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path: root/drivers/acpi/nfit/mce.c
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Diffstat (limited to 'drivers/acpi/nfit/mce.c')
-rw-r--r--drivers/acpi/nfit/mce.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/acpi/nfit/mce.c b/drivers/acpi/nfit/mce.c
new file mode 100644
index 000000000000..4c745bf389fe
--- /dev/null
+++ b/drivers/acpi/nfit/mce.c
@@ -0,0 +1,89 @@
+/*
+ * NFIT - Machine Check Handler
+ *
+ * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
+ *
+ * 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.
+ */
+#include <linux/notifier.h>
+#include <linux/acpi.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 memory errors */
+ if (!(mce->status & MCACOD))
+ 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, "%s: addr in SPA %d (0x%llx, 0x%llx)\n",
+ __func__, 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);
+
+ /*
+ * We can ignore an -EBUSY here because if an ARS is already
+ * in progress, just let that be the last authoritative one
+ */
+ if (found_match)
+ acpi_nfit_ars_rescan(acpi_desc);
+ }
+
+ mutex_unlock(&acpi_desc_lock);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block nfit_mce_dec = {
+ .notifier_call = nfit_handle_mce,
+};
+
+void nfit_mce_register(void)
+{
+ mce_register_decode_chain(&nfit_mce_dec);
+}
+
+void nfit_mce_unregister(void)
+{
+ mce_unregister_decode_chain(&nfit_mce_dec);
+}