thp: avoid dumping huge zero page

[linux-2.6/libata-dev.git] / drivers / edac / amd64_edac.c

#include "amd64_edac.h"
#include <asm/amd_nb.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;

/*
 * count successfully initialized driver instances for setup_pci_device()
 */
static atomic_t drv_instances = ATOMIC_INIT(0);

/* Per-node driver instances */
static struct mem_ctl_info **mcis;
static struct ecc_settings **ecc_stngs;

/*
 * 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 {
       u32 scrubval;           /* bit pattern for scrub rate */
       u32 bandwidth;          /* bandwidth consumed (bytes/sec) */
} 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 */
};

int __amd64_read_pci_cfg_dword(struct pci_dev *pdev, int offset,
                               u32 *val, const char *func)
{
        int err = 0;

        err = pci_read_config_dword(pdev, offset, val);
        if (err)
                amd64_warn("%s: error reading F%dx%03x.\n",
                           func, PCI_FUNC(pdev->devfn), offset);

        return err;
}

int __amd64_write_pci_cfg_dword(struct pci_dev *pdev, int offset,
                                u32 val, const char *func)
{
        int err = 0;

        err = pci_write_config_dword(pdev, offset, val);
        if (err)
                amd64_warn("%s: error writing to F%dx%03x.\n",
                           func, PCI_FUNC(pdev->devfn), offset);

        return err;
}

/*
 *
 * Depending on the family, F2 DCT reads need special handling:
 *
 * K8: has a single DCT only
 *
 * F10h: each DCT has its own set of regs
 *      DCT0 -> F2x040..
 *      DCT1 -> F2x140..
 *
 * F15h: we select which DCT we access using F1x10C[DctCfgSel]
 *
 */
static int k8_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
                               const char *func)
{
        if (addr >= 0x100)
                return -EINVAL;

        return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
}

static int f10_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
                                 const char *func)
{
        return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
}

/*
 * Select DCT to which PCI cfg accesses are routed
 */
static void f15h_select_dct(struct amd64_pvt *pvt, u8 dct)
{
        u32 reg = 0;

        amd64_read_pci_cfg(pvt->F1, DCT_CFG_SEL, &reg);
        reg &= 0xfffffffe;
        reg |= dct;
        amd64_write_pci_cfg(pvt->F1, DCT_CFG_SEL, reg);
}

static int f15_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
                                 const char *func)
{
        u8 dct  = 0;

        if (addr >= 0x140 && addr <= 0x1a0) {
                dct   = 1;
                addr -= 0x100;
        }

        f15h_select_dct(pvt, dct);

        return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
}

/*
 * 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_set_scrub_rate(struct pci_dev *ctl, u32 new_bw, u32 min_rate)
{
        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.
         *
         * If no suitable bandwidth is found, turn off DRAM scrubbing entirely
         * by falling back to the last element in scrubrates[].
         */
        for (i = 0; i < ARRAY_SIZE(scrubrates) - 1; i++) {
                /*
                 * skip scrub rates which aren't recommended
                 * (see F10 BKDG, F3x58)
                 */
                if (scrubrates[i].scrubval < min_rate)
                        continue;

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

        scrubval = scrubrates[i].scrubval;

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

        if (scrubval)
                return scrubrates[i].bandwidth;

        return 0;
}

static int amd64_set_scrub_rate(struct mem_ctl_info *mci, u32 bw)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 min_scrubrate = 0x5;

        if (boot_cpu_data.x86 == 0xf)
                min_scrubrate = 0x0;

        /* F15h Erratum #505 */
        if (boot_cpu_data.x86 == 0x15)
                f15h_select_dct(pvt, 0);

        return __amd64_set_scrub_rate(pvt->F3, bw, min_scrubrate);
}

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

        /* F15h Erratum #505 */
        if (boot_cpu_data.x86 == 0x15)
                f15h_select_dct(pvt, 0);

        amd64_read_pci_cfg(pvt->F3, SCRCTRL, &scrubval);

        scrubval = scrubval & 0x001F;

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

/*
 * returns true if the SysAddr given by sys_addr matches the
 * DRAM base/limit associated with node_id
 */
static bool amd64_base_limit_match(struct amd64_pvt *pvt, u64 sys_addr,
                                   unsigned nid)
{
        u64 addr;

        /* 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 >= get_dram_base(pvt, nid)) &&
                (addr <= get_dram_limit(pvt, nid)));
}

/*
 * 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;
        unsigned 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 = dram_intlv_en(pvt, 0);

        if (intlv_en == 0) {
                for (node_id = 0; node_id < DRAM_RANGES; 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_warn("DRAM Base[IntlvEn] junk value: 0x%x, BIOS bug?\n", intlv_en);
                return NULL;
        }

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

        for (node_id = 0; ; ) {
                if ((dram_intlv_sel(pvt, node_id) & intlv_en) == bits)
                        break;  /* intlv_sel field matches */

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

        /* sanity test for sys_addr */
        if (unlikely(!amd64_base_limit_match(pvt, sys_addr, node_id))) {
                amd64_warn("%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((int)node_id);

err_no_match:
        edac_dbg(2, "sys_addr 0x%lx doesn't match any node\n",
                 (unsigned long)sys_addr);

        return NULL;
}

/*
 * compute the CS base address of the @csrow on the DRAM controller @dct.
 * For details see F2x[5C:40] in the processor's BKDG
 */
static void get_cs_base_and_mask(struct amd64_pvt *pvt, int csrow, u8 dct,
                                 u64 *base, u64 *mask)
{
        u64 csbase, csmask, base_bits, mask_bits;
        u8 addr_shift;

        if (boot_cpu_data.x86 == 0xf && pvt->ext_model < K8_REV_F) {
                csbase          = pvt->csels[dct].csbases[csrow];
                csmask          = pvt->csels[dct].csmasks[csrow];
                base_bits       = GENMASK(21, 31) | GENMASK(9, 15);
                mask_bits       = GENMASK(21, 29) | GENMASK(9, 15);
                addr_shift      = 4;
        } else {
                csbase          = pvt->csels[dct].csbases[csrow];
                csmask          = pvt->csels[dct].csmasks[csrow >> 1];
                addr_shift      = 8;

                if (boot_cpu_data.x86 == 0x15)
                        base_bits = mask_bits = GENMASK(19,30) | GENMASK(5,13);
                else
                        base_bits = mask_bits = GENMASK(19,28) | GENMASK(5,13);
        }

        *base  = (csbase & base_bits) << addr_shift;

        *mask  = ~0ULL;
        /* poke holes for the csmask */
        *mask &= ~(mask_bits << addr_shift);
        /* OR them in */
        *mask |= (csmask & mask_bits) << addr_shift;
}

#define for_each_chip_select(i, dct, pvt) \
        for (i = 0; i < pvt->csels[dct].b_cnt; i++)

#define chip_select_base(i, dct, pvt) \
        pvt->csels[dct].csbases[i]

#define for_each_chip_select_mask(i, dct, pvt) \
        for (i = 0; i < pvt->csels[dct].m_cnt; i++)

/*
 * @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;

        for_each_chip_select(csrow, 0, pvt) {
                if (!csrow_enabled(csrow, 0, pvt))
                        continue;

                get_cs_base_and_mask(pvt, csrow, 0, &base, &mask);

                mask = ~mask;

                if ((input_addr & mask) == (base & mask)) {
                        edac_dbg(2, "InputAddr 0x%lx matches csrow %d (node %d)\n",
                                 (unsigned long)input_addr, csrow,
                                 pvt->mc_node_id);

