drm/xe/pf: Enable SR-IOV PF mode by default

We already claim official support for SR-IOV PF/VF modes on PTL
and BMG platforms, but by default we start the Xe driver on those
platforms in non-virtualized mode (native) since we still have
max_vfs modparam set to disable creation of the VFs.

It's time to let the Xe driver support SR-IOV PF mode by default.
We were already testing this on our CI, which was relying on the
patch that was enabling it for CONFIG_DRM_XE_DEBUG used by our CI.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250722182618.30811-3-michal.wajdeczko@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit a2b461b)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Author: mwajdecz

drivers/gpu/drm/xe/xe_module.c

@@ -27,13 +27,18 @@
 #define DEFAULT_PROBE_DISPLAY		true
 #define DEFAULT_VRAM_BAR_SIZE		0
 #define DEFAULT_FORCE_PROBE		CONFIG_DRM_XE_FORCE_PROBE
+#define DEFAULT_MAX_VFS			~0
+#define DEFAULT_MAX_VFS_STR		"unlimited"
 #define DEFAULT_WEDGED_MODE		1
 #define DEFAULT_SVM_NOTIFIER_SIZE	512
 
 struct xe_modparam xe_modparam = {
 	.probe_display =	DEFAULT_PROBE_DISPLAY,
 	.guc_log_level =	DEFAULT_GUC_LOG_LEVEL,
 	.force_probe =		DEFAULT_FORCE_PROBE,
+#ifdef CONFIG_PCI_IOV
+	.max_vfs =		DEFAULT_MAX_VFS,
+#endif
 	.wedged_mode =		DEFAULT_WEDGED_MODE,
 	.svm_notifier_size =	DEFAULT_SVM_NOTIFIER_SIZE,
 	/* the rest are 0 by default */
@@ -79,7 +84,8 @@ MODULE_PARM_DESC(force_probe,
 module_param_named(max_vfs, xe_modparam.max_vfs, uint, 0400);
 MODULE_PARM_DESC(max_vfs,
 		 "Limit number of Virtual Functions (VFs) that could be managed. "
-		 "(0 = no VFs [default]; N = allow up to N VFs)");
+		 "(0=no VFs; N=allow up to N VFs "
+		 "[default=" DEFAULT_MAX_VFS_STR "])");
 #endif
 
 module_param_named_unsafe(wedged_mode, xe_modparam.wedged_mode, int, 0600);