if (resource && resource->release == release) |
| 527 | idr_remove(&client->resource_idr, handle); |
| 528 | spin_unlock_irq(&client->lock); |
| 529 | |
| 530 | if (!(resource && resource->release == release)) |
| 531 | return -EINVAL; |
| 532 | |
| 533 | if (return_resource) |
| 534 | *return_resource = resource; |
| 535 | else |
| 536 | resource->release(client, resource); |
| 537 | |
| 538 | client_put(client); |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static void release_transaction(struct client *client, |
| 544 | struct client_resource *resource) |
| 545 | { |
| 546 | } |
| 547 | |
| 548 | static void complete_transaction(struct fw_card *card, int rcode, |
| 549 | void *payload, size_t length, void *data) |
| 550 | { |
| 551 | struct outbound_transaction_event *e = data; |
| 552 | struct fw_cdev_event_response *rsp = &e->response; |
| 553 | struct client *client = e->client; |
| 554 | unsigned long flags; |
| 555 | |
| 556 | if (length < rsp->length) |
| 557 | rsp->length = length; |
| 558 | if (rcode == RCODE_COMPLETE) |
| 559 | memcpy(rsp->data, payload, rsp->length); |
| 560 | |
| 561 | spin_lock_irqsave(&client->lock, flags); |
| 562 | idr_remove(&client->resource_idr, e->r.resource.handle); |
| 563 | if (client->in_shutdown) |
| 564 | wake_up(&client->tx_flush_wait); |
| 565 | spin_unlock_irqrestore(&client->lock, flags); |
| 566 | |
| 567 | rsp->type = FW_CDEV_EVENT_RESPONSE; |
| 568 | rsp->rcode = rcode; |
| 569 | |
| 570 | /* |
| 571 | * In the case that sizeof(*rsp) doesn't align with the position of the |
| 572 | * data, and the read is short, preserve an extra copy of the data |
| 573 | * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless |
| 574 | * for short reads and some apps depended on it, this is both safe |
| 575 | * and prudent for compatibility. |
| 576 | */ |
| 577 | if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data)) |
| 578 | queue_event(client, &e->event, rsp, sizeof(*rsp), |
| 579 | rsp->data, rsp->length); |
| 580 | else |
| 581 | queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, |
| 582 | NULL, 0); |
| 583 | |
| 584 | /* Drop the idr's reference */ |
| 585 | client_put(client); |
| 586 | } |
| 587 | |
| 588 | static int init_request(struct client *client, |
| 589 | struct fw_cdev_send_request *request, |
| 590 | int destination_id, int speed) |
| 591 | { |
| 592 | struct outbound_transaction_event *e; |
| 593 | int ret; |
| 594 | |
| 595 | if (request->tcode != TCODE_STREAM_DATA && |
| 596 | (request->length > 4096 || request->length > 512 << speed)) |
| 597 | return -EIO; |
| 598 | |
| 599 | if (request->tcode == TCODE_WRITE_QUADLET_REQUEST && |
| 600 | request->length < 4) |
| 601 | return -EINVAL; |
| 602 | |
| 603 | e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL); |
| 604 | if (e == NULL) |
| 605 | return -ENOMEM; |
| 606 | |
| 607 | e->client = client; |
| 608 | e->response.length = request->length; |
| 609 | e->response.closure = request->closure; |
| 610 | |
| 611 | if (request->data && |
| 612 | copy_from_user(e->response.data, |
| 613 | u64_to_uptr(request->data), request->length)) { |
| 614 | ret = -EFAULT; |
| 615 | goto failed; |
| 616 | } |
| 617 | |
| 618 | e->r.resource.release = release_transaction; |
| 619 | ret = add_client_resource(client, &e->r.resource, GFP_KERNEL); |
| 620 | if (ret < 0) |
| 621 | goto failed; |
| 622 | |
| 623 | fw_send_request(client->device->card, &e->r.transaction, |
| 624 | request->tcode, destination_id, request->generation, |
| 625 | speed, request->offset, e->response.data, |
| 626 | request->length, complete_transaction, e); |
| 627 | return 0; |
| 628 | |
| 629 | failed: |
| 630 | kfree(e); |
| 631 | |
| 632 | return ret; |
| 633 | } |
| 634 | |
| 635 | static int ioctl_send_request(struct client *client, union ioctl_arg *arg) |
| 636 | { |
| 637 | switch (arg->send_request.tcode) { |
| 638 | case TCODE_WRITE_QUADLET_REQUEST: |
| 639 | case TCODE_WRITE_BLOCK_REQUEST: |
| 640 | case TCODE_READ_QUADLET_REQUEST: |
| 641 | case TCODE_READ_BLOCK_REQUEST: |
| 642 | case TCODE_LOCK_MASK_SWAP: |
| 643 | case TCODE_LOCK_COMPARE_SWAP: |
| 644 | case TCODE_LOCK_FETCH_ADD: |
| 645 | case TCODE_LOCK_LITTLE_ADD: |
| 646 | case TCODE_LOCK_BOUNDED_ADD: |
| 647 | case TCODE_LOCK_WRAP_ADD: |
| 648 | case TCODE_LOCK_VENDOR_DEPENDENT: |
| 649 | break; |
| 650 | default: |
| 651 | return -EINVAL; |
| 652 | } |
| 653 | |
| 654 | return init_request(client, &arg->send_request, client->device->node_id, |
| 655 | client->device->max_speed); |
| 656 | } |
| 657 | |
| 658 | static inline bool is_fcp_request(struct fw_request *request) |
| 659 | { |
| 660 | return request == NULL; |
| 661 | } |
| 662 | |
| 663 | static void release_request(struct client *client, |
| 664 | struct client_resource *resource) |
| 665 | { |
| 666 | struct inbound_transaction_resource *r = container_of(resource, |
| 667 | struct inbound_transaction_resource, resource); |
| 668 | |
| 669 | if (is_fcp_request(r->request)) |
| 670 | kfree(r->data); |
| 671 | else |
| 672 | fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR); |
| 673 | |
| 674 | fw_card_put(r->card); |
| 675 | kfree(r); |
| 676 | } |
| 677 | |
| 678 | static void handle_request(struct fw_card *card, struct fw_request *request, |
| 679 | int tcode, int destination, int source, |
| 680 | int generation, unsigned long long offset, |
| 681 | void *payload, size_t length, void *callback_data) |
| 682 | { |
| 683 | struct address_handler_resource *handler = callback_data; |
| 684 | struct inbound_transaction_resource *r; |
| 685 | struct inbound_transaction_event *e; |
| 686 | size_t event_size0; |
| 687 | void *fcp_frame = NULL; |
| 688 | int ret; |
| 689 | |
