SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/firewire/fw-cdev.c

   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
  43 struct client;
  44 struct client_resource;
  45 typedef void (*client_resource_release_fn_t)(struct client *,
  46                                              struct client_resource *);
  47 struct client_resource {
  48         client_resource_release_fn_t release;
  49         int handle;
  50 };
  51
  52 /*
  53  * dequeue_event() just kfree()'s the event, so the event has to be
  54  * the first field in the struct.
  55  */
  56
  57 struct event {
  58         struct { void *data; size_t size; } v[2];
  59         struct list_head link;
  60 };
  61
  62 struct bus_reset {
  63         struct event event;
  64         struct fw_cdev_event_bus_reset reset;
  65 };
  66
  67 struct response {
  68         struct event event;
  69         struct fw_transaction transaction;
  70         struct client *client;
  71         struct client_resource resource;
  72         struct fw_cdev_event_response response;
  73 };
  74
  75 struct iso_interrupt {
  76         struct event event;
  77         struct fw_cdev_event_iso_interrupt interrupt;
  78 };
  79
  80 struct client {
  81         u32 version;
  82         struct fw_device *device;
  83
  84         spinlock_t lock;
  85         bool in_shutdown;
  86         struct idr resource_idr;
  87         struct list_head event_list;
  88         wait_queue_head_t wait;
  89         u64 bus_reset_closure;
  90
  91         struct fw_iso_context *iso_context;
  92         u64 iso_closure;
  93         struct fw_iso_buffer buffer;
  94         unsigned long vm_start;
  95
  96         struct list_head link;
  97 };
  98
  99 static inline void __user *u64_to_uptr(__u64 value)
 100 {
 101         return (void __user *)(unsigned long)value;
 102 }
 103
 104 static inline __u64 uptr_to_u64(void __user *ptr)
 105 {
 106         return (__u64)(unsigned long)ptr;
 107 }
 108
 109 static int fw_device_op_open(struct inode *inode, struct file *file)
 110 {
 111         struct fw_device *device;
 112         struct client *client;
 113
 114         device = fw_device_get_by_devt(inode->i_rdev);
 115         if (device == NULL)
 116                 return -ENODEV;
 117
 118         if (fw_device_is_shutdown(device)) {
 119                 fw_device_put(device);
 120                 return -ENODEV;
 121         }
 122
 123         client = kzalloc(sizeof(*client), GFP_KERNEL);
 124         if (client == NULL) {
 125                 fw_device_put(device);
 126                 return -ENOMEM;
 127         }
 128
 129         client->device = device;
 130         spin_lock_init(&client->lock);
 131         idr_init(&client->resource_idr);
 132         INIT_LIST_HEAD(&client->event_list);
 133         init_waitqueue_head(&client->wait);
 134
 135         file->private_data = client;
 136
 137         mutex_lock(&device->client_list_mutex);
 138         list_add_tail(&client->link, &device->client_list);
 139         mutex_unlock(&device->client_list_mutex);
 140
 141         return 0;
 142 }
 143
 144 static void queue_event(struct client *client, struct event *event,
 145                         void *data0, size_t size0, void *data1, size_t size1)
 146 {
 147         unsigned long flags;
 148
 149         event->v[0].data = data0;
 150         event->v[0].size = size0;
 151         event->v[1].data = data1;
 152         event->v[1].size = size1;
 153
 154         spin_lock_irqsave(&client->lock, flags);
 155         if (client->in_shutdown)
 156                 kfree(event);
 157         else
 158                 list_add_tail(&event->link, &client->event_list);
 159         spin_unlock_irqrestore(&client->lock, flags);
 160
 161         wake_up_interruptible(&client->wait);
 162 }
 163
 164 static int dequeue_event(struct client *client,
 165                          char __user *buffer, size_t count)
 166 {
 167         unsigned long flags;
 168         struct event *event;
 169         size_t size, total;
 170         int i, ret;
 171
 172         ret = wait_event_interruptible(client->wait,
 173                         !list_empty(&client->event_list) ||
 174                         fw_device_is_shutdown(client->device));
 175         if (ret < 0)
 176                 return ret;
 177
 178         if (list_empty(&client->event_list) &&
 179                        fw_device_is_shutdown(client->device))
 180                 return -ENODEV;
 181
 182         spin_lock_irqsave(&client->lock, flags);
 183         event = container_of(client->event_list.next, struct event, link);
 184         list_del(&event->link);
 185         spin_unlock_irqrestore(&client->lock, flags);
 186
 187         total = 0;
 188         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 189                 size = min(event->v[i].size, count - total);
 190                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 191                         ret = -EFAULT;
 192                         goto out;
