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