Merge remote-tracking branch 'ftrace/for-next'
[deliverable/linux.git] / drivers / gpu / drm / msm / msm_atomic.c
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1/*
2 * Copyright (C) 2014 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include "msm_drv.h"
19#include "msm_kms.h"
20#include "msm_gem.h"
fde5de6c 21#include "msm_fence.h"
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22
23struct msm_commit {
0b776d45 24 struct drm_device *dev;
cf3a7e4c 25 struct drm_atomic_state *state;
ba00c3f2 26 struct work_struct work;
f86afecf 27 uint32_t crtc_mask;
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28};
29
ba00c3f2 30static void commit_worker(struct work_struct *work);
cf3a7e4c 31
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32/* block until specified crtcs are no longer pending update, and
33 * atomically mark them as pending update
34 */
35static int start_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)
36{
37 int ret;
38
39 spin_lock(&priv->pending_crtcs_event.lock);
40 ret = wait_event_interruptible_locked(priv->pending_crtcs_event,
41 !(priv->pending_crtcs & crtc_mask));
42 if (ret == 0) {
43 DBG("start: %08x", crtc_mask);
44 priv->pending_crtcs |= crtc_mask;
45 }
46 spin_unlock(&priv->pending_crtcs_event.lock);
47
48 return ret;
49}
50
51/* clear specified crtcs (no longer pending update)
52 */
53static void end_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)
54{
55 spin_lock(&priv->pending_crtcs_event.lock);
56 DBG("end: %08x", crtc_mask);
57 priv->pending_crtcs &= ~crtc_mask;
58 wake_up_all_locked(&priv->pending_crtcs_event);
59 spin_unlock(&priv->pending_crtcs_event.lock);
60}
61
0b776d45 62static struct msm_commit *commit_init(struct drm_atomic_state *state)
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63{
64 struct msm_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
65
66 if (!c)
67 return NULL;
68
0b776d45 69 c->dev = state->dev;
cf3a7e4c 70 c->state = state;
0b776d45 71
ba00c3f2 72 INIT_WORK(&c->work, commit_worker);
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73
74 return c;
75}
76
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77static void commit_destroy(struct msm_commit *c)
78{
79 end_atomic(c->dev->dev_private, c->crtc_mask);
80 kfree(c);
81}
82
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83static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
84 struct drm_atomic_state *old_state)
85{
86 struct drm_crtc *crtc;
8d76b79f 87 struct drm_crtc_state *crtc_state;
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88 struct msm_drm_private *priv = old_state->dev->dev_private;
89 struct msm_kms *kms = priv->kms;
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90 int i;
91
8d76b79f 92 for_each_crtc_in_state(old_state, crtc, crtc_state, i) {
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93 if (!crtc->state->enable)
94 continue;
95
96 /* Legacy cursor ioctls are completely unsynced, and userspace
97 * relies on that (by doing tons of cursor updates). */
98 if (old_state->legacy_cursor_update)
99 continue;
100
101 kms->funcs->wait_for_crtc_commit_done(kms, crtc);
102 }
103}
104
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105/* The (potentially) asynchronous part of the commit. At this point
106 * nothing can fail short of armageddon.
107 */
ba00c3f2 108static void complete_commit(struct msm_commit *c, bool async)
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109{
110 struct drm_atomic_state *state = c->state;
111 struct drm_device *dev = state->dev;
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112 struct msm_drm_private *priv = dev->dev_private;
113 struct msm_kms *kms = priv->kms;
114
f6ce410a 115 drm_atomic_helper_wait_for_fences(dev, state, false);
ba00c3f2 116
0b776d45 117 kms->funcs->prepare_commit(kms, state);
cf3a7e4c 118
1af434a9 119 drm_atomic_helper_commit_modeset_disables(dev, state);
cf3a7e4c 120
2b58e98d 121 drm_atomic_helper_commit_planes(dev, state, 0);
cf3a7e4c 122
1af434a9 123 drm_atomic_helper_commit_modeset_enables(dev, state);
cf3a7e4c 124
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125 /* NOTE: _wait_for_vblanks() only waits for vblank on
126 * enabled CRTCs. So we end up faulting when disabling
127 * due to (potentially) unref'ing the outgoing fb's
128 * before the vblank when the disable has latched.
