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Daniel Vetterb680c372014-09-19 18:27:27 +02001/*
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
Daniel Vetter5c323b22014-09-30 22:10:53 +020031 * frontbuffer, especially rendering targeted at the frontbuffer.
Daniel Vetterb680c372014-09-19 18:27:27 +020032 *
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
Daniel Vetter5c323b22014-09-30 22:10:53 +020058 * just tracks general activity. This is done by the various mark_busy and
Daniel Vetterb680c372014-09-19 18:27:27 +020059 * 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"
Chris Wilson5d723d72016-08-04 16:32:35 +010066#include "intel_frontbuffer.h"
Daniel Vetterb680c372014-09-19 18:27:27 +020067#include "i915_drv.h"
68
Chris Wilsonb5add952016-08-04 16:32:36 +010069void __intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
Chris Wilsonfaf5bf02016-08-04 16:32:37 +010070 enum fb_op_origin origin,
71 unsigned int frontbuffer_bits)
Daniel Vetterb680c372014-09-19 18:27:27 +020072{
Chris Wilson5748b6a2016-08-04 16:32:38 +010073 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
Daniel Vetterb680c372014-09-19 18:27:27 +020074
Rodrigo Vivi77a0d1c2015-06-18 11:43:24 -070075 if (origin == ORIGIN_CS) {
Chris Wilsonb5add952016-08-04 16:32:36 +010076 spin_lock(&dev_priv->fb_tracking.lock);
Chris Wilsonfaf5bf02016-08-04 16:32:37 +010077 dev_priv->fb_tracking.busy_bits |= frontbuffer_bits;
78 dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits;
Chris Wilsonb5add952016-08-04 16:32:36 +010079 spin_unlock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +020080 }
81
Chris Wilson5748b6a2016-08-04 16:32:38 +010082 intel_psr_invalidate(dev_priv, frontbuffer_bits);
83 intel_edp_drrs_invalidate(dev_priv, frontbuffer_bits);
Chris Wilsonfaf5bf02016-08-04 16:32:37 +010084 intel_fbc_invalidate(dev_priv, frontbuffer_bits, origin);
Daniel Vetterb680c372014-09-19 18:27:27 +020085}
86
87/**
88 * intel_frontbuffer_flush - flush frontbuffer
Chris Wilson5748b6a2016-08-04 16:32:38 +010089 * @dev_priv: i915 device
Daniel Vetterb680c372014-09-19 18:27:27 +020090 * @frontbuffer_bits: frontbuffer plane tracking bits
Rodrigo Vivide152b62015-07-07 16:28:51 -070091 * @origin: which operation caused the flush
Daniel Vetterb680c372014-09-19 18:27:27 +020092 *
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
Daniel Vetter5c323b22014-09-30 22:10:53 +020095 * delayed if they're blocked by some outstanding asynchronous rendering.
Daniel Vetterb680c372014-09-19 18:27:27 +020096 *
97 * Can be called without any locks held.
98 */
Chris Wilson5748b6a2016-08-04 16:32:38 +010099static void intel_frontbuffer_flush(struct drm_i915_private *dev_priv,
Paulo Zanonib6c2aa52015-07-08 18:08:37 -0300100 unsigned frontbuffer_bits,
101 enum fb_op_origin origin)
Daniel Vetterb680c372014-09-19 18:27:27 +0200102{
Daniel Vetterb680c372014-09-19 18:27:27 +0200103 /* Delay flushing when rings are still busy.*/
Chris Wilsonb5add952016-08-04 16:32:36 +0100104 spin_lock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +0200105 frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits;
Chris Wilsonb5add952016-08-04 16:32:36 +0100106 spin_unlock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +0200107
Daniel Vetter27e78a22015-06-18 10:30:21 +0200108 if (!frontbuffer_bits)
109 return;
110
Chris Wilson5748b6a2016-08-04 16:32:38 +0100111 intel_edp_drrs_flush(dev_priv, frontbuffer_bits);
112 intel_psr_flush(dev_priv, frontbuffer_bits, origin);
Paulo Zanoni6f4551f2015-07-14 16:29:10 -0300113 intel_fbc_flush(dev_priv, frontbuffer_bits, origin);
Daniel Vetterb680c372014-09-19 18:27:27 +0200114}
115
Chris Wilsonb5add952016-08-04 16:32:36 +0100116void __intel_fb_obj_flush(struct drm_i915_gem_object *obj,
117 bool retire,
Chris Wilsonfaf5bf02016-08-04 16:32:37 +0100118 enum fb_op_origin origin,
119 unsigned int frontbuffer_bits)
Daniel Vetterb680c372014-09-19 18:27:27 +0200120{
Chris Wilson5748b6a2016-08-04 16:32:38 +0100121 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
Daniel Vetterb680c372014-09-19 18:27:27 +0200122
123 if (retire) {
