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