Staging: strip: delete the driver

[linux/fpc-iii.git] / drivers / edac / amd64_edac.c

#include "amd64_edac.h"
#include <asm/k8.h>

static struct edac_pci_ctl_info *amd64_ctl_pci;

static int report_gart_errors;
module_param(report_gart_errors, int, 0644);

/*
 * Set by command line parameter. If BIOS has enabled the ECC, this override is
 * cleared to prevent re-enabling the hardware by this driver.
 */
static int ecc_enable_override;
module_param(ecc_enable_override, int, 0644);

static struct msr __percpu *msrs;

/* Lookup table for all possible MC control instances */
struct amd64_pvt;
static struct mem_ctl_info *mci_lookup[EDAC_MAX_NUMNODES];
static struct amd64_pvt *pvt_lookup[EDAC_MAX_NUMNODES];

/*
 * Address to DRAM bank mapping: see F2x80 for K8 and F2x[1,0]80 for Fam10 and
 * later.
 */
static int ddr2_dbam_revCG[] = {
                           [0]          = 32,
                           [1]          = 64,
                           [2]          = 128,
                           [3]          = 256,
                           [4]          = 512,
                           [5]          = 1024,
                           [6]          = 2048,
};

static int ddr2_dbam_revD[] = {
                           [0]          = 32,
                           [1]          = 64,
                           [2 ... 3]    = 128,
                           [4]          = 256,
                           [5]          = 512,
                           [6]          = 256,
                           [7]          = 512,
                           [8 ... 9]    = 1024,
                           [10]         = 2048,
};

static int ddr2_dbam[] = { [0]          = 128,
                           [1]          = 256,
                           [2 ... 4]    = 512,
                           [5 ... 6]    = 1024,
                           [7 ... 8]    = 2048,
                           [9 ... 10]   = 4096,
                           [11]         = 8192,
};

static int ddr3_dbam[] = { [0]          = -1,
                           [1]          = 256,
                           [2]          = 512,
                           [3 ... 4]    = -1,
                           [5 ... 6]    = 1024,
                           [7 ... 8]    = 2048,
                           [9 ... 10]   = 4096,
                           [11] = 8192,
};

/*
 * Valid scrub rates for the K8 hardware memory scrubber. We map the scrubbing
 * bandwidth to a valid bit pattern. The 'set' operation finds the 'matching-
 * or higher value'.
 *
 *FIXME: Produce a better mapping/linearisation.
 */

struct scrubrate scrubrates[] = {
        { 0x01, 1600000000UL},
        { 0x02, 800000000UL},
        { 0x03, 400000000UL},
        { 0x04, 200000000UL},
        { 0x05, 100000000UL},
        { 0x06, 50000000UL},
        { 0x07, 25000000UL},
        { 0x08, 12284069UL},
        { 0x09, 6274509UL},
        { 0x0A, 3121951UL},
        { 0x0B, 1560975UL},
        { 0x0C, 781440UL},
        { 0x0D, 390720UL},
        { 0x0E, 195300UL},
        { 0x0F, 97650UL},
        { 0x10, 48854UL},
        { 0x11, 24427UL},
        { 0x12, 12213UL},
        { 0x13, 6101UL},
        { 0x14, 3051UL},
        { 0x15, 1523UL},
        { 0x16, 761UL},
        { 0x00, 0UL},        /* scrubbing off */
};

/*
 * Memory scrubber control interface. For K8, memory scrubbing is handled by
 * hardware and can involve L2 cache, dcache as well as the main memory. With
 * F10, this is extended to L3 cache scrubbing on CPU models sporting that
 * functionality.
 *
 * This causes the "units" for the scrubbing speed to vary from 64 byte blocks
 * (dram) over to cache lines. This is nasty, so we will use bandwidth in
 * bytes/sec for the setting.
 *
 * Currently, we only do dram scrubbing. If the scrubbing is done in software on
 * other archs, we might not have access to the caches directly.
 */

/*
 * scan the scrub rate mapping table for a close or matching bandwidth value to
 * issue. If requested is too big, then use last maximum value found.
 */
static int amd64_search_set_scrub_rate(struct pci_dev *ctl, u32 new_bw,
                                       u32 min_scrubrate)
{
        u32 scrubval;
        int i;

        /*
         * map the configured rate (new_bw) to a value specific to the AMD64
         * memory controller and apply to register. Search for the first
         * bandwidth entry that is greater or equal than the setting requested
         * and program that. If at last entry, turn off DRAM scrubbing.
         */
        for (i = 0; i < ARRAY_SIZE(scrubrates); i++) {
                /*
                 * skip scrub rates which aren't recommended
                 * (see F10 BKDG, F3x58)
                 */
                if (scrubrates[i].scrubval < min_scrubrate)
                        continue;

                if (scrubrates[i].bandwidth <= new_bw)
                        break;

                /*
                 * if no suitable bandwidth found, turn off DRAM scrubbing
                 * entirely by falling back to the last element in the
                 * scrubrates array.
                 */
        }

        scrubval = scrubrates[i].scrubval;
        if (scrubval)
                edac_printk(KERN_DEBUG, EDAC_MC,
                            "Setting scrub rate bandwidth: %u\n",
                            scrubrates[i].bandwidth);
        else
                edac_printk(KERN_DEBUG, EDAC_MC, "Turning scrubbing off.\n");

        pci_write_bits32(ctl, K8_SCRCTRL, scrubval, 0x001F);

        return 0;
}

static int amd64_set_scrub_rate(struct mem_ctl_info *mci, u32 *bandwidth)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 min_scrubrate = 0x0;

        switch (boot_cpu_data.x86) {
        case 0xf:
                min_scrubrate = K8_MIN_SCRUB_RATE_BITS;
                break;
        case 0x10:
                min_scrubrate = F10_MIN_SCRUB_RATE_BITS;
                break;
        case 0x11:
                min_scrubrate = F11_MIN_SCRUB_RATE_BITS;
                break;

        default:
                amd64_printk(KERN_ERR, "Unsupported family!\n");
                break;
        }
        return amd64_search_set_scrub_rate(pvt->misc_f3_ctl, *bandwidth,
                        min_scrubrate);
}

static int amd64_get_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 scrubval = 0;
        int status = -1, i;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_SCRCTRL, &scrubval);

        scrubval = scrubval & 0x001F;

        edac_printk(KERN_DEBUG, EDAC_MC,
                    "pci-read, sdram scrub control value: %d \n", scrubval);

        for (i = 0; i < ARRAY_SIZE(scrubrates); i++) {
                if (scrubrates[i].scrubval == scrubval) {
                        *bw = scrubrates[i].bandwidth;
                        status = 0;
                        break;
                }
        }

        return status;
}

/* Map from a CSROW entry to the mask entry that operates on it */
static inline u32 amd64_map_to_dcs_mask(struct amd64_pvt *pvt, int csrow)
{
        if (boot_cpu_data.x86 == 0xf && pvt->ext_model < K8_REV_F)
                return csrow;
        else
                return csrow >> 1;
}

/* return the 'base' address the i'th CS entry of the 'dct' DRAM controller */
static u32 amd64_get_dct_base(struct amd64_pvt *pvt, int dct, int csrow)
{
        if (dct == 0)
                return pvt->dcsb0[csrow];
        else
                return pvt->dcsb1[csrow];
}

/*
 * Return the 'mask' address the i'th CS entry. This function is needed because
 * there number of DCSM registers on Rev E and prior vs Rev F and later is
 * different.
 */
static u32 amd64_get_dct_mask(struct amd64_pvt *pvt, int dct, int csrow)
{
        if (dct == 0)
                return pvt->dcsm0[amd64_map_to_dcs_mask(pvt, csrow)];
        else
                return pvt->dcsm1[amd64_map_to_dcs_mask(pvt, csrow)];
}


/*
 * In *base and *limit, pass back the full 40-bit base and limit physical
 * addresses for the node given by node_id.  This information is obtained from
 * DRAM Base (section 3.4.4.1) and DRAM Limit (section 3.4.4.2) registers. The
 * base and limit addresses are of type SysAddr, as defined at the start of
 * section 3.4.4 (p. 70).  They are the lowest and highest physical addresses
 * in the address range they represent.
 */
static void amd64_get_base_and_limit(struct amd64_pvt *pvt, int node_id,
                               u64 *base, u64 *limit)
{
        *base = pvt->dram_base[node_id];
        *limit = pvt->dram_limit[node_id];
}

/*
 * Return 1 if the SysAddr given by sys_addr matches the base/limit associated
 * with node_id
 */
static int amd64_base_limit_match(struct amd64_pvt *pvt,
                                        u64 sys_addr, int node_id)
{
        u64 base, limit, addr;

        amd64_get_base_and_limit(pvt, node_id, &base, &limit);

        /* The K8 treats this as a 40-bit value.  However, bits 63-40 will be
         * all ones if the most significant implemented address bit is 1.
         * Here we discard bits 63-40.  See section 3.4.2 of AMD publication
         * 24592: AMD x86-64 Architecture Programmer's Manual Volume 1
         * Application Programming.
         */
        addr = sys_addr & 0x000000ffffffffffull;

        return (addr >= base) && (addr <= limit);
}

/*
 * Attempt to map a SysAddr to a node. On success, return a pointer to the
 * mem_ctl_info structure for the node that the SysAddr maps to.
 *
 * On failure, return NULL.
 */
static struct mem_ctl_info *find_mc_by_sys_addr(struct mem_ctl_info *mci,
                                                u64 sys_addr)
{
        struct amd64_pvt *pvt;
        int node_id;
        u32 intlv_en, bits;

        /*
         * Here we use the DRAM Base (section 3.4.4.1) and DRAM Limit (section
         * 3.4.4.2) registers to map the SysAddr to a node ID.
         */
        pvt = mci->pvt_info;

        /*
         * The value of this field should be the same for all DRAM Base
         * registers.  Therefore we arbitrarily choose to read it from the
         * register for node 0.
         */
        intlv_en = pvt->dram_IntlvEn[0];

        if (intlv_en == 0) {
                for (node_id = 0; node_id < DRAM_REG_COUNT; node_id++) {
                        if (amd64_base_limit_match(pvt, sys_addr, node_id))
                                goto found;
                }
                goto err_no_match;
        }

        if (unlikely((intlv_en != 0x01) &&
                     (intlv_en != 0x03) &&
                     (intlv_en != 0x07))) {
                amd64_printk(KERN_WARNING, "junk value of 0x%x extracted from "
                             "IntlvEn field of DRAM Base Register for node 0: "
                             "this probably indicates a BIOS bug.\n", intlv_en);
                return NULL;
        }

        bits = (((u32) sys_addr) >> 12) & intlv_en;

        for (node_id = 0; ; ) {
                if ((pvt->dram_IntlvSel[node_id] & intlv_en) == bits)
                        break;  /* intlv_sel field matches */

                if (++node_id >= DRAM_REG_COUNT)
                        goto err_no_match;
        }

        /* sanity test for sys_addr */
        if (unlikely(!amd64_base_limit_match(pvt, sys_addr, node_id))) {
                amd64_printk(KERN_WARNING,
                             "%s(): sys_addr 0x%llx falls outside base/limit "
                             "address range for node %d with node interleaving "
                             "enabled.\n",
                             __func__, sys_addr, node_id);
                return NULL;
        }

found:
        return edac_mc_find(node_id);

err_no_match:
        debugf2("sys_addr 0x%lx doesn't match any node\n",
                (unsigned long)sys_addr);

        return NULL;
}

/*
 * Extract the DRAM CS base address from selected csrow register.
 */
static u64 base_from_dct_base(struct amd64_pvt *pvt, int csrow)
{
        return ((u64) (amd64_get_dct_base(pvt, 0, csrow) & pvt->dcsb_base)) <<
                                pvt->dcs_shift;
}

/*
 * Extract the mask from the dcsb0[csrow] entry in a CPU revision-specific way.
 */
static u64 mask_from_dct_mask(struct amd64_pvt *pvt, int csrow)
{
        u64 dcsm_bits, other_bits;
        u64 mask;

        /* Extract bits from DRAM CS Mask. */
        dcsm_bits = amd64_get_dct_mask(pvt, 0, csrow) & pvt->dcsm_mask;

        other_bits = pvt->dcsm_mask;
        other_bits = ~(other_bits << pvt->dcs_shift);

        /*
         * The extracted bits from DCSM belong in the spaces represented by
         * the cleared bits in other_bits.
         */
        mask = (dcsm_bits << pvt->dcs_shift) | other_bits;

        return mask;
}

/*
 * @input_addr is an InputAddr associated with the node given by mci. Return the
 * csrow that input_addr maps to, or -1 on failure (no csrow claims input_addr).
 */
static int input_addr_to_csrow(struct mem_ctl_info *mci, u64 input_addr)
{
        struct amd64_pvt *pvt;
        int csrow;
        u64 base, mask;

        pvt = mci->pvt_info;

        /*
         * Here we use the DRAM CS Base and DRAM CS Mask registers. For each CS
         * base/mask register pair, test the condition shown near the start of
         * section 3.5.4 (p. 84, BKDG #26094, K8, revA-E).
         */
        for (csrow = 0; csrow < pvt->cs_count; csrow++) {

                /* This DRAM chip select is disabled on this node */
                if ((pvt->dcsb0[csrow] & K8_DCSB_CS_ENABLE) == 0)
                        continue;

                base = base_from_dct_base(pvt, csrow);
                mask = ~mask_from_dct_mask(pvt, csrow);

                if ((input_addr & mask) == (base & mask)) {
                        debugf2("InputAddr 0x%lx matches csrow %d (node %d)\n",
                                (unsigned long)input_addr, csrow,
                                pvt->mc_node_id);

