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/irqflags.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/kernel.h>
  31 #include <linux/kref.h>
  32 #include <linux/mm.h>
  33 #include <linux/module.h>
  34 #include <linux/mutex.h>
  35 #include <linux/poll.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 nonseekable_open(inode, file);
 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 union ioctl_arg {
 372         struct fw_cdev_get_info                 get_info;
 373         struct fw_cdev_send_request             send_request;
 374         struct fw_cdev_allocate                 allocate;
 375         struct fw_cdev_deallocate               deallocate;
 376         struct fw_cdev_send_response            send_response;
 377         struct fw_cdev_initiate_bus_reset       initiate_bus_reset;
 378         struct fw_cdev_add_descriptor           add_descriptor;
 379         struct fw_cdev_remove_descriptor        remove_descriptor;
 380         struct fw_cdev_create_iso_context       create_iso_context;
 381         struct fw_cdev_queue_iso                queue_iso;
 382         struct fw_cdev_start_iso                start_iso;
 383         struct fw_cdev_stop_iso                 stop_iso;
 384         struct fw_cdev_get_cycle_timer          get_cycle_timer;
 385         struct fw_cdev_allocate_iso_resource    allocate_iso_resource;
 386         struct fw_cdev_send_stream_packet       send_stream_packet;
 387         struct fw_cdev_get_cycle_timer2         get_cycle_timer2;
 388 };
 389
 390 static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
 391 {
 392         struct fw_cdev_get_info *a = &arg->get_info;
 393         struct fw_cdev_event_bus_reset bus_reset;
 394         unsigned long ret = 0;
 395
 396         client->version = a->version;
 397         a->version = FW_CDEV_VERSION;
 398         a->card = client->device->card->index;
 399
 400         down_read(&fw_device_rwsem);
 401
 402         if (a->rom != 0) {
 403                 size_t want = a->rom_length;
 404                 size_t have = client->device->config_rom_length * 4;
 405
 406                 ret = copy_to_user(u64_to_uptr(a->rom),
 407                                    client->device->config_rom, min(want, have));
 408         }
 409         a->rom_length = client->device->config_rom_length * 4;
 410
 411         up_read(&fw_device_rwsem);
 412
 413         if (ret != 0)
 414                 return -EFAULT;
 415
 416         client->bus_reset_closure = a->bus_reset_closure;
 417         if (a->bus_reset != 0) {
 418                 fill_bus_reset_event(&bus_reset, client);
 419                 if (copy_to_user(u64_to_uptr(a->bus_reset),
 420                                  &bus_reset, sizeof(bus_reset)))
 421                         return -EFAULT;
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int add_client_resource(struct client *client,
 428                                struct client_resource *resource, gfp_t gfp_mask)
 429 {
 430         unsigned long flags;
 431         int ret;
 432
 433  retry:
 434         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 435                 return -ENOMEM;
 436
 437         spin_lock_irqsave(&client->lock, flags);
 438         if (client->in_shutdown)
 439                 ret = -ECANCELED;
 440         else
 441                 ret = idr_get_new(&client->resource_idr, resource,
 442                                   &resource->handle);
 443         if (ret >= 0) {
 444                 client_get(client);
 445                 schedule_if_iso_resource(resource);
 446         }
 447         spin_unlock_irqrestore(&client->lock, flags);
 448
 449         if (ret == -EAGAIN)
 450                 goto retry;
 451
 452         return ret < 0 ? ret : 0;
 453 }
 454
 455 static int release_client_resource(struct client *client, u32 handle,
 456                                    client_resource_release_fn_t release,
 457                                    struct client_resource **return_resource)
 458 {
 459         struct client_resource *resource;
 460
 461         spin_lock_irq(&client->lock);
 462         if (client->in_shutdown)
 463                 resource = NULL;
 464         else
 465                 resource = idr_find(&client->resource_idr, handle);
 466         if (resource && resource->release == release)
 467                 idr_remove(&client->resource_idr, handle);
 468         spin_unlock_irq(&client->lock);
 469
 470         if (!(resource && resource->release == release))
 471                 return -EINVAL;
 472
 473         if (return_resource)
 474                 *return_resource = resource;
 475         else
 476                 resource->release(client, resource);
 477
 478         client_put(client);
 479
 480         return 0;
 481 }
 482
 483 static void release_transaction(struct client *client,
 484                                 struct client_resource *resource)
 485 {
 486         struct outbound_transaction_resource *r = container_of(resource,
 487                         struct outbound_transaction_resource, resource);
 488
 489         fw_cancel_transaction(client->device->card, &r->transaction);
 490 }
 491
 492 static void complete_transaction(struct fw_card *card, int rcode,
 493                                  void *payload, size_t length, void *data)
 494 {
 495         struct outbound_transaction_event *e = data;
 496         struct fw_cdev_event_response *rsp = &e->response;
 497         struct client *client = e->client;
 498         unsigned long flags;
 499
 500         if (length < rsp->length)
 501                 rsp->length = length;
 502         if (rcode == RCODE_COMPLETE)
 503                 memcpy(rsp->data, payload, rsp->length);
 504
 505         spin_lock_irqsave(&client->lock, flags);
 506         /*
 507          * 1. If called while in shutdown, the idr tree must be left untouched.
