[mirror_ubuntu-artful-kernel.git] / drivers / acpi / nfit / mce.c

/*
 * 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 <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 memory errors */
	if (!mce_is_memory_error(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, "%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);

		if (!found_match)
			continue;

		/* If this fails due to an -ENOMEM, there is little we can do */
		nvdimm_bus_add_poison(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);
		}
		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);
}
Commit	Line	Data
6839a6d9 VV	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>
9ffd6350	17	#include <linux/nd.h>
6839a6d9 VV	18	#include <asm/mce.h>
	19	#include "nfit.h"
	20
	21	static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
	22	void *data)
	23	{
	24	struct mce mce = (struct mce )data;
	25	struct acpi_nfit_desc *acpi_desc;
	26	struct nfit_spa *nfit_spa;
	27
	28	/* We only care about memory errors */
fc08a470	29	if (!mce_is_memory_error(mce))
6839a6d9 VV	30	return NOTIFY_DONE;
	31
	32	/*
	33	* mce->addr contains the physical addr accessed that caused the
	34	* machine check. We need to walk through the list of NFITs, and see
	35	* if any of them matches that address, and only then start a scrub.
	36	*/
	37	mutex_lock(&acpi_desc_lock);
	38	list_for_each_entry(acpi_desc, &acpi_descs, list) {
	39	struct device *dev = acpi_desc->dev;
	40	int found_match = 0;
	41
	42	mutex_lock(&acpi_desc->init_mutex);
	43	list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
	44	struct acpi_nfit_system_address *spa = nfit_spa->spa;
	45
2e21807d	46	if (nfit_spa_type(spa) != NFIT_SPA_PM)
6839a6d9 VV	47	continue;
	48	/* find the spa that covers the mce addr */
	49	if (spa->address > mce->addr)
	50	continue;
	51	if ((spa->address + spa->length - 1) < mce->addr)
	52	continue;
	53	found_match = 1;
	54	dev_dbg(dev, "%s: addr in SPA %d (0x%llx, 0x%llx)\n",
	55	__func__, spa->range_index, spa->address,
	56	spa->length);
	57	/*
	58	* We can break at the first match because we're going
	59	* to rescan all the SPA ranges. There shouldn't be any
	60	* aliasing anyway.
	61	*/
	62	break;
	63	}
	64	mutex_unlock(&acpi_desc->init_mutex);
	65
9ffd6350 VV	66	if (!found_match)
	67	continue;
	68
	69	/* If this fails due to an -ENOMEM, there is little we can do */
	70	nvdimm_bus_add_poison(acpi_desc->nvdimm_bus,
	71	ALIGN(mce->addr, L1_CACHE_BYTES),
	72	L1_CACHE_BYTES);
	73	nvdimm_region_notify(nfit_spa->nd_region,
	74	NVDIMM_REVALIDATE_POISON);
	75
	76	if (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON) {
	77	/*
	78	* We can ignore an -EBUSY here because if an ARS is
	79	* already in progress, just let that be the last
	80	* authoritative one
	81	*/
6839a6d9	82	acpi_nfit_ars_rescan(acpi_desc);
9ffd6350 VV	83	}
9ffd6350 VV	84	break;
6839a6d9 VV	85	}
	86
	87	mutex_unlock(&acpi_desc_lock);
	88	return NOTIFY_DONE;
	89	}
	90
	91	static struct notifier_block nfit_mce_dec = {
	92	.notifier_call = nfit_handle_mce,
9026cc82	93	.priority = MCE_PRIO_NFIT,
6839a6d9 VV	94	};
	95
	96	void nfit_mce_register(void)
	97	{
	98	mce_register_decode_chain(&nfit_mce_dec);
	99	}
	100
	101	void nfit_mce_unregister(void)
	102	{
	103	mce_unregister_decode_chain(&nfit_mce_dec);
	104	}