                        return csrow;
                }
        }
        edac_dbg(2, "no matching csrow for InputAddr 0x%lx (MC node %d)\n",
                 (unsigned long)input_addr, pvt->mc_node_id);

        return -1;
}

/*
 * 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;

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

        /* valid for Fam10h and above */
        if (boot_cpu_data.x86 >= 0x10 && !dhar_mem_hoist_valid(pvt)) {
                edac_dbg(1, "  Dram Memory Hoisting is DISABLED on this system\n");
                return 1;
        }

        if (!dhar_valid(pvt)) {
                edac_dbg(1, "  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.
         */

        *hole_base = dhar_base(pvt);
        *hole_size = (1ULL << 32) - *hole_base;

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

        edac_dbg(1, "  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)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u64 dram_base, hole_base, hole_offset, hole_size, dram_addr;
        int ret;

        dram_base = get_dram_base(pvt, pvt->mc_node_id);

        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;

                        edac_dbg(2, "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 & GENMASK(0, 39)) - dram_base;

        edac_dbg(2, "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(dram_intlv_en(pvt, 0));
        input_addr = ((dram_addr >> intlv_shift) & GENMASK(12, 35)) +
                      (dram_addr & 0xfff);

        edac_dbg(2, "  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));

        edac_dbg(2, "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;
        unsigned 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 > 7);

        intlv_shift = num_node_interleave_bits(dram_intlv_en(pvt, 0));
        if (intlv_shift == 0) {
                edac_dbg(1, "    InputAddr 0x%lx translates to DramAddr of same value\n",
                         (unsigned long)input_addr);

                return input_addr;
        }

        bits = ((input_addr & GENMASK(12, 35)) << intlv_shift) +
                (input_addr & 0xfff);

        intlv_sel = dram_intlv_sel(pvt, node_id) & ((1 << intlv_shift) - 1);
        dram_addr = bits + (intlv_sel << 12);

        edac_dbg(1, "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, 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;

                        edac_dbg(1, "using DHAR to translate DramAddr 0x%lx to SysAddr 0x%lx\n",
                                 (unsigned long)dram_addr,
                                 (unsigned long)sys_addr);

                        return sys_addr;
                }
        }

        base     = get_dram_base(pvt, pvt->mc_node_id);
        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);

        edac_dbg(1, "    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));
}

/* Map the Error address to a PAGE and PAGE OFFSET. */
static inline void error_address_to_page_and_offset(u64 error_address,
                                                    struct err_info *err)
{
        err->page = (u32) (error_address >> PAGE_SHIFT);
        err->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_err(mci, "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);

/*
 * Determine if the DIMMs have ECC enabled. ECC is enabled ONLY if all the DIMMs
 * are ECC capable.
 */
static unsigned long amd64_determine_edac_cap(struct amd64_pvt *pvt)
{
        u8 bit;
        unsigned long 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(struct amd64_pvt *, u8);

static void amd64_dump_dramcfg_low(u32 dclr, int chan)
{
        edac_dbg(1, "F2x%d90 (DRAM Cfg Low): 0x%08x\n", chan, dclr);

        edac_dbg(1, "  DIMM type: %sbuffered; all DIMMs support ECC: %s\n",
                 (dclr & BIT(16)) ?  "un" : "",
                 (dclr & BIT(19)) ? "yes" : "no");

        edac_dbg(1, "  PAR/ERR parity: %s\n",
                 (dclr & BIT(8)) ?  "enabled" : "disabled");

        if (boot_cpu_data.x86 == 0x10)
                edac_dbg(1, "  DCT 128bit mode width: %s\n",
                         (dclr & BIT(11)) ?  "128b" : "64b");

        edac_dbg(1, "  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 dump_misc_regs(struct amd64_pvt *pvt)
{
        edac_dbg(1, "F3xE8 (NB Cap): 0x%08x\n", pvt->nbcap);

        edac_dbg(1, "  NB two channel DRAM capable: %s\n",
                 (pvt->nbcap & NBCAP_DCT_DUAL) ? "yes" : "no");

        edac_dbg(1, "  ECC capable: %s, ChipKill ECC capable: %s\n",
                 (pvt->nbcap & NBCAP_SECDED) ? "yes" : "no",
                 (pvt->nbcap & NBCAP_CHIPKILL) ? "yes" : "no");

        amd64_dump_dramcfg_low(pvt->dclr0, 0);

        edac_dbg(1, "F3xB0 (Online Spare): 0x%08x\n", pvt->online_spare);

        edac_dbg(1, "F1xF0 (DRAM Hole Address): 0x%08x, base: 0x%08x, offset: 0x%08x\n",
                 pvt->dhar, dhar_base(pvt),
                 (boot_cpu_data.x86 == 0xf) ? k8_dhar_offset(pvt)
                 : f10_dhar_offset(pvt));

        edac_dbg(1, "  DramHoleValid: %s\n", dhar_valid(pvt) ? "yes" : "no");

        amd64_debug_display_dimm_sizes(pvt, 0);

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

        amd64_debug_display_dimm_sizes(pvt, 1);

        amd64_info("using %s syndromes.\n", ((pvt->ecc_sym_sz == 8) ? "x8" : "x4"));

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

/*
 * see BKDG, F2x[1,0][5C:40], F2[1,0][6C:60]
 */
static void prep_chip_selects(struct amd64_pvt *pvt)
{
        if (boot_cpu_data.x86 == 0xf && pvt->ext_model < K8_REV_F) {
                pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 8;
                pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 8;
        } else {
                pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 8;
                pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 4;
        }
}

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

        prep_chip_selects(pvt);

        for_each_chip_select(cs, 0, pvt) {
                int reg0   = DCSB0 + (cs * 4);
                int reg1   = DCSB1 + (cs * 4);
                u32 *base0 = &pvt->csels[0].csbases[cs];
                u32 *base1 = &pvt->csels[1].csbases[cs];

                if (!amd64_read_dct_pci_cfg(pvt, reg0, base0))
                        edac_dbg(0, "  DCSB0[%d]=0x%08x reg: F2x%x\n",
                                 cs, *base0, reg0);

                if (boot_cpu_data.x86 == 0xf || dct_ganging_enabled(pvt))
                        continue;

                if (!amd64_read_dct_pci_cfg(pvt, reg1, base1))
                        edac_dbg(0, "  DCSB1[%d]=0x%08x reg: F2x%x\n",
                                 cs, *base1, reg1);
        }

        for_each_chip_select_mask(cs, 0, pvt) {
                int reg0   = DCSM0 + (cs * 4);
                int reg1   = DCSM1 + (cs * 4);
                u32 *mask0 = &pvt->csels[0].csmasks[cs];
                u32 *mask1 = &pvt->csels[1].csmasks[cs];

                if (!amd64_read_dct_pci_cfg(pvt, reg0, mask0))
                        edac_dbg(0, "    DCSM0[%d]=0x%08x reg: F2x%x\n",
                                 cs, *mask0, reg0);

                if (boot_cpu_data.x86 == 0xf || dct_ganging_enabled(pvt))
                        continue;

                if (!amd64_read_dct_pci_cfg(pvt, reg1, mask1))
                        edac_dbg(0, "    DCSM1[%d]=0x%08x reg: F2x%x\n",
                                 cs, *mask1, reg1);
        }
}

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

        /* F15h supports only DDR3 */
        if (boot_cpu_data.x86 >= 0x15)
                type = (pvt->dclr0 & BIT(16)) ? MEM_DDR3 : MEM_RDDR3;
        else 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;
        }

        amd64_info("CS%d: %s\n", cs, edac_mem_types[type]);

        return type;
}

/* Get the number of DCT channels the memory controller is using. */
static int k8_early_channel_count(struct amd64_pvt *pvt)
{
        int flag;

        if (pvt->ext_model >= K8_REV_F)
                /* RevF (NPT) and later */
                flag = pvt->dclr0 & WIDTH_128;
        else
                /* RevE and earlier */
                flag = pvt->dclr0 & REVE_WIDTH_128;

