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/workqueue_types.h> 30 31 struct drm_device; 32 struct drm_gem_object; 33 struct intel_display; 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 intel_display *display; 45 atomic_t bits; 46 struct work_struct flush_work; 47 }; 48 49 /* 50 * Frontbuffer tracking bits. Set in obj->frontbuffer_bits while a gem bo is 51 * considered to be the frontbuffer for the given plane interface-wise. This 52 * doesn't mean that the hw necessarily already scans it out, but that any 53 * rendering (by the cpu or gpu) will land in the frontbuffer eventually. 54 * 55 * We have one bit per pipe and per scanout plane type. 56 */ 57 #define INTEL_FRONTBUFFER_BITS_PER_PIPE 8 58 #define INTEL_FRONTBUFFER(pipe, plane_id) \ 59 BIT((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)); 60 #define INTEL_FRONTBUFFER_OVERLAY(pipe) \ 61 BIT(INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)) 62 #define INTEL_FRONTBUFFER_ALL_MASK(pipe) \ 63 GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1) - 1, \ 64 INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)) 65 66 void intel_frontbuffer_flip(struct intel_display *display, 67 unsigned frontbuffer_bits); 68 69 void __intel_frontbuffer_invalidate(struct intel_frontbuffer *front, 70 enum fb_op_origin origin, 71 unsigned int frontbuffer_bits); 72 73 /** 74 * intel_frontbuffer_invalidate - invalidate frontbuffer object 75 * @front: GEM object to invalidate 76 * @origin: which operation caused the invalidation 77 * 78 * This function gets called every time rendering on the given object starts and 79 * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must 80 * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed 81 * until the rendering completes or a flip on this frontbuffer plane is 82 * scheduled. 83 */ 84 static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front, 85 enum fb_op_origin origin) 86 { 87 unsigned int frontbuffer_bits; 88 89 if (!front) 90 return false; 91 92 frontbuffer_bits = atomic_read(&front->bits); 93 if (!frontbuffer_bits) 94 return false; 95 96 __intel_frontbuffer_invalidate(front, origin, frontbuffer_bits); 97 return true; 98 } 99 100 void __intel_frontbuffer_flush(struct intel_frontbuffer *front, 101 enum fb_op_origin origin, 102 unsigned int frontbuffer_bits); 103 104 /** 105 * intel_frontbuffer_flush - flush frontbuffer object 106 * @front: GEM object to flush 107 * @origin: which operation caused the flush 108 * 109 * This function gets called every time rendering on the given object has 110 * completed and frontbuffer caching can be started again. 111 */ 112 static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front, 113 enum fb_op_origin origin) 114 { 115 unsigned int frontbuffer_bits; 116 117 if (!front) 118 return; 119 120 frontbuffer_bits = atomic_read(&front->bits); 121 if (!frontbuffer_bits) 122 return; 123 124 __intel_frontbuffer_flush(front, origin, frontbuffer_bits); 125 } 126 127 void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front); 128 129 void intel_frontbuffer_track(struct intel_frontbuffer *old, 130 struct intel_frontbuffer *new, 131 unsigned int frontbuffer_bits); 132 133 void intel_frontbuffer_init(struct intel_frontbuffer *front, struct drm_device *drm); 134 void intel_frontbuffer_fini(struct intel_frontbuffer *front); 135 136 #endif /* __INTEL_FRONTBUFFER_H__ */ 137