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b680c37a DV |
1 | /* |
2 | * Copyright © 2014 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 | |
21 | * DEALINGS IN THE SOFTWARE. | |
22 | * | |
23 | * Authors: | |
24 | * Daniel Vetter <daniel.vetter@ffwll.ch> | |
25 | */ | |
26 | ||
27 | /** | |
28 | * DOC: frontbuffer tracking | |
29 | * | |
30 | * Many features require us to track changes to the currently active | |
5c323b2a | 31 | * frontbuffer, especially rendering targeted at the frontbuffer. |
b680c37a DV |
32 | * |
33 | * To be able to do so GEM tracks frontbuffers using a bitmask for all possible | |
34 | * frontbuffer slots through i915_gem_track_fb(). The function in this file are | |
35 | * then called when the contents of the frontbuffer are invalidated, when | |
36 | * frontbuffer rendering has stopped again to flush out all the changes and when | |
37 | * the frontbuffer is exchanged with a flip. Subsystems interested in | |
38 | * frontbuffer changes (e.g. PSR, FBC, DRRS) should directly put their callbacks | |
39 | * into the relevant places and filter for the frontbuffer slots that they are | |
40 | * interested int. | |
41 | * | |
42 | * On a high level there are two types of powersaving features. The first one | |
43 | * work like a special cache (FBC and PSR) and are interested when they should | |
44 | * stop caching and when to restart caching. This is done by placing callbacks | |
45 | * into the invalidate and the flush functions: At invalidate the caching must | |
46 | * be stopped and at flush time it can be restarted. And maybe they need to know | |
47 | * when the frontbuffer changes (e.g. when the hw doesn't initiate an invalidate | |
48 | * and flush on its own) which can be achieved with placing callbacks into the | |
49 | * flip functions. | |
50 | * | |
51 | * The other type of display power saving feature only cares about busyness | |
52 | * (e.g. DRRS). In that case all three (invalidate, flush and flip) indicate | |
53 | * busyness. There is no direct way to detect idleness. Instead an idle timer | |
54 | * work delayed work should be started from the flush and flip functions and | |
55 | * cancelled as soon as busyness is detected. | |
56 | * | |
57 | * Note that there's also an older frontbuffer activity tracking scheme which | |
5c323b2a | 58 | * just tracks general activity. This is done by the various mark_busy and |
b680c37a DV |
59 | * mark_idle functions. For display power management features using these |
60 | * functions is deprecated and should be avoided. | |
61 | */ | |
62 | ||
63 | #include <drm/drmP.h> | |
64 | ||
65 | #include "intel_drv.h" | |
5d723d7a | 66 | #include "intel_frontbuffer.h" |
b680c37a DV |
67 | #include "i915_drv.h" |
68 | ||
b5add959 | 69 | void __intel_fb_obj_invalidate(struct drm_i915_gem_object *obj, |
faf5bf0a CW |
70 | enum fb_op_origin origin, |
71 | unsigned int frontbuffer_bits) | |
b680c37a | 72 | { |
5748b6a1 | 73 | struct drm_i915_private *dev_priv = to_i915(obj->base.dev); |
b680c37a | 74 | |
77a0d1ca | 75 | if (origin == ORIGIN_CS) { |
b5add959 | 76 | spin_lock(&dev_priv->fb_tracking.lock); |
faf5bf0a CW |
77 | dev_priv->fb_tracking.busy_bits |= frontbuffer_bits; |
78 | dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits; | |
b5add959 | 79 | spin_unlock(&dev_priv->fb_tracking.lock); |
b680c37a DV |
80 | } |
81 | ||
5748b6a1 CW |
82 | intel_psr_invalidate(dev_priv, frontbuffer_bits); |
83 | intel_edp_drrs_invalidate(dev_priv, frontbuffer_bits); | |
faf5bf0a | 84 | intel_fbc_invalidate(dev_priv, frontbuffer_bits, origin); |
b680c37a DV |
85 | } |
86 | ||
87 | /** | |
88 | * intel_frontbuffer_flush - flush frontbuffer | |
5748b6a1 | 89 | * @dev_priv: i915 device |
b680c37a | 90 | * @frontbuffer_bits: frontbuffer plane tracking bits |
de152b62 | 91 | * @origin: which operation caused the flush |
b680c37a DV |
92 | * |
93 | * This function gets called every time rendering on the given planes has | |
94 | * completed and frontbuffer caching can be started again. Flushes will get | |
5c323b2a | 95 | * delayed if they're blocked by some outstanding asynchronous rendering. |
b680c37a DV |
96 | * |
97 | * Can be called without any locks held. | |
98 | */ | |
5748b6a1 | 99 | static void intel_frontbuffer_flush(struct drm_i915_private *dev_priv, |
b6c2aa51 PZ |
100 | unsigned frontbuffer_bits, |
101 | enum fb_op_origin origin) | |
b680c37a | 102 | { |
b680c37a | 103 | /* Delay flushing when rings are still busy.*/ |
b5add959 | 104 | spin_lock(&dev_priv->fb_tracking.lock); |
b680c37a | 105 | frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits; |