 508          *    The idr handle will be removed and the client reference will be
 509          *    dropped later.
 510          * 2. If the call chain was release_client_resource ->
 511          *    release_transaction -> complete_transaction (instead of a normal
 512          *    conclusion of the transaction), i.e. if this resource was already
 513          *    unregistered from the idr, the client reference will be dropped
 514          *    by release_client_resource and we must not drop it here.
 515          */
 516         if (!client->in_shutdown &&
 517             idr_find(&client->resource_idr, e->r.resource.handle)) {
 518                 idr_remove(&client->resource_idr, e->r.resource.handle);
 519                 /* Drop the idr's reference */
 520                 client_put(client);
 521         }
 522         spin_unlock_irqrestore(&client->lock, flags);
 523
 524         rsp->type = FW_CDEV_EVENT_RESPONSE;
 525         rsp->rcode = rcode;
 526
 527         /*
 528          * In the case that sizeof(*rsp) doesn't align with the position of the
 529          * data, and the read is short, preserve an extra copy of the data
 530          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 531          * for short reads and some apps depended on it, this is both safe
 532          * and prudent for compatibility.
 533          */
 534         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 535                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 536                             rsp->data, rsp->length);
 537         else
 538                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 539                             NULL, 0);
 540
 541         /* Drop the transaction callback's reference */
 542         client_put(client);
 543 }
 544
 545 static int init_request(struct client *client,
 546                         struct fw_cdev_send_request *request,
 547                         int destination_id, int speed)
 548 {
 549         struct outbound_transaction_event *e;
 550         int ret;
 551
 552         if (request->tcode != TCODE_STREAM_DATA &&
 553             (request->length > 4096 || request->length > 512 << speed))
 554                 return -EIO;
 555
 556         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 557         if (e == NULL)
 558                 return -ENOMEM;
 559
 560         e->client = client;
 561         e->response.length = request->length;
 562         e->response.closure = request->closure;
 563
 564         if (request->data &&
 565             copy_from_user(e->response.data,
 566                            u64_to_uptr(request->data), request->length)) {
 567                 ret = -EFAULT;
 568                 goto failed;
 569         }
 570
 571         e->r.resource.release = release_transaction;
 572         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 573         if (ret < 0)
 574                 goto failed;
 575
 576         /* Get a reference for the transaction callback */
 577         client_get(client);
 578
 579         fw_send_request(client->device->card, &e->r.transaction,
 580                         request->tcode, destination_id, request->generation,
 581                         speed, request->offset, e->response.data,
 582                         request->length, complete_transaction, e);
 583         return 0;
 584
 585  failed:
 586         kfree(e);
 587
 588         return ret;
 589 }
 590
 591 static int ioctl_send_request(struct client *client, union ioctl_arg *arg)
 592 {
 593         switch (arg->send_request.tcode) {
 594         case TCODE_WRITE_QUADLET_REQUEST:
 595         case TCODE_WRITE_BLOCK_REQUEST:
 596         case TCODE_READ_QUADLET_REQUEST:
 597         case TCODE_READ_BLOCK_REQUEST:
 598         case TCODE_LOCK_MASK_SWAP:
 599         case TCODE_LOCK_COMPARE_SWAP:
 600         case TCODE_LOCK_FETCH_ADD:
 601         case TCODE_LOCK_LITTLE_ADD:
 602         case TCODE_LOCK_BOUNDED_ADD:
 603         case TCODE_LOCK_WRAP_ADD:
 604         case TCODE_LOCK_VENDOR_DEPENDENT:
 605                 break;
 606         default:
 607                 return -EINVAL;
 608         }
 609
 610         return init_request(client, &arg->send_request, client->device->node_id,
 611                             client->device->max_speed);
 612 }
 613
 614 static inline bool is_fcp_request(struct fw_request *request)
 615 {
 616         return request == NULL;
 617 }
 618
 619 static void release_request(struct client *client,
 620                             struct client_resource *resource)
 621 {
 622         struct inbound_transaction_resource *r = container_of(resource,
 623                         struct inbound_transaction_resource, resource);
 624
 625         if (is_fcp_request(r->request))
 626                 kfree(r->data);
 627         else
 628                 fw_send_response(client->device->card, r->request,
 629                                  RCODE_CONFLICT_ERROR);
 630         kfree(r);
 631 }
 632
 633 static void handle_request(struct fw_card *card, struct fw_request *request,
 634                            int tcode, int destination, int source,
 635                            int generation, unsigned long long offset,
 636                            void *payload, size_t length, void *callback_data)
 637 {
 638         struct address_handler_resource *handler = callback_data;
 639         struct inbound_transaction_resource *r;
 640         struct inbound_transaction_event *e;
 641         void *fcp_frame = NULL;
 642         int ret;
 643
 644         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 645         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 646         if (r == NULL || e == NULL)
 647                 goto failed;
 648
 649         r->request = request;
 650         r->data    = payload;
 651         r->length  = length;
 652
 653         if (is_fcp_request(request)) {
 654                 /*
 655                  * FIXME: Let core-transaction.c manage a
 656                  * single reference-counted copy?
