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, 656 insertions, 0 deletions

diff --git a/drivers/edac/dmc520_edac.c b/drivers/edac/dmc520_edac.c
new file mode 100644
index 000000000..1fa5ca57e
--- /dev/null
+++ b/drivers/edac/dmc520_edac.c
@@ -0,0 +1,656 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * EDAC driver for DMC-520 memory controller.
+ *
+ * The driver supports 10 interrupt lines,
+ * though only dram_ecc_errc and dram_ecc_errd are currently handled.
+ *
+ * Authors:	Rui Zhao <ruizhao@microsoft.com>
+ *		Lei Wang <lewan@microsoft.com>
+ *		Shiping Ji <shji@microsoft.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/edac.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include "edac_mc.h"
+
+/* DMC-520 registers */
+#define REG_OFFSET_FEATURE_CONFIG			0x130
+#define REG_OFFSET_ECC_ERRC_COUNT_31_00		0x158
+#define REG_OFFSET_ECC_ERRC_COUNT_63_32		0x15C
+#define REG_OFFSET_ECC_ERRD_COUNT_31_00		0x160
+#define REG_OFFSET_ECC_ERRD_COUNT_63_32		0x164
+#define REG_OFFSET_INTERRUPT_CONTROL			0x500
+#define REG_OFFSET_INTERRUPT_CLR			0x508
+#define REG_OFFSET_INTERRUPT_STATUS			0x510
+#define REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_31_00	0x528
+#define REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_63_32	0x52C
+#define REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_31_00	0x530
+#define REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_63_32	0x534
+#define REG_OFFSET_ADDRESS_CONTROL_NOW			0x1010
+#define REG_OFFSET_MEMORY_TYPE_NOW			0x1128
+#define REG_OFFSET_SCRUB_CONTROL0_NOW			0x1170
+#define REG_OFFSET_FORMAT_CONTROL			0x18
+
+/* DMC-520 types, masks and bitfields */
+#define RAM_ECC_INT_CE_BIT			BIT(0)
+#define RAM_ECC_INT_UE_BIT			BIT(1)
+#define DRAM_ECC_INT_CE_BIT			BIT(2)
+#define DRAM_ECC_INT_UE_BIT			BIT(3)
+#define FAILED_ACCESS_INT_BIT			BIT(4)
+#define FAILED_PROG_INT_BIT			BIT(5)
+#define LINK_ERR_INT_BIT			BIT(6)
+#define TEMPERATURE_EVENT_INT_BIT		BIT(7)
+#define ARCH_FSM_INT_BIT			BIT(8)
+#define PHY_REQUEST_INT_BIT			BIT(9)
+#define MEMORY_WIDTH_MASK			GENMASK(1, 0)
+#define SCRUB_TRIGGER0_NEXT_MASK		GENMASK(1, 0)
+#define REG_FIELD_DRAM_ECC_ENABLED		GENMASK(1, 0)
+#define REG_FIELD_MEMORY_TYPE			GENMASK(2, 0)
+#define REG_FIELD_DEVICE_WIDTH			GENMASK(9, 8)
+#define REG_FIELD_ADDRESS_CONTROL_COL		GENMASK(2,  0)
+#define REG_FIELD_ADDRESS_CONTROL_ROW		GENMASK(10, 8)
+#define REG_FIELD_ADDRESS_CONTROL_BANK		GENMASK(18, 16)
+#define REG_FIELD_ADDRESS_CONTROL_RANK		GENMASK(25, 24)
+#define REG_FIELD_ERR_INFO_LOW_VALID		BIT(0)
+#define REG_FIELD_ERR_INFO_LOW_COL		GENMASK(10, 1)
+#define REG_FIELD_ERR_INFO_LOW_ROW		GENMASK(28, 11)
+#define REG_FIELD_ERR_INFO_LOW_RANK		GENMASK(31, 29)
+#define REG_FIELD_ERR_INFO_HIGH_BANK		GENMASK(3, 0)
+#define REG_FIELD_ERR_INFO_HIGH_VALID		BIT(31)
+
+#define DRAM_ADDRESS_CONTROL_MIN_COL_BITS	8
+#define DRAM_ADDRESS_CONTROL_MIN_ROW_BITS	11
+
+#define DMC520_SCRUB_TRIGGER_ERR_DETECT	2
+#define DMC520_SCRUB_TRIGGER_IDLE		3
+
+/* Driver settings */
+/*
+ * The max-length message would be: "rank:7 bank:15 row:262143 col:1023".
