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/errno.h> 26 #include <linux/firewire.h> 27 #include <linux/firewire-cdev.h> 28 #include <linux/idr.h> 29 #include <linux/irqflags.h> 30 #include <linux/jiffies.h> 31 #include <linux/kernel.h> 32 #include <linux/kref.h> 33 #include <linux/mm.h> 34 #include <linux/module.h> 35 #include <linux/mutex.h> 36 #include <linux/poll.h> 37 #include <linux/sched.h> /* required for linux/wait.h */ 38 #include <linux/slab.h> 39 #include <linux/spinlock.h> 40 #include <linux/string.h> 41 #include <linux/time.h> 42 #include <linux/uaccess.h> 43 #include <linux/vmalloc.h> 44 #include <linux/wait.h> 45 #include <linux/workqueue.h> 46 47 #include <asm/system.h> 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 4 55 #define FW_CDEV_VERSION_EVENT_REQUEST2 4 56 #define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 57 58 struct client { 59 u32 version; 60 struct fw_device *device; 61 62 spinlock_t lock; 63 bool in_shutdown; 64 struct idr resource_idr; 65 struct list_head event_list; 66 wait_queue_head_t wait; 67 wait_queue_head_t tx_flush_wait; 68 u64 bus_reset_closure; 69 70 struct fw_iso_context *iso_context; 71 u64 iso_closure; 72 struct fw_iso_buffer buffer; 73 unsigned long vm_start; 74 75 struct list_head phy_receiver_link; 76 u64 phy_receiver_closure; 77 78 struct list_head link; 79 struct kref kref; 80 }; 81 82 static inline void client_get(struct client *client) 83 { 84 kref_get(&client->kref); 85 } 86 87 static void client_release(struct kref *kref) 88 { 89 struct client *client = container_of(kref, struct client, kref); 90 91 fw_device_put(client->device); 92 kfree(client); 93 } 94 95 static void client_put(struct client *client) 96 { 97 kref_put(&client->kref, client_release); 98 } 99 100 struct client_resource; 101 typedef void (*client_resource_release_fn_t)(struct client *, 102 struct client_resource *); 103 struct client_resource { 104 client_resource_release_fn_t release; 105 int handle; 106 }; 107 108 struct address_handler_resource { 109 struct client_resource resource; 110 struct fw_address_handler handler; 111 __u64 closure; 112 struct client *client; 113 }; 114 115 struct outbound_transaction_resource { 116 struct client_resource resource; 117 struct fw_transaction transaction; 118 }; 119 120 struct inbound_transaction_resource { 121 struct client_resource resource; 122 struct fw_card *card; 123 struct fw_request *request; 124 void *data; 125 size_t length; 126 }; 127 128 struct descriptor_resource { 129 struct client_resource resource; 130 struct fw_descriptor descriptor; 131 u32 data[0]; 132 }; 133 134 struct iso_resource { 135 struct client_resource resource; 136 struct client *client; 137 /* Schedule work and access todo only with client->lock held. */ 138 struct delayed_work work; 139 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC, 140 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo; 141 int generation; 142 u64 channels; 143 s32 bandwidth; 144 __be32 transaction_data[2]; 145 struct iso_resource_event *e_alloc, *e_dealloc; 146 }; 147 148 static void release_iso_resource(struct client *, struct client_resource *); 149 150 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay) 151 { 152 client_get(r->client); 153 if (!schedule_delayed_work(&r->work, delay)) 154 client_put(r->client); 155 } 156 157 static void schedule_if_iso_resource(struct client_resource *resource) 158 { 159 if (resource->release == release_iso_resource) 160 schedule_iso_resource(container_of(resource, 161 struct iso_resource, resource), 0); 162 } 163 164 /* 165 * dequeue_event() just kfree()'s the event, so the event has to be 166 * the first field in a struct XYZ_event. 167 */ 168 struct event { 169 struct { void *data; size_t size; } v[2]; 170 struct list_head link; 171 }; 172 173 struct bus_reset_event { 174 struct event event; 175 struct fw_cdev_event_bus_reset reset; 176 }; 177 178 struct outbound_transaction_event { 179 struct event event; 180 struct client *client; 181 struct outbound_transaction_resource r; 182 struct fw_cdev_event_response response; 183 }; 184 185 struct inbound_transaction_event { 186 struct event event; 187 union { 188 struct fw_cdev_event_request request; 189 struct fw_cdev_event_request2 request2; 190 } req; 191 }; 192 193 struct iso_interrupt_event { 194 struct event event; 195 struct fw_cdev_event_iso_interrupt interrupt; 196 }; 197 198 struct iso_interrupt_mc_event { 199 struct event event; 200 struct fw_cdev_event_iso_interrupt_mc interrupt; 201 }; 202 203 struct iso_resource_event { 204 struct event event; 205 struct fw_cdev_event_iso_resource iso_resource; 206 }; 207 208 struct outbound_phy_packet_event { 209 struct event event; 210 struct client *client; 211 struct fw_packet p; 212 struct fw_cdev_event_phy_packet phy_packet; 213 }; 214 215 struct inbound_phy_packet_event { 216 struct event event; 217 struct fw_cdev_event_phy_packet phy_packet; 218 }; 219 220 static inline void __user *u64_to_uptr(__u64 value) 221 { 222 return (void __user *)(unsigned long)value; 223 } 224 225 static inline __u64 uptr_to_u64(void __user *ptr) 226 { 227 return (__u64)(unsigned long)ptr; 228 } 229 230 static int fw_device_op_open(struct inode *inode, struct file *file) 231 { 232 struct fw_device *device; 233 struct client *client; 234 235 device = fw_device_get_by_devt(inode->i_rdev); 236 if (device == NULL) 237 return -ENODEV; 238 239 if (fw_device_is_shutdown(device)) { 240 fw_device_put(device); 241 return -ENODEV; 242 } 243 244 client = kzalloc(sizeof(*client), GFP_KERNEL); 245 if (client == NULL) { 246 fw_device_put(device); 247 return -ENOMEM; 248 } 249 250 client->device = device; 251 spin_lock_init(&client->lock); 252 idr_init(&client->resource_idr); 253 INIT_LIST_HEAD(&client->event_list); 254 init_waitqueue_head(&client->wait); 255 init_waitqueue_head(&client->tx_flush_wait); 256 INIT_LIST_HEAD(&client->phy_receiver_link); 257 kref_init(&client->kref); 258 259 file->private_data = client; 260 261 mutex_lock(&device->client_list_mutex); 262 list_add_tail(&client->link, &device->client_list); 263 mutex_unlock(&device->client_list_mutex); 264 265 return nonseekable_open(inode, file); 266 } 267 268 static void queue_event(struct client *client, struct event *event, 269 void *data0, size_t size0, void *data1, size_t size1) 270 { 271 unsigned long flags; 272 273 event->v[0].data = data0; 274 event->v[0].size = size0; 275 event->v[1].data = data1; 276 event->v[1].size = size1; 277 278 spin_lock_irqsave(&client->lock, flags); 279 if (client->in_shutdown) 280 kfree(event); 281 else 282 list_add_tail(&event->link, &client->event_list); 283 spin_unlock_irqrestore(&client->lock, flags); 284 285 wake_up_interruptible(&client->wait); 286 } 287 288 static int dequeue_event(struct client *client, 289 char __user *buffer, size_t count) 290 { 291 struct event *event; 292 size_t size, total; 293 int i, ret; 294 295 ret = wait_event_interruptible(client->wait, 296 !list_empty(&client->event_list) || 297 fw_device_is_shutdown(client->device)); 298 if (ret < 0) 299 return ret; 300 301 if (list_empty(&client->event_list) && 302 fw_device_is_shutdown(client->device)) 303 return -ENODEV; 304 305 spin_lock_irq(&client->lock); 306 event = list_first_entry(&client->event_list, struct event, link); 307 list_del(&event->link); 308 spin_unlock_irq(&client->lock); 309 310 total = 0; 311 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { 312 size = min(event->v[i].size, count - total); 313 if (copy_to_user(buffer + total, event->v[i].data, size)) { 314 ret = -EFAULT; 315 goto out; 316 } 317 total += size; 318 } 319 ret = total; 320 321 out: 322 kfree(event); 323 324 return ret; 325 } 326 327 static ssize_t fw_device_op_read(struct file *file, char __user *buffer, 328 size_t count, loff_t *offset) 329 { 330 struct client *client = file->private_data; 331 332 return dequeue_event(client, buffer, count); 333 } 334 335 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, 336 struct client *client) 337 { 338 struct fw_card *card = client->device->card; 339 340 spin_lock_irq(&card->lock); 341 342 event->closure = client->bus_reset_closure; 343 event->type = FW_CDEV_EVENT_BUS_RESET; 344 event->generation = client->device->generation; 345 event->node_id = client->device->node_id; 346 event->local_node_id = card->local_node->node_id; 347 event->bm_node_id = card->bm_node_id; 348 event->irm_node_id = card->irm_node->node_id; 349 event->root_node_id = card->root_node->node_id; 350 351 spin_unlock_irq(&card->lock); 352 } 353 354 static void for_each_client(struct fw_device *device, 355 void (*callback)(struct client *client)) 356 { 357 struct client *c; 358 359 mutex_lock(&device->client_list_mutex); 360 list_for_each_entry(c, &device->client_list, link) 361 callback(c); 362 mutex_unlock(&device->client_list_mutex); 363 } 364 365 static int schedule_reallocations(int id, void *p, void *data) 366 { 367 schedule_if_iso_resource(p); 368 369 return 0; 370 } 371 372 static void queue_bus_reset_event(struct client *client) 373 { 374 struct bus_reset_event *e; 375 376 e = kzalloc(sizeof(*e), GFP_KERNEL); 377 if (e == NULL) { 378 fw_notify("Out of memory when allocating event\n"); 379 return; 380 } 381 382 fill_bus_reset_event(&e->reset, client); 383 384 queue_event(client, &e->event, 385 &e->reset, sizeof(e->reset), NULL, 0); 386 387 spin_lock_irq(&client->lock); 388 idr_for_each(&client->resource_idr, schedule_reallocations, client); 389 spin_unlock_irq(&client->lock); 390 } 391 392 void fw_device_cdev_update(struct fw_device *device) 393 { 394 for_each_client(device, queue_bus_reset_event); 395 } 396 397 static void wake_up_client(struct client *client) 398 { 399 wake_up_interruptible(&client->wait); 400 } 401 402 void fw_device_cdev_remove(struct fw_device *device) 403 { 404 for_each_client(device, wake_up_client); 405 } 406 407 union ioctl_arg { 408 struct fw_cdev_get_info get_info; 409 struct fw_cdev_send_request send_request; 410 struct fw_cdev_allocate allocate; 411 struct fw_cdev_deallocate deallocate; 412 struct fw_cdev_send_response send_response; 413 struct fw_cdev_initiate_bus_reset initiate_bus_reset; 414 struct fw_cdev_add_descriptor add_descriptor; 415 struct fw_cdev_remove_descriptor remove_descriptor; 416 struct fw_cdev_create_iso_context create_iso_context; 417 struct fw_cdev_queue_iso queue_iso; 418 struct fw_cdev_start_iso start_iso; 419 struct fw_cdev_stop_iso stop_iso; 420 struct fw_cdev_get_cycle_timer get_cycle_timer; 421 struct fw_cdev_allocate_iso_resource allocate_iso_resource; 422 struct fw_cdev_send_stream_packet send_stream_packet; 423 struct fw_cdev_get_cycle_timer2 get_cycle_timer2; 424 struct fw_cdev_send_phy_packet send_phy_packet; 425 struct fw_cdev_receive_phy_packets receive_phy_packets; 426 struct fw_cdev_set_iso_channels set_iso_channels; 427 }; 428 429 static int ioctl_get_info(struct client *client, union ioctl_arg *arg) 430 { 431 struct fw_cdev_get_info *a = &arg->get_info; 432 struct fw_cdev_event_bus_reset bus_reset; 433 unsigned long ret = 0; 434 435 client->version = a->version; 436 a->version = FW_CDEV_KERNEL_VERSION; 437 a->card = client->device->card->index; 438 439 down_read(&fw_device_rwsem); 440 441 if (a->rom != 0) { 442 size_t want = a->rom_length; 443 size_t have = client->device->config_rom_length * 4; 444 445 ret = copy_to_user(u64_to_uptr(a->rom), 446 client->device->config_rom, min(want, have)); 447 } 448 a->rom_length = client->device->config_rom_length * 4; 449 450 up_read(&fw_device_rwsem); 451 452 if (ret != 0) 453 return -EFAULT; 454 455 client->bus_reset_closure = a->bus_reset_closure; 456 if (a->bus_reset != 0) { 457 fill_bus_reset_event(&bus_reset, client); 458 if (copy_to_user(u64_to_uptr(a->bus_reset), 459 &bus_reset, sizeof(bus_reset))) 460 return -EFAULT; 461 } 462 463 return 0; 464 } 465 466 static int add_client_resource(struct client *client, 467 struct client_resource *resource, gfp_t gfp_mask) 468 { 469 unsigned long flags; 470 int ret; 471 472 retry: 473 if (idr_pre_get(&client->resource_idr, gfp_mask) == 0) 474 return -ENOMEM; 475 476 spin_lock_irqsave(&client->lock, flags); 477 if (client->in_shutdown) 478 ret = -ECANCELED; 479 else 480 ret = idr_get_new(&client->resource_idr, resource, 481 &resource->handle); 482 if (ret >= 0) { 483 client_get(client); 484 schedule_if_iso_resource(resource); 485 } 486 spin_unlock_irqrestore(&client->lock, flags); 487 488 if (ret == -EAGAIN) 489 goto retry; 490 491 return ret < 0 ? ret : 0; 492 } 493 494 static int release_client_resource(struct client *client, u32 handle, 495 client_resource_release_fn_t release, 496 struct client_resource **return_resource) 497 { 498 struct client_resource *resource; 499 500 spin_lock_irq(&client->lock); 501 if (client->in_shutdown) 502 resource = NULL; 503 else 504 resource = idr_find(&client->resource_idr, handle); 505 if (resource && resource->release == release) 506 idr_remove(&client->resource_idr, handle); 507 spin_unlock_irq(&client->lock); 508 509 if (!