core-cdev.c revision ae2a97661482c1d0f1aa41b837da95054d0e9a1b
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/spinlock.h> 39#include <linux/string.h> 40#include <linux/time.h> 41#include <linux/uaccess.h> 42#include <linux/vmalloc.h> 43#include <linux/wait.h> 44#include <linux/workqueue.h> 45 46#include <asm/system.h> 47 48#include "core.h" 49 50/* 51 * ABI version history is documented in linux/firewire-cdev.h. 52 */ 53#define FW_CDEV_KERNEL_VERSION 4 54#define FW_CDEV_VERSION_EVENT_REQUEST2 4 55#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 56 57struct client { 58 u32 version; 59 struct fw_device *device; 60 61 spinlock_t lock; 62 bool in_shutdown; 63 struct idr resource_idr; 64 struct list_head event_list; 65 wait_queue_head_t wait; 66 u64 bus_reset_closure; 67 68 struct fw_iso_context *iso_context; 69 u64 iso_closure; 70 struct fw_iso_buffer buffer; 71 unsigned long vm_start; 72 73 struct list_head phy_receiver_link; 74 u64 phy_receiver_closure; 75 76 struct list_head link; 77 struct kref kref; 78}; 79 80static inline void client_get(struct client *client) 81{ 82 kref_get(&client->kref); 83} 84 85static void client_release(struct kref *kref) 86{ 87 struct client *client = container_of(kref, struct client, kref); 88 89 fw_device_put(client->device); 90 kfree(client); 91} 92 93static void client_put(struct client *client) 94{ 95 kref_put(&client->kref, client_release); 96} 97 98struct client_resource; 99typedef void (*client_resource_release_fn_t)(struct client *, 100 struct client_resource *); 101struct client_resource { 102 client_resource_release_fn_t release; 103 int handle; 104}; 105 106struct address_handler_resource { 107 struct client_resource resource; 108 struct fw_address_handler handler; 109 __u64 closure; 110 struct client *client; 111}; 112 113struct outbound_transaction_resource { 114 struct client_resource resource; 115 struct fw_transaction transaction; 116}; 117 118struct inbound_transaction_resource { 119 struct client_resource resource; 120 struct fw_card *card; 121 struct fw_request *request; 122 void *data; 123 size_t length; 124}; 125 126struct descriptor_resource { 127 struct client_resource resource; 128 struct fw_descriptor descriptor; 129 u32 data[0]; 130}; 131 132struct iso_resource { 133 struct client_resource resource; 134 struct client *client; 135 /* Schedule work and access todo only with client->lock held. */ 136 struct delayed_work work; 137 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC, 138 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo; 139 int generation; 140 u64 channels; 141 s32 bandwidth; 142 __be32 transaction_data[2]; 143 struct iso_resource_event *e_alloc, *e_dealloc; 144}; 145 146static void release_iso_resource(struct client *, struct client_resource *); 147 148static void schedule_iso_resource(struct iso_resource *r, unsigned long delay) 149{ 150 client_get(r->client); 151 if (!schedule_delayed_work(&r->work, delay)) 152 client_put(r->client); 153} 154 155static void schedule_if_iso_resource(struct client_resource *resource) 156{ 157 if (resource->release == release_iso_resource) 158 schedule_iso_resource(container_of(resource, 159 struct iso_resource, resource), 0); 160} 161 162/* 163 * dequeue_event() just kfree()'s the event, so the event has to be 164 * the first field in a struct XYZ_event. 165 */ 166struct event { 167 struct { void *data; size_t size; } v[2]; 168 struct list_head link; 169}; 170 171struct bus_reset_event { 172 struct event event; 173 struct fw_cdev_event_bus_reset reset; 174}; 175 176struct outbound_transaction_event { 177 struct event event; 178 struct client *client; 179 struct outbound_transaction_resource r; 180 struct fw_cdev_event_response response; 181}; 182 183struct inbound_transaction_event { 184 struct event event; 185 union { 186 struct fw_cdev_event_request request; 187 struct fw_cdev_event_request2 request2; 188 } req; 189}; 190 191struct iso_interrupt_event { 192 struct event event; 193 struct fw_cdev_event_iso_interrupt interrupt; 194}; 195 196struct iso_resource_event { 197 struct event event; 198 struct fw_cdev_event_iso_resource iso_resource; 199}; 200 201struct outbound_phy_packet_event { 202 struct event event; 203 struct client *client; 204 struct fw_packet p; 205 struct fw_cdev_event_phy_packet phy_packet; 206}; 207 208struct inbound_phy_packet_event { 209 struct event event; 210 struct fw_cdev_event_phy_packet phy_packet; 211}; 212 213static inline void __user *u64_to_uptr(__u64 value) 214{ 215 return (void __user *)(unsigned long)value; 216} 217 218static inline __u64 uptr_to_u64(void __user *ptr) 219{ 220 return (__u64)(unsigned long)ptr; 221} 222 223static int fw_device_op_open(struct inode *inode, struct file *file) 224{ 225 struct fw_device *device; 226 struct client *client; 227 228 device = fw_device_get_by_devt(inode->i_rdev); 229 if (device == NULL) 230 return -ENODEV; 231 232 if (fw_device_is_shutdown(device)) { 233 fw_device_put(device); 234 return -ENODEV; 235 } 236 237 client = kzalloc(sizeof(*client), GFP_KERNEL); 238 if (client == NULL) { 239 fw_device_put(device); 240 return -ENOMEM; 241 } 242 243 client->device = device; 244 spin_lock_init(&client->lock); 245 idr_init(&client->resource_idr); 246 INIT_LIST_HEAD(&client->event_list); 247 init_waitqueue_head(&client->wait); 248 INIT_LIST_HEAD(&client->phy_receiver_link); 249 kref_init(&client->kref); 250 251 file->private_data = client; 252 253 mutex_lock(&device->client_list_mutex); 254 list_add_tail(&client->link, &device->client_list); 255 mutex_unlock(&device->client_list_mutex); 256 257 return nonseekable_open(inode, file); 258} 259 260static void queue_event(struct client *client, struct event *event, 261 void *data0, size_t size0, void *data1, size_t size1) 262{ 263 unsigned long flags; 264 265 event->v[0].data = data0; 266 event->v[0].size = size0; 267 event->v[1].data = data1; 268 event->v[1].size = size1; 269 270 spin_lock_irqsave(&client->lock, flags); 271 if (client->in_shutdown) 272 