[Intel-xe] [PATCH 1/3] drm/xe: Introduce a module parameter to control XeLink

[David Kershner <david.kershner@intel.com>]

Add a new module parameter to control enable/disable of the XeLink
feature.

Signed-off-by: David Kershner <david.kershner@intel.com>
---
 drivers/gpu/drm/xe/Makefile    |  3 ++-
 drivers/gpu/drm/xe/xe_xelink.c | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/xe/xe_xelink.c

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 1b59702cd9f9..d46558cf12a9 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -115,7 +115,8 @@ xe-y += xe_bb.o \
 	xe_vm_madvise.o \
 	xe_wait_user_fence.o \
 	xe_wa.o \
-	xe_wopcm.o
+	xe_wopcm.o \
+	xe_xelink.o
 
 # i915 Display compat #defines and #includes
 subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
diff --git a/drivers/gpu/drm/xe/xe_xelink.c b/drivers/gpu/drm/xe/xe_xelink.c
new file mode 100644
index 000000000000..51a31f6a4740
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_xelink.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include <linux/moduleparam.h>
+
+/*
+ * This module parameter is needed because SRIOV PF and XeLink are mutually
+ * exclusive. The driver needs to be able to enable/disable the XeLink
+ * infrastructure (specifically Device Physical Addressing).  Since there
+ * will be no enable/disable for the SRIOV PF path, this parameter is
+ * needed to explicitly disable XeLink when SRIOV PF is required.
+ */
+static bool xe_enable_xelink = true;
+module_param_named(enable_xelink, xe_enable_xelink, bool, 0400);
+MODULE_PARM_DESC(enable_xelink, "Enable XeLink feature (default: true)");
-- 
2.35.1