core-cdev.c revision 1f3125af8ed7410cc0ebcc0acd59bbfc1ae0057a
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/module.h> 22#include <linux/kernel.h> 23#include <linux/wait.h> 24#include <linux/errno.h> 25#include <linux/device.h> 26#include <linux/vmalloc.h> 27#include <linux/mutex.h> 28#include <linux/poll.h> 29#include <linux/preempt.h> 30#include <linux/time.h> 31#include <linux/spinlock.h> 32#include <linux/delay.h> 33#include <linux/mm.h> 34#include <linux/idr.h> 35#include <linux/compat.h> 36#include <linux/firewire-cdev.h> 37#include <asm/system.h> 38#include <asm/uaccess.h> 39#include "fw-transaction.h" 40#include "fw-topology.h" 41#include "fw-device.h" 42 43struct client; 44struct client_resource { 45 struct list_head link; 46 void (*release)(struct client *client, struct client_resource *r); 47 u32 handle; 48}; 49 50/* 51 * dequeue_event() just kfree()'s the event, so the event has to be 52 * the first field in the struct. 53 */ 54 55struct event { 56 struct { void *data; size_t size; } v[2]; 57 struct list_head link; 58}; 59 60struct bus_reset { 61 struct event event; 62 struct fw_cdev_event_bus_reset reset; 63}; 64 65struct response { 66 struct event event; 67 struct fw_transaction transaction; 68 struct client *client; 69 struct client_resource resource; 70 struct fw_cdev_event_response response; 71}; 72 73struct iso_interrupt { 74 struct event event; 75 struct fw_cdev_event_iso_interrupt interrupt; 76}; 77 78struct client { 79 u32 version; 80 struct fw_device *device; 81 spinlock_t lock; 82 u32 resource_handle; 83 struct list_head resource_list; 84 struct list_head event_list; 85 wait_queue_head_t wait; 86 u64 bus_reset_closure; 87 88 struct fw_iso_context *iso_context; 89 u64 iso_closure; 90 struct fw_iso_buffer buffer; 91 unsigned long vm_start; 92 93 struct list_head link; 94}; 95 96static inline void __user * 97u64_to_uptr(__u64 value) 98{ 99 return (void __user *)(unsigned long)value; 100} 101 102static inline __u64 103uptr_to_u64(void __user *ptr) 104{ 105 return (__u64)(unsigned long)ptr; 106} 107 108static int fw_device_op_open(struct inode *inode, struct file *file) 109{ 110 struct fw_device *device; 111 struct client *client; 112 113 device = fw_device_get_by_devt(inode->i_rdev); 114 if (device == NULL) 115 return -ENODEV; 116 117 if (fw_device_is_shutdown(device)) { 118 fw_device_put(device); 119 return -ENODEV; 120 } 121 122 client = kzalloc(sizeof(*client), GFP_KERNEL); 123 if (client == NULL) { 124 fw_device_put(device); 125 return -ENOMEM; 126 } 127 128 client->device = device; 129 INIT_LIST_HEAD(&client->event_list); 130 INIT_LIST_HEAD(&client->resource_list); 131 spin_lock_init(&client->lock); 132 init_waitqueue_head(&client->wait); 133 134 file->private_data = client; 135 136 mutex_lock(&device->client_list_mutex); 137 list_add_tail(&client->link, &device->client_list); 138 mutex_unlock(&device->client_list_mutex); 139 140 return 0; 141} 142 143static void queue_event(struct client *client, struct event *event, 144 void *data0, size_t size0, void *data1, size_t size1) 145{ 146 unsigned long flags; 147 148 event->v[0].data = data0; 149 event->v[0].size = size0; 150 event->v[1].data = data1; 151 event->v[1].size = size1; 152 153 spin_lock_irqsave(&client->lock, flags); 154 list_add_tail(&event->link, &client->event_list); 155 spin_unlock_irqrestore(&client->lock, flags); 156 157 wake_up_interruptible(&client->wait); 158} 159 160static int 161dequeue_event(struct client *client, char __user *buffer, size_t count) 162{ 163 unsigned long flags; 164 struct event *event; 165 