272 lines
7.1 KiB
C
272 lines
7.1 KiB
C
/*
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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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#include "msm_drv.h"
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#include "msm_kms.h"
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#include "msm_gem.h"
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#include "msm_fence.h"
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struct msm_commit {
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struct drm_device *dev;
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struct drm_atomic_state *state;
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struct work_struct work;
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uint32_t crtc_mask;
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};
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static void commit_worker(struct work_struct *work);
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/* block until specified crtcs are no longer pending update, and
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* atomically mark them as pending update
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*/
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static int start_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)
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{
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int ret;
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spin_lock(&priv->pending_crtcs_event.lock);
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ret = wait_event_interruptible_locked(priv->pending_crtcs_event,
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!(priv->pending_crtcs & crtc_mask));
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if (ret == 0) {
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DBG("start: %08x", crtc_mask);
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priv->pending_crtcs |= crtc_mask;
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}
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spin_unlock(&priv->pending_crtcs_event.lock);
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return ret;
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}
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/* clear specified crtcs (no longer pending update)
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*/
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static void end_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)
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{
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spin_lock(&priv->pending_crtcs_event.lock);
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DBG("end: %08x", crtc_mask);
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priv->pending_crtcs &= ~crtc_mask;
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wake_up_all_locked(&priv->pending_crtcs_event);
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spin_unlock(&priv->pending_crtcs_event.lock);
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}
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static struct msm_commit *commit_init(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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if (!c)
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return NULL;
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c->dev = state->dev;
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c->state = state;
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INIT_WORK(&c->work, commit_worker);
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return c;
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}
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static void commit_destroy(struct msm_commit *c)
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{
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end_atomic(c->dev->dev_private, c->crtc_mask);
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kfree(c);
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}
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static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
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struct drm_atomic_state *old_state)
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{
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struct drm_crtc *crtc;
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struct drm_crtc_state *crtc_state;
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struct msm_drm_private *priv = old_state->dev->dev_private;
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struct msm_kms *kms = priv->kms;
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int i;
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for_each_crtc_in_state(old_state, crtc, crtc_state, i) {
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if (!crtc->state->enable)
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continue;
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/* Legacy cursor ioctls are completely unsynced, and userspace
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* relies on that (by doing tons of cursor updates). */
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if (old_state->legacy_cursor_update)
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continue;
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kms->funcs->wait_for_crtc_commit_done(kms, crtc);
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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, bool async)
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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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struct msm_drm_private *priv = dev->dev_private;
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struct msm_kms *kms = priv->kms;
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drm_atomic_helper_wait_for_fences(dev, state);
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kms->funcs->prepare_commit(kms, state);
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drm_atomic_helper_commit_modeset_disables(dev, state);
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drm_atomic_helper_commit_planes(dev, state, false);
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drm_atomic_helper_commit_modeset_enables(dev, state);
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/* NOTE: _wait_for_vblanks() only waits for vblank on
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* enabled CRTCs. So we end up faulting when disabling
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* due to (potentially) unref'ing the outgoing fb's
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* before the vblank when the disable has latched.
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*
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* But if it did wait on disabled (or newly disabled)
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* CRTCs, that would be racy (ie. we could have missed
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* the irq. We need some way to poll for pipe shut
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* down. Or just live with occasionally hitting the
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* timeout in the CRTC disable path (which really should
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* not be critical path)
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*/
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msm_atomic_wait_for_commit_done(dev, state);
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drm_atomic_helper_cleanup_planes(dev, state);
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kms->funcs->complete_commit(kms, state);
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drm_atomic_state_free(state);
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commit_destroy(c);
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}
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static void commit_worker(struct work_struct *work)
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{
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complete_commit(container_of(work, struct msm_commit, work), true);
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}
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int msm_atomic_check(struct drm_device *dev,
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struct drm_atomic_state *state)
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{
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int ret;
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/*
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* msm ->atomic_check can update ->mode_changed for pixel format
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* changes, hence must be run before we check the modeset changes.
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*/
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ret = drm_atomic_helper_check_planes(dev, state);
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if (ret)
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return ret;
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ret = drm_atomic_helper_check_modeset(dev, state);
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if (ret)
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return ret;
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return ret;
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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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* @nonblock: nonblocking 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.
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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 nonblock)
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{
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struct msm_drm_private *priv = dev->dev_private;
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struct msm_commit *c;
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struct drm_crtc *crtc;
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struct drm_crtc_state *crtc_state;
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struct drm_plane *plane;
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struct drm_plane_state *plane_state;
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int i, ret;
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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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c = commit_init(state);
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if (!c) {
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ret = -ENOMEM;
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goto error;
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}
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/*
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* Figure out what crtcs we have:
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*/
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for_each_crtc_in_state(state, crtc, crtc_state, i)
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c->crtc_mask |= drm_crtc_mask(crtc);
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/*
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* Figure out what fence to wait for:
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*/
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for_each_plane_in_state(state, plane, plane_state, i) {
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if ((plane->state->fb != plane_state->fb) && plane_state->fb) {
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struct drm_gem_object *obj = msm_framebuffer_bo(plane_state->fb, 0);
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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plane_state->fence = reservation_object_get_excl_rcu(msm_obj->resv);
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}
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}
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/*
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* Wait for pending updates on any of the same crtc's and then
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* mark our set of crtc's as busy:
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*/
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ret = start_atomic(dev->dev_private, c->crtc_mask);
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if (ret) {
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kfree(c);
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goto error;
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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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drm_atomic_helper_swap_state(state, true);
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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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if (nonblock) {
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queue_work(priv->atomic_wq, &c->work);
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return 0;
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}
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complete_commit(c, false);
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return 0;
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error:
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drm_atomic_helper_cleanup_planes(dev, state);
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return ret;
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}
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