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().
  ...

5 files changed, 620 insertions, 0 deletions

diff --git a/drivers/misc/cb710/Kconfig b/drivers/misc/cb710/Kconfig
new file mode 100644
index 000000000..a696d7509
--- /dev/null
+++ b/drivers/misc/cb710/Kconfig
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config CB710_CORE
+	tristate "ENE CB710/720 Flash memory card reader support"
+	depends on PCI
+	help
+	  This option enables support for PCI ENE CB710/720 Flash memory card
+	  reader found in some laptops (ie. some versions of HP Compaq nx9500).
+
+	  You will also have to select some flash card format drivers (MMC/SD,
+	  MemoryStick).
+
+	  This driver can also be built as a module. If so, the module
+	  will be called cb710.
+
+config CB710_DEBUG
+	bool "Enable driver debugging"
+	depends on CB710_CORE != n
+	help
+	  This is an option for use by developers; most people should
+	  say N here.  This adds a lot of debugging output to dmesg.
+
+config CB710_DEBUG_ASSUMPTIONS
+	bool
+	depends on CB710_CORE != n
+	default y
diff --git a/drivers/misc/cb710/Makefile b/drivers/misc/cb710/Makefile
new file mode 100644
index 000000000..8a38c66eb
--- /dev/null
+++ b/drivers/misc/cb710/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+ccflags-$(CONFIG_CB710_DEBUG)	:= -DDEBUG
+
+obj-$(CONFIG_CB710_CORE)	+= cb710.o
+
+cb710-y				:= core.o sgbuf2.o
+cb710-$(CONFIG_CB710_DEBUG)	+= debug.o
diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
new file mode 100644
index 000000000..55b7ee0e8
--- /dev/null
+++ b/drivers/misc/cb710/core.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  cb710/core.c
+ *
+ *  Copyright by Michał Mirosław, 2008-2009
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/idr.h>
+#include <linux/cb710.h>
+#include <linux/gfp.h>
+
+static DEFINE_IDA(cb710_ida);
+
+void cb710_pci_update_config_reg(struct pci_dev *pdev,
+	int reg, uint32_t mask, uint32_t xor)
+{
+	u32 rval;
+
+	pci_read_config_dword(pdev, reg, &rval);
+	rval = (rval & mask) ^ xor;
+	pci_write_config_dword(pdev, reg, rval);
+}
+EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);
+
+/* Some magic writes based on Windows driver init code */
+static int cb710_pci_configure(struct pci_dev *pdev)
+{
+	unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
+	struct pci_dev *pdev0;
+	u32 val;
+
+	cb710_pci_update_config_reg(pdev, 0x48,
+		~0x000000FF, 0x0000003F);
+
+	pci_read_config_dword(pdev, 0x48, &val);
+	if (val & 0x80000000)
+		return 0;
+
+	pdev0 = pci_get_slot(pdev->bus, devfn);
+	if (!pdev0)
+		return -ENODEV;
+
+	if (pdev0->vendor == PCI_VENDOR_ID_ENE
+	    && pdev0->device == PCI_DEVICE_ID_ENE_720) {
+		cb710_pci_update_config_reg(pdev0, 0x8C,
+			~0x00F00000, 0x00100000);
+		cb710_pci_update_config_reg(pdev0, 0xB0,
+			~0x08000000, 0x08000000);
+	}
+
+	cb710_pci_update_config_reg(pdev0, 0x8C,
+		~0x00000F00, 0x00000200);
+	cb710_pci_update_config_reg(pdev0, 0x90,
+		~0x00060000, 0x00040000);
+
+	pci_dev_put(pdev0);
+
+	return 0;
+}
+
+static irqreturn_t cb710_irq_handler(int irq, void *data)
+{
+	struct cb710_chip *chip = data;
+	struct cb710_slot *slot = &chip->slot[0];
+	irqreturn_t handled = IRQ_NONE;
+	unsigned nr;
+
+	spin_lock(&chip->irq_lock); /* incl. smp_rmb() */
+
+	for (nr = chip->slots; nr; ++slot, --nr) {
+		cb710_irq_handler_t handler_func = slot->irq_handler;
+		if (handler_func && handler_func(slot))
