drm/xe: GSC forcewake support

The ID for the GSC forcewake domain already exists, but we're missing
the register definitions and the domain intialization, so add that in.

v2: move reg definition to be in address order (Matt)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230817201831.1583172-6-daniele.ceraolospurio@intel.comSigned-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -39,6 +39,7 @@
 #define   GMD_ID_RELEASE_MASK			REG_GENMASK(21, 14)
 #define   GMD_ID_REVID				REG_GENMASK(5, 0)
 
+#define FORCEWAKE_ACK_GSC			XE_REG(0xdf8)
 #define FORCEWAKE_ACK_GT_MTL			XE_REG(0xdfc)
 
 /* L3 Cache Control */
@@ -256,6 +257,7 @@
 #define FORCEWAKE_RENDER			XE_REG(0xa278)
 #define FORCEWAKE_MEDIA_VDBOX(n)		XE_REG(0xa540 + (n) * 4)
 #define FORCEWAKE_MEDIA_VEBOX(n)		XE_REG(0xa560 + (n) * 4)
+#define FORCEWAKE_GSC				XE_REG(0xa618)
 
 #define XEHPC_LNCFMISCCFGREG0			XE_REG_MCR(0xb01c, XE_REG_OPTION_MASKED)
 #define   XEHPC_OVRLSCCC			REG_BIT(0)

drivers/gpu/drm/xe/xe_force_wake.c

@@ -97,6 +97,13 @@ void xe_force_wake_init_engines(struct xe_gt *gt, struct xe_force_wake *fw)
 			    FORCEWAKE_ACK_MEDIA_VEBOX(j),
 			    BIT(0), BIT(16));
 	}
+
+	if (gt->info.engine_mask & BIT(XE_HW_ENGINE_GSCCS0))
+		domain_init(&fw->domains[XE_FW_DOMAIN_ID_GSC],
+			    XE_FW_DOMAIN_ID_GSC,
+			    FORCEWAKE_GSC,
+			    FORCEWAKE_ACK_GSC,
+			    BIT(0), BIT(16));
 }
 
 static void domain_wake(struct xe_gt *gt, struct xe_force_wake_domain *domain)