[PATCH v2 1/3] drm/xe: Use ordered wq for preempt fence waiting

[Lucas De Marchi]

On Mon, Apr 01, 2024 at 03:19:11PM -0700, Matthew Brost wrote:
>Preempt fences can sleep waiting for an exec queue suspend operation to
>complete. If the system_unbound_wq is used for waiting and the number of
>waiters exceeds max_active this will result in other users of the
>system_unbound_wq getting starved. Use a device private work queue for
>preempt fences to avoid starvation of the system_unbound_wq.
>
>Even though suspend operations can complete out-of-order, all suspend
>operations within a VM need to complete before the preempt rebind worker
>can start. With that, use a device private ordered wq for preempt fence
>waiting.
>
>v2:
> - Add comment about cleanup on failure (Matt R)
> - Update commit message (Lucas)
>
>Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
>Signed-off-by: Matthew Brost <matthew.brost at intel.com>


Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>

thanks
Lucas De Marchi