drm/xe: Only use reserved BCS instances for usm migrate exec queue

The GuC context scheduling queue is 2 entires deep, thus it is possible
for a migration job to be stuck behind a fault if migration exec queue
shares engines with user jobs. This can deadlock as the migrate exec
queue is required to service page faults. Avoid deadlock by only using
reserved BCS instances for usm migrate exec queue.

Fixes: a043fbab7af5 ("drm/xe/pvc: Use fast copy engines as migrate engine on PVC")
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240415190453.696553-2-matthew.brost@intel.com
Reviewed-by: Brian Welty <brian.welty@intel.com>
(cherry picked from commit 04f4a70a183a688a60fe3882d6e4236ea02cfc67)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

diff --git a/drivers/gpu/drm/xe/xe_migrate.c b/drivers/gpu/drm/xe/xe_migrate.c
index 9f6e9b7f11c848502ebba3b819f3ff829f22304a..65e5a3f4c340f0f6bb3597f94efc099d9ff23e26 100644 (file)
--- a/drivers/gpu/drm/xe/xe_migrate.c
+++ b/drivers/gpu/drm/xe/xe_migrate.c
@@ -34,7 +34,6 @@
 #include "xe_sync.h"
 #include "xe_trace.h"
 #include "xe_vm.h"
-#include "xe_wa.h"
 
 /**
  * struct xe_migrate - migrate context.
@@ -300,10 +299,6 @@ static int xe_migrate_prepare_vm(struct xe_tile *tile, struct xe_migrate *m,
 }
 
 /*
- * Due to workaround 16017236439, odd instance hardware copy engines are
- * faster than even instance ones.
- * This function returns the mask involving all fast copy engines and the
- * reserved copy engine to be used as logical mask for migrate engine.
  * Including the reserved copy engine is required to avoid deadlocks due to
  * migrate jobs servicing the faults gets stuck behind the job that faulted.
  */
@@ -317,8 +312,7 @@ static u32 xe_migrate_usm_logical_mask(struct xe_gt *gt)
                if (hwe->class != XE_ENGINE_CLASS_COPY)
                        continue;
 
-               if (!XE_WA(gt, 16017236439) ||
-                   xe_gt_is_usm_hwe(gt, hwe) || hwe->instance & 1)
+               if (xe_gt_is_usm_hwe(gt, hwe))
                        logical_mask |= BIT(hwe->logical_instance);
        }
 
@@ -369,6 +363,10 @@ struct xe_migrate *xe_migrate_init(struct xe_tile *tile)
                if (!hwe || !logical_mask)
                        return ERR_PTR(-EINVAL);
 
+               /*
+                * XXX: Currently only reserving 1 (likely slow) BCS instance on
+                * PVC, may want to revisit if performance is needed.
+                */
                m->q = xe_exec_queue_create(xe, vm, logical_mask, 1, hwe,
                                            EXEC_QUEUE_FLAG_KERNEL |
                                            EXEC_QUEUE_FLAG_PERMANENT |