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Commit 70db18dc authored by Sean Paul's avatar Sean Paul Committed by Rob Clark
Browse files

drm/msm: Remove msm_commit/worker, use atomic helper commit 



Moving further towards switching fully to the the atomic helpers, this
patch removes the hand-rolled worker nonblock commit code and uses the
atomic helpers commit_work model.

Changes in v2:
- Remove commit_destroy()
- Shuffle order of commit_tail calls to further serialize commits
- Use stall in swap_state to avoid abandoned events on disable
Changes in v3:
- Rebased on Archit's private_obj set
Changes in v4:
- None

Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
parent e765ea77

drivers/gpu/drm/msm/msm_atomic.c

+42 −111
Original line number Diff line number Diff line
@@ -21,66 +21,6 @@ 
#include "msm_gem.h"

#include "msm_fence.h"



struct msm_commit {

	struct drm_device *dev;

	struct drm_atomic_state *state;

	struct work_struct work;

	uint32_t crtc_mask;

};



static void commit_worker(struct work_struct *work);



/* block until specified crtcs are no longer pending update, and

 * atomically mark them as pending update

 */

static int start_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)

{

	int ret;



	spin_lock(&priv->pending_crtcs_event.lock);

	ret = wait_event_interruptible_locked(priv->pending_crtcs_event,

			!(priv->pending_crtcs & crtc_mask));

	if (ret == 0) {

		DBG("start: %08x", crtc_mask);

		priv->pending_crtcs |= crtc_mask;

	}

	spin_unlock(&priv->pending_crtcs_event.lock);



	return ret;

}



/* clear specified crtcs (no longer pending update)

 */

static void end_atomic(struct msm_drm_private *priv, uint32_t crtc_mask)

{

	spin_lock(&priv->pending_crtcs_event.lock);

	DBG("end: %08x", crtc_mask);

	priv->pending_crtcs &= ~crtc_mask;

	wake_up_all_locked(&priv->pending_crtcs_event);

	spin_unlock(&priv->pending_crtcs_event.lock);

}



static struct msm_commit *commit_init(struct drm_atomic_state *state)

{

	struct msm_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);



	if (!c)

		return NULL;



	c->dev = state->dev;

	c->state = state;



	INIT_WORK(&c->work, commit_worker);



	return c;

}



static void commit_destroy(struct msm_commit *c)

{

	end_atomic(c->dev->dev_private, c->crtc_mask);

	kfree(c);

}



static void msm_atomic_wait_for_commit_done(struct drm_device *dev,

		struct drm_atomic_state *old_state)

{
@@ -148,31 +88,37 @@ static void msm_atomic_commit_tail(struct drm_atomic_state *state) 


	msm_atomic_wait_for_commit_done(dev, state);



	drm_atomic_helper_cleanup_planes(dev, state);



	kms->funcs->complete_commit(kms, state);



	drm_atomic_helper_wait_for_vblanks(dev, state);



	drm_atomic_helper_commit_hw_done(state);



	drm_atomic_helper_cleanup_planes(dev, state);

}



/* The (potentially) asynchronous part of the commit.  At this point

 * nothing can fail short of armageddon.

 */

static void complete_commit(struct msm_commit *c)

static void commit_tail(struct drm_atomic_state *state)

{

	struct drm_atomic_state *state = c->state;

	struct drm_device *dev = state->dev;

	drm_atomic_helper_wait_for_fences(state->dev, state, false);



	drm_atomic_helper_wait_for_fences(dev, state, false);

	drm_atomic_helper_wait_for_dependencies(state);



	msm_atomic_commit_tail(state);



	drm_atomic_state_put(state);

	drm_atomic_helper_commit_cleanup_done(state);



	commit_destroy(c);

	drm_atomic_state_put(state);

}



static void commit_worker(struct work_struct *work)

static void commit_work(struct work_struct *work)

{

	complete_commit(container_of(work, struct msm_commit, work));

	struct drm_atomic_state *state = container_of(work,

						      struct drm_atomic_state,

						      commit_work);

	commit_tail(state);

}



/**
@@ -191,17 +137,12 @@ int msm_atomic_commit(struct drm_device *dev, 
		struct drm_atomic_state *state, bool nonblock)

