| Message ID | 20241211080500.2349505-1-boris.brezillon@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] drm/panthor: Report innocent group kill | expand |
On Wed, 11 Dec 2024 09:05:00 +0100 Boris Brezillon <boris.brezillon@collabora.com> wrote: > Groups can be killed during a reset even though they did nothing wrong. > That usually happens when the FW is put in a bad state by other groups, > resulting in group suspension failures when the reset happens. > > If we end up in that situation, flag the group innocent and report > innocence through a new DRM_PANTHOR_GROUP_STATE flag. > > Bump the minor driver version to reflect the uAPI change. > > Changes in v4: > - Add an entry to the driver version changelog > - Add R-bs > > Changes in v3: > - Actually report innocence to userspace > > Changes in v2: > - New patch > > Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> > Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> > Reviewed-by: Steven Price <steven.price@arm.com> Queued to drm-misc-next. > --- > drivers/gpu/drm/panthor/panthor_drv.c | 3 ++- > drivers/gpu/drm/panthor/panthor_sched.c | 18 ++++++++++++++++++ > include/uapi/drm/panthor_drm.h | 9 +++++++++ > 3 files changed, 29 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c > index ac7e53f6e3f0..1498c97b4b85 100644 > --- a/drivers/gpu/drm/panthor/panthor_drv.c > +++ b/drivers/gpu/drm/panthor/panthor_drv.c > @@ -1493,6 +1493,7 @@ static void panthor_debugfs_init(struct drm_minor *minor) > * - 1.1 - adds DEV_QUERY_TIMESTAMP_INFO query > * - 1.2 - adds DEV_QUERY_GROUP_PRIORITIES_INFO query > * - adds PANTHOR_GROUP_PRIORITY_REALTIME priority > + * - 1.3 - adds DRM_PANTHOR_GROUP_STATE_INNOCENT flag > */ > static const struct drm_driver panthor_drm_driver = { > .driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ | > @@ -1507,7 +1508,7 @@ static const struct drm_driver panthor_drm_driver = { > .desc = "Panthor DRM driver", > .date = "20230801", > .major = 1, > - .minor = 2, > + .minor = 3, > > .gem_create_object = panthor_gem_create_object, > .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, > diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c > index ef4bec7ff9c7..97ed5fe5a191 100644 > --- a/drivers/gpu/drm/panthor/panthor_sched.c > +++ b/drivers/gpu/drm/panthor/panthor_sched.c > @@ -610,6 +610,16 @@ struct panthor_group { > */ > bool timedout; > > + /** > + * @innocent: True when the group becomes unusable because the group suspension > + * failed during a reset. > + * > + * Sometimes the FW was put in a bad state by other groups, causing the group > + * suspension happening in the reset path to fail. In that case, we consider the > + * group innocent. > + */ > + bool innocent; > + > /** > * @syncobjs: Pool of per-queue synchronization objects. > * > @@ -2690,6 +2700,12 @@ void panthor_sched_suspend(struct panthor_device *ptdev) > u32 csg_id = ffs(slot_mask) - 1; > struct panthor_csg_slot *csg_slot = &sched->csg_slots[csg_id]; > > + /* If the group was still usable before that point, we consider > + * it innocent. > + */ > + if (group_can_run(csg_slot->group)) > + csg_slot->group->innocent = true; > + > /* We consider group suspension failures as fatal and flag the > * group as unusable by setting timedout=true. > */ > @@ -3570,6 +3586,8 @@ int panthor_group_get_state(struct panthor_file *pfile, > get_state->state |= DRM_PANTHOR_GROUP_STATE_FATAL_FAULT; > get_state->fatal_queues = group->fatal_queues; > } > + if (group->innocent) > + get_state->state |= DRM_PANTHOR_GROUP_STATE_INNOCENT; > mutex_unlock(&sched->lock); > > group_put(group); > diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h > index 87c9cb555dd1..b99763cbae48 100644 > --- a/include/uapi/drm/panthor_drm.h > +++ b/include/uapi/drm/panthor_drm.h > @@ -923,6 +923,15 @@ enum drm_panthor_group_state_flags { > * When a group ends up with this flag set, no jobs can be submitted to its queues. > */ > DRM_PANTHOR_GROUP_STATE_FATAL_FAULT = 1 << 1, > + > + /** > + * @DRM_PANTHOR_GROUP_STATE_INNOCENT: Group was killed during a reset caused by other > + * groups. > + * > + * This flag can only be set if DRM_PANTHOR_GROUP_STATE_TIMEDOUT is set and > + * DRM_PANTHOR_GROUP_STATE_FATAL_FAULT is not. > + */ > + DRM_PANTHOR_GROUP_STATE_INNOCENT = 1 << 2, > }; > > /**
diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c index ac7e53f6e3f0..1498c97b4b85 100644 --- a/drivers/gpu/drm/panthor/panthor_drv.c +++ b/drivers/gpu/drm/panthor/panthor_drv.c @@ -1493,6 +1493,7 @@ static void panthor_debugfs_init(struct drm_minor *minor) * - 1.1 - adds DEV_QUERY_TIMESTAMP_INFO query * - 1.2 - adds DEV_QUERY_GROUP_PRIORITIES_INFO query * - adds PANTHOR_GROUP_PRIORITY_REALTIME priority + * - 1.3 - adds DRM_PANTHOR_GROUP_STATE_INNOCENT flag */ static const struct drm_driver panthor_drm_driver = { .driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ | @@ -1507,7 +1508,7 @@ static const struct drm_driver panthor_drm_driver = { .desc = "Panthor DRM driver", .date = "20230801", .major = 1, - .minor = 2, + .minor = 3, .gem_create_object = panthor_gem_create_object, .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c index ef4bec7ff9c7..97ed5fe5a191 100644 --- a/drivers/gpu/drm/panthor/panthor_sched.c +++ b/drivers/gpu/drm/panthor/panthor_sched.c @@ -610,6 +610,16 @@ struct panthor_group { */ bool timedout; + /** + * @innocent: True when the group becomes unusable because the group suspension + * failed during a reset. + * + * Sometimes the FW was put in a bad state by other groups, causing the group + * suspension happening in the reset path to fail. In that case, we consider the + * group innocent. + */ + bool innocent; + /** * @syncobjs: Pool of per-queue synchronization objects. * @@ -2690,6 +2700,12 @@ void panthor_sched_suspend(struct panthor_device *ptdev) u32 csg_id = ffs(slot_mask) - 1; struct panthor_csg_slot *csg_slot = &sched->csg_slots[csg_id]; + /* If the group was still usable before that point, we consider + * it innocent. + */ + if (group_can_run(csg_slot->group)) + csg_slot->group->innocent = true; + /* We consider group suspension failures as fatal and flag the * group as unusable by setting timedout=true. */ @@ -3570,6 +3586,8 @@ int panthor_group_get_state(struct panthor_file *pfile, get_state->state |= DRM_PANTHOR_GROUP_STATE_FATAL_FAULT; get_state->fatal_queues = group->fatal_queues; } + if (group->innocent) + get_state->state |= DRM_PANTHOR_GROUP_STATE_INNOCENT; mutex_unlock(&sched->lock); group_put(group); diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h index 87c9cb555dd1..b99763cbae48 100644 --- a/include/uapi/drm/panthor_drm.h +++ b/include/uapi/drm/panthor_drm.h @@ -923,6 +923,15 @@ enum drm_panthor_group_state_flags { * When a group ends up with this flag set, no jobs can be submitted to its queues. */ DRM_PANTHOR_GROUP_STATE_FATAL_FAULT = 1 << 1, + + /** + * @DRM_PANTHOR_GROUP_STATE_INNOCENT: Group was killed during a reset caused by other + * groups. + * + * This flag can only be set if DRM_PANTHOR_GROUP_STATE_TIMEDOUT is set and + * DRM_PANTHOR_GROUP_STATE_FATAL_FAULT is not. + */ + DRM_PANTHOR_GROUP_STATE_INNOCENT = 1 << 2, }; /**