linux/drivers/gpu/drm/scheduler/sched_fence.c

/*
 * Copyright 2015 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/wait.h>

#include <drm/gpu_scheduler.h>

static struct kmem_cache *sched_fence_slab;

static int __init drm_sched_fence_slab_init(void)
{ … }

static void __exit drm_sched_fence_slab_fini(void)
{ … }

static void drm_sched_fence_set_parent(struct drm_sched_fence *s_fence,
				       struct dma_fence *fence)
{ … }

void drm_sched_fence_scheduled(struct drm_sched_fence *fence,
			       struct dma_fence *parent)
{ … }

void drm_sched_fence_finished(struct drm_sched_fence *fence, int result)
{ … }

static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
{ … }

static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
{ … }

static void drm_sched_fence_free_rcu(struct rcu_head *rcu)
{ … }

/**
 * drm_sched_fence_free - free up an uninitialized fence
 *
 * @fence: fence to free
 *
 * Free up the fence memory. Should only be used if drm_sched_fence_init()
 * has not been called yet.
 */
void drm_sched_fence_free(struct drm_sched_fence *fence)
{ … }

/**
 * drm_sched_fence_release_scheduled - callback that fence can be freed
 *
 * @f: fence
 *
 * This function is called when the reference count becomes zero.
 * It just RCU schedules freeing up the fence.
 */
static void drm_sched_fence_release_scheduled(struct dma_fence *f)
{ … }

/**
 * drm_sched_fence_release_finished - drop extra reference
 *
 * @f: fence
 *
 * Drop the extra reference from the scheduled fence to the base fence.
 */
static void drm_sched_fence_release_finished(struct dma_fence *f)
{ … }

static void drm_sched_fence_set_deadline_finished(struct dma_fence *f,
						  ktime_t deadline)
{ … }

static const struct dma_fence_ops drm_sched_fence_ops_scheduled = …;

static const struct dma_fence_ops drm_sched_fence_ops_finished = …;

struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
{ … }
EXPORT_SYMBOL(…);

struct drm_sched_fence *drm_sched_fence_alloc(struct drm_sched_entity *entity,
					      void *owner)
{ … }

void drm_sched_fence_init(struct drm_sched_fence *fence,
			  struct drm_sched_entity *entity)
{ … }

module_init(…) …;
module_exit(drm_sched_fence_slab_fini);

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;