gpu/drm/drm_exec.c

24  *	struct drm_exec exec;
28  *	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT);
29  *	drm_exec_until_all_locked(&exec) {
30  *		ret = drm_exec_prepare_obj(&exec, boA, 1);
31  *		drm_exec_retry_on_contention(&exec);
35  *		ret = drm_exec_prepare_obj(&exec, boB, 1);
36  *		drm_exec_retry_on_contention(&exec);
41  *	drm_exec_for_each_locked_object(&exec, index, obj) {
45  *	drm_exec_fini(&exec);
54 static void drm_exec_unlock_all(struct drm_exec *exec)
59 	drm_exec_for_each_locked_object_reverse(exec, index, obj) {
64 	drm_gem_object_put(exec->prelocked);
65 	exec->prelocked = NULL;
70  * @exec: the drm_exec object to initialize
79 void drm_exec_init(struct drm_exec *exec, u32 flags, unsigned nr)
84 	exec->flags = flags;
85 	exec->objects = kvmalloc_array(nr, sizeof(void *), GFP_KERNEL);
88 	exec->max_objects = exec->objects ? nr : 0;
89 	exec->num_objects = 0;
90 	exec->contended = DRM_EXEC_DUMMY;
91 	exec->prelocked = NULL;
97  * @exec: the drm_exec object to finalize
102 void drm_exec_fini(struct drm_exec *exec)
104 	drm_exec_unlock_all(exec);
105 	kvfree(exec->objects);
106 	if (exec->contended != DRM_EXEC_DUMMY) {
107 		drm_gem_object_put(exec->contended);
108 		ww_acquire_fini(&exec->ticket);
115  * @exec: the drm_exec object to cleanup
121 bool drm_exec_cleanup(struct drm_exec *exec)
123 	if (likely(!exec->contended)) {
124 		ww_acquire_done(&exec->ticket);
128 	if (likely(exec->contended == DRM_EXEC_DUMMY)) {
129 		exec->contended = NULL;
130 		ww_acquire_init(&exec->ticket, &reservation_ww_class);
134 	drm_exec_unlock_all(exec);
135 	exec->num_objects = 0;
141 static int drm_exec_obj_locked(struct drm_exec *exec,
144 	if (unlikely(exec->num_objects == exec->max_objects)) {
145 		size_t size = exec->max_objects * sizeof(void *);
148 		tmp = kvrealloc(exec->objects, size, size + PAGE_SIZE,
153 		exec->objects = tmp;
154 		exec->max_objects += PAGE_SIZE / sizeof(void *);
157 	exec->objects[exec->num_objects++] = obj;
163 static int drm_exec_lock_contended(struct drm_exec *exec)
165 	struct drm_gem_object *obj = exec->contended;
172 	exec->contended = NULL;
173 	if (exec->flags & DRM_EXEC_INTERRUPTIBLE_WAIT) {
175 						       &exec->ticket);
179 		dma_resv_lock_slow(obj->resv, &exec->ticket);
182 	ret = drm_exec_obj_locked(exec, obj);
186 	exec->prelocked = obj;
199  * @exec: the drm_exec object with the state
208 int drm_exec_lock_obj(struct drm_exec *exec, struct drm_gem_object *obj)
212 	ret = drm_exec_lock_contended(exec);
216 	if (exec->prelocked == obj) {
217 		drm_gem_object_put(exec->prelocked);
218 		exec->prelocked = NULL;
222 	if (exec->flags & DRM_EXEC_INTERRUPTIBLE_WAIT)
223 		ret = dma_resv_lock_interruptible(obj->resv, &exec->ticket);
225 		ret = dma_resv_lock(obj->resv, &exec->ticket);
229 		exec->contended = obj;
234 	    exec->flags & DRM_EXEC_IGNORE_DUPLICATES)
240 	ret = drm_exec_obj_locked(exec, obj);
253  * drm_exec_unlock_obj - unlock a GEM object in this exec context
254  * @exec: the drm_exec object with the state
261 void drm_exec_unlock_obj(struct drm_exec *exec, struct drm_gem_object *obj)
265 	for (i = exec->num_objects; i--;) {
266 		if (exec->objects[i] == obj) {
268 			for (++i; i < exec->num_objects; ++i)
269 				exec->objects[i - 1] = exec->objects[i];
270 			--exec->num_objects;
281  * @exec: the drm_exec object with the state
290 int drm_exec_prepare_obj(struct drm_exec *exec, struct drm_gem_object *obj,
295 	ret = drm_exec_lock_obj(exec, obj);
301 		drm_exec_unlock_obj(exec, obj);
311  * @exec: the drm_exec object with the state
322 int drm_exec_prepare_array(struct drm_exec *exec,
330 		ret = drm_exec_prepare_obj(exec, objects[i], num_fences);