drivers/firewire/core-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/compat.h>
  22 #include <linux/delay.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/firewire.h>
  26 #include <linux/firewire-cdev.h>
  27 #include <linux/idr.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/kernel.h>
  30 #include <linux/kref.h>
  31 #include <linux/mm.h>
  32 #include <linux/module.h>
  33 #include <linux/mutex.h>
  34 #include <linux/poll.h>
  35 #include <linux/preempt.h>
  36 #include <linux/sched.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/string.h>
  39 #include <linux/time.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/wait.h>
  43 #include <linux/workqueue.h>
  44
  45 #include <asm/system.h>
  46
  47 #include "core.h"
  48
  49 struct client {
  50         u32 version;
  51         struct fw_device *device;
  52
  53         spinlock_t lock;
  54         bool in_shutdown;
  55         struct idr resource_idr;
  56         struct list_head event_list;
  57         wait_queue_head_t wait;
  58         u64 bus_reset_closure;
  59
  60         struct fw_iso_context *iso_context;
  61         u64 iso_closure;
  62         struct fw_iso_buffer buffer;
  63         unsigned long vm_start;
  64
  65         struct list_head link;
  66         struct kref kref;
  67 };
  68
  69 static inline void client_get(struct client *client)
  70 {
  71         kref_get(&client->kref);
  72 }
  73
  74 static void client_release(struct kref *kref)
  75 {
  76         struct client *client = container_of(kref, struct client, kref);
  77
  78         fw_device_put(client->device);
  79         kfree(client);
  80 }
  81
  82 static void client_put(struct client *client)
  83 {
  84         kref_put(&client->kref, client_release);
  85 }
  86
  87 struct client_resource;
  88 typedef void (*client_resource_release_fn_t)(struct client *,
  89                                              struct client_resource *);
  90 struct client_resource {
  91         client_resource_release_fn_t release;
  92         int handle;
  93 };
  94
  95 struct address_handler_resource {
  96         struct client_resource resource;
  97         struct fw_address_handler handler;
  98         __u64 closure;
  99         struct client *client;
 100 };
 101
 102 struct outbound_transaction_resource {
 103         struct client_resource resource;
 104         struct fw_transaction transaction;
 105 };
 106
 107 struct inbound_transaction_resource {
 108         struct client_resource resource;
 109         struct fw_request *request;
 110         void *data;
 111         size_t length;
 112 };
 113
 114 struct descriptor_resource {
 115         struct client_resource resource;
 116         struct fw_descriptor descriptor;
 117         u32 data[0];
 118 };
 119
 120 struct iso_resource {
 121         struct client_resource resource;
 122         struct client *client;
 123         /* Schedule work and access todo only with client->lock held. */
 124         struct delayed_work work;
 125         enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
 126               ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
 127         int generation;
 128         u64 channels;
 129         s32 bandwidth;
 130         __be32 transaction_data[2];
 131         struct iso_resource_event *e_alloc, *e_dealloc;
 132 };
 133
 134 static void release_iso_resource(struct client *, struct client_resource *);
 135
 136 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
 137 {
 138         client_get(r->client);
 139         if (!schedule_delayed_work(&r->work, delay))
 140                 client_put(r->client);
 141 }
 142
 143 static void schedule_if_iso_resource(struct client_resource *resource)
 144 {
 145         if (resource->release == release_iso_resource)
 146                 schedule_iso_resource(container_of(resource,
 147                                         struct iso_resource, resource), 0);
 148 }
 149
 150 /*
 151  * dequeue_event() just kfree()'s the event, so the event has to be
 152  * the first field in a struct XYZ_event.
 153  */
 154 struct event {
 155         struct { void *data; size_t size; } v[2];
 156         struct list_head link;
 157 };
 158
 159 struct bus_reset_event {
 160         struct event event;
 161         struct fw_cdev_event_bus_reset reset;
 162 };
 163
 164 struct outbound_transaction_event {
 165         struct event event;
 166         struct client *client;
 167         struct outbound_transaction_resource r;
 168         struct fw_cdev_event_response response;
 169 };
 170
 171 struct inbound_transaction_event {
 172         struct event event;
 173         struct fw_cdev_event_request request;
 174 };
 175
 176 struct iso_interrupt_event {
 177         struct event event;
 178         struct fw_cdev_event_iso_interrupt interrupt;
 179 };
 180
 181 struct iso_resource_event {
 182         struct event event;
 183         struct fw_cdev_event_iso_resource iso_resource;
 184 };
 185
 186 static inline void __user *u64_to_uptr(__u64 value)
 187 {
 188         return (void __user *)(unsigned long)value;
 189 }
 190
 191 static inline __u64 uptr_to_u64(void __user *ptr)
 192 {
 193         return (__u64)(unsigned long)ptr;
 194 }
 195
 196 static int fw_device_op_open(struct inode *inode, struct file *file)
 197 {
 198         struct fw_device *device;
 199         struct client *client;
 200
 201         device = fw_device_get_by_devt(inode->i_rdev);
 202         if (device == NULL)
 203                 return -ENODEV;
 204
 205         if (fw_device_is_shutdown(device)) {
 206                 fw_device_put(device);
 207                 return -ENODEV;
 208         }
 209
 210         client = kzalloc(sizeof(*client), GFP_KERNEL);
 211         if (client == NULL) {
 212                 fw_device_put(device);
 213                 return -ENOMEM;
 214         }
 215
 216         client->device = device;
 217         spin_lock_init(&client->lock);
 218         idr_init(&client->resource_idr);
 219         INIT_LIST_HEAD(&client->event_list);
 220         init_waitqueue_head(&client->wait);
 221         kref_init(&client->kref);
 222
 223         file->private_data = client;
 224
 225         mutex_lock(&device->client_list_mutex);
 226         list_add_tail(&client->link, &device->client_list);
 227         mutex_unlock(&device->client_list_mutex);
 228
 229         return 0;
 230 }
 231
 232 static void queue_event(struct client *client, struct event *event,
 233                         void *data0, size_t size0, void *data1, size_t size1)
 234 {
 235         unsigned long flags;
 236
 237         event->v[0].data = data0;
 238         event->v[0].size = size0;
 239         event->v[1].data = data1;
 240         event->v[1].size = size1;
 241
