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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 64 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.894819585@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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