OSCL-LXR linux-6.0.1/​drivers/​firewire/​core-cdev.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Char device for device raw access
  *
  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
  */
 
 #include <linux/bug.h>
 #include <linux/compat.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/firewire.h>
 #include <linux/firewire-cdev.h>
 #include <linux/idr.h>
 #include <linux/irqflags.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/poll.h>
 #include <linux/sched.h> /* required for linux/wait.h */
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
 #include <linux/time.h>
 #include <linux/uaccess.h>
 #include <linux/vmalloc.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
 
 
 #include "core.h"
 
 /*
  * ABI version history is documented in linux/firewire-cdev.h.
  */
 #define FW_CDEV_KERNEL_VERSION          5
 #define FW_CDEV_VERSION_EVENT_REQUEST2      4
 #define FW_CDEV_VERSION_ALLOCATE_REGION_END 4
 #define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5
 
 struct client {
     u32 version;
     struct fw_device *device;
 
     spinlock_t lock;
     bool in_shutdown;
     struct idr resource_idr;
     struct list_head event_list;
     wait_queue_head_t wait;
     wait_queue_head_t tx_flush_wait;
     u64 bus_reset_closure;
 
     struct fw_iso_context *iso_context;
     u64 iso_closure;
     struct fw_iso_buffer buffer;
     unsigned long vm_start;
     bool buffer_is_mapped;
 
     struct list_head phy_receiver_link;
     u64 phy_receiver_closure;
 
     struct list_head link;
     struct kref kref;
 };
 
 static inline void client_get(struct client *client)
 {
     kref_get(&client->kref);
 }
 
 static void client_release(struct kref *kref)
 {
     struct client *client = container_of(kref, struct client, kref);
 
     fw_device_put(client->device);
     kfree(client);
 }
 
 static void client_put(struct client *client)
 {
     kref_put(&client->kref, client_release);
 }
 
 struct client_resource;
 typedef void (*client_resource_release_fn_t)(struct client *,
                          struct client_resource *);
 struct client_resource {
     client_resource_release_fn_t release;
     int handle;
 };
 
 struct address_handler_resource {
     struct client_resource resource;
     struct fw_address_handler handler;
     __u64 closure;
     struct client *client;
 };
 
 struct outbound_transaction_resource {
     struct client_resource resource;
     struct fw_transaction transaction;
 };
 
 struct inbound_transaction_resource {
     struct client_resource resource;
     struct fw_card *card;
     struct fw_request *request;
     void *data;
     size_t length;
 };
 
 struct descriptor_resource {
     struct client_resource resource;
     struct fw_descriptor descriptor;
     u32 data[];
 };
 
 struct iso_resource {
     struct client_resource resource;
     struct client *client;
     /* Schedule work and access todo only with client->lock held. */
     struct delayed_work work;
     enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
           ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
     int generation;
     u64 channels;
     s32 bandwidth;
     struct iso_resource_event *e_alloc, *e_dealloc;
 };
 
 static void release_iso_resource(struct client *, struct client_resource *);
 
 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
 {
     client_get(r->client);
     if (!queue_delayed_work(fw_workqueue, &r->work, delay))
         client_put(r->client);
 }
 
 static void schedule_if_iso_resource(struct client_resource *resource)
 {
     if (resource->release == release_iso_resource)
         schedule_iso_resource(container_of(resource,
                     struct iso_resource, resource), 0);
 }
 
 /*
  * dequeue_event() just kfree()'s the event, so the event has to be
  * the first field in a struct XYZ_event.
  */
 struct event {
     struct { void *data; size_t size; } v[2];
     struct list_head link;
 };
 
 struct bus_reset_event {
     struct event event;
     struct fw_cdev_event_bus_reset reset;
 };
 
 struct outbound_transaction_event {
     struct event event;
     struct client *client;
     struct outbound_transaction_resource r;
     struct fw_cdev_event_response response;
 };
 
 struct inbound_transaction_event {
     struct event event;
     union {
         struct fw_cdev_event_request request;
         struct fw_cdev_event_request2 request2;
     } req;
 };
 
 struct iso_interrupt_event {
     struct event event;
     struct fw_cdev_event_iso_interrupt interrupt;
 };
 
 struct iso_interrupt_mc_event {
     struct event event;
     struct fw_cdev_event_iso_interrupt_mc interrupt;
 };
 
 struct iso_resource_event {
     struct event event;
     struct fw_cdev_event_iso_resource iso_resource;
 };
 
 struct outbound_phy_packet_event {
     struct event event;
     struct client *client;
     struct fw_packet p;
     struct fw_cdev_event_phy_packet phy_packet;
 };
 
 struct inbound_phy_packet_event {
     struct event event;
     struct fw_cdev_event_phy_packet phy_packet;
 };
 
 #ifdef CONFIG_COMPAT
 static void __user *u64_to_uptr(u64 value)
 {
     if (in_compat_syscall())
         return compat_ptr(value);
     else
         return (void __user *)(unsigned long)value;
 }
 
 static u64 uptr_to_u64(void __user *ptr)
 {
     if (in_compat_syscall())
         return ptr_to_compat(ptr);
     else
         return (u64)(unsigned long)ptr;
 }
 #else
 static inline void __user *u64_to_uptr(u64 value)
 {
     return (void __user *)(unsigned long)value;
 }
 
 static inline u64 uptr_to_u64(void __user *ptr)
 {
     return (u64)(unsigned long)ptr;
 }
 #endif /* CONFIG_COMPAT */
 
 static int fw_device_op_open(struct inode *inode, struct file *file)
 {
     struct fw_device *device;
     struct client *client;
 
     device = fw_device_get_by_devt(inode->i_rdev);
     if (device == NULL)
         return -ENODEV;
 
     if (fw_device_is_shutdown(device)) {
         fw_device_put(device);
         return -ENODEV;
     }
 
     client = kzalloc(sizeof(*client), GFP_KERNEL);
     if (client == NULL) {
         fw_device_put(device);
         return -ENOMEM;
     }
 
     client->device = device;
     spin_lock_init(&client->lock);
     idr_init(&client->resource_idr);
     INIT_LIST_HEAD(&client->event_list);
     init_waitqueue_head(&client->wait);
     init_waitqueue_head(&client->tx_flush_wait);
     INIT_LIST_HEAD(&client->phy_receiver_link);
     INIT_LIST_HEAD(&client->link);
     kref_init(&client->kref);
 
