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, 603 insertions, 0 deletions

diff --git a/drivers/edac/e7xxx_edac.c b/drivers/edac/e7xxx_edac.c
new file mode 100644
index 000000000..497e710fc
--- /dev/null
+++ b/drivers/edac/e7xxx_edac.c
@@ -0,0 +1,603 @@
+/*
+ * Intel e7xxx Memory Controller kernel module
+ * (C) 2003 Linux Networx (http://lnxi.com)
+ * This file may be distributed under the terms of the
+ * GNU General Public License.
+ *
+ * See "enum e7xxx_chips" below for supported chipsets
+ *
+ * Written by Thayne Harbaugh
+ * Based on work by Dan Hollis <goemon at anime dot net> and others.
+ *	http://www.anime.net/~goemon/linux-ecc/
+ *
+ * Datasheet:
+ *	http://www.intel.com/content/www/us/en/chipsets/e7501-chipset-memory-controller-hub-datasheet.html
+ *
+ * Contributors:
+ *	Eric Biederman (Linux Networx)
+ *	Tom Zimmerman (Linux Networx)
+ *	Jim Garlick (Lawrence Livermore National Labs)
+ *	Dave Peterson (Lawrence Livermore National Labs)
+ *	That One Guy (Some other place)
+ *	Wang Zhenyu (intel.com)
+ *
+ * $Id: edac_e7xxx.c,v 1.5.2.9 2005/10/05 00:43:44 dsp_llnl Exp $
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/edac.h>
+#include "edac_module.h"
+
+#define	EDAC_MOD_STR	"e7xxx_edac"
+
+#define e7xxx_printk(level, fmt, arg...) \
+	edac_printk(level, "e7xxx", fmt, ##arg)
+
+#define e7xxx_mc_printk(mci, level, fmt, arg...) \
+	edac_mc_chipset_printk(mci, level, "e7xxx", fmt, ##arg)
+
+#ifndef PCI_DEVICE_ID_INTEL_7205_0
+#define PCI_DEVICE_ID_INTEL_7205_0	0x255d
+#endif				/* PCI_DEVICE_ID_INTEL_7205_0 */
+
+#ifndef PCI_DEVICE_ID_INTEL_7205_1_ERR
+#define PCI_DEVICE_ID_INTEL_7205_1_ERR	0x2551
+#endif				/* PCI_DEVICE_ID_INTEL_7205_1_ERR */
+
+#ifndef PCI_DEVICE_ID_INTEL_7500_0
+#define PCI_DEVICE_ID_INTEL_7500_0	0x2540
+#endif				/* PCI_DEVICE_ID_INTEL_7500_0 */
+
+#ifndef PCI_DEVICE_ID_INTEL_7500_1_ERR
+#define PCI_DEVICE_ID_INTEL_7500_1_ERR	0x2541
+#endif				/* PCI_DEVICE_ID_INTEL_7500_1_ERR */
+
+#ifndef PCI_DEVICE_ID_INTEL_7501_0
+#define PCI_DEVICE_ID_INTEL_7501_0	0x254c
+#endif				/* PCI_DEVICE_ID_INTEL_7501_0 */
+
+#ifndef PCI_DEVICE_ID_INTEL_7501_1_ERR
+#define PCI_DEVICE_ID_INTEL_7501_1_ERR	0x2541
+#endif				/* PCI_DEVICE_ID_INTEL_7501_1_ERR */
+
+#ifndef PCI_DEVICE_ID_INTEL_7505_0
+#define PCI_DEVICE_ID_INTEL_7505_0	0x2550
+#endif				/* PCI_DEVICE_ID_INTEL_7505_0 */
+
+#ifndef PCI_DEVICE_ID_INTEL_7505_1_ERR
+#define PCI_DEVICE_ID_INTEL_7505_1_ERR	0x2551
+#endif				/* PCI_DEVICE_ID_INTEL_7505_1_ERR */
+
+#define E7XXX_NR_CSROWS		8	/* number of csrows */
+#define E7XXX_NR_DIMMS		8	/* 2 channels, 4 dimms/channel */
+
+/* E7XXX register addresses - device 0 function 0 */
