drm/amdgpu: Fix kfd device lock during partition

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The compute partition switch locked the kfd device, freed it during the
pre-switch teardown, and then unlocked at the end - by which point
adev->kfd.dev referenced the newly reinitialized device, so the unlock
landed on the wrong object and the per-device lock was never balanced.

Add a dedicated prepare function to unwind and clean up kfd device.
Don't use the global lock during teardown. A new device is created after
partition switch; hence there is no need to do 'unlock' on a different
object after the switch.

User is not supposed to run any process on the device during partition
switch. Keep acquire/release semantics for init_complete so that the
device remains unavailable for a process till its reinitialization is
complete.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Mukul Joshi <mukul.joshi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Lijo Lazar 2026-09-08 15:46:08 +05:30 • committed by Alex Deucher

parent 15b2b06744

commit 09b336c575

7 changed files with 45 additions and 24 deletions

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19

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

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6

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

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6

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

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11

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

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11

drivers/gpu/drm/amd/amdgpu/soc_v1_0.c

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10

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

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6

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

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