129 *
130 * But if it did wait on disabled (or newly disabled)
131 * CRTCs, that would be racy (ie. we could have missed
132 * the irq. We need some way to poll for pipe shut
133 * down. Or just live with occasionally hitting the
134 * timeout in the CRTC disable path (which really should
135 * not be critical path)
136 */
137
0a5c9aad 138 msm_atomic_wait_for_commit_done(dev, state);
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139
140 drm_atomic_helper_cleanup_planes(dev, state);
141
0b776d45 142 kms->funcs->complete_commit(kms, state);
cf3a7e4c 143
0b776d45 144 drm_atomic_state_free(state);
f86afecf 145
0b776d45 146 commit_destroy(c);
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147}
148
ba00c3f2 149static void commit_worker(struct work_struct *work)
cf3a7e4c 150{
ba00c3f2 151 complete_commit(container_of(work, struct msm_commit, work), true);
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152}
153
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154int msm_atomic_check(struct drm_device *dev,
155 struct drm_atomic_state *state)
156{
157 int ret;
158
159 /*
160 * msm ->atomic_check can update ->mode_changed for pixel format
161 * changes, hence must be run before we check the modeset changes.
162 */
163 ret = drm_atomic_helper_check_planes(dev, state);
164 if (ret)
165 return ret;
166
167 ret = drm_atomic_helper_check_modeset(dev, state);
168 if (ret)
169 return ret;
170
171 return ret;
172}
173
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174/**
175 * drm_atomic_helper_commit - commit validated state object
176 * @dev: DRM device
177 * @state: the driver state object
a3ccfb9f 178 * @nonblock: nonblocking commit
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179 *
180 * This function commits a with drm_atomic_helper_check() pre-validated state
a3ccfb9f 181 * object. This can still fail when e.g. the framebuffer reservation fails.
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182 *
183 * RETURNS
184 * Zero for success or -errno.
185 */
186int msm_atomic_commit(struct drm_device *dev,
a3ccfb9f 187 struct drm_atomic_state *state, bool nonblock)
cf3a7e4c 188{
ca762a8a 189 struct msm_drm_private *priv = dev->dev_private;
f86afecf 190 struct msm_commit *c;
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191 struct drm_crtc *crtc;
192 struct drm_crtc_state *crtc_state;
193 struct drm_plane *plane;
194 struct drm_plane_state *plane_state;
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195 int i, ret;
196
197 ret = drm_atomic_helper_prepare_planes(dev, state);
198 if (ret)
199 return ret;
200
0b776d45 201 c = commit_init(state);
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202 if (!c) {
203 ret = -ENOMEM;
204 goto error;
205 }
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206
207 /*
208 * Figure out what crtcs we have:
209 */
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210 for_each_crtc_in_state(state, crtc, crtc_state, i)
211 c->crtc_mask |= drm_crtc_mask(crtc);
cf3a7e4c 212
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213 /*
214 * Figure out what fence to wait for:
215 */
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216 for_each_plane_in_state(state, plane, plane_state, i) {
217 if ((plane->state->fb != plane_state->fb) && plane_state->fb) {
218 struct drm_gem_object *obj = msm_framebuffer_bo(plane_state->fb, 0);
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219 struct msm_gem_object *msm_obj = to_msm_bo(obj);
220
8d76b79f 221 plane_state->fence = reservation_object_get_excl_rcu(msm_obj->resv);
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222 }
223 }
224
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225 /*
226 * Wait for pending updates on any of the same crtc's and then
227 * mark our set of crtc's as busy:
228 */
229 ret = start_atomic(dev->dev_private, c->crtc_mask);
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230 if (ret) {
231 kfree(c);
f65c18c0 232 goto error;
5b2e2b6c 233 }
f86afecf 234
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235 /*
236 * This is the point of no return - everything below never fails except
237 * when the hw goes bonghits. Which means we can commit the new state on
238 * the software side now.
239 */
240
5e84c269 241 drm_atomic_helper_swap_state(state, true);
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242
243 /*
244 * Everything below can be run asynchronously without the need to grab
245 * any modeset locks at all under one conditions: It must be guaranteed
246 * that the asynchronous work has either been cancelled (if the driver
247 * supports it, which at least requires that the framebuffers get
248 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
249 * before the new state gets committed on the software side with
250 * drm_atomic_helper_swap_state().
251 *
252 * This scheme allows new atomic state updates to be prepared and
253 * checked in parallel to the asynchronous completion of the previous
254 * update. Which is important since compositors need to figure out the
255 * composition of the next frame right after having submitted the
256 * current layout.
257 */
258
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259 if (nonblock) {
260 queue_work(priv->atomic_wq, &c->work);
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261 return 0;
262 }
263
ba00c3f2 264 complete_commit(c, false);
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265
266 return 0;
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267
268error:
269 drm_atomic_helper_cleanup_planes(dev, state);
270 return ret;
cf3a7e4c 271}
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