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linux-next/drivers/edac/i82975x_edac.c
Arvind Yadav f5c61277f6 EDAC, i82975x: Add ioremap_nocache() error handling 
If ioremap_nocache() fails, it will return NULL. Which will then cause a
NULL-pointer dereference. Handle the returned value properly.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: "Arvind R." <arvino55@gmail.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1484549092-11349-1-git-send-email-arvind.yadav.cs@gmail.com
[ Boris: massage commit message and improve error message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
2017-01-16 11:09:22 +01:00

717 lines
18 KiB
C
Raw Blame History

/*
* Intel 82975X Memory Controller kernel module
* (C) 2007 aCarLab (India) Pvt. Ltd. (http://acarlab.com)
* (C) 2007 jetzbroadband (http://jetzbroadband.com)
* This file may be distributed under the terms of the
* GNU General Public License.
*
* Written by Arvind R.
* Copied from i82875p_edac.c source:
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/edac.h>
#include "edac_module.h"
#define I82975X_REVISION " Ver: 1.0.0"
#define EDAC_MOD_STR "i82975x_edac"
#define i82975x_printk(level, fmt, arg...) \
edac_printk(level, "i82975x", fmt, ##arg)
#define i82975x_mc_printk(mci, level, fmt, arg...) \
edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg)
#ifndef PCI_DEVICE_ID_INTEL_82975_0
#define PCI_DEVICE_ID_INTEL_82975_0 0x277c
#endif /* PCI_DEVICE_ID_INTEL_82975_0 */
#define I82975X_NR_DIMMS 8
#define I82975X_NR_CSROWS(nr_chans) (I82975X_NR_DIMMS / (nr_chans))
/* Intel 82975X register addresses - device 0 function 0 - DRAM Controller */
#define I82975X_EAP 0x58 /* Dram Error Address Pointer (32b)
*
* 31:7 128 byte cache-line address
* 6:1 reserved
* 0 0: CH0; 1: CH1
*/
#define I82975X_DERRSYN 0x5c /* Dram Error SYNdrome (8b)
*
* 7:0 DRAM ECC Syndrome
*/
#define I82975X_DES 0x5d /* Dram ERRor DeSTination (8b)
* 0h: Processor Memory Reads
* 1h:7h reserved
* More - See Page 65 of Intel DocSheet.
*/
#define I82975X_ERRSTS 0xc8 /* Error Status Register (16b)
*
* 15:12 reserved
* 11 Thermal Sensor Event
* 10 reserved
* 9 non-DRAM lock error (ndlock)
* 8 Refresh Timeout
* 7:2 reserved
* 1 ECC UE (multibit DRAM error)
* 0 ECC CE (singlebit DRAM error)
*/
/* Error Reporting is supported by 3 mechanisms:
1. DMI SERR generation ( ERRCMD )
2. SMI DMI generation ( SMICMD )
3. SCI DMI generation ( SCICMD )
NOTE: Only ONE of the three must be enabled
*/
#define I82975X_ERRCMD 0xca /* Error Command (16b)
*
* 15:12 reserved
* 11 Thermal Sensor Event
* 10 reserved
* 9 non-DRAM lock error (ndlock)
* 8 Refresh Timeout
* 7:2 reserved
* 1 ECC UE (multibit DRAM error)
* 0 ECC CE (singlebit DRAM error)
*/
#define I82975X_SMICMD 0xcc /* Error Command (16b)
*
* 15:2 reserved
* 1 ECC UE (multibit DRAM error)
* 0 ECC CE (singlebit DRAM error)
*/
#define I82975X_SCICMD 0xce /* Error Command (16b)
*
* 15:2 reserved
* 1 ECC UE (multibit DRAM error)
* 0 ECC CE (singlebit DRAM error)
*/
#define I82975X_XEAP 0xfc /* Extended Dram Error Address Pointer (8b)
*
* 7:1 reserved
* 0 Bit32 of the Dram Error Address
*/
#define I82975X_MCHBAR 0x44 /*
*
* 31:14 Base Addr of 16K memory-mapped
* configuration space
* 13:1 reserverd
* 0 mem-mapped config space enable
*/
/* NOTE: Following addresses have to indexed using MCHBAR offset (44h, 32b) */
/* Intel 82975x memory mapped register space */
#define I82975X_DRB_SHIFT 25 /* fixed 32MiB grain */
#define I82975X_DRB 0x100 /* DRAM Row Boundary (8b x 8)
*
* 7 set to 1 in highest DRB of
* channel if 4GB in ch.
