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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * NFIT - Machine Check Handler
- *
- * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
- */
- #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 uncorrectable memory errors */
- if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
- return NOTIFY_DONE;
- /* Verify the address reported in the MCE is valid. */
- if (!mce_usable_address(mce))
- 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, "addr in SPA %d (0x%llx, 0x%llx)\n",
- 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_badrange(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, 0);
- }
- mce->kflags |= MCE_HANDLED_NFIT;
- break;
- }
- mutex_unlock(&acpi_desc_lock);
- return NOTIFY_DONE;
- }
- static struct notifier_block nfit_mce_dec = {
- .notifier_call = nfit_handle_mce,
- .priority = MCE_PRIO_NFIT,
- };
- 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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