1 /* 2 * i915_sw_fence.h - library routines for N:M synchronisation points 3 * 4 * Copyright (C) 2016 Intel Corporation 5 * 6 * This file is released under the GPLv2. 7 * 8 */ 9 10 #ifndef _I915_SW_FENCE_H_ 11 #define _I915_SW_FENCE_H_ 12 13 #include <linux/gfp.h> 14 #include <linux/kref.h> 15 #include <linux/notifier.h> /* for NOTIFY_DONE */ 16 #include <linux/wait.h> 17 18 struct completion; 19 struct fence; 20 struct fence_ops; 21 struct reservation_object; 22 23 struct i915_sw_fence { 24 wait_queue_head_t wait; 25 unsigned long flags; 26 struct kref kref; 27 atomic_t pending; 28 }; 29 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) 33 34 enum i915_sw_fence_notify { 35 FENCE_COMPLETE, 36 FENCE_FREE 37 }; 38 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) 42 43 void i915_sw_fence_init(struct i915_sw_fence *fence, i915_sw_fence_notify_t fn); 44 void i915_sw_fence_commit(struct i915_sw_fence *fence); 45 46 int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence, 47 struct i915_sw_fence *after, 48 wait_queue_t *wq); 49 int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence, 50 struct fence *dma, 51 unsigned long timeout, 52 gfp_t gfp); 53 int i915_sw_fence_await_reservation(struct i915_sw_fence *fence, 54 struct reservation_object *resv, 55 const struct fence_ops *exclude, 56 bool write, 57 unsigned long timeout, 58 gfp_t gfp); 59 60 static inline bool i915_sw_fence_done(struct i915_sw_fence *fence) 61 { 62 return atomic_read(&fence->pending) < 0; 63 } 64 65 #endif /* _I915_SW_FENCE_H_ */ 66