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firewire: Generalize resource tracking for cdev implementation.

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Generalize the way we keep track of the various resources and
assign a unique handle to each resource.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-03-27 01:43:41 -04:00 committed by Stefan Richter
parent 66dea3e5f6
commit 3964a4496e
2 changed files with 119 additions and 119 deletions
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231
drivers/firewire/fw-device-cdev.c
View File

@ -36,16 +36,16 @@
#include "fw-device.h"
#include "fw-device-cdev.h"
/*
* todo
*
* - bus resets sends a new packet with new generation and node id
*
*/
/* dequeue_event() just kfree()'s the event, so the event has to be
* the first field in the struct. */
struct client;
struct client_resource {
struct list_head link;
void (*release)(struct client *client, struct client_resource *r);
u32 handle;
};
struct event {
struct { void *data; size_t size; } v[2];
struct list_head link;
@ -60,7 +60,7 @@ struct response {
struct event event;
struct fw_transaction transaction;
struct client *client;
struct list_head link;
struct client_resource resource;
struct fw_cdev_event_response response;
};
@ -74,11 +74,7 @@ struct client {
struct fw_device *device;
spinlock_t lock;
u32 resource_handle;
struct list_head handler_list;
struct list_head request_list;
struct list_head transaction_list;
struct list_head descriptor_list;
u32 request_serial;
struct list_head resource_list;
struct list_head event_list;
wait_queue_head_t wait;
u64 bus_reset_closure;
@ -118,10 +114,7 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
client->device = fw_device_get(device);
INIT_LIST_HEAD(&client->event_list);
INIT_LIST_HEAD(&client->handler_list);
INIT_LIST_HEAD(&client->request_list);
INIT_LIST_HEAD(&client->transaction_list);
INIT_LIST_HEAD(&client->descriptor_list);
INIT_LIST_HEAD(&client->resource_list);
spin_lock_init(&client->lock);
init_waitqueue_head(&client->wait);
@ -304,6 +297,53 @@ static int ioctl_get_info(struct client *client, void __user *arg)
return 0;
}
static void
add_client_resource(struct client *client, struct client_resource *resource)
{
unsigned long flags;
spin_lock_irqsave(&client->lock, flags);
list_add_tail(&resource->link, &client->resource_list);
resource->handle = client->resource_handle++;
spin_unlock_irqrestore(&client->lock, flags);
}
static int
release_client_resource(struct client *client, u32 handle,
struct client_resource **resource)
{
struct client_resource *r;
unsigned long flags;
spin_lock_irqsave(&client->lock, flags);
list_for_each_entry(r, &client->resource_list, link) {
if (r->handle == handle) {
list_del(&r->link);
break;
}
}
spin_unlock_irqrestore(&client->lock, flags);
if (&r->link == &client->resource_list)
return -EINVAL;
if (resource)
*resource = r;
else
r->release(client, r);
return 0;
}
static void
release_transaction(struct client *client, struct client_resource *resource)
{
struct response *response =
container_of(resource, struct response, resource);
fw_cancel_transaction(client->device->card, &response->transaction);
}
static void
complete_transaction(struct fw_card *card, int rcode,
void *payload, size_t length, void *data)
@ -319,7 +359,7 @@ complete_transaction(struct fw_card *card, int rcode,
response->response.length);
spin_lock_irqsave(&client->lock, flags);
list_del(&response->link);
list_del(&response->resource.link);
spin_unlock_irqrestore(&client->lock, flags);
response->response.type = FW_CDEV_EVENT_RESPONSE;
@ -334,7 +374,6 @@ static ssize_t ioctl_send_request(struct client *client, void __user *arg)
struct fw_device *device = client->device;
struct fw_cdev_send_request request;
struct response *response;
unsigned long flags;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
@ -358,9 +397,8 @@ static ssize_t ioctl_send_request(struct client *client, void __user *arg)
return -EFAULT;
}
spin_lock_irqsave(&client->lock, flags);
