[PATCH] drm/xe: Validate preferred system memory placement in xe_svm_range_validate

[Matthew Brost <matthew.brost@intel.com>]

Ensure preferred system memory placement is checked in
xe_svm_range_validate when dpagemap is NULL. Without this check, a
prefetch to system memory may become a no-op because device memory is
considered a valid placement.

Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Fixes: 238dbc9d9f4a ("drm/xe: Use the vma attibute drm_pagemap to select where to migrate")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_svm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 05dba6abbcc8..be55b53ace8c 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -988,6 +988,8 @@ bool xe_svm_range_validate(struct xe_vm *vm,
 	ret = (range->tile_present & ~range->tile_invalidated & tile_mask) == tile_mask;
 	if (dpagemap)
 		ret = ret && xe_svm_range_has_pagemap_locked(range, dpagemap);
+	else
+		ret = ret && !range->base.pages.dpagemap;
 
 	xe_svm_notifier_unlock(vm);
 
-- 
2.34.1