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amd64_edac: check NB MCE bank enable on the current node properly 

The old code was using smp_call_function_many which skips the current
cpu if it is in the supplied cpumask. Switch to the rdmsr_on_cpus()
interface which takes care of that.

In addition, add get_cpus_on_this_dct_cpumask helper which computes a
cpumask of all the cores on a node and thus on a DCT.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
This commit is contained in:
Borislav Petkov 2009-09-16 13:05:46 +02:00
parent 57a30854c8
commit 06724535f8
1 changed files with 45 additions and 21 deletions
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66
drivers/edac/amd64_edac.c
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@ -2741,30 +2741,53 @@ static void amd64_restore_ecc_error_reporting(struct amd64_pvt *pvt)
wrmsr_on_cpus(cpumask, K8_MSR_MCGCTL, msrs);
}
static void check_mcg_ctl(void *ret)
/* get all cores on this DCT */
static void get_cpus_on_this_dct_cpumask(cpumask_t *mask, int nid)
{
u64 msr_val = 0;
u8 nbe;
int cpu;
rdmsrl(MSR_IA32_MCG_CTL, msr_val);
nbe = msr_val & K8_MSR_MCGCTL_NBE;
debugf0("core: %u, MCG_CTL: 0x%llx, NB MSR is %s\n",
raw_smp_processor_id(), msr_val,
(nbe ? "enabled" : "disabled"));
if (!nbe)
*(int *)ret = 0;
for_each_online_cpu(cpu)
if (amd_get_nb_id(cpu) == nid)
cpumask_set_cpu(cpu, mask);
}
/* check MCG_CTL on all the cpus on this node */
static int mcg_ctl_enabled_on_node(const struct cpumask *mask)
static bool amd64_nb_mce_bank_enabled_on_node(int nid)
{
int ret = 1;
preempt_disable();
smp_call_function_many(mask, check_mcg_ctl, &ret, 1);
preempt_enable();
cpumask_t mask;
struct msr *msrs;
int cpu, nbe, idx = 0;
bool ret = false;
cpumask_clear(&mask);
get_cpus_on_this_dct_cpumask(&mask, nid);
msrs = kzalloc(sizeof(struct msr) * cpumask_weight(&mask), GFP_KERNEL);
if (!msrs) {
amd64_printk(KERN_WARNING, "%s: error allocating msrs\n",
__func__);
return false;
}
rdmsr_on_cpus(&mask, MSR_IA32_MCG_CTL, msrs);
for_each_cpu(cpu, &mask) {
nbe = msrs[idx].l & K8_MSR_MCGCTL_NBE;
debugf0("core: %u, MCG_CTL: 0x%llx, NB MSR is %s\n",
cpu, msrs[idx].q,
(nbe ? "enabled" : "disabled"));
if (!nbe)
goto out;
idx++;
}
ret = true;
out:
kfree(msrs);
return ret;
}
@ -2783,7 +2806,8 @@ static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
{
u32 value;
int err = 0;
u8 ecc_enabled = 0, mcg_ctl_en = 0;
u8 ecc_enabled = 0;
bool nb_mce_en = false;
err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &value);
if (err)
@ -2797,13 +2821,13 @@ static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
else
amd64_printk(KERN_INFO, "ECC is enabled by BIOS.\n");
mcg_ctl_en = mcg_ctl_enabled_on_node(cpumask_of_node(pvt->mc_node_id));
if (!mcg_ctl_en)
nb_mce_en = amd64_nb_mce_bank_enabled_on_node(pvt->mc_node_id);
if (!nb_mce_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);
if (!ecc_enabled || !mcg_ctl_en) {
if (!ecc_enabled || !nb_mce_en) {
if (!ecc_enable_override) {
amd64_printk(KERN_WARNING, "%s", ecc_warning);
return -ENODEV;