     file->private_data = client;
 
     return nonseekable_open(inode, file);
 }
 
 static void queue_event(struct client *client, struct event *event,
             void *data0, size_t size0, void *data1, size_t size1)
 {
     unsigned long flags;
 
     event->v[0].data = data0;
     event->v[0].size = size0;
     event->v[1].data = data1;
     event->v[1].size = size1;
 
     spin_lock_irqsave(&client->lock, flags);
     if (client->in_shutdown)
         kfree(event);
     else
         list_add_tail(&event->link, &client->event_list);
     spin_unlock_irqrestore(&client->lock, flags);
 
     wake_up_interruptible(&client->wait);
 }
 
 static int dequeue_event(struct client *client,
              char __user *buffer, size_t count)
 {
     struct event *event;
     size_t size, total;
     int i, ret;
 
     ret = wait_event_interruptible(client->wait,
             !list_empty(&client->event_list) ||
             fw_device_is_shutdown(client->device));
     if (ret < 0)
         return ret;
 
     if (list_empty(&client->event_list) &&
                fw_device_is_shutdown(client->device))
         return -ENODEV;
 
     spin_lock_irq(&client->lock);
     event = list_first_entry(&client->event_list, struct event, link);
     list_del(&event->link);
     spin_unlock_irq(&client->lock);
 
     total = 0;
     for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
         size = min(event->v[i].size, count - total);
         if (copy_to_user(buffer + total, event->v[i].data, size)) {
             ret = -EFAULT;
             goto out;
         }
         total += size;
     }
     ret = total;
 
  out:
     kfree(event);
 
     return ret;
 }
 
 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
                  size_t count, loff_t *offset)
 {
     struct client *client = file->private_data;
 
     return dequeue_event(client, buffer, count);
 }
 
 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
                  struct client *client)
 {
     struct fw_card *card = client->device->card;
 
     spin_lock_irq(&card->lock);
 
     event->closure       = client->bus_reset_closure;
     event->type          = FW_CDEV_EVENT_BUS_RESET;
     event->generation    = client->device->generation;
     event->node_id       = client->device->node_id;
     event->local_node_id = card->local_node->node_id;
     event->bm_node_id    = card->bm_node_id;
     event->irm_node_id   = card->irm_node->node_id;
     event->root_node_id  = card->root_node->node_id;
 
     spin_unlock_irq(&card->lock);
 }
 
 static void for_each_client(struct fw_device *device,
                 void (*callback)(struct client *client))
 {
     struct client *c;
 
     mutex_lock(&device->client_list_mutex);
     list_for_each_entry(c, &device->client_list, link)
         callback(c);
     mutex_unlock(&device->client_list_mutex);
 }
 
 static int schedule_reallocations(int id, void *p, void *data)
 {
     schedule_if_iso_resource(p);
 
     return 0;
 }
 
 static void queue_bus_reset_event(struct client *client)
 {
     struct bus_reset_event *e;
 
     e = kzalloc(sizeof(*e), GFP_KERNEL);
     if (e == NULL)
         return;
 
     fill_bus_reset_event(&e->reset, client);
 
     queue_event(client, &e->event,
             &e->reset, sizeof(e->reset), NULL, 0);
 
     spin_lock_irq(&client->lock);
     idr_for_each(&client->resource_idr, schedule_reallocations, client);
     spin_unlock_irq(&client->lock);
 }
 
 void fw_device_cdev_update(struct fw_device *device)
 {
     for_each_client(device, queue_bus_reset_event);
 }
 
 static void wake_up_client(struct client *client)
 {
     wake_up_interruptible(&client->wait);
 }
 
 void fw_device_cdev_remove(struct fw_device *device)
 {
     for_each_client(device, wake_up_client);
 }
 
 union ioctl_arg {
     struct fw_cdev_get_info         get_info;
     struct fw_cdev_send_request     send_request;
     struct fw_cdev_allocate         allocate;
     struct fw_cdev_deallocate       deallocate;
     struct fw_cdev_send_response        send_response;
     struct fw_cdev_initiate_bus_reset   initiate_bus_reset;
     struct fw_cdev_add_descriptor       add_descriptor;
     struct fw_cdev_remove_descriptor    remove_descriptor;
     struct fw_cdev_create_iso_context   create_iso_context;
     struct fw_cdev_queue_iso        queue_iso;
     struct fw_cdev_start_iso        start_iso;
     struct fw_cdev_stop_iso         stop_iso;
     struct fw_cdev_get_cycle_timer      get_cycle_timer;
     struct fw_cdev_allocate_iso_resource    allocate_iso_resource;
     struct fw_cdev_send_stream_packet   send_stream_packet;
     struct fw_cdev_get_cycle_timer2     get_cycle_timer2;
     struct fw_cdev_send_phy_packet      send_phy_packet;
     struct fw_cdev_receive_phy_packets  receive_phy_packets;
     struct fw_cdev_set_iso_channels     set_iso_channels;
     struct fw_cdev_flush_iso        flush_iso;
 };
 
 static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_get_info *a = &arg->get_info;
     struct fw_cdev_event_bus_reset bus_reset;
     unsigned long ret = 0;
 
     client->version = a->version;
     a->version = FW_CDEV_KERNEL_VERSION;
     a->card = client->device->card->index;
 
     down_read(&fw_device_rwsem);
 
     if (a->rom != 0) {
         size_t want = a->rom_length;
         size_t have = client->device->config_rom_length * 4;
 
         ret = copy_to_user(u64_to_uptr(a->rom),
                    client->device->config_rom, min(want, have));
     }
     a->rom_length = client->device->config_rom_length * 4;
 
     up_read(&fw_device_rwsem);
 
     if (ret != 0)
         return -EFAULT;
 
     mutex_lock(&client->device->client_list_mutex);
 
     client->bus_reset_closure = a->bus_reset_closure;
     if (a->bus_reset != 0) {
         fill_bus_reset_event(&bus_reset, client);
         /* unaligned size of bus_reset is 36 bytes */
         ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36);
     }
     if (ret == 0 && list_empty(&client->link))
         list_add_tail(&client->link, &client->device->client_list);
 
     mutex_unlock(&client->device->client_list_mutex);
 
