On Fri, Jan 15, 2021 at 4:31 PM Veera Sundaram Sankaran <veeras@xxxxxxxxxxxxxx> wrote: > > Some drivers have hardware capability to get the precise HW timestamp > of certain events based on which the fences are triggered. The delta > between the event HW timestamp & current HW reference timestamp can > be used to calculate the timestamp in kernel's CLOCK_MONOTONIC time > domain. This allows it to set accurate timestamp factoring out any > software and IRQ latencies. Add a timestamp variant of fence signal > function, dma_fence_signal_timestamp to allow drivers to update the > precise timestamp for fences. > > Changes in v2: > - Add a new fence signal variant instead of modifying fence struct > > Changes in v3: > - Add timestamp domain information to commit-text and > dma_fence_signal_timestamp documentation > > Signed-off-by: Veera Sundaram Sankaran <veeras@xxxxxxxxxxxxxx> > --- > drivers/dma-buf/dma-fence.c | 70 ++++++++++++++++++++++++++++++++++++++++----- > include/linux/dma-fence.h | 3 ++ > 2 files changed, 66 insertions(+), 7 deletions(-) Thanks for respinning this! Reviewed-by: John Stultz <john.stultz@xxxxxxxxxx> -john
