On Tue, Mar 28, 2023 at 03:34:02PM -0700, Rob Clark wrote: > Hi Dave and Daniel, > > Here is the series for dma-fence deadline hint, without driver > specific patches, or UAPI, with the intent that it can be merged into > drm-next as well as -driver next trees to enable landing driver > specific support through their corresponding -next trees. > > The following changes since commit eeac8ede17557680855031c6f305ece2378af326: > > Linux 6.3-rc2 (2023-03-12 16:36:44 -0700) > > are available in the Git repository at: > > https://gitlab.freedesktop.org/drm/msm.git tags/dma-fence-deadline Thanks for respinnning to unblock this, merged to drm-next. I'll also do an -rc4 backmerge, so please hold for that if you backmerge yourself. > > for you to fetch changes up to d39e48ca80c0960b039cb38633957f0040f63e1a: > > drm/atomic-helper: Set fence deadline for vblank (2023-03-28 14:52:59 -0700) > > ---------------------------------------------------------------- > This series adds a deadline hint to fences, so realtime deadlines > such as vblank can be communicated to the fence signaller for power/ > frequency management decisions. > > This is partially inspired by a trick i915 does, but implemented > via dma-fence for a couple of reasons: > > 1) To continue to be able to use the atomic helpers > 2) To support cases where display and gpu are different drivers > > See https://patchwork.freedesktop.org/series/93035/ > > This does not yet add any UAPI, although this will be needed in > a number of cases: > > 1) Workloads "ping-ponging" between CPU and GPU, where we don't > want the GPU freq governor to interpret time stalled waiting > for GPU as "idle" time > 2) Cases where the compositor is waiting for fences to be signaled > before issuing the atomic ioctl, for example to maintain 60fps > cursor updates even when the GPU is not able to maintain that > framerate. > > ---------------------------------------------------------------- > Rob Clark (8): > dma-buf/dma-fence: Add deadline awareness > dma-buf/fence-array: Add fence deadline support > dma-buf/fence-chain: Add fence deadline support > dma-buf/dma-resv: Add a way to set fence deadline > dma-buf/sync_file: Surface sync-file uABI > drm/scheduler: Add fence deadline support > drm/vblank: Add helper to get next vblank time > drm/atomic-helper: Set fence deadline for vblank > > Documentation/driver-api/dma-buf.rst | 16 +++++++-- > drivers/dma-buf/dma-fence-array.c | 11 ++++++ > drivers/dma-buf/dma-fence-chain.c | 12 +++++++ > drivers/dma-buf/dma-fence.c | 59 +++++++++++++++++++++++++++++++++ > drivers/dma-buf/dma-resv.c | 22 ++++++++++++ > drivers/gpu/drm/drm_atomic_helper.c | 37 +++++++++++++++++++++ > drivers/gpu/drm/drm_vblank.c | 53 ++++++++++++++++++++++++----- > drivers/gpu/drm/scheduler/sched_fence.c | 46 +++++++++++++++++++++++++ > drivers/gpu/drm/scheduler/sched_main.c | 2 +- > include/drm/drm_vblank.h | 1 + > include/drm/gpu_scheduler.h | 17 ++++++++++ > include/linux/dma-fence.h | 22 ++++++++++++ > include/linux/dma-resv.h | 2 ++ > include/uapi/linux/sync_file.h | 37 +++++++++------------ > 14 files changed, 303 insertions(+), 34 deletions(-) -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