     return ret ? -EFAULT : 0;
 }
 
 static int add_client_resource(struct client *client,
                    struct client_resource *resource, gfp_t gfp_mask)
 {
     bool preload = gfpflags_allow_blocking(gfp_mask);
     unsigned long flags;
     int ret;
 
     if (preload)
         idr_preload(gfp_mask);
     spin_lock_irqsave(&client->lock, flags);
 
     if (client->in_shutdown)
         ret = -ECANCELED;
     else
         ret = idr_alloc(&client->resource_idr, resource, 0, 0,
                 GFP_NOWAIT);
     if (ret >= 0) {
         resource->handle = ret;
         client_get(client);
         schedule_if_iso_resource(resource);
     }
 
     spin_unlock_irqrestore(&client->lock, flags);
     if (preload)
         idr_preload_end();
 
     return ret < 0 ? ret : 0;
 }
 
 static int release_client_resource(struct client *client, u32 handle,
                    client_resource_release_fn_t release,
                    struct client_resource **return_resource)
 {
     struct client_resource *resource;
 
     spin_lock_irq(&client->lock);
     if (client->in_shutdown)
         resource = NULL;
     else
         resource = idr_find(&client->resource_idr, handle);
     if (resource && resource->release == release)
         idr_remove(&client->resource_idr, handle);
     spin_unlock_irq(&client->lock);
 
     if (!(resource && resource->release == release))
         return -EINVAL;
 
     if (return_resource)
         *return_resource = resource;
     else
         resource->release(client, resource);
 
     client_put(client);
 
     return 0;
 }
 
 static void release_transaction(struct client *client,
                 struct client_resource *resource)
 {
 }
 
 static void complete_transaction(struct fw_card *card, int rcode,
                  void *payload, size_t length, void *data)
 {
     struct outbound_transaction_event *e = data;
     struct fw_cdev_event_response *rsp = &e->response;
     struct client *client = e->client;
     unsigned long flags;
 
     if (length < rsp->length)
         rsp->length = length;
     if (rcode == RCODE_COMPLETE)
         memcpy(rsp->data, payload, rsp->length);
 
     spin_lock_irqsave(&client->lock, flags);
     idr_remove(&client->resource_idr, e->r.resource.handle);
     if (client->in_shutdown)
         wake_up(&client->tx_flush_wait);
     spin_unlock_irqrestore(&client->lock, flags);
 
     rsp->type = FW_CDEV_EVENT_RESPONSE;
     rsp->rcode = rcode;
 
     /*
      * In the case that sizeof(*rsp) doesn't align with the position of the
      * data, and the read is short, preserve an extra copy of the data
      * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
      * for short reads and some apps depended on it, this is both safe
      * and prudent for compatibility.
      */
     if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
         queue_event(client, &e->event, rsp, sizeof(*rsp),
                 rsp->data, rsp->length);
     else
         queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
                 NULL, 0);
 
     /* Drop the idr's reference */
     client_put(client);
 }
 
 static int init_request(struct client *client,
             struct fw_cdev_send_request *request,
             int destination_id, int speed)
 {
     struct outbound_transaction_event *e;
     int ret;
 
     if (request->tcode != TCODE_STREAM_DATA &&
         (request->length > 4096 || request->length > 512 << speed))
         return -EIO;
 
     if (request->tcode == TCODE_WRITE_QUADLET_REQUEST &&
         request->length < 4)
         return -EINVAL;
 
     e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
     if (e == NULL)
         return -ENOMEM;
 
     e->client = client;
     e->response.length = request->length;
     e->response.closure = request->closure;
 
     if (request->data &&
         copy_from_user(e->response.data,
                u64_to_uptr(request->data), request->length)) {
         ret = -EFAULT;
         goto failed;
     }
 
     e->r.resource.release = release_transaction;
     ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
     if (ret < 0)
         goto failed;
 
     fw_send_request(client->device->card, &e->r.transaction,
             request->tcode, destination_id, request->generation,
             speed, request->offset, e->response.data,
             request->length, complete_transaction, e);
     return 0;
 
  failed:
     kfree(e);
 
     return ret;
 }
 
 static int ioctl_send_request(struct client *client, union ioctl_arg *arg)
 {
     switch (arg->send_request.tcode) {
     case TCODE_WRITE_QUADLET_REQUEST:
     case TCODE_WRITE_BLOCK_REQUEST:
     case TCODE_READ_QUADLET_REQUEST:
     case TCODE_READ_BLOCK_REQUEST:
     case TCODE_LOCK_MASK_SWAP:
     case TCODE_LOCK_COMPARE_SWAP:
     case TCODE_LOCK_FETCH_ADD:
     case TCODE_LOCK_LITTLE_ADD:
     case TCODE_LOCK_BOUNDED_ADD:
     case TCODE_LOCK_WRAP_ADD:
     case TCODE_LOCK_VENDOR_DEPENDENT:
         break;
     default:
         return -EINVAL;
     }
 
     return init_request(client, &arg->send_request, client->device->node_id,
                 client->device->max_speed);
 }
 
 static inline bool is_fcp_request(struct fw_request *request)
 {
     return request == NULL;
 }
 
 static void release_request(struct client *client,
                 struct client_resource *resource)
 {
     struct inbound_transaction_resource *r = container_of(resource,
             struct inbound_transaction_resource, resource);
 
     if (is_fcp_request(r->request))
         kfree(r->data);
     else
         fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR);
 
     fw_card_put(r->card);
     kfree(r);
 }
 
 static void handle_request(struct fw_card *card, struct fw_request *request,
                int tcode, int destination, int source,
                int generation, unsigned long long offset,
                void *payload, size_t length, void *callback_data)
 {
     struct address_handler_resource *handler = callback_data;
     struct inbound_transaction_resource *r;
     struct inbound_transaction_event *e;
     size_t event_size0;
     void *fcp_frame = NULL;
     int ret;
 
