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linux_old1/drivers/edac/skx_base.c

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// SPDX-License-Identifier: GPL-2.0
/*
* EDAC driver for Intel(R) Xeon(R) Skylake processors
* Copyright (c) 2016, Intel Corporation.
*/
#include <linux/kernel.h>
#include <linux/processor.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/mce.h>
#include "edac_module.h"
#include "skx_common.h"
#define EDAC_MOD_STR "skx_edac"
/*
* Debug macros
*/
#define skx_printk(level, fmt, arg...) \
edac_printk(level, "skx", fmt, ##arg)
#define skx_mc_printk(mci, level, fmt, arg...) \
edac_mc_chipset_printk(mci, level, "skx", fmt, ##arg)
static struct list_head *skx_edac_list;
static u64 skx_tolm, skx_tohm;
static int skx_num_sockets;
static unsigned int nvdimm_count;
#define MASK26 0x3FFFFFF /* Mask for 2^26 */
#define MASK29 0x1FFFFFFF /* Mask for 2^29 */
static struct skx_dev *get_skx_dev(struct pci_bus *bus, u8 idx)
{
struct skx_dev *d;
list_for_each_entry(d, skx_edac_list, list) {
if (d->seg == pci_domain_nr(bus) && d->bus[idx] == bus->number)
return d;
}
return NULL;
}
enum munittype {
CHAN0, CHAN1, CHAN2, SAD_ALL, UTIL_ALL, SAD
};
struct munit {
u16 did;
u16 devfn[SKX_NUM_IMC];
u8 busidx;
u8 per_socket;
enum munittype mtype;
};
/*
* List of PCI device ids that we need together with some device
* number and function numbers to tell which memory controller the
* device belongs to.
*/
static const struct munit skx_all_munits[] = {
{ 0x2054, { }, 1, 1, SAD_ALL },
{ 0x2055, { }, 1, 1, UTIL_ALL },
{ 0x2040, { PCI_DEVFN(10, 0), PCI_DEVFN(12, 0) }, 2, 2, CHAN0 },
{ 0x2044, { PCI_DEVFN(10, 4), PCI_DEVFN(12, 4) }, 2, 2, CHAN1 },
{ 0x2048, { PCI_DEVFN(11, 0), PCI_DEVFN(13, 0) }, 2, 2, CHAN2 },
{ 0x208e, { }, 1, 0, SAD },
{ }
};
static int get_all_munits(const struct munit *m)
{
struct pci_dev *pdev, *prev;
struct skx_dev *d;
u32 reg;
int i = 0, ndev = 0;
prev = NULL;
for (;;) {
pdev = pci_get_device(PCI_VENDOR_ID_INTEL, m->did, prev);
if (!pdev)
break;
ndev++;
if (m->per_socket == SKX_NUM_IMC) {
for (i = 0; i < SKX_NUM_IMC; i++)
if (m->devfn[i] == pdev->devfn)
break;
if (i == SKX_NUM_IMC)
goto fail;
}
d = get_skx_dev(pdev->bus, m->busidx);
if (!d)
goto fail;
/* Be sure that the device is enabled */
if (unlikely(pci_enable_device(pdev) < 0)) {
skx_printk(KERN_ERR, "Couldn't enable device %04x:%04x\n",
PCI_VENDOR_ID_INTEL, m->did);
goto fail;
}
switch (m->mtype) {
case CHAN0: case CHAN1: case CHAN2:
pci_dev_get(pdev);
d->imc[i].chan[m->mtype].cdev = pdev;
break;
case SAD_ALL:
pci_dev_get(pdev);
d->sad_all = pdev;
break;
case UTIL_ALL:
pci_dev_get(pdev);
d->util_all = pdev;
break;
case SAD:
/*
* one of these devices per core, including cores
* that don't exist on this SKU. Ignore any that
* read a route table of zero, make sure all the
* non-zero values match.
