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path: root/drivers/firewire/core-cdev.c
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Diffstat (limited to 'drivers/firewire/core-cdev.c')
-rw-r--r--drivers/firewire/core-cdev.c1458
1 files changed, 1458 insertions, 0 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
new file mode 100644
index 000000000000..042c04540474
--- /dev/null
+++ b/drivers/firewire/core-cdev.c
@@ -0,0 +1,1458 @@
+/*
+ * Char device for device raw access
+ *
+ * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/compat.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/firewire.h>
+#include <linux/firewire-cdev.h>
+#include <linux/idr.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/preempt.h>
+#include <linux/spinlock.h>
+#include <linux/time.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "core.h"
+
+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;
+ u64 bus_reset_closure;
+
+ struct fw_iso_context *iso_context;
+ u64 iso_closure;
+ struct fw_iso_buffer buffer;
+ unsigned long vm_start;
+
+ 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_request *request;
+ void *data;
+ size_t length;
+};
+
+struct descriptor_resource {
+ struct client_resource resource;
+ struct fw_descriptor descriptor;
+ u32 data[0];
+};
+
+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 schedule_iso_resource(struct iso_resource *);
+static void release_iso_resource(struct client *, struct client_resource *);
+
+/*
+ * 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;
+ struct fw_cdev_event_request request;
+};
+
+struct iso_interrupt_event {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt interrupt;
+};
+
+struct iso_resource_event {
+ struct event event;
+ struct fw_cdev_event_iso_resource resource;
+};
+
+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;
+}
+
+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);
+ kref_init(&client->kref);
+
+ file->private_data = client;
+
+ mutex_lock(&device->client_list_mutex);
+ list_add_tail(&client->link, &device->client_list);
+ mutex_unlock(&device->client_list_mutex);
+
+ return 0;
+}
+
+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 = 0; /* FIXME: We don't track the BM. */
+ 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)
+{
+ struct client_resource *r = p;
+
+ if (r->release == release_iso_resource)
+ schedule_iso_resource(container_of(r,
+ struct iso_resource, resource));
+ 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) {
+ fw_notify("Out of memory when allocating bus reset event\n");
+ 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);
+}
+
+static int ioctl_get_info(struct client *client, void *buffer)
+{
+ struct fw_cdev_get_info *get_info = buffer;
+ struct fw_cdev_event_bus_reset bus_reset;
+ unsigned long ret = 0;
+
+ client->version = get_info->version;
+ get_info->version = FW_CDEV_VERSION;
+ get_info->card = client->device->card->index;
+
+ down_read(&fw_device_rwsem);
+
+ if (get_info->rom != 0) {
+ void __user *uptr = u64_to_uptr(get_info->rom);
+ size_t want = get_info->rom_length;
+ size_t have = client->device->config_rom_length * 4;
+
+ ret = copy_to_user(uptr, client->device->config_rom,
+ min(want, have));
+ }
+ get_info->rom_length = client->device->config_rom_length * 4;
+
+ up_read(&fw_device_rwsem);
+
+ if (ret != 0)
+ return -EFAULT;
+
+ client->bus_reset_closure = get_info->bus_reset_closure;
+ if (get_info->bus_reset != 0) {
+ void __user *uptr = u64_to_uptr(get_info->bus_reset);
+
+ fill_bus_reset_event(&bus_reset, client);
+ if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int add_client_resource(struct client *client,
+ struct client_resource *resource, gfp_t gfp_mask)
+{
+ unsigned long flags;
+ int ret;
+
+ retry:
+ if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
+ return -ENOMEM;
+
+ spin_lock_irqsave(&client->lock, flags);
+ if (client->in_shutdown)
+ ret = -ECANCELED;
+ else
+ ret = idr_get_new(&client->resource_idr, resource,
+ &resource->handle);
+ if (ret >= 0) {
+ client_get(client);
+ if (resource->release == release_iso_resource)
+ schedule_iso_resource(container_of(resource,
+ struct iso_resource, resource));
+ }
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ if (ret == -EAGAIN)
+ goto retry;
+
+ return ret < 0 ? ret : 0;
+}
+
+static int release_client_resource(struct client *client, u32 handle,
+ client_resource_release_fn_t release,
+ struct client_resource **resource)
+{
+ struct client_resource *r;
+
+ spin_lock_irq(&client->lock);
+ if (client->in_shutdown)
+ r = NULL;
+ else
+ r = idr_find(&client->resource_idr, handle);
+ if (r && r->release == release)
+ idr_remove(&client->resource_idr, handle);
+ spin_unlock_irq(&client->lock);
+
+ if (!(r && r->release == release))
+ return -EINVAL;
+
+ if (resource)
+ *resource = r;
+ else
+ r->release(client, r);
+
+ client_put(client);
+
+ return 0;
+}
+
+static void release_transaction(struct client *client,
+ struct client_resource *resource)
+{
+ struct outbound_transaction_resource *r = container_of(resource,
+ struct outbound_transaction_resource, resource);
+
+ fw_cancel_transaction(client->device->card, &r->transaction);
+}
+
+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);
+ /*
+ * 1. If called while in shutdown, the idr tree must be left untouched.
