/* Intel Sandy Bridge -EN/-EP/-EX Memory Controller kernel module
 *
 * This driver supports the memory controllers found on the Intel
 * processor family Sandy Bridge.
 *
 * This file may be distributed under the terms of the
 * GNU General Public License version 2 only.
 *
 * Copyright (c) 2011 by:
 *       Mauro Carvalho Chehab <mchehab@redhat.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/edac.h>
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <linux/bitmap.h>
#include <linux/math64.h>
#include <linux/mod_devicetable.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/processor.h>
#include <asm/mce.h>

#include "edac_core.h"

/* Static vars */
static LIST_HEAD(sbridge_edac_list);

/*
 * Alter this version for the module when modifications are made
 */
#define SBRIDGE_REVISION    " Ver: 1.1.1 "
#define EDAC_MOD_STR      "sbridge_edac"

/*
 * Debug macros
 */
#define sbridge_printk(level, fmt, arg...)                      \
        edac_printk(level, "sbridge", fmt, ##arg)

#define sbridge_mc_printk(mci, level, fmt, arg...)              \
        edac_mc_chipset_printk(mci, level, "sbridge", fmt, ##arg)

/*
 * Get a bit field at register value <v>, from bit <lo> to bit <hi>
 */
#define GET_BITFIELD(v, lo, hi) \
        (((v) & GENMASK_ULL(hi, lo)) >> (lo))

/* Devices 12 Function 6, Offsets 0x80 to 0xcc */
static const u32 sbridge_dram_rule[] = {
        0x80, 0x88, 0x90, 0x98, 0xa0,
        0xa8, 0xb0, 0xb8, 0xc0, 0xc8,
};

static const u32 ibridge_dram_rule[] = {
        0x60, 0x68, 0x70, 0x78, 0x80,
        0x88, 0x90, 0x98, 0xa0, 0xa8,
        0xb0, 0xb8, 0xc0, 0xc8, 0xd0,
        0xd8, 0xe0, 0xe8, 0xf0, 0xf8,
};

static const u32 knl_dram_rule[] = {
        0x60, 0x68, 0x70, 0x78, 0x80, /* 0-4 */
        0x88, 0x90, 0x98, 0xa0, 0xa8, /* 5-9 */
        0xb0, 0xb8, 0xc0, 0xc8, 0xd0, /* 10-14 */
        0xd8, 0xe0, 0xe8, 0xf0, 0xf8, /* 15-19 */
        0x100, 0x108, 0x110, 0x118,   /* 20-23 */
};

#define DRAM_RULE_ENABLE(reg)   GET_BITFIELD(reg, 0,  0)
#define A7MODE(reg)             GET_BITFIELD(reg, 26, 26)

static char *show_dram_attr(u32 attr)
{
        switch (attr) {
                case 0:
                        return "DRAM";
                case 1:
                        return "MMCFG";
                case 2:
                        return "NXM";
                default:
                        return "unknown";
        }
}

static const u32 sbridge_interleave_list[] = {
        0x84, 0x8c, 0x94, 0x9c, 0xa4,
        0xac, 0xb4, 0xbc, 0xc4, 0xcc,
};

static const u32 ibridge_interleave_list[] = {
        0x64, 0x6c, 0x74, 0x7c, 0x84,
        0x8c, 0x94, 0x9c, 0xa4, 0xac,
        0xb4, 0xbc, 0xc4, 0xcc, 0xd4,
        0xdc, 0xe4, 0xec, 0xf4, 0xfc,
};

static const u32 knl_interleave_list[] = {
        0x64, 0x6c, 0x74, 0x7c, 0x84, /* 0-4 */
        0x8c, 0x94, 0x9c, 0xa4, 0xac, /* 5-9 */
        0xb4, 0xbc, 0xc4, 0xcc, 0xd4, /* 10-14 */
        0xdc, 0xe4, 0xec, 0xf4, 0xfc, /* 15-19 */
        0x104, 0x10c, 0x114, 0x11c,   /* 20-23 */
};

struct interleave_pkg {
        unsigned char start;
        unsigned char end;
};

static const struct interleave_pkg sbridge_interleave_pkg[] = {
        { 0, 2 },
        { 3, 5 },
        { 8, 10 },
        { 11, 13 },
        { 16, 18 },
        { 19, 21 },
        { 24, 26 },
        { 27, 29 },
};

static const struct interleave_pkg ibridge_interleave_pkg[] = {
        { 0, 3 },
        { 4, 7 },
        { 8, 11 },
        { 12, 15 },
        { 16, 19 },
        { 20, 23 },
        { 24, 27 },
        { 28, 31 },
};

static inline int sad_pkg(const struct interleave_pkg *table, u32 reg,
                          int interleave)
{
        return GET_BITFIELD(reg, table[interleave].start,
                            table[interleave].end);
}

/* Devices 12 Function 7 */

#define TOLM            0x80
#define TOHM            0x84
#define HASWELL_TOLM    0xd0
#define HASWELL_TOHM_0  0xd4
#define HASWELL_TOHM_1  0xd8
#define KNL_TOLM        0xd0
#define KNL_TOHM_0      0xd4
#define KNL_TOHM_1      0xd8

#define GET_TOLM(reg)           ((GET_BITFIELD(reg, 0,  3) << 28) | 0x3ffffff)
#define GET_TOHM(reg)           ((GET_BITFIELD(reg, 0, 20) << 25) | 0x3ffffff)

/* Device 13 Function 6 */

#define SAD_TARGET      0xf0

#define SOURCE_ID(reg)          GET_BITFIELD(reg, 9, 11)

#define SOURCE_ID_KNL(reg)      GET_BITFIELD(reg, 12, 14)

#define SAD_CONTROL     0xf4

/* Device 14 function 0 */

static const u32 tad_dram_rule[] = {
        0x40, 0x44, 0x48, 0x4c,
        0x50, 0x54, 0x58, 0x5c,
        0x60, 0x64, 0x68, 0x6c,
};
#define MAX_TAD ARRAY_SIZE(tad_dram_rule)

#define TAD_LIMIT(reg)          ((GET_BITFIELD(reg, 12, 31) << 26) | 0x3ffffff)
#define TAD_SOCK(reg)           GET_BITFIELD(reg, 10, 11)
#define TAD_CH(reg)             GET_BITFIELD(reg,  8,  9)
#define TAD_TGT3(reg)           GET_BITFIELD(reg,  6,  7)
#define TAD_TGT2(reg)           GET_BITFIELD(reg,  4,  5)
#define TAD_TGT1(reg)           GET_BITFIELD(reg,  2,  3)
#define TAD_TGT0(reg)           GET_BITFIELD(reg,  0,  1)

/* Device 15, function 0 */

#define MCMTR                   0x7c
#define KNL_MCMTR               0x624

#define IS_ECC_ENABLED(mcmtr)           GET_BITFIELD(mcmtr, 2, 2)
#define IS_LOCKSTEP_ENABLED(mcmtr)      GET_BITFIELD(mcmtr, 1, 1)
#define IS_CLOSE_PG(mcmtr)              GET_BITFIELD(mcmtr, 0, 0)

/* Device 15, function 1 */

#define RASENABLES              0xac
#define IS_MIRROR_ENABLED(reg)          GET_BITFIELD(reg, 0, 0)

/* Device 15, functions 2-5 */

static const int mtr_regs[] = {
        0x80, 0x84, 0x88,
};

static const int knl_mtr_reg = 0xb60;

#define RANK_DISABLE(mtr)               GET_BITFIELD(mtr, 16, 19)
#define IS_DIMM_PRESENT(mtr)            GET_BITFIELD(mtr, 14, 14)
#define RANK_CNT_BITS(mtr)              GET_BITFIELD(mtr, 12, 13)
#define RANK_WIDTH_BITS(mtr)            GET_BITFIELD(mtr, 2, 4)
#define COL_WIDTH_BITS(mtr)             GET_BITFIELD(mtr, 0, 1)

static const u32 tad_ch_nilv_offset[] = {
        0x90, 0x94, 0x98, 0x9c,
        0xa0, 0xa4, 0xa8, 0xac,
        0xb0, 0xb4, 0xb8, 0xbc,
};
#define CHN_IDX_OFFSET(reg)             GET_BITFIELD(reg, 28, 29)
#define TAD_OFFSET(reg)                 (GET_BITFIELD(reg,  6, 25) << 26)

static const u32 rir_way_limit[] = {
        0x108, 0x10c, 0x110, 0x114, 0x118,
};
#define MAX_RIR_RANGES ARRAY_SIZE(rir_way_limit)

#define IS_RIR_VALID(reg)       GET_BITFIELD(reg, 31, 31)
#define RIR_WAY(reg)            GET_BITFIELD(reg, 28, 29)

#define MAX_RIR_WAY     8

static const u32 rir_offset[MAX_RIR_RANGES][MAX_RIR_WAY] = {
        { 0x120, 0x124, 0x128, 0x12c, 0x130, 0x134, 0x138, 0x13c },
        { 0x140, 0x144, 0x148, 0x14c, 0x150, 0x154, 0x158, 0x15c },
        { 0x160, 0x164, 0x168, 0x16c, 0x170, 0x174, 0x178, 0x17c },
        { 0x180, 0x184, 0x188, 0x18c, 0x190, 0x194, 0x198, 0x19c },
        { 0x1a0, 0x1a4, 0x1a8, 0x1ac, 0x1b0, 0x1b4, 0x1b8, 0x1bc },
};

#define RIR_RNK_TGT(type, reg) (((type) == BROADWELL) ? \
        GET_BITFIELD(reg, 20, 23) : GET_BITFIELD(reg, 16, 19))

#define RIR_OFFSET(type, reg) (((type) == HASWELL || (type) == BROADWELL) ? \
        GET_BITFIELD(reg,  2, 15) : GET_BITFIELD(reg,  2, 14))

/* Device 16, functions 2-7 */

/*
 * FIXME: Implement the error count reads directly
 */

static const u32 correrrcnt[] = {
        0x104, 0x108, 0x10c, 0x110,
};

#define RANK_ODD_OV(reg)                GET_BITFIELD(reg, 31, 31)
#define RANK_ODD_ERR_CNT(reg)           GET_BITFIELD(reg, 16, 30)
#define RANK_EVEN_OV(reg)               GET_BITFIELD(reg, 15, 15)
#define RANK_EVEN_ERR_CNT(reg)          GET_BITFIELD(reg,  0, 14)

static const u32 correrrthrsld[] = {
        0x11c, 0x120, 0x124, 0x128,
};

#define RANK_ODD_ERR_THRSLD(reg)        GET_BITFIELD(reg, 16, 30)
#define RANK_EVEN_ERR_THRSLD(reg)       GET_BITFIELD(reg,  0, 14)


/* Device 17, function 0 */

#define SB_RANK_CFG_A           0x0328

#define IB_RANK_CFG_A           0x0320

/*
 * sbridge structs
 */

#define NUM_CHANNELS            8       /* 2MC per socket, four chan per MC */
#define MAX_DIMMS               3       /* Max DIMMS per channel */
#define KNL_MAX_CHAS            38      /* KNL max num. of Cache Home Agents */
#define KNL_MAX_CHANNELS        6       /* KNL max num. of PCI channels */
#define KNL_MAX_EDCS            8       /* Embedded DRAM controllers */
#define CHANNEL_UNSPECIFIED     0xf     /* Intel IA32 SDM 15-14 */

enum type {
        SANDY_BRIDGE,
        IVY_BRIDGE,
        HASWELL,
        BROADWELL,
        KNIGHTS_LANDING,
};

struct sbridge_pvt;
struct sbridge_info {
        enum type       type;
        u32             mcmtr;
        u32             rankcfgr;
        u64             (*get_tolm)(struct sbridge_pvt *pvt);
        u64             (*get_tohm)(struct sbridge_pvt *pvt);
        u64             (*rir_limit)(u32 reg);
        u64             (*sad_limit)(u32 reg);
        u32             (*interleave_mode)(u32 reg);
        char*           (*show_interleave_mode)(u32 reg);
        u32             (*dram_attr)(u32 reg);
        const u32       *dram_rule;
        const u32       *interleave_list;
        const struct interleave_pkg *interleave_pkg;
        u8              max_sad;
        u8              max_interleave;
        u8              (*get_node_id)(struct sbridge_pvt *pvt);
        enum mem_type   (*get_memory_type)(struct sbridge_pvt *pvt);
        enum dev_type   (*get_width)(struct sbridge_pvt *pvt, u32 mtr);
        struct pci_dev  *pci_vtd;
};

struct sbridge_channel {
        u32             ranks;
        u32             dimms;
};

struct pci_id_descr {
        int                     dev_id;
        int                     optional;
};

struct pci_id_table {
        const struct pci_id_descr       *descr;
        int                             n_devs;
        enum type                       type;
};

struct sbridge_dev {
        struct list_head        list;
        u8                      bus, mc;
        u8                      node_id, source_id;
        struct pci_dev          **pdev;
        int                     n_devs;
        struct mem_ctl_info     *mci;
};

struct knl_pvt {
        struct pci_dev          *pci_cha[KNL_MAX_CHAS];
        struct pci_dev          *pci_channel[KNL_MAX_CHANNELS];
        struct pci_dev          *pci_mc0;
        struct pci_dev          *pci_mc1;
        struct pci_dev          *pci_mc0_misc;
        struct pci_dev          *pci_mc1_misc;
        struct pci_dev          *pci_mc_info; /* tolm, tohm */
};

struct sbridge_pvt {
        struct pci_dev          *pci_ta, *pci_ddrio, *pci_ras;
        struct pci_dev          *pci_sad0, *pci_sad1;
        struct pci_dev          *pci_ha0, *pci_ha1;
        struct pci_dev          *pci_br0, *pci_br1;
        struct pci_dev          *pci_ha1_ta;
        struct pci_dev          *pci_tad[NUM_CHANNELS];

        struct sbridge_dev      *sbridge_dev;

        struct sbridge_info     info;
        struct sbridge_channel  channel[NUM_CHANNELS];

        /* Memory type detection */
        bool                    is_mirrored, is_lockstep, is_close_pg;
        bool                    is_chan_hash;

        /* Fifo double buffers */
        struct mce              mce_entry[MCE_LOG_LEN];
        struct mce              mce_outentry[MCE_LOG_LEN];

        /* Fifo in/out counters */
        unsigned                mce_in, mce_out;

        /* Count indicator to show errors not got */
        unsigned                mce_overrun;

        /* Memory description */
        u64                     tolm, tohm;
        struct knl_pvt knl;
};

