• Felix Kuehling's avatar
    drm/amdgpu: Track pending retry faults in IH and VM (v2) · a2f14820
    Felix Kuehling authored
    IH tracks pending retry faults in a hash table for fast lookup in
    interrupt context. Each VM has a short FIFO of pending VM faults for
    processing in a bottom half.
    
    The IH prescreening stage adds retry faults and filters out repeated
    retry interrupts to minimize the impact of interrupt storms.
    
    It's the VM's responsibility remove pending faults once they are
    handled. For now this is only done when the VM is destroyed.
    
    v2:
    - Made the hash table smaller and the FIFO longer. I never want the
      FIFO to fill up, because that would make prescreen take longer.
      128 pending page faults should be enough to keep migrations busy.
    Signed-off-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
    Acked-by: Christian König <christian.koenig@amd.com> (v1)
    Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
    Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
    a2f14820
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