 193                 }
 194                 total += size;
 195         }
 196         ret = total;
 197
 198  out:
 199         kfree(event);
 200
 201         return ret;
 202 }
 203
 204 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 205                                  size_t count, loff_t *offset)
 206 {
 207         struct client *client = file->private_data;
 208
 209         return dequeue_event(client, buffer, count);
 210 }
 211
 212 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 213                                  struct client *client)
 214 {
 215         struct fw_card *card = client->device->card;
 216         unsigned long flags;
 217
 218         spin_lock_irqsave(&card->lock, flags);
 219
 220         event->closure       = client->bus_reset_closure;
 221         event->type          = FW_CDEV_EVENT_BUS_RESET;
 222         event->generation    = client->device->generation;
 223         event->node_id       = client->device->node_id;
 224         event->local_node_id = card->local_node->node_id;
 225         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 226         event->irm_node_id   = card->irm_node->node_id;
 227         event->root_node_id  = card->root_node->node_id;
 228
 229         spin_unlock_irqrestore(&card->lock, flags);
 230 }
 231
 232 static void for_each_client(struct fw_device *device,
 233                             void (*callback)(struct client *client))
 234 {
 235         struct client *c;
 236
 237         mutex_lock(&device->client_list_mutex);
 238         list_for_each_entry(c, &device->client_list, link)
 239                 callback(c);
 240         mutex_unlock(&device->client_list_mutex);
 241 }
 242
 243 static void queue_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
 259 void fw_device_cdev_update(struct fw_device *device)
 260 {
 261         for_each_client(device, queue_bus_reset_event);
 262 }
 263
 264 static void wake_up_client(struct client *client)
 265 {
 266         wake_up_interruptible(&client->wait);
 267 }
 268
 269 void fw_device_cdev_remove(struct fw_device *device)
 270 {
 271         for_each_client(device, wake_up_client);
 272 }
 273
 274 static 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
 313 static int add_client_resource(struct client *client,
 314                                struct client_resource *resource, gfp_t gfp_mask)
 315 {
 316         unsigned long flags;
 317         int ret;
 318
 319  retry:
 320         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 321                 return -ENOMEM;
 322
 323         spin_lock_irqsave(&client->lock, flags);
 324         if (client->in_shutdown)
 325                 ret = -ECANCELED;
 326         else
 327                 ret = idr_get_new(&client->resource_idr, resource,
 328                                   &resource->handle);
 329         spin_unlock_irqrestore(&client->lock, flags);
 330
 331         if (ret == -EAGAIN)
 332                 goto retry;
 333
 334         return ret < 0 ? ret : 0;
 335 }
 336
 337 static int release_client_resource(struct client *client, u32 handle,
 338                                    client_resource_release_fn_t release,
 339                                    struct client_resource **resource)
 340 {
 341         struct client_resource *r;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&client->lock, flags);
 345         if (client->in_shutdown)
 346                 r = NULL;
 347         else
 348                 r = idr_find(&client->resource_idr, handle);
 349         if (r && r->release == release)
 350                 idr_remove(&client->resource_idr, handle);
 351         spin_unlock_irqrestore(&client->lock, flags);
 352
 353         if (!(r && r->release == release))
 354                 return -EINVAL;
 355
 356         if (resource)
 357                 *resource = r;
 358         else
 359                 r->release(client, r);
 360
 361         return 0;
 362 }
 363
 364 static void release_transaction(struct client *client,
 365                                 struct client_resource *resource)
 366 {
 367         struct response *response =
 368                 container_of(resource, struct response, resource);
 369
 370         fw_cancel_transaction(client->device->card, &response->transaction);
 371 }
 372
 373 static void complete_transaction(struct fw_card *card, int rcode,
 374                                  void *payload, size_t length, void *data)
 375 {
 376         struct response *response = data;
 377         struct client *client = response->client;
 378         unsigned long flags;
 379         struct fw_cdev_event_response *r = &response->response;
 380
 381         if (length < r->length)
 382                 r->length = length;
 383         if (rcode == RCODE_COMPLETE)
 384                 memcpy(r->data, payload, r->length);
 385
 386         spin_lock_irqsave(&client->lock, flags);
 387         /*
 388          * If called while in shutdown, the idr tree must be left untouched.
