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1/*2 * Copyright (c) 2014-2016 Intel Corporation3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice (including the next12 * paragraph) shall be included in all copies or substantial portions of the13 * Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS21 * 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 33struct drm_i915_private;34 35enum fb_op_origin {36 ORIGIN_CPU = 0,37 ORIGIN_CS,38 ORIGIN_FLIP,39 ORIGIN_DIRTYFB,40 ORIGIN_CURSOR_UPDATE,41};42 43struct 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 is55 * considered to be the frontbuffer for the given plane interface-wise. This56 * doesn't mean that the hw necessarily already scans it out, but that any57 * 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 862#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 70void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915,71 unsigned frontbuffer_bits);72void intel_frontbuffer_flip_complete(struct drm_i915_private *i915,73 unsigned frontbuffer_bits);74void intel_frontbuffer_flip(struct drm_i915_private *i915,75 unsigned frontbuffer_bits);76 77void intel_frontbuffer_put(struct intel_frontbuffer *front);78 79struct intel_frontbuffer *80intel_frontbuffer_get(struct drm_i915_gem_object *obj);81 82void __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 object88 * @front: GEM object to invalidate89 * @origin: which operation caused the invalidation90 *91 * This function gets called every time rendering on the given object starts and92 * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must93 * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed94 * until the rendering completes or a flip on this frontbuffer plane is95 * scheduled.96 */97static 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 113void __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 object119 * @front: GEM object to flush120 * @origin: which operation caused the flush121 *122 * This function gets called every time rendering on the given object has123 * completed and frontbuffer caching can be started again.124 */125static 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 140void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front);141 142void intel_frontbuffer_track(struct intel_frontbuffer *old,143 struct intel_frontbuffer *new,144 unsigned int frontbuffer_bits);145 146#endif /* __INTEL_FRONTBUFFER_H__ */147