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

        return (flag) ? 2 : 1;
}

/* On F10h and later ErrAddr is MC4_ADDR[47:1] */
static u64 get_error_address(struct mce *m)
{
        struct cpuinfo_x86 *c = &boot_cpu_data;
        u64 addr;
        u8 start_bit = 1;
        u8 end_bit   = 47;

        if (c->x86 == 0xf) {
                start_bit = 3;
                end_bit   = 39;
        }

        addr = m->addr & GENMASK(start_bit, end_bit);

        /*
         * Erratum 637 workaround
         */
        if (c->x86 == 0x15) {
                struct amd64_pvt *pvt;
                u64 cc6_base, tmp_addr;
                u32 tmp;
                u8 mce_nid, intlv_en;

                if ((addr & GENMASK(24, 47)) >> 24 != 0x00fdf7)
                        return addr;

                mce_nid = amd_get_nb_id(m->extcpu);
                pvt     = mcis[mce_nid]->pvt_info;

                amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_LIM, &tmp);
                intlv_en = tmp >> 21 & 0x7;

                /* add [47:27] + 3 trailing bits */
                cc6_base  = (tmp & GENMASK(0, 20)) << 3;

                /* reverse and add DramIntlvEn */
                cc6_base |= intlv_en ^ 0x7;

                /* pin at [47:24] */
                cc6_base <<= 24;

                if (!intlv_en)
                        return cc6_base | (addr & GENMASK(0, 23));

                amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_BASE, &tmp);

                                                        /* faster log2 */
                tmp_addr  = (addr & GENMASK(12, 23)) << __fls(intlv_en + 1);

                /* OR DramIntlvSel into bits [14:12] */
                tmp_addr |= (tmp & GENMASK(21, 23)) >> 9;

                /* add remaining [11:0] bits from original MC4_ADDR */
                tmp_addr |= addr & GENMASK(0, 11);

                return cc6_base | tmp_addr;
        }

        return addr;
}

static void read_dram_base_limit_regs(struct amd64_pvt *pvt, unsigned range)
{
        struct cpuinfo_x86 *c = &boot_cpu_data;
        int off = range << 3;

        amd64_read_pci_cfg(pvt->F1, DRAM_BASE_LO + off,  &pvt->ranges[range].base.lo);
        amd64_read_pci_cfg(pvt->F1, DRAM_LIMIT_LO + off, &pvt->ranges[range].lim.lo);

        if (c->x86 == 0xf)
                return;

        if (!dram_rw(pvt, range))
                return;

        amd64_read_pci_cfg(pvt->F1, DRAM_BASE_HI + off,  &pvt->ranges[range].base.hi);
        amd64_read_pci_cfg(pvt->F1, DRAM_LIMIT_HI + off, &pvt->ranges[range].lim.hi);

        /* Factor in CC6 save area by reading dst node's limit reg */
        if (c->x86 == 0x15) {
                struct pci_dev *f1 = NULL;
                u8 nid = dram_dst_node(pvt, range);
                u32 llim;

                f1 = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0x18 + nid, 1));
                if (WARN_ON(!f1))
                        return;

                amd64_read_pci_cfg(f1, DRAM_LOCAL_NODE_LIM, &llim);

                pvt->ranges[range].lim.lo &= GENMASK(0, 15);

                                            /* {[39:27],111b} */
                pvt->ranges[range].lim.lo |= ((llim & 0x1fff) << 3 | 0x7) << 16;

                pvt->ranges[range].lim.hi &= GENMASK(0, 7);

                                            /* [47:40] */
                pvt->ranges[range].lim.hi |= llim >> 13;

                pci_dev_put(f1);
        }
}

static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
                                    struct err_info *err)
{
        struct amd64_pvt *pvt = mci->pvt_info;

        error_address_to_page_and_offset(sys_addr, err);

        /*
         * Find out which node the error address belongs to. This may be
         * different from the node that detected the error.
         */
        err->src_mci = find_mc_by_sys_addr(mci, sys_addr);
        if (!err->src_mci) {
                amd64_mc_err(mci, "failed to map error addr 0x%lx to a node\n",
                             (unsigned long)sys_addr);
                err->err_code = ERR_NODE;
                return;
        }

        /* Now map the sys_addr to a CSROW */
        err->csrow = sys_addr_to_csrow(err->src_mci, sys_addr);
        if (err->csrow < 0) {
                err->err_code = ERR_CSROW;
                return;
        }

        /* CHIPKILL enabled */
        if (pvt->nbcfg & NBCFG_CHIPKILL) {
                err->channel = get_channel_from_ecc_syndrome(mci, err->syndrome);
                if (err->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_warn(err->src_mci, "unknown syndrome 0x%04x - "
                                      "possible error reporting race\n",
                                      err->syndrome);
                        err->err_code = ERR_CHANNEL;
                        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)
                 */
                err->channel = ((sys_addr & BIT(3)) != 0);
        }
}

static int ddr2_cs_size(unsigned i, bool dct_width)
{
        unsigned shift = 0;

        if (i <= 2)
                shift = i;
        else if (!(i & 0x1))
                shift = i >> 1;
        else
                shift = (i + 1) >> 1;

        return 128 << (shift + !!dct_width);
}

static int k8_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
                                  unsigned cs_mode)
{
        u32 dclr = dct ? pvt->dclr1 : pvt->dclr0;

        if (pvt->ext_model >= K8_REV_F) {
                WARN_ON(cs_mode > 11);
                return ddr2_cs_size(cs_mode, dclr & WIDTH_128);
        }
        else if (pvt->ext_model >= K8_REV_D) {
                unsigned diff;
                WARN_ON(cs_mode > 10);

                /*
                 * the below calculation, besides trying to win an obfuscated C
                 * contest, maps cs_mode values to DIMM chip select sizes. The
                 * mappings are:
                 *
                 * cs_mode      CS size (mb)
                 * =======      ============
                 * 0            32
                 * 1            64
                 * 2            128
                 * 3            128
                 * 4            256
                 * 5            512
                 * 6            256
                 * 7            512
                 * 8            1024
                 * 9            1024
                 * 10           2048
                 *
                 * Basically, it calculates a value with which to shift the
                 * smallest CS size of 32MB.
                 *
                 * ddr[23]_cs_size have a similar purpose.
                 */
                diff = cs_mode/3 + (unsigned)(cs_mode > 5);

                return 32 << (cs_mode - diff);
        }
        else {
                WARN_ON(cs_mode > 6);
                return 32 << 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 f1x_early_channel_count(struct amd64_pvt *pvt)
{
        int i, j, channels = 0;

        /* On F10h, if we are in 128 bit mode, then we are using 2 channels */
        if (boot_cpu_data.x86 == 0x10 && (pvt->dclr0 & WIDTH_128))
                return 2;

        /*
         * 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.
         */
        edac_dbg(0, "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 < 2; i++) {
                u32 dbam = (i ? pvt->dbam1 : pvt->dbam0);

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

        if (channels > 2)
                channels = 2;

        amd64_info("MCT channel count: %d\n", channels);

        return channels;
}

static int ddr3_cs_size(unsigned i, bool dct_width)
{
        unsigned shift = 0;
        int cs_size = 0;

        if (i == 0 || i == 3 || i == 4)
                cs_size = -1;
        else if (i <= 2)
                shift = i;
        else if (i == 12)
                shift = 7;
        else if (!(i & 0x1))
                shift = i >> 1;
        else
                shift = (i + 1) >> 1;

        if (cs_size != -1)
                cs_size = (128 * (1 << !!dct_width)) << shift;

        return cs_size;
}

static int f10_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
                                   unsigned cs_mode)
{
        u32 dclr = dct ? pvt->dclr1 : pvt->dclr0;

