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[media] media: Introduce internal index for media entities 

The internal index can be used internally by the framework in order to keep
track of entities for a purpose or another. The internal index is constant
while it's registered to a media device, but the same index may be re-used
once the entity having that index is unregistered.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Sakari Ailus 2015-12-16 11:32:17 -02:00 committed by Mauro Carvalho Chehab
parent 1630b83235
commit 665faa971d
3 changed files with 24 additions and 0 deletions
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17
drivers/media/media-device.c
View File

@ -22,6 +22,7 @@
#include <linux/compat.h>
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/ioctl.h>
#include <linux/media.h>
#include <linux/slab.h>
@ -551,6 +552,17 @@ int __must_check media_device_register_entity(struct media_device *mdev,
entity->num_backlinks = 0;
spin_lock(&mdev->lock);
entity->internal_idx = ida_simple_get(&mdev->entity_internal_idx, 1, 0,
GFP_KERNEL);
if (entity->internal_idx < 0) {
spin_unlock(&mdev->lock);
return entity->internal_idx;
}
mdev->entity_internal_idx_max =
max(mdev->entity_internal_idx_max, entity->internal_idx);
/* Initialize media_gobj embedded at the entity */
media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
@ -579,6 +591,8 @@ static void __media_device_unregister_entity(struct media_entity *entity)
struct media_interface *intf;
unsigned int i;
ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
/* Remove all interface links pointing to this entity */
list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
list_for_each_entry_safe(link, tmp, &intf->links, list) {
@ -632,6 +646,7 @@ void media_device_init(struct media_device *mdev)
INIT_LIST_HEAD(&mdev->links);
spin_lock_init(&mdev->lock);
mutex_init(&mdev->graph_mutex);
ida_init(&mdev->entity_internal_idx);
dev_dbg(mdev->dev, "Media device initialized\n");
}
@ -644,6 +659,8 @@ EXPORT_SYMBOL_GPL(media_device_init);
*/
void media_device_cleanup(struct media_device *mdev)
{
ida_destroy(&mdev->entity_internal_idx);
mdev->entity_internal_idx_max = 0;
mutex_destroy(&mdev->graph_mutex);
}
EXPORT_SYMBOL_GPL(media_device_cleanup);

4
include/media/media-device.h
View File

@ -261,6 +261,7 @@
* in the end provide a way to use driver-specific callbacks.
*/
struct ida;
struct device;
/**
@ -278,6 +279,7 @@ struct device;
* @pad_id: Unique ID used on the last pad registered
* @link_id: Unique ID used on the last link registered
* @intf_devnode_id: Unique ID used on the last interface devnode registered
* @entity_internal_idx: Allocated internal entity indices
* @entities: List of registered entities
* @interfaces: List of registered interfaces
* @pads: List of registered pads
@ -313,6 +315,8 @@ struct media_device {
u32 pad_id;
u32 link_id;
u32 intf_devnode_id;
struct ida entity_internal_idx;
int entity_internal_idx_max;
struct list_head entities;
struct list_head interfaces;

3
include/media/media-entity.h
View File

@ -157,6 +157,8 @@ struct media_entity_operations {
* @num_pads: Number of sink and source pads.
* @num_links: Total number of links, forward and back, enabled and disabled.
* @num_backlinks: Number of backlinks
* @internal_idx: An unique internal entity specific number. The numbers are
* re-used if entities are unregistered or registered again.
* @pads: Pads array with the size defined by @num_pads.
* @links: List of data links.
* @ops: Entity operations.
@ -183,6 +185,7 @@ struct media_entity {
u16 num_pads;
u16 num_links;
u16 num_backlinks;
int internal_idx;
struct media_pad *pads;
struct list_head links;