+ * The idr handle will be removed and the client reference will be
+ * dropped later.
+ * 2. If the call chain was release_client_resource ->
+ * release_transaction -> complete_transaction (instead of a normal
+ * conclusion of the transaction), i.e. if this resource was already
+ * unregistered from the idr, the client reference will be dropped
+ * by release_client_resource and we must not drop it here.
+ */
+ if (!client->in_shutdown &&
+ idr_find(&client->resource_idr, e->r.resource.handle)) {
+ idr_remove(&client->resource_idr, e->r.resource.handle);
+ /* Drop the idr's reference */
+ client_put(client);
+ }
+ 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 transaction callback'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;
+
+ 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;
+
+ /* Get a reference for the transaction callback */
+ client_get(client);
+
+ 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, void *buffer)
+{
+ struct fw_cdev_send_request *request = buffer;
+
+ switch (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, request, client->device->node_id,
+ client->device->max_speed);
+}
+
+static void release_request(struct client *client,
+ struct client_resource *resource)
+{
+ struct inbound_transaction_resource *r = container_of(resource,
+ struct inbound_transaction_resource, resource);
+
+ fw_send_response(client->device->card, r->request,
+ RCODE_CONFLICT_ERROR);
+ kfree(r);
+}
+
+static void handle_request(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source,
+ int generation, int speed,
+ 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;
+ int ret;
+
+ r = kmalloc(sizeof(*r), GFP_ATOMIC);
+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
+ if (r == NULL || e == NULL)
+ goto failed;
+
+ r->request = request;
+ r->data = payload;
+ r->length = length;
+
+ r->resource.release = release_request;
+ ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
+ if (ret < 0)
+ goto failed;
+
+ e->request.type = FW_CDEV_EVENT_REQUEST;
+ e->request.tcode = tcode;
+ e->request.offset = offset;
+ e->request.length = length;
+ e->request.handle = r->resource.handle;
+ e->request.closure = handler->closure;
+
+ queue_event(handler->client, &e->event,
+ &e->request, sizeof(e->request), payload, length);
+ return;
+
+ failed:
+ kfree(r);
+ kfree(e);
+ fw_send_response(card, request, RCODE_CONFLICT_ERROR);
+}
+
+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, void *buffer)
+{
+ struct fw_cdev_allocate *request = buffer;
+ 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 = request->offset;
+ region.end = request->offset + request->length;
+ r->handler.length = request->length;
+ r->handler.address_callback = handle_request;
+ r->handler.callback_data = r;
+ r->closure = request->closure;
+ r->client = client;
+
+ ret = fw_core_add_address_handler(&r->handler, &region);
+ if (ret < 0) {
+ kfree(r);
+ return ret;
+ }
+
+ 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;
+ }
+ request->handle = r->resource.handle;
+
+ return 0;
+}
+
+static int ioctl_deallocate(struct client *client, void *buffer)
+{
+ struct fw_cdev_deallocate *request = buffer;
+
+ return release_client_resource(client, request->handle,
+ release_address_handler, NULL);
+}
+
+static int ioctl_send_response(struct client *client, void *buffer)
+{
+ struct fw_cdev_send_response *request = buffer;
+ struct client_resource *resource;
+ struct inbound_transaction_resource *r;
+
+ if (release_client_resource(client, request->handle,
+ release_request, &resource) < 0)
+ return -EINVAL;
+
+ r = container_of(resource, struct inbound_transaction_resource,
+ resource);
+ if (request->length < r->length)