 242         spin_lock_irqsave(&client->lock, flags);
 243         if (client->in_shutdown)
 244                 kfree(event);
 245         else
 246                 list_add_tail(&event->link, &client->event_list);
 247         spin_unlock_irqrestore(&client->lock, flags);
 248
 249         wake_up_interruptible(&client->wait);
 250 }
 251
 252 static int dequeue_event(struct client *client,
 253                          char __user *buffer, size_t count)
 254 {
 255         struct event *event;
 256         size_t size, total;
 257         int i, ret;
 258
 259         ret = wait_event_interruptible(client->wait,
 260                         !list_empty(&client->event_list) ||
 261                         fw_device_is_shutdown(client->device));
 262         if (ret < 0)
 263                 return ret;
 264
 265         if (list_empty(&client->event_list) &&
 266                        fw_device_is_shutdown(client->device))
 267                 return -ENODEV;
 268
 269         spin_lock_irq(&client->lock);
 270         event = list_first_entry(&client->event_list, struct event, link);
 271         list_del(&event->link);
 272         spin_unlock_irq(&client->lock);
 273
 274         total = 0;
 275         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 276                 size = min(event->v[i].size, count - total);
 277                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 278                         ret = -EFAULT;
 279                         goto out;
 280                 }
 281                 total += size;
 282         }
 283         ret = total;
 284
 285  out:
 286         kfree(event);
 287
 288         return ret;
 289 }
 290
 291 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 292                                  size_t count, loff_t *offset)
 293 {
 294         struct client *client = file->private_data;
 295
 296         return dequeue_event(client, buffer, count);
 297 }
 298
 299 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 300                                  struct client *client)
 301 {
 302         struct fw_card *card = client->device->card;
 303
 304         spin_lock_irq(&card->lock);
 305
 306         event->closure       = client->bus_reset_closure;
 307         event->type          = FW_CDEV_EVENT_BUS_RESET;
 308         event->generation    = client->device->generation;
 309         event->node_id       = client->device->node_id;
 310         event->local_node_id = card->local_node->node_id;
 311         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 312         event->irm_node_id   = card->irm_node->node_id;
 313         event->root_node_id  = card->root_node->node_id;
 314
 315         spin_unlock_irq(&card->lock);
 316 }
 317
 318 static void for_each_client(struct fw_device *device,
 319                             void (*callback)(struct client *client))
 320 {
 321         struct client *c;
 322
 323         mutex_lock(&device->client_list_mutex);
 324         list_for_each_entry(c, &device->client_list, link)
 325                 callback(c);
 326         mutex_unlock(&device->client_list_mutex);
 327 }
 328
 329 static int schedule_reallocations(int id, void *p, void *data)
 330 {
 331         schedule_if_iso_resource(p);
 332
 333         return 0;
 334 }
 335
 336 static void queue_bus_reset_event(struct client *client)
 337 {
 338         struct bus_reset_event *e;
 339
 340         e = kzalloc(sizeof(*e), GFP_KERNEL);
 341         if (e == NULL) {
 342                 fw_notify("Out of memory when allocating bus reset event\n");
 343                 return;
 344         }
 345
 346         fill_bus_reset_event(&e->reset, client);
 347
 348         queue_event(client, &e->event,
 349                     &e->reset, sizeof(e->reset), NULL, 0);
 350
 351         spin_lock_irq(&client->lock);
 352         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 353         spin_unlock_irq(&client->lock);
 354 }
 355
 356 void fw_device_cdev_update(struct fw_device *device)
 357 {
 358         for_each_client(device, queue_bus_reset_event);
 359 }
 360
 361 static void wake_up_client(struct client *client)
 362 {
 363         wake_up_interruptible(&client->wait);
 364 }
 365
 366 void fw_device_cdev_remove(struct fw_device *device)
 367 {
 368         for_each_client(device, wake_up_client);
 369 }
 370
 371 static int ioctl_get_info(struct client *client, void *buffer)
 372 {
 373         struct fw_cdev_get_info *get_info = buffer;
 374         struct fw_cdev_event_bus_reset bus_reset;
 375         unsigned long ret = 0;
 376
 377         client->version = get_info->version;
 378         get_info->version = FW_CDEV_VERSION;
 379         get_info->card = client->device->card->index;
 380
 381         down_read(&fw_device_rwsem);
 382
 383         if (get_info->rom != 0) {
 384                 void __user *uptr = u64_to_uptr(get_info->rom);
 385                 size_t want = get_info->rom_length;
 386                 size_t have = client->device->config_rom_length * 4;
 387
 388                 ret = copy_to_user(uptr, client->device->config_rom,
 389                                    min(want, have));
 390         }
 391         get_info->rom_length = client->device->config_rom_length * 4;
 392
 393         up_read(&fw_device_rwsem);
 394
 395         if (ret != 0)
 396                 return -EFAULT;
 397
 398         client->bus_reset_closure = get_info->bus_reset_closure;
 399         if (get_info->bus_reset != 0) {
 400                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 401
 402                 fill_bus_reset_event(&bus_reset, client);
 403                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 404                         return -EFAULT;
 405         }
 406
 407         return 0;
 408 }
 409
 410 static int add_client_resource(struct client *client,
 411                                struct client_resource *resource, gfp_t gfp_mask)
 412 {
 413         unsigned long flags;
 414         int ret;
 415
 416  retry:
 417         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 418                 return -ENOMEM;
 419
 420         spin_lock_irqsave(&client->lock, flags);
 421         if (client->in_shutdown)
 422                 ret = -ECANCELED;
 423         else
 424                 ret = idr_get_new(&client->resource_idr, resource,
 425                                   &resource->handle);
 426         if (ret >= 0) {
 427                 client_get(client);
 428                 schedule_if_iso_resource(resource);
 429         }
 430         spin_unlock_irqrestore(&client->lock, flags);
 431
 432         if (ret == -EAGAIN)
 433                 goto retry;
 434
 435         return ret < 0 ? ret : 0;
 436 }
 437
 438 static int release_client_resource(struct client *client, u32 handle,