size_t size, total; 166 int i, retval; 167 168 retval = wait_event_interruptible(client->wait, 169 !list_empty(&client->event_list) || 170 fw_device_is_shutdown(client->device)); 171 if (retval < 0) 172 return retval; 173 174 if (list_empty(&client->event_list) && 175 fw_device_is_shutdown(client->device)) 176 return -ENODEV; 177 178 spin_lock_irqsave(&client->lock, flags); 179 event = container_of(client->event_list.next, struct event, link); 180 list_del(&event->link); 181 spin_unlock_irqrestore(&client->lock, flags); 182 183 total = 0; 184 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { 185 size = min(event->v[i].size, count - total); 186 if (copy_to_user(buffer + total, event->v[i].data, size)) { 187 retval = -EFAULT; 188 goto out; 189 } 190 total += size; 191 } 192 retval = total; 193 194 out: 195 kfree(event); 196 197 return retval; 198} 199 200static ssize_t 201fw_device_op_read(struct file *file, 202 char __user *buffer, size_t count, loff_t *offset) 203{ 204 struct client *client = file->private_data; 205 206 return dequeue_event(client, buffer, count); 207} 208 209static void 210fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, 211 struct client *client) 212{ 213 struct fw_card *card = client->device->card; 214 unsigned long flags; 215 216 spin_lock_irqsave(&card->lock, flags); 217 218 event->closure = client->bus_reset_closure; 219 event->type = FW_CDEV_EVENT_BUS_RESET; 220 event->generation = client->device->generation; 221 event->node_id = client->device->node_id; 222 event->local_node_id = card->local_node->node_id; 223 event->bm_node_id = 0; /* FIXME: We don't track the BM. */ 224 event->irm_node_id = card->irm_node->node_id; 225 event->root_node_id = card->root_node->node_id; 226 227 spin_unlock_irqrestore(&card->lock, flags); 228} 229 230static void 231for_each_client(struct fw_device *device, 232 void (*callback)(struct client *client)) 233{ 234 struct client *c; 235 236 mutex_lock(&device->client_list_mutex); 237 list_for_each_entry(c, &device->client_list, link) 238 callback(c); 239 mutex_unlock(&device->client_list_mutex); 240} 241 242static void 243queue_bus_reset_event(struct client *client) 244{ 245 struct bus_reset *bus_reset; 246 247 bus_reset = kzalloc(sizeof(*bus_reset), GFP_KERNEL); 248 if (bus_reset == NULL) { 249 fw_notify("Out of memory when allocating bus reset event\n"); 250 return; 251 } 252 253 fill_bus_reset_event(&bus_reset->reset, client); 254 255 queue_event(client, &bus_reset->event, 256 &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0); 257} 258 259void fw_device_cdev_update(struct fw_device *device) 260{ 261 for_each_client(device, queue_bus_reset_event); 262} 263 264static void wake_up_client(struct client *client) 265{ 266 wake_up_interruptible(&client->wait); 267} 268 269void fw_device_cdev_remove(struct fw_device *device) 270{ 271 for_each_client(device, wake_up_client); 272} 273 274static int ioctl_get_info(struct client *client, void *buffer) 275{ 276 struct fw_cdev_get_info *get_info = buffer; 277 struct fw_cdev_event_bus_reset bus_reset; 278 unsigned long ret = 0; 279 280 client->version = get_info->version; 281 get_info->version = FW_CDEV_VERSION; 282 get_info->card = client->device->card->index; 283 284 down_read(&fw_device_rwsem); 285 286 if (get_info->rom != 0) { 287 void __user *uptr = u64_to_uptr(get_info->rom); 288 size_t want = get_info->rom_length; 289 size_t have = client->device->config_rom_length * 4; 290 291 ret = copy_to_user(uptr, client->device->config_rom, 292 min(want, have)); 293 } 294 get_info->rom_length = client->device->config_rom_length * 4; 295 296 up_read(&fw_device_rwsem); 297 298 if (ret != 0) 299 return -EFAULT; 300 301 client->bus_reset_closure = get_info->bus_reset_closure; 302 if (get_info->bus_reset != 0) { 303 void __user *uptr = u64_to_uptr(get_info->bus_reset); 304 305 fill_bus_reset_event(&bus_reset, client); 306 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset))) 307 return -EFAULT; 308 } 309 310 return 0; 311} 312 313static void 314add_client_resource(struct client *client, struct client_resource *resource) 315{ 316 unsigned long flags; 317 318 spin_lock_irqsave(&client->lock, flags); 319 list_add_tail(&resource->link, &client->resource_list); 320 resource->handle = client->resource_handle++; 321 spin_unlock_irqrestore(&client->lock, flags); 322} 323 324static int 325release_client_resource(struct client *client, u32 handle, 326 struct client_resource **resource) 327{ 328 struct client_resource *r; 329 unsigned long flags; 330 331 spin_lock_irqsave(&client->lock, flags); 332 list_for_each_entry(r, &client->resource_list, link) { 333 if (r->handle == handle) { 334 list_del(&r->link); 335 break; 336 } 337 } 338 spin_unlock_irqrestore(&client->lock, flags); 339 340 if (&r->link == &client->resource_list) 341 return -EINVAL; 342 343 if (resource) 344 *resource = r; 345 else 346 r->release(client, r); 347 348 return 0; 349} 350 351static void 352release_transaction(struct client *client, struct client_resource *resource) 353{ 354 struct response *response = 355 container_of(resource, struct response, resource); 356 357 fw_cancel_transaction(client->device->card, &response->transaction); 358} 359 360static void 361complete_transaction(struct fw_card *card, int rcode, 362 void *payload, size_t length, void *data) 363{ 364 struct response *response = data; 365 struct client *client = response->client; 366 unsigned long flags; 367 struct fw_cdev_event_response *r = &response->response; 368 369 if (length < r->length) 370 r->length = length; 371 if (rcode == RCODE_COMPLETE) 372 memcpy(r->data, payload, r->length); 373 374 spin_lock_irqsave(&client->lock, flags); 375 list_del(&response->resource.link); 376 spin_unlock_irqrestore(&client->lock, flags); 377 378 r->type = FW_CDEV_EVENT_RESPONSE; 379 r->rcode = rcode; 380 381 /* 382 * In the case that sizeof(*r) doesn't align with the position of the 383 * data, and the read is short, preserve an extra copy of the data 384 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless 385 * for short reads and some apps depended on it, this is both safe 386 * and prudent for compatibility. 387 */ 388 if (r->length <= sizeof(*r) - offsetof(typeof(*r), data)) 389 queue_event(client, &response->event, r, sizeof(*r), 390 r->data, r->length); 391 else 392 queue_event(client, &response->event, r, sizeof(*r) + r->length, 393 NULL, 0); 394} 395 396static int ioctl_send_request(struct client *client, void *buffer) 397{ 398 struct fw_device *device = client->device; 399 struct fw_cdev_send_request *request = buffer; 400 struct response *response; 401 int ret; 402 403 /* What is the biggest size we'll accept, really? */ 404 if (request->length > 4096) 405 return -EINVAL; 406 407 response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL); 408 if (response == NULL) 409 return -ENOMEM; 410 411 response->client = client; 412 response->response.length = request->length; 413 response->response.closure = request->closure; 414 415 if (request->data && 416 copy_from_user(response->response.data, 417 u64_to_uptr(request->data), request->length)) { 418 ret = -EFAULT; 419 goto err; 420 } 