+ r->length = request->length;
+ if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
+ return -EFAULT;
+
+ fw_send_response(client->device->card, r->request, request->rcode);
+ kfree(r);
+
+ return 0;
+}
+
+static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
+{
+ struct fw_cdev_initiate_bus_reset *request = buffer;
+ int short_reset;
+
+ short_reset = (request->type == FW_CDEV_SHORT_RESET);
+
+ return fw_core_initiate_bus_reset(client->device->card, short_reset);
+}
+
+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, void *buffer)
+{
+ struct fw_cdev_add_descriptor *request = buffer;
+ 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 (request->length > 256)
+ return -EINVAL;
+
+ r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
+ if (r == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(r->data,
+ u64_to_uptr(request->data), request->length * 4)) {
+ ret = -EFAULT;
+ goto failed;
+ }
+
+ r->descriptor.length = request->length;
+ r->descriptor.immediate = request->immediate;
+ r->descriptor.key = request->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;
+ }
+ request->handle = r->resource.handle;
+
+ return 0;
+ failed:
+ kfree(r);
+
+ return ret;
+}
+
+static int ioctl_remove_descriptor(struct client *client, void *buffer)
+{
+ struct fw_cdev_remove_descriptor *request = buffer;
+
+ return release_client_resource(client, request->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 = kzalloc(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 int ioctl_create_iso_context(struct client *client, void *buffer)
+{
+ struct fw_cdev_create_iso_context *request = buffer;
+ struct fw_iso_context *context;
+
+ /* We only support one context at this time. */
+ if (client->iso_context != NULL)
+ return -EBUSY;
+
+ if (request->channel > 63)
+ return -EINVAL;
+
+ switch (request->type) {
+ case FW_ISO_CONTEXT_RECEIVE:
+ if (request->header_size < 4 || (request->header_size & 3))
+ return -EINVAL;
+
+ break;
+
+ case FW_ISO_CONTEXT_TRANSMIT:
+ if (request->speed > SCODE_3200)
+ return -EINVAL;
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ context = fw_iso_context_create(client->device->card,
+ request->type,
+ request->channel,
+ request->speed,
+ request->header_size,
+ iso_callback, client);
+ if (IS_ERR(context))
+ return PTR_ERR(context);
+
+ client->iso_closure = request->closure;
+ client->iso_context = context;
+
+ /* We only support one context at this time. */
+ request->handle = 0;
+
+ return 0;
+}
+
+/* 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, void *buffer)
+{
+ struct fw_cdev_queue_iso *request = buffer;
+ struct fw_cdev_iso_packet __user *p, *end, *next;
+ struct fw_iso_context *ctx = client->iso_context;
+ unsigned long payload, buffer_end, header_length;
+ u32 control;
+ int count;
+ struct {
+ struct fw_iso_packet packet;
+ u8 header[256];
+ } u;
+
+ if (ctx == NULL || request->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 request->data pointer is ignored.
+ */
+
+ payload = (unsigned long)request->data - client->vm_start;
+ buffer_end = client->buffer.page_count << PAGE_SHIFT;
+ if (request->data == 0 || client->buffer.pages == NULL ||
+ payload >= buffer_end) {
+ payload = 0;
+ buffer_end = 0;
+ }
+
+ p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
+
+ if (!access_ok(VERIFY_READ, p, request->size))
+ return -EFAULT;
+
+ end = (void __user *)p + request->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);
+
+ if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
+ header_length = u.packet.header_length;
+ } else {
+ /*
+ * We require that header_length is a multiple of
+ * the fixed header size, ctx->header_size.