+#define E7XXX_DRB		0x60	/* DRAM row boundary register (8b) */
+#define E7XXX_DRA		0x70	/* DRAM row attribute register (8b) */
+					/*
+					 * 31   Device width row 7 0=x8 1=x4
+					 * 27   Device width row 6
+					 * 23   Device width row 5
+					 * 19   Device width row 4
+					 * 15   Device width row 3
+					 * 11   Device width row 2
+					 *  7   Device width row 1
+					 *  3   Device width row 0
+					 */
+#define E7XXX_DRC		0x7C	/* DRAM controller mode reg (32b) */
+					/*
+					 * 22    Number channels 0=1,1=2
+					 * 19:18 DRB Granularity 32/64MB
+					 */
+#define E7XXX_TOLM		0xC4	/* DRAM top of low memory reg (16b) */
+#define E7XXX_REMAPBASE		0xC6	/* DRAM remap base address reg (16b) */
+#define E7XXX_REMAPLIMIT	0xC8	/* DRAM remap limit address reg (16b) */
+
+/* E7XXX register addresses - device 0 function 1 */
+#define E7XXX_DRAM_FERR		0x80	/* DRAM first error register (8b) */
+#define E7XXX_DRAM_NERR		0x82	/* DRAM next error register (8b) */
+#define E7XXX_DRAM_CELOG_ADD	0xA0	/* DRAM first correctable memory */
+					/*     error address register (32b) */
+					/*
+					 * 31:28 Reserved
+					 * 27:6  CE address (4k block 33:12)
+					 *  5:0  Reserved
+					 */
+#define E7XXX_DRAM_UELOG_ADD	0xB0	/* DRAM first uncorrectable memory */
+					/*     error address register (32b) */
+					/*
+					 * 31:28 Reserved
+					 * 27:6  CE address (4k block 33:12)
+					 *  5:0  Reserved
+					 */
+#define E7XXX_DRAM_CELOG_SYNDROME 0xD0	/* DRAM first correctable memory */
+					/*     error syndrome register (16b) */
+
+enum e7xxx_chips {
+	E7500 = 0,
+	E7501,
+	E7505,
+	E7205,
+};
+
+struct e7xxx_pvt {
+	struct pci_dev *bridge_ck;
+	u32 tolm;
+	u32 remapbase;
+	u32 remaplimit;
+	const struct e7xxx_dev_info *dev_info;
+};
+
+struct e7xxx_dev_info {
+	u16 err_dev;
+	const char *ctl_name;
+};
+
+struct e7xxx_error_info {
+	u8 dram_ferr;
+	u8 dram_nerr;
+	u32 dram_celog_add;
+	u16 dram_celog_syndrome;
+	u32 dram_uelog_add;
+};
+
+static struct edac_pci_ctl_info *e7xxx_pci;
+
+static const struct e7xxx_dev_info e7xxx_devs[] = {
+	[E7500] = {
+		.err_dev = PCI_DEVICE_ID_INTEL_7500_1_ERR,
+		.ctl_name = "E7500"},
+	[E7501] = {
+		.err_dev = PCI_DEVICE_ID_INTEL_7501_1_ERR,
+		.ctl_name = "E7501"},
+	[E7505] = {
+		.err_dev = PCI_DEVICE_ID_INTEL_7505_1_ERR,
+		.ctl_name = "E7505"},
+	[E7205] = {
+		.err_dev = PCI_DEVICE_ID_INTEL_7205_1_ERR,
+		.ctl_name = "E7205"},
+};
+
+/* FIXME - is this valid for both SECDED and S4ECD4ED? */
+static inline int e7xxx_find_channel(u16 syndrome)
+{
+	edac_dbg(3, "\n");
+
+	if ((syndrome & 0xff00) == 0)
+		return 0;
+
+	if ((syndrome & 0x00ff) == 0)
+		return 1;
+
+	if ((syndrome & 0xf000) == 0 || (syndrome & 0x0f00) == 0)
