drm/i915/pxp: define PXP device flag and kconfig

Ahead of the PXP implementation, define the relevant define flag and
kconfig option.

v2: flip kconfig default to N. Some machines have IFWIs that do not
support PXP, so we need it to be an opt-in until we add support to query
the caps from the mei device.

v10: change comments from "Gen12+" to "Gen12 and newer"

Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210924191452.1539378-4-alan.previn.teres.alexis@intel.com

drivers/gpu/drm/i915/Kconfig

@@ -131,6 +131,17 @@ config DRM_I915_GVT_KVMGT
 	  Choose this option if you want to enable KVMGT support for
 	  Intel GVT-g.
 
+config DRM_I915_PXP
+	bool "Enable Intel PXP support for Intel Gen12 and newer platform"
+	depends on DRM_I915
+	depends on INTEL_MEI && INTEL_MEI_PXP
+	default n
+	help
+	  PXP (Protected Xe Path) is an i915 component, available on GEN12 and
+	  newer GPUs, that helps to establish the hardware protected session and
+	  manage the status of the alive software session, as well as its life
+	  cycle.
+
 menu "drm/i915 Debugging"
 depends on DRM_I915
 depends on EXPERT

drivers/gpu/drm/i915/i915_drv.h

@@ -1700,6 +1700,9 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 
 #define HAS_GLOBAL_MOCS_REGISTERS(dev_priv)	(INTEL_INFO(dev_priv)->has_global_mocs)
 
+#define HAS_PXP(dev_priv)  ((IS_ENABLED(CONFIG_DRM_I915_PXP) && \
+			    INTEL_INFO(dev_priv)->has_pxp) && \
+			    VDBOX_MASK(&dev_priv->gt))
 
 #define HAS_GMCH(dev_priv) (INTEL_INFO(dev_priv)->display.has_gmch)
 

drivers/gpu/drm/i915/intel_device_info.h

@@ -133,6 +133,7 @@ enum intel_ppgtt_type {
 	func(has_logical_ring_elsq); \
 	func(has_mslices); \
 	func(has_pooled_eu); \
+	func(has_pxp); \
 	func(has_rc6); \
 	func(has_rc6p); \
 	func(has_rps); \