[net-next-2.6.git] / drivers / acpi / apei / einj.c

/*
 * APEI Error INJection support
 *
 * EINJ provides a hardware error injection mechanism, this is useful
 * for debugging and testing of other APEI and RAS features.
 *
 * For more information about EINJ, please refer to ACPI Specification
 * version 4.0, section 17.5.
 *
 * Copyright 2009-2010 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/nmi.h>
#include <linux/delay.h>
#include <acpi/acpi.h>

#include "apei-internal.h"

#define EINJ_PFX "EINJ: "

#define SPIN_UNIT		100			/* 100ns */
/* Firmware should respond within 1 miliseconds */
#define FIRMWARE_TIMEOUT	(1 * NSEC_PER_MSEC)

/*
 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
 * EINJ table through an unpublished extension. Use with caution as
 * most will ignore the parameter and make their own choice of address
 * for error injection.
 */
struct einj_parameter {
	u64 type;
	u64 reserved1;
	u64 reserved2;
	u64 param1;
	u64 param2;
};

#define EINJ_OP_BUSY			0x1
#define EINJ_STATUS_SUCCESS		0x0
#define EINJ_STATUS_FAIL		0x1
#define EINJ_STATUS_INVAL		0x2

#define EINJ_TAB_ENTRY(tab)						\
	((struct acpi_whea_header *)((char *)(tab) +			\
				    sizeof(struct acpi_table_einj)))

static struct acpi_table_einj *einj_tab;

static struct apei_resources einj_resources;

static struct apei_exec_ins_type einj_ins_type[] = {
	[ACPI_EINJ_READ_REGISTER] = {
		.flags = APEI_EXEC_INS_ACCESS_REGISTER,
		.run   = apei_exec_read_register,
	},
	[ACPI_EINJ_READ_REGISTER_VALUE] = {
		.flags = APEI_EXEC_INS_ACCESS_REGISTER,
		.run   = apei_exec_read_register_value,
	},
	[ACPI_EINJ_WRITE_REGISTER] = {
		.flags = APEI_EXEC_INS_ACCESS_REGISTER,
		.run   = apei_exec_write_register,
	},
	[ACPI_EINJ_WRITE_REGISTER_VALUE] = {
		.flags = APEI_EXEC_INS_ACCESS_REGISTER,
		.run   = apei_exec_write_register_value,
	},
	[ACPI_EINJ_NOOP] = {
		.flags = 0,
		.run   = apei_exec_noop,
	},
};

/*
 * Prevent EINJ interpreter to run simultaneously, because the
 * corresponding firmware implementation may not work properly when
 * invoked simultaneously.
 */
static DEFINE_MUTEX(einj_mutex);

static struct einj_parameter *einj_param;

static void einj_exec_ctx_init(struct apei_exec_context *ctx)
{
	apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
			   EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
}

static int __einj_get_available_error_type(u32 *type)
{
	struct apei_exec_context ctx;
	int rc;

	einj_exec_ctx_init(&ctx);
	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
	if (rc)
		return rc;
	*type = apei_exec_ctx_get_output(&ctx);

	return 0;
}

/* Get error injection capabilities of the platform */
static int einj_get_available_error_type(u32 *type)
{
	int rc;

	mutex_lock(&einj_mutex);
	rc = __einj_get_available_error_type(type);
	mutex_unlock(&einj_mutex);

	return rc;
}

static int einj_timedout(u64 *t)
{
	if ((s64)*t < SPIN_UNIT) {
		pr_warning(FW_WARN EINJ_PFX
			   "Firmware does not respond in time\n");
		return 1;
	}
	*t -= SPIN_UNIT;
	ndelay(SPIN_UNIT);
	touch_nmi_watchdog();
	return 0;
}

static u64 einj_get_parameter_address(void)
{
	int i;
	u64 paddr = 0;
	struct acpi_whea_header *entry;