                        return csrow;
                }
        }

        debugf2("no matching csrow for InputAddr 0x%lx (MC node %d)\n",
                (unsigned long)input_addr, pvt->mc_node_id);

        return -1;
}

/*
 * Return the base value defined by the DRAM Base register for the node
 * represented by mci.  This function returns the full 40-bit value despite the
 * fact that the register only stores bits 39-24 of the value. See section
 * 3.4.4.1 (BKDG #26094, K8, revA-E)
 */
static inline u64 get_dram_base(struct mem_ctl_info *mci)
{
        struct amd64_pvt *pvt = mci->pvt_info;

        return pvt->dram_base[pvt->mc_node_id];
}

/*
 * Obtain info from the DRAM Hole Address Register (section 3.4.8, pub #26094)
 * for the node represented by mci. Info is passed back in *hole_base,
 * *hole_offset, and *hole_size.  Function returns 0 if info is valid or 1 if
 * info is invalid. Info may be invalid for either of the following reasons:
 *
 * - The revision of the node is not E or greater.  In this case, the DRAM Hole
 *   Address Register does not exist.
 *
 * - The DramHoleValid bit is cleared in the DRAM Hole Address Register,
 *   indicating that its contents are not valid.
 *
 * The values passed back in *hole_base, *hole_offset, and *hole_size are
 * complete 32-bit values despite the fact that the bitfields in the DHAR
 * only represent bits 31-24 of the base and offset values.
 */
int amd64_get_dram_hole_info(struct mem_ctl_info *mci, u64 *hole_base,
                             u64 *hole_offset, u64 *hole_size)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u64 base;

        /* only revE and later have the DRAM Hole Address Register */
        if (boot_cpu_data.x86 == 0xf && pvt->ext_model < K8_REV_E) {
                debugf1("  revision %d for node %d does not support DHAR\n",
                        pvt->ext_model, pvt->mc_node_id);
                return 1;
        }

        /* only valid for Fam10h */
        if (boot_cpu_data.x86 == 0x10 &&
            (pvt->dhar & F10_DRAM_MEM_HOIST_VALID) == 0) {
                debugf1("  Dram Memory Hoisting is DISABLED on this system\n");
                return 1;
        }

        if ((pvt->dhar & DHAR_VALID) == 0) {
                debugf1("  Dram Memory Hoisting is DISABLED on this node %d\n",
                        pvt->mc_node_id);
                return 1;
        }

        /* This node has Memory Hoisting */

        /* +------------------+--------------------+--------------------+-----
         * | memory           | DRAM hole          | relocated          |
         * | [0, (x - 1)]     | [x, 0xffffffff]    | addresses from     |
         * |                  |                    | DRAM hole          |
         * |                  |                    | [0x100000000,      |
         * |                  |                    |  (0x100000000+     |
         * |                  |                    |   (0xffffffff-x))] |
         * +------------------+--------------------+--------------------+-----
         *
         * Above is a diagram of physical memory showing the DRAM hole and the
         * relocated addresses from the DRAM hole.  As shown, the DRAM hole
         * starts at address x (the base address) and extends through address
         * 0xffffffff.  The DRAM Hole Address Register (DHAR) relocates the
         * addresses in the hole so that they start at 0x100000000.
         */

        base = dhar_base(pvt->dhar);

        *hole_base = base;
        *hole_size = (0x1ull << 32) - base;

        if (boot_cpu_data.x86 > 0xf)
                *hole_offset = f10_dhar_offset(pvt->dhar);
        else
                *hole_offset = k8_dhar_offset(pvt->dhar);

        debugf1("  DHAR info for node %d base 0x%lx offset 0x%lx size 0x%lx\n",
                pvt->mc_node_id, (unsigned long)*hole_base,
                (unsigned long)*hole_offset, (unsigned long)*hole_size);

        return 0;
}
EXPORT_SYMBOL_GPL(amd64_get_dram_hole_info);

/*
 * Return the DramAddr that the SysAddr given by @sys_addr maps to.  It is
 * assumed that sys_addr maps to the node given by mci.
 *
 * The first part of section 3.4.4 (p. 70) shows how the DRAM Base (section
 * 3.4.4.1) and DRAM Limit (section 3.4.4.2) registers are used to translate a
 * SysAddr to a DramAddr. If the DRAM Hole Address Register (DHAR) is enabled,
 * then it is also involved in translating a SysAddr to a DramAddr. Sections
 * 3.4.8 and 3.5.8.2 describe the DHAR and how it is used for memory hoisting.
 * These parts of the documentation are unclear. I interpret them as follows:
 *
 * When node n receives a SysAddr, it processes the SysAddr as follows:
 *
 * 1. It extracts the DRAMBase and DRAMLimit values from the DRAM Base and DRAM
 *    Limit registers for node n. If the SysAddr is not within the range
 *    specified by the base and limit values, then node n ignores the Sysaddr
 *    (since it does not map to node n). Otherwise continue to step 2 below.
 *
 * 2. If the DramHoleValid bit of the DHAR for node n is clear, the DHAR is
 *    disabled so skip to step 3 below. Otherwise see if the SysAddr is within
 *    the range of relocated addresses (starting at 0x100000000) from the DRAM
 *    hole. If not, skip to step 3 below. Else get the value of the
 *    DramHoleOffset field from the DHAR. To obtain the DramAddr, subtract the
 *    offset defined by this value from the SysAddr.
 *
 * 3. Obtain the base address for node n from the DRAMBase field of the DRAM
 *    Base register for node n. To obtain the DramAddr, subtract the base
 *    address from the SysAddr, as shown near the start of section 3.4.4 (p.70).
 */
static u64 sys_addr_to_dram_addr(struct mem_ctl_info *mci, u64 sys_addr)
{
        u64 dram_base, hole_base, hole_offset, hole_size, dram_addr;
        int ret = 0;

        dram_base = get_dram_base(mci);

        ret = amd64_get_dram_hole_info(mci, &hole_base, &hole_offset,
                                      &hole_size);
        if (!ret) {
                if ((sys_addr >= (1ull << 32)) &&
                    (sys_addr < ((1ull << 32) + hole_size))) {
                        /* use DHAR to translate SysAddr to DramAddr */
                        dram_addr = sys_addr - hole_offset;

                        debugf2("using DHAR to translate SysAddr 0x%lx to "
                                "DramAddr 0x%lx\n",
                                (unsigned long)sys_addr,
                                (unsigned long)dram_addr);

                        return dram_addr;
                }
        }

        /*
         * Translate the SysAddr to a DramAddr as shown near the start of
         * section 3.4.4 (p. 70).  Although sys_addr is a 64-bit value, the k8
         * only deals with 40-bit values.  Therefore we discard bits 63-40 of
         * sys_addr below.  If bit 39 of sys_addr is 1 then the bits we
         * discard are all 1s.  Otherwise the bits we discard are all 0s.  See
         * section 3.4.2 of AMD publication 24592: AMD x86-64 Architecture
         * Programmer's Manual Volume 1 Application Programming.
         */
        dram_addr = (sys_addr & 0xffffffffffull) - dram_base;

        debugf2("using DRAM Base register to translate SysAddr 0x%lx to "
                "DramAddr 0x%lx\n", (unsigned long)sys_addr,
                (unsigned long)dram_addr);
        return dram_addr;
}

/*
 * @intlv_en is the value of the IntlvEn field from a DRAM Base register
 * (section 3.4.4.1).  Return the number of bits from a SysAddr that are used
 * for node interleaving.
 */
static int num_node_interleave_bits(unsigned intlv_en)
{
        static const int intlv_shift_table[] = { 0, 1, 0, 2, 0, 0, 0, 3 };
        int n;

        BUG_ON(intlv_en > 7);
        n = intlv_shift_table[intlv_en];
        return n;
}

/* Translate the DramAddr given by @dram_addr to an InputAddr. */
static u64 dram_addr_to_input_addr(struct mem_ctl_info *mci, u64 dram_addr)
{
        struct amd64_pvt *pvt;
        int intlv_shift;
        u64 input_addr;

        pvt = mci->pvt_info;

        /*
         * See the start of section 3.4.4 (p. 70, BKDG #26094, K8, revA-E)
         * concerning translating a DramAddr to an InputAddr.
         */
        intlv_shift = num_node_interleave_bits(pvt->dram_IntlvEn[0]);
        input_addr = ((dram_addr >> intlv_shift) & 0xffffff000ull) +
            (dram_addr & 0xfff);

        debugf2("  Intlv Shift=%d DramAddr=0x%lx maps to InputAddr=0x%lx\n",
                intlv_shift, (unsigned long)dram_addr,
                (unsigned long)input_addr);

        return input_addr;
}

/*
 * Translate the SysAddr represented by @sys_addr to an InputAddr.  It is
 * assumed that @sys_addr maps to the node given by mci.
 */
static u64 sys_addr_to_input_addr(struct mem_ctl_info *mci, u64 sys_addr)
{
        u64 input_addr;

        input_addr =
            dram_addr_to_input_addr(mci, sys_addr_to_dram_addr(mci, sys_addr));

        debugf2("SysAdddr 0x%lx translates to InputAddr 0x%lx\n",
                (unsigned long)sys_addr, (unsigned long)input_addr);

        return input_addr;
}


/*
 * @input_addr is an InputAddr associated with the node represented by mci.
 * Translate @input_addr to a DramAddr and return the result.
 */
static u64 input_addr_to_dram_addr(struct mem_ctl_info *mci, u64 input_addr)
{
        struct amd64_pvt *pvt;
        int node_id, intlv_shift;
        u64 bits, dram_addr;
        u32 intlv_sel;

        /*
         * Near the start of section 3.4.4 (p. 70, BKDG #26094, K8, revA-E)
         * shows how to translate a DramAddr to an InputAddr. Here we reverse
         * this procedure. When translating from a DramAddr to an InputAddr, the
         * bits used for node interleaving are discarded.  Here we recover these
         * bits from the IntlvSel field of the DRAM Limit register (section
         * 3.4.4.2) for the node that input_addr is associated with.
         */
        pvt = mci->pvt_info;
        node_id = pvt->mc_node_id;
        BUG_ON((node_id < 0) || (node_id > 7));

        intlv_shift = num_node_interleave_bits(pvt->dram_IntlvEn[0]);

        if (intlv_shift == 0) {
                debugf1("    InputAddr 0x%lx translates to DramAddr of "
                        "same value\n", (unsigned long)input_addr);

                return input_addr;
        }

        bits = ((input_addr & 0xffffff000ull) << intlv_shift) +
            (input_addr & 0xfff);

        intlv_sel = pvt->dram_IntlvSel[node_id] & ((1 << intlv_shift) - 1);
        dram_addr = bits + (intlv_sel << 12);

        debugf1("InputAddr 0x%lx translates to DramAddr 0x%lx "
                "(%d node interleave bits)\n", (unsigned long)input_addr,
                (unsigned long)dram_addr, intlv_shift);

        return dram_addr;
}

/*
 * @dram_addr is a DramAddr that maps to the node represented by mci. Convert
 * @dram_addr to a SysAddr.
 */
static u64 dram_addr_to_sys_addr(struct mem_ctl_info *mci, u64 dram_addr)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u64 hole_base, hole_offset, hole_size, base, limit, sys_addr;
        int ret = 0;

        ret = amd64_get_dram_hole_info(mci, &hole_base, &hole_offset,
                                      &hole_size);
        if (!ret) {
                if ((dram_addr >= hole_base) &&
                    (dram_addr < (hole_base + hole_size))) {
                        sys_addr = dram_addr + hole_offset;

                        debugf1("using DHAR to translate DramAddr 0x%lx to "
                                "SysAddr 0x%lx\n", (unsigned long)dram_addr,
                                (unsigned long)sys_addr);

                        return sys_addr;
                }
        }

        amd64_get_base_and_limit(pvt, pvt->mc_node_id, &base, &limit);
        sys_addr = dram_addr + base;

        /*
         * The sys_addr we have computed up to this point is a 40-bit value
         * because the k8 deals with 40-bit values.  However, the value we are
         * supposed to return is a full 64-bit physical address.  The AMD
         * x86-64 architecture specifies that the most significant implemented
         * address bit through bit 63 of a physical address must be either all
         * 0s or all 1s.  Therefore we sign-extend the 40-bit sys_addr to a
         * 64-bit value below.  See section 3.4.2 of AMD publication 24592:
         * AMD x86-64 Architecture Programmer's Manual Volume 1 Application
         * Programming.
         */
        sys_addr |= ~((sys_addr & (1ull << 39)) - 1);

        debugf1("    Node %d, DramAddr 0x%lx to SysAddr 0x%lx\n",
                pvt->mc_node_id, (unsigned long)dram_addr,
                (unsigned long)sys_addr);

        return sys_addr;
}

/*
 * @input_addr is an InputAddr associated with the node given by mci. Translate
 * @input_addr to a SysAddr.
 */
static inline u64 input_addr_to_sys_addr(struct mem_ctl_info *mci,
                                         u64 input_addr)
{
        return dram_addr_to_sys_addr(mci,
                                     input_addr_to_dram_addr(mci, input_addr));
}

/*
 * Find the minimum and maximum InputAddr values that map to the given @csrow.
 * Pass back these values in *input_addr_min and *input_addr_max.
 */
static void find_csrow_limits(struct mem_ctl_info *mci, int csrow,
                              u64 *input_addr_min, u64 *input_addr_max)
{
        struct amd64_pvt *pvt;
        u64 base, mask;

        pvt = mci->pvt_info;
        BUG_ON((csrow < 0) || (csrow >= pvt->cs_count));

        base = base_from_dct_base(pvt, csrow);
        mask = mask_from_dct_mask(pvt, csrow);

        *input_addr_min = base & ~mask;
        *input_addr_max = base | mask | pvt->dcs_mask_notused;
}

/* Map the Error address to a PAGE and PAGE OFFSET. */
static inline void error_address_to_page_and_offset(u64 error_address,
                                                    u32 *page, u32 *offset)
{
        *page = (u32) (error_address >> PAGE_SHIFT);
        *offset = ((u32) error_address) & ~PAGE_MASK;
}