kfree(event); 273 else 274 list_add_tail(&event->link, &client->event_list); 275 spin_unlock_irqrestore(&client->lock, flags); 276 277 wake_up_interruptible(&client->wait); 278} 279 280static int dequeue_event(struct client *client, 281 char __user *buffer, size_t count) 282{ 283 struct event *event; 284 size_t size, total; 285 int i, ret; 286 287 ret = wait_event_interruptible(client->wait, 288 !list_empty(&client->event_list) || 289 fw_device_is_shutdown(client->device)); 290 if (ret < 0) 291 return ret; 292 293 if (list_empty(&client->event_list) && 294 fw_device_is_shutdown(client->device)) 295 return -ENODEV; 296 297 spin_lock_irq(&client->lock); 298 event = list_first_entry(&client->event_list, struct event, link); 299 list_del(&event->link); 300 spin_unlock_irq(&client->lock); 301 302 total = 0; 303 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { 304 size = min(event->v[i].size, count - total); 305 if (copy_to_user(buffer + total, event->v[i].data, size)) { 306 ret = -EFAULT; 307 goto out; 308 } 309 total += size; 310 } 311 ret = total; 312 313 out: 314 kfree(event); 315 316 return ret; 317} 318 319static ssize_t fw_device_op_read(struct file *file, char __user *buffer, 320 size_t count, loff_t *offset) 321{ 322 struct client *client = file->private_data; 323 324 return dequeue_event(client, buffer, count); 325} 326 327static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, 328 struct client *client) 329{ 330 struct fw_card *card = client->device->card; 331 332 spin_lock_irq(&card->lock); 333 334 event->closure = client->bus_reset_closure; 335 event->type = FW_CDEV_EVENT_BUS_RESET; 336 event->generation = client->device->generation; 337 event->node_id = client->device->node_id; 338 event->local_node_id = card->local_node->node_id; 339 event->bm_node_id = card->bm_node_id; 340 event->irm_node_id = card->irm_node->node_id; 341 event->root_node_id = card->root_node->node_id; 342 343 spin_unlock_irq(&card->lock); 344} 345 346static void for_each_client(struct fw_device *device, 347 void (*callback)(struct client *client)) 348{ 349 struct client *c; 350 351 mutex_lock(&device->client_list_mutex); 352 list_for_each_entry(c, &device->client_list, link) 353 callback(c); 354 mutex_unlock(&device->client_list_mutex); 355} 356 357static int schedule_reallocations(int id, void *p, void *data) 358{ 359 schedule_if_iso_resource(p); 360 361 return 0; 362} 363 364static void queue_bus_reset_event(struct client *client) 365{ 366 struct bus_reset_event *e; 367 368 e = kzalloc(sizeof(*e), GFP_KERNEL); 369 if (e == NULL) { 370 fw_notify("Out of memory when allocating event\n"); 371 return; 372 } 373 374 fill_bus_reset_event(&e->reset, client); 375 376 queue_event(client, &e->event, 377 &e->reset, sizeof(e->reset), NULL, 0); 378 379 spin_lock_irq(&client->lock); 380 idr_for_each(&client->resource_idr, schedule_reallocations, client); 381 spin_unlock_irq(&client->lock); 382} 383 384void fw_device_cdev_update(struct fw_device *device) 385{ 386 for_each_client(device, queue_bus_reset_event); 387} 388 389static void wake_up_client(struct client *client) 390{ 391 wake_up_interruptible(&client->wait); 392} 393 394void fw_device_cdev_remove(struct fw_device *device) 395{ 396 for_each_client(device, wake_up_client); 397} 398 399union ioctl_arg { 400 struct fw_cdev_get_info get_info; 401 struct fw_cdev_send_request send_request; 402 struct fw_cdev_allocate allocate; 403 struct fw_cdev_deallocate deallocate; 404 struct fw_cdev_send_response send_response; 405 struct fw_cdev_initiate_bus_reset initiate_bus_reset; 406 struct fw_cdev_add_descriptor add_descriptor; 407 struct fw_cdev_remove_descriptor remove_descriptor; 408 struct fw_cdev_create_iso_context create_iso_context; 409 struct fw_cdev_queue_iso queue_iso; 410 struct fw_cdev_start_iso start_iso; 411 struct fw_cdev_stop_iso stop_iso; 412 struct fw_cdev_get_cycle_timer get_cycle_timer; 413 struct fw_cdev_allocate_iso_resource allocate_iso_resource; 414 struct fw_cdev_send_stream_packet send_stream_packet; 415 struct fw_cdev_get_cycle_timer2 get_cycle_timer2; 416 struct fw_cdev_send_phy_packet send_phy_packet; 417 struct fw_cdev_receive_phy_packets receive_phy_packets; 418}; 419 420static int ioctl_get_info(struct client *client, union ioctl_arg *arg) 421{ 422 struct fw_cdev_get_info *a = &arg->get_info; 423 struct fw_cdev_event_bus_reset bus_reset; 424 unsigned long ret = 0; 425 426 client->version = a->version; 427 a->version = FW_CDEV_KERNEL_VERSION; 428 a->card = client->device->card->index; 429 430 down_read(&fw_device_rwsem); 431 432 if (a->rom != 0) { 433 size_t want = a->rom_length; 434 size_t have = client->device->config_rom_length * 4; 435 436 ret = copy_to_user(u64_to_uptr(a->rom), 437 client->device->config_rom, min(want, have)); 438 } 439 a->rom_length = client->device->config_rom_length * 4; 440 441 up_read(&fw_device_rwsem); 442 443 if (ret != 0) 444 return -EFAULT; 445 446 client->bus_reset_closure = a->bus_reset_closure; 447 if (a->bus_reset != 0) { 448 fill_bus_reset_event(&bus_reset, client); 449 if (copy_to_user(u64_to_uptr(a->bus_reset), 450 &bus_reset, sizeof(bus_reset))) 451 return -EFAULT; 452 } 453 454 return 0; 455} 456 457static int add_client_resource(struct client *client, 458 struct client_resource *resource, gfp_t gfp_mask) 459{ 460 unsigned long flags; 461 int ret; 462 463 retry: 464 if (idr_pre_get(&client->resource_idr, gfp_mask) == 0) 465 return -ENOMEM; 466 467 spin_lock_irqsave(&client->lock, flags); 468 if (client->in_shutdown) 469 ret = -ECANCELED; 470 else 471 ret = idr_get_new(&client->resource_idr, resource, 472 &resource->handle); 473 if (ret >= 0) { 474 client_get(client); 475 schedule_if_iso_resource(resource); 476 } 477 spin_unlock_irqrestore(&client->lock, flags); 478 479 if (ret == -EAGAIN) 480 goto retry; 481 482 return ret < 0 ? ret : 0; 483} 484 485static int release_client_resource(struct client *client, u32 handle, 486 client_resource_release_fn_t release, 487 struct client_resource **return_resource) 488{ 489 struct client_resource *resource; 490 491 spin_lock_irq(&client->lock); 492 if (client->in_shutdown) 493 resource = NULL; 494 else 495 resource = idr_find(&client->resource_idr, handle); 496 if (resource && resource->release == release) 497 idr_remove(&client->resource_idr, handle); 498 spin_unlock_irq(&client->lock); 499 500 if (!