Rob Clark | cf3a7e4 | 2014-11-08 13:21:06 -0500 | [diff] [blame] | 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; |
| 26 | }; |
| 27 | |
| 28 | static void fence_cb(struct msm_fence_cb *cb); |
| 29 | |
| 30 | static struct msm_commit *new_commit(struct drm_atomic_state *state) |
| 31 | { |
| 32 | struct msm_commit *c = kzalloc(sizeof(*c), GFP_KERNEL); |
| 33 | |
| 34 | if (!c) |
| 35 | return NULL; |
| 36 | |
| 37 | c->state = state; |
| 38 | /* TODO we might need a way to indicate to run the cb on a |
| 39 | * different wq so wait_for_vblanks() doesn't block retiring |
| 40 | * bo's.. |
| 41 | */ |
| 42 | INIT_FENCE_CB(&c->fence_cb, fence_cb); |
| 43 | |
| 44 | return c; |
| 45 | } |
| 46 | |
| 47 | /* The (potentially) asynchronous part of the commit. At this point |
| 48 | * nothing can fail short of armageddon. |
| 49 | */ |
| 50 | static void complete_commit(struct msm_commit *c) |
| 51 | { |
| 52 | struct drm_atomic_state *state = c->state; |
| 53 | struct drm_device *dev = state->dev; |
| 54 | |
| 55 | drm_atomic_helper_commit_pre_planes(dev, state); |
| 56 | |
| 57 | drm_atomic_helper_commit_planes(dev, state); |
| 58 | |
| 59 | drm_atomic_helper_commit_post_planes(dev, state); |
| 60 | |
| 61 | drm_atomic_helper_wait_for_vblanks(dev, state); |
| 62 | |
| 63 | drm_atomic_helper_cleanup_planes(dev, state); |
| 64 | |
| 65 | drm_atomic_state_free(state); |
| 66 | |
| 67 | kfree(c); |
| 68 | } |
| 69 | |
| 70 | static void fence_cb(struct msm_fence_cb *cb) |
| 71 | { |
| 72 | struct msm_commit *c = |
| 73 | container_of(cb, struct msm_commit, fence_cb); |
| 74 | complete_commit(c); |
| 75 | } |
| 76 | |
| 77 | static void add_fb(struct msm_commit *c, struct drm_framebuffer *fb) |
| 78 | { |
| 79 | struct drm_gem_object *obj = msm_framebuffer_bo(fb, 0); |
| 80 | c->fence = max(c->fence, msm_gem_fence(to_msm_bo(obj), MSM_PREP_READ)); |
| 81 | } |
| 82 | |
| 83 | |
Daniel Vetter | b4274fb | 2014-11-26 17:02:18 +0100 | [diff] [blame^] | 84 | int msm_atomic_check(struct drm_device *dev, |
| 85 | struct drm_atomic_state *state) |
| 86 | { |
| 87 | int ret; |
| 88 | |
| 89 | /* |
| 90 | * msm ->atomic_check can update ->mode_changed for pixel format |
| 91 | * changes, hence must be run before we check the modeset changes. |
| 92 | */ |
| 93 | ret = drm_atomic_helper_check_planes(dev, state); |
| 94 | if (ret) |
| 95 | return ret; |
| 96 | |
| 97 | ret = drm_atomic_helper_check_modeset(dev, state); |
| 98 | if (ret) |
| 99 | return ret; |
| 100 | |
| 101 | return ret; |
| 102 | } |
| 103 | |
Rob Clark | cf3a7e4 | 2014-11-08 13:21:06 -0500 | [diff] [blame] | 104 | /** |
| 105 | * drm_atomic_helper_commit - commit validated state object |
| 106 | * @dev: DRM device |
| 107 | * @state: the driver state object |
| 108 | * @async: asynchronous commit |
| 109 | * |
| 110 | * This function commits a with drm_atomic_helper_check() pre-validated state |
| 111 | * object. This can still fail when e.g. the framebuffer reservation fails. For |
| 112 | * now this doesn't implement asynchronous commits. |
| 113 | * |
| 114 | * RETURNS |
| 115 | * Zero for success or -errno. |
| 116 | */ |
| 117 | int msm_atomic_commit(struct drm_device *dev, |
| 118 | struct drm_atomic_state *state, bool async) |
| 119 | { |
| 120 | struct msm_commit *c; |
| 121 | int nplanes = dev->mode_config.num_total_plane; |
| 122 | int i, ret; |
| 123 | |
| 124 | ret = drm_atomic_helper_prepare_planes(dev, state); |
| 125 | if (ret) |
| 126 | return ret; |
| 127 | |
| 128 | c = new_commit(state); |
| 129 | |
| 130 | /* |
| 131 | * Figure out what fence to wait for: |
| 132 | */ |
| 133 | for (i = 0; i < nplanes; i++) { |
| 134 | struct drm_plane *plane = state->planes[i]; |
| 135 | struct drm_plane_state *new_state = state->plane_states[i]; |
| 136 | |
| 137 | if (!plane) |
| 138 | continue; |
| 139 | |
Rob Clark | 3e2f29e | 2014-11-19 12:29:33 -0500 | [diff] [blame] | 140 | if ((plane->state->fb != new_state->fb) && new_state->fb) |
Rob Clark | cf3a7e4 | 2014-11-08 13:21:06 -0500 | [diff] [blame] | 141 | add_fb(c, new_state->fb); |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * This is the point of no return - everything below never fails except |
| 146 | * when the hw goes bonghits. Which means we can commit the new state on |
| 147 | * the software side now. |
| 148 | */ |
| 149 | |
| 150 | drm_atomic_helper_swap_state(dev, state); |
| 151 | |
| 152 | /* |
| 153 | * Everything below can be run asynchronously without the need to grab |
| 154 | * any modeset locks at all under one conditions: It must be guaranteed |
| 155 | * that the asynchronous work has either been cancelled (if the driver |
| 156 | * supports it, which at least requires that the framebuffers get |
| 157 | * cleaned up with drm_atomic_helper_cleanup_planes()) or completed |
| 158 | * before the new state gets committed on the software side with |
| 159 | * drm_atomic_helper_swap_state(). |
| 160 | * |
| 161 | * This scheme allows new atomic state updates to be prepared and |
| 162 | * checked in parallel to the asynchronous completion of the previous |
| 163 | * update. Which is important since compositors need to figure out the |
| 164 | * composition of the next frame right after having submitted the |
| 165 | * current layout. |
| 166 | */ |
| 167 | |
| 168 | if (async) { |
| 169 | msm_queue_fence_cb(dev, &c->fence_cb, c->fence); |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | ret = msm_wait_fence_interruptable(dev, c->fence, NULL); |
| 174 | if (ret) { |
| 175 | WARN_ON(ret); // TODO unswap state back? or?? |
| 176 | kfree(c); |
| 177 | return ret; |
| 178 | } |
| 179 | |
| 180 | complete_commit(c); |
| 181 | |
| 182 | return 0; |
| 183 | } |