{

	struct msm_drm_private *priv = dev->dev_private;

	struct msm_commit *c;

	struct drm_crtc *crtc;

	struct drm_crtc_state *crtc_state;

	struct drm_plane *plane;

	struct drm_plane_state *old_plane_state, *new_plane_state;

	int i, ret;



	ret = drm_atomic_helper_prepare_planes(dev, state);

	if (ret)

		return ret;



	/*

	 * Note that plane->atomic_async_check() should fail if we need

	 * to re-assign hwpipe or anything that touches global atomic
@@ -209,45 +150,39 @@ int msm_atomic_commit(struct drm_device *dev, 
	 * cases.

	 */

	if (state->async_update) {

		ret = drm_atomic_helper_prepare_planes(dev, state);

		if (ret)

			return ret;



		drm_atomic_helper_async_commit(dev, state);

		drm_atomic_helper_cleanup_planes(dev, state);

		return 0;

	}



	c = commit_init(state);

	if (!c) {

		ret = -ENOMEM;

		goto error;

	}

	ret = drm_atomic_helper_setup_commit(state, nonblock);

	if (ret)

		return ret;



	/*

	 * Figure out what crtcs we have:

	 */

	for_each_new_crtc_in_state(state, crtc, crtc_state, i)

		c->crtc_mask |= drm_crtc_mask(crtc);

	INIT_WORK(&state->commit_work, commit_work);



	/*

	 * Figure out what fence to wait for:

	 */

	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {

		if ((new_plane_state->fb != old_plane_state->fb) && new_plane_state->fb) {

			struct drm_gem_object *obj = msm_framebuffer_bo(new_plane_state->fb, 0);

			struct msm_gem_object *msm_obj = to_msm_bo(obj);

			struct dma_fence *fence = reservation_object_get_excl_rcu(msm_obj->resv);

	ret = drm_atomic_helper_prepare_planes(dev, state);

	if (ret)

		return ret;



			drm_atomic_set_fence_for_plane(new_plane_state, fence);

		}

	if (!nonblock) {

		ret = drm_atomic_helper_wait_for_fences(dev, state, true);

		if (ret)

			goto error;

	}



	/*

	 * Wait for pending updates on any of the same crtc's and then

	 * mark our set of crtc's as busy:

	 * This is the point of no return - everything below never fails except

	 * when the hw goes bonghits. Which means we can commit the new state on

	 * the software side now.

	 *

	 * swap driver private state while still holding state_lock

	 */

	ret = start_atomic(dev->dev_private, c->crtc_mask);

	if (ret)

		goto err_free;



	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);

	BUG_ON(drm_atomic_helper_swap_state(state, true) < 0);



	/*

	 * This is the point of no return - everything below never fails except
@@ -272,17 +207,13 @@ int msm_atomic_commit(struct drm_device *dev, 
	 */



	drm_atomic_state_get(state);

	if (nonblock) {

		queue_work(priv->atomic_wq, &c->work);

		return 0;

	}



	complete_commit(c);

	if (nonblock)

		queue_work(system_unbound_wq, &state->commit_work);

	else

		commit_tail(state);



	return 0;



err_free:

	kfree(c);

error:

	drm_atomic_helper_cleanup_planes(dev, state);

	return ret;

drivers/gpu/drm/msm/msm_drv.c

+0 −1
Original line number Diff line number Diff line
@@ -381,7 +381,6 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv) 


	priv->wq = alloc_ordered_workqueue("msm", 0);

	priv->atomic_wq = alloc_ordered_workqueue("msm:atomic", 0);

	init_waitqueue_head(&priv->pending_crtcs_event);



	INIT_LIST_HEAD(&priv->inactive_list);

	INIT_LIST_HEAD(&priv->vblank_ctrl.event_list);

drivers/gpu/drm/msm/msm_drv.h

+0 −4
Original line number Diff line number Diff line
@@ -117,10 +117,6 @@ struct msm_drm_private { 
	struct workqueue_struct *wq;

	struct workqueue_struct *atomic_wq;



	/* crtcs pending async atomic updates: */

	uint32_t pending_crtcs;

	wait_queue_head_t pending_crtcs_event;



	unsigned int num_planes;

	struct drm_plane *planes[16];