* 6:2 upper boundary of rank in
* 32MB grains
* 1:0 set to 0
*/
#define I82975X_DRB_CH0R0 0x100
#define I82975X_DRB_CH0R1 0x101
#define I82975X_DRB_CH0R2 0x102
#define I82975X_DRB_CH0R3 0x103
#define I82975X_DRB_CH1R0 0x180
#define I82975X_DRB_CH1R1 0x181
#define I82975X_DRB_CH1R2 0x182
#define I82975X_DRB_CH1R3 0x183
#define I82975X_DRA 0x108 /* DRAM Row Attribute (4b x 8)
* defines the PAGE SIZE to be used
* for the rank
* 7 reserved
* 6:4 row attr of odd rank, i.e. 1
* 3 reserved
* 2:0 row attr of even rank, i.e. 0
*
* 000 = unpopulated
* 001 = reserved
* 010 = 4KiB
* 011 = 8KiB
* 100 = 16KiB
* others = reserved
*/
#define I82975X_DRA_CH0R01 0x108
#define I82975X_DRA_CH0R23 0x109
#define I82975X_DRA_CH1R01 0x188
#define I82975X_DRA_CH1R23 0x189
#define I82975X_BNKARC 0x10e /* Type of device in each rank - Bank Arch (16b)
*
* 15:8 reserved
* 7:6 Rank 3 architecture
* 5:4 Rank 2 architecture
* 3:2 Rank 1 architecture
* 1:0 Rank 0 architecture
*
* 00 => 4 banks
* 01 => 8 banks
*/
#define I82975X_C0BNKARC 0x10e
#define I82975X_C1BNKARC 0x18e
#define I82975X_DRC 0x120 /* DRAM Controller Mode0 (32b)
*
* 31:30 reserved
* 29 init complete
* 28:11 reserved, according to Intel
* 22:21 number of channels
* 00=1 01=2 in 82875
* seems to be ECC mode
* bits in 82975 in Asus
* P5W
* 19:18 Data Integ Mode
* 00=none 01=ECC in 82875
* 10:8 refresh mode
* 7 reserved
* 6:4 mode select
* 3:2 reserved
* 1:0 DRAM type 10=Second Revision
* DDR2 SDRAM
* 00, 01, 11 reserved
*/
#define I82975X_DRC_CH0M0 0x120
#define I82975X_DRC_CH1M0 0x1A0
#define I82975X_DRC_M1 0x124 /* DRAM Controller Mode1 (32b)
* 31 0=Standard Address Map
* 1=Enhanced Address Map
* 30:0 reserved
*/
#define I82975X_DRC_CH0M1 0x124
#define I82975X_DRC_CH1M1 0x1A4
enum i82975x_chips {
I82975X = 0,
};
struct i82975x_pvt {
void __iomem *mch_window;
};
struct i82975x_dev_info {
const char *ctl_name;
};
struct i82975x_error_info {
u16 errsts;
u32 eap;
u8 des;
u8 derrsyn;
u16 errsts2;
u8 chan; /* the channel is bit 0 of EAP */
u8 xeap; /* extended eap bit */
};
static const struct i82975x_dev_info i82975x_devs[] = {
[I82975X] = {
.ctl_name = "i82975x"
},
};
static struct pci_dev *mci_pdev; /* init dev: in case that AGP code has
* already registered driver
*/
static int i82975x_registered = 1;
static void i82975x_get_error_info(struct mem_ctl_info *mci,
struct i82975x_error_info *info)
{
struct pci_dev *pdev;
pdev = to_pci_dev(mci->pdev);
/*
* This is a mess because there is no atomic way to read all the
* registers at once and the registers can transition from CE being
* overwritten by UE.