| 690 | /* card may be different from handler->client->device->card */ |
| 691 | fw_card_get(card); |
| 692 | |
| 693 | r = kmalloc(sizeof(*r), GFP_ATOMIC); |
| 694 | e = kmalloc(sizeof(*e), GFP_ATOMIC); |
| 695 | if (r == NULL || e == NULL) |
| 696 | goto failed; |
| 697 | |
| 698 | r->card = card; |
| 699 | r->request = request; |
| 700 | r->data = payload; |
| 701 | r->length = length; |
| 702 | |
| 703 | if (is_fcp_request(request)) { |
| 704 | /* |
| 705 | * FIXME: Let core-transaction.c manage a |
| 706 | * single reference-counted copy? |
| 707 | */ |
| 708 | fcp_frame = kmemdup(payload, length, GFP_ATOMIC); |
| 709 | if (fcp_frame == NULL) |
| 710 | goto failed; |
| 711 | |
| 712 | r->data = fcp_frame; |
| 713 | } |
| 714 | |
| 715 | r->resource.release = release_request; |
| 716 | ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC); |
| 717 | if (ret < 0) |
| 718 | goto failed; |
| 719 | |
| 720 | if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) { |
| 721 | struct fw_cdev_event_request *req = &e->req.request; |
| 722 | |
| 723 | if (tcode & 0x10) |
| 724 | tcode = TCODE_LOCK_REQUEST; |
| 725 | |
| 726 | req->type = FW_CDEV_EVENT_REQUEST; |
| 727 | req->tcode = tcode; |
| 728 | req->offset = offset; |
| 729 | req->length = length; |
| 730 | req->handle = r->resource.handle; |
| 731 | req->closure = handler->closure; |
| 732 | event_size0 = sizeof(*req); |
| 733 | } else { |
| 734 | struct fw_cdev_event_request2 *req = &e->req.request2; |
| 735 | |
| 736 | req->type = FW_CDEV_EVENT_REQUEST2; |
| 737 | req->tcode = tcode; |
| 738 | req->offset = offset; |
| 739 | req->source_node_id = source; |
| 740 | req->destination_node_id = destination; |
| 741 | req->card = card->index; |
| 742 | req->generation = generation; |
| 743 | req->length = length; |
| 744 | req->handle = r->resource.handle; |
| 745 | req->closure = handler->closure; |
| 746 | event_size0 = sizeof(*req); |
| 747 | } |
| 748 | |
| 749 | queue_event(handler->client, &e->event, |
| 750 | &e->req, event_size0, r->data, length); |
| 751 | return; |
| 752 | |
| 753 | failed: |
| 754 | kfree(r); |
| 755 | kfree(e); |
| 756 | kfree(fcp_frame); |
| 757 | |
| 758 | if (!is_fcp_request(request)) |
| 759 | fw_send_response(card, request, RCODE_CONFLICT_ERROR); |
| 760 | |
| 761 | fw_card_put(card); |
| 762 | } |
| 763 | |
| 764 | static void release_address_handler(struct client *client, |
| 765 | struct client_resource *resource) |
| 766 | { |
| 767 | struct address_handler_resource *r = |
| 768 | container_of(resource, struct address_handler_resource, resource); |
| 769 | |
| 770 | fw_core_remove_address_handler(&r->handler); |
| 771 | kfree(r); |
| 772 | } |
| 773 | |
| 774 | static int ioctl_allocate(struct client *client, union ioctl_arg *arg) |
| 775 | { |
| 776 | struct fw_cdev_allocate *a = &arg->allocate; |
| 777 | struct address_handler_resource *r; |
| 778 | struct fw_address_region region; |
| 779 | int ret; |
| 780 | |
| 781 | r = kmalloc(sizeof(*r), GFP_KERNEL); |
| 782 | if (r == NULL) |
| 783 | return -ENOMEM; |
| 784 | |
| 785 | region.start = a->offset; |
| 786 | if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END) |
| 787 | region.end = a->offset + a->length; |
| 788 | else |
| 789 | region.end = a->region_end; |
| 790 | |
| 791 | r->handler.length = a->length; |
| 792 | r->handler.address_callback = handle_request; |
| 793 | r->handler.callback_data = r; |
| 794 | r->closure = a->closure; |
| 795 | r->client = client; |
| 796 | |
| 797 | ret = fw_core_add_address_handler(&r->handler, ®ion); |
| 798 | if (ret < 0) { |
| 799 | kfree(r); |
| 800 | return ret; |
| 801 | } |
| 802 | a->offset = r->handler.offset; |
| 803 | |
| 804 | r->resource.release = release_address_handler; |
| 805 | ret = add_client_resource(client, &r->resource, GFP_KERNEL); |
| 806 | if (ret < 0) { |
| 807 | release_address_handler(client, &r->resource); |
| 808 | return ret; |
| 809 | } |
| 810 | a->handle = r->resource.handle; |
| 811 | |
| 812 | return 0; |
| 813 | } |
| 814 | |
| 815 | static int ioctl_deallocate(struct client *client, union ioctl_arg *arg) |
| 816 | { |
| 817 | return release_client_resource(client, arg->deallocate.handle, |
| 818 | release_address_handler, NULL); |
| 819 | } |
| 820 | |
| 821 | static int ioctl_send_response(struct client *client, union ioctl_arg *arg) |
| 822 | { |
| 823 | struct fw_cdev_send_response *a = &arg->send_response; |
| 824 | struct client_resource *resource; |
| 825 | struct inbound_transaction_resource *r; |
| 826 | int ret = 0; |
| 827 | |
| 828 | if (release_client_resource(client, a->handle, |
| 829 | release_request, &resource) < 0) |
| 830 | return -EINVAL; |
| 831 | |
| 832 | r = container_of(resource, struct inbound_transaction_resource, |
| 833 | resource); |
| 834 | if (is_fcp_request(r->request)) |
| 835 | goto out; |
| 836 | |
| 837 | if (a->length != fw_get_response_length(r->request)) { |
| 838 | ret = -EINVAL; |
| 839 | kfree(r->request); |
| 840 | goto out; |
| 841 | } |
| 842 | if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) { |
| 843 | ret = -EFAULT; |
| 844 | kfree(r->request); |
| 845 | goto out; |
| 846 | } |
| 847 | fw_send_response(r->card, r->request, a->rcode); |
| 848 | out: |
| 849 | fw_card_put(r->card); |
| 850 | kfree(r); |
| 851 | |
| 852 | return ret; |
| 853 | } |
| 854 | |
| 855 | static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg) |
| 856 | { |
| 857 | fw_schedule_bus_reset(client->device->card, true, |
| 858 | arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET); |
| 859 | return 0; |
| 860 | } |
| 861 | |
| 862 | static void release_descriptor(struct client *client, |
| 863 | struct client_resource *resource) |
| 864 | { |
| 865 | struct descriptor_resource *r = |