list_add_tail(&response->link, &client->transaction_list);
spin_unlock_irqrestore(&client->lock, flags);
response->resource.release = release_transaction;
add_client_resource(client, &response->resource);
fw_send_request(device->card, &response->transaction,
request.tcode & 0x1f,
@ -381,15 +419,14 @@ struct address_handler {
struct fw_address_handler handler;
__u64 closure;
struct client *client;
struct list_head link;
struct client_resource resource;
};
struct request {
struct fw_request *request;
void *data;
size_t length;
u32 serial;
struct list_head link;
struct client_resource resource;
};
struct request_event {
@ -397,6 +434,17 @@ struct request_event {
struct fw_cdev_event_request request;
};
static void
release_request(struct client *client, struct client_resource *resource)
{
struct request *request =
container_of(resource, struct request, resource);
fw_send_response(client->device->card, request->request,
RCODE_CONFLICT_ERROR);
kfree(request);
}
static void
handle_request(struct fw_card *card, struct fw_request *r,
int tcode, int destination, int source,
@ -407,7 +455,6 @@ handle_request(struct fw_card *card, struct fw_request *r,
struct address_handler *handler = callback_data;
struct request *request;
struct request_event *e;
unsigned long flags;
struct client *client = handler->client;
request = kmalloc(sizeof *request, GFP_ATOMIC);
@ -423,27 +470,35 @@ handle_request(struct fw_card *card, struct fw_request *r,
request->data = payload;
request->length = length;
spin_lock_irqsave(&client->lock, flags);
request->serial = client->request_serial++;
list_add_tail(&request->link, &client->request_list);
spin_unlock_irqrestore(&client->lock, flags);
request->resource.release = release_request;
add_client_resource(client, &request->resource);
e->request.type = FW_CDEV_EVENT_REQUEST;
e->request.tcode = tcode;
e->request.offset = offset;
e->request.length = length;
e->request.serial = request->serial;
e->request.handle = request->resource.handle;
e->request.closure = handler->closure;
queue_event(client, &e->event,
&e->request, sizeof e->request, payload, length);
}
static void
release_address_handler(struct client *client,
struct client_resource *resource)
{
struct address_handler *handler =
container_of(resource, struct address_handler, resource);
fw_core_remove_address_handler(&handler->handler);
kfree(handler);
}
static int ioctl_allocate(struct client *client, void __user *arg)
{
struct fw_cdev_allocate request;
struct address_handler *handler;
unsigned long flags;
struct fw_address_region region;
if (copy_from_user(&request, arg, sizeof request))
@ -466,9 +521,12 @@ static int ioctl_allocate(struct client *client, void __user *arg)
return -EBUSY;
}
spin_lock_irqsave(&client->lock, flags);
list_add_tail(&handler->link, &client->handler_list);
spin_unlock_irqrestore(&client->lock, flags);
handler->resource.release = release_address_handler;
add_client_resource(client, &handler->resource);
request.handle = handler->resource.handle;
if (copy_to_user(arg, &request, sizeof request))
return -EFAULT;
return 0;
}
@ -476,57 +534,30 @@ static int ioctl_allocate(struct client *client, void __user *arg)
static int ioctl_deallocate(struct client *client, void __user *arg)
{
struct fw_cdev_deallocate request;
struct address_handler *handler;
unsigned long flags;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
spin_lock_irqsave(&client->lock, flags);
list_for_each_entry(handler, &client->handler_list, link) {
if (handler->handler.offset == request.offset) {
list_del(&handler->link);
break;
}
}
spin_unlock_irqrestore(&client->lock, flags);
if (&handler->link == &client->handler_list)
return -EINVAL;
fw_core_remove_address_handler(&handler->handler);
return 0;
return release_client_resource(client, request.handle, NULL);
}
static int ioctl_send_response(struct client *client, void __user *arg)
{
struct fw_cdev_send_response request;
struct client_resource *resource;
struct request *r;
unsigned long flags;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
