* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/wait.h>
-#include <linux/errno.h>
+#include <linux/compat.h>
+#include <linux/delay.h>
#include <linux/device.h>
-#include <linux/vmalloc.h>
+#include <linux/errno.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/time.h>
#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/mm.h>
-#include <linux/idr.h>
-#include <linux/compat.h>
-#include <linux/firewire-cdev.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 "fw-transaction.h"
-#include "fw-topology.h"
+
#include "fw-device.h"
+#include "fw-topology.h"
+#include "fw-transaction.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;
struct client_resource;
typedef void (*client_resource_release_fn_t)(struct client *,
struct client_resource *);
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 the struct.
+ * 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 {
+struct bus_reset_event {
struct event event;
struct fw_cdev_event_bus_reset reset;
};
-struct response {
+struct outbound_transaction_event {
struct event event;
- struct fw_transaction transaction;
struct client *client;
- struct client_resource resource;
+ struct outbound_transaction_resource r;
struct fw_cdev_event_response response;
};
-struct iso_interrupt {
+struct inbound_transaction_event {
struct event event;
- struct fw_cdev_event_iso_interrupt interrupt;
+ struct fw_cdev_event_request request;
};
-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 iso_interrupt_event {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt interrupt;
+};
- struct list_head link;
+struct iso_resource_event {
+ struct event event;
+ struct fw_cdev_event_iso_resource resource;
};
-static inline void __user *
-u64_to_uptr(__u64 value)
+static inline void __user *u64_to_uptr(__u64 value)
{
return (void __user *)(unsigned long)value;
}
-static inline __u64
-uptr_to_u64(void __user *ptr)
+static inline __u64 uptr_to_u64(void __user *ptr)
{
return (__u64)(unsigned long)ptr;
}
idr_init(&client->resource_idr);
INIT_LIST_HEAD(&client->event_list);
init_waitqueue_head(&client->wait);
+ kref_init(&client->kref);
file->private_data = client;
wake_up_interruptible(&client->wait);
}
-static int
-dequeue_event(struct client *client, char __user *buffer, size_t count)
+static int dequeue_event(struct client *client,
+ char __user *buffer, size_t count)
{
- unsigned long flags;
struct event *event;
size_t size, total;
- int i, retval;
+ int i, ret;
- retval = wait_event_interruptible(client->wait,
- !list_empty(&client->event_list) ||
- fw_device_is_shutdown(client->device));
- if (retval < 0)
- return retval;
+ 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_irqsave(&client->lock, flags);
- event = container_of(client->event_list.next, struct event, link);
+ spin_lock_irq(&client->lock);
+ event = list_first_entry(&client->event_list, struct event, link);
list_del(&event->link);
- spin_unlock_irqrestore(&client->lock, flags);
+ 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)) {
- retval = -EFAULT;
+ ret = -EFAULT;
goto out;
}
total += size;
}
- retval = total;
+ ret = total;
out:
kfree(event);
- return retval;
+ return ret;
}
-static ssize_t
-fw_device_op_read(struct file *file,
- char __user *buffer, size_t count, loff_t *offset)
+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)
+static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
+ struct client *client)
{
struct fw_card *card = client->device->card;
- unsigned long flags;
- spin_lock_irqsave(&card->lock, flags);
+ spin_lock_irq(&card->lock);
event->closure = client->bus_reset_closure;
event->type = FW_CDEV_EVENT_BUS_RESET;
event->irm_node_id = card->irm_node->node_id;
event->root_node_id = card->root_node->node_id;
- spin_unlock_irqrestore(&card->lock, flags);
+ spin_unlock_irq(&card->lock);
}
-static void
-for_each_client(struct fw_device *device,
- void (*callback)(struct client *client))
+static void for_each_client(struct fw_device *device,
+ void (*callback)(struct client *client))
{
struct client *c;
mutex_unlock(&device->client_list_mutex);
}
-static void
-queue_bus_reset_event(struct client *client)
+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 *bus_reset;
+ struct bus_reset_event *e;
- bus_reset = kzalloc(sizeof(*bus_reset), GFP_KERNEL);
- if (bus_reset == NULL) {
+ 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(&bus_reset->reset, client);
+ fill_bus_reset_event(&e->reset, client);
- queue_event(client, &bus_reset->event,
- &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
+ 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)
return 0;
}
-static int
-add_client_resource(struct client *client, struct client_resource *resource,
- gfp_t gfp_mask)
+static int add_client_resource(struct client *client,
+ struct client_resource *resource, gfp_t gfp_mask)
{
unsigned long flags;
int ret;
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)
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)