421 422 switch (request->tcode) { 423 case TCODE_WRITE_QUADLET_REQUEST: 424 case TCODE_WRITE_BLOCK_REQUEST: 425 case TCODE_READ_QUADLET_REQUEST: 426 case TCODE_READ_BLOCK_REQUEST: 427 case TCODE_LOCK_MASK_SWAP: 428 case TCODE_LOCK_COMPARE_SWAP: 429 case TCODE_LOCK_FETCH_ADD: 430 case TCODE_LOCK_LITTLE_ADD: 431 case TCODE_LOCK_BOUNDED_ADD: 432 case TCODE_LOCK_WRAP_ADD: 433 case TCODE_LOCK_VENDOR_DEPENDENT: 434 break; 435 default: 436 ret = -EINVAL; 437 goto err; 438 } 439 440 response->resource.release = release_transaction; 441 add_client_resource(client, &response->resource); 442 443 fw_send_request(device->card, &response->transaction, 444 request->tcode & 0x1f, 445 device->node->node_id, 446 request->generation, 447 device->max_speed, 448 request->offset, 449 response->response.data, request->length, 450 complete_transaction, response); 451 452 if (request->data) 453 return sizeof(request) + request->length; 454 else 455 return sizeof(request); 456 err: 457 kfree(response); 458 459 return ret; 460} 461 462struct address_handler { 463 struct fw_address_handler handler; 464 __u64 closure; 465 struct client *client; 466 struct client_resource resource; 467}; 468 469struct request { 470 struct fw_request *request; 471 void *data; 472 size_t length; 473 struct client_resource resource; 474}; 475 476struct request_event { 477 struct event event; 478 struct fw_cdev_event_request request; 479}; 480 481static void 482release_request(struct client *client, struct client_resource *resource) 483{ 484 struct request *request = 485 container_of(resource, struct request, resource); 486 487 fw_send_response(client->device->card, request->request, 488 RCODE_CONFLICT_ERROR); 489 kfree(request); 490} 491 492static void 493handle_request(struct fw_card *card, struct fw_request *r, 494 int tcode, int destination, int source, 495 int generation, int speed, 496 unsigned long long offset, 497 void *payload, size_t length, void *callback_data) 498{ 499 struct address_handler *handler = callback_data; 500 struct request *request; 501 struct request_event *e; 502 struct client *client = handler->client; 503 504 request = kmalloc(sizeof(*request), GFP_ATOMIC); 505 e = kmalloc(sizeof(*e), GFP_ATOMIC); 506 if (request == NULL || e == NULL) { 507 kfree(request); 508 kfree(e); 509 fw_send_response(card, r, RCODE_CONFLICT_ERROR); 510 return; 511 } 512 513 request->request = r; 514 request->data = payload; 515 request->length = length; 516 517 request->resource.release = release_request; 518 add_client_resource(client, &request->resource); 519 520 e->request.type = FW_CDEV_EVENT_REQUEST; 521 e->request.tcode = tcode; 522 e->request.offset = offset; 523 e->request.length = length; 524 e->request.handle = request->resource.handle; 525 e->request.closure = handler->closure; 526 527 queue_event(client, &e->event, 528 &e->request, sizeof(e->request), payload, length); 529} 530 531static void 532release_address_handler(struct client *client, 533 struct client_resource *resource) 534{ 535 struct address_handler *handler = 536 container_of(resource, struct address_handler, resource); 537 538 fw_core_remove_address_handler(&handler->handler); 539 kfree(handler); 540} 541 542static int ioctl_allocate(struct client *client, void *buffer) 543{ 544 struct fw_cdev_allocate *request = buffer; 545 struct address_handler *handler; 546 struct fw_address_region region; 547 548 handler = kmalloc(sizeof(*handler), GFP_KERNEL); 549 if (handler == NULL) 550 return -ENOMEM; 551 552 region.start = request->offset; 553 region.end = request->offset + request->length; 