     /* card may be different from handler->client->device->card */
     fw_card_get(card);
 
     r = kmalloc(sizeof(*r), GFP_ATOMIC);
     e = kmalloc(sizeof(*e), GFP_ATOMIC);
     if (r == NULL || e == NULL)
         goto failed;
 
     r->card    = card;
     r->request = request;
     r->data    = payload;
     r->length  = length;
 
     if (is_fcp_request(request)) {
         /*
          * FIXME: Let core-transaction.c manage a
          * single reference-counted copy?
          */
         fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
         if (fcp_frame == NULL)
             goto failed;
 
         r->data = fcp_frame;
     }
 
     r->resource.release = release_request;
     ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
     if (ret < 0)
         goto failed;
 
     if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) {
         struct fw_cdev_event_request *req = &e->req.request;
 
         if (tcode & 0x10)
             tcode = TCODE_LOCK_REQUEST;
 
         req->type   = FW_CDEV_EVENT_REQUEST;
         req->tcode  = tcode;
         req->offset = offset;
         req->length = length;
         req->handle = r->resource.handle;
         req->closure    = handler->closure;
         event_size0 = sizeof(*req);
     } else {
         struct fw_cdev_event_request2 *req = &e->req.request2;
 
         req->type   = FW_CDEV_EVENT_REQUEST2;
         req->tcode  = tcode;
         req->offset = offset;
         req->source_node_id = source;
         req->destination_node_id = destination;
         req->card   = card->index;
         req->generation = generation;
         req->length = length;
         req->handle = r->resource.handle;
         req->closure    = handler->closure;
         event_size0 = sizeof(*req);
     }
 
     queue_event(handler->client, &e->event,
             &e->req, event_size0, r->data, length);
     return;
 
  failed:
     kfree(r);
     kfree(e);
     kfree(fcp_frame);
 
     if (!is_fcp_request(request))
         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 
     fw_card_put(card);
 }
 
 static void release_address_handler(struct client *client,
                     struct client_resource *resource)
 {
     struct address_handler_resource *r =
         container_of(resource, struct address_handler_resource, resource);
 
     fw_core_remove_address_handler(&r->handler);
     kfree(r);
 }
 
 static int ioctl_allocate(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_allocate *a = &arg->allocate;
     struct address_handler_resource *r;
     struct fw_address_region region;
     int ret;
 
     r = kmalloc(sizeof(*r), GFP_KERNEL);
     if (r == NULL)
         return -ENOMEM;
 
     region.start = a->offset;
     if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END)
         region.end = a->offset + a->length;
     else
         region.end = a->region_end;
 
     r->handler.length           = a->length;
     r->handler.address_callback = handle_request;
     r->handler.callback_data    = r;
     r->closure   = a->closure;
     r->client    = client;
 
     ret = fw_core_add_address_handler(&r->handler, &region);
     if (ret < 0) {
         kfree(r);
         return ret;
     }
     a->offset = r->handler.offset;
 
     r->resource.release = release_address_handler;
     ret = add_client_resource(client, &r->resource, GFP_KERNEL);
     if (ret < 0) {
         release_address_handler(client, &r->resource);
         return ret;
     }
     a->handle = r->resource.handle;
 
     return 0;
 }
 
 static int ioctl_deallocate(struct client *client, union ioctl_arg *arg)
 {
     return release_client_resource(client, arg->deallocate.handle,
                        release_address_handler, NULL);
 }
 
 static int ioctl_send_response(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_send_response *a = &arg->send_response;
     struct client_resource *resource;
     struct inbound_transaction_resource *r;
     int ret = 0;
 
     if (release_client_resource(client, a->handle,
                     release_request, &resource) < 0)
         return -EINVAL;
 
     r = container_of(resource, struct inbound_transaction_resource,
              resource);
     if (is_fcp_request(r->request))
         goto out;
 
     if (a->length != fw_get_response_length(r->request)) {
         ret = -EINVAL;
         kfree(r->request);
         goto out;
     }
     if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) {
         ret = -EFAULT;
         kfree(r->request);
         goto out;
     }
     fw_send_response(r->card, r->request, a->rcode);
  out:
     fw_card_put(r->card);
     kfree(r);
 
     return ret;
 }
 
 static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg)
 {
     fw_schedule_bus_reset(client->device->card, true,
             arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET);
     return 0;
 }
 
 static void release_descriptor(struct client *client,
                    struct client_resource *resource)
 {
     struct descriptor_resource *r =
         container_of(resource, struct descriptor_resource, resource);
 
     fw_core_remove_descriptor(&r->descriptor);
     kfree(r);
 }
 
 static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_add_descriptor *a = &arg->add_descriptor;
     struct descriptor_resource *r;
     int ret;
 
     /* Access policy: Allow this ioctl only on local nodes' device files. */
     if (!client->device->is_local)
         return -ENOSYS;
 
     if (a->length > 256)
         return -EINVAL;
 
     r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL);
     if (r == NULL)
         return -ENOMEM;
 
     if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) {
         ret = -EFAULT;
         goto failed;
     }
 
     r->descriptor.length    = a->length;
     r->descriptor.immediate = a->immediate;
     r->descriptor.key       = a->key;
     r->descriptor.data      = r->data;
 
     ret = fw_core_add_descriptor(&r->descriptor);
     if (ret < 0)
         goto failed;
 
     r->resource.release = release_descriptor;
     ret = add_client_resource(client, &r->resource, GFP_KERNEL);
     if (ret < 0) {
         fw_core_remove_descriptor(&r->descriptor);
         goto failed;
     }
     a->handle = r->resource.handle;
 
     return 0;
  failed:
     kfree(r);
 
     return ret;
 }
 
 static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg)
 {
     return release_client_resource(client, arg->remove_descriptor.handle,
                        release_descriptor, NULL);
 }
 
 static void iso_callback(struct fw_iso_context *context, u32 cycle,
              size_t header_length, void *header, void *data)
 {
     struct client *client = data;
     struct iso_interrupt_event *e;
 
     e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC);
     if (e == NULL)
         return;
 
     e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
     e->interrupt.closure   = client->iso_closure;
     e->interrupt.cycle     = cycle;
     e->interrupt.header_length = header_length;
     memcpy(e->interrupt.header, header, header_length);
     queue_event(client, &e->event, &e->interrupt,
             sizeof(e->interrupt) + header_length, NULL, 0);
 }
 
 static void iso_mc_callback(struct fw_iso_context *context,
                 dma_addr_t completed, void *data)
 {
     struct client *client = data;
     struct iso_interrupt_mc_event *e;
 
     e = kmalloc(sizeof(*e), GFP_ATOMIC);
     if (e == NULL)
         return;
 
     e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL;
     e->interrupt.closure   = client->iso_closure;
     e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer,
                               completed);
     queue_event(client, &e->event, &e->interrupt,
             sizeof(e->interrupt), NULL, 0);
 }
 
 static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context)
 {
         if (context->type == FW_ISO_CONTEXT_TRANSMIT)
             return DMA_TO_DEVICE;
         else
             return DMA_FROM_DEVICE;
 }
 
 static struct fw_iso_context *fw_iso_mc_context_create(struct fw_card *card,
                         fw_iso_mc_callback_t callback,
                         void *callback_data)
 {
     struct fw_iso_context *ctx;
 
     ctx = fw_iso_context_create(card, FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL,
                     0, 0, 0, NULL, callback_data);
     if (!IS_ERR(ctx))
         ctx->callback.mc = callback;
 
     return ctx;
 }
 
 static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
     struct fw_iso_context *context;
     union fw_iso_callback cb;
     int ret;
 
     BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
              FW_CDEV_ISO_CONTEXT_RECEIVE  != FW_ISO_CONTEXT_RECEIVE  ||
              FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL !=
                     FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL);
 
     switch (a->type) {
     case FW_ISO_CONTEXT_TRANSMIT:
         if (a->speed > SCODE_3200 || a->channel > 63)
             return -EINVAL;
 
         cb.sc = iso_callback;
         break;
 
     case FW_ISO_CONTEXT_RECEIVE:
         if (a->header_size < 4 || (a->header_size & 3) ||
             a->channel > 63)
             return -EINVAL;
 
         cb.sc = iso_callback;
         break;
 
     case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
         cb.mc = iso_mc_callback;
         break;
 
     default:
         return -EINVAL;
     }
 
     if (a->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
         context = fw_iso_mc_context_create(client->device->card, cb.mc,
                            client);
     else
         context = fw_iso_context_create(client->device->card, a->type,
                         a->channel, a->speed,
                         a->header_size, cb.sc, client);
     if (IS_ERR(context))
         return PTR_ERR(context);
     if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW)
         context->drop_overflow_headers = true;
 
     /* We only support one context at this time. */
     spin_lock_irq(&client->lock);
     if (client->iso_context != NULL) {
         spin_unlock_irq(&client->lock);
         fw_iso_context_destroy(context);
 
         return -EBUSY;
     }
     if (!client->buffer_is_mapped) {
         ret = fw_iso_buffer_map_dma(&client->buffer,
                         client->device->card,
                         iso_dma_direction(context));
         if (ret < 0) {
             spin_unlock_irq(&client->lock);
             fw_iso_context_destroy(context);
 
             return ret;
         }
         client->buffer_is_mapped = true;
     }
     client->iso_closure = a->closure;
     client->iso_context = context;
     spin_unlock_irq(&client->lock);
 
     a->handle = 0;
 
     return 0;
 }
 
 static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels;
     struct fw_iso_context *ctx = client->iso_context;
 
     if (ctx == NULL || a->handle != 0)
         return -EINVAL;
 
     return fw_iso_context_set_channels(ctx, &a->channels);
 }
 
 /* Macros for decoding the iso packet control header. */
 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 #define GET_INTERRUPT(v)    (((v) >> 16) & 0x01)
 #define GET_SKIP(v)     (((v) >> 17) & 0x01)
 #define GET_TAG(v)      (((v) >> 18) & 0x03)
 #define GET_SY(v)       (((v) >> 20) & 0x0f)
 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 
 static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_queue_iso *a = &arg->queue_iso;
     struct fw_cdev_iso_packet __user *p, *end, *next;
     struct fw_iso_context *ctx = client->iso_context;
     unsigned long payload, buffer_end, transmit_header_bytes = 0;
     u32 control;
     int count;
     struct {
         struct fw_iso_packet packet;
         u8 header[256];
     } u;
 
     if (ctx == NULL || a->handle != 0)
         return -EINVAL;
 
     /*
      * If the user passes a non-NULL data pointer, has mmap()'ed
      * the iso buffer, and the pointer points inside the buffer,
      * we setup the payload pointers accordingly.  Otherwise we
      * set them both to 0, which will still let packets with
      * payload_length == 0 through.  In other words, if no packets
      * use the indirect payload, the iso buffer need not be mapped
      * and the a->data pointer is ignored.
      */
     payload = (unsigned long)a->data - client->vm_start;
     buffer_end = client->buffer.page_count << PAGE_SHIFT;
     if (a->data == 0 || client->buffer.pages == NULL ||
         payload >= buffer_end) {
         payload = 0;
         buffer_end = 0;
     }
 
     if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3)
         return -EINVAL;
 
     p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
 
     end = (void __user *)p + a->size;
     count = 0;
     while (p < end) {
         if (get_user(control, &p->control))
             return -EFAULT;
         u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
         u.packet.interrupt = GET_INTERRUPT(control);
         u.packet.skip = GET_SKIP(control);
         u.packet.tag = GET_TAG(control);
         u.packet.sy = GET_SY(control);
         u.packet.header_length = GET_HEADER_LENGTH(control);
 
         switch (ctx->type) {
         case FW_ISO_CONTEXT_TRANSMIT:
             if (u.packet.header_length & 3)
                 return -EINVAL;
             transmit_header_bytes = u.packet.header_length;
             break;
 
         case FW_ISO_CONTEXT_RECEIVE:
             if (u.packet.header_length == 0 ||
                 u.packet.header_length % ctx->header_size != 0)
                 return -EINVAL;
             break;
 
         case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
             if (u.packet.payload_length == 0 ||
                 u.packet.payload_length & 3)
                 return -EINVAL;
             break;
         }
 
         next = (struct fw_cdev_iso_packet __user *)
             &p->header[transmit_header_bytes / 4];
         if (next > end)
             return -EINVAL;
         if (copy_from_user
             (u.packet.header, p->header, transmit_header_bytes))
             return -EFAULT;
         if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
             u.packet.header_length + u.packet.payload_length > 0)
             return -EINVAL;
         if (payload + u.packet.payload_length > buffer_end)
             return -EINVAL;
 
         if (fw_iso_context_queue(ctx, &u.packet,
                      &client->buffer, payload))
             break;
 
         p = next;
         payload += u.packet.payload_length;
         count++;
     }
     fw_iso_context_queue_flush(ctx);
 
     a->size    -= uptr_to_u64(p) - a->packets;
     a->packets  = uptr_to_u64(p);
     a->data     = client->vm_start + payload;
 
     return count;
 }
 
 static int ioctl_start_iso(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_start_iso *a = &arg->start_iso;
 