        WARN_ON(cs_mode > 11);

        if (pvt->dchr0 & DDR3_MODE || pvt->dchr1 & DDR3_MODE)
                return ddr3_cs_size(cs_mode, dclr & WIDTH_128);
        else
                return ddr2_cs_size(cs_mode, dclr & WIDTH_128);
}

/*
 * F15h supports only 64bit DCT interfaces
 */
static int f15_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
                                   unsigned cs_mode)
{
        WARN_ON(cs_mode > 12);

        return ddr3_cs_size(cs_mode, false);
}

static void read_dram_ctl_register(struct amd64_pvt *pvt)
{

        if (boot_cpu_data.x86 == 0xf)
                return;

        if (!amd64_read_dct_pci_cfg(pvt, DCT_SEL_LO, &pvt->dct_sel_lo)) {
                edac_dbg(0, "F2x110 (DCTSelLow): 0x%08x, High range addrs at: 0x%x\n",
                         pvt->dct_sel_lo, dct_sel_baseaddr(pvt));

                edac_dbg(0, "  DCTs operate in %s mode\n",
                         (dct_ganging_enabled(pvt) ? "ganged" : "unganged"));

                if (!dct_ganging_enabled(pvt))
                        edac_dbg(0, "  Address range split per DCT: %s\n",
                                 (dct_high_range_enabled(pvt) ? "yes" : "no"));

                edac_dbg(0, "  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"));

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

        amd64_read_dct_pci_cfg(pvt, DCT_SEL_HI, &pvt->dct_sel_hi);
}

/*
 * Determine channel (DCT) based on the interleaving mode: F10h BKDG, 2.8.9 Memory
 * Interleaving Modes.
 */
static u8 f1x_determine_channel(struct amd64_pvt *pvt, u64 sys_addr,
                                bool hi_range_sel, u8 intlv_en)
{
        u8 dct_sel_high = (pvt->dct_sel_lo >> 1) & 1;

        if (dct_ganging_enabled(pvt))
                return 0;

        if (hi_range_sel)
                return dct_sel_high;

        /*
         * see F2x110[DctSelIntLvAddr] - channel interleave mode
         */
        if (dct_interleave_enabled(pvt)) {
                u8 intlv_addr = dct_sel_interleave_addr(pvt);

                /* return DCT select function: 0=DCT0, 1=DCT1 */
                if (!intlv_addr)
                        return sys_addr >> 6 & 1;

                if (intlv_addr & 0x2) {
                        u8 shift = intlv_addr & 0x1 ? 9 : 6;
                        u32 temp = hweight_long((u32) ((sys_addr >> 16) & 0x1F)) % 2;

                        return ((sys_addr >> shift) & 1) ^ temp;
                }

                return (sys_addr >> (12 + hweight8(intlv_en))) & 1;
        }

        if (dct_high_range_enabled(pvt))
                return ~dct_sel_high & 1;

        return 0;
}

/* Convert the sys_addr to the normalized DCT address */
static u64 f1x_get_norm_dct_addr(struct amd64_pvt *pvt, unsigned range,
                                 u64 sys_addr, bool hi_rng,
                                 u32 dct_sel_base_addr)
{
        u64 chan_off;
        u64 dram_base           = get_dram_base(pvt, range);
        u64 hole_off            = f10_dhar_offset(pvt);
        u64 dct_sel_base_off    = (pvt->dct_sel_hi & 0xFFFFFC00) << 16;

        if (hi_rng) {
                /*
                 * if
                 * base address of high range is below 4Gb
                 * (bits [47:27] at [31:11])
                 * DRAM address space on this DCT is hoisted above 4Gb  &&
                 * sys_addr > 4Gb
                 *
                 *      remove hole offset from sys_addr
                 * else
                 *      remove high range offset from sys_addr
                 */
                if ((!(dct_sel_base_addr >> 16) ||
                     dct_sel_base_addr < dhar_base(pvt)) &&
                    dhar_valid(pvt) &&
                    (sys_addr >= BIT_64(32)))
                        chan_off = hole_off;
                else
                        chan_off = dct_sel_base_off;
        } else {
                /*
                 * if
                 * we have a valid hole         &&
                 * sys_addr > 4Gb
                 *
                 *      remove hole
                 * else
                 *      remove dram base to normalize to DCT address
                 */
                if (dhar_valid(pvt) && (sys_addr >= BIT_64(32)))
                        chan_off = hole_off;
                else
                        chan_off = dram_base;
        }

        return (sys_addr & GENMASK(6,47)) - (chan_off & GENMASK(23,47));
}

/*
 * checks if the csrow passed in is marked as SPARED, if so returns the new
 * spare row
 */
static int f10_process_possible_spare(struct amd64_pvt *pvt, u8 dct, int csrow)
{
        int tmp_cs;

        if (online_spare_swap_done(pvt, dct) &&
            csrow == online_spare_bad_dramcs(pvt, dct)) {

                for_each_chip_select(tmp_cs, dct, pvt) {
                        if (chip_select_base(tmp_cs, dct, pvt) & 0x2) {
                                csrow = tmp_cs;
                                break;
                        }
                }
        }
        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 f1x_lookup_addr_in_dct(u64 in_addr, u32 nid, u8 dct)
{
        struct mem_ctl_info *mci;
        struct amd64_pvt *pvt;
        u64 cs_base, cs_mask;
        int cs_found = -EINVAL;
        int csrow;

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

        pvt = mci->pvt_info;

        edac_dbg(1, "input addr: 0x%llx, DCT: %d\n", in_addr, dct);

        for_each_chip_select(csrow, dct, pvt) {
                if (!csrow_enabled(csrow, dct, pvt))
                        continue;

                get_cs_base_and_mask(pvt, csrow, dct, &cs_base, &cs_mask);

                edac_dbg(1, "    CSROW=%d CSBase=0x%llx CSMask=0x%llx\n",
                         csrow, cs_base, cs_mask);

                cs_mask = ~cs_mask;

                edac_dbg(1, "    (InputAddr & ~CSMask)=0x%llx (CSBase & ~CSMask)=0x%llx\n",
                         (in_addr & cs_mask), (cs_base & cs_mask));

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

                        edac_dbg(1, " MATCH csrow=%d\n", cs_found);
                        break;
                }
        }
        return cs_found;
}