*/
pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts);
pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
pci_read_config_byte(pdev, I82975X_DES, &info->des);
pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn);
pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2);
pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003);
/*
* If the error is the same then we can for both reads then
* the first set of reads is valid. If there is a change then
* there is a CE no info and the second set of reads is valid
* and should be UE info.
*/
if (!(info->errsts2 & 0x0003))
return;
if ((info->errsts ^ info->errsts2) & 0x0003) {
pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
pci_read_config_byte(pdev, I82975X_DES, &info->des);
pci_read_config_byte(pdev, I82975X_DERRSYN,
&info->derrsyn);
}
}
static int i82975x_process_error_info(struct mem_ctl_info *mci,
struct i82975x_error_info *info, int handle_errors)
{
int row, chan;
unsigned long offst, page;
if (!(info->errsts2 & 0x0003))
return 0;
if (!handle_errors)
return 1;
if ((info->errsts ^ info->errsts2) & 0x0003) {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
-1, -1, -1, "UE overwrote CE", "");
info->errsts = info->errsts2;
}
page = (unsigned long) info->eap;
page >>= 1;
if (info->xeap & 1)
page |= 0x80000000;
page >>= (PAGE_SHIFT - 1);
row = edac_mc_find_csrow_by_page(mci, page);
if (row == -1) {
i82975x_mc_printk(mci, KERN_ERR, "error processing EAP:\n"
"\tXEAP=%u\n"
"\t EAP=0x%08x\n"
"\tPAGE=0x%08x\n",
(info->xeap & 1) ? 1 : 0, info->eap, (unsigned int) page);
return 0;
}
chan = (mci->csrows[row]->nr_channels == 1) ? 0 : info->eap & 1;
offst = info->eap
& ((1 << PAGE_SHIFT) -
(1 << mci->csrows[row]->channels[chan]->dimm->grain));
if (info->errsts & 0x0002)
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
page, offst, 0,
row, -1, -1,
"i82975x UE", "");
else
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
page, offst, info->derrsyn,
row, chan ? chan : 0, -1,
"i82975x CE", "");
return 1;
}
static void i82975x_check(struct mem_ctl_info *mci)
{
struct i82975x_error_info info;
edac_dbg(1, "MC%d\n", mci->mc_idx);
i82975x_get_error_info(mci, &info);
i82975x_process_error_info(mci, &info, 1);
}
/* Return 1 if dual channel mode is active. Else return 0. */
static int dual_channel_active(void __iomem *mch_window)
{
/*
* We treat interleaved-symmetric configuration as dual-channel - EAP's
* bit-0 giving the channel of the error location.
*
* All other configurations are treated as single channel - the EAP's
* bit-0 will resolve ok in symmetric area of mixed
* (symmetric/asymmetric) configurations
*/
u8 drb[4][2];
int row;
int dualch;
for (dualch = 1, row = 0; dualch && (row < 4); row++) {
drb[row][0] = readb(mch_window + I82975X_DRB + row);
drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
dualch = dualch && (drb[row][0] == drb[row][1]);
}
return dualch;
}
static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
{
/*
* ECC is possible on i92975x ONLY with DEV_X8
*/
return DEV_X8;
}
static void i82975x_init_csrows(struct mem_ctl_info *mci,
struct pci_dev *pdev, void __iomem *mch_window)
{
struct csrow_info *csrow;
unsigned long last_cumul_size;
u8 value;
u32 cumul_size, nr_pages;
int index, chan;
struct dimm_info *dimm;
enum dev_type dtype;
last_cumul_size = 0;
/*
* 82875 comment:
* The dram row boundary (DRB) reg values are boundary address
* for each DRAM row with a granularity of 32 or 64MB (single/dual
* channel operation). DRB regs are cumulative; therefore DRB7 will
* contain the total memory contained in all rows.