     BUILD_BUG_ON(
         FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 ||
         FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 ||
         FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 ||
         FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 ||
         FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS);
 
     if (client->iso_context == NULL || a->handle != 0)
         return -EINVAL;
 
     if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE &&
         (a->tags == 0 || a->tags > 15 || a->sync > 15))
         return -EINVAL;
 
     return fw_iso_context_start(client->iso_context,
                     a->cycle, a->sync, a->tags);
 }
 
 static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_stop_iso *a = &arg->stop_iso;
 
     if (client->iso_context == NULL || a->handle != 0)
         return -EINVAL;
 
     return fw_iso_context_stop(client->iso_context);
 }
 
 static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_flush_iso *a = &arg->flush_iso;
 
     if (client->iso_context == NULL || a->handle != 0)
         return -EINVAL;
 
     return fw_iso_context_flush_completions(client->iso_context);
 }
 
 static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2;
     struct fw_card *card = client->device->card;
     struct timespec64 ts = {0, 0};
     u32 cycle_time = 0;
     int ret = 0;
 
     local_irq_disable();
 
     ret = fw_card_read_cycle_time(card, &cycle_time);
     if (ret < 0)
         goto end;
 
     switch (a->clk_id) {
     case CLOCK_REALTIME:      ktime_get_real_ts64(&ts); break;
     case CLOCK_MONOTONIC:     ktime_get_ts64(&ts);      break;
     case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts);  break;
     default:
         ret = -EINVAL;
     }
 end:
     local_irq_enable();
 
     a->tv_sec      = ts.tv_sec;
     a->tv_nsec     = ts.tv_nsec;
     a->cycle_timer = cycle_time;
 
     return ret;
 }
 
 static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer;
     struct fw_cdev_get_cycle_timer2 ct2;
 
     ct2.clk_id = CLOCK_REALTIME;
     ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2);
 
     a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC;
     a->cycle_timer = ct2.cycle_timer;
 
     return 0;
 }
 
 static void iso_resource_work(struct work_struct *work)
 {
     struct iso_resource_event *e;
     struct iso_resource *r =
             container_of(work, struct iso_resource, work.work);
     struct client *client = r->client;
     int generation, channel, bandwidth, todo;
     bool skip, free, success;
 
     spin_lock_irq(&client->lock);
     generation = client->device->generation;
     todo = r->todo;
     /* Allow 1000ms grace period for other reallocations. */
     if (todo == ISO_RES_ALLOC &&
         time_before64(get_jiffies_64(),
               client->device->card->reset_jiffies + HZ)) {
         schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
         skip = true;
     } else {
         /* We could be called twice within the same generation. */
         skip = todo == ISO_RES_REALLOC &&
                r->generation == generation;
     }
     free = todo == ISO_RES_DEALLOC ||
            todo == ISO_RES_ALLOC_ONCE ||
            todo == ISO_RES_DEALLOC_ONCE;
     r->generation = generation;
     spin_unlock_irq(&client->lock);
 
     if (skip)
         goto out;
 
     bandwidth = r->bandwidth;
 
     fw_iso_resource_manage(client->device->card, generation,
             r->channels, &channel, &bandwidth,
             todo == ISO_RES_ALLOC ||
             todo == ISO_RES_REALLOC ||
             todo == ISO_RES_ALLOC_ONCE);
     /*
      * Is this generation outdated already?  As long as this resource sticks
      * in the idr, it will be scheduled again for a newer generation or at
      * shutdown.
      */
     if (channel == -EAGAIN &&
         (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
         goto out;
 
     success = channel >= 0 || bandwidth > 0;
 
     spin_lock_irq(&client->lock);
     /*
      * Transit from allocation to reallocation, except if the client
      * requested deallocation in the meantime.
      */
     if (r->todo == ISO_RES_ALLOC)
         r->todo = ISO_RES_REALLOC;
     /*
      * Allocation or reallocation failure?  Pull this resource out of the
      * idr and prepare for deletion, unless the client is shutting down.
      */
     if (r->todo == ISO_RES_REALLOC && !success &&
         !client->in_shutdown &&
         idr_remove(&client->resource_idr, r->resource.handle)) {
         client_put(client);
         free = true;
     }
     spin_unlock_irq(&client->lock);
 
     if (todo == ISO_RES_ALLOC && channel >= 0)
         r->channels = 1ULL << channel;
 
     if (todo == ISO_RES_REALLOC && success)
         goto out;
 
     if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
         e = r->e_alloc;
         r->e_alloc = NULL;
     } else {
         e = r->e_dealloc;
         r->e_dealloc = NULL;
     }
     e->iso_resource.handle    = r->resource.handle;
     e->iso_resource.channel   = channel;
     e->iso_resource.bandwidth = bandwidth;
 
     queue_event(client, &e->event,
             &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
 
     if (free) {
         cancel_delayed_work(&r->work);
         kfree(r->e_alloc);
         kfree(r->e_dealloc);
         kfree(r);
     }
  out:
     client_put(client);
 }
 
 static void release_iso_resource(struct client *client,
                  struct client_resource *resource)
 {
     struct iso_resource *r =
         container_of(resource, struct iso_resource, resource);
 
     spin_lock_irq(&client->lock);
     r->todo = ISO_RES_DEALLOC;
     schedule_iso_resource(r, 0);
     spin_unlock_irq(&client->lock);
 }
 
 static int init_iso_resource(struct client *client,
         struct fw_cdev_allocate_iso_resource *request, int todo)
 {
     struct iso_resource_event *e1, *e2;
     struct iso_resource *r;
     int ret;
 
     if ((request->channels == 0 && request->bandwidth == 0) ||
         request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL)
         return -EINVAL;
 
     r  = kmalloc(sizeof(*r), GFP_KERNEL);
     e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
     e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
     if (r == NULL || e1 == NULL || e2 == NULL) {
         ret = -ENOMEM;
         goto fail;
     }
 