+		return 0;
+
+	return 1;
+}
+
+static unsigned long ctl_page_to_phys(struct mem_ctl_info *mci,
+				unsigned long page)
+{
+	u32 remap;
+	struct e7xxx_pvt *pvt = (struct e7xxx_pvt *)mci->pvt_info;
+
+	edac_dbg(3, "\n");
+
+	if ((page < pvt->tolm) ||
+		((page >= 0x100000) && (page < pvt->remapbase)))
+		return page;
+
+	remap = (page - pvt->tolm) + pvt->remapbase;
+
+	if (remap < pvt->remaplimit)
+		return remap;
+
+	e7xxx_printk(KERN_ERR, "Invalid page %lx - out of range\n", page);
+	return pvt->tolm - 1;
+}
+
+static void process_ce(struct mem_ctl_info *mci, struct e7xxx_error_info *info)
+{
+	u32 error_1b, page;
+	u16 syndrome;
+	int row;
+	int channel;
+
+	edac_dbg(3, "\n");
+	/* read the error address */
+	error_1b = info->dram_celog_add;
+	/* FIXME - should use PAGE_SHIFT */
+	page = error_1b >> 6;	/* convert the address to 4k page */
+	/* read the syndrome */
+	syndrome = info->dram_celog_syndrome;
+	/* FIXME - check for -1 */
+	row = edac_mc_find_csrow_by_page(mci, page);
+	/* convert syndrome to channel */
+	channel = e7xxx_find_channel(syndrome);
+	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, page, 0, syndrome,
+			     row, channel, -1, "e7xxx CE", "");
+}
+
+static void process_ce_no_info(struct mem_ctl_info *mci)
+{
+	edac_dbg(3, "\n");
+	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 0, 0, 0, -1, -1, -1,
+			     "e7xxx CE log register overflow", "");
+}
+
+static void process_ue(struct mem_ctl_info *mci, struct e7xxx_error_info *info)
+{
+	u32 error_2b, block_page;
+	int row;
+
+	edac_dbg(3, "\n");
+	/* read the error address */
+	error_2b = info->dram_uelog_add;
+	/* FIXME - should use PAGE_SHIFT */
+	block_page = error_2b >> 6;	/* convert to 4k address */
+	row = edac_mc_find_csrow_by_page(mci, block_page);
+
+	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, block_page, 0, 0,
+			     row, -1, -1, "e7xxx UE", "");
+}
+
+static void process_ue_no_info(struct mem_ctl_info *mci)
+{
+	edac_dbg(3, "\n");
+
+	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0, -1, -1, -1,
+			     "e7xxx UE log register overflow", "");
+}
+
+static void e7xxx_get_error_info(struct mem_ctl_info *mci,
+				 struct e7xxx_error_info *info)
+{
+	struct e7xxx_pvt *pvt;
+
+	pvt = (struct e7xxx_pvt *)mci->pvt_info;
+	pci_read_config_byte(pvt->bridge_ck, E7XXX_DRAM_FERR, &info->dram_ferr);
+	pci_read_config_byte(pvt->bridge_ck, E7XXX_DRAM_NERR, &info->dram_nerr);
+
+	if ((info->dram_ferr & 1) || (info->dram_nerr & 1)) {
+		pci_read_config_dword(pvt->bridge_ck, E7XXX_DRAM_CELOG_ADD,
+				&info->dram_celog_add);
+		pci_read_config_word(pvt->bridge_ck,
+				E7XXX_DRAM_CELOG_SYNDROME,
