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Subject[PATCH v2 5/6] drm/msm: Remove msm_commit/worker, use atomic helper commit
Date
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

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/msm/msm_atomic.c | 153 +++++++++----------------------
drivers/gpu/drm/msm/msm_drv.c | 1 -
drivers/gpu/drm/msm/msm_drv.h | 4 -
3 files changed, 42 insertions(+), 116 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 671a18ee977d..52249565cc03 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -20,66 +20,6 @@
#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)
{
@@ -126,31 +66,37 @@ 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);
}

/**
@@ -169,17 +115,12 @@ 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
@@ -187,45 +128,39 @@ 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);
-
- drm_atomic_set_fence_for_plane(new_plane_state, fence);
- }
+ ret = drm_atomic_helper_prepare_planes(dev, state);
+ if (ret)
+ return ret;
+
+ 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);

/*
* Everything below can be run asynchronously without the need to grab
@@ -244,17 +179,13 @@ 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;
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 7e8f640062ef..d1a45a68c287 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -459,7 +459,6 @@ 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);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index c5b8c989b859..b89fa5186eb8 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -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];

--
Sean Paul, Software Engineer, Google / Chromium OS
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