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linux/drivers/edac/sb_edac.c
Mauro Carvalho Chehab deb09ddaff sb_edac: Avoid overflow errors at memory size calculation 
Sandy bridge EDAC is calculating the memory size with overflow.
Basically, the size field and the integer calculation is using 32 bits.
More bits are needed, when the DIMM memories have high density.

The net result is that memories are improperly reported there, when
high-density DIMMs are used:

EDAC DEBUG: in drivers/edac/sb_edac.c, line at 591: mc#0: channel 0, dimm 0, -16384 Mb (-4194304 pages) bank: 8, rank: 2, row: 0x10000, col: 0x800
EDAC DEBUG: in drivers/edac/sb_edac.c, line at 591: mc#0: channel 1, dimm 0, -16384 Mb (-4194304 pages) bank: 8, rank: 2, row: 0x10000, col: 0x800

As the number of pages value is handled at the EDAC core as unsigned
ints, the driver shows the 16 GB memories at sysfs interface as 16760832
MB! The fix is simple: calculate the number of pages as unsigned 64-bits
integer.

After the patch, the memory size (16 GB) is properly detected:

EDAC DEBUG: in drivers/edac/sb_edac.c, line at 592: mc#0: channel 0, dimm 0, 16384 Mb (4194304 pages) bank: 8, rank: 2, row: 0x10000, col: 0x800
EDAC DEBUG: in drivers/edac/sb_edac.c, line at 592: mc#0: channel 1, dimm 0, 16384 Mb (4194304 pages) bank: 8, rank: 2, row: 0x10000, col: 0x800

Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-09-25 07:38:20 -03:00

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/* Intel Sandy Bridge -EN/-EP/-EX Memory Controller kernel module
*
* This driver supports the memory controllers found on the Intel
* processor family Sandy Bridge.
*
* This file may be distributed under the terms of the
* GNU General Public License version 2 only.
*
* Copyright (c) 2011 by:
* Mauro Carvalho Chehab <mchehab@redhat.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/edac.h>
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <linux/bitmap.h>
#include <linux/math64.h>
#include <asm/processor.h>
#include <asm/mce.h>
#include "edac_core.h"
/* Static vars */
static LIST_HEAD(sbridge_edac_list);
static DEFINE_MUTEX(sbridge_edac_lock);
static int probed;
/*
* Alter this version for the module when modifications are made
*/
#define SBRIDGE_REVISION " Ver: 1.0.0 "
#define EDAC_MOD_STR "sbridge_edac"
/*
* Debug macros
*/
#define sbridge_printk(level, fmt, arg...) \
edac_printk(level, "sbridge", fmt, ##arg)
#define sbridge_mc_printk(mci, level, fmt, arg...) \
edac_mc_chipset_printk(mci, level, "sbridge", fmt, ##arg)
/*
* Get a bit field at register value <v>, from bit <lo> to bit <hi>
*/
#define GET_BITFIELD(v, lo, hi) \
(((v) & ((1ULL << ((hi) - (lo) + 1)) - 1) << (lo)) >> (lo))
/*
* sbridge Memory Controller Registers
*/
/*
* FIXME: For now, let's order by device function, as it makes
* easier for driver's development process. This table should be
* moved to pci_id.h when submitted upstream
*/
#define PCI_DEVICE_ID_INTEL_SBRIDGE_SAD0 0x3cf4 /* 12.6 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_SAD1 0x3cf6 /* 12.7 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_BR 0x3cf5 /* 13.6 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0 0x3ca0 /* 14.0 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA 0x3ca8 /* 15.0 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_RAS 0x3c71 /* 15.1 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0 0x3caa /* 15.2 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD1 0x3cab /* 15.3 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD2 0x3cac /* 15.4 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD3 0x3cad /* 15.5 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO 0x3cb8 /* 17.0 */
/*
* Currently, unused, but will be needed in the future
* implementations, as they hold the error counters
*/
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_ERR0 0x3c72 /* 16.2 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_ERR1 0x3c73 /* 16.3 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_ERR2 0x3c76 /* 16.6 */
#define PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_ERR3 0x3c77 /* 16.7 */
/* Devices 12 Function 6, Offsets 0x80 to 0xcc */
static const u32 dram_rule[] = {
0x80, 0x88, 0x90, 0x98, 0xa0,
0xa8, 0xb0, 0xb8, 0xc0, 0xc8,
};
#define MAX_SAD ARRAY_SIZE(dram_rule)
#define SAD_LIMIT(reg) ((GET_BITFIELD(reg, 6, 25) << 26) | 0x3ffffff)
#define DRAM_ATTR(reg) GET_BITFIELD(reg, 2, 3)
#define INTERLEAVE_MODE(reg) GET_BITFIELD(reg, 1, 1)
#define DRAM_RULE_ENABLE(reg) GET_BITFIELD(reg, 0, 0)
static char *get_dram_attr(u32 reg)
{
switch(DRAM_ATTR(reg)) {
case 0:
return "DRAM";
case 1:
return "MMCFG";
case 2:
return "NXM";
default:
return "unknown";
}
}
static const u32 interleave_list[] = {
0x84, 0x8c, 0x94, 0x9c, 0xa4,
0xac, 0xb4, 0xbc, 0xc4, 0xcc,
};
#define MAX_INTERLEAVE ARRAY_SIZE(interleave_list)
#define SAD_PKG0(reg) GET_BITFIELD(reg, 0, 2)
#define SAD_PKG1(reg) GET_BITFIELD(reg, 3, 5)
#define SAD_PKG2(reg) GET_BITFIELD(reg, 8, 10)
#define SAD_PKG3(reg) GET_BITFIELD(reg, 11, 13)
#define SAD_PKG4(reg) GET_BITFIELD(reg, 16, 18)
#define SAD_PKG5(reg) GET_BITFIELD(reg, 19, 21)
#define SAD_PKG6(reg) GET_BITFIELD(reg, 24, 26)
#define SAD_PKG7(reg) GET_BITFIELD(reg, 27, 29)
static inline int sad_pkg(u32 reg, int interleave)
{
switch (interleave) {
case 0:
return SAD_PKG0(reg);
case 1:
return SAD_PKG1(reg);
case 2:
