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cf3a7e4c RC |
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" | |
21 | ||
22 | struct msm_commit { | |
23 | struct drm_atomic_state *state; | |
24 | uint32_t fence; | |
25 | struct msm_fence_cb fence_cb; | |
f86afecf | 26 | uint32_t crtc_mask; |
cf3a7e4c RC |
27 | }; |
28 | ||
29 | static void fence_cb(struct msm_fence_cb *cb); | |
30 | ||
f86afecf RC |
31 | /* block until specified crtcs are no longer pending update, and |
32 | * atomically mark them as pending update | |
33 | */ | |
34 | static int start_atomic(struct msm_drm_private *priv, uint32_t crtc_mask) | |
35 | { | |
36 | int ret; | |
37 | ||
38 | spin_lock(&priv->pending_crtcs_event.lock); | |
39 | ret = wait_event_interruptible_locked(priv->pending_crtcs_event, | |
40 | !(priv->pending_crtcs & crtc_mask)); | |
41 | if (ret == 0) { | |
42 | DBG("start: %08x", crtc_mask); | |
43 | priv->pending_crtcs |= crtc_mask; | |
44 | } | |
45 | spin_unlock(&priv->pending_crtcs_event.lock); | |
46 | ||
47 | return ret; | |
48 | } | |
49 | ||
50 | /* clear specified crtcs (no longer pending update) | |
51 | */ | |
52 | static void end_atomic(struct msm_drm_private *priv, uint32_t crtc_mask) | |
53 | { | |
54 | spin_lock(&priv->pending_crtcs_event.lock); | |
55 | DBG("end: %08x", crtc_mask); | |
56 | priv->pending_crtcs &= ~crtc_mask; | |
57 | wake_up_all_locked(&priv->pending_crtcs_event); | |
58 | spin_unlock(&priv->pending_crtcs_event.lock); | |
59 | } | |
60 | ||
cf3a7e4c RC |
61 | static struct msm_commit *new_commit(struct drm_atomic_state *state) |
62 | { | |
63 | struct msm_commit *c = kzalloc(sizeof(*c), GFP_KERNEL); | |
64 | ||
65 | if (!c) | |
66 | return NULL; | |
67 | ||
68 | c->state = state; | |
69 | /* TODO we might need a way to indicate to run the cb on a | |
70 | * different wq so wait_for_vblanks() doesn't block retiring | |
71 | * bo's.. | |
72 | */ | |
73 | INIT_FENCE_CB(&c->fence_cb, fence_cb); | |
74 | ||
75 | return c; | |
76 | } | |
77 | ||
78 | /* The (potentially) asynchronous part of the commit. At this point | |
79 | * nothing can fail short of armageddon. | |
80 | */ | |
81 | static void complete_commit(struct msm_commit *c) | |
82 | { | |
83 | struct drm_atomic_state *state = c->state; | |
84 | struct drm_device *dev = state->dev; | |
85 | ||
86 | drm_atomic_helper_commit_pre_planes(dev, state); | |
87 | ||
88 | drm_atomic_helper_commit_planes(dev, state); | |
89 | ||
90 | drm_atomic_helper_commit_post_planes(dev, state); | |
91 | ||
f86afecf RC |
92 | /* NOTE: _wait_for_vblanks() only waits for vblank on |
93 | * enabled CRTCs. So we end up faulting when disabling | |
94 | * due to (potentially) unref'ing the outgoing fb's | |
95 | * before the vblank when the disable has latched. | |
96 | * | |
97 | * But if it did wait on disabled (or newly disabled) | |
98 | * CRTCs, that would be racy (ie. we could have missed | |
99 | * the irq. We need some way to poll for pipe shut | |
100 | * down. Or just live with occasionally hitting the | |
101 | * timeout in the CRTC disable path (which really should | |
102 | * not be critical path) | |
103 | */ | |
104 | ||
cf3a7e4c RC |
105 | drm_atomic_helper_wait_for_vblanks(dev, state); |
106 | ||
107 | drm_atomic_helper_cleanup_planes(dev, state); | |
108 | ||
109 | drm_atomic_state_free(state); | |
110 | ||
f86afecf RC |
111 | end_atomic(dev->dev_private, c->crtc_mask); |
112 | ||
cf3a7e4c RC |
113 | kfree(c); |
114 | } | |
115 | ||
116 | static void fence_cb(struct msm_fence_cb *cb) | |
117 | { | |
118 | struct msm_commit *c = | |
119 | container_of(cb, struct msm_commit, fence_cb); | |
120 | complete_commit(c); | |
121 | } | |
122 | ||
123 | static void add_fb(struct msm_commit *c, struct drm_framebuffer *fb) | |
124 | { | |
125 | struct drm_gem_object *obj = msm_framebuffer_bo(fb, 0); | |