 439                                    client_resource_release_fn_t release,
 440                                    struct client_resource **return_resource)
 441 {
 442         struct client_resource *resource;
 443
 444         spin_lock_irq(&client->lock);
 445         if (client->in_shutdown)
 446                 resource = NULL;
 447         else
 448                 resource = idr_find(&client->resource_idr, handle);
 449         if (resource && resource->release == release)
 450                 idr_remove(&client->resource_idr, handle);
 451         spin_unlock_irq(&client->lock);
 452
 453         if (!(resource && resource->release == release))
 454                 return -EINVAL;
 455
 456         if (return_resource)
 457                 *return_resource = resource;
 458         else
 459                 resource->release(client, resource);
 460
 461         client_put(client);
 462
 463         return 0;
 464 }
 465
 466 static void release_transaction(struct client *client,
 467                                 struct client_resource *resource)
 468 {
 469         struct outbound_transaction_resource *r = container_of(resource,
 470                         struct outbound_transaction_resource, resource);
 471
 472         fw_cancel_transaction(client->device->card, &r->transaction);
 473 }
 474
 475 static void complete_transaction(struct fw_card *card, int rcode,
 476                                  void *payload, size_t length, void *data)
 477 {
 478         struct outbound_transaction_event *e = data;
 479         struct fw_cdev_event_response *rsp = &e->response;
 480         struct client *client = e->client;
 481         unsigned long flags;
 482
 483         if (length < rsp->length)
 484                 rsp->length = length;
 485         if (rcode == RCODE_COMPLETE)
 486                 memcpy(rsp->data, payload, rsp->length);
 487
 488         spin_lock_irqsave(&client->lock, flags);
 489         /*
 490          * 1. If called while in shutdown, the idr tree must be left untouched.
 491          *    The idr handle will be removed and the client reference will be
 492          *    dropped later.
 493          * 2. If the call chain was release_client_resource ->
 494          *    release_transaction -> complete_transaction (instead of a normal
 495          *    conclusion of the transaction), i.e. if this resource was already
 496          *    unregistered from the idr, the client reference will be dropped
 497          *    by release_client_resource and we must not drop it here.
 498          */
 499         if (!client->in_shutdown &&
 500             idr_find(&client->resource_idr, e->r.resource.handle)) {
 501                 idr_remove(&client->resource_idr, e->r.resource.handle);
 502                 /* Drop the idr's reference */
 503                 client_put(client);
 504         }
 505         spin_unlock_irqrestore(&client->lock, flags);
 506
 507         rsp->type = FW_CDEV_EVENT_RESPONSE;
 508         rsp->rcode = rcode;
 509
 510         /*
 511          * In the case that sizeof(*rsp) doesn't align with the position of the
 512          * data, and the read is short, preserve an extra copy of the data
 513          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 514          * for short reads and some apps depended on it, this is both safe
 515          * and prudent for compatibility.
 516          */
 517         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 518                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 519                             rsp->data, rsp->length);
 520         else
 521                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 522                             NULL, 0);
 523
 524         /* Drop the transaction callback's reference */
 525         client_put(client);
 526 }
 527
 528 static int init_request(struct client *client,
 529                         struct fw_cdev_send_request *request,
 530                         int destination_id, int speed)
 531 {
 532         struct outbound_transaction_event *e;
 533         int ret;
 534
 535         if (request->tcode != TCODE_STREAM_DATA &&
 536             (request->length > 4096 || request->length > 512 << speed))
 537                 return -EIO;
 538
 539         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 540         if (e == NULL)
 541                 return -ENOMEM;
 542
 543         e->client = client;
 544         e->response.length = request->length;
 545         e->response.closure = request->closure;
 546
 547         if (request->data &&
 548             copy_from_user(e->response.data,
 549                            u64_to_uptr(request->data), request->length)) {
 550                 ret = -EFAULT;
 551                 goto failed;
 552         }
 553
 554         e->r.resource.release = release_transaction;
 555         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 556         if (ret < 0)
 557                 goto failed;
 558
 559         /* Get a reference for the transaction callback */
 560         client_get(client);
 561
 562         fw_send_request(client->device->card, &e->r.transaction,
 563                         request->tcode, destination_id, request->generation,
 564                         speed, request->offset, e->response.data,
 565                         request->length, complete_transaction, e);
 566         return 0;
 567
 568  failed:
 569         kfree(e);
 570
 571         return ret;
 572 }
 573
 574 static int ioctl_send_request(struct client *client, void *buffer)
 575 {
 576         struct fw_cdev_send_request *request = buffer;
 577
 578         switch (request->tcode) {
 579         case TCODE_WRITE_QUADLET_REQUEST:
 580         case TCODE_WRITE_BLOCK_REQUEST:
 581         case TCODE_READ_QUADLET_REQUEST:
 582         case TCODE_READ_BLOCK_REQUEST:
 583         case TCODE_LOCK_MASK_SWAP:
 584         case TCODE_LOCK_COMPARE_SWAP:
 585         case TCODE_LOCK_FETCH_ADD:
 586         case TCODE_LOCK_LITTLE_ADD:
 587         case TCODE_LOCK_BOUNDED_ADD:
 588         case TCODE_LOCK_WRAP_ADD:
 589         case TCODE_LOCK_VENDOR_DEPENDENT:
 590                 break;
 591         default:
 592                 return -EINVAL;
 593         }
 594
 595         return init_request(client, request, client->device->node_id,
 596                             client->device->max_speed);
 597 }
 598
 599 static inline bool is_fcp_request(struct fw_request *request)
 600 {
 601         return request == NULL;
 602 }
 603
 604 static void release_request(struct client *client,
 605                             struct client_resource *resource)
 606 {
 607         struct inbound_transaction_resource *r = container_of(resource,
