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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" | |
66 | #include "i915_drv.h" | |
67 | ||
b680c37a DV |
68 | /** |
69 | * intel_fb_obj_invalidate - invalidate frontbuffer object | |
70 | * @obj: GEM object to invalidate | |
a4001f1b | 71 | * @origin: which operation caused the invalidation |
b680c37a DV |
72 | * |
73 | * This function gets called every time rendering on the given object starts and | |
74 | * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must | |
77a0d1ca | 75 | * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed |
b680c37a DV |
76 | * until the rendering completes or a flip on this frontbuffer plane is |
77 | * scheduled. | |
78 | */ | |
79 | void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj, | |
a4001f1b | 80 | enum fb_op_origin origin) |
b680c37a DV |
81 | { |
82 | struct drm_device *dev = obj->base.dev; | |
9fb73863 | 83 | struct drm_i915_private *dev_priv = to_i915(dev); |
b680c37a DV |
84 | |
85 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
86 | ||
87 | if (!obj->frontbuffer_bits) | |
88 | return; | |
89 | ||
77a0d1ca | 90 | if (origin == ORIGIN_CS) { |
b680c37a DV |
91 | mutex_lock(&dev_priv->fb_tracking.lock); |
92 | dev_priv->fb_tracking.busy_bits | |
93 | |= obj->frontbuffer_bits; | |
94 | dev_priv->fb_tracking.flip_bits | |
95 | &= ~obj->frontbuffer_bits; | |
96 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
97 | } | |
98 | ||
0bc12bcb | 99 | intel_psr_invalidate(dev, obj->frontbuffer_bits); |
a93fad0f | 100 | intel_edp_drrs_invalidate(dev, obj->frontbuffer_bits); |
dbef0f15 | 101 | intel_fbc_invalidate(dev_priv, obj->frontbuffer_bits, origin); |
b680c37a DV |
102 | } |
103 | ||
104 | /** | |
105 | * intel_frontbuffer_flush - flush frontbuffer | |
106 | * @dev: DRM device | |
107 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
de152b62 | 108 | * @origin: which operation caused the flush |
b680c37a DV |
109 | * |
110 | * This function gets called every time rendering on the given planes has | |
111 | * completed and frontbuffer caching can be started again. Flushes will get | |
5c323b2a | 112 | * delayed if they're blocked by some outstanding asynchronous rendering. |
b680c37a DV |
113 | * |
114 | * Can be called without any locks held. | |
115 | */ | |
b6c2aa51 PZ |
116 | static void intel_frontbuffer_flush(struct drm_device *dev, |
117 | unsigned frontbuffer_bits, | |
118 | enum fb_op_origin origin) | |
b680c37a | 119 | { |
9fb73863 | 120 | struct drm_i915_private *dev_priv = to_i915(dev); |
b680c37a DV |
121 | |
122 | /* Delay flushing when rings are still busy.*/ | |
123 | mutex_lock(&dev_priv->fb_tracking.lock); | |
124 | frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits; | |
125 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
126 | ||
27e78a2a DV |
127 | if (!frontbuffer_bits) |
128 | return; | |
129 | ||
a93fad0f | 130 | intel_edp_drrs_flush(dev, frontbuffer_bits); |
169de131 | 131 | intel_psr_flush(dev, frontbuffer_bits, origin); |
6f4551fe | 132 | intel_fbc_flush(dev_priv, frontbuffer_bits, origin); |
b680c37a DV |
133 | } |
134 | ||
135 | /** | |
136 | * intel_fb_obj_flush - flush frontbuffer object | |
137 | * @obj: GEM object to flush | |
138 | * @retire: set when retiring asynchronous rendering | |
76f2e13d | 139 | * @origin: which operation caused the flush |
b680c37a DV |
140 | * |
141 | * This function gets called every time rendering on the given object has | |
142 | * completed and frontbuffer caching can be started again. If @retire is true | |
143 | * then any delayed flushes will be unblocked. | |
144 | */ | |
145 | void intel_fb_obj_flush(struct drm_i915_gem_object *obj, | |
de152b62 | 146 | bool retire, enum fb_op_origin origin) |
b680c37a DV |
147 | { |
148 | struct drm_device *dev = obj->base.dev; | |
9fb73863 | 149 | struct drm_i915_private *dev_priv = to_i915(dev); |
b680c37a DV |
150 | unsigned frontbuffer_bits; |
151 | ||
