1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 */ 24 25 #ifndef I915_GEM_TIMELINE_H 26 #define I915_GEM_TIMELINE_H 27 28 #include <linux/list.h> 29 30 #include "i915_utils.h" 31 #include "i915_gem_request.h" 32 #include "i915_syncmap.h" 33 34 struct i915_gem_timeline; 35 36 struct intel_timeline { 37 u64 fence_context; 38 u32 seqno; 39 40 /** 41 * Count of outstanding requests, from the time they are constructed 42 * to the moment they are retired. Loosely coupled to hardware. 43 */ 44 u32 inflight_seqnos; 45 46 spinlock_t lock; 47 48 /** 49 * List of breadcrumbs associated with GPU requests currently 50 * outstanding. 51 */ 52 struct list_head requests; 53 54 /* Contains an RCU guarded pointer to the last request. No reference is 55 * held to the request, users must carefully acquire a reference to 56 * the request using i915_gem_active_get_request_rcu(), or hold the 57 * struct_mutex. 58 */ 59 struct i915_gem_active last_request; 60 61 /** 62 * We track the most recent seqno that we wait on in every context so 63 * that we only have to emit a new await and dependency on a more 64 * recent sync point. As the contexts may be executed out-of-order, we 65 * have to track each individually and can not rely on an absolute 66 * global_seqno. When we know that all tracked fences are completed 67 * (i.e. when the driver is idle), we know that the syncmap is 68 * redundant and we can discard it without loss of generality. 69 */ 70 struct i915_syncmap *sync; 71 /** 72 * Separately to the inter-context seqno map above, we track the last 73 * barrier (e.g. semaphore wait) to the global engine timelines. Note 74 * that this tracks global_seqno rather than the context.seqno, and 75 * so it is subject to the limitations of hw wraparound and that we 76 * may need to revoke global_seqno (on pre-emption). 77 */ 78 u32 global_sync[I915_NUM_ENGINES]; 79 80 struct i915_gem_timeline *common; 81 }; 82 83 struct i915_gem_timeline { 84 struct list_head link; 85 86 struct drm_i915_private *i915; 87 const char *name; 88 89 struct intel_timeline engine[I915_NUM_ENGINES]; 90 }; 91 92 int i915_gem_timeline_init(struct drm_i915_private *i915, 93 struct i915_gem_timeline *tl, 94 const char *name); 95 int i915_gem_timeline_init__global(struct drm_i915_private *i915); 96 void i915_gem_timelines_mark_idle(struct drm_i915_private *i915); 97 void i915_gem_timeline_fini(struct i915_gem_timeline *tl); 98 99 static inline int __intel_timeline_sync_set(struct intel_timeline *tl, 100 u64 context, u32 seqno) 101 { 102 return i915_syncmap_set(&tl->sync, context, seqno); 103 } 104 105 static inline int intel_timeline_sync_set(struct intel_timeline *tl, 106 const struct dma_fence *fence) 107 { 108 return __intel_timeline_sync_set(tl, fence->context, fence->seqno); 109 } 110 111 static inline bool __intel_timeline_sync_is_later(struct intel_timeline *tl, 112 u64 context, u32 seqno) 113 { 114 return i915_syncmap_is_later(&tl->sync, context, seqno); 115 } 116 117 static inline bool intel_timeline_sync_is_later(struct intel_timeline *tl, 118 const struct dma_fence *fence) 119 { 120 return __intel_timeline_sync_is_later(tl, fence->context, fence->seqno); 121 } 122 123 #endif 124