+				&info->dram_celog_syndrome);
+	}
+
+	if ((info->dram_ferr & 2) || (info->dram_nerr & 2))
+		pci_read_config_dword(pvt->bridge_ck, E7XXX_DRAM_UELOG_ADD,
+				&info->dram_uelog_add);
+
+	if (info->dram_ferr & 3)
+		pci_write_bits8(pvt->bridge_ck, E7XXX_DRAM_FERR, 0x03, 0x03);
+
+	if (info->dram_nerr & 3)
+		pci_write_bits8(pvt->bridge_ck, E7XXX_DRAM_NERR, 0x03, 0x03);
+}
+
+static int e7xxx_process_error_info(struct mem_ctl_info *mci,
+				struct e7xxx_error_info *info,
+				int handle_errors)
+{
+	int error_found;
+
+	error_found = 0;
+
+	/* decode and report errors */
+	if (info->dram_ferr & 1) {	/* check first error correctable */
+		error_found = 1;
+
+		if (handle_errors)
+			process_ce(mci, info);
+	}
+
+	if (info->dram_ferr & 2) {	/* check first error uncorrectable */
+		error_found = 1;
+
+		if (handle_errors)
+			process_ue(mci, info);
+	}
+
+	if (info->dram_nerr & 1) {	/* check next error correctable */
+		error_found = 1;
+
+		if (handle_errors) {
+			if (info->dram_ferr & 1)
+				process_ce_no_info(mci);
+			else
+				process_ce(mci, info);
+		}
+	}
+
+	if (info->dram_nerr & 2) {	/* check next error uncorrectable */
+		error_found = 1;
+
+		if (handle_errors) {
+			if (info->dram_ferr & 2)
+				process_ue_no_info(mci);
+			else
+				process_ue(mci, info);
+		}
+	}
+
+	return error_found;
+}
+
+static void e7xxx_check(struct mem_ctl_info *mci)
+{
+	struct e7xxx_error_info info;
+
+	e7xxx_get_error_info(mci, &info);
+	e7xxx_process_error_info(mci, &info, 1);
+}
+
+/* Return 1 if dual channel mode is active.  Else return 0. */
+static inline int dual_channel_active(u32 drc, int dev_idx)
+{
+	return (dev_idx == E7501) ? ((drc >> 22) & 0x1) : 1;
+}
+
+/* Return DRB granularity (0=32mb, 1=64mb). */
+static inline int drb_granularity(u32 drc, int dev_idx)
+{
+	/* only e7501 can be single channel */
+	return (dev_idx == E7501) ? ((drc >> 18) & 0x3) : 1;
+}
+
+static void e7xxx_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
+			int dev_idx, u32 drc)
+{
+	unsigned long last_cumul_size;
+	int index, j;
+	u8 value;
+	u32 dra, cumul_size, nr_pages;
+	int drc_chan, drc_drbg, drc_ddim, mem_dev;
+	struct csrow_info *csrow;
+	struct dimm_info *dimm;
+	enum edac_type edac_mode;
+
+	pci_read_config_dword(pdev, E7XXX_DRA, &dra);
+	drc_chan = dual_channel_active(drc, dev_idx);
+	drc_drbg = drb_granularity(drc, dev_idx);
+	drc_ddim = (drc >> 20) & 0x3;
+	last_cumul_size = 0;
+
+	/* The dram row boundary (DRB) reg values are boundary address
+	 * for each DRAM row with a granularity of 32 or 64MB (single/dual
+	 * channel operation).  DRB regs are cumulative; therefore DRB7 will
+	 * contain the total memory contained in all eight rows.
