Good point, but in this case we need some other handling. Please change the test to use ring->ring_obj instead, this way we still bail out if somebody tries to submit commands before the ring is even allocated. And you also need to fix a couple of other places in amdgpu_ttm.c. Regards, Christian. Am 28.02.2018 um 13:34 schrieb Liu, Monk: > 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 at gmail.com] > 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)
