2024y-10m-08d-16h-28m-48s UTC: drm-tip rerere cache update

git version 2.46.2

2 files changed, 1594 insertions, 0 deletions

diff --git a/rr-cache/5d940fb2eb5fc22b4dd8cfd9fb6b06575bb02d1e/postimage b/rr-cache/5d940fb2eb5fc22b4dd8cfd9fb6b06575bb02d1e/postimage
new file mode 100644
index 000000000000..e21eb6c0fc20
--- /dev/null
+++ b/rr-cache/5d940fb2eb5fc22b4dd8cfd9fb6b06575bb02d1e/postimage
@@ -0,0 +1,795 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "xe_gt_mcr.h"
+
+#include "regs/xe_gt_regs.h"
+#include "xe_assert.h"
+#include "xe_gt.h"
+#include "xe_gt_printk.h"
+#include "xe_gt_topology.h"
+#include "xe_gt_types.h"
+#include "xe_guc_hwconfig.h"
+#include "xe_mmio.h"
+#include "xe_sriov.h"
+
+/**
+ * DOC: GT Multicast/Replicated (MCR) Register Support
+ *
+ * Some GT registers are designed as "multicast" or "replicated" registers:
+ * multiple instances of the same register share a single MMIO offset.  MCR
+ * registers are generally used when the hardware needs to potentially track
+ * independent values of a register per hardware unit (e.g., per-subslice,
+ * per-L3bank, etc.).  The specific types of replication that exist vary
+ * per-platform.
+ *
+ * MMIO accesses to MCR registers are controlled according to the settings
+ * programmed in the platform's MCR_SELECTOR register(s).  MMIO writes to MCR
+ * registers can be done in either multicast (a single write updates all
+ * instances of the register to the same value) or unicast (a write updates only
+ * one specific instance) form.  Reads of MCR registers always operate in a
+ * unicast manner regardless of how the multicast/unicast bit is set in
+ * MCR_SELECTOR.  Selection of a specific MCR instance for unicast operations is
+ * referred to as "steering."
+ *
+ * If MCR register operations are steered toward a hardware unit that is
+ * fused off or currently powered down due to power gating, the MMIO operation
+ * is "terminated" by the hardware.  Terminated read operations will return a
+ * value of zero and terminated unicast write operations will be silently
+ * ignored. During device initialization, the goal of the various
+ * ``init_steering_*()`` functions is to apply the platform-specific rules for
+ * each MCR register type to identify a steering target that will select a
+ * non-terminated instance.
+ *
+ * MCR registers are not available on Virtual Function (VF).
+ */
+
+#define STEER_SEMAPHORE		XE_REG(0xFD0)
+
+static inline struct xe_reg to_xe_reg(struct xe_reg_mcr reg_mcr)
+{
+	return reg_mcr.__reg;
+}
+
+enum {
+	MCR_OP_READ,
+	MCR_OP_WRITE
+};
+
+static const struct xe_mmio_range xelp_l3bank_steering_table[] = {
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+static const struct xe_mmio_range xehp_l3bank_steering_table[] = {
+	{ 0x008C80, 0x008CFF },
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+/*
+ * Although the bspec lists more "MSLICE" ranges than shown here, some of those
+ * are of a "GAM" subclass that has special rules and doesn't need to be
+ * included here.
+ */
+static const struct xe_mmio_range xehp_mslice_steering_table[] = {
+	{ 0x00DD00, 0x00DDFF },
+	{ 0x00E900, 0x00FFFF }, /* 0xEA00 - OxEFFF is unused */
+	{},
+};
+
+static const struct xe_mmio_range xehp_lncf_steering_table[] = {
+	{ 0x00B000, 0x00B0FF },
+	{ 0x00D880, 0x00D8FF },
+	{},
+};
+
+/*
+ * We have several types of MCR registers where steering to (0,0) will always
+ * provide us with a non-terminated value.  We'll stick them all in the same
+ * table for simplicity.
+ */
+static const struct xe_mmio_range xehpc_instance0_steering_table[] = {
+	{ 0x004000, 0x004AFF },		/* HALF-BSLICE */
+	{ 0x008800, 0x00887F },		/* CC */
+	{ 0x008A80, 0x008AFF },		/* TILEPSMI */
+	{ 0x00B000, 0x00B0FF },		/* HALF-BSLICE */
+	{ 0x00B100, 0x00B3FF },		/* L3BANK */
+	{ 0x00C800, 0x00CFFF },		/* HALF-BSLICE */
+	{ 0x00D800, 0x00D8FF },		/* HALF-BSLICE */
+	{ 0x00DD00, 0x00DDFF },		/* BSLICE */
+	{ 0x00E900, 0x00E9FF },		/* HALF-BSLICE */
+	{ 0x00EC00, 0x00EEFF },		/* HALF-BSLICE */
+	{ 0x00F000, 0x00FFFF },		/* HALF-BSLICE */
+	{ 0x024180, 0x0241FF },		/* HALF-BSLICE */
+	{},
+};
+
+static const struct xe_mmio_range xelpg_instance0_steering_table[] = {
+	{ 0x000B00, 0x000BFF },         /* SQIDI */
+	{ 0x001000, 0x001FFF },         /* SQIDI */
+	{ 0x004000, 0x0048FF },         /* GAM */
+	{ 0x008700, 0x0087FF },         /* SQIDI */
+	{ 0x00B000, 0x00B0FF },         /* NODE */
+	{ 0x00C800, 0x00CFFF },         /* GAM */
+	{ 0x00D880, 0x00D8FF },         /* NODE */
+	{ 0x00DD00, 0x00DDFF },         /* OAAL2 */
+	{},
+};
+
+static const struct xe_mmio_range xelpg_l3bank_steering_table[] = {
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+static const struct xe_mmio_range xelp_dss_steering_table[] = {
+	{ 0x008150, 0x00815F },
+	{ 0x009520, 0x00955F },
+	{ 0x00DE80, 0x00E8FF },
+	{ 0x024A00, 0x024A7F },
+	{},
+};
+
+/* DSS steering is used for GSLICE ranges as well */
+static const struct xe_mmio_range xehp_dss_steering_table[] = {
+	{ 0x005200, 0x0052FF },		/* GSLICE */
+	{ 0x005400, 0x007FFF },		/* GSLICE */
+	{ 0x008140, 0x00815F },		/* GSLICE (0x8140-0x814F), DSS (0x8150-0x815F) */
+	{ 0x008D00, 0x008DFF },		/* DSS */
+	{ 0x0094D0, 0x00955F },		/* GSLICE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },		/* DSS */
+	{ 0x00D800, 0x00D87F },		/* GSLICE */
+	{ 0x00DC00, 0x00DCFF },		/* GSLICE */
+	{ 0x00DE80, 0x00E8FF },		/* DSS (0xE000-0xE0FF reserved ) */
+	{ 0x017000, 0x017FFF },		/* GSLICE */
+	{ 0x024A00, 0x024A7F },		/* DSS */
+	{},
+};
+
+/* DSS steering is used for COMPUTE ranges as well */
+static const struct xe_mmio_range xehpc_dss_steering_table[] = {
+	{ 0x008140, 0x00817F },		/* COMPUTE (0x8140-0x814F & 0x8160-0x817F), DSS (0x8150-0x815F) */
+	{ 0x0094D0, 0x00955F },		/* COMPUTE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },		/* DSS */
+	{ 0x00DC00, 0x00DCFF },		/* COMPUTE */
+	{ 0x00DE80, 0x00E7FF },		/* DSS (0xDF00-0xE1FF reserved ) */
+	{},
+};
+
+/* DSS steering is used for SLICE ranges as well */
+static const struct xe_mmio_range xelpg_dss_steering_table[] = {
+	{ 0x005200, 0x0052FF },		/* SLICE */
+	{ 0x005500, 0x007FFF },		/* SLICE */
+	{ 0x008140, 0x00815F },		/* SLICE (0x8140-0x814F), DSS (0x8150-0x815F) */
+	{ 0x0094D0, 0x00955F },		/* SLICE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },		/* DSS */
+	{ 0x00D800, 0x00D87F },		/* SLICE */
+	{ 0x00DC00, 0x00DCFF },		/* SLICE */
+	{ 0x00DE80, 0x00E8FF },		/* DSS (0xE000-0xE0FF reserved) */
+	{},
+};
+
+static const struct xe_mmio_range xelpmp_oaddrm_steering_table[] = {
+	{ 0x393200, 0x39323F },
+	{ 0x393400, 0x3934FF },
+	{},
+};
+
+static const struct xe_mmio_range dg2_implicit_steering_table[] = {
+	{ 0x000B00, 0x000BFF },		/* SF (SQIDI replication) */
+	{ 0x001000, 0x001FFF },		/* SF (SQIDI replication) */
+	{ 0x004000, 0x004AFF },		/* GAM (MSLICE replication) */
+	{ 0x008700, 0x0087FF },		/* MCFG (SQIDI replication) */
+	{ 0x00C800, 0x00CFFF },		/* GAM (MSLICE replication) */
