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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
31struct drm_device;
32struct drm_gem_object;
33struct intel_display;
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 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
66void intel_frontbuffer_flip(struct intel_display *display,
67 unsigned frontbuffer_bits);
68
69void __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 */
84static 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
100void __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 */
112static 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
127void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front);
128
129void intel_frontbuffer_track(struct intel_frontbuffer *old,
130 struct intel_frontbuffer *new,
131 unsigned int frontbuffer_bits);
132
133void intel_frontbuffer_init(struct intel_frontbuffer *front, struct drm_device *drm);
134void intel_frontbuffer_fini(struct intel_frontbuffer *front);
135
136#endif /* __INTEL_FRONTBUFFER_H__ */