Re: [PATCH 10/13] drm/amdgpu: use scheduler depenencies for CS

[Luben Tuikov <luben.tuikov@amd.com>]

On 2022-12-21 10:34, Mike Lothian wrote:
> On Fri, 14 Oct 2022 at 09:47, Christian König
> <ckoenig.leichtzumerken@gmail.com> wrote:
>>
>> Entirely remove the sync obj in the job.
>>
>> Signed-off-by: Christian König <christian.koenig@amd.com>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c  | 21 ++++++++++-----------
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h  |  2 ++
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_job.c |  9 +--------
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_job.h |  1 -
>>  4 files changed, 13 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> index d45b86bcf7fa..0528c2b1db6e 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> @@ -426,7 +426,7 @@ static int amdgpu_cs_p2_dependencies(struct amdgpu_cs_parser *p,
>>                         dma_fence_put(old);
>>                 }
>>
>> -               r = amdgpu_sync_fence(&p->gang_leader->sync, fence);
>> +               r = amdgpu_sync_fence(&p->sync, fence);
>>                 dma_fence_put(fence);
>>                 if (r)
>>                         return r;
>> @@ -448,7 +448,7 @@ static int amdgpu_syncobj_lookup_and_add(struct amdgpu_cs_parser *p,
>>                 return r;
>>         }
>>
>> -       r = amdgpu_sync_fence(&p->gang_leader->sync, fence);
>> +       r = amdgpu_sync_fence(&p->sync, fence);
>>         if (r)
>>                 goto error;
>>
>> @@ -1108,7 +1108,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
>>         if (r)
>>                 return r;
>>
>> -       r = amdgpu_sync_fence(&job->sync, fpriv->prt_va->last_pt_update);
>> +       r = amdgpu_sync_fence(&p->sync, fpriv->prt_va->last_pt_update);
>>         if (r)
>>                 return r;
>>
>> @@ -1119,7 +1119,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
>>                 if (r)
>>                         return r;
>>
>> -               r = amdgpu_sync_fence(&job->sync, bo_va->last_pt_update);
>> +               r = amdgpu_sync_fence(&p->sync, bo_va->last_pt_update);
>>                 if (r)
>>                         return r;
>>         }
>> @@ -1138,7 +1138,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
>>                 if (r)
>>                         return r;
>>
>> -               r = amdgpu_sync_fence(&job->sync, bo_va->last_pt_update);
>> +               r = amdgpu_sync_fence(&p->sync, bo_va->last_pt_update);
>>                 if (r)
>>                         return r;
>>         }
>> @@ -1151,7 +1151,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
>>         if (r)
>>                 return r;
>>
>> -       r = amdgpu_sync_fence(&job->sync, vm->last_update);
>> +       r = amdgpu_sync_fence(&p->sync, vm->last_update);
>>         if (r)
>>                 return r;
>>
>> @@ -1183,7 +1183,6 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
>>  static int amdgpu_cs_sync_rings(struct amdgpu_cs_parser *p)
>>  {
>>         struct amdgpu_fpriv *fpriv = p->filp->driver_priv;
>> -       struct amdgpu_job *leader = p->gang_leader;
>>         struct amdgpu_bo_list_entry *e;
>>         unsigned int i;
>>         int r;
>> @@ -1195,14 +1194,14 @@ static int amdgpu_cs_sync_rings(struct amdgpu_cs_parser *p)
>>
>>                 sync_mode = amdgpu_bo_explicit_sync(bo) ?
>>                         AMDGPU_SYNC_EXPLICIT : AMDGPU_SYNC_NE_OWNER;
>> -               r = amdgpu_sync_resv(p->adev, &leader->sync, resv, sync_mode,
>> +               r = amdgpu_sync_resv(p->adev, &p->sync, resv, sync_mode,
>>                                      &fpriv->vm);
>>                 if (r)
>>                         return r;
>>         }
>>
>> -       for (i = 0; i < p->gang_size - 1; ++i) {
>> -               r = amdgpu_sync_clone(&leader->sync, &p->jobs[i]->sync);
>> +       for (i = 0; i < p->gang_size; ++i) {
>> +               r = amdgpu_sync_push_to_job(&p->sync, p->jobs[i]);
>>                 if (r)
>>                         return r;
>>         }
>> @@ -1248,7 +1247,7 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
>>                 struct dma_fence *fence;
>>
>>                 fence = &p->jobs[i]->base.s_fence->scheduled;
>> -               r = amdgpu_sync_fence(&leader->sync, fence);
>> +               r = drm_sched_job_add_dependency(&leader->base, fence);
>>                 if (r)
>>                         goto error_cleanup;
>>         }
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h
>> index cbaa19b2b8a3..207e801c24ed 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h
>> @@ -75,6 +75,8 @@ struct amdgpu_cs_parser {
>>
>>         unsigned                        num_post_deps;
>>         struct amdgpu_cs_post_dep       *post_deps;
>> +