 389          * The idr handle will be removed later.
 390          */
 391         if (!client->in_shutdown)
 392                 idr_remove(&client->resource_idr, response->resource.handle);
 393         spin_unlock_irqrestore(&client->lock, flags);
 394
 395         r->type   = FW_CDEV_EVENT_RESPONSE;
 396         r->rcode  = rcode;
 397
 398         /*
 399          * In the case that sizeof(*r) doesn't align with the position of the
 400          * data, and the read is short, preserve an extra copy of the data
 401          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 402          * for short reads and some apps depended on it, this is both safe
 403          * and prudent for compatibility.
 404          */
 405         if (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
 406                 queue_event(client, &response->event, r, sizeof(*r),
 407                             r->data, r->length);
 408         else
 409                 queue_event(client, &response->event, r, sizeof(*r) + r->length,
 410                             NULL, 0);
 411 }
 412
 413 static int ioctl_send_request(struct client *client, void *buffer)
 414 {
 415         struct fw_device *device = client->device;
 416         struct fw_cdev_send_request *request = buffer;
 417         struct response *response;
 418         int ret;
 419
 420         /* What is the biggest size we'll accept, really? */
 421         if (request->length > 4096)
 422                 return -EINVAL;
 423
 424         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
 425         if (response == NULL)
 426                 return -ENOMEM;
 427
 428         response->client = client;
 429         response->response.length = request->length;
 430         response->response.closure = request->closure;
 431
 432         if (request->data &&
 433             copy_from_user(response->response.data,
 434                            u64_to_uptr(request->data), request->length)) {
 435                 ret = -EFAULT;
 436                 goto failed;
 437         }
 438
 439         switch (request->tcode) {
 440         case TCODE_WRITE_QUADLET_REQUEST:
 441         case TCODE_WRITE_BLOCK_REQUEST:
 442         case TCODE_READ_QUADLET_REQUEST:
 443         case TCODE_READ_BLOCK_REQUEST:
 444         case TCODE_LOCK_MASK_SWAP:
 445         case TCODE_LOCK_COMPARE_SWAP:
 446         case TCODE_LOCK_FETCH_ADD:
 447         case TCODE_LOCK_LITTLE_ADD:
 448         case TCODE_LOCK_BOUNDED_ADD:
 449         case TCODE_LOCK_WRAP_ADD:
 450         case TCODE_LOCK_VENDOR_DEPENDENT:
 451                 break;
 452         default:
 453                 ret = -EINVAL;
 454                 goto failed;
 455         }
 456
 457         response->resource.release = release_transaction;
 458         ret = add_client_resource(client, &response->resource, GFP_KERNEL);
 459         if (ret < 0)
 460                 goto failed;
 461
 462         fw_send_request(device->card, &response->transaction,
 463                         request->tcode & 0x1f,
 464                         device->node->node_id,
 465                         request->generation,
 466                         device->max_speed,
 467                         request->offset,
 468                         response->response.data, request->length,
 469                         complete_transaction, response);
 470
 471         if (request->data)
 472                 return sizeof(request) + request->length;
 473         else
 474                 return sizeof(request);
 475  failed:
 476         kfree(response);
 477
 478         return ret;
 479 }
 480
 481 struct address_handler {
 482         struct fw_address_handler handler;
 483         __u64 closure;
 484         struct client *client;
 485         struct client_resource resource;
 486 };
 487
 488 struct request {
 489         struct fw_request *request;
 490         void *data;
 491         size_t length;
 492         struct client_resource resource;
 493 };
 494
 495 struct request_event {
 496         struct event event;
 497         struct fw_cdev_event_request request;
 498 };
 499
 500 static void release_request(struct client *client,
 501                             struct client_resource *resource)
 502 {
 503         struct request *request =