(resource && resource->release == release)) 510 return -EINVAL; 511 512 if (return_resource) 513 *return_resource = resource; 514 else 515 resource->release(client, resource); 516 517 client_put(client); 518 519 return 0; 520 } 521 522 static void release_transaction(struct client *client, 523 struct client_resource *resource) 524 { 525 } 526 527 static void complete_transaction(struct fw_card *card, int rcode, 528 void *payload, size_t length, void *data) 529 { 530 struct outbound_transaction_event *e = data; 531 struct fw_cdev_event_response *rsp = &e->response; 532 struct client *client = e->client; 533 unsigned long flags; 534 535 if (length < rsp->length) 536 rsp->length = length; 537 if (rcode == RCODE_COMPLETE) 538 memcpy(rsp->data, payload, rsp->length); 539 540 spin_lock_irqsave(&client->lock, flags); 541 idr_remove(&client->resource_idr, e->r.resource.handle); 542 if (client->in_shutdown) 543 wake_up(&client->tx_flush_wait); 544 spin_unlock_irqrestore(&client->lock, flags); 545 546 rsp->type = FW_CDEV_EVENT_RESPONSE; 547 rsp->rcode = rcode; 548 549 /* 550 * In the case that sizeof(*rsp) doesn't align with the position of the 551 * data, and the read is short, preserve an extra copy of the data 552 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless 553 * for short reads and some apps depended on it, this is both safe 554 * and prudent for compatibility. 555 */ 556 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data)) 557 queue_event(client, &e->event, rsp, sizeof(*rsp), 558 rsp->data, rsp->length); 559 else 560 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, 561 NULL, 0); 562 563 /* Drop the idr's reference */ 564 client_put(client); 565 } 566 567 static int init_request(struct client *client, 568 struct fw_cdev_send_request *request, 569 int destination_id, int speed) 570 { 571 struct outbound_transaction_event *e; 572 int ret; 573 574 if (request->tcode != TCODE_STREAM_DATA && 575 (request->length > 4096 || request->length > 512 << speed)) 576 return -EIO; 577 578 if (request->tcode == TCODE_WRITE_QUADLET_REQUEST && 579 request->length < 4) 580 return -EINVAL; 581 582 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL); 583 if (e == NULL) 584 return -ENOMEM; 585 586 e->client = client; 587 e->response.length = request->length; 588 e->response.closure = request->closure; 589 590 if (request->data && 591 copy_from_user(e->response.data, 592 u64_to_uptr(request->data), request->length)) { 593 ret = -EFAULT; 594 goto failed; 595 } 596 597 e->r.resource.release = release_transaction; 598 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL); 599 if (ret < 0) 600 goto failed; 601 602 fw_send_request(client->device->card, &e->r.transaction, 603 request->tcode, destination_id, request->generation, 604 speed, request->offset, e->response.data, 605 request->length, complete_transaction, e); 606 return 0; 607 608 failed: 609 kfree(e); 610 611 return ret; 612 } 613 614 static int ioctl_send_request(struct client *client, union ioctl_arg *arg) 615 { 616 switch (arg->send_request.tcode) { 617 case TCODE_WRITE_QUADLET_REQUEST: 618 case TCODE_WRITE_BLOCK_REQUEST: 619 case TCODE_READ_QUADLET_REQUEST: 620 case TCODE_READ_BLOCK_REQUEST: 621 case TCODE_LOCK_MASK_SWAP: 622 case TCODE_LOCK_COMPARE_SWAP: 623 case TCODE_LOCK_FETCH_ADD: 624 case TCODE_LOCK_LITTLE_ADD: 625 case TCODE_LOCK_BOUNDED_ADD: 626 case TCODE_LOCK_WRAP_ADD: 627 case TCODE_LOCK_VENDOR_DEPENDENT: 628 break; 629 default: 630 return -EINVAL; 631 } 632 633 return init_request(client, &arg->send_request, client->device->node_id, 634 client->device->max_speed); 635 } 636 637 static inline bool is_fcp_request(struct fw_request *request) 638 { 639 return request == NULL; 640 } 641 642 static void release_request(struct client *client, 643 struct client_resource *resource) 644 { 645 struct inbound_transaction_resource *r = container_of(resource, 646 struct inbound_transaction_resource, resource); 647 648 if (is_fcp_request(r->request)) 649 kfree(r->data); 650 else 651 fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR); 652 653 fw_card_put(r->card); 654 kfree(r); 655 } 656 657 static void handle_request(struct fw_card *card, struct fw_request *request, 658 int tcode, int destination, int source, 659 int generation, unsigned long long offset, 660 void *payload, size_t length, void *callback_data) 661 { 662 struct address_handler_resource *handler = callback_data; 663 struct inbound_transaction_resource *r; 664 struct inbound_transaction_event *e; 665 size_t event_size0; 666 void *fcp_frame = NULL; 667 int ret; 668 669 /* card may be different from handler->client->device->card */ 670 fw_card_get(card); 671 672 r = kmalloc(sizeof(*r), GFP_ATOMIC); 673 e = kmalloc(sizeof(*e), GFP_ATOMIC); 674 if (r == NULL || e == NULL) { 675 fw_notify("Out of memory when allocating event\n"); 676 goto failed; 677 } 678 r->card = card; 679 r->request = request; 680 r->data = payload; 681 r->length = length; 682 683 if (is_fcp_request(request)) { 684 /* 685 * FIXME: Let core-transaction.c manage a 686 * single reference-counted copy? 687 */ 688 fcp_frame = kmemdup(payload, length, GFP_ATOMIC); 689 if (fcp_frame == NULL) 690 goto failed; 691 692 r->data = fcp_frame; 693 } 694 695 r->resource.release = release_request; 696 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC); 697 if (ret < 0) 698 goto failed; 699 700 if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) { 701 struct fw_cdev_event_request *req = &e->req.request; 702 703 if (tcode & 0x10) 704 tcode = TCODE_LOCK_REQUEST; 705 706 req->type = FW_CDEV_EVENT_REQUEST; 707 req->tcode = tcode; 708 req->offset = offset; 709 req->length = length; 710 req->handle = r->resource.handle; 711 req->closure = handler->closure; 712 