Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 759 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
new file mode 100644
index 000000000..ea86c1ab5
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
@@ -0,0 +1,759 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "i915_drv.h"
+
+#include "intel_gt_mcr.h"
+#include "intel_gt_regs.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 a (i.e., a single write updates all
+ * instances of the register to the same value) or unicast (a write updates only
+ * one specific instance).  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.
+ */
+
+#define HAS_MSLICE_STEERING(dev_priv)	(INTEL_INFO(dev_priv)->has_mslice_steering)
+
+static const char * const intel_steering_types[] = {
+	"L3BANK",
+	"MSLICE",
+	"LNCF",
+	"GAM",
+	"DSS",
+	"OADDRM",
+	"INSTANCE 0",
+};
+
+static const struct intel_mmio_range icl_l3bank_steering_table[] = {
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+/*
+ * Although the bspec lists more "MSLICE" ranges than shown here, some of those
+ * are of a "GAM" subclass that has special rules.  Thus we use a separate
+ * GAM table farther down for those.
+ */
+static const struct intel_mmio_range xehpsdv_mslice_steering_table[] = {
+	{ 0x00DD00, 0x00DDFF },
+	{ 0x00E900, 0x00FFFF }, /* 0xEA00 - OxEFFF is unused */
+	{},
+};
+
+static const struct intel_mmio_range xehpsdv_gam_steering_table[] = {
+	{ 0x004000, 0x004AFF },
+	{ 0x00C800, 0x00CFFF },
+	{},
+};
+
+static const struct intel_mmio_range xehpsdv_lncf_steering_table[] = {
+	{ 0x00B000, 0x00B0FF },
+	{ 0x00D800, 0x00D8FF },
+	{},
+};
+
+static const struct intel_mmio_range dg2_lncf_steering_table[] = {
+	{ 0x00B000, 0x00B0FF },
+	{ 0x00D880, 0x00D8FF },
+	{},
+};
+
+/*
+ * We have several types of MCR registers on PVC 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 intel_mmio_range pvc_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 intel_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 intel_mmio_range xelpg_l3bank_steering_table[] = {
+	{ 0x00B100, 0x00B3FF },
+	{},
+};
+
+/* DSS steering is used for SLICE ranges as well */
+static const struct intel_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 intel_mmio_range xelpmp_oaddrm_steering_table[] = {
+	{ 0x393200, 0x39323F },
+	{ 0x393400, 0x3934FF },
+	{},
+};
+
+void intel_gt_mcr_init(struct intel_gt *gt)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	unsigned long fuse;
+	int i;
+
+	/*
+	 * An mslice is unavailable only if both the meml3 for the slice is
+	 * disabled *and* all of the DSS in the slice (quadrant) are disabled.
+	 */
+	if (HAS_MSLICE_STEERING(i915)) {
+		gt->info.mslice_mask =
+			intel_slicemask_from_xehp_dssmask(gt->info.sseu.subslice_mask,
+							  GEN_DSS_PER_MSLICE);
+		gt->info.mslice_mask |=
+			(intel_uncore_read(gt->uncore, GEN10_MIRROR_FUSE3) &
+			 GEN12_MEML3_EN_MASK);
+
+		if (!gt->info.mslice_mask) /* should be impossible! */
+			drm_warn(&i915->drm, "mslice mask all zero!\n");
+	}
+
+	if (MEDIA_VER(i915) >= 13 && gt->type == GT_MEDIA) {
+		gt->steering_table[OADDRM] = xelpmp_oaddrm_steering_table;
+	} else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70)) {
+		fuse = REG_FIELD_GET(GT_L3_EXC_MASK,
+				     intel_uncore_read(gt->uncore, XEHP_FUSE4));
+
+		/*
+		 * Despite the register field being named "exclude mask" the
+		 * bits actually represent enabled banks (two banks per bit).
+		 */
+		for_each_set_bit(i, &fuse, 3)
+			gt->info.l3bank_mask |= 0x3 << 2 * i;
+
+		gt->steering_table[INSTANCE0] = xelpg_instance0_steering_table;
+		gt->steering_table[L3BANK] = xelpg_l3bank_steering_table;
+		gt->steering_table[DSS] = xelpg_dss_steering_table;
+	} else if (IS_PONTEVECCHIO(i915)) {
+		gt->steering_table[INSTANCE0] = pvc_instance0_steering_table;
+	} else if (IS_DG2(i915)) {
+		gt->steering_table[MSLICE] = xehpsdv_mslice_steering_table;
+		gt->steering_table[LNCF] = dg2_lncf_steering_table;
+		/*
+		 * No need to hook up the GAM table since it has a dedicated
+		 * steering control register on DG2 and can use implicit
+		 * steering.
