drm/amdkfd: Reliably prevent reclaim-FS while holding DQM lock

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This is needed to prevent deadlocks when MMU notifiers run in
reclaim-FS context and take the DQM lock for userptr evictions.
Previously this was done by making all memory allocations under
DQM locks GFP_NOIO. This is error prone. Using
memalloc_nofs_save/restore will reliably affect all memory
allocations anywhere in the kernel while the DQM lock is held.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

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Felix Kuehling 2018-07-11 22:32:44 -04:00 • committed by Oded Gabbay

parent 0337976f40

commit efeaed4d98

2 changed files with 62 additions and 43 deletions

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85

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

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20

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

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