+	 */
+	for (index = 0; index < mci->nr_csrows; index++) {
+		/* mem_dev 0=x8, 1=x4 */
+		mem_dev = (dra >> (index * 4 + 3)) & 0x1;
+		csrow = mci->csrows[index];
+
+		pci_read_config_byte(pdev, E7XXX_DRB + index, &value);
+		/* convert a 64 or 32 MiB DRB to a page size. */
+		cumul_size = value << (25 + drc_drbg - PAGE_SHIFT);
+		edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
+		if (cumul_size == last_cumul_size)
+			continue;	/* not populated */
+
+		csrow->first_page = last_cumul_size;
+		csrow->last_page = cumul_size - 1;
+		nr_pages = cumul_size - last_cumul_size;
+		last_cumul_size = cumul_size;
+
+		/*
+		* if single channel or x8 devices then SECDED
+		* if dual channel and x4 then S4ECD4ED
+		*/
+		if (drc_ddim) {
+			if (drc_chan && mem_dev) {
+				edac_mode = EDAC_S4ECD4ED;
+				mci->edac_cap |= EDAC_FLAG_S4ECD4ED;
+			} else {
+				edac_mode = EDAC_SECDED;
+				mci->edac_cap |= EDAC_FLAG_SECDED;
+			}
+		} else
+			edac_mode = EDAC_NONE;
+
+		for (j = 0; j < drc_chan + 1; j++) {
+			dimm = csrow->channels[j]->dimm;
+
+			dimm->nr_pages = nr_pages / (drc_chan + 1);
+			dimm->grain = 1 << 12;	/* 4KiB - resolution of CELOG */
+			dimm->mtype = MEM_RDDR;	/* only one type supported */
+			dimm->dtype = mem_dev ? DEV_X4 : DEV_X8;
+			dimm->edac_mode = edac_mode;
+		}
+	}
+}
+
+static int e7xxx_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	u16 pci_data;
+	struct mem_ctl_info *mci = NULL;
+	struct edac_mc_layer layers[2];
+	struct e7xxx_pvt *pvt = NULL;
+	u32 drc;
+	int drc_chan;
+	struct e7xxx_error_info discard;
+
+	edac_dbg(0, "mci\n");
+
+	pci_read_config_dword(pdev, E7XXX_DRC, &drc);
+
+	drc_chan = dual_channel_active(drc, dev_idx);
+	/*
+	 * According with the datasheet, this device has a maximum of
+	 * 4 DIMMS per channel, either single-rank or dual-rank. So, the
+	 * total amount of dimms is 8 (E7XXX_NR_DIMMS).
+	 * That means that the DIMM is mapped as CSROWs, and the channel
+	 * will map the rank. So, an error to either channel should be
+	 * attributed to the same dimm.
+	 */
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = E7XXX_NR_CSROWS;
+	layers[0].is_virt_csrow = true;
+	layers[1].type = EDAC_MC_LAYER_CHANNEL;
+	layers[1].size = drc_chan + 1;
+	layers[1].is_virt_csrow = false;
+	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
+	if (mci == NULL)
+		return -ENOMEM;
+
+	edac_dbg(3, "init mci\n");
+	mci->mtype_cap = MEM_FLAG_RDDR;
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED |
+		EDAC_FLAG_S4ECD4ED;
+	/* FIXME - what if different memory types are in different csrows? */
+	mci->mod_name = EDAC_MOD_STR;
+	mci->pdev = &pdev->dev;
+	edac_dbg(3, "init pvt\n");
+	pvt = (struct e7xxx_pvt *)mci->pvt_info;
+	pvt->dev_info = &e7xxx_devs[dev_idx];
+	pvt->bridge_ck = pci_get_device(PCI_VENDOR_ID_INTEL,
+					pvt->dev_info->err_dev, pvt->bridge_ck);
+
+	if (!pvt->bridge_ck) {
+		e7xxx_printk(KERN_ERR, "error reporting device not found:"
+			"vendor %x device 0x%x (broken BIOS?)\n",
+			PCI_VENDOR_ID_INTEL, e7xxx_devs[dev_idx].err_dev);
+		goto fail0;
+	}
+
+	edac_dbg(3, "more mci init\n");
+	mci->ctl_name = pvt->dev_info->ctl_name;
+	mci->dev_name = pci_name(pdev);
+	mci->edac_check = e7xxx_check;
+	mci->ctl_page_to_phys = ctl_page_to_phys;
+	e7xxx_init_csrows(mci, pdev, dev_idx, drc);
+	mci->edac_cap |= EDAC_FLAG_NONE;
+	edac_dbg(3, "tolm, remapbase, remaplimit\n");
+	/* load the top of low memory, remap base, and remap limit vars */
+	pci_read_config_word(pdev, E7XXX_TOLM, &pci_data);
+	pvt->tolm = ((u32) pci_data) << 4;
+	pci_read_config_word(pdev, E7XXX_REMAPBASE, &pci_data);
+	pvt->remapbase = ((u32) pci_data) << 14;
+	pci_read_config_word(pdev, E7XXX_REMAPLIMIT, &pci_data);
+	pvt->remaplimit = ((u32) pci_data) << 14;
+	e7xxx_printk(KERN_INFO,
+		"tolm = %x, remapbase = %x, remaplimit = %x\n", pvt->tolm,
+		pvt->remapbase, pvt->remaplimit);
+
+	/* clear any pending errors, or initial state bits */
+	e7xxx_get_error_info(mci, &discard);
+
+	/* Here we assume that we will never see multiple instances of this
+	 * type of memory controller.  The ID is therefore hardcoded to 0.
