1 /* 2 * Copyright (c) 2014-2016 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 #ifndef __INTEL_FRONTBUFFER_H__ 25 #define __INTEL_FRONTBUFFER_H__ 26 27 #include <linux/atomic.h> 28 #include <linux/bits.h> 29 #include <linux/kref.h> 30 31 #include "i915_active_types.h" 32 33 struct drm_i915_private; 34 35 enum fb_op_origin { 36 ORIGIN_CPU = 0, 37 ORIGIN_CS, 38 ORIGIN_FLIP, 39 ORIGIN_DIRTYFB, 40 ORIGIN_CURSOR_UPDATE, 41 }; 42 43 struct intel_frontbuffer { 44 struct kref ref; 45 atomic_t bits; 46 struct i915_active write; 47 struct drm_i915_gem_object *obj; 48 struct rcu_head rcu; 49 }; 50 51 /* 52 * Frontbuffer tracking bits. Set in obj->frontbuffer_bits while a gem bo is 53 * considered to be the frontbuffer for the given plane interface-wise. This 54 * doesn't mean that the hw necessarily already scans it out, but that any 55 * rendering (by the cpu or gpu) will land in the frontbuffer eventually. 56 * 57 * We have one bit per pipe and per scanout plane type. 58 */ 59 #define INTEL_FRONTBUFFER_BITS_PER_PIPE 8 60 #define INTEL_FRONTBUFFER(pipe, plane_id) \ 61 BIT((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)); 62 #define INTEL_FRONTBUFFER_OVERLAY(pipe) \ 63 BIT(INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)) 64 #define INTEL_FRONTBUFFER_ALL_MASK(pipe) \ 65 GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1) - 1, \ 66 INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)) 67 68 void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915, 69 unsigned frontbuffer_bits); 70 void intel_frontbuffer_flip_complete(struct drm_i915_private *i915, 71 unsigned frontbuffer_bits); 72 void intel_frontbuffer_flip(struct drm_i915_private *i915, 73 unsigned frontbuffer_bits); 74 75 void intel_frontbuffer_put(struct intel_frontbuffer *front); 76 77 struct intel_frontbuffer * 78 intel_frontbuffer_get(struct drm_i915_gem_object *obj); 79 80 void __intel_fb_invalidate(struct intel_frontbuffer *front, 81 enum fb_op_origin origin, 82 unsigned int frontbuffer_bits); 83 84 /** 85 * intel_frontbuffer_invalidate - invalidate frontbuffer object 86 * @front: GEM object to invalidate 87 * @origin: which operation caused the invalidation 88 * 89 * This function gets called every time rendering on the given object starts and 90 * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must 91 * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed 92 * until the rendering completes or a flip on this frontbuffer plane is 93 * scheduled. 94 */ 95 static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front, 96 enum fb_op_origin origin) 97 { 98 unsigned int frontbuffer_bits; 99 100 if (!front) 101 return false; 102 103 frontbuffer_bits = atomic_read(&front->bits); 104 if (!frontbuffer_bits) 105 return false; 106 107 __intel_fb_invalidate(front, origin, frontbuffer_bits); 108 return true; 109 } 110 111 void __intel_fb_flush(struct intel_frontbuffer *front, 112 enum fb_op_origin origin, 113 unsigned int frontbuffer_bits); 114 115 /** 116 * intel_frontbuffer_flush - flush frontbuffer object 117 * @front: GEM object to flush 118 * @origin: which operation caused the flush 119 * 120 * This function gets called every time rendering on the given object has 121 * completed and frontbuffer caching can be started again. 122 */ 123 static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front, 124 enum fb_op_origin origin) 125 { 126 unsigned int frontbuffer_bits; 127 128 if (!front) 129 return; 130 131 frontbuffer_bits = atomic_read(&front->bits); 132 if (!frontbuffer_bits) 133 return; 134 135 __intel_fb_flush(front, origin, frontbuffer_bits); 136 } 137 138 void intel_frontbuffer_track(struct intel_frontbuffer *old, 139 struct intel_frontbuffer *new, 140 unsigned int frontbuffer_bits); 141 142 #endif /* __INTEL_FRONTBUFFER_H__ */ 143