drm/amdgpu: fix oversubscription timer for sr-iov

Browse source

The KFD/userq software oversubscription-notify timers added to
replace GFX11 MES firmware's oversubscription_timer call
amdgpu_mes_notify_unmap_queue(), which takes mes->mutex_hidden,
the same lock add/remove_hw_queue() use. Under SR-IOV this call
can block up to 9s (vs 2.1s bare metal), so MES round-trip latency
goes up (world-switch contention) it stalls re-mapping queues
and times out KFDQMTest.AllCpQueues.

Keep the firmware timer enabled for SR-IOV VFs and skip the
software timers there; the issue this works around is bare-metal
only.

Fixes: 590e266261 ("drm/amdkfd: workaround 100% gpu usage issue for gfx11")
Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Eric Huang 2026-08-25 11:14:34 -04:00 • committed by Alex Deucher

parent 5fd3b60d9b

commit 887a3ca213

3 changed files with 24 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c

View file

9

drivers/gpu/drm/amd/amdgpu/mes_v11_0.c

View file

11

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

View file