+	 */
+	if (edac_mc_add_mc(mci)) {
+		edac_dbg(3, "failed edac_mc_add_mc()\n");
+		goto fail1;
+	}
+
+	/* allocating generic PCI control info */
+	e7xxx_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
+	if (!e7xxx_pci) {
+		printk(KERN_WARNING
+			"%s(): Unable to create PCI control\n",
+			__func__);
+		printk(KERN_WARNING
+			"%s(): PCI error report via EDAC not setup\n",
+			__func__);
+	}
+
+	/* get this far and it's successful */
+	edac_dbg(3, "success\n");
+	return 0;
+
+fail1:
+	pci_dev_put(pvt->bridge_ck);
+
+fail0:
+	edac_mc_free(mci);
+
+	return -ENODEV;
+}
+
+/* returns count (>= 0), or negative on error */
+static int e7xxx_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	edac_dbg(0, "\n");
+
+	/* wake up and enable device */
+	return pci_enable_device(pdev) ?
+		-EIO : e7xxx_probe1(pdev, ent->driver_data);
+}
+
+static void e7xxx_remove_one(struct pci_dev *pdev)
+{
+	struct mem_ctl_info *mci;
+	struct e7xxx_pvt *pvt;
+
+	edac_dbg(0, "\n");
+
+	if (e7xxx_pci)
+		edac_pci_release_generic_ctl(e7xxx_pci);
+
+	if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
+		return;
+
+	pvt = (struct e7xxx_pvt *)mci->pvt_info;
+	pci_dev_put(pvt->bridge_ck);
+	edac_mc_free(mci);
+}
+
+static const struct pci_device_id e7xxx_pci_tbl[] = {
+	{
+	 PCI_VEND_DEV(INTEL, 7205_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	 E7205},
+	{
+	 PCI_VEND_DEV(INTEL, 7500_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	 E7500},
+	{
+	 PCI_VEND_DEV(INTEL, 7501_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	 E7501},
+	{
+	 PCI_VEND_DEV(INTEL, 7505_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	 E7505},
+	{
+	 0,
+	 }			/* 0 terminated list. */
+};
+
+MODULE_DEVICE_TABLE(pci, e7xxx_pci_tbl);
+
+static struct pci_driver e7xxx_driver = {
+	.name = EDAC_MOD_STR,
+	.probe = e7xxx_init_one,
+	.remove = e7xxx_remove_one,
+	.id_table = e7xxx_pci_tbl,
+};
+
+static int __init e7xxx_init(void)
+{
+       /* Ensure that the OPSTATE is set correctly for POLL or NMI */
+       opstate_init();
+
+	return pci_register_driver(&e7xxx_driver);
+}
+
+static void __exit e7xxx_exit(void)
+{
+	pci_unregister_driver(&e7xxx_driver);
+}
+
+module_init(e7xxx_init);
+module_exit(e7xxx_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh et al\n"
+		"Based on.work by Dan Hollis et al");
+MODULE_DESCRIPTION("MC support for Intel e7xxx memory controllers");
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");