 608                         struct inbound_transaction_resource, resource);
 609
 610         if (is_fcp_request(r->request))
 611                 kfree(r->data);
 612         else
 613                 fw_send_response(client->device->card, r->request,
 614                                  RCODE_CONFLICT_ERROR);
 615         kfree(r);
 616 }
 617
 618 static void handle_request(struct fw_card *card, struct fw_request *request,
 619                            int tcode, int destination, int source,
 620                            int generation, int speed,
 621                            unsigned long long offset,
 622                            void *payload, size_t length, void *callback_data)
 623 {
 624         struct address_handler_resource *handler = callback_data;
 625         struct inbound_transaction_resource *r;
 626         struct inbound_transaction_event *e;
 627         void *fcp_frame = NULL;
 628         int ret;
 629
 630         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 631         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 632         if (r == NULL || e == NULL)
 633                 goto failed;
 634
 635         r->request = request;
 636         r->data    = payload;
 637         r->length  = length;
 638
 639         if (is_fcp_request(request)) {
 640                 /*
 641                  * FIXME: Let core-transaction.c manage a
 642                  * single reference-counted copy?
 643                  */
 644                 fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
 645                 if (fcp_frame == NULL)
 646                         goto failed;
 647
 648                 r->data = fcp_frame;
 649         }
 650
 651         r->resource.release = release_request;
 652         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 653         if (ret < 0)
 654                 goto failed;
 655
 656         e->request.type    = FW_CDEV_EVENT_REQUEST;
 657         e->request.tcode   = tcode;
 658         e->request.offset  = offset;
 659         e->request.length  = length;
 660         e->request.handle  = r->resource.handle;
 661         e->request.closure = handler->closure;
 662
 663         queue_event(handler->client, &e->event,
 664                     &e->request, sizeof(e->request), r->data, length);
 665         return;
 666
 667  failed:
 668         kfree(r);
 669         kfree(e);
 670         kfree(fcp_frame);
 671
 672         if (!is_fcp_request(request))
 673                 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 674 }
 675
 676 static void release_address_handler(struct client *client,
 677                                     struct client_resource *resource)
 678 {
 679         struct address_handler_resource *r =
 680             container_of(resource, struct address_handler_resource, resource);
 681
 682         fw_core_remove_address_handler(&r->handler);
 683         kfree(r);
 684 }
 685
 686 static int ioctl_allocate(struct client *client, void *buffer)
 687 {
 688         struct fw_cdev_allocate *request = buffer;
 689         struct address_handler_resource *r;
 690         struct fw_address_region region;
 691         int ret;
 692
 693         r = kmalloc(sizeof(*r), GFP_KERNEL);
 694         if (r == NULL)
 695                 return -ENOMEM;
 696
 697         region.start = request->offset;
 698         region.end = request->offset + request->length;
 699         r->handler.length = request->length;
 700         r->handler.address_callback = handle_request;
 701         r->handler.callback_data = r;
 702         r->closure = request->closure;
 703         r->client = client;
 704
 705         ret = fw_core_add_address_handler(&r->handler, &region);
 706         if (ret < 0) {
 707                 kfree(r);
 708                 return ret;
 709         }
 710
 711         r->resource.release = release_address_handler;
 712         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 713         if (ret < 0) {
 714                 release_address_handler(client, &r->resource);
 715                 return ret;
 716         }
 717         request->handle = r->resource.handle;
 718
 719         return 0;
 720 }
 721
 722 static int ioctl_deallocate(struct client *client, void *buffer)
 723 {
 724         struct fw_cdev_deallocate *request = buffer;
 725
 726         return release_client_resource(client, request->handle,
 727                                        release_address_handler, NULL);
 728 }
 729
 730 static int ioctl_send_response(struct client *client, void *buffer)
 731 {
 732         struct fw_cdev_send_response *request = buffer;
 733         struct client_resource *resource;
 734         struct inbound_transaction_resource *r;
 735         int ret = 0;
 736
 737         if (release_client_resource(client, request->handle,
 738                                     release_request, &resource) < 0)
 739                 return -EINVAL;
 740
 741         r = container_of(resource, struct inbound_transaction_resource,
 742                          resource);
 743         if (is_fcp_request(r->request))
 744                 goto out;
 745
 746         if (request->length < r->length)
 747                 r->length = request->length;
 748         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) {
 749                 ret = -EFAULT;
 750                 kfree(r->request);
 751                 goto out;
 752         }
 753         fw_send_response(client->device->card, r->request, request->rcode);
 754  out:
 755         kfree(r);
 756
 757         return ret;
 758 }
 759
 760 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 761 {
 762         struct fw_cdev_initiate_bus_reset *request = buffer;
 763         int short_reset;
 764
 765         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 766
 767         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 768 }
 769
 770 static void release_descriptor(struct client *client,
 771                                struct client_resource *resource)
 772 {
 773         struct descriptor_resource *r =
 774                 container_of(resource, struct descriptor_resource, resource);
 775
 776         fw_core_remove_descriptor(&r->descriptor);
 777         kfree(r);
 778 }
 779
 780 static int ioctl_add_descriptor(struct client *client, void *buffer)
 781 {
 782         struct fw_cdev_add_descriptor *request = buffer;
 783         struct descriptor_resource *r;
 784         int ret;
 785
 786         /* Access policy: Allow this ioctl only on local nodes' device files. */
 787         if (!client->device->is_local)
 788                 return -ENOSYS;
 789
 790         if (request->length > 256)
 791                 return -EINVAL;
 792
 793         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 794         if (r == NULL)