	entry = EINJ_TAB_ENTRY(einj_tab);
	for (i = 0; i < einj_tab->entries; i++) {
		if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
		    entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
		    entry->register_region.space_id ==
		    ACPI_ADR_SPACE_SYSTEM_MEMORY)
			memcpy(&paddr, &entry->register_region.address,
			       sizeof(paddr));
		entry++;
	}

	return paddr;
}

/* do sanity check to trigger table */
static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
{
	if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
		return -EINVAL;
	if (trigger_tab->table_size > PAGE_SIZE ||
	    trigger_tab->table_size <= trigger_tab->header_size)
		return -EINVAL;
	if (trigger_tab->entry_count !=
	    (trigger_tab->table_size - trigger_tab->header_size) /
	    sizeof(struct acpi_einj_entry))
		return -EINVAL;

	return 0;
}

/* Execute instructions in trigger error action table */
static int __einj_error_trigger(u64 trigger_paddr)
{
	struct acpi_einj_trigger *trigger_tab = NULL;
	struct apei_exec_context trigger_ctx;
	struct apei_resources trigger_resources;
	struct acpi_whea_header *trigger_entry;
	struct resource *r;
	u32 table_size;
	int rc = -EIO;

	r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
			       "APEI EINJ Trigger Table");
	if (!r) {
		pr_err(EINJ_PFX
	"Can not request iomem region <%016llx-%016llx> for Trigger table.\n",
		       (unsigned long long)trigger_paddr,
		       (unsigned long long)trigger_paddr+sizeof(*trigger_tab));
		goto out;
	}
	trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
	if (!trigger_tab) {
		pr_err(EINJ_PFX "Failed to map trigger table!\n");
		goto out_rel_header;
	}
	rc = einj_check_trigger_header(trigger_tab);
	if (rc) {
		pr_warning(FW_BUG EINJ_PFX
			   "The trigger error action table is invalid\n");
		goto out_rel_header;
	}
	rc = -EIO;
	table_size = trigger_tab->table_size;
	r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
			       table_size - sizeof(*trigger_tab),
			       "APEI EINJ Trigger Table");
	if (!r) {
		pr_err(EINJ_PFX
"Can not request iomem region <%016llx-%016llx> for Trigger Table Entry.\n",
		       (unsigned long long)trigger_paddr+sizeof(*trigger_tab),
		       (unsigned long long)trigger_paddr + table_size);
		goto out_rel_header;
	}
	iounmap(trigger_tab);
	trigger_tab = ioremap_cache(trigger_paddr, table_size);
	if (!trigger_tab) {
		pr_err(EINJ_PFX "Failed to map trigger table!\n");
		goto out_rel_entry;
	}
	trigger_entry = (struct acpi_whea_header *)
		((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
	apei_resources_init(&trigger_resources);
	apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
			   ARRAY_SIZE(einj_ins_type),
			   trigger_entry, trigger_tab->entry_count);
	rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
	if (rc)
		goto out_fini;
	rc = apei_resources_sub(&trigger_resources, &einj_resources);
	if (rc)
		goto out_fini;
	rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
	if (rc)
		goto out_fini;
	rc = apei_exec_pre_map_gars(&trigger_ctx);
	if (rc)
		goto out_release;

	rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);

	apei_exec_post_unmap_gars(&trigger_ctx);
out_release:
	apei_resources_release(&trigger_resources);
out_fini:
	apei_resources_fini(&trigger_resources);
out_rel_entry:
	release_mem_region(trigger_paddr + sizeof(*trigger_tab),
			   table_size - sizeof(*trigger_tab));
out_rel_header:
	release_mem_region(trigger_paddr, sizeof(*trigger_tab));
out:
	if (trigger_tab)
		iounmap(trigger_tab);

	return rc;
}

static int __einj_error_inject(u32 type, u64 param1, u64 param2)
{
	struct apei_exec_context ctx;
	u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
	int rc;