     INIT_DELAYED_WORK(&r->work, iso_resource_work);
     r->client   = client;
     r->todo     = todo;
     r->generation   = -1;
     r->channels = request->channels;
     r->bandwidth    = request->bandwidth;
     r->e_alloc  = e1;
     r->e_dealloc    = e2;
 
     e1->iso_resource.closure = request->closure;
     e1->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
     e2->iso_resource.closure = request->closure;
     e2->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
 
     if (todo == ISO_RES_ALLOC) {
         r->resource.release = release_iso_resource;
         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
         if (ret < 0)
             goto fail;
     } else {
         r->resource.release = NULL;
         r->resource.handle = -1;
         schedule_iso_resource(r, 0);
     }
     request->handle = r->resource.handle;
 
     return 0;
  fail:
     kfree(r);
     kfree(e1);
     kfree(e2);
 
     return ret;
 }
 
 static int ioctl_allocate_iso_resource(struct client *client,
                        union ioctl_arg *arg)
 {
     return init_iso_resource(client,
             &arg->allocate_iso_resource, ISO_RES_ALLOC);
 }
 
 static int ioctl_deallocate_iso_resource(struct client *client,
                      union ioctl_arg *arg)
 {
     return release_client_resource(client,
             arg->deallocate.handle, release_iso_resource, NULL);
 }
 
 static int ioctl_allocate_iso_resource_once(struct client *client,
                         union ioctl_arg *arg)
 {
     return init_iso_resource(client,
             &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE);
 }
 
 static int ioctl_deallocate_iso_resource_once(struct client *client,
                           union ioctl_arg *arg)
 {
     return init_iso_resource(client,
             &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE);
 }
 
 /*
  * Returns a speed code:  Maximum speed to or from this device,
  * limited by the device's link speed, the local node's link speed,
  * and all PHY port speeds between the two links.
  */
 static int ioctl_get_speed(struct client *client, union ioctl_arg *arg)
 {
     return client->device->max_speed;
 }
 
 static int ioctl_send_broadcast_request(struct client *client,
                     union ioctl_arg *arg)
 {
     struct fw_cdev_send_request *a = &arg->send_request;
 
     switch (a->tcode) {
     case TCODE_WRITE_QUADLET_REQUEST:
     case TCODE_WRITE_BLOCK_REQUEST:
         break;
     default:
         return -EINVAL;
     }
 
     /* Security policy: Only allow accesses to Units Space. */
     if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
         return -EACCES;
 
     return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100);
 }
 
 static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet;
     struct fw_cdev_send_request request;
     int dest;
 
     if (a->speed > client->device->card->link_speed ||
         a->length > 1024 << a->speed)
         return -EIO;
 
     if (a->tag > 3 || a->channel > 63 || a->sy > 15)
         return -EINVAL;
 
     dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy);
     request.tcode       = TCODE_STREAM_DATA;
     request.length      = a->length;
     request.closure     = a->closure;
     request.data        = a->data;
     request.generation  = a->generation;
 
     return init_request(client, &request, dest, a->speed);
 }
 
 static void outbound_phy_packet_callback(struct fw_packet *packet,
                      struct fw_card *card, int status)
 {
     struct outbound_phy_packet_event *e =
         container_of(packet, struct outbound_phy_packet_event, p);
     struct client *e_client;
 
     switch (status) {
     /* expected: */
     case ACK_COMPLETE:  e->phy_packet.rcode = RCODE_COMPLETE;   break;
     /* should never happen with PHY packets: */
     case ACK_PENDING:   e->phy_packet.rcode = RCODE_COMPLETE;   break;
     case ACK_BUSY_X:
     case ACK_BUSY_A:
     case ACK_BUSY_B:    e->phy_packet.rcode = RCODE_BUSY;   break;
     case ACK_DATA_ERROR:    e->phy_packet.rcode = RCODE_DATA_ERROR; break;
     case ACK_TYPE_ERROR:    e->phy_packet.rcode = RCODE_TYPE_ERROR; break;
     /* stale generation; cancelled; on certain controllers: no ack */
     default:        e->phy_packet.rcode = status;       break;
     }
     e->phy_packet.data[0] = packet->timestamp;
 
     e_client = e->client;
     queue_event(e->client, &e->event, &e->phy_packet,
             sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0);
     client_put(e_client);
 }
 
 static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet;
     struct fw_card *card = client->device->card;
     struct outbound_phy_packet_event *e;
 
     /* Access policy: Allow this ioctl only on local nodes' device files. */
     if (!client->device->is_local)
         return -ENOSYS;
 
     e = kzalloc(sizeof(*e) + 4, GFP_KERNEL);
     if (e == NULL)
         return -ENOMEM;
 
     client_get(client);
     e->client       = client;
     e->p.speed      = SCODE_100;
     e->p.generation     = a->generation;
     e->p.header[0]      = TCODE_LINK_INTERNAL << 4;
     e->p.header[1]      = a->data[0];
     e->p.header[2]      = a->data[1];
     e->p.header_length  = 12;
     e->p.callback       = outbound_phy_packet_callback;
     e->phy_packet.closure   = a->closure;
     e->phy_packet.type  = FW_CDEV_EVENT_PHY_PACKET_SENT;
     if (is_ping_packet(a->data))
             e->phy_packet.length = 4;
 
     card->driver->send_request(card, &e->p);
 
     return 0;
 }
 
 static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg)
 {
     struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets;
     struct fw_card *card = client->device->card;
 
     /* Access policy: Allow this ioctl only on local nodes' device files. */
     if (!client->device->is_local)
         return -ENOSYS;
 
     spin_lock_irq(&card->lock);
 
     list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list);
     client->phy_receiver_closure = a->closure;
 
     spin_unlock_irq(&card->lock);
 
     return 0;
 }
 
 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p)
 {
     struct client *client;
     struct inbound_phy_packet_event *e;
     unsigned long flags;
 
     spin_lock_irqsave(&card->lock, flags);
 
     list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) {
         e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC);
         if (e == NULL)
             break;
 
         e->phy_packet.closure   = client->phy_receiver_closure;
         e->phy_packet.type  = FW_CDEV_EVENT_PHY_PACKET_RECEIVED;
         e->phy_packet.rcode = RCODE_COMPLETE;
         e->phy_packet.length    = 8;
         e->phy_packet.data[0]   = p->header[1];
         e->phy_packet.data[1]   = p->header[2];
         queue_event(client, &e->event,
                 &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0);
     }
 