| 866 | container_of(resource, struct descriptor_resource, resource); |
| 867 | |
| 868 | fw_core_remove_descriptor(&r->descriptor); |
| 869 | kfree(r); |
| 870 | } |
| 871 | |
| 872 | static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg) |
| 873 | { |
| 874 | struct fw_cdev_add_descriptor *a = &arg->add_descriptor; |
| 875 | struct descriptor_resource *r; |
| 876 | int ret; |
| 877 | |
| 878 | /* Access policy: Allow this ioctl only on local nodes' device files. */ |
| 879 | if (!client->device->is_local) |
| 880 | return -ENOSYS; |
| 881 | |
| 882 | if (a->length > 256) |
| 883 | return -EINVAL; |
| 884 | |
| 885 | r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL); |
| 886 | if (r == NULL) |
| 887 | return -ENOMEM; |
| 888 | |
| 889 | if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) { |
| 890 | ret = -EFAULT; |
| 891 | goto failed; |
| 892 | } |
| 893 | |
| 894 | r->descriptor.length = a->length; |
| 895 | r->descriptor.immediate = a->immediate; |
| 896 | r->descriptor.key = a->key; |
| 897 | r->descriptor.data = r->data; |
| 898 | |
| 899 | ret = fw_core_add_descriptor(&r->descriptor); |
| 900 | if (ret < 0) |
| 901 | goto failed; |
| 902 | |
| 903 | r->resource.release = release_descriptor; |
| 904 | ret = add_client_resource(client, &r->resource, GFP_KERNEL); |
| 905 | if (ret < 0) { |
| 906 | fw_core_remove_descriptor(&r->descriptor); |
| 907 | goto failed; |
| 908 | } |
| 909 | a->handle = r->resource.handle; |
| 910 | |
| 911 | return 0; |
| 912 | failed: |
| 913 | kfree(r); |
| 914 | |
| 915 | return ret; |
| 916 | } |
| 917 | |
| 918 | static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg) |
| 919 | { |
| 920 | return release_client_resource(client, arg->remove_descriptor.handle, |
| 921 | release_descriptor, NULL); |
| 922 | } |
| 923 | |
| 924 | static void iso_callback(struct fw_iso_context *context, u32 cycle, |
| 925 | size_t header_length, void *header, void *data) |
| 926 | { |
| 927 | struct client *client = data; |
| 928 | struct iso_interrupt_event *e; |
| 929 | |
| 930 | e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC); |
| 931 | if (e == NULL) |
| 932 | return; |
| 933 | |
| 934 | e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; |
| 935 | e->interrupt.closure = client->iso_closure; |
| 936 | e->interrupt.cycle = cycle; |
| 937 | e->interrupt.header_length = header_length; |
| 938 | memcpy(e->interrupt.header, header, header_length); |
| 939 | queue_event(client, &e->event, &e->interrupt, |
| 940 | sizeof(e->interrupt) + header_length, NULL, 0); |
| 941 | } |
| 942 | |
| 943 | static void iso_mc_callback(struct fw_iso_context *context, |
| 944 | dma_addr_t completed, void *data) |
| 945 | { |
| 946 | struct client *client = data; |
| 947 | struct iso_interrupt_mc_event *e; |
| 948 | |
| 949 | e = kmalloc(sizeof(*e), GFP_ATOMIC); |
| 950 | if (e == NULL) |
| 951 | return; |
| 952 | |
| 953 | e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL; |
| 954 | e->interrupt.closure = client->iso_closure; |
| 955 | e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer, |
| 956 | completed); |
| 957 | queue_event(client, &e->event, &e->interrupt, |
| 958 | sizeof(e->interrupt), NULL, 0); |
| 959 | } |
| 960 | |
| 961 | static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context) |
| 962 | { |
| 963 | if (context->type == FW_ISO_CONTEXT_TRANSMIT) |
| 964 | return DMA_TO_DEVICE; |
| 965 | else |
| 966 | return DMA_FROM_DEVICE; |
| 967 | } |
| 968 | |
| 969 | static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) |
| 970 | { |
| 971 | struct fw_cdev_create_iso_context *a = &arg->create_iso_context; |
| 972 | struct fw_iso_context *context; |
| 973 | fw_iso_callback_t cb; |
| 974 | int ret; |
| 975 | |
| 976 | BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT || |
| 977 | FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE || |
| 978 | FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL != |
| 979 | FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL); |
| 980 | |
| 981 | switch (a->type) { |
| 982 | case FW_ISO_CONTEXT_TRANSMIT: |
| 983 | if (a->speed > SCODE_3200 || a->channel > 63) |
| 984 | return -EINVAL; |
| 985 | |
| 986 | cb = iso_callback; |
| 987 | break; |
| 988 | |
| 989 | case FW_ISO_CONTEXT_RECEIVE: |
| 990 | if (a->header_size < 4 || (a->header_size & 3) || |
| 991 | a->channel > 63) |
| 992 | return -EINVAL; |
| 993 | |
| 994 | cb = iso_callback; |
| 995 | break; |
| 996 | |
| 997 | case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: |
| 998 | cb = (fw_iso_callback_t)iso_mc_callback; |
| 999 | break; |
| 1000 | |
| 1001 | default: |
| 1002 | return -EINVAL; |
| 1003 | } |
| 1004 | |
| 1005 | context = fw_iso_context_create(client->device->card, a->type, |
| 1006 | a->channel, a->speed, a->header_size, cb, client); |
| 1007 | if (IS_ERR(context)) |
| 1008 | return PTR_ERR(context); |
| 1009 | if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW) |
| 1010 | context->drop_overflow_headers = true; |
| 1011 | |
| 1012 | /* We only support one context at this time. */ |
| 1013 | spin_lock_irq(&client->lock); |
| 1014 | if (client->iso_context != NULL) { |
| 1015 | spin_unlock_irq(&client->lock); |
| 1016 | fw_iso_context_destroy(context); |
| 1017 | |
| 1018 | return -EBUSY; |
| 1019 | } |
| 1020 | if (!client->buffer_is_mapped) { |
| 1021 | ret = fw_iso_buffer_map_dma(&client->buffer, |
| 1022 | client->device->card, |
| 1023 | iso_dma_direction(context)); |
| 1024 | if (ret < 0) { |
| 1025 | spin_unlock_irq(&client->lock); |
| 1026 | fw_iso_context_destroy(context); |
| 1027 | |
| 1028 | return ret; |
| 1029 | } |
| 1030 | client->buffer_is_mapped = true; |
| 1031 | } |
| 1032 | client->iso_closure = a->closure; |