+	{ 0x00F000, 0x00FFFF },		/* GAM (MSLICE replication) */
+	{},
+};
+
+static const struct xe_mmio_range xe2lpg_dss_steering_table[] = {
+	{ 0x005200, 0x0052FF },         /* SLICE */
+	{ 0x005500, 0x007FFF },         /* SLICE */
+	{ 0x008140, 0x00815F },         /* SLICE (0x8140-0x814F), DSS (0x8150-0x815F) */
+	{ 0x0094D0, 0x00955F },         /* SLICE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },         /* DSS */
+	{ 0x00D800, 0x00D87F },         /* SLICE */
+	{ 0x00DC00, 0x00DCFF },         /* SLICE */
+	{ 0x00DE80, 0x00E8FF },         /* DSS (0xE000-0xE0FF reserved) */
+	{ 0x00E980, 0x00E9FF },         /* SLICE */
+	{ 0x013000, 0x0133FF },         /* DSS (0x13000-0x131FF), SLICE (0x13200-0x133FF) */
+	{},
+};
+
+static const struct xe_mmio_range xe2lpg_sqidi_psmi_steering_table[] = {
+	{ 0x000B00, 0x000BFF },
+	{ 0x001000, 0x001FFF },
+	{},
+};
+
+static const struct xe_mmio_range xe2lpg_instance0_steering_table[] = {
+	{ 0x004000, 0x004AFF },         /* GAM, rsvd, GAMWKR */
+	{ 0x008700, 0x00887F },         /* SQIDI, MEMPIPE */
+	{ 0x00B000, 0x00B3FF },         /* NODE, L3BANK */
+	{ 0x00C800, 0x00CFFF },         /* GAM */
+	{ 0x00D880, 0x00D8FF },         /* NODE */
+	{ 0x00DD00, 0x00DDFF },         /* MEMPIPE */
+	{ 0x00E900, 0x00E97F },         /* MEMPIPE */
+	{ 0x00F000, 0x00FFFF },         /* GAM, GAMWKR */
+	{ 0x013400, 0x0135FF },         /* MEMPIPE */
+	{},
+};
+
+static const struct xe_mmio_range xe2lpm_gpmxmt_steering_table[] = {
+	{ 0x388160, 0x38817F },
+	{ 0x389480, 0x3894CF },
+	{},
+};
+
+static const struct xe_mmio_range xe2lpm_instance0_steering_table[] = {
+	{ 0x384000, 0x3847DF },         /* GAM, rsvd, GAM */
+	{ 0x384900, 0x384AFF },         /* GAM */
+	{ 0x389560, 0x3895FF },         /* MEDIAINF */
+	{ 0x38B600, 0x38B8FF },         /* L3BANK */
+	{ 0x38C800, 0x38D07F },         /* GAM, MEDIAINF */
+	{ 0x38F000, 0x38F0FF },         /* GAM */
+	{ 0x393C00, 0x393C7F },         /* MEDIAINF */
+	{},
+};
+
+static const struct xe_mmio_range xe3lpm_instance0_steering_table[] = {
+	{ 0x384000, 0x3847DF },         /* GAM, rsvd, GAM */
+	{ 0x384900, 0x384AFF },         /* GAM */
+	{ 0x389560, 0x3895FF },         /* MEDIAINF */
+	{ 0x38B600, 0x38B8FF },         /* L3BANK */
+	{ 0x38C800, 0x38D07F },         /* GAM, MEDIAINF */
+	{ 0x38D0D0, 0x38F0FF },		/* MEDIAINF, GAM */
+	{ 0x393C00, 0x393C7F },         /* MEDIAINF */
+	{},
+};
+
+static void init_steering_l3bank(struct xe_gt *gt)
+{
+	struct xe_mmio *mmio = &gt->mmio;
+
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270) {
+		u32 mslice_mask = REG_FIELD_GET(MEML3_EN_MASK,
+						xe_mmio_read32(mmio, MIRROR_FUSE3));
+		u32 bank_mask = REG_FIELD_GET(GT_L3_EXC_MASK,
+					      xe_mmio_read32(mmio, XEHP_FUSE4));
+
+		/*
+		 * Group selects mslice, instance selects bank within mslice.
+		 * Bank 0 is always valid _except_ when the bank mask is 010b.
+		 */
+		gt->steering[L3BANK].group_target = __ffs(mslice_mask);
+		gt->steering[L3BANK].instance_target =
+			bank_mask & BIT(0) ? 0 : 2;
+	} else if (gt_to_xe(gt)->info.platform == XE_DG2) {
+		u32 mslice_mask = REG_FIELD_GET(MEML3_EN_MASK,
+						xe_mmio_read32(mmio, MIRROR_FUSE3));
+		u32 bank = __ffs(mslice_mask) * 8;
+
+		/*
+		 * Like mslice registers, look for a valid mslice and steer to
+		 * the first L3BANK of that quad. Access to the Nth L3 bank is
+		 * split between the first bits of group and instance
+		 */
+		gt->steering[L3BANK].group_target = (bank >> 2) & 0x7;
+		gt->steering[L3BANK].instance_target = bank & 0x3;
+	} else {
+		u32 fuse = REG_FIELD_GET(L3BANK_MASK,
+					 ~xe_mmio_read32(mmio, MIRROR_FUSE3));
+
+		gt->steering[L3BANK].group_target = 0;	/* unused */
+		gt->steering[L3BANK].instance_target = __ffs(fuse);
+	}
+}
+
+static void init_steering_mslice(struct xe_gt *gt)
+{
+	u32 mask = REG_FIELD_GET(MEML3_EN_MASK,
+				 xe_mmio_read32(&gt->mmio, MIRROR_FUSE3));
+
+	/*
+	 * mslice registers are valid (not terminated) if either the meml3
+	 * associated with the mslice is present, or at least one DSS associated
+	 * with the mslice is present.  There will always be at least one meml3
+	 * so we can just use that to find a non-terminated mslice and ignore
+	 * the DSS fusing.
+	 */
+	gt->steering[MSLICE].group_target = __ffs(mask);
+	gt->steering[MSLICE].instance_target = 0;	/* unused */
+
+	/*
+	 * LNCF termination is also based on mslice presence, so we'll set
+	 * it up here.  Either LNCF within a non-terminated mslice will work,
+	 * so we just always pick LNCF 0 here.
+	 */
+	gt->steering[LNCF].group_target = __ffs(mask) << 1;
+	gt->steering[LNCF].instance_target = 0;		/* unused */
+}
+
+static unsigned int dss_per_group(struct xe_gt *gt)
+{
+	struct xe_guc *guc = &gt->uc.guc;
+	u32 max_slices = 0, max_subslices = 0;
+	int ret;
+
+	/*
+	 * Try to query the GuC's hwconfig table for the maximum number of
+	 * slices and subslices.  These don't reflect the platform's actual
+	 * slice/DSS counts, just the physical layout by which we should
+	 * determine the steering targets.  On older platforms with older GuC
+	 * firmware releases it's possible that these attributes may not be
+	 * included in the table, so we can always fall back to the old
+	 * hardcoded layouts.
+	 */
+#define HWCONFIG_ATTR_MAX_SLICES	1
+#define HWCONFIG_ATTR_MAX_SUBSLICES	70
+
+	ret = xe_guc_hwconfig_lookup_u32(guc, HWCONFIG_ATTR_MAX_SLICES,
+					 &max_slices);
+	if (ret < 0 || max_slices == 0)
+		goto fallback;
+
+	ret = xe_guc_hwconfig_lookup_u32(guc, HWCONFIG_ATTR_MAX_SUBSLICES,
+					 &max_subslices);
+	if (ret < 0 || max_subslices == 0)
+		goto fallback;
+
+	return DIV_ROUND_UP(max_subslices, max_slices);
+
+fallback:
+	xe_gt_dbg(gt, "GuC hwconfig cannot provide dss/slice; using typical fallback values\n");
+	if (gt_to_xe(gt)->info.platform == XE_PVC)
+		return 8;
+	else if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1250)
+		return 4;
+	else
+		return 6;
+}
+
+/**
+ * xe_gt_mcr_get_dss_steering - Get the group/instance steering for a DSS
+ * @gt: GT structure
+ * @dss: DSS ID to obtain steering for
+ * @group: pointer to storage for steering group ID
+ * @instance: pointer to storage for steering instance ID
+ */
+void xe_gt_mcr_get_dss_steering(struct xe_gt *gt, unsigned int dss, u16 *group, u16 *instance)
+{
+	xe_gt_assert(gt, dss < XE_MAX_DSS_FUSE_BITS);
+
+	*group = dss / gt->steering_dss_per_grp;
+	*instance = dss % gt->steering_dss_per_grp;
+}
+
+static void init_steering_dss(struct xe_gt *gt)
+{
+	gt->steering_dss_per_grp = dss_per_group(gt);
+
+	xe_gt_mcr_get_dss_steering(gt,
+				   min(xe_dss_mask_group_ffs(gt->fuse_topo.g_dss_mask, 0, 0),
+				       xe_dss_mask_group_ffs(gt->fuse_topo.c_dss_mask, 0, 0)),
+				   &gt->steering[DSS].group_target,
+				   &gt->steering[DSS].instance_target);
+}
+
+static void init_steering_oaddrm(struct xe_gt *gt)
+{
+	/*
+	 * First instance is only terminated if the entire first media slice
+	 * is absent (i.e., no VCS0 or VECS0).