+		 */
+	} else if (IS_XEHPSDV(i915)) {
+		gt->steering_table[MSLICE] = xehpsdv_mslice_steering_table;
+		gt->steering_table[LNCF] = xehpsdv_lncf_steering_table;
+		gt->steering_table[GAM] = xehpsdv_gam_steering_table;
+	} else if (GRAPHICS_VER(i915) >= 11 &&
+		   GRAPHICS_VER_FULL(i915) < IP_VER(12, 50)) {
+		gt->steering_table[L3BANK] = icl_l3bank_steering_table;
+		gt->info.l3bank_mask =
+			~intel_uncore_read(gt->uncore, GEN10_MIRROR_FUSE3) &
+			GEN10_L3BANK_MASK;
+		if (!gt->info.l3bank_mask) /* should be impossible! */
+			drm_warn(&i915->drm, "L3 bank mask is all zero!\n");
+	} else if (GRAPHICS_VER(i915) >= 11) {
+		/*
+		 * We expect all modern platforms to have at least some
+		 * type of steering that needs to be initialized.
+		 */
+		MISSING_CASE(INTEL_INFO(i915)->platform);
+	}
+}
+
+/*
+ * Although the rest of the driver should use MCR-specific functions to
+ * read/write MCR registers, we still use the regular intel_uncore_* functions
+ * internally to implement those, so we need a way for the functions in this
+ * file to "cast" an i915_mcr_reg_t into an i915_reg_t.
+ */
+static i915_reg_t mcr_reg_cast(const i915_mcr_reg_t mcr)
+{
+	i915_reg_t r = { .reg = mcr.reg };
+
+	return r;
+}
+
+/*
+ * rw_with_mcr_steering_fw - Access a register with specific MCR steering
+ * @uncore: pointer to struct intel_uncore
+ * @reg: register being accessed
+ * @rw_flag: FW_REG_READ for read access or FW_REG_WRITE for write access
+ * @group: group number (documented as "sliceid" on older platforms)
+ * @instance: instance number (documented as "subsliceid" on older platforms)
+ * @value: register value to be written (ignored for read)
+ *
+ * Return: 0 for write access. register value for read access.
+ *
+ * Caller needs to make sure the relevant forcewake wells are up.
+ */
+static u32 rw_with_mcr_steering_fw(struct intel_uncore *uncore,
+				   i915_mcr_reg_t reg, u8 rw_flag,
+				   int group, int instance, u32 value)
+{
+	u32 mcr_mask, mcr_ss, mcr, old_mcr, val = 0;
+
+	lockdep_assert_held(&uncore->lock);
+
+	if (GRAPHICS_VER_FULL(uncore->i915) >= IP_VER(12, 70)) {
+		/*
+		 * Always leave the hardware in multicast mode when doing reads
+		 * (see comment about Wa_22013088509 below) and only change it
+		 * to unicast mode when doing writes of a specific instance.
+		 *
+		 * No need to save old steering reg value.
+		 */
+		intel_uncore_write_fw(uncore, MTL_MCR_SELECTOR,
+				      REG_FIELD_PREP(MTL_MCR_GROUPID, group) |
+				      REG_FIELD_PREP(MTL_MCR_INSTANCEID, instance) |
+				      (rw_flag == FW_REG_READ ? GEN11_MCR_MULTICAST : 0));
+	} else if (GRAPHICS_VER(uncore->i915) >= 11) {
+		mcr_mask = GEN11_MCR_SLICE_MASK | GEN11_MCR_SUBSLICE_MASK;
+		mcr_ss = GEN11_MCR_SLICE(group) | GEN11_MCR_SUBSLICE(instance);
+
+		/*
+		 * Wa_22013088509
+		 *
+		 * 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 have a workaround requiring us
+		 * to remain in multicast mode for reads.  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 exlicitly doing a write operation.