 504                 container_of(resource, struct request, resource);
 505
 506         fw_send_response(client->device->card, request->request,
 507                          RCODE_CONFLICT_ERROR);
 508         kfree(request);
 509 }
 510
 511 static void handle_request(struct fw_card *card, struct fw_request *r,
 512                            int tcode, int destination, int source,
 513                            int generation, int speed,
 514                            unsigned long long offset,
 515                            void *payload, size_t length, void *callback_data)
 516 {
 517         struct address_handler *handler = callback_data;
 518         struct request *request;
 519         struct request_event *e;
 520         struct client *client = handler->client;
 521         int ret;
 522
 523         request = kmalloc(sizeof(*request), GFP_ATOMIC);
 524         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 525         if (request == NULL || e == NULL)
 526                 goto failed;
 527
 528         request->request = r;
 529         request->data    = payload;
 530         request->length  = length;
 531
 532         request->resource.release = release_request;
 533         ret = add_client_resource(client, &request->resource, GFP_ATOMIC);
 534         if (ret < 0)
 535                 goto failed;
 536
 537         e->request.type    = FW_CDEV_EVENT_REQUEST;
 538         e->request.tcode   = tcode;
 539         e->request.offset  = offset;
 540         e->request.length  = length;
 541         e->request.handle  = request->resource.handle;
 542         e->request.closure = handler->closure;
 543
 544         queue_event(client, &e->event,
 545                     &e->request, sizeof(e->request), payload, length);
 546         return;
 547
 548  failed:
 549         kfree(request);
 550         kfree(e);
 551         fw_send_response(card, r, RCODE_CONFLICT_ERROR);
 552 }
 553
 554 static void release_address_handler(struct client *client,
 555                                     struct client_resource *resource)
 556 {
 557         struct address_handler *handler =
 558                 container_of(resource, struct address_handler, resource);
 559
 560         fw_core_remove_address_handler(&handler->handler);
 561         kfree(handler);
 562 }
 563
 564 static int ioctl_allocate(struct client *client, void *buffer)
 565 {
 566         struct fw_cdev_allocate *request = buffer;
 567         struct address_handler *handler;
 568         struct fw_address_region region;
 569         int ret;
 570
 571         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
 572         if (handler == NULL)
 573                 return -ENOMEM;
 574
 575         region.start = request->offset;
 576         region.end = request->offset + request->length;
 577         handler->handler.length = request->length;
 578         handler->handler.address_callback = handle_request;
 579         handler->handler.callback_data = handler;
 580         handler->closure = request->closure;
 581         handler->client = client;
 582
 583         ret = fw_core_add_address_handler(&handler->handler, &region);
 584         if (ret < 0) {
 585                 kfree(handler);
 586                 return ret;
 587         }
 588
 589         handler->resource.release = release_address_handler;
 590         ret = add_client_resource(client, &handler->resource, GFP_KERNEL);
 591         if (ret < 0) {
 592                 release_address_handler(client, &handler->resource);
 593                 return ret;
 594         }
 595         request->handle = handler->resource.handle;
 596
 597         return 0;
 598 }
 599
 600 static int ioctl_deallocate(struct client *client, void *buffer)
 601 {
 602         struct fw_cdev_deallocate *request = buffer;
 603
 604         return release_client_resource(client, request->handle,
 605                                        release_address_handler, NULL);
 606 }
 607
 608 static int ioctl_send_response(struct client *client, void *buffer)
 609 {
 610         struct fw_cdev_send_response *request = buffer;
 611         struct client_resource *resource;
 612         struct request *r;
 613
 614         if (release_client_resource(client, request->handle,
