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/gfp.h> 13 #include <linux/kref.h> 14 #include <linux/notifier.h> /* for NOTIFY_DONE */ 15 #include <linux/wait.h> 16 17 struct completion; 18 struct dma_fence; 19 struct dma_fence_ops; 20 struct reservation_object; 21 22 struct i915_sw_fence { 23 wait_queue_head_t wait; 24 unsigned long flags; 25 atomic_t pending; 26 }; 27 28 #define I915_SW_FENCE_CHECKED_BIT 0 /* used internally for DAG checking */ 29 #define I915_SW_FENCE_PRIVATE_BIT 1 /* available for use by owner */ 30 #define I915_SW_FENCE_MASK (~3) 31 32 enum i915_sw_fence_notify { 33 FENCE_COMPLETE, 34 FENCE_FREE 35 }; 36 37 typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *, 38 enum i915_sw_fence_notify state); 39 #define __i915_sw_fence_call __aligned(4) 40 41 void __i915_sw_fence_init(struct i915_sw_fence *fence, 42 i915_sw_fence_notify_t fn, 43 const char *name, 44 struct lock_class_key *key); 45 #ifdef CONFIG_LOCKDEP 46 #define i915_sw_fence_init(fence, fn) \ 47 do { \ 48 static struct lock_class_key __key; \ 49 \ 50 __i915_sw_fence_init((fence), (fn), #fence, &__key); \ 51 } while (0) 52 #else 53 #define i915_sw_fence_init(fence, fn) \ 54 __i915_sw_fence_init((fence), (fn), NULL, NULL) 55 #endif 56 57 #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS 58 void i915_sw_fence_fini(struct i915_sw_fence *fence); 59 #else 60 static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {} 61 #endif 62 63 void i915_sw_fence_commit(struct i915_sw_fence *fence); 64 65 int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence, 66 struct i915_sw_fence *after, 67 wait_queue_entry_t *wq); 68 int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence, 69 struct i915_sw_fence *after, 70 gfp_t gfp); 71 int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence, 72 struct dma_fence *dma, 73 unsigned long timeout, 74 gfp_t gfp); 75 int i915_sw_fence_await_reservation(struct i915_sw_fence *fence, 76 struct reservation_object *resv, 77 const struct dma_fence_ops *exclude, 78 bool write, 79 unsigned long timeout, 80 gfp_t gfp); 81 82 static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence) 83 { 84 return atomic_read(&fence->pending) <= 0; 85 } 86 87 static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence) 88 { 89 return atomic_read(&fence->pending) < 0; 90 } 91 92 static inline void i915_sw_fence_wait(struct i915_sw_fence *fence) 93 { 94 wait_event(fence->wait, i915_sw_fence_done(fence)); 95 } 96 97 #endif /* _I915_SW_FENCE_H_ */ 98