| Vishal Verma | 6839a6d | 2016-07-23 21:51:21 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NFIT - Machine Check Handler |
| 3 | * |
| 4 | * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of version 2 of the GNU General Public License as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | */ |
| 15 | #include <linux/notifier.h> |
| 16 | #include <linux/acpi.h> |
| 17 | #include <asm/mce.h> |
| 18 | #include "nfit.h" |
| 19 | |
| 20 | static int nfit_handle_mce(struct notifier_block *nb, unsigned long val, |
| 21 | void *data) |
| 22 | { |
| 23 | struct mce *mce = (struct mce *)data; |
| 24 | struct acpi_nfit_desc *acpi_desc; |
| 25 | struct nfit_spa *nfit_spa; |
| 26 | |
| 27 | /* We only care about memory errors */ |
| 28 | if (!(mce->status & MCACOD)) |
| 29 | return NOTIFY_DONE; |
| 30 | |
| 31 | /* |
| 32 | * mce->addr contains the physical addr accessed that caused the |
| 33 | * machine check. We need to walk through the list of NFITs, and see |
| 34 | * if any of them matches that address, and only then start a scrub. |
| 35 | */ |
| 36 | mutex_lock(&acpi_desc_lock); |
| 37 | list_for_each_entry(acpi_desc, &acpi_descs, list) { |
| 38 | struct device *dev = acpi_desc->dev; |
| 39 | int found_match = 0; |
| 40 | |
| 41 | mutex_lock(&acpi_desc->init_mutex); |
| 42 | list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { |
| 43 | struct acpi_nfit_system_address *spa = nfit_spa->spa; |
| 44 | |
| 45 | if (nfit_spa_type(spa) == NFIT_SPA_PM) |
| 46 | continue; |
| 47 | /* find the spa that covers the mce addr */ |
| 48 | if (spa->address > mce->addr) |
| 49 | continue; |
| 50 | if ((spa->address + spa->length - 1) < mce->addr) |
| 51 | continue; |
| 52 | found_match = 1; |
| 53 | dev_dbg(dev, "%s: addr in SPA %d (0x%llx, 0x%llx)\n", |
| 54 | __func__, spa->range_index, spa->address, |
| 55 | spa->length); |
| 56 | /* |
| 57 | * We can break at the first match because we're going |
| 58 | * to rescan all the SPA ranges. There shouldn't be any |
| 59 | * aliasing anyway. |
| 60 | */ |
| 61 | break; |
| 62 | } |
| 63 | mutex_unlock(&acpi_desc->init_mutex); |
| 64 | |
| 65 | /* |
| 66 | * We can ignore an -EBUSY here because if an ARS is already |
| 67 | * in progress, just let that be the last authoritative one |
| 68 | */ |
| 69 | if (found_match) |
| 70 | acpi_nfit_ars_rescan(acpi_desc); |
| 71 | } |
| 72 | |
| 73 | mutex_unlock(&acpi_desc_lock); |
| 74 | return NOTIFY_DONE; |
| 75 | } |
| 76 | |
| 77 | static struct notifier_block nfit_mce_dec = { |
| 78 | .notifier_call = nfit_handle_mce, |
| 79 | }; |
| 80 | |
| 81 | void nfit_mce_register(void) |
| 82 | { |
| 83 | mce_register_decode_chain(&nfit_mce_dec); |
| 84 | } |
| 85 | |
| 86 | void nfit_mce_unregister(void) |
| 87 | { |
| 88 | mce_unregister_decode_chain(&nfit_mce_dec); |
| 89 | } |