event_size0 = sizeof(*req); 713 } else { 714 struct fw_cdev_event_request2 *req = &e->req.request2; 715 716 req->type = FW_CDEV_EVENT_REQUEST2; 717 req->tcode = tcode; 718 req->offset = offset; 719 req->source_node_id = source; 720 req->destination_node_id = destination; 721 req->card = card->index; 722 req->generation = generation; 723 req->length = length; 724 req->handle = r->resource.handle; 725 req->closure = handler->closure; 726 event_size0 = sizeof(*req); 727 } 728 729 queue_event(handler->client, &e->event, 730 &e->req, event_size0, r->data, length); 731 return; 732 733 failed: 734 kfree(r); 735 kfree(e); 736 kfree(fcp_frame); 737 738 if (!is_fcp_request(request)) 739 fw_send_response(card, request, RCODE_CONFLICT_ERROR); 740 741 fw_card_put(card); 742 } 743 744 static void release_address_handler(struct client *client, 745 struct client_resource *resource) 746 { 747 struct address_handler_resource *r = 748 container_of(resource, struct address_handler_resource, resource); 749 750 fw_core_remove_address_handler(&r->handler); 751 kfree(r); 752 } 753 754 static int ioctl_allocate(struct client *client, union ioctl_arg *arg) 755 { 756 struct fw_cdev_allocate *a = &arg->allocate; 757 struct address_handler_resource *r; 758 struct fw_address_region region; 759 int ret; 760 761 r = kmalloc(sizeof(*r), GFP_KERNEL); 762 if (r == NULL) 763 return -ENOMEM; 764 765 region.start = a->offset; 766 if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END) 767 region.end = a->offset + a->length; 768 else 769 region.end = a->region_end; 770 771 r->handler.length = a->length; 772 r->handler.address_callback = handle_request; 773 r->handler.callback_data = r; 774 r->closure = a->closure; 775 r->client = client; 776 777 ret = fw_core_add_address_handler(&r->handler, ®ion); 778 if (ret < 0) { 779 kfree(r); 780 return ret; 781 } 782 a->offset = r->handler.offset; 783 784 r->resource.release = release_address_handler; 785 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 786 if (ret < 0) { 787 release_address_handler(client, &r->resource); 788 return ret; 789 } 790 a->handle = r->resource.handle; 791 792 return 0; 793 } 794 795 static int ioctl_deallocate(struct client *client, union ioctl_arg *arg) 796 { 797 return release_client_resource(client, arg->deallocate.handle, 798 release_address_handler, NULL); 799 } 800 801 static int ioctl_send_response(struct client *client, union ioctl_arg *arg) 802 { 803 struct fw_cdev_send_response *a = &arg->send_response; 804 struct client_resource *resource; 805 struct inbound_transaction_resource *r; 806 int ret = 0; 807 808 if (release_client_resource(client, a->handle, 809 release_request, &resource) < 0) 810 return -EINVAL; 811 812 r = container_of(resource, struct inbound_transaction_resource, 813 resource); 814 if (is_fcp_request(r->request)) 815 goto out; 816 817 if (a->length != fw_get_response_length(r->request)) { 818 ret = -EINVAL; 819 kfree(r->request); 820 goto out; 821 } 822 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) { 823 ret = -EFAULT; 824 kfree(r->request); 825 goto out; 826 } 827 fw_send_response(r->card, r->request, a->rcode); 828 out: 829 fw_card_put(r->card); 830 kfree(r); 831 832 return ret; 833 } 834 835 static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg) 836 { 837 fw_schedule_bus_reset(client->device->card, true, 838 arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET); 839 return 0; 840 } 841 842 static void release_descriptor(struct client *client, 843 struct client_resource *resource) 844 { 845 struct descriptor_resource *r = 846 container_of(resource, struct descriptor_resource, resource); 847 848 fw_core_remove_descriptor(&r->descriptor); 849 kfree(r); 850 } 851 852 static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg) 853 { 854 struct fw_cdev_add_descriptor *a = &arg->add_descriptor; 855 struct descriptor_resource *r; 856 int ret; 857 858 /* Access policy: Allow this ioctl only on local nodes' device files. */ 859 if (!client->device->is_local) 860 return -ENOSYS; 861 862 if (a->length > 256) 863 return -EINVAL; 864 865 r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL); 866 if (r == NULL) 867 return -ENOMEM; 868 869 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) { 870 ret = -EFAULT; 871 goto failed; 872 } 873 874 r->descriptor.length = a->length; 875 r->descriptor.immediate = a->immediate; 876 r->descriptor.key = a->key; 877 r->descriptor.data = r->data; 878 879 ret = fw_core_add_descriptor(&r->descriptor); 880 if (ret < 0) 881 goto failed; 882 883 r->resource.release = release_descriptor; 884 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 885 if (ret < 0) { 886 fw_core_remove_descriptor(&r->descriptor); 887 goto failed; 888 } 889 a->handle = r->resource.handle; 890 891 return 0; 892 failed: 893 kfree(r); 894 895 return ret; 896 } 897 898 static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg) 899 { 900 return release_client_resource(client, arg->remove_descriptor.handle, 901 release_descriptor, NULL); 902 } 903 904 static void iso_callback(struct fw_iso_context *context, u32 cycle, 905 size_t header_length, void *header, void *data) 906 { 907 struct client *client = data; 908 struct iso_interrupt_event *e; 909 910 e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC); 911 if (e == NULL) { 912 fw_notify("Out of memory when allocating event\n"); 913 return; 914 } 915 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; 916 e->interrupt.closure = client->iso_closure; 917 e->interrupt.cycle = cycle; 918 e->interrupt.header_length = header_length; 919 memcpy(e->interrupt.header, header, header_length); 920 queue_event(client, &e->event, &e->interrupt, 921 sizeof(e->interrupt) + header_length, NULL, 0); 922 } 923 924 static void iso_mc_callback(struct fw_iso_context *context, 925 dma_addr_t completed, void *data) 926 { 927 struct client *client = data; 928 struct iso_interrupt_mc_event *e; 929 930 e = kmalloc(sizeof(*e), GFP_ATOMIC); 931 if (e == NULL) { 932 fw_notify("Out of memory when allocating event\n"); 933 return; 934 } 935 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL; 936 e->interrupt.closure = client->iso_closure; 937 e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer, 938 completed); 