| 1033 | client->iso_context = context; |
| 1034 | spin_unlock_irq(&client->lock); |
| 1035 | |
| 1036 | a->handle = 0; |
| 1037 | |
| 1038 | return 0; |
| 1039 | } |
| 1040 | |
| 1041 | static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg) |
| 1042 | { |
| 1043 | struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels; |
| 1044 | struct fw_iso_context *ctx = client->iso_context; |
| 1045 | |
| 1046 | if (ctx == NULL || a->handle != 0) |
| 1047 | return -EINVAL; |
| 1048 | |
| 1049 | return fw_iso_context_set_channels(ctx, &a->channels); |
| 1050 | } |
| 1051 | |
| 1052 | /* Macros for decoding the iso packet control header. */ |
| 1053 | #define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) |
| 1054 | #define GET_INTERRUPT(v) (((v) >> 16) & 0x01) |
| 1055 | #define GET_SKIP(v) (((v) >> 17) & 0x01) |
| 1056 | #define GET_TAG(v) (((v) >> 18) & 0x03) |
| 1057 | #define GET_SY(v) (((v) >> 20) & 0x0f) |
| 1058 | #define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) |
| 1059 | |
| 1060 | static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) |
| 1061 | { |
| 1062 | struct fw_cdev_queue_iso *a = &arg->queue_iso; |
| 1063 | struct fw_cdev_iso_packet __user *p, *end, *next; |
| 1064 | struct fw_iso_context *ctx = client->iso_context; |
| 1065 | unsigned long payload, buffer_end, transmit_header_bytes = 0; |
| 1066 | u32 control; |
| 1067 | int count; |
| 1068 | struct { |
| 1069 | struct fw_iso_packet packet; |
| 1070 | u8 header[256]; |
| 1071 | } u; |
| 1072 | |
| 1073 | if (ctx == NULL || a->handle != 0) |
| 1074 | return -EINVAL; |
| 1075 | |
| 1076 | /* |
| 1077 | * If the user passes a non-NULL data pointer, has mmap()'ed |
| 1078 | * the iso buffer, and the pointer points inside the buffer, |
| 1079 | * we setup the payload pointers accordingly. Otherwise we |
| 1080 | * set them both to 0, which will still let packets with |
| 1081 | * payload_length == 0 through. In other words, if no packets |
| 1082 | * use the indirect payload, the iso buffer need not be mapped |
| 1083 | * and the a->data pointer is ignored. |
| 1084 | */ |
| 1085 | payload = (unsigned long)a->data - client->vm_start; |
| 1086 | buffer_end = client->buffer.page_count << PAGE_SHIFT; |
| 1087 | if (a->data == 0 || client->buffer.pages == NULL || |
| 1088 | payload >= buffer_end) { |
| 1089 | payload = 0; |
| 1090 | buffer_end = 0; |
| 1091 | } |
| 1092 | |
| 1093 | if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3) |
| 1094 | return -EINVAL; |
| 1095 | |
| 1096 | p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets); |
| 1097 | if (!access_ok(VERIFY_READ, p, a->size)) |
| 1098 | return -EFAULT; |
| 1099 | |
| 1100 | end = (void __user *)p + a->size; |
| 1101 | count = 0; |
| 1102 | while (p < end) { |
| 1103 | if (get_user(control, &p->control)) |
| 1104 | return -EFAULT; |
| 1105 | u.packet.payload_length = GET_PAYLOAD_LENGTH(control); |
| 1106 | u.packet.interrupt = GET_INTERRUPT(control); |
| 1107 | u.packet.skip = GET_SKIP(control); |
| 1108 | u.packet.tag = GET_TAG(control); |
| 1109 | u.packet.sy = GET_SY(control); |
| 1110 | u.packet.header_length = GET_HEADER_LENGTH(control); |
| 1111 | |
| 1112 | switch (ctx->type) { |
| 1113 | case FW_ISO_CONTEXT_TRANSMIT: |
| 1114 | if (u.packet.header_length & 3) |
| 1115 | return -EINVAL; |
| 1116 | transmit_header_bytes = u.packet.header_length; |
| 1117 | break; |
| 1118 | |
| 1119 | case FW_ISO_CONTEXT_RECEIVE: |
| 1120 | if (u.packet.header_length == 0 || |
| 1121 | u.packet.header_length % ctx->header_size != 0) |
| 1122 | return -EINVAL; |
| 1123 | break; |
| 1124 | |
| 1125 | case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: |
| 1126 | if (u.packet.payload_length == 0 || |
| 1127 | u.packet.payload_length & 3) |
| 1128 | return -EINVAL; |
| 1129 | break; |
| 1130 | } |
| 1131 | |
| 1132 | next = (struct fw_cdev_iso_packet __user *) |
| 1133 | &p->header[transmit_header_bytes / 4]; |
| 1134 | if (next > end) |
| 1135 | return -EINVAL; |
| 1136 | if (__copy_from_user |
| 1137 | (u.packet.header, p->header, transmit_header_bytes)) |
| 1138 | return -EFAULT; |
| 1139 | if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && |
| 1140 | u.packet.header_length + u.packet.payload_length > 0) |
| 1141 | return -EINVAL; |
| 1142 | if (payload + u.packet.payload_length > buffer_end) |
| 1143 | return -EINVAL; |
| 1144 | |
| 1145 | if (fw_iso_context_queue(ctx, &u.packet, |
| 1146 | &client->buffer, payload)) |
| 1147 | break; |
| 1148 | |
| 1149 | p = next; |
| 1150 | payload += u.packet.payload_length; |
| 1151 | count++; |
| 1152 | } |
| 1153 | fw_iso_context_queue_flush(ctx); |
| 1154 | |
| 1155 | a->size -= uptr_to_u64(p) - a->packets; |
| 1156 | a->packets = uptr_to_u64(p); |
| 1157 | a->data = client->vm_start + payload; |
| 1158 | |
| 1159 | return count; |
| 1160 | } |
| 1161 | |
| 1162 | static int ioctl_start_iso(struct client *client, union ioctl_arg *arg) |
| 1163 | { |
| 1164 | struct fw_cdev_start_iso *a = &arg->start_iso; |
| 1165 | |
| 1166 | BUILD_BUG_ON( |
| 1167 | FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 || |
| 1168 | FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 || |
| 1169 | FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 || |
| 1170 | FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 || |
| 1171 | FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS); |
| 1172 | |
| 1173 | if (client->iso_context == NULL || a->handle != 0) |
| 1174 | return -EINVAL; |
| 1175 | |
| 1176 | if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE && |
| 1177 | (a->tags == 0 || a->tags > 15 || a->sync > 15)) |
| 1178 | return -EINVAL; |
| 1179 | |
| 1180 | return fw_iso_context_start(client->iso_context, |