#define PCI_DESCR(device_id, opt)       \
        .dev_id = (device_id),          \
        .optional = opt

static const struct pci_id_descr pci_dev_descr_sbridge[] = {
                /* Processor Home Agent */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0, 0)     },

                /* Memory controller */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA, 0)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_RAS, 0)     },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0, 0)    },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD1, 0)    },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD2, 0)    },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD3, 0)    },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO, 1)   },

                /* System Address Decoder */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_SAD0, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_SAD1, 0)        },

                /* Broadcast Registers */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_SBRIDGE_BR, 0)          },
};

#define PCI_ID_TABLE_ENTRY(A, T) {      \
        .descr = A,                     \
        .n_devs = ARRAY_SIZE(A),        \
        .type = T                       \
}

static const struct pci_id_table pci_dev_descr_sbridge_table[] = {
        PCI_ID_TABLE_ENTRY(pci_dev_descr_sbridge, SANDY_BRIDGE),
        {0,}                    /* 0 terminated list. */
};

/* This changes depending if 1HA or 2HA:
 * 1HA:
 *      0x0eb8 (17.0) is DDRIO0
 * 2HA:
 *      0x0ebc (17.4) is DDRIO0
 */
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_1HA_DDRIO0      0x0eb8
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_2HA_DDRIO0      0x0ebc

/* pci ids */
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0             0x0ea0
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA          0x0ea8
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_RAS         0x0e71
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD0        0x0eaa
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD1        0x0eab
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD2        0x0eac
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD3        0x0ead
#define PCI_DEVICE_ID_INTEL_IBRIDGE_SAD                 0x0ec8
#define PCI_DEVICE_ID_INTEL_IBRIDGE_BR0                 0x0ec9
#define PCI_DEVICE_ID_INTEL_IBRIDGE_BR1                 0x0eca
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1             0x0e60
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TA          0x0e68
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_RAS         0x0e79
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD0        0x0e6a
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD1        0x0e6b
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD2        0x0e6c
#define PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD3        0x0e6d

static const struct pci_id_descr pci_dev_descr_ibridge[] = {
                /* Processor Home Agent */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0, 0)             },

                /* Memory controller */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA, 0)          },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_RAS, 0)         },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD0, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD1, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD2, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD3, 0)        },

                /* System Address Decoder */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_SAD, 0)                 },

                /* Broadcast Registers */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_BR0, 1)                 },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_BR1, 0)                 },

                /* Optional, mode 2HA */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1, 1)             },
#if 0
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TA, 1)  },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_RAS, 1) },
#endif
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD0, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD1, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD2, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD3, 1)        },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_1HA_DDRIO0, 1)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_2HA_DDRIO0, 1)      },
};

static const struct pci_id_table pci_dev_descr_ibridge_table[] = {
        PCI_ID_TABLE_ENTRY(pci_dev_descr_ibridge, IVY_BRIDGE),
        {0,}                    /* 0 terminated list. */
};

/* Haswell support */
/* EN processor:
 *      - 1 IMC
 *      - 3 DDR3 channels, 2 DPC per channel
 * EP processor:
 *      - 1 or 2 IMC
 *      - 4 DDR4 channels, 3 DPC per channel
 * EP 4S processor:
 *      - 2 IMC
 *      - 4 DDR4 channels, 3 DPC per channel
 * EX processor:
 *      - 2 IMC
 *      - each IMC interfaces with a SMI 2 channel
 *      - each SMI channel interfaces with a scalable memory buffer
 *      - each scalable memory buffer supports 4 DDR3/DDR4 channels, 3 DPC
 */
#define HASWELL_DDRCRCLKCONTROLS 0xa10 /* Ditto on Broadwell */
#define HASWELL_HASYSDEFEATURE2 0x84
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_VTD_MISC 0x2f28
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0     0x2fa0
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1     0x2f60
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TA  0x2fa8
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_THERMAL 0x2f71
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TA  0x2f68
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_THERMAL 0x2f79
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_CBO_SAD0 0x2ffc
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_CBO_SAD1 0x2ffd
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD0 0x2faa
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD1 0x2fab
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD2 0x2fac
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD3 0x2fad
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD0 0x2f6a
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD1 0x2f6b
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD2 0x2f6c
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD3 0x2f6d
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO0 0x2fbd
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO1 0x2fbf
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO2 0x2fb9
#define PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO3 0x2fbb
static const struct pci_id_descr pci_dev_descr_haswell[] = {
        /* first item must be the HA */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0, 0)             },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_CBO_SAD0, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_CBO_SAD1, 0)        },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1, 1)             },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TA, 0)          },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_THERMAL, 0)     },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD0, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD1, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD2, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD3, 1)        },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO0, 1)          },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO1, 1)          },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO2, 1)          },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO3, 1)          },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TA, 1)          },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_THERMAL, 1)     },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD0, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD1, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD2, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD3, 1)        },
};

static const struct pci_id_table pci_dev_descr_haswell_table[] = {
        PCI_ID_TABLE_ENTRY(pci_dev_descr_haswell, HASWELL),
        {0,}                    /* 0 terminated list. */
};

/* Knight's Landing Support */
/*
 * KNL's memory channels are swizzled between memory controllers.
 * MC0 is mapped to CH3,4,5 and MC1 is mapped to CH0,1,2
 */
#define knl_channel_remap(mc, chan) ((mc) ? (chan) : (chan) + 3)

/* Memory controller, TAD tables, error injection - 2-8-0, 2-9-0 (2 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_MC       0x7840
/* DRAM channel stuff; bank addrs, dimmmtr, etc.. 2-8-2 - 2-9-4 (6 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_CHANNEL  0x7843
/* kdrwdbu TAD limits/offsets, MCMTR - 2-10-1, 2-11-1 (2 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_TA       0x7844
/* CHA broadcast registers, dram rules - 1-29-0 (1 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_SAD0     0x782a
/* SAD target - 1-29-1 (1 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_SAD1     0x782b
/* Caching / Home Agent */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_CHA      0x782c
/* Device with TOLM and TOHM, 0-5-0 (1 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_TOLHM    0x7810

/*
 * KNL differs from SB, IB, and Haswell in that it has multiple
 * instances of the same device with the same device ID, so we handle that
 * by creating as many copies in the table as we expect to find.
 * (Like device ID must be grouped together.)
 */

static const struct pci_id_descr pci_dev_descr_knl[] = {
        [0]         = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_SAD0, 0) },
        [1]         = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_SAD1, 0) },
        [2 ... 3]   = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_MC, 0)},
        [4 ... 41]  = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_CHA, 0) },
        [42 ... 47] = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_CHANNEL, 0) },
        [48]        = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_TA, 0) },
        [49]        = { PCI_DESCR(PCI_DEVICE_ID_INTEL_KNL_IMC_TOLHM, 0) },
};

static const struct pci_id_table pci_dev_descr_knl_table[] = {
        PCI_ID_TABLE_ENTRY(pci_dev_descr_knl, KNIGHTS_LANDING),
        {0,}
};

/*
 * Broadwell support
 *
 * DE processor:
 *      - 1 IMC
 *      - 2 DDR3 channels, 2 DPC per channel
 * EP processor:
 *      - 1 or 2 IMC
 *      - 4 DDR4 channels, 3 DPC per channel
 * EP 4S processor:
 *      - 2 IMC
 *      - 4 DDR4 channels, 3 DPC per channel
 * EX processor:
 *      - 2 IMC
 *      - each IMC interfaces with a SMI 2 channel
 *      - each SMI channel interfaces with a scalable memory buffer
 *      - each scalable memory buffer supports 4 DDR3/DDR4 channels, 3 DPC
 */
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_VTD_MISC 0x6f28
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0   0x6fa0
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1   0x6f60
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TA        0x6fa8
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_THERMAL 0x6f71
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TA        0x6f68
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_THERMAL 0x6f79
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_CBO_SAD0 0x6ffc
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_CBO_SAD1 0x6ffd
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD0 0x6faa
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD1 0x6fab
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD2 0x6fac
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD3 0x6fad
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD0 0x6f6a
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD1 0x6f6b
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD2 0x6f6c
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD3 0x6f6d
#define PCI_DEVICE_ID_INTEL_BROADWELL_IMC_DDRIO0 0x6faf

static const struct pci_id_descr pci_dev_descr_broadwell[] = {
        /* first item must be the HA */
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0, 0)           },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_CBO_SAD0, 0)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_CBO_SAD1, 0)      },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1, 1)           },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TA, 0)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_THERMAL, 0)   },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD0, 0)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD1, 0)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD2, 1)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD3, 1)      },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_DDRIO0, 1)        },

        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TA, 1)        },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_THERMAL, 1)   },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD0, 1)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD1, 1)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD2, 1)      },
        { PCI_DESCR(PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD3, 1)      },
};

static const struct pci_id_table pci_dev_descr_broadwell_table[] = {
        PCI_ID_TABLE_ENTRY(pci_dev_descr_broadwell, BROADWELL),
        {0,}                    /* 0 terminated list. */
};


/****************************************************************************
                        Ancillary status routines
 ****************************************************************************/

static inline int numrank(enum type type, u32 mtr)
{
        int ranks = (1 << RANK_CNT_BITS(mtr));
        int max = 4;

        if (type == HASWELL || type == BROADWELL || type == KNIGHTS_LANDING)
                max = 8;

        if (ranks > max) {
                edac_dbg(0, "Invalid number of ranks: %d (max = %i) raw value = %x (%04x)\n",
                         ranks, max, (unsigned int)RANK_CNT_BITS(mtr), mtr);
                return -EINVAL;
        }

        return ranks;
}

static inline int numrow(u32 mtr)
{
        int rows = (RANK_WIDTH_BITS(mtr) + 12);

        if (rows < 13 || rows > 18) {
                edac_dbg(0, "Invalid number of rows: %d (should be between 14 and 17) raw value = %x (%04x)\n",
                         rows, (unsigned int)RANK_WIDTH_BITS(mtr), mtr);
                return -EINVAL;
        }

        return 1 << rows;
}

static inline int numcol(u32 mtr)
{
        int cols = (COL_WIDTH_BITS(mtr) + 10);

        if (cols > 12) {
                edac_dbg(0, "Invalid number of cols: %d (max = 4) raw value = %x (%04x)\n",
                         cols, (unsigned int)COL_WIDTH_BITS(mtr), mtr);
                return -EINVAL;
        }

        return 1 << cols;
}

static struct sbridge_dev *get_sbridge_dev(u8 bus, int multi_bus)
{
        struct sbridge_dev *sbridge_dev;

        /*
         * If we have devices scattered across several busses that pertain
         * to the same memory controller, we'll lump them all together.
         */
        if (multi_bus) {
                return list_first_entry_or_null(&sbridge_edac_list,
                                struct sbridge_dev, list);
        }

        list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
                if (sbridge_dev->bus == bus)
                        return sbridge_dev;
        }

        return NULL;
}

static struct sbridge_dev *alloc_sbridge_dev(u8 bus,
                                           const struct pci_id_table *table)
{
        struct sbridge_dev *sbridge_dev;

        sbridge_dev = kzalloc(sizeof(*sbridge_dev), GFP_KERNEL);
        if (!sbridge_dev)
                return NULL;

        sbridge_dev->pdev = kzalloc(sizeof(*sbridge_dev->pdev) * table->n_devs,
                                   GFP_KERNEL);
        if (!sbridge_dev->pdev) {
                kfree(sbridge_dev);
                return NULL;
        }

        sbridge_dev->bus = bus;
        sbridge_dev->n_devs = table->n_devs;
        list_add_tail(&sbridge_dev->list, &sbridge_edac_list);

        return sbridge_dev;
}

static void free_sbridge_dev(struct sbridge_dev *sbridge_dev)
{
        list_del(&sbridge_dev->list);
        kfree(sbridge_dev->pdev);
        kfree(sbridge_dev);
}

static u64 sbridge_get_tolm(struct sbridge_pvt *pvt)
{
        u32 reg;

        /* Address range is 32:28 */
        pci_read_config_dword(pvt->pci_sad1, TOLM, &reg);
        return GET_TOLM(reg);
}

static u64 sbridge_get_tohm(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->pci_sad1, TOHM, &reg);
        return GET_TOHM(reg);
}

static u64 ibridge_get_tolm(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->pci_br1, TOLM, &reg);

        return GET_TOLM(reg);
}

static u64 ibridge_get_tohm(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->pci_br1, TOHM, &reg);

        return GET_TOHM(reg);
}

static u64 rir_limit(u32 reg)
{
        return ((u64)GET_BITFIELD(reg,  1, 10) << 29) | 0x1fffffff;
}

static u64 sad_limit(u32 reg)
{
        return (GET_BITFIELD(reg, 6, 25) << 26) | 0x3ffffff;
}

static u32 interleave_mode(u32 reg)
{
        return GET_BITFIELD(reg, 1, 1);
}

char *show_interleave_mode(u32 reg)
{
        return interleave_mode(reg) ? "8:6" : "[8:6]XOR[18:16]";
}

static u32 dram_attr(u32 reg)
{
        return GET_BITFIELD(reg, 2, 3);
}

static u64 knl_sad_limit(u32 reg)
{
        return (GET_BITFIELD(reg, 7, 26) << 26) | 0x3ffffff;
}

static u32 knl_interleave_mode(u32 reg)
{
        return GET_BITFIELD(reg, 1, 2);
}

static char *knl_show_interleave_mode(u32 reg)
{
        char *s;

        switch (knl_interleave_mode(reg)) {
        case 0:
                s = "use address bits [8:6]";
                break;
        case 1:
                s = "use address bits [10:8]";
                break;
        case 2:
                s = "use address bits [14:12]";
                break;
        case 3:
                s = "use address bits [32:30]";
                break;
        default:
                WARN_ON(1);
                break;
        }

        return s;
}

static u32 dram_attr_knl(u32 reg)
{
        return GET_BITFIELD(reg, 3, 4);
}


static enum mem_type get_memory_type(struct sbridge_pvt *pvt)
{
        u32 reg;
        enum mem_type mtype;

        if (pvt->pci_ddrio) {
                pci_read_config_dword(pvt->pci_ddrio, pvt->info.rankcfgr,
                                      &reg);
                if (GET_BITFIELD(reg, 11, 11))
                        /* FIXME: Can also be LRDIMM */
                        mtype = MEM_RDDR3;
                else
                        mtype = MEM_DDR3;
        } else
                mtype = MEM_UNKNOWN;

        return mtype;
}

static enum mem_type haswell_get_memory_type(struct sbridge_pvt *pvt)
{
        u32 reg;
        bool registered = false;
        enum mem_type mtype = MEM_UNKNOWN;

        if (!pvt->pci_ddrio)
                goto out;