 795                 return -ENOMEM;
 796
 797         if (copy_from_user(r->data,
 798                            u64_to_uptr(request->data), request->length * 4)) {
 799                 ret = -EFAULT;
 800                 goto failed;
 801         }
 802
 803         r->descriptor.length    = request->length;
 804         r->descriptor.immediate = request->immediate;
 805         r->descriptor.key       = request->key;
 806         r->descriptor.data      = r->data;
 807
 808         ret = fw_core_add_descriptor(&r->descriptor);
 809         if (ret < 0)
 810                 goto failed;
 811
 812         r->resource.release = release_descriptor;
 813         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 814         if (ret < 0) {
 815                 fw_core_remove_descriptor(&r->descriptor);
 816                 goto failed;
 817         }
 818         request->handle = r->resource.handle;
 819
 820         return 0;
 821  failed:
 822         kfree(r);
 823
 824         return ret;
 825 }
 826
 827 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 828 {
 829         struct fw_cdev_remove_descriptor *request = buffer;
 830
 831         return release_client_resource(client, request->handle,
 832                                        release_descriptor, NULL);
 833 }
 834
 835 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 836                          size_t header_length, void *header, void *data)
 837 {
 838         struct client *client = data;
 839         struct iso_interrupt_event *e;
 840
 841         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 842         if (e == NULL)
 843                 return;
 844
 845         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 846         e->interrupt.closure   = client->iso_closure;
 847         e->interrupt.cycle     = cycle;
 848         e->interrupt.header_length = header_length;
 849         memcpy(e->interrupt.header, header, header_length);
 850         queue_event(client, &e->event, &e->interrupt,
 851                     sizeof(e->interrupt) + header_length, NULL, 0);
 852 }
 853
 854 static int ioctl_create_iso_context(struct client *client, void *buffer)
 855 {
 856         struct fw_cdev_create_iso_context *request = buffer;
 857         struct fw_iso_context *context;
 858
 859         /* We only support one context at this time. */
 860         if (client->iso_context != NULL)
 861                 return -EBUSY;
 862
 863         if (request->channel > 63)
 864                 return -EINVAL;
 865
 866         switch (request->type) {
 867         case FW_ISO_CONTEXT_RECEIVE:
 868                 if (request->header_size < 4 || (request->header_size & 3))
 869                         return -EINVAL;
 870
 871                 break;
 872
 873         case FW_ISO_CONTEXT_TRANSMIT:
 874                 if (request->speed > SCODE_3200)
 875                         return -EINVAL;
 876
 877                 break;
 878
 879         default:
 880                 return -EINVAL;
 881         }
 882
 883         context =  fw_iso_context_create(client->device->card,
 884                                          request->type,
 885                                          request->channel,
 886                                          request->speed,
 887                                          request->header_size,
 888                                          iso_callback, client);
 889         if (IS_ERR(context))
 890                 return PTR_ERR(context);
 891
 892         client->iso_closure = request->closure;
 893         client->iso_context = context;
 894
 895         /* We only support one context at this time. */
 896         request->handle = 0;
 897
 898         return 0;
 899 }
 900
 901 /* Macros for decoding the iso packet control header. */
 902 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 903 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 904 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 905 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 906 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 907 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 908
 909 static int ioctl_queue_iso(struct client *client, void *buffer)
 910 {
 911         struct fw_cdev_queue_iso *request = buffer;
 912         struct fw_cdev_iso_packet __user *p, *end, *next;
 913         struct fw_iso_context *ctx = client->iso_context;
 914         unsigned long payload, buffer_end, header_length;
 915         u32 control;
 916         int count;
 917         struct {
 918                 struct fw_iso_packet packet;
 919                 u8 header[256];
 920         } u;
 921
 922         if (ctx == NULL || request->handle != 0)
 923                 return -EINVAL;
 924
 925         /*
 926          * If the user passes a non-NULL data pointer, has mmap()'ed
 927          * the iso buffer, and the pointer points inside the buffer,
 928          * we setup the payload pointers accordingly.  Otherwise we
 929          * set them both to 0, which will still let packets with
 930          * payload_length == 0 through.  In other words, if no packets
 931          * use the indirect payload, the iso buffer need not be mapped
 932          * and the request->data pointer is ignored.
 933          */
 934
 935         payload = (unsigned long)request->data - client->vm_start;
 936         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 937         if (request->data == 0 || client->buffer.pages == NULL ||
 938             payload >= buffer_end) {
 939                 payload = 0;
 940                 buffer_end = 0;
 941         }
 942
 943         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 944
 945         if (!access_ok(VERIFY_READ, p, request->size))
 946                 return -EFAULT;
 947
 948         end = (void __user *)p + request->size;
 949         count = 0;
 950         while (p < end) {
 951                 if (get_user(control, &p->control))
 952                         return -EFAULT;
 953                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 954                 u.packet.interrupt = GET_INTERRUPT(control);
 955                 u.packet.skip = GET_SKIP(control);
 956                 u.packet.tag = GET_TAG(control);
 957                 u.packet.sy = GET_SY(control);
 958                 u.packet.header_length = GET_HEADER_LENGTH(control);
 959
 960                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 961                         header_length = u.packet.header_length;
 962                 } else {
 963                         /*
 964                          * We require that header_length is a multiple of
 965                          * the fixed header size, ctx->header_size.
