Jordan, any idea if more frequent frequency changes would for some reason make a630 grumpy? I was expecting it should be somewhat similar to a618 (same GMU fw, etc). The main result of that patch should be clamping to min freq when gpu goes idle, and the toggling back to devfreq provided freq on idle->active transition. So there might be more frequent freq transitions.
Caleb, I don't suppose you could somehow delay starting UI and get some traces? Something along the lines of:
localhost ~ # cd /sys/kernel/debug/tracing/ localhost /sys/kernel/debug/tracing # echo 1 > events/drm_msm_gpu/enable localhost /sys/kernel/debug/tracing # echo 1 > tracing_on localhost /sys/kernel/debug/tracing # cat trace_pipe
Does adding an 'if (1) return' at the top of msm_devfreq_idle() help? That should bypass the clamping to min freq when the GPU isn't doing anything and reduce the # of freq transitions. I suppose we could opt-in to this behavior on a per-gpu basis..
BR, -R
On Wed, Jul 28, 2021 at 5:35 PM Caleb Connolly caleb.connolly@linaro.org wrote:
Hi Rob,
This series causes a fatal crash on my Oneplus 6, the device goes to Qualcomm crashdump mode shortly after reaching UI with the following errors:
https://paste.ubuntu.com/p/HvjmzZYtgw/
I did a git bisect and the patch ("drm/msm: Devfreq tuning") seems to be the cause of the crash, reverting it resolves the issue.
On 28/07/2021 21:52, Rob Clark wrote:
Hi Dave & Daniel,
An early pull for v5.15 (there'll be more coming in a week or two), consisting of the drm/scheduler conversion and a couple other small series that one was based one. Mostly sending this now because IIUC danvet wanted it in drm-next so he could rebase on it. (Daniel, if you disagree then speak up, and I'll instead include this in the main pull request once that is ready.)
This also has a core patch to drop drm_gem_object_put_locked() now that the last use of it is removed.
The following changes since commit ff1176468d368232b684f75e82563369208bc371:
Linux 5.14-rc3 (2021-07-25 15:35:14 -0700)
are available in the Git repository at:
https://gitlab.freedesktop.org/drm/msm.git drm-msm-next-2021-07-28
for you to fetch changes up to 4541e4f2225c30b0e9442be9eb2fb8b7086cdd1f:
drm/msm/gem: Mark active before pinning (2021-07-28 09:19:00 -0700)
Rob Clark (18): drm/msm: Let fences read directly from memptrs drm/msm: Signal fences sooner drm/msm: Split out devfreq handling drm/msm: Split out get_freq() helper drm/msm: Devfreq tuning drm/msm: Docs and misc cleanup drm/msm: Small submitqueue creation cleanup drm/msm: drop drm_gem_object_put_locked() drm: Drop drm_gem_object_put_locked() drm/msm/submit: Simplify out-fence-fd handling drm/msm: Consolidate submit bo state drm/msm: Track "seqno" fences by idr drm/msm: Return ERR_PTR() from submit_create() drm/msm: Conversion to drm scheduler drm/msm: Drop submit bo_list drm/msm: Drop struct_mutex in submit path drm/msm: Utilize gpu scheduler priorities drm/msm/gem: Mark active before pinning
drivers/gpu/drm/drm_gem.c | 22 -- drivers/gpu/drm/msm/Kconfig | 1 + drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/adreno/a5xx_debugfs.c | 4 +- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 6 +- drivers/gpu/drm/msm/adreno/a5xx_power.c | 2 +- drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 7 +- drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 12 +- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +- drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 4 +- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 6 +- drivers/gpu/drm/msm/msm_drv.c | 30 ++- drivers/gpu/drm/msm/msm_fence.c | 53 +---- drivers/gpu/drm/msm/msm_fence.h | 44 +++- drivers/gpu/drm/msm/msm_gem.c | 94 +------- drivers/gpu/drm/msm/msm_gem.h | 47 ++-- drivers/gpu/drm/msm/msm_gem_submit.c | 344 +++++++++++++++++----------- drivers/gpu/drm/msm/msm_gpu.c | 220 ++++-------------- drivers/gpu/drm/msm/msm_gpu.h | 139 ++++++++++- drivers/gpu/drm/msm/msm_gpu_devfreq.c | 203 ++++++++++++++++ drivers/gpu/drm/msm/msm_rd.c | 6 +- drivers/gpu/drm/msm/msm_ringbuffer.c | 69 +++++- drivers/gpu/drm/msm/msm_ringbuffer.h | 12 + drivers/gpu/drm/msm/msm_submitqueue.c | 53 +++-- include/drm/drm_gem.h | 2 - include/uapi/drm/msm_drm.h | 14 +- 26 files changed, 865 insertions(+), 536 deletions(-) create mode 100644 drivers/gpu/drm/msm/msm_gpu_devfreq.c
-- Kind Regards, Caleb (they/them)