(resource && resource->release == release)) 501 return -EINVAL; 502 503 if (return_resource) 504 *return_resource = resource; 505 else 506 resource->release(client, resource); 507 508 client_put(client); 509 510 return 0; 511} 512 513static void release_transaction(struct client *client, 514 struct client_resource *resource) 515{ 516 struct outbound_transaction_resource *r = container_of(resource, 517 struct outbound_transaction_resource, resource); 518 519 fw_cancel_transaction(client->device->card, &r->transaction); 520} 521 522static void complete_transaction(struct fw_card *card, int rcode, 523 void *payload, size_t length, void *data) 524{ 525 struct outbound_transaction_event *e = data; 526 struct fw_cdev_event_response *rsp = &e->response; 527 struct client *client = e->client; 528 unsigned long flags; 529 530 if (length < rsp->length) 531 rsp->length = length; 532 if (rcode == RCODE_COMPLETE) 533 memcpy(rsp->data, payload, rsp->length); 534 535 spin_lock_irqsave(&client->lock, flags); 536 /* 537 * 1. If called while in shutdown, the idr tree must be left untouched. 538 * The idr handle will be removed and the client reference will be 539 * dropped later. 540 * 2. If the call chain was release_client_resource -> 541 * release_transaction -> complete_transaction (instead of a normal 542 * conclusion of the transaction), i.e. if this resource was already 543 * unregistered from the idr, the client reference will be dropped 544 * by release_client_resource and we must not drop it here. 545 */ 546 if (!client->in_shutdown && 547 idr_find(&client->resource_idr, e->r.resource.handle)) { 548 idr_remove(&client->resource_idr, e->r.resource.handle); 549 /* Drop the idr's reference */ 550 client_put(client); 551 } 552 spin_unlock_irqrestore(&client->lock, flags); 553 554 rsp->type = FW_CDEV_EVENT_RESPONSE; 555 rsp->rcode = rcode; 556 557 /* 558 * In the case that sizeof(*rsp) doesn't align with the position of the 559 * data, and the read is short, preserve an extra copy of the data 560 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless 561 * for short reads and some apps depended on it, this is both safe 562 * and prudent for compatibility. 563 */ 564 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data)) 565 queue_event(client, &e->event, rsp, sizeof(*rsp), 566 rsp->data, rsp->length); 567 else 568 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, 569 NULL, 0); 570 571 /* Drop the transaction callback's reference */ 572 client_put(client); 573} 574 575static int init_request(struct client *client, 576 struct fw_cdev_send_request *request, 577 int destination_id, int speed) 578{ 579 struct outbound_transaction_event *e; 580 int ret; 581 582 if (request->tcode != TCODE_STREAM_DATA && 583 (request->length > 4096 || request->length > 512 << speed)) 584 return -EIO; 585 586 if (request->tcode == TCODE_WRITE_QUADLET_REQUEST && 587 request->length < 4) 588 return -EINVAL; 589 590 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL); 591 if (e == NULL) 592 return -ENOMEM; 593 594 e->client = client; 595 e->response.length = request->length; 596 e->response.closure = request->closure; 597 598 if (request->data && 599 copy_from_user(e->response.data, 600 u64_to_uptr(request->data), request->length)) { 601 ret = -EFAULT; 602 goto failed; 603 } 604 605 e->r.resource.release = release_transaction; 606 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL); 607 if (ret < 0) 608 goto failed; 609 610 /* Get a reference for the transaction callback */ 611 client_get(client); 612 613 fw_send_request(client->device->card, &e->r.transaction, 614 request->tcode, destination_id, request->generation, 615 speed, request->offset, e->response.data, 616 request->length, complete_transaction, e); 617 return 0; 618 619 failed: 620 kfree(e); 621 622 return ret; 623} 624 625static int ioctl_send_request(struct client *client, union ioctl_arg *arg) 626{ 627 switch (arg->send_request.tcode) { 628 case TCODE_WRITE_QUADLET_REQUEST: 629 case TCODE_WRITE_BLOCK_REQUEST: 630 case TCODE_READ_QUADLET_REQUEST: 631 case TCODE_READ_BLOCK_REQUEST: 632 case TCODE_LOCK_MASK_SWAP: 633 case TCODE_LOCK_COMPARE_SWAP: 634 case TCODE_LOCK_FETCH_ADD: 635 case TCODE_LOCK_LITTLE_ADD: 636 case TCODE_LOCK_BOUNDED_ADD: 637 case TCODE_LOCK_WRAP_ADD: 638 case TCODE_LOCK_VENDOR_DEPENDENT: 639 break; 640 default: 641 return -EINVAL; 642 } 643 644 return init_request(client, &arg->send_request, client->device->node_id, 645 client->device->max_speed); 646} 647 648static inline bool is_fcp_request(struct fw_request *request) 649{ 650 return request == NULL; 651} 652 653static void release_request(struct client *client, 654 struct client_resource *resource) 655{ 656 struct inbound_transaction_resource *r = container_of(resource, 657 struct inbound_transaction_resource, resource); 658 659 if (is_fcp_request(r->request)) 660 kfree(r->data); 661 else 662 fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR); 663 664 fw_card_put(r->card); 665 kfree(r); 666} 667 668static void handle_request(struct fw_card *card, struct fw_request *request, 669 int tcode, int destination, int source, 670 int generation, unsigned long long offset, 671 void *payload, size_t length, void *callback_data) 672{ 673 struct address_handler_resource *handler = callback_data; 674 struct inbound_transaction_resource *r; 675 struct inbound_transaction_event *e; 676 size_t event_size0; 677 void *fcp_frame = NULL; 678 int ret; 679 680 /* card may be different from handler->client->device->card */ 681 fw_card_get(card); 682 683 r = kmalloc(sizeof(*r), GFP_ATOMIC); 684 e = kmalloc(sizeof(*e), GFP_ATOMIC); 685 if (r == NULL || e == NULL) { 686 fw_notify("Out of memory when allocating event\n"); 687 goto failed; 688 } 689 r->card = card; 690 r->request = request; 691 r->data = payload; 692 r->length = length; 693 694 if (is_fcp_request(request)) { 695 /* 696 * FIXME: Let core-transaction.c manage a 697 * single reference-counted copy? 698 */ 699 fcp_frame = kmemdup(payload, length, GFP_ATOMIC); 700 if (fcp_frame == NULL) 701 goto failed; 702 703 r->data = fcp_frame; 704 } 705 706 r->resource.release = release_request; 707 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC); 708 if (ret < 0) 709 goto failed; 710 711 if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) { 712 struct fw_cdev_event_request *req = &e->req.request; 713 714 if (tcode & 0x10) 715 tcode = TCODE_LOCK_REQUEST; 716 717 req->type = FW_CDEV_EVENT_REQUEST; 718 req->tcode = tcode; 719 req->offset = offset; 720 req->length = length; 721 req->handle = r->resource.handle; 722 req->closure = handler->closure; 723 event_size0 = sizeof(*req); 724 } else { 725 struct fw_cdev_event_request2 *req = &e->req.request2; 726 727 req->type = FW_CDEV_EVENT_REQUEST2; 728 req->tcode = tcode; 729 req->offset = offset; 730 req->source_node_id = source; 731 req->destination_node_id = destination; 732 req->card = card->index; 733 req->generation = generation; 734 req->length = length; 735 req->handle = r->resource.handle; 736 req->closure = handler->closure; 737 event_size0 = sizeof(*req); 738 } 739 740 queue_event(handler->client, &e->event, 741 &e->req, event_size0, r->data, length); 742 return; 743 744 failed: 745 kfree(r); 746 kfree(e); 747 kfree(fcp_frame); 748 749 if (!is_fcp_request(request)) 750 fw_send_response(card, request, RCODE_CONFLICT_ERROR); 751 752 fw_card_put(card); 753} 754 755static void release_address_handler(struct client *client, 756 struct client_resource *resource) 757{ 758 struct address_handler_resource *r = 759 container_of(resource, struct address_handler_resource, resource); 760 761 fw_core_remove_address_handler(&r->handler); 762 kfree(r); 763} 764 765static int ioctl_allocate(struct client *client, union ioctl_arg *arg) 766{ 767 struct fw_cdev_allocate *a = &arg->allocate; 768 struct address_handler_resource *r; 769 struct fw_address_region region; 770 int ret; 771 772 r = kmalloc(sizeof(*r), GFP_KERNEL); 773 if (r == NULL) 774 return -ENOMEM; 775 776 region.start = a->offset; 777 if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END) 778 region.end = a->offset + a->length; 779 else 780 region.end = a->region_end; 781 782 r->handler.length = a->length; 783 r->handler.address_callback = handle_request; 784 r->handler.callback_data = r; 785 r->closure = a->closure; 786 r->client = client; 787 788 ret = fw_core_add_address_handler(&r->handler, ®ion); 789 if (ret < 0) { 790 kfree(r); 791 return ret; 792 } 793 a->offset = r->handler.offset; 794 795 r->resource.release = release_address_handler; 796 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 797 if (ret < 0) { 798 release_address_handler(client, &r->resource); 799 return ret; 800 } 801 a->handle = r->resource.handle; 802 803 return 0; 804} 805 806static int ioctl_deallocate(struct client *client, union ioctl_arg *arg) 807{ 808 return release_client_resource(client, arg->deallocate.handle, 809 release_address_handler, NULL); 810} 811 812static int ioctl_send_response(struct client *client, union ioctl_arg *arg) 813{ 814 struct fw_cdev_send_response *a = &arg->send_response; 815 struct client_resource *resource; 816 struct inbound_transaction_resource *r; 817 int ret = 0; 818 819 if (release_client_resource(client, a->handle, 820 release_request, &resource) < 0) 821 return -EINVAL; 822 823 r = container_of(resource, struct inbound_transaction_resource, 824 resource); 825 if (is_fcp_request(r->request)) 826 goto out; 827 828 if (a->length != fw_get_response_length(r->request)) { 829 ret = -EINVAL; 830 kfree(r->request); 831 goto out; 832 } 833 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) { 834 ret = -EFAULT; 835 kfree(r->request); 836 goto out; 837 } 838 fw_send_response(r->card, r->request, a->rcode); 839 out: 840 fw_card_put(r->card); 841 kfree(r); 842 843 return ret; 844} 845 846static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg) 847{ 848 fw_schedule_bus_reset(client->device->card, true, 849 arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET); 850 return 0; 851} 852 853static void release_descriptor(struct client *client, 854 struct client_resource *resource) 855{ 856 struct descriptor_resource *r = 857 container_of(resource, struct descriptor_resource, resource); 858 859 fw_core_remove_descriptor(&r->descriptor); 860 kfree(r); 861} 862 863static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg) 864{ 865 struct fw_cdev_add_descriptor *a = &arg->add_descriptor; 866 struct descriptor_resource *r; 867 int ret; 868 869 /* Access policy: Allow this ioctl only on local nodes' device files. */ 870 if (!client->device->is_local) 871 return -ENOSYS; 872 873 if (a->length > 256) 874 return -EINVAL; 875 876 r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL); 877 if (r == NULL) 878 return -ENOMEM; 879 880 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) { 881 ret = -EFAULT; 882 goto failed; 883 } 884 885 r->descriptor.length = a->length; 886 r->descriptor.immediate = a->immediate; 887 r->descriptor.key = a->key; 888 r->descriptor.data = r->data; 889 890 ret = fw_core_add_descriptor(&r->descriptor); 891 if (ret < 0) 892 goto failed; 893 894 r->resource.release = release_descriptor; 895 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 896 if (ret < 0) { 897 fw_core_remove_descriptor(&r->descriptor); 898 goto failed; 899 } 900 a->handle = r->resource.handle; 901 902 return 0; 903 failed: 904 kfree(r); 905 906 return ret; 907} 908 909static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg) 910{ 911 return release_client_resource(client, arg->remove_descriptor.handle, 912 release_descriptor, NULL); 913} 914 915static void iso_callback(struct