+ * Max length is 34. Using a 40-size buffer is enough.
+ */
+#define DMC520_MSG_BUF_SIZE			40
+#define EDAC_MOD_NAME				"dmc520-edac"
+#define EDAC_CTL_NAME				"dmc520"
+
+/* the data bus width for the attached memory chips. */
+enum dmc520_mem_width {
+	MEM_WIDTH_X32 = 2,
+	MEM_WIDTH_X64 = 3
+};
+
+/* memory type */
+enum dmc520_mem_type {
+	MEM_TYPE_DDR3 = 1,
+	MEM_TYPE_DDR4 = 2
+};
+
+/* memory device width */
+enum dmc520_dev_width {
+	DEV_WIDTH_X4 = 0,
+	DEV_WIDTH_X8 = 1,
+	DEV_WIDTH_X16 = 2
+};
+
+struct ecc_error_info {
+	u32 col;
+	u32 row;
+	u32 bank;
+	u32 rank;
+};
+
+/* The interrupt config */
+struct dmc520_irq_config {
+	char *name;
+	int mask;
+};
+
+/* The interrupt mappings */
+static struct dmc520_irq_config dmc520_irq_configs[] = {
+	{
+		.name = "ram_ecc_errc",
+		.mask = RAM_ECC_INT_CE_BIT
+	},
+	{
+		.name = "ram_ecc_errd",
+		.mask = RAM_ECC_INT_UE_BIT
+	},
+	{
+		.name = "dram_ecc_errc",
+		.mask = DRAM_ECC_INT_CE_BIT
+	},
+	{
+		.name = "dram_ecc_errd",
+		.mask = DRAM_ECC_INT_UE_BIT
+	},
+	{
+		.name = "failed_access",
+		.mask = FAILED_ACCESS_INT_BIT
+	},
+	{
+		.name = "failed_prog",
+		.mask = FAILED_PROG_INT_BIT
+	},
+	{
+		.name = "link_err",
+		.mask = LINK_ERR_INT_BIT
+	},
+	{
+		.name = "temperature_event",
+		.mask = TEMPERATURE_EVENT_INT_BIT
+	},
+	{
+		.name = "arch_fsm",
+		.mask = ARCH_FSM_INT_BIT
+	},
+	{
+		.name = "phy_request",
+		.mask = PHY_REQUEST_INT_BIT
+	}
+};
+
+#define NUMBER_OF_IRQS				ARRAY_SIZE(dmc520_irq_configs)
+
+/*
+ * The EDAC driver private data.
+ * error_lock is to protect concurrent writes to the mci->error_desc through
+ * edac_mc_handle_error().
+ */
+struct dmc520_edac {
+	void __iomem *reg_base;
+	spinlock_t error_lock;
+	u32 mem_width_in_bytes;
+	int irqs[NUMBER_OF_IRQS];
+	int masks[NUMBER_OF_IRQS];
+};
+
+static int dmc520_mc_idx;
+
+static u32 dmc520_read_reg(struct dmc520_edac *pvt, u32 offset)
+{
+	return readl(pvt->reg_base + offset);
+}
+
+static void dmc520_write_reg(struct dmc520_edac *pvt, u32 val, u32 offset)
+{
+	writel(val, pvt->reg_base + offset);
+}
+
+static u32 dmc520_calc_dram_ecc_error(u32 value)
+{
+	u32 total = 0;
+
+	/* Each rank's error counter takes one byte. */
+	while (value > 0) {
+		total += (value & 0xFF);
+		value >>= 8;
+	}
+	return total;
+}
+
+static u32 dmc520_get_dram_ecc_error_count(struct dmc520_edac *pvt,
+					    bool is_ce)
+{
+	u32 reg_offset_low, reg_offset_high;
+	u32 err_low, err_high;
+	u32 err_count;
+
+	reg_offset_low = is_ce ? REG_OFFSET_ECC_ERRC_COUNT_31_00 :
+				 REG_OFFSET_ECC_ERRD_COUNT_31_00;
+	reg_offset_high = is_ce ? REG_OFFSET_ECC_ERRC_COUNT_63_32 :
+				  REG_OFFSET_ECC_ERRD_COUNT_63_32;
+
+	err_low = dmc520_read_reg(pvt, reg_offset_low);
+	err_high = dmc520_read_reg(pvt, reg_offset_high);
+	/* Reset error counters */
+	dmc520_write_reg(pvt, 0, reg_offset_low);
+	dmc520_write_reg(pvt, 0, reg_offset_high);
+
+	err_count = dmc520_calc_dram_ecc_error(err_low) +