return SAD_PKG2(reg);
case 3:
return SAD_PKG3(reg);
case 4:
return SAD_PKG4(reg);
case 5:
return SAD_PKG5(reg);
case 6:
return SAD_PKG6(reg);
case 7:
return SAD_PKG7(reg);
default:
return -EINVAL;
}
}
/* Devices 12 Function 7 */
#define TOLM 0x80
#define TOHM 0x84
#define GET_TOLM(reg) ((GET_BITFIELD(reg, 0, 3) << 28) | 0x3ffffff)
#define GET_TOHM(reg) ((GET_BITFIELD(reg, 0, 20) << 25) | 0x3ffffff)
/* Device 13 Function 6 */
#define SAD_TARGET 0xf0
#define SOURCE_ID(reg) GET_BITFIELD(reg, 9, 11)
#define SAD_CONTROL 0xf4
#define NODE_ID(reg) GET_BITFIELD(reg, 0, 2)
/* Device 14 function 0 */
static const u32 tad_dram_rule[] = {
0x40, 0x44, 0x48, 0x4c,
0x50, 0x54, 0x58, 0x5c,
0x60, 0x64, 0x68, 0x6c,
};
#define MAX_TAD ARRAY_SIZE(tad_dram_rule)
#define TAD_LIMIT(reg) ((GET_BITFIELD(reg, 12, 31) << 26) | 0x3ffffff)
#define TAD_SOCK(reg) GET_BITFIELD(reg, 10, 11)
#define TAD_CH(reg) GET_BITFIELD(reg, 8, 9)
#define TAD_TGT3(reg) GET_BITFIELD(reg, 6, 7)
#define TAD_TGT2(reg) GET_BITFIELD(reg, 4, 5)
#define TAD_TGT1(reg) GET_BITFIELD(reg, 2, 3)
#define TAD_TGT0(reg) GET_BITFIELD(reg, 0, 1)
/* Device 15, function 0 */
#define MCMTR 0x7c
#define IS_ECC_ENABLED(mcmtr) GET_BITFIELD(mcmtr, 2, 2)
#define IS_LOCKSTEP_ENABLED(mcmtr) GET_BITFIELD(mcmtr, 1, 1)
#define IS_CLOSE_PG(mcmtr) GET_BITFIELD(mcmtr, 0, 0)
/* Device 15, function 1 */
#define RASENABLES 0xac
#define IS_MIRROR_ENABLED(reg) GET_BITFIELD(reg, 0, 0)
/* Device 15, functions 2-5 */
static const int mtr_regs[] = {
0x80, 0x84, 0x88,
};
#define RANK_DISABLE(mtr) GET_BITFIELD(mtr, 16, 19)
#define IS_DIMM_PRESENT(mtr) GET_BITFIELD(mtr, 14, 14)
#define RANK_CNT_BITS(mtr) GET_BITFIELD(mtr, 12, 13)
#define RANK_WIDTH_BITS(mtr) GET_BITFIELD(mtr, 2, 4)
#define COL_WIDTH_BITS(mtr) GET_BITFIELD(mtr, 0, 1)
static const u32 tad_ch_nilv_offset[] = {
0x90, 0x94, 0x98, 0x9c,
0xa0, 0xa4, 0xa8, 0xac,
0xb0, 0xb4, 0xb8, 0xbc,
};
#define CHN_IDX_OFFSET(reg) GET_BITFIELD(reg, 28, 29)
#define TAD_OFFSET(reg) (GET_BITFIELD(reg, 6, 25) << 26)
static const u32 rir_way_limit[] = {
0x108, 0x10c, 0x110, 0x114, 0x118,
};
#define MAX_RIR_RANGES ARRAY_SIZE(rir_way_limit)
#define IS_RIR_VALID(reg) GET_BITFIELD(reg, 31, 31)
#define RIR_WAY(reg) GET_BITFIELD(reg, 28, 29)
#define RIR_LIMIT(reg) ((GET_BITFIELD(reg, 1, 10) << 29)| 0x1fffffff)
#define MAX_RIR_WAY 8
static const u32 rir_offset[MAX_RIR_RANGES][MAX_RIR_WAY] = {
{ 0x120, 0x124, 0x128, 0x12c, 0x130, 0x134, 0x138, 0x13c },
{ 0x140, 0x144, 0x148, 0x14c, 0x150, 0x154, 0x158, 0x15c },
{ 0x160, 0x164, 0x168, 0x16c, 0x170, 0x174, 0x178, 0x17c },
{ 0x180, 0x184, 0x188, 0x18c, 0x190, 0x194, 0x198, 0x19c },
{ 0x1a0, 0x1a4, 0x1a8, 0x1ac, 0x1b0, 0x1b4, 0x1b8, 0x1bc },
};
#define RIR_RNK_TGT(reg) GET_BITFIELD(reg, 16, 19)
#define RIR_OFFSET(reg) GET_BITFIELD(reg, 2, 14)
/* Device 16, functions 2-7 */
/*
* FIXME: Implement the error count reads directly
*/
static const u32 correrrcnt[] = {
0x104, 0x108, 0x10c, 0x110,
};
#define RANK_ODD_OV(reg) GET_BITFIELD(reg, 31, 31)
#define RANK_ODD_ERR_CNT(reg) GET_BITFIELD(reg, 16, 30)
#define RANK_EVEN_OV(reg) GET_BITFIELD(reg, 15, 15)
#define RANK_EVEN_ERR_CNT(reg) GET_BITFIELD(reg, 0, 14)
static const u32 correrrthrsld[] = {
0x11c, 0x120, 0x124, 0x128,
};
#define RANK_ODD_ERR_THRSLD(reg) GET_BITFIELD(reg, 16, 30)
#define RANK_EVEN_ERR_THRSLD(reg) GET_BITFIELD(reg, 0, 14)
/* Device 17, function 0 */
#define RANK_CFG_A 0x0328
#define IS_RDIMM_ENABLED(reg) GET_BITFIELD(reg, 11, 11)
/*
* sbridge structs
*/
#define NUM_CHANNELS 4
#define MAX_DIMMS 3 /* Max DIMMS per channel */
struct sbridge_info {
u32 mcmtr;
};
struct sbridge_channel {
u32 ranks;
u32 dimms;
};
struct pci_id_descr {
int dev;
int func;
int dev_id;
int optional;
};
struct pci_id_table {
const struct pci_id_descr *descr;
int n_devs;
};
struct sbridge_dev {
struct list_head list;
u8 bus, mc;
u8 node_id, source_id;
struct pci_dev **pdev;
int n_devs;
struct mem_ctl_info *mci;
};
struct sbridge_pvt {
struct pci_dev *pci_ta, *pci_ddrio, *pci_ras;
struct pci_dev *pci_sad0, *pci_sad1, *pci_ha0;
struct pci_dev *pci_br;
struct pci_dev *pci_tad[NUM_CHANNELS];
struct sbridge_dev *sbridge_dev;
struct sbridge_info info;
struct sbridge_channel channel[NUM_CHANNELS];
/* Memory type detection */
bool is_mirrored, is_lockstep, is_close_pg;
/* Fifo double buffers */
struct mce mce_entry[MCE_LOG_LEN];
struct mce mce_outentry[MCE_LOG_LEN];
/* Fifo in/out counters */
unsigned mce_in, mce_out;
/* Count indicator to show errors not got */
unsigned mce_overrun;
/* Memory description */
u64 tolm, tohm;
};
#define PCI_DESCR(device, function, device_id) \
.dev = (device), \
.func = (function), \
.dev_id = (device_id)
static const struct pci_id_descr pci_dev_descr_sbridge[] = {
/* Processor Home Agent */
{ PCI_DESCR(14, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0) },
/* Memory controller */
{ PCI_DESCR(15, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA) },
{ PCI_DESCR(15, 1, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_RAS) },
{ PCI_DESCR(15, 2, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0) },
{ PCI_DESCR(15, 3, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD1) },
{ PCI_DESCR(15, 4, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD2) },
{ PCI_DESCR(15, 5, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD3) },
{ PCI_DESCR(17, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO) },