 657                  */
 658                 fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
 659                 if (fcp_frame == NULL)
 660                         goto failed;
 661
 662                 r->data = fcp_frame;
 663         }
 664
 665         r->resource.release = release_request;
 666         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 667         if (ret < 0)
 668                 goto failed;
 669
 670         e->request.type    = FW_CDEV_EVENT_REQUEST;
 671         e->request.tcode   = tcode;
 672         e->request.offset  = offset;
 673         e->request.length  = length;
 674         e->request.handle  = r->resource.handle;
 675         e->request.closure = handler->closure;
 676
 677         queue_event(handler->client, &e->event,
 678                     &e->request, sizeof(e->request), r->data, length);
 679         return;
 680
 681  failed:
 682         kfree(r);
 683         kfree(e);
 684         kfree(fcp_frame);
 685
 686         if (!is_fcp_request(request))
 687                 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 688 }
 689
 690 static void release_address_handler(struct client *client,
 691                                     struct client_resource *resource)
 692 {
 693         struct address_handler_resource *r =
 694             container_of(resource, struct address_handler_resource, resource);
 695
 696         fw_core_remove_address_handler(&r->handler);
 697         kfree(r);
 698 }
 699
 700 static int ioctl_allocate(struct client *client, union ioctl_arg *arg)
 701 {
 702         struct fw_cdev_allocate *a = &arg->allocate;
 703         struct address_handler_resource *r;
 704         struct fw_address_region region;
 705         int ret;
 706
 707         r = kmalloc(sizeof(*r), GFP_KERNEL);
 708         if (r == NULL)
 709                 return -ENOMEM;
 710
 711         region.start = a->offset;
 712         region.end   = a->offset + a->length;
 713         r->handler.length           = a->length;
 714         r->handler.address_callback = handle_request;
 715         r->handler.callback_data    = r;
 716         r->closure   = a->closure;
 717         r->client    = client;
 718
 719         ret = fw_core_add_address_handler(&r->handler, &region);
 720         if (ret < 0) {
 721                 kfree(r);
 722                 return ret;
 723         }
 724
 725         r->resource.release = release_address_handler;
 726         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 727         if (ret < 0) {
 728                 release_address_handler(client, &r->resource);
 729                 return ret;
 730         }
 731         a->handle = r->resource.handle;
 732
 733         return 0;
 734 }
 735
 736 static int ioctl_deallocate(struct client *client, union ioctl_arg *arg)
 737 {
 738         return release_client_resource(client, arg->deallocate.handle,
 739                                        release_address_handler, NULL);
 740 }
 741
 742 static int ioctl_send_response(struct client *client, union ioctl_arg *arg)
 743 {
 744         struct fw_cdev_send_response *a = &arg->send_response;
 745         struct client_resource *resource;
 746         struct inbound_transaction_resource *r;
 747         int ret = 0;
 748
 749         if (release_client_resource(client, a->handle,
 750                                     release_request, &resource) < 0)
 751                 return -EINVAL;
 752
 753         r = container_of(resource, struct inbound_transaction_resource,
 754                          resource);
 755         if (is_fcp_request(r->request))
 756                 goto out;
 757
 758         if (a->length != fw_get_response_length(r->request)) {
 759                 ret = -EINVAL;
 760                 kfree(r->request);
 761                 goto out;
 762         }
 763         if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) {
 764                 ret = -EFAULT;
 765                 kfree(r->request);
 766                 goto out;
 767         }
 768         fw_send_response(client->device->card, r->request, a->rcode);
 769  out:
 770         kfree(r);
 771
 772         return ret;
 773 }
 774
 775 static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg)
 776 {
 777         return fw_core_initiate_bus_reset(client->device->card,
 778                         arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET);
 779 }
 780
 781 static void release_descriptor(struct client *client,
 782                                struct client_resource *resource)
 783 {
 784         struct descriptor_resource *r =
 785                 container_of(resource, struct descriptor_resource, resource);
 786
 787         fw_core_remove_descriptor(&r->descriptor);
 788         kfree(r);
 789 }
 790
 791 static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg)
 792 {
 793         struct fw_cdev_add_descriptor *a = &arg->add_descriptor;
 794         struct descriptor_resource *r;
 795         int ret;
 796
 797         /* Access policy: Allow this ioctl only on local nodes' device files. */
 798         if (!client->device->is_local)