152 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
153 | ||
154 | if (!obj->frontbuffer_bits) | |
155 | return; | |
156 | ||
157 | frontbuffer_bits = obj->frontbuffer_bits; | |
158 | ||
159 | if (retire) { | |
160 | mutex_lock(&dev_priv->fb_tracking.lock); | |
161 | /* Filter out new bits since rendering started. */ | |
162 | frontbuffer_bits &= dev_priv->fb_tracking.busy_bits; | |
163 | ||
164 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
165 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
166 | } | |
167 | ||
de152b62 | 168 | intel_frontbuffer_flush(dev, frontbuffer_bits, origin); |
b680c37a DV |
169 | } |
170 | ||
171 | /** | |
5c323b2a | 172 | * intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip |
b680c37a DV |
173 | * @dev: DRM device |
174 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
175 | * | |
176 | * This function gets called after scheduling a flip on @obj. The actual | |
177 | * frontbuffer flushing will be delayed until completion is signalled with | |
178 | * intel_frontbuffer_flip_complete. If an invalidate happens in between this | |
179 | * flush will be cancelled. | |
180 | * | |
181 | * Can be called without any locks held. | |
182 | */ | |
183 | void intel_frontbuffer_flip_prepare(struct drm_device *dev, | |
184 | unsigned frontbuffer_bits) | |
185 | { | |
9fb73863 | 186 | struct drm_i915_private *dev_priv = to_i915(dev); |
b680c37a DV |
187 | |
188 | mutex_lock(&dev_priv->fb_tracking.lock); | |
11c9b6c6 DV |
189 | dev_priv->fb_tracking.flip_bits |= frontbuffer_bits; |
190 | /* Remove stale busy bits due to the old buffer. */ | |
191 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
b680c37a | 192 | mutex_unlock(&dev_priv->fb_tracking.lock); |
c7240c3b | 193 | |
20c8838b | 194 | intel_psr_single_frame_update(dev, frontbuffer_bits); |
b680c37a DV |
195 | } |
196 | ||
197 | /** | |
5c323b2a | 198 | * intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip |
b680c37a DV |
199 | * @dev: DRM device |
200 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
201 | * | |
202 | * This function gets called after the flip has been latched and will complete | |
5c323b2a | 203 | * on the next vblank. It will execute the flush if it hasn't been cancelled yet. |
b680c37a DV |
204 | * |
205 | * Can be called without any locks held. | |
206 | */ | |
207 | void intel_frontbuffer_flip_complete(struct drm_device *dev, | |
208 | unsigned frontbuffer_bits) | |
209 | { | |
9fb73863 | 210 | struct drm_i915_private *dev_priv = to_i915(dev); |
b680c37a DV |
211 | |
212 | mutex_lock(&dev_priv->fb_tracking.lock); | |
213 | /* Mask any cancelled flips. */ | |
214 | frontbuffer_bits &= dev_priv->fb_tracking.flip_bits; | |
215 | dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits; | |
216 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
217 | ||
de152b62 | 218 | intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP); |
b680c37a | 219 | } |
fdbff928 DV |
220 | |
221 | /** | |
222 | * intel_frontbuffer_flip - synchronous frontbuffer flip | |
223 | * @dev: DRM device | |
224 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
225 | * | |
226 | * This function gets called after scheduling a flip on @obj. This is for | |
227 | * synchronous plane updates which will happen on the next vblank and which will | |
228 | * not get delayed by pending gpu rendering. | |
229 | * | |
230 | * Can be called without any locks held. | |
231 | */ | |
fdbff928 DV |
232 | void intel_frontbuffer_flip(struct drm_device *dev, |
233 | unsigned frontbuffer_bits) | |
234 | { | |
9fb73863 | 235 | struct drm_i915_private *dev_priv = to_i915(dev); |
fdbff928 DV |
236 | |
237 | mutex_lock(&dev_priv->fb_tracking.lock); | |
238 | /* Remove stale busy bits due to the old buffer. */ | |
239 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
240 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
241 | ||
de152b62 | 242 | intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP); |
fdbff928 | 243 | } |