554 handler->handler.length = request->length; 555 handler->handler.address_callback = handle_request; 556 handler->handler.callback_data = handler; 557 handler->closure = request->closure; 558 handler->client = client; 559 560 if (fw_core_add_address_handler(&handler->handler, ®ion) < 0) { 561 kfree(handler); 562 return -EBUSY; 563 } 564 565 handler->resource.release = release_address_handler; 566 add_client_resource(client, &handler->resource); 567 request->handle = handler->resource.handle; 568 569 return 0; 570} 571 572static int ioctl_deallocate(struct client *client, void *buffer) 573{ 574 struct fw_cdev_deallocate *request = buffer; 575 576 return release_client_resource(client, request->handle, NULL); 577} 578 579static int ioctl_send_response(struct client *client, void *buffer) 580{ 581 struct fw_cdev_send_response *request = buffer; 582 struct client_resource *resource; 583 struct request *r; 584 585 if (release_client_resource(client, request->handle, &resource) < 0) 586 return -EINVAL; 587 r = container_of(resource, struct request, resource); 588 if (request->length < r->length) 589 r->length = request->length; 590 if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) 591 return -EFAULT; 592 593 fw_send_response(client->device->card, r->request, request->rcode); 594 kfree(r); 595 596 return 0; 597} 598 599static int ioctl_initiate_bus_reset(struct client *client, void *buffer) 600{ 601 struct fw_cdev_initiate_bus_reset *request = buffer; 602 int short_reset; 603 604 short_reset = (request->type == FW_CDEV_SHORT_RESET); 605 606 return fw_core_initiate_bus_reset(client->device->card, short_reset); 607} 608 609struct descriptor { 610 struct fw_descriptor d; 611 struct client_resource resource; 612 u32 data[0]; 613}; 614 615static void release_descriptor(struct client *client, 616 struct client_resource *resource) 617{ 618 struct descriptor *descriptor = 619 container_of(resource, struct descriptor, resource); 620 621 fw_core_remove_descriptor(&descriptor->d); 622 kfree(descriptor); 623} 624 625static int ioctl_add_descriptor(struct client *client, void *buffer) 626{ 627 struct fw_cdev_add_descriptor *request = buffer; 628 struct descriptor *descriptor; 629 int retval; 630 631 if (request->length > 256) 632 return -EINVAL; 633 634 descriptor = 635 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL); 636 if (descriptor == NULL) 637 return -ENOMEM; 638 639 if (copy_from_user(descriptor->data, 640 u64_to_uptr(request->data), request->length * 4)) { 641 kfree(descriptor); 642 return -EFAULT; 643 } 644 645 descriptor->d.length = request->length; 646 descriptor->d.immediate = request->immediate; 647 descriptor->d.key = request->key; 648 descriptor->d.data = descriptor->data; 649 650 retval = fw_core_add_descriptor(&descriptor->d); 651 if (retval < 0) { 652 kfree(descriptor); 653 return retval; 654 } 655 656 descriptor->resource.release = release_descriptor; 657 add_client_resource(client, &descriptor->resource); 658 request->handle = descriptor->resource.handle; 659 660 return 0; 661} 662 663static int ioctl_remove_descriptor(struct client *client, void *buffer) 664{ 665 struct fw_cdev_remove_descriptor *request = buffer; 666 667 return release_client_resource(client, request->handle, NULL); 668} 669 670static void 671iso_callback(struct fw_iso_context *context, u32 cycle, 672 size_t header_length, void *header, void *data) 673{ 674 struct client *client = data; 675 struct iso_interrupt *irq; 676 677 irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC); 678 if (irq == NULL) 679 return; 680 681 