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i7core_edac: Adds write unlock to MC registers

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The public Intel Xeon 5500 volume 2 datasheet describes, on page 53,
session 2.6.7 a register that can lock/unlock Memory Controller the
configuration register, called MC_CFG_CONTROL.

Adds support for it in the hope that software error injection would
work. With my tests with Xeon 35xx, there's still something missing.
With a program that does sequencial bit writes at dev 0.0, sometimes, it
produces error injection, after unblocking the MC_CFG_CONTROL (and,
sometimes, it just locks my testing machine).

I'll try later to discover by trial and error what's the register that
solves this issue on Xeon 35xx.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2009-07-09 22:14:35 -03:00
parent d5381642ab
commit e9bd2e7379
2 changed files with 28 additions and 3 deletions
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30
drivers/edac/i7core_edac.c
View File

@ -33,7 +33,7 @@
#include "edac_core.h"
/* To use the new pci_[read/write]_config_qword instead of two dword */
#define USE_QWORD 1
#define USE_QWORD 0
/*
* Alter this version for the module when modifications are made
@ -58,6 +58,10 @@
* i7core Memory Controller Registers
*/
/* OFFSETS for Device 0 Function 0 */
#define MC_CFG_CONTROL 0x90
/* OFFSETS for Device 3 Function 0 */
#define MC_CONTROL 0x48
@ -186,6 +190,7 @@ struct pci_id_descr {
};
struct i7core_pvt {
struct pci_dev *pci_noncore;
struct pci_dev *pci_mcr[MAX_MCR_FUNC + 1];
struct pci_dev *pci_ch[NUM_CHANS][MAX_CHAN_FUNC + 1];
struct i7core_info info;
@ -222,6 +227,9 @@ struct pci_id_descr pci_devs[] = {
{ PCI_DESCR(3, 2, PCI_DEVICE_ID_INTEL_I7_MC_RAS) }, /* if RDIMM is supported */
{ PCI_DESCR(3, 4, PCI_DEVICE_ID_INTEL_I7_MC_TEST) },
/* Generic Non-core registers */
{ PCI_DESCR(0, 0, PCI_DEVICE_ID_INTEL_I7_NOCORE) },
/* Channel 0 */
{ PCI_DESCR(4, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH0_CTRL) },
{ PCI_DESCR(4, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH0_ADDR) },
@ -882,6 +890,16 @@ static ssize_t i7core_inject_enable_store(struct mem_ctl_info *mci,
else
mask |= (pvt->inject.col & 0x3fffL);
/* Unlock writes to registers */
pci_write_config_dword(pvt->pci_noncore, MC_CFG_CONTROL, 0x2);
msleep(100);
/* Zeroes error count registers */
pci_write_config_dword(pvt->pci_mcr[4], MC_TEST_ERR_RCV1, 0);
pci_write_config_dword(pvt->pci_mcr[4], MC_TEST_ERR_RCV0, 0);
pvt->ce_count_available = 0;
#if USE_QWORD
pci_write_config_qword(pvt->pci_ch[pvt->inject.channel][0],
MC_CHANNEL_ADDR_MATCH, mask);
@ -929,12 +947,15 @@ static ssize_t i7core_inject_enable_store(struct mem_ctl_info *mci,
pci_write_config_dword(pvt->pci_ch[pvt->inject.channel][0],
MC_CHANNEL_ERROR_MASK, injectmask);
#if 0
/* lock writes to registers */
pci_write_config_dword(pvt->pci_noncore, MC_CFG_CONTROL, 0);
#endif
debugf0("Error inject addr match 0x%016llx, ecc 0x%08x,"
" inject 0x%08x\n",
mask, pvt->inject.eccmask, injectmask);
return count;
}
@ -1124,12 +1145,15 @@ static int mci_bind_devs(struct mem_ctl_info *mci)
if (unlikely(func > MAX_CHAN_FUNC))
goto error;
pvt->pci_ch[slot - 4][func] = pdev;
} else
} else if (!slot && !func)
pvt->pci_noncore = pdev;
else
goto error;
debugf0("Associated fn %d.%d, dev = %p\n",
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), pdev);
}
return 0;
error:

1
include/linux/pci_ids.h
View File

@ -2548,6 +2548,7 @@
#define PCI_DEVICE_ID_INTEL_I7_MC_CH2_ADDR 0x2c31
#define PCI_DEVICE_ID_INTEL_I7_MC_CH2_RANK 0x2c32
#define PCI_DEVICE_ID_INTEL_I7_MC_CH2_TC 0x2c33
#define PCI_DEVICE_ID_INTEL_I7_NOCORE 0x2c41
#define PCI_DEVICE_ID_INTEL_82855PM_HB 0x3340
#define PCI_DEVICE_ID_INTEL_IOAT_TBG4 0x3429
#define PCI_DEVICE_ID_INTEL_IOAT_TBG5 0x342a