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().
  ...

6 files changed, 733 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/Kbuild b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/Kbuild
new file mode 100644
index 000000000..5124a0c41
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/Kbuild
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: MIT
+nvkm-y += nvkm/subdev/mxm/base.o
+nvkm-y += nvkm/subdev/mxm/mxms.o
+nvkm-y += nvkm/subdev/mxm/nv50.o
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c
new file mode 100644
index 000000000..c1acfe642
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright 2011 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "mxms.h"
+
+#include <core/option.h>
+#include <subdev/bios.h>
+#include <subdev/bios/mxm.h>
+#include <subdev/i2c.h>
+
+static bool
+mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
+		     u8 offset, u8 size, u8 *data)
+{
+	struct i2c_msg msgs[] = {
+		{ .addr = addr, .flags = 0, .len = 1, .buf = &offset },
+		{ .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
+	};
+
+	return i2c_transfer(&bus->i2c, msgs, 2) == 2;
+}
+
+static bool
+mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
+{
+	struct nvkm_device *device = mxm->subdev.device;
+	struct nvkm_bios *bios = device->bios;
+	struct nvkm_i2c *i2c = device->i2c;
+	struct nvkm_i2c_bus *bus = NULL;
+	u8 i2cidx, mxms[6], addr, size;
+
+	i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
+	if (i2cidx < 0x0f)
+		bus = nvkm_i2c_bus_find(i2c, i2cidx);
+	if (!bus)
+		return false;
+
+	addr = 0x54;
+	if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
+		addr = 0x56;
+		if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
+			return false;
+	}
+
+	mxm->mxms = mxms;
+	size = mxms_headerlen(mxm) + mxms_structlen(mxm);
+	mxm->mxms = kmalloc(size, GFP_KERNEL);
+
+	if (mxm->mxms &&
+	    mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
+		return true;
+
+	kfree(mxm->mxms);
+	mxm->mxms = NULL;
+	return false;
+}
+
+#if defined(CONFIG_ACPI)
+static bool
+mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version)
+{
+	struct nvkm_subdev *subdev = &mxm->subdev;
+	struct nvkm_device *device = subdev->device;
+	static guid_t muid =
+		GUID_INIT(0x4004A400, 0x917D, 0x4CF2,
+			  0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65);
+	u32 mxms_args[] = { 0x00000000 };
+	union acpi_object argv4 = {
+		.buffer.type = ACPI_TYPE_BUFFER,
+		.buffer.length = sizeof(mxms_args),
+		.buffer.pointer = (char *)mxms_args,
+	};
+	union acpi_object *obj;
+	acpi_handle handle;
+	int rev;
+
+	handle = ACPI_HANDLE(device->dev);
+	if (!handle)
+		return false;
+
+	/*
+	 * spec says this can be zero to mean "highest revision", but
+	 * of course there's at least one bios out there which fails
+	 * unless you pass in exactly the version it supports..
+	 */
+	rev = (version & 0xf0) << 4 | (version & 0x0f);
+	obj = acpi_evaluate_dsm(handle, &muid, rev, 0x00000010, &argv4);
+	if (!obj) {
+		nvkm_debug(subdev, "DSM MXMS failed\n");
+		return false;
+	}
+
+	if (obj->type == ACPI_TYPE_BUFFER) {
+		mxm->mxms = kmemdup(obj->buffer.pointer,
+					 obj->buffer.length, GFP_KERNEL);
+	} else if (obj->type == ACPI_TYPE_INTEGER) {
+		nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n",
+			   obj->integer.value);
+	}
+
+	ACPI_FREE(obj);
+	return mxm->mxms != NULL;
+}
+#endif
+
+#if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
+
+#define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
+
+static u8
+wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version)
+{
+	struct nvkm_subdev *subdev = &mxm->subdev;
+	u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
+	struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
+	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+
+	status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
+	if (ACPI_FAILURE(status)) {
+		nvkm_debug(subdev, "WMMX MXMI returned %d\n", status);
+		return 0x00;
+	}
+
+	obj = retn.pointer;
+	if (obj->type == ACPI_TYPE_INTEGER) {
+		version = obj->integer.value;
+		nvkm_debug(subdev, "WMMX MXMI version %d.%d\n",
+			   (version >> 4), version & 0x0f);
+	} else {
+		version = 0;
+		nvkm_debug(subdev, "WMMX MXMI returned non-integer\n");
+	}
+
+	kfree(obj);
+	return version;
+}
+
+static bool
+mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
+{
+	struct nvkm_subdev *subdev = &mxm->subdev;
+	u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
+	struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
+	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+
+	if (!wmi_has_guid(WMI_WMMX_GUID)) {
+		nvkm_debug(subdev, "WMMX GUID not found\n");
+		return false;
+	}
+
+	mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
+	if (!mxms_args[1])
+		mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
+	if (!mxms_args[1])
+		return false;
+
+	status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
+	if (ACPI_FAILURE(status)) {
+		nvkm_debug(subdev, "WMMX MXMS returned %d\n", status);
+		return false;
+	}
+
+	obj = retn.pointer;
+	if (obj->type == ACPI_TYPE_BUFFER) {
+		mxm->mxms = kmemdup(obj->buffer.pointer,
+				    obj->buffer.length, GFP_KERNEL);
+	}
+
+	kfree(obj);
+	return mxm->mxms != NULL;
+}
+#endif
+
+static struct mxm_shadow_h {
+	const char *name;
+	bool (*exec)(struct nvkm_mxm *, u8 version);
+} _mxm_shadow[] = {
+	{ "ROM", mxm_shadow_rom },
+#if defined(CONFIG_ACPI)
+	{ "DSM", mxm_shadow_dsm },
+#endif
+#if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
+	{ "WMI", mxm_shadow_wmi },
+#endif
+	{}
+};
+
+static int
+mxm_shadow(struct nvkm_mxm *mxm, u8 version)
+{
+	struct mxm_shadow_h *shadow = _mxm_shadow;
+	do {
+		nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name);
+		if (shadow->exec(mxm, version)) {
+			if (mxms_valid(mxm))
+				return 0;
+			kfree(mxm->mxms);
+			mxm->mxms = NULL;
+		}
+	} while ((++shadow)->name);
+	return -ENOENT;
+}
+
+static const struct nvkm_subdev_func
+nvkm_mxm = {
+};
+
+int
+nvkm_mxm_new_(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
+	      struct nvkm_mxm **pmxm)
+{
+	struct nvkm_bios *bios = device->bios;
+	struct nvkm_mxm *mxm;
+	u8  ver, len;
+	u16 data;
+
+	if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL)))
+		return -ENOMEM;
+
+	nvkm_subdev_ctor(&nvkm_mxm, device, type, inst, &mxm->subdev);
+
+	data = mxm_table(bios, &ver, &len);
+	if (!data || !(ver = nvbios_rd08(bios, data))) {
+		nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");
+		return 0;
+	}
+
+	nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
+	nvkm_debug(&mxm->subdev, "module flags: %02x\n",
+		   nvbios_rd08(bios, data + 0x01));
+	nvkm_debug(&mxm->subdev, "config flags: %02x\n",
+		   nvbios_rd08(bios, data + 0x02));
+
+	if (mxm_shadow(mxm, ver)) {
+		nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");
+#if 0
+		/* we should, perhaps, fall back to some kind of limited
+		 * mode here if the x86 vbios hasn't already done the
+		 * work for us (so we prevent loading with completely
+		 * whacked vbios tables).