+	 */
+	if (gt->info.engine_mask & (XE_HW_ENGINE_VCS0 | XE_HW_ENGINE_VECS0))
+		gt->steering[OADDRM].group_target = 0;
+	else
+		gt->steering[OADDRM].group_target = 1;
+
+	gt->steering[OADDRM].instance_target = 0;	/* unused */
+}
+
+static void init_steering_sqidi_psmi(struct xe_gt *gt)
+{
+	u32 mask = REG_FIELD_GET(XE2_NODE_ENABLE_MASK,
+				 xe_mmio_read32(&gt->mmio, MIRROR_FUSE3));
+	u32 select = __ffs(mask);
+
+	gt->steering[SQIDI_PSMI].group_target = select >> 1;
+	gt->steering[SQIDI_PSMI].instance_target = select & 0x1;
+}
+
+static void init_steering_inst0(struct xe_gt *gt)
+{
+	gt->steering[INSTANCE0].group_target = 0;	/* unused */
+	gt->steering[INSTANCE0].instance_target = 0;	/* unused */
+}
+
+static const struct {
+	const char *name;
+	void (*init)(struct xe_gt *gt);
+} xe_steering_types[] = {
+	[L3BANK] =	{ "L3BANK",	init_steering_l3bank },
+	[MSLICE] =	{ "MSLICE",	init_steering_mslice },
+	[LNCF] =	{ "LNCF",	NULL }, /* initialized by mslice init */
+	[DSS] =		{ "DSS",	init_steering_dss },
+	[OADDRM] =	{ "OADDRM / GPMXMT", init_steering_oaddrm },
+	[SQIDI_PSMI] =  { "SQIDI_PSMI", init_steering_sqidi_psmi },
+	[INSTANCE0] =	{ "INSTANCE 0",	init_steering_inst0 },
+	[IMPLICIT_STEERING] = { "IMPLICIT", NULL },
+};
+
+/**
+ * xe_gt_mcr_init_early - Early initialization of the MCR support
+ * @gt: GT structure
+ *
+ * Perform early software only initialization of the MCR lock to allow
+ * the synchronization on accessing the STEER_SEMAPHORE register and
+ * use the xe_gt_mcr_multicast_write() function.
+ */
+void xe_gt_mcr_init_early(struct xe_gt *gt)
+{
+	BUILD_BUG_ON(IMPLICIT_STEERING + 1 != NUM_STEERING_TYPES);
+	BUILD_BUG_ON(ARRAY_SIZE(xe_steering_types) != NUM_STEERING_TYPES);
+
+	spin_lock_init(&gt->mcr_lock);
+}
+
+/**
+ * xe_gt_mcr_init - Normal initialization of the MCR support
+ * @gt: GT structure
+ *
+ * Perform normal initialization of the MCR for all usages.
+ */
+void xe_gt_mcr_init(struct xe_gt *gt)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+
+	if (IS_SRIOV_VF(xe))
+		return;
+
+	if (gt->info.type == XE_GT_TYPE_MEDIA) {
+		drm_WARN_ON(&xe->drm, MEDIA_VER(xe) < 13);
+
+		if (MEDIA_VER(xe) >= 30) {
+			gt->steering[OADDRM].ranges = xe2lpm_gpmxmt_steering_table;
+			gt->steering[INSTANCE0].ranges = xe3lpm_instance0_steering_table;
+		} else if (MEDIA_VERx100(xe) >= 1301) {
+			gt->steering[OADDRM].ranges = xe2lpm_gpmxmt_steering_table;
+			gt->steering[INSTANCE0].ranges = xe2lpm_instance0_steering_table;
+		} else {
+			gt->steering[OADDRM].ranges = xelpmp_oaddrm_steering_table;
+		}
+	} else {
+		if (GRAPHICS_VER(xe) >= 20) {
+			gt->steering[DSS].ranges = xe2lpg_dss_steering_table;
+			gt->steering[SQIDI_PSMI].ranges = xe2lpg_sqidi_psmi_steering_table;
+			gt->steering[INSTANCE0].ranges = xe2lpg_instance0_steering_table;
+		} else if (GRAPHICS_VERx100(xe) >= 1270) {
+			gt->steering[INSTANCE0].ranges = xelpg_instance0_steering_table;
+			gt->steering[L3BANK].ranges = xelpg_l3bank_steering_table;
+			gt->steering[DSS].ranges = xelpg_dss_steering_table;
+		} else if (xe->info.platform == XE_PVC) {
+			gt->steering[INSTANCE0].ranges = xehpc_instance0_steering_table;
+			gt->steering[DSS].ranges = xehpc_dss_steering_table;
+		} else if (xe->info.platform == XE_DG2) {
+			gt->steering[L3BANK].ranges = xehp_l3bank_steering_table;
+			gt->steering[MSLICE].ranges = xehp_mslice_steering_table;
+			gt->steering[LNCF].ranges = xehp_lncf_steering_table;
+			gt->steering[DSS].ranges = xehp_dss_steering_table;
+			gt->steering[IMPLICIT_STEERING].ranges = dg2_implicit_steering_table;
+		} else {
+			gt->steering[L3BANK].ranges = xelp_l3bank_steering_table;
+			gt->steering[DSS].ranges = xelp_dss_steering_table;
+		}
+	}
+
+	/* Select non-terminated steering target for each type */
+	for (int i = 0; i < NUM_STEERING_TYPES; i++)
+		if (gt->steering[i].ranges && xe_steering_types[i].init)
+			xe_steering_types[i].init(gt);
+}
+
+/**
+ * xe_gt_mcr_set_implicit_defaults - Initialize steer control registers
+ * @gt: GT structure
+ *
+ * Some register ranges don't need to have their steering control registers
+ * changed on each access - it's sufficient to set them once on initialization.
+ * This function sets those registers for each platform *
+ */
+void xe_gt_mcr_set_implicit_defaults(struct xe_gt *gt)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+
+	if (IS_SRIOV_VF(xe))
+		return;
+
+	if (xe->info.platform == XE_DG2) {
+		u32 steer_val = REG_FIELD_PREP(MCR_SLICE_MASK, 0) |
+			REG_FIELD_PREP(MCR_SUBSLICE_MASK, 2);
+
+		xe_mmio_write32(&gt->mmio, MCFG_MCR_SELECTOR, steer_val);
+		xe_mmio_write32(&gt->mmio, SF_MCR_SELECTOR, steer_val);
+		/*
+		 * For GAM registers, all reads should be directed to instance 1
+		 * (unicast reads against other instances are not allowed),
+		 * and instance 1 is already the hardware's default steering
+		 * target, which we never change
+		 */
+	}
+}
+
+/*
+ * xe_gt_mcr_get_nonterminated_steering - find group/instance values that
+ *    will steer a register to a non-terminated instance
+ * @gt: GT structure
+ * @reg: register for which the steering is required
+ * @group: return variable for group steering
+ * @instance: return variable for instance steering
+ *
+ * This function returns a group/instance pair that is guaranteed to work for
+ * read steering of the given register. Note that a value will be returned even
+ * if the register is not replicated and therefore does not actually require
+ * steering.
+ *
+ * Returns true if the caller should steer to the @group/@instance values
+ * returned.  Returns false if the caller need not perform any steering
+ */
+static bool xe_gt_mcr_get_nonterminated_steering(struct xe_gt *gt,
+						 struct xe_reg_mcr reg_mcr,
+						 u8 *group, u8 *instance)
+{
+	const struct xe_reg reg = to_xe_reg(reg_mcr);
+	const struct xe_mmio_range *implicit_ranges;
+
+	for (int type = 0; type < IMPLICIT_STEERING; type++) {
+		if (!gt->steering[type].ranges)
+			continue;
+
+		for (int i = 0; gt->steering[type].ranges[i].end > 0; i++) {
+			if (xe_mmio_in_range(&gt->mmio, &gt->steering[type].ranges[i], reg)) {
+				*group = gt->steering[type].group_target;
+				*instance = gt->steering[type].instance_target;
+				return true;
+			}
+		}
+	}
+
+	implicit_ranges = gt->steering[IMPLICIT_STEERING].ranges;
+	if (implicit_ranges)
+		for (int i = 0; implicit_ranges[i].end > 0; i++)
+			if (xe_mmio_in_range(&gt->mmio, &implicit_ranges[i], reg))
+				return false;
+
+	/*
+	 * Not found in a steering table and not a register with implicit
+	 * steering. Just steer to 0/0 as a guess and raise a warning.