+		   dmc520_calc_dram_ecc_error(err_high);
+
+	return err_count;
+}
+
+static void dmc520_get_dram_ecc_error_info(struct dmc520_edac *pvt,
+					    bool is_ce,
+					    struct ecc_error_info *info)
+{
+	u32 reg_offset_low, reg_offset_high;
+	u32 reg_val_low, reg_val_high;
+	bool valid;
+
+	reg_offset_low = is_ce ? REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_31_00 :
+				 REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_31_00;
+	reg_offset_high = is_ce ? REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_63_32 :
+				  REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_63_32;
+
+	reg_val_low = dmc520_read_reg(pvt, reg_offset_low);
+	reg_val_high = dmc520_read_reg(pvt, reg_offset_high);
+
+	valid = (FIELD_GET(REG_FIELD_ERR_INFO_LOW_VALID, reg_val_low) != 0) &&
+		(FIELD_GET(REG_FIELD_ERR_INFO_HIGH_VALID, reg_val_high) != 0);
+
+	if (valid) {
+		info->col = FIELD_GET(REG_FIELD_ERR_INFO_LOW_COL, reg_val_low);
+		info->row = FIELD_GET(REG_FIELD_ERR_INFO_LOW_ROW, reg_val_low);
+		info->rank = FIELD_GET(REG_FIELD_ERR_INFO_LOW_RANK, reg_val_low);
+		info->bank = FIELD_GET(REG_FIELD_ERR_INFO_HIGH_BANK, reg_val_high);
+	} else {
+		memset(info, 0, sizeof(*info));
+	}
+}
+
+static bool dmc520_is_ecc_enabled(void __iomem *reg_base)
+{
+	u32 reg_val = readl(reg_base + REG_OFFSET_FEATURE_CONFIG);
+
+	return FIELD_GET(REG_FIELD_DRAM_ECC_ENABLED, reg_val);
+}
+
+static enum scrub_type dmc520_get_scrub_type(struct dmc520_edac *pvt)
+{
+	enum scrub_type type = SCRUB_NONE;
+	u32 reg_val, scrub_cfg;
+
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_SCRUB_CONTROL0_NOW);
+	scrub_cfg = FIELD_GET(SCRUB_TRIGGER0_NEXT_MASK, reg_val);
+
+	if (scrub_cfg == DMC520_SCRUB_TRIGGER_ERR_DETECT ||
+	    scrub_cfg == DMC520_SCRUB_TRIGGER_IDLE)
+		type = SCRUB_HW_PROG;
+
+	return type;
+}
+
+/* Get the memory data bus width, in number of bytes. */
+static u32 dmc520_get_memory_width(struct dmc520_edac *pvt)
+{
+	enum dmc520_mem_width mem_width_field;
+	u32 mem_width_in_bytes = 0;
+	u32 reg_val;
+
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_FORMAT_CONTROL);
+	mem_width_field = FIELD_GET(MEMORY_WIDTH_MASK, reg_val);
+
+	if (mem_width_field == MEM_WIDTH_X32)
+		mem_width_in_bytes = 4;
+	else if (mem_width_field == MEM_WIDTH_X64)
+		mem_width_in_bytes = 8;
+	return mem_width_in_bytes;
+}
+
+static enum mem_type dmc520_get_mtype(struct dmc520_edac *pvt)
+{
+	enum mem_type mt = MEM_UNKNOWN;
+	enum dmc520_mem_type type;
+	u32 reg_val;
+
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_MEMORY_TYPE_NOW);
+	type = FIELD_GET(REG_FIELD_MEMORY_TYPE, reg_val);
+
+	switch (type) {
+	case MEM_TYPE_DDR3:
+		mt = MEM_DDR3;
+		break;
+
+	case MEM_TYPE_DDR4:
+		mt = MEM_DDR4;
+		break;
+	}
+
+	return mt;
+}
+
+static enum dev_type dmc520_get_dtype(struct dmc520_edac *pvt)
+{
+	enum dmc520_dev_width device_width;
+	enum dev_type dt = DEV_UNKNOWN;
+	u32 reg_val;
+