/*
 * @sys_addr is an error address (a SysAddr) extracted from the MCA NB Address
 * Low (section 3.6.4.5) and MCA NB Address High (section 3.6.4.6) registers
 * of a node that detected an ECC memory error.  mci represents the node that
 * the error address maps to (possibly different from the node that detected
 * the error).  Return the number of the csrow that sys_addr maps to, or -1 on
 * error.
 */
static int sys_addr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr)
{
        int csrow;

        csrow = input_addr_to_csrow(mci, sys_addr_to_input_addr(mci, sys_addr));

        if (csrow == -1)
                amd64_mc_printk(mci, KERN_ERR,
                             "Failed to translate InputAddr to csrow for "
                             "address 0x%lx\n", (unsigned long)sys_addr);
        return csrow;
}

static int get_channel_from_ecc_syndrome(struct mem_ctl_info *, u16);

static void amd64_cpu_display_info(struct amd64_pvt *pvt)
{
        if (boot_cpu_data.x86 == 0x11)
                edac_printk(KERN_DEBUG, EDAC_MC, "F11h CPU detected\n");
        else if (boot_cpu_data.x86 == 0x10)
                edac_printk(KERN_DEBUG, EDAC_MC, "F10h CPU detected\n");
        else if (boot_cpu_data.x86 == 0xf)
                edac_printk(KERN_DEBUG, EDAC_MC, "%s detected\n",
                        (pvt->ext_model >= K8_REV_F) ?
                        "Rev F or later" : "Rev E or earlier");
        else
                /* we'll hardly ever ever get here */
                edac_printk(KERN_ERR, EDAC_MC, "Unknown cpu!\n");
}

/*
 * Determine if the DIMMs have ECC enabled. ECC is enabled ONLY if all the DIMMs
 * are ECC capable.
 */
static enum edac_type amd64_determine_edac_cap(struct amd64_pvt *pvt)
{
        int bit;
        enum dev_type edac_cap = EDAC_FLAG_NONE;

        bit = (boot_cpu_data.x86 > 0xf || pvt->ext_model >= K8_REV_F)
                ? 19
                : 17;

        if (pvt->dclr0 & BIT(bit))
                edac_cap = EDAC_FLAG_SECDED;

        return edac_cap;
}


static void amd64_debug_display_dimm_sizes(int ctrl, struct amd64_pvt *pvt);

static void amd64_dump_dramcfg_low(u32 dclr, int chan)
{
        debugf1("F2x%d90 (DRAM Cfg Low): 0x%08x\n", chan, dclr);

        debugf1("  DIMM type: %sbuffered; all DIMMs support ECC: %s\n",
                (dclr & BIT(16)) ?  "un" : "",
                (dclr & BIT(19)) ? "yes" : "no");

        debugf1("  PAR/ERR parity: %s\n",
                (dclr & BIT(8)) ?  "enabled" : "disabled");

        debugf1("  DCT 128bit mode width: %s\n",
                (dclr & BIT(11)) ?  "128b" : "64b");

        debugf1("  x4 logical DIMMs present: L0: %s L1: %s L2: %s L3: %s\n",
                (dclr & BIT(12)) ?  "yes" : "no",
                (dclr & BIT(13)) ?  "yes" : "no",
                (dclr & BIT(14)) ?  "yes" : "no",
                (dclr & BIT(15)) ?  "yes" : "no");
}

/* Display and decode various NB registers for debug purposes. */
static void amd64_dump_misc_regs(struct amd64_pvt *pvt)
{
        int ganged;

        debugf1("F3xE8 (NB Cap): 0x%08x\n", pvt->nbcap);

        debugf1("  NB two channel DRAM capable: %s\n",
                (pvt->nbcap & K8_NBCAP_DCT_DUAL) ? "yes" : "no");

        debugf1("  ECC capable: %s, ChipKill ECC capable: %s\n",
                (pvt->nbcap & K8_NBCAP_SECDED) ? "yes" : "no",
                (pvt->nbcap & K8_NBCAP_CHIPKILL) ? "yes" : "no");

        amd64_dump_dramcfg_low(pvt->dclr0, 0);

        debugf1("F3xB0 (Online Spare): 0x%08x\n", pvt->online_spare);

        debugf1("F1xF0 (DRAM Hole Address): 0x%08x, base: 0x%08x, "
                        "offset: 0x%08x\n",
                        pvt->dhar,
                        dhar_base(pvt->dhar),
                        (boot_cpu_data.x86 == 0xf) ? k8_dhar_offset(pvt->dhar)
                                                   : f10_dhar_offset(pvt->dhar));

        debugf1("  DramHoleValid: %s\n",
                (pvt->dhar & DHAR_VALID) ? "yes" : "no");

        /* everything below this point is Fam10h and above */
        if (boot_cpu_data.x86 == 0xf) {
                amd64_debug_display_dimm_sizes(0, pvt);
                return;
        }

        /* Only if NOT ganged does dclr1 have valid info */
        if (!dct_ganging_enabled(pvt))
                amd64_dump_dramcfg_low(pvt->dclr1, 1);

        /*
         * Determine if ganged and then dump memory sizes for first controller,
         * and if NOT ganged dump info for 2nd controller.
         */
        ganged = dct_ganging_enabled(pvt);

        amd64_debug_display_dimm_sizes(0, pvt);

        if (!ganged)
                amd64_debug_display_dimm_sizes(1, pvt);
}

/* Read in both of DBAM registers */
static void amd64_read_dbam_reg(struct amd64_pvt *pvt)
{
        amd64_read_pci_cfg(pvt->dram_f2_ctl, DBAM0, &pvt->dbam0);

        if (boot_cpu_data.x86 >= 0x10)
                amd64_read_pci_cfg(pvt->dram_f2_ctl, DBAM1, &pvt->dbam1);
}

/*
 * NOTE: CPU Revision Dependent code: Rev E and Rev F
 *
 * Set the DCSB and DCSM mask values depending on the CPU revision value. Also
 * set the shift factor for the DCSB and DCSM values.
 *
 * ->dcs_mask_notused, RevE:
 *
 * To find the max InputAddr for the csrow, start with the base address and set
 * all bits that are "don't care" bits in the test at the start of section
 * 3.5.4 (p. 84).
 *
 * The "don't care" bits are all set bits in the mask and all bits in the gaps
 * between bit ranges [35:25] and [19:13]. The value REV_E_DCS_NOTUSED_BITS
 * represents bits [24:20] and [12:0], which are all bits in the above-mentioned
 * gaps.
 *
 * ->dcs_mask_notused, RevF and later:
 *
 * To find the max InputAddr for the csrow, start with the base address and set
 * all bits that are "don't care" bits in the test at the start of NPT section
 * 4.5.4 (p. 87).
 *
 * The "don't care" bits are all set bits in the mask and all bits in the gaps
 * between bit ranges [36:27] and [21:13].
 *
 * The value REV_F_F1Xh_DCS_NOTUSED_BITS represents bits [26:22] and [12:0],
 * which are all bits in the above-mentioned gaps.
 */
static void amd64_set_dct_base_and_mask(struct amd64_pvt *pvt)
{

        if (boot_cpu_data.x86 == 0xf && pvt->ext_model < K8_REV_F) {
                pvt->dcsb_base          = REV_E_DCSB_BASE_BITS;
                pvt->dcsm_mask          = REV_E_DCSM_MASK_BITS;
                pvt->dcs_mask_notused   = REV_E_DCS_NOTUSED_BITS;
                pvt->dcs_shift          = REV_E_DCS_SHIFT;
                pvt->cs_count           = 8;
                pvt->num_dcsm           = 8;
        } else {
                pvt->dcsb_base          = REV_F_F1Xh_DCSB_BASE_BITS;
                pvt->dcsm_mask          = REV_F_F1Xh_DCSM_MASK_BITS;
                pvt->dcs_mask_notused   = REV_F_F1Xh_DCS_NOTUSED_BITS;
                pvt->dcs_shift          = REV_F_F1Xh_DCS_SHIFT;

                if (boot_cpu_data.x86 == 0x11) {
                        pvt->cs_count = 4;
                        pvt->num_dcsm = 2;
                } else {
                        pvt->cs_count = 8;
                        pvt->num_dcsm = 4;
                }
        }
}

/*
 * Function 2 Offset F10_DCSB0; read in the DCS Base and DCS Mask hw registers
 */
static void amd64_read_dct_base_mask(struct amd64_pvt *pvt)
{
        int cs, reg;

        amd64_set_dct_base_and_mask(pvt);

        for (cs = 0; cs < pvt->cs_count; cs++) {
                reg = K8_DCSB0 + (cs * 4);
                if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg, &pvt->dcsb0[cs]))
                        debugf0("  DCSB0[%d]=0x%08x reg: F2x%x\n",
                                cs, pvt->dcsb0[cs], reg);

                /* If DCT are NOT ganged, then read in DCT1's base */
                if (boot_cpu_data.x86 >= 0x10 && !dct_ganging_enabled(pvt)) {
                        reg = F10_DCSB1 + (cs * 4);
                        if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg,
                                                &pvt->dcsb1[cs]))
                                debugf0("  DCSB1[%d]=0x%08x reg: F2x%x\n",
                                        cs, pvt->dcsb1[cs], reg);
                } else {
                        pvt->dcsb1[cs] = 0;
                }
        }

        for (cs = 0; cs < pvt->num_dcsm; cs++) {
                reg = K8_DCSM0 + (cs * 4);
                if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg, &pvt->dcsm0[cs]))
                        debugf0("    DCSM0[%d]=0x%08x reg: F2x%x\n",
                                cs, pvt->dcsm0[cs], reg);

                /* If DCT are NOT ganged, then read in DCT1's mask */
                if (boot_cpu_data.x86 >= 0x10 && !dct_ganging_enabled(pvt)) {
                        reg = F10_DCSM1 + (cs * 4);
                        if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg,
                                                &pvt->dcsm1[cs]))
                                debugf0("    DCSM1[%d]=0x%08x reg: F2x%x\n",
                                        cs, pvt->dcsm1[cs], reg);
                } else {
                        pvt->dcsm1[cs] = 0;
                }
        }
}

static enum mem_type amd64_determine_memory_type(struct amd64_pvt *pvt)
{
        enum mem_type type;

        if (boot_cpu_data.x86 >= 0x10 || pvt->ext_model >= K8_REV_F) {
                if (pvt->dchr0 & DDR3_MODE)
                        type = (pvt->dclr0 & BIT(16)) ? MEM_DDR3 : MEM_RDDR3;
                else
                        type = (pvt->dclr0 & BIT(16)) ? MEM_DDR2 : MEM_RDDR2;
        } else {
                type = (pvt->dclr0 & BIT(18)) ? MEM_DDR : MEM_RDDR;
        }

        debugf1("  Memory type is: %s\n", edac_mem_types[type]);

        return type;
}

/*
 * Read the DRAM Configuration Low register. It differs between CG, D & E revs
 * and the later RevF memory controllers (DDR vs DDR2)
 *
 * Return:
 *      number of memory channels in operation
 * Pass back:
 *      contents of the DCL0_LOW register
 */
static int k8_early_channel_count(struct amd64_pvt *pvt)
{
        int flag, err = 0;

        err = amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
        if (err)
                return err;

        if ((boot_cpu_data.x86_model >> 4) >= K8_REV_F) {
                /* RevF (NPT) and later */
                flag = pvt->dclr0 & F10_WIDTH_128;
        } else {
                /* RevE and earlier */
                flag = pvt->dclr0 & REVE_WIDTH_128;
        }

        /* not used */
        pvt->dclr1 = 0;

        return (flag) ? 2 : 1;
}

/* extract the ERROR ADDRESS for the K8 CPUs */
static u64 k8_get_error_address(struct mem_ctl_info *mci,
                                struct err_regs *info)
{
        return (((u64) (info->nbeah & 0xff)) << 32) +
                        (info->nbeal & ~0x03);
}

/*
 * Read the Base and Limit registers for K8 based Memory controllers; extract
 * fields from the 'raw' reg into separate data fields
 *
 * Isolates: BASE, LIMIT, IntlvEn, IntlvSel, RW_EN
 */
static void k8_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
{
        u32 low;
        u32 off = dram << 3;    /* 8 bytes between DRAM entries */

        amd64_read_pci_cfg(pvt->addr_f1_ctl, K8_DRAM_BASE_LOW + off, &low);

        /* Extract parts into separate data entries */
        pvt->dram_base[dram] = ((u64) low & 0xFFFF0000) << 8;
        pvt->dram_IntlvEn[dram] = (low >> 8) & 0x7;
        pvt->dram_rw_en[dram] = (low & 0x3);

        amd64_read_pci_cfg(pvt->addr_f1_ctl, K8_DRAM_LIMIT_LOW + off, &low);

        /*
         * Extract parts into separate data entries. Limit is the HIGHEST memory
         * location of the region, so lower 24 bits need to be all ones
         */
        pvt->dram_limit[dram] = (((u64) low & 0xFFFF0000) << 8) | 0x00FFFFFF;
        pvt->dram_IntlvSel[dram] = (low >> 8) & 0x7;
        pvt->dram_DstNode[dram] = (low & 0x7);
}

static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci,
                                        struct err_regs *info,
                                        u64 sys_addr)
{
        struct mem_ctl_info *src_mci;
        unsigned short syndrome;
        int channel, csrow;
        u32 page, offset;

        /* Extract the syndrome parts and form a 16-bit syndrome */
        syndrome  = HIGH_SYNDROME(info->nbsl) << 8;
        syndrome |= LOW_SYNDROME(info->nbsh);

        /* CHIPKILL enabled */
        if (info->nbcfg & K8_NBCFG_CHIPKILL) {
                channel = get_channel_from_ecc_syndrome(mci, syndrome);
                if (channel < 0) {
                        /*
                         * Syndrome didn't map, so we don't know which of the
                         * 2 DIMMs is in error. So we need to ID 'both' of them
                         * as suspect.
                         */
                        amd64_mc_printk(mci, KERN_WARNING,
                                       "unknown syndrome 0x%x - possible error "
                                       "reporting race\n", syndrome);
                        edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
                        return;
                }
        } else {
                /*
                 * non-chipkill ecc mode
                 *
                 * The k8 documentation is unclear about how to determine the
                 * channel number when using non-chipkill memory.  This method
                 * was obtained from email communication with someone at AMD.
                 * (Wish the email was placed in this comment - norsk)
                 */
                channel = ((sys_addr & BIT(3)) != 0);
        }