+	 */
+	drm_WARN(&gt_to_xe(gt)->drm, true,
+		 "Did not find MCR register %#x in any MCR steering table\n",
+		 reg.addr);
+	*group = 0;
+	*instance = 0;
+
+	return true;
+}
+
+/*
+ * Obtain exclusive access to MCR steering.  On MTL and beyond we also need
+ * to synchronize with external clients (e.g., firmware), so a semaphore
+ * register will also need to be taken.
+ */
+static void mcr_lock(struct xe_gt *gt) __acquires(&gt->mcr_lock)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+	int ret = 0;
+
+	spin_lock(&gt->mcr_lock);
+
+	/*
+	 * Starting with MTL we also need to grab a semaphore register
+	 * to synchronize with external agents (e.g., firmware) that now
+	 * shares the same steering control register. The semaphore is obtained
+	 * when a read to the relevant register returns 1.
+	 */
+	if (GRAPHICS_VERx100(xe) >= 1270)
+		ret = xe_mmio_wait32(&gt->mmio, STEER_SEMAPHORE, 0x1, 0x1, 10, NULL,
+				     true);
+
+	drm_WARN_ON_ONCE(&xe->drm, ret == -ETIMEDOUT);
+}
+
+static void mcr_unlock(struct xe_gt *gt) __releases(&gt->mcr_lock)
+{
+	/* Release hardware semaphore - this is done by writing 1 to the register */
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270)
+		xe_mmio_write32(&gt->mmio, STEER_SEMAPHORE, 0x1);
+
+	spin_unlock(&gt->mcr_lock);
+}
+
+/*
+ * Access a register with specific MCR steering
+ *
+ * Caller needs to make sure the relevant forcewake wells are up.
+ */
+static u32 rw_with_mcr_steering(struct xe_gt *gt, struct xe_reg_mcr reg_mcr,
+				u8 rw_flag, int group, int instance, u32 value)
+{
+	const struct xe_reg reg = to_xe_reg(reg_mcr);
+	struct xe_mmio *mmio = &gt->mmio;
+	struct xe_reg steer_reg;
+	u32 steer_val, val = 0;
+
+	lockdep_assert_held(&gt->mcr_lock);
+
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270) {
+		steer_reg = MTL_MCR_SELECTOR;
+		steer_val = REG_FIELD_PREP(MTL_MCR_GROUPID, group) |
+			REG_FIELD_PREP(MTL_MCR_INSTANCEID, instance);
+	} else {
+		steer_reg = MCR_SELECTOR;
+		steer_val = REG_FIELD_PREP(MCR_SLICE_MASK, group) |
+			REG_FIELD_PREP(MCR_SUBSLICE_MASK, instance);
+	}
+
+	/*
+	 * Always leave the hardware in multicast mode when doing reads and only
+	 * change it to unicast mode when doing writes of a specific instance.
+	 *
+	 * The setting of the multicast/unicast bit usually wouldn't matter for
+	 * read operations (which always return the value from a single register
+	 * instance regardless of how that bit is set), but some platforms may
+	 * have workarounds requiring us to remain in multicast mode for reads,
+	 * e.g. Wa_22013088509 on PVC.  There's no real downside to this, so
+	 * we'll just go ahead and do so on all platforms; we'll only clear the
+	 * multicast bit from the mask when explicitly doing a write operation.
+	 *
+	 * No need to save old steering reg value.
+	 */
+	if (rw_flag == MCR_OP_READ)
+		steer_val |= MCR_MULTICAST;
+
+	xe_mmio_write32(mmio, steer_reg, steer_val);
+
+	if (rw_flag == MCR_OP_READ)
+		val = xe_mmio_read32(mmio, reg);
+	else
+		xe_mmio_write32(mmio, reg, value);
+
+	/*
+	 * If we turned off the multicast bit (during a write) we're required
+	 * to turn it back on before finishing.  The group and instance values
+	 * don't matter since they'll be re-programmed on the next MCR
+	 * operation.
+	 */
+	if (rw_flag == MCR_OP_WRITE)
+		xe_mmio_write32(mmio, steer_reg, MCR_MULTICAST);
+
+	return val;
+}
+
+/**
+ * xe_gt_mcr_unicast_read_any - reads a non-terminated instance of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: register to read
+ *
+ * Reads a GT MCR register.  The read will be steered to a non-terminated
+ * instance (i.e., one that isn't fused off or powered down by power gating).
+ * This function assumes the caller is already holding any necessary forcewake
+ * domains.
+ *
+ * Returns the value from a non-terminated instance of @reg.
+ */
+u32 xe_gt_mcr_unicast_read_any(struct xe_gt *gt, struct xe_reg_mcr reg_mcr)
+{
+	const struct xe_reg reg = to_xe_reg(reg_mcr);
+	u8 group, instance;
+	u32 val;
+	bool steer;
+
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	steer = xe_gt_mcr_get_nonterminated_steering(gt, reg_mcr,
+						     &group, &instance);
+
+	if (steer) {
+		mcr_lock(gt);
+		val = rw_with_mcr_steering(gt, reg_mcr, MCR_OP_READ,
+					   group, instance, 0);
+		mcr_unlock(gt);
+	} else {
+		val = xe_mmio_read32(&gt->mmio, reg);
+	}
+
+	return val;
+}
+
+/**
+ * xe_gt_mcr_unicast_read - read a specific instance of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: the MCR register to read
+ * @group: the MCR group
+ * @instance: the MCR instance
+ *
+ * Returns the value read from an MCR register after steering toward a specific
+ * group/instance.
+ */
+u32 xe_gt_mcr_unicast_read(struct xe_gt *gt,
+			   struct xe_reg_mcr reg_mcr,
+			   int group, int instance)
+{
+	u32 val;
+
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	mcr_lock(gt);
+	val = rw_with_mcr_steering(gt, reg_mcr, MCR_OP_READ, group, instance, 0);
+	mcr_unlock(gt);
+
+	return val;
+}
+
+/**
+ * xe_gt_mcr_unicast_write - write a specific instance of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: the MCR register to write
+ * @value: value to write
+ * @group: the MCR group
+ * @instance: the MCR instance
+ *
+ * Write an MCR register in unicast mode after steering toward a specific
+ * group/instance.
+ */
+void xe_gt_mcr_unicast_write(struct xe_gt *gt, struct xe_reg_mcr reg_mcr,
+			     u32 value, int group, int instance)
+{
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	mcr_lock(gt);
+	rw_with_mcr_steering(gt, reg_mcr, MCR_OP_WRITE, group, instance, value);
+	mcr_unlock(gt);
+}
+
+/**
+ * xe_gt_mcr_multicast_write - write a value to all instances of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: the MCR register to write
+ * @value: value to write
+ *
+ * Write an MCR register in multicast mode to update all instances.
+ */
+void xe_gt_mcr_multicast_write(struct xe_gt *gt, struct xe_reg_mcr reg_mcr,
+			       u32 value)
+{
+	struct xe_reg reg = to_xe_reg(reg_mcr);
+
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	/*
+	 * Synchronize with any unicast operations.  Once we have exclusive
+	 * access, the MULTICAST bit should already be set, so there's no need
+	 * to touch the steering register.