+			handled = IRQ_HANDLED;
+	}
+
+	spin_unlock(&chip->irq_lock);
+
+	return handled;
+}
+
+static void cb710_release_slot(struct device *dev)
+{
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+	struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
+	struct cb710_chip *chip = cb710_slot_to_chip(slot);
+
+	/* slot struct can be freed now */
+	atomic_dec(&chip->slot_refs_count);
+#endif
+}
+
+static int cb710_register_slot(struct cb710_chip *chip,
+	unsigned slot_mask, unsigned io_offset, const char *name)
+{
+	int nr = chip->slots;
+	struct cb710_slot *slot = &chip->slot[nr];
+	int err;
+
+	dev_dbg(cb710_chip_dev(chip),
+		"register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
+		name, chip->platform_id, nr, slot_mask, io_offset);
+
+	/* slot->irq_handler == NULL here; this needs to be
+	 * seen before platform_device_register() */
+	++chip->slots;
+	smp_wmb();
+
+	slot->iobase = chip->iobase + io_offset;
+	slot->pdev.name = name;
+	slot->pdev.id = chip->platform_id;
+	slot->pdev.dev.parent = &chip->pdev->dev;
+	slot->pdev.dev.release = cb710_release_slot;
+
+	err = platform_device_register(&slot->pdev);
+
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+	atomic_inc(&chip->slot_refs_count);
+#endif
+
+	if (err) {
+		/* device_initialize() called from platform_device_register()
+		 * wants this on error path */
+		platform_device_put(&slot->pdev);
+
+		/* slot->irq_handler == NULL here anyway, so no lock needed */
+		--chip->slots;
+		return err;
+	}
+
+	chip->slot_mask |= slot_mask;
+
+	return 0;
+}
+
+static void cb710_unregister_slot(struct cb710_chip *chip,
+	unsigned slot_mask)
+{
+	int nr = chip->slots - 1;
+
+	if (!(chip->slot_mask & slot_mask))
+		return;
+
+	platform_device_unregister(&chip->slot[nr].pdev);
+
+	/* complementary to spin_unlock() in cb710_set_irq_handler() */
+	smp_rmb();
+	BUG_ON(chip->slot[nr].irq_handler != NULL);
+
+	/* slot->irq_handler == NULL here, so no lock needed */
+	--chip->slots;
+	chip->slot_mask &= ~slot_mask;
+}
+
+void cb710_set_irq_handler(struct cb710_slot *slot,
+	cb710_irq_handler_t handler)
+{
+	struct cb710_chip *chip = cb710_slot_to_chip(slot);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->irq_lock, flags);
+	slot->irq_handler = handler;
+	spin_unlock_irqrestore(&chip->irq_lock, flags);
+}
+EXPORT_SYMBOL_GPL(cb710_set_irq_handler);
+
+static int __maybe_unused cb710_suspend(struct device *dev_d)
+{
+	struct pci_dev *pdev = to_pci_dev(dev_d);
+	struct cb710_chip *chip = pci_get_drvdata(pdev);
+
+	devm_free_irq(&pdev->dev, pdev->irq, chip);
+	return 0;
+}
+
+static int __maybe_unused cb710_resume(struct device *dev_d)
+{
+	struct pci_dev *pdev = to_pci_dev(dev_d);
+	struct cb710_chip *chip = pci_get_drvdata(pdev);
+
+	return devm_request_irq(&pdev->dev, pdev->irq,
+		cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
+}
+
+static int cb710_probe(struct pci_dev *pdev,
+	const struct pci_device_id *ent)
+{
+	struct cb710_chip *chip;
+	u32 val;
+	int err;
+	int n = 0;
+
+	err = cb710_pci_configure(pdev);
+	if (err)
+		return err;
+
+	/* this is actually magic... */
+	pci_read_config_dword(pdev, 0x48, &val);
+	if (!(val & 0x80000000)) {
+		pci_write_config_dword(pdev, 0x48, val|0x71000000);
+		pci_read_config_dword(pdev, 0x48, &val);
+	}
+
+	dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
+	if (!(val & 0x70000000))
+		return -ENODEV;