        /*
         * Find out which node the error address belongs to. This may be
         * different from the node that detected the error.
         */
        src_mci = find_mc_by_sys_addr(mci, sys_addr);
        if (!src_mci) {
                amd64_mc_printk(mci, KERN_ERR,
                             "failed to map error address 0x%lx to a node\n",
                             (unsigned long)sys_addr);
                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
                return;
        }

        /* Now map the sys_addr to a CSROW */
        csrow = sys_addr_to_csrow(src_mci, sys_addr);
        if (csrow < 0) {
                edac_mc_handle_ce_no_info(src_mci, EDAC_MOD_STR);
        } else {
                error_address_to_page_and_offset(sys_addr, &page, &offset);

                edac_mc_handle_ce(src_mci, page, offset, syndrome, csrow,
                                  channel, EDAC_MOD_STR);
        }
}

static int k8_dbam_to_chip_select(struct amd64_pvt *pvt, int cs_mode)
{
        int *dbam_map;

        if (pvt->ext_model >= K8_REV_F)
                dbam_map = ddr2_dbam;
        else if (pvt->ext_model >= K8_REV_D)
                dbam_map = ddr2_dbam_revD;
        else
                dbam_map = ddr2_dbam_revCG;

        return dbam_map[cs_mode];
}

/*
 * Get the number of DCT channels in use.
 *
 * Return:
 *      number of Memory Channels in operation
 * Pass back:
 *      contents of the DCL0_LOW register
 */
static int f10_early_channel_count(struct amd64_pvt *pvt)
{
        int dbams[] = { DBAM0, DBAM1 };
        int i, j, channels = 0;
        u32 dbam;

        /* If we are in 128 bit mode, then we are using 2 channels */
        if (pvt->dclr0 & F10_WIDTH_128) {
                channels = 2;
                return channels;
        }

        /*
         * Need to check if in unganged mode: In such, there are 2 channels,
         * but they are not in 128 bit mode and thus the above 'dclr0' status
         * bit will be OFF.
         *
         * Need to check DCT0[0] and DCT1[0] to see if only one of them has
         * their CSEnable bit on. If so, then SINGLE DIMM case.
         */
        debugf0("Data width is not 128 bits - need more decoding\n");

        /*
         * Check DRAM Bank Address Mapping values for each DIMM to see if there
         * is more than just one DIMM present in unganged mode. Need to check
         * both controllers since DIMMs can be placed in either one.
         */
        for (i = 0; i < ARRAY_SIZE(dbams); i++) {
                if (amd64_read_pci_cfg(pvt->dram_f2_ctl, dbams[i], &dbam))
                        goto err_reg;

                for (j = 0; j < 4; j++) {
                        if (DBAM_DIMM(j, dbam) > 0) {
                                channels++;
                                break;
                        }
                }
        }

        if (channels > 2)
                channels = 2;

        debugf0("MCT channel count: %d\n", channels);

        return channels;

err_reg:
        return -1;

}

static int f10_dbam_to_chip_select(struct amd64_pvt *pvt, int cs_mode)
{
        int *dbam_map;

        if (pvt->dchr0 & DDR3_MODE || pvt->dchr1 & DDR3_MODE)
                dbam_map = ddr3_dbam;
        else
                dbam_map = ddr2_dbam;

        return dbam_map[cs_mode];
}

/* Enable extended configuration access via 0xCF8 feature */
static void amd64_setup(struct amd64_pvt *pvt)
{
        u32 reg;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, &reg);

        pvt->flags.cf8_extcfg = !!(reg & F10_NB_CFG_LOW_ENABLE_EXT_CFG);
        reg |= F10_NB_CFG_LOW_ENABLE_EXT_CFG;
        pci_write_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, reg);
}

/* Restore the extended configuration access via 0xCF8 feature */
static void amd64_teardown(struct amd64_pvt *pvt)
{
        u32 reg;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, &reg);

        reg &= ~F10_NB_CFG_LOW_ENABLE_EXT_CFG;
        if (pvt->flags.cf8_extcfg)
                reg |= F10_NB_CFG_LOW_ENABLE_EXT_CFG;
        pci_write_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, reg);
}

static u64 f10_get_error_address(struct mem_ctl_info *mci,
                        struct err_regs *info)
{
        return (((u64) (info->nbeah & 0xffff)) << 32) +
                        (info->nbeal & ~0x01);
}

/*
 * Read the Base and Limit registers for F10 based Memory controllers. Extract
 * fields from the 'raw' reg into separate data fields.
 *
 * Isolates: BASE, LIMIT, IntlvEn, IntlvSel, RW_EN.
 */
static void f10_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
{
        u32 high_offset, low_offset, high_base, low_base, high_limit, low_limit;

        low_offset = K8_DRAM_BASE_LOW + (dram << 3);
        high_offset = F10_DRAM_BASE_HIGH + (dram << 3);

        /* read the 'raw' DRAM BASE Address register */
        amd64_read_pci_cfg(pvt->addr_f1_ctl, low_offset, &low_base);

        /* Read from the ECS data register */
        amd64_read_pci_cfg(pvt->addr_f1_ctl, high_offset, &high_base);

        /* Extract parts into separate data entries */
        pvt->dram_rw_en[dram] = (low_base & 0x3);

        if (pvt->dram_rw_en[dram] == 0)
                return;

        pvt->dram_IntlvEn[dram] = (low_base >> 8) & 0x7;

        pvt->dram_base[dram] = (((u64)high_base & 0x000000FF) << 40) |
                               (((u64)low_base  & 0xFFFF0000) << 8);

        low_offset = K8_DRAM_LIMIT_LOW + (dram << 3);
        high_offset = F10_DRAM_LIMIT_HIGH + (dram << 3);

        /* read the 'raw' LIMIT registers */
        amd64_read_pci_cfg(pvt->addr_f1_ctl, low_offset, &low_limit);

        /* Read from the ECS data register for the HIGH portion */
        amd64_read_pci_cfg(pvt->addr_f1_ctl, high_offset, &high_limit);

        pvt->dram_DstNode[dram] = (low_limit & 0x7);
        pvt->dram_IntlvSel[dram] = (low_limit >> 8) & 0x7;

        /*
         * Extract address values and form a LIMIT address. Limit is the HIGHEST
         * memory location of the region, so low 24 bits need to be all ones.
         */
        pvt->dram_limit[dram] = (((u64)high_limit & 0x000000FF) << 40) |
                                (((u64) low_limit & 0xFFFF0000) << 8) |
                                0x00FFFFFF;
}

static void f10_read_dram_ctl_register(struct amd64_pvt *pvt)
{

        if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCTL_SEL_LOW,
                                &pvt->dram_ctl_select_low)) {
                debugf0("F2x110 (DCTL Sel. Low): 0x%08x, "
                        "High range addresses at: 0x%x\n",
                        pvt->dram_ctl_select_low,
                        dct_sel_baseaddr(pvt));

                debugf0("  DCT mode: %s, All DCTs on: %s\n",
                        (dct_ganging_enabled(pvt) ? "ganged" : "unganged"),
                        (dct_dram_enabled(pvt) ? "yes"   : "no"));

                if (!dct_ganging_enabled(pvt))
                        debugf0("  Address range split per DCT: %s\n",
                                (dct_high_range_enabled(pvt) ? "yes" : "no"));

                debugf0("  DCT data interleave for ECC: %s, "
                        "DRAM cleared since last warm reset: %s\n",
                        (dct_data_intlv_enabled(pvt) ? "enabled" : "disabled"),
                        (dct_memory_cleared(pvt) ? "yes" : "no"));

                debugf0("  DCT channel interleave: %s, "
                        "DCT interleave bits selector: 0x%x\n",
                        (dct_interleave_enabled(pvt) ? "enabled" : "disabled"),
                        dct_sel_interleave_addr(pvt));
        }

        amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCTL_SEL_HIGH,
                           &pvt->dram_ctl_select_high);
}

/*
 * determine channel based on the interleaving mode: F10h BKDG, 2.8.9 Memory
 * Interleaving Modes.
 */
static u32 f10_determine_channel(struct amd64_pvt *pvt, u64 sys_addr,
                                int hi_range_sel, u32 intlv_en)
{
        u32 cs, temp, dct_sel_high = (pvt->dram_ctl_select_low >> 1) & 1;

        if (dct_ganging_enabled(pvt))
                cs = 0;
        else if (hi_range_sel)
                cs = dct_sel_high;
        else if (dct_interleave_enabled(pvt)) {
                /*
                 * see F2x110[DctSelIntLvAddr] - channel interleave mode
                 */
                if (dct_sel_interleave_addr(pvt) == 0)
                        cs = sys_addr >> 6 & 1;
                else if ((dct_sel_interleave_addr(pvt) >> 1) & 1) {
                        temp = hweight_long((u32) ((sys_addr >> 16) & 0x1F)) % 2;

                        if (dct_sel_interleave_addr(pvt) & 1)
                                cs = (sys_addr >> 9 & 1) ^ temp;
                        else
                                cs = (sys_addr >> 6 & 1) ^ temp;
                } else if (intlv_en & 4)
                        cs = sys_addr >> 15 & 1;
                else if (intlv_en & 2)
                        cs = sys_addr >> 14 & 1;
                else if (intlv_en & 1)
                        cs = sys_addr >> 13 & 1;
                else
                        cs = sys_addr >> 12 & 1;
        } else if (dct_high_range_enabled(pvt) && !dct_ganging_enabled(pvt))
                cs = ~dct_sel_high & 1;
        else
                cs = 0;

        return cs;
}

static inline u32 f10_map_intlv_en_to_shift(u32 intlv_en)
{
        if (intlv_en == 1)
                return 1;
        else if (intlv_en == 3)
                return 2;
        else if (intlv_en == 7)
                return 3;

        return 0;
}

/* See F10h BKDG, 2.8.10.2 DctSelBaseOffset Programming */
static inline u64 f10_get_base_addr_offset(u64 sys_addr, int hi_range_sel,
                                                 u32 dct_sel_base_addr,
                                                 u64 dct_sel_base_off,
                                                 u32 hole_valid, u32 hole_off,
                                                 u64 dram_base)
{
        u64 chan_off;

        if (hi_range_sel) {
                if (!(dct_sel_base_addr & 0xFFFFF800) &&
                   hole_valid && (sys_addr >= 0x100000000ULL))
                        chan_off = hole_off << 16;
                else
                        chan_off = dct_sel_base_off;
        } else {
                if (hole_valid && (sys_addr >= 0x100000000ULL))
                        chan_off = hole_off << 16;
                else
                        chan_off = dram_base & 0xFFFFF8000000ULL;
        }

        return (sys_addr & 0x0000FFFFFFFFFFC0ULL) -
                        (chan_off & 0x0000FFFFFF800000ULL);
}

/* Hack for the time being - Can we get this from BIOS?? */
#define CH0SPARE_RANK   0
#define CH1SPARE_RANK   1

/*
 * checks if the csrow passed in is marked as SPARED, if so returns the new
 * spare row
 */
static inline int f10_process_possible_spare(int csrow,
                                u32 cs, struct amd64_pvt *pvt)
{
        u32 swap_done;
        u32 bad_dram_cs;

        /* Depending on channel, isolate respective SPARING info */
        if (cs) {
                swap_done = F10_ONLINE_SPARE_SWAPDONE1(pvt->online_spare);
                bad_dram_cs = F10_ONLINE_SPARE_BADDRAM_CS1(pvt->online_spare);
                if (swap_done && (csrow == bad_dram_cs))
                        csrow = CH1SPARE_RANK;
        } else {
                swap_done = F10_ONLINE_SPARE_SWAPDONE0(pvt->online_spare);
                bad_dram_cs = F10_ONLINE_SPARE_BADDRAM_CS0(pvt->online_spare);
                if (swap_done && (csrow == bad_dram_cs))
                        csrow = CH0SPARE_RANK;
        }
        return csrow;
}

/*
 * Iterate over the DRAM DCT "base" and "mask" registers looking for a
 * SystemAddr match on the specified 'ChannelSelect' and 'NodeID'
 *
 * Return:
 *      -EINVAL:  NOT FOUND
 *      0..csrow = Chip-Select Row
 */
static int f10_lookup_addr_in_dct(u32 in_addr, u32 nid, u32 cs)
{
        struct mem_ctl_info *mci;
        struct amd64_pvt *pvt;
        u32 cs_base, cs_mask;
        int cs_found = -EINVAL;
        int csrow;

        mci = mci_lookup[nid];
        if (!mci)
                return cs_found;

        pvt = mci->pvt_info;

        debugf1("InputAddr=0x%x  channelselect=%d\n", in_addr, cs);

        for (csrow = 0; csrow < pvt->cs_count; csrow++) {

                cs_base = amd64_get_dct_base(pvt, cs, csrow);
                if (!(cs_base & K8_DCSB_CS_ENABLE))
                        continue;

                /*
                 * We have an ENABLED CSROW, Isolate just the MASK bits of the
                 * target: [28:19] and [13:5], which map to [36:27] and [21:13]
                 * of the actual address.
                 */
                cs_base &= REV_F_F1Xh_DCSB_BASE_BITS;

                /*
                 * Get the DCT Mask, and ENABLE the reserved bits: [18:16] and
                 * [4:0] to become ON. Then mask off bits [28:0] ([36:8])
                 */
                cs_mask = amd64_get_dct_mask(pvt, cs, csrow);

                debugf1("    CSROW=%d CSBase=0x%x RAW CSMask=0x%x\n",
                                csrow, cs_base, cs_mask);

                cs_mask = (cs_mask | 0x0007C01F) & 0x1FFFFFFF;

                debugf1("              Final CSMask=0x%x\n", cs_mask);
                debugf1("    (InputAddr & ~CSMask)=0x%x "
                                "(CSBase & ~CSMask)=0x%x\n",
                                (in_addr & ~cs_mask), (cs_base & ~cs_mask));

                if ((in_addr & ~cs_mask) == (cs_base & ~cs_mask)) {
                        cs_found = f10_process_possible_spare(csrow, cs, pvt);

                        debugf1(" MATCH csrow=%d\n", cs_found);
                        break;
                }
        }
        return cs_found;
}

