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/*
* 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);
}
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