Am 22.08.2018 um 21:32 schrieb Marek Olšák:
> On Wed, Aug 22, 2018 at 12:56 PM Alex Deucher <alexdeucher at gmail.com> wrote:
>> On Wed, Aug 22, 2018 at 6:05 AM Christian König
>> <ckoenig.leichtzumerken at gmail.com> wrote:
>>> Instead of hammering hard on the GPU try a soft recovery first.
>>>
>>> v2: reorder code a bit
>>>
>>> Signed-off-by: Christian König <christian.koenig at amd.com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 6 ++++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 24 ++++++++++++++++++++++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 4 ++++
>>> 3 files changed, 34 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>>> index 265ff90f4e01..d93e31a5c4e7 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>>> @@ -33,6 +33,12 @@ static void amdgpu_job_timedout(struct drm_sched_job *s_job)
>>> struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched);
>>> struct amdgpu_job *job = to_amdgpu_job(s_job);
>>>
>>> + if (amdgpu_ring_soft_recovery(ring, job->vmid, s_job->s_fence->parent)) {
>>> + DRM_ERROR("ring %s timeout, but soft recovered\n",
>>> + s_job->sched->name);
>>> + return;
>>> + }
>> I think we should still bubble up the error to userspace even if we
>> can recover. Data is lost when the wave is killed. We should treat
>> it like a GPU reset.
> Yes, please increment gpu_reset_counter, so that we are compliant with
> OpenGL. Being able to recover from infinite loops is great, but test
> suites also expect this to be properly reported to userspace via the
> per-context query.
Sure that shouldn't be a problem.
> Also please bump the deadline to 1 second. Even you if you kill all
> shaders, the IB can also contain CP DMA, which may take longer than 1
> ms.
Is there any way we can get a feedback from the SQ if the kill was
successfully?
1 second is way to long, since in the case of a blocked MC we need to
start up hard reset relative fast.
Regards,
Christian.
>
> Marek
>
> Marek
>
>> Alex
>>
>>> +
>>> DRM_ERROR("ring %s timeout, signaled seq=%u, emitted seq=%u\n",
>>> job->base.sched->name, atomic_read(&ring->fence_drv.last_seq),
>>> ring->fence_drv.sync_seq);
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
>>> index 5dfd26be1eec..c045a4e38ad1 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
>>> @@ -383,6 +383,30 @@ void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
>>> amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);
>>> }
>>>
>>> +/**
>>> + * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
>>> + *
>>> + * @ring: ring to try the recovery on
>>> + * @vmid: VMID we try to get going again
>>> + * @fence: timedout fence
>>> + *
>>> + * Tries to get a ring proceeding again when it is stuck.
>>> + */
>>> +bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
>>> + struct dma_fence *fence)
>>> +{
>>> + ktime_t deadline = ktime_add_us(ktime_get(), 1000);
>>> +
>>> + if (!ring->funcs->soft_recovery)
>>> + return false;
>>> +
>>> + while (!dma_fence_is_signaled(fence) &&
>>> + ktime_to_ns(ktime_sub(deadline, ktime_get())) > 0)
>>> + ring->funcs->soft_recovery(ring, vmid);
>>> +
>>> + return dma_fence_is_signaled(fence);
>>> +}
>>> +
>>> /*
>>> * Debugfs info
>>> */
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>> index 409fdd9b9710..9cc239968e40 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>> @@ -168,6 +168,8 @@ struct amdgpu_ring_funcs {
>>> /* priority functions */
>>> void (*set_priority) (struct amdgpu_ring *ring,
>>> enum drm_sched_priority priority);
>>> + /* Try to soft recover the ring to make the fence signal */
>>> + void (*soft_recovery)(struct amdgpu_ring *ring, unsigned vmid);
>>> };
>>>
>>> struct amdgpu_ring {
>>> @@ -260,6 +262,8 @@ void amdgpu_ring_fini(struct amdgpu_ring *ring);
>>> void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
>>> uint32_t reg0, uint32_t val0,
>>> uint32_t reg1, uint32_t val1);
>>> +bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
>>> + struct dma_fence *fence);
>>>
>>> static inline void amdgpu_ring_clear_ring(struct amdgpu_ring *ring)
>>> {
>>> --
>>> 2.14.1
>>>
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>>> amd-gfx at lists.freedesktop.org
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