drm/xe: Set PTE_DM bit for stolen on MTL

Integrated graphics 1270 and beyond should set the PTE_LM bit in the PTE
when it's stolen memory. Add a new function, xe_bo_is_stolen_devmem(),
and use it when encoding the PTE.

In some places in the spec the PTE bit is called "Local Memory",
abbreviated as LM, and in others it's called "Device Memory" (DM). Since
we moved away from "Local Memory" and preferred the "vram" terminology,
also rename the macros as DM to follow the name of the new function.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230726160708.3967790-7-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index d4e60a96ed64..65b56e7a2fde 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -80,6 +80,21 @@ bool xe_bo_is_stolen(struct xe_bo *bo)
 	return bo->ttm.resource->mem_type == XE_PL_STOLEN;
 }
 
+/**
+ * xe_bo_is_stolen_devmem - check if BO is of stolen type accessed via PCI BAR
+ * @bo: The BO
+ *
+ * The stolen memory is accessed through the PCI BAR for both DGFX and some
+ * integrated platforms that have a dedicated bit in the PTE for devmem (DM).
+ *
+ * Returns: true if it's stolen memory accessed via PCI BAR, false otherwise.
+ */
+bool xe_bo_is_stolen_devmem(struct xe_bo *bo)
+{
+	return xe_bo_is_stolen(bo) &&
+		GRAPHICS_VERx100(xe_bo_device(bo)) >= 1270;
+}
+
 static bool xe_bo_is_user(struct xe_bo *bo)
 {
 	return bo->flags & XE_BO_CREATE_USER_BIT;