124 строки
3.3 KiB
C
124 строки
3.3 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
|
||
|
|
||
|
#ifndef __DRM_EXEC_H__
|
||
|
#define __DRM_EXEC_H__
|
||
|
|
||
|
#include <linux/ww_mutex.h>
|
||
|
|
||
|
#define DRM_EXEC_INTERRUPTIBLE_WAIT BIT(0)
|
||
|
#define DRM_EXEC_IGNORE_DUPLICATES BIT(1)
|
||
|
|
||
|
struct drm_gem_object;
|
||
|
|
||
|
/**
|
||
|
* struct drm_exec - Execution context
|
||
|
*/
|
||
|
struct drm_exec {
|
||
|
/**
|
||
|
* @flags: Flags to control locking behavior
|
||
|
*/
|
||
|
uint32_t flags;
|
||
|
|
||
|
/**
|
||
|
* @ticket: WW ticket used for acquiring locks
|
||
|
*/
|
||
|
struct ww_acquire_ctx ticket;
|
||
|
|
||
|
/**
|
||
|
* @num_objects: number of objects locked
|
||
|
*/
|
||
|
unsigned int num_objects;
|
||
|
|
||
|
/**
|
||
|
* @max_objects: maximum objects in array
|
||
|
*/
|
||
|
unsigned int max_objects;
|
||
|
|
||
|
/**
|
||
|
* @objects: array of the locked objects
|
||
|
*/
|
||
|
struct drm_gem_object **objects;
|
||
|
|
||
|
/**
|
||
|
* @contended: contended GEM object we backed off for
|
||
|
*/
|
||
|
struct drm_gem_object *contended;
|
||
|
|
||
|
/**
|
||
|
* @prelocked: already locked GEM object due to contention
|
||
|
*/
|
||
|
struct drm_gem_object *prelocked;
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* drm_exec_for_each_locked_object - iterate over all the locked objects
|
||
|
* @exec: drm_exec object
|
||
|
* @index: unsigned long index for the iteration
|
||
|
* @obj: the current GEM object
|
||
|
*
|
||
|
* Iterate over all the locked GEM objects inside the drm_exec object.
|
||
|
*/
|
||
|
#define drm_exec_for_each_locked_object(exec, index, obj) \
|
||
|
for (index = 0, obj = (exec)->objects[0]; \
|
||
|
index < (exec)->num_objects; \
|
||
|
++index, obj = (exec)->objects[index])
|
||
|
|
||
|
/**
|
||
|
* drm_exec_until_all_locked - loop until all GEM objects are locked
|
||
|
* @exec: drm_exec object
|
||
|
*
|
||
|
* Core functionality of the drm_exec object. Loops until all GEM objects are
|
||
|
* locked and no more contention exists. At the beginning of the loop it is
|
||
|
* guaranteed that no GEM object is locked.
|
||
|
*
|
||
|
* Since labels can't be defined local to the loops body we use a jump pointer
|
||
|
* to make sure that the retry is only used from within the loops body.
|
||
|
*/
|
||
|
#define drm_exec_until_all_locked(exec) \
|
||
|
for (void *__drm_exec_retry_ptr; ({ \
|
||
|
__label__ __drm_exec_retry; \
|
||
|
__drm_exec_retry: \
|
||
|
__drm_exec_retry_ptr = &&__drm_exec_retry; \
|
||
|
(void)__drm_exec_retry_ptr; \
|
||
|
drm_exec_cleanup(exec); \
|
||
|
});)
|
||
|
|
||
|
/**
|
||
|
* drm_exec_retry_on_contention - restart the loop to grap all locks
|
||
|
* @exec: drm_exec object
|
||
|
*
|
||
|
* Control flow helper to continue when a contention was detected and we need to
|
||
|
* clean up and re-start the loop to prepare all GEM objects.
|
||
|
*/
|
||
|
#define drm_exec_retry_on_contention(exec) \
|
||
|
do { \
|
||
|
if (unlikely(drm_exec_is_contended(exec))) \
|
||
|
goto *__drm_exec_retry_ptr; \
|
||
|
} while (0)
|
||
|
|
||
|
/**
|
||
|
* drm_exec_is_contended - check for contention
|
||
|
* @exec: drm_exec object
|
||
|
*
|
||
|
* Returns true if the drm_exec object has run into some contention while
|
||
|
* locking a GEM object and needs to clean up.
|
||
|
*/
|
||
|
static inline bool drm_exec_is_contended(struct drm_exec *exec)
|
||
|
{
|
||
|
return !!exec->contended;
|
||
|
}
|
||
|
|
||
|
void drm_exec_init(struct drm_exec *exec, uint32_t flags);
|
||
|
void drm_exec_fini(struct drm_exec *exec);
|
||
|
bool drm_exec_cleanup(struct drm_exec *exec);
|
||
|
int drm_exec_lock_obj(struct drm_exec *exec, struct drm_gem_object *obj);
|
||
|
void drm_exec_unlock_obj(struct drm_exec *exec, struct drm_gem_object *obj);
|
||
|
int drm_exec_prepare_obj(struct drm_exec *exec, struct drm_gem_object *obj,
|
||
|
unsigned int num_fences);
|
||
|
int drm_exec_prepare_array(struct drm_exec *exec,
|
||
|
struct drm_gem_object **objects,
|
||
|
unsigned int num_objects,
|
||
|
unsigned int num_fences);
|
||
|
|
||
|
#endif
|