 615                                     release_request, &resource) < 0)
 616                 return -EINVAL;
 617
 618         r = container_of(resource, struct request, resource);
 619         if (request->length < r->length)
 620                 r->length = request->length;
 621         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 622                 return -EFAULT;
 623
 624         fw_send_response(client->device->card, r->request, request->rcode);
 625         kfree(r);
 626
 627         return 0;
 628 }
 629
 630 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 631 {
 632         struct fw_cdev_initiate_bus_reset *request = buffer;
 633         int short_reset;
 634
 635         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 636
 637         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 638 }
 639
 640 struct descriptor {
 641         struct fw_descriptor d;
 642         struct client_resource resource;
 643         u32 data[0];
 644 };
 645
 646 static void release_descriptor(struct client *client,
 647                                struct client_resource *resource)
 648 {
 649         struct descriptor *descriptor =
 650                 container_of(resource, struct descriptor, resource);
 651
 652         fw_core_remove_descriptor(&descriptor->d);
 653         kfree(descriptor);
 654 }
 655
 656 static int ioctl_add_descriptor(struct client *client, void *buffer)
 657 {
 658         struct fw_cdev_add_descriptor *request = buffer;
 659         struct descriptor *descriptor;
 660         int ret;
 661
 662         if (request->length > 256)
 663                 return -EINVAL;
 664
 665         descriptor =
 666                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
 667         if (descriptor == NULL)
 668                 return -ENOMEM;
 669
 670         if (copy_from_user(descriptor->data,
 671                            u64_to_uptr(request->data), request->length * 4)) {
 672                 ret = -EFAULT;
 673                 goto failed;
 674         }
 675
 676         descriptor->d.length = request->length;
 677         descriptor->d.immediate = request->immediate;
 678         descriptor->d.key = request->key;
 679         descriptor->d.data = descriptor->data;
 680
 681         ret = fw_core_add_descriptor(&descriptor->d);
 682         if (ret < 0)
 683                 goto failed;
 684
 685         descriptor->resource.release = release_descriptor;
 686         ret = add_client_resource(client, &descriptor->resource, GFP_KERNEL);
 687         if (ret < 0) {
 688                 fw_core_remove_descriptor(&descriptor->d);
 689                 goto failed;
 690         }
 691         request->handle = descriptor->resource.handle;
 692
 693         return 0;
 694  failed:
 695         kfree(descriptor);
 696
 697         return ret;
 698 }
 699
 700 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 701 {
 702         struct fw_cdev_remove_descriptor *request = buffer;
 703
 704         return release_client_resource(client, request->handle,
 705                                        release_descriptor, NULL);
 706 }
 707
 708 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 709                          size_t header_length, void *header, void *data)
 710 {
 711         struct client *client = data;
 712         struct iso_interrupt *irq;
 713
 714         irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
 715         if (irq == NULL)
 716                 return;
 717
 718         irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 719         irq->interrupt.closure   = client->iso_closure;
 720         irq->interrupt.cycle     = cycle;
 721         irq->interrupt.header_length = header_length;
 722         memcpy(irq->interrupt.header, header, header_length);
 723         queue_event(client, &irq->event, &irq->interrupt,
 724                     sizeof(irq->interrupt) + header_length, NULL, 0);
 725 }
 726
 727 static int ioctl_create_iso_context(struct client *client, void *buffer)
 728 {
 729         struct fw_cdev_create_iso_context *request = buffer;
 730         struct fw_iso_context *context;
 731
 732         /* We only support one context at this time. */
 733         if (client->iso_context != NULL)
 734                 return -EBUSY;
 735
