drivers/acpi/apei/hest.c - linux - Git at Google

 /*
  * APEI Hardware Error Souce Table support
  *
  * HEST describes error sources in detail; communicates operational
  * parameters (i.e. severity levels, masking bits, and threshold
  * values) to Linux as necessary. It also allows the BIOS to report
  * non-standard error sources to Linux (for example, chipset-specific
  * error registers).
  *
  * For more information about HEST, please refer to ACPI Specification
  * version 4.0, section 17.3.2.
  *
  * Copyright 2009 Intel Corp.
  *   Author: Huang Ying <ying.huang@intel.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version
  * 2 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/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/kdebug.h>
 #include <linux/highmem.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <acpi/apei.h>
 #include <acpi/ghes.h>

 #include "apei-internal.h"

 #define HEST_PFX "HEST: "

 int hest_disable;
 EXPORT_SYMBOL_GPL(hest_disable);

 /* HEST table parsing */

 static struct acpi_table_hest *__read_mostly hest_tab;

 static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
 	[ACPI_HEST_TYPE_IA32_CHECK] = -1,	/* need further calculation */
 	[ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
 	[ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
 	[ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
 	[ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
 	[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
 	[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
 	[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
 	[ACPI_HEST_TYPE_IA32_DEFERRED_CHECK] = -1,
 };

 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
 {
 	u16 hest_type = hest_hdr->type;
 	int len;

 	if (hest_type >= ACPI_HEST_TYPE_RESERVED)
 		return 0;

 	len = hest_esrc_len_tab[hest_type];

 	if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
 		struct acpi_hest_ia_corrected *cmc;
 		cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
 		len = sizeof(*cmc) + cmc->num_hardware_banks *
 			sizeof(struct acpi_hest_ia_error_bank);
 	} else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
 		struct acpi_hest_ia_machine_check *mc;
 		mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
 		len = sizeof(*mc) + mc->num_hardware_banks *
 			sizeof(struct acpi_hest_ia_error_bank);
 	} else if (hest_type == ACPI_HEST_TYPE_IA32_DEFERRED_CHECK) {
 		struct acpi_hest_ia_deferred_check *mc;
 		mc = (struct acpi_hest_ia_deferred_check *)hest_hdr;
 		len = sizeof(*mc) + mc->num_hardware_banks *
 			sizeof(struct acpi_hest_ia_error_bank);
 	}
 	BUG_ON(len == -1);

 	return len;
 };

 int apei_hest_parse(apei_hest_func_t func, void *data)
 {
 	struct acpi_hest_header *hest_hdr;
 	int i, rc, len;

 	if (hest_disable || !hest_tab)
 		return -EINVAL;

 	hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
 	for (i = 0; i < hest_tab->error_source_count; i++) {
 		len = hest_esrc_len(hest_hdr);
 		if (!len) {
 			pr_warning(FW_WARN HEST_PFX
 				   "Unknown or unused hardware error source "
 				   "type: %d for hardware error source: %d.\n",
 				   hest_hdr->type, hest_hdr->source_id);
 			return -EINVAL;
 		}
 		if ((void *)hest_hdr + len >
 		    (void *)hest_tab + hest_tab->header.length) {
 			pr_warning(FW_BUG HEST_PFX
 		"Table contents overflow for hardware error source: %d.\n",
 				hest_hdr->source_id);
 			return -EINVAL;
 		}

 		rc = func(hest_hdr, data);
 		if (rc)
 			return rc;

 		hest_hdr = (void *)hest_hdr + len;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(apei_hest_parse);

 /*
  * Check if firmware advertises firmware first mode. We need FF bit to be set
  * along with a set of MC banks which work in FF mode.
  */
 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
 {
 	if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
 		return 0;

 	if (!acpi_disable_cmcff)
 		return !arch_apei_enable_cmcff(hest_hdr, data);

 	return 0;
 }

 struct ghes_arr {
 	struct platform_device **ghes_devs;
 	unsigned int count;
 };

 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
 {
 	int *count = data;

 	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
 	    hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		(*count)++;
 	return 0;
 }

 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
 {
 	struct platform_device *ghes_dev;
 	struct ghes_arr *ghes_arr = data;
 	int rc, i;