/*
 * See F2x10C. Non-interleaved graphics framebuffer memory under the 16G is
 * swapped with a region located at the bottom of memory so that the GPU can use
 * the interleaved region and thus two channels.
 */
static u64 f1x_swap_interleaved_region(struct amd64_pvt *pvt, u64 sys_addr)
{
        u32 swap_reg, swap_base, swap_limit, rgn_size, tmp_addr;

        if (boot_cpu_data.x86 == 0x10) {
                /* only revC3 and revE have that feature */
                if (boot_cpu_data.x86_model < 4 ||
                    (boot_cpu_data.x86_model < 0xa &&
                     boot_cpu_data.x86_mask < 3))
                        return sys_addr;
        }

        amd64_read_dct_pci_cfg(pvt, SWAP_INTLV_REG, &swap_reg);

        if (!(swap_reg & 0x1))
                return sys_addr;

        swap_base       = (swap_reg >> 3) & 0x7f;
        swap_limit      = (swap_reg >> 11) & 0x7f;
        rgn_size        = (swap_reg >> 20) & 0x7f;
        tmp_addr        = sys_addr >> 27;

        if (!(sys_addr >> 34) &&
            (((tmp_addr >= swap_base) &&
             (tmp_addr <= swap_limit)) ||
             (tmp_addr < rgn_size)))
                return sys_addr ^ (u64)swap_base << 27;

        return sys_addr;
}

/* For a given @dram_range, check if @sys_addr falls within it. */
static int f1x_match_to_this_node(struct amd64_pvt *pvt, unsigned range,
                                  u64 sys_addr, int *chan_sel)
{
        int cs_found = -EINVAL;
        u64 chan_addr;
        u32 dct_sel_base;
        u8 channel;
        bool high_range = false;

        u8 node_id    = dram_dst_node(pvt, range);
        u8 intlv_en   = dram_intlv_en(pvt, range);
        u32 intlv_sel = dram_intlv_sel(pvt, range);

        edac_dbg(1, "(range %d) SystemAddr= 0x%llx Limit=0x%llx\n",
                 range, sys_addr, get_dram_limit(pvt, range));

        if (dhar_valid(pvt) &&
            dhar_base(pvt) <= sys_addr &&
            sys_addr < BIT_64(32)) {
                amd64_warn("Huh? Address is in the MMIO hole: 0x%016llx\n",
                            sys_addr);
                return -EINVAL;
        }

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

        sys_addr = f1x_swap_interleaved_region(pvt, sys_addr);

        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 = true;

        channel = f1x_determine_channel(pvt, sys_addr, high_range, intlv_en);

        chan_addr = f1x_get_norm_dct_addr(pvt, range, sys_addr,
                                          high_range, dct_sel_base);

        /* Remove node interleaving, see F1x120 */
        if (intlv_en)
                chan_addr = ((chan_addr >> (12 + hweight8(intlv_en))) << 12) |
                            (chan_addr & 0xfff);

        /* remove channel interleave */
        if (dct_interleave_enabled(pvt) &&
           !dct_high_range_enabled(pvt) &&
           !dct_ganging_enabled(pvt)) {

                if (dct_sel_interleave_addr(pvt) != 1) {
                        if (dct_sel_interleave_addr(pvt) == 0x3)
                                /* hash 9 */
                                chan_addr = ((chan_addr >> 10) << 9) |
                                             (chan_addr & 0x1ff);
                        else
                                /* A[6] or hash 6 */
                                chan_addr = ((chan_addr >> 7) << 6) |
                                             (chan_addr & 0x3f);
                } else
                        /* A[12] */
                        chan_addr = ((chan_addr >> 13) << 12) |
                                     (chan_addr & 0xfff);
        }

        edac_dbg(1, "   Normalized DCT addr: 0x%llx\n", chan_addr);

        cs_found = f1x_lookup_addr_in_dct(chan_addr, node_id, channel);

        if (cs_found >= 0)
                *chan_sel = channel;

        return cs_found;
}

static int f1x_translate_sysaddr_to_cs(struct amd64_pvt *pvt, u64 sys_addr,
                                       int *chan_sel)
{
        int cs_found = -EINVAL;
        unsigned range;

        for (range = 0; range < DRAM_RANGES; range++) {

                if (!dram_rw(pvt, range))
                        continue;

                if ((get_dram_base(pvt, range)  <= sys_addr) &&
                    (get_dram_limit(pvt, range) >= sys_addr)) {

                        cs_found = f1x_match_to_this_node(pvt, range,
                                                          sys_addr, 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 f1x_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
                                     struct err_info *err)
{
        struct amd64_pvt *pvt = mci->pvt_info;

        error_address_to_page_and_offset(sys_addr, err);

        err->csrow = f1x_translate_sysaddr_to_cs(pvt, sys_addr, &err->channel);
        if (err->csrow < 0) {
                err->err_code = ERR_CSROW;
                return;
        }

        /*
         * 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))
                err->channel = get_channel_from_ecc_syndrome(mci, err->syndrome);
}

/*
 * debug routine to display the memory sizes of all logical DIMMs and its
 * CSROWs
 */
static void amd64_debug_display_dimm_sizes(struct amd64_pvt *pvt, u8 ctrl)
{
        int dimm, size0, size1;
        u32 *dcsb = ctrl ? pvt->csels[1].csbases : pvt->csels[0].csbases;
        u32 dbam  = ctrl ? pvt->dbam1 : pvt->dbam0;

        if (boot_cpu_data.x86 == 0xf) {
                /* K8 families < revF not supported yet */
               if (pvt->ext_model < K8_REV_F)
                        return;
               else
                       WARN_ON(ctrl != 0);
        }

        dbam = (ctrl && !dct_ganging_enabled(pvt)) ? pvt->dbam1 : pvt->dbam0;
        dcsb = (ctrl && !dct_ganging_enabled(pvt)) ? pvt->csels[1].csbases
                                                   : pvt->csels[0].csbases;

        edac_dbg(1, "F2x%d80 (DRAM Bank Address Mapping): 0x%08x\n",
                 ctrl, dbam);

        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] & DCSB_CS_ENABLE)
                        size0 = pvt->ops->dbam_to_cs(pvt, ctrl,
                                                     DBAM_DIMM(dimm, dbam));

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

                amd64_info(EDAC_MC ": %d: %5dMB %d: %5dMB\n",
                                dimm * 2,     size0,
                                dimm * 2 + 1, size1);
        }
}

static struct amd64_family_type amd64_family_types[] = {
        [K8_CPUS] = {
                .ctl_name = "K8",
                .f1_id = PCI_DEVICE_ID_AMD_K8_NB_ADDRMAP,
                .f3_id = PCI_DEVICE_ID_AMD_K8_NB_MISC,
                .ops = {
                        .early_channel_count    = k8_early_channel_count,
                        .map_sysaddr_to_csrow   = k8_map_sysaddr_to_csrow,
                        .dbam_to_cs             = k8_dbam_to_chip_select,
                        .read_dct_pci_cfg       = k8_read_dct_pci_cfg,
                }
        },
        [F10_CPUS] = {
                .ctl_name = "F10h",
                .f1_id = PCI_DEVICE_ID_AMD_10H_NB_MAP,
                .f3_id = PCI_DEVICE_ID_AMD_10H_NB_MISC,
                .ops = {
                        .early_channel_count    = f1x_early_channel_count,
                        .map_sysaddr_to_csrow   = f1x_map_sysaddr_to_csrow,
                        .dbam_to_cs             = f10_dbam_to_chip_select,
                        .read_dct_pci_cfg       = f10_read_dct_pci_cfg,
                }
        },
        [F15_CPUS] = {
                .ctl_name = "F15h",
                .f1_id = PCI_DEVICE_ID_AMD_15H_NB_F1,
                .f3_id = PCI_DEVICE_ID_AMD_15H_NB_F3,
                .ops = {
                        .early_channel_count    = f1x_early_channel_count,
                        .map_sysaddr_to_csrow   = f1x_map_sysaddr_to_csrow,
                        .dbam_to_cs             = f15_dbam_to_chip_select,
                        .read_dct_pci_cfg       = f15_read_dct_pci_cfg,
                }
        },
};