>> +       struct amdgpu_sync              sync;
>>  };
>>
>>  int amdgpu_cs_find_mapping(struct amdgpu_cs_parser *parser,
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> index ba98d65835b4..b8494c3b3b8a 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> @@ -106,7 +106,6 @@ int amdgpu_job_alloc(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>>         (*job)->base.sched = &adev->rings[0]->sched;
>>         (*job)->vm = vm;
>>
>> -       amdgpu_sync_create(&(*job)->sync);
>>         amdgpu_sync_create(&(*job)->explicit_sync);
>>         (*job)->vram_lost_counter = atomic_read(&adev->vram_lost_counter);
>>         (*job)->vm_pd_addr = AMDGPU_BO_INVALID_OFFSET;
>> @@ -174,9 +173,7 @@ static void amdgpu_job_free_cb(struct drm_sched_job *s_job)
>>
>>         drm_sched_job_cleanup(s_job);
>>
>> -       amdgpu_sync_free(&job->sync);
>>         amdgpu_sync_free(&job->explicit_sync);
>> -
>>         dma_fence_put(&job->hw_fence);
>>  }
>>
>> @@ -202,7 +199,6 @@ void amdgpu_job_free(struct amdgpu_job *job)
>>                 drm_sched_job_cleanup(&job->base);
>>
>>         amdgpu_job_free_resources(job);
>> -       amdgpu_sync_free(&job->sync);
>>         amdgpu_sync_free(&job->explicit_sync);
>>         if (job->gang_submit != &job->base.s_fence->scheduled)
>>                 dma_fence_put(job->gang_submit);
>> @@ -246,10 +242,9 @@ amdgpu_job_dependency(struct drm_sched_job *sched_job,
>>  {
>>         struct amdgpu_ring *ring = to_amdgpu_ring(s_entity->rq->sched);
>>         struct amdgpu_job *job = to_amdgpu_job(sched_job);
>> -       struct dma_fence *fence;
>> +       struct dma_fence *fence = NULL;
>>         int r;
>>
>> -       fence = amdgpu_sync_get_fence(&job->sync);
>>         while (fence == NULL && job->vm && !job->vmid) {
>>                 r = amdgpu_vmid_grab(job->vm, ring, job, &fence);
>>                 if (r)
>> @@ -273,8 +268,6 @@ static struct dma_fence *amdgpu_job_run(struct drm_sched_job *sched_job)
>>         job = to_amdgpu_job(sched_job);
>>         finished = &job->base.s_fence->finished;
>>
>> -       BUG_ON(amdgpu_sync_peek_fence(&job->sync, NULL));
>> -
>>         trace_amdgpu_sched_run_job(job);
>>
>>         /* Skip job if VRAM is lost and never resubmit gangs */
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h
>> index 9c10b9bd0084..6558839fda03 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h
>> @@ -47,7 +47,6 @@ enum amdgpu_ib_pool_type;
>>  struct amdgpu_job {
>>         struct drm_sched_job    base;
>>         struct amdgpu_vm        *vm;
>> -       struct amdgpu_sync      sync;
>>         struct amdgpu_sync      explicit_sync;
>>         struct dma_fence        hw_fence;
>>         struct dma_fence        *gang_submit;
>> --
>> 2.25.1
>>
> 
> Hi, I've been testing the Mesh shader benchmark in GravityMark and
> I've bisected my laptop freezing up and rebooting, to this commit
> 
> 1728baa7e4e60054bf13dd9b1212d133cbd53b3f is the first bad commit
> commit 1728baa7e4e60054bf13dd9b1212d133cbd53b3f
> Author: Christian König <christian.koenig@amd.com>
> Date:   Thu Sep 29 14:04:01 2022 +0200
> 
>    drm/amdgpu: use scheduler dependencies for CS
> 
>    Entirely remove the sync obj in the job.
> 
>    Signed-off-by: Christian König <christian.koenig@amd.com>
>    Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
>    Link: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.freedesktop.org%2Fpatch%2Fmsgid%2F20221014084641.128280-11-christian.koenig%40amd.com&data=05%7C01%7Cluben.tuikov%40amd.com%7C89490e3fad4843fd789308dae368e10a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638072336848708258%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=yinQfgx3pcqZjCzafxTysYlhb4RUwJN8t8cb2VjOOes%3D&reserved=0
> 
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c  | 21 ++++++++++-----------
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h  |  2 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_job.c |  9 +--------
> drivers/gpu/drm/amd/amdgpu/amdgpu_job.h |  1 -
> 4 files changed, 13 insertions(+), 20 deletions(-)
> 
> This is on a prime system 6800M with the latest mesa
> 
> I tried reverting this patch however it didn't revert cleanly, and my
> attempt doesn't work and only partially freezes up the system
> 
> Would you like me to open a bug for this on
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fdrm%2Famd%2F-%2Fissues&data=05%7C01%7Cluben.tuikov%40amd.com%7C89490e3fad4843fd789308dae368e10a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638072336848708258%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=M8d6vBXgByuQCRm9844a9jYtIDfuDy7efv3NM03Bmho%3D&reserved=0 ?
> 

Hi Mike,

Could you try this patch:

https://lore.kernel.org/all/20221219104718.21677-1-christian.koenig@amd.com/

Regards,
Luben