 	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
 	    hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		return 0;

 	if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
 		return 0;
 	for (i = 0; i < ghes_arr->count; i++) {
 		struct acpi_hest_header *hdr;
 		ghes_dev = ghes_arr->ghes_devs[i];
 		hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
 		if (hdr->source_id == hest_hdr->source_id) {
 			pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
 				   hdr->source_id);
 			return -EIO;
 		}
 	}
 	ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
 	if (!ghes_dev)
 		return -ENOMEM;

 	rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
 	if (rc)
 		goto err;

 	rc = platform_device_add(ghes_dev);
 	if (rc)
 		goto err;
 	ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;

 	return 0;
 err:
 	platform_device_put(ghes_dev);
 	return rc;
 }

 static int __init hest_ghes_dev_register(unsigned int ghes_count)
 {
 	int rc, i;
 	struct ghes_arr ghes_arr;

 	ghes_arr.count = 0;
 	ghes_arr.ghes_devs = kmalloc_array(ghes_count, sizeof(void *),
 					   GFP_KERNEL);
 	if (!ghes_arr.ghes_devs)
 		return -ENOMEM;

 	rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
 	if (rc)
 		goto err;

 	rc = ghes_estatus_pool_init();
 	if (rc)
 		goto err;

 out:
 	kfree(ghes_arr.ghes_devs);
 	return rc;
 err:
 	for (i = 0; i < ghes_arr.count; i++)
 		platform_device_unregister(ghes_arr.ghes_devs[i]);
 	goto out;
 }

 static int __init setup_hest_disable(char *str)
 {
 	hest_disable = HEST_DISABLED;
 	return 0;
 }

 __setup("hest_disable", setup_hest_disable);

 void __init acpi_hest_init(void)
 {
 	acpi_status status;
 	int rc = -ENODEV;
 	unsigned int ghes_count = 0;

 	if (hest_disable) {
 		pr_info(HEST_PFX "Table parsing disabled.\n");
 		return;
 	}

 	status = acpi_get_table(ACPI_SIG_HEST, 0,
 				(struct acpi_table_header **)&hest_tab);
 	if (status == AE_NOT_FOUND) {
 		hest_disable = HEST_NOT_FOUND;
 		return;
 	} else if (ACPI_FAILURE(status)) {
 		const char *msg = acpi_format_exception(status);
 		pr_err(HEST_PFX "Failed to get table, %s\n", msg);
 		rc = -EINVAL;
 		goto err;
 	}

 	rc = apei_hest_parse(hest_parse_cmc, NULL);
 	if (rc)
 		goto err;

 	if (!ghes_disable) {
 		rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
 		if (rc)
 			goto err;

 		if (ghes_count)
 			rc = hest_ghes_dev_register(ghes_count);
 		if (rc)
 			goto err;
 	}

 	pr_info(HEST_PFX "Table parsing has been initialized.\n");
 	return;
 err:
 	hest_disable = HEST_DISABLED;
 }
	/*
	* APEI Hardware Error Souce Table support
	*
	* HEST describes error sources in detail; communicates operational
	* parameters (i.e. severity levels, masking bits, and threshold
	* values) to Linux as necessary. It also allows the BIOS to report
	* non-standard error sources to Linux (for example, chipset-specific
	* error registers).
	*
	* For more information about HEST, please refer to ACPI Specification
	* version 4.0, section 17.3.2.
	*
	* Copyright 2009 Intel Corp.
	* Author: Huang Ying <ying.huang@intel.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version
	* 2 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/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/acpi.h>
	#include <linux/kdebug.h>
	#include <linux/highmem.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <acpi/apei.h>
	#include <acpi/ghes.h>

	#include "apei-internal.h"

	#define HEST_PFX "HEST: "

	int hest_disable;
	EXPORT_SYMBOL_GPL(hest_disable);

	/* HEST table parsing */

	static struct acpi_table_hest *__read_mostly hest_tab;

	static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
	[ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */
	[ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
	[ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
	[ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
	[ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
	[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
	[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
	[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
	[ACPI_HEST_TYPE_IA32_DEFERRED_CHECK] = -1,
	};

	static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
	{
	u16 hest_type = hest_hdr->type;
	int len;

	if (hest_type >= ACPI_HEST_TYPE_RESERVED)
	return 0;

	len = hest_esrc_len_tab[hest_type];

	if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
	struct acpi_hest_ia_corrected *cmc;
	cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
	len = sizeof(cmc) + cmc->num_hardware_banks
	sizeof(struct acpi_hest_ia_error_bank);
	} else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
	struct acpi_hest_ia_machine_check *mc;
	mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
	len = sizeof(mc) + mc->num_hardware_banks
	sizeof(struct acpi_hest_ia_error_bank);
	} else if (hest_type == ACPI_HEST_TYPE_IA32_DEFERRED_CHECK) {
	struct acpi_hest_ia_deferred_check *mc;
	mc = (struct acpi_hest_ia_deferred_check *)hest_hdr;
	len = sizeof(mc) + mc->num_hardware_banks
	sizeof(struct acpi_hest_ia_error_bank);
	}
	BUG_ON(len == -1);

	return len;
	};