| 1181 | a->cycle, a->sync, a->tags); |
| 1182 | } |
| 1183 | |
| 1184 | static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg) |
| 1185 | { |
| 1186 | struct fw_cdev_stop_iso *a = &arg->stop_iso; |
| 1187 | |
| 1188 | if (client->iso_context == NULL || a->handle != 0) |
| 1189 | return -EINVAL; |
| 1190 | |
| 1191 | return fw_iso_context_stop(client->iso_context); |
| 1192 | } |
| 1193 | |
| 1194 | static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg) |
| 1195 | { |
| 1196 | struct fw_cdev_flush_iso *a = &arg->flush_iso; |
| 1197 | |
| 1198 | if (client->iso_context == NULL || a->handle != 0) |
| 1199 | return -EINVAL; |
| 1200 | |
| 1201 | return fw_iso_context_flush_completions(client->iso_context); |
| 1202 | } |
| 1203 | |
| 1204 | static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg) |
| 1205 | { |
| 1206 | struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2; |
| 1207 | struct fw_card *card = client->device->card; |
| 1208 | struct timespec ts = {0, 0}; |
| 1209 | u32 cycle_time; |
| 1210 | int ret = 0; |
| 1211 | |
| 1212 | local_irq_disable(); |
| 1213 | |
| 1214 | cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME); |
| 1215 | |
| 1216 | switch (a->clk_id) { |
| 1217 | case CLOCK_REALTIME: getnstimeofday(&ts); break; |
| 1218 | case CLOCK_MONOTONIC: ktime_get_ts(&ts); break; |
| 1219 | case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts); break; |
| 1220 | default: |
| 1221 | ret = -EINVAL; |
| 1222 | } |
| 1223 | |
| 1224 | local_irq_enable(); |
| 1225 | |
| 1226 | a->tv_sec = ts.tv_sec; |
| 1227 | a->tv_nsec = ts.tv_nsec; |
| 1228 | a->cycle_timer = cycle_time; |
| 1229 | |
| 1230 | return ret; |
| 1231 | } |
| 1232 | |
| 1233 | static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg) |
| 1234 | { |
| 1235 | struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer; |
| 1236 | struct fw_cdev_get_cycle_timer2 ct2; |
| 1237 | |
| 1238 | ct2.clk_id = CLOCK_REALTIME; |
| 1239 | ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2); |
| 1240 | |
| 1241 | a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC; |
| 1242 | a->cycle_timer = ct2.cycle_timer; |
| 1243 | |
| 1244 | return 0; |
| 1245 | } |
| 1246 | |
| 1247 | static void iso_resource_work(struct work_struct *work) |
| 1248 | { |
| 1249 | struct iso_resource_event *e; |
| 1250 | struct iso_resource *r = |
| 1251 | container_of(work, struct iso_resource, work.work); |
| 1252 | struct client *client = r->client; |
| 1253 | int generation, channel, bandwidth, todo; |
| 1254 | bool skip, free, success; |
| 1255 | |
| 1256 | spin_lock_irq(&client->lock); |
| 1257 | generation = client->device->generation; |
| 1258 | todo = r->todo; |
| 1259 | /* Allow 1000ms grace period for other reallocations. */ |
| 1260 | if (todo == ISO_RES_ALLOC && |
| 1261 | time_before64(get_jiffies_64(), |
| 1262 | client->device->card->reset_jiffies + HZ)) { |
| 1263 | schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3)); |
| 1264 | skip = true; |
| 1265 | } else { |
| 1266 | /* We could be called twice within the same generation. */ |
| 1267 | skip = todo == ISO_RES_REALLOC && |
| 1268 | r->generation == generation; |
| 1269 | } |
| 1270 | free = todo == ISO_RES_DEALLOC || |
| 1271 | todo == ISO_RES_ALLOC_ONCE || |
| 1272 | todo == ISO_RES_DEALLOC_ONCE; |
| 1273 | r->generation = generation; |
| 1274 | spin_unlock_irq(&client->lock); |
| 1275 | |
| 1276 | if (skip) |
| 1277 | goto out; |
| 1278 | |
| 1279 | bandwidth = r->bandwidth; |
| 1280 | |
| 1281 | fw_iso_resource_manage(client->device->card, generation, |
| 1282 | r->channels, &channel, &bandwidth, |
| 1283 | todo == ISO_RES_ALLOC || |
| 1284 | todo == ISO_RES_REALLOC || |
| 1285 | todo == ISO_RES_ALLOC_ONCE); |
| 1286 | /* |
| 1287 | * Is this generation outdated already? As long as this resource sticks |
| 1288 | * in the idr, it will be scheduled again for a newer generation or at |
| 1289 | * shutdown. |
| 1290 | */ |
| 1291 | if (channel == -EAGAIN && |
| 1292 | (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC)) |
| 1293 | goto out; |
| 1294 | |
| 1295 | success = channel >= 0 || bandwidth > 0; |
| 1296 | |
| 1297 | spin_lock_irq(&client->lock); |
| 1298 | /* |
| 1299 | * Transit from allocation to reallocation, except if the client |
| 1300 | * requested deallocation in the meantime. |
| 1301 | */ |
| 1302 | if (r->todo == ISO_RES_ALLOC) |
| 1303 | r->todo = ISO_RES_REALLOC; |
| 1304 | /* |
| 1305 | * Allocation or reallocation failure? Pull this resource out of the |
| 1306 | * idr and prepare for deletion, unless the client is shutting down. |
| 1307 | */ |
| 1308 | if (r->todo == ISO_RES_REALLOC && !success && |
| 1309 | !client->in_shutdown && |
| 1310 | idr_find(&client->resource_idr, r->resource.handle)) { |
| 1311 | idr_remove(&client->resource_idr, r->resource.handle); |
| 1312 | client_put(client); |
| 1313 | free = true; |
| 1314 | } |
| 1315 | spin_unlock_irq(&client->lock); |
| 1316 | |
| 1317 | if (todo == ISO_RES_ALLOC && channel >= 0) |
| 1318 | r->channels = 1ULL << channel; |
| 1319 | |
| 1320 | if (todo == ISO_RES_REALLOC && success) |
| 1321 | goto out; |
| 1322 | |
| 1323 | if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) { |
| 1324 | e = r->e_alloc; |
| 1325 | r->e_alloc = NULL; |
| 1326 | } else { |
| 1327 | e = r->e_dealloc; |
| 1328 | r->e_dealloc = NULL; |
| 1329 | } |
| 1330 | e->iso_resource.handle = r->resource.handle; |
| 1331 | e->iso_resource.channel = channel; |
| 1332 | e->iso_resource.bandwidth = bandwidth; |
| 1333 | |
| 1334 | queue_event(client, &e->event, |
| 1335 | &e->iso_resource, sizeof(e->iso_resource), NULL, 0); |
| 1336 | |
| 1337 | if (free) { |
| 1338 | cancel_delayed_work(&r->work); |
