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;
29 #define I915_SW_FENCE_CHECKED_BIT 0 /* used internally for DAG checking */
30 #define I915_SW_FENCE_PRIVATE_BIT 1 /* available for use by owner */
31 #define I915_SW_FENCE_MASK (~3)
33 enum i915_sw_fence_notify {
38 typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
39 enum i915_sw_fence_notify state);
40 #define __i915_sw_fence_call __aligned(4)
42 void __i915_sw_fence_init(struct i915_sw_fence *fence,
43 i915_sw_fence_notify_t fn,
45 struct lock_class_key *key);
47 #define i915_sw_fence_init(fence, fn) \
49 static struct lock_class_key __key; \
51 __i915_sw_fence_init((fence), (fn), #fence, &__key); \
54 #define i915_sw_fence_init(fence, fn) \
55 __i915_sw_fence_init((fence), (fn), NULL, NULL)
58 #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
59 void i915_sw_fence_fini(struct i915_sw_fence *fence);
61 static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {}
64 void i915_sw_fence_commit(struct i915_sw_fence *fence);
66 int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
67 struct i915_sw_fence *after,
68 wait_queue_entry_t *wq);
69 int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
70 struct i915_sw_fence *after,
72 int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
73 struct dma_fence *dma,
74 unsigned long timeout,
76 int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
77 struct reservation_object *resv,
78 const struct dma_fence_ops *exclude,
80 unsigned long timeout,
83 static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence)
85 return atomic_read(&fence->pending) <= 0;
88 static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
90 return atomic_read(&fence->pending) < 0;
93 static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
95 wait_event(fence->wait, i915_sw_fence_done(fence));
98 #endif /* _I915_SW_FENCE_H_ */