/* System Address Decoder */
{ PCI_DESCR(12, 6, PCI_DEVICE_ID_INTEL_SBRIDGE_SAD0) },
{ PCI_DESCR(12, 7, PCI_DEVICE_ID_INTEL_SBRIDGE_SAD1) },
/* Broadcast Registers */
{ PCI_DESCR(13, 6, PCI_DEVICE_ID_INTEL_SBRIDGE_BR) },
};
#define PCI_ID_TABLE_ENTRY(A) { .descr=A, .n_devs = ARRAY_SIZE(A) }
static const struct pci_id_table pci_dev_descr_sbridge_table[] = {
PCI_ID_TABLE_ENTRY(pci_dev_descr_sbridge),
{0,} /* 0 terminated list. */
};
/*
* pci_device_id table for which devices we are looking for
*/
static DEFINE_PCI_DEVICE_TABLE(sbridge_pci_tbl) = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA)},
{0,} /* 0 terminated list. */
};
/****************************************************************************
Ancillary status routines
****************************************************************************/
static inline int numrank(u32 mtr)
{
int ranks = (1 << RANK_CNT_BITS(mtr));
if (ranks > 4) {
edac_dbg(0, "Invalid number of ranks: %d (max = 4) raw value = %x (%04x)\n",
ranks, (unsigned int)RANK_CNT_BITS(mtr), mtr);
return -EINVAL;
}
return ranks;
}
static inline int numrow(u32 mtr)
{
int rows = (RANK_WIDTH_BITS(mtr) + 12);
if (rows < 13 || rows > 18) {
edac_dbg(0, "Invalid number of rows: %d (should be between 14 and 17) raw value = %x (%04x)\n",
rows, (unsigned int)RANK_WIDTH_BITS(mtr), mtr);
return -EINVAL;
}
return 1 << rows;
}
static inline int numcol(u32 mtr)
{
int cols = (COL_WIDTH_BITS(mtr) + 10);
if (cols > 12) {
edac_dbg(0, "Invalid number of cols: %d (max = 4) raw value = %x (%04x)\n",
cols, (unsigned int)COL_WIDTH_BITS(mtr), mtr);
return -EINVAL;
}
return 1 << cols;
}
static struct sbridge_dev *get_sbridge_dev(u8 bus)
{
struct sbridge_dev *sbridge_dev;
list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
if (sbridge_dev->bus == bus)
return sbridge_dev;
}
return NULL;
}
static struct sbridge_dev *alloc_sbridge_dev(u8 bus,
const struct pci_id_table *table)
{
struct sbridge_dev *sbridge_dev;
sbridge_dev = kzalloc(sizeof(*sbridge_dev), GFP_KERNEL);
if (!sbridge_dev)
return NULL;
sbridge_dev->pdev = kzalloc(sizeof(*sbridge_dev->pdev) * table->n_devs,
GFP_KERNEL);
if (!sbridge_dev->pdev) {
kfree(sbridge_dev);
return NULL;
}
sbridge_dev->bus = bus;
sbridge_dev->n_devs = table->n_devs;
list_add_tail(&sbridge_dev->list, &sbridge_edac_list);
return sbridge_dev;
}
static void free_sbridge_dev(struct sbridge_dev *sbridge_dev)
{
list_del(&sbridge_dev->list);
kfree(sbridge_dev->pdev);
kfree(sbridge_dev);
}
/****************************************************************************
Memory check routines
****************************************************************************/
static struct pci_dev *get_pdev_slot_func(u8 bus, unsigned slot,
unsigned func)
{
struct sbridge_dev *sbridge_dev = get_sbridge_dev(bus);
int i;
if (!sbridge_dev)
return NULL;
for (i = 0; i < sbridge_dev->n_devs; i++) {
if (!sbridge_dev->pdev[i])
continue;
if (PCI_SLOT(sbridge_dev->pdev[i]->devfn) == slot &&
PCI_FUNC(sbridge_dev->pdev[i]->devfn) == func) {
edac_dbg(1, "Associated %02x.%02x.%d with %p\n",
bus, slot, func, sbridge_dev->pdev[i]);
return sbridge_dev->pdev[i];
}
}
return NULL;
}
/**
* check_if_ecc_is_active() - Checks if ECC is active
* bus: Device bus
*/
static int check_if_ecc_is_active(const u8 bus)
{
struct pci_dev *pdev = NULL;
u32 mcmtr;
pdev = get_pdev_slot_func(bus, 15, 0);
if (!pdev) {
sbridge_printk(KERN_ERR, "Couldn't find PCI device "
"%2x.%02d.%d!!!\n",
bus, 15, 0);
return -ENODEV;
}
pci_read_config_dword(pdev, MCMTR, &mcmtr);
if (!IS_ECC_ENABLED(mcmtr)) {
sbridge_printk(KERN_ERR, "ECC is disabled. Aborting\n");
return -ENODEV;
}
return 0;
}
static int get_dimm_config(struct mem_ctl_info *mci)
{
struct sbridge_pvt *pvt = mci->pvt_info;
struct dimm_info *dimm;
unsigned i, j, banks, ranks, rows, cols, npages;
u64 size;
u32 reg;
enum edac_type mode;
enum mem_type mtype;
pci_read_config_dword(pvt->pci_br, SAD_TARGET, &reg);
pvt->sbridge_dev->source_id = SOURCE_ID(reg);
pci_read_config_dword(pvt->pci_br, SAD_CONTROL, &reg);
pvt->sbridge_dev->node_id = NODE_ID(reg);
edac_dbg(0, "mc#%d: Node ID: %d, source ID: %d\n",
pvt->sbridge_dev->mc,
pvt->sbridge_dev->node_id,
pvt->sbridge_dev->source_id);
pci_read_config_dword(pvt->pci_ras, RASENABLES, &reg);
if (IS_MIRROR_ENABLED(reg)) {
edac_dbg(0, "Memory mirror is enabled\n");
pvt->is_mirrored = true;
} else {
edac_dbg(0, "Memory mirror is disabled\n");
pvt->is_mirrored = false;
}
pci_read_config_dword(pvt->pci_ta, MCMTR, &pvt->info.mcmtr);
if (IS_LOCKSTEP_ENABLED(pvt->info.mcmtr)) {
edac_dbg(0, "Lockstep is enabled\n");
mode = EDAC_S8ECD8ED;
pvt->is_lockstep = true;
} else {
edac_dbg(0, "Lockstep is disabled\n");
mode = EDAC_S4ECD4ED;
pvt->is_lockstep = false;
}
if (IS_CLOSE_PG(pvt->info.mcmtr)) {
edac_dbg(0, "address map is on closed page mode\n");
pvt->is_close_pg = true;
} else {
edac_dbg(0, "address map is on open page mode\n");
pvt->is_close_pg = false;
}
pci_read_config_dword(pvt->pci_ddrio, RANK_CFG_A, &reg);
if (IS_RDIMM_ENABLED(reg)) {
/* FIXME: Can also be LRDIMM */
edac_dbg(0, "Memory is registered\n");
mtype = MEM_RDDR3;
} else {
edac_dbg(0, "Memory is unregistered\n");
mtype = MEM_DDR3;
}
/* On all supported DDR3 DIMM types, there are 8 banks available */
banks = 8;
for (i = 0; i < NUM_CHANNELS; i++) {
u32 mtr;
for (j = 0; j < ARRAY_SIZE(mtr_regs); j++) {
dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, mci->n_layers,
i, j, 0);
pci_read_config_dword(pvt->pci_tad[i],
mtr_regs[j], &mtr);
edac_dbg(4, "Channel #%d MTR%d = %x\n", i, j, mtr);
if (IS_DIMM_PRESENT(mtr)) {
pvt->channel[i].dimms++;
ranks = numrank(mtr);
rows = numrow(mtr);
cols = numcol(mtr);
/* DDR3 has 8 I/O banks */
size = ((u64)rows * cols * banks * ranks) >> (20 - 3);
npages = MiB_TO_PAGES(size);
edac_dbg(0, "mc#%d: channel %d, dimm %d, %Ld Mb (%d pages) bank: %d, rank: %d, row: %#x, col: %#x\n",
pvt->sbridge_dev->mc, i, j,
size, npages,
banks, ranks, rows, cols);
dimm->nr_pages = npages;
dimm->grain = 32;
dimm->dtype = (banks == 8) ? DEV_X8 : DEV_X4;
dimm->mtype = mtype;
dimm->edac_mode = mode;
snprintf(dimm->label, sizeof(dimm->label),
"CPU_SrcID#%u_Channel#%u_DIMM#%u",
pvt->sbridge_dev->source_id, i, j);
}
}
}
return 0;
}
static void get_memory_layout(const struct mem_ctl_info *mci)
{
struct sbridge_pvt *pvt = mci->pvt_info;
int i, j, k, n_sads, n_tads, sad_interl;
u32 reg;
u64 limit, prv = 0;
u64 tmp_mb;
u32 mb, kb;
u32 rir_way;
/*
* Step 1) Get TOLM/TOHM ranges
*/
/* Address range is 32:28 */
pci_read_config_dword(pvt->pci_sad1, TOLM,
&reg);
pvt->tolm = GET_TOLM(reg);
tmp_mb = (1 + pvt->tolm) >> 20;
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "TOLM: %u.%03u GB (0x%016Lx)\n", mb, kb, (u64)pvt->tolm);
/* Address range is already 45:25 */
pci_read_config_dword(pvt->pci_sad1, TOHM,
&reg);
pvt->tohm = GET_TOHM(reg);
tmp_mb = (1 + pvt->tohm) >> 20;
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "TOHM: %u.%03u GB (0x%016Lx)", mb, kb, (u64)pvt->tohm);
/*
* Step 2) Get SAD range and SAD Interleave list
* TAD registers contain the interleave wayness. However, it
* seems simpler to just discover it indirectly, with the
* algorithm bellow.
*/
prv = 0;
for (n_sads = 0; n_sads < MAX_SAD; n_sads++) {
/* SAD_LIMIT Address range is 45:26 */
pci_read_config_dword(pvt->pci_sad0, dram_rule[n_sads],
&reg);
limit = SAD_LIMIT(reg);
if (!DRAM_RULE_ENABLE(reg))
continue;
if (limit <= prv)
break;
tmp_mb = (limit + 1) >> 20;
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "SAD#%d %s up to %u.%03u GB (0x%016Lx) Interleave: %s reg=0x%08x\n",
n_sads,
get_dram_attr(reg),
mb, kb,
((u64)tmp_mb) << 20L,
INTERLEAVE_MODE(reg) ? "8:6" : "[8:6]XOR[18:16]",
reg);
prv = limit;
pci_read_config_dword(pvt->pci_sad0, interleave_list[n_sads],
&reg);
sad_interl = sad_pkg(reg, 0);
for (j = 0; j < 8; j++) {
if (j > 0 && sad_interl == sad_pkg(reg, j))
break;
edac_dbg(0, "SAD#%d, interleave #%d: %d\n",
n_sads, j, sad_pkg(reg, j));
}
}
/*
* Step 3) Get TAD range
*/
prv = 0;
for (n_tads = 0; n_tads < MAX_TAD; n_tads++) {
pci_read_config_dword(pvt->pci_ha0, tad_dram_rule[n_tads],
&reg);
limit = TAD_LIMIT(reg);
if (limit <= prv)
break;
tmp_mb = (limit + 1) >> 20;
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "TAD#%d: up to %u.%03u GB (0x%016Lx), socket interleave %d, memory interleave %d, TGT: %d, %d, %d, %d, reg=0x%08x\n",
n_tads, mb, kb,
((u64)tmp_mb) << 20L,
(u32)TAD_SOCK(reg),
(u32)TAD_CH(reg),
(u32)TAD_TGT0(reg),
(u32)TAD_TGT1(reg),
(u32)TAD_TGT2(reg),
(u32)TAD_TGT3(reg),
reg);
prv = limit;
}
/*
* Step 4) Get TAD offsets, per each channel
*/
for (i = 0; i < NUM_CHANNELS; i++) {
if (!pvt->channel[i].dimms)
continue;
for (j = 0; j < n_tads; j++) {
pci_read_config_dword(pvt->pci_tad[i],
tad_ch_nilv_offset[j],
&reg);
tmp_mb = TAD_OFFSET(reg) >> 20;
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "TAD CH#%d, offset #%d: %u.%03u GB (0x%016Lx), reg=0x%08x\n",
i, j,
mb, kb,
((u64)tmp_mb) << 20L,
reg);
}
}
/*
* Step 6) Get RIR Wayness/Limit, per each channel
*/
for (i = 0; i < NUM_CHANNELS; i++) {
if (!pvt->channel[i].dimms)
continue;
for (j = 0; j < MAX_RIR_RANGES; j++) {
pci_read_config_dword(pvt->pci_tad[i],
rir_way_limit[j],
&reg);
if (!IS_RIR_VALID(reg))
continue;
tmp_mb = RIR_LIMIT(reg) >> 20;
rir_way = 1 << RIR_WAY(reg);
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "CH#%d RIR#%d, limit: %u.%03u GB (0x%016Lx), way: %d, reg=0x%08x\n",
i, j,
mb, kb,
((u64)tmp_mb) << 20L,
rir_way,
reg);
for (k = 0; k < rir_way; k++) {
pci_read_config_dword(pvt->pci_tad[i],
rir_offset[j][k],
&reg);
tmp_mb = RIR_OFFSET(reg) << 6;
mb = div_u64_rem(tmp_mb, 1000, &kb);
edac_dbg(0, "CH#%d RIR#%d INTL#%d, offset %u.%03u GB (0x%016Lx), tgt: %d, reg=0x%08x\n",
i, j, k,
mb, kb,
((u64)tmp_mb) << 20L,
(u32)RIR_RNK_TGT(reg),
reg);
}
}
}
}
struct mem_ctl_info *get_mci_for_node_id(u8 node_id)
{
struct sbridge_dev *sbridge_dev;
list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
if (sbridge_dev->node_id == node_id)
return sbridge_dev->mci;
}
return NULL;
}
static int get_memory_error_data(struct mem_ctl_info *mci,
u64 addr,
u8 *socket,
long *channel_mask,
u8 *rank,
char **area_type, char *msg)
{
struct mem_ctl_info *new_mci;
struct sbridge_pvt *pvt = mci->pvt_info;
int n_rir, n_sads, n_tads, sad_way, sck_xch;
int sad_interl, idx, base_ch;
int interleave_mode;
unsigned sad_interleave[MAX_INTERLEAVE];
u32 reg;
u8 ch_way,sck_way;
u32 tad_offset;
u32 rir_way;
u32 mb, kb;
u64 ch_addr, offset, limit, prv = 0;
/*
* Step 0) Check if the address is at special memory ranges
* The check bellow is probably enough to fill all cases where
* the error is not inside a memory, except for the legacy
* range (e. g. VGA addresses). It is unlikely, however, that the
* memory controller would generate an error on that range.
