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 struct work_struct flush_work; 51 }; 52 53 /* 54 * Frontbuffer tracking bits. Set in obj->frontbuffer_bits while a gem bo is 55 * considered to be the frontbuffer for the given plane interface-wise. This 56 * doesn't mean that the hw necessarily already scans it out, but that any 57 * rendering (by the cpu or gpu) will land in the frontbuffer eventually. 58 * 59 * We have one bit per pipe and per scanout plane type. 60 */ 61 #define INTEL_FRONTBUFFER_BITS_PER_PIPE 8 62 #define INTEL_FRONTBUFFER(pipe, plane_id) \ 63 BIT((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)); 64 #define INTEL_FRONTBUFFER_OVERLAY(pipe) \ 65 BIT(INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)) 66 #define INTEL_FRONTBUFFER_ALL_MASK(pipe) \ 67 GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1) - 1, \ 68 INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)) 69 70 void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915, 71 unsigned frontbuffer_bits); 72 void intel_frontbuffer_flip_complete(struct drm_i915_private *i915, 73 unsigned frontbuffer_bits); 74 void intel_frontbuffer_flip(struct drm_i915_private *i915, 75 unsigned frontbuffer_bits); 76 77 void intel_frontbuffer_put(struct intel_frontbuffer *front); 78 79 struct intel_frontbuffer * 80 intel_frontbuffer_get(struct drm_i915_gem_object *obj); 81 82 void __intel_fb_invalidate(struct intel_frontbuffer *front, 83 enum fb_op_origin origin, 84 unsigned int frontbuffer_bits); 85 86 /** 87 * intel_frontbuffer_invalidate - invalidate frontbuffer object 88 * @front: GEM object to invalidate 89 * @origin: which operation caused the invalidation 90 * 91 * This function gets called every time rendering on the given object starts and 92 * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must 93 * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed 94 * until the rendering completes or a flip on this frontbuffer plane is 95 * scheduled. 96 */ 97 static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front, 98 enum fb_op_origin origin) 99 { 100 unsigned int frontbuffer_bits; 101 102 if (!front) 103 return false; 104 105 frontbuffer_bits = atomic_read(&front->bits); 106 if (!frontbuffer_bits) 107 return false; 108 109 __intel_fb_invalidate(front, origin, frontbuffer_bits); 110 return true; 111 } 112 113 void __intel_fb_flush(struct intel_frontbuffer *front, 114 enum fb_op_origin origin, 115 unsigned int frontbuffer_bits); 116 117 /** 118 * intel_frontbuffer_flush - flush frontbuffer object 119 * @front: GEM object to flush 120 * @origin: which operation caused the flush 121 * 122 * This function gets called every time rendering on the given object has 123 * completed and frontbuffer caching can be started again. 124 */ 125 static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front, 126 enum fb_op_origin origin) 127 { 128 unsigned int frontbuffer_bits; 129 130 if (!front) 131 return; 132 133 frontbuffer_bits = atomic_read(&front->bits); 134 if (!frontbuffer_bits) 135 return; 136 137 __intel_fb_flush(front, origin, frontbuffer_bits); 138 } 139 140 void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front); 141 142 void intel_frontbuffer_track(struct intel_frontbuffer *old, 143 struct intel_frontbuffer *new, 144 unsigned int frontbuffer_bits); 145 146 #endif /* __INTEL_FRONTBUFFER_H__ */ 147