On 2018-11-01 12:18, Sean Paul wrote:
On Wed, Oct 31, 2018 at 05:19:05PM -0700, Jeykumar Sankaran wrote:
msm maintains a separate structure to define vblank
work definitions and a list to track events submitted
to the display worker thread. We can avoid these
redundant list and its protection mechanism, if we
subclass the work object to encapsulate vblank
event parameters.
Signed-off-by: Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/msm_drv.c | 70
++++++++++++-------------------------------
drivers/gpu/drm/msm/msm_drv.h | 7 -----
2 files changed, 19 insertions(+), 58 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_drv.c
b/drivers/gpu/drm/msm/msm_drv.c
index 1f384b3..67a96ee 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -203,61 +203,44 @@ u32 msm_readl(const void __iomem *addr)
return val;
}
-struct vblank_event {
- struct list_head node;
+struct msm_vblank_work {
+ struct kthread_work work;
int crtc_id;
bool enable;
+ struct msm_drm_private *priv;
};
static void vblank_ctrl_worker(struct kthread_work *work)
{
- struct msm_vblank_ctrl *vbl_ctrl = container_of(work,
- struct msm_vblank_ctrl,
work);
- struct msm_drm_private *priv = container_of(vbl_ctrl,
- struct msm_drm_private,
vblank_ctrl);
+ struct msm_vblank_work *vbl_work = container_of(work,
+ struct msm_vblank_work,
work);
+ struct msm_drm_private *priv = vbl_work->priv;
struct msm_kms *kms = priv->kms;
- struct vblank_event *vbl_ev, *tmp;
- unsigned long flags;
-
- spin_lock_irqsave(&vbl_ctrl->lock, flags);
- list_for_each_entry_safe(vbl_ev, tmp, &vbl_ctrl->event_list, node)
{
- list_del(&vbl_ev->node);
- spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
-
- if (vbl_ev->enable)
- kms->funcs->enable_vblank(kms,
-
priv->crtcs[vbl_ev->crtc_id]);
- else
- kms->funcs->disable_vblank(kms,
-
priv->crtcs[vbl_ev->crtc_id]);
- kfree(vbl_ev);
-
- spin_lock_irqsave(&vbl_ctrl->lock, flags);
- }
+ if (vbl_work->enable)
+ kms->funcs->enable_vblank(kms,
priv->crtcs[vbl_work->crtc_id]);
+ else
+ kms->funcs->disable_vblank(kms,
priv->crtcs[vbl_work->crtc_id]);
- spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
+ kfree(vbl_work);
}
static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
int crtc_id, bool enable)
{
- struct msm_vblank_ctrl *vbl_ctrl = &priv->vblank_ctrl;
- struct vblank_event *vbl_ev;
- unsigned long flags;
+ struct msm_vblank_work *vbl_work;
- vbl_ev = kzalloc(sizeof(*vbl_ev), GFP_ATOMIC);
- if (!vbl_ev)
+ vbl_work = kzalloc(sizeof(*vbl_work), GFP_ATOMIC);
+ if (!vbl_work)
return -ENOMEM;
- vbl_ev->crtc_id = crtc_id;
- vbl_ev->enable = enable;
+ kthread_init_work(&vbl_work->work, vblank_ctrl_worker);
- spin_lock_irqsave(&vbl_ctrl->lock, flags);
- list_add_tail(&vbl_ev->node, &vbl_ctrl->event_list);
- spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
+ vbl_work->crtc_id = crtc_id;
+ vbl_work->enable = enable;
+ vbl_work->priv = priv;
- kthread_queue_work(&priv->disp_thread.worker, &vbl_ctrl->work);
+ kthread_queue_work(&priv->disp_thread.worker, &vbl_work->work);
So I think this can get even more simplified. In the short term, you
can
just
use the systemwq to do the enable and disable.
you mean priv->wq?
In the long term, the enable_vblank/disable_vblank functions should be
optimized so they don't sleep. I took a quick look at them perhaps this
is
all because of the crtc_lock mutex? That lock seems a bit suspicious to
me,
especially being dropped around the pm_runtime calls in
_dpu_crtc_vblank_enable_no_lock(). I think we could probably rely on
the
modeset
locks for some of these functions, and perhaps convert it to a spinlock
if
we
can't get rid of it entirely.
crtc_lock has a history of usage in the downstream driver. It was
introduced to protect
vblank variables when vblank requests were handled in the user thread
(not the display thread). When event threads were introduced to receive
encoder events, the lock was further expanded to protect few more vars.
It was
also needed to synchronize CRTC accesses between debugfs dump calls
and display thread.
Would like to deal with this cleanup bit later once we lose these extra
threads.
Thanks and Regards,
Jeykumar S.
Sean
return 0;
}
@@ -269,20 +252,8 @@ static int msm_drm_uninit(struct device *dev)
struct msm_drm_private *priv = ddev->dev_private;
struct msm_kms *kms = priv->kms;
struct msm_mdss *mdss = priv->mdss;
- struct msm_vblank_ctrl *vbl_ctrl = &priv->vblank_ctrl;
- struct vblank_event *vbl_ev, *tmp;
int i;
- /* We must cancel and cleanup any pending vblank enable/disable
- * work before drm_irq_uninstall() to avoid work re-enabling an
- * irq after uninstall has disabled it.
- */
- kthread_flush_work(&vbl_ctrl->work);
- list_for_each_entry_safe(vbl_ev, tmp, &vbl_ctrl->event_list, node)
{
- list_del(&vbl_ev->node);
- kfree(vbl_ev);
- }
-
kthread_flush_worker(&priv->disp_thread.worker);
kthread_stop(priv->disp_thread.thread);
priv->disp_thread.thread = NULL;
@@ -474,9 +445,6 @@ static int msm_drm_init(struct device *dev, struct
drm_driver *drv)
priv->wq = alloc_ordered_workqueue("msm", 0);
INIT_LIST_HEAD(&priv->inactive_list);
- INIT_LIST_HEAD(&priv->vblank_ctrl.event_list);
- kthread_init_work(&priv->vblank_ctrl.work, vblank_ctrl_worker);
- spin_lock_init(&priv->vblank_ctrl.lock);
drm_mode_config_init(ddev);
diff --git a/drivers/gpu/drm/msm/msm_drv.h
b/drivers/gpu/drm/msm/msm_drv.h
index e81b1fa..b91e306 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -77,12 +77,6 @@ enum msm_mdp_plane_property {
PLANE_PROP_MAX_NUM
};
-struct msm_vblank_ctrl {
- struct kthread_work work;
- struct list_head event_list;
- spinlock_t lock;
-};
-
#define MSM_GPU_MAX_RINGS 4
#define MAX_H_TILES_PER_DISPLAY 2
@@ -226,7 +220,6 @@ struct msm_drm_private {
struct notifier_block vmap_notifier;
struct shrinker shrinker;
- struct msm_vblank_ctrl vblank_ctrl;
struct drm_atomic_state *pm_state;
};
--
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Forum,
a Linux Foundation Collaborative Project
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--
Jeykumar S
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