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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/kref.h>
29
30#include "gem/i915_gem_object_types.h"
31#include "i915_active.h"
32
33struct drm_i915_private;
34
35enum fb_op_origin {
36 ORIGIN_GTT,
37 ORIGIN_CPU,
38 ORIGIN_CS,
39 ORIGIN_FLIP,
40 ORIGIN_DIRTYFB,
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
51void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915,
52 unsigned frontbuffer_bits);
53void intel_frontbuffer_flip_complete(struct drm_i915_private *i915,
54 unsigned frontbuffer_bits);
55void intel_frontbuffer_flip(struct drm_i915_private *i915,
56 unsigned frontbuffer_bits);
57
58void intel_frontbuffer_put(struct intel_frontbuffer *front);
59
60static inline struct intel_frontbuffer *
61__intel_frontbuffer_get(const struct drm_i915_gem_object *obj)
62{
63 struct intel_frontbuffer *front;
64
65 if (likely(!rcu_access_pointer(obj->frontbuffer)))
66 return NULL;
67
68 rcu_read_lock();
69 do {
70 front = rcu_dereference(obj->frontbuffer);
71 if (!front)
72 break;
73
74 if (unlikely(!kref_get_unless_zero(&front->ref)))
75 continue;
76
77 if (likely(front == rcu_access_pointer(obj->frontbuffer)))
78 break;
79
80 intel_frontbuffer_put(front);
81 } while (1);
82 rcu_read_unlock();
83
84 return front;
85}
86
87struct intel_frontbuffer *
88intel_frontbuffer_get(struct drm_i915_gem_object *obj);
89
90void __intel_fb_invalidate(struct intel_frontbuffer *front,
91 enum fb_op_origin origin,
92 unsigned int frontbuffer_bits);
93
94/**
95 * intel_frontbuffer_invalidate - invalidate frontbuffer object
96 * @front: GEM object to invalidate
97 * @origin: which operation caused the invalidation
98 *
99 * This function gets called every time rendering on the given object starts and
100 * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
101 * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed
102 * until the rendering completes or a flip on this frontbuffer plane is
103 * scheduled.
104 */
105static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front,
106 enum fb_op_origin origin)
107{
108 unsigned int frontbuffer_bits;
109
110 if (!front)
111 return false;
112
113 frontbuffer_bits = atomic_read(&front->bits);
114 if (!frontbuffer_bits)
115 return false;
116
117 __intel_fb_invalidate(front, origin, frontbuffer_bits);
118 return true;
119}
120
121void __intel_fb_flush(struct intel_frontbuffer *front,
122 enum fb_op_origin origin,
123 unsigned int frontbuffer_bits);
124
125/**
126 * intel_frontbuffer_flush - flush frontbuffer object
127 * @front: GEM object to flush
128 * @origin: which operation caused the flush
129 *
130 * This function gets called every time rendering on the given object has
131 * completed and frontbuffer caching can be started again.
132 */
133static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front,
134 enum fb_op_origin origin)
135{
136 unsigned int frontbuffer_bits;
137
138 if (!front)
139 return;
140
141 frontbuffer_bits = atomic_read(&front->bits);
142 if (!frontbuffer_bits)
143 return;
144
145 __intel_fb_flush(front, origin, frontbuffer_bits);
146}
147
148void intel_frontbuffer_track(struct intel_frontbuffer *old,
149 struct intel_frontbuffer *new,
150 unsigned int frontbuffer_bits);
151
152#endif /* __INTEL_FRONTBUFFER_H__ */
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 "gem/i915_gem_object_types.h"
32#include "i915_active_types.h"
33
34struct drm_i915_private;
35
36enum fb_op_origin {
37 ORIGIN_CPU = 0,
38 ORIGIN_CS,
39 ORIGIN_FLIP,
40 ORIGIN_DIRTYFB,
41 ORIGIN_CURSOR_UPDATE,
42};
43
44struct intel_frontbuffer {
45 struct kref ref;
46 atomic_t bits;
47 struct i915_active write;
48 struct drm_i915_gem_object *obj;
49 struct rcu_head rcu;
50};
51
52/*
53 * Frontbuffer tracking bits. Set in obj->frontbuffer_bits while a gem bo is
54 * considered to be the frontbuffer for the given plane interface-wise. This
55 * doesn't mean that the hw necessarily already scans it out, but that any
56 * rendering (by the cpu or gpu) will land in the frontbuffer eventually.