 799                 return -ENOSYS;
 800
 801         if (a->length > 256)
 802                 return -EINVAL;
 803
 804         r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL);
 805         if (r == NULL)
 806                 return -ENOMEM;
 807
 808         if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) {
 809                 ret = -EFAULT;
 810                 goto failed;
 811         }
 812
 813         r->descriptor.length    = a->length;
 814         r->descriptor.immediate = a->immediate;
 815         r->descriptor.key       = a->key;
 816         r->descriptor.data      = r->data;
 817
 818         ret = fw_core_add_descriptor(&r->descriptor);
 819         if (ret < 0)
 820                 goto failed;
 821
 822         r->resource.release = release_descriptor;
 823         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 824         if (ret < 0) {
 825                 fw_core_remove_descriptor(&r->descriptor);
 826                 goto failed;
 827         }
 828         a->handle = r->resource.handle;
 829
 830         return 0;
 831  failed:
 832         kfree(r);
 833
 834         return ret;
 835 }
 836
 837 static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg)
 838 {
 839         return release_client_resource(client, arg->remove_descriptor.handle,
 840                                        release_descriptor, NULL);
 841 }
 842
 843 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 844                          size_t header_length, void *header, void *data)
 845 {
 846         struct client *client = data;
 847         struct iso_interrupt_event *e;
 848
 849         e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 850         if (e == NULL)
 851                 return;
 852
 853         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 854         e->interrupt.closure   = client->iso_closure;
 855         e->interrupt.cycle     = cycle;
 856         e->interrupt.header_length = header_length;
 857         memcpy(e->interrupt.header, header, header_length);
 858         queue_event(client, &e->event, &e->interrupt,
 859                     sizeof(e->interrupt) + header_length, NULL, 0);
 860 }
 861
 862 static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
 863 {
 864         struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
 865         struct fw_iso_context *context;
 866
 867         /* We only support one context at this time. */
 868         if (client->iso_context != NULL)
 869                 return -EBUSY;
 870
 871         if (a->channel > 63)
 872                 return -EINVAL;
 873
 874         switch (a->type) {
 875         case FW_ISO_CONTEXT_RECEIVE:
 876                 if (a->header_size < 4 || (a->header_size & 3))
 877                         return -EINVAL;
 878                 break;
 879
 880         case FW_ISO_CONTEXT_TRANSMIT:
 881                 if (a->speed > SCODE_3200)
 882                         return -EINVAL;
 883                 break;
 884
 885         default:
 886                 return -EINVAL;
 887         }
 888
 889         context = fw_iso_context_create(client->device->card, a->type,
 890                                         a->channel, a->speed, a->header_size,
 891                                         iso_callback, client);
 892         if (IS_ERR(context))
 893                 return PTR_ERR(context);
 894
 895         client->iso_closure = a->closure;
 896         client->iso_context = context;
 897
 898         /* We only support one context at this time. */
 899         a->handle = 0;
 900
 901         return 0;
 902 }
 903
 904 /* Macros for decoding the iso packet control header. */
 905 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 906 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 907 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 908 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 909 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 910 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 911
 912 static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
 913 {
 914         struct fw_cdev_queue_iso *a = &arg->queue_iso;
 915         struct fw_cdev_iso_packet __user *p, *end, *next;
 916         struct fw_iso_context *ctx = client->iso_context;
 917         unsigned long payload, buffer_end, header_length;
 918         u32 control;
 919         int count;
 920         struct {
 921                 struct fw_iso_packet packet;
 922                 u8 header[256];
 923         } u;
 924
 925         if (ctx == NULL || a->handle != 0)
 926                 return -EINVAL;
 927
 928         /*
 929          * If the user passes a non-NULL data pointer, has mmap()'ed
 930          * the iso buffer, and the pointer points inside the buffer,
 931          * we setup the payload pointers accordingly.  Otherwise we
 932          * set them both to 0, which will still let packets with
 933          * payload_length == 0 through.  In other words, if no packets
 934          * use the indirect payload, the iso buffer need not be mapped
 935          * and the a->data pointer is ignored.
