On 10/24/2024 5:18 PM, Nirmoy Das wrote:
> Flush xe ordered_wq in case of ufence timeout which is observed
> on LNL and that points to the recent scheduling issue with E-cores.
>
> This is similar to the recent fix:
> commit e51527233804 ("drm/xe/guc/ct: Flush g2h worker in case of g2h
> response timeout") and should be removed once there is E core
> scheduling fix.
>
> v2: Add platform check(Himal)
> s/__flush_workqueue/flush_workqueue(Jani)
>
> Cc: Badal Nilawar <badal.nilawar@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: John Harrison <John.C.Harrison@xxxxxxxxx>
> Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@xxxxxxxxx>
> Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v6.11+
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2754
> Suggested-by: Matthew Brost <matthew.brost@xxxxxxxxx>
> Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
> Reviewed-by: Matthew Brost <matthew.brost@xxxxxxxxx>
> ---
> drivers/gpu/drm/xe/xe_wait_user_fence.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/xe/xe_wait_user_fence.c b/drivers/gpu/drm/xe/xe_wait_user_fence.c
> index f5deb81eba01..78a0ad3c78fe 100644
> --- a/drivers/gpu/drm/xe/xe_wait_user_fence.c
> +++ b/drivers/gpu/drm/xe/xe_wait_user_fence.c
> @@ -13,6 +13,7 @@
> #include "xe_device.h"
> #include "xe_gt.h"
> #include "xe_macros.h"
> +#include "compat-i915-headers/i915_drv.h"
Sorry sent too soon. This is bit out of place. I will sort it and resend after sometime to accumulate reviews.
> #include "xe_exec_queue.h"
>
> static int do_compare(u64 addr, u64 value, u64 mask, u16 op)
> @@ -155,6 +156,19 @@ int xe_wait_user_fence_ioctl(struct drm_device *dev, void *data,
> }
>
> if (!timeout) {
> + if (IS_LUNARLAKE(xe)) {
> + /*
> + * This is analogous to e51527233804 ("drm/xe/guc/ct: Flush g2h
> + * worker in case of g2h response timeout")
> + *
> + * TODO: Drop this change once workqueue scheduling delay issue is
> + * fixed on LNL Hybrid CPU.
> + */
> + flush_workqueue(xe->ordered_wq);
> + err = do_compare(addr, args->value, args->mask, args->op);
> + if (err <= 0)
> + break;
> + }
> err = -ETIME;
> break;
> }