+	 */
+	mcr_lock(gt);
+	xe_mmio_write32(&gt->mmio, reg, value);
+	mcr_unlock(gt);
+}
+
+void xe_gt_mcr_steering_dump(struct xe_gt *gt, struct drm_printer *p)
+{
+	for (int i = 0; i < NUM_STEERING_TYPES; i++) {
+		if (gt->steering[i].ranges) {
+			drm_printf(p, "%s steering: group=%#x, instance=%#x\n",
+				   xe_steering_types[i].name,
+				   gt->steering[i].group_target,
+				   gt->steering[i].instance_target);
+			for (int j = 0; gt->steering[i].ranges[j].end; j++)
+				drm_printf(p, "\t0x%06x - 0x%06x\n",
+					   gt->steering[i].ranges[j].start,
+					   gt->steering[i].ranges[j].end);
+		}
+	}
+}
diff --git a/rr-cache/5d940fb2eb5fc22b4dd8cfd9fb6b06575bb02d1e/preimage b/rr-cache/5d940fb2eb5fc22b4dd8cfd9fb6b06575bb02d1e/preimage
new file mode 100644
index 000000000000..b72a956296ca
--- /dev/null
+++ b/rr-cache/5d940fb2eb5fc22b4dd8cfd9fb6b06575bb02d1e/preimage
@@ -0,0 +1,799 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "xe_gt_mcr.h"
+
+#include "regs/xe_gt_regs.h"
+#include "xe_assert.h"
+#include "xe_gt.h"
+#include "xe_gt_printk.h"
+#include "xe_gt_topology.h"
+#include "xe_gt_types.h"
+#include "xe_guc_hwconfig.h"
+#include "xe_mmio.h"
+#include "xe_sriov.h"
+
+/**
+ * DOC: GT Multicast/Replicated (MCR) Register Support
+ *
+ * Some GT registers are designed as "multicast" or "replicated" registers:
+ * multiple instances of the same register share a single MMIO offset.  MCR
+ * registers are generally used when the hardware needs to potentially track
+ * independent values of a register per hardware unit (e.g., per-subslice,
+ * per-L3bank, etc.).  The specific types of replication that exist vary
+ * per-platform.
+ *
+ * MMIO accesses to MCR registers are controlled according to the settings
+ * programmed in the platform's MCR_SELECTOR register(s).  MMIO writes to MCR
+ * registers can be done in either multicast (a single write updates all
+ * instances of the register to the same value) or unicast (a write updates only
+ * one specific instance) form.  Reads of MCR registers always operate in a
+ * unicast manner regardless of how the multicast/unicast bit is set in
+ * MCR_SELECTOR.  Selection of a specific MCR instance for unicast operations is
+ * referred to as "steering."
+ *
+ * If MCR register operations are steered toward a hardware unit that is
+ * fused off or currently powered down due to power gating, the MMIO operation
+ * is "terminated" by the hardware.  Terminated read operations will return a
+ * value of zero and terminated unicast write operations will be silently
+ * ignored. During device initialization, the goal of the various
+ * ``init_steering_*()`` functions is to apply the platform-specific rules for
+ * each MCR register type to identify a steering target that will select a
+ * non-terminated instance.
+ *
+ * MCR registers are not available on Virtual Function (VF).
+ */
+
+#define STEER_SEMAPHORE		XE_REG(0xFD0)
+
+static inline struct xe_reg to_xe_reg(struct xe_reg_mcr reg_mcr)
+{
+	return reg_mcr.__reg;
+}
+
+enum {
+	MCR_OP_READ,
+	MCR_OP_WRITE
+};
+
+static const struct xe_mmio_range xelp_l3bank_steering_table[] = {
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+static const struct xe_mmio_range xehp_l3bank_steering_table[] = {
+	{ 0x008C80, 0x008CFF },
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+/*
+ * Although the bspec lists more "MSLICE" ranges than shown here, some of those
+ * are of a "GAM" subclass that has special rules and doesn't need to be
+ * included here.
+ */
+static const struct xe_mmio_range xehp_mslice_steering_table[] = {
+	{ 0x00DD00, 0x00DDFF },
+	{ 0x00E900, 0x00FFFF }, /* 0xEA00 - OxEFFF is unused */
+	{},
+};
+
+static const struct xe_mmio_range xehp_lncf_steering_table[] = {
+	{ 0x00B000, 0x00B0FF },
+	{ 0x00D880, 0x00D8FF },
+	{},
+};
+
+/*
+ * We have several types of MCR registers where steering to (0,0) will always
+ * provide us with a non-terminated value.  We'll stick them all in the same
+ * table for simplicity.
+ */
+static const struct xe_mmio_range xehpc_instance0_steering_table[] = {
+	{ 0x004000, 0x004AFF },		/* HALF-BSLICE */
+	{ 0x008800, 0x00887F },		/* CC */
+	{ 0x008A80, 0x008AFF },		/* TILEPSMI */
+	{ 0x00B000, 0x00B0FF },		/* HALF-BSLICE */
+	{ 0x00B100, 0x00B3FF },		/* L3BANK */
+	{ 0x00C800, 0x00CFFF },		/* HALF-BSLICE */
+	{ 0x00D800, 0x00D8FF },		/* HALF-BSLICE */
+	{ 0x00DD00, 0x00DDFF },		/* BSLICE */
+	{ 0x00E900, 0x00E9FF },		/* HALF-BSLICE */
+	{ 0x00EC00, 0x00EEFF },		/* HALF-BSLICE */
+	{ 0x00F000, 0x00FFFF },		/* HALF-BSLICE */
+	{ 0x024180, 0x0241FF },		/* HALF-BSLICE */
+	{},
+};
+
+static const struct xe_mmio_range xelpg_instance0_steering_table[] = {
+	{ 0x000B00, 0x000BFF },         /* SQIDI */
+	{ 0x001000, 0x001FFF },         /* SQIDI */
+	{ 0x004000, 0x0048FF },         /* GAM */
+	{ 0x008700, 0x0087FF },         /* SQIDI */
+	{ 0x00B000, 0x00B0FF },         /* NODE */
+	{ 0x00C800, 0x00CFFF },         /* GAM */
+	{ 0x00D880, 0x00D8FF },         /* NODE */
+	{ 0x00DD00, 0x00DDFF },         /* OAAL2 */
+	{},
+};
+
+static const struct xe_mmio_range xelpg_l3bank_steering_table[] = {
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+static const struct xe_mmio_range xelp_dss_steering_table[] = {
+	{ 0x008150, 0x00815F },
+	{ 0x009520, 0x00955F },
+	{ 0x00DE80, 0x00E8FF },
+	{ 0x024A00, 0x024A7F },
+	{},
+};
+
+/* DSS steering is used for GSLICE ranges as well */
+static const struct xe_mmio_range xehp_dss_steering_table[] = {
+	{ 0x005200, 0x0052FF },		/* GSLICE */
+	{ 0x005400, 0x007FFF },		/* GSLICE */
+	{ 0x008140, 0x00815F },		/* GSLICE (0x8140-0x814F), DSS (0x8150-0x815F) */
+	{ 0x008D00, 0x008DFF },		/* DSS */
+	{ 0x0094D0, 0x00955F },		/* GSLICE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },		/* DSS */
+	{ 0x00D800, 0x00D87F },		/* GSLICE */
+	{ 0x00DC00, 0x00DCFF },		/* GSLICE */
+	{ 0x00DE80, 0x00E8FF },		/* DSS (0xE000-0xE0FF reserved ) */
+	{ 0x017000, 0x017FFF },		/* GSLICE */
+	{ 0x024A00, 0x024A7F },		/* DSS */
+	{},
+};
+
+/* DSS steering is used for COMPUTE ranges as well */
+static const struct xe_mmio_range xehpc_dss_steering_table[] = {
+	{ 0x008140, 0x00817F },		/* COMPUTE (0x8140-0x814F & 0x8160-0x817F), DSS (0x8150-0x815F) */
+	{ 0x0094D0, 0x00955F },		/* COMPUTE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },		/* DSS */
+	{ 0x00DC00, 0x00DCFF },		/* COMPUTE */
+	{ 0x00DE80, 0x00E7FF },		/* DSS (0xDF00-0xE1FF reserved ) */
+	{},
+};
+
+/* DSS steering is used for SLICE ranges as well */
+static const struct xe_mmio_range xelpg_dss_steering_table[] = {
+	{ 0x005200, 0x0052FF },		/* SLICE */
+	{ 0x005500, 0x007FFF },		/* SLICE */
+	{ 0x008140, 0x00815F },		/* SLICE (0x8140-0x814F), DSS (0x8150-0x815F) */
+	{ 0x0094D0, 0x00955F },		/* SLICE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },		/* DSS */
+	{ 0x00D800, 0x00D87F },		/* SLICE */
+	{ 0x00DC00, 0x00DCFF },		/* SLICE */
+	{ 0x00DE80, 0x00E8FF },		/* DSS (0xE000-0xE0FF reserved) */
+	{},
+};
+
+static const struct xe_mmio_range xelpmp_oaddrm_steering_table[] = {
+	{ 0x393200, 0x39323F },
+	{ 0x393400, 0x3934FF },
+	{},
+};
+
+static const struct xe_mmio_range dg2_implicit_steering_table[] = {
+	{ 0x000B00, 0x000BFF },		/* SF (SQIDI replication) */