spin_lock_irqsave(&client->lock, flags);
list_for_each_entry(r, &client->request_list, link) {
if (r->serial == request.serial) {
list_del(&r->link);
break;
}
}
spin_unlock_irqrestore(&client->lock, flags);
if (&r->link == &client->request_list)
if (release_client_resource(client, request.handle, &resource) < 0)
return -EINVAL;
r = container_of(resource, struct request, 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;
@ -547,16 +578,24 @@ static int ioctl_initiate_bus_reset(struct client *client, void __user *arg)
struct descriptor {
struct fw_descriptor d;
struct list_head link;
u32 handle;
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);
fw_core_remove_descriptor(&descriptor->d);
kfree(descriptor);
}
static int ioctl_add_descriptor(struct client *client, void __user *arg)
{
struct fw_cdev_add_descriptor request;
struct descriptor *descriptor;
unsigned long flags;
int retval;
if (copy_from_user(&request, arg, sizeof request))
@ -587,12 +626,10 @@ static int ioctl_add_descriptor(struct client *client, void __user *arg)
return retval;
}
spin_lock_irqsave(&client->lock, flags);
list_add_tail(&descriptor->link, &client->descriptor_list);
descriptor->handle = client->resource_handle++;
spin_unlock_irqrestore(&client->lock, flags);
descriptor->resource.release = release_descriptor;
add_client_resource(client, &descriptor->resource);
request.handle = descriptor->resource.handle;
request.handle = descriptor->handle;
if (copy_to_user(arg, &request, sizeof request))
return -EFAULT;
@ -602,28 +639,11 @@ static int ioctl_add_descriptor(struct client *client, void __user *arg)
static int ioctl_remove_descriptor(struct client *client, void __user *arg)
{
struct fw_cdev_remove_descriptor request;
struct descriptor *d;
unsigned long flags;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
spin_lock_irqsave(&client->lock, flags);
list_for_each_entry(d, &client->descriptor_list, link) {
if (d->handle == request.handle) {
list_del(&d->link);
break;
}
}
spin_unlock_irqrestore(&client->lock, flags);
if (&d->link == &client->descriptor_list)
return -EINVAL;
fw_core_remove_descriptor(&d->d);
kfree(d);
return 0;
return release_client_resource(client, request.handle, NULL);
}
static void
@ -895,11 +915,8 @@ static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
static int fw_device_op_release(struct inode *inode, struct file *file)
{
struct client *client = file->private_data;
struct address_handler *h, *next_h;
struct request *r, *next_r;
struct event *e, *next_e;
struct response *t, *next_t;
struct descriptor *d, *next_d;
struct client_resource *r, *next_r;
unsigned long flags;
if (client->buffer.pages)
@ -908,26 +925,8 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
if (client->iso_context)
fw_iso_context_destroy(client->iso_context);
list_for_each_entry_safe(h, next_h, &client->handler_list, link) {
fw_core_remove_address_handler(&h->handler);
kfree(h);
}
list_for_each_entry_safe(r, next_r, &client->request_list, link) {
fw_send_response(client->device->card, r->request,
RCODE_CONFLICT_ERROR);
kfree(r);
}
list_for_each_entry_safe(t, next_t, &client->transaction_list, link) {
fw_cancel_transaction(client->device->card, &t->transaction);
kfree(t);
}
list_for_each_entry_safe(d, next_d, &client->descriptor_list, link) {
fw_core_remove_descriptor(&d->d);
kfree(d);
}
list_for_each_entry_safe(r, next_r, &client->resource_list, link)
r->release(client, r);
/* FIXME: We should wait for the async tasklets to stop
* running before freeing the memory. */

7
drivers/firewire/fw-device-cdev.h
View File

@ -103,7 +103,7 @@ struct fw_cdev_event_request {
__u32 type;
__u32 tcode;
__u64 offset;
__u32 serial;
__u32 handle;
__u32 length;
__u32 data[0];
};
@ -186,17 +186,18 @@ struct fw_cdev_send_response {
__u32 rcode;
__u32 length;
__u64 data;
__u32 serial;
__u32 handle;
};
struct fw_cdev_allocate {
__u64 offset;
__u64 closure;
__u32 length;
__u32 handle;
};
struct fw_cdev_deallocate {
__u64 offset;
__u32 handle;
};
#define FW_CDEV_LONG_RESET 0