2 * i915_sw_fence.h - library routines for N:M synchronisation points
4 * Copyright (C) 2016 Intel Corporation
6 * This file is released under the GPLv2.
10 #ifndef _I915_SW_FENCE_H_
11 #define _I915_SW_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>
21 struct reservation_object;
23 struct i915_sw_fence {
24 wait_queue_head_t wait;
30 #define I915_SW_FENCE_CHECKED_BIT 0 /* used internally for DAG checking */
31 #define I915_SW_FENCE_PRIVATE_BIT 1 /* available for use by owner */
32 #define I915_SW_FENCE_MASK (~3)
34 enum i915_sw_fence_notify {
39 typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
40 enum i915_sw_fence_notify state);
41 #define __i915_sw_fence_call __aligned(4)
43 void __i915_sw_fence_init(struct i915_sw_fence *fence,
44 i915_sw_fence_notify_t fn,
46 struct lock_class_key *key);
48 #define i915_sw_fence_init(fence, fn) \
50 static struct lock_class_key __key; \
52 __i915_sw_fence_init((fence), (fn), #fence, &__key); \
55 #define i915_sw_fence_init(fence, fn) \
56 __i915_sw_fence_init((fence), (fn), NULL, NULL)
59 void i915_sw_fence_commit(struct i915_sw_fence *fence);
61 int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
62 struct i915_sw_fence *after,
64 int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
65 struct i915_sw_fence *after,
67 int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
68 struct dma_fence *dma,
69 unsigned long timeout,
71 int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
72 struct reservation_object *resv,
73 const struct dma_fence_ops *exclude,
75 unsigned long timeout,
78 static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence)
80 return atomic_read(&fence->pending) <= 0;
83 static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
85 return atomic_read(&fence->pending) < 0;
88 static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
90 wait_event(fence->wait, i915_sw_fence_done(fence));
93 #endif /* _I915_SW_FENCE_H_ */