[PATCH 7/9] drm/xe/vf: Don't use register based TLB invalidation if VF

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

VF drivers can only use GuC-based TLB invalidation, as they don't
have access to the related registers. However, VFs shouldn't need
any explicit TLB invalidation before enabling CTB communication,
as there will be an implicit GGTT TLB invalidation issued by the
GuC itself as part of MMIO-based action handling.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
index 23d397a246a8..e1f1ccb01143 100644
--- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
+++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
@@ -13,6 +13,7 @@
 #include "xe_guc.h"
 #include "xe_guc_ct.h"
 #include "xe_mmio.h"
+#include "xe_sriov.h"
 #include "xe_trace.h"
 #include "regs/xe_guc_regs.h"
 
@@ -249,6 +250,9 @@ int xe_gt_tlb_invalidation_ggtt(struct xe_gt *gt)
 
 		xe_gt_tlb_invalidation_wait(gt, seqno);
 	} else if (xe_device_uc_enabled(xe) && !xe_device_wedged(xe)) {
+		if (IS_SRIOV_VF(xe))
+			return 0;
+
 		xe_gt_WARN_ON(gt, xe_force_wake_get(gt_to_fw(gt), XE_FW_GT));
 		if (xe->info.platform == XE_PVC || GRAPHICS_VER(xe) >= 20) {
 			xe_mmio_write32(gt, PVC_GUC_TLB_INV_DESC1,
-- 
2.43.0