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_MEMORY_TYPE_NOW);
+	device_width = FIELD_GET(REG_FIELD_DEVICE_WIDTH, reg_val);
+
+	switch (device_width) {
+	case DEV_WIDTH_X4:
+		dt = DEV_X4;
+		break;
+
+	case DEV_WIDTH_X8:
+		dt = DEV_X8;
+		break;
+
+	case DEV_WIDTH_X16:
+		dt = DEV_X16;
+		break;
+	}
+
+	return dt;
+}
+
+static u32 dmc520_get_rank_count(void __iomem *reg_base)
+{
+	u32 reg_val, rank_bits;
+
+	reg_val = readl(reg_base + REG_OFFSET_ADDRESS_CONTROL_NOW);
+	rank_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_RANK, reg_val);
+
+	return BIT(rank_bits);
+}
+
+static u64 dmc520_get_rank_size(struct dmc520_edac *pvt)
+{
+	u32 reg_val, col_bits, row_bits, bank_bits;
+
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_ADDRESS_CONTROL_NOW);
+
+	col_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_COL, reg_val) +
+		   DRAM_ADDRESS_CONTROL_MIN_COL_BITS;
+	row_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_ROW, reg_val) +
+		   DRAM_ADDRESS_CONTROL_MIN_ROW_BITS;
+	bank_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_BANK, reg_val);
+
+	return (u64)pvt->mem_width_in_bytes << (col_bits + row_bits + bank_bits);
+}
+
+static void dmc520_handle_dram_ecc_errors(struct mem_ctl_info *mci,
+					   bool is_ce)
+{
+	struct dmc520_edac *pvt = mci->pvt_info;
+	char message[DMC520_MSG_BUF_SIZE];
+	struct ecc_error_info info;
+	u32 cnt;
+
+	dmc520_get_dram_ecc_error_info(pvt, is_ce, &info);
+
+	cnt = dmc520_get_dram_ecc_error_count(pvt, is_ce);
+	if (!cnt)
+		return;
+
+	snprintf(message, ARRAY_SIZE(message),
+		 "rank:%d bank:%d row:%d col:%d",
+		 info.rank, info.bank,
+		 info.row, info.col);
+
+	spin_lock(&pvt->error_lock);
+	edac_mc_handle_error((is_ce ? HW_EVENT_ERR_CORRECTED :
+			     HW_EVENT_ERR_UNCORRECTED),
+			     mci, cnt, 0, 0, 0, info.rank, -1, -1,
+			     message, "");
+	spin_unlock(&pvt->error_lock);
+}
+
+static irqreturn_t dmc520_edac_dram_ecc_isr(int irq, struct mem_ctl_info *mci,
+					     bool is_ce)
+{
+	struct dmc520_edac *pvt = mci->pvt_info;
+	u32 i_mask;
+
+	i_mask = is_ce ? DRAM_ECC_INT_CE_BIT : DRAM_ECC_INT_UE_BIT;
+
+	dmc520_handle_dram_ecc_errors(mci, is_ce);
+
+	dmc520_write_reg(pvt, i_mask, REG_OFFSET_INTERRUPT_CLR);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dmc520_edac_dram_all_isr(int irq, struct mem_ctl_info *mci,
+					     u32 irq_mask)
+{
+	struct dmc520_edac *pvt = mci->pvt_info;
+	irqreturn_t irq_ret = IRQ_NONE;
+	u32 status;
+
+	status = dmc520_read_reg(pvt, REG_OFFSET_INTERRUPT_STATUS);
+
+	if ((irq_mask & DRAM_ECC_INT_CE_BIT) &&
+		(status & DRAM_ECC_INT_CE_BIT))
+		irq_ret = dmc520_edac_dram_ecc_isr(irq, mci, true);
+
+	if ((irq_mask & DRAM_ECC_INT_UE_BIT) &&
+		(status & DRAM_ECC_INT_UE_BIT))
+		irq_ret = dmc520_edac_dram_ecc_isr(irq, mci, false);
+
+	return irq_ret;
+}
+
+static irqreturn_t dmc520_isr(int irq, void *data)
+{
+	struct mem_ctl_info *mci = data;
+	struct dmc520_edac *pvt = mci->pvt_info;
+	u32 mask = 0;
