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drm/amdkfd: Fix mmap write lock not release

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If mmap write lock is taken while draining retry fault, mmap write lock
is not released because svm_range_restore_pages calls mmap_read_unlock
then returns. This causes deadlock and system hangs later because mmap
read or write lock cannot be taken.

Downgrade mmap write lock to read lock if draining retry fault fix this
bug.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2025-09-15 15:57:32 -04:00 committed by Alex Deucher
parent 58e6fc2fb9
commit 7574f30337
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
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@ -3045,6 +3045,8 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
if (svms->checkpoint_ts[gpuidx] != 0) {
if (amdgpu_ih_ts_after_or_equal(ts, svms->checkpoint_ts[gpuidx])) {
pr_debug("draining retry fault, drop fault 0x%llx\n", addr);
if (write_locked)
mmap_write_downgrade(mm);
r = -EAGAIN;
goto out_unlock_svms;
} else {