fw_iso_context *context, u32 cycle, 916 size_t header_length, void *header, void *data) 917{ 918 struct client *client = data; 919 struct iso_interrupt_event *e; 920 921 e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC); 922 if (e == NULL) { 923 fw_notify("Out of memory when allocating event\n"); 924 return; 925 } 926 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; 927 e->interrupt.closure = client->iso_closure; 928 e->interrupt.cycle = cycle; 929 e->interrupt.header_length = header_length; 930 memcpy(e->interrupt.header, header, header_length); 931 queue_event(client, &e->event, &e->interrupt, 932 sizeof(e->interrupt) + header_length, NULL, 0); 933} 934 935static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) 936{ 937 struct fw_cdev_create_iso_context *a = &arg->create_iso_context; 938 struct fw_iso_context *context; 939 940 BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT || 941 FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE); 942 943 if (a->channel > 63) 944 return -EINVAL; 945 946 switch (a->type) { 947 case FW_ISO_CONTEXT_RECEIVE: 948 if (a->header_size < 4 || (a->header_size & 3)) 949 return -EINVAL; 950 break; 951 952 case FW_ISO_CONTEXT_TRANSMIT: 953 if (a->speed > SCODE_3200) 954 return -EINVAL; 955 break; 956 957 default: 958 return -EINVAL; 959 } 960 961 context = fw_iso_context_create(client->device->card, a->type, 962 a->channel, a->speed, a->header_size, 963 iso_callback, client); 964 if (IS_ERR(context)) 965 return PTR_ERR(context); 966 967 /* We only support one context at this time. */ 968 spin_lock_irq(&client->lock); 969 if (client->iso_context != NULL) { 970 spin_unlock_irq(&client->lock); 971 fw_iso_context_destroy(context); 972 return -EBUSY; 973 } 974 client->iso_closure = a->closure; 975 client->iso_context = context; 976 spin_unlock_irq(&client->lock); 977 978 a->handle = 0; 979 980 return 0; 981} 982 983/* Macros for decoding the iso packet control header. */ 984#define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) 985#define GET_INTERRUPT(v) (((v) >> 16) & 0x01) 986#define GET_SKIP(v) (((v) >> 17) & 0x01) 987#define GET_TAG(v) (((v) >> 18) & 0x03) 988#define GET_SY(v) (((v) >> 20) & 0x0f) 989#define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) 990 991static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 992{ 993 struct fw_cdev_queue_iso *a = &arg->queue_iso; 994 struct fw_cdev_iso_packet __user *p, *end, *next; 995 struct fw_iso_context *ctx = client->iso_context; 996 unsigned long payload, buffer_end, transmit_header_bytes; 997 u32 control; 998 int count; 999 struct { 1000 struct fw_iso_packet packet; 1001 u8 header[256]; 1002 } u; 1003 1004 if (ctx == NULL || a->handle != 0) 1005 return -EINVAL; 1006 1007 /* 1008 * If the user passes a non-NULL data pointer, has mmap()'ed 1009 * the iso buffer, and the pointer points inside the buffer, 1010 * we setup the payload pointers accordingly. Otherwise we 1011 * set them both to 0, which will still let packets with 1012 * payload_length == 0 through. In other words, if no packets 1013 * use the indirect payload, the iso buffer need not be mapped 1014 * and the a->data pointer is ignored. 1015 */ 1016 1017 payload = (unsigned long)a->data - client->vm_start; 1018 buffer_end = client->buffer.page_count << PAGE_SHIFT; 1019 if (a->data == 0 || client->buffer.pages == NULL || 1020 payload >= buffer_end) { 1021 payload = 0; 1022 buffer_end = 0; 1023 } 1024 1025 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets); 1026 1027 if (!access_ok(VERIFY_READ, p, a->size)) 1028 return -EFAULT; 1029 1030 end = (void __user *)p + a->size; 1031 count = 0; 1032 while (p < end) { 1033 if (get_user(control, &p->control)) 1034 return -EFAULT; 1035 u.packet.payload_length = GET_PAYLOAD_LENGTH(control); 1036 u.packet.interrupt = GET_INTERRUPT(control); 1037 u.packet.skip = GET_SKIP(control); 1038 u.packet.tag = GET_TAG(control); 1039 u.packet.sy = GET_SY(control); 1040 u.packet.header_length = GET_HEADER_LENGTH(control); 1041 1042 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) { 1043 if (u.packet.header_length % 4 != 0) 1044 return -EINVAL; 1045 transmit_header_bytes = u.packet.header_length; 1046 } else { 1047 /* 1048 * We require that header_length is a multiple of 1049 * the fixed header size, ctx->header_size. 1050 */ 1051 if (u.packet.header_length == 0 || 1052 u.packet.header_length % ctx->header_size != 0) 1053 return -EINVAL; 1054 transmit_header_bytes = 0; 1055 } 1056 1057 next = (struct fw_cdev_iso_packet __user *) 1058 &p->header[transmit_header_bytes / 4]; 1059 if (next > end) 1060 return -EINVAL; 1061 if (__copy_from_user 1062 (u.packet.header, p->header, transmit_header_bytes)) 1063 return -EFAULT; 1064 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && 1065 u.packet.header_length + u.packet.payload_length > 0) 1066 return -EINVAL; 1067 if (payload + u.packet.payload_length > buffer_end) 1068 return -EINVAL; 1069 1070 if (fw_iso_context_queue(ctx, &u.packet, 1071 &client->buffer, payload)) 1072 break; 1073 1074 p = next; 1075 payload += u.packet.payload_length; 1076 count++; 1077 } 1078 1079 a->size -= uptr_to_u64(p) - a->packets; 1080 a->packets = uptr_to_u64(p); 1081 a->data = client->vm_start + payload; 1082 1083 return count; 1084} 1085 1086static int ioctl_start_iso(struct client *client, union ioctl_arg *arg) 1087{ 1088 struct fw_cdev_start_iso *a = &arg->start_iso; 1089 1090 BUILD_BUG_ON( 1091 FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 || 1092 FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 || 1093 FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 || 1094 FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 || 1095 FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS); 1096 1097 if (client->iso_context == NULL || a->handle != 0) 1098 return -EINVAL; 1099 1100 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE && 1101 (a->tags == 0 || a->tags > 15 || a->sync > 15)) 1102 return -EINVAL; 1103 1104 return