 966                          */
 967                         if (ctx->header_size == 0) {
 968                                 if (u.packet.header_length > 0)
 969                                         return -EINVAL;
 970                         } else if (u.packet.header_length % ctx->header_size != 0) {
 971                                 return -EINVAL;
 972                         }
 973                         header_length = 0;
 974                 }
 975
 976                 next = (struct fw_cdev_iso_packet __user *)
 977                         &p->header[header_length / 4];
 978                 if (next > end)
 979                         return -EINVAL;
 980                 if (__copy_from_user
 981                     (u.packet.header, p->header, header_length))
 982                         return -EFAULT;
 983                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 984                     u.packet.header_length + u.packet.payload_length > 0)
 985                         return -EINVAL;
 986                 if (payload + u.packet.payload_length > buffer_end)
 987                         return -EINVAL;
 988
 989                 if (fw_iso_context_queue(ctx, &u.packet,
 990                                          &client->buffer, payload))
 991                         break;
 992
 993                 p = next;
 994                 payload += u.packet.payload_length;
 995                 count++;
 996         }
 997
 998         request->size    -= uptr_to_u64(p) - request->packets;
 999         request->packets  = uptr_to_u64(p);
1000         request->data     = client->vm_start + payload;
1001
1002         return count;
1003 }
1004
1005 static int ioctl_start_iso(struct client *client, void *buffer)
1006 {
1007         struct fw_cdev_start_iso *request = buffer;
1008
1009         if (client->iso_context == NULL || request->handle != 0)
1010                 return -EINVAL;
1011
1012         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
1013                 if (request->tags == 0 || request->tags > 15)
1014                         return -EINVAL;
1015
1016                 if (request->sync > 15)
1017                         return -EINVAL;
1018         }
1019
1020         return fw_iso_context_start(client->iso_context, request->cycle,
1021                                     request->sync, request->tags);
1022 }
1023
1024 static int ioctl_stop_iso(struct client *client, void *buffer)
1025 {
1026         struct fw_cdev_stop_iso *request = buffer;
1027
1028         if (client->iso_context == NULL || request->handle != 0)
1029                 return -EINVAL;
1030
1031         return fw_iso_context_stop(client->iso_context);
1032 }
1033
1034 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
1035 {
1036         struct fw_cdev_get_cycle_timer *request = buffer;
1037         struct fw_card *card = client->device->card;
1038         unsigned long long bus_time;
1039         struct timeval tv;
1040         unsigned long flags;
1041
1042         preempt_disable();
1043         local_irq_save(flags);
1044
1045         bus_time = card->driver->get_bus_time(card);
1046         do_gettimeofday(&tv);
1047
1048         local_irq_restore(flags);
1049         preempt_enable();
1050
1051         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1052         request->cycle_timer = bus_time & 0xffffffff;
1053         return 0;
1054 }
1055
1056 static void iso_resource_work(struct work_struct *work)
1057 {
1058         struct iso_resource_event *e;
1059         struct iso_resource *r =
1060                         container_of(work, struct iso_resource, work.work);
1061         struct client *client = r->client;
1062         int generation, channel, bandwidth, todo;
1063         bool skip, free, success;
1064
1065         spin_lock_irq(&client->lock);
1066         generation = client->device->generation;
1067         todo = r->todo;
1068         /* Allow 1000ms grace period for other reallocations. */
1069         if (todo == ISO_RES_ALLOC &&
1070             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1071                 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1072                 skip = true;
1073         } else {
1074                 /* We could be called twice within the same generation. */
1075                 skip = todo == ISO_RES_REALLOC &&
1076                        r->generation == generation;
1077         }
1078         free = todo == ISO_RES_DEALLOC ||
1079                todo == ISO_RES_ALLOC_ONCE ||
1080                todo == ISO_RES_DEALLOC_ONCE;
1081         r->generation = generation;
1082         spin_unlock_irq(&client->lock);
1083
1084         if (skip)
1085                 goto out;
1086
1087         bandwidth = r->bandwidth;
1088
1089         fw_iso_resource_manage(client->device->card, generation,
1090                         r->channels, &channel, &bandwidth,
1091                         todo == ISO_RES_ALLOC ||
1092                         todo == ISO_RES_REALLOC ||
1093                         todo == ISO_RES_ALLOC_ONCE,
1094                         r->transaction_data);
1095         /*
1096          * Is this generation outdated already?  As long as this resource sticks
1097          * in the idr, it will be scheduled again for a newer generation or at
1098          * shutdown.
1099          */
1100         if (channel == -EAGAIN &&
1101             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1102                 goto out;
1103
1104         success = channel >= 0 || bandwidth > 0;
1105
1106         spin_lock_irq(&client->lock);
1107         /*
1108          * Transit from allocation to reallocation, except if the client
1109          * requested deallocation in the meantime.
1110          */
1111         if (r->todo == ISO_RES_ALLOC)
1112                 r->todo = ISO_RES_REALLOC;
1113         /*
1114          * Allocation or reallocation failure?  Pull this resource out of the
1115          * idr and prepare for deletion, unless the client is shutting down.
