cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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drm_syncobj.h (3943B)

      1/*
      2 * Copyright © 2017 Red Hat
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice (including the next
     12 * paragraph) shall be included in all copies or substantial portions of the
     13 * Software.
     14 *
     15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21 * IN THE SOFTWARE.
     22 *
     23 * Authors:
     24 *
     25 */
     26#ifndef __DRM_SYNCOBJ_H__
     27#define __DRM_SYNCOBJ_H__
     28
     29#include <linux/dma-fence.h>
     30#include <linux/dma-fence-chain.h>
     31
     32struct drm_file;
     33
     34/**
     35 * struct drm_syncobj - sync object.
     36 *
     37 * This structure defines a generic sync object which wraps a &dma_fence.
     38 */
     39struct drm_syncobj {
     40	/**
     41	 * @refcount: Reference count of this object.
     42	 */
     43	struct kref refcount;
     44	/**
     45	 * @fence:
     46	 * NULL or a pointer to the fence bound to this object.
     47	 *
     48	 * This field should not be used directly. Use drm_syncobj_fence_get()
     49	 * and drm_syncobj_replace_fence() instead.
     50	 */
     51	struct dma_fence __rcu *fence;
     52	/**
     53	 * @cb_list: List of callbacks to call when the &fence gets replaced.
     54	 */
     55	struct list_head cb_list;
     56	/**
     57	 * @lock: Protects &cb_list and write-locks &fence.
     58	 */
     59	spinlock_t lock;
     60	/**
     61	 * @file: A file backing for this syncobj.
     62	 */
     63	struct file *file;
     64};
     65
     66void drm_syncobj_free(struct kref *kref);
     67
     68/**
     69 * drm_syncobj_get - acquire a syncobj reference
     70 * @obj: sync object
     71 *
     72 * This acquires an additional reference to @obj. It is illegal to call this
     73 * without already holding a reference. No locks required.
     74 */
     75static inline void
     76drm_syncobj_get(struct drm_syncobj *obj)
     77{
     78	kref_get(&obj->refcount);
     79}
     80
     81/**
     82 * drm_syncobj_put - release a reference to a sync object.
     83 * @obj: sync object.
     84 */
     85static inline void
     86drm_syncobj_put(struct drm_syncobj *obj)
     87{
     88	kref_put(&obj->refcount, drm_syncobj_free);
     89}
     90
     91/**
     92 * drm_syncobj_fence_get - get a reference to a fence in a sync object
     93 * @syncobj: sync object.
     94 *
     95 * This acquires additional reference to &drm_syncobj.fence contained in @obj,
     96 * if not NULL. It is illegal to call this without already holding a reference.
     97 * No locks required.
     98 *
     99 * Returns:
    100 * Either the fence of @obj or NULL if there's none.
    101 */
    102static inline struct dma_fence *
    103drm_syncobj_fence_get(struct drm_syncobj *syncobj)
    104{
    105	struct dma_fence *fence;
    106
    107	rcu_read_lock();
    108	fence = dma_fence_get_rcu_safe(&syncobj->fence);
    109	rcu_read_unlock();
    110
    111	return fence;
    112}
    113
    114struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
    115				     u32 handle);
    116void drm_syncobj_add_point(struct drm_syncobj *syncobj,
    117			   struct dma_fence_chain *chain,
    118			   struct dma_fence *fence,
    119			   uint64_t point);
    120void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
    121			       struct dma_fence *fence);
    122int drm_syncobj_find_fence(struct drm_file *file_private,
    123			   u32 handle, u64 point, u64 flags,
    124			   struct dma_fence **fence);
    125void drm_syncobj_free(struct kref *kref);
    126int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
    127		       struct dma_fence *fence);
    128int drm_syncobj_get_handle(struct drm_file *file_private,
    129			   struct drm_syncobj *syncobj, u32 *handle);
    130int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd);
    131
    132#endif