* [PATCH v3 0/2] drm/msm/gpu: System suspend fixes
@ 2022-01-08 18:09 Rob Clark
2022-01-08 18:09 ` [PATCH v3 1/2] drm/msm/gpu: Wait for idle before suspending Rob Clark
2022-01-08 18:09 ` [PATCH v3 2/2] drm/msm/gpu: Cancel idle/boost work on suspend Rob Clark
0 siblings, 2 replies; 3+ messages in thread
From: Rob Clark @ 2022-01-08 18:09 UTC (permalink / raw)
To: dri-devel
Cc: freedreno, linux-arm-msm, Rob Clark, Abhinav Kumar,
Akhil P Oommen, AngeloGioacchino Del Regno, Bjorn Andersson,
Jonathan Marek, Jordan Crouse, open list, Vladimir Lypak
From: Rob Clark <robdclark@chromium.org>
Because system suspend uses pm_runtime_force_suspend() we can't rely
runpm refcnt's to protect us if the GPU is active, etc. Fortunately
*usually* the GPU is idle when system suspend is triggered. But that
isn't quite good enough.
The first patch attempts to block for a modest amount of time until GPU
is idle (and failing that, returns -EBUSY). We could have taken a
slightly easier approach and just returned -EBUSY if GPU is not idle,
but that would cause system suspend to fail. And no one likes pulling
a hot laptop out of their backpack.
The second patch avoids getting devfreq callbacks after suspend, since
pm_runtime_force_suspend() breaks the pm_runtime_get_if_in_use() tricks
used to deal with devfreq callbacks while suspended.
Rob Clark (2):
drm/msm/gpu: Wait for idle before suspending
drm/msm/gpu: Cancel idle/boost work on suspend
drivers/gpu/drm/msm/adreno/adreno_device.c | 18 ++++++++++++++++++
drivers/gpu/drm/msm/msm_gpu.c | 3 +++
drivers/gpu/drm/msm/msm_gpu.h | 3 +++
drivers/gpu/drm/msm/msm_gpu_devfreq.c | 21 +++++++++++++++++++--
4 files changed, 43 insertions(+), 2 deletions(-)
--
2.33.1
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v3 1/2] drm/msm/gpu: Wait for idle before suspending
2022-01-08 18:09 [PATCH v3 0/2] drm/msm/gpu: System suspend fixes Rob Clark
@ 2022-01-08 18:09 ` Rob Clark
2022-01-08 18:09 ` [PATCH v3 2/2] drm/msm/gpu: Cancel idle/boost work on suspend Rob Clark
1 sibling, 0 replies; 3+ messages in thread
From: Rob Clark @ 2022-01-08 18:09 UTC (permalink / raw)
To: dri-devel
Cc: freedreno, linux-arm-msm, Rob Clark, Bjorn Andersson,
AngeloGioacchino Del Regno, Rob Clark, Sean Paul, Abhinav Kumar,
David Airlie, Daniel Vetter, Jonathan Marek, Akhil P Oommen,
Vladimir Lypak, open list
From: Rob Clark <robdclark@chromium.org>
System suspend uses pm_runtime_force_suspend(), which cheekily bypasses
the runpm reference counts. This doesn't actually work so well when the
GPU is active. So add a reasonable delay waiting for the GPU to become
idle.
Alternatively we could just return -EBUSY in this case, but that has the
disadvantage of causing system suspend to fail.