*/
pci_read_config_dword(pdev, 0xB4, &reg);
if (reg != 0) {
if (d->mcroute == 0) {
d->mcroute = reg;
} else if (d->mcroute != reg) {
skx_printk(KERN_ERR, "mcroute mismatch\n");
goto fail;
}
}
ndev--;
break;
}
prev = pdev;
}
return ndev;
fail:
pci_dev_put(pdev);
return -ENODEV;
}
static const struct x86_cpu_id skx_cpuids[] = {
{ X86_VENDOR_INTEL, 6, INTEL_FAM6_SKYLAKE_X, 0, 0 },
{ }
};
MODULE_DEVICE_TABLE(x86cpu, skx_cpuids);
#define SKX_GET_MTMTR(dev, reg) \
pci_read_config_dword((dev), 0x87c, &(reg))
static bool skx_check_ecc(struct pci_dev *pdev)
{
u32 mtmtr;
SKX_GET_MTMTR(pdev, mtmtr);
return !!GET_BITFIELD(mtmtr, 2, 2);
}
static int skx_get_dimm_config(struct mem_ctl_info *mci)
{
struct skx_pvt *pvt = mci->pvt_info;
struct skx_imc *imc = pvt->imc;
u32 mtr, amap, mcddrtcfg;
struct dimm_info *dimm;
int i, j;
int ndimms;
for (i = 0; i < SKX_NUM_CHANNELS; i++) {
ndimms = 0;
pci_read_config_dword(imc->chan[i].cdev, 0x8C, &amap);
pci_read_config_dword(imc->chan[i].cdev, 0x400, &mcddrtcfg);
for (j = 0; j < SKX_NUM_DIMMS; j++) {
dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
mci->n_layers, i, j, 0);
pci_read_config_dword(imc->chan[i].cdev,
0x80 + 4 * j, &mtr);
if (IS_DIMM_PRESENT(mtr)) {
ndimms += skx_get_dimm_info(mtr, amap, dimm, imc, i, j);
} else if (IS_NVDIMM_PRESENT(mcddrtcfg, j)) {
ndimms += skx_get_nvdimm_info(dimm, imc, i, j,
EDAC_MOD_STR);
nvdimm_count++;
}
}
if (ndimms && !skx_check_ecc(imc->chan[0].cdev)) {
skx_printk(KERN_ERR, "ECC is disabled on imc %d\n", imc->mc);
return -ENODEV;
}
}
return 0;
}
#define SKX_MAX_SAD 24
#define SKX_GET_SAD(d, i, reg) \
pci_read_config_dword((d)->sad_all, 0x60 + 8 * (i), &(reg))
#define SKX_GET_ILV(d, i, reg) \
pci_read_config_dword((d)->sad_all, 0x64 + 8 * (i), &(reg))
#define SKX_SAD_MOD3MODE(sad) GET_BITFIELD((sad), 30, 31)
#define SKX_SAD_MOD3(sad) GET_BITFIELD((sad), 27, 27)
#define SKX_SAD_LIMIT(sad) (((u64)GET_BITFIELD((sad), 7, 26) << 26) | MASK26)
#define SKX_SAD_MOD3ASMOD2(sad) GET_BITFIELD((sad), 5, 6)
#define SKX_SAD_ATTR(sad) GET_BITFIELD((sad), 3, 4)
#define SKX_SAD_INTERLEAVE(sad) GET_BITFIELD((sad), 1, 2)
#define SKX_SAD_ENABLE(sad) GET_BITFIELD((sad), 0, 0)
#define SKX_ILV_REMOTE(tgt) (((tgt) & 8) == 0)
#define SKX_ILV_TARGET(tgt) ((tgt) & 7)
static bool skx_sad_decode(struct decoded_addr *res)
{
struct skx_dev *d = list_first_entry(skx_edac_list, typeof(*d), list);
u64 addr = res->addr;
int i, idx, tgt, lchan, shift;
u32 sad, ilv;
u64 limit, prev_limit;
int remote = 0;
/* Simple sanity check for I/O space or out of range */
if (addr >= skx_tohm || (addr >= skx_tolm && addr < BIT_ULL(32))) {
edac_dbg(0, "Address 0x%llx out of range\n", addr);
return false;
}
restart:
prev_limit = 0;
for (i = 0; i < SKX_MAX_SAD; i++) {
SKX_GET_SAD(d, i, sad);
limit = SKX_SAD_LIMIT(sad);
if (SKX_SAD_ENABLE(sad)) {