        pci_read_config_dword(pvt->pci_ddrio,
                              HASWELL_DDRCRCLKCONTROLS, &reg);
        /* Is_Rdimm */
        if (GET_BITFIELD(reg, 16, 16))
                registered = true;

        pci_read_config_dword(pvt->pci_ta, MCMTR, &reg);
        if (GET_BITFIELD(reg, 14, 14)) {
                if (registered)
                        mtype = MEM_RDDR4;
                else
                        mtype = MEM_DDR4;
        } else {
                if (registered)
                        mtype = MEM_RDDR3;
                else
                        mtype = MEM_DDR3;
        }

out:
        return mtype;
}

static enum dev_type knl_get_width(struct sbridge_pvt *pvt, u32 mtr)
{
        /* for KNL value is fixed */
        return DEV_X16;
}

static enum dev_type sbridge_get_width(struct sbridge_pvt *pvt, u32 mtr)
{
        /* there's no way to figure out */
        return DEV_UNKNOWN;
}

static enum dev_type __ibridge_get_width(u32 mtr)
{
        enum dev_type type;

        switch (mtr) {
        case 3:
                type = DEV_UNKNOWN;
                break;
        case 2:
                type = DEV_X16;
                break;
        case 1:
                type = DEV_X8;
                break;
        case 0:
                type = DEV_X4;
                break;
        }

        return type;
}

static enum dev_type ibridge_get_width(struct sbridge_pvt *pvt, u32 mtr)
{
        /*
         * ddr3_width on the documentation but also valid for DDR4 on
         * Haswell
         */
        return __ibridge_get_width(GET_BITFIELD(mtr, 7, 8));
}

static enum dev_type broadwell_get_width(struct sbridge_pvt *pvt, u32 mtr)
{
        /* ddr3_width on the documentation but also valid for DDR4 */
        return __ibridge_get_width(GET_BITFIELD(mtr, 8, 9));
}

static enum mem_type knl_get_memory_type(struct sbridge_pvt *pvt)
{
        /* DDR4 RDIMMS and LRDIMMS are supported */
        return MEM_RDDR4;
}

static u8 get_node_id(struct sbridge_pvt *pvt)
{
        u32 reg;
        pci_read_config_dword(pvt->pci_br0, SAD_CONTROL, &reg);
        return GET_BITFIELD(reg, 0, 2);
}

static u8 haswell_get_node_id(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->pci_sad1, SAD_CONTROL, &reg);
        return GET_BITFIELD(reg, 0, 3);
}

static u8 knl_get_node_id(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->pci_sad1, SAD_CONTROL, &reg);

        return GET_BITFIELD(reg, 0, 2);
}


static u64 haswell_get_tolm(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->info.pci_vtd, HASWELL_TOLM, &reg);
        return (GET_BITFIELD(reg, 26, 31) << 26) | 0x3ffffff;
}

static u64 haswell_get_tohm(struct sbridge_pvt *pvt)
{
        u64 rc;
        u32 reg;

        pci_read_config_dword(pvt->info.pci_vtd, HASWELL_TOHM_0, &reg);
        rc = GET_BITFIELD(reg, 26, 31);
        pci_read_config_dword(pvt->info.pci_vtd, HASWELL_TOHM_1, &reg);
        rc = ((reg << 6) | rc) << 26;

        return rc | 0x1ffffff;
}

static u64 knl_get_tolm(struct sbridge_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->knl.pci_mc_info, KNL_TOLM, &reg);
        return (GET_BITFIELD(reg, 26, 31) << 26) | 0x3ffffff;
}

static u64 knl_get_tohm(struct sbridge_pvt *pvt)
{
        u64 rc;
        u32 reg_lo, reg_hi;

        pci_read_config_dword(pvt->knl.pci_mc_info, KNL_TOHM_0, &reg_lo);
        pci_read_config_dword(pvt->knl.pci_mc_info, KNL_TOHM_1, &reg_hi);
        rc = ((u64)reg_hi << 32) | reg_lo;
        return rc | 0x3ffffff;
}


static u64 haswell_rir_limit(u32 reg)
{
        return (((u64)GET_BITFIELD(reg,  1, 11) + 1) << 29) - 1;
}

static inline u8 sad_pkg_socket(u8 pkg)
{
        /* on Ivy Bridge, nodeID is SASS, where A is HA and S is node id */
        return ((pkg >> 3) << 2) | (pkg & 0x3);
}

static inline u8 sad_pkg_ha(u8 pkg)
{
        return (pkg >> 2) & 0x1;
}

static int haswell_chan_hash(int idx, u64 addr)
{
        int i;

        /*
         * XOR even bits from 12:26 to bit0 of idx,
         *     odd bits from 13:27 to bit1
         */
        for (i = 12; i < 28; i += 2)
                idx ^= (addr >> i) & 3;

        return idx;
}

/****************************************************************************
                        Memory check routines
 ****************************************************************************/
static struct pci_dev *get_pdev_same_bus(u8 bus, u32 id)
{
        struct pci_dev *pdev = NULL;

        do {
                pdev = pci_get_device(PCI_VENDOR_ID_INTEL, id, pdev);
                if (pdev && pdev->bus->number == bus)
                        break;
        } while (pdev);

        return pdev;
}

/**
 * check_if_ecc_is_active() - Checks if ECC is active
 * @bus:        Device bus
 * @type:       Memory controller type
 * returns: 0 in case ECC is active, -ENODEV if it can't be determined or
 *          disabled
 */
static int check_if_ecc_is_active(const u8 bus, enum type type)
{
        struct pci_dev *pdev = NULL;
        u32 mcmtr, id;

        switch (type) {
        case IVY_BRIDGE:
                id = PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA;
                break;
        case HASWELL:
                id = PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TA;
                break;
        case SANDY_BRIDGE:
                id = PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA;
                break;
        case BROADWELL:
                id = PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TA;
                break;
        case KNIGHTS_LANDING:
                /*
                 * KNL doesn't group things by bus the same way
                 * SB/IB/Haswell does.
                 */
                id = PCI_DEVICE_ID_INTEL_KNL_IMC_TA;
                break;
        default:
                return -ENODEV;
        }

        if (type != KNIGHTS_LANDING)
                pdev = get_pdev_same_bus(bus, id);
        else
                pdev = pci_get_device(PCI_VENDOR_ID_INTEL, id, 0);

        if (!pdev) {
                sbridge_printk(KERN_ERR, "Couldn't find PCI device "
                                        "%04x:%04x! on bus %02d\n",
                                        PCI_VENDOR_ID_INTEL, id, bus);
                return -ENODEV;
        }

        pci_read_config_dword(pdev,
                        type == KNIGHTS_LANDING ? KNL_MCMTR : MCMTR, &mcmtr);
        if (!IS_ECC_ENABLED(mcmtr)) {
                sbridge_printk(KERN_ERR, "ECC is disabled. Aborting\n");
                return -ENODEV;
        }
        return 0;
}

/* Low bits of TAD limit, and some metadata. */
static const u32 knl_tad_dram_limit_lo[] = {
        0x400, 0x500, 0x600, 0x700,
        0x800, 0x900, 0xa00, 0xb00,
};

/* Low bits of TAD offset. */
static const u32 knl_tad_dram_offset_lo[] = {
        0x404, 0x504, 0x604, 0x704,
        0x804, 0x904, 0xa04, 0xb04,
};

/* High 16 bits of TAD limit and offset. */
static const u32 knl_tad_dram_hi[] = {
        0x408, 0x508, 0x608, 0x708,
        0x808, 0x908, 0xa08, 0xb08,
};

/* Number of ways a tad entry is interleaved. */
static const u32 knl_tad_ways[] = {
        8, 6, 4, 3, 2, 1,
};

/*
 * Retrieve the n'th Target Address Decode table entry
 * from the memory controller's TAD table.
 *
 * @pvt:        driver private data
 * @entry:      which entry you want to retrieve
 * @mc:         which memory controller (0 or 1)
 * @offset:     output tad range offset
 * @limit:      output address of first byte above tad range
 * @ways:       output number of interleave ways
 *
 * The offset value has curious semantics.  It's a sort of running total
 * of the sizes of all the memory regions that aren't mapped in this
 * tad table.
 */
static int knl_get_tad(const struct sbridge_pvt *pvt,
                const int entry,
                const int mc,
                u64 *offset,
                u64 *limit,
                int *ways)
{
        u32 reg_limit_lo, reg_offset_lo, reg_hi;
        struct pci_dev *pci_mc;
        int way_id;

        switch (mc) {
        case 0:
                pci_mc = pvt->knl.pci_mc0;
                break;
        case 1:
                pci_mc = pvt->knl.pci_mc1;
                break;
        default:
                WARN_ON(1);
                return -EINVAL;
        }

        pci_read_config_dword(pci_mc,
                        knl_tad_dram_limit_lo[entry], &reg_limit_lo);
        pci_read_config_dword(pci_mc,
                        knl_tad_dram_offset_lo[entry], &reg_offset_lo);
        pci_read_config_dword(pci_mc,
                        knl_tad_dram_hi[entry], &reg_hi);

        /* Is this TAD entry enabled? */
        if (!GET_BITFIELD(reg_limit_lo, 0, 0))
                return -ENODEV;

        way_id = GET_BITFIELD(reg_limit_lo, 3, 5);

        if (way_id < ARRAY_SIZE(knl_tad_ways)) {
                *ways = knl_tad_ways[way_id];
        } else {
                *ways = 0;
                sbridge_printk(KERN_ERR,
                                "Unexpected value %d in mc_tad_limit_lo wayness field\n",
                                way_id);
                return -ENODEV;
        }

        /*
         * The least significant 6 bits of base and limit are truncated.
         * For limit, we fill the missing bits with 1s.
         */
        *offset = ((u64) GET_BITFIELD(reg_offset_lo, 6, 31) << 6) |
                                ((u64) GET_BITFIELD(reg_hi, 0,  15) << 32);
        *limit = ((u64) GET_BITFIELD(reg_limit_lo,  6, 31) << 6) | 63 |
                                ((u64) GET_BITFIELD(reg_hi, 16, 31) << 32);

        return 0;
}

/* Determine which memory controller is responsible for a given channel. */
static int knl_channel_mc(int channel)
{
        WARN_ON(channel < 0 || channel >= 6);

        return channel < 3 ? 1 : 0;
}

/*
 * Get the Nth entry from EDC_ROUTE_TABLE register.
 * (This is the per-tile mapping of logical interleave targets to
 *  physical EDC modules.)
 *
 * entry 0: 0:2
 *       1: 3:5
 *       2: 6:8
 *       3: 9:11
 *       4: 12:14
 *       5: 15:17
 *       6: 18:20
 *       7: 21:23
 * reserved: 24:31
 */
static u32 knl_get_edc_route(int entry, u32 reg)
{
        WARN_ON(entry >= KNL_MAX_EDCS);
        return GET_BITFIELD(reg, entry*3, (entry*3)+2);
}

/*
 * Get the Nth entry from MC_ROUTE_TABLE register.
 * (This is the per-tile mapping of logical interleave targets to
 *  physical DRAM channels modules.)
 *
 * entry 0: mc 0:2   channel 18:19
 *       1: mc 3:5   channel 20:21
 *       2: mc 6:8   channel 22:23
 *       3: mc 9:11  channel 24:25
 *       4: mc 12:14 channel 26:27
 *       5: mc 15:17 channel 28:29
 * reserved: 30:31
 *
 * Though we have 3 bits to identify the MC, we should only see
 * the values 0 or 1.
 */

static u32 knl_get_mc_route(int entry, u32 reg)
{
        int mc, chan;

        WARN_ON(entry >= KNL_MAX_CHANNELS);

        mc = GET_BITFIELD(reg, entry*3, (entry*3)+2);
        chan = GET_BITFIELD(reg, (entry*2) + 18, (entry*2) + 18 + 1);

        return knl_channel_remap(mc, chan);
}

/*
 * Render the EDC_ROUTE register in human-readable form.
 * Output string s should be at least KNL_MAX_EDCS*2 bytes.
 */
static void knl_show_edc_route(u32 reg, char *s)
{
        int i;

        for (i = 0; i < KNL_MAX_EDCS; i++) {
                s[i*2] = knl_get_edc_route(i, reg) + '0';
                s[i*2+1] = '-';
        }

        s[KNL_MAX_EDCS*2 - 1] = '\0';
}

/*
 * Render the MC_ROUTE register in human-readable form.
 * Output string s should be at least KNL_MAX_CHANNELS*2 bytes.
 */
static void knl_show_mc_route(u32 reg, char *s)
{
        int i;

        for (i = 0; i < KNL_MAX_CHANNELS; i++) {
                s[i*2] = knl_get_mc_route(i, reg) + '0';
                s[i*2+1] = '-';
        }

        s[KNL_MAX_CHANNELS*2 - 1] = '\0';
}

#define KNL_EDC_ROUTE 0xb8
#define KNL_MC_ROUTE 0xb4

/* Is this dram rule backed by regular DRAM in flat mode? */
#define KNL_EDRAM(reg) GET_BITFIELD(reg, 29, 29)

/* Is this dram rule cached? */
#define KNL_CACHEABLE(reg) GET_BITFIELD(reg, 28, 28)

/* Is this rule backed by edc ? */
#define KNL_EDRAM_ONLY(reg) GET_BITFIELD(reg, 29, 29)

/* Is this rule backed by DRAM, cacheable in EDRAM? */
#define KNL_CACHEABLE(reg) GET_BITFIELD(reg, 28, 28)

/* Is this rule mod3? */
#define KNL_MOD3(reg) GET_BITFIELD(reg, 27, 27)