*
*/
for (index = 0; index < mci->nr_csrows; index++) {
csrow = mci->csrows[index];
value = readb(mch_window + I82975X_DRB + index +
((index >= 4) ? 0x80 : 0));
cumul_size = value;
cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
/*
* Adjust cumul_size w.r.t number of channels
*
*/
if (csrow->nr_channels > 1)
cumul_size <<= 1;
edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
nr_pages = cumul_size - last_cumul_size;
if (!nr_pages)
continue;
/*
* Initialise dram labels
* index values:
* [0-7] for single-channel; i.e. csrow->nr_channels = 1
* [0-3] for dual-channel; i.e. csrow->nr_channels = 2
*/
dtype = i82975x_dram_type(mch_window, index);
for (chan = 0; chan < csrow->nr_channels; chan++) {
dimm = mci->csrows[index]->channels[chan]->dimm;
dimm->nr_pages = nr_pages / csrow->nr_channels;
snprintf(csrow->channels[chan]->dimm->label, EDAC_MC_LABEL_LEN, "DIMM %c%d",
(chan == 0) ? 'A' : 'B',
index);
dimm->grain = 1 << 7; /* 128Byte cache-line resolution */
dimm->dtype = i82975x_dram_type(mch_window, index);
dimm->mtype = MEM_DDR2; /* I82975x supports only DDR2 */
dimm->edac_mode = EDAC_SECDED; /* only supported */
}
csrow->first_page = last_cumul_size;
csrow->last_page = cumul_size - 1;
last_cumul_size = cumul_size;
}
}
/* #define i82975x_DEBUG_IOMEM */
#ifdef i82975x_DEBUG_IOMEM
static void i82975x_print_dram_timings(void __iomem *mch_window)
{
/*
* The register meanings are from Intel specs;
* (shows 13-5-5-5 for 800-DDR2)
* Asus P5W Bios reports 15-5-4-4
* What's your religion?
*/
static const int caslats[4] = { 5, 4, 3, 6 };
u32 dtreg[2];
dtreg[0] = readl(mch_window + 0x114);
dtreg[1] = readl(mch_window + 0x194);
i82975x_printk(KERN_INFO, "DRAM Timings : Ch0 Ch1\n"
" RAS Active Min = %d %d\n"
" CAS latency = %d %d\n"
" RAS to CAS = %d %d\n"
" RAS precharge = %d %d\n",
(dtreg[0] >> 19 ) & 0x0f,
(dtreg[1] >> 19) & 0x0f,
caslats[(dtreg[0] >> 8) & 0x03],
caslats[(dtreg[1] >> 8) & 0x03],
((dtreg[0] >> 4) & 0x07) + 2,
((dtreg[1] >> 4) & 0x07) + 2,
(dtreg[0] & 0x07) + 2,
(dtreg[1] & 0x07) + 2
);
}
#endif
static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
{
int rc = -ENODEV;
struct mem_ctl_info *mci;
struct edac_mc_layer layers[2];
struct i82975x_pvt *pvt;
void __iomem *mch_window;
u32 mchbar;
u32 drc[2];
struct i82975x_error_info discard;
int chans;
#ifdef i82975x_DEBUG_IOMEM
u8 c0drb[4];
u8 c1drb[4];
#endif
edac_dbg(0, "\n");
pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
if (!(mchbar & 1)) {
edac_dbg(3, "failed, MCHBAR disabled!\n");
goto fail0;
}
mchbar &= 0xffffc000; /* bits 31:14 used for 16K window */
mch_window = ioremap_nocache(mchbar, 0x1000);
if (!mch_window) {
edac_dbg(3, "error ioremapping MCHBAR!\n");
goto fail0;
}
#ifdef i82975x_DEBUG_IOMEM
i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
mchbar, mch_window);
c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
#endif
drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
#ifdef i82975x_DEBUG_IOMEM
i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
((drc[0] >> 21) & 3) == 1 ?
"ECC enabled" : "ECC disabled");
i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
((drc[1] >> 21) & 3) == 1 ?