irq->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; 682 irq->interrupt.closure = client->iso_closure; 683 irq->interrupt.cycle = cycle; 684 irq->interrupt.header_length = header_length; 685 memcpy(irq->interrupt.header, header, header_length); 686 queue_event(client, &irq->event, &irq->interrupt, 687 sizeof(irq->interrupt) + header_length, NULL, 0); 688} 689 690static int ioctl_create_iso_context(struct client *client, void *buffer) 691{ 692 struct fw_cdev_create_iso_context *request = buffer; 693 struct fw_iso_context *context; 694 695 /* We only support one context at this time. */ 696 if (client->iso_context != NULL) 697 return -EBUSY; 698 699 if (request->channel > 63) 700 return -EINVAL; 701 702 switch (request->type) { 703 case FW_ISO_CONTEXT_RECEIVE: 704 if (request->header_size < 4 || (request->header_size & 3)) 705 return -EINVAL; 706 707 break; 708 709 case FW_ISO_CONTEXT_TRANSMIT: 710 if (request->speed > SCODE_3200) 711 return -EINVAL; 712 713 break; 714 715 default: 716 return -EINVAL; 717 } 718 719 context = fw_iso_context_create(client->device->card, 720 request->type, 721 request->channel, 722 request->speed, 723 request->header_size, 724 iso_callback, client); 725 if (IS_ERR(context)) 726 return PTR_ERR(context); 727 728 client->iso_closure = request->closure; 729 client->iso_context = context; 730 731 /* We only support one context at this time. */ 732 request->handle = 0; 733 734 return 0; 735} 736 737/* Macros for decoding the iso packet control header. */ 738#define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) 739#define GET_INTERRUPT(v) (((v) >> 16) & 0x01) 740#define GET_SKIP(v) (((v) >> 17) & 0x01) 741#define GET_TAG(v) (((v) >> 18) & 0x03) 742#define GET_SY(v) (((v) >> 20) & 0x0f) 743#define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) 744 745static int ioctl_queue_iso(struct client *client, void *buffer) 746{ 747 struct fw_cdev_queue_iso *request = buffer; 748 struct fw_cdev_iso_packet __user *p, *end, *next; 749 struct fw_iso_context *ctx = client->iso_context; 750 unsigned long payload, buffer_end, header_length; 751 u32 control; 752 int count; 753 struct { 754 struct fw_iso_packet packet; 755 u8 header[256]; 756 } u; 757 758 if (ctx == NULL || request->handle != 0) 759 return -EINVAL; 760 761 /* 762 * If the user passes a non-NULL data pointer, has mmap()'ed 763 * the iso buffer, and the pointer points inside the buffer, 764 * we setup the payload pointers accordingly. Otherwise we 765 * set them both to 0, which will still let packets with 766 * payload_length == 0 through. In other words, if no packets 767 * use the indirect payload, the iso buffer need not be mapped 768 * and the request->data pointer is ignored. 769 */ 770 771 payload = (unsigned long)request->data - client->vm_start; 772 buffer_end = client->buffer.page_count << PAGE_SHIFT; 773 if (request->data == 0 || client->buffer.pages == NULL || 774 payload >= buffer_end) { 775 payload = 0; 776 buffer_end = 0; 777 } 778 779 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets); 780 781 if (!access_ok(VERIFY_READ, p, request->size)) 782 return -EFAULT; 783 784 end = (void __user *)p + request->size; 785 count = 0; 786 while (p < end) { 787 if (get_user(control, &p->control)) 788 return -EFAULT; 789 u.packet.payload_length = GET_PAYLOAD_LENGTH(control); 790 u.packet.interrupt = GET_INTERRUPT(control); 791 u.packet.skip = GET_SKIP(control); 792 u.packet.tag = GET_TAG(control); 793 u.packet.sy = GET_SY(control); 794 u.packet.header_length = GET_HEADER_LENGTH(control); 795 796 