+		 */
+		if (rw_flag == FW_REG_WRITE)
+			mcr_mask |= GEN11_MCR_MULTICAST;
+
+		mcr = intel_uncore_read_fw(uncore, GEN8_MCR_SELECTOR);
+		old_mcr = mcr;
+
+		mcr &= ~mcr_mask;
+		mcr |= mcr_ss;
+		intel_uncore_write_fw(uncore, GEN8_MCR_SELECTOR, mcr);
+	} else {
+		mcr_mask = GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK;
+		mcr_ss = GEN8_MCR_SLICE(group) | GEN8_MCR_SUBSLICE(instance);
+
+		mcr = intel_uncore_read_fw(uncore, GEN8_MCR_SELECTOR);
+		old_mcr = mcr;
+
+		mcr &= ~mcr_mask;
+		mcr |= mcr_ss;
+		intel_uncore_write_fw(uncore, GEN8_MCR_SELECTOR, mcr);
+	}
+
+	if (rw_flag == FW_REG_READ)
+		val = intel_uncore_read_fw(uncore, mcr_reg_cast(reg));
+	else
+		intel_uncore_write_fw(uncore, mcr_reg_cast(reg), value);
+
+	/*
+	 * For pre-MTL platforms, we need to restore the old value of the
+	 * steering control register to ensure that implicit steering continues
+	 * to behave as expected.  For MTL and beyond, we need only reinstate
+	 * the 'multicast' bit (and only if we did a write that cleared it).
+	 */
+	if (GRAPHICS_VER_FULL(uncore->i915) >= IP_VER(12, 70) && rw_flag == FW_REG_WRITE)
+		intel_uncore_write_fw(uncore, MTL_MCR_SELECTOR, GEN11_MCR_MULTICAST);
+	else if (GRAPHICS_VER_FULL(uncore->i915) < IP_VER(12, 70))
+		intel_uncore_write_fw(uncore, GEN8_MCR_SELECTOR, old_mcr);
+
+	return val;
+}
+
+static u32 rw_with_mcr_steering(struct intel_uncore *uncore,
+				i915_mcr_reg_t reg, u8 rw_flag,
+				int group, int instance,
+				u32 value)
+{
+	enum forcewake_domains fw_domains;
+	u32 val;
+
+	fw_domains = intel_uncore_forcewake_for_reg(uncore, mcr_reg_cast(reg),
+						    rw_flag);
+	fw_domains |= intel_uncore_forcewake_for_reg(uncore,
+						     GEN8_MCR_SELECTOR,
+						     FW_REG_READ | FW_REG_WRITE);
+
+	spin_lock_irq(&uncore->lock);
+	intel_uncore_forcewake_get__locked(uncore, fw_domains);
+
+	val = rw_with_mcr_steering_fw(uncore, reg, rw_flag, group, instance, value);
+
+	intel_uncore_forcewake_put__locked(uncore, fw_domains);
+	spin_unlock_irq(&uncore->lock);
+
+	return val;
+}
+
+/**
+ * intel_gt_mcr_read - read a specific instance of an MCR register
+ * @gt: GT structure
+ * @reg: 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 intel_gt_mcr_read(struct intel_gt *gt,
+		      i915_mcr_reg_t reg,
+		      int group, int instance)
+{
+	return rw_with_mcr_steering(gt->uncore, reg, FW_REG_READ, group, instance, 0);
+}
+
+/**
+ * intel_gt_mcr_unicast_write - write a specific instance of an MCR register
+ * @gt: GT structure
+ * @reg: 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 intel_gt_mcr_unicast_write(struct intel_gt *gt, i915_mcr_reg_t reg, u32 value,
+				int group, int instance)
+{
+	rw_with_mcr_steering(gt->uncore, reg, FW_REG_WRITE, group, instance, value);
+}
+
+/**
+ * intel_gt_mcr_multicast_write - write a value to all instances of an MCR register
+ * @gt: GT structure
+ * @reg: the MCR register to write
+ * @value: value to write
+ *
+ * Write an MCR register in multicast mode to update all instances.
+ */
+void intel_gt_mcr_multicast_write(struct intel_gt *gt,
+				  i915_mcr_reg_t reg, u32 value)
+{
+	/*
+	 * Ensure we have multicast behavior, just in case some non-i915 agent
+	 * left the hardware in unicast mode.