 936          */
 937
 938         payload = (unsigned long)a->data - client->vm_start;
 939         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 940         if (a->data == 0 || client->buffer.pages == NULL ||
 941             payload >= buffer_end) {
 942                 payload = 0;
 943                 buffer_end = 0;
 944         }
 945
 946         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
 947
 948         if (!access_ok(VERIFY_READ, p, a->size))
 949                 return -EFAULT;
 950
 951         end = (void __user *)p + a->size;
 952         count = 0;
 953         while (p < end) {
 954                 if (get_user(control, &p->control))
 955                         return -EFAULT;
 956                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 957                 u.packet.interrupt = GET_INTERRUPT(control);
 958                 u.packet.skip = GET_SKIP(control);
 959                 u.packet.tag = GET_TAG(control);
 960                 u.packet.sy = GET_SY(control);
 961                 u.packet.header_length = GET_HEADER_LENGTH(control);
 962
 963                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 964                         if (u.packet.header_length % 4 != 0)
 965                                 return -EINVAL;
 966                         header_length = u.packet.header_length;
 967                 } else {
 968                         /*
 969                          * We require that header_length is a multiple of
 970                          * the fixed header size, ctx->header_size.
 971                          */
 972                         if (ctx->header_size == 0) {
 973                                 if (u.packet.header_length > 0)
 974                                         return -EINVAL;
 975                         } else if (u.packet.header_length == 0 ||
 976                                    u.packet.header_length % ctx->header_size != 0) {
 977                                 return -EINVAL;
 978                         }
 979                         header_length = 0;
 980                 }
 981
 982                 next = (struct fw_cdev_iso_packet __user *)
 983                         &p->header[header_length / 4];
 984                 if (next > end)
 985                         return -EINVAL;
 986                 if (__copy_from_user
 987                     (u.packet.header, p->header, header_length))
 988                         return -EFAULT;
 989                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 990                     u.packet.header_length + u.packet.payload_length > 0)
 991                         return -EINVAL;
 992                 if (payload + u.packet.payload_length > buffer_end)
 993                         return -EINVAL;
 994
 995                 if (fw_iso_context_queue(ctx, &u.packet,
 996                                          &client->buffer, payload))
 997                         break;
 998
 999                 p = next;
1000                 payload += u.packet.payload_length;
1001                 count++;
1002         }
1003
1004         a->size    -= uptr_to_u64(p) - a->packets;
1005         a->packets  = uptr_to_u64(p);
1006         a->data     = client->vm_start + payload;
1007
1008         return count;
1009 }
1010
1011 static int ioctl_start_iso(struct client *client, union ioctl_arg *arg)
1012 {
1013         struct fw_cdev_start_iso *a = &arg->start_iso;
1014
1015         if (client->iso_context == NULL || a->handle != 0)
1016                 return -EINVAL;
1017
1018         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE &&
1019             (a->tags == 0 || a->tags > 15 || a->sync > 15))
1020                 return -EINVAL;
1021
1022         return fw_iso_context_start(client->iso_context,
1023                                     a->cycle, a->sync, a->tags);
1024 }
1025
1026 static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg)
1027 {
1028         struct fw_cdev_stop_iso *a = &arg->stop_iso;
1029
1030         if (client->iso_context == NULL || a->handle != 0)
1031                 return -EINVAL;
1032
1033         return fw_iso_context_stop(client->iso_context);
1034 }
1035
1036 static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
1037 {
1038         struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2;
1039         struct fw_card *card = client->device->card;
1040         struct timespec ts = {0, 0};
1041         u32 cycle_time;
1042         int ret = 0;
1043
1044         local_irq_disable();
1045
1046         cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME);
1047
1048         switch (a->clk_id) {
1049         case CLOCK_REALTIME:      getnstimeofday(&ts);                   break;
1050         case CLOCK_MONOTONIC:     do_posix_clock_monotonic_gettime(&ts); break;
1051         case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts);                  break;
1052         default:
1053                 ret = -EINVAL;
1054         }
1055
1056         local_irq_enable();
1057
1058         a->tv_sec      = ts.tv_sec;
1059         a->tv_nsec     = ts.tv_nsec;
1060         a->cycle_timer = cycle_time;
1061
1062         return ret;
1063 }
1064
1065 static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg)
1066 {
1067         struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer;
1068         struct fw_cdev_get_cycle_timer2 ct2;
1069
1070         ct2.clk_id = CLOCK_REALTIME;
