From: Rob Clark robdclark@chromium.org
Use a SCHED_FIFO kthread_worker for async atomic commits. We have a hard deadline if we don't want to miss a frame.
Signed-off-by: Rob Clark robdclark@chromium.org --- drivers/gpu/drm/msm/msm_atomic.c | 25 ++++++++++++++++++++----- drivers/gpu/drm/msm/msm_drv.h | 3 ++- drivers/gpu/drm/msm/msm_kms.h | 17 +++++++++++++---- 3 files changed, 35 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c index 561bfa48841c..484438f1e028 100644 --- a/drivers/gpu/drm/msm/msm_atomic.c +++ b/drivers/gpu/drm/msm/msm_atomic.c @@ -103,14 +103,13 @@ static enum hrtimer_restart msm_atomic_pending_timer(struct hrtimer *t) { struct msm_pending_timer *timer = container_of(t, struct msm_pending_timer, timer); - struct msm_drm_private *priv = timer->kms->dev->dev_private;
- queue_work(priv->wq, &timer->work); + kthread_queue_work(timer->worker, &timer->work);
return HRTIMER_NORESTART; }
-static void msm_atomic_pending_work(struct work_struct *work) +static void msm_atomic_pending_work(struct kthread_work *work) { struct msm_pending_timer *timer = container_of(work, struct msm_pending_timer, work); @@ -118,14 +117,30 @@ static void msm_atomic_pending_work(struct work_struct *work) msm_atomic_async_commit(timer->kms, timer->crtc_idx); }
-void msm_atomic_init_pending_timer(struct msm_pending_timer *timer, +int msm_atomic_init_pending_timer(struct msm_pending_timer *timer, struct msm_kms *kms, int crtc_idx) { timer->kms = kms; timer->crtc_idx = crtc_idx; hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); timer->timer.function = msm_atomic_pending_timer; - INIT_WORK(&timer->work, msm_atomic_pending_work); + + timer->worker = kthread_create_worker(0, "atomic-worker-%d", crtc_idx); + if (IS_ERR(timer->worker)) { + int ret = PTR_ERR(timer->worker); + timer->worker = NULL; + return ret; + } + sched_set_fifo(timer->worker->task); + kthread_init_work(&timer->work, msm_atomic_pending_work); + + return 0; +} + +void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer) +{ + if (timer->worker) + kthread_destroy_worker(timer->worker); }
static bool can_do_async(struct drm_atomic_state *state, diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index 5308e636a90c..f869ed67b5da 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -235,8 +235,9 @@ struct msm_pending_timer;
int msm_atomic_prepare_fb(struct drm_plane *plane, struct drm_plane_state *new_state); -void msm_atomic_init_pending_timer(struct msm_pending_timer *timer, +int msm_atomic_init_pending_timer(struct msm_pending_timer *timer, struct msm_kms *kms, int crtc_idx); +void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer); void msm_atomic_commit_tail(struct drm_atomic_state *state); struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device *dev); void msm_atomic_state_clear(struct drm_atomic_state *state); diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h index 0be9e6487556..26321c13f950 100644 --- a/drivers/gpu/drm/msm/msm_kms.h +++ b/drivers/gpu/drm/msm/msm_kms.h @@ -136,7 +136,8 @@ struct msm_kms; */ struct msm_pending_timer { struct hrtimer timer; - struct work_struct work; + struct kthread_work work; + struct kthread_worker *worker; struct msm_kms *kms; unsigned crtc_idx; }; @@ -163,19 +164,27 @@ struct msm_kms { static inline int msm_kms_init(struct msm_kms *kms, const struct msm_kms_funcs *funcs) { - unsigned i; + unsigned i, ret;
mutex_init(&kms->commit_lock); kms->funcs = funcs;
- for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++) - msm_atomic_init_pending_timer(&kms->pending_timers[i], kms, i); + for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++) { + ret = msm_atomic_init_pending_timer(&kms->pending_timers[i], kms, i); + if (ret) { + return ret; + } + }
return 0; }
static inline void msm_kms_destroy(struct msm_kms *kms) { + unsigned i; + + for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++) + msm_atomic_destroy_pending_timer(&kms->pending_timers[i]); }
struct msm_kms *mdp4_kms_init(struct drm_device *dev);