+	 */
+	if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70))
+		intel_uncore_write_fw(gt->uncore, MTL_MCR_SELECTOR, GEN11_MCR_MULTICAST);
+
+	intel_uncore_write(gt->uncore, mcr_reg_cast(reg), value);
+}
+
+/**
+ * intel_gt_mcr_multicast_write_fw - write a value to all instances of an MCR register
+ * @gt: GT structure
+ * @reg: the MCR register to write
+ * @value: value to write
+ *
+ * Write an MCR register in multicast mode to update all instances.  This
+ * function assumes the caller is already holding any necessary forcewake
+ * domains; use intel_gt_mcr_multicast_write() in cases where forcewake should
+ * be obtained automatically.
+ */
+void intel_gt_mcr_multicast_write_fw(struct intel_gt *gt, i915_mcr_reg_t reg, u32 value)
+{
+	/*
+	 * Ensure we have multicast behavior, just in case some non-i915 agent
+	 * left the hardware in unicast mode.
+	 */
+	if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70))
+		intel_uncore_write_fw(gt->uncore, MTL_MCR_SELECTOR, GEN11_MCR_MULTICAST);
+
+	intel_uncore_write_fw(gt->uncore, mcr_reg_cast(reg), value);
+}
+
+/**
+ * intel_gt_mcr_multicast_rmw - Performs a multicast RMW operations
+ * @gt: GT structure
+ * @reg: the MCR register to read and write
+ * @clear: bits to clear during RMW
+ * @set: bits to set during RMW
+ *
+ * Performs a read-modify-write on an MCR register in a multicast manner.
+ * This operation only makes sense on MCR registers where all instances are
+ * expected to have the same value.  The read will target any non-terminated
+ * instance and the write will be applied to all instances.
+ *
+ * This function assumes the caller is already holding any necessary forcewake
+ * domains; use intel_gt_mcr_multicast_rmw() in cases where forcewake should
+ * be obtained automatically.
+ *
+ * Returns the old (unmodified) value read.
+ */
+u32 intel_gt_mcr_multicast_rmw(struct intel_gt *gt, i915_mcr_reg_t reg,
+			       u32 clear, u32 set)
+{
+	u32 val = intel_gt_mcr_read_any(gt, reg);
+
+	intel_gt_mcr_multicast_write(gt, reg, (val & ~clear) | set);
+
+	return val;
+}
+
+/*
+ * reg_needs_read_steering - determine whether a register read requires
+ *     explicit steering
+ * @gt: GT structure
+ * @reg: the register to check steering requirements for
+ * @type: type of multicast steering to check
+ *
+ * Determines whether @reg needs explicit steering of a specific type for
+ * reads.
+ *
+ * Returns false if @reg does not belong to a register range of the given
+ * steering type, or if the default (subslice-based) steering IDs are suitable
+ * for @type steering too.
+ */
+static bool reg_needs_read_steering(struct intel_gt *gt,
+				    i915_mcr_reg_t reg,
+				    enum intel_steering_type type)
+{
+	const u32 offset = i915_mmio_reg_offset(reg);
+	const struct intel_mmio_range *entry;
+
+	if (likely(!gt->steering_table[type]))
+		return false;
+
+	for (entry = gt->steering_table[type]; entry->end; entry++) {
+		if (offset >= entry->start && offset <= entry->end)
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * get_nonterminated_steering - determines valid IDs for a class of MCR steering
+ * @gt: GT structure
+ * @type: multicast register type
+ * @group: Group ID returned
+ * @instance: Instance ID returned
+ *
+ * Determines group and instance values that will steer reads of the specified
+ * MCR class to a non-terminated instance.
+ */
+static void get_nonterminated_steering(struct intel_gt *gt,
+				       enum intel_steering_type type,
+				       u8 *group, u8 *instance)
+{
+	u32 dss;
+
+	switch (type) {
+	case L3BANK:
+		*group = 0;		/* unused */
+		*instance = __ffs(gt->info.l3bank_mask);
+		break;
+	case MSLICE:
+		GEM_WARN_ON(!HAS_MSLICE_STEERING(gt->i915));
+		*group = __ffs(gt->info.mslice_mask);
+		*instance = 0;	/* unused */
+		break;
+	case LNCF:
+		/*
+		 * An LNCF is always present if its mslice is present, so we
+		 * can safely just steer to LNCF 0 in all cases.
