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+/*
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+ * Copyright (C) 2014 Red Hat
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+ * Author: Rob Clark <robdclark@gmail.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published by
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+ * the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include "msm_drv.h"
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+#include "msm_kms.h"
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+#include "msm_gem.h"
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+
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+struct msm_commit {
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+ struct drm_atomic_state *state;
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+ uint32_t fence;
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+ struct msm_fence_cb fence_cb;
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+};
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+
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+static void fence_cb(struct msm_fence_cb *cb);
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+
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+static struct msm_commit *new_commit(struct drm_atomic_state *state)
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+{
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+ struct msm_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
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+
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+ if (!c)
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+ return NULL;
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+
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+ c->state = state;
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+ /* TODO we might need a way to indicate to run the cb on a
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+ * different wq so wait_for_vblanks() doesn't block retiring
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+ * bo's..
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+ */
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+ INIT_FENCE_CB(&c->fence_cb, fence_cb);
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+
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+ return c;
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+}
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+
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+/* The (potentially) asynchronous part of the commit. At this point
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+ * nothing can fail short of armageddon.
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+ */
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+static void complete_commit(struct msm_commit *c)
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+{
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+ struct drm_atomic_state *state = c->state;
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+ struct drm_device *dev = state->dev;
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+
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+ drm_atomic_helper_commit_pre_planes(dev, state);
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+
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+ drm_atomic_helper_commit_planes(dev, state);
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+
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+ drm_atomic_helper_commit_post_planes(dev, state);
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+
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+ drm_atomic_helper_wait_for_vblanks(dev, state);
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+
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+ drm_atomic_helper_cleanup_planes(dev, state);
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+
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+ drm_atomic_state_free(state);
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+
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+ kfree(c);
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+}
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+
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+static void fence_cb(struct msm_fence_cb *cb)
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+{
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+ struct msm_commit *c =
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+ container_of(cb, struct msm_commit, fence_cb);
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+ complete_commit(c);
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+}
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+
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+static void add_fb(struct msm_commit *c, struct drm_framebuffer *fb)
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+{
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+ struct drm_gem_object *obj = msm_framebuffer_bo(fb, 0);
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+ c->fence = max(c->fence, msm_gem_fence(to_msm_bo(obj), MSM_PREP_READ));
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+}
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+
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+
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+/**
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+ * drm_atomic_helper_commit - commit validated state object
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+ * @dev: DRM device
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+ * @state: the driver state object
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+ * @async: asynchronous commit
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+ *
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+ * This function commits a with drm_atomic_helper_check() pre-validated state
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+ * object. This can still fail when e.g. the framebuffer reservation fails. For
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+ * now this doesn't implement asynchronous commits.
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+ *
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+ * RETURNS
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+ * Zero for success or -errno.
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+ */
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+int msm_atomic_commit(struct drm_device *dev,
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+ struct drm_atomic_state *state, bool async)
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+{
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+ struct msm_commit *c;
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+ int nplanes = dev->mode_config.num_total_plane;
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+ int i, ret;
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+
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+ ret = drm_atomic_helper_prepare_planes(dev, state);
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+ if (ret)
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+ return ret;
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+
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+ c = new_commit(state);
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+
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+ /*
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+ * Figure out what fence to wait for:
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+ */
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+ for (i = 0; i < nplanes; i++) {
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+ struct drm_plane *plane = state->planes[i];
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+ struct drm_plane_state *new_state = state->plane_states[i];
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+
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+ if (!plane)
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+ continue;
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+
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+ if (plane->state->fb != new_state->fb)
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+ add_fb(c, new_state->fb);
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+ }
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+
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+ /*
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+ * This is the point of no return - everything below never fails except
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+ * when the hw goes bonghits. Which means we can commit the new state on
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+ * the software side now.
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+ */
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+
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+ drm_atomic_helper_swap_state(dev, state);
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+
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+ /*
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+ * Everything below can be run asynchronously without the need to grab
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+ * any modeset locks at all under one conditions: It must be guaranteed
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+ * that the asynchronous work has either been cancelled (if the driver
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+ * supports it, which at least requires that the framebuffers get
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+ * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
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+ * before the new state gets committed on the software side with
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+ * drm_atomic_helper_swap_state().
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+ *
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+ * This scheme allows new atomic state updates to be prepared and
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+ * checked in parallel to the asynchronous completion of the previous
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+ * update. Which is important since compositors need to figure out the
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+ * composition of the next frame right after having submitted the
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+ * current layout.
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+ */
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+
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+ if (async) {
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+ msm_queue_fence_cb(dev, &c->fence_cb, c->fence);
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+ return 0;
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+ }
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+
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+ ret = msm_wait_fence_interruptable(dev, c->fence, NULL);
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+ if (ret) {
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+ WARN_ON(ret); // TODO unswap state back? or??
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+ kfree(c);
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+ return ret;
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+ }
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+
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+ complete_commit(c);
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+
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+ return 0;
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+}
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Rob Clark