From 790bdc7cb2e7dafbac0aafc016dcb7493c925bac Mon Sep 17 00:00:00 2001
From: Matthew Brost <matthew.brost@intel.com>
Date: Fri, 9 Jun 2023 11:09:37 -0700
Subject: [PATCH] drm/xe: Handle unmapped userptr in analyze VM
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A corner exists where a userptr may have no mapping when analyze VM is
called, handle this case.

Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index ea205244fcf9c..fa4778bfd0639 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3455,9 +3455,13 @@ int xe_analyze_vm(struct drm_printer *p, struct xe_vm *vm, int gt_id)
 		if (is_userptr) {
 			struct xe_res_cursor cur;
 
-			xe_res_first_sg(vma->userptr.sg, 0, XE_PAGE_SIZE,
-					&cur);
-			addr = xe_res_dma(&cur);
+			if (vma->userptr.sg) {
+				xe_res_first_sg(vma->userptr.sg, 0, XE_PAGE_SIZE,
+						&cur);
+				addr = xe_res_dma(&cur);
+			} else {
+				addr = 0;
+			}
 		} else {
 			addr = __xe_bo_addr(vma->bo, 0, XE_PAGE_SIZE, &is_vram);
 		}
-- 
2.30.2