+ */
+ if (ctx->header_size == 0) {
+ if (u.packet.header_length > 0)
+ return -EINVAL;
+ } else if (u.packet.header_length % ctx->header_size != 0) {
+ return -EINVAL;
+ }
+ header_length = 0;
+ }
+
+ next = (struct fw_cdev_iso_packet __user *)
+ &p->header[header_length / 4];
+ if (next > end)
+ return -EINVAL;
+ if (__copy_from_user
+ (u.packet.header, p->header, header_length))
+ 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++;
+ }
+
+ request->size -= uptr_to_u64(p) - request->packets;
+ request->packets = uptr_to_u64(p);
+ request->data = client->vm_start + payload;
+
+ return count;
+}
+
+static int ioctl_start_iso(struct client *client, void *buffer)
+{
+ struct fw_cdev_start_iso *request = buffer;
+
+ if (client->iso_context == NULL || request->handle != 0)
+ return -EINVAL;
+
+ if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
+ if (request->tags == 0 || request->tags > 15)
+ return -EINVAL;
+
+ if (request->sync > 15)
+ return -EINVAL;
+ }
+
+ return fw_iso_context_start(client->iso_context, request->cycle,
+ request->sync, request->tags);
+}
+
+static int ioctl_stop_iso(struct client *client, void *buffer)
+{
+ struct fw_cdev_stop_iso *request = buffer;
+
+ if (client->iso_context == NULL || request->handle != 0)
+ return -EINVAL;
+
+ return fw_iso_context_stop(client->iso_context);
+}
+
+static int ioctl_get_cycle_timer(struct client *client, void *buffer)
+{
+ struct fw_cdev_get_cycle_timer *request = buffer;
+ struct fw_card *card = client->device->card;
+ unsigned long long bus_time;
+ struct timeval tv;
+ unsigned long flags;
+
+ preempt_disable();
+ local_irq_save(flags);
+
+ bus_time = card->driver->get_bus_time(card);
+ do_gettimeofday(&tv);
+
+ local_irq_restore(flags);
+ preempt_enable();
+
+ request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
+ request->cycle_timer = bus_time & 0xffffffff;
+ 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_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
+ if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
+ client_get(client);
+ 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_find(&client->resource_idr, r->resource.handle)) {
+ 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->resource.handle = r->resource.handle;
+ e->resource.channel = channel;
+ e->resource.bandwidth = bandwidth;
+
+ queue_event(client, &e->event,
+ &e->resource, sizeof(e->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 schedule_iso_resource(struct iso_resource *r)
+{
+ client_get(r->client);
+ if (!schedule_delayed_work(&r->work, 0))
+ client_put(r->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);
+ 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 ||
+ request->bandwidth < 0)
+ 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->resource.closure = request->closure;
+ e1->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
+ e2->resource.closure = request->closure;
+ e2->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);
+ }
+ 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, void *buffer)
+{
+ struct fw_cdev_allocate_iso_resource *request = buffer;
+
+ return init_iso_resource(client, request, ISO_RES_ALLOC);
+}
+
+static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
+{
+ struct fw_cdev_deallocate *request = buffer;
+
+ return release_client_resource(client, request->handle,
+ release_iso_resource, NULL);
+}
+
+static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
+{
+ struct fw_cdev_allocate_iso_resource *request = buffer;
+
+ return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
+}
+
+static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
+{
+ struct fw_cdev_allocate_iso_resource *request = buffer;
+
+ return init_iso_resource(client, request, 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, void *buffer)
+{
+ return client->device->max_speed;
+}
+
+static int ioctl_send_broadcast_request(struct client *client, void *buffer)
+{
+ struct fw_cdev_send_request *request = buffer;
+
+ switch (request->tcode) {
+ case TCODE_WRITE_QUADLET_REQUEST:
+ case TCODE_WRITE_BLOCK_REQUEST:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Security policy: Only allow accesses to Units Space. */