+		 */
+		return -EINVAL;
+#else
+		return 0;
+#endif
+	}
+
+	nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",
+		   mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
+	mxms_foreach(mxm, 0, NULL, NULL);
+
+	if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))
+		mxm->action |= MXM_SANITISE_DCB;
+	return 0;
+}
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c
new file mode 100644
index 000000000..9abfa5e2f
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "mxms.h"
+
+#define ROM16(x) get_unaligned_le16(&(x))
+#define ROM32(x) get_unaligned_le32(&(x))
+
+static u8 *
+mxms_data(struct nvkm_mxm *mxm)
+{
+	return mxm->mxms;
+
+}
+
+u16
+mxms_version(struct nvkm_mxm *mxm)
+{
+	u8 *mxms = mxms_data(mxm);
+	u16 version = (mxms[4] << 8) | mxms[5];
+	switch (version ) {
+	case 0x0200:
+	case 0x0201:
+	case 0x0300:
+		return version;
+	default:
+		break;
+	}
+
+	nvkm_debug(&mxm->subdev, "unknown version %d.%d\n", mxms[4], mxms[5]);
+	return 0x0000;
+}
+
+u16
+mxms_headerlen(struct nvkm_mxm *mxm)
+{
+	return 8;
+}
+
+u16
+mxms_structlen(struct nvkm_mxm *mxm)
+{
+	return *(u16 *)&mxms_data(mxm)[6];
+}
+
+bool
+mxms_checksum(struct nvkm_mxm *mxm)
+{
+	u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
+	u8 *mxms = mxms_data(mxm), sum = 0;
+	while (size--)
+		sum += *mxms++;
+	if (sum) {
+		nvkm_debug(&mxm->subdev, "checksum invalid\n");
+		return false;
+	}
+	return true;
+}
+
+bool
+mxms_valid(struct nvkm_mxm *mxm)
+{
+	u8 *mxms = mxms_data(mxm);
+	if (*(u32 *)mxms != 0x5f4d584d) {
+		nvkm_debug(&mxm->subdev, "signature invalid\n");
+		return false;
+	}
+
+	if (!mxms_version(mxm) || !mxms_checksum(mxm))
+		return false;
+
+	return true;
+}
+
+bool
+mxms_foreach(struct nvkm_mxm *mxm, u8 types,
+	     bool (*exec)(struct nvkm_mxm *, u8 *, void *), void *info)
+{
+	struct nvkm_subdev *subdev = &mxm->subdev;
+	u8 *mxms = mxms_data(mxm);
+	u8 *desc = mxms + mxms_headerlen(mxm);
+	u8 *fini = desc + mxms_structlen(mxm) - 1;
+	while (desc < fini) {
+		u8 type = desc[0] & 0x0f;
+		u8 headerlen = 0;
+		u8 recordlen = 0;
+		u8 entries = 0;
+
+		switch (type) {
+		case 0: /* Output Device Structure */
+			if (mxms_version(mxm) >= 0x0300)
+				headerlen = 8;
+			else
+				headerlen = 6;
+			break;
+		case 1: /* System Cooling Capability Structure */
+		case 2: /* Thermal Structure */
+		case 3: /* Input Power Structure */
+			headerlen = 4;
+			break;
+		case 4: /* GPIO Device Structure */
+			headerlen = 4;
+			recordlen = 2;
+			entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
+			break;
+		case 5: /* Vendor Specific Structure */
+			headerlen = 8;
+			break;
+		case 6: /* Backlight Control Structure */
+			if (mxms_version(mxm) >= 0x0300) {
+				headerlen = 4;
+				recordlen = 8;
+				entries   = (desc[1] & 0xf0) >> 4;
+			} else {
+				headerlen = 8;
+			}
+			break;
+		case 7: /* Fan Control Structure */
+			headerlen = 8;
+			recordlen = 4;
+			entries   = desc[1] & 0x07;
+			break;
+		default:
+			nvkm_debug(subdev, "unknown descriptor type %d\n", type);
+			return false;
+		}
+
+		if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) {
+			static const char * mxms_desc[] = {
+				"ODS", "SCCS", "TS", "IPS",
+				"GSD", "VSS", "BCS", "FCS",
+			};
+			u8 *dump = desc;
+			char data[32], *ptr;
+			int i, j;
+
+			for (j = headerlen - 1, ptr = data; j >= 0; j--)
+				ptr += sprintf(ptr, "%02x", dump[j]);
+			dump += headerlen;
+
+			nvkm_debug(subdev, "%4s: %s\n", mxms_desc[type], data);
+			for (i = 0; i < entries; i++, dump += recordlen) {
+				for (j = recordlen - 1, ptr = data; j >= 0; j--)
+					ptr += sprintf(ptr, "%02x", dump[j]);
+				nvkm_debug(subdev, "      %s\n", data);
+			}
+		}
+
+		if (types & (1 << type)) {
+			if (!exec(mxm, desc, info))
