What about this for fill_buffer():
if (ring->ready != true && !adev->in_gpu_reset) {
return -EINVAL;
}
/Monk
-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Liu, Monk
Sent: 2018å¹´2æ??28æ?¥ 20:35
To: Koenig, Christian <Christian.Koenig at amd.com>; amd-gfx at lists.freedesktop.org
Subject: RE: [PATCH 3/4] drm/amdgpu: don't return when ring not ready for fill_buffer
Because when SDMA was hang by like process A, and meanwhile another process B is already running into the code of fill_buffer() So just let process B continue, don't block it otherwise process B would fail by software reason .
Let it run and finally process B's job would fail and GPU recover will repeat it again (since it is a kernel job)
Without this solution other process will be greatly harmed by one black sheep that triggering GPU recover
/Monk
-----Original Message-----
From: Christian König [mailto:ckoenig.leichtzumerken@xxxxxxxxx]
Sent: 2018å¹´2æ??28æ?¥ 20:24
To: Liu, Monk <Monk.Liu at amd.com>; amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH 3/4] drm/amdgpu: don't return when ring not ready for fill_buffer
Am 28.02.2018 um 08:21 schrieb Monk Liu:
> because this time SDMA may under GPU RESET so its ring->ready may not
> true, keep going and GPU scheduler will reschedule this job if it
> failed.
>
> give a warning on copy_buffer when go through direct_submit while
> ring->ready is false
NAK, that test has already saved us quite a bunch of trouble with the fb layer.
Why exactly are you running into issues with that?
Christian.
>
> Change-Id: Ife6cd55e0e843d99900e5bed5418499e88633685
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 6 +-----
> 1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index e38e6db..7b75ac9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -1656,6 +1656,7 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
> amdgpu_ring_pad_ib(ring, &job->ibs[0]);
> WARN_ON(job->ibs[0].length_dw > num_dw);
> if (direct_submit) {
> + WARN_ON(!ring->ready);
> r = amdgpu_ib_schedule(ring, job->num_ibs, job->ibs,
> NULL, fence);
> job->fence = dma_fence_get(*fence); @@ -1692,11 +1693,6 @@ int
> amdgpu_fill_buffer(struct amdgpu_bo *bo,
> struct amdgpu_job *job;
> int r;
>
> - if (!ring->ready) {
> - DRM_ERROR("Trying to clear memory with ring turned off.\n");
> - return -EINVAL;
> - }
> -
> if (bo->tbo.mem.mem_type == TTM_PL_TT) {
> r = amdgpu_ttm_alloc_gart(&bo->tbo);
> if (r)
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