*/
if ((addr > (u64) pvt->tolm) && (addr < (1LL << 32))) {
sprintf(msg, "Error at TOLM area, on addr 0x%08Lx", addr);
return -EINVAL;
}
if (addr >= (u64)pvt->tohm) {
sprintf(msg, "Error at MMIOH area, on addr 0x%016Lx", addr);
return -EINVAL;
}
/*
* Step 1) Get socket
*/
for (n_sads = 0; n_sads < MAX_SAD; n_sads++) {
pci_read_config_dword(pvt->pci_sad0, dram_rule[n_sads],
&reg);
if (!DRAM_RULE_ENABLE(reg))
continue;
limit = SAD_LIMIT(reg);
if (limit <= prv) {
sprintf(msg, "Can't discover the memory socket");
return -EINVAL;
}
if (addr <= limit)
break;
prv = limit;
}
if (n_sads == MAX_SAD) {
sprintf(msg, "Can't discover the memory socket");
return -EINVAL;
}
*area_type = get_dram_attr(reg);
interleave_mode = INTERLEAVE_MODE(reg);
pci_read_config_dword(pvt->pci_sad0, interleave_list[n_sads],
&reg);
sad_interl = sad_pkg(reg, 0);
for (sad_way = 0; sad_way < 8; sad_way++) {
if (sad_way > 0 && sad_interl == sad_pkg(reg, sad_way))
break;
sad_interleave[sad_way] = sad_pkg(reg, sad_way);
edac_dbg(0, "SAD interleave #%d: %d\n",
sad_way, sad_interleave[sad_way]);
}
edac_dbg(0, "mc#%d: Error detected on SAD#%d: address 0x%016Lx < 0x%016Lx, Interleave [%d:6]%s\n",
pvt->sbridge_dev->mc,
n_sads,
addr,
limit,
sad_way + 7,
interleave_mode ? "" : "XOR[18:16]");
if (interleave_mode)
idx = ((addr >> 6) ^ (addr >> 16)) & 7;
else
idx = (addr >> 6) & 7;
switch (sad_way) {
case 1:
idx = 0;
break;
case 2:
idx = idx & 1;
break;
case 4:
idx = idx & 3;
break;
case 8:
break;
default:
sprintf(msg, "Can't discover socket interleave");
return -EINVAL;
}
*socket = sad_interleave[idx];
edac_dbg(0, "SAD interleave index: %d (wayness %d) = CPU socket %d\n",
idx, sad_way, *socket);
/*
* Move to the proper node structure, in order to access the
* right PCI registers
*/
new_mci = get_mci_for_node_id(*socket);
if (!new_mci) {
sprintf(msg, "Struct for socket #%u wasn't initialized",
*socket);
return -EINVAL;
}
mci = new_mci;
pvt = mci->pvt_info;
/*
* Step 2) Get memory channel
*/
prv = 0;
for (n_tads = 0; n_tads < MAX_TAD; n_tads++) {
pci_read_config_dword(pvt->pci_ha0, tad_dram_rule[n_tads],
&reg);
limit = TAD_LIMIT(reg);
if (limit <= prv) {
sprintf(msg, "Can't discover the memory channel");
return -EINVAL;
}
if (addr <= limit)
break;
prv = limit;
}
ch_way = TAD_CH(reg) + 1;
sck_way = TAD_SOCK(reg) + 1;
/*
* FIXME: Is it right to always use channel 0 for offsets?
*/
pci_read_config_dword(pvt->pci_tad[0],
tad_ch_nilv_offset[n_tads],
&tad_offset);
if (ch_way == 3)
idx = addr >> 6;
else
idx = addr >> (6 + sck_way);
idx = idx % ch_way;
/*
* FIXME: Shouldn't we use CHN_IDX_OFFSET() here, when ch_way == 3 ???
*/
switch (idx) {
case 0:
base_ch = TAD_TGT0(reg);
break;
case 1:
base_ch = TAD_TGT1(reg);
break;
case 2:
base_ch = TAD_TGT2(reg);
break;
case 3:
base_ch = TAD_TGT3(reg);
break;
default:
sprintf(msg, "Can't discover the TAD target");
return -EINVAL;
}
*channel_mask = 1 << base_ch;
if (pvt->is_mirrored) {
*channel_mask |= 1 << ((base_ch + 2) % 4);
switch(ch_way) {
case 2:
case 4:
sck_xch = 1 << sck_way * (ch_way >> 1);
break;
default:
sprintf(msg, "Invalid mirror set. Can't decode addr");
return -EINVAL;
}
} else
sck_xch = (1 << sck_way) * ch_way;
if (pvt->is_lockstep)
*channel_mask |= 1 << ((base_ch + 1) % 4);
offset = TAD_OFFSET(tad_offset);
edac_dbg(0, "TAD#%d: address 0x%016Lx < 0x%016Lx, socket interleave %d, channel interleave %d (offset 0x%08Lx), index %d, base ch: %d, ch mask: 0x%02lx\n",
n_tads,
addr,
limit,
(u32)TAD_SOCK(reg),
ch_way,
offset,
idx,
base_ch,
*channel_mask);
/* Calculate channel address */
/* Remove the TAD offset */
if (offset > addr) {
sprintf(msg, "Can't calculate ch addr: TAD offset 0x%08Lx is too high for addr 0x%08Lx!",
offset, addr);
return -EINVAL;
}
addr -= offset;
/* Store the low bits [0:6] of the addr */
ch_addr = addr & 0x7f;
/* Remove socket wayness and remove 6 bits */
addr >>= 6;
addr = div_u64(addr, sck_xch);
#if 0
/* Divide by channel way */
addr = addr / ch_way;
#endif
/* Recover the last 6 bits */
ch_addr |= addr << 6;
/*
* Step 3) Decode rank
*/
for (n_rir = 0; n_rir < MAX_RIR_RANGES; n_rir++) {
pci_read_config_dword(pvt->pci_tad[base_ch],
rir_way_limit[n_rir],
&reg);
if (!IS_RIR_VALID(reg))
continue;
limit = RIR_LIMIT(reg);
mb = div_u64_rem(limit >> 20, 1000, &kb);
edac_dbg(0, "RIR#%d, limit: %u.%03u GB (0x%016Lx), way: %d\n",
n_rir,
mb, kb,
limit,
1 << RIR_WAY(reg));
if (ch_addr <= limit)
break;
}
if (n_rir == MAX_RIR_RANGES) {
sprintf(msg, "Can't discover the memory rank for ch addr 0x%08Lx",
ch_addr);
return -EINVAL;
}
rir_way = RIR_WAY(reg);
if (pvt->is_close_pg)
idx = (ch_addr >> 6);
else
idx = (ch_addr >> 13); /* FIXME: Datasheet says to shift by 15 */
idx %= 1 << rir_way;
pci_read_config_dword(pvt->pci_tad[base_ch],
rir_offset[n_rir][idx],
&reg);
*rank = RIR_RNK_TGT(reg);
edac_dbg(0, "RIR#%d: channel address 0x%08Lx < 0x%08Lx, RIR interleave %d, index %d\n",
n_rir,
ch_addr,
limit,
rir_way,
idx);
return 0;
}
/****************************************************************************
Device initialization routines: put/get, init/exit
****************************************************************************/
/*
* sbridge_put_all_devices 'put' all the devices that we have
* reserved via 'get'
*/
static void sbridge_put_devices(struct sbridge_dev *sbridge_dev)
{
int i;
edac_dbg(0, "\n");
for (i = 0; i < sbridge_dev->n_devs; i++) {