+	{ 0x001000, 0x001FFF },		/* SF (SQIDI replication) */
+	{ 0x004000, 0x004AFF },		/* GAM (MSLICE replication) */
+	{ 0x008700, 0x0087FF },		/* MCFG (SQIDI replication) */
+	{ 0x00C800, 0x00CFFF },		/* GAM (MSLICE replication) */
+	{ 0x00F000, 0x00FFFF },		/* GAM (MSLICE replication) */
+	{},
+};
+
+static const struct xe_mmio_range xe2lpg_dss_steering_table[] = {
+	{ 0x005200, 0x0052FF },         /* SLICE */
+	{ 0x005500, 0x007FFF },         /* SLICE */
+	{ 0x008140, 0x00815F },         /* SLICE (0x8140-0x814F), DSS (0x8150-0x815F) */
+	{ 0x0094D0, 0x00955F },         /* SLICE (0x94D0-0x951F), DSS (0x9520-0x955F) */
+	{ 0x009680, 0x0096FF },         /* DSS */
+	{ 0x00D800, 0x00D87F },         /* SLICE */
+	{ 0x00DC00, 0x00DCFF },         /* SLICE */
+	{ 0x00DE80, 0x00E8FF },         /* DSS (0xE000-0xE0FF reserved) */
+	{ 0x00E980, 0x00E9FF },         /* SLICE */
+	{ 0x013000, 0x0133FF },         /* DSS (0x13000-0x131FF), SLICE (0x13200-0x133FF) */
+	{},
+};
+
+static const struct xe_mmio_range xe2lpg_sqidi_psmi_steering_table[] = {
+	{ 0x000B00, 0x000BFF },
+	{ 0x001000, 0x001FFF },
+	{},
+};
+
+static const struct xe_mmio_range xe2lpg_instance0_steering_table[] = {
+	{ 0x004000, 0x004AFF },         /* GAM, rsvd, GAMWKR */
+	{ 0x008700, 0x00887F },         /* SQIDI, MEMPIPE */
+	{ 0x00B000, 0x00B3FF },         /* NODE, L3BANK */
+	{ 0x00C800, 0x00CFFF },         /* GAM */
+	{ 0x00D880, 0x00D8FF },         /* NODE */
+	{ 0x00DD00, 0x00DDFF },         /* MEMPIPE */
+	{ 0x00E900, 0x00E97F },         /* MEMPIPE */
+	{ 0x00F000, 0x00FFFF },         /* GAM, GAMWKR */
+	{ 0x013400, 0x0135FF },         /* MEMPIPE */
+	{},
+};
+
+static const struct xe_mmio_range xe2lpm_gpmxmt_steering_table[] = {
+	{ 0x388160, 0x38817F },
+	{ 0x389480, 0x3894CF },
+	{},
+};
+
+static const struct xe_mmio_range xe2lpm_instance0_steering_table[] = {
+	{ 0x384000, 0x3847DF },         /* GAM, rsvd, GAM */
+	{ 0x384900, 0x384AFF },         /* GAM */
+	{ 0x389560, 0x3895FF },         /* MEDIAINF */
+	{ 0x38B600, 0x38B8FF },         /* L3BANK */
+	{ 0x38C800, 0x38D07F },         /* GAM, MEDIAINF */
+	{ 0x38F000, 0x38F0FF },         /* GAM */
+	{ 0x393C00, 0x393C7F },         /* MEDIAINF */
+	{},
+};
+
+static const struct xe_mmio_range xe3lpm_instance0_steering_table[] = {
+	{ 0x384000, 0x3847DF },         /* GAM, rsvd, GAM */
+	{ 0x384900, 0x384AFF },         /* GAM */
+	{ 0x389560, 0x3895FF },         /* MEDIAINF */
+	{ 0x38B600, 0x38B8FF },         /* L3BANK */
+	{ 0x38C800, 0x38D07F },         /* GAM, MEDIAINF */
+	{ 0x38D0D0, 0x38F0FF },		/* MEDIAINF, GAM */
+	{ 0x393C00, 0x393C7F },         /* MEDIAINF */
+	{},
+};
+
+static void init_steering_l3bank(struct xe_gt *gt)
+{
+	struct xe_mmio *mmio = &gt->mmio;
+
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270) {
+		u32 mslice_mask = REG_FIELD_GET(MEML3_EN_MASK,
+						xe_mmio_read32(mmio, MIRROR_FUSE3));
+		u32 bank_mask = REG_FIELD_GET(GT_L3_EXC_MASK,
+					      xe_mmio_read32(mmio, XEHP_FUSE4));
+
+		/*
+		 * Group selects mslice, instance selects bank within mslice.
+		 * Bank 0 is always valid _except_ when the bank mask is 010b.
+		 */
+		gt->steering[L3BANK].group_target = __ffs(mslice_mask);
+		gt->steering[L3BANK].instance_target =
+			bank_mask & BIT(0) ? 0 : 2;
+	} else if (gt_to_xe(gt)->info.platform == XE_DG2) {
+		u32 mslice_mask = REG_FIELD_GET(MEML3_EN_MASK,
+						xe_mmio_read32(mmio, MIRROR_FUSE3));
+		u32 bank = __ffs(mslice_mask) * 8;
+
+		/*
+		 * Like mslice registers, look for a valid mslice and steer to
+		 * the first L3BANK of that quad. Access to the Nth L3 bank is
+		 * split between the first bits of group and instance
+		 */
+		gt->steering[L3BANK].group_target = (bank >> 2) & 0x7;
+		gt->steering[L3BANK].instance_target = bank & 0x3;
+	} else {
+		u32 fuse = REG_FIELD_GET(L3BANK_MASK,
+					 ~xe_mmio_read32(mmio, MIRROR_FUSE3));
+
+		gt->steering[L3BANK].group_target = 0;	/* unused */
+		gt->steering[L3BANK].instance_target = __ffs(fuse);
+	}
+}
+
+static void init_steering_mslice(struct xe_gt *gt)
+{
+	u32 mask = REG_FIELD_GET(MEML3_EN_MASK,
+				 xe_mmio_read32(&gt->mmio, MIRROR_FUSE3));
+
+	/*
+	 * mslice registers are valid (not terminated) if either the meml3
+	 * associated with the mslice is present, or at least one DSS associated
+	 * with the mslice is present.  There will always be at least one meml3
+	 * so we can just use that to find a non-terminated mslice and ignore
+	 * the DSS fusing.
+	 */
+	gt->steering[MSLICE].group_target = __ffs(mask);
+	gt->steering[MSLICE].instance_target = 0;	/* unused */
+
+	/*
+	 * LNCF termination is also based on mslice presence, so we'll set
+	 * it up here.  Either LNCF within a non-terminated mslice will work,
+	 * so we just always pick LNCF 0 here.
+	 */
+	gt->steering[LNCF].group_target = __ffs(mask) << 1;
+	gt->steering[LNCF].instance_target = 0;		/* unused */
+}
+
+static unsigned int dss_per_group(struct xe_gt *gt)
+{
+	struct xe_guc *guc = &gt->uc.guc;
+	u32 max_slices = 0, max_subslices = 0;
+	int ret;
+
+	/*
+	 * Try to query the GuC's hwconfig table for the maximum number of
+	 * slices and subslices.  These don't reflect the platform's actual
+	 * slice/DSS counts, just the physical layout by which we should
+	 * determine the steering targets.  On older platforms with older GuC
+	 * firmware releases it's possible that these attributes may not be
+	 * included in the table, so we can always fall back to the old
+	 * hardcoded layouts.
+	 */
+#define HWCONFIG_ATTR_MAX_SLICES	1
+#define HWCONFIG_ATTR_MAX_SUBSLICES	70
+
+	ret = xe_guc_hwconfig_lookup_u32(guc, HWCONFIG_ATTR_MAX_SLICES,
+					 &max_slices);
+	if (ret < 0 || max_slices == 0)
+		goto fallback;
+
+	ret = xe_guc_hwconfig_lookup_u32(guc, HWCONFIG_ATTR_MAX_SUBSLICES,
+					 &max_subslices);
+	if (ret < 0 || max_subslices == 0)
+		goto fallback;
+
+	return DIV_ROUND_UP(max_subslices, max_slices);
+
+fallback:
+	xe_gt_dbg(gt, "GuC hwconfig cannot provide dss/slice; using typical fallback values\n");
+	if (gt_to_xe(gt)->info.platform == XE_PVC)
+		return 8;
+	else if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1250)
+		return 4;
+	else
+		return 6;
+}
+
+/**
+ * xe_gt_mcr_get_dss_steering - Get the group/instance steering for a DSS
+ * @gt: GT structure
+ * @dss: DSS ID to obtain steering for
+ * @group: pointer to storage for steering group ID
+ * @instance: pointer to storage for steering instance ID
+ */
+void xe_gt_mcr_get_dss_steering(struct xe_gt *gt, unsigned int dss, u16 *group, u16 *instance)
+{
+	xe_gt_assert(gt, dss < XE_MAX_DSS_FUSE_BITS);
+
+	*group = dss / gt->steering_dss_per_grp;
+	*instance = dss % gt->steering_dss_per_grp;
+}
+
+static void init_steering_dss(struct xe_gt *gt)
+{
+	gt->steering_dss_per_grp = dss_per_group(gt);
+
+	xe_gt_mcr_get_dss_steering(gt,
+				   min(xe_dss_mask_group_ffs(gt->fuse_topo.g_dss_mask, 0, 0),
+				       xe_dss_mask_group_ffs(gt->fuse_topo.c_dss_mask, 0, 0)),
+				   &gt->steering[DSS].group_target,
+				   &gt->steering[DSS].instance_target);
+}
+
+static void init_steering_oaddrm(struct xe_gt *gt)
+{
+	/*
+	 * First instance is only terminated if the entire first media slice
+	 * is absent (i.e., no VCS0 or VECS0).