939 queue_event(client, &e->event, &e->interrupt, 940 sizeof(e->interrupt), NULL, 0); 941 } 942 943 static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) 944 { 945 struct fw_cdev_create_iso_context *a = &arg->create_iso_context; 946 struct fw_iso_context *context; 947 fw_iso_callback_t cb; 948 949 BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT || 950 FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE || 951 FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL != 952 FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL); 953 954 switch (a->type) { 955 case FW_ISO_CONTEXT_TRANSMIT: 956 if (a->speed > SCODE_3200 || a->channel > 63) 957 return -EINVAL; 958 959 cb = iso_callback; 960 break; 961 962 case FW_ISO_CONTEXT_RECEIVE: 963 if (a->header_size < 4 || (a->header_size & 3) || 964 a->channel > 63) 965 return -EINVAL; 966 967 cb = iso_callback; 968 break; 969 970 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: 971 cb = (fw_iso_callback_t)iso_mc_callback; 972 break; 973 974 default: 975 return -EINVAL; 976 } 977 978 context = fw_iso_context_create(client->device->card, a->type, 979 a->channel, a->speed, a->header_size, cb, client); 980 if (IS_ERR(context)) 981 return PTR_ERR(context); 982 983 /* We only support one context at this time. */ 984 spin_lock_irq(&client->lock); 985 if (client->iso_context != NULL) { 986 spin_unlock_irq(&client->lock); 987 fw_iso_context_destroy(context); 988 return -EBUSY; 989 } 990 client->iso_closure = a->closure; 991 client->iso_context = context; 992 spin_unlock_irq(&client->lock); 993 994 a->handle = 0; 995 996 return 0; 997 } 998 999 static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg) 1000 { 1001 struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels; 1002 struct fw_iso_context *ctx = client->iso_context; 1003 1004 if (ctx == NULL || a->handle != 0) 1005 return -EINVAL; 1006 1007 return fw_iso_context_set_channels(ctx, &a->channels); 1008 } 1009 1010 /* Macros for decoding the iso packet control header. */ 1011 #define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) 1012 #define GET_INTERRUPT(v) (((v) >> 16) & 0x01) 1013 #define GET_SKIP(v) (((v) >> 17) & 0x01) 1014 #define GET_TAG(v) (((v) >> 18) & 0x03) 1015 #define GET_SY(v) (((v) >> 20) & 0x0f) 1016 #define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) 1017 1018 static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 1019 { 1020 struct fw_cdev_queue_iso *a = &arg->queue_iso; 1021 struct fw_cdev_iso_packet __user *p, *end, *next; 1022 struct fw_iso_context *ctx = client->iso_context; 1023 unsigned long payload, buffer_end, transmit_header_bytes = 0; 1024 u32 control; 1025 int count; 1026 struct { 1027 struct fw_iso_packet packet; 1028 u8 header[256]; 1029 } u; 1030 1031 if (ctx == NULL || a->handle != 0) 1032 return -EINVAL; 1033 1034 /* 1035 * If the user passes a non-NULL data pointer, has mmap()'ed 1036 * the iso buffer, and the pointer points inside the buffer, 1037 * we setup the payload pointers accordingly. Otherwise we 1038 * set them both to 0, which will still let packets with 1039 * payload_length == 0 through. In other words, if no packets 1040 * use the indirect payload, the iso buffer need not be mapped 1041 * and the a->data pointer is ignored. 1042 */ 1043 payload = (unsigned long)a->data - client->vm_start; 1044 buffer_end = client->buffer.page_count << PAGE_SHIFT; 1045 if (a->data == 0 || client->buffer.pages == NULL || 1046 payload >= buffer_end) { 1047 payload = 0; 1048 buffer_end = 0; 1049 } 1050 1051 if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3) 1052 return -EINVAL; 1053 1054 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets); 1055 if (!access_ok(VERIFY_READ, p, a->size)) 1056 return -EFAULT; 1057 1058 end = (void __user *)p + a->size; 1059 count = 0; 1060 while (p < end) { 1061 if (get_user(control, &p->control)) 1062 return -EFAULT; 1063 u.packet.payload_length = GET_PAYLOAD_LENGTH(control); 1064 u.packet.interrupt = GET_INTERRUPT(control); 1065 u.packet.skip = GET_SKIP(control); 1066 u.packet.tag = GET_TAG(control); 1067 u.packet.sy = GET_SY(control); 1068 u.packet.header_length = GET_HEADER_LENGTH(control); 1069 1070 switch (ctx->type) { 1071 case FW_ISO_CONTEXT_TRANSMIT: 1072 if (u.packet.header_length & 3) 1073 return -EINVAL; 1074 transmit_header_bytes = u.packet.header_length; 1075 break; 1076 1077 case FW_ISO_CONTEXT_RECEIVE: 1078 if (u.packet.header_length == 0 || 1079 u.packet.header_length % ctx->header_size != 0) 1080 return -EINVAL; 1081 break; 1082 1083 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: 1084 if (u.packet.payload_length == 0 || 1085 u.packet.payload_length & 3) 1086 return -EINVAL; 1087 break; 1088 } 1089 1090 next = (struct fw_cdev_iso_packet __user *) 1091 &p->header[transmit_header_bytes / 4]; 1092 if (next > end) 1093 return -EINVAL; 1094 if (__copy_from_user 1095 (u.packet.header, p->header, transmit_header_bytes)) 1096 return -EFAULT; 1097 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && 1098 u.packet.header_length + u.packet.payload_length > 0) 1099 return -EINVAL; 1100 if (payload + u.packet.payload_length > buffer_end) 1101 return -EINVAL; 1102 1103 if (fw_iso_context_queue(ctx, &u.packet, 1104 &client->buffer, payload)) 1105 break; 1106 1107 p = next; 1108 payload += u.packet.payload_length; 1109 count++; 1110 } 1111 1112 a->size -= uptr_to_u64(p) - a->packets; 1113 a->packets = uptr_to_u64(p); 1114 a->data = client->vm_start + payload; 1115 1116 return count; 1117 } 1118 1119 static int ioctl_start_iso(struct client *client, union ioctl_arg *arg) 1120 { 1121 struct fw_cdev_start_iso *a = &arg->start_iso; 1122 1123 BUILD_BUG_ON( 1124 FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 || 1125 FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 || 1126 FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 || 1127 FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 || 1128 FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS); 1129 1130 if (client->iso_context == NULL || a->handle != 0) 1131 return -EINVAL; 1132 1133 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE && 1134 (a->tags == 0 || a->tags > 15 || a->sync > 15)) 1135 return -EINVAL; 1136 1137 return