1116          */
1117         if (r->todo == ISO_RES_REALLOC && !success &&
1118             !client->in_shutdown &&
1119             idr_find(&client->resource_idr, r->resource.handle)) {
1120                 idr_remove(&client->resource_idr, r->resource.handle);
1121                 client_put(client);
1122                 free = true;
1123         }
1124         spin_unlock_irq(&client->lock);
1125
1126         if (todo == ISO_RES_ALLOC && channel >= 0)
1127                 r->channels = 1ULL << channel;
1128
1129         if (todo == ISO_RES_REALLOC && success)
1130                 goto out;
1131
1132         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1133                 e = r->e_alloc;
1134                 r->e_alloc = NULL;
1135         } else {
1136                 e = r->e_dealloc;
1137                 r->e_dealloc = NULL;
1138         }
1139         e->iso_resource.handle    = r->resource.handle;
1140         e->iso_resource.channel   = channel;
1141         e->iso_resource.bandwidth = bandwidth;
1142
1143         queue_event(client, &e->event,
1144                     &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1145
1146         if (free) {
1147                 cancel_delayed_work(&r->work);
1148                 kfree(r->e_alloc);
1149                 kfree(r->e_dealloc);
1150                 kfree(r);
1151         }
1152  out:
1153         client_put(client);
1154 }
1155
1156 static void release_iso_resource(struct client *client,
1157                                  struct client_resource *resource)
1158 {
1159         struct iso_resource *r =
1160                 container_of(resource, struct iso_resource, resource);
1161
1162         spin_lock_irq(&client->lock);
1163         r->todo = ISO_RES_DEALLOC;
1164         schedule_iso_resource(r, 0);
1165         spin_unlock_irq(&client->lock);
1166 }
1167
1168 static int init_iso_resource(struct client *client,
1169                 struct fw_cdev_allocate_iso_resource *request, int todo)
1170 {
1171         struct iso_resource_event *e1, *e2;
1172         struct iso_resource *r;
1173         int ret;
1174
1175         if ((request->channels == 0 && request->bandwidth == 0) ||
1176             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1177             request->bandwidth < 0)
1178                 return -EINVAL;
1179
1180         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1181         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1182         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1183         if (r == NULL || e1 == NULL || e2 == NULL) {
1184                 ret = -ENOMEM;
1185                 goto fail;
1186         }
1187
1188         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1189         r->client       = client;
1190         r->todo         = todo;
1191         r->generation   = -1;
1192         r->channels     = request->channels;
1193         r->bandwidth    = request->bandwidth;
1194         r->e_alloc      = e1;
1195         r->e_dealloc    = e2;
1196
1197         e1->iso_resource.closure = request->closure;
1198         e1->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1199         e2->iso_resource.closure = request->closure;
1200         e2->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1201
1202         if (todo == ISO_RES_ALLOC) {
1203                 r->resource.release = release_iso_resource;
1204                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1205                 if (ret < 0)
1206                         goto fail;
1207         } else {
1208                 r->resource.release = NULL;
1209                 r->resource.handle = -1;
1210                 schedule_iso_resource(r, 0);
1211         }
1212         request->handle = r->resource.handle;
1213
1214         return 0;
1215  fail:
1216         kfree(r);
1217         kfree(e1);
1218         kfree(e2);
1219
1220         return ret;
1221 }
1222
1223 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1224 {
1225         struct fw_cdev_allocate_iso_resource *request = buffer;
1226
1227         return init_iso_resource(client, request, ISO_RES_ALLOC);
1228 }
1229
1230 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1231 {
1232         struct fw_cdev_deallocate *request = buffer;
1233
1234         return release_client_resource(client, request->handle,
1235                                        release_iso_resource, NULL);
1236 }
1237
1238 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1239 {
1240         struct fw_cdev_allocate_iso_resource *request = buffer;
1241
1242         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1243 }
1244
1245 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1246 {
1247         struct fw_cdev_allocate_iso_resource *request = buffer;
1248
1249         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1250 }
1251
1252 /*
1253  * Returns a speed code:  Maximum speed to or from this device,
1254  * limited by the device's link speed, the local node's link speed,
1255  * and all PHY port speeds between the two links.
1256  */
1257 static int ioctl_get_speed(struct client *client, void *buffer)
1258 {
1259         return client->device->max_speed;
1260 }
1261
1262 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1263 {
1264         struct fw_cdev_send_request *request = buffer;
1265
1266         switch (request->tcode) {
1267         case TCODE_WRITE_QUADLET_REQUEST:
1268         case TCODE_WRITE_BLOCK_REQUEST:
1269                 break;
1270         default:
1271                 return -EINVAL;
1272         }
1273
1274         /* Security policy: Only allow accesses to Units Space. */
1275         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1276                 return -EACCES;
1277
1278         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1279 }
1280
1281 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1282 {
1283         struct fw_cdev_send_stream_packet *p = buffer;
1284         struct fw_cdev_send_request request;
1285         int dest;
1286
1287         if (p->speed > client->device->card->link_speed ||
1288             p->length > 1024 << p->speed)
1289                 return -EIO;
1290
1291         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1292                 return -EINVAL;
1293
1294         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1295         request.tcode           = TCODE_STREAM_DATA;
1296         request.length          = p->length;
1297         request.closure         = p->closure;
1298         request.data            = p->data;
1299         request.generation      = p->generation;
1300
1301         return init_request(client, &request, dest, p->speed);
1302 }
1303
1304 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1305         ioctl_get_info,
1306         ioctl_send_request,
1307         ioctl_allocate,
1308         ioctl_deallocate,
1309         ioctl_send_response,
1310         ioctl_initiate_bus_reset,
1311         ioctl_add_descriptor,
1312         ioctl_remove_descriptor,
1313         ioctl_create_iso_context,
1314         ioctl_queue_iso,
