msm: sde: Convert workq to kernel thread in SDE rotator
Fix performance issue in SDE rotator by coverting workq into kernel
thread. workq priority is not high enough and can be easily preempted.
For sde rotator being used for realtime deadline usecase, it is
necessary to move up the priority of the worker thread, and we need to
move into kernel thread to handle the works.
Change-Id: Id77e80cb69162326a3894a41bec295bb9bd7f5c1
Signed-off-by: Benjamin Chan <bkchan@codeaurora.org>
diff --git a/drivers/media/platform/msm/sde/rotator/sde_rotator_core.h b/drivers/media/platform/msm/sde/rotator/sde_rotator_core.h
index 7b8a066..731ff1e 100644
--- a/drivers/media/platform/msm/sde/rotator/sde_rotator_core.h
+++ b/drivers/media/platform/msm/sde/rotator/sde_rotator_core.h
@@ -21,7 +21,7 @@
#include <linux/types.h>
#include <linux/cdev.h>
#include <linux/pm_runtime.h>
-#include <linux/completion.h>
+#include <linux/kthread.h>
#include "sde_rotator_base.h"
#include "sde_rotator_util.h"
@@ -230,7 +230,8 @@
};
struct sde_rot_queue {
- struct workqueue_struct *rot_work_queue;
+ struct kthread_worker rot_kw;
+ struct task_struct *rot_thread;
struct sde_rot_timeline *timeline;
struct sde_rot_hw_resource *hw;
};
@@ -253,8 +254,8 @@
u32 count;
atomic_t pending_count;
atomic_t failed_count;
- struct workqueue_struct *retireq;
- struct work_struct *retire_work;
+ struct kthread_worker *retire_kw;
+ struct kthread_work *retire_work;
bool finished;
struct sde_rot_entry *entries;
};
@@ -284,8 +285,8 @@
*/
struct sde_rot_entry {
struct sde_rotation_item item;
- struct work_struct commit_work;
- struct work_struct done_work;
+ struct kthread_work commit_work;
+ struct kthread_work done_work;
struct sde_rot_queue *commitq;
struct sde_rot_queue *fenceq;
struct sde_rot_queue *doneq;