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) { 797 header_length = u.packet.header_length; 798 } else { 799 /* 800 * We require that header_length is a multiple of 801 * the fixed header size, ctx->header_size. 802 */ 803 if (ctx->header_size == 0) { 804 if (u.packet.header_length > 0) 805 return -EINVAL; 806 } else if (u.packet.header_length % ctx->header_size != 0) { 807 return -EINVAL; 808 } 809 header_length = 0; 810 } 811 812 next = (struct fw_cdev_iso_packet __user *) 813 &p->header[header_length / 4]; 814 if (next > end) 815 return -EINVAL; 816 if (__copy_from_user 817 (u.packet.header, p->header, header_length)) 818 return -EFAULT; 819 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && 820 u.packet.header_length + u.packet.payload_length > 0) 821 return -EINVAL; 822 if (payload + u.packet.payload_length > buffer_end) 823 return -EINVAL; 824 825 if (fw_iso_context_queue(ctx, &u.packet, 826 &client->buffer, payload)) 827 break; 828 829 p = next; 830 payload += u.packet.payload_length; 831 count++; 832 } 833 834 request->size -= uptr_to_u64(p) - request->packets; 835 request->packets = uptr_to_u64(p); 836 request->data = client->vm_start + payload; 837 838 return count; 839} 840 841static int ioctl_start_iso(struct client *client, void *buffer) 842{ 843 struct fw_cdev_start_iso *request = buffer; 844 845 if (client->iso_context == NULL || request->handle != 0) 846 return -EINVAL; 847 848 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) { 849 if (request->tags == 0 || request->tags > 15) 850 return -EINVAL; 851 852 if (request->sync > 15) 853 return -EINVAL; 854 } 855 856 return fw_iso_context_start(client->iso_context, request->cycle, 857 request->sync, request->tags); 858} 859 860static int ioctl_stop_iso(struct client *client, void *buffer) 861{ 862 struct fw_cdev_stop_iso *request = buffer; 863 864 if (client->iso_context == NULL || request->handle != 0) 865 return -EINVAL; 866 867 return fw_iso_context_stop(client->iso_context); 868} 869 870static int ioctl_get_cycle_timer(struct client *client, void *buffer) 871{ 872 struct fw_cdev_get_cycle_timer *request = buffer; 873 struct fw_card *card = client->device->card; 874 unsigned long long bus_time; 875 struct timeval tv; 876 unsigned long flags; 877 878 preempt_disable(); 879 local_irq_save(flags); 880 881 bus_time = card->driver->get_bus_time(card); 882 do_gettimeofday(&tv); 883 884 local_irq_restore(flags); 885 preempt_enable(); 886 887 request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec; 888 request->cycle_timer = bus_time & 0xffffffff; 889 return 0; 890} 891 892static int (* const ioctl_handlers[])(struct client *client, void *buffer) = { 893 ioctl_get_info, 894 ioctl_send_request, 895 ioctl_allocate, 896 ioctl_deallocate, 897 ioctl_send_response, 898 ioctl_initiate_bus_reset, 899 ioctl_add_descriptor, 900 ioctl_remove_descriptor, 901 ioctl_create_iso_context, 902 ioctl_queue_iso, 903 ioctl_start_iso, 904 ioctl_stop_iso, 905 ioctl_get_cycle_timer, 906}; 907 908static int 909dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) 910{ 911 char buffer[256]; 912 int retval; 913 914 if (_IOC_TYPE(cmd) != '#' || 915 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers)) 916 return -EINVAL; 917 918 if (_IOC_DIR(cmd) & _IOC_WRITE) { 919 if (_IOC_SIZE(cmd) > sizeof(buffer) || 920 copy_from_user(buffer, arg, _IOC_SIZE(cmd))) 921 return -EFAULT; 922 } 923 924 retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer); 925 if (retval < 0) 926 return retval; 927 928 if (_IOC_DIR(cmd) & _IOC_READ) { 929 if (_IOC_SIZE(cmd) > sizeof(buffer) || 