126 | c->fence = max(c->fence, msm_gem_fence(to_msm_bo(obj), MSM_PREP_READ)); | |
127 | } | |
128 | ||
129 | ||
130 | /** | |
131 | * drm_atomic_helper_commit - commit validated state object | |
132 | * @dev: DRM device | |
133 | * @state: the driver state object | |
134 | * @async: asynchronous commit | |
135 | * | |
136 | * This function commits a with drm_atomic_helper_check() pre-validated state | |
137 | * object. This can still fail when e.g. the framebuffer reservation fails. For | |
138 | * now this doesn't implement asynchronous commits. | |
139 | * | |
140 | * RETURNS | |
141 | * Zero for success or -errno. | |
142 | */ | |
143 | int msm_atomic_commit(struct drm_device *dev, | |
144 | struct drm_atomic_state *state, bool async) | |
145 | { | |
cf3a7e4c | 146 | int nplanes = dev->mode_config.num_total_plane; |
f86afecf RC |
147 | int ncrtcs = dev->mode_config.num_crtc; |
148 | struct msm_commit *c; | |
cf3a7e4c RC |
149 | int i, ret; |
150 | ||
151 | ret = drm_atomic_helper_prepare_planes(dev, state); | |
152 | if (ret) | |
153 | return ret; | |
154 | ||
155 | c = new_commit(state); | |
f86afecf RC |
156 | if (!c) |
157 | return -ENOMEM; | |
158 | ||
159 | /* | |
160 | * Figure out what crtcs we have: | |
161 | */ | |
162 | for (i = 0; i < ncrtcs; i++) { | |
163 | struct drm_crtc *crtc = state->crtcs[i]; | |
164 | if (!crtc) | |
165 | continue; | |
166 | c->crtc_mask |= (1 << drm_crtc_index(crtc)); | |
167 | } | |
cf3a7e4c RC |
168 | |
169 | /* | |
170 | * Figure out what fence to wait for: | |
171 | */ | |
172 | for (i = 0; i < nplanes; i++) { | |
173 | struct drm_plane *plane = state->planes[i]; | |
174 | struct drm_plane_state *new_state = state->plane_states[i]; | |
175 | ||
176 | if (!plane) | |
177 | continue; | |
178 | ||
3e2f29e4 | 179 | if ((plane->state->fb != new_state->fb) && new_state->fb) |
cf3a7e4c RC |
180 | add_fb(c, new_state->fb); |
181 | } | |
182 | ||
f86afecf RC |
183 | /* |
184 | * Wait for pending updates on any of the same crtc's and then | |
185 | * mark our set of crtc's as busy: | |
186 | */ | |
187 | ret = start_atomic(dev->dev_private, c->crtc_mask); | |
188 | if (ret) | |
189 | return ret; | |
190 | ||
cf3a7e4c RC |
191 | /* |
192 | * This is the point of no return - everything below never fails except | |
193 | * when the hw goes bonghits. Which means we can commit the new state on | |
194 | * the software side now. | |
195 | */ | |
196 | ||
197 | drm_atomic_helper_swap_state(dev, state); | |
198 | ||
199 | /* | |
200 | * Everything below can be run asynchronously without the need to grab | |
201 | * any modeset locks at all under one conditions: It must be guaranteed | |
202 | * that the asynchronous work has either been cancelled (if the driver | |
203 | * supports it, which at least requires that the framebuffers get | |
204 | * cleaned up with drm_atomic_helper_cleanup_planes()) or completed | |
205 | * before the new state gets committed on the software side with | |
206 | * drm_atomic_helper_swap_state(). | |
207 | * | |
208 | * This scheme allows new atomic state updates to be prepared and | |
209 | * checked in parallel to the asynchronous completion of the previous | |
210 | * update. Which is important since compositors need to figure out the | |
211 | * composition of the next frame right after having submitted the | |
212 | * current layout. | |
213 | */ | |
214 | ||
215 | if (async) { | |
216 | msm_queue_fence_cb(dev, &c->fence_cb, c->fence); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | ret = msm_wait_fence_interruptable(dev, c->fence, NULL); | |
221 | if (ret) { | |
222 | WARN_ON(ret); // TODO unswap state back? or?? | |
223 | kfree(c); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | complete_commit(c); | |
228 | ||
229 | return 0; | |
230 | } |