+	 */
+	if (gt->info.engine_mask & (XE_HW_ENGINE_VCS0 | XE_HW_ENGINE_VECS0))
+		gt->steering[OADDRM].group_target = 0;
+	else
+		gt->steering[OADDRM].group_target = 1;
+
+	gt->steering[OADDRM].instance_target = 0;	/* unused */
+}
+
+static void init_steering_sqidi_psmi(struct xe_gt *gt)
+{
+	u32 mask = REG_FIELD_GET(XE2_NODE_ENABLE_MASK,
+				 xe_mmio_read32(&gt->mmio, MIRROR_FUSE3));
+	u32 select = __ffs(mask);
+
+	gt->steering[SQIDI_PSMI].group_target = select >> 1;
+	gt->steering[SQIDI_PSMI].instance_target = select & 0x1;
+}
+
+static void init_steering_inst0(struct xe_gt *gt)
+{
+	gt->steering[INSTANCE0].group_target = 0;	/* unused */
+	gt->steering[INSTANCE0].instance_target = 0;	/* unused */
+}
+
+static const struct {
+	const char *name;
+	void (*init)(struct xe_gt *gt);
+} xe_steering_types[] = {
+	[L3BANK] =	{ "L3BANK",	init_steering_l3bank },
+	[MSLICE] =	{ "MSLICE",	init_steering_mslice },
+	[LNCF] =	{ "LNCF",	NULL }, /* initialized by mslice init */
+	[DSS] =		{ "DSS",	init_steering_dss },
+	[OADDRM] =	{ "OADDRM / GPMXMT", init_steering_oaddrm },
+	[SQIDI_PSMI] =  { "SQIDI_PSMI", init_steering_sqidi_psmi },
+	[INSTANCE0] =	{ "INSTANCE 0",	init_steering_inst0 },
+	[IMPLICIT_STEERING] = { "IMPLICIT", NULL },
+};
+
+/**
+ * xe_gt_mcr_init_early - Early initialization of the MCR support
+ * @gt: GT structure
+ *
+ * Perform early software only initialization of the MCR lock to allow
+ * the synchronization on accessing the STEER_SEMAPHORE register and
+ * use the xe_gt_mcr_multicast_write() function.
+ */
+void xe_gt_mcr_init_early(struct xe_gt *gt)
+{
+	BUILD_BUG_ON(IMPLICIT_STEERING + 1 != NUM_STEERING_TYPES);
+	BUILD_BUG_ON(ARRAY_SIZE(xe_steering_types) != NUM_STEERING_TYPES);
+
+	spin_lock_init(&gt->mcr_lock);
+}
+
+/**
+ * xe_gt_mcr_init - Normal initialization of the MCR support
+ * @gt: GT structure
+ *
+ * Perform normal initialization of the MCR for all usages.
+ */
+void xe_gt_mcr_init(struct xe_gt *gt)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+
+	if (IS_SRIOV_VF(xe))
+		return;
+
+	if (gt->info.type == XE_GT_TYPE_MEDIA) {
+		drm_WARN_ON(&xe->drm, MEDIA_VER(xe) < 13);
+
+<<<<<<<
+		if (MEDIA_VER(xe) >= 30) {
+			gt->steering[OADDRM].ranges = xe2lpm_gpmxmt_steering_table;
+			gt->steering[INSTANCE0].ranges = xe3lpm_instance0_steering_table;
+		} else if (MEDIA_VERx100(xe) >= 1301) {
+=======
+		if (MEDIA_VERx100(xe) >= 1301) {
+>>>>>>>
+			gt->steering[OADDRM].ranges = xe2lpm_gpmxmt_steering_table;
+			gt->steering[INSTANCE0].ranges = xe2lpm_instance0_steering_table;
+		} else {
+			gt->steering[OADDRM].ranges = xelpmp_oaddrm_steering_table;
+		}
+	} else {
+		if (GRAPHICS_VER(xe) >= 20) {
+			gt->steering[DSS].ranges = xe2lpg_dss_steering_table;
+			gt->steering[SQIDI_PSMI].ranges = xe2lpg_sqidi_psmi_steering_table;
+			gt->steering[INSTANCE0].ranges = xe2lpg_instance0_steering_table;
+		} else if (GRAPHICS_VERx100(xe) >= 1270) {
+			gt->steering[INSTANCE0].ranges = xelpg_instance0_steering_table;
+			gt->steering[L3BANK].ranges = xelpg_l3bank_steering_table;
+			gt->steering[DSS].ranges = xelpg_dss_steering_table;
+		} else if (xe->info.platform == XE_PVC) {
+			gt->steering[INSTANCE0].ranges = xehpc_instance0_steering_table;
+			gt->steering[DSS].ranges = xehpc_dss_steering_table;
+		} else if (xe->info.platform == XE_DG2) {
+			gt->steering[L3BANK].ranges = xehp_l3bank_steering_table;
+			gt->steering[MSLICE].ranges = xehp_mslice_steering_table;
+			gt->steering[LNCF].ranges = xehp_lncf_steering_table;
+			gt->steering[DSS].ranges = xehp_dss_steering_table;
+			gt->steering[IMPLICIT_STEERING].ranges = dg2_implicit_steering_table;
+		} else {
+			gt->steering[L3BANK].ranges = xelp_l3bank_steering_table;
+			gt->steering[DSS].ranges = xelp_dss_steering_table;
+		}
+	}
+
+	/* Select non-terminated steering target for each type */
+	for (int i = 0; i < NUM_STEERING_TYPES; i++)
+		if (gt->steering[i].ranges && xe_steering_types[i].init)
+			xe_steering_types[i].init(gt);
+}
+
+/**
+ * xe_gt_mcr_set_implicit_defaults - Initialize steer control registers
+ * @gt: GT structure
+ *
+ * Some register ranges don't need to have their steering control registers
+ * changed on each access - it's sufficient to set them once on initialization.
+ * This function sets those registers for each platform *
+ */
+void xe_gt_mcr_set_implicit_defaults(struct xe_gt *gt)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+
+	if (IS_SRIOV_VF(xe))
+		return;
+
+	if (xe->info.platform == XE_DG2) {
+		u32 steer_val = REG_FIELD_PREP(MCR_SLICE_MASK, 0) |
+			REG_FIELD_PREP(MCR_SUBSLICE_MASK, 2);
+
+		xe_mmio_write32(&gt->mmio, MCFG_MCR_SELECTOR, steer_val);
+		xe_mmio_write32(&gt->mmio, SF_MCR_SELECTOR, steer_val);
+		/*
+		 * For GAM registers, all reads should be directed to instance 1
+		 * (unicast reads against other instances are not allowed),
+		 * and instance 1 is already the hardware's default steering
+		 * target, which we never change
+		 */
+	}
+}
+
+/*
+ * xe_gt_mcr_get_nonterminated_steering - find group/instance values that
+ *    will steer a register to a non-terminated instance
+ * @gt: GT structure
+ * @reg: register for which the steering is required
+ * @group: return variable for group steering
+ * @instance: return variable for instance steering
+ *
+ * This function returns a group/instance pair that is guaranteed to work for
+ * read steering of the given register. Note that a value will be returned even
+ * if the register is not replicated and therefore does not actually require
+ * steering.
+ *
+ * Returns true if the caller should steer to the @group/@instance values
+ * returned.  Returns false if the caller need not perform any steering
+ */
+static bool xe_gt_mcr_get_nonterminated_steering(struct xe_gt *gt,
+						 struct xe_reg_mcr reg_mcr,
+						 u8 *group, u8 *instance)
+{
+	const struct xe_reg reg = to_xe_reg(reg_mcr);
+	const struct xe_mmio_range *implicit_ranges;
+
+	for (int type = 0; type < IMPLICIT_STEERING; type++) {
+		if (!gt->steering[type].ranges)
+			continue;
+
+		for (int i = 0; gt->steering[type].ranges[i].end > 0; i++) {
+			if (xe_mmio_in_range(&gt->mmio, &gt->steering[type].ranges[i], reg)) {
+				*group = gt->steering[type].group_target;
+				*instance = gt->steering[type].instance_target;
+				return true;
+			}
+		}
+	}
+
+	implicit_ranges = gt->steering[IMPLICIT_STEERING].ranges;
+	if (implicit_ranges)
+		for (int i = 0; implicit_ranges[i].end > 0; i++)
+			if (xe_mmio_in_range(&gt->mmio, &implicit_ranges[i], reg))
+				return false;
+
+	/*
+	 * Not found in a steering table and not a register with implicit
+	 * steering. Just steer to 0/0 as a guess and raise a warning.