+				return false;
+		}
+
+		desc += headerlen + (entries * recordlen);
+	}
+
+	return true;
+}
+
+void
+mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
+{
+	u64 data = ROM32(pdata[0]);
+	if (mxms_version(mxm) >= 0x0300)
+		data |= (u64)ROM16(pdata[4]) << 32;
+
+	desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
+	desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
+	desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
+	desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
+}
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.h b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.h
new file mode 100644
index 000000000..d9676b282
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef __NVMXM_MXMS_H__
+#define __NVMXM_MXMS_H__
+#include "priv.h"
+
+struct mxms_odev {
+	u8 outp_type;
+	u8 conn_type;
+	u8 ddc_port;
+	u8 dig_conn;
+};
+
+void mxms_output_device(struct nvkm_mxm *, u8 *, struct mxms_odev *);
+
+u16  mxms_version(struct nvkm_mxm *);
+u16  mxms_headerlen(struct nvkm_mxm *);
+u16  mxms_structlen(struct nvkm_mxm *);
+bool mxms_checksum(struct nvkm_mxm *);
+bool mxms_valid(struct nvkm_mxm *);
+
+bool mxms_foreach(struct nvkm_mxm *, u8,
+		  bool (*)(struct nvkm_mxm *, u8 *, void *), void *);
+#endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c
new file mode 100644
index 000000000..f3167904d
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright 2011 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "mxms.h"
+
+#include <subdev/bios.h>
+#include <subdev/bios/conn.h>
+#include <subdev/bios/dcb.h>
+#include <subdev/bios/mxm.h>
+
+struct context {
+	u32 *outp;
+	struct mxms_odev desc;
+};
+
+static bool
+mxm_match_tmds_partner(struct nvkm_mxm *mxm, u8 *data, void *info)
+{
+	struct context *ctx = info;
+	struct mxms_odev desc;
+
+	mxms_output_device(mxm, data, &desc);
+	if (desc.outp_type == 2 &&
+	    desc.dig_conn == ctx->desc.dig_conn)
+		return false;
+	return true;
+}
+
+static bool
+mxm_match_dcb(struct nvkm_mxm *mxm, u8 *data, void *info)
+{
+	struct nvkm_bios *bios = mxm->subdev.device->bios;
+	struct context *ctx = info;
+	u64 desc = *(u64 *)data;
+
+	mxms_output_device(mxm, data, &ctx->desc);
+
+	/* match dcb encoder type to mxm-ods device type */
+	if ((ctx->outp[0] & 0x0000000f) != ctx->desc.outp_type)
+		return true;
+
+	/* digital output, have some extra stuff to match here, there's a
+	 * table in the vbios that provides a mapping from the mxm digital
+	 * connection enum values to SOR/link
+	 */
+	if ((desc & 0x00000000000000f0) >= 0x20) {
+		/* check against sor index */
+		u8 link = mxm_sor_map(bios, ctx->desc.dig_conn);
+		if ((ctx->outp[0] & 0x0f000000) != (link & 0x0f) << 24)
+			return true;
+
+		/* check dcb entry has a compatible link field */
+		link = (link & 0x30) >> 4;
+		if ((link & ((ctx->outp[1] & 0x00000030) >> 4)) != link)
+			return true;
+	}
+
+	/* mark this descriptor accounted for by setting invalid device type,
+	 * except of course some manufactures don't follow specs properly and
+	 * we need to avoid killing off the TMDS function on DP connectors
+	 * if MXM-SIS is missing an entry for it.
+	 */
+	data[0] &= ~0xf0;
+	if (ctx->desc.outp_type == 6 && ctx->desc.conn_type == 6 &&
+	    mxms_foreach(mxm, 0x01, mxm_match_tmds_partner, ctx)) {
+		data[0] |= 0x20; /* modify descriptor to match TMDS now */
+	} else {
+		data[0] |= 0xf0;
+	}
+
+	return false;
+}
+
+static int
+mxm_dcb_sanitise_entry(struct nvkm_bios *bios, void *data, int idx, u16 pdcb)
+{
+	struct nvkm_mxm *mxm = data;
+	struct context ctx = { .outp = (u32 *)(bios->data + pdcb) };
+	u8 type, i2cidx, link, ver, len;
+	u8 *conn;
+
+	/* look for an output device structure that matches this dcb entry.
+	 * if one isn't found, disable it.