if (addr >= prev_limit && addr <= limit)
goto sad_found;
}
prev_limit = limit + 1;
}
edac_dbg(0, "No SAD entry for 0x%llx\n", addr);
return false;
sad_found:
SKX_GET_ILV(d, i, ilv);
switch (SKX_SAD_INTERLEAVE(sad)) {
case 0:
idx = GET_BITFIELD(addr, 6, 8);
break;
case 1:
idx = GET_BITFIELD(addr, 8, 10);
break;
case 2:
idx = GET_BITFIELD(addr, 12, 14);
break;
case 3:
idx = GET_BITFIELD(addr, 30, 32);
break;
}
tgt = GET_BITFIELD(ilv, 4 * idx, 4 * idx + 3);
/* If point to another node, find it and start over */
if (SKX_ILV_REMOTE(tgt)) {
if (remote) {
edac_dbg(0, "Double remote!\n");
return false;
}
remote = 1;
list_for_each_entry(d, skx_edac_list, list) {
if (d->imc[0].src_id == SKX_ILV_TARGET(tgt))
goto restart;
}
edac_dbg(0, "Can't find node %d\n", SKX_ILV_TARGET(tgt));
return false;
}
if (SKX_SAD_MOD3(sad) == 0) {
lchan = SKX_ILV_TARGET(tgt);
} else {
switch (SKX_SAD_MOD3MODE(sad)) {
case 0:
shift = 6;
break;
case 1:
shift = 8;
break;
case 2:
shift = 12;
break;
default:
edac_dbg(0, "illegal mod3mode\n");
return false;
}
switch (SKX_SAD_MOD3ASMOD2(sad)) {
case 0:
lchan = (addr >> shift) % 3;
break;
case 1:
lchan = (addr >> shift) % 2;
break;
case 2:
lchan = (addr >> shift) % 2;
lchan = (lchan << 1) | !lchan;
break;
case 3:
lchan = ((addr >> shift) % 2) << 1;
break;
}
lchan = (lchan << 1) | (SKX_ILV_TARGET(tgt) & 1);
}
res->dev = d;
res->socket = d->imc[0].src_id;
res->imc = GET_BITFIELD(d->mcroute, lchan * 3, lchan * 3 + 2);
res->channel = GET_BITFIELD(d->mcroute, lchan * 2 + 18, lchan * 2 + 19);
edac_dbg(2, "0x%llx: socket=%d imc=%d channel=%d\n",
res->addr, res->socket, res->imc, res->channel);
return true;
}
#define SKX_MAX_TAD 8
#define SKX_GET_TADBASE(d, mc, i, reg) \
pci_read_config_dword((d)->imc[mc].chan[0].cdev, 0x850 + 4 * (i), &(reg))
#define SKX_GET_TADWAYNESS(d, mc, i, reg) \
pci_read_config_dword((d)->imc[mc].chan[0].cdev, 0x880 + 4 * (i), &(reg))
#define SKX_GET_TADCHNILVOFFSET(d, mc, ch, i, reg) \
pci_read_config_dword((d)->imc[mc].chan[ch].cdev, 0x90 + 4 * (i), &(reg))
#define SKX_TAD_BASE(b) ((u64)GET_BITFIELD((b), 12, 31) << 26)
#define SKX_TAD_SKT_GRAN(b) GET_BITFIELD((b), 4, 5)
#define SKX_TAD_CHN_GRAN(b) GET_BITFIELD((b), 6, 7)
#define SKX_TAD_LIMIT(b) (((u64)GET_BITFIELD((b), 12, 31) << 26) | MASK26)
#define SKX_TAD_OFFSET(b) ((u64)GET_BITFIELD((b), 4, 23) << 26)
#define SKX_TAD_SKTWAYS(b) (1 << GET_BITFIELD((b), 10, 11))
#define SKX_TAD_CHNWAYS(b) (GET_BITFIELD((b), 8, 9) + 1)
/* which bit used for both socket and channel interleave */
static int skx_granularity[] = { 6, 8, 12, 30 };
static u64 skx_do_interleave(u64 addr, int shift, int ways, u64 lowbits)
{
addr >>= shift;
addr /= ways;
addr <<= shift;
return addr | (lowbits & ((1ull << shift) - 1));
}
static bool skx_tad_decode(struct decoded_addr *res)
{
int i;