	int apei_hest_parse(apei_hest_func_t func, void *data)
	{
	struct acpi_hest_header *hest_hdr;
	int i, rc, len;

	if (hest_disable \|\| !hest_tab)
	return -EINVAL;

	hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
	for (i = 0; i < hest_tab->error_source_count; i++) {
	len = hest_esrc_len(hest_hdr);
	if (!len) {
	pr_warning(FW_WARN HEST_PFX
	"Unknown or unused hardware error source "
	"type: %d for hardware error source: %d.\n",
	hest_hdr->type, hest_hdr->source_id);
	return -EINVAL;
	}
	if ((void *)hest_hdr + len >
	(void *)hest_tab + hest_tab->header.length) {
	pr_warning(FW_BUG HEST_PFX
	"Table contents overflow for hardware error source: %d.\n",
	hest_hdr->source_id);
	return -EINVAL;
	}

	rc = func(hest_hdr, data);
	if (rc)
	return rc;

	hest_hdr = (void *)hest_hdr + len;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(apei_hest_parse);

	/*
	* Check if firmware advertises firmware first mode. We need FF bit to be set
	* along with a set of MC banks which work in FF mode.
	*/
	static int __init hest_parse_cmc(struct acpi_hest_header hest_hdr, void data)
	{
	if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
	return 0;

	if (!acpi_disable_cmcff)
	return !arch_apei_enable_cmcff(hest_hdr, data);

	return 0;
	}

	struct ghes_arr {
	struct platform_device **ghes_devs;
	unsigned int count;
	};

	static int __init hest_parse_ghes_count(struct acpi_hest_header hest_hdr, void data)
	{
	int *count = data;

	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR \|\|
	hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
	(*count)++;
	return 0;
	}

	static int __init hest_parse_ghes(struct acpi_hest_header hest_hdr, void data)
	{
	struct platform_device *ghes_dev;
	struct ghes_arr *ghes_arr = data;
	int rc, i;

	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
	hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
	return 0;

	if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
	return 0;
	for (i = 0; i < ghes_arr->count; i++) {
	struct acpi_hest_header *hdr;
	ghes_dev = ghes_arr->ghes_devs[i];
	hdr = (struct acpi_hest_header *)ghes_dev->dev.platform_data;
	if (hdr->source_id == hest_hdr->source_id) {
	pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
	hdr->source_id);
	return -EIO;
	}
	}
	ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
	if (!ghes_dev)
	return -ENOMEM;

	rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
	if (rc)
	goto err;

	rc = platform_device_add(ghes_dev);
	if (rc)
	goto err;
	ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;

	return 0;
	err:
	platform_device_put(ghes_dev);
	return rc;
	}

	static int __init hest_ghes_dev_register(unsigned int ghes_count)
	{
	int rc, i;
	struct ghes_arr ghes_arr;

	ghes_arr.count = 0;
	ghes_arr.ghes_devs = kmalloc_array(ghes_count, sizeof(void *),
	GFP_KERNEL);
	if (!ghes_arr.ghes_devs)
	return -ENOMEM;

	rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
	if (rc)
	goto err;

	rc = ghes_estatus_pool_init();
	if (rc)
	goto err;

	out:
	kfree(ghes_arr.ghes_devs);
	return rc;
	err:
	for (i = 0; i < ghes_arr.count; i++)
	platform_device_unregister(ghes_arr.ghes_devs[i]);
	goto out;
	}

	static int __init setup_hest_disable(char *str)
	{
	hest_disable = HEST_DISABLED;
	return 0;
	}

	__setup("hest_disable", setup_hest_disable);

	void __init acpi_hest_init(void)
	{
	acpi_status status;
	int rc = -ENODEV;
	unsigned int ghes_count = 0;

	if (hest_disable) {
	pr_info(HEST_PFX "Table parsing disabled.\n");
	return;
	}

	status = acpi_get_table(ACPI_SIG_HEST, 0,
	(struct acpi_table_header **)&hest_tab);
	if (status == AE_NOT_FOUND) {
	hest_disable = HEST_NOT_FOUND;
	return;
	} else if (ACPI_FAILURE(status)) {
	const char *msg = acpi_format_exception(status);
	pr_err(HEST_PFX "Failed to get table, %s\n", msg);
	rc = -EINVAL;
	goto err;
	}

	rc = apei_hest_parse(hest_parse_cmc, NULL);
	if (rc)
	goto err;

	if (!ghes_disable) {
	rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
	if (rc)
	goto err;

	if (ghes_count)
	rc = hest_ghes_dev_register(ghes_count);
	if (rc)
	goto err;
	}

	pr_info(HEST_PFX "Table parsing has been initialized.\n");
	return;
	err:
	hest_disable = HEST_DISABLED;
	}