 736         if (request->channel > 63)
 737                 return -EINVAL;
 738
 739         switch (request->type) {
 740         case FW_ISO_CONTEXT_RECEIVE:
 741                 if (request->header_size < 4 || (request->header_size & 3))
 742                         return -EINVAL;
 743
 744                 break;
 745
 746         case FW_ISO_CONTEXT_TRANSMIT:
 747                 if (request->speed > SCODE_3200)
 748                         return -EINVAL;
 749
 750                 break;
 751
 752         default:
 753                 return -EINVAL;
 754         }
 755
 756         context =  fw_iso_context_create(client->device->card,
 757                                          request->type,
 758                                          request->channel,
 759                                          request->speed,
 760                                          request->header_size,
 761                                          iso_callback, client);
 762         if (IS_ERR(context))
 763                 return PTR_ERR(context);
 764
 765         client->iso_closure = request->closure;
 766         client->iso_context = context;
 767
 768         /* We only support one context at this time. */
 769         request->handle = 0;
 770
 771         return 0;
 772 }
 773
 774 /* Macros for decoding the iso packet control header. */
 775 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 776 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 777 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 778 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 779 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 780 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 781
 782 static int ioctl_queue_iso(struct client *client, void *buffer)
 783 {
 784         struct fw_cdev_queue_iso *request = buffer;
 785         struct fw_cdev_iso_packet __user *p, *end, *next;
 786         struct fw_iso_context *ctx = client->iso_context;
 787         unsigned long payload, buffer_end, header_length;
 788         u32 control;
 789         int count;
 790         struct {
 791                 struct fw_iso_packet packet;
 792                 u8 header[256];
 793         } u;
 794
 795         if (ctx == NULL || request->handle != 0)
 796                 return -EINVAL;
 797
 798         /*
 799          * If the user passes a non-NULL data pointer, has mmap()'ed
 800          * the iso buffer, and the pointer points inside the buffer,
 801          * we setup the payload pointers accordingly.  Otherwise we
 802          * set them both to 0, which will still let packets with
 803          * payload_length == 0 through.  In other words, if no packets
 804          * use the indirect payload, the iso buffer need not be mapped
 805          * and the request->data pointer is ignored.
 806          */
 807
 808         payload = (unsigned long)request->data - client->vm_start;
 809         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 810         if (request->data == 0 || client->buffer.pages == NULL ||
 811             payload >= buffer_end) {
 812                 payload = 0;
 813                 buffer_end = 0;
 814         }
 815
 816         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 817
 818         if (!access_ok(VERIFY_READ, p, request->size))
 819                 return -EFAULT;
 820
 821         end = (void __user *)p + request->size;
 822         count = 0;
 823         while (p < end) {
 824                 if (get_user(control, &p->control))
 825                         return -EFAULT;
 826                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 827                 u.packet.interrupt = GET_INTERRUPT(control);
 828                 u.packet.skip = GET_SKIP(control);
 829                 u.packet.tag = GET_TAG(control);
 830                 u.packet.sy = GET_SY(control);
 831                 u.packet.header_length = GET_HEADER_LENGTH(control);
 832
 833                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 834                         header_length = u.packet.header_length;
 835                 } else {
 836                         /*
 837                          * We require that header_length is a multiple of
 838                          * the fixed header size, ctx->header_size.
