On Wed, 4 Sep 2024 12:19:11 +0200 Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote: > On Fri, 30 Aug 2024 10:03:50 +0200 > Mary Guillemard <mary.guillemard@xxxxxxxxxxxxx> wrote: > > > Expose timestamp information supported by the GPU with a new device > > query. > > > > Mali uses an external timer as GPU system time. On ARM, this is wired to > > the generic arch timer so we wire cntfrq_el0 as device frequency. > > > > This new uAPI will be used in Mesa to implement timestamp queries and > > VK_KHR_calibrated_timestamps. > > > > Since this extends the uAPI and because userland needs a way to advertise > > those features conditionally, this also bumps the driver minor version. > > > > v2: > > - Rewrote to use GPU timestamp register > > - Added timestamp_offset to drm_panthor_timestamp_info > > - Add missing include for arch_timer_get_cntfrq > > - Rework commit message > > > > v3: > > - Add panthor_gpu_read_64bit_counter > > - Change panthor_gpu_read_timestamp to use > > panthor_gpu_read_64bit_counter > > > > v4: > > - Fix multiple typos in uAPI documentation > > - Mention behavior when the timestamp frequency is unknown > > - Use u64 instead of unsigned long long > > for panthor_gpu_read_timestamp > > - Apply r-b from Mihail > > > > Signed-off-by: Mary Guillemard <mary.guillemard@xxxxxxxxxxxxx> > > Reviewed-by: Mihail Atanassov <mihail.atanassov@xxxxxxx> > > Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> Queued to drm-misc-next.