fw_iso_context_start(client->iso_context, 1105 a->cycle, a->sync, a->tags); 1106} 1107 1108static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg) 1109{ 1110 struct fw_cdev_stop_iso *a = &arg->stop_iso; 1111 1112 if (client->iso_context == NULL || a->handle != 0) 1113 return -EINVAL; 1114 1115 return fw_iso_context_stop(client->iso_context); 1116} 1117 1118static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg) 1119{ 1120 struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2; 1121 struct fw_card *card = client->device->card; 1122 struct timespec ts = {0, 0}; 1123 u32 cycle_time; 1124 int ret = 0; 1125 1126 local_irq_disable(); 1127 1128 cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME); 1129 1130 switch (a->clk_id) { 1131 case CLOCK_REALTIME: getnstimeofday(&ts); break; 1132 case CLOCK_MONOTONIC: do_posix_clock_monotonic_gettime(&ts); break; 1133 case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts); break; 1134 default: 1135 ret = -EINVAL; 1136 } 1137 1138 local_irq_enable(); 1139 1140 a->tv_sec = ts.tv_sec; 1141 a->tv_nsec = ts.tv_nsec; 1142 a->cycle_timer = cycle_time; 1143 1144 return ret; 1145} 1146 1147static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg) 1148{ 1149 struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer; 1150 struct fw_cdev_get_cycle_timer2 ct2; 1151 1152 ct2.clk_id = CLOCK_REALTIME; 1153 ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2); 1154 1155 a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC; 1156 a->cycle_timer = ct2.cycle_timer; 1157 1158 return 0; 1159} 1160 1161static void iso_resource_work(struct work_struct *work) 1162{ 1163 struct iso_resource_event *e; 1164 struct iso_resource *r = 1165 container_of(work, struct iso_resource, work.work); 1166 struct client *client = r->client; 1167 int generation, channel, bandwidth, todo; 1168 bool skip, free, success; 1169 1170 spin_lock_irq(&client->lock); 1171 generation = client->device->generation; 1172 todo = r->todo; 1173 /* Allow 1000ms grace period for other reallocations. */ 1174 if (todo == ISO_RES_ALLOC && 1175 time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) { 1176 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3)); 1177 skip = true; 1178 } else { 1179 /* We could be called twice within the same generation. */ 1180 skip = todo == ISO_RES_REALLOC && 1181 r->generation == generation; 1182 } 1183 free = todo == ISO_RES_DEALLOC || 1184 todo == ISO_RES_ALLOC_ONCE || 1185 todo == ISO_RES_DEALLOC_ONCE; 1186 r->generation = generation; 1187 spin_unlock_irq(&client->lock); 1188 1189 if (skip) 1190 goto out; 1191 1192 bandwidth = r->bandwidth; 1193 1194 fw_iso_resource_manage(client->device->card, generation, 1195 r->channels, &channel, &bandwidth, 1196 todo == ISO_RES_ALLOC || 1197 todo == ISO_RES_REALLOC || 1198 todo == ISO_RES_ALLOC_ONCE, 1199 r->transaction_data); 1200 /* 1201 * Is this generation outdated already? As long as this resource sticks 1202 * in the idr, it will be scheduled again for a newer generation or at 1203 * shutdown. 1204 */ 1205 if (channel == -EAGAIN && 1206 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC)) 1207 goto out; 1208 1209 success = channel >= 0 || bandwidth > 0; 1210 1211 spin_lock_irq(&client->lock); 1212 /* 1213 * Transit from allocation to reallocation, except if the client 1214 * requested deallocation in the meantime. 1215 */ 1216 if (r->todo == ISO_RES_ALLOC) 1217 r->todo = ISO_RES_REALLOC; 1218 /* 1219 * Allocation or reallocation failure? Pull this resource out of the 1220 * idr and prepare for deletion, unless the client is shutting down. 1221 */ 1222 if (r->todo == ISO_RES_REALLOC && !success && 1223 !client->in_shutdown && 1224 idr_find(&client->resource_idr, r->resource.handle)) { 1225 idr_remove(&client->resource_idr, r->resource.handle); 1226 client_put(client); 1227 free = true; 1228 } 1229 spin_unlock_irq(&client->lock); 1230 1231 if (todo == ISO_RES_ALLOC && channel >= 0) 1232 r->channels = 1ULL << channel; 1233 1234 if (todo == ISO_RES_REALLOC && success) 1235 goto out; 1236 1237 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) { 1238 e = r->e_alloc; 1239 r->e_alloc = NULL; 1240 } else { 1241 e = r->e_dealloc; 1242 r->e_dealloc = NULL; 1243 } 1244 e->iso_resource.handle = r->resource.handle; 1245 e->iso_resource.channel = channel; 1246 e->iso_resource.bandwidth = bandwidth; 1247 1248 queue_event(client, &e->event, 1249 &e->iso_resource, sizeof(e->iso_resource), NULL, 0); 1250 1251 if (free) { 1252 cancel_delayed_work(&r->work); 1253 kfree(r->e_alloc); 1254 kfree(r->e_dealloc); 1255 kfree(r); 1256 } 1257 out: 1258 client_put(client); 1259} 1260 1261static void release_iso_resource(struct client *client, 1262 struct client_resource *resource) 1263{ 1264 struct iso_resource *r = 1265 container_of(resource, struct iso_resource, resource); 1266 1267 spin_lock_irq(&client->lock); 1268 r->todo = ISO_RES_DEALLOC; 1269 schedule_iso_resource(r, 0); 1270 spin_unlock_irq(&client->lock); 1271} 1272 1273static int init_iso_resource(struct client *client, 1274 struct fw_cdev_allocate_iso_resource *request, int todo) 1275{ 1276 struct iso_resource_event *e1, *e2; 1277 struct iso_resource *r; 1278 int ret; 1279 1280 if ((request->channels == 0 && request->bandwidth == 0) || 1281 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL || 1282 request->bandwidth < 0) 1283 return -EINVAL; 1284 1285 r = kmalloc(sizeof(*r), GFP_KERNEL); 1286 e1 = kmalloc(sizeof(*e1), GFP_KERNEL); 1287 e2 = kmalloc(sizeof(*e2), GFP_KERNEL); 1288 if (r == NULL || e1 == NULL || e2 == NULL) { 1289 ret = -ENOMEM; 1290 goto fail; 1291 } 1292 1293 INIT_DELAYED_WORK(&r->work, iso_resource_work); 1294 r->client = client; 1295 r->todo = todo; 1296 r->generation = -1; 1297 r->channels = request->channels; 1298 r->bandwidth = request->bandwidth; 1299 r->e_alloc = e1; 1300 r->e_dealloc = e2; 1301 1302 e1->iso_resource.closure = request->closure; 1303 e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED; 1304 e2->iso_resource.closure = request->closure; 1305 e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED; 1306 1307 if (todo == ISO_RES_ALLOC) { 1308 r->resource.release = release_iso_resource; 1309 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 1310 if (ret < 0) 1311 goto fail; 1312 } else { 1313 r->resource.release = NULL; 1314 r->resource.handle = -1; 1315 schedule_iso_resource(r, 0); 1316 } 1317 request->handle = r->resource.handle; 1318 1319 return 0; 1320 fail: 1321 kfree(r); 1322 kfree(e1); 1323 kfree(e2); 1324 1325 return ret; 1326} 1327 1328static int ioctl_allocate_iso_resource(struct client *client, 1329 union ioctl_arg *arg) 1330{ 1331 return init_iso_resource(client, 1332 &arg->allocate_iso_resource, ISO_RES_ALLOC); 1333} 1334 1335static int ioctl_deallocate_iso_resource(struct client *client, 1336 union ioctl_arg *arg) 1337{ 1338 return release_client_resource(client, 1339 arg->deallocate.handle, release_iso_resource, NULL); 1340} 1341 1342static int ioctl_allocate_iso_resource_once(struct client *client, 1343 union ioctl_arg *arg) 1344{ 1345 return init_iso_resource(client, 1346 &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE); 1347} 1348 1349static int ioctl_deallocate_iso_resource_once(struct client *client, 1350 union ioctl_arg *arg) 1351{ 1352 return init_iso_resource(client, 1353 &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE); 1354} 1355 1356/* 1357 * Returns a speed code: Maximum speed to or from this device, 1358 * limited by the device's link speed, the local node's link speed, 1359 * and all PHY port speeds between the two links. 1360 */ 1361static int ioctl_get_speed(struct client *client, union ioctl_arg *arg) 1362{ 1363 return client->device->max_speed; 1364} 1365 1366static int ioctl_send_broadcast_request(struct client *client, 1367 union ioctl_arg *arg) 1368{ 1369 struct fw_cdev_send_request *a = &arg->send_request; 1370 1371 switch (a->tcode) { 1372 case TCODE_WRITE_QUADLET_REQUEST: 1373 case TCODE_WRITE_BLOCK_REQUEST: 1374 break; 1375 default: 1376 return -EINVAL; 1377 } 1378 1379 /* Security policy: Only allow accesses to Units Space. */ 1380 if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END) 1381 return -EACCES; 1382 1383 return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100); 1384} 1385 1386static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg) 1387{ 1388 struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet; 1389 struct fw_cdev_send_request request; 1390 int dest; 1391 1392 if (a->speed > client->device->card->link_speed || 1393 a->length > 1024 << a->speed) 1394 return -EIO; 1395 1396 if (a->tag > 3 || a->channel > 63 || a->sy > 15) 1397 return -EINVAL; 1398 1399 dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy); 1400 request.tcode = TCODE_STREAM_DATA; 1401 request.length = a->length; 1402 request.closure = a->closure; 1403 request.data = a->data; 1404 request.generation = a->generation; 1405 1406 return init_request(client, &request, dest, a->speed); 1407} 1408 1409static void outbound_phy_packet_callback(struct fw_packet *packet, 1410 struct fw_card *card, int status) 1411{ 1412 struct outbound_phy_packet_event *e = 1413 container_of(packet, struct outbound_phy_packet_event, p); 1414 1415 switch (status) { 1416 /* expected: */ 1417 case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break; 1418 /* should never happen with PHY packets: */ 1419 case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break; 1420 case ACK_BUSY_X: 1421 case ACK_BUSY_A: 1422 case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break; 1423 case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break; 1424 case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break; 1425 /* stale generation; cancelled; on certain controllers: no ack */ 1426 default: e->phy_packet.rcode = status; break; 1427 } 1428 e->phy_packet.data[0] = packet->timestamp; 1429 1430 queue_event(e->client, &e->event, &e->phy_packet, 1431 sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); 1432 client_put(e->client); 1433} 1434 1435static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) 1436{ 1437 struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet; 1438 struct fw_card *card = client->device->card; 1439 struct outbound_phy_packet_event *e; 1440 1441 /* Access policy: Allow this ioctl only on local nodes' device files. */ 1442 if (!client->device->is_local) 1443 return -ENOSYS; 1444 1445 e = kzalloc(sizeof(*e) + 4, GFP_KERNEL); 1446 if (e == NULL) 1447 return -ENOMEM; 1448 1449 client_get(client); 1450 e->client = client; 1451 e->p.speed = SCODE_100; 1452 e->p.generation = a->generation; 1453 e->p.header[0] = a->data[0]; 1454 e->p.header[1] = a->data[1]; 1455 e->p.header_length = 8; 1456 e->p.callback = outbound_phy_packet_callback; 1457 e->phy_packet.closure = a->closure; 1458 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT; 1459 if (is_ping_packet(a->data)) 1460 e->phy_packet.length = 4; 1461 1462 card->driver->send_request(card, &e->p); 1463 1464 return 0; 1465} 1466 1467static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg) 1468{ 1469 struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets; 1470 struct fw_card *card = client->device->card; 1471 1472 /* Access policy: Allow this ioctl only on local nodes' device files. */ 1473 if (!client->device->is_local) 1474 return -ENOSYS; 1475 1476 spin_lock_irq(&card->lock); 1477 1478 list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list); 1479 client->phy_receiver_closure = a->closure; 1480 1481 spin_unlock_irq(&card->lock); 1482 1483 return 0; 1484} 1485 1486void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p) 1487{ 1488 struct client *client; 1489 struct inbound_phy_packet_event *e; 1490 unsigned long flags; 1491 1492 spin_lock_irqsave(&card->lock, flags); 1493 1494 list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) { 1495 e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC); 1496 if (e == NULL) { 1497 fw_notify("Out of memory when allocating event\n"); 