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, unsigned num_vecs,
                           unsigned v_dim)
{
        unsigned int i, err_sym;

        for (err_sym = 0; err_sym < num_vecs / v_dim; err_sym++) {
                u16 s = syndrome;
                unsigned v_idx =  err_sym * v_dim;
                unsigned 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;
                }
        }

        edac_dbg(0, "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;
        int err_sym = -1;

        if (pvt->ecc_sym_sz == 8)
                err_sym = decode_syndrome(syndrome, x8_vectors,
                                          ARRAY_SIZE(x8_vectors),
                                          pvt->ecc_sym_sz);
        else if (pvt->ecc_sym_sz == 4)
                err_sym = decode_syndrome(syndrome, x4_vectors,
                                          ARRAY_SIZE(x4_vectors),
                                          pvt->ecc_sym_sz);
        else {
                amd64_warn("Illegal syndrome type: %u\n", pvt->ecc_sym_sz);
                return err_sym;
        }

        return map_err_sym_to_channel(err_sym, pvt->ecc_sym_sz);
}

static void __log_bus_error(struct mem_ctl_info *mci, struct err_info *err,
                            u8 ecc_type)
{
        enum hw_event_mc_err_type err_type;
        const char *string;

        if (ecc_type == 2)
                err_type = HW_EVENT_ERR_CORRECTED;
        else if (ecc_type == 1)
                err_type = HW_EVENT_ERR_UNCORRECTED;
        else {
                WARN(1, "Something is rotten in the state of Denmark.\n");
                return;
        }

        switch (err->err_code) {
        case DECODE_OK:
                string = "";
                break;
        case ERR_NODE:
                string = "Failed to map error addr to a node";
                break;
        case ERR_CSROW:
                string = "Failed to map error addr to a csrow";
                break;
        case ERR_CHANNEL:
                string = "unknown syndrome - possible error reporting race";
                break;
        default:
                string = "WTF error";
                break;
        }

        edac_mc_handle_error(err_type, mci, 1,
                             err->page, err->offset, err->syndrome,
                             err->csrow, err->channel, -1,
                             string, "");
}

static inline void __amd64_decode_bus_error(struct mem_ctl_info *mci,
                                            struct mce *m)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u8 ecc_type = (m->status >> 45) & 0x3;
        u8 xec = XEC(m->status, 0x1f);
        u16 ec = EC(m->status);
        u64 sys_addr;
        struct err_info err;

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

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

        memset(&err, 0, sizeof(err));

        sys_addr = get_error_address(m);

        if (ecc_type == 2)
                err.syndrome = extract_syndrome(m->status);

        pvt->ops->map_sysaddr_to_csrow(mci, sys_addr, &err);

        __log_bus_error(mci, &err, ecc_type);
}

void amd64_decode_bus_error(int node_id, struct mce *m)
{
        __amd64_decode_bus_error(mcis[node_id], m);
}

/*
 * Use pvt->F2 which contains the F2 CPU PCI device to get the related
 * F1 (AddrMap) and F3 (Misc) devices. Return negative value on error.
 */
static int reserve_mc_sibling_devs(struct amd64_pvt *pvt, u16 f1_id, u16 f3_id)
{
        /* Reserve the ADDRESS MAP Device */
        pvt->F1 = pci_get_related_function(pvt->F2->vendor, f1_id, pvt->F2);
        if (!pvt->F1) {
                amd64_err("error address map device not found: "
                          "vendor %x device 0x%x (broken BIOS?)\n",
                          PCI_VENDOR_ID_AMD, f1_id);
                return -ENODEV;
        }

        /* Reserve the MISC Device */
        pvt->F3 = pci_get_related_function(pvt->F2->vendor, f3_id, pvt->F2);
        if (!pvt->F3) {
                pci_dev_put(pvt->F1);
                pvt->F1 = NULL;

                amd64_err("error F3 device not found: "
                          "vendor %x device 0x%x (broken BIOS?)\n",
                          PCI_VENDOR_ID_AMD, f3_id);

                return -ENODEV;
        }
        edac_dbg(1, "F1: %s\n", pci_name(pvt->F1));
        edac_dbg(1, "F2: %s\n", pci_name(pvt->F2));
        edac_dbg(1, "F3: %s\n", pci_name(pvt->F3));

        return 0;
}

static void free_mc_sibling_devs(struct amd64_pvt *pvt)
{
        pci_dev_put(pvt->F1);
        pci_dev_put(pvt->F3);
}

/*
 * Retrieve the hardware registers of the memory controller (this includes the
 * 'Address Map' and 'Misc' device regs)
 */
static void read_mc_regs(struct amd64_pvt *pvt)
{
        struct cpuinfo_x86 *c = &boot_cpu_data;
        u64 msr_val;
        u32 tmp;
        unsigned range;

        /*
         * 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);
        edac_dbg(0, "  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);
                edac_dbg(0, "  TOP_MEM2: 0x%016llx\n", pvt->top_mem2);
        } else
                edac_dbg(0, "  TOP_MEM2 disabled\n");

        amd64_read_pci_cfg(pvt->F3, NBCAP, &pvt->nbcap);

        read_dram_ctl_register(pvt);

        for (range = 0; range < DRAM_RANGES; range++) {
                u8 rw;

                /* read settings for this DRAM range */
                read_dram_base_limit_regs(pvt, range);

                rw = dram_rw(pvt, range);
                if (!rw)
                        continue;

                edac_dbg(1, "  DRAM range[%d], base: 0x%016llx; limit: 0x%016llx\n",
                         range,
                         get_dram_base(pvt, range),
                         get_dram_limit(pvt, range));

                edac_dbg(1, "   IntlvEn=%s; Range access: %s%s IntlvSel=%d DstNode=%d\n",
                         dram_intlv_en(pvt, range) ? "Enabled" : "Disabled",
                         (rw & 0x1) ? "R" : "-",
                         (rw & 0x2) ? "W" : "-",
                         dram_intlv_sel(pvt, range),
                         dram_dst_node(pvt, range));
        }

        read_dct_base_mask(pvt);

        amd64_read_pci_cfg(pvt->F1, DHAR, &pvt->dhar);
        amd64_read_dct_pci_cfg(pvt, DBAM0, &pvt->dbam0);

        amd64_read_pci_cfg(pvt->F3, F10_ONLINE_SPARE, &pvt->online_spare);

        amd64_read_dct_pci_cfg(pvt, DCLR0, &pvt->dclr0);
        amd64_read_dct_pci_cfg(pvt, DCHR0, &pvt->dchr0);

        if (!dct_ganging_enabled(pvt)) {
                amd64_read_dct_pci_cfg(pvt, DCLR1, &pvt->dclr1);
                amd64_read_dct_pci_cfg(pvt, DCHR1, &pvt->dchr1);
        }

        pvt->ecc_sym_sz = 4;

        if (c->x86 >= 0x10) {
                amd64_read_pci_cfg(pvt->F3, EXT_NB_MCA_CFG, &tmp);
                amd64_read_dct_pci_cfg(pvt, DBAM1, &pvt->dbam1);

                /* F10h, revD and later can do x8 ECC too */
                if ((c->x86 > 0x10 || c->x86_model > 7) && tmp & BIT(25))
                        pvt->ecc_sym_sz = 8;
        }
        dump_misc_regs(pvt);
}

/*
 * NOTE: CPU Revision Dependent code
 *
 * Input:
 *      @csrow_nr ChipSelect Row Number (0..NUM_CHIPSELECTS-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(struct amd64_pvt *pvt, u8 dct, int csrow_nr)
{
        u32 cs_mode, nr_pages;
        u32 dbam = dct ? pvt->dbam1 : pvt->dbam0;


        /*
         * 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 = DBAM_DIMM(csrow_nr / 2, dbam);

