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