/* For a given @dram_range, check if @sys_addr falls within it. */
static int f10_match_to_this_node(struct amd64_pvt *pvt, int dram_range,
                                  u64 sys_addr, int *nid, int *chan_sel)
{
        int node_id, cs_found = -EINVAL, high_range = 0;
        u32 intlv_en, intlv_sel, intlv_shift, hole_off;
        u32 hole_valid, tmp, dct_sel_base, channel;
        u64 dram_base, chan_addr, dct_sel_base_off;

        dram_base = pvt->dram_base[dram_range];
        intlv_en = pvt->dram_IntlvEn[dram_range];

        node_id = pvt->dram_DstNode[dram_range];
        intlv_sel = pvt->dram_IntlvSel[dram_range];

        debugf1("(dram=%d) Base=0x%llx SystemAddr= 0x%llx Limit=0x%llx\n",
                dram_range, dram_base, sys_addr, pvt->dram_limit[dram_range]);

        /*
         * This assumes that one node's DHAR is the same as all the other
         * nodes' DHAR.
         */
        hole_off = (pvt->dhar & 0x0000FF80);
        hole_valid = (pvt->dhar & 0x1);
        dct_sel_base_off = (pvt->dram_ctl_select_high & 0xFFFFFC00) << 16;

        debugf1("   HoleOffset=0x%x  HoleValid=0x%x IntlvSel=0x%x\n",
                        hole_off, hole_valid, intlv_sel);

        if (intlv_en ||
            (intlv_sel != ((sys_addr >> 12) & intlv_en)))
                return -EINVAL;

        dct_sel_base = dct_sel_baseaddr(pvt);

        /*
         * check whether addresses >= DctSelBaseAddr[47:27] are to be used to
         * select between DCT0 and DCT1.
         */
        if (dct_high_range_enabled(pvt) &&
           !dct_ganging_enabled(pvt) &&
           ((sys_addr >> 27) >= (dct_sel_base >> 11)))
                high_range = 1;

        channel = f10_determine_channel(pvt, sys_addr, high_range, intlv_en);

        chan_addr = f10_get_base_addr_offset(sys_addr, high_range, dct_sel_base,
                                             dct_sel_base_off, hole_valid,
                                             hole_off, dram_base);

        intlv_shift = f10_map_intlv_en_to_shift(intlv_en);

        /* remove Node ID (in case of memory interleaving) */
        tmp = chan_addr & 0xFC0;

        chan_addr = ((chan_addr >> intlv_shift) & 0xFFFFFFFFF000ULL) | tmp;

        /* remove channel interleave and hash */
        if (dct_interleave_enabled(pvt) &&
           !dct_high_range_enabled(pvt) &&
           !dct_ganging_enabled(pvt)) {
                if (dct_sel_interleave_addr(pvt) != 1)
                        chan_addr = (chan_addr >> 1) & 0xFFFFFFFFFFFFFFC0ULL;
                else {
                        tmp = chan_addr & 0xFC0;
                        chan_addr = ((chan_addr & 0xFFFFFFFFFFFFC000ULL) >> 1)
                                        | tmp;
                }
        }

        debugf1("   (ChannelAddrLong=0x%llx) >> 8 becomes InputAddr=0x%x\n",
                chan_addr, (u32)(chan_addr >> 8));

        cs_found = f10_lookup_addr_in_dct(chan_addr >> 8, node_id, channel);

        if (cs_found >= 0) {
                *nid = node_id;
                *chan_sel = channel;
        }
        return cs_found;
}

static int f10_translate_sysaddr_to_cs(struct amd64_pvt *pvt, u64 sys_addr,
                                       int *node, int *chan_sel)
{
        int dram_range, cs_found = -EINVAL;
        u64 dram_base, dram_limit;

        for (dram_range = 0; dram_range < DRAM_REG_COUNT; dram_range++) {

                if (!pvt->dram_rw_en[dram_range])
                        continue;

                dram_base = pvt->dram_base[dram_range];
                dram_limit = pvt->dram_limit[dram_range];

                if ((dram_base <= sys_addr) && (sys_addr <= dram_limit)) {

                        cs_found = f10_match_to_this_node(pvt, dram_range,
                                                          sys_addr, node,
                                                          chan_sel);
                        if (cs_found >= 0)
                                break;
                }
        }
        return cs_found;
}

/*
 * For reference see "2.8.5 Routing DRAM Requests" in F10 BKDG. This code maps
 * a @sys_addr to NodeID, DCT (channel) and chip select (CSROW).
 *
 * The @sys_addr is usually an error address received from the hardware
 * (MCX_ADDR).
 */
static void f10_map_sysaddr_to_csrow(struct mem_ctl_info *mci,
                                     struct err_regs *info,
                                     u64 sys_addr)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 page, offset;
        unsigned short syndrome;
        int nid, csrow, chan = 0;

        csrow = f10_translate_sysaddr_to_cs(pvt, sys_addr, &nid, &chan);

        if (csrow < 0) {
                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
                return;
        }

        error_address_to_page_and_offset(sys_addr, &page, &offset);

        syndrome  = HIGH_SYNDROME(info->nbsl) << 8;
        syndrome |= LOW_SYNDROME(info->nbsh);

        /*
         * We need the syndromes for channel detection only when we're
         * ganged. Otherwise @chan should already contain the channel at
         * this point.
         */
        if (dct_ganging_enabled(pvt) && pvt->nbcfg & K8_NBCFG_CHIPKILL)
                chan = get_channel_from_ecc_syndrome(mci, syndrome);

        if (chan >= 0)
                edac_mc_handle_ce(mci, page, offset, syndrome, csrow, chan,
                                  EDAC_MOD_STR);
        else
                /*
                 * Channel unknown, report all channels on this CSROW as failed.
                 */
                for (chan = 0; chan < mci->csrows[csrow].nr_channels; chan++)
                        edac_mc_handle_ce(mci, page, offset, syndrome,
                                          csrow, chan, EDAC_MOD_STR);
}

/*
 * debug routine to display the memory sizes of all logical DIMMs and its
 * CSROWs as well
 */
static void amd64_debug_display_dimm_sizes(int ctrl, struct amd64_pvt *pvt)
{
        int dimm, size0, size1, factor = 0;
        u32 dbam;
        u32 *dcsb;

        if (boot_cpu_data.x86 == 0xf) {
                if (pvt->dclr0 & F10_WIDTH_128)
                        factor = 1;

                /* K8 families < revF not supported yet */
               if (pvt->ext_model < K8_REV_F)
                        return;
               else
                       WARN_ON(ctrl != 0);
        }

        debugf1("F2x%d80 (DRAM Bank Address Mapping): 0x%08x\n",
                ctrl, ctrl ? pvt->dbam1 : pvt->dbam0);

        dbam = ctrl ? pvt->dbam1 : pvt->dbam0;
        dcsb = ctrl ? pvt->dcsb1 : pvt->dcsb0;

        edac_printk(KERN_DEBUG, EDAC_MC, "DCT%d chip selects:\n", ctrl);

        /* Dump memory sizes for DIMM and its CSROWs */
        for (dimm = 0; dimm < 4; dimm++) {

                size0 = 0;
                if (dcsb[dimm*2] & K8_DCSB_CS_ENABLE)
                        size0 = pvt->ops->dbam_to_cs(pvt, DBAM_DIMM(dimm, dbam));

                size1 = 0;
                if (dcsb[dimm*2 + 1] & K8_DCSB_CS_ENABLE)
                        size1 = pvt->ops->dbam_to_cs(pvt, DBAM_DIMM(dimm, dbam));

                edac_printk(KERN_DEBUG, EDAC_MC, " %d: %5dMB %d: %5dMB\n",
                            dimm * 2,     size0 << factor,
                            dimm * 2 + 1, size1 << factor);
        }
}

/*
 * There currently are 3 types type of MC devices for AMD Athlon/Opterons
 * (as per PCI DEVICE_IDs):
 *
 * Family K8: That is the Athlon64 and Opteron CPUs. They all have the same PCI
 * DEVICE ID, even though there is differences between the different Revisions
 * (CG,D,E,F).
 *
 * Family F10h and F11h.
 *
 */
static struct amd64_family_type amd64_family_types[] = {
        [K8_CPUS] = {
                .ctl_name = "RevF",
                .addr_f1_ctl = PCI_DEVICE_ID_AMD_K8_NB_ADDRMAP,
                .misc_f3_ctl = PCI_DEVICE_ID_AMD_K8_NB_MISC,
                .ops = {
                        .early_channel_count    = k8_early_channel_count,
                        .get_error_address      = k8_get_error_address,
                        .read_dram_base_limit   = k8_read_dram_base_limit,
                        .map_sysaddr_to_csrow   = k8_map_sysaddr_to_csrow,
                        .dbam_to_cs             = k8_dbam_to_chip_select,
                }
        },
        [F10_CPUS] = {
                .ctl_name = "Family 10h",
                .addr_f1_ctl = PCI_DEVICE_ID_AMD_10H_NB_MAP,
                .misc_f3_ctl = PCI_DEVICE_ID_AMD_10H_NB_MISC,
                .ops = {
                        .early_channel_count    = f10_early_channel_count,
                        .get_error_address      = f10_get_error_address,
                        .read_dram_base_limit   = f10_read_dram_base_limit,
                        .read_dram_ctl_register = f10_read_dram_ctl_register,
                        .map_sysaddr_to_csrow   = f10_map_sysaddr_to_csrow,
                        .dbam_to_cs             = f10_dbam_to_chip_select,
                }
        },
        [F11_CPUS] = {
                .ctl_name = "Family 11h",
                .addr_f1_ctl = PCI_DEVICE_ID_AMD_11H_NB_MAP,
                .misc_f3_ctl = PCI_DEVICE_ID_AMD_11H_NB_MISC,
                .ops = {
                        .early_channel_count    = f10_early_channel_count,
                        .get_error_address      = f10_get_error_address,
                        .read_dram_base_limit   = f10_read_dram_base_limit,
                        .read_dram_ctl_register = f10_read_dram_ctl_register,
                        .map_sysaddr_to_csrow   = f10_map_sysaddr_to_csrow,
                        .dbam_to_cs             = f10_dbam_to_chip_select,
                }
        },
};

static struct pci_dev *pci_get_related_function(unsigned int vendor,
                                                unsigned int device,
                                                struct pci_dev *related)
{
        struct pci_dev *dev = NULL;

        dev = pci_get_device(vendor, device, dev);
        while (dev) {
                if ((dev->bus->number == related->bus->number) &&
                    (PCI_SLOT(dev->devfn) == PCI_SLOT(related->devfn)))
                        break;
                dev = pci_get_device(vendor, device, dev);
        }

        return dev;
}

/*
 * These are tables of eigenvectors (one per line) which can be used for the
 * construction of the syndrome tables. The modified syndrome search algorithm
 * uses those to find the symbol in error and thus the DIMM.
 *
 * Algorithm courtesy of Ross LaFetra from AMD.
 */
static u16 x4_vectors[] = {
        0x2f57, 0x1afe, 0x66cc, 0xdd88,
        0x11eb, 0x3396, 0x7f4c, 0xeac8,
        0x0001, 0x0002, 0x0004, 0x0008,
        0x1013, 0x3032, 0x4044, 0x8088,
        0x106b, 0x30d6, 0x70fc, 0xe0a8,
        0x4857, 0xc4fe, 0x13cc, 0x3288,
        0x1ac5, 0x2f4a, 0x5394, 0xa1e8,
        0x1f39, 0x251e, 0xbd6c, 0x6bd8,
        0x15c1, 0x2a42, 0x89ac, 0x4758,
        0x2b03, 0x1602, 0x4f0c, 0xca08,
        0x1f07, 0x3a0e, 0x6b04, 0xbd08,
        0x8ba7, 0x465e, 0x244c, 0x1cc8,
        0x2b87, 0x164e, 0x642c, 0xdc18,
        0x40b9, 0x80de, 0x1094, 0x20e8,
        0x27db, 0x1eb6, 0x9dac, 0x7b58,
        0x11c1, 0x2242, 0x84ac, 0x4c58,
        0x1be5, 0x2d7a, 0x5e34, 0xa718,
        0x4b39, 0x8d1e, 0x14b4, 0x28d8,
        0x4c97, 0xc87e, 0x11fc, 0x33a8,
        0x8e97, 0x497e, 0x2ffc, 0x1aa8,
        0x16b3, 0x3d62, 0x4f34, 0x8518,
        0x1e2f, 0x391a, 0x5cac, 0xf858,
        0x1d9f, 0x3b7a, 0x572c, 0xfe18,
        0x15f5, 0x2a5a, 0x5264, 0xa3b8,
        0x1dbb, 0x3b66, 0x715c, 0xe3f8,
        0x4397, 0xc27e, 0x17fc, 0x3ea8,
        0x1617, 0x3d3e, 0x6464, 0xb8b8,
        0x23ff, 0x12aa, 0xab6c, 0x56d8,
        0x2dfb, 0x1ba6, 0x913c, 0x7328,
        0x185d, 0x2ca6, 0x7914, 0x9e28,
        0x171b, 0x3e36, 0x7d7c, 0xebe8,
        0x4199, 0x82ee, 0x19f4, 0x2e58,
        0x4807, 0xc40e, 0x130c, 0x3208,
        0x1905, 0x2e0a, 0x5804, 0xac08,
        0x213f, 0x132a, 0xadfc, 0x5ba8,
        0x19a9, 0x2efe, 0xb5cc, 0x6f88,
};

static u16 x8_vectors[] = {
        0x0145, 0x028a, 0x2374, 0x43c8, 0xa1f0, 0x0520, 0x0a40, 0x1480,
        0x0211, 0x0422, 0x0844, 0x1088, 0x01b0, 0x44e0, 0x23c0, 0xed80,
        0x1011, 0x0116, 0x022c, 0x0458, 0x08b0, 0x8c60, 0x2740, 0x4e80,
        0x0411, 0x0822, 0x1044, 0x0158, 0x02b0, 0x2360, 0x46c0, 0xab80,
        0x0811, 0x1022, 0x012c, 0x0258, 0x04b0, 0x4660, 0x8cc0, 0x2780,
        0x2071, 0x40e2, 0xa0c4, 0x0108, 0x0210, 0x0420, 0x0840, 0x1080,
        0x4071, 0x80e2, 0x0104, 0x0208, 0x0410, 0x0820, 0x1040, 0x2080,
        0x8071, 0x0102, 0x0204, 0x0408, 0x0810, 0x1020, 0x2040, 0x4080,
        0x019d, 0x03d6, 0x136c, 0x2198, 0x50b0, 0xb2e0, 0x0740, 0x0e80,
        0x0189, 0x03ea, 0x072c, 0x0e58, 0x1cb0, 0x56e0, 0x37c0, 0xf580,
        0x01fd, 0x0376, 0x06ec, 0x0bb8, 0x1110, 0x2220, 0x4440, 0x8880,
        0x0163, 0x02c6, 0x1104, 0x0758, 0x0eb0, 0x2be0, 0x6140, 0xc280,
        0x02fd, 0x01c6, 0x0b5c, 0x1108, 0x07b0, 0x25a0, 0x8840, 0x6180,
        0x0801, 0x012e, 0x025c, 0x04b8, 0x1370, 0x26e0, 0x57c0, 0xb580,
        0x0401, 0x0802, 0x015c, 0x02b8, 0x22b0, 0x13e0, 0x7140, 0xe280,
        0x0201, 0x0402, 0x0804, 0x01b8, 0x11b0, 0x31a0, 0x8040, 0x7180,
        0x0101, 0x0202, 0x0404, 0x0808, 0x1010, 0x2020, 0x4040, 0x8080,
        0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
        0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000, 0x8000,
};

static int decode_syndrome(u16 syndrome, u16 *vectors, int num_vecs,
                                 int v_dim)
{
        unsigned int i, err_sym;

        for (err_sym = 0; err_sym < num_vecs / v_dim; err_sym++) {
                u16 s = syndrome;
                int v_idx =  err_sym * v_dim;
                int v_end = (err_sym + 1) * v_dim;