 839                          */
 840                         if (ctx->header_size == 0) {
 841                                 if (u.packet.header_length > 0)
 842                                         return -EINVAL;
 843                         } else if (u.packet.header_length % ctx->header_size != 0) {
 844                                 return -EINVAL;
 845                         }
 846                         header_length = 0;
 847                 }
 848
 849                 next = (struct fw_cdev_iso_packet __user *)
 850                         &p->header[header_length / 4];
 851                 if (next > end)
 852                         return -EINVAL;
 853                 if (__copy_from_user
 854                     (u.packet.header, p->header, header_length))
 855                         return -EFAULT;
 856                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 857                     u.packet.header_length + u.packet.payload_length > 0)
 858                         return -EINVAL;
 859                 if (payload + u.packet.payload_length > buffer_end)
 860                         return -EINVAL;
 861
 862                 if (fw_iso_context_queue(ctx, &u.packet,
 863                                          &client->buffer, payload))
 864                         break;
 865
 866                 p = next;
 867                 payload += u.packet.payload_length;
 868                 count++;
 869         }
 870
 871         request->size    -= uptr_to_u64(p) - request->packets;
 872         request->packets  = uptr_to_u64(p);
 873         request->data     = client->vm_start + payload;
 874
 875         return count;
 876 }
 877
 878 static int ioctl_start_iso(struct client *client, void *buffer)
 879 {
 880         struct fw_cdev_start_iso *request = buffer;
 881
 882         if (client->iso_context == NULL || request->handle != 0)
 883                 return -EINVAL;
 884
 885         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 886                 if (request->tags == 0 || request->tags > 15)
 887                         return -EINVAL;
 888
 889                 if (request->sync > 15)
 890                         return -EINVAL;
 891         }
 892
 893         return fw_iso_context_start(client->iso_context, request->cycle,
 894                                     request->sync, request->tags);
 895 }
 896
 897 static int ioctl_stop_iso(struct client *client, void *buffer)
 898 {
 899         struct fw_cdev_stop_iso *request = buffer;
 900
 901         if (client->iso_context == NULL || request->handle != 0)
 902                 return -EINVAL;
 903
 904         return fw_iso_context_stop(client->iso_context);
 905 }
 906
 907 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 908 {
 909         struct fw_cdev_get_cycle_timer *request = buffer;
 910         struct fw_card *card = client->device->card;
 911         unsigned long long bus_time;
 912         struct timeval tv;
 913         unsigned long flags;
 914
 915         preempt_disable();
 916         local_irq_save(flags);
 917
 918         bus_time = card->driver->get_bus_time(card);
 919         do_gettimeofday(&tv);
 920
 921         local_irq_restore(flags);
 922         preempt_enable();
 923
 924         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
 925         request->cycle_timer = bus_time & 0xffffffff;
 926         return 0;
 927 }
 928
 929 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
 930         ioctl_get_info,
 931         ioctl_send_request,
 932         ioctl_allocate,
 933         ioctl_deallocate,
 934         ioctl_send_response,
 935         ioctl_initiate_bus_reset,
 936         ioctl_add_descriptor,
 937         ioctl_remove_descriptor,
 938         ioctl_create_iso_context,
 939         ioctl_queue_iso,
 940         ioctl_start_iso,
 941         ioctl_stop_iso,
 942         ioctl_get_cycle_timer,
 943 };
 944
 945 static int dispatch_ioctl(struct client *client,
 946                           unsigned int cmd, void __user *arg)
 947 {
 948         char buffer[256];
 949         int ret;
 950
 951         if (_IOC_TYPE(cmd) != '#' ||
 952             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
 953                 return -EINVAL;
 954
 955         if (_IOC_DIR(cmd) & _IOC_WRITE) {
 956                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 957                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
 958                         return -EFAULT;
 959         }
 960
 961         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
 962         if (ret < 0)
 963                 return ret;
 964
 965         if (_IOC_DIR(cmd) & _IOC_READ) {
 966                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 967                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
 968                         return -EFAULT;
 969         }
 970
 971         return ret;
