101 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * NFIT - Machine Check Handler4 *5 * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.6 */7#include <linux/notifier.h>8#include <linux/acpi.h>9#include <linux/nd.h>10#include <asm/mce.h>11#include "nfit.h"12 13static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,14 void *data)15{16 struct mce *mce = (struct mce *)data;17 struct acpi_nfit_desc *acpi_desc;18 struct nfit_spa *nfit_spa;19 20 /* We only care about uncorrectable memory errors */21 if (!mce_is_memory_error(mce) || mce_is_correctable(mce))22 return NOTIFY_DONE;23 24 /* Verify the address reported in the MCE is valid. */25 if (!mce_usable_address(mce))26 return NOTIFY_DONE;27 28 /*29 * mce->addr contains the physical addr accessed that caused the30 * machine check. We need to walk through the list of NFITs, and see31 * if any of them matches that address, and only then start a scrub.32 */33 mutex_lock(&acpi_desc_lock);34 list_for_each_entry(acpi_desc, &acpi_descs, list) {35 unsigned int align = 1UL << MCI_MISC_ADDR_LSB(mce->misc);36 struct device *dev = acpi_desc->dev;37 int found_match = 0;38 39 mutex_lock(&acpi_desc->init_mutex);40 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {41 struct acpi_nfit_system_address *spa = nfit_spa->spa;42 43 if (nfit_spa_type(spa) != NFIT_SPA_PM)44 continue;45 /* find the spa that covers the mce addr */46 if (spa->address > mce->addr)47 continue;48 if ((spa->address + spa->length - 1) < mce->addr)49 continue;50 found_match = 1;51 dev_dbg(dev, "addr in SPA %d (0x%llx, 0x%llx)\n",52 spa->range_index, spa->address, spa->length);53 /*54 * We can break at the first match because we're going55 * to rescan all the SPA ranges. There shouldn't be any56 * aliasing anyway.57 */58 break;59 }60 mutex_unlock(&acpi_desc->init_mutex);61 62 if (!found_match)63 continue;64 65 /* If this fails due to an -ENOMEM, there is little we can do */66 nvdimm_bus_add_badrange(acpi_desc->nvdimm_bus,67 ALIGN_DOWN(mce->addr, align), align);68 nvdimm_region_notify(nfit_spa->nd_region,69 NVDIMM_REVALIDATE_POISON);70 71 if (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON) {72 /*73 * We can ignore an -EBUSY here because if an ARS is74 * already in progress, just let that be the last75 * authoritative one76 */77 acpi_nfit_ars_rescan(acpi_desc, 0);78 }79 mce->kflags |= MCE_HANDLED_NFIT;80 break;81 }82 83 mutex_unlock(&acpi_desc_lock);84 return NOTIFY_DONE;85}86 87static struct notifier_block nfit_mce_dec = {88 .notifier_call = nfit_handle_mce,89 .priority = MCE_PRIO_NFIT,90};91 92void nfit_mce_register(void)93{94 mce_register_decode_chain(&nfit_mce_dec);95}96 97void nfit_mce_unregister(void)98{99 mce_unregister_decode_chain(&nfit_mce_dec);100}101