                /* walk over all 16 bits of the syndrome */
                for (i = 1; i < (1U << 16); i <<= 1) {

                        /* if bit is set in that eigenvector... */
                        if (v_idx < v_end && vectors[v_idx] & i) {
                                u16 ev_comp = vectors[v_idx++];

                                /* ... and bit set in the modified syndrome, */
                                if (s & i) {
                                        /* remove it. */
                                        s ^= ev_comp;

                                        if (!s)
                                                return err_sym;
                                }

                        } else if (s & i)
                                /* can't get to zero, move to next symbol */
                                break;
                }
        }

        debugf0("syndrome(%x) not found\n", syndrome);
        return -1;
}

static int map_err_sym_to_channel(int err_sym, int sym_size)
{
        if (sym_size == 4)
                switch (err_sym) {
                case 0x20:
                case 0x21:
                        return 0;
                        break;
                case 0x22:
                case 0x23:
                        return 1;
                        break;
                default:
                        return err_sym >> 4;
                        break;
                }
        /* x8 symbols */
        else
                switch (err_sym) {
                /* imaginary bits not in a DIMM */
                case 0x10:
                        WARN(1, KERN_ERR "Invalid error symbol: 0x%x\n",
                                          err_sym);
                        return -1;
                        break;

                case 0x11:
                        return 0;
                        break;
                case 0x12:
                        return 1;
                        break;
                default:
                        return err_sym >> 3;
                        break;
                }
        return -1;
}

static int get_channel_from_ecc_syndrome(struct mem_ctl_info *mci, u16 syndrome)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 value = 0;
        int err_sym = 0;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, 0x180, &value);

        /* F3x180[EccSymbolSize]=1, x8 symbols */
        if (boot_cpu_data.x86 == 0x10 &&
            boot_cpu_data.x86_model > 7 &&
            value & BIT(25)) {
                err_sym = decode_syndrome(syndrome, x8_vectors,
                                          ARRAY_SIZE(x8_vectors), 8);
                return map_err_sym_to_channel(err_sym, 8);
        } else {
                err_sym = decode_syndrome(syndrome, x4_vectors,
                                          ARRAY_SIZE(x4_vectors), 4);
                return map_err_sym_to_channel(err_sym, 4);
        }
}

/*
 * Check for valid error in the NB Status High register. If so, proceed to read
 * NB Status Low, NB Address Low and NB Address High registers and store data
 * into error structure.
 *
 * Returns:
 *      - 1: if hardware regs contains valid error info
 *      - 0: if no valid error is indicated
 */
static int amd64_get_error_info_regs(struct mem_ctl_info *mci,
                                     struct err_regs *regs)
{
        struct amd64_pvt *pvt;
        struct pci_dev *misc_f3_ctl;

        pvt = mci->pvt_info;
        misc_f3_ctl = pvt->misc_f3_ctl;

        if (amd64_read_pci_cfg(misc_f3_ctl, K8_NBSH, &regs->nbsh))
                return 0;

        if (!(regs->nbsh & K8_NBSH_VALID_BIT))
                return 0;

        /* valid error, read remaining error information registers */
        if (amd64_read_pci_cfg(misc_f3_ctl, K8_NBSL, &regs->nbsl) ||
            amd64_read_pci_cfg(misc_f3_ctl, K8_NBEAL, &regs->nbeal) ||
            amd64_read_pci_cfg(misc_f3_ctl, K8_NBEAH, &regs->nbeah) ||
            amd64_read_pci_cfg(misc_f3_ctl, K8_NBCFG, &regs->nbcfg))
                return 0;

        return 1;
}

/*
 * This function is called to retrieve the error data from hardware and store it
 * in the info structure.
 *
 * Returns:
 *      - 1: if a valid error is found
 *      - 0: if no error is found
 */
static int amd64_get_error_info(struct mem_ctl_info *mci,
                                struct err_regs *info)
{
        struct amd64_pvt *pvt;
        struct err_regs regs;

        pvt = mci->pvt_info;

        if (!amd64_get_error_info_regs(mci, info))
                return 0;

        /*
         * Here's the problem with the K8's EDAC reporting: There are four
         * registers which report pieces of error information. They are shared
         * between CEs and UEs. Furthermore, contrary to what is stated in the
         * BKDG, the overflow bit is never used! Every error always updates the
         * reporting registers.
         *
         * Can you see the race condition? All four error reporting registers
         * must be read before a new error updates them! There is no way to read
         * all four registers atomically. The best than can be done is to detect
         * that a race has occured and then report the error without any kind of
         * precision.
         *
         * What is still positive is that errors are still reported and thus
         * problems can still be detected - just not localized because the
         * syndrome and address are spread out across registers.
         *
         * Grrrrr!!!!!  Here's hoping that AMD fixes this in some future K8 rev.
         * UEs and CEs should have separate register sets with proper overflow
         * bits that are used! At very least the problem can be fixed by
         * honoring the ErrValid bit in 'nbsh' and not updating registers - just
         * set the overflow bit - unless the current error is CE and the new
         * error is UE which would be the only situation for overwriting the
         * current values.
         */

        regs = *info;

        /* Use info from the second read - most current */
        if (unlikely(!amd64_get_error_info_regs(mci, info)))
                return 0;

        /* clear the error bits in hardware */
        pci_write_bits32(pvt->misc_f3_ctl, K8_NBSH, 0, K8_NBSH_VALID_BIT);

        /* Check for the possible race condition */
        if ((regs.nbsh != info->nbsh) ||
             (regs.nbsl != info->nbsl) ||
             (regs.nbeah != info->nbeah) ||
             (regs.nbeal != info->nbeal)) {
                amd64_mc_printk(mci, KERN_WARNING,
                                "hardware STATUS read access race condition "
                                "detected!\n");
                return 0;
        }
        return 1;
}

/*
 * Handle any Correctable Errors (CEs) that have occurred. Check for valid ERROR
 * ADDRESS and process.
 */
static void amd64_handle_ce(struct mem_ctl_info *mci,
                            struct err_regs *info)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u64 sys_addr;

        /* Ensure that the Error Address is VALID */
        if ((info->nbsh & K8_NBSH_VALID_ERROR_ADDR) == 0) {
                amd64_mc_printk(mci, KERN_ERR,
                        "HW has no ERROR_ADDRESS available\n");
                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
                return;
        }

        sys_addr = pvt->ops->get_error_address(mci, info);

        amd64_mc_printk(mci, KERN_ERR,
                "CE ERROR_ADDRESS= 0x%llx\n", sys_addr);

        pvt->ops->map_sysaddr_to_csrow(mci, info, sys_addr);
}

/* Handle any Un-correctable Errors (UEs) */
static void amd64_handle_ue(struct mem_ctl_info *mci,
                            struct err_regs *info)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        struct mem_ctl_info *log_mci, *src_mci = NULL;
        int csrow;
        u64 sys_addr;
        u32 page, offset;

        log_mci = mci;

        if ((info->nbsh & K8_NBSH_VALID_ERROR_ADDR) == 0) {
                amd64_mc_printk(mci, KERN_CRIT,
                        "HW has no ERROR_ADDRESS available\n");
                edac_mc_handle_ue_no_info(log_mci, EDAC_MOD_STR);
                return;
        }

        sys_addr = pvt->ops->get_error_address(mci, info);

        /*
         * Find out which node the error address belongs to. This may be
         * different from the node that detected the error.
         */
        src_mci = find_mc_by_sys_addr(mci, sys_addr);
        if (!src_mci) {
                amd64_mc_printk(mci, KERN_CRIT,
                        "ERROR ADDRESS (0x%lx) value NOT mapped to a MC\n",
                        (unsigned long)sys_addr);
                edac_mc_handle_ue_no_info(log_mci, EDAC_MOD_STR);
                return;
        }

        log_mci = src_mci;

        csrow = sys_addr_to_csrow(log_mci, sys_addr);
        if (csrow < 0) {
                amd64_mc_printk(mci, KERN_CRIT,
                        "ERROR_ADDRESS (0x%lx) value NOT mapped to 'csrow'\n",
                        (unsigned long)sys_addr);
                edac_mc_handle_ue_no_info(log_mci, EDAC_MOD_STR);
        } else {
                error_address_to_page_and_offset(sys_addr, &page, &offset);
                edac_mc_handle_ue(log_mci, page, offset, csrow, EDAC_MOD_STR);
        }
}

static inline void __amd64_decode_bus_error(struct mem_ctl_info *mci,
                                            struct err_regs *info)
{
        u32 ec  = ERROR_CODE(info->nbsl);
        u32 xec = EXT_ERROR_CODE(info->nbsl);
        int ecc_type = (info->nbsh >> 13) & 0x3;

        /* Bail early out if this was an 'observed' error */
        if (PP(ec) == K8_NBSL_PP_OBS)
                return;

        /* Do only ECC errors */
        if (xec && xec != F10_NBSL_EXT_ERR_ECC)
                return;

        if (ecc_type == 2)
                amd64_handle_ce(mci, info);
        else if (ecc_type == 1)
                amd64_handle_ue(mci, info);

        /*
         * If main error is CE then overflow must be CE.  If main error is UE
         * then overflow is unknown.  We'll call the overflow a CE - if
         * panic_on_ue is set then we're already panic'ed and won't arrive
         * here. Else, then apparently someone doesn't think that UE's are
         * catastrophic.
         */
        if (info->nbsh & K8_NBSH_OVERFLOW)
                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR "Error Overflow");
}

void amd64_decode_bus_error(int node_id, struct err_regs *regs)
{
        struct mem_ctl_info *mci = mci_lookup[node_id];

        __amd64_decode_bus_error(mci, regs);

        /*
         * Check the UE bit of the NB status high register, if set generate some
         * logs. If NOT a GART error, then process the event as a NO-INFO event.
         * If it was a GART error, skip that process.
         *
         * FIXME: this should go somewhere else, if at all.
         */
        if (regs->nbsh & K8_NBSH_UC_ERR && !report_gart_errors)
                edac_mc_handle_ue_no_info(mci, "UE bit is set");

}

/*
 * The main polling 'check' function, called FROM the edac core to perform the
 * error checking and if an error is encountered, error processing.
 */
static void amd64_check(struct mem_ctl_info *mci)
{
        struct err_regs regs;

        if (amd64_get_error_info(mci, &regs)) {
                struct amd64_pvt *pvt = mci->pvt_info;
                amd_decode_nb_mce(pvt->mc_node_id, &regs, 1);
        }
}

/*
 * Input:
 *      1) struct amd64_pvt which contains pvt->dram_f2_ctl pointer
 *      2) AMD Family index value
 *
 * Ouput:
 *      Upon return of 0, the following filled in:
 *
 *              struct pvt->addr_f1_ctl
 *              struct pvt->misc_f3_ctl
 *
 *      Filled in with related device funcitions of 'dram_f2_ctl'
 *      These devices are "reserved" via the pci_get_device()
 *
 *      Upon return of 1 (error status):
 *
 *              Nothing reserved
 */
static int amd64_reserve_mc_sibling_devices(struct amd64_pvt *pvt, int mc_idx)
{
        const struct amd64_family_type *amd64_dev = &amd64_family_types[mc_idx];

        /* Reserve the ADDRESS MAP Device */
        pvt->addr_f1_ctl = pci_get_related_function(pvt->dram_f2_ctl->vendor,
                                                    amd64_dev->addr_f1_ctl,
                                                    pvt->dram_f2_ctl);

        if (!pvt->addr_f1_ctl) {
                amd64_printk(KERN_ERR, "error address map device not found: "
                             "vendor %x device 0x%x (broken BIOS?)\n",
                             PCI_VENDOR_ID_AMD, amd64_dev->addr_f1_ctl);
                return 1;
        }