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

        edac_dbg(0, "csrow: %d, channel: %d, DBAM idx: %d\n",
                    csrow_nr, dct,  cs_mode);
        edac_dbg(0, "nr_pages/channel: %u\n", nr_pages);

        return nr_pages;
}

/*
 * Initialize the array of csrow attribute instances, based on the values
 * from pci config hardware registers.
 */
static int init_csrows(struct mem_ctl_info *mci)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        struct csrow_info *csrow;
        struct dimm_info *dimm;
        enum edac_type edac_mode;
        enum mem_type mtype;
        int i, j, empty = 1;
        int nr_pages = 0;
        u32 val;

        amd64_read_pci_cfg(pvt->F3, NBCFG, &val);

        pvt->nbcfg = val;

        edac_dbg(0, "node %d, NBCFG=0x%08x[ChipKillEccCap: %d|DramEccEn: %d]\n",
                 pvt->mc_node_id, val,
                 !!(val & NBCFG_CHIPKILL), !!(val & NBCFG_ECC_ENABLE));

        /*
         * We iterate over DCT0 here but we look at DCT1 in parallel, if needed.
         */
        for_each_chip_select(i, 0, pvt) {
                bool row_dct0 = !!csrow_enabled(i, 0, pvt);
                bool row_dct1 = false;

                if (boot_cpu_data.x86 != 0xf)
                        row_dct1 = !!csrow_enabled(i, 1, pvt);

                if (!row_dct0 && !row_dct1)
                        continue;

                csrow = mci->csrows[i];
                empty = 0;

                edac_dbg(1, "MC node: %d, csrow: %d\n",
                            pvt->mc_node_id, i);

                if (row_dct0)
                        nr_pages = amd64_csrow_nr_pages(pvt, 0, i);

                /* K8 has only one DCT */
                if (boot_cpu_data.x86 != 0xf && row_dct1)
                        nr_pages += amd64_csrow_nr_pages(pvt, 1, i);

                mtype = amd64_determine_memory_type(pvt, i);

                edac_dbg(1, "Total csrow%d pages: %u\n", i, nr_pages);

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

                for (j = 0; j < pvt->channel_count; j++) {
                        dimm = csrow->channels[j]->dimm;
                        dimm->mtype = mtype;
                        dimm->edac_mode = edac_mode;
                        dimm->nr_pages = nr_pages;
                }
                csrow->nr_pages = nr_pages;
        }

        return empty;
}

/* get all cores on this DCT */
static void get_cpus_on_this_dct_cpumask(struct cpumask *mask, unsigned 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(unsigned nid)
{
        cpumask_var_t mask;
        int cpu, nbe;
        bool ret = false;

        if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
                amd64_warn("%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 & MSR_MCGCTL_NBE;

                edac_dbg(0, "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 toggle_ecc_err_reporting(struct ecc_settings *s, u8 nid, bool on)
{
        cpumask_var_t cmask;
        int cpu;

        if (!zalloc_cpumask_var(&cmask, GFP_KERNEL)) {
                amd64_warn("%s: error allocating mask\n", __func__);
                return false;
        }

        get_cpus_on_this_dct_cpumask(cmask, nid);

        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 & MSR_MCGCTL_NBE)
                                s->flags.nb_mce_enable = 1;

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

        free_cpumask_var(cmask);

        return 0;
}

static bool enable_ecc_error_reporting(struct ecc_settings *s, u8 nid,
                                       struct pci_dev *F3)
{
        bool ret = true;
        u32 value, mask = 0x3;          /* UECC/CECC enable */

        if (toggle_ecc_err_reporting(s, nid, ON)) {
                amd64_warn("Error enabling ECC reporting over MCGCTL!\n");
                return false;
        }

        amd64_read_pci_cfg(F3, NBCTL, &value);

        s->old_nbctl   = value & mask;
        s->nbctl_valid = true;

        value |= mask;
        amd64_write_pci_cfg(F3, NBCTL, value);

        amd64_read_pci_cfg(F3, NBCFG, &value);

        edac_dbg(0, "1: node %d, NBCFG=0x%08x[DramEccEn: %d]\n",
                 nid, value, !!(value & NBCFG_ECC_ENABLE));

        if (!(value & NBCFG_ECC_ENABLE)) {
                amd64_warn("DRAM ECC disabled on this node, enabling...\n");

                s->flags.nb_ecc_prev = 0;

                /* Attempt to turn on DRAM ECC Enable */
                value |= NBCFG_ECC_ENABLE;
                amd64_write_pci_cfg(F3, NBCFG, value);

                amd64_read_pci_cfg(F3, NBCFG, &value);

                if (!(value & NBCFG_ECC_ENABLE)) {
                        amd64_warn("Hardware rejected DRAM ECC enable,"
                                   "check memory DIMM configuration.\n");
                        ret = false;
                } else {
                        amd64_info("Hardware accepted DRAM ECC Enable\n");
                }
        } else {
                s->flags.nb_ecc_prev = 1;
        }

        edac_dbg(0, "2: node %d, NBCFG=0x%08x[DramEccEn: %d]\n",
                 nid, value, !!(value & NBCFG_ECC_ENABLE));

        return ret;
}

static void restore_ecc_error_reporting(struct ecc_settings *s, u8 nid,
                                        struct pci_dev *F3)
{
        u32 value, mask = 0x3;          /* UECC/CECC enable */


        if (!s->nbctl_valid)
                return;

        amd64_read_pci_cfg(F3, NBCTL, &value);
        value &= ~mask;
        value |= s->old_nbctl;

        amd64_write_pci_cfg(F3, NBCTL, value);

        /* restore previous BIOS DRAM ECC "off" setting we force-enabled */
        if (!s->flags.nb_ecc_prev) {
                amd64_read_pci_cfg(F3, NBCFG, &value);
                value &= ~NBCFG_ECC_ENABLE;
                amd64_write_pci_cfg(F3, NBCFG, value);
        }

        /* restore the NB Enable MCGCTL bit */
        if (toggle_ecc_err_reporting(s, nid, OFF))
                amd64_warn("Error restoring NB MCGCTL settings!\n");
}

/*
 * EDAC requires that the BIOS have ECC enabled before
 * taking over the processing of ECC errors. A command line
 * option allows to force-enable hardware ECC later in
 * 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 bool ecc_enabled(struct pci_dev *F3, u8 nid)
{
        u32 value;
        u8 ecc_en = 0;
        bool nb_mce_en = false;

        amd64_read_pci_cfg(F3, NBCFG, &value);

        ecc_en = !!(value & NBCFG_ECC_ENABLE);
        amd64_info("DRAM ECC %s.\n", (ecc_en ? "enabled" : "disabled"));

        nb_mce_en = amd64_nb_mce_bank_enabled_on_node(nid);
        if (!nb_mce_en)
                amd64_notice("NB MCE bank disabled, set MSR "
                             "0x%08x[4] on node %d to enable.\n",
                             MSR_IA32_MCG_CTL, nid);

        if (!ecc_en || !nb_mce_en) {
                amd64_notice("%s", ecc_msg);
                return false;
        }
        return true;
}

static int set_mc_sysfs_attrs(struct mem_ctl_info *mci)
{
        int rc;

        rc = amd64_create_sysfs_dbg_files(mci);
        if (rc < 0)
                return rc;

        if (boot_cpu_data.x86 >= 0x10) {
                rc = amd64_create_sysfs_inject_files(mci);
                if (rc < 0)
                        return rc;
        }

        return 0;
}

static void del_mc_sysfs_attrs(struct mem_ctl_info *mci)
{
        amd64_remove_sysfs_dbg_files(mci);

        if (boot_cpu_data.x86 >= 0x10)
                amd64_remove_sysfs_inject_files(mci);
}

static void setup_mci_misc_attrs(struct mem_ctl_info *mci,
                                 struct amd64_family_type *fam)
{
        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 & NBCAP_SECDED)
                mci->edac_ctl_cap |= EDAC_FLAG_SECDED;

        if (pvt->nbcap & 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           = fam->ctl_name;
        mci->dev_name           = pci_name(pvt->F2);
        mci->ctl_page_to_phys   = NULL;