     spin_unlock_irqrestore(&card->lock, flags);
 }
 
 static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = {
     [0x00] = ioctl_get_info,
     [0x01] = ioctl_send_request,
     [0x02] = ioctl_allocate,
     [0x03] = ioctl_deallocate,
     [0x04] = ioctl_send_response,
     [0x05] = ioctl_initiate_bus_reset,
     [0x06] = ioctl_add_descriptor,
     [0x07] = ioctl_remove_descriptor,
     [0x08] = ioctl_create_iso_context,
     [0x09] = ioctl_queue_iso,
     [0x0a] = ioctl_start_iso,
     [0x0b] = ioctl_stop_iso,
     [0x0c] = ioctl_get_cycle_timer,
     [0x0d] = ioctl_allocate_iso_resource,
     [0x0e] = ioctl_deallocate_iso_resource,
     [0x0f] = ioctl_allocate_iso_resource_once,
     [0x10] = ioctl_deallocate_iso_resource_once,
     [0x11] = ioctl_get_speed,
     [0x12] = ioctl_send_broadcast_request,
     [0x13] = ioctl_send_stream_packet,
     [0x14] = ioctl_get_cycle_timer2,
     [0x15] = ioctl_send_phy_packet,
     [0x16] = ioctl_receive_phy_packets,
     [0x17] = ioctl_set_iso_channels,
     [0x18] = ioctl_flush_iso,
 };
 
 static int dispatch_ioctl(struct client *client,
               unsigned int cmd, void __user *arg)
 {
     union ioctl_arg buffer;
     int ret;
 
     if (fw_device_is_shutdown(client->device))
         return -ENODEV;
 
     if (_IOC_TYPE(cmd) != '#' ||
         _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
         _IOC_SIZE(cmd) > sizeof(buffer))
         return -ENOTTY;
 
     memset(&buffer, 0, sizeof(buffer));
 
     if (_IOC_DIR(cmd) & _IOC_WRITE)
         if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd)))
             return -EFAULT;
 
     ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer);
     if (ret < 0)
         return ret;
 
     if (_IOC_DIR(cmd) & _IOC_READ)
         if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd)))
             return -EFAULT;
 
     return ret;
 }
 
 static long fw_device_op_ioctl(struct file *file,
                    unsigned int cmd, unsigned long arg)
 {
     return dispatch_ioctl(file->private_data, cmd, (void __user *)arg);
 }
 
 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 {
     struct client *client = file->private_data;
     unsigned long size;
     int page_count, ret;
 
     if (fw_device_is_shutdown(client->device))
         return -ENODEV;
 
     /* FIXME: We could support multiple buffers, but we don't. */
     if (client->buffer.pages != NULL)
         return -EBUSY;
 
     if (!(vma->vm_flags & VM_SHARED))
         return -EINVAL;
 
     if (vma->vm_start & ~PAGE_MASK)
         return -EINVAL;
 
     client->vm_start = vma->vm_start;
     size = vma->vm_end - vma->vm_start;
     page_count = size >> PAGE_SHIFT;
     if (size & ~PAGE_MASK)
         return -EINVAL;
 
     ret = fw_iso_buffer_alloc(&client->buffer, page_count);
     if (ret < 0)
         return ret;
 
     spin_lock_irq(&client->lock);
     if (client->iso_context) {
         ret = fw_iso_buffer_map_dma(&client->buffer,
                 client->device->card,
                 iso_dma_direction(client->iso_context));
         client->buffer_is_mapped = (ret == 0);
     }
     spin_unlock_irq(&client->lock);
     if (ret < 0)
         goto fail;
 
     ret = vm_map_pages_zero(vma, client->buffer.pages,
                 client->buffer.page_count);
     if (ret < 0)
         goto fail;
 
     return 0;
  fail:
     fw_iso_buffer_destroy(&client->buffer, client->device->card);
     return ret;
 }
 
 static int is_outbound_transaction_resource(int id, void *p, void *data)
 {
     struct client_resource *resource = p;
 
     return resource->release == release_transaction;
 }
 
 static int has_outbound_transactions(struct client *client)
 {
     int ret;
 
     spin_lock_irq(&client->lock);
     ret = idr_for_each(&client->resource_idr,
                is_outbound_transaction_resource, NULL);
     spin_unlock_irq(&client->lock);
 
     return ret;
 }
 
 static int shutdown_resource(int id, void *p, void *data)
 {
     struct client_resource *resource = p;
     struct client *client = data;
 
     resource->release(client, resource);
     client_put(client);
 
     return 0;
 }
 
 static int fw_device_op_release(struct inode *inode, struct file *file)
 {
     struct client *client = file->private_data;
     struct event *event, *next_event;
 
     spin_lock_irq(&client->device->card->lock);
     list_del(&client->phy_receiver_link);
     spin_unlock_irq(&client->device->card->lock);
 
     mutex_lock(&client->device->client_list_mutex);
     list_del(&client->link);
     mutex_unlock(&client->device->client_list_mutex);
 
     if (client->iso_context)
         fw_iso_context_destroy(client->iso_context);
 
     if (client->buffer.pages)
         fw_iso_buffer_destroy(&client->buffer, client->device->card);
 
     /* Freeze client->resource_idr and client->event_list */
     spin_lock_irq(&client->lock);
     client->in_shutdown = true;
     spin_unlock_irq(&client->lock);
 
     wait_event(client->tx_flush_wait, !has_outbound_transactions(client));
 
     idr_for_each(&client->resource_idr, shutdown_resource, client);
     idr_destroy(&client->resource_idr);
 
     list_for_each_entry_safe(event, next_event, &client->event_list, link)
         kfree(event);
 
     client_put(client);
 
     return 0;
 }
 
 static __poll_t fw_device_op_poll(struct file *file, poll_table * pt)
 {
     struct client *client = file->private_data;
     __poll_t mask = 0;
 
     poll_wait(file, &client->wait, pt);
 
     if (fw_device_is_shutdown(client->device))
         mask |= EPOLLHUP | EPOLLERR;
     if (!list_empty(&client->event_list))
         mask |= EPOLLIN | EPOLLRDNORM;
 
     return mask;
 }
 
 const struct file_operations fw_device_ops = {
     .owner      = THIS_MODULE,
     .llseek     = no_llseek,
     .open       = fw_device_op_open,
     .read       = fw_device_op_read,
     .unlocked_ioctl = fw_device_op_ioctl,
     .mmap       = fw_device_op_mmap,
     .release    = fw_device_op_release,
     .poll       = fw_device_op_poll,
     .compat_ioctl   = compat_ptr_ioctl,
 };

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