struct pci_dev *pdev = sbridge_dev->pdev[i];
if (!pdev)
continue;
edac_dbg(0, "Removing dev %02x:%02x.%d\n",
pdev->bus->number,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
pci_dev_put(pdev);
}
}
static void sbridge_put_all_devices(void)
{
struct sbridge_dev *sbridge_dev, *tmp;
list_for_each_entry_safe(sbridge_dev, tmp, &sbridge_edac_list, list) {
sbridge_put_devices(sbridge_dev);
free_sbridge_dev(sbridge_dev);
}
}
/*
* sbridge_get_all_devices Find and perform 'get' operation on the MCH's
* device/functions we want to reference for this driver
*
* Need to 'get' device 16 func 1 and func 2
*/
static int sbridge_get_onedevice(struct pci_dev **prev,
u8 *num_mc,
const struct pci_id_table *table,
const unsigned devno)
{
struct sbridge_dev *sbridge_dev;
const struct pci_id_descr *dev_descr = &table->descr[devno];
struct pci_dev *pdev = NULL;
u8 bus = 0;
sbridge_printk(KERN_INFO,
"Seeking for: dev %02x.%d PCI ID %04x:%04x\n",
dev_descr->dev, dev_descr->func,
PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
dev_descr->dev_id, *prev);
if (!pdev) {
if (*prev) {
*prev = pdev;
return 0;
}
if (dev_descr->optional)
return 0;
if (devno == 0)
return -ENODEV;
sbridge_printk(KERN_INFO,
"Device not found: dev %02x.%d PCI ID %04x:%04x\n",
dev_descr->dev, dev_descr->func,
PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
/* End of list, leave */
return -ENODEV;
}
bus = pdev->bus->number;
sbridge_dev = get_sbridge_dev(bus);
if (!sbridge_dev) {
sbridge_dev = alloc_sbridge_dev(bus, table);
if (!sbridge_dev) {
pci_dev_put(pdev);
return -ENOMEM;
}
(*num_mc)++;
}
if (sbridge_dev->pdev[devno]) {
sbridge_printk(KERN_ERR,
"Duplicated device for "
"dev %02x:%d.%d PCI ID %04x:%04x\n",
bus, dev_descr->dev, dev_descr->func,
PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
pci_dev_put(pdev);
return -ENODEV;
}
sbridge_dev->pdev[devno] = pdev;
/* Sanity check */
if (unlikely(PCI_SLOT(pdev->devfn) != dev_descr->dev ||
PCI_FUNC(pdev->devfn) != dev_descr->func)) {
sbridge_printk(KERN_ERR,
"Device PCI ID %04x:%04x "
"has dev %02x:%d.%d instead of dev %02x:%02x.%d\n",
PCI_VENDOR_ID_INTEL, dev_descr->dev_id,
bus, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
bus, dev_descr->dev, dev_descr->func);
return -ENODEV;
}
/* Be sure that the device is enabled */
if (unlikely(pci_enable_device(pdev) < 0)) {
sbridge_printk(KERN_ERR,
"Couldn't enable "
"dev %02x:%d.%d PCI ID %04x:%04x\n",
bus, dev_descr->dev, dev_descr->func,
PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
return -ENODEV;
}
edac_dbg(0, "Detected dev %02x:%d.%d PCI ID %04x:%04x\n",
bus, dev_descr->dev, dev_descr->func,
PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
/*
* As stated on drivers/pci/search.c, the reference count for
* @from is always decremented if it is not %NULL. So, as we need
* to get all devices up to null, we need to do a get for the device
*/
pci_dev_get(pdev);
*prev = pdev;
return 0;
}
static int sbridge_get_all_devices(u8 *num_mc)
{
int i, rc;
struct pci_dev *pdev = NULL;
const struct pci_id_table *table = pci_dev_descr_sbridge_table;
while (table && table->descr) {
for (i = 0; i < table->n_devs; i++) {
pdev = NULL;
do {
rc = sbridge_get_onedevice(&pdev, num_mc,
table, i);
if (rc < 0) {
if (i == 0) {
i = table->n_devs;
break;
}
sbridge_put_all_devices();
return -ENODEV;
}
} while (pdev);
}
table++;
}
return 0;
}
static int mci_bind_devs(struct mem_ctl_info *mci,
struct sbridge_dev *sbridge_dev)
{
struct sbridge_pvt *pvt = mci->pvt_info;
struct pci_dev *pdev;
int i, func, slot;
for (i = 0; i < sbridge_dev->n_devs; i++) {
pdev = sbridge_dev->pdev[i];
if (!pdev)
continue;
slot = PCI_SLOT(pdev->devfn);
func = PCI_FUNC(pdev->devfn);
switch (slot) {
case 12:
switch (func) {
case 6:
pvt->pci_sad0 = pdev;
break;
case 7:
pvt->pci_sad1 = pdev;
break;
default:
goto error;
}
break;
case 13:
switch (func) {
case 6:
pvt->pci_br = pdev;
break;
default:
goto error;
}
break;
case 14:
switch (func) {
case 0:
pvt->pci_ha0 = pdev;
break;
default:
goto error;
}
break;
case 15:
switch (func) {
case 0:
pvt->pci_ta = pdev;
break;
case 1:
pvt->pci_ras = pdev;
break;
case 2:
case 3:
case 4:
case 5:
pvt->pci_tad[func - 2] = pdev;
break;
default:
goto error;
}
break;
case 17:
switch (func) {
case 0:
pvt->pci_ddrio = pdev;
break;
default:
goto error;
}
break;
default:
goto error;
}
edac_dbg(0, "Associated PCI %02x.%02d.%d with dev = %p\n",
sbridge_dev->bus,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
pdev);
}
/* Check if everything were registered */
if (!pvt->pci_sad0 || !pvt->pci_sad1 || !pvt->pci_ha0 ||
!pvt-> pci_tad || !pvt->pci_ras || !pvt->pci_ta ||
!pvt->pci_ddrio)
goto enodev;
for (i = 0; i < NUM_CHANNELS; i++) {
if (!pvt->pci_tad[i])
goto enodev;
}
return 0;
enodev:
sbridge_printk(KERN_ERR, "Some needed devices are missing\n");
return -ENODEV;
error:
sbridge_printk(KERN_ERR, "Device %d, function %d "
"is out of the expected range\n",
slot, func);
return -EINVAL;
}
/****************************************************************************
Error check routines
****************************************************************************/
/*
* While Sandy Bridge has error count registers, SMI BIOS read values from
* and resets the counters. So, they are not reliable for the OS to read
* from them. So, we have no option but to just trust on whatever MCE is
* telling us about the errors.