+static int release_client_resource(struct client *client, u32 handle,
+ client_resource_release_fn_t release,
+ struct client_resource **resource)
{
struct client_resource *r;
- unsigned long flags;
- spin_lock_irqsave(&client->lock, flags);
+ 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_irqrestore(&client->lock, flags);
+ spin_unlock_irq(&client->lock);
if (!(r && r->release == release))
return -EINVAL;
else
r->release(client, r);
+ client_put(client);
+
return 0;
}
-static void
-release_transaction(struct client *client, struct client_resource *resource)
+static void release_transaction(struct client *client,
+ struct client_resource *resource)
{
- struct response *response =
- container_of(resource, struct response, resource);
+ struct outbound_transaction_resource *r = container_of(resource,
+ struct outbound_transaction_resource, resource);
- fw_cancel_transaction(client->device->card, &response->transaction);
+ 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)
+static void complete_transaction(struct fw_card *card, int rcode,
+ void *payload, size_t length, void *data)
{
- struct response *response = data;
- struct client *client = response->client;
+ struct outbound_transaction_event *e = data;
+ struct fw_cdev_event_response *rsp = &e->response;
+ struct client *client = e->client;
unsigned long flags;
- struct fw_cdev_event_response *r = &response->response;
- if (length < r->length)
- r->length = length;
+ if (length < rsp->length)
+ rsp->length = length;
if (rcode == RCODE_COMPLETE)
- memcpy(r->data, payload, r->length);
+ memcpy(rsp->data, payload, rsp->length);
spin_lock_irqsave(&client->lock, flags);
/*
- * If called while in shutdown, the idr tree must be left untouched.
- * The idr handle will be removed later.
+ * 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_remove(&client->resource_idr, response->resource.handle);
+ 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);
- r->type = FW_CDEV_EVENT_RESPONSE;
- r->rcode = rcode;
+ rsp->type = FW_CDEV_EVENT_RESPONSE;
+ rsp->rcode = rcode;
/*
- * In the case that sizeof(*r) doesn't align with the position of the
+ * 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 (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
- queue_event(client, &response->event, r, sizeof(*r),
- r->data, r->length);
+ 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, &response->event, r, sizeof(*r) + r->length,
+ queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
NULL, 0);
+
+ /* Drop the transaction callback's reference */
+ client_put(client);
}
-static int ioctl_send_request(struct client *client, void *buffer)
+static int init_request(struct client *client,
+ struct fw_cdev_send_request *request,
+ int destination_id, int speed)
{
- struct fw_device *device = client->device;
- struct fw_cdev_send_request *request = buffer;
- struct response *response;
+ struct outbound_transaction_event *e;
int ret;
- /* What is the biggest size we'll accept, really? */
- if (request->length > 4096)
- return -EINVAL;
+ if (request->tcode != TCODE_STREAM_DATA &&
+ (request->length > 4096 || request->length > 512 << speed))
+ return -EIO;
- response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
- if (response == NULL)
+ e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
+ if (e == NULL)
return -ENOMEM;
- response->client = client;
- response->response.length = request->length;
- response->response.closure = request->closure;
+ e->client = client;
+ e->response.length = request->length;
+ e->response.closure = request->closure;
if (request->data &&
- copy_from_user(response->response.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_LOCK_VENDOR_DEPENDENT:
break;
default:
- ret = -EINVAL;
- goto failed;
+ return -EINVAL;
}
- response->resource.release = release_transaction;
- ret = add_client_resource(client, &response->resource, GFP_KERNEL);
- if (ret < 0)
- goto failed;
-
- fw_send_request(device->card, &response->transaction,
- request->tcode & 0x1f,
- device->node->node_id,
- request->generation,
- device->max_speed,
- request->offset,
- response->response.data, request->length,
- complete_transaction, response);
-
- if (request->data)
- return sizeof(request) + request->length;
- else
- return sizeof(request);
- failed:
- kfree(response);
-
- return ret;
+ return init_request(client, request, client->device->node_id,
+ client->device->max_speed);
}
-struct address_handler {
- struct fw_address_handler handler;
- __u64 closure;
- struct client *client;
- struct client_resource resource;
-};
-
-struct request {
- struct fw_request *request;
- void *data;
- size_t length;
- struct client_resource resource;
-};
-
-struct request_event {
- struct event event;
- struct fw_cdev_event_request request;
-};
-
-static void
-release_request(struct client *client, struct client_resource *resource)
+static void release_request(struct client *client,