1071         ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2);
1072
1073         a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC;
1074         a->cycle_timer = ct2.cycle_timer;
1075
1076         return 0;
1077 }
1078
1079 static void iso_resource_work(struct work_struct *work)
1080 {
1081         struct iso_resource_event *e;
1082         struct iso_resource *r =
1083                         container_of(work, struct iso_resource, work.work);
1084         struct client *client = r->client;
1085         int generation, channel, bandwidth, todo;
1086         bool skip, free, success;
1087
1088         spin_lock_irq(&client->lock);
1089         generation = client->device->generation;
1090         todo = r->todo;
1091         /* Allow 1000ms grace period for other reallocations. */
1092         if (todo == ISO_RES_ALLOC &&
1093             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1094                 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1095                 skip = true;
1096         } else {
1097                 /* We could be called twice within the same generation. */
1098                 skip = todo == ISO_RES_REALLOC &&
1099                        r->generation == generation;
1100         }
1101         free = todo == ISO_RES_DEALLOC ||
1102                todo == ISO_RES_ALLOC_ONCE ||
1103                todo == ISO_RES_DEALLOC_ONCE;
1104         r->generation = generation;
1105         spin_unlock_irq(&client->lock);
1106
1107         if (skip)
1108                 goto out;
1109
1110         bandwidth = r->bandwidth;
1111
1112         fw_iso_resource_manage(client->device->card, generation,
1113                         r->channels, &channel, &bandwidth,
1114                         todo == ISO_RES_ALLOC ||
1115                         todo == ISO_RES_REALLOC ||
1116                         todo == ISO_RES_ALLOC_ONCE,
1117                         r->transaction_data);
1118         /*
1119          * Is this generation outdated already?  As long as this resource sticks
1120          * in the idr, it will be scheduled again for a newer generation or at
1121          * shutdown.
1122          */
1123         if (channel == -EAGAIN &&
1124             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1125                 goto out;
1126
1127         success = channel >= 0 || bandwidth > 0;
1128
1129         spin_lock_irq(&client->lock);
1130         /*
1131          * Transit from allocation to reallocation, except if the client
1132          * requested deallocation in the meantime.
1133          */
1134         if (r->todo == ISO_RES_ALLOC)
1135                 r->todo = ISO_RES_REALLOC;
1136         /*
1137          * Allocation or reallocation failure?  Pull this resource out of the
1138          * idr and prepare for deletion, unless the client is shutting down.
1139          */
1140         if (r->todo == ISO_RES_REALLOC && !success &&
1141             !client->in_shutdown &&
1142             idr_find(&client->resource_idr, r->resource.handle)) {
1143                 idr_remove(&client->resource_idr, r->resource.handle);
1144                 client_put(client);
1145                 free = true;
1146         }
1147         spin_unlock_irq(&client->lock);
1148
1149         if (todo == ISO_RES_ALLOC && channel >= 0)
1150                 r->channels = 1ULL << channel;
1151
1152         if (todo == ISO_RES_REALLOC && success)
1153                 goto out;
1154
1155         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1156                 e = r->e_alloc;
1157                 r->e_alloc = NULL;
1158         } else {
1159                 e = r->e_dealloc;
1160                 r->e_dealloc = NULL;
1161         }
1162         e->iso_resource.handle    = r->resource.handle;
1163         e->iso_resource.channel   = channel;
1164         e->iso_resource.bandwidth = bandwidth;
1165
1166         queue_event(client, &e->event,
1167                     &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1168
1169         if (free) {
1170                 cancel_delayed_work(&r->work);
1171                 kfree(r->e_alloc);
1172                 kfree(r->e_dealloc);
1173                 kfree(r);
1174         }
1175  out:
1176         client_put(client);
1177 }
1178
1179 static void release_iso_resource(struct client *client,
1180                                  struct client_resource *resource)
1181 {
1182         struct iso_resource *r =
1183                 container_of(resource, struct iso_resource, resource);
1184
1185         spin_lock_irq(&client->lock);
1186         r->todo = ISO_RES_DEALLOC;
1187         schedule_iso_resource(r, 0);
1188         spin_unlock_irq(&client->lock);
1189 }
1190
1191 static int init_iso_resource(struct client *client,
1192                 struct fw_cdev_allocate_iso_resource *request, int todo)
1193 {
1194         struct iso_resource_event *e1, *e2;
1195         struct iso_resource *r;
1196         int ret;
1197
1198         if ((request->channels == 0 && request->bandwidth == 0) ||
1199             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1200             request->bandwidth < 0)
1201                 return -EINVAL;
1202
1203         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1204         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1205         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1206         if (r == NULL || e1 == NULL || e2 == NULL) {