 972 }
 973
 974 static long fw_device_op_ioctl(struct file *file,
 975                                unsigned int cmd, unsigned long arg)
 976 {
 977         struct client *client = file->private_data;
 978
 979         if (fw_device_is_shutdown(client->device))
 980                 return -ENODEV;
 981
 982         return dispatch_ioctl(client, cmd, (void __user *) arg);
 983 }
 984
 985 #ifdef CONFIG_COMPAT
 986 static long fw_device_op_compat_ioctl(struct file *file,
 987                                       unsigned int cmd, unsigned long arg)
 988 {
 989         struct client *client = file->private_data;
 990
 991         if (fw_device_is_shutdown(client->device))
 992                 return -ENODEV;
 993
 994         return dispatch_ioctl(client, cmd, compat_ptr(arg));
 995 }
 996 #endif
 997
 998 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 999 {
1000         struct client *client = file->private_data;
1001         enum dma_data_direction direction;
1002         unsigned long size;
1003         int page_count, ret;
1004
1005         if (fw_device_is_shutdown(client->device))
1006                 return -ENODEV;
1007
1008         /* FIXME: We could support multiple buffers, but we don't. */
1009         if (client->buffer.pages != NULL)
1010                 return -EBUSY;
1011
1012         if (!(vma->vm_flags & VM_SHARED))
1013                 return -EINVAL;
1014
1015         if (vma->vm_start & ~PAGE_MASK)
1016                 return -EINVAL;
1017
1018         client->vm_start = vma->vm_start;
1019         size = vma->vm_end - vma->vm_start;
1020         page_count = size >> PAGE_SHIFT;
1021         if (size & ~PAGE_MASK)
1022                 return -EINVAL;
1023
1024         if (vma->vm_flags & VM_WRITE)
1025                 direction = DMA_TO_DEVICE;
1026         else
1027                 direction = DMA_FROM_DEVICE;
1028
1029         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1030                                  page_count, direction);
1031         if (ret < 0)
1032                 return ret;
1033
1034         ret = fw_iso_buffer_map(&client->buffer, vma);
1035         if (ret < 0)
1036                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1037
1038         return ret;
1039 }
1040
1041 static int shutdown_resource(int id, void *p, void *data)
1042 {
1043         struct client_resource *r = p;
1044         struct client *client = data;
1045
1046         r->release(client, r);
1047
1048         return 0;
1049 }
1050
1051 static int fw_device_op_release(struct inode *inode, struct file *file)
1052 {
1053         struct client *client = file->private_data;
1054         struct event *e, *next_e;
1055         unsigned long flags;
1056
1057         mutex_lock(&client->device->client_list_mutex);
1058         list_del(&client->link);
1059         mutex_unlock(&client->device->client_list_mutex);
1060
1061         if (client->buffer.pages)
1062                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1063
1064         if (client->iso_context)
1065                 fw_iso_context_destroy(client->iso_context);
1066
1067         /* Freeze client->resource_idr and client->event_list */
1068         spin_lock_irqsave(&client->lock, flags);
1069         client->in_shutdown = true;
1070         spin_unlock_irqrestore(&client->lock, flags);
1071
1072         idr_for_each(&client->resource_idr, shutdown_resource, client);
1073         idr_remove_all(&client->resource_idr);
1074         idr_destroy(&client->resource_idr);
1075
1076         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1077                 kfree(e);
1078
1079         /*
1080          * FIXME: client should be reference-counted.  It's extremely unlikely
1081          * but there may still be transactions being completed at this point.
1082          */
1083         fw_device_put(client->device);
1084         kfree(client);
1085
1086         return 0;
1087 }
1088
1089 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1090 {
1091         struct client *client = file->private_data;
1092         unsigned int mask = 0;
1093
1094         poll_wait(file, &client->wait, pt);
1095
1096         if (fw_device_is_shutdown(client->device))
1097                 mask |= POLLHUP | POLLERR;
1098         if (!list_empty(&client->event_list))
1099                 mask |= POLLIN | POLLRDNORM;
1100
1101         return mask;
1102 }
1103
1104 const struct file_operations fw_device_ops = {
1105         .owner          = THIS_MODULE,
1106         .open           = fw_device_op_open,
1107         .read           = fw_device_op_read,
1108         .unlocked_ioctl = fw_device_op_ioctl,
1109         .poll           = fw_device_op_poll,
1110         .release        = fw_device_op_release,
1111         .mmap           = fw_device_op_mmap,
1112
1113 #ifdef CONFIG_COMPAT
1114         .compat_ioctl   = fw_device_op_compat_ioctl,
1115 #endif
1116 };