+ struct client_resource *resource)
{
- struct request *request =
- container_of(resource, struct request, resource);
+ struct inbound_transaction_resource *r = container_of(resource,
+ struct inbound_transaction_resource, resource);
- fw_send_response(client->device->card, request->request,
+ fw_send_response(client->device->card, r->request,
RCODE_CONFLICT_ERROR);
- kfree(request);
+ kfree(r);
}
-static void
-handle_request(struct fw_card *card, struct fw_request *r,
- int tcode, int destination, int source,
- int generation, int speed,
- unsigned long long offset,
- void *payload, size_t length, void *callback_data)
+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 *handler = callback_data;
- struct request *request;
- struct request_event *e;
- struct client *client = handler->client;
+ struct address_handler_resource *handler = callback_data;
+ struct inbound_transaction_resource *r;
+ struct inbound_transaction_event *e;
int ret;
- request = kmalloc(sizeof(*request), GFP_ATOMIC);
+ r = kmalloc(sizeof(*r), GFP_ATOMIC);
e = kmalloc(sizeof(*e), GFP_ATOMIC);
- if (request == NULL || e == NULL)
+ if (r == NULL || e == NULL)
goto failed;
- request->request = r;
- request->data = payload;
- request->length = length;
+ r->request = request;
+ r->data = payload;
+ r->length = length;
- request->resource.release = release_request;
- ret = add_client_resource(client, &request->resource, GFP_ATOMIC);
+ r->resource.release = release_request;
+ ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
if (ret < 0)
goto failed;
e->request.tcode = tcode;
e->request.offset = offset;
e->request.length = length;
- e->request.handle = request->resource.handle;
+ e->request.handle = r->resource.handle;
e->request.closure = handler->closure;
- queue_event(client, &e->event,
+ queue_event(handler->client, &e->event,
&e->request, sizeof(e->request), payload, length);
return;
failed:
- kfree(request);
+ kfree(r);
kfree(e);
- fw_send_response(card, r, RCODE_CONFLICT_ERROR);
+ fw_send_response(card, request, RCODE_CONFLICT_ERROR);
}
-static void
-release_address_handler(struct client *client,
- struct client_resource *resource)
+static void release_address_handler(struct client *client,
+ struct client_resource *resource)
{
- struct address_handler *handler =
- container_of(resource, struct address_handler, resource);
+ struct address_handler_resource *r =
+ container_of(resource, struct address_handler_resource, resource);
- fw_core_remove_address_handler(&handler->handler);
- kfree(handler);
+ 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 *handler;
+ struct address_handler_resource *r;
struct fw_address_region region;
int ret;
- handler = kmalloc(sizeof(*handler), GFP_KERNEL);
- if (handler == NULL)
+ r = kmalloc(sizeof(*r), GFP_KERNEL);
+ if (r == NULL)
return -ENOMEM;
region.start = request->offset;
region.end = request->offset + request->length;
- handler->handler.length = request->length;
- handler->handler.address_callback = handle_request;
- handler->handler.callback_data = handler;
- handler->closure = request->closure;
- handler->client = client;
+ 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(&handler->handler, ®ion);
+ ret = fw_core_add_address_handler(&r->handler, ®ion);
if (ret < 0) {
- kfree(handler);
+ kfree(r);
return ret;
}
- handler->resource.release = release_address_handler;
- ret = add_client_resource(client, &handler->resource, GFP_KERNEL);
+ r->resource.release = release_address_handler;
+ ret = add_client_resource(client, &r->resource, GFP_KERNEL);
if (ret < 0) {
- release_address_handler(client, &handler->resource);
+ release_address_handler(client, &r->resource);
return ret;
}
- request->handle = handler->resource.handle;
+ request->handle = r->resource.handle;
return 0;
}
{
struct fw_cdev_send_response *request = buffer;
struct client_resource *resource;
- struct request *r;
+ struct inbound_transaction_resource *r;
if (release_client_resource(client, request->handle,
release_request, &resource) < 0)
return -EINVAL;
- r = container_of(resource, struct request, resource);
+ 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 fw_core_initiate_bus_reset(client->device->card, short_reset);
}
-struct descriptor {
- struct fw_descriptor d;
- struct client_resource resource;
- u32 data[0];
-};
-
static void release_descriptor(struct client *client,
struct client_resource *resource)
{
- struct descriptor *descriptor =
- container_of(resource, struct descriptor, resource);
+ struct descriptor_resource *r =
+ container_of(resource, struct descriptor_resource, resource);
- fw_core_remove_descriptor(&descriptor->d);
- kfree(descriptor);
+ 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 *descriptor;
+ struct fw_card *card = client->device->card;
+ struct descriptor_resource *r;
int ret;
+ /* Access policy: Allow this ioctl only on local nodes' device files. */
+ spin_lock_irq(&card->lock);
+ ret = client->device->node_id != card->local_node->node_id;