+	val = (val >> 28) & 7;
+	if (val & CB710_SLOT_MMC)
+		++n;
+	if (val & CB710_SLOT_MS)
+		++n;
+	if (val & CB710_SLOT_SM)
+		++n;
+
+	chip = devm_kzalloc(&pdev->dev, struct_size(chip, slot, n),
+			    GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	err = pcim_enable_device(pdev);
+	if (err)
+		return err;
+
+	err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
+	if (err)
+		return err;
+
+	spin_lock_init(&chip->irq_lock);
+	chip->pdev = pdev;
+	chip->iobase = pcim_iomap_table(pdev)[0];
+
+	pci_set_drvdata(pdev, chip);
+
+	err = devm_request_irq(&pdev->dev, pdev->irq,
+		cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
+	if (err)
+		return err;
+
+	err = ida_alloc(&cb710_ida, GFP_KERNEL);
+	if (err < 0)
+		return err;
+	chip->platform_id = err;
+
+	dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
+		chip->platform_id, chip->iobase, pdev->irq);
+
+	if (val & CB710_SLOT_MMC) {	/* MMC/SD slot */
+		err = cb710_register_slot(chip,
+			CB710_SLOT_MMC, 0x00, "cb710-mmc");
+		if (err)
+			return err;
+	}
+
+	if (val & CB710_SLOT_MS) {	/* MemoryStick slot */
+		err = cb710_register_slot(chip,
+			CB710_SLOT_MS, 0x40, "cb710-ms");
+		if (err)
+			goto unreg_mmc;
+	}
+
+	if (val & CB710_SLOT_SM) {	/* SmartMedia slot */
+		err = cb710_register_slot(chip,
+			CB710_SLOT_SM, 0x60, "cb710-sm");
+		if (err)
+			goto unreg_ms;
+	}
+
+	return 0;
+unreg_ms:
+	cb710_unregister_slot(chip, CB710_SLOT_MS);
+unreg_mmc:
+	cb710_unregister_slot(chip, CB710_SLOT_MMC);
+
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
+#endif
+	return err;
+}
+
+static void cb710_remove_one(struct pci_dev *pdev)
+{
+	struct cb710_chip *chip = pci_get_drvdata(pdev);
+
+	cb710_unregister_slot(chip, CB710_SLOT_SM);
+	cb710_unregister_slot(chip, CB710_SLOT_MS);
+	cb710_unregister_slot(chip, CB710_SLOT_MMC);
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
+#endif
+
+	ida_free(&cb710_ida, chip->platform_id);
+}
+
+static const struct pci_device_id cb710_pci_tbl[] = {
+	{ PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
+		PCI_ANY_ID, PCI_ANY_ID, },
+	{ 0, }
+};
+
+static SIMPLE_DEV_PM_OPS(cb710_pm_ops, cb710_suspend, cb710_resume);
+
+static struct pci_driver cb710_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = cb710_pci_tbl,
+	.probe = cb710_probe,
+	.remove = cb710_remove_one,
+	.driver.pm = &cb710_pm_ops,
+};
+
+static int __init cb710_init_module(void)
+{
+	return pci_register_driver(&cb710_driver);
+}
+
+static void __exit cb710_cleanup_module(void)
+{
+	pci_unregister_driver(&cb710_driver);
+	ida_destroy(&cb710_ida);
+}
+
+module_init(cb710_init_module);
+module_exit(cb710_cleanup_module);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);
diff --git a/drivers/misc/cb710/debug.c b/drivers/misc/cb710/debug.c
new file mode 100644
index 000000000..20d672edf
--- /dev/null
+++ b/drivers/misc/cb710/debug.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  cb710/debug.c
+ *
+ *  Copyright by Michał Mirosław, 2008-2009
+ */
+#include <linux/cb710.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define CB710_REG_COUNT		0x80
+
+static const u16 allow[CB710_REG_COUNT/16] = {
+	0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
+	0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
+};
+static const char *const prefix[ARRAY_SIZE(allow)] = {
+	"MMC", "MMC", "MMC", "MMC",
+	"MS?", "MS?", "SM?", "SM?"