+	int idx;
+
+	for (idx = 0; idx < NUMBER_OF_IRQS; idx++) {
+		if (pvt->irqs[idx] == irq) {
+			mask = pvt->masks[idx];
+			break;
+		}
+	}
+	return dmc520_edac_dram_all_isr(irq, mci, mask);
+}
+
+static void dmc520_init_csrow(struct mem_ctl_info *mci)
+{
+	struct dmc520_edac *pvt = mci->pvt_info;
+	struct csrow_info *csi;
+	struct dimm_info *dimm;
+	u32 pages_per_rank;
+	enum dev_type dt;
+	enum mem_type mt;
+	int row, ch;
+	u64 rs;
+
+	dt = dmc520_get_dtype(pvt);
+	mt = dmc520_get_mtype(pvt);
+	rs = dmc520_get_rank_size(pvt);
+	pages_per_rank = rs >> PAGE_SHIFT;
+
+	for (row = 0; row < mci->nr_csrows; row++) {
+		csi = mci->csrows[row];
+
+		for (ch = 0; ch < csi->nr_channels; ch++) {
+			dimm		= csi->channels[ch]->dimm;
+			dimm->grain	= pvt->mem_width_in_bytes;
+			dimm->dtype	= dt;
+			dimm->mtype	= mt;
+			dimm->edac_mode	= EDAC_SECDED;
+			dimm->nr_pages	= pages_per_rank / csi->nr_channels;
+		}
+	}
+}
+
+static int dmc520_edac_probe(struct platform_device *pdev)
+{
+	bool registered[NUMBER_OF_IRQS] = { false };
+	int irqs[NUMBER_OF_IRQS] = { -ENXIO };
+	int masks[NUMBER_OF_IRQS] = { 0 };
+	struct edac_mc_layer layers[1];
+	struct dmc520_edac *pvt = NULL;
+	struct mem_ctl_info *mci;
+	void __iomem *reg_base;
+	u32 irq_mask_all = 0;
+	struct resource *res;
+	struct device *dev;
+	int ret, idx, irq;
+	u32 reg_val;
+
+	/* Parse the device node */
+	dev = &pdev->dev;
+
+	for (idx = 0; idx < NUMBER_OF_IRQS; idx++) {
+		irq = platform_get_irq_byname_optional(pdev, dmc520_irq_configs[idx].name);
+		irqs[idx] = irq;
+		masks[idx] = dmc520_irq_configs[idx].mask;
+		if (irq >= 0) {
+			irq_mask_all |= dmc520_irq_configs[idx].mask;
+			edac_dbg(0, "Discovered %s, irq: %d.\n", dmc520_irq_configs[idx].name, irq);
+		}
+	}
+
+	if (!irq_mask_all) {
+		edac_printk(KERN_ERR, EDAC_MOD_NAME,
+			    "At least one valid interrupt line is expected.\n");
+		return -EINVAL;
+	}
+
+	/* Initialize dmc520 edac */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(reg_base))
+		return PTR_ERR(reg_base);
+
+	if (!dmc520_is_ecc_enabled(reg_base))
+		return -ENXIO;
+
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = dmc520_get_rank_count(reg_base);
+	layers[0].is_virt_csrow = true;
+
+	mci = edac_mc_alloc(dmc520_mc_idx++, ARRAY_SIZE(layers), layers, sizeof(*pvt));
+	if (!mci) {
+		edac_printk(KERN_ERR, EDAC_MOD_NAME,
+			    "Failed to allocate memory for mc instance\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	pvt = mci->pvt_info;
+
+	pvt->reg_base = reg_base;
+	spin_lock_init(&pvt->error_lock);
+	memcpy(pvt->irqs, irqs, sizeof(irqs));
+	memcpy(pvt->masks, masks, sizeof(masks));
+
+	platform_set_drvdata(pdev, mci);
+
+	mci->pdev = dev;
+	mci->mtype_cap		= MEM_FLAG_DDR3 | MEM_FLAG_DDR4;
+	mci->edac_ctl_cap	= EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+	mci->edac_cap		= EDAC_FLAG_SECDED;
+	mci->scrub_cap		= SCRUB_FLAG_HW_SRC;
+	mci->scrub_mode		= dmc520_get_scrub_type(pvt);