/*
 * Figure out how big our RAM modules are.
 *
 * The DIMMMTR register in KNL doesn't tell us the size of the DIMMs, so we
 * have to figure this out from the SAD rules, interleave lists, route tables,
 * and TAD rules.
 *
 * SAD rules can have holes in them (e.g. the 3G-4G hole), so we have to
 * inspect the TAD rules to figure out how large the SAD regions really are.
 *
 * When we know the real size of a SAD region and how many ways it's
 * interleaved, we know the individual contribution of each channel to
 * TAD is size/ways.
 *
 * Finally, we have to check whether each channel participates in each SAD
 * region.
 *
 * Fortunately, KNL only supports one DIMM per channel, so once we know how
 * much memory the channel uses, we know the DIMM is at least that large.
 * (The BIOS might possibly choose not to map all available memory, in which
 * case we will underreport the size of the DIMM.)
 *
 * In theory, we could try to determine the EDC sizes as well, but that would
 * only work in flat mode, not in cache mode.
 *
 * @mc_sizes: Output sizes of channels (must have space for KNL_MAX_CHANNELS
 *            elements)
 */
static int knl_get_dimm_capacity(struct sbridge_pvt *pvt, u64 *mc_sizes)
{
        u64 sad_base, sad_size, sad_limit = 0;
        u64 tad_base, tad_size, tad_limit, tad_deadspace, tad_livespace;
        int sad_rule = 0;
        int tad_rule = 0;
        int intrlv_ways, tad_ways;
        u32 first_pkg, pkg;
        int i;
        u64 sad_actual_size[2]; /* sad size accounting for holes, per mc */
        u32 dram_rule, interleave_reg;
        u32 mc_route_reg[KNL_MAX_CHAS];
        u32 edc_route_reg[KNL_MAX_CHAS];
        int edram_only;
        char edc_route_string[KNL_MAX_EDCS*2];
        char mc_route_string[KNL_MAX_CHANNELS*2];
        int cur_reg_start;
        int mc;
        int channel;
        int participants[KNL_MAX_CHANNELS];

        for (i = 0; i < KNL_MAX_CHANNELS; i++)
                mc_sizes[i] = 0;

        /* Read the EDC route table in each CHA. */
        cur_reg_start = 0;
        for (i = 0; i < KNL_MAX_CHAS; i++) {
                pci_read_config_dword(pvt->knl.pci_cha[i],
                                KNL_EDC_ROUTE, &edc_route_reg[i]);

                if (i > 0 && edc_route_reg[i] != edc_route_reg[i-1]) {
                        knl_show_edc_route(edc_route_reg[i-1],
                                        edc_route_string);
                        if (cur_reg_start == i-1)
                                edac_dbg(0, "edc route table for CHA %d: %s\n",
                                        cur_reg_start, edc_route_string);
                        else
                                edac_dbg(0, "edc route table for CHA %d-%d: %s\n",
                                        cur_reg_start, i-1, edc_route_string);
                        cur_reg_start = i;
                }
        }
        knl_show_edc_route(edc_route_reg[i-1], edc_route_string);
        if (cur_reg_start == i-1)
                edac_dbg(0, "edc route table for CHA %d: %s\n",
                        cur_reg_start, edc_route_string);
        else
                edac_dbg(0, "edc route table for CHA %d-%d: %s\n",
                        cur_reg_start, i-1, edc_route_string);

        /* Read the MC route table in each CHA. */
        cur_reg_start = 0;
        for (i = 0; i < KNL_MAX_CHAS; i++) {
                pci_read_config_dword(pvt->knl.pci_cha[i],
                        KNL_MC_ROUTE, &mc_route_reg[i]);

                if (i > 0 && mc_route_reg[i] != mc_route_reg[i-1]) {
                        knl_show_mc_route(mc_route_reg[i-1], mc_route_string);
                        if (cur_reg_start == i-1)
                                edac_dbg(0, "mc route table for CHA %d: %s\n",
                                        cur_reg_start, mc_route_string);
                        else
                                edac_dbg(0, "mc route table for CHA %d-%d: %s\n",
                                        cur_reg_start, i-1, mc_route_string);
                        cur_reg_start = i;
                }
        }
        knl_show_mc_route(mc_route_reg[i-1], mc_route_string);
        if (cur_reg_start == i-1)
                edac_dbg(0, "mc route table for CHA %d: %s\n",
                        cur_reg_start, mc_route_string);
        else
                edac_dbg(0, "mc route table for CHA %d-%d: %s\n",
                        cur_reg_start, i-1, mc_route_string);

        /* Process DRAM rules */
        for (sad_rule = 0; sad_rule < pvt->info.max_sad; sad_rule++) {
                /* previous limit becomes the new base */
                sad_base = sad_limit;

                pci_read_config_dword(pvt->pci_sad0,
                        pvt->info.dram_rule[sad_rule], &dram_rule);

                if (!DRAM_RULE_ENABLE(dram_rule))
                        break;

                edram_only = KNL_EDRAM_ONLY(dram_rule);

                sad_limit = pvt->info.sad_limit(dram_rule)+1;
                sad_size = sad_limit - sad_base;

                pci_read_config_dword(pvt->pci_sad0,
                        pvt->info.interleave_list[sad_rule], &interleave_reg);

                /*
                 * Find out how many ways this dram rule is interleaved.
                 * We stop when we see the first channel again.
                 */
                first_pkg = sad_pkg(pvt->info.interleave_pkg,
                                                interleave_reg, 0);
                for (intrlv_ways = 1; intrlv_ways < 8; intrlv_ways++) {
                        pkg = sad_pkg(pvt->info.interleave_pkg,
                                                interleave_reg, intrlv_ways);

                        if ((pkg & 0x8) == 0) {
                                /*
                                 * 0 bit means memory is non-local,
                                 * which KNL doesn't support
                                 */
                                edac_dbg(0, "Unexpected interleave target %d\n",
                                        pkg);
                                return -1;
                        }

                        if (pkg == first_pkg)
                                break;
                }
                if (KNL_MOD3(dram_rule))
                        intrlv_ways *= 3;

                edac_dbg(3, "dram rule %d (base 0x%llx, limit 0x%llx), %d way interleave%s\n",
                        sad_rule,
                        sad_base,
                        sad_limit,
                        intrlv_ways,
                        edram_only ? ", EDRAM" : "");

                /*
                 * Find out how big the SAD region really is by iterating
                 * over TAD tables (SAD regions may contain holes).
                 * Each memory controller might have a different TAD table, so
                 * we have to look at both.
                 *
                 * Livespace is the memory that's mapped in this TAD table,
                 * deadspace is the holes (this could be the MMIO hole, or it
                 * could be memory that's mapped by the other TAD table but
                 * not this one).
                 */
                for (mc = 0; mc < 2; mc++) {
                        sad_actual_size[mc] = 0;
                        tad_livespace = 0;
                        for (tad_rule = 0;
                                        tad_rule < ARRAY_SIZE(
                                                knl_tad_dram_limit_lo);
                                        tad_rule++) {
                                if (knl_get_tad(pvt,
                                                tad_rule,
                                                mc,
                                                &tad_deadspace,
                                                &tad_limit,
                                                &tad_ways))
                                        break;

                                tad_size = (tad_limit+1) -
                                        (tad_livespace + tad_deadspace);
                                tad_livespace += tad_size;
                                tad_base = (tad_limit+1) - tad_size;

                                if (tad_base < sad_base) {
                                        if (tad_limit > sad_base)
                                                edac_dbg(0, "TAD region overlaps lower SAD boundary -- TAD tables may be configured incorrectly.\n");
                                } else if (tad_base < sad_limit) {
                                        if (tad_limit+1 > sad_limit) {
                                                edac_dbg(0, "TAD region overlaps upper SAD boundary -- TAD tables may be configured incorrectly.\n");
                                        } else {
                                                /* TAD region is completely inside SAD region */
                                                edac_dbg(3, "TAD region %d 0x%llx - 0x%llx (%lld bytes) table%d\n",
                                                        tad_rule, tad_base,
                                                        tad_limit, tad_size,
                                                        mc);
                                                sad_actual_size[mc] += tad_size;
                                        }
                                }
                                tad_base = tad_limit+1;
                        }
                }

                for (mc = 0; mc < 2; mc++) {
                        edac_dbg(3, " total TAD DRAM footprint in table%d : 0x%llx (%lld bytes)\n",
                                mc, sad_actual_size[mc], sad_actual_size[mc]);
                }

                /* Ignore EDRAM rule */
                if (edram_only)
                        continue;

                /* Figure out which channels participate in interleave. */
                for (channel = 0; channel < KNL_MAX_CHANNELS; channel++)
                        participants[channel] = 0;

                /* For each channel, does at least one CHA have
                 * this channel mapped to the given target?
                 */
                for (channel = 0; channel < KNL_MAX_CHANNELS; channel++) {
                        int target;
                        int cha;

                        for (target = 0; target < KNL_MAX_CHANNELS; target++) {
                                for (cha = 0; cha < KNL_MAX_CHAS; cha++) {
                                        if (knl_get_mc_route(target,
                                                mc_route_reg[cha]) == channel
                                                && !participants[channel]) {
                                                participants[channel] = 1;
                                                break;
                                        }
                                }
                        }
                }

                for (channel = 0; channel < KNL_MAX_CHANNELS; channel++) {
                        mc = knl_channel_mc(channel);
                        if (participants[channel]) {
                                edac_dbg(4, "mc channel %d contributes %lld bytes via sad entry %d\n",
                                        channel,
                                        sad_actual_size[mc]/intrlv_ways,
                                        sad_rule);
                                mc_sizes[channel] +=
                                        sad_actual_size[mc]/intrlv_ways;
                        }
                }
        }

        return 0;
}

static int get_dimm_config(struct mem_ctl_info *mci)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct dimm_info *dimm;
        unsigned i, j, banks, ranks, rows, cols, npages;
        u64 size;
        u32 reg;
        enum edac_type mode;
        enum mem_type mtype;
        int channels = pvt->info.type == KNIGHTS_LANDING ?
                KNL_MAX_CHANNELS : NUM_CHANNELS;
        u64 knl_mc_sizes[KNL_MAX_CHANNELS];

        if (pvt->info.type == HASWELL || pvt->info.type == BROADWELL) {
                pci_read_config_dword(pvt->pci_ha0, HASWELL_HASYSDEFEATURE2, &reg);
                pvt->is_chan_hash = GET_BITFIELD(reg, 21, 21);
        }
        if (pvt->info.type == HASWELL || pvt->info.type == BROADWELL ||
                        pvt->info.type == KNIGHTS_LANDING)
                pci_read_config_dword(pvt->pci_sad1, SAD_TARGET, &reg);
        else
                pci_read_config_dword(pvt->pci_br0, SAD_TARGET, &reg);

        if (pvt->info.type == KNIGHTS_LANDING)
                pvt->sbridge_dev->source_id = SOURCE_ID_KNL(reg);
        else
                pvt->sbridge_dev->source_id = SOURCE_ID(reg);

        pvt->sbridge_dev->node_id = pvt->info.get_node_id(pvt);
        edac_dbg(0, "mc#%d: Node ID: %d, source ID: %d\n",
                 pvt->sbridge_dev->mc,
                 pvt->sbridge_dev->node_id,
                 pvt->sbridge_dev->source_id);

        /* KNL doesn't support mirroring or lockstep,
         * and is always closed page
         */
        if (pvt->info.type == KNIGHTS_LANDING) {
                mode = EDAC_S4ECD4ED;
                pvt->is_mirrored = false;

                if (knl_get_dimm_capacity(pvt, knl_mc_sizes) != 0)
                        return -1;
        } else {
                pci_read_config_dword(pvt->pci_ras, RASENABLES, &reg);
                if (IS_MIRROR_ENABLED(reg)) {
                        edac_dbg(0, "Memory mirror is enabled\n");
                        pvt->is_mirrored = true;
                } else {
                        edac_dbg(0, "Memory mirror is disabled\n");
                        pvt->is_mirrored = false;
                }

                pci_read_config_dword(pvt->pci_ta, MCMTR, &pvt->info.mcmtr);
                if (IS_LOCKSTEP_ENABLED(pvt->info.mcmtr)) {
                        edac_dbg(0, "Lockstep is enabled\n");
                        mode = EDAC_S8ECD8ED;
                        pvt->is_lockstep = true;
                } else {
                        edac_dbg(0, "Lockstep is disabled\n");
                        mode = EDAC_S4ECD4ED;
                        pvt->is_lockstep = false;
                }
                if (IS_CLOSE_PG(pvt->info.mcmtr)) {
                        edac_dbg(0, "address map is on closed page mode\n");
                        pvt->is_close_pg = true;
                } else {
                        edac_dbg(0, "address map is on open page mode\n");
                        pvt->is_close_pg = false;
                }
        }

        mtype = pvt->info.get_memory_type(pvt);
        if (mtype == MEM_RDDR3 || mtype == MEM_RDDR4)
                edac_dbg(0, "Memory is registered\n");
        else if (mtype == MEM_UNKNOWN)
                edac_dbg(0, "Cannot determine memory type\n");
        else
                edac_dbg(0, "Memory is unregistered\n");

        if (mtype == MEM_DDR4 || mtype == MEM_RDDR4)
                banks = 16;
        else
                banks = 8;

        for (i = 0; i < channels; i++) {
                u32 mtr;

                int max_dimms_per_channel;

                if (pvt->info.type == KNIGHTS_LANDING) {
                        max_dimms_per_channel = 1;
                        if (!pvt->knl.pci_channel[i])
                                continue;
                } else {
                        max_dimms_per_channel = ARRAY_SIZE(mtr_regs);
                        if (!pvt->pci_tad[i])
                                continue;
                }

                for (j = 0; j < max_dimms_per_channel; j++) {
                        dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, mci->n_layers,
                                       i, j, 0);
                        if (pvt->info.type == KNIGHTS_LANDING) {
                                pci_read_config_dword(pvt->knl.pci_channel[i],
                                        knl_mtr_reg, &mtr);
                        } else {
                                pci_read_config_dword(pvt->pci_tad[i],
                                        mtr_regs[j], &mtr);
                        }
                        edac_dbg(4, "Channel #%d  MTR%d = %x\n", i, j, mtr);
                        if (IS_DIMM_PRESENT(mtr)) {
                                pvt->channel[i].dimms++;

                                ranks = numrank(pvt->info.type, mtr);

                                if (pvt->info.type == KNIGHTS_LANDING) {
                                        /* For DDR4, this is fixed. */
                                        cols = 1 << 10;
                                        rows = knl_mc_sizes[i] /
                                                ((u64) cols * ranks * banks * 8);
                                } else {
                                        rows = numrow(mtr);
                                        cols = numcol(mtr);
                                }

                                size = ((u64)rows * cols * banks * ranks) >> (20 - 3);
                                npages = MiB_TO_PAGES(size);

                                edac_dbg(0, "mc#%d: ha %d channel %d, dimm %d, %lld Mb (%d pages) bank: %d, rank: %d, row: %#x, col: %#x\n",
                                         pvt->sbridge_dev->mc, i/4, i%4, j,
                                         size, npages,
                                         banks, ranks, rows, cols);

                                dimm->nr_pages = npages;
                                dimm->grain = 32;
                                dimm->dtype = pvt->info.get_width(pvt, mtr);
                                dimm->mtype = mtype;
                                dimm->edac_mode = mode;
                                snprintf(dimm->label, sizeof(dimm->label),
                                         "CPU_SrcID#%u_Ha#%u_Chan#%u_DIMM#%u",
                                         pvt->sbridge_dev->source_id, i/4, i%4, j);
                        }
                }
        }

        return 0;
}

static void get_memory_layout(const struct mem_ctl_info *mci)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        int i, j, k, n_sads, n_tads, sad_interl;
        u32 reg;
        u64 limit, prv = 0;
        u64 tmp_mb;
        u32 gb, mb;
        u32 rir_way;

