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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i915_sw_fence.h (3090B)

      1/*
      2 * SPDX-License-Identifier: MIT
      3 *
      4 * i915_sw_fence.h - library routines for N:M synchronisation points
      5 *
      6 * Copyright (C) 2016 Intel Corporation
      7 */
      8
      9#ifndef _I915_SW_FENCE_H_
     10#define _I915_SW_FENCE_H_
     11
     12#include <linux/dma-fence.h>
     13#include <linux/gfp.h>
     14#include <linux/kref.h>
     15#include <linux/notifier.h> /* for NOTIFY_DONE */
     16#include <linux/wait.h>
     17
     18struct completion;
     19struct dma_resv;
     20struct i915_sw_fence;
     21
     22enum i915_sw_fence_notify {
     23	FENCE_COMPLETE,
     24	FENCE_FREE
     25};
     26
     27typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
     28				      enum i915_sw_fence_notify state);
     29
     30struct i915_sw_fence {
     31	wait_queue_head_t wait;
     32	i915_sw_fence_notify_t fn;
     33#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
     34	unsigned long flags;
     35#endif
     36	atomic_t pending;
     37	int error;
     38};
     39
     40#define I915_SW_FENCE_CHECKED_BIT	0 /* used internally for DAG checking */
     41
     42void __i915_sw_fence_init(struct i915_sw_fence *fence,
     43			  i915_sw_fence_notify_t fn,
     44			  const char *name,
     45			  struct lock_class_key *key);
     46#ifdef CONFIG_LOCKDEP
     47#define i915_sw_fence_init(fence, fn)				\
     48do {								\
     49	static struct lock_class_key __key;			\
     50								\
     51	__i915_sw_fence_init((fence), (fn), #fence, &__key);	\
     52} while (0)
     53#else
     54#define i915_sw_fence_init(fence, fn)				\
     55	__i915_sw_fence_init((fence), (fn), NULL, NULL)
     56#endif
     57
     58void i915_sw_fence_reinit(struct i915_sw_fence *fence);
     59
     60#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
     61void i915_sw_fence_fini(struct i915_sw_fence *fence);
     62#else
     63static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {}
     64#endif
     65
     66void i915_sw_fence_commit(struct i915_sw_fence *fence);
     67
     68int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
     69				 struct i915_sw_fence *after,
     70				 wait_queue_entry_t *wq);
     71int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
     72				     struct i915_sw_fence *after,
     73				     gfp_t gfp);
     74
     75struct i915_sw_dma_fence_cb {
     76	struct dma_fence_cb base;
     77	struct i915_sw_fence *fence;
     78};
     79
     80int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
     81				    struct dma_fence *dma,
     82				    struct i915_sw_dma_fence_cb *cb);
     83int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
     84				  struct dma_fence *dma,
     85				  unsigned long timeout,
     86				  gfp_t gfp);
     87
     88int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
     89				    struct dma_resv *resv,
     90				    const struct dma_fence_ops *exclude,
     91				    bool write,
     92				    unsigned long timeout,
     93				    gfp_t gfp);
     94
     95bool i915_sw_fence_await(struct i915_sw_fence *fence);
     96void i915_sw_fence_complete(struct i915_sw_fence *fence);
     97
     98static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence)
     99{
    100	return atomic_read(&fence->pending) <= 0;
    101}
    102
    103static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
    104{
    105	return atomic_read(&fence->pending) < 0;
    106}
    107
    108static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
    109{
    110	wait_event(fence->wait, i915_sw_fence_done(fence));
    111}
    112
    113static inline void
    114i915_sw_fence_set_error_once(struct i915_sw_fence *fence, int error)
    115{
    116	if (unlikely(error))
    117		cmpxchg(&fence->error, 0, error);
    118}
    119
    120#endif /* _I915_SW_FENCE_H_ */