[PATCH] drm/xe/tests: Make cross-device dma-buf BOs CPU-visible on small BAR

[Marcin Bernatowicz]

Small-BAR systems (e.g., SR-IOV VFs in VMs) expose only a subset of
VRAM via PCI/BAR. Exporting a BO outside that window fails, and the
selftests also do CPU fill/verify.

Set XE_BO_FLAG_NEEDS_CPU_ACCESS for cross-device variants to force
CPU-mappable placement and keep tests reliable. Large-BAR/P2P setups
are unaffected.

Suggested-by: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
---
 drivers/gpu/drm/xe/tests/xe_dma_buf.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/tests/xe_dma_buf.c b/drivers/gpu/drm/xe/tests/xe_dma_buf.c
index c53f67ce4b0a..4c3b16835c93 100644
--- a/drivers/gpu/drm/xe/tests/xe_dma_buf.c
+++ b/drivers/gpu/drm/xe/tests/xe_dma_buf.c
@@ -206,7 +206,7 @@ static const struct dma_buf_attach_ops nop2p_attach_ops = {
 static const struct dma_buf_test_params test_params[] = {
 	{.mem_mask = XE_BO_FLAG_VRAM0,
 	 .attach_ops = &xe_dma_buf_attach_ops},
-	{.mem_mask = XE_BO_FLAG_VRAM0,
+	{.mem_mask = XE_BO_FLAG_VRAM0 | XE_BO_FLAG_NEEDS_CPU_ACCESS,
 	 .attach_ops = &xe_dma_buf_attach_ops,
 	 .force_different_devices = true},
 
@@ -238,7 +238,8 @@ static const struct dma_buf_test_params test_params[] = {
 
 	{.mem_mask = XE_BO_FLAG_SYSTEM | XE_BO_FLAG_VRAM0,
 	 .attach_ops = &xe_dma_buf_attach_ops},
-	{.mem_mask = XE_BO_FLAG_SYSTEM | XE_BO_FLAG_VRAM0,
+	{.mem_mask = XE_BO_FLAG_SYSTEM | XE_BO_FLAG_VRAM0 |
+		     XE_BO_FLAG_NEEDS_CPU_ACCESS,
 	 .attach_ops = &xe_dma_buf_attach_ops,
 	 .force_different_devices = true},
 
-- 
2.31.1