        /*
         * Step 1) Get TOLM/TOHM ranges
         */

        pvt->tolm = pvt->info.get_tolm(pvt);
        tmp_mb = (1 + pvt->tolm) >> 20;

        gb = div_u64_rem(tmp_mb, 1024, &mb);
        edac_dbg(0, "TOLM: %u.%03u GB (0x%016Lx)\n",
                gb, (mb*1000)/1024, (u64)pvt->tolm);

        /* Address range is already 45:25 */
        pvt->tohm = pvt->info.get_tohm(pvt);
        tmp_mb = (1 + pvt->tohm) >> 20;

        gb = div_u64_rem(tmp_mb, 1024, &mb);
        edac_dbg(0, "TOHM: %u.%03u GB (0x%016Lx)\n",
                gb, (mb*1000)/1024, (u64)pvt->tohm);

        /*
         * Step 2) Get SAD range and SAD Interleave list
         * TAD registers contain the interleave wayness. However, it
         * seems simpler to just discover it indirectly, with the
         * algorithm bellow.
         */
        prv = 0;
        for (n_sads = 0; n_sads < pvt->info.max_sad; n_sads++) {
                /* SAD_LIMIT Address range is 45:26 */
                pci_read_config_dword(pvt->pci_sad0, pvt->info.dram_rule[n_sads],
                                      &reg);
                limit = pvt->info.sad_limit(reg);

                if (!DRAM_RULE_ENABLE(reg))
                        continue;

                if (limit <= prv)
                        break;

                tmp_mb = (limit + 1) >> 20;
                gb = div_u64_rem(tmp_mb, 1024, &mb);
                edac_dbg(0, "SAD#%d %s up to %u.%03u GB (0x%016Lx) Interleave: %s reg=0x%08x\n",
                         n_sads,
                         show_dram_attr(pvt->info.dram_attr(reg)),
                         gb, (mb*1000)/1024,
                         ((u64)tmp_mb) << 20L,
                         pvt->info.show_interleave_mode(reg),
                         reg);
                prv = limit;

                pci_read_config_dword(pvt->pci_sad0, pvt->info.interleave_list[n_sads],
                                      &reg);
                sad_interl = sad_pkg(pvt->info.interleave_pkg, reg, 0);
                for (j = 0; j < 8; j++) {
                        u32 pkg = sad_pkg(pvt->info.interleave_pkg, reg, j);
                        if (j > 0 && sad_interl == pkg)
                                break;

                        edac_dbg(0, "SAD#%d, interleave #%d: %d\n",
                                 n_sads, j, pkg);
                }
        }

        if (pvt->info.type == KNIGHTS_LANDING)
                return;

        /*
         * Step 3) Get TAD range
         */
        prv = 0;
        for (n_tads = 0; n_tads < MAX_TAD; n_tads++) {
                pci_read_config_dword(pvt->pci_ha0, tad_dram_rule[n_tads],
                                      &reg);
                limit = TAD_LIMIT(reg);
                if (limit <= prv)
                        break;
                tmp_mb = (limit + 1) >> 20;

                gb = div_u64_rem(tmp_mb, 1024, &mb);
                edac_dbg(0, "TAD#%d: up to %u.%03u GB (0x%016Lx), socket interleave %d, memory interleave %d, TGT: %d, %d, %d, %d, reg=0x%08x\n",
                         n_tads, gb, (mb*1000)/1024,
                         ((u64)tmp_mb) << 20L,
                         (u32)(1 << TAD_SOCK(reg)),
                         (u32)TAD_CH(reg) + 1,
                         (u32)TAD_TGT0(reg),
                         (u32)TAD_TGT1(reg),
                         (u32)TAD_TGT2(reg),
                         (u32)TAD_TGT3(reg),
                         reg);
                prv = limit;
        }

        /*
         * Step 4) Get TAD offsets, per each channel
         */
        for (i = 0; i < NUM_CHANNELS; i++) {
                if (!pvt->channel[i].dimms)
                        continue;
                for (j = 0; j < n_tads; j++) {
                        pci_read_config_dword(pvt->pci_tad[i],
                                              tad_ch_nilv_offset[j],
                                              &reg);
                        tmp_mb = TAD_OFFSET(reg) >> 20;
                        gb = div_u64_rem(tmp_mb, 1024, &mb);
                        edac_dbg(0, "TAD CH#%d, offset #%d: %u.%03u GB (0x%016Lx), reg=0x%08x\n",
                                 i, j,
                                 gb, (mb*1000)/1024,
                                 ((u64)tmp_mb) << 20L,
                                 reg);
                }
        }

        /*
         * Step 6) Get RIR Wayness/Limit, per each channel
         */
        for (i = 0; i < NUM_CHANNELS; i++) {
                if (!pvt->channel[i].dimms)
                        continue;
                for (j = 0; j < MAX_RIR_RANGES; j++) {
                        pci_read_config_dword(pvt->pci_tad[i],
                                              rir_way_limit[j],
                                              &reg);

                        if (!IS_RIR_VALID(reg))
                                continue;

                        tmp_mb = pvt->info.rir_limit(reg) >> 20;
                        rir_way = 1 << RIR_WAY(reg);
                        gb = div_u64_rem(tmp_mb, 1024, &mb);
                        edac_dbg(0, "CH#%d RIR#%d, limit: %u.%03u GB (0x%016Lx), way: %d, reg=0x%08x\n",
                                 i, j,
                                 gb, (mb*1000)/1024,
                                 ((u64)tmp_mb) << 20L,
                                 rir_way,
                                 reg);

                        for (k = 0; k < rir_way; k++) {
                                pci_read_config_dword(pvt->pci_tad[i],
                                                      rir_offset[j][k],
                                                      &reg);
                                tmp_mb = RIR_OFFSET(pvt->info.type, reg) << 6;

                                gb = div_u64_rem(tmp_mb, 1024, &mb);
                                edac_dbg(0, "CH#%d RIR#%d INTL#%d, offset %u.%03u GB (0x%016Lx), tgt: %d, reg=0x%08x\n",
                                         i, j, k,
                                         gb, (mb*1000)/1024,
                                         ((u64)tmp_mb) << 20L,
                                         (u32)RIR_RNK_TGT(pvt->info.type, reg),
                                         reg);
                        }
                }
        }
}

static struct mem_ctl_info *get_mci_for_node_id(u8 node_id)
{
        struct sbridge_dev *sbridge_dev;

        list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
                if (sbridge_dev->node_id == node_id)
                        return sbridge_dev->mci;
        }
        return NULL;
}

static int get_memory_error_data(struct mem_ctl_info *mci,
                                 u64 addr,
                                 u8 *socket, u8 *ha,
                                 long *channel_mask,
                                 u8 *rank,
                                 char **area_type, char *msg)
{
        struct mem_ctl_info     *new_mci;
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev          *pci_ha;
        int                     n_rir, n_sads, n_tads, sad_way, sck_xch;
        int                     sad_interl, idx, base_ch;
        int                     interleave_mode, shiftup = 0;
        unsigned                sad_interleave[pvt->info.max_interleave];
        u32                     reg, dram_rule;
        u8                      ch_way, sck_way, pkg, sad_ha = 0, ch_add = 0;
        u32                     tad_offset;
        u32                     rir_way;
        u32                     mb, gb;
        u64                     ch_addr, offset, limit = 0, prv = 0;


        /*
         * Step 0) Check if the address is at special memory ranges
         * The check bellow is probably enough to fill all cases where
         * the error is not inside a memory, except for the legacy
         * range (e. g. VGA addresses). It is unlikely, however, that the
         * memory controller would generate an error on that range.
         */
        if ((addr > (u64) pvt->tolm) && (addr < (1LL << 32))) {
                sprintf(msg, "Error at TOLM area, on addr 0x%08Lx", addr);
                return -EINVAL;
        }
        if (addr >= (u64)pvt->tohm) {
                sprintf(msg, "Error at MMIOH area, on addr 0x%016Lx", addr);
                return -EINVAL;
        }

        /*
         * Step 1) Get socket
         */
        for (n_sads = 0; n_sads < pvt->info.max_sad; n_sads++) {
                pci_read_config_dword(pvt->pci_sad0, pvt->info.dram_rule[n_sads],
                                      &reg);

                if (!DRAM_RULE_ENABLE(reg))
                        continue;

                limit = pvt->info.sad_limit(reg);
                if (limit <= prv) {
                        sprintf(msg, "Can't discover the memory socket");
                        return -EINVAL;
                }
                if  (addr <= limit)
                        break;
                prv = limit;
        }
        if (n_sads == pvt->info.max_sad) {
                sprintf(msg, "Can't discover the memory socket");
                return -EINVAL;
        }
        dram_rule = reg;
        *area_type = show_dram_attr(pvt->info.dram_attr(dram_rule));
        interleave_mode = pvt->info.interleave_mode(dram_rule);

        pci_read_config_dword(pvt->pci_sad0, pvt->info.interleave_list[n_sads],
                              &reg);

        if (pvt->info.type == SANDY_BRIDGE) {
                sad_interl = sad_pkg(pvt->info.interleave_pkg, reg, 0);
                for (sad_way = 0; sad_way < 8; sad_way++) {
                        u32 pkg = sad_pkg(pvt->info.interleave_pkg, reg, sad_way);

                        if (sad_way > 0 && sad_interl == pkg)
                                break;
                        sad_interleave[sad_way] = pkg;
                        edac_dbg(0, "SAD interleave #%d: %d\n",
                                 sad_way, sad_interleave[sad_way]);
                }
                edac_dbg(0, "mc#%d: Error detected on SAD#%d: address 0x%016Lx < 0x%016Lx, Interleave [%d:6]%s\n",
                         pvt->sbridge_dev->mc,
                         n_sads,
                         addr,
                         limit,
                         sad_way + 7,
                         !interleave_mode ? "" : "XOR[18:16]");
                if (interleave_mode)
                        idx = ((addr >> 6) ^ (addr >> 16)) & 7;
                else
                        idx = (addr >> 6) & 7;
                switch (sad_way) {
                case 1:
                        idx = 0;
                        break;
                case 2:
                        idx = idx & 1;
                        break;
                case 4:
                        idx = idx & 3;
                        break;
                case 8:
                        break;
                default:
                        sprintf(msg, "Can't discover socket interleave");
                        return -EINVAL;
                }
                *socket = sad_interleave[idx];
                edac_dbg(0, "SAD interleave index: %d (wayness %d) = CPU socket %d\n",
                         idx, sad_way, *socket);
        } else if (pvt->info.type == HASWELL || pvt->info.type == BROADWELL) {
                int bits, a7mode = A7MODE(dram_rule);

                if (a7mode) {
                        /* A7 mode swaps P9 with P6 */
                        bits = GET_BITFIELD(addr, 7, 8) << 1;
                        bits |= GET_BITFIELD(addr, 9, 9);
                } else
                        bits = GET_BITFIELD(addr, 6, 8);

                if (interleave_mode == 0) {
                        /* interleave mode will XOR {8,7,6} with {18,17,16} */
                        idx = GET_BITFIELD(addr, 16, 18);
                        idx ^= bits;
                } else
                        idx = bits;

                pkg = sad_pkg(pvt->info.interleave_pkg, reg, idx);
                *socket = sad_pkg_socket(pkg);
                sad_ha = sad_pkg_ha(pkg);
                if (sad_ha)
                        ch_add = 4;

                if (a7mode) {
                        /* MCChanShiftUpEnable */
                        pci_read_config_dword(pvt->pci_ha0,
                                              HASWELL_HASYSDEFEATURE2, &reg);
                        shiftup = GET_BITFIELD(reg, 22, 22);
                }

                edac_dbg(0, "SAD interleave package: %d = CPU socket %d, HA %i, shiftup: %i\n",
                         idx, *socket, sad_ha, shiftup);
        } else {
                /* Ivy Bridge's SAD mode doesn't support XOR interleave mode */
                idx = (addr >> 6) & 7;
                pkg = sad_pkg(pvt->info.interleave_pkg, reg, idx);
                *socket = sad_pkg_socket(pkg);
                sad_ha = sad_pkg_ha(pkg);
                if (sad_ha)
                        ch_add = 4;
                edac_dbg(0, "SAD interleave package: %d = CPU socket %d, HA %d\n",
                         idx, *socket, sad_ha);
        }

        *ha = sad_ha;

        /*
         * Move to the proper node structure, in order to access the
         * right PCI registers
         */
        new_mci = get_mci_for_node_id(*socket);
        if (!new_mci) {
                sprintf(msg, "Struct for socket #%u wasn't initialized",
                        *socket);
                return -EINVAL;
        }
        mci = new_mci;
        pvt = mci->pvt_info;

        /*
         * Step 2) Get memory channel
         */
        prv = 0;
        if (pvt->info.type == SANDY_BRIDGE)
                pci_ha = pvt->pci_ha0;
        else {
                if (sad_ha)
                        pci_ha = pvt->pci_ha1;
                else
                        pci_ha = pvt->pci_ha0;
        }
        for (n_tads = 0; n_tads < MAX_TAD; n_tads++) {
                pci_read_config_dword(pci_ha, tad_dram_rule[n_tads], &reg);
                limit = TAD_LIMIT(reg);
                if (limit <= prv) {
                        sprintf(msg, "Can't discover the memory channel");
                        return -EINVAL;
                }
                if  (addr <= limit)
                        break;
                prv = limit;
        }
        if (n_tads == MAX_TAD) {
                sprintf(msg, "Can't discover the memory channel");
                return -EINVAL;
        }

        ch_way = TAD_CH(reg) + 1;
        sck_way = TAD_SOCK(reg);

        if (ch_way == 3)
                idx = addr >> 6;
        else {
                idx = (addr >> (6 + sck_way + shiftup)) & 0x3;
                if (pvt->is_chan_hash)
                        idx = haswell_chan_hash(idx, addr);
        }
        idx = idx % ch_way;