+	 */
+	drm_WARN(&gt_to_xe(gt)->drm, true,
+		 "Did not find MCR register %#x in any MCR steering table\n",
+		 reg.addr);
+	*group = 0;
+	*instance = 0;
+
+	return true;
+}
+
+/*
+ * Obtain exclusive access to MCR steering.  On MTL and beyond we also need
+ * to synchronize with external clients (e.g., firmware), so a semaphore
+ * register will also need to be taken.
+ */
+static void mcr_lock(struct xe_gt *gt) __acquires(&gt->mcr_lock)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+	int ret = 0;
+
+	spin_lock(&gt->mcr_lock);
+
+	/*
+	 * Starting with MTL we also need to grab a semaphore register
+	 * to synchronize with external agents (e.g., firmware) that now
+	 * shares the same steering control register. The semaphore is obtained
+	 * when a read to the relevant register returns 1.
+	 */
+	if (GRAPHICS_VERx100(xe) >= 1270)
+		ret = xe_mmio_wait32(&gt->mmio, STEER_SEMAPHORE, 0x1, 0x1, 10, NULL,
+				     true);
+
+	drm_WARN_ON_ONCE(&xe->drm, ret == -ETIMEDOUT);
+}
+
+static void mcr_unlock(struct xe_gt *gt) __releases(&gt->mcr_lock)
+{
+	/* Release hardware semaphore - this is done by writing 1 to the register */
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270)
+		xe_mmio_write32(&gt->mmio, STEER_SEMAPHORE, 0x1);
+
+	spin_unlock(&gt->mcr_lock);
+}
+
+/*
+ * Access a register with specific MCR steering
+ *
+ * Caller needs to make sure the relevant forcewake wells are up.
+ */
+static u32 rw_with_mcr_steering(struct xe_gt *gt, struct xe_reg_mcr reg_mcr,
+				u8 rw_flag, int group, int instance, u32 value)
+{
+	const struct xe_reg reg = to_xe_reg(reg_mcr);
+	struct xe_mmio *mmio = &gt->mmio;
+	struct xe_reg steer_reg;
+	u32 steer_val, val = 0;
+
+	lockdep_assert_held(&gt->mcr_lock);
+
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270) {
+		steer_reg = MTL_MCR_SELECTOR;
+		steer_val = REG_FIELD_PREP(MTL_MCR_GROUPID, group) |
+			REG_FIELD_PREP(MTL_MCR_INSTANCEID, instance);
+	} else {
+		steer_reg = MCR_SELECTOR;
+		steer_val = REG_FIELD_PREP(MCR_SLICE_MASK, group) |
+			REG_FIELD_PREP(MCR_SUBSLICE_MASK, instance);
+	}
+
+	/*
+	 * Always leave the hardware in multicast mode when doing reads and only
+	 * change it to unicast mode when doing writes of a specific instance.
+	 *
+	 * The setting of the multicast/unicast bit usually wouldn't matter for
+	 * read operations (which always return the value from a single register
+	 * instance regardless of how that bit is set), but some platforms may
+	 * have workarounds requiring us to remain in multicast mode for reads,
+	 * e.g. Wa_22013088509 on PVC.  There's no real downside to this, so
+	 * we'll just go ahead and do so on all platforms; we'll only clear the
+	 * multicast bit from the mask when explicitly doing a write operation.
+	 *
+	 * No need to save old steering reg value.
+	 */
+	if (rw_flag == MCR_OP_READ)
+		steer_val |= MCR_MULTICAST;
+
+	xe_mmio_write32(mmio, steer_reg, steer_val);
+
+	if (rw_flag == MCR_OP_READ)
+		val = xe_mmio_read32(mmio, reg);
+	else
+		xe_mmio_write32(mmio, reg, value);
+
+	/*
+	 * If we turned off the multicast bit (during a write) we're required
+	 * to turn it back on before finishing.  The group and instance values
+	 * don't matter since they'll be re-programmed on the next MCR
+	 * operation.
+	 */
+	if (rw_flag == MCR_OP_WRITE)
+		xe_mmio_write32(mmio, steer_reg, MCR_MULTICAST);
+
+	return val;
+}
+
+/**
+ * xe_gt_mcr_unicast_read_any - reads a non-terminated instance of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: register to read
+ *
+ * Reads a GT MCR register.  The read will be steered to a non-terminated
+ * instance (i.e., one that isn't fused off or powered down by power gating).
+ * This function assumes the caller is already holding any necessary forcewake
+ * domains.
+ *
+ * Returns the value from a non-terminated instance of @reg.
+ */
+u32 xe_gt_mcr_unicast_read_any(struct xe_gt *gt, struct xe_reg_mcr reg_mcr)
+{
+	const struct xe_reg reg = to_xe_reg(reg_mcr);
+	u8 group, instance;
+	u32 val;
+	bool steer;
+
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	steer = xe_gt_mcr_get_nonterminated_steering(gt, reg_mcr,
+						     &group, &instance);
+
+	if (steer) {
+		mcr_lock(gt);
+		val = rw_with_mcr_steering(gt, reg_mcr, MCR_OP_READ,
+					   group, instance, 0);
+		mcr_unlock(gt);
+	} else {
+		val = xe_mmio_read32(&gt->mmio, reg);
+	}
+
+	return val;
+}
+
+/**
+ * xe_gt_mcr_unicast_read - read a specific instance of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: the MCR register to read
+ * @group: the MCR group
+ * @instance: the MCR instance
+ *
+ * Returns the value read from an MCR register after steering toward a specific
+ * group/instance.
+ */
+u32 xe_gt_mcr_unicast_read(struct xe_gt *gt,
+			   struct xe_reg_mcr reg_mcr,
+			   int group, int instance)
+{
+	u32 val;
+
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	mcr_lock(gt);
+	val = rw_with_mcr_steering(gt, reg_mcr, MCR_OP_READ, group, instance, 0);
+	mcr_unlock(gt);
+
+	return val;
+}
+
+/**
+ * xe_gt_mcr_unicast_write - write a specific instance of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: the MCR register to write
+ * @value: value to write
+ * @group: the MCR group
+ * @instance: the MCR instance
+ *
+ * Write an MCR register in unicast mode after steering toward a specific
+ * group/instance.
+ */
+void xe_gt_mcr_unicast_write(struct xe_gt *gt, struct xe_reg_mcr reg_mcr,
+			     u32 value, int group, int instance)
+{
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	mcr_lock(gt);
+	rw_with_mcr_steering(gt, reg_mcr, MCR_OP_WRITE, group, instance, value);
+	mcr_unlock(gt);
+}
+
+/**
+ * xe_gt_mcr_multicast_write - write a value to all instances of an MCR register
+ * @gt: GT structure
+ * @reg_mcr: the MCR register to write
+ * @value: value to write
+ *
+ * Write an MCR register in multicast mode to update all instances.
+ */
+void xe_gt_mcr_multicast_write(struct xe_gt *gt, struct xe_reg_mcr reg_mcr,
+			       u32 value)
+{
+	struct xe_reg reg = to_xe_reg(reg_mcr);
+
+	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
+
+	/*
+	 * Synchronize with any unicast operations.  Once we have exclusive
+	 * access, the MULTICAST bit should already be set, so there's no need
+	 * to touch the steering register.
+	 */
+	mcr_lock(gt);
+	xe_mmio_write32(&gt->mmio, reg, value);
+	mcr_unlock(gt);
+}
+
+void xe_gt_mcr_steering_dump(struct xe_gt *gt, struct drm_printer *p)
+{
+	for (int i = 0; i < NUM_STEERING_TYPES; i++) {
+		if (gt->steering[i].ranges) {
+			drm_printf(p, "%s steering: group=%#x, instance=%#x\n",
+				   xe_steering_types[i].name,
+				   gt->steering[i].group_target,
+				   gt->steering[i].instance_target);
+			for (int j = 0; gt->steering[i].ranges[j].end; j++)
+				drm_printf(p, "\t0x%06x - 0x%06x\n",
+					   gt->steering[i].ranges[j].start,
+					   gt->steering[i].ranges[j].end);
+		}
+	}
+}