| 1339 | kfree(r->e_alloc); |
| 1340 | kfree(r->e_dealloc); |
| 1341 | kfree(r); |
| 1342 | } |
| 1343 | out: |
| 1344 | client_put(client); |
| 1345 | } |
| 1346 | |
| 1347 | static void release_iso_resource(struct client *client, |
| 1348 | struct client_resource *resource) |
| 1349 | { |
| 1350 | struct iso_resource *r = |
| 1351 | container_of(resource, struct iso_resource, resource); |
| 1352 | |
| 1353 | spin_lock_irq(&client->lock); |
| 1354 | r->todo = ISO_RES_DEALLOC; |
| 1355 | schedule_iso_resource(r, 0); |
| 1356 | spin_unlock_irq(&client->lock); |
| 1357 | } |
| 1358 | |
| 1359 | static int init_iso_resource(struct client *client, |
| 1360 | struct fw_cdev_allocate_iso_resource *request, int todo) |
| 1361 | { |
| 1362 | struct iso_resource_event *e1, *e2; |
| 1363 | struct iso_resource *r; |
| 1364 | int ret; |
| 1365 | |
| 1366 | if ((request->channels == 0 && request->bandwidth == 0) || |
| 1367 | request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL) |
| 1368 | return -EINVAL; |
| 1369 | |
| 1370 | r = kmalloc(sizeof(*r), GFP_KERNEL); |
| 1371 | e1 = kmalloc(sizeof(*e1), GFP_KERNEL); |
| 1372 | e2 = kmalloc(sizeof(*e2), GFP_KERNEL); |
| 1373 | if (r == NULL || e1 == NULL || e2 == NULL) { |
| 1374 | ret = -ENOMEM; |
| 1375 | goto fail; |
| 1376 | } |
| 1377 | |
| 1378 | INIT_DELAYED_WORK(&r->work, iso_resource_work); |
| 1379 | r->client = client; |
| 1380 | r->todo = todo; |
| 1381 | r->generation = -1; |
| 1382 | r->channels = request->channels; |
| 1383 | r->bandwidth = request->bandwidth; |
| 1384 | r->e_alloc = e1; |
| 1385 | r->e_dealloc = e2; |
| 1386 | |
| 1387 | e1->iso_resource.closure = request->closure; |
| 1388 | e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED; |
| 1389 | e2->iso_resource.closure = request->closure; |
| 1390 | e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED; |
| 1391 | |
| 1392 | if (todo == ISO_RES_ALLOC) { |
| 1393 | r->resource.release = release_iso_resource; |
| 1394 | ret = add_client_resource(client, &r->resource, GFP_KERNEL); |
| 1395 | if (ret < 0) |
| 1396 | goto fail; |
| 1397 | } else { |
| 1398 | r->resource.release = NULL; |
| 1399 | r->resource.handle = -1; |
| 1400 | schedule_iso_resource(r, 0); |
| 1401 | } |
| 1402 | request->handle = r->resource.handle; |
| 1403 | |
| 1404 | return 0; |
| 1405 | fail: |
| 1406 | kfree(r); |
| 1407 | kfree(e1); |
| 1408 | kfree(e2); |
| 1409 | |
| 1410 | return ret; |
| 1411 | } |
| 1412 | |
| 1413 | static int ioctl_allocate_iso_resource(struct client *client, |
| 1414 | union ioctl_arg *arg) |
| 1415 | { |
| 1416 | return init_iso_resource(client, |
| 1417 | &arg->allocate_iso_resource, ISO_RES_ALLOC); |
| 1418 | } |
| 1419 | |
| 1420 | static int ioctl_deallocate_iso_resource(struct client *client, |
| 1421 | union ioctl_arg *arg) |
| 1422 | { |
| 1423 | return release_client_resource(client, |
| 1424 | arg->deallocate.handle, release_iso_resource, NULL); |
| 1425 | } |
| 1426 | |
| 1427 | static int ioctl_allocate_iso_resource_once(struct client *client, |
| 1428 | union ioctl_arg *arg) |
| 1429 | { |
| 1430 | return init_iso_resource(client, |
| 1431 | &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE); |
| 1432 | } |
| 1433 | |
| 1434 | static int ioctl_deallocate_iso_resource_once(struct client *client, |
| 1435 | union ioctl_arg *arg) |
| 1436 | { |
| 1437 | return init_iso_resource(client, |
| 1438 | &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE); |
| 1439 | } |
| 1440 | |
| 1441 | /* |
| 1442 | * Returns a speed code: Maximum speed to or from this device, |
| 1443 | * limited by the device's link speed, the local node's link speed, |
| 1444 | * and all PHY port speeds between the two links. |
| 1445 | */ |
| 1446 | static int ioctl_get_speed(struct client *client, union ioctl_arg *arg) |
| 1447 | { |
| 1448 | return client->device->max_speed; |
| 1449 | } |
| 1450 | |
| 1451 | static int ioctl_send_broadcast_request(struct client *client, |
| 1452 | union ioctl_arg *arg) |
| 1453 | { |
| 1454 | struct fw_cdev_send_request *a = &arg->send_request; |
| 1455 | |
| 1456 | switch (a->tcode) { |
| 1457 | case TCODE_WRITE_QUADLET_REQUEST: |
| 1458 | case TCODE_WRITE_BLOCK_REQUEST: |
| 1459 | break; |
| 1460 | default: |
| 1461 | return -EINVAL; |
| 1462 | } |
| 1463 | |
| 1464 | /* Security policy: Only allow accesses to Units Space. */ |
| 1465 | if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END) |
| 1466 | return -EACCES; |
| 1467 | |
| 1468 | return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100); |
| 1469 | } |
| 1470 | |
| 1471 | static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg) |
| 1472 | { |
| 1473 | struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet; |
| 1474 | struct fw_cdev_send_request request; |
| 1475 | int dest; |
| 1476 | |
| 1477 | if (a->speed > client->device->card->link_speed || |
| 1478 | a->length > 1024 << a->speed) |
| 1479 | return -EIO; |
| 1480 | |
| 1481 | if (a->tag > 3 || a->channel > 63 || a->sy > 15) |
| 1482 | return -EINVAL; |
| 1483 | |
| 1484 | dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy); |
| 1485 | request.tcode = TCODE_STREAM_DATA; |
| 1486 | request.length = a->length; |
| 1487 | request.closure = a->closure; |
| 1488 | request.data = a->data; |
| 1489 | request.generation = a->generation; |
| 1490 | |
| 1491 | return init_request(client, &request, dest, a->speed); |
| 1492 | } |
| 1493 | |
| 1494 | static void outbound_phy_packet_callback(struct fw_packet *packet, |
| 1495 | struct fw_card *card, int status) |
| 1496 | { |
| 1497 | struct outbound_phy_packet_event *e = |
| 1498 | container_of(packet, struct outbound_phy_packet_event, p); |
| 1499 | |
| 1500 | switch (status) { |