        /*
         * FIXME: Shouldn't we use CHN_IDX_OFFSET() here, when ch_way == 3 ???
         */
        switch (idx) {
        case 0:
                base_ch = TAD_TGT0(reg);
                break;
        case 1:
                base_ch = TAD_TGT1(reg);
                break;
        case 2:
                base_ch = TAD_TGT2(reg);
                break;
        case 3:
                base_ch = TAD_TGT3(reg);
                break;
        default:
                sprintf(msg, "Can't discover the TAD target");
                return -EINVAL;
        }
        *channel_mask = 1 << base_ch;

        pci_read_config_dword(pvt->pci_tad[ch_add + base_ch],
                                tad_ch_nilv_offset[n_tads],
                                &tad_offset);

        if (pvt->is_mirrored) {
                *channel_mask |= 1 << ((base_ch + 2) % 4);
                switch(ch_way) {
                case 2:
                case 4:
                        sck_xch = (1 << sck_way) * (ch_way >> 1);
                        break;
                default:
                        sprintf(msg, "Invalid mirror set. Can't decode addr");
                        return -EINVAL;
                }
        } else
                sck_xch = (1 << sck_way) * ch_way;

        if (pvt->is_lockstep)
                *channel_mask |= 1 << ((base_ch + 1) % 4);

        offset = TAD_OFFSET(tad_offset);

        edac_dbg(0, "TAD#%d: address 0x%016Lx < 0x%016Lx, socket interleave %d, channel interleave %d (offset 0x%08Lx), index %d, base ch: %d, ch mask: 0x%02lx\n",
                 n_tads,
                 addr,
                 limit,
                 sck_way,
                 ch_way,
                 offset,
                 idx,
                 base_ch,
                 *channel_mask);

        /* Calculate channel address */
        /* Remove the TAD offset */

        if (offset > addr) {
                sprintf(msg, "Can't calculate ch addr: TAD offset 0x%08Lx is too high for addr 0x%08Lx!",
                        offset, addr);
                return -EINVAL;
        }

        ch_addr = addr - offset;
        ch_addr >>= (6 + shiftup);
        ch_addr /= sck_xch;
        ch_addr <<= (6 + shiftup);
        ch_addr |= addr & ((1 << (6 + shiftup)) - 1);

        /*
         * Step 3) Decode rank
         */
        for (n_rir = 0; n_rir < MAX_RIR_RANGES; n_rir++) {
                pci_read_config_dword(pvt->pci_tad[ch_add + base_ch],
                                      rir_way_limit[n_rir],
                                      &reg);

                if (!IS_RIR_VALID(reg))
                        continue;

                limit = pvt->info.rir_limit(reg);
                gb = div_u64_rem(limit >> 20, 1024, &mb);
                edac_dbg(0, "RIR#%d, limit: %u.%03u GB (0x%016Lx), way: %d\n",
                         n_rir,
                         gb, (mb*1000)/1024,
                         limit,
                         1 << RIR_WAY(reg));
                if  (ch_addr <= limit)
                        break;
        }
        if (n_rir == MAX_RIR_RANGES) {
                sprintf(msg, "Can't discover the memory rank for ch addr 0x%08Lx",
                        ch_addr);
                return -EINVAL;
        }
        rir_way = RIR_WAY(reg);

        if (pvt->is_close_pg)
                idx = (ch_addr >> 6);
        else
                idx = (ch_addr >> 13);  /* FIXME: Datasheet says to shift by 15 */
        idx %= 1 << rir_way;

        pci_read_config_dword(pvt->pci_tad[ch_add + base_ch],
                              rir_offset[n_rir][idx],
                              &reg);
        *rank = RIR_RNK_TGT(pvt->info.type, reg);

        edac_dbg(0, "RIR#%d: channel address 0x%08Lx < 0x%08Lx, RIR interleave %d, index %d\n",
                 n_rir,
                 ch_addr,
                 limit,
                 rir_way,
                 idx);

        return 0;
}

/****************************************************************************
        Device initialization routines: put/get, init/exit
 ****************************************************************************/

/*
 *      sbridge_put_all_devices 'put' all the devices that we have
 *                              reserved via 'get'
 */
static void sbridge_put_devices(struct sbridge_dev *sbridge_dev)
{
        int i;

        edac_dbg(0, "\n");
        for (i = 0; i < sbridge_dev->n_devs; i++) {
                struct pci_dev *pdev = sbridge_dev->pdev[i];
                if (!pdev)
                        continue;
                edac_dbg(0, "Removing dev %02x:%02x.%d\n",
                         pdev->bus->number,
                         PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
                pci_dev_put(pdev);
        }
}

static void sbridge_put_all_devices(void)
{
        struct sbridge_dev *sbridge_dev, *tmp;

        list_for_each_entry_safe(sbridge_dev, tmp, &sbridge_edac_list, list) {
                sbridge_put_devices(sbridge_dev);
                free_sbridge_dev(sbridge_dev);
        }
}

static int sbridge_get_onedevice(struct pci_dev **prev,
                                 u8 *num_mc,
                                 const struct pci_id_table *table,
                                 const unsigned devno,
                                 const int multi_bus)
{
        struct sbridge_dev *sbridge_dev;
        const struct pci_id_descr *dev_descr = &table->descr[devno];
        struct pci_dev *pdev = NULL;
        u8 bus = 0;

        sbridge_printk(KERN_DEBUG,
                "Seeking for: PCI ID %04x:%04x\n",
                PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

        pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
                              dev_descr->dev_id, *prev);

        if (!pdev) {
                if (*prev) {
                        *prev = pdev;
                        return 0;
                }

                if (dev_descr->optional)
                        return 0;

                /* if the HA wasn't found */
                if (devno == 0)
                        return -ENODEV;

                sbridge_printk(KERN_INFO,
                        "Device not found: %04x:%04x\n",
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

                /* End of list, leave */
                return -ENODEV;
        }
        bus = pdev->bus->number;

        sbridge_dev = get_sbridge_dev(bus, multi_bus);
        if (!sbridge_dev) {
                sbridge_dev = alloc_sbridge_dev(bus, table);
                if (!sbridge_dev) {
                        pci_dev_put(pdev);
                        return -ENOMEM;
                }
                (*num_mc)++;
        }

        if (sbridge_dev->pdev[devno]) {
                sbridge_printk(KERN_ERR,
                        "Duplicated device for %04x:%04x\n",
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
                pci_dev_put(pdev);
                return -ENODEV;
        }

        sbridge_dev->pdev[devno] = pdev;

        /* Be sure that the device is enabled */
        if (unlikely(pci_enable_device(pdev) < 0)) {
                sbridge_printk(KERN_ERR,
                        "Couldn't enable %04x:%04x\n",
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
                return -ENODEV;
        }

        edac_dbg(0, "Detected %04x:%04x\n",
                 PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

        /*
         * As stated on drivers/pci/search.c, the reference count for
         * @from is always decremented if it is not %NULL. So, as we need
         * to get all devices up to null, we need to do a get for the device
         */
        pci_dev_get(pdev);

        *prev = pdev;

        return 0;
}

/*
 * sbridge_get_all_devices - Find and perform 'get' operation on the MCH's
 *                           devices we want to reference for this driver.
 * @num_mc: pointer to the memory controllers count, to be incremented in case
 *          of success.
 * @table: model specific table
 *
 * returns 0 in case of success or error code
 */
static int sbridge_get_all_devices(u8 *num_mc,
                                        const struct pci_id_table *table)
{
        int i, rc;
        struct pci_dev *pdev = NULL;
        int allow_dups = 0;
        int multi_bus = 0;

        if (table->type == KNIGHTS_LANDING)
                allow_dups = multi_bus = 1;
        while (table && table->descr) {
                for (i = 0; i < table->n_devs; i++) {
                        if (!allow_dups || i == 0 ||
                                        table->descr[i].dev_id !=
                                                table->descr[i-1].dev_id) {
                                pdev = NULL;
                        }
                        do {
                                rc = sbridge_get_onedevice(&pdev, num_mc,
                                                           table, i, multi_bus);
                                if (rc < 0) {
                                        if (i == 0) {
                                                i = table->n_devs;
                                                break;
                                        }
                                        sbridge_put_all_devices();
                                        return -ENODEV;
                                }
                        } while (pdev && !allow_dups);
                }
                table++;
        }

        return 0;
}

static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
                                 struct sbridge_dev *sbridge_dev)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        u8 saw_chan_mask = 0;
        int i;

        for (i = 0; i < sbridge_dev->n_devs; i++) {
                pdev = sbridge_dev->pdev[i];
                if (!pdev)
                        continue;

                switch (pdev->device) {
                case PCI_DEVICE_ID_INTEL_SBRIDGE_SAD0:
                        pvt->pci_sad0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_SAD1:
                        pvt->pci_sad1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_BR:
                        pvt->pci_br0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0:
                        pvt->pci_ha0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA:
                        pvt->pci_ta = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_RAS:
                        pvt->pci_ras = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0:
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD1:
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD2:
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0;
                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO:
                        pvt->pci_ddrio = pdev;
                        break;
                default:
                        goto error;
                }

                edac_dbg(0, "Associated PCI %02x:%02x, bus %d with dev = %p\n",
                         pdev->vendor, pdev->device,
                         sbridge_dev->bus,
                         pdev);
        }

        /* Check if everything were registered */
        if (!pvt->pci_sad0 || !pvt->pci_sad1 || !pvt->pci_ha0 ||
            !pvt-> pci_tad || !pvt->pci_ras  || !pvt->pci_ta)
                goto enodev;

        if (saw_chan_mask != 0x0f)
                goto enodev;
        return 0;

enodev:
        sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
        return -ENODEV;

error:
        sbridge_printk(KERN_ERR, "Unexpected device %02x:%02x\n",
                       PCI_VENDOR_ID_INTEL, pdev->device);
        return -EINVAL;
}

static int ibridge_mci_bind_devs(struct mem_ctl_info *mci,
                                 struct sbridge_dev *sbridge_dev)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        u8 saw_chan_mask = 0;
        int i;

        for (i = 0; i < sbridge_dev->n_devs; i++) {
                pdev = sbridge_dev->pdev[i];
                if (!pdev)
                        continue;

                switch (pdev->device) {
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0:
                        pvt->pci_ha0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA:
                        pvt->pci_ta = pdev;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_RAS:
                        pvt->pci_ras = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD0:
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD1:
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD2:
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TAD0;
                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_2HA_DDRIO0:
                        pvt->pci_ddrio = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_1HA_DDRIO0:
                        pvt->pci_ddrio = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_SAD:
                        pvt->pci_sad0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_BR0:
                        pvt->pci_br0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_BR1:
                        pvt->pci_br1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1:
                        pvt->pci_ha1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD0:
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD1:
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD2:
                case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA1_TAD0 + 4;
                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                default:
                        goto error;
                }

                edac_dbg(0, "Associated PCI %02x.%02d.%d with dev = %p\n",
                         sbridge_dev->bus,
                         PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
                         pdev);
        }

        /* Check if everything were registered */
        if (!pvt->pci_sad0 || !pvt->pci_ha0 || !pvt->pci_br0 ||
            !pvt->pci_br1 || !pvt->pci_tad || !pvt->pci_ras  ||
            !pvt->pci_ta)
                goto enodev;

        if (saw_chan_mask != 0x0f && /* -EN */
            saw_chan_mask != 0x33 && /* -EP */
            saw_chan_mask != 0xff)   /* -EX */
                goto enodev;
        return 0;

enodev:
        sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
        return -ENODEV;

error:
        sbridge_printk(KERN_ERR,
                       "Unexpected device %02x:%02x\n", PCI_VENDOR_ID_INTEL,
                        pdev->device);
        return -EINVAL;
}

static int haswell_mci_bind_devs(struct mem_ctl_info *mci,
                                 struct sbridge_dev *sbridge_dev)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        u8 saw_chan_mask = 0;
        int i;

        /* there's only one device per system; not tied to any bus */
        if (pvt->info.pci_vtd == NULL)
                /* result will be checked later */
                pvt->info.pci_vtd = pci_get_device(PCI_VENDOR_ID_INTEL,
                                                   PCI_DEVICE_ID_INTEL_HASWELL_IMC_VTD_MISC,
                                                   NULL);

        for (i = 0; i < sbridge_dev->n_devs; i++) {
                pdev = sbridge_dev->pdev[i];
                if (!pdev)
                        continue;

                switch (pdev->device) {
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_CBO_SAD0:
                        pvt->pci_sad0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_CBO_SAD1:
                        pvt->pci_sad1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0:
                        pvt->pci_ha0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TA:
                        pvt->pci_ta = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_THERMAL:
                        pvt->pci_ras = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD0:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD1:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD2:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0_TAD0;

                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD0:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD1:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD2:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TAD0 + 4;

                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO0:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO1:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO2:
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_DDRIO3:
                        if (!pvt->pci_ddrio)
                                pvt->pci_ddrio = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1:
                        pvt->pci_ha1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA1_TA:
                        pvt->pci_ha1_ta = pdev;
                        break;
                default:
                        break;
                }

                edac_dbg(0, "Associated PCI %02x.%02d.%d with dev = %p\n",
                         sbridge_dev->bus,
                         PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
                         pdev);
        }

        /* Check if everything were registered */
        if (!pvt->pci_sad0 || !pvt->pci_ha0 || !pvt->pci_sad1 ||
            !pvt->pci_ras  || !pvt->pci_ta || !pvt->info.pci_vtd)
                goto enodev;

        if (saw_chan_mask != 0x0f && /* -EN */
            saw_chan_mask != 0x33 && /* -EP */
            saw_chan_mask != 0xff)   /* -EX */
                goto enodev;
        return 0;

enodev:
        sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
        return -ENODEV;
}

static int broadwell_mci_bind_devs(struct mem_ctl_info *mci,
                                 struct sbridge_dev *sbridge_dev)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        u8 saw_chan_mask = 0;
        int i;

        /* there's only one device per system; not tied to any bus */
        if (pvt->info.pci_vtd == NULL)
                /* result will be checked later */
                pvt->info.pci_vtd = pci_get_device(PCI_VENDOR_ID_INTEL,
                                                   PCI_DEVICE_ID_INTEL_BROADWELL_IMC_VTD_MISC,
                                                   NULL);

        for (i = 0; i < sbridge_dev->n_devs; i++) {
                pdev = sbridge_dev->pdev[i];
                if (!pdev)
                        continue;

                switch (pdev->device) {
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_CBO_SAD0:
                        pvt->pci_sad0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_CBO_SAD1:
                        pvt->pci_sad1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0:
                        pvt->pci_ha0 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TA:
                        pvt->pci_ta = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_THERMAL:
                        pvt->pci_ras = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD0:
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD1:
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD2:
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0_TAD0;
                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD0:
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD1:
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD2:
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD3:
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TAD0 + 4;
                        pvt->pci_tad[id] = pdev;
                        saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_DDRIO0:
                        pvt->pci_ddrio = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1:
                        pvt->pci_ha1 = pdev;
                        break;
                case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA1_TA:
                        pvt->pci_ha1_ta = pdev;
                        break;
                default:
                        break;
                }

                edac_dbg(0, "Associated PCI %02x.%02d.%d with dev = %p\n",
                         sbridge_dev->bus,
                         PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
                         pdev);
        }

