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 dma_fence; 20 struct dma_fence_ops; 21 struct reservation_object; 22 23 struct i915_sw_fence { 24 wait_queue_head_t wait; 25 unsigned long flags; 26 atomic_t pending; 27 }; 28 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) 32 33 enum i915_sw_fence_notify { 34 FENCE_COMPLETE, 35 FENCE_FREE 36 }; 37 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) 41 42 void __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) \ 48 do { \ 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 58 #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS 59 void i915_sw_fence_fini(struct i915_sw_fence *fence); 60 #else 61 static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {} 62 #endif 63 64 void i915_sw_fence_commit(struct i915_sw_fence *fence); 65 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, 71 gfp_t gfp); 72 int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence, 73 struct dma_fence *dma, 74 unsigned long timeout, 75 gfp_t gfp); 76 int i915_sw_fence_await_reservation(struct i915_sw_fence *fence, 77 struct reservation_object *resv, 78 const struct dma_fence_ops *exclude, 79 bool write, 80 unsigned long timeout, 81 gfp_t gfp); 82 83 static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence) 84 { 85 return atomic_read(&fence->pending) <= 0; 86 } 87 88 static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence) 89 { 90 return atomic_read(&fence->pending) < 0; 91 } 92 93 static inline void i915_sw_fence_wait(struct i915_sw_fence *fence) 94 { 95 wait_event(fence->wait, i915_sw_fence_done(fence)); 96 } 97 98 #endif /* _I915_SW_FENCE_H_ */ 99