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