[AMD Official Use Only - Internal Distribution Only] well, submit job with HW disabled shluld be no harm.
The only concern is that we might use up IBs if we park scheduler during recovery. I have saw recovery stuck in sa new functuon. ring test alloc IBs to test if recovery succeed or not. But if there is no enough IBs it will wait fences to signal. However we have parked the scheduler thread, the job will never run and no fences will be signaled. see, deadlock indeed. Now we are allowing job submission here. it is more likely that IBs might be used up. ________________________________ From: Koenig, Christian <[email protected]> Sent: Wednesday, March 25, 2020 7:13:13 PM To: Das, Nirmoy <[email protected]> Cc: Pan, Xinhui <[email protected]>; [email protected] <[email protected]>; Deucher, Alexander <[email protected]>; Kuehling, Felix <[email protected]> Subject: Re: [PATCH] drm/amdgpu: Check entity rq Hi guys, thanks for pointing this out Nirmoy. Yeah, could be that I forgot to commit the patch. Currently I don't know at which end of the chaos I should start to clean up. Christian. Am 25.03.2020 12:09 schrieb "Das, Nirmoy" <[email protected]>: Hi Xinhui, Can you please check if you can reproduce the crash with https://lists.freedesktop.org/archives/amd-gfx/2020-February/046414.html Christian fix it earlier, I think he forgot to push it. Regards, Nirmoy On 3/25/20 12:07 PM, xinhui pan wrote: > gpu recover will call sdma suspend/resume. In this period, ring will be > disabled. So the vm_pte_scheds(sdma.instance[X].ring.sched)->ready will > be false. > > If we submit any jobs in this ring-disabled period. We fail to pick up > a rq for vm entity and entity->rq will set to NULL. > amdgpu_vm_sdma_commit did not check the entity->rq, so fix it. Otherwise > hit panic. > > Cc: Christian König <[email protected]> > Cc: Alex Deucher <[email protected]> > Cc: Felix Kuehling <[email protected]> > Signed-off-by: xinhui pan <[email protected]> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > index cf96c335b258..d30d103e48a2 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > @@ -95,6 +95,8 @@ static int amdgpu_vm_sdma_commit(struct > amdgpu_vm_update_params *p, > int r; > > entity = p->direct ? &p->vm->direct : &p->vm->delayed; > + if (!entity->rq) > + return -ENOENT; > ring = container_of(entity->rq->sched, struct amdgpu_ring, sched); > > WARN_ON(ib->length_dw == 0); Am 25.03.2020 12:09 schrieb "Das, Nirmoy" <[email protected]>: Hi Xinhui, Can you please check if you can reproduce the crash with https://lists.freedesktop.org/archives/amd-gfx/2020-February/046414.html Christian fix it earlier, I think he forgot to push it. Regards, Nirmoy On 3/25/20 12:07 PM, xinhui pan wrote: > gpu recover will call sdma suspend/resume. In this period, ring will be > disabled. So the vm_pte_scheds(sdma.instance[X].ring.sched)->ready will > be false. > > If we submit any jobs in this ring-disabled period. We fail to pick up > a rq for vm entity and entity->rq will set to NULL. > amdgpu_vm_sdma_commit did not check the entity->rq, so fix it. Otherwise > hit panic. > > Cc: Christian König <[email protected]> > Cc: Alex Deucher <[email protected]> > Cc: Felix Kuehling <[email protected]> > Signed-off-by: xinhui pan <[email protected]> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > index cf96c335b258..d30d103e48a2 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > @@ -95,6 +95,8 @@ static int amdgpu_vm_sdma_commit(struct > amdgpu_vm_update_params *p, > int r; > > entity = p->direct ? &p->vm->direct : &p->vm->delayed; > + if (!entity->rq) > + return -ENOENT; > ring = container_of(entity->rq->sched, struct amdgpu_ring, sched); > > WARN_ON(ib->length_dw == 0); Am 25.03.2020 12:09 schrieb "Das, Nirmoy" <[email protected]>: Hi Xinhui, Can you please check if you can reproduce the crash with https://lists.freedesktop.org/archives/amd-gfx/2020-February/046414.html Christian fix it earlier, I think he forgot to push it. Regards, Nirmoy On 3/25/20 12:07 PM, xinhui pan wrote: > gpu recover will call sdma suspend/resume. In this period, ring will be > disabled. So the vm_pte_scheds(sdma.instance[X].ring.sched)->ready will > be false. > > If we submit any jobs in this ring-disabled period. We fail to pick up > a rq for vm entity and entity->rq will set to NULL. > amdgpu_vm_sdma_commit did not check the entity->rq, so fix it. Otherwise > hit panic. > > Cc: Christian König <[email protected]> > Cc: Alex Deucher <[email protected]> > Cc: Felix Kuehling <[email protected]> > Signed-off-by: xinhui pan <[email protected]> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > index cf96c335b258..d30d103e48a2 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c > @@ -95,6 +95,8 @@ static int amdgpu_vm_sdma_commit(struct > amdgpu_vm_update_params *p, > int r; > > entity = p->direct ? &p->vm->direct : &p->vm->delayed; > + if (!entity->rq) > + return -ENOENT; > ring = container_of(entity->rq->sched, struct amdgpu_ring, sched); > > WARN_ON(ib->length_dw == 0);
_______________________________________________ amd-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/amd-gfx