+ spin_unlock_irq(&card->lock);
+ if (ret)
+ return -ENOSYS;
+
if (request->length > 256)
return -EINVAL;
- descriptor =
- kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
- if (descriptor == NULL)
+ r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
+ if (r == NULL)
return -ENOMEM;
- if (copy_from_user(descriptor->data,
+ if (copy_from_user(r->data,
u64_to_uptr(request->data), request->length * 4)) {
ret = -EFAULT;
goto failed;
}
- descriptor->d.length = request->length;
- descriptor->d.immediate = request->immediate;
- descriptor->d.key = request->key;
- descriptor->d.data = descriptor->data;
+ 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(&descriptor->d);
+ ret = fw_core_add_descriptor(&r->descriptor);
if (ret < 0)
goto failed;
- descriptor->resource.release = release_descriptor;
- ret = add_client_resource(client, &descriptor->resource, GFP_KERNEL);
+ r->resource.release = release_descriptor;
+ ret = add_client_resource(client, &r->resource, GFP_KERNEL);
if (ret < 0) {
- fw_core_remove_descriptor(&descriptor->d);
+ fw_core_remove_descriptor(&r->descriptor);
goto failed;
}
- request->handle = descriptor->resource.handle;
+ request->handle = r->resource.handle;
return 0;
failed:
- kfree(descriptor);
+ kfree(r);
return ret;
}
release_descriptor, NULL);
}
-static void
-iso_callback(struct fw_iso_context *context, u32 cycle,
- size_t header_length, void *header, void *data)
+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 *irq;
+ struct iso_interrupt_event *e;
- irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
- if (irq == NULL)
+ e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
+ if (e == NULL)
return;
- irq->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
- irq->interrupt.closure = client->iso_closure;
- irq->interrupt.cycle = cycle;
- irq->interrupt.header_length = header_length;
- memcpy(irq->interrupt.header, header, header_length);
- queue_event(client, &irq->event, &irq->interrupt,
- sizeof(irq->interrupt) + header_length, NULL, 0);
+ 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)
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_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)
+static int dispatch_ioctl(struct client *client,
+ unsigned int cmd, void __user *arg)
{
char buffer[256];
- int retval;
+ int ret;
if (_IOC_TYPE(cmd) != '#' ||
_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
return -EFAULT;
}
- retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
- if (retval < 0)
- return retval;
+ 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) ||
return -EFAULT;
}
- return retval;
+ return ret;
}
-static long
-fw_device_op_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
+static long fw_device_op_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
struct client *client = file->private_data;
}
#ifdef CONFIG_COMPAT
-static long
-fw_device_op_compat_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
+static long fw_device_op_compat_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
struct client *client = file->private_data;
struct client *client = file->private_data;
enum dma_data_direction direction;
unsigned long size;
- int page_count, retval;
+ int page_count, ret;
if (fw_device_is_shutdown(client->device))
return -ENODEV;
else
direction = DMA_FROM_DEVICE;
- retval = fw_iso_buffer_init(&client->buffer, client->device->card,
- page_count, direction);
- if (retval < 0)
- return retval;
+ ret = fw_iso_buffer_init(&client->buffer, client->device->card,
+ page_count, direction);
+ if (ret < 0)
+ return ret;
- retval = fw_iso_buffer_map(&client->buffer, vma);
- if (retval < 0)
+ ret = fw_iso_buffer_map(&client->buffer, vma);
+ if (ret < 0)
fw_iso_buffer_destroy(&client->buffer, client->device->card);
- return retval;
+ return ret;
}
static int shutdown_resource(int id, void *p, void *data)
struct client *client = data;
r->release(client, r);
+ client_put(client);
return 0;
}
{
struct client *client = file->private_data;
struct event *e, *next_e;
- unsigned long flags;
mutex_lock(&client->device->client_list_mutex);
list_del(&client->link);
mutex_unlock(&client->device->client_list_mutex);
- if (client->buffer.pages)
- fw_iso_buffer_destroy(&client->buffer, client->device->card);
-
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_irqsave(&client->lock, flags);
+ spin_lock_irq(&client->lock);
client->in_shutdown = true;
- spin_unlock_irqrestore(&client->lock, flags);
+ spin_unlock_irq(&client->lock);
idr_for_each(&client->resource_idr, shutdown_resource, client);
idr_remove_all(&client->resource_idr);
list_for_each_entry_safe(e, next_e, &client->event_list, link)
kfree(e);
- /*
- * FIXME: client should be reference-counted. It's extremely unlikely
- * but there may still be transactions being completed at this point.
- */
- fw_device_put(client->device);
- kfree(client);
+ client_put(client);
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff