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x86/mce: Fix all mce notifiers to update the mce->kflags bitmask

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If the handler took any action to log or deal with the error, set a bit
in mce->kflags so that the default handler on the end of the machine
check chain can see what has been done.

Get rid of NOTIFY_STOP returns. Make the EDAC and dev-mcelog handlers
skip over errors already processed by CEC.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20200214222720.13168-5-tony.luck@intel.com
This commit is contained in:
Tony Luck 2020-02-14 14:27:17 -08:00 committed by Borislav Petkov
parent 1de08dccd3
commit 23ba710a08
10 changed files with 37 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/cpu/mce/core.c
View File

@ -581,8 +581,10 @@ static int uc_decode_notifier(struct notifier_block *nb, unsigned long val,
return NOTIFY_DONE;
pfn = mce->addr >> PAGE_SHIFT;
if (!memory_failure(pfn, 0))
if (!memory_failure(pfn, 0)) {
set_mce_nospec(pfn);
mce->kflags |= MCE_HANDLED_UC;
}
return NOTIFY_OK;
}

5
arch/x86/kernel/cpu/mce/dev-mcelog.c
View File

@ -39,6 +39,9 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val,
struct mce *mce = (struct mce *)data;
unsigned int entry;
if (mce->kflags & MCE_HANDLED_CEC)
return NOTIFY_DONE;
mutex_lock(&mce_chrdev_read_mutex);
entry = mcelog->next;
@ -56,6 +59,7 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val,
memcpy(mcelog->entry + entry, mce, sizeof(struct mce));
mcelog->entry[entry].finished = 1;
mcelog->entry[entry].kflags = 0;
/* wake processes polling /dev/mcelog */
wake_up_interruptible(&mce_chrdev_wait);
@ -63,6 +67,7 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val,
unlock:
mutex_unlock(&mce_chrdev_read_mutex);
mce->kflags |= MCE_HANDLED_MCELOG;
return NOTIFY_OK;
}

5
drivers/acpi/acpi_extlog.c
View File

@ -146,7 +146,7 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
static u32 err_seq;
estatus = extlog_elog_entry_check(cpu, bank);
if (estatus == NULL)
if (estatus == NULL || (mce->kflags & MCE_HANDLED_CEC))
return NOTIFY_DONE;
memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
@ -176,7 +176,8 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
}
out:
return NOTIFY_STOP;
mce->kflags |= MCE_HANDLED_EXTLOG;
return NOTIFY_OK;
}
static bool __init extlog_get_l1addr(void)

1
drivers/acpi/nfit/mce.c
View File

@ -76,6 +76,7 @@ static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
*/
acpi_nfit_ars_rescan(acpi_desc, 0);
}
mce->kflags |= MCE_HANDLED_NFIT;
break;
}

5
drivers/edac/i7core_edac.c
View File

@ -1815,7 +1815,7 @@ static int i7core_mce_check_error(struct notifier_block *nb, unsigned long val,
struct mem_ctl_info *mci;
i7_dev = get_i7core_dev(mce->socketid);
if (!i7_dev)
if (!i7_dev || (mce->kflags & MCE_HANDLED_CEC))
return NOTIFY_DONE;
mci = i7_dev->mci;
@ -1834,7 +1834,8 @@ static int i7core_mce_check_error(struct notifier_block *nb, unsigned long val,
i7core_check_error(mci, mce);
/* Advise mcelog that the errors were handled */
return NOTIFY_STOP;
mce->kflags |= MCE_HANDLED_EDAC;
return NOTIFY_OK;
}
static struct notifier_block i7_mce_dec = {

6
drivers/edac/mce_amd.c
View File

@ -1046,6 +1046,9 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
unsigned int fam = x86_family(m->cpuid);
int ecc;
if (m->kflags & MCE_HANDLED_CEC)
return NOTIFY_DONE;
pr_emerg(HW_ERR "%s\n", decode_error_status(m));
pr_emerg(HW_ERR "CPU:%d (%x:%x:%x) MC%d_STATUS[%s|%s|%s|%s|%s",
@ -1146,7 +1149,8 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
err_code:
amd_decode_err_code(m->status & 0xffff);
return NOTIFY_STOP;
m->kflags |= MCE_HANDLED_EDAC;
return NOTIFY_OK;
}
static struct notifier_block amd_mce_dec_nb = {

5
drivers/edac/pnd2_edac.c
View File

@ -1400,7 +1400,7 @@ static int pnd2_mce_check_error(struct notifier_block *nb, unsigned long val, vo
return NOTIFY_DONE;
mci = pnd2_mci;
if (!mci)
if (!mci || (mce->kflags & MCE_HANDLED_CEC))
return NOTIFY_DONE;
/*
@ -1429,7 +1429,8 @@ static int pnd2_mce_check_error(struct notifier_block *nb, unsigned long val, vo
pnd2_mce_output_error(mci, mce, &daddr);
/* Advice mcelog that the error were handled */
return NOTIFY_STOP;
mce->kflags |= MCE_HANDLED_EDAC;
return NOTIFY_OK;
}
static struct notifier_block pnd2_mce_dec = {

5
drivers/edac/sb_edac.c
View File

@ -3136,6 +3136,8 @@ static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
if (edac_get_report_status() == EDAC_REPORTING_DISABLED)
return NOTIFY_DONE;
if (mce->kflags & MCE_HANDLED_CEC)
return NOTIFY_DONE;
/*
* Just let mcelog handle it if the error is
@ -3183,7 +3185,8 @@ static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
sbridge_mce_output_error(mci, mce);
/* Advice mcelog that the error were handled */
return NOTIFY_STOP;
mce->kflags |= MCE_HANDLED_EDAC;
return NOTIFY_OK;
}
static struct notifier_block sbridge_mce_dec = {

4
drivers/edac/skx_common.c
View File

@ -577,6 +577,9 @@ int skx_mce_check_error(struct notifier_block *nb, unsigned long val,
if (edac_get_report_status() == EDAC_REPORTING_DISABLED)
return NOTIFY_DONE;
if (mce->kflags & MCE_HANDLED_CEC)
return NOTIFY_DONE;
/* ignore unless this is memory related with an address */
if ((mce->status & 0xefff) >> 7 != 1 || !(mce->status & MCI_STATUS_ADDRV))
return NOTIFY_DONE;
@ -616,6 +619,7 @@ int skx_mce_check_error(struct notifier_block *nb, unsigned long val,
skx_mce_output_error(mci, mce, &res);
mce->kflags |= MCE_HANDLED_EDAC;
return NOTIFY_DONE;
}

9
drivers/ras/cec.c
View File

@ -538,9 +538,12 @@ static int cec_notifier(struct notifier_block *nb, unsigned long val,
/* We eat only correctable DRAM errors with usable addresses. */
if (mce_is_memory_error(m) &&
mce_is_correctable(m) &&
mce_usable_address(m))
if (!cec_add_elem(m->addr >> PAGE_SHIFT))
return NOTIFY_STOP;
mce_usable_address(m)) {
if (!cec_add_elem(m->addr >> PAGE_SHIFT)) {
m->kflags |= MCE_HANDLED_CEC;
return NOTIFY_OK;
}
}
return NOTIFY_DONE;
}