*/
static void sbridge_mce_output_error(struct mem_ctl_info *mci,
const struct mce *m)
{
struct mem_ctl_info *new_mci;
struct sbridge_pvt *pvt = mci->pvt_info;
enum hw_event_mc_err_type tp_event;
char *type, *optype, msg[256];
bool ripv = GET_BITFIELD(m->mcgstatus, 0, 0);
bool overflow = GET_BITFIELD(m->status, 62, 62);
bool uncorrected_error = GET_BITFIELD(m->status, 61, 61);
bool recoverable = GET_BITFIELD(m->status, 56, 56);
u32 core_err_cnt = GET_BITFIELD(m->status, 38, 52);
u32 mscod = GET_BITFIELD(m->status, 16, 31);
u32 errcode = GET_BITFIELD(m->status, 0, 15);
u32 channel = GET_BITFIELD(m->status, 0, 3);
u32 optypenum = GET_BITFIELD(m->status, 4, 6);
long channel_mask, first_channel;
u8 rank, socket;
int rc, dimm;
char *area_type = NULL;
if (uncorrected_error) {
if (ripv) {
type = "FATAL";
tp_event = HW_EVENT_ERR_FATAL;
} else {
type = "NON_FATAL";
tp_event = HW_EVENT_ERR_UNCORRECTED;
}
} else {
type = "CORRECTED";
tp_event = HW_EVENT_ERR_CORRECTED;
}
/*
* According with Table 15-9 of the Intel Architecture spec vol 3A,
* memory errors should fit in this mask:
* 000f 0000 1mmm cccc (binary)
* where:
* f = Correction Report Filtering Bit. If 1, subsequent errors
* won't be shown
* mmm = error type
* cccc = channel
* If the mask doesn't match, report an error to the parsing logic
*/
if (! ((errcode & 0xef80) == 0x80)) {
optype = "Can't parse: it is not a mem";
} else {
switch (optypenum) {
case 0:
optype = "generic undef request error";
break;
case 1:
optype = "memory read error";
break;
case 2:
optype = "memory write error";
break;
case 3:
optype = "addr/cmd error";
break;
case 4:
optype = "memory scrubbing error";
break;
default:
optype = "reserved";
break;
}
}
rc = get_memory_error_data(mci, m->addr, &socket,
&channel_mask, &rank, &area_type, msg);
if (rc < 0)
goto err_parsing;
new_mci = get_mci_for_node_id(socket);
if (!new_mci) {
strcpy(msg, "Error: socket got corrupted!");
goto err_parsing;
}
mci = new_mci;
pvt = mci->pvt_info;
first_channel = find_first_bit(&channel_mask, NUM_CHANNELS);
if (rank < 4)
dimm = 0;
else if (rank < 8)
dimm = 1;
else
dimm = 2;
/*
* FIXME: On some memory configurations (mirror, lockstep), the
* Memory Controller can't point the error to a single DIMM. The
* EDAC core should be handling the channel mask, in order to point
* to the group of dimm's where the error may be happening.
*/
snprintf(msg, sizeof(msg),
"%s%s area:%s err_code:%04x:%04x socket:%d channel_mask:%ld rank:%d",
overflow ? " OVERFLOW" : "",
(uncorrected_error && recoverable) ? " recoverable" : "",
area_type,
mscod, errcode,
socket,
channel_mask,
rank);
edac_dbg(0, "%s\n", msg);
/* FIXME: need support for channel mask */
/* Call the helper to output message */
edac_mc_handle_error(tp_event, mci, core_err_cnt,
m->addr >> PAGE_SHIFT, m->addr & ~PAGE_MASK, 0,
channel, dimm, -1,
optype, msg);
return;
err_parsing:
edac_mc_handle_error(tp_event, mci, core_err_cnt, 0, 0, 0,
-1, -1, -1,
msg, "");
}
/*
* sbridge_check_error Retrieve and process errors reported by the
* hardware. Called by the Core module.
*/
static void sbridge_check_error(struct mem_ctl_info *mci)
{
struct sbridge_pvt *pvt = mci->pvt_info;
int i;
unsigned count = 0;
struct mce *m;
/*
* MCE first step: Copy all mce errors into a temporary buffer
* We use a double buffering here, to reduce the risk of
* loosing an error.
*/
smp_rmb();
count = (pvt->mce_out + MCE_LOG_LEN - pvt->mce_in)
% MCE_LOG_LEN;
if (!count)
return;
m = pvt->mce_outentry;
if (pvt->mce_in + count > MCE_LOG_LEN) {
unsigned l = MCE_LOG_LEN - pvt->mce_in;
memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * l);
smp_wmb();
pvt->mce_in = 0;
count -= l;
m += l;
}
memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * count);
smp_wmb();
pvt->mce_in += count;
smp_rmb();
if (pvt->mce_overrun) {
sbridge_printk(KERN_ERR, "Lost %d memory errors\n",
pvt->mce_overrun);
smp_wmb();
pvt->mce_overrun = 0;
}
/*
* MCE second step: parse errors and display
*/
for (i = 0; i < count; i++)
sbridge_mce_output_error(mci, &pvt->mce_outentry[i]);
}
/*
* sbridge_mce_check_error Replicates mcelog routine to get errors
* This routine simply queues mcelog errors, and
* return. The error itself should be handled later
* by sbridge_check_error.
* WARNING: As this routine should be called at NMI time, extra care should
* be taken to avoid deadlocks, and to be as fast as possible.
*/
static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
void *data)
{
struct mce *mce = (struct mce *)data;
struct mem_ctl_info *mci;
struct sbridge_pvt *pvt;
mci = get_mci_for_node_id(mce->socketid);
if (!mci)
return NOTIFY_BAD;
pvt = mci->pvt_info;
/*
* Just let mcelog handle it if the error is
* outside the memory controller. A memory error
* is indicated by bit 7 = 1 and bits = 8-11,13-15 = 0.
* bit 12 has an special meaning.