+	mci->ctl_name		= EDAC_CTL_NAME;
+	mci->dev_name		= dev_name(mci->pdev);
+	mci->mod_name		= EDAC_MOD_NAME;
+
+	edac_op_state = EDAC_OPSTATE_INT;
+
+	pvt->mem_width_in_bytes = dmc520_get_memory_width(pvt);
+
+	dmc520_init_csrow(mci);
+
+	/* Clear interrupts, not affecting other unrelated interrupts */
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_INTERRUPT_CONTROL);
+	dmc520_write_reg(pvt, reg_val & (~irq_mask_all),
+			 REG_OFFSET_INTERRUPT_CONTROL);
+	dmc520_write_reg(pvt, irq_mask_all, REG_OFFSET_INTERRUPT_CLR);
+
+	for (idx = 0; idx < NUMBER_OF_IRQS; idx++) {
+		irq = irqs[idx];
+		if (irq >= 0) {
+			ret = devm_request_irq(&pdev->dev, irq,
+					       dmc520_isr, IRQF_SHARED,
+					       dev_name(&pdev->dev), mci);
+			if (ret < 0) {
+				edac_printk(KERN_ERR, EDAC_MC,
+					    "Failed to request irq %d\n", irq);
+				goto err;
+			}
+			registered[idx] = true;
+		}
+	}
+
+	/* Reset DRAM CE/UE counters */
+	if (irq_mask_all & DRAM_ECC_INT_CE_BIT)
+		dmc520_get_dram_ecc_error_count(pvt, true);
+
+	if (irq_mask_all & DRAM_ECC_INT_UE_BIT)
+		dmc520_get_dram_ecc_error_count(pvt, false);
+
+	ret = edac_mc_add_mc(mci);
+	if (ret) {
+		edac_printk(KERN_ERR, EDAC_MOD_NAME,
+			    "Failed to register with EDAC core\n");
+		goto err;
+	}
+
+	/* Enable interrupts, not affecting other unrelated interrupts */
+	dmc520_write_reg(pvt, reg_val | irq_mask_all,
+			 REG_OFFSET_INTERRUPT_CONTROL);
+
+	return 0;
+
+err:
+	for (idx = 0; idx < NUMBER_OF_IRQS; idx++) {
+		if (registered[idx])
+			devm_free_irq(&pdev->dev, pvt->irqs[idx], mci);
+	}
+	if (mci)
+		edac_mc_free(mci);
+
+	return ret;
+}
+
+static int dmc520_edac_remove(struct platform_device *pdev)
+{
+	u32 reg_val, idx, irq_mask_all = 0;
+	struct mem_ctl_info *mci;
+	struct dmc520_edac *pvt;
+
+	mci = platform_get_drvdata(pdev);
+	pvt = mci->pvt_info;
+
+	/* Disable interrupts */
+	reg_val = dmc520_read_reg(pvt, REG_OFFSET_INTERRUPT_CONTROL);
+	dmc520_write_reg(pvt, reg_val & (~irq_mask_all),
+			 REG_OFFSET_INTERRUPT_CONTROL);
+
+	/* free irq's */
+	for (idx = 0; idx < NUMBER_OF_IRQS; idx++) {
+		if (pvt->irqs[idx] >= 0) {
+			irq_mask_all |= pvt->masks[idx];
+			devm_free_irq(&pdev->dev, pvt->irqs[idx], mci);
+		}
+	}
+
+	edac_mc_del_mc(&pdev->dev);
+	edac_mc_free(mci);
+
+	return 0;
+}
+
+static const struct of_device_id dmc520_edac_driver_id[] = {
+	{ .compatible = "arm,dmc-520", },
+	{ /* end of table */ }
+};
+
+MODULE_DEVICE_TABLE(of, dmc520_edac_driver_id);
+
+static struct platform_driver dmc520_edac_driver = {
+	.driver = {
+		.name = "dmc520",
+		.of_match_table = dmc520_edac_driver_id,
+	},
+
+	.probe = dmc520_edac_probe,
+	.remove = dmc520_edac_remove
+};
+
+module_platform_driver(dmc520_edac_driver);
+
+MODULE_AUTHOR("Rui Zhao <ruizhao@microsoft.com>");
+MODULE_AUTHOR("Lei Wang <lewan@microsoft.com>");
+MODULE_AUTHOR("Shiping Ji <shji@microsoft.com>");
+MODULE_DESCRIPTION("DMC-520 ECC driver");
+MODULE_LICENSE("GPL v2");