fw_iso_context_start(client->iso_context, 1138 a->cycle, a->sync, a->tags); 1139 } 1140 1141 static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg) 1142 { 1143 struct fw_cdev_stop_iso *a = &arg->stop_iso; 1144 1145 if (client->iso_context == NULL || a->handle != 0) 1146 return -EINVAL; 1147 1148 return fw_iso_context_stop(client->iso_context); 1149 } 1150 1151 static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg) 1152 { 1153 struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2; 1154 struct fw_card *card = client->device->card; 1155 struct timespec ts = {0, 0}; 1156 u32 cycle_time; 1157 int ret = 0; 1158 1159 local_irq_disable(); 1160 1161 cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME); 1162 1163 switch (a->clk_id) { 1164 case CLOCK_REALTIME: getnstimeofday(&ts); break; 1165 case CLOCK_MONOTONIC: do_posix_clock_monotonic_gettime(&ts); break; 1166 case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts); break; 1167 default: 1168 ret = -EINVAL; 1169 } 1170 1171 local_irq_enable(); 1172 1173 a->tv_sec = ts.tv_sec; 1174 a->tv_nsec = ts.tv_nsec; 1175 a->cycle_timer = cycle_time; 1176 1177 return ret; 1178 } 1179 1180 static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg) 1181 { 1182 struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer; 1183 struct fw_cdev_get_cycle_timer2 ct2; 1184 1185 ct2.clk_id = CLOCK_REALTIME; 1186 ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2); 1187 1188 a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC; 1189 a->cycle_timer = ct2.cycle_timer; 1190 1191 return 0; 1192 } 1193 1194 static void iso_resource_work(struct work_struct *work) 1195 { 1196 struct iso_resource_event *e; 1197 struct iso_resource *r = 1198 container_of(work, struct iso_resource, work.work); 1199 struct client *client = r->client; 1200 int generation, channel, bandwidth, todo; 1201 bool skip, free, success; 1202 1203 spin_lock_irq(&client->lock); 1204 generation = client->device->generation; 1205 todo = r->todo; 1206 /* Allow 1000ms grace period for other reallocations. */ 1207 if (todo == ISO_RES_ALLOC && 1208 time_before64(get_jiffies_64(), 1209 client->device->card->reset_jiffies + HZ)) { 1210 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3)); 1211 skip = true; 1212 } else { 1213 /* We could be called twice within the same generation. */ 1214 skip = todo == ISO_RES_REALLOC && 1215 r->generation == generation; 1216 } 1217 free = todo == ISO_RES_DEALLOC || 1218 todo == ISO_RES_ALLOC_ONCE || 1219 todo == ISO_RES_DEALLOC_ONCE; 1220 r->generation = generation; 1221 spin_unlock_irq(&client->lock); 1222 1223 if (skip) 1224 goto out; 1225 1226 bandwidth = r->bandwidth; 1227 1228 fw_iso_resource_manage(client->device->card, generation, 1229 r->channels, &channel, &bandwidth, 1230 todo == ISO_RES_ALLOC || 1231 todo == ISO_RES_REALLOC || 1232 todo == ISO_RES_ALLOC_ONCE, 1233 r->transaction_data); 1234 /* 1235 * Is this generation outdated already? As long as this resource sticks 1236 * in the idr, it will be scheduled again for a newer generation or at 1237 * shutdown. 1238 */ 1239 if (channel == -EAGAIN && 1240 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC)) 1241 goto out; 1242 1243 success = channel >= 0 || bandwidth > 0; 1244 1245 spin_lock_irq(&client->lock); 1246 /* 1247 * Transit from allocation to reallocation, except if the client 1248 * requested deallocation in the meantime. 1249 */ 1250 if (r->todo == ISO_RES_ALLOC) 1251 r->todo = ISO_RES_REALLOC; 1252 /* 1253 * Allocation or reallocation failure? Pull this resource out of the 1254 * idr and prepare for deletion, unless the client is shutting down. 1255 */ 1256 if (r->todo == ISO_RES_REALLOC && !success && 1257 !client->in_shutdown && 1258 idr_find(&client->resource_idr, r->resource.handle)) { 1259 idr_remove(&client->resource_idr, r->resource.handle); 1260 client_put(client); 1261 free = true; 1262 } 1263 spin_unlock_irq(&client->lock); 1264 1265 if (todo == ISO_RES_ALLOC && channel >= 0) 1266 r->channels = 1ULL << channel; 1267 1268 if (todo == ISO_RES_REALLOC && success) 1269 goto out; 1270 1271 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) { 1272 e = r->e_alloc; 1273 r->e_alloc = NULL; 1274 } else { 1275 e = r->e_dealloc; 1276 r->e_dealloc = NULL; 1277 } 1278 e->iso_resource.handle = r->resource.handle; 1279 e->iso_resource.channel = channel; 1280 e->iso_resource.bandwidth = bandwidth; 1281 1282 queue_event(client, &e->event, 1283 &e->iso_resource, sizeof(e->iso_resource), NULL, 0); 1284 1285 if (free) { 1286 cancel_delayed_work(&r->work); 1287 kfree(r->e_alloc); 1288 kfree(r->e_dealloc); 1289 kfree(r); 1290 } 1291 out: 1292 client_put(client); 1293 } 1294 1295 static void release_iso_resource(struct client *client, 1296 struct client_resource *resource) 1297 { 1298 struct iso_resource *r = 1299 container_of(resource, struct iso_resource, resource); 1300 1301 spin_lock_irq(&client->lock); 1302 r->todo = ISO_RES_DEALLOC; 1303 schedule_iso_resource(r, 0); 1304 spin_unlock_irq(&client->lock); 1305 } 1306 1307 static int init_iso_resource(struct client *client, 1308 struct fw_cdev_allocate_iso_resource *request, int todo) 1309 { 1310 struct iso_resource_event *e1, *e2; 1311 struct iso_resource *r; 1312 int ret; 1313 1314 if ((request->channels == 0 && request->bandwidth == 0) || 1315 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL || 1316 request->bandwidth < 0) 1317 return -EINVAL; 1318 1319 r = kmalloc(sizeof(*r), GFP_KERNEL); 1320 e1 = kmalloc(sizeof(*e1), GFP_KERNEL); 1321 e2 = kmalloc(sizeof(*e2), GFP_KERNEL); 1322 if (r == NULL || e1 == NULL || e2 == NULL) { 1323 ret = -ENOMEM; 1324 goto fail; 1325 } 1326 1327 INIT_DELAYED_WORK(&r->work, iso_resource_work); 1328 r->client = client; 1329 r->todo = todo; 1330 r->generation = -1; 1331 r->channels = request->channels; 1332 r->bandwidth = request->bandwidth; 1333 r->e_alloc = e1; 1334 r->e_dealloc = e2; 1335 1336 e1->iso_resource.closure = request->closure; 1337 e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED; 1338 e2->iso_resource.closure = request->closure; 1339 e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED; 1340 1341 if (todo == ISO_RES_ALLOC) { 1342 r->resource.release = release_iso_resource; 1343 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 