drm/i915/mtl: Add MTL forcewake support

MTL has separate forcewake tables for the primary/render GT and the
media GT; each GT's intel_uncore will use a separate forcewake table and
should only initialize the domains that are relevant to that GT.  The GT
ack register also moves to a new location of (GSI base + 0xDFC) on this
platform.

Note that although our uncore handlers take care of transparently
redirecting all register accesses in the media GT's GSI range to their
new offset at 0x380000, the forcewake ranges listed in the table should
use the final, post-translation offsets.

NOTE:  There are two ranges in the media IP that have multicast
registers where the two register instances reside in different power
wells (either VD0 or VD2).  We don't have an easy way to deal with this
today (and in fact we don't even access these register ranges in the
driver today), so for now we just mark those ranges as FORCEWAKE_ALL
which will cause all of the media power wells to be grabbed, ensuring
proper operation.  If we start reading/writing in those ranges in the
future, we can re-visit whether it's worth adding extra steering
complexity into our forcewake support.

Bspec: 67788, 67789, 52077
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Harish Chegondi <harish.chegondi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220910001631.1986601-1-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -39,6 +39,9 @@
 #define FORCEWAKE_ACK_RENDER_GEN9		_MMIO(0xd84)
 #define FORCEWAKE_ACK_MEDIA_GEN9		_MMIO(0xd88)
 
+#define FORCEWAKE_ACK_GSC			_MMIO(0xdf8)
+#define FORCEWAKE_ACK_GT_MTL			_MMIO(0xdfc)
+
 #define MCFG_MCR_SELECTOR			_MMIO(0xfd0)
 #define SF_MCR_SELECTOR				_MMIO(0xfd8)
 #define GEN8_MCR_SELECTOR			_MMIO(0xfdc)
@@ -898,6 +901,8 @@
 #define FORCEWAKE_MEDIA_VDBOX_GEN11(n)		_MMIO(0xa540 + (n) * 4)
 #define FORCEWAKE_MEDIA_VEBOX_GEN11(n)		_MMIO(0xa560 + (n) * 4)
 
+#define FORCEWAKE_REQ_GSC			_MMIO(0xa618)
+
 #define CHV_POWER_SS0_SIG1			_MMIO(0xa720)
 #define CHV_POWER_SS0_SIG2			_MMIO(0xa724)
 #define CHV_POWER_SS1_SIG1			_MMIO(0xa728)

drivers/gpu/drm/i915/intel_uncore.h

@@ -62,6 +62,7 @@ enum forcewake_domain_id {
 	FW_DOMAIN_ID_MEDIA_VEBOX1,
 	FW_DOMAIN_ID_MEDIA_VEBOX2,
 	FW_DOMAIN_ID_MEDIA_VEBOX3,
+	FW_DOMAIN_ID_GSC,
 
 	FW_DOMAIN_ID_COUNT
 };
@@ -82,6 +83,7 @@ enum forcewake_domains {
 	FORCEWAKE_MEDIA_VEBOX1	= BIT(FW_DOMAIN_ID_MEDIA_VEBOX1),
 	FORCEWAKE_MEDIA_VEBOX2	= BIT(FW_DOMAIN_ID_MEDIA_VEBOX2),
 	FORCEWAKE_MEDIA_VEBOX3	= BIT(FW_DOMAIN_ID_MEDIA_VEBOX3),
+	FORCEWAKE_GSC		= BIT(FW_DOMAIN_ID_GSC),
 
 	FORCEWAKE_ALL = BIT(FW_DOMAIN_ID_COUNT) - 1,
 };

drivers/gpu/drm/i915/selftests/intel_uncore.c

@@ -70,6 +70,8 @@ static int intel_shadow_table_check(void)
 		{ gen12_shadowed_regs, ARRAY_SIZE(gen12_shadowed_regs) },
 		{ dg2_shadowed_regs, ARRAY_SIZE(dg2_shadowed_regs) },
 		{ pvc_shadowed_regs, ARRAY_SIZE(pvc_shadowed_regs) },
+		{ mtl_shadowed_regs, ARRAY_SIZE(mtl_shadowed_regs) },
+		{ xelpmp_shadowed_regs, ARRAY_SIZE(xelpmp_shadowed_regs) },
 	};
 	const struct i915_range *range;
 	unsigned int i, j;
@@ -117,6 +119,8 @@ int intel_uncore_mock_selftests(void)
 		{ __gen12_fw_ranges, ARRAY_SIZE(__gen12_fw_ranges), true },
 		{ __xehp_fw_ranges, ARRAY_SIZE(__xehp_fw_ranges), true },
 		{ __pvc_fw_ranges, ARRAY_SIZE(__pvc_fw_ranges), true },
+		{ __mtl_fw_ranges, ARRAY_SIZE(__mtl_fw_ranges), true },
+		{ __xelpmp_fw_ranges, ARRAY_SIZE(__xelpmp_fw_ranges), true },
 	};
 	int err, i;