        /* Reserve the MISC Device */
        pvt->misc_f3_ctl = pci_get_related_function(pvt->dram_f2_ctl->vendor,
                                                    amd64_dev->misc_f3_ctl,
                                                    pvt->dram_f2_ctl);

        if (!pvt->misc_f3_ctl) {
                pci_dev_put(pvt->addr_f1_ctl);
                pvt->addr_f1_ctl = NULL;

                amd64_printk(KERN_ERR, "error miscellaneous device not found: "
                             "vendor %x device 0x%x (broken BIOS?)\n",
                             PCI_VENDOR_ID_AMD, amd64_dev->misc_f3_ctl);
                return 1;
        }

        debugf1("    Addr Map device PCI Bus ID:\t%s\n",
                pci_name(pvt->addr_f1_ctl));
        debugf1("    DRAM MEM-CTL PCI Bus ID:\t%s\n",
                pci_name(pvt->dram_f2_ctl));
        debugf1("    Misc device PCI Bus ID:\t%s\n",
                pci_name(pvt->misc_f3_ctl));

        return 0;
}

static void amd64_free_mc_sibling_devices(struct amd64_pvt *pvt)
{
        pci_dev_put(pvt->addr_f1_ctl);
        pci_dev_put(pvt->misc_f3_ctl);
}

/*
 * Retrieve the hardware registers of the memory controller (this includes the
 * 'Address Map' and 'Misc' device regs)
 */
static void amd64_read_mc_registers(struct amd64_pvt *pvt)
{
        u64 msr_val;
        int dram;

        /*
         * Retrieve TOP_MEM and TOP_MEM2; no masking off of reserved bits since
         * those are Read-As-Zero
         */
        rdmsrl(MSR_K8_TOP_MEM1, pvt->top_mem);
        debugf0("  TOP_MEM:  0x%016llx\n", pvt->top_mem);

        /* check first whether TOP_MEM2 is enabled */
        rdmsrl(MSR_K8_SYSCFG, msr_val);
        if (msr_val & (1U << 21)) {
                rdmsrl(MSR_K8_TOP_MEM2, pvt->top_mem2);
                debugf0("  TOP_MEM2: 0x%016llx\n", pvt->top_mem2);
        } else
                debugf0("  TOP_MEM2 disabled.\n");

        amd64_cpu_display_info(pvt);

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCAP, &pvt->nbcap);

        if (pvt->ops->read_dram_ctl_register)
                pvt->ops->read_dram_ctl_register(pvt);

        for (dram = 0; dram < DRAM_REG_COUNT; dram++) {
                /*
                 * Call CPU specific READ function to get the DRAM Base and
                 * Limit values from the DCT.
                 */
                pvt->ops->read_dram_base_limit(pvt, dram);

                /*
                 * Only print out debug info on rows with both R and W Enabled.
                 * Normal processing, compiler should optimize this whole 'if'
                 * debug output block away.
                 */
                if (pvt->dram_rw_en[dram] != 0) {
                        debugf1("  DRAM-BASE[%d]: 0x%016llx "
                                "DRAM-LIMIT:  0x%016llx\n",
                                dram,
                                pvt->dram_base[dram],
                                pvt->dram_limit[dram]);

                        debugf1("        IntlvEn=%s %s %s "
                                "IntlvSel=%d DstNode=%d\n",
                                pvt->dram_IntlvEn[dram] ?
                                        "Enabled" : "Disabled",
                                (pvt->dram_rw_en[dram] & 0x2) ? "W" : "!W",
                                (pvt->dram_rw_en[dram] & 0x1) ? "R" : "!R",
                                pvt->dram_IntlvSel[dram],
                                pvt->dram_DstNode[dram]);
                }
        }

        amd64_read_dct_base_mask(pvt);

        amd64_read_pci_cfg(pvt->addr_f1_ctl, K8_DHAR, &pvt->dhar);
        amd64_read_dbam_reg(pvt);

        amd64_read_pci_cfg(pvt->misc_f3_ctl,
                           F10_ONLINE_SPARE, &pvt->online_spare);

        amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
        amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCHR_0, &pvt->dchr0);

        if (!dct_ganging_enabled(pvt) && boot_cpu_data.x86 >= 0x10) {
                amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_1, &pvt->dclr1);
                amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCHR_1, &pvt->dchr1);
        }
        amd64_dump_misc_regs(pvt);
}

/*
 * NOTE: CPU Revision Dependent code
 *
 * Input:
 *      @csrow_nr ChipSelect Row Number (0..pvt->cs_count-1)
 *      k8 private pointer to -->
 *                      DRAM Bank Address mapping register
 *                      node_id
 *                      DCL register where dual_channel_active is
 *
 * The DBAM register consists of 4 sets of 4 bits each definitions:
 *
 * Bits:        CSROWs
 * 0-3          CSROWs 0 and 1
 * 4-7          CSROWs 2 and 3
 * 8-11         CSROWs 4 and 5
 * 12-15        CSROWs 6 and 7
 *
 * Values range from: 0 to 15
 * The meaning of the values depends on CPU revision and dual-channel state,
 * see relevant BKDG more info.
 *
 * The memory controller provides for total of only 8 CSROWs in its current
 * architecture. Each "pair" of CSROWs normally represents just one DIMM in
 * single channel or two (2) DIMMs in dual channel mode.
 *
 * The following code logic collapses the various tables for CSROW based on CPU
 * revision.
 *
 * Returns:
 *      The number of PAGE_SIZE pages on the specified CSROW number it
 *      encompasses
 *
 */
static u32 amd64_csrow_nr_pages(int csrow_nr, struct amd64_pvt *pvt)
{
        u32 cs_mode, nr_pages;

        /*
         * The math on this doesn't look right on the surface because x/2*4 can
         * be simplified to x*2 but this expression makes use of the fact that
         * it is integral math where 1/2=0. This intermediate value becomes the
         * number of bits to shift the DBAM register to extract the proper CSROW
         * field.
         */
        cs_mode = (pvt->dbam0 >> ((csrow_nr / 2) * 4)) & 0xF;

        nr_pages = pvt->ops->dbam_to_cs(pvt, cs_mode) << (20 - PAGE_SHIFT);

        /*
         * If dual channel then double the memory size of single channel.
         * Channel count is 1 or 2
         */
        nr_pages <<= (pvt->channel_count - 1);

        debugf0("  (csrow=%d) DBAM map index= %d\n", csrow_nr, cs_mode);
        debugf0("    nr_pages= %u  channel-count = %d\n",
                nr_pages, pvt->channel_count);

        return nr_pages;
}

/*
 * Initialize the array of csrow attribute instances, based on the values
 * from pci config hardware registers.
 */
static int amd64_init_csrows(struct mem_ctl_info *mci)
{
        struct csrow_info *csrow;
        struct amd64_pvt *pvt;
        u64 input_addr_min, input_addr_max, sys_addr;
        int i, empty = 1;

        pvt = mci->pvt_info;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &pvt->nbcfg);

        debugf0("NBCFG= 0x%x  CHIPKILL= %s DRAM ECC= %s\n", pvt->nbcfg,
                (pvt->nbcfg & K8_NBCFG_CHIPKILL) ? "Enabled" : "Disabled",
                (pvt->nbcfg & K8_NBCFG_ECC_ENABLE) ? "Enabled" : "Disabled"
                );

        for (i = 0; i < pvt->cs_count; i++) {
                csrow = &mci->csrows[i];

                if ((pvt->dcsb0[i] & K8_DCSB_CS_ENABLE) == 0) {
                        debugf1("----CSROW %d EMPTY for node %d\n", i,
                                pvt->mc_node_id);
                        continue;
                }

                debugf1("----CSROW %d VALID for MC node %d\n",
                        i, pvt->mc_node_id);

                empty = 0;
                csrow->nr_pages = amd64_csrow_nr_pages(i, pvt);
                find_csrow_limits(mci, i, &input_addr_min, &input_addr_max);
                sys_addr = input_addr_to_sys_addr(mci, input_addr_min);
                csrow->first_page = (u32) (sys_addr >> PAGE_SHIFT);
                sys_addr = input_addr_to_sys_addr(mci, input_addr_max);
                csrow->last_page = (u32) (sys_addr >> PAGE_SHIFT);
                csrow->page_mask = ~mask_from_dct_mask(pvt, i);
                /* 8 bytes of resolution */

                csrow->mtype = amd64_determine_memory_type(pvt);

                debugf1("  for MC node %d csrow %d:\n", pvt->mc_node_id, i);
                debugf1("    input_addr_min: 0x%lx input_addr_max: 0x%lx\n",
                        (unsigned long)input_addr_min,
                        (unsigned long)input_addr_max);
                debugf1("    sys_addr: 0x%lx  page_mask: 0x%lx\n",
                        (unsigned long)sys_addr, csrow->page_mask);
                debugf1("    nr_pages: %u  first_page: 0x%lx "
                        "last_page: 0x%lx\n",
                        (unsigned)csrow->nr_pages,
                        csrow->first_page, csrow->last_page);

                /*
                 * determine whether CHIPKILL or JUST ECC or NO ECC is operating
                 */
                if (pvt->nbcfg & K8_NBCFG_ECC_ENABLE)
                        csrow->edac_mode =
                            (pvt->nbcfg & K8_NBCFG_CHIPKILL) ?
                            EDAC_S4ECD4ED : EDAC_SECDED;
                else
                        csrow->edac_mode = EDAC_NONE;
        }

        return empty;
}

/* get all cores on this DCT */
static void get_cpus_on_this_dct_cpumask(struct cpumask *mask, int nid)
{
        int cpu;

        for_each_online_cpu(cpu)
                if (amd_get_nb_id(cpu) == nid)
                        cpumask_set_cpu(cpu, mask);
}

/* check MCG_CTL on all the cpus on this node */
static bool amd64_nb_mce_bank_enabled_on_node(int nid)
{
        cpumask_var_t mask;
        int cpu, nbe;
        bool ret = false;

        if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
                amd64_printk(KERN_WARNING, "%s: error allocating mask\n",
                             __func__);
                return false;
        }

        get_cpus_on_this_dct_cpumask(mask, nid);

        rdmsr_on_cpus(mask, MSR_IA32_MCG_CTL, msrs);

        for_each_cpu(cpu, mask) {
                struct msr *reg = per_cpu_ptr(msrs, cpu);
                nbe = reg->l & K8_MSR_MCGCTL_NBE;

                debugf0("core: %u, MCG_CTL: 0x%llx, NB MSR is %s\n",
                        cpu, reg->q,
                        (nbe ? "enabled" : "disabled"));

                if (!nbe)
                        goto out;
        }
        ret = true;

out:
        free_cpumask_var(mask);
        return ret;
}

static int amd64_toggle_ecc_err_reporting(struct amd64_pvt *pvt, bool on)
{
        cpumask_var_t cmask;
        int cpu;

        if (!zalloc_cpumask_var(&cmask, GFP_KERNEL)) {
                amd64_printk(KERN_WARNING, "%s: error allocating mask\n",
                             __func__);
                return false;
        }

        get_cpus_on_this_dct_cpumask(cmask, pvt->mc_node_id);

        rdmsr_on_cpus(cmask, MSR_IA32_MCG_CTL, msrs);

        for_each_cpu(cpu, cmask) {

                struct msr *reg = per_cpu_ptr(msrs, cpu);

                if (on) {
                        if (reg->l & K8_MSR_MCGCTL_NBE)
                                pvt->flags.nb_mce_enable = 1;

                        reg->l |= K8_MSR_MCGCTL_NBE;
                } else {
                        /*
                         * Turn off NB MCE reporting only when it was off before
                         */
                        if (!pvt->flags.nb_mce_enable)
                                reg->l &= ~K8_MSR_MCGCTL_NBE;
                }
        }
        wrmsr_on_cpus(cmask, MSR_IA32_MCG_CTL, msrs);

        free_cpumask_var(cmask);

        return 0;
}

static void amd64_enable_ecc_error_reporting(struct mem_ctl_info *mci)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 value, mask = K8_NBCTL_CECCEn | K8_NBCTL_UECCEn;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCTL, &value);

        /* turn on UECCn and CECCEn bits */
        pvt->old_nbctl = value & mask;
        pvt->nbctl_mcgctl_saved = 1;

        value |= mask;
        pci_write_config_dword(pvt->misc_f3_ctl, K8_NBCTL, value);

        if (amd64_toggle_ecc_err_reporting(pvt, ON))
                amd64_printk(KERN_WARNING, "Error enabling ECC reporting over "
                                           "MCGCTL!\n");

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);

        debugf0("NBCFG(1)= 0x%x  CHIPKILL= %s ECC_ENABLE= %s\n", value,
                (value & K8_NBCFG_CHIPKILL) ? "Enabled" : "Disabled",
                (value & K8_NBCFG_ECC_ENABLE) ? "Enabled" : "Disabled");

        if (!(value & K8_NBCFG_ECC_ENABLE)) {
                amd64_printk(KERN_WARNING,
                        "This node reports that DRAM ECC is "
                        "currently Disabled; ENABLING now\n");

                pvt->flags.nb_ecc_prev = 0;

                /* Attempt to turn on DRAM ECC Enable */
                value |= K8_NBCFG_ECC_ENABLE;
                pci_write_config_dword(pvt->misc_f3_ctl, K8_NBCFG, value);

                amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);

                if (!(value & K8_NBCFG_ECC_ENABLE)) {
                        amd64_printk(KERN_WARNING,
                                "Hardware rejects Enabling DRAM ECC checking\n"
                                "Check memory DIMM configuration\n");
                } else {
                        amd64_printk(KERN_DEBUG,
                                "Hardware accepted DRAM ECC Enable\n");
                }
        } else {
                pvt->flags.nb_ecc_prev = 1;
        }

        debugf0("NBCFG(2)= 0x%x  CHIPKILL= %s ECC_ENABLE= %s\n", value,
                (value & K8_NBCFG_CHIPKILL) ? "Enabled" : "Disabled",
                (value & K8_NBCFG_ECC_ENABLE) ? "Enabled" : "Disabled");

        pvt->ctl_error_info.nbcfg = value;
}

static void amd64_restore_ecc_error_reporting(struct amd64_pvt *pvt)
{
        u32 value, mask = K8_NBCTL_CECCEn | K8_NBCTL_UECCEn;

        if (!pvt->nbctl_mcgctl_saved)
                return;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCTL, &value);
        value &= ~mask;
        value |= pvt->old_nbctl;

        pci_write_config_dword(pvt->misc_f3_ctl, K8_NBCTL, value);