1498 break; 1499 } 1500 e->phy_packet.closure = client->phy_receiver_closure; 1501 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED; 1502 e->phy_packet.rcode = RCODE_COMPLETE; 1503 e->phy_packet.length = 8; 1504 e->phy_packet.data[0] = p->header[1]; 1505 e->phy_packet.data[1] = p->header[2]; 1506 queue_event(client, &e->event, 1507 &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0); 1508 } 1509 1510 spin_unlock_irqrestore(&card->lock, flags); 1511} 1512 1513static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = { 1514 [0x00] = ioctl_get_info, 1515 [0x01] = ioctl_send_request, 1516 [0x02] = ioctl_allocate, 1517 [0x03] = ioctl_deallocate, 1518 [0x04] = ioctl_send_response, 1519 [0x05] = ioctl_initiate_bus_reset, 1520 [0x06] = ioctl_add_descriptor, 1521 [0x07] = ioctl_remove_descriptor, 1522 [0x08] = ioctl_create_iso_context, 1523 [0x09] = ioctl_queue_iso, 1524 [0x0a] = ioctl_start_iso, 1525 [0x0b] = ioctl_stop_iso, 1526 [0x0c] = ioctl_get_cycle_timer, 1527 [0x0d] = ioctl_allocate_iso_resource, 1528 [0x0e] = ioctl_deallocate_iso_resource, 1529 [0x0f] = ioctl_allocate_iso_resource_once, 1530 [0x10] = ioctl_deallocate_iso_resource_once, 1531 [0x11] = ioctl_get_speed, 1532 [0x12] = ioctl_send_broadcast_request, 1533 [0x13] = ioctl_send_stream_packet, 1534 [0x14] = ioctl_get_cycle_timer2, 1535 [0x15] = ioctl_send_phy_packet, 1536 [0x16] = ioctl_receive_phy_packets, 1537}; 1538 1539static int dispatch_ioctl(struct client *client, 1540 unsigned int cmd, void __user *arg) 1541{ 1542 union ioctl_arg buffer; 1543 int ret; 1544 1545 if (fw_device_is_shutdown(client->device)) 1546 return -ENODEV; 1547 1548 if (_IOC_TYPE(cmd) != '#' || 1549 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) || 1550 _IOC_SIZE(cmd) > sizeof(buffer)) 1551 return -EINVAL; 1552 1553 if (_IOC_DIR(cmd) == _IOC_READ) 1554 memset(&buffer, 0, _IOC_SIZE(cmd)); 1555 1556 if (_IOC_DIR(cmd) & _IOC_WRITE) 1557 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd))) 1558 return -EFAULT; 1559 1560 ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer); 1561 if (ret < 0) 1562 return ret; 1563 1564 if (_IOC_DIR(cmd) & _IOC_READ) 1565 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd))) 1566 return -EFAULT; 1567 1568 return ret; 1569} 1570 1571static long fw_device_op_ioctl(struct file *file, 1572 unsigned int cmd, unsigned long arg) 1573{ 1574 return dispatch_ioctl(file->private_data, cmd, (void __user *)arg); 1575} 1576 1577#ifdef CONFIG_COMPAT 1578static long fw_device_op_compat_ioctl(struct file *file, 1579 unsigned int cmd, unsigned long arg) 1580{ 1581 return dispatch_ioctl(file->private_data, cmd, compat_ptr(arg)); 1582} 1583#endif 1584 1585static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) 1586{ 1587 struct client *client = file->private_data; 1588 enum dma_data_direction direction; 1589 unsigned long size; 1590 int page_count, ret; 1591 1592 if (fw_device_is_shutdown(client->device)) 1593 return -ENODEV; 1594 1595 /* FIXME: We could support multiple buffers, but we don't. */ 1596 if (client->buffer.pages != NULL) 1597 return -EBUSY; 1598 1599 if (!(vma->vm_flags & VM_SHARED)) 1600 return -EINVAL; 1601 1602 if (vma->vm_start & ~PAGE_MASK) 1603 return -EINVAL; 1604 1605 client->vm_start = vma->vm_start; 1606 size = vma->vm_end - vma->vm_start; 1607 page_count = size >> PAGE_SHIFT; 1608 if (size & ~PAGE_MASK) 1609 return -EINVAL; 1610 1611 if (vma->vm_flags & VM_WRITE) 1612 direction = DMA_TO_DEVICE; 1613 else 1614 direction = DMA_FROM_DEVICE; 1615 1616 ret = fw_iso_buffer_init(&client->buffer, client->device->card, 1617 page_count, direction); 1618 if (ret < 0) 1619 return ret; 1620 1621 ret = fw_iso_buffer_map(&client->buffer, vma); 1622 if (ret < 0) 1623 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1624 1625 return ret; 1626} 1627 1628static int shutdown_resource(int id, void *p, void *data) 1629{ 1630 struct client_resource *resource = p; 1631 struct client *client = data; 1632 1633 resource->release(client, resource); 1634 client_put(client); 1635 1636 return 0; 1637} 1638 1639static int fw_device_op_release(struct inode *inode, struct file *file) 1640{ 1641 struct client *client = file->private_data; 1642 struct event *event, *next_event; 1643 1644 spin_lock_irq(&client->device->card->lock); 1645 list_del(&client->phy_receiver_link); 1646 spin_unlock_irq(&client->device->card->lock); 1647 1648 mutex_lock(&client->device->client_list_mutex); 1649 list_del(&client->link); 1650 mutex_unlock(&client->device->client_list_mutex); 1651 1652 if (client->iso_context) 1653 fw_iso_context_destroy(client->iso_context); 1654 1655 if (client->buffer.pages) 1656 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1657 1658 /* Freeze client->resource_idr and client->event_list */ 1659 spin_lock_irq(&client->lock); 1660 client->in_shutdown = true; 1661 spin_unlock_irq(&client->lock); 1662 1663 idr_for_each(&client->resource_idr, shutdown_resource, client); 1664 idr_remove_all(&client->resource_idr); 1665 idr_destroy(&client->resource_idr); 1666 1667 list_for_each_entry_safe(event, next_event, &client->event_list, link) 1668 kfree(event); 1669 1670 client_put(client); 1671 1672 return 0; 1673} 1674 1675static unsigned int fw_device_op_poll(struct file *file, poll_table * pt) 1676{ 1677 struct client *client = file->private_data; 1678 unsigned int mask = 0; 1679 1680 poll_wait(file, &client->wait, pt); 1681 1682 if (fw_device_is_shutdown(client->device)) 1683 mask |= POLLHUP | POLLERR; 1684 if (!list_empty(&client->event_list)) 1685 mask |= POLLIN | POLLRDNORM; 1686 1687 return mask; 1688} 1689 1690const struct file_operations fw_device_ops = { 1691 .owner = THIS_MODULE, 1692 .llseek = no_llseek, 1693 .open = fw_device_op_open, 1694 .read = fw_device_op_read, 1695 .unlocked_ioctl = fw_device_op_ioctl, 1696 .mmap = fw_device_op_mmap, 1697 .release = fw_device_op_release, 1698 .poll = fw_device_op_poll, 1699#ifdef CONFIG_COMPAT 1700 .compat_ioctl = fw_device_op_compat_ioctl, 1701#endif 1702}; 1703