+};
+
+static inline int allow_reg_read(unsigned block, unsigned offset, unsigned bits)
+{
+	unsigned mask = (1 << bits/8) - 1;
+	offset *= bits/8;
+	return ((allow[block] >> offset) & mask) == mask;
+}
+
+#define CB710_READ_REGS_TEMPLATE(t)					\
+static void cb710_read_regs_##t(void __iomem *iobase,			\
+	u##t *reg, unsigned select)					\
+{									\
+	unsigned i, j;							\
+									\
+	for (i = 0; i < ARRAY_SIZE(allow); ++i, reg += 16/(t/8)) {	\
+		if (!(select & (1 << i)))					\
+			continue;					\
+									\
+		for (j = 0; j < 0x10/(t/8); ++j) {			\
+			if (!allow_reg_read(i, j, t))			\
+				continue;				\
+			reg[j] = ioread##t(iobase			\
+				+ (i << 4) + (j * (t/8)));		\
+		}							\
+	}								\
+}
+
+static const char cb710_regf_8[] = "%02X";
+static const char cb710_regf_16[] = "%04X";
+static const char cb710_regf_32[] = "%08X";
+static const char cb710_xes[] = "xxxxxxxx";
+
+#define CB710_DUMP_REGS_TEMPLATE(t)					\
+static void cb710_dump_regs_##t(struct device *dev,			\
+	const u##t *reg, unsigned select)				\
+{									\
+	const char *const xp = &cb710_xes[8 - t/4];			\
+	const char *const format = cb710_regf_##t;			\
+									\
+	char msg[100], *p;						\
+	unsigned i, j;							\
+									\
+	for (i = 0; i < ARRAY_SIZE(allow); ++i, reg += 16/(t/8)) {	\
+		if (!(select & (1 << i)))				\
+			continue;					\
+		p = msg;						\
+		for (j = 0; j < 0x10/(t/8); ++j) {			\
+			*p++ = ' ';					\
+			if (j == 8/(t/8))				\
+				*p++ = ' ';				\
+			if (allow_reg_read(i, j, t))			\
+				p += sprintf(p, format, reg[j]);	\
+			else						\
+				p += sprintf(p, "%s", xp);		\
+		}							\
+		dev_dbg(dev, "%s 0x%02X %s\n", prefix[i], i << 4, msg);	\
+	}								\
+}
+
+#define CB710_READ_AND_DUMP_REGS_TEMPLATE(t)				\
+static void cb710_read_and_dump_regs_##t(struct cb710_chip *chip,	\
+	unsigned select)						\
+{									\
+	u##t regs[CB710_REG_COUNT/sizeof(u##t)];			\
+									\
+	memset(&regs, 0, sizeof(regs));					\
+	cb710_read_regs_##t(chip->iobase, regs, select);		\
+	cb710_dump_regs_##t(cb710_chip_dev(chip), regs, select);	\
+}
+
+#define CB710_REG_ACCESS_TEMPLATES(t)		\
+  CB710_READ_REGS_TEMPLATE(t)			\
+  CB710_DUMP_REGS_TEMPLATE(t)			\
+  CB710_READ_AND_DUMP_REGS_TEMPLATE(t)
+
+CB710_REG_ACCESS_TEMPLATES(8)
+CB710_REG_ACCESS_TEMPLATES(16)
+CB710_REG_ACCESS_TEMPLATES(32)
+
+void cb710_dump_regs(struct cb710_chip *chip, unsigned select)
+{
+	if (!(select & CB710_DUMP_REGS_MASK))
+		select = CB710_DUMP_REGS_ALL;
+	if (!(select & CB710_DUMP_ACCESS_MASK))
+		select |= CB710_DUMP_ACCESS_8;
+
+	if (select & CB710_DUMP_ACCESS_32)
+		cb710_read_and_dump_regs_32(chip, select);
+	if (select & CB710_DUMP_ACCESS_16)
+		cb710_read_and_dump_regs_16(chip, select);
+	if (select & CB710_DUMP_ACCESS_8)
+		cb710_read_and_dump_regs_8(chip, select);
+}
+EXPORT_SYMBOL_GPL(cb710_dump_regs);
+
diff --git a/drivers/misc/cb710/sgbuf2.c b/drivers/misc/cb710/sgbuf2.c
new file mode 100644
index 000000000..a798fad5f
--- /dev/null
+++ b/drivers/misc/cb710/sgbuf2.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  cb710/sgbuf2.c
+ *
+ *  Copyright by Michał Mirosław, 2008-2009
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/cb710.h>
+
+static bool sg_dwiter_next(struct sg_mapping_iter *miter)
+{