+ if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
+ return -EACCES;
+
+ return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
+}
+
+static int ioctl_send_stream_packet(struct client *client, void *buffer)
+{
+ struct fw_cdev_send_stream_packet *p = buffer;
+ struct fw_cdev_send_request request;
+ int dest;
+
+ if (p->speed > client->device->card->link_speed ||
+ p->length > 1024 << p->speed)
+ return -EIO;
+
+ if (p->tag > 3 || p->channel > 63 || p->sy > 15)
+ return -EINVAL;
+
+ dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
+ request.tcode = TCODE_STREAM_DATA;
+ request.length = p->length;
+ request.closure = p->closure;
+ request.data = p->data;
+ request.generation = p->generation;
+
+ return init_request(client, &request, dest, p->speed);
+}
+
+static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
+ ioctl_get_info,
+ ioctl_send_request,
+ ioctl_allocate,
+ ioctl_deallocate,
+ ioctl_send_response,
+ ioctl_initiate_bus_reset,
+ ioctl_add_descriptor,
+ ioctl_remove_descriptor,
+ ioctl_create_iso_context,
+ ioctl_queue_iso,
+ ioctl_start_iso,
+ ioctl_stop_iso,
+ ioctl_get_cycle_timer,
+ ioctl_allocate_iso_resource,
+ ioctl_deallocate_iso_resource,
+ ioctl_allocate_iso_resource_once,
+ ioctl_deallocate_iso_resource_once,
+ ioctl_get_speed,
+ ioctl_send_broadcast_request,
+ ioctl_send_stream_packet,
+};
+
+static int dispatch_ioctl(struct client *client,
+ unsigned int cmd, void __user *arg)
+{
+ char buffer[256];
+ int ret;
+
+ if (_IOC_TYPE(cmd) != '#' ||
+ _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
+ return -EINVAL;
+
+ if (_IOC_DIR(cmd) & _IOC_WRITE) {
+ if (_IOC_SIZE(cmd) > sizeof(buffer) ||
+ 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 (_IOC_SIZE(cmd) > sizeof(buffer) ||
+ 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)
+{
+ struct client *client = file->private_data;
+
+ if (fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
+ return dispatch_ioctl(client, cmd, (void __user *) arg);
+}
+
+#ifdef CONFIG_COMPAT
+static long fw_device_op_compat_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct client *client = file->private_data;
+
+ if (fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
+ return dispatch_ioctl(client, cmd, compat_ptr(arg));
+}
+#endif
+
+static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct client *client = file->private_data;
+ enum dma_data_direction direction;
+ 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;
+
+ if (vma->vm_flags & VM_WRITE)
+ direction = DMA_TO_DEVICE;
+ else
+ direction = DMA_FROM_DEVICE;
+
+ ret = fw_iso_buffer_init(&client->buffer, client->device->card,
+ page_count, direction);
+ if (ret < 0)
+ return ret;
+
+ ret = fw_iso_buffer_map(&client->buffer, vma);
+ if (ret < 0)
+ fw_iso_buffer_destroy(&client->buffer, client->device->card);
+
+ return ret;
+}
+
+static int shutdown_resource(int id, void *p, void *data)
+{
+ struct client_resource *r = p;
+ struct client *client = data;
+
+ r->release(client, r);
+ 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 *e, *next_e;
+
+ 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);
+
+ idr_for_each(&client->resource_idr, shutdown_resource, client);
+ idr_remove_all(&client->resource_idr);
+ idr_destroy(&client->resource_idr);
+
+ list_for_each_entry_safe(e, next_e, &client->event_list, link)
+ kfree(e);
+
+ client_put(client);
+
+ return 0;
+}
+
+static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
+{
+ struct client *client = file->private_data;
+ unsigned int mask = 0;
+
+ poll_wait(file, &client->wait, pt);
+
+ if (fw_device_is_shutdown(client->device))
+ mask |= POLLHUP | POLLERR;
+ if (!list_empty(&client->event_list))
+ mask |= POLLIN | POLLRDNORM;
+
+ return mask;
+}
+
+const struct file_operations fw_device_ops = {
+ .owner = THIS_MODULE,
+ .open = fw_device_op_open,
+ .read = fw_device_op_read,
+ .unlocked_ioctl = fw_device_op_ioctl,
+ .poll = fw_device_op_poll,
+ .release = fw_device_op_release,
+ .mmap = fw_device_op_mmap,
+
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = fw_device_op_compat_ioctl,
+#endif
+};