        /* Check if everything were registered */
        if (!pvt->pci_sad0 || !pvt->pci_ha0 || !pvt->pci_sad1 ||
            !pvt->pci_ras  || !pvt->pci_ta || !pvt->info.pci_vtd)
                goto enodev;

        if (saw_chan_mask != 0x0f && /* -EN */
            saw_chan_mask != 0x33 && /* -EP */
            saw_chan_mask != 0xff)   /* -EX */
                goto enodev;
        return 0;

enodev:
        sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
        return -ENODEV;
}

static int knl_mci_bind_devs(struct mem_ctl_info *mci,
                        struct sbridge_dev *sbridge_dev)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        int dev, func;

        int i;
        int devidx;

        for (i = 0; i < sbridge_dev->n_devs; i++) {
                pdev = sbridge_dev->pdev[i];
                if (!pdev)
                        continue;

                /* Extract PCI device and function. */
                dev = (pdev->devfn >> 3) & 0x1f;
                func = pdev->devfn & 0x7;

                switch (pdev->device) {
                case PCI_DEVICE_ID_INTEL_KNL_IMC_MC:
                        if (dev == 8)
                                pvt->knl.pci_mc0 = pdev;
                        else if (dev == 9)
                                pvt->knl.pci_mc1 = pdev;
                        else {
                                sbridge_printk(KERN_ERR,
                                        "Memory controller in unexpected place! (dev %d, fn %d)\n",
                                        dev, func);
                                continue;
                        }
                        break;

                case PCI_DEVICE_ID_INTEL_KNL_IMC_SAD0:
                        pvt->pci_sad0 = pdev;
                        break;

                case PCI_DEVICE_ID_INTEL_KNL_IMC_SAD1:
                        pvt->pci_sad1 = pdev;
                        break;

                case PCI_DEVICE_ID_INTEL_KNL_IMC_CHA:
                        /* There are one of these per tile, and range from
                         * 1.14.0 to 1.18.5.
                         */
                        devidx = ((dev-14)*8)+func;

                        if (devidx < 0 || devidx >= KNL_MAX_CHAS) {
                                sbridge_printk(KERN_ERR,
                                        "Caching and Home Agent in unexpected place! (dev %d, fn %d)\n",
                                        dev, func);
                                continue;
                        }

                        WARN_ON(pvt->knl.pci_cha[devidx] != NULL);

                        pvt->knl.pci_cha[devidx] = pdev;
                        break;

                case PCI_DEVICE_ID_INTEL_KNL_IMC_CHANNEL:
                        devidx = -1;

                        /*
                         *  MC0 channels 0-2 are device 9 function 2-4,
                         *  MC1 channels 3-5 are device 8 function 2-4.
                         */

                        if (dev == 9)
                                devidx = func-2;
                        else if (dev == 8)
                                devidx = 3 + (func-2);

                        if (devidx < 0 || devidx >= KNL_MAX_CHANNELS) {
                                sbridge_printk(KERN_ERR,
                                        "DRAM Channel Registers in unexpected place! (dev %d, fn %d)\n",
                                        dev, func);
                                continue;
                        }

                        WARN_ON(pvt->knl.pci_channel[devidx] != NULL);
                        pvt->knl.pci_channel[devidx] = pdev;
                        break;

                case PCI_DEVICE_ID_INTEL_KNL_IMC_TOLHM:
                        pvt->knl.pci_mc_info = pdev;
                        break;

                case PCI_DEVICE_ID_INTEL_KNL_IMC_TA:
                        pvt->pci_ta = pdev;
                        break;

                default:
                        sbridge_printk(KERN_ERR, "Unexpected device %d\n",
                                pdev->device);
                        break;
                }
        }

        if (!pvt->knl.pci_mc0  || !pvt->knl.pci_mc1 ||
            !pvt->pci_sad0     || !pvt->pci_sad1    ||
            !pvt->pci_ta) {
                goto enodev;
        }

        for (i = 0; i < KNL_MAX_CHANNELS; i++) {
                if (!pvt->knl.pci_channel[i]) {
                        sbridge_printk(KERN_ERR, "Missing channel %d\n", i);
                        goto enodev;
                }
        }

        for (i = 0; i < KNL_MAX_CHAS; i++) {
                if (!pvt->knl.pci_cha[i]) {
                        sbridge_printk(KERN_ERR, "Missing CHA %d\n", i);
                        goto enodev;
                }
        }

        return 0;

enodev:
        sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
        return -ENODEV;
}

/****************************************************************************
                        Error check routines
 ****************************************************************************/

/*
 * While Sandy Bridge has error count registers, SMI BIOS read values from
 * and resets the counters. So, they are not reliable for the OS to read
 * from them. So, we have no option but to just trust on whatever MCE is
 * telling us about the errors.
 */
static void sbridge_mce_output_error(struct mem_ctl_info *mci,
                                    const struct mce *m)
{
        struct mem_ctl_info *new_mci;
        struct sbridge_pvt *pvt = mci->pvt_info;
        enum hw_event_mc_err_type tp_event;
        char *type, *optype, msg[256];
        bool ripv = GET_BITFIELD(m->mcgstatus, 0, 0);
        bool overflow = GET_BITFIELD(m->status, 62, 62);
        bool uncorrected_error = GET_BITFIELD(m->status, 61, 61);
        bool recoverable;
        u32 core_err_cnt = GET_BITFIELD(m->status, 38, 52);
        u32 mscod = GET_BITFIELD(m->status, 16, 31);
        u32 errcode = GET_BITFIELD(m->status, 0, 15);
        u32 channel = GET_BITFIELD(m->status, 0, 3);
        u32 optypenum = GET_BITFIELD(m->status, 4, 6);
        long channel_mask, first_channel;
        u8  rank, socket, ha;
        int rc, dimm;
        char *area_type = NULL;

        if (pvt->info.type != SANDY_BRIDGE)
                recoverable = true;
        else
                recoverable = GET_BITFIELD(m->status, 56, 56);

        if (uncorrected_error) {
                if (ripv) {
                        type = "FATAL";
                        tp_event = HW_EVENT_ERR_FATAL;
                } else {
                        type = "NON_FATAL";
                        tp_event = HW_EVENT_ERR_UNCORRECTED;
                }
        } else {
                type = "CORRECTED";
                tp_event = HW_EVENT_ERR_CORRECTED;
        }

        /*
         * According with Table 15-9 of the Intel Architecture spec vol 3A,
         * memory errors should fit in this mask:
         *      000f 0000 1mmm cccc (binary)
         * where:
         *      f = Correction Report Filtering Bit. If 1, subsequent errors
         *          won't be shown
         *      mmm = error type
         *      cccc = channel
         * If the mask doesn't match, report an error to the parsing logic
         */
        if (! ((errcode & 0xef80) == 0x80)) {
                optype = "Can't parse: it is not a mem";
        } else {
                switch (optypenum) {
                case 0:
                        optype = "generic undef request error";
                        break;
                case 1:
                        optype = "memory read error";
                        break;
                case 2:
                        optype = "memory write error";
                        break;
                case 3:
                        optype = "addr/cmd error";
                        break;
                case 4:
                        optype = "memory scrubbing error";
                        break;
                default:
                        optype = "reserved";
                        break;
                }
        }

        /* Only decode errors with an valid address (ADDRV) */
        if (!GET_BITFIELD(m->status, 58, 58))
                return;

        if (pvt->info.type == KNIGHTS_LANDING) {
                if (channel == 14) {
                        edac_dbg(0, "%s%s err_code:%04x:%04x EDRAM bank %d\n",
                                overflow ? " OVERFLOW" : "",
                                (uncorrected_error && recoverable)
                                ? " recoverable" : "",
                                mscod, errcode,
                                m->bank);
                } else {
                        char A = *("A");

                        /*
                         * Reported channel is in range 0-2, so we can't map it
                         * back to mc. To figure out mc we check machine check

                         * bank register that reported this error.
                         * bank15 means mc0 and bank16 means mc1.
                         */
                        channel = knl_channel_remap(m->bank == 16, channel);
                        channel_mask = 1 << channel;

                        snprintf(msg, sizeof(msg),
                                "%s%s err_code:%04x:%04x channel:%d (DIMM_%c)",
                                overflow ? " OVERFLOW" : "",
                                (uncorrected_error && recoverable)
                                ? " recoverable" : " ",
                                mscod, errcode, channel, A + channel);
                        edac_mc_handle_error(tp_event, mci, core_err_cnt,
                                m->addr >> PAGE_SHIFT, m->addr & ~PAGE_MASK, 0,
                                channel, 0, -1,
                                optype, msg);
                }
                return;
        } else {
                rc = get_memory_error_data(mci, m->addr, &socket, &ha,
                                &channel_mask, &rank, &area_type, msg);
        }

        if (rc < 0)
                goto err_parsing;
        new_mci = get_mci_for_node_id(socket);
        if (!new_mci) {
                strcpy(msg, "Error: socket got corrupted!");
                goto err_parsing;
        }
        mci = new_mci;
        pvt = mci->pvt_info;

        first_channel = find_first_bit(&channel_mask, NUM_CHANNELS);

        if (rank < 4)
                dimm = 0;
        else if (rank < 8)
                dimm = 1;
        else
                dimm = 2;


        /*
         * FIXME: On some memory configurations (mirror, lockstep), the
         * Memory Controller can't point the error to a single DIMM. The
         * EDAC core should be handling the channel mask, in order to point
         * to the group of dimm's where the error may be happening.
         */
        if (!pvt->is_lockstep && !pvt->is_mirrored && !pvt->is_close_pg)
                channel = first_channel;

        snprintf(msg, sizeof(msg),
                 "%s%s area:%s err_code:%04x:%04x socket:%d ha:%d channel_mask:%ld rank:%d",
                 overflow ? " OVERFLOW" : "",
                 (uncorrected_error && recoverable) ? " recoverable" : "",
                 area_type,
                 mscod, errcode,
                 socket, ha,
                 channel_mask,
                 rank);

        edac_dbg(0, "%s\n", msg);

        /* FIXME: need support for channel mask */

        if (channel == CHANNEL_UNSPECIFIED)
                channel = -1;

        /* Call the helper to output message */
        edac_mc_handle_error(tp_event, mci, core_err_cnt,
                             m->addr >> PAGE_SHIFT, m->addr & ~PAGE_MASK, 0,
                             4*ha+channel, dimm, -1,
                             optype, msg);
        return;
err_parsing:
        edac_mc_handle_error(tp_event, mci, core_err_cnt, 0, 0, 0,
                             -1, -1, -1,
                             msg, "");

}

/*
 *      sbridge_check_error     Retrieve and process errors reported by the
 *                              hardware. Called by the Core module.
 */
static void sbridge_check_error(struct mem_ctl_info *mci)
{
        struct sbridge_pvt *pvt = mci->pvt_info;
        int i;
        unsigned count = 0;
        struct mce *m;

        /*
         * MCE first step: Copy all mce errors into a temporary buffer
         * We use a double buffering here, to reduce the risk of
         * loosing an error.
         */
        smp_rmb();
        count = (pvt->mce_out + MCE_LOG_LEN - pvt->mce_in)
                % MCE_LOG_LEN;
        if (!count)
                return;

        m = pvt->mce_outentry;
        if (pvt->mce_in + count > MCE_LOG_LEN) {
                unsigned l = MCE_LOG_LEN - pvt->mce_in;

                memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * l);
                smp_wmb();
                pvt->mce_in = 0;
                count -= l;
                m += l;
        }
        memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * count);
        smp_wmb();
        pvt->mce_in += count;

        smp_rmb();
        if (pvt->mce_overrun) {
                sbridge_printk(KERN_ERR, "Lost %d memory errors\n",
                              pvt->mce_overrun);
                smp_wmb();
                pvt->mce_overrun = 0;
        }

        /*
         * MCE second step: parse errors and display
         */
        for (i = 0; i < count; i++)
                sbridge_mce_output_error(mci, &pvt->mce_outentry[i]);
}

/*
 * sbridge_mce_check_error      Replicates mcelog routine to get errors
 *                              This routine simply queues mcelog errors, and
 *                              return. The error itself should be handled later
 *                              by sbridge_check_error.
 * WARNING: As this routine should be called at NMI time, extra care should
 * be taken to avoid deadlocks, and to be as fast as possible.
 */
static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
                                   void *data)
{
        struct mce *mce = (struct mce *)data;
        struct mem_ctl_info *mci;
        struct sbridge_pvt *pvt;
        char *type;

        if (get_edac_report_status() == EDAC_REPORTING_DISABLED)
                return NOTIFY_DONE;

        mci = get_mci_for_node_id(mce->socketid);
        if (!mci)
                return NOTIFY_BAD;
        pvt = mci->pvt_info;

        /*
         * Just let mcelog handle it if the error is
         * outside the memory controller. A memory error
         * is indicated by bit 7 = 1 and bits = 8-11,13-15 = 0.
         * bit 12 has an special meaning.
         */
        if ((mce->status & 0xefff) >> 7 != 1)
                return NOTIFY_DONE;

        if (mce->mcgstatus & MCG_STATUS_MCIP)
                type = "Exception";
        else
                type = "Event";

        sbridge_mc_printk(mci, KERN_DEBUG, "HANDLING MCE MEMORY ERROR\n");

        sbridge_mc_printk(mci, KERN_DEBUG, "CPU %d: Machine Check %s: %Lx "
                          "Bank %d: %016Lx\n", mce->extcpu, type,
                          mce->mcgstatus, mce->bank, mce->status);
        sbridge_mc_printk(mci, KERN_DEBUG, "TSC %llx ", mce->tsc);
        sbridge_mc_printk(mci, KERN_DEBUG, "ADDR %llx ", mce->addr);
        sbridge_mc_printk(mci, KERN_DEBUG, "MISC %llx ", mce->misc);

        sbridge_mc_printk(mci, KERN_DEBUG, "PROCESSOR %u:%x TIME %llu SOCKET "
                          "%u APIC %x\n", mce->cpuvendor, mce->cpuid,
                          mce->time, mce->socketid, mce->apicid);

        smp_rmb();
        if ((pvt->mce_out + 1) % MCE_LOG_LEN == pvt->mce_in) {
                smp_wmb();
                pvt->mce_overrun++;
                return NOTIFY_DONE;
        }

        /* Copy memory error at the ringbuffer */
        memcpy(&pvt->mce_entry[pvt->mce_out], mce, sizeof(*mce));
        smp_wmb();
        pvt->mce_out = (pvt->mce_out + 1) % MCE_LOG_LEN;