u32 base, wayness, chnilvoffset;
int skt_interleave_bit, chn_interleave_bit;
u64 channel_addr;
for (i = 0; i < SKX_MAX_TAD; i++) {
SKX_GET_TADBASE(res->dev, res->imc, i, base);
SKX_GET_TADWAYNESS(res->dev, res->imc, i, wayness);
if (SKX_TAD_BASE(base) <= res->addr && res->addr <= SKX_TAD_LIMIT(wayness))
goto tad_found;
}
edac_dbg(0, "No TAD entry for 0x%llx\n", res->addr);
return false;
tad_found:
res->sktways = SKX_TAD_SKTWAYS(wayness);
res->chanways = SKX_TAD_CHNWAYS(wayness);
skt_interleave_bit = skx_granularity[SKX_TAD_SKT_GRAN(base)];
chn_interleave_bit = skx_granularity[SKX_TAD_CHN_GRAN(base)];
SKX_GET_TADCHNILVOFFSET(res->dev, res->imc, res->channel, i, chnilvoffset);
channel_addr = res->addr - SKX_TAD_OFFSET(chnilvoffset);
if (res->chanways == 3 && skt_interleave_bit > chn_interleave_bit) {
/* Must handle channel first, then socket */
channel_addr = skx_do_interleave(channel_addr, chn_interleave_bit,
res->chanways, channel_addr);
channel_addr = skx_do_interleave(channel_addr, skt_interleave_bit,
res->sktways, channel_addr);
} else {
/* Handle socket then channel. Preserve low bits from original address */
channel_addr = skx_do_interleave(channel_addr, skt_interleave_bit,
res->sktways, res->addr);
channel_addr = skx_do_interleave(channel_addr, chn_interleave_bit,
res->chanways, res->addr);
}
res->chan_addr = channel_addr;
edac_dbg(2, "0x%llx: chan_addr=0x%llx sktways=%d chanways=%d\n",
res->addr, res->chan_addr, res->sktways, res->chanways);
return true;
}
#define SKX_MAX_RIR 4
#define SKX_GET_RIRWAYNESS(d, mc, ch, i, reg) \
pci_read_config_dword((d)->imc[mc].chan[ch].cdev, \
0x108 + 4 * (i), &(reg))
#define SKX_GET_RIRILV(d, mc, ch, idx, i, reg) \
pci_read_config_dword((d)->imc[mc].chan[ch].cdev, \
0x120 + 16 * (idx) + 4 * (i), &(reg))
#define SKX_RIR_VALID(b) GET_BITFIELD((b), 31, 31)
#define SKX_RIR_LIMIT(b) (((u64)GET_BITFIELD((b), 1, 11) << 29) | MASK29)
#define SKX_RIR_WAYS(b) (1 << GET_BITFIELD((b), 28, 29))
#define SKX_RIR_CHAN_RANK(b) GET_BITFIELD((b), 16, 19)
#define SKX_RIR_OFFSET(b) ((u64)(GET_BITFIELD((b), 2, 15) << 26))
static bool skx_rir_decode(struct decoded_addr *res)
{
int i, idx, chan_rank;
int shift;
u32 rirway, rirlv;
u64 rank_addr, prev_limit = 0, limit;
if (res->dev->imc[res->imc].chan[res->channel].dimms[0].close_pg)
shift = 6;
else
shift = 13;
for (i = 0; i < SKX_MAX_RIR; i++) {
SKX_GET_RIRWAYNESS(res->dev, res->imc, res->channel, i, rirway);
limit = SKX_RIR_LIMIT(rirway);
if (SKX_RIR_VALID(rirway)) {
if (prev_limit <= res->chan_addr &&
res->chan_addr <= limit)
goto rir_found;
}
prev_limit = limit;
}
edac_dbg(0, "No RIR entry for 0x%llx\n", res->addr);
return false;
rir_found:
rank_addr = res->chan_addr >> shift;
rank_addr /= SKX_RIR_WAYS(rirway);
rank_addr <<= shift;
rank_addr |= res->chan_addr & GENMASK_ULL(shift - 1, 0);
