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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 | ||
68 | static void intel_increase_pllclock(struct drm_device *dev, | |
69 | enum pipe pipe) | |
70 | { | |
71 | struct drm_i915_private *dev_priv = dev->dev_private; | |
72 | int dpll_reg = DPLL(pipe); | |
73 | int dpll; | |
74 | ||
75 | if (!HAS_GMCH_DISPLAY(dev)) | |
76 | return; | |
77 | ||
78 | if (!dev_priv->lvds_downclock_avail) | |
79 | return; | |
80 | ||
81 | dpll = I915_READ(dpll_reg); | |
82 | if (!HAS_PIPE_CXSR(dev) && (dpll & DISPLAY_RATE_SELECT_FPA1)) { | |
83 | DRM_DEBUG_DRIVER("upclocking LVDS\n"); | |
84 | ||
85 | assert_panel_unlocked(dev_priv, pipe); | |
86 | ||
87 | dpll &= ~DISPLAY_RATE_SELECT_FPA1; | |
88 | I915_WRITE(dpll_reg, dpll); | |
89 | intel_wait_for_vblank(dev, pipe); | |
90 | ||
91 | dpll = I915_READ(dpll_reg); | |
92 | if (dpll & DISPLAY_RATE_SELECT_FPA1) | |
93 | DRM_DEBUG_DRIVER("failed to upclock LVDS!\n"); | |
94 | } | |
95 | } | |
96 | ||
97 | /** | |
98 | * intel_mark_fb_busy - mark given planes as busy | |
99 | * @dev: DRM device | |
100 | * @frontbuffer_bits: bits for the affected planes | |
101 | * @ring: optional ring for asynchronous commands | |
102 | * | |
103 | * This function gets called every time the screen contents change. It can be | |
104 | * used to keep e.g. the update rate at the nominal refresh rate with DRRS. | |
105 | */ | |
106 | static void intel_mark_fb_busy(struct drm_device *dev, | |
107 | unsigned frontbuffer_bits, | |
108 | struct intel_engine_cs *ring) | |
109 | { | |
110 | struct drm_i915_private *dev_priv = dev->dev_private; | |
111 | enum pipe pipe; | |
112 | ||
113 | if (!i915.powersave) | |
114 | return; | |
115 | ||
116 | for_each_pipe(dev_priv, pipe) { | |
117 | if (!(frontbuffer_bits & INTEL_FRONTBUFFER_ALL_MASK(pipe))) | |
118 | continue; | |
119 | ||
120 | intel_increase_pllclock(dev, pipe); | |
121 | if (ring && intel_fbc_enabled(dev)) | |
122 | ring->fbc_dirty = true; | |
123 | } | |
124 | } | |
125 | ||
126 | /** | |
127 | * intel_fb_obj_invalidate - invalidate frontbuffer object | |
128 | * @obj: GEM object to invalidate | |
129 | * @ring: set for asynchronous rendering | |
130 | * | |
131 | * This function gets called every time rendering on the given object starts and | |
132 | * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must | |
133 | * be invalidated. If @ring is non-NULL any subsequent invalidation will be delayed | |
134 | * until the rendering completes or a flip on this frontbuffer plane is | |
135 | * scheduled. | |
136 | */ | |
137 | void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj, | |
138 | struct intel_engine_cs *ring) | |
139 | { | |
140 | struct drm_device *dev = obj->base.dev; | |
141 | struct drm_i915_private *dev_priv = dev->dev_private; | |
142 | ||
143 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
144 | ||
145 | if (!obj->frontbuffer_bits) | |
146 | return; | |
147 | ||
148 | if (ring) { | |
149 | mutex_lock(&dev_priv->fb_tracking.lock); | |
150 | dev_priv->fb_tracking.busy_bits | |
151 | |= obj->frontbuffer_bits; | |
152 | dev_priv->fb_tracking.flip_bits | |
153 | &= ~obj->frontbuffer_bits; | |
154 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
155 | } | |
156 | ||
157 | intel_mark_fb_busy(dev, obj->frontbuffer_bits, ring); | |
158 | ||
159 | intel_edp_psr_invalidate(dev, obj->frontbuffer_bits); | |
160 | } | |
161 | ||
162 | /** | |
163 | * intel_frontbuffer_flush - flush frontbuffer | |
164 | * @dev: DRM device | |
165 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
166 | * | |
167 | * This function gets called every time rendering on the given planes has | |
168 | * completed and frontbuffer caching can be started again. Flushes will get | |
5c323b2a | 169 | * delayed if they're blocked by some outstanding asynchronous rendering. |
b680c37a DV |
170 | * |
171 | * Can be called without any locks held. | |
172 | */ | |
173 | void intel_frontbuffer_flush(struct drm_device *dev, | |
174 | unsigned frontbuffer_bits) | |
175 | { | |
176 | struct drm_i915_private *dev_priv = dev->dev_private; | |
177 | ||
178 | /* Delay flushing when rings are still busy.*/ | |