1207                 ret = -ENOMEM;
1208                 goto fail;
1209         }
1210
1211         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1212         r->client       = client;
1213         r->todo         = todo;
1214         r->generation   = -1;
1215         r->channels     = request->channels;
1216         r->bandwidth    = request->bandwidth;
1217         r->e_alloc      = e1;
1218         r->e_dealloc    = e2;
1219
1220         e1->iso_resource.closure = request->closure;
1221         e1->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1222         e2->iso_resource.closure = request->closure;
1223         e2->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1224
1225         if (todo == ISO_RES_ALLOC) {
1226                 r->resource.release = release_iso_resource;
1227                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1228                 if (ret < 0)
1229                         goto fail;
1230         } else {
1231                 r->resource.release = NULL;
1232                 r->resource.handle = -1;
1233                 schedule_iso_resource(r, 0);
1234         }
1235         request->handle = r->resource.handle;
1236
1237         return 0;
1238  fail:
1239         kfree(r);
1240         kfree(e1);
1241         kfree(e2);
1242
1243         return ret;
1244 }
1245
1246 static int ioctl_allocate_iso_resource(struct client *client,
1247                                        union ioctl_arg *arg)
1248 {
1249         return init_iso_resource(client,
1250                         &arg->allocate_iso_resource, ISO_RES_ALLOC);
1251 }
1252
1253 static int ioctl_deallocate_iso_resource(struct client *client,
1254                                          union ioctl_arg *arg)
1255 {
1256         return release_client_resource(client,
1257                         arg->deallocate.handle, release_iso_resource, NULL);
1258 }
1259
1260 static int ioctl_allocate_iso_resource_once(struct client *client,
1261                                             union ioctl_arg *arg)
1262 {
1263         return init_iso_resource(client,
1264                         &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE);
1265 }
1266
1267 static int ioctl_deallocate_iso_resource_once(struct client *client,
1268                                               union ioctl_arg *arg)
1269 {
1270         return init_iso_resource(client,
1271                         &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE);
1272 }
1273
1274 /*
1275  * Returns a speed code:  Maximum speed to or from this device,
1276  * limited by the device's link speed, the local node's link speed,
1277  * and all PHY port speeds between the two links.
1278  */
1279 static int ioctl_get_speed(struct client *client, union ioctl_arg *arg)
1280 {
1281         return client->device->max_speed;
1282 }
1283
1284 static int ioctl_send_broadcast_request(struct client *client,
1285                                         union ioctl_arg *arg)
1286 {
1287         struct fw_cdev_send_request *a = &arg->send_request;
1288
1289         switch (a->tcode) {
1290         case TCODE_WRITE_QUADLET_REQUEST:
1291         case TCODE_WRITE_BLOCK_REQUEST:
1292                 break;
1293         default:
1294                 return -EINVAL;
1295         }
1296
1297         /* Security policy: Only allow accesses to Units Space. */
1298         if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1299                 return -EACCES;
1300
1301         return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100);
1302 }
1303
1304 static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg)
1305 {
1306         struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet;
1307         struct fw_cdev_send_request request;
1308         int dest;
1309
1310         if (a->speed > client->device->card->link_speed ||
1311             a->length > 1024 << a->speed)
1312                 return -EIO;
1313
1314         if (a->tag > 3 || a->channel > 63 || a->sy > 15)
1315                 return -EINVAL;
1316
1317         dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy);
1318         request.tcode           = TCODE_STREAM_DATA;
1319         request.length          = a->length;
1320         request.closure         = a->closure;
1321         request.data            = a->data;
1322         request.generation      = a->generation;
1323
1324         return init_request(client, &request, dest, a->speed);
1325 }
1326
1327 static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = {
1328         ioctl_get_info,
1329         ioctl_send_request,
1330         ioctl_allocate,
1331         ioctl_deallocate,
1332         ioctl_send_response,
1333         ioctl_initiate_bus_reset,
1334         ioctl_add_descriptor,
1335         ioctl_remove_descriptor,
1336         ioctl_create_iso_context,
1337         ioctl_queue_iso,
1338         ioctl_start_iso,
1339         ioctl_stop_iso,
1340         ioctl_get_cycle_timer,
1341         ioctl_allocate_iso_resource,
1342         ioctl_deallocate_iso_resource,
1343         ioctl_allocate_iso_resource_once,
1344         ioctl_deallocate_iso_resource_once,
1345         ioctl_get_speed,
1346         ioctl_send_broadcast_request,
1347         ioctl_send_stream_packet,
1348         ioctl_get_cycle_timer2,
1349 };
1350
1351 static int dispatch_ioctl(struct client *client,
1352                           unsigned int cmd, void __user *arg)