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

/*
 * returns a pointer to the family descriptor on success, NULL otherwise.
 */
static struct amd64_family_type *amd64_per_family_init(struct amd64_pvt *pvt)
{
        u8 fam = boot_cpu_data.x86;
        struct amd64_family_type *fam_type = NULL;

        switch (fam) {
        case 0xf:
                fam_type                = &amd64_family_types[K8_CPUS];
                pvt->ops                = &amd64_family_types[K8_CPUS].ops;
                break;

        case 0x10:
                fam_type                = &amd64_family_types[F10_CPUS];
                pvt->ops                = &amd64_family_types[F10_CPUS].ops;
                break;

        case 0x15:
                fam_type                = &amd64_family_types[F15_CPUS];
                pvt->ops                = &amd64_family_types[F15_CPUS].ops;
                break;

        default:
                amd64_err("Unsupported family!\n");
                return NULL;
        }

        pvt->ext_model = boot_cpu_data.x86_model >> 4;

        amd64_info("%s %sdetected (node %d).\n", fam_type->ctl_name,
                     (fam == 0xf ?
                                (pvt->ext_model >= K8_REV_F  ? "revF or later "
                                                             : "revE or earlier ")
                                 : ""), pvt->mc_node_id);
        return fam_type;
}

static int amd64_init_one_instance(struct pci_dev *F2)
{
        struct amd64_pvt *pvt = NULL;
        struct amd64_family_type *fam_type = NULL;
        struct mem_ctl_info *mci = NULL;
        struct edac_mc_layer layers[2];
        int err = 0, ret;
        u8 nid = get_node_id(F2);

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

        pvt->mc_node_id = nid;
        pvt->F2 = F2;

        ret = -EINVAL;
        fam_type = amd64_per_family_init(pvt);
        if (!fam_type)
                goto err_free;

        ret = -ENODEV;
        err = reserve_mc_sibling_devs(pvt, fam_type->f1_id, fam_type->f3_id);
        if (err)
                goto err_free;

        read_mc_regs(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.
         */
        ret = -EINVAL;
        pvt->channel_count = pvt->ops->early_channel_count(pvt);
        if (pvt->channel_count < 0)
                goto err_siblings;

        ret = -ENOMEM;
        layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
        layers[0].size = pvt->csels[0].b_cnt;
        layers[0].is_virt_csrow = true;
        layers[1].type = EDAC_MC_LAYER_CHANNEL;
        layers[1].size = pvt->channel_count;
        layers[1].is_virt_csrow = false;
        mci = edac_mc_alloc(nid, ARRAY_SIZE(layers), layers, 0);
        if (!mci)
                goto err_siblings;

        mci->pvt_info = pvt;
        mci->pdev = &pvt->F2->dev;
        mci->csbased = 1;

        setup_mci_misc_attrs(mci, fam_type);

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

        ret = -ENODEV;
        if (edac_mc_add_mc(mci)) {
                edac_dbg(1, "failed edac_mc_add_mc()\n");
                goto err_add_mc;
        }
        if (set_mc_sysfs_attrs(mci)) {
                edac_dbg(1, "failed edac_mc_add_mc()\n");
                goto err_add_sysfs;
        }

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

        amd_register_ecc_decoder(amd64_decode_bus_error);

        mcis[nid] = mci;

        atomic_inc(&drv_instances);

        return 0;

err_add_sysfs:
        edac_mc_del_mc(mci->pdev);
err_add_mc:
        edac_mc_free(mci);

err_siblings:
        free_mc_sibling_devs(pvt);

err_free:
        kfree(pvt);

err_ret:
        return ret;
}

static int amd64_probe_one_instance(struct pci_dev *pdev,
                                    const struct pci_device_id *mc_type)
{
        u8 nid = get_node_id(pdev);
        struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
        struct ecc_settings *s;
        int ret = 0;

        ret = pci_enable_device(pdev);
        if (ret < 0) {
                edac_dbg(0, "ret=%d\n", ret);
                return -EIO;
        }

        ret = -ENOMEM;
        s = kzalloc(sizeof(struct ecc_settings), GFP_KERNEL);
        if (!s)
                goto err_out;

        ecc_stngs[nid] = s;

        if (!ecc_enabled(F3, nid)) {
                ret = -ENODEV;

                if (!ecc_enable_override)
                        goto err_enable;

                amd64_warn("Forcing ECC on!\n");

                if (!enable_ecc_error_reporting(s, nid, F3))
                        goto err_enable;
        }

        ret = amd64_init_one_instance(pdev);
        if (ret < 0) {
                amd64_err("Error probing instance: %d\n", nid);
                restore_ecc_error_reporting(s, nid, F3);
        }

        return ret;

err_enable:
        kfree(s);
        ecc_stngs[nid] = NULL;

err_out:
        return ret;
}

static void amd64_remove_one_instance(struct pci_dev *pdev)
{
        struct mem_ctl_info *mci;
        struct amd64_pvt *pvt;
        u8 nid = get_node_id(pdev);
        struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
        struct ecc_settings *s = ecc_stngs[nid];

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

        pvt = mci->pvt_info;

        restore_ecc_error_reporting(s, nid, F3);

        free_mc_sibling_devs(pvt);

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

        kfree(ecc_stngs[nid]);
        ecc_stngs[nid] = NULL;

        /* Free the EDAC CORE resources */
        mci->pvt_info = NULL;
        mcis[nid] = 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 DEFINE_PCI_DEVICE_TABLE(amd64_pci_table) = {
        {
                .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,
        },
        {
                .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,
        },
        {
                .vendor         = PCI_VENDOR_ID_AMD,
                .device         = PCI_DEVICE_ID_AMD_15H_NB_F2,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
                .class          = 0,
                .class_mask     = 0,
        },

        {0, }
};
MODULE_DEVICE_TABLE(pci, amd64_pci_table);

static struct pci_driver amd64_pci_driver = {
        .name           = EDAC_MOD_STR,
        .probe          = amd64_probe_one_instance,
        .remove         = amd64_remove_one_instance,
        .id_table       = amd64_pci_table,
};

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

        if (amd64_ctl_pci)
                return;

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

                pvt = mci->pvt_info;
                amd64_ctl_pci =
                        edac_pci_create_generic_ctl(&pvt->F2->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 err = -ENODEV;

        printk(KERN_INFO "AMD64 EDAC driver v%s\n", EDAC_AMD64_VERSION);

        opstate_init();

        if (amd_cache_northbridges() < 0)
                goto err_ret;

        err = -ENOMEM;
        mcis      = kzalloc(amd_nb_num() * sizeof(mcis[0]), GFP_KERNEL);
        ecc_stngs = kzalloc(amd_nb_num() * sizeof(ecc_stngs[0]), GFP_KERNEL);
        if (!(mcis && ecc_stngs))
                goto err_free;

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

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

        err = -ENODEV;
        if (!atomic_read(&drv_instances))
                goto err_no_instances;

        setup_pci_device();
        return 0;

err_no_instances:
        pci_unregister_driver(&amd64_pci_driver);

err_pci:
        msrs_free(msrs);
        msrs = NULL;

err_free:
        kfree(mcis);
        mcis = NULL;

        kfree(ecc_stngs);
        ecc_stngs = 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);

        kfree(ecc_stngs);
        ecc_stngs = NULL;

        kfree(mcis);
        mcis = NULL;

        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");