drm/amdkfd: fix some race conditions in vram buffer alloc/free of svm code

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[ Upstream commit 7bfaa160ca ]

This patch fixes:
1: ref number of prange's svm_bo got decreased by an async call from hmm. When
wait svm_bo of prange got released we shoul also wait prang->svm_bo become NULL,
otherwise prange->svm_bo may be set to null after allocate new vram buffer.

2: During waiting svm_bo of prange got released in a while loop should reschedule
current task to give other tasks oppotunity to run, specially the the workque
task that handles svm_bo ref release, otherwise we may enter to softlock.

Signed-off-by: Xiaogang.Chen <xiaogang.chen@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Xiaogang Chen 2023-09-20 11:02:51 -05:00 • committed by Greg Kroah-Hartman

parent 78e998884d

commit 9eae81af92

1 changed files with 4 additions and 4 deletions

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

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