+	 */
+	if (mxms_foreach(mxm, 0x01, mxm_match_dcb, &ctx)) {
+		nvkm_debug(&mxm->subdev, "disable %d: %08x %08x\n",
+			   idx, ctx.outp[0], ctx.outp[1]);
+		ctx.outp[0] |= 0x0000000f;
+		return 0;
+	}
+
+	/* modify the output's ddc/aux port, there's a pointer to a table
+	 * with the mapping from mxm ddc/aux port to dcb i2c_index in the
+	 * vbios mxm table
+	 */
+	i2cidx = mxm_ddc_map(bios, ctx.desc.ddc_port);
+	if ((ctx.outp[0] & 0x0000000f) != DCB_OUTPUT_DP)
+		i2cidx = (i2cidx & 0x0f) << 4;
+	else
+		i2cidx = (i2cidx & 0xf0);
+
+	if (i2cidx != 0xf0) {
+		ctx.outp[0] &= ~0x000000f0;
+		ctx.outp[0] |= i2cidx;
+	}
+
+	/* override dcb sorconf.link, based on what mxm data says */
+	switch (ctx.desc.outp_type) {
+	case 0x00: /* Analog CRT */
+	case 0x01: /* Analog TV/HDTV */
+		break;
+	default:
+		link = mxm_sor_map(bios, ctx.desc.dig_conn) & 0x30;
+		ctx.outp[1] &= ~0x00000030;
+		ctx.outp[1] |= link;
+		break;
+	}
+
+	/* we may need to fixup various other vbios tables based on what
+	 * the descriptor says the connector type should be.
+	 *
+	 * in a lot of cases, the vbios tables will claim DVI-I is possible,
+	 * and the mxm data says the connector is really HDMI.  another
+	 * common example is DP->eDP.
+	 */
+	conn  = bios->data;
+	conn += nvbios_connEe(bios, (ctx.outp[0] & 0x0000f000) >> 12, &ver, &len);
+	type  = conn[0];
+	switch (ctx.desc.conn_type) {
+	case 0x01: /* LVDS */
+		ctx.outp[1] |= 0x00000004; /* use_power_scripts */
+		/* XXX: modify default link width in LVDS table */
+		break;
+	case 0x02: /* HDMI */
+		type = DCB_CONNECTOR_HDMI_1;
+		break;
+	case 0x03: /* DVI-D */
+		type = DCB_CONNECTOR_DVI_D;
+		break;
+	case 0x0e: /* eDP, falls through to DPint */
+		ctx.outp[1] |= 0x00010000;
+		fallthrough;
+	case 0x07: /* DP internal, wtf is this?? HP8670w */
+		ctx.outp[1] |= 0x00000004; /* use_power_scripts? */
+		type = DCB_CONNECTOR_eDP;
+		break;
+	default:
+		break;
+	}
+
+	if (mxms_version(mxm) >= 0x0300)
+		conn[0] = type;
+
+	return 0;
+}
+
+static bool
+mxm_show_unmatched(struct nvkm_mxm *mxm, u8 *data, void *info)
+{
+	struct nvkm_subdev *subdev = &mxm->subdev;
+	u64 desc = *(u64 *)data;
+	if ((desc & 0xf0) != 0xf0)
+		nvkm_info(subdev, "unmatched output device %016llx\n", desc);
+	return true;
+}
+
+static void
+mxm_dcb_sanitise(struct nvkm_mxm *mxm)
+{
+	struct nvkm_subdev *subdev = &mxm->subdev;
+	struct nvkm_bios *bios = subdev->device->bios;
+	u8  ver, hdr, cnt, len;
+	u16 dcb = dcb_table(bios, &ver, &hdr, &cnt, &len);
+	if (dcb == 0x0000 || (ver != 0x40 && ver != 0x41)) {
+		nvkm_warn(subdev, "unsupported DCB version\n");
+		return;
+	}
+
+	dcb_outp_foreach(bios, mxm, mxm_dcb_sanitise_entry);
+	mxms_foreach(mxm, 0x01, mxm_show_unmatched, NULL);
+}
+
+int
+nv50_mxm_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
+	     struct nvkm_subdev **pmxm)
+{
+	struct nvkm_mxm *mxm;
+	int ret;
+
+	ret = nvkm_mxm_new_(device, type, inst, &mxm);
+	if (mxm)
+		*pmxm = &mxm->subdev;
+	if (ret)
+		return ret;
+
+	if (mxm->action & MXM_SANITISE_DCB)
+		mxm_dcb_sanitise(mxm);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/priv.h
new file mode 100644
index 000000000..fcacb6c6a
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/priv.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef __NVKM_MXM_PRIV_H__
+#define __NVKM_MXM_PRIV_H__
+#define nvkm_mxm(p) container_of((p), struct nvkm_mxm, subdev)
+#include <subdev/mxm.h>
+
+#define MXM_SANITISE_DCB 0x00000001
+
+struct nvkm_mxm {
+	struct nvkm_subdev subdev;
+	u32 action;
+	u8 *mxms;
+};
+
+int nvkm_mxm_new_(struct nvkm_device *, enum nvkm_subdev_type, int, struct nvkm_mxm **);
+#endif