+		 */
+		GEM_WARN_ON(!HAS_MSLICE_STEERING(gt->i915));
+		*group = __ffs(gt->info.mslice_mask) << 1;
+		*instance = 0;	/* unused */
+		break;
+	case GAM:
+		*group = IS_DG2(gt->i915) ? 1 : 0;
+		*instance = 0;
+		break;
+	case DSS:
+		dss = intel_sseu_find_first_xehp_dss(&gt->info.sseu, 0, 0);
+		*group = dss / GEN_DSS_PER_GSLICE;
+		*instance = dss % GEN_DSS_PER_GSLICE;
+		break;
+	case INSTANCE0:
+		/*
+		 * There are a lot of MCR types for which instance (0, 0)
+		 * will always provide a non-terminated value.
+		 */
+		*group = 0;
+		*instance = 0;
+		break;
+	case OADDRM:
+		if ((VDBOX_MASK(gt) | VEBOX_MASK(gt) | gt->info.sfc_mask) & BIT(0))
+			*group = 0;
+		else
+			*group = 1;
+		*instance = 0;
+		break;
+	default:
+		MISSING_CASE(type);
+		*group = 0;
+		*instance = 0;
+	}
+}
+
+/**
+ * intel_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.
+ */
+void intel_gt_mcr_get_nonterminated_steering(struct intel_gt *gt,
+					     i915_mcr_reg_t reg,
+					     u8 *group, u8 *instance)
+{
+	int type;
+
+	for (type = 0; type < NUM_STEERING_TYPES; type++) {
+		if (reg_needs_read_steering(gt, reg, type)) {
+			get_nonterminated_steering(gt, type, group, instance);
+			return;
+		}
+	}
+
+	*group = gt->default_steering.groupid;
+	*instance = gt->default_steering.instanceid;
+}
+
+/**
+ * intel_gt_mcr_read_any_fw - reads one instance of an MCR register
+ * @gt: GT structure
+ * @reg: 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; use intel_gt_mcr_read_any() in cases where forcewake should be
+ * obtained automatically.
+ *
+ * Returns the value from a non-terminated instance of @reg.
+ */
+u32 intel_gt_mcr_read_any_fw(struct intel_gt *gt, i915_mcr_reg_t reg)
+{
+	int type;
+	u8 group, instance;
+
+	for (type = 0; type < NUM_STEERING_TYPES; type++) {
+		if (reg_needs_read_steering(gt, reg, type)) {
+			get_nonterminated_steering(gt, type, &group, &instance);
+			return rw_with_mcr_steering_fw(gt->uncore, reg,
+						       FW_REG_READ,
+						       group, instance, 0);
+		}
+	}
+
+	return intel_uncore_read_fw(gt->uncore, mcr_reg_cast(reg));
+}
+
+/**
+ * intel_gt_mcr_read_any - reads one instance of an MCR register
+ * @gt: GT structure
+ * @reg: 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).
+ *
+ * Returns the value from a non-terminated instance of @reg.
+ */
+u32 intel_gt_mcr_read_any(struct intel_gt *gt, i915_mcr_reg_t reg)
+{
+	int type;
+	u8 group, instance;
+
+	for (type = 0; type < NUM_STEERING_TYPES; type++) {
+		if (reg_needs_read_steering(gt, reg, type)) {
+			get_nonterminated_steering(gt, type, &group, &instance);
+			return rw_with_mcr_steering(gt->uncore, reg,
+						    FW_REG_READ,
+						    group, instance, 0);
+		}
+	}
+
+	return intel_uncore_read(gt->uncore, mcr_reg_cast(reg));
+}
+
+static void report_steering_type(struct drm_printer *p,
+				 struct intel_gt *gt,
+				 enum intel_steering_type type,
+				 bool dump_table)
+{
+	const struct intel_mmio_range *entry;
+	u8 group, instance;
+
+	BUILD_BUG_ON(ARRAY_SIZE(intel_steering_types) != NUM_STEERING_TYPES);
+
+	if (!gt->steering_table[type]) {
+		drm_printf(p, "%s steering: uses default steering\n",
+			   intel_steering_types[type]);
+		return;
+	}
+
+	get_nonterminated_steering(gt, type, &group, &instance);
+	drm_printf(p, "%s steering: group=0x%x, instance=0x%x\n",
+		   intel_steering_types[type], group, instance);
+
+	if (!dump_table)
+		return;
+
+	for (entry = gt->steering_table[type]; entry->end; entry++)
+		drm_printf(p, "\t0x%06x - 0x%06x\n", entry->start, entry->end);
+}
+
+void intel_gt_mcr_report_steering(struct drm_printer *p, struct intel_gt *gt,
+				  bool dump_table)
+{
+	/*
+	 * Starting with MTL we no longer have default steering;
+	 * all ranges are explicitly steered.