"ECC enabled" : "ECC disabled");
i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
readw(mch_window + I82975X_C0BNKARC));
i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
readw(mch_window + I82975X_C1BNKARC));
i82975x_print_dram_timings(mch_window);
goto fail1;
#endif
if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) {
i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
goto fail1;
}
chans = dual_channel_active(mch_window) + 1;
/* assuming only one controller, index thus is 0 */
layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
layers[0].size = I82975X_NR_DIMMS;
layers[0].is_virt_csrow = true;
layers[1].type = EDAC_MC_LAYER_CHANNEL;
layers[1].size = I82975X_NR_CSROWS(chans);
layers[1].is_virt_csrow = false;
mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
if (!mci) {
rc = -ENOMEM;
goto fail1;
}
edac_dbg(3, "init mci\n");
mci->pdev = &pdev->dev;
mci->mtype_cap = MEM_FLAG_DDR2;
mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
mci->mod_name = EDAC_MOD_STR;
mci->mod_ver = I82975X_REVISION;
mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
mci->dev_name = pci_name(pdev);
mci->edac_check = i82975x_check;
mci->ctl_page_to_phys = NULL;
edac_dbg(3, "init pvt\n");
pvt = (struct i82975x_pvt *) mci->pvt_info;
pvt->mch_window = mch_window;
i82975x_init_csrows(mci, pdev, mch_window);
mci->scrub_mode = SCRUB_HW_SRC;
i82975x_get_error_info(mci, &discard); /* clear counters */
/* finalize this instance of memory controller with edac core */
if (edac_mc_add_mc(mci)) {
edac_dbg(3, "failed edac_mc_add_mc()\n");
goto fail2;
}
/* get this far and it's successful */
edac_dbg(3, "success\n");
return 0;
fail2:
edac_mc_free(mci);
fail1:
iounmap(mch_window);
fail0:
return rc;
}
/* returns count (>= 0), or negative on error */
static int i82975x_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int rc;
edac_dbg(0, "\n");
if (pci_enable_device(pdev) < 0)
return -EIO;
rc = i82975x_probe1(pdev, ent->driver_data);
if (mci_pdev == NULL)
mci_pdev = pci_dev_get(pdev);
return rc;
}
static void i82975x_remove_one(struct pci_dev *pdev)
{
struct mem_ctl_info *mci;
struct i82975x_pvt *pvt;
edac_dbg(0, "\n");
mci = edac_mc_del_mc(&pdev->dev);
if (mci == NULL)
return;
pvt = mci->pvt_info;
if (pvt->mch_window)
iounmap( pvt->mch_window );
edac_mc_free(mci);
}
static const struct pci_device_id i82975x_pci_tbl[] = {
{
PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
I82975X
},
{
0,
} /* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);
static struct pci_driver i82975x_driver = {
.name = EDAC_MOD_STR,
.probe = i82975x_init_one,
.remove = i82975x_remove_one,
.id_table = i82975x_pci_tbl,
};
static int __init i82975x_init(void)
{
int pci_rc;
edac_dbg(3, "\n");
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
pci_rc = pci_register_driver(&i82975x_driver);
if (pci_rc < 0)
goto fail0;
if (mci_pdev == NULL) {
mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82975_0, NULL);
if (!mci_pdev) {
edac_dbg(0, "i82975x pci_get_device fail\n");
pci_rc = -ENODEV;
goto fail1;
}
pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);
if (pci_rc < 0) {
edac_dbg(0, "i82975x init fail\n");
pci_rc = -ENODEV;
goto fail1;
}
}
return 0;
fail1:
pci_unregister_driver(&i82975x_driver);
fail0:
pci_dev_put(mci_pdev);
return pci_rc;
}
static void __exit i82975x_exit(void)
{
edac_dbg(3, "\n");
pci_unregister_driver(&i82975x_driver);
if (!i82975x_registered) {
i82975x_remove_one(mci_pdev);
pci_dev_put(mci_pdev);
}
}
module_init(i82975x_init);
module_exit(i82975x_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arvind R. <arvino55@gmail.com>");
MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");
module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
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