*/
if ((mce->status & 0xefff) >> 7 != 1)
return NOTIFY_DONE;
printk("sbridge: HANDLING MCE MEMORY ERROR\n");
printk("CPU %d: Machine Check Exception: %Lx Bank %d: %016Lx\n",
mce->extcpu, mce->mcgstatus, mce->bank, mce->status);
printk("TSC %llx ", mce->tsc);
printk("ADDR %llx ", mce->addr);
printk("MISC %llx ", mce->misc);
printk("PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n",
mce->cpuvendor, mce->cpuid, mce->time,
mce->socketid, mce->apicid);
/* Only handle if it is the right mc controller */
if (cpu_data(mce->cpu).phys_proc_id != pvt->sbridge_dev->mc)
return NOTIFY_DONE;
smp_rmb();
if ((pvt->mce_out + 1) % MCE_LOG_LEN == pvt->mce_in) {
smp_wmb();
pvt->mce_overrun++;
return NOTIFY_DONE;
}
/* Copy memory error at the ringbuffer */
memcpy(&pvt->mce_entry[pvt->mce_out], mce, sizeof(*mce));
smp_wmb();
pvt->mce_out = (pvt->mce_out + 1) % MCE_LOG_LEN;
/* Handle fatal errors immediately */
if (mce->mcgstatus & 1)
sbridge_check_error(mci);
/* Advice mcelog that the error were handled */
return NOTIFY_STOP;
}
static struct notifier_block sbridge_mce_dec = {
.notifier_call = sbridge_mce_check_error,
};
/****************************************************************************
EDAC register/unregister logic
****************************************************************************/
static void sbridge_unregister_mci(struct sbridge_dev *sbridge_dev)
{
struct mem_ctl_info *mci = sbridge_dev->mci;
struct sbridge_pvt *pvt;
if (unlikely(!mci || !mci->pvt_info)) {
edac_dbg(0, "MC: dev = %p\n", &sbridge_dev->pdev[0]->dev);
sbridge_printk(KERN_ERR, "Couldn't find mci handler\n");
return;
}
pvt = mci->pvt_info;
edac_dbg(0, "MC: mci = %p, dev = %p\n",
mci, &sbridge_dev->pdev[0]->dev);
/* Remove MC sysfs nodes */
edac_mc_del_mc(mci->pdev);
edac_dbg(1, "%s: free mci struct\n", mci->ctl_name);
kfree(mci->ctl_name);
edac_mc_free(mci);
sbridge_dev->mci = NULL;
}
static int sbridge_register_mci(struct sbridge_dev *sbridge_dev)
{
struct mem_ctl_info *mci;
struct edac_mc_layer layers[2];
struct sbridge_pvt *pvt;
int rc;
/* Check the number of active and not disabled channels */
rc = check_if_ecc_is_active(sbridge_dev->bus);
if (unlikely(rc < 0))
return rc;
/* allocate a new MC control structure */
layers[0].type = EDAC_MC_LAYER_CHANNEL;
layers[0].size = NUM_CHANNELS;
layers[0].is_virt_csrow = false;
layers[1].type = EDAC_MC_LAYER_SLOT;
layers[1].size = MAX_DIMMS;
layers[1].is_virt_csrow = true;
mci = edac_mc_alloc(sbridge_dev->mc, ARRAY_SIZE(layers), layers,
sizeof(*pvt));
if (unlikely(!mci))
return -ENOMEM;
edac_dbg(0, "MC: mci = %p, dev = %p\n",
mci, &sbridge_dev->pdev[0]->dev);
pvt = mci->pvt_info;
memset(pvt, 0, sizeof(*pvt));
/* Associate sbridge_dev and mci for future usage */
pvt->sbridge_dev = sbridge_dev;
sbridge_dev->mci = mci;
mci->mtype_cap = MEM_FLAG_DDR3;
mci->edac_ctl_cap = EDAC_FLAG_NONE;
mci->edac_cap = EDAC_FLAG_NONE;
mci->mod_name = "sbridge_edac.c";
mci->mod_ver = SBRIDGE_REVISION;
mci->ctl_name = kasprintf(GFP_KERNEL, "Sandy Bridge Socket#%d", mci->mc_idx);
mci->dev_name = pci_name(sbridge_dev->pdev[0]);
mci->ctl_page_to_phys = NULL;
/* Set the function pointer to an actual operation function */
mci->edac_check = sbridge_check_error;
/* Store pci devices at mci for faster access */
rc = mci_bind_devs(mci, sbridge_dev);
if (unlikely(rc < 0))
goto fail0;
/* Get dimm basic config and the memory layout */
get_dimm_config(mci);
get_memory_layout(mci);
/* record ptr to the generic device */
mci->pdev = &sbridge_dev->pdev[0]->dev;
/* add this new MC control structure to EDAC's list of MCs */
if (unlikely(edac_mc_add_mc(mci))) {
edac_dbg(0, "MC: failed edac_mc_add_mc()\n");
rc = -EINVAL;
goto fail0;
}
return 0;
fail0:
kfree(mci->ctl_name);
edac_mc_free(mci);
sbridge_dev->mci = NULL;
return rc;
}
/*
* sbridge_probe Probe for ONE instance of device to see if it is
* present.
* return:
* 0 for FOUND a device
* < 0 for error code
*/
static int __devinit sbridge_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int rc;
u8 mc, num_mc = 0;
struct sbridge_dev *sbridge_dev;
/* get the pci devices we want to reserve for our use */
mutex_lock(&sbridge_edac_lock);
/*
* All memory controllers are allocated at the first pass.
*/
if (unlikely(probed >= 1)) {
mutex_unlock(&sbridge_edac_lock);
return -ENODEV;
}
probed++;
rc = sbridge_get_all_devices(&num_mc);
if (unlikely(rc < 0))
goto fail0;
mc = 0;
list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
edac_dbg(0, "Registering MC#%d (%d of %d)\n",
mc, mc + 1, num_mc);
sbridge_dev->mc = mc++;
rc = sbridge_register_mci(sbridge_dev);
if (unlikely(rc < 0))
goto fail1;
}
sbridge_printk(KERN_INFO, "Driver loaded.\n");
mutex_unlock(&sbridge_edac_lock);
return 0;
fail1:
list_for_each_entry(sbridge_dev, &sbridge_edac_list, list)
sbridge_unregister_mci(sbridge_dev);
sbridge_put_all_devices();
fail0:
mutex_unlock(&sbridge_edac_lock);
return rc;
}
/*
* sbridge_remove destructor for one instance of device
*
*/
static void __devexit sbridge_remove(struct pci_dev *pdev)
{
struct sbridge_dev *sbridge_dev;
edac_dbg(0, "\n");
/*
* we have a trouble here: pdev value for removal will be wrong, since
* it will point to the X58 register used to detect that the machine
* is a Nehalem or upper design. However, due to the way several PCI
* devices are grouped together to provide MC functionality, we need
* to use a different method for releasing the devices
*/
mutex_lock(&sbridge_edac_lock);
if (unlikely(!probed)) {
mutex_unlock(&sbridge_edac_lock);
return;
}
list_for_each_entry(sbridge_dev, &sbridge_edac_list, list)
sbridge_unregister_mci(sbridge_dev);
/* Release PCI resources */
sbridge_put_all_devices();
probed--;
mutex_unlock(&sbridge_edac_lock);
}
MODULE_DEVICE_TABLE(pci, sbridge_pci_tbl);
/*
* sbridge_driver pci_driver structure for this module
*
*/
static struct pci_driver sbridge_driver = {
.name = "sbridge_edac",
.probe = sbridge_probe,
.remove = __devexit_p(sbridge_remove),
.id_table = sbridge_pci_tbl,
};
/*
* sbridge_init Module entry function
* Try to initialize this module for its devices
*/
static int __init sbridge_init(void)
{
int pci_rc;
edac_dbg(2, "\n");
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
pci_rc = pci_register_driver(&sbridge_driver);
if (pci_rc >= 0) {
mce_register_decode_chain(&sbridge_mce_dec);
return 0;
}
sbridge_printk(KERN_ERR, "Failed to register device with error %d.\n",
pci_rc);
return pci_rc;
}
/*
* sbridge_exit() Module exit function
* Unregister the driver
*/
static void __exit sbridge_exit(void)
{
edac_dbg(2, "\n");
pci_unregister_driver(&sbridge_driver);
mce_unregister_decode_chain(&sbridge_mce_dec);
}
module_init(sbridge_init);
module_exit(sbridge_exit);
module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("MC Driver for Intel Sandy Bridge memory controllers - "
SBRIDGE_REVISION);
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