+	if (sg_miter_next(miter)) {
+		miter->consumed = 0;
+		return true;
+	} else
+		return false;
+}
+
+static bool sg_dwiter_is_at_end(struct sg_mapping_iter *miter)
+{
+	return miter->length == miter->consumed && !sg_dwiter_next(miter);
+}
+
+static uint32_t sg_dwiter_read_buffer(struct sg_mapping_iter *miter)
+{
+	size_t len, left = 4;
+	uint32_t data;
+	void *addr = &data;
+
+	do {
+		len = min(miter->length - miter->consumed, left);
+		memcpy(addr, miter->addr + miter->consumed, len);
+		miter->consumed += len;
+		left -= len;
+		if (!left)
+			return data;
+		addr += len;
+	} while (sg_dwiter_next(miter));
+
+	memset(addr, 0, left);
+	return data;
+}
+
+static inline bool needs_unaligned_copy(const void *ptr)
+{
+#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+	return false;
+#else
+	return ((uintptr_t)ptr & 3) != 0;
+#endif
+}
+
+static bool sg_dwiter_get_next_block(struct sg_mapping_iter *miter, uint32_t **ptr)
+{
+	size_t len;
+
+	if (sg_dwiter_is_at_end(miter))
+		return true;
+
+	len = miter->length - miter->consumed;
+
+	if (likely(len >= 4 && !needs_unaligned_copy(
+			miter->addr + miter->consumed))) {
+		*ptr = miter->addr + miter->consumed;
+		miter->consumed += 4;
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * cb710_sg_dwiter_read_next_block() - get next 32-bit word from sg buffer
+ * @miter: sg mapping iterator used for reading
+ *
+ * Description:
+ *   Returns 32-bit word starting at byte pointed to by @miter@
+ *   handling any alignment issues.  Bytes past the buffer's end
+ *   are not accessed (read) but are returned as zeroes.  @miter@
+ *   is advanced by 4 bytes or to the end of buffer whichever is
+ *   closer.
+ *
+ * Context:
+ *   Same requirements as in sg_miter_next().
+ *
+ * Returns:
+ *   32-bit word just read.
+ */
+uint32_t cb710_sg_dwiter_read_next_block(struct sg_mapping_iter *miter)
+{
+	uint32_t *ptr = NULL;
+
+	if (likely(sg_dwiter_get_next_block(miter, &ptr)))
+		return ptr ? *ptr : 0;
+
+	return sg_dwiter_read_buffer(miter);
+}
+EXPORT_SYMBOL_GPL(cb710_sg_dwiter_read_next_block);
+
+static void sg_dwiter_write_slow(struct sg_mapping_iter *miter, uint32_t data)
+{
+	size_t len, left = 4;
+	void *addr = &data;
+
+	do {
+		len = min(miter->length - miter->consumed, left);
+		memcpy(miter->addr, addr, len);
+		miter->consumed += len;
+		left -= len;
+		if (!left)
+			return;
+		addr += len;
+	} while (sg_dwiter_next(miter));
+}
+
+/**
+ * cb710_sg_dwiter_write_next_block() - write next 32-bit word to sg buffer
+ * @miter: sg mapping iterator used for writing
+ * @data: data to write to sg buffer
+ *
+ * Description:
+ *   Writes 32-bit word starting at byte pointed to by @miter@
+ *   handling any alignment issues.  Bytes which would be written
+ *   past the buffer's end are silently discarded. @miter@ is
+ *   advanced by 4 bytes or to the end of buffer whichever is closer.
+ *
+ * Context:
+ *   Same requirements as in sg_miter_next().
+ */
+void cb710_sg_dwiter_write_next_block(struct sg_mapping_iter *miter, uint32_t data)
+{
+	uint32_t *ptr = NULL;
+
+	if (likely(sg_dwiter_get_next_block(miter, &ptr))) {
+		if (ptr)
+			*ptr = data;
+		else
+			return;
+	} else
+		sg_dwiter_write_slow(miter, data);
+}
+EXPORT_SYMBOL_GPL(cb710_sg_dwiter_write_next_block);
+