1315         ioctl_start_iso,
1316         ioctl_stop_iso,
1317         ioctl_get_cycle_timer,
1318         ioctl_allocate_iso_resource,
1319         ioctl_deallocate_iso_resource,
1320         ioctl_allocate_iso_resource_once,
1321         ioctl_deallocate_iso_resource_once,
1322         ioctl_get_speed,
1323         ioctl_send_broadcast_request,
1324         ioctl_send_stream_packet,
1325 };
1326
1327 static int dispatch_ioctl(struct client *client,
1328                           unsigned int cmd, void __user *arg)
1329 {
1330         char buffer[sizeof(union {
1331                 struct fw_cdev_get_info                 _00;
1332                 struct fw_cdev_send_request             _01;
1333                 struct fw_cdev_allocate                 _02;
1334                 struct fw_cdev_deallocate               _03;
1335                 struct fw_cdev_send_response            _04;
1336                 struct fw_cdev_initiate_bus_reset       _05;
1337                 struct fw_cdev_add_descriptor           _06;
1338                 struct fw_cdev_remove_descriptor        _07;
1339                 struct fw_cdev_create_iso_context       _08;
1340                 struct fw_cdev_queue_iso                _09;
1341                 struct fw_cdev_start_iso                _0a;
1342                 struct fw_cdev_stop_iso                 _0b;
1343                 struct fw_cdev_get_cycle_timer          _0c;
1344                 struct fw_cdev_allocate_iso_resource    _0d;
1345                 struct fw_cdev_send_stream_packet       _13;
1346         })];
1347         int ret;
1348
1349         if (_IOC_TYPE(cmd) != '#' ||
1350             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1351                 return -EINVAL;
1352
1353         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1354                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1355                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1356                         return -EFAULT;
1357         }
1358
1359         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1360         if (ret < 0)
1361                 return ret;
1362
1363         if (_IOC_DIR(cmd) & _IOC_READ) {
1364                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1365                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1366                         return -EFAULT;
1367         }
1368
1369         return ret;
1370 }
1371
1372 static long fw_device_op_ioctl(struct file *file,
1373                                unsigned int cmd, unsigned long arg)
1374 {
1375         struct client *client = file->private_data;
1376
1377         if (fw_device_is_shutdown(client->device))
1378                 return -ENODEV;
1379
1380         return dispatch_ioctl(client, cmd, (void __user *) arg);
1381 }
1382
1383 #ifdef CONFIG_COMPAT
1384 static long fw_device_op_compat_ioctl(struct file *file,
1385                                       unsigned int cmd, unsigned long arg)
1386 {
1387         struct client *client = file->private_data;
1388
1389         if (fw_device_is_shutdown(client->device))
1390                 return -ENODEV;
1391
1392         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1393 }
1394 #endif
1395
1396 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1397 {
1398         struct client *client = file->private_data;
1399         enum dma_data_direction direction;
1400         unsigned long size;
1401         int page_count, ret;
1402
1403         if (fw_device_is_shutdown(client->device))
1404                 return -ENODEV;
1405
1406         /* FIXME: We could support multiple buffers, but we don't. */
1407         if (client->buffer.pages != NULL)
1408                 return -EBUSY;
1409
1410         if (!(vma->vm_flags & VM_SHARED))
1411                 return -EINVAL;
1412
1413         if (vma->vm_start & ~PAGE_MASK)
1414                 return -EINVAL;
1415
1416         client->vm_start = vma->vm_start;
1417         size = vma->vm_end - vma->vm_start;
1418         page_count = size >> PAGE_SHIFT;
1419         if (size & ~PAGE_MASK)
1420                 return -EINVAL;
1421
1422         if (vma->vm_flags & VM_WRITE)
1423                 direction = DMA_TO_DEVICE;
1424         else
1425                 direction = DMA_FROM_DEVICE;
1426
1427         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1428                                  page_count, direction);
1429         if (ret < 0)
1430                 return ret;
1431
1432         ret = fw_iso_buffer_map(&client->buffer, vma);
1433         if (ret < 0)
1434                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1435
1436         return ret;
1437 }
1438
1439 static int shutdown_resource(int id, void *p, void *data)
1440 {
1441         struct client_resource *resource = p;
1442         struct client *client = data;
1443
1444         resource->release(client, resource);
1445         client_put(client);
1446
1447         return 0;
1448 }
1449
1450 static int fw_device_op_release(struct inode *inode, struct file *file)
1451 {
1452         struct client *client = file->private_data;
1453         struct event *event, *next_event;
1454
1455         mutex_lock(&client->device->client_list_mutex);
1456         list_del(&client->link);
1457         mutex_unlock(&client->device->client_list_mutex);
1458
1459         if (client->iso_context)
1460                 fw_iso_context_destroy(client->iso_context);
1461
1462         if (client->buffer.pages)
1463                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1464
1465         /* Freeze client->resource_idr and client->event_list */
1466         spin_lock_irq(&client->lock);
1467         client->in_shutdown = true;
1468         spin_unlock_irq(&client->lock);
1469
1470         idr_for_each(&client->resource_idr, shutdown_resource, client);
1471         idr_remove_all(&client->resource_idr);
1472         idr_destroy(&client->resource_idr);
1473
1474         list_for_each_entry_safe(event, next_event, &client->event_list, link)
1475                 kfree(event);
1476
1477         client_put(client);
1478
1479         return 0;
1480 }
1481
1482 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1483 {
1484         struct client *client = file->private_data;
1485         unsigned int mask = 0;
1486
1487         poll_wait(file, &client->wait, pt);
1488
1489         if (fw_device_is_shutdown(client->device))
1490                 mask |= POLLHUP | POLLERR;
1491         if (!list_empty(&client->event_list))
1492                 mask |= POLLIN | POLLRDNORM;
1493
1494         return mask;
1495 }
1496
1497 const struct file_operations fw_device_ops = {
1498         .owner          = THIS_MODULE,
1499         .open           = fw_device_op_open,
1500         .read           = fw_device_op_read,
1501         .unlocked_ioctl = fw_device_op_ioctl,
1502         .poll           = fw_device_op_poll,
1503         .release        = fw_device_op_release,
1504         .mmap           = fw_device_op_mmap,
1505
1506 #ifdef CONFIG_COMPAT
1507         .compat_ioctl   = fw_device_op_compat_ioctl,
1508 #endif
1509 };