v2: s/ret/remaining [sboyd], and switch to using active_submits count
to ensure we aren't racing with submit cleanup (and devfreq idle
work getting scheduled, etc)
v3: fix inverted logic
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
drivers/gpu/drm/msm/adreno/adreno_device.c | 18 ++++++++++++++++++
drivers/gpu/drm/msm/msm_gpu.c | 3 +++
drivers/gpu/drm/msm/msm_gpu.h | 3 +++
3 files changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 93005839b5da..fb261930ad1c 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -608,9 +608,27 @@ static int adreno_resume(struct device *dev)
return gpu->funcs->pm_resume(gpu);
}
+static int active_submits(struct msm_gpu *gpu)
+{
+ int active_submits;
+ mutex_lock(&gpu->active_lock);
+ active_submits = gpu->active_submits;
+ mutex_unlock(&gpu->active_lock);
+ return active_submits;
+}
+
static int adreno_suspend(struct device *dev)
{
struct msm_gpu *gpu = dev_to_gpu(dev);
+ int remaining;
+
+ remaining = wait_event_timeout(gpu->retire_event,
+ active_submits(gpu) == 0,
+ msecs_to_jiffies(1000));
+ if (remaining == 0) {
+ dev_err(dev, "Timeout waiting for GPU to suspend\n");
+ return -EBUSY;
+ }
return gpu->funcs->pm_suspend(gpu);
}
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 0f78c2615272..2c1049c0ea14 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -703,6 +703,8 @@ static void retire_submits(struct msm_gpu *gpu)
}
}
}
+
+ wake_up_all(&gpu->retire_event);
}
static void retire_worker(struct kthread_work *work)
@@ -848,6 +850,7 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
INIT_LIST_HEAD(&gpu->active_list);
mutex_init(&gpu->active_lock);
mutex_init(&gpu->lock);
+ init_waitqueue_head(&gpu->retire_event);
kthread_init_work(&gpu->retire_work, retire_worker);
kthread_init_work(&gpu->recover_work, recover_worker);
kthread_init_work(&gpu->fault_work, fault_worker);
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 445c6bfd4b6b..92aa1e9196c6 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -230,6 +230,9 @@ struct msm_gpu {
/* work for handling GPU recovery: */
struct kthread_work recover_work;
+ /** retire_event: notified when submits are retired: */
+ wait_queue_head_t retire_event;
+
/* work for handling active-list retiring: */
struct kthread_work retire_work;
--
2.33.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH v3 2/2] drm/msm/gpu: Cancel idle/boost work on suspend
2022-01-08 18:09 [PATCH v3 0/2] drm/msm/gpu: System suspend fixes Rob Clark
2022-01-08 18:09 ` [PATCH v3 1/2] drm/msm/gpu: Wait for idle before suspending Rob Clark
@ 2022-01-08 18:09 ` Rob Clark
1 sibling, 0 replies; 3+ messages in thread
From: Rob Clark @ 2022-01-08 18:09 UTC (permalink / raw)
To: dri-devel
Cc: freedreno, linux-arm-msm, Rob Clark, Rob Clark, Sean Paul,
Abhinav Kumar, David Airlie, Daniel Vetter, open list
From: Rob Clark <robdclark@chromium.org>
With system suspend using pm_runtime_force_suspend() we can't rely on
the pm_runtime_get_if_in_use() trick to deal with devfreq callbacks
after (or racing with) suspend. So flush any pending idle or boost
work in the suspend path.
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/msm/msm_gpu_devfreq.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index 62405e980925..9bf319be11f6 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -133,6 +133,18 @@ void msm_devfreq_init(struct msm_gpu *gpu)
CLOCK_MONOTONIC, HRTIMER_MODE_REL);
}
+static void cancel_idle_work(struct msm_gpu_devfreq *df)
+{
+ hrtimer_cancel(&df->idle_work.timer);
+ kthread_cancel_work_sync(&df->idle_work.work);
+}
+
+static void cancel_boost_work(struct msm_gpu_devfreq *df)
+{
+ hrtimer_cancel(&df->boost_work.timer);
+ kthread_cancel_work_sync(&df->boost_work.work);
+}
+
void msm_devfreq_cleanup(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
@@ -152,7 +164,12 @@ void msm_devfreq_resume(struct msm_gpu *gpu)
void msm_devfreq_suspend(struct msm_gpu *gpu)
{
- devfreq_suspend_device(gpu->devfreq.devfreq);
+ struct msm_gpu_devfreq *df = &gpu->devfreq;
+
+ devfreq_suspend_device(df->devfreq);
+
+ cancel_idle_work(df);
+ cancel_boost_work(df);
}
static void msm_devfreq_boost_work(struct kthread_work *work)
@@ -196,7 +213,7 @@ void msm_devfreq_active(struct msm_gpu *gpu)
/*
* Cancel any pending transition to idle frequency:
*/
- hrtimer_cancel(&df->idle_work.timer);
+ cancel_idle_work(df);
idle_time = ktime_to_ms(ktime_sub(ktime_get(), df->idle_time));
--
2.33.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2022-01-08 18:09 [PATCH v3 0/2] drm/msm/gpu: System suspend fixes Rob Clark
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