res->rank_address = rank_addr;
idx = (res->chan_addr >> shift) % SKX_RIR_WAYS(rirway);
SKX_GET_RIRILV(res->dev, res->imc, res->channel, idx, i, rirlv);
res->rank_address = rank_addr - SKX_RIR_OFFSET(rirlv);
chan_rank = SKX_RIR_CHAN_RANK(rirlv);
res->channel_rank = chan_rank;
res->dimm = chan_rank / 4;
res->rank = chan_rank % 4;
edac_dbg(2, "0x%llx: dimm=%d rank=%d chan_rank=%d rank_addr=0x%llx\n",
res->addr, res->dimm, res->rank,
res->channel_rank, res->rank_address);
return true;
}
static u8 skx_close_row[] = {
15, 16, 17, 18, 20, 21, 22, 28, 10, 11, 12, 13, 29, 30, 31, 32, 33
};
static u8 skx_close_column[] = {
3, 4, 5, 14, 19, 23, 24, 25, 26, 27
};
static u8 skx_open_row[] = {
14, 15, 16, 20, 28, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33
};
static u8 skx_open_column[] = {
3, 4, 5, 6, 7, 8, 9, 10, 11, 12
};
static u8 skx_open_fine_column[] = {
3, 4, 5, 7, 8, 9, 10, 11, 12, 13
};
static int skx_bits(u64 addr, int nbits, u8 *bits)
{
int i, res = 0;
for (i = 0; i < nbits; i++)
res |= ((addr >> bits[i]) & 1) << i;
return res;
}
static int skx_bank_bits(u64 addr, int b0, int b1, int do_xor, int x0, int x1)
{
int ret = GET_BITFIELD(addr, b0, b0) | (GET_BITFIELD(addr, b1, b1) << 1);
if (do_xor)
ret ^= GET_BITFIELD(addr, x0, x0) | (GET_BITFIELD(addr, x1, x1) << 1);
return ret;
}
static bool skx_mad_decode(struct decoded_addr *r)
{
struct skx_dimm *dimm = &r->dev->imc[r->imc].chan[r->channel].dimms[r->dimm];
int bg0 = dimm->fine_grain_bank ? 6 : 13;
if (dimm->close_pg) {
r->row = skx_bits(r->rank_address, dimm->rowbits, skx_close_row);
r->column = skx_bits(r->rank_address, dimm->colbits, skx_close_column);
r->column |= 0x400; /* C10 is autoprecharge, always set */
r->bank_address = skx_bank_bits(r->rank_address, 8, 9, dimm->bank_xor_enable, 22, 28);
r->bank_group = skx_bank_bits(r->rank_address, 6, 7, dimm->bank_xor_enable, 20, 21);
} else {
r->row = skx_bits(r->rank_address, dimm->rowbits, skx_open_row);
if (dimm->fine_grain_bank)
r->column = skx_bits(r->rank_address, dimm->colbits, skx_open_fine_column);
else
r->column = skx_bits(r->rank_address, dimm->colbits, skx_open_column);
r->bank_address = skx_bank_bits(r->rank_address, 18, 19, dimm->bank_xor_enable, 22, 23);
r->bank_group = skx_bank_bits(r->rank_address, bg0, 17, dimm->bank_xor_enable, 20, 21);
}
r->row &= (1u << dimm->rowbits) - 1;
edac_dbg(2, "0x%llx: row=0x%x col=0x%x bank_addr=%d bank_group=%d\n",
r->addr, r->row, r->column, r->bank_address,
r->bank_group);
return true;
}
static bool skx_decode(struct decoded_addr *res)
{
return skx_sad_decode(res) && skx_tad_decode(res) &&
skx_rir_decode(res) && skx_mad_decode(res);
}
static struct notifier_block skx_mce_dec = {
.notifier_call = skx_mce_check_error,
.priority = MCE_PRIO_EDAC,
};
#ifdef CONFIG_EDAC_DEBUG
/*
* Debug feature.