        /* restore previous BIOS DRAM ECC "off" setting which we force-enabled */
        if (!pvt->flags.nb_ecc_prev) {
                amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);
                value &= ~K8_NBCFG_ECC_ENABLE;
                pci_write_config_dword(pvt->misc_f3_ctl, K8_NBCFG, value);
        }

        /* restore the NB Enable MCGCTL bit */
        if (amd64_toggle_ecc_err_reporting(pvt, OFF))
                amd64_printk(KERN_WARNING, "Error restoring NB MCGCTL settings!\n");
}

/*
 * EDAC requires that the BIOS have ECC enabled before taking over the
 * processing of ECC errors. This is because the BIOS can properly initialize
 * the memory system completely. A command line option allows to force-enable
 * hardware ECC later in amd64_enable_ecc_error_reporting().
 */
static const char *ecc_msg =
        "ECC disabled in the BIOS or no ECC capability, module will not load.\n"
        " Either enable ECC checking or force module loading by setting "
        "'ecc_enable_override'.\n"
        " (Note that use of the override may cause unknown side effects.)\n";

static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
{
        u32 value;
        u8 ecc_enabled = 0;
        bool nb_mce_en = false;

        amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);

        ecc_enabled = !!(value & K8_NBCFG_ECC_ENABLE);
        if (!ecc_enabled)
                amd64_printk(KERN_NOTICE, "This node reports that Memory ECC "
                             "is currently disabled, set F3x%x[22] (%s).\n",
                             K8_NBCFG, pci_name(pvt->misc_f3_ctl));
        else
                amd64_printk(KERN_INFO, "ECC is enabled by BIOS.\n");

        nb_mce_en = amd64_nb_mce_bank_enabled_on_node(pvt->mc_node_id);
        if (!nb_mce_en)
                amd64_printk(KERN_NOTICE, "NB MCE bank disabled, set MSR "
                             "0x%08x[4] on node %d to enable.\n",
                             MSR_IA32_MCG_CTL, pvt->mc_node_id);

        if (!ecc_enabled || !nb_mce_en) {
                if (!ecc_enable_override) {
                        amd64_printk(KERN_NOTICE, "%s", ecc_msg);
                        return -ENODEV;
                } else {
                        amd64_printk(KERN_WARNING, "Forcing ECC checking on!\n");
                }
        }

        return 0;
}

struct mcidev_sysfs_attribute sysfs_attrs[ARRAY_SIZE(amd64_dbg_attrs) +
                                          ARRAY_SIZE(amd64_inj_attrs) +
                                          1];

struct mcidev_sysfs_attribute terminator = { .attr = { .name = NULL } };

static void amd64_set_mc_sysfs_attributes(struct mem_ctl_info *mci)
{
        unsigned int i = 0, j = 0;

        for (; i < ARRAY_SIZE(amd64_dbg_attrs); i++)
                sysfs_attrs[i] = amd64_dbg_attrs[i];

        for (j = 0; j < ARRAY_SIZE(amd64_inj_attrs); j++, i++)
                sysfs_attrs[i] = amd64_inj_attrs[j];

        sysfs_attrs[i] = terminator;

        mci->mc_driver_sysfs_attributes = sysfs_attrs;
}

static void amd64_setup_mci_misc_attributes(struct mem_ctl_info *mci)
{
        struct amd64_pvt *pvt = mci->pvt_info;

        mci->mtype_cap          = MEM_FLAG_DDR2 | MEM_FLAG_RDDR2;
        mci->edac_ctl_cap       = EDAC_FLAG_NONE;

        if (pvt->nbcap & K8_NBCAP_SECDED)
                mci->edac_ctl_cap |= EDAC_FLAG_SECDED;

        if (pvt->nbcap & K8_NBCAP_CHIPKILL)
                mci->edac_ctl_cap |= EDAC_FLAG_S4ECD4ED;

        mci->edac_cap           = amd64_determine_edac_cap(pvt);
        mci->mod_name           = EDAC_MOD_STR;
        mci->mod_ver            = EDAC_AMD64_VERSION;
        mci->ctl_name           = get_amd_family_name(pvt->mc_type_index);
        mci->dev_name           = pci_name(pvt->dram_f2_ctl);
        mci->ctl_page_to_phys   = NULL;

        /* IMPORTANT: Set the polling 'check' function in this module */
        mci->edac_check         = amd64_check;

        /* memory scrubber interface */
        mci->set_sdram_scrub_rate = amd64_set_scrub_rate;
        mci->get_sdram_scrub_rate = amd64_get_scrub_rate;
}

/*
 * Init stuff for this DRAM Controller device.
 *
 * Due to a hardware feature on Fam10h CPUs, the Enable Extended Configuration
 * Space feature MUST be enabled on ALL Processors prior to actually reading
 * from the ECS registers. Since the loading of the module can occur on any
 * 'core', and cores don't 'see' all the other processors ECS data when the
 * others are NOT enabled. Our solution is to first enable ECS access in this
 * routine on all processors, gather some data in a amd64_pvt structure and
 * later come back in a finish-setup function to perform that final
 * initialization. See also amd64_init_2nd_stage() for that.
 */
static int amd64_probe_one_instance(struct pci_dev *dram_f2_ctl,
                                    int mc_type_index)
{
        struct amd64_pvt *pvt = NULL;
        int err = 0, ret;

        ret = -ENOMEM;
        pvt = kzalloc(sizeof(struct amd64_pvt), GFP_KERNEL);
        if (!pvt)
                goto err_exit;

        pvt->mc_node_id = get_node_id(dram_f2_ctl);

        pvt->dram_f2_ctl        = dram_f2_ctl;
        pvt->ext_model          = boot_cpu_data.x86_model >> 4;
        pvt->mc_type_index      = mc_type_index;
        pvt->ops                = family_ops(mc_type_index);

        /*
         * We have the dram_f2_ctl device as an argument, now go reserve its
         * sibling devices from the PCI system.
         */
        ret = -ENODEV;
        err = amd64_reserve_mc_sibling_devices(pvt, mc_type_index);
        if (err)
                goto err_free;

        ret = -EINVAL;
        err = amd64_check_ecc_enabled(pvt);
        if (err)
                goto err_put;

        /*
         * Key operation here: setup of HW prior to performing ops on it. Some
         * setup is required to access ECS data. After this is performed, the
         * 'teardown' function must be called upon error and normal exit paths.
         */
        if (boot_cpu_data.x86 >= 0x10)
                amd64_setup(pvt);

        /*
         * Save the pointer to the private data for use in 2nd initialization
         * stage
         */
        pvt_lookup[pvt->mc_node_id] = pvt;

        return 0;

err_put:
        amd64_free_mc_sibling_devices(pvt);

err_free:
        kfree(pvt);

err_exit:
        return ret;
}

/*
 * This is the finishing stage of the init code. Needs to be performed after all
 * MCs' hardware have been prepped for accessing extended config space.
 */
static int amd64_init_2nd_stage(struct amd64_pvt *pvt)
{
        int node_id = pvt->mc_node_id;
        struct mem_ctl_info *mci;
        int ret = -ENODEV;

        amd64_read_mc_registers(pvt);

        /*
         * We need to determine how many memory channels there are. Then use
         * that information for calculating the size of the dynamic instance
         * tables in the 'mci' structure
         */
        pvt->channel_count = pvt->ops->early_channel_count(pvt);
        if (pvt->channel_count < 0)
                goto err_exit;

        ret = -ENOMEM;
        mci = edac_mc_alloc(0, pvt->cs_count, pvt->channel_count, node_id);
        if (!mci)
                goto err_exit;

        mci->pvt_info = pvt;

        mci->dev = &pvt->dram_f2_ctl->dev;
        amd64_setup_mci_misc_attributes(mci);

        if (amd64_init_csrows(mci))
                mci->edac_cap = EDAC_FLAG_NONE;

        amd64_enable_ecc_error_reporting(mci);
        amd64_set_mc_sysfs_attributes(mci);

        ret = -ENODEV;
        if (edac_mc_add_mc(mci)) {
                debugf1("failed edac_mc_add_mc()\n");
                goto err_add_mc;
        }

        mci_lookup[node_id] = mci;
        pvt_lookup[node_id] = NULL;

        /* register stuff with EDAC MCE */
        if (report_gart_errors)
                amd_report_gart_errors(true);

        amd_register_ecc_decoder(amd64_decode_bus_error);

        return 0;

err_add_mc:
        edac_mc_free(mci);

err_exit:
        debugf0("failure to init 2nd stage: ret=%d\n", ret);

        amd64_restore_ecc_error_reporting(pvt);

        if (boot_cpu_data.x86 > 0xf)
                amd64_teardown(pvt);

        amd64_free_mc_sibling_devices(pvt);

        kfree(pvt_lookup[pvt->mc_node_id]);
        pvt_lookup[node_id] = NULL;

        return ret;
}


static int __devinit amd64_init_one_instance(struct pci_dev *pdev,
                                 const struct pci_device_id *mc_type)
{
        int ret = 0;

        debugf0("(MC node=%d,mc_type='%s')\n", get_node_id(pdev),
                get_amd_family_name(mc_type->driver_data));

        ret = pci_enable_device(pdev);
        if (ret < 0)
                ret = -EIO;
        else
                ret = amd64_probe_one_instance(pdev, mc_type->driver_data);

        if (ret < 0)
                debugf0("ret=%d\n", ret);

        return ret;
}

static void __devexit amd64_remove_one_instance(struct pci_dev *pdev)
{
        struct mem_ctl_info *mci;
        struct amd64_pvt *pvt;

        /* Remove from EDAC CORE tracking list */
        mci = edac_mc_del_mc(&pdev->dev);
        if (!mci)
                return;

        pvt = mci->pvt_info;

        amd64_restore_ecc_error_reporting(pvt);

        if (boot_cpu_data.x86 > 0xf)
                amd64_teardown(pvt);

        amd64_free_mc_sibling_devices(pvt);

        /* unregister from EDAC MCE */
        amd_report_gart_errors(false);
        amd_unregister_ecc_decoder(amd64_decode_bus_error);

        /* Free the EDAC CORE resources */
        mci->pvt_info = NULL;
        mci_lookup[pvt->mc_node_id] = NULL;

        kfree(pvt);
        edac_mc_free(mci);
}

/*
 * This table is part of the interface for loading drivers for PCI devices. The
 * PCI core identifies what devices are on a system during boot, and then
 * inquiry this table to see if this driver is for a given device found.
 */
static const struct pci_device_id amd64_pci_table[] __devinitdata = {
        {
                .vendor         = PCI_VENDOR_ID_AMD,
                .device         = PCI_DEVICE_ID_AMD_K8_NB_MEMCTL,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
                .class          = 0,
                .class_mask     = 0,
                .driver_data    = K8_CPUS
        },
        {
                .vendor         = PCI_VENDOR_ID_AMD,
                .device         = PCI_DEVICE_ID_AMD_10H_NB_DRAM,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
                .class          = 0,
                .class_mask     = 0,
                .driver_data    = F10_CPUS
        },
        {
                .vendor         = PCI_VENDOR_ID_AMD,
                .device         = PCI_DEVICE_ID_AMD_11H_NB_DRAM,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
                .class          = 0,
                .class_mask     = 0,
                .driver_data    = F11_CPUS
        },
        {0, }
};
MODULE_DEVICE_TABLE(pci, amd64_pci_table);

static struct pci_driver amd64_pci_driver = {
        .name           = EDAC_MOD_STR,
        .probe          = amd64_init_one_instance,
        .remove         = __devexit_p(amd64_remove_one_instance),
        .id_table       = amd64_pci_table,
};

static void amd64_setup_pci_device(void)
{
        struct mem_ctl_info *mci;
        struct amd64_pvt *pvt;

        if (amd64_ctl_pci)
                return;

        mci = mci_lookup[0];
        if (mci) {

                pvt = mci->pvt_info;
                amd64_ctl_pci =
                        edac_pci_create_generic_ctl(&pvt->dram_f2_ctl->dev,
                                                    EDAC_MOD_STR);

                if (!amd64_ctl_pci) {
                        pr_warning("%s(): Unable to create PCI control\n",
                                   __func__);

                        pr_warning("%s(): PCI error report via EDAC not set\n",
                                   __func__);
                        }
        }
}

static int __init amd64_edac_init(void)
{
        int nb, err = -ENODEV;
        bool load_ok = false;

        edac_printk(KERN_INFO, EDAC_MOD_STR, EDAC_AMD64_VERSION "\n");

        opstate_init();

        if (cache_k8_northbridges() < 0)
                goto err_ret;

        msrs = msrs_alloc();
        if (!msrs)
                goto err_ret;

        err = pci_register_driver(&amd64_pci_driver);
        if (err)
                goto err_pci;

        /*
         * At this point, the array 'pvt_lookup[]' contains pointers to alloc'd
         * amd64_pvt structs. These will be used in the 2nd stage init function
         * to finish initialization of the MC instances.
         */
        err = -ENODEV;
        for (nb = 0; nb < num_k8_northbridges; nb++) {
                if (!pvt_lookup[nb])
                        continue;

                err = amd64_init_2nd_stage(pvt_lookup[nb]);
                if (err)
                        goto err_2nd_stage;

                load_ok = true;
        }

        if (load_ok) {
                amd64_setup_pci_device();
                return 0;
        }

err_2nd_stage:
        pci_unregister_driver(&amd64_pci_driver);
err_pci:
        msrs_free(msrs);
        msrs = NULL;
err_ret:
        return err;
}

static void __exit amd64_edac_exit(void)
{
        if (amd64_ctl_pci)
                edac_pci_release_generic_ctl(amd64_ctl_pci);

        pci_unregister_driver(&amd64_pci_driver);

        msrs_free(msrs);
        msrs = NULL;
}

module_init(amd64_edac_init);
module_exit(amd64_edac_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("SoftwareBitMaker: Doug Thompson, "
                "Dave Peterson, Thayne Harbaugh");
MODULE_DESCRIPTION("MC support for AMD64 memory controllers - "
                EDAC_AMD64_VERSION);

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