2 * Copyright (c) 2014-2016 Intel Corporation
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:
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
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
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24 #ifndef __INTEL_FRONTBUFFER_H__
25 #define __INTEL_FRONTBUFFER_H__
27 #include <linux/atomic.h>
28 #include <linux/bits.h>
29 #include <linux/kref.h>
31 #include "i915_active_types.h"
33 struct drm_i915_private;
43 struct intel_frontbuffer {
46 struct i915_active write;
47 struct drm_i915_gem_object *obj;
50 struct work_struct flush_work;
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.
59 * We have one bit per pipe and per scanout plane type.
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))
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);
77 void intel_frontbuffer_put(struct intel_frontbuffer *front);
79 struct intel_frontbuffer *
80 intel_frontbuffer_get(struct drm_i915_gem_object *obj);
82 void __intel_fb_invalidate(struct intel_frontbuffer *front,
83 enum fb_op_origin origin,
84 unsigned int frontbuffer_bits);
87 * intel_frontbuffer_invalidate - invalidate frontbuffer object
88 * @front: GEM object to invalidate
89 * @origin: which operation caused the invalidation
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
97 static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front,
98 enum fb_op_origin origin)
100 unsigned int frontbuffer_bits;
105 frontbuffer_bits = atomic_read(&front->bits);
106 if (!frontbuffer_bits)
109 __intel_fb_invalidate(front, origin, frontbuffer_bits);
113 void __intel_fb_flush(struct intel_frontbuffer *front,
114 enum fb_op_origin origin,
115 unsigned int frontbuffer_bits);
118 * intel_frontbuffer_flush - flush frontbuffer object
119 * @front: GEM object to flush
120 * @origin: which operation caused the flush
122 * This function gets called every time rendering on the given object has
123 * completed and frontbuffer caching can be started again.
125 static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front,
126 enum fb_op_origin origin)
128 unsigned int frontbuffer_bits;
133 frontbuffer_bits = atomic_read(&front->bits);
134 if (!frontbuffer_bits)
137 __intel_fb_flush(front, origin, frontbuffer_bits);
140 void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front);
142 void intel_frontbuffer_track(struct intel_frontbuffer *old,
143 struct intel_frontbuffer *new,
144 unsigned int frontbuffer_bits);
146 #endif /* __INTEL_FRONTBUFFER_H__ */