        /* Handle fatal errors immediately */
        if (mce->mcgstatus & 1)
                sbridge_check_error(mci);

        /* Advice mcelog that the error were handled */
        return NOTIFY_STOP;
}

static struct notifier_block sbridge_mce_dec = {
        .notifier_call  = sbridge_mce_check_error,
        .priority       = MCE_PRIO_EDAC,
};

/****************************************************************************
                        EDAC register/unregister logic
 ****************************************************************************/

static void sbridge_unregister_mci(struct sbridge_dev *sbridge_dev)
{
        struct mem_ctl_info *mci = sbridge_dev->mci;
        struct sbridge_pvt *pvt;

        if (unlikely(!mci || !mci->pvt_info)) {
                edac_dbg(0, "MC: dev = %p\n", &sbridge_dev->pdev[0]->dev);

                sbridge_printk(KERN_ERR, "Couldn't find mci handler\n");
                return;
        }

        pvt = mci->pvt_info;

        edac_dbg(0, "MC: mci = %p, dev = %p\n",
                 mci, &sbridge_dev->pdev[0]->dev);

        /* Remove MC sysfs nodes */
        edac_mc_del_mc(mci->pdev);

        edac_dbg(1, "%s: free mci struct\n", mci->ctl_name);
        kfree(mci->ctl_name);
        edac_mc_free(mci);
        sbridge_dev->mci = NULL;
}

static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
{
        struct mem_ctl_info *mci;
        struct edac_mc_layer layers[2];
        struct sbridge_pvt *pvt;
        struct pci_dev *pdev = sbridge_dev->pdev[0];
        int rc;

        /* Check the number of active and not disabled channels */
        rc = check_if_ecc_is_active(sbridge_dev->bus, type);
        if (unlikely(rc < 0))
                return rc;

        /* allocate a new MC control structure */
        layers[0].type = EDAC_MC_LAYER_CHANNEL;
        layers[0].size = type == KNIGHTS_LANDING ?
                KNL_MAX_CHANNELS : NUM_CHANNELS;
        layers[0].is_virt_csrow = false;
        layers[1].type = EDAC_MC_LAYER_SLOT;
        layers[1].size = type == KNIGHTS_LANDING ? 1 : MAX_DIMMS;
        layers[1].is_virt_csrow = true;
        mci = edac_mc_alloc(sbridge_dev->mc, ARRAY_SIZE(layers), layers,
                            sizeof(*pvt));

        if (unlikely(!mci))
                return -ENOMEM;

        edac_dbg(0, "MC: mci = %p, dev = %p\n",
                 mci, &pdev->dev);

        pvt = mci->pvt_info;
        memset(pvt, 0, sizeof(*pvt));

        /* Associate sbridge_dev and mci for future usage */
        pvt->sbridge_dev = sbridge_dev;
        sbridge_dev->mci = mci;

        mci->mtype_cap = type == KNIGHTS_LANDING ?
                MEM_FLAG_DDR4 : MEM_FLAG_DDR3;
        mci->edac_ctl_cap = EDAC_FLAG_NONE;
        mci->edac_cap = EDAC_FLAG_NONE;
        mci->mod_name = "sbridge_edac.c";
        mci->mod_ver = SBRIDGE_REVISION;
        mci->dev_name = pci_name(pdev);
        mci->ctl_page_to_phys = NULL;

        /* Set the function pointer to an actual operation function */
        mci->edac_check = sbridge_check_error;

        pvt->info.type = type;
        switch (type) {
        case IVY_BRIDGE:
                pvt->info.rankcfgr = IB_RANK_CFG_A;
                pvt->info.get_tolm = ibridge_get_tolm;
                pvt->info.get_tohm = ibridge_get_tohm;
                pvt->info.dram_rule = ibridge_dram_rule;
                pvt->info.get_memory_type = get_memory_type;
                pvt->info.get_node_id = get_node_id;
                pvt->info.rir_limit = rir_limit;
                pvt->info.sad_limit = sad_limit;
                pvt->info.interleave_mode = interleave_mode;
                pvt->info.show_interleave_mode = show_interleave_mode;
                pvt->info.dram_attr = dram_attr;
                pvt->info.max_sad = ARRAY_SIZE(ibridge_dram_rule);
                pvt->info.interleave_list = ibridge_interleave_list;
                pvt->info.max_interleave = ARRAY_SIZE(ibridge_interleave_list);
                pvt->info.interleave_pkg = ibridge_interleave_pkg;
                pvt->info.get_width = ibridge_get_width;
                mci->ctl_name = kasprintf(GFP_KERNEL, "Ivy Bridge Socket#%d", mci->mc_idx);

                /* Store pci devices at mci for faster access */
                rc = ibridge_mci_bind_devs(mci, sbridge_dev);
                if (unlikely(rc < 0))
                        goto fail0;
                break;
        case SANDY_BRIDGE:
                pvt->info.rankcfgr = SB_RANK_CFG_A;
                pvt->info.get_tolm = sbridge_get_tolm;
                pvt->info.get_tohm = sbridge_get_tohm;
                pvt->info.dram_rule = sbridge_dram_rule;
                pvt->info.get_memory_type = get_memory_type;
                pvt->info.get_node_id = get_node_id;
                pvt->info.rir_limit = rir_limit;
                pvt->info.sad_limit = sad_limit;
                pvt->info.interleave_mode = interleave_mode;
                pvt->info.show_interleave_mode = show_interleave_mode;
                pvt->info.dram_attr = dram_attr;
                pvt->info.max_sad = ARRAY_SIZE(sbridge_dram_rule);
                pvt->info.interleave_list = sbridge_interleave_list;
                pvt->info.max_interleave = ARRAY_SIZE(sbridge_interleave_list);
                pvt->info.interleave_pkg = sbridge_interleave_pkg;
                pvt->info.get_width = sbridge_get_width;
                mci->ctl_name = kasprintf(GFP_KERNEL, "Sandy Bridge Socket#%d", mci->mc_idx);

                /* Store pci devices at mci for faster access */
                rc = sbridge_mci_bind_devs(mci, sbridge_dev);
                if (unlikely(rc < 0))
                        goto fail0;
                break;
        case HASWELL:
                /* rankcfgr isn't used */
                pvt->info.get_tolm = haswell_get_tolm;
                pvt->info.get_tohm = haswell_get_tohm;
                pvt->info.dram_rule = ibridge_dram_rule;
                pvt->info.get_memory_type = haswell_get_memory_type;
                pvt->info.get_node_id = haswell_get_node_id;
                pvt->info.rir_limit = haswell_rir_limit;
                pvt->info.sad_limit = sad_limit;
                pvt->info.interleave_mode = interleave_mode;
                pvt->info.show_interleave_mode = show_interleave_mode;
                pvt->info.dram_attr = dram_attr;
                pvt->info.max_sad = ARRAY_SIZE(ibridge_dram_rule);
                pvt->info.interleave_list = ibridge_interleave_list;
                pvt->info.max_interleave = ARRAY_SIZE(ibridge_interleave_list);
                pvt->info.interleave_pkg = ibridge_interleave_pkg;
                pvt->info.get_width = ibridge_get_width;
                mci->ctl_name = kasprintf(GFP_KERNEL, "Haswell Socket#%d", mci->mc_idx);

                /* Store pci devices at mci for faster access */
                rc = haswell_mci_bind_devs(mci, sbridge_dev);
                if (unlikely(rc < 0))
                        goto fail0;
                break;
        case BROADWELL:
                /* rankcfgr isn't used */
                pvt->info.get_tolm = haswell_get_tolm;
                pvt->info.get_tohm = haswell_get_tohm;
                pvt->info.dram_rule = ibridge_dram_rule;
                pvt->info.get_memory_type = haswell_get_memory_type;
                pvt->info.get_node_id = haswell_get_node_id;
                pvt->info.rir_limit = haswell_rir_limit;
                pvt->info.sad_limit = sad_limit;
                pvt->info.interleave_mode = interleave_mode;
                pvt->info.show_interleave_mode = show_interleave_mode;
                pvt->info.dram_attr = dram_attr;
                pvt->info.max_sad = ARRAY_SIZE(ibridge_dram_rule);
                pvt->info.interleave_list = ibridge_interleave_list;
                pvt->info.max_interleave = ARRAY_SIZE(ibridge_interleave_list);
                pvt->info.interleave_pkg = ibridge_interleave_pkg;
                pvt->info.get_width = broadwell_get_width;
                mci->ctl_name = kasprintf(GFP_KERNEL, "Broadwell Socket#%d", mci->mc_idx);

                /* Store pci devices at mci for faster access */
                rc = broadwell_mci_bind_devs(mci, sbridge_dev);
                if (unlikely(rc < 0))
                        goto fail0;
                break;
        case KNIGHTS_LANDING:
                /* pvt->info.rankcfgr == ??? */
                pvt->info.get_tolm = knl_get_tolm;
                pvt->info.get_tohm = knl_get_tohm;
                pvt->info.dram_rule = knl_dram_rule;
                pvt->info.get_memory_type = knl_get_memory_type;
                pvt->info.get_node_id = knl_get_node_id;
                pvt->info.rir_limit = NULL;
                pvt->info.sad_limit = knl_sad_limit;
                pvt->info.interleave_mode = knl_interleave_mode;
                pvt->info.show_interleave_mode = knl_show_interleave_mode;
                pvt->info.dram_attr = dram_attr_knl;
                pvt->info.max_sad = ARRAY_SIZE(knl_dram_rule);
                pvt->info.interleave_list = knl_interleave_list;
                pvt->info.max_interleave = ARRAY_SIZE(knl_interleave_list);
                pvt->info.interleave_pkg = ibridge_interleave_pkg;
                pvt->info.get_width = knl_get_width;
                mci->ctl_name = kasprintf(GFP_KERNEL,
                        "Knights Landing Socket#%d", mci->mc_idx);

                rc = knl_mci_bind_devs(mci, sbridge_dev);
                if (unlikely(rc < 0))
                        goto fail0;
                break;
        }

        /* Get dimm basic config and the memory layout */
        get_dimm_config(mci);
        get_memory_layout(mci);

        /* record ptr to the generic device */
        mci->pdev = &pdev->dev;

        /* add this new MC control structure to EDAC's list of MCs */
        if (unlikely(edac_mc_add_mc(mci))) {
                edac_dbg(0, "MC: failed edac_mc_add_mc()\n");
                rc = -EINVAL;
                goto fail0;
        }

        return 0;

fail0:
        kfree(mci->ctl_name);
        edac_mc_free(mci);
        sbridge_dev->mci = NULL;
        return rc;
}

#define ICPU(model, table) \
        { X86_VENDOR_INTEL, 6, model, 0, (unsigned long)&table }

static const struct x86_cpu_id sbridge_cpuids[] = {
        ICPU(INTEL_FAM6_SANDYBRIDGE_X,    pci_dev_descr_sbridge_table),
        ICPU(INTEL_FAM6_IVYBRIDGE_X,      pci_dev_descr_ibridge_table),
        ICPU(INTEL_FAM6_HASWELL_X,        pci_dev_descr_haswell_table),
        ICPU(INTEL_FAM6_BROADWELL_X,      pci_dev_descr_broadwell_table),
        ICPU(INTEL_FAM6_BROADWELL_XEON_D, pci_dev_descr_broadwell_table),
        ICPU(INTEL_FAM6_XEON_PHI_KNL,     pci_dev_descr_knl_table),
        ICPU(INTEL_FAM6_XEON_PHI_KNM,     pci_dev_descr_knl_table),
        { }
};
MODULE_DEVICE_TABLE(x86cpu, sbridge_cpuids);

/*
 *      sbridge_probe   Get all devices and register memory controllers
 *                      present.
 *      return:
 *              0 for FOUND a device
 *              < 0 for error code
 */

static int sbridge_probe(const struct x86_cpu_id *id)
{
        int rc = -ENODEV;
        u8 mc, num_mc = 0;
        struct sbridge_dev *sbridge_dev;
        struct pci_id_table *ptable = (struct pci_id_table *)id->driver_data;

        /* get the pci devices we want to reserve for our use */
        rc = sbridge_get_all_devices(&num_mc, ptable);

        if (unlikely(rc < 0)) {
                edac_dbg(0, "couldn't get all devices\n");
                goto fail0;
        }

        mc = 0;

        list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
                edac_dbg(0, "Registering MC#%d (%d of %d)\n",
                         mc, mc + 1, num_mc);

                sbridge_dev->mc = mc++;
                rc = sbridge_register_mci(sbridge_dev, ptable->type);
                if (unlikely(rc < 0))
                        goto fail1;
        }

        sbridge_printk(KERN_INFO, "%s\n", SBRIDGE_REVISION);

        return 0;

fail1:
        list_for_each_entry(sbridge_dev, &sbridge_edac_list, list)
                sbridge_unregister_mci(sbridge_dev);

        sbridge_put_all_devices();
fail0:
        return rc;
}

/*
 *      sbridge_remove  cleanup
 *
 */
static void sbridge_remove(void)
{
        struct sbridge_dev *sbridge_dev;

        edac_dbg(0, "\n");

        list_for_each_entry(sbridge_dev, &sbridge_edac_list, list)
                sbridge_unregister_mci(sbridge_dev);

        /* Release PCI resources */
        sbridge_put_all_devices();
}

/*
 *      sbridge_init            Module entry function
 *                      Try to initialize this module for its devices
 */
static int __init sbridge_init(void)
{
        const struct x86_cpu_id *id;
        int rc;

        edac_dbg(2, "\n");

        id = x86_match_cpu(sbridge_cpuids);
        if (!id)
                return -ENODEV;

        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
        opstate_init();

        rc = sbridge_probe(id);

        if (rc >= 0) {
                mce_register_decode_chain(&sbridge_mce_dec);
                if (get_edac_report_status() == EDAC_REPORTING_DISABLED)
                        sbridge_printk(KERN_WARNING, "Loading driver, error reporting disabled.\n");
                return 0;
        }

        sbridge_printk(KERN_ERR, "Failed to register device with error %d.\n",
                      rc);

        return rc;
}

/*
 *      sbridge_exit()  Module exit function
 *                      Unregister the driver
 */
static void __exit sbridge_exit(void)
{
        edac_dbg(2, "\n");
        sbridge_remove();
        mce_unregister_decode_chain(&sbridge_mce_dec);
}

module_init(sbridge_init);
module_exit(sbridge_exit);

module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("MC Driver for Intel Sandy Bridge and Ivy Bridge memory controllers - "
                   SBRIDGE_REVISION);