930 copy_to_user(arg, buffer, _IOC_SIZE(cmd))) 931 return -EFAULT; 932 } 933 934 return retval; 935} 936 937static long 938fw_device_op_ioctl(struct file *file, 939 unsigned int cmd, unsigned long arg) 940{ 941 struct client *client = file->private_data; 942 943 if (fw_device_is_shutdown(client->device)) 944 return -ENODEV; 945 946 return dispatch_ioctl(client, cmd, (void __user *) arg); 947} 948 949#ifdef CONFIG_COMPAT 950static long 951fw_device_op_compat_ioctl(struct file *file, 952 unsigned int cmd, unsigned long arg) 953{ 954 struct client *client = file->private_data; 955 956 if (fw_device_is_shutdown(client->device)) 957 return -ENODEV; 958 959 return dispatch_ioctl(client, cmd, compat_ptr(arg)); 960} 961#endif 962 963static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) 964{ 965 struct client *client = file->private_data; 966 enum dma_data_direction direction; 967 unsigned long size; 968 int page_count, retval; 969 970 if (fw_device_is_shutdown(client->device)) 971 return -ENODEV; 972 973 /* FIXME: We could support multiple buffers, but we don't. */ 974 if (client->buffer.pages != NULL) 975 return -EBUSY; 976 977 if (!(vma->vm_flags & VM_SHARED)) 978 return -EINVAL; 979 980 if (vma->vm_start & ~PAGE_MASK) 981 return -EINVAL; 982 983 client->vm_start = vma->vm_start; 984 size = vma->vm_end - vma->vm_start; 985 page_count = size >> PAGE_SHIFT; 986 if (size & ~PAGE_MASK) 987 return -EINVAL; 988 989 if (vma->vm_flags & VM_WRITE) 990 direction = DMA_TO_DEVICE; 991 else 992 direction = DMA_FROM_DEVICE; 993 994 retval = fw_iso_buffer_init(&client->buffer, client->device->card, 995 page_count, direction); 996 if (retval < 0) 997 return retval; 998 999 retval = fw_iso_buffer_map(&client->buffer, vma); 1000 if (retval < 0) 1001 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1002 1003 return retval; 1004} 1005 1006static int fw_device_op_release(struct inode *inode, struct file *file) 1007{ 1008 struct client *client = file->private_data; 1009 struct event *e, *next_e; 1010 struct client_resource *r, *next_r; 1011 1012 if (client->buffer.pages) 1013 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1014 1015 if (client->iso_context) 1016 fw_iso_context_destroy(client->iso_context); 1017 1018 list_for_each_entry_safe(r, next_r, &client->resource_list, link) 1019 r->release(client, r); 1020 1021 /* 1022 * FIXME: We should wait for the async tasklets to stop 1023 * running before freeing the memory. 1024 */ 1025 1026 list_for_each_entry_safe(e, next_e, &client->event_list, link) 1027 kfree(e); 1028 1029 mutex_lock(&client->device->client_list_mutex); 1030 list_del(&client->link); 1031 mutex_unlock(&client->device->client_list_mutex); 1032 1033 fw_device_put(client->device); 1034 kfree(client); 1035 1036 return 0; 1037} 1038 1039static unsigned int fw_device_op_poll(struct file *file, poll_table * pt) 1040{ 1041 struct client *client = file->private_data; 1042 unsigned int mask = 0; 1043 1044 poll_wait(file, &client->wait, pt); 1045 1046 if (fw_device_is_shutdown(client->device)) 1047 mask |= POLLHUP | POLLERR; 1048 if (!list_empty(&client->event_list)) 1049 mask |= POLLIN | POLLRDNORM; 1050 1051 return mask; 1052} 1053 1054const struct file_operations fw_device_ops = { 1055 .owner = THIS_MODULE, 1056 .open = fw_device_op_open, 1057 .read = fw_device_op_read, 1058 .unlocked_ioctl = fw_device_op_ioctl, 1059 .poll = fw_device_op_poll, 1060 .release = fw_device_op_release, 1061 .mmap = fw_device_op_mmap, 1062 1063#ifdef CONFIG_COMPAT 1064 .compat_ioctl = fw_device_op_compat_ioctl, 1065#endif 1066}; 1067