1353 {
1354         union ioctl_arg buffer;
1355         int ret;
1356
1357         if (fw_device_is_shutdown(client->device))
1358                 return -ENODEV;
1359
1360         if (_IOC_TYPE(cmd) != '#' ||
1361             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
1362             _IOC_SIZE(cmd) > sizeof(buffer))
1363                 return -EINVAL;
1364
1365         if (_IOC_DIR(cmd) == _IOC_READ)
1366                 memset(&buffer, 0, _IOC_SIZE(cmd));
1367
1368         if (_IOC_DIR(cmd) & _IOC_WRITE)
1369                 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd)))
1370                         return -EFAULT;
1371
1372         ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer);
1373         if (ret < 0)
1374                 return ret;
1375
1376         if (_IOC_DIR(cmd) & _IOC_READ)
1377                 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd)))
1378                         return -EFAULT;
1379
1380         return ret;
1381 }
1382
1383 static long fw_device_op_ioctl(struct file *file,
1384                                unsigned int cmd, unsigned long arg)
1385 {
1386         return dispatch_ioctl(file->private_data, cmd, (void __user *)arg);
1387 }
1388
1389 #ifdef CONFIG_COMPAT
1390 static long fw_device_op_compat_ioctl(struct file *file,
1391                                       unsigned int cmd, unsigned long arg)
1392 {
1393         return dispatch_ioctl(file->private_data, cmd, compat_ptr(arg));
1394 }
1395 #endif
1396
1397 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1398 {
1399         struct client *client = file->private_data;
1400         enum dma_data_direction direction;
1401         unsigned long size;
1402         int page_count, ret;
1403
1404         if (fw_device_is_shutdown(client->device))
1405                 return -ENODEV;
1406
1407         /* FIXME: We could support multiple buffers, but we don't. */
1408         if (client->buffer.pages != NULL)
1409                 return -EBUSY;
1410
1411         if (!(vma->vm_flags & VM_SHARED))
1412                 return -EINVAL;
1413
1414         if (vma->vm_start & ~PAGE_MASK)
1415                 return -EINVAL;
1416
1417         client->vm_start = vma->vm_start;
1418         size = vma->vm_end - vma->vm_start;
1419         page_count = size >> PAGE_SHIFT;
1420         if (size & ~PAGE_MASK)
1421                 return -EINVAL;
1422
1423         if (vma->vm_flags & VM_WRITE)
1424                 direction = DMA_TO_DEVICE;
1425         else
1426                 direction = DMA_FROM_DEVICE;
1427
1428         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1429                                  page_count, direction);
1430         if (ret < 0)
1431                 return ret;
1432
1433         ret = fw_iso_buffer_map(&client->buffer, vma);
1434         if (ret < 0)
1435                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1436
1437         return ret;
1438 }
1439
1440 static int shutdown_resource(int id, void *p, void *data)
1441 {
1442         struct client_resource *resource = p;
1443         struct client *client = data;
1444
1445         resource->release(client, resource);
1446         client_put(client);
1447
1448         return 0;
1449 }
1450
1451 static int fw_device_op_release(struct inode *inode, struct file *file)
1452 {
1453         struct client *client = file->private_data;
1454         struct event *event, *next_event;
1455
1456         mutex_lock(&client->device->client_list_mutex);
1457         list_del(&client->link);
1458         mutex_unlock(&client->device->client_list_mutex);
1459
1460         if (client->iso_context)
1461                 fw_iso_context_destroy(client->iso_context);
1462
1463         if (client->buffer.pages)
1464                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1465
1466         /* Freeze client->resource_idr and client->event_list */
1467         spin_lock_irq(&client->lock);
1468         client->in_shutdown = true;
1469         spin_unlock_irq(&client->lock);
1470
1471         idr_for_each(&client->resource_idr, shutdown_resource, client);
1472         idr_remove_all(&client->resource_idr);
1473         idr_destroy(&client->resource_idr);
1474
1475         list_for_each_entry_safe(event, next_event, &client->event_list, link)
1476                 kfree(event);
1477
1478         client_put(client);
1479
1480         return 0;
1481 }
1482
1483 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1484 {
1485         struct client *client = file->private_data;
1486         unsigned int mask = 0;
1487
1488         poll_wait(file, &client->wait, pt);
1489
1490         if (fw_device_is_shutdown(client->device))
1491                 mask |= POLLHUP | POLLERR;
1492         if (!list_empty(&client->event_list))
1493                 mask |= POLLIN | POLLRDNORM;
1494
1495         return mask;
1496 }
1497
1498 const struct file_operations fw_device_ops = {
1499         .owner          = THIS_MODULE,
1500         .llseek         = no_llseek,
1501         .open           = fw_device_op_open,
1502         .read           = fw_device_op_read,
1503         .unlocked_ioctl = fw_device_op_ioctl,
1504         .mmap           = fw_device_op_mmap,
1505         .release        = fw_device_op_release,
1506         .poll           = fw_device_op_poll,
1507 #ifdef CONFIG_COMPAT
1508         .compat_ioctl   = fw_device_op_compat_ioctl,
1509 #endif
1510 };