| 1501 | /* expected: */ |
| 1502 | case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break; |
| 1503 | /* should never happen with PHY packets: */ |
| 1504 | case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break; |
| 1505 | case ACK_BUSY_X: |
| 1506 | case ACK_BUSY_A: |
| 1507 | case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break; |
| 1508 | case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break; |
| 1509 | case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break; |
| 1510 | /* stale generation; cancelled; on certain controllers: no ack */ |
| 1511 | default: e->phy_packet.rcode = status; break; |
| 1512 | } |
| 1513 | e->phy_packet.data[0] = packet->timestamp; |
| 1514 | |
| 1515 | queue_event(e->client, &e->event, &e->phy_packet, |
| 1516 | sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); |
| 1517 | client_put(e->client); |
| 1518 | } |
| 1519 | |
| 1520 | static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) |
| 1521 | { |
| 1522 | struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet; |
| 1523 | struct fw_card *card = client->device->card; |
| 1524 | struct outbound_phy_packet_event *e; |
| 1525 | |
| 1526 | /* Access policy: Allow this ioctl only on local nodes' device files. */ |
| 1527 | if (!client->device->is_local) |
| 1528 | return -ENOSYS; |
| 1529 | |
| 1530 | e = kzalloc(sizeof(*e) + 4, GFP_KERNEL); |
| 1531 | if (e == NULL) |
| 1532 | return -ENOMEM; |
| 1533 | |
| 1534 | client_get(client); |
| 1535 | e->client = client; |
| 1536 | e->p.speed = SCODE_100; |
| 1537 | e->p.generation = a->generation; |
| 1538 | e->p.header[0] = TCODE_LINK_INTERNAL << 4; |
| 1539 | e->p.header[1] = a->data[0]; |
| 1540 | e->p.header[2] = a->data[1]; |
| 1541 | e->p.header_length = 12; |
| 1542 | e->p.callback = outbound_phy_packet_callback; |
| 1543 | e->phy_packet.closure = a->closure; |
| 1544 | e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT; |
| 1545 | if (is_ping_packet(a->data)) |
| 1546 | e->phy_packet.length = 4; |
| 1547 | |
| 1548 | card->driver->send_request(card, &e->p); |
| 1549 | |
| 1550 | return 0; |
| 1551 | } |
| 1552 | |
| 1553 | static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg) |
| 1554 | { |
| 1555 | struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets; |
| 1556 | struct fw_card *card = client->device->card; |
| 1557 | |
| 1558 | /* Access policy: Allow this ioctl only on local nodes' device files. */ |
| 1559 | if (!client->device->is_local) |
| 1560 | return -ENOSYS; |
| 1561 | |
| 1562 | spin_lock_irq(&card->lock); |
| 1563 | |
| 1564 | list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list); |
| 1565 | client->phy_receiver_closure = a->closure; |
| 1566 | |
| 1567 | spin_unlock_irq(&card->lock); |
| 1568 | |
| 1569 | return 0; |
| 1570 | } |
| 1571 | |
| 1572 | void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p) |
| 1573 | { |
| 1574 | struct client *client; |
| 1575 | struct inbound_phy_packet_event *e; |
| 1576 | unsigned long flags; |
| 1577 | |
| 1578 | spin_lock_irqsave(&card->lock, flags); |
| 1579 | |
| 1580 | list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) { |
| 1581 | e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC); |
| 1582 | if (e == NULL) |
| 1583 | break; |
| 1584 | |
| 1585 | e->phy_packet.closure = client->phy_receiver_closure; |
| 1586 | e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED; |
| 1587 | e->phy_packet.rcode = RCODE_COMPLETE; |
| 1588 | e->phy_packet.length = 8; |
| 1589 | e->phy_packet.data[0] = p->header[1]; |
| 1590 | e->phy_packet.data[1] = p->header[2]; |
| 1591 | queue_event(client, &e->event, |
| 1592 | &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0); |
| 1593 | } |
| 1594 | |
| 1595 | spin_unlock_irqrestore(&card->lock, flags); |
| 1596 | } |
| 1597 | |
| 1598 | static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = { |
| 1599 | [0x00] = ioctl_get_info, |
| 1600 | [0x01] = ioctl_send_request, |
| 1601 | [0x02] = ioctl_allocate, |
| 1602 | [0x03] = ioctl_deallocate, |
| 1603 | [0x04] = ioctl_send_response, |
| 1604 | [0x05] = ioctl_initiate_bus_reset, |
| 1605 | [0x06] = ioctl_add_descriptor, |
| 1606 | [0x07] = ioctl_remove_descriptor, |
| 1607 | [0x08] = ioctl_create_iso_context, |
| 1608 | [0x09] = ioctl_queue_iso, |
| 1609 | [0x0a] = ioctl_start_iso, |
| 1610 | [0x0b] = ioctl_stop_iso, |
| 1611 | [0x0c] = ioctl_get_cycle_timer, |
| 1612 | [0x0d] = ioctl_allocate_iso_resource, |
| 1613 | [0x0e] = ioctl_deallocate_iso_resource, |
| 1614 | [0x0f] = ioctl_allocate_iso_resource_once, |
| 1615 | [0x10] = ioctl_deallocate_iso_resource_once, |
| 1616 | [0x11] = ioctl_get_speed, |
| 1617 | [0x12] = ioctl_send_broadcast_request, |
| 1618 | [0x13] = ioctl_send_stream_packet, |
| 1619 | [0x14] = ioctl_get_cycle_timer2, |
| 1620 | [0x15] = ioctl_send_phy_packet, |
| 1621 | [0x16] = ioctl_receive_phy_packets, |
| 1622 | [0x17] = ioctl_set_iso_channels, |
| 1623 | [0x18] = ioctl_flush_iso, |
| 1624 | }; |
| 1625 | |
| 1626 | static int dispatch_ioctl(struct client *client, |
| 1627 | unsigned int cmd, void __user *arg) |
| 1628 | { |
| 1629 | union ioctl_arg buffer; |
| 1630 | int ret; |
| 1631 | |
| 1632 | if (fw_device_is_shutdown(client->device)) |
| 1633 | return -ENODEV; |
| 1634 | |
| 1635 | if (_IOC_TYPE(cmd) != '#' || |
| 1636 | _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) || |
| 1637 | _IOC_SIZE(cmd) > sizeof(buffer)) |
| 1638 | return -ENOTTY; |
| 1639 | |
| 1640 | memset(&buffer, 0, sizeof(buffer)); |
| 1641 | |
| 1642 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
| 1643 | if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd))) |
| 1644 | return -EFAULT; |
| 1645 | |