Chris Wilsonb5add952016-08-04 16:32:36 +0100124 spin_lock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +0200125 /* Filter out new bits since rendering started. */
126 frontbuffer_bits &= dev_priv->fb_tracking.busy_bits;
Daniel Vetterb680c372014-09-19 18:27:27 +0200127 dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
Chris Wilsonb5add952016-08-04 16:32:36 +0100128 spin_unlock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +0200129 }
130
Chris Wilsonb5add952016-08-04 16:32:36 +0100131 if (frontbuffer_bits)
Chris Wilson5748b6a2016-08-04 16:32:38 +0100132 intel_frontbuffer_flush(dev_priv, frontbuffer_bits, origin);
Daniel Vetterb680c372014-09-19 18:27:27 +0200133}
134
135/**
Daniel Vetter5c323b22014-09-30 22:10:53 +0200136 * intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip
Chris Wilson5748b6a2016-08-04 16:32:38 +0100137 * @dev_priv: i915 device
Daniel Vetterb680c372014-09-19 18:27:27 +0200138 * @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 */
Chris Wilson5748b6a2016-08-04 16:32:38 +0100147void intel_frontbuffer_flip_prepare(struct drm_i915_private *dev_priv,
Daniel Vetterb680c372014-09-19 18:27:27 +0200148 unsigned frontbuffer_bits)
149{
Chris Wilsonb5add952016-08-04 16:32:36 +0100150 spin_lock(&dev_priv->fb_tracking.lock);
Daniel Vetter11c9b6c2014-09-30 22:10:52 +0200151 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;
Chris Wilsonb5add952016-08-04 16:32:36 +0100154 spin_unlock(&dev_priv->fb_tracking.lock);
Rodrigo Vivic7240c32015-04-10 11:15:10 -0700155
Chris Wilson5748b6a2016-08-04 16:32:38 +0100156 intel_psr_single_frame_update(dev_priv, frontbuffer_bits);
Daniel Vetterb680c372014-09-19 18:27:27 +0200157}
158
159/**
Daniel Vetter5c323b22014-09-30 22:10:53 +0200160 * intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip
Chris Wilson5748b6a2016-08-04 16:32:38 +0100161 * @dev_priv: i915 device
Daniel Vetterb680c372014-09-19 18:27:27 +0200162 * @frontbuffer_bits: frontbuffer plane tracking bits
163 *
164 * This function gets called after the flip has been latched and will complete
Daniel Vetter5c323b22014-09-30 22:10:53 +0200165 * on the next vblank. It will execute the flush if it hasn't been cancelled yet.
Daniel Vetterb680c372014-09-19 18:27:27 +0200166 *
167 * Can be called without any locks held.
168 */
Chris Wilson5748b6a2016-08-04 16:32:38 +0100169void intel_frontbuffer_flip_complete(struct drm_i915_private *dev_priv,
Daniel Vetterb680c372014-09-19 18:27:27 +0200170 unsigned frontbuffer_bits)
171{
Chris Wilsonb5add952016-08-04 16:32:36 +0100172 spin_lock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +0200173 /* Mask any cancelled flips. */
174 frontbuffer_bits &= dev_priv->fb_tracking.flip_bits;
175 dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits;
Chris Wilsonb5add952016-08-04 16:32:36 +0100176 spin_unlock(&dev_priv->fb_tracking.lock);
Daniel Vetterb680c372014-09-19 18:27:27 +0200177
Chris Wilsonb5add952016-08-04 16:32:36 +0100178 if (frontbuffer_bits)
Chris Wilson5748b6a2016-08-04 16:32:38 +0100179 intel_frontbuffer_flush(dev_priv,
180 frontbuffer_bits, ORIGIN_FLIP);
Daniel Vetterb680c372014-09-19 18:27:27 +0200181}
Daniel Vetterfdbff922015-06-18 11:23:24 +0200182
183/**
184 * intel_frontbuffer_flip - synchronous frontbuffer flip
Chris Wilson5748b6a2016-08-04 16:32:38 +0100185 * @dev_priv: i915 device
Daniel Vetterfdbff922015-06-18 11:23:24 +0200186 * @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 */
Chris Wilson5748b6a2016-08-04 16:32:38 +0100194void intel_frontbuffer_flip(struct drm_i915_private *dev_priv,
Daniel Vetterfdbff922015-06-18 11:23:24 +0200195 unsigned frontbuffer_bits)
196{
Chris Wilsonb5add952016-08-04 16:32:36 +0100197 spin_lock(&dev_priv->fb_tracking.lock);
Daniel Vetterfdbff922015-06-18 11:23:24 +0200198 /* Remove stale busy bits due to the old buffer. */
199 dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
Chris Wilsonb5add952016-08-04 16:32:36 +0100200 spin_unlock(&dev_priv->fb_tracking.lock);
Daniel Vetterfdbff922015-06-18 11:23:24 +0200201
Chris Wilson5748b6a2016-08-04 16:32:38 +0100202 intel_frontbuffer_flush(dev_priv, frontbuffer_bits, ORIGIN_FLIP);
Daniel Vetterfdbff922015-06-18 11:23:24 +0200203}