b5add959 | 106 | spin_unlock(&dev_priv->fb_tracking.lock); |
b680c37a | 107 | |
27e78a2a DV |
108 | if (!frontbuffer_bits) |
109 | return; | |
110 | ||
5748b6a1 CW |
111 | intel_edp_drrs_flush(dev_priv, frontbuffer_bits); |
112 | intel_psr_flush(dev_priv, frontbuffer_bits, origin); | |
6f4551fe | 113 | intel_fbc_flush(dev_priv, frontbuffer_bits, origin); |
b680c37a DV |
114 | } |
115 | ||
b5add959 CW |
116 | void __intel_fb_obj_flush(struct drm_i915_gem_object *obj, |
117 | bool retire, | |
faf5bf0a CW |
118 | enum fb_op_origin origin, |
119 | unsigned int frontbuffer_bits) | |
b680c37a | 120 | { |
5748b6a1 | 121 | struct drm_i915_private *dev_priv = to_i915(obj->base.dev); |
b680c37a DV |
122 | |
123 | if (retire) { | |
b5add959 | 124 | spin_lock(&dev_priv->fb_tracking.lock); |
b680c37a DV |
125 | /* Filter out new bits since rendering started. */ |
126 | frontbuffer_bits &= dev_priv->fb_tracking.busy_bits; | |
b680c37a | 127 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; |
b5add959 | 128 | spin_unlock(&dev_priv->fb_tracking.lock); |
b680c37a DV |
129 | } |
130 | ||
b5add959 | 131 | if (frontbuffer_bits) |
5748b6a1 | 132 | intel_frontbuffer_flush(dev_priv, frontbuffer_bits, origin); |
b680c37a DV |
133 | } |
134 | ||
135 | /** | |
5c323b2a | 136 | * intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip |
5748b6a1 | 137 | * @dev_priv: i915 device |
b680c37a DV |
138 | * @frontbuffer_bits: frontbuffer plane tracking bits |
139 | * | |
140 | * This function gets called after scheduling a flip on @obj. The actual | |
141 | * frontbuffer flushing will be delayed until completion is signalled with | |
142 | * intel_frontbuffer_flip_complete. If an invalidate happens in between this | |
143 | * flush will be cancelled. | |
144 | * | |
145 | * Can be called without any locks held. | |
146 | */ | |
5748b6a1 | 147 | void intel_frontbuffer_flip_prepare(struct drm_i915_private *dev_priv, |
b680c37a DV |
148 | unsigned frontbuffer_bits) |
149 | { | |
b5add959 | 150 | spin_lock(&dev_priv->fb_tracking.lock); |
11c9b6c6 DV |
151 | dev_priv->fb_tracking.flip_bits |= frontbuffer_bits; |
152 | /* Remove stale busy bits due to the old buffer. */ | |
153 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
b5add959 | 154 | spin_unlock(&dev_priv->fb_tracking.lock); |
c7240c3b | 155 | |
5748b6a1 | 156 | intel_psr_single_frame_update(dev_priv, frontbuffer_bits); |
b680c37a DV |
157 | } |
158 | ||
159 | /** | |
5c323b2a | 160 | * intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip |
5748b6a1 | 161 | * @dev_priv: i915 device |
b680c37a DV |
162 | * @frontbuffer_bits: frontbuffer plane tracking bits |
163 | * | |
164 | * This function gets called after the flip has been latched and will complete | |
5c323b2a | 165 | * on the next vblank. It will execute the flush if it hasn't been cancelled yet. |
b680c37a DV |
166 | * |
167 | * Can be called without any locks held. | |
168 | */ | |
5748b6a1 | 169 | void intel_frontbuffer_flip_complete(struct drm_i915_private *dev_priv, |
b680c37a DV |
170 | unsigned frontbuffer_bits) |
171 | { | |
b5add959 | 172 | spin_lock(&dev_priv->fb_tracking.lock); |
b680c37a DV |
173 | /* Mask any cancelled flips. */ |
174 | frontbuffer_bits &= dev_priv->fb_tracking.flip_bits; | |
175 | dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits; | |
b5add959 | 176 | spin_unlock(&dev_priv->fb_tracking.lock); |
b680c37a | 177 | |
b5add959 | 178 | if (frontbuffer_bits) |
5748b6a1 CW |
179 | intel_frontbuffer_flush(dev_priv, |
180 | frontbuffer_bits, ORIGIN_FLIP); | |
b680c37a | 181 | } |
fdbff928 DV |
182 | |
183 | /** | |
184 | * intel_frontbuffer_flip - synchronous frontbuffer flip | |
5748b6a1 | 185 | * @dev_priv: i915 device |
fdbff928 DV |
186 | * @frontbuffer_bits: frontbuffer plane tracking bits |
187 | * | |
188 | * This function gets called after scheduling a flip on @obj. This is for | |
189 | * synchronous plane updates which will happen on the next vblank and which will | |
190 | * not get delayed by pending gpu rendering. | |
191 | * | |
192 | * Can be called without any locks held. | |
193 | */ | |
5748b6a1 | 194 | void intel_frontbuffer_flip(struct drm_i915_private *dev_priv, |
fdbff928 DV |
195 | unsigned frontbuffer_bits) |
196 | { | |
b5add959 | 197 | spin_lock(&dev_priv->fb_tracking.lock); |
fdbff928 DV |
198 | /* Remove stale busy bits due to the old buffer. */ |
199 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
b5add959 | 200 | spin_unlock(&dev_priv->fb_tracking.lock); |
fdbff928 | 201 | |
5748b6a1 | 202 | intel_frontbuffer_flush(dev_priv, frontbuffer_bits, ORIGIN_FLIP); |
fdbff928 | 203 | } |