From: "Christian König" <christian.koenig@amd.com> To: Daniel Vetter <daniel.vetter@ffwll.ch>, DRI Development <dri-devel@lists.freedesktop.org> Cc: Jack Zhang <Jack.Zhang1@amd.com>, Intel Graphics Development <intel-gfx@lists.freedesktop.org>, Steven Price <steven.price@arm.com>, Luben Tuikov <luben.tuikov@amd.com>, Boris Brezillon <boris.brezillon@collabora.com>, Daniel Vetter <daniel.vetter@intel.com> Subject: Re: [PATCH v3 01/20] drm/sched: entity->rq selection cannot fail Date: Fri, 9 Jul 2021 08:53:13 +0200 [thread overview] Message-ID: <5588d1c3-833b-bd95-69e6-a103f2e8affa@amd.com> (raw) In-Reply-To: <20210708173754.3877540-2-daniel.vetter@ffwll.ch> Am 08.07.21 um 19:37 schrieb Daniel Vetter: > If it does, someone managed to set up a sched_entity without > schedulers, which is just a driver bug. NAK, it is perfectly valid for rq selection to fail. See drm_sched_pick_best(): if (!sched->ready) { DRM_WARN("scheduler %s is not ready, skipping", sched->name); continue; } This can happen when a device reset fails for some engine. Regards, Christian. > > We BUG_ON() here because in the next patch drm_sched_job_init() will > be split up, with drm_sched_job_arm() never failing. And that's the > part where the rq selection will end up in. > > Note that if having an empty sched_list set on an entity is indeed a > valid use-case, we can keep that check in job_init even after the split > into job_init/arm. > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > Cc: "Christian König" <christian.koenig@amd.com> > Cc: Luben Tuikov <luben.tuikov@amd.com> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch> > Cc: Steven Price <steven.price@arm.com> > Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com> > Cc: Boris Brezillon <boris.brezillon@collabora.com> > Cc: Jack Zhang <Jack.Zhang1@amd.com> > --- > drivers/gpu/drm/scheduler/sched_entity.c | 2 +- > drivers/gpu/drm/scheduler/sched_main.c | 3 +-- > 2 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c > index 79554aa4dbb1..6fc116ee7302 100644 > --- a/drivers/gpu/drm/scheduler/sched_entity.c > +++ b/drivers/gpu/drm/scheduler/sched_entity.c > @@ -45,7 +45,7 @@ > * @guilty: atomic_t set to 1 when a job on this queue > * is found to be guilty causing a timeout > * > - * Note: the sched_list should have at least one element to schedule > + * Note: the sched_list must have at least one element to schedule > * the entity > * > * Returns 0 on success or a negative error code on failure. > diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c > index 33c414d55fab..01dd47154181 100644 > --- a/drivers/gpu/drm/scheduler/sched_main.c > +++ b/drivers/gpu/drm/scheduler/sched_main.c > @@ -586,8 +586,7 @@ int drm_sched_job_init(struct drm_sched_job *job, > struct drm_gpu_scheduler *sched; > > drm_sched_entity_select_rq(entity); > - if (!entity->rq) > - return -ENOENT; > + BUG_ON(!entity->rq); > > sched = entity->rq->sched; >
WARNING: multiple messages have this Message-ID (diff)
From: "Christian König" <christian.koenig@amd.com> To: Daniel Vetter <daniel.vetter@ffwll.ch>, DRI Development <dri-devel@lists.freedesktop.org> Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com>, Jack Zhang <Jack.Zhang1@amd.com>, Intel Graphics Development <intel-gfx@lists.freedesktop.org>, Steven Price <steven.price@arm.com>, Luben Tuikov <luben.tuikov@amd.com>, Daniel Vetter <daniel.vetter@intel.com> Subject: Re: [Intel-gfx] [PATCH v3 01/20] drm/sched: entity->rq selection cannot fail Date: Fri, 9 Jul 2021 08:53:13 +0200 [thread overview] Message-ID: <5588d1c3-833b-bd95-69e6-a103f2e8affa@amd.com> (raw) In-Reply-To: <20210708173754.3877540-2-daniel.vetter@ffwll.ch> Am 08.07.21 um 19:37 schrieb Daniel Vetter: > If it does, someone managed to set up a sched_entity without > schedulers, which is just a driver bug. NAK, it is perfectly valid for rq selection to fail. See drm_sched_pick_best(): if (!sched->ready) { DRM_WARN("scheduler %s is not ready, skipping", sched->name); continue; } This can happen when a device reset fails for some engine. Regards, Christian. > > We BUG_ON() here because in the next patch drm_sched_job_init() will > be split up, with drm_sched_job_arm() never failing. And that's the > part where the rq selection will end up in. > > Note that if having an empty sched_list set on an entity is indeed a > valid use-case, we can keep that check in job_init even after the split > into job_init/arm. > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > Cc: "Christian König" <christian.koenig@amd.com> > Cc: Luben Tuikov <luben.tuikov@amd.com> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch> > Cc: Steven Price <steven.price@arm.com> > Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com> > Cc: Boris Brezillon <boris.brezillon@collabora.com> > Cc: Jack Zhang <Jack.Zhang1@amd.com> > --- > drivers/gpu/drm/scheduler/sched_entity.c | 2 +- > drivers/gpu/drm/scheduler/sched_main.c | 3 +-- > 2 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c > index 79554aa4dbb1..6fc116ee7302 100644 > --- a/drivers/gpu/drm/scheduler/sched_entity.c > +++ b/drivers/gpu/drm/scheduler/sched_entity.c > @@ -45,7 +45,7 @@ > * @guilty: atomic_t set to 1 when a job on this queue > * is found to be guilty causing a timeout > * > - * Note: the sched_list should have at least one element to schedule > + * Note: the sched_list must have at least one element to schedule > * the entity > * > * Returns 0 on success or a negative error code on failure. > diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c > index 33c414d55fab..01dd47154181 100644 > --- a/drivers/gpu/drm/scheduler/sched_main.c > +++ b/drivers/gpu/drm/scheduler/sched_main.c > @@ -586,8 +586,7 @@ int drm_sched_job_init(struct drm_sched_job *job, > struct drm_gpu_scheduler *sched; > > drm_sched_entity_select_rq(entity); > - if (!entity->rq) > - return -ENOENT; > + BUG_ON(!entity->rq); > > sched = entity->rq->sched; > _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next prev parent reply other threads:[~2021-07-09 6:53 UTC|newest] Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-08 17:37 [PATCH v3 00/20] drm/sched dependency tracking and dma-resv fixes Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 01/20] drm/sched: entity->rq selection cannot fail Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-09 6:53 ` Christian König [this message] 2021-07-09 6:53 ` Christian König 2021-07-09 7:14 ` Daniel Vetter 2021-07-09 7:14 ` [Intel-gfx] " Daniel Vetter 2021-07-09 7:23 ` Christian König 2021-07-09 7:23 ` [Intel-gfx] " Christian König 2021-07-09 8:00 ` Daniel Vetter 2021-07-09 8:00 ` [Intel-gfx] " Daniel Vetter 2021-07-09 8:11 ` Christian König 2021-07-09 8:11 ` [Intel-gfx] " Christian König 2021-07-08 17:37 ` [PATCH v3 02/20] drm/sched: Split drm_sched_job_init Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 03/20] drm/sched: Barriers are needed for entity->last_scheduled Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 18:56 ` Andrey Grodzovsky 2021-07-08 18:56 ` [Intel-gfx] " Andrey Grodzovsky 2021-07-08 19:53 ` Daniel Vetter 2021-07-08 19:53 ` [Intel-gfx] " Daniel Vetter 2021-07-08 21:54 ` [PATCH] " Daniel Vetter 2021-07-08 21:54 ` [Intel-gfx] " Daniel Vetter 2021-07-09 6:57 ` Christian König 2021-07-09 6:57 ` [Intel-gfx] " Christian König 2021-07-09 7:40 ` Daniel Vetter 2021-07-09 7:40 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 04/20] drm/sched: Add dependency tracking Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 05/20] drm/sched: drop entity parameter from drm_sched_push_job Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 06/20] drm/sched: improve docs around drm_sched_entity Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 07/20] drm/panfrost: use scheduler dependency tracking Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-12 9:19 ` Steven Price 2021-07-12 9:19 ` [Intel-gfx] " Steven Price 2021-07-12 9:19 ` Steven Price 2021-07-08 17:37 ` [PATCH v3 08/20] drm/lima: " Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 09/20] drm/v3d: Move drm_sched_job_init to v3d_job_init Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 10/20] drm/v3d: Use scheduler dependency handling Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 11/20] drm/etnaviv: " Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 12/20] drm/gem: Delete gem array fencing helpers Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 13/20] drm/sched: Don't store self-dependencies Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 14/20] drm/sched: Check locking in drm_sched_job_await_implicit Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 15/20] drm/msm: Don't break exclusive fence ordering Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 16/20] drm/msm: always wait for the exclusive fence Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-09 8:48 ` Christian König 2021-07-09 8:48 ` [Intel-gfx] " Christian König 2021-07-09 8:48 ` Christian König 2021-07-09 9:15 ` Daniel Vetter 2021-07-09 9:15 ` [Intel-gfx] " Daniel Vetter 2021-07-09 9:15 ` Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 17/20] drm/etnaviv: Don't break exclusive fence ordering Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 18/20] drm/i915: delete exclude argument from i915_sw_fence_await_reservation Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 19/20] drm/i915: Don't break exclusive fence ordering Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` [PATCH v3 20/20] dma-resv: Give the docs a do-over Daniel Vetter 2021-07-08 17:37 ` [Intel-gfx] " Daniel Vetter 2021-07-08 17:37 ` Daniel Vetter 2021-07-09 0:03 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for drm/sched dependency tracking and dma-resv fixes (rev2) Patchwork 2021-07-09 0:29 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork 2021-07-09 15:27 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
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