| 1646 | ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer); |
| 1647 | if (ret < 0) |
| 1648 | return ret; |
| 1649 | |
| 1650 | if (_IOC_DIR(cmd) & _IOC_READ) |
| 1651 | if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd))) |
| 1652 | return -EFAULT; |
| 1653 | |
| 1654 | return ret; |
| 1655 | } |
| 1656 | |
| 1657 | static long fw_device_op_ioctl(struct file *file, |
| 1658 | unsigned int cmd, unsigned long arg) |
| 1659 | { |
| 1660 | return dispatch_ioctl(file->private_data, cmd, (void __user *)arg); |
| 1661 | } |
| 1662 | |
| 1663 | #ifdef CONFIG_COMPAT |
| 1664 | static long fw_device_op_compat_ioctl(struct file *file, |
| 1665 | unsigned int cmd, unsigned long arg) |
| 1666 | { |
| 1667 | return dispatch_ioctl(file->private_data, cmd, compat_ptr(arg)); |
| 1668 | } |
| 1669 | #endif |
| 1670 | |
| 1671 | static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) |
| 1672 | { |
| 1673 | struct client *client = file->private_data; |
| 1674 | unsigned long size; |
| 1675 | int page_count, ret; |
| 1676 | |
| 1677 | if (fw_device_is_shutdown(client->device)) |
| 1678 | return -ENODEV; |
| 1679 | |
| 1680 | /* FIXME: We could support multiple buffers, but we don't. */ |
| 1681 | if (client->buffer.pages != NULL) |
| 1682 | return -EBUSY; |
| 1683 | |
| 1684 | if (!(vma->vm_flags & VM_SHARED)) |
| 1685 | return -EINVAL; |
| 1686 | |
| 1687 | if (vma->vm_start & ~PAGE_MASK) |
| 1688 | return -EINVAL; |
| 1689 | |
| 1690 | client->vm_start = vma->vm_start; |
| 1691 | size = vma->vm_end - vma->vm_start; |
| 1692 | page_count = size >> PAGE_SHIFT; |
| 1693 | if (size & ~PAGE_MASK) |
| 1694 | return -EINVAL; |
| 1695 | |
| 1696 | ret = fw_iso_buffer_alloc(&client->buffer, page_count); |
| 1697 | if (ret < 0) |
| 1698 | return ret; |
| 1699 | |
| 1700 | spin_lock_irq(&client->lock); |
| 1701 | if (client->iso_context) { |
| 1702 | ret = fw_iso_buffer_map_dma(&client->buffer, |
| 1703 | client->device->card, |
| 1704 | iso_dma_direction(client->iso_context)); |
| 1705 | client->buffer_is_mapped = (ret == 0); |
| 1706 | } |
| 1707 | spin_unlock_irq(&client->lock); |
| 1708 | if (ret < 0) |
| 1709 | goto fail; |
| 1710 | |
| 1711 | ret = fw_iso_buffer_map_vma(&client->buffer, vma); |
| 1712 | if (ret < 0) |
| 1713 | goto fail; |
| 1714 | |
| 1715 | return 0; |
| 1716 | fail: |
| 1717 | fw_iso_buffer_destroy(&client->buffer, client->device->card); |
| 1718 | return ret; |
| 1719 | } |
| 1720 | |
| 1721 | static int is_outbound_transaction_resource(int id, void *p, void *data) |
| 1722 | { |
| 1723 | struct client_resource *resource = p; |
| 1724 | |
| 1725 | return resource->release == release_transaction; |
| 1726 | } |
| 1727 | |
| 1728 | static int has_outbound_transactions(struct client *client) |
| 1729 | { |
| 1730 | int ret; |
| 1731 | |
| 1732 | spin_lock_irq(&client->lock); |
| 1733 | ret = idr_for_each(&client->resource_idr, |
| 1734 | is_outbound_transaction_resource, NULL); |
| 1735 | spin_unlock_irq(&client->lock); |
| 1736 | |
| 1737 | return ret; |
| 1738 | } |
| 1739 | |
| 1740 | static int shutdown_resource(int id, void *p, void *data) |
| 1741 | { |
| 1742 | struct client_resource *resource = p; |
| 1743 | struct client *client = data; |
| 1744 | |
| 1745 | resource->release(client, resource); |
| 1746 | client_put(client); |
| 1747 | |
| 1748 | return 0; |
| 1749 | } |
| 1750 | |
| 1751 | static int fw_device_op_release(struct inode *inode, struct file *file) |
| 1752 | { |
| 1753 | struct client *client = file->private_data; |
| 1754 | struct event *event, *next_event; |
| 1755 | |
| 1756 | spin_lock_irq(&client->device->card->lock); |
| 1757 | list_del(&client->phy_receiver_link); |
| 1758 | spin_unlock_irq(&client->device->card->lock); |
| 1759 | |
| 1760 | mutex_lock(&client->device->client_list_mutex); |
| 1761 | list_del(&client->link); |
| 1762 | mutex_unlock(&client->device->client_list_mutex); |
| 1763 | |
| 1764 | if (client->iso_context) |
| 1765 | fw_iso_context_destroy(client->iso_context); |
| 1766 | |
| 1767 | if (client->buffer.pages) |
| 1768 | fw_iso_buffer_destroy(&client->buffer, client->device->card); |
| 1769 | |
| 1770 | /* Freeze client->resource_idr and client->event_list */ |
| 1771 | spin_lock_irq(&client->lock); |
| 1772 | client->in_shutdown = true; |
| 1773 | spin_unlock_irq(&client->lock); |
| 1774 | |
| 1775 | wait_event(client->tx_flush_wait, !has_outbound_transactions(client)); |
| 1776 | |
| 1777 | idr_for_each(&client->resource_idr, shutdown_resource, client); |
| 1778 | idr_destroy(&client->resource_idr); |
| 1779 | |
| 1780 | list_for_each_entry_safe(event, next_event, &client->event_list, link) |
| 1781 | kfree(event); |
| 1782 | |
| 1783 | client_put(client); |
| 1784 | |
| 1785 | return 0; |
| 1786 | } |
| 1787 | |
| 1788 | static unsigned int fw_device_op_poll(struct file *file, poll_table * pt) |
| 1789 | { |
| 1790 | struct client *client = file->private_data; |
| 1791 | unsigned int mask = 0; |
| 1792 | |
| 1793 | poll_wait(file, &client->wait, pt); |
| 1794 | |
| 1795 | if (fw_device_is_shutdown(client->device)) |
| 1796 | mask |= POLLHUP | POLLERR; |
| 1797 | if (!list_empty(&client->event_list)) |
| 1798 | mask |= POLLIN | POLLRDNORM; |
| 1799 | |
| 1800 | return mask; |
| 1801 | } |
| 1802 | |
| 1803 | const struct file_operations fw_device_ops = { |
| 1804 | .owner = THIS_MODULE, |
| 1805 | .llseek = no_llseek, |
| 1806 | .open = fw_device_op_open, |
| 1807 | .read = fw_device_op_read, |
| 1808 | .unlocked_ioctl = fw_device_op_ioctl, |
| 1809 | .mmap = fw_device_op_mmap, |
| 1810 | .release = fw_device_op_release, |
| 1811 | .poll = fw_device_op_poll, |
| 1812 | #ifdef CONFIG_COMPAT |
| 1813 | .compat_ioctl = fw_device_op_compat_ioctl, |
| 1814 | #endif |
| 1815 | }; |