1344 if (ret < 0) 1345 goto fail; 1346 } else { 1347 r->resource.release = NULL; 1348 r->resource.handle = -1; 1349 schedule_iso_resource(r, 0); 1350 } 1351 request->handle = r->resource.handle; 1352 1353 return 0; 1354 fail: 1355 kfree(r); 1356 kfree(e1); 1357 kfree(e2); 1358 1359 return ret; 1360 } 1361 1362 static int ioctl_allocate_iso_resource(struct client *client, 1363 union ioctl_arg *arg) 1364 { 1365 return init_iso_resource(client, 1366 &arg->allocate_iso_resource, ISO_RES_ALLOC); 1367 } 1368 1369 static int ioctl_deallocate_iso_resource(struct client *client, 1370 union ioctl_arg *arg) 1371 { 1372 return release_client_resource(client, 1373 arg->deallocate.handle, release_iso_resource, NULL); 1374 } 1375 1376 static int ioctl_allocate_iso_resource_once(struct client *client, 1377 union ioctl_arg *arg) 1378 { 1379 return init_iso_resource(client, 1380 &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE); 1381 } 1382 1383 static int ioctl_deallocate_iso_resource_once(struct client *client, 1384 union ioctl_arg *arg) 1385 { 1386 return init_iso_resource(client, 1387 &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE); 1388 } 1389 1390 /* 1391 * Returns a speed code: Maximum speed to or from this device, 1392 * limited by the device's link speed, the local node's link speed, 1393 * and all PHY port speeds between the two links. 1394 */ 1395 static int ioctl_get_speed(struct client *client, union ioctl_arg *arg) 1396 { 1397 return client->device->max_speed; 1398 } 1399 1400 static int ioctl_send_broadcast_request(struct client *client, 1401 union ioctl_arg *arg) 1402 { 1403 struct fw_cdev_send_request *a = &arg->send_request; 1404 1405 switch (a->tcode) { 1406 case TCODE_WRITE_QUADLET_REQUEST: 1407 case TCODE_WRITE_BLOCK_REQUEST: 1408 break; 1409 default: 1410 return -EINVAL; 1411 } 1412 1413 /* Security policy: Only allow accesses to Units Space. */ 1414 if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END) 1415 return -EACCES; 1416 1417 return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100); 1418 } 1419 1420 static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg) 1421 { 1422 struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet; 1423 struct fw_cdev_send_request request; 1424 int dest; 1425 1426 if (a->speed > client->device->card->link_speed || 1427 a->length > 1024 << a->speed) 1428 return -EIO; 1429 1430 if (a->tag > 3 || a->channel > 63 || a->sy > 15) 1431 return -EINVAL; 1432 1433 dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy); 1434 request.tcode = TCODE_STREAM_DATA; 1435 request.length = a->length; 1436 request.closure = a->closure; 1437 request.data = a->data; 1438 request.generation = a->generation; 1439 1440 return init_request(client, &request, dest, a->speed); 1441 } 1442 1443 static void outbound_phy_packet_callback(struct fw_packet *packet, 1444 struct fw_card *card, int status) 1445 { 1446 struct outbound_phy_packet_event *e = 1447 container_of(packet, struct outbound_phy_packet_event, p); 1448 1449 switch (status) { 1450 /* expected: */ 1451 case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break; 1452 /* should never happen with PHY packets: */ 1453 case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break; 1454 case ACK_BUSY_X: 1455 case ACK_BUSY_A: 1456 case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break; 1457 case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break; 1458 case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break; 1459 /* stale generation; cancelled; on certain controllers: no ack */ 1460 default: e->phy_packet.rcode = status; break; 1461 } 1462 e->phy_packet.data[0] = packet->timestamp; 1463 1464 queue_event(e->client, &e->event, &e->phy_packet, 1465 sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); 1466 client_put(e->client); 1467 } 1468 1469 static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) 1470 { 1471 struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet; 1472 struct fw_card *card = client->device->card; 1473 struct outbound_phy_packet_event *e; 1474 1475 /* Access policy: Allow this ioctl only on local nodes' device files. */ 1476 if (!client->device->is_local) 1477 return -ENOSYS; 1478 1479 e = kzalloc(sizeof(*e) + 4, GFP_KERNEL); 1480 if (e == NULL) 1481 return -ENOMEM; 1482 1483 client_get(client); 1484 e->client = client; 1485 e->p.speed = SCODE_100; 1486 e->p.generation = a->generation; 1487 e->p.header[0] = TCODE_LINK_INTERNAL << 4; 1488 e->p.header[1] = a->data[0]; 1489 e->p.header[2] = a->data[1]; 1490 e->p.header_length = 12; 1491 e->p.callback = outbound_phy_packet_callback; 1492 e->phy_packet.closure = a->closure; 1493 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT; 1494 if (is_ping_packet(a->data)) 1495 e->phy_packet.length = 4; 1496 1497 card->driver->send_request(card, &e->p); 1498 1499 return 0; 1500 } 1501 1502 static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg) 1503 { 1504 struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets; 1505 struct fw_card *card = client->device->card; 1506 1507 /* Access policy: Allow this ioctl only on local nodes' device files. */ 1508 if (!client->device->is_local) 1509 return -ENOSYS; 1510 1511 spin_lock_irq(&card->lock); 1512 1513 list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list); 1514 client->phy_receiver_closure = a->closure; 1515 1516 spin_unlock_irq(&card->lock); 1517 1518 return 0; 1519 } 1520 1521 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p) 1522 { 1523 struct client *client; 1524 struct inbound_phy_packet_event *e; 1525 unsigned long flags; 1526 1527 spin_lock_irqsave(&card->lock, flags); 1528 1529 list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) { 1530 e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC); 1531 if (e == NULL) { 1532 fw_notify("Out of memory when allocating event\n"); 1533 break; 1534 } 1535 e->phy_packet.closure = client->phy_receiver_closure; 1536 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED; 1537 e->phy_packet.rcode = RCODE_COMPLETE; 1538 e->phy_packet.length = 8; 1539 e->phy_packet.data[0] = p->header[1]; 1540 e->phy_packet.data[1] = p->header[2]; 1541 queue_event(client, &e->event, 1542 &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0); 1543 } 1544 1545 spin_unlock_irqrestore(&card->lock, flags); 1546 } 1547 1548 static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = { 1549 [0x00] = ioctl_get_info, 1550 [0x01] = ioctl_send_request, 1551 [0x02] = ioctl_allocate, 1552 [0x03] = ioctl_deallocate, 1553 [0x04] = ioctl_send_response, 1554 [0x05] = ioctl_initiate_bus_reset, 1555 [0x06] = ioctl_add_descriptor, 1556 [0x07] = ioctl_remove_descriptor, 1557 [0x08] = ioctl_create_iso_context, 1558 [0x09] = ioctl_queue_iso, 1559 [0x0a] = ioctl_start_iso, 1560 [0x0b] = ioctl_stop_iso, 1561 [0x0c] = ioctl_get_cycle_timer, 1562 [0x0d] = ioctl_allocate_iso_resource, 1563 [0x0e] = ioctl_deallocate_iso_resource, 1564 [0x0f] = ioctl_allocate_iso_resource_once, 1565 [0x10] = ioctl_deallocate_iso_resource_once, 1566 [0x11] = ioctl_get_speed, 1567 [0x12] = ioctl_send_broadcast_request, 1568 [0x13] = ioctl_send_stream_packet, 1569 [0x14] = ioctl_get_cycle_timer2, 1570 [0x15] = ioctl_send_phy_packet, 1571 [0x16] = ioctl_receive_phy_packets, 1572 [0x17] = ioctl_set_iso_channels, 1573 }; 1574 1575 static int dispatch_ioctl(struct client *client, 1576 unsigned int cmd, void __user *arg) 1577 { 1578 union ioctl_arg buffer; 1579 int ret; 1580 1581 if (fw_device_is_shutdown(client->device)) 1582 return -ENODEV; 1583 1584 if (_IOC_TYPE(cmd) != '#' || 1585 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) || 1586 _IOC_SIZE(cmd) > sizeof(buffer)) 1587 return -EINVAL; 1588 1589 if (_IOC_DIR(cmd) == _IOC_READ) 1590 memset(&buffer, 0, _IOC_SIZE(cmd)); 1591 1592 if (_IOC_DIR(cmd) & _IOC_WRITE) 1593 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd))) 1594 return -EFAULT; 1595 1596 ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer); 1597 if (ret < 0) 1598 return ret; 1599 1600 if (_IOC_DIR(cmd) & _IOC_READ) 1601 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd))) 1602 return -EFAULT; 1603 1604 return ret; 1605 } 1606 1607 static long fw_device_op_ioctl(struct file *file, 1608 unsigned int cmd, unsigned long arg) 1609 { 1610 return dispatch_ioctl(file->private_data, cmd, (void __user *)arg); 1611 } 1612 1613 #ifdef CONFIG_COMPAT 1614 static long fw_device_op_compat_ioctl(struct file *file, 1615 unsigned int cmd, unsigned long arg) 1616 { 1617 return dispatch_ioctl(file->private_data, cmd, compat_ptr(arg)); 1618 } 1619 #endif 1620 1621 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) 1622 { 1623 struct client *client = file->private_data; 1624 enum dma_data_direction direction; 1625 unsigned long size; 1626 int page_count, ret; 1627 1628 if (fw_device_is_shutdown(client->device)) 1629 return -ENODEV; 1630 1631 /* FIXME: We could support multiple buffers, but we don't. */ 1632 if (client->buffer.pages != NULL) 1633 return -EBUSY; 1634 1635 if (!(vma->vm_flags & VM_SHARED)) 1636 return -EINVAL; 1637 1638 if (vma->vm_start & ~PAGE_MASK) 1639 return -EINVAL; 1640 1641 client->vm_start = vma->vm_start; 1642 size = vma->vm_end - vma->vm_start; 1643 page_count = size >> PAGE_SHIFT; 1644 if (size & ~PAGE_MASK) 1645 return -EINVAL; 1646 1647 if (vma->vm_flags & VM_WRITE) 1648 direction = DMA_TO_DEVICE; 1649 else 1650 direction = DMA_FROM_DEVICE; 1651 1652 ret = fw_iso_buffer_init(&client->buffer, client->device->card, 1653 page_count, direction); 1654 if (ret < 0) 1655 return ret; 1656 1657 ret = fw_iso_buffer_map(&client->buffer, vma); 1658 if (ret < 0) 1659 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1660 1661 return ret; 1662 } 1663 1664 static int is_outbound_transaction_resource(int id, void *p, void *data) 1665 { 1666 struct client_resource *resource = p; 1667 1668 return resource->release == release_transaction; 1669 } 1670 1671 static int has_outbound_transactions(struct client *client) 1672 { 1673 int ret; 1674 1675 spin_lock_irq(&client->lock); 1676 ret = idr_for_each(&client->resource_idr, 1677 is_outbound_transaction_resource, NULL); 1678 spin_unlock_irq(&client->lock); 1679 1680 return ret; 1681 } 1682 1683 static int shutdown_resource(int id, void *p, void *data) 1684 { 1685 struct client_resource *resource = p; 1686 struct client *client = data; 1687 1688 resource->release(client, resource); 1689 client_put(client); 1690 1691 return 0; 1692 } 1693 1694 static int fw_device_op_release(struct inode *inode, struct file *file) 1695 { 1696 struct client *client = file->private_data; 1697 struct event *event, *next_event; 1698 1699 spin_lock_irq(&client->device->card->lock); 1700 list_del(&client->phy_receiver_link); 1701 spin_unlock_irq(&client->device->card->lock); 1702 1703 mutex_lock(&client->device->client_list_mutex); 1704 list_del(&client->link); 1705 mutex_unlock(&client->device->client_list_mutex); 1706 1707 if (client->iso_context) 1708 fw_iso_context_destroy(client->iso_context); 1709 1710 if (client->buffer.pages) 1711 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1712 1713 /* Freeze client->resource_idr and client->event_list */ 1714 spin_lock_irq(&client->lock); 1715 client->in_shutdown = true; 1716 spin_unlock_irq(&client->lock); 1717 1718 wait_event(client->tx_flush_wait, !has_outbound_transactions(client)); 1719 1720 idr_for_each(&client->resource_idr, shutdown_resource, client); 1721 idr_remove_all(&client->resource_idr); 1722 idr_destroy(&client->resource_idr); 1723 1724 list_for_each_entry_safe(event, next_event, &client->event_list, link) 1725 kfree(event); 1726 1727 client_put(client); 1728 1729 return 0; 1730 } 1731 1732 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt) 1733 { 1734 struct client *client = file->private_data; 1735 unsigned int mask = 0; 1736 1737 poll_wait(file, &client->wait, pt); 1738 1739 if (fw_device_is_shutdown(client->device)) 1740 mask |= POLLHUP | POLLERR; 1741 if (!list_empty(&client->event_list)) 1742 mask |= POLLIN | POLLRDNORM; 1743 1744 return mask; 1745 } 1746 1747 const struct file_operations fw_device_ops = { 1748 .owner = THIS_MODULE, 1749 .llseek = no_llseek, 1750 .open = fw_device_op_open, 1751 .read = fw_device_op_read, 1752 .unlocked_ioctl = fw_device_op_ioctl, 1753 .mmap = fw_device_op_mmap, 1754 .release = fw_device_op_release, 1755 .poll = fw_device_op_poll, 1756 #ifdef CONFIG_COMPAT 1757 .compat_ioctl = fw_device_op_compat_ioctl, 1758 #endif 1759 }; 1760