+	 */
+	if (GRAPHICS_VER_FULL(gt->i915) < IP_VER(12, 70))
+		drm_printf(p, "Default steering: group=0x%x, instance=0x%x\n",
+			   gt->default_steering.groupid,
+			   gt->default_steering.instanceid);
+
+	if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70)) {
+		for (int i = 0; i < NUM_STEERING_TYPES; i++)
+			if (gt->steering_table[i])
+				report_steering_type(p, gt, i, dump_table);
+	} else if (IS_PONTEVECCHIO(gt->i915)) {
+		report_steering_type(p, gt, INSTANCE0, dump_table);
+	} else if (HAS_MSLICE_STEERING(gt->i915)) {
+		report_steering_type(p, gt, MSLICE, dump_table);
+		report_steering_type(p, gt, LNCF, dump_table);
+	}
+}
+
+/**
+ * intel_gt_mcr_get_ss_steering - returns the group/instance steering for a SS
+ * @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
+ *
+ * Returns the steering IDs (via the @group and @instance parameters) that
+ * correspond to a specific subslice/DSS ID.
+ */
+void intel_gt_mcr_get_ss_steering(struct intel_gt *gt, unsigned int dss,
+				   unsigned int *group, unsigned int *instance)
+{
+	if (IS_PONTEVECCHIO(gt->i915)) {
+		*group = dss / GEN_DSS_PER_CSLICE;
+		*instance = dss % GEN_DSS_PER_CSLICE;
+	} else if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 50)) {
+		*group = dss / GEN_DSS_PER_GSLICE;
+		*instance = dss % GEN_DSS_PER_GSLICE;
+	} else {
+		*group = dss / GEN_MAX_SS_PER_HSW_SLICE;
+		*instance = dss % GEN_MAX_SS_PER_HSW_SLICE;
+		return;
+	}
+}
+
+/**
+ * intel_gt_mcr_wait_for_reg - wait until MCR register matches expected state
+ * @gt: GT structure
+ * @reg: the register to read
+ * @mask: mask to apply to register value
+ * @value: value to wait for
+ * @fast_timeout_us: fast timeout in microsecond for atomic/tight wait
+ * @slow_timeout_ms: slow timeout in millisecond
+ *
+ * This routine waits until the target register @reg contains the expected
+ * @value after applying the @mask, i.e. it waits until ::
+ *
+ *     (intel_gt_mcr_read_any_fw(gt, reg) & mask) == value
+ *
+ * Otherwise, the wait will timeout after @slow_timeout_ms milliseconds.
+ * For atomic context @slow_timeout_ms must be zero and @fast_timeout_us
+ * must be not larger than 20,0000 microseconds.
+ *
+ * This function is basically an MCR-friendly version of
+ * __intel_wait_for_register_fw().  Generally this function will only be used
+ * on GAM registers which are a bit special --- although they're MCR registers,
+ * reads (e.g., waiting for status updates) are always directed to the primary
+ * instance.
+ *
+ * Note that this routine assumes the caller holds forcewake asserted, it is
+ * not suitable for very long waits.
+ *
+ * Return: 0 if the register matches the desired condition, or -ETIMEDOUT.
+ */
+int intel_gt_mcr_wait_for_reg(struct intel_gt *gt,
+			      i915_mcr_reg_t reg,
+			      u32 mask,
+			      u32 value,
+			      unsigned int fast_timeout_us,
+			      unsigned int slow_timeout_ms)
+{
+	int ret;
+
+	lockdep_assert_not_held(&gt->uncore->lock);
+
+#define done ((intel_gt_mcr_read_any(gt, reg) & mask) == value)
+
+	/* Catch any overuse of this function */
+	might_sleep_if(slow_timeout_ms);
+	GEM_BUG_ON(fast_timeout_us > 20000);
+	GEM_BUG_ON(!fast_timeout_us && !slow_timeout_ms);
+
+	ret = -ETIMEDOUT;
+	if (fast_timeout_us && fast_timeout_us <= 20000)
+		ret = _wait_for_atomic(done, fast_timeout_us, 0);
+	if (ret && slow_timeout_ms)
+		ret = wait_for(done, slow_timeout_ms);
+
+	return ret;
+#undef done
+}