179 | mutex_lock(&dev_priv->fb_tracking.lock); | |
180 | frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits; | |
181 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
182 | ||
183 | intel_mark_fb_busy(dev, frontbuffer_bits, NULL); | |
184 | ||
185 | intel_edp_psr_flush(dev, frontbuffer_bits); | |
186 | ||
187 | /* | |
188 | * FIXME: Unconditional fbc flushing here is a rather gross hack and | |
189 | * needs to be reworked into a proper frontbuffer tracking scheme like | |
190 | * psr employs. | |
191 | */ | |
1d73c2a8 RV |
192 | if (dev_priv->fbc.need_sw_cache_clean) { |
193 | dev_priv->fbc.need_sw_cache_clean = false; | |
194 | bdw_fbc_sw_flush(dev, FBC_REND_CACHE_CLEAN); | |
195 | } | |
b680c37a DV |
196 | } |
197 | ||
198 | /** | |
199 | * intel_fb_obj_flush - flush frontbuffer object | |
200 | * @obj: GEM object to flush | |
201 | * @retire: set when retiring asynchronous rendering | |
202 | * | |
203 | * This function gets called every time rendering on the given object has | |
204 | * completed and frontbuffer caching can be started again. If @retire is true | |
205 | * then any delayed flushes will be unblocked. | |
206 | */ | |
207 | void intel_fb_obj_flush(struct drm_i915_gem_object *obj, | |
208 | bool retire) | |
209 | { | |
210 | struct drm_device *dev = obj->base.dev; | |
211 | struct drm_i915_private *dev_priv = dev->dev_private; | |
212 | unsigned frontbuffer_bits; | |
213 | ||
214 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
215 | ||
216 | if (!obj->frontbuffer_bits) | |
217 | return; | |
218 | ||
219 | frontbuffer_bits = obj->frontbuffer_bits; | |
220 | ||
221 | if (retire) { | |
222 | mutex_lock(&dev_priv->fb_tracking.lock); | |
223 | /* Filter out new bits since rendering started. */ | |
224 | frontbuffer_bits &= dev_priv->fb_tracking.busy_bits; | |
225 | ||
226 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
227 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
228 | } | |
229 | ||
230 | intel_frontbuffer_flush(dev, frontbuffer_bits); | |
231 | } | |
232 | ||
233 | /** | |
5c323b2a | 234 | * intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip |
b680c37a DV |
235 | * @dev: DRM device |
236 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
237 | * | |
238 | * This function gets called after scheduling a flip on @obj. The actual | |
239 | * frontbuffer flushing will be delayed until completion is signalled with | |
240 | * intel_frontbuffer_flip_complete. If an invalidate happens in between this | |
241 | * flush will be cancelled. | |
242 | * | |
243 | * Can be called without any locks held. | |
244 | */ | |
245 | void intel_frontbuffer_flip_prepare(struct drm_device *dev, | |
246 | unsigned frontbuffer_bits) | |
247 | { | |
248 | struct drm_i915_private *dev_priv = dev->dev_private; | |
249 | ||
250 | mutex_lock(&dev_priv->fb_tracking.lock); | |
11c9b6c6 DV |
251 | dev_priv->fb_tracking.flip_bits |= frontbuffer_bits; |
252 | /* Remove stale busy bits due to the old buffer. */ | |
253 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; | |
b680c37a DV |
254 | mutex_unlock(&dev_priv->fb_tracking.lock); |
255 | } | |
256 | ||
257 | /** | |
5c323b2a | 258 | * intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip |
b680c37a DV |
259 | * @dev: DRM device |
260 | * @frontbuffer_bits: frontbuffer plane tracking bits | |
261 | * | |
262 | * This function gets called after the flip has been latched and will complete | |
5c323b2a | 263 | * on the next vblank. It will execute the flush if it hasn't been cancelled yet. |
b680c37a DV |
264 | * |
265 | * Can be called without any locks held. | |
266 | */ | |
267 | void intel_frontbuffer_flip_complete(struct drm_device *dev, | |
268 | unsigned frontbuffer_bits) | |
269 | { | |
270 | struct drm_i915_private *dev_priv = dev->dev_private; | |
271 | ||
272 | mutex_lock(&dev_priv->fb_tracking.lock); | |
273 | /* Mask any cancelled flips. */ | |
274 | frontbuffer_bits &= dev_priv->fb_tracking.flip_bits; | |
275 | dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits; | |
276 | mutex_unlock(&dev_priv->fb_tracking.lock); | |
277 | ||
278 | intel_frontbuffer_flush(dev, frontbuffer_bits); | |
279 | } |