* Exercise the address decode logic by writing an address to
* /sys/kernel/debug/edac/skx_test/addr.
*/
static struct dentry *skx_test;
static int debugfs_u64_set(void *data, u64 val)
{
struct mce m;
pr_warn_once("Fake error to 0x%llx injected via debugfs\n", val);
memset(&m, 0, sizeof(m));
/* ADDRV + MemRd + Unknown channel */
m.status = MCI_STATUS_ADDRV + 0x90;
/* One corrected error */
m.status |= BIT_ULL(MCI_STATUS_CEC_SHIFT);
m.addr = val;
skx_mce_check_error(NULL, 0, &m);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n");
static void setup_skx_debug(void)
{
skx_test = edac_debugfs_create_dir("skx_test");
if (!skx_test)
return;
if (!edac_debugfs_create_file("addr", 0200, skx_test,
NULL, &fops_u64_wo)) {
debugfs_remove(skx_test);
skx_test = NULL;
}
}
static void teardown_skx_debug(void)
{
debugfs_remove_recursive(skx_test);
}
#else
static inline void setup_skx_debug(void) {}
static inline void teardown_skx_debug(void) {}
#endif /*CONFIG_EDAC_DEBUG*/
/*
* skx_init:
* make sure we are running on the correct cpu model
* search for all the devices we need
* check which DIMMs are present.
*/
static int __init skx_init(void)
{
const struct x86_cpu_id *id;
const struct munit *m;
const char *owner;
int rc = 0, i, off[3] = {0xd0, 0xd4, 0xd8};
u8 mc = 0, src_id, node_id;
struct skx_dev *d;
edac_dbg(2, "\n");
owner = edac_get_owner();
if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
return -EBUSY;
id = x86_match_cpu(skx_cpuids);
if (!id)
return -ENODEV;
rc = skx_get_hi_lo(0x2034, off, &skx_tolm, &skx_tohm);
if (rc)
return rc;
rc = skx_get_all_bus_mappings(0x2016, 0xcc, SKX, &skx_edac_list);
if (rc < 0)
goto fail;
if (rc == 0) {
edac_dbg(2, "No memory controllers found\n");
return -ENODEV;
}
skx_num_sockets = rc;
for (m = skx_all_munits; m->did; m++) {
rc = get_all_munits(m);
if (rc < 0)
goto fail;
if (rc != m->per_socket * skx_num_sockets) {
edac_dbg(2, "Expected %d, got %d of 0x%x\n",
m->per_socket * skx_num_sockets, rc, m->did);
rc = -ENODEV;
goto fail;
}
}
list_for_each_entry(d, skx_edac_list, list) {
rc = skx_get_src_id(d, &src_id);
if (rc < 0)
goto fail;
rc = skx_get_node_id(d, &node_id);
if (rc < 0)
goto fail;
edac_dbg(2, "src_id=%d node_id=%d\n", src_id, node_id);
for (i = 0; i < SKX_NUM_IMC; i++) {
d->imc[i].mc = mc++;
d->imc[i].lmc = i;
d->imc[i].src_id = src_id;
d->imc[i].node_id = node_id;
rc = skx_register_mci(&d->imc[i], d->imc[i].chan[0].cdev,
"Skylake Socket", EDAC_MOD_STR,
skx_get_dimm_config);
if (rc < 0)
goto fail;
}
}
skx_set_decode(skx_decode);
if (nvdimm_count && skx_adxl_get() == -ENODEV)
skx_printk(KERN_NOTICE, "Only decoding DDR4 address!\n");
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
setup_skx_debug();
mce_register_decode_chain(&skx_mce_dec);
return 0;
fail:
skx_remove();
return rc;
}
static void __exit skx_exit(void)
{
edac_dbg(2, "\n");
mce_unregister_decode_chain(&skx_mce_dec);
teardown_skx_debug();
if (nvdimm_count)
skx_adxl_put();
skx_remove();
}
module_init(skx_init);
module_exit(skx_exit);
module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Tony Luck");
MODULE_DESCRIPTION("MC Driver for Intel Skylake server processors");
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