leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

amd64_edac: cleanup amd64_check_ecc_enabled

Browse Source 
Simplify code flow and make sure return value is always valid since
further driver init depends on it. Carve out long warning string and
make code more readable. Shorten some names, while at it.

There should be no functional change resulting from this patch.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
This commit is contained in:
Borislav Petkov 2009-08-05 15:47:22 +02:00
parent 6a8126911a
commit be3468e8ff
1 changed files with 25 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
drivers/edac/amd64_edac.c
View File

@ -2783,7 +2783,7 @@ static void check_mcg_ctl(void *ret)
}
/* check MCG_CTL on all the cpus on this node */
static int amd64_mcg_ctl_enabled_on_cpus(const cpumask_t *mask)
static int mcg_ctl_enabled_on_node(const struct cpumask *mask)
{
int ret = 1;
preempt_disable();
@ -2799,71 +2799,45 @@ static int amd64_mcg_ctl_enabled_on_cpus(const cpumask_t *mask)
* the memory system completely. A command line option allows to force-enable
* hardware ECC later in amd64_enable_ecc_error_reporting().
*/
static const char *ecc_warning =
"WARNING: ECC is disabled by BIOS. Module will NOT be loaded.\n"
" Either Enable ECC in the BIOS, or set 'ecc_enable_override'.\n"
" Also, use of the override can cause unknown side effects.\n";
static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
{
u32 value;
int err = 0, ret = 0;
u8 ecc_enabled = 0;
int err = 0;
u8 ecc_enabled = 0, mcg_ctl_en = 0;
err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &value);
if (err)
debugf0("Reading K8_NBCTL failed\n");
ecc_enabled = !!(value & K8_NBCFG_ECC_ENABLE);
if (!ecc_enabled)
amd64_printk(KERN_WARNING, "This node reports that Memory ECC "
"is currently disabled, set F3x%x[22] (%s).\n",
K8_NBCFG, pci_name(pvt->misc_f3_ctl));
else
amd64_printk(KERN_INFO, "ECC is enabled by BIOS.\n");
ret = amd64_mcg_ctl_enabled_on_cpus(cpumask_of_node(pvt->mc_node_id));
mcg_ctl_en = mcg_ctl_enabled_on_node(cpumask_of_node(pvt->mc_node_id));
if (!mcg_ctl_en)
amd64_printk(KERN_WARNING, "NB MCE bank disabled, set MSR "
"0x%08x[4] on node %d to enable.\n",
MSR_IA32_MCG_CTL, pvt->mc_node_id);
debugf0("K8_NBCFG=0x%x, DRAM ECC is %s\n", value,
(value & K8_NBCFG_ECC_ENABLE ? "enabled" : "disabled"));
if (!ecc_enabled || !ret) {
if (!ecc_enabled) {
amd64_printk(KERN_WARNING, "This node reports that "
"Memory ECC is currently "
"disabled.\n");
amd64_printk(KERN_WARNING, "bit 0x%lx in register "
"F3x%x of the MISC_CONTROL device (%s) "
"should be enabled\n", K8_NBCFG_ECC_ENABLE,
K8_NBCFG, pci_name(pvt->misc_f3_ctl));
}
if (!ret) {
amd64_printk(KERN_WARNING, "bit 0x%016lx in MSR 0x%08x "
"of node %d should be enabled\n",
K8_MSR_MCGCTL_NBE, MSR_IA32_MCG_CTL,
pvt->mc_node_id);
}
if (!ecc_enabled || !mcg_ctl_en) {
if (!ecc_enable_override) {
amd64_printk(KERN_WARNING, "WARNING: ECC is NOT "
"currently enabled by the BIOS. Module "
"will NOT be loaded.\n"
" Either Enable ECC in the BIOS, "
"or use the 'ecc_enable_override' "
"parameter.\n"
" Might be a BIOS bug, if BIOS says "
"ECC is enabled\n"
" Use of the override can cause "
"unknown side effects.\n");
ret = -ENODEV;
} else
/*
* enable further driver loading if ECC enable is
* overridden.
*/
ret = 0;
} else {
amd64_printk(KERN_INFO,
"ECC is enabled by BIOS, Proceeding "
"with EDAC module initialization\n");
/* Signal good ECC status */
ret = 0;
amd64_printk(KERN_WARNING, "%s", ecc_warning);
return -ENODEV;
}
} else
/* CLEAR the override, since BIOS controlled it */
ecc_enable_override = 0;
}
return ret;
return 0;
}
struct mcidev_sysfs_attribute sysfs_attrs[ARRAY_SIZE(amd64_dbg_attrs) +