57 *
58 * We have one bit per pipe and per scanout plane type.
59 */
60#define INTEL_FRONTBUFFER_BITS_PER_PIPE 8
61#define INTEL_FRONTBUFFER(pipe, plane_id) \
62 BIT((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe));
63#define INTEL_FRONTBUFFER_OVERLAY(pipe) \
64 BIT(INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
65#define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
66 GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1) - 1, \
67 INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
68
69void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915,
70 unsigned frontbuffer_bits);
71void intel_frontbuffer_flip_complete(struct drm_i915_private *i915,
72 unsigned frontbuffer_bits);
73void intel_frontbuffer_flip(struct drm_i915_private *i915,
74 unsigned frontbuffer_bits);
75
76void intel_frontbuffer_put(struct intel_frontbuffer *front);
77
78static inline struct intel_frontbuffer *
79__intel_frontbuffer_get(const struct drm_i915_gem_object *obj)
80{
81 struct intel_frontbuffer *front;
82
83 if (likely(!rcu_access_pointer(obj->frontbuffer)))
84 return NULL;
85
86 rcu_read_lock();
87 do {
88 front = rcu_dereference(obj->frontbuffer);
89 if (!front)
90 break;
91
92 if (unlikely(!kref_get_unless_zero(&front->ref)))
93 continue;
94
95 if (likely(front == rcu_access_pointer(obj->frontbuffer)))
96 break;
97
98 intel_frontbuffer_put(front);
99 } while (1);
100 rcu_read_unlock();
101
102 return front;
103}
104
105struct intel_frontbuffer *
106intel_frontbuffer_get(struct drm_i915_gem_object *obj);
107
108void __intel_fb_invalidate(struct intel_frontbuffer *front,
109 enum fb_op_origin origin,
110 unsigned int frontbuffer_bits);
111
112/**
113 * intel_frontbuffer_invalidate - invalidate frontbuffer object
114 * @front: GEM object to invalidate
115 * @origin: which operation caused the invalidation
116 *
117 * This function gets called every time rendering on the given object starts and
118 * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
119 * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed
120 * until the rendering completes or a flip on this frontbuffer plane is
121 * scheduled.
122 */
123static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front,
124 enum fb_op_origin origin)
125{
126 unsigned int frontbuffer_bits;
127
128 if (!front)
129 return false;
130
131 frontbuffer_bits = atomic_read(&front->bits);
132 if (!frontbuffer_bits)
133 return false;
134
135 __intel_fb_invalidate(front, origin, frontbuffer_bits);
136 return true;
137}
138
139void __intel_fb_flush(struct intel_frontbuffer *front,
140 enum fb_op_origin origin,
141 unsigned int frontbuffer_bits);
142
143/**
144 * intel_frontbuffer_flush - flush frontbuffer object
145 * @front: GEM object to flush
146 * @origin: which operation caused the flush
147 *
148 * This function gets called every time rendering on the given object has
149 * completed and frontbuffer caching can be started again.
150 */
151static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front,
152 enum fb_op_origin origin)
153{
154 unsigned int frontbuffer_bits;
155
156 if (!front)
157 return;
158
159 frontbuffer_bits = atomic_read(&front->bits);
160 if (!frontbuffer_bits)
161 return;
162
163 __intel_fb_flush(front, origin, frontbuffer_bits);
164}
165
166void intel_frontbuffer_track(struct intel_frontbuffer *old,
167 struct intel_frontbuffer *new,
168 unsigned int frontbuffer_bits);
169
170#endif /* __INTEL_FRONTBUFFER_H__ */