104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
|
|
* NFIT - Machine Check Handler
|
|
*
|
|
* Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*/
|
|
#include <linux/notifier.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/nd.h>
|
|
#include <asm/mce.h>
|
|
#include "nfit.h"
|
|
|
|
static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
|
|
void *data)
|
|
{
|
|
struct mce *mce = (struct mce *)data;
|
|
struct acpi_nfit_desc *acpi_desc;
|
|
struct nfit_spa *nfit_spa;
|
|
|
|
/* We only care about memory errors */
|
|
if (!(mce->status & MCACOD))
|
|
return NOTIFY_DONE;
|
|
|
|
/*
|
|
* mce->addr contains the physical addr accessed that caused the
|
|
* machine check. We need to walk through the list of NFITs, and see
|
|
* if any of them matches that address, and only then start a scrub.
|
|
*/
|
|
mutex_lock(&acpi_desc_lock);
|
|
list_for_each_entry(acpi_desc, &acpi_descs, list) {
|
|
struct device *dev = acpi_desc->dev;
|
|
int found_match = 0;
|
|
|
|
mutex_lock(&acpi_desc->init_mutex);
|
|
list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
|
|
struct acpi_nfit_system_address *spa = nfit_spa->spa;
|
|
|
|
if (nfit_spa_type(spa) != NFIT_SPA_PM)
|
|
continue;
|
|
/* find the spa that covers the mce addr */
|
|
if (spa->address > mce->addr)
|
|
continue;
|
|
if ((spa->address + spa->length - 1) < mce->addr)
|
|
continue;
|
|
found_match = 1;
|
|
dev_dbg(dev, "%s: addr in SPA %d (0x%llx, 0x%llx)\n",
|
|
__func__, spa->range_index, spa->address,
|
|
spa->length);
|
|
/*
|
|
* We can break at the first match because we're going
|
|
* to rescan all the SPA ranges. There shouldn't be any
|
|
* aliasing anyway.
|
|
*/
|
|
break;
|
|
}
|
|
mutex_unlock(&acpi_desc->init_mutex);
|
|
|
|
if (!found_match)
|
|
continue;
|
|
|
|
/* If this fails due to an -ENOMEM, there is little we can do */
|
|
nvdimm_bus_add_poison(acpi_desc->nvdimm_bus,
|
|
ALIGN(mce->addr, L1_CACHE_BYTES),
|
|
L1_CACHE_BYTES);
|
|
nvdimm_region_notify(nfit_spa->nd_region,
|
|
NVDIMM_REVALIDATE_POISON);
|
|
|
|
if (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON) {
|
|
/*
|
|
* We can ignore an -EBUSY here because if an ARS is
|
|
* already in progress, just let that be the last
|
|
* authoritative one
|
|
*/
|
|
acpi_nfit_ars_rescan(acpi_desc);
|
|
}
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&acpi_desc_lock);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block nfit_mce_dec = {
|
|
.notifier_call = nfit_handle_mce,
|
|
};
|
|
|
|
void nfit_mce_register(void)
|
|
{
|
|
mce_register_decode_chain(&nfit_mce_dec);
|
|
}
|
|
|
|
void nfit_mce_unregister(void)
|
|
{
|
|
mce_unregister_decode_chain(&nfit_mce_dec);
|
|
}
|