drm/amdgpu: Fix deadlock during GPU reset.
Bug: Kfifo is limited at size, during GPU reset it would fill up to limit and the pushing thread (producer) would wait for the scheduler worker to consume the items in the fifo while holding reservation lock on a BO. The gpu reset thread on the other hand blocks the scheduler during reset. Before it unblocks the sceduler it might want to recover VRAM and so will try to reserve the same BO the producer thread is already holding creating a deadlock. Fix: Switch from kfifo to SPSC queue which is unlimited in size. Signed-off-by: NAndrey Grodzovsky <Andrey.Grodzovsky@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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