	einj_exec_ctx_init(&ctx);

	rc = apei_exec_run(&ctx, ACPI_EINJ_BEGIN_OPERATION);
	if (rc)
		return rc;
	apei_exec_ctx_set_input(&ctx, type);
	rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
	if (rc)
		return rc;
	if (einj_param) {
		writeq(param1, &einj_param->param1);
		writeq(param2, &einj_param->param2);
	}
	rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
	if (rc)
		return rc;
	for (;;) {
		rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
		if (rc)
			return rc;
		val = apei_exec_ctx_get_output(&ctx);
		if (!(val & EINJ_OP_BUSY))
			break;
		if (einj_timedout(&timeout))
			return -EIO;
	}
	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
	if (rc)
		return rc;
	val = apei_exec_ctx_get_output(&ctx);
	if (val != EINJ_STATUS_SUCCESS)
		return -EBUSY;

	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
	if (rc)
		return rc;
	trigger_paddr = apei_exec_ctx_get_output(&ctx);
	rc = __einj_error_trigger(trigger_paddr);
	if (rc)
		return rc;
	rc = apei_exec_run(&ctx, ACPI_EINJ_END_OPERATION);

	return rc;
}

/* Inject the specified hardware error */
static int einj_error_inject(u32 type, u64 param1, u64 param2)
{
	int rc;

	mutex_lock(&einj_mutex);
	rc = __einj_error_inject(type, param1, param2);
	mutex_unlock(&einj_mutex);

	return rc;
}

static u32 error_type;
static u64 error_param1;
static u64 error_param2;
static struct dentry *einj_debug_dir;

static int available_error_type_show(struct seq_file *m, void *v)
{
	int rc;
	u32 available_error_type = 0;

	rc = einj_get_available_error_type(&available_error_type);
	if (rc)
		return rc;
	if (available_error_type & 0x0001)
		seq_printf(m, "0x00000001\tProcessor Correctable\n");
	if (available_error_type & 0x0002)
		seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
	if (available_error_type & 0x0004)
		seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
	if (available_error_type & 0x0008)
		seq_printf(m, "0x00000008\tMemory Correctable\n");
	if (available_error_type & 0x0010)
		seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
	if (available_error_type & 0x0020)
		seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
	if (available_error_type & 0x0040)
		seq_printf(m, "0x00000040\tPCI Express Correctable\n");
	if (available_error_type & 0x0080)
		seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
	if (available_error_type & 0x0100)
		seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
	if (available_error_type & 0x0200)
		seq_printf(m, "0x00000200\tPlatform Correctable\n");
	if (available_error_type & 0x0400)
		seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
	if (available_error_type & 0x0800)
		seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");

	return 0;
}

static int available_error_type_open(struct inode *inode, struct file *file)
{
	return single_open(file, available_error_type_show, NULL);
}

static const struct file_operations available_error_type_fops = {
	.open		= available_error_type_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int error_type_get(void *data, u64 *val)
{
	*val = error_type;

	return 0;
}

static int error_type_set(void *data, u64 val)
{
	int rc;
	u32 available_error_type = 0;

	/* Only one error type can be specified */
	if (val & (val - 1))
		return -EINVAL;
	rc = einj_get_available_error_type(&available_error_type);
	if (rc)
		return rc;
	if (!(val & available_error_type))
		return -EINVAL;
	error_type = val;

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
			error_type_set, "0x%llx\n");

static int error_inject_set(void *data, u64 val)
{
	if (!error_type)
		return -EINVAL;

	return einj_error_inject(error_type, error_param1, error_param2);
}

DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
			error_inject_set, "%llu\n");

static int einj_check_table(struct acpi_table_einj *einj_tab)
{
	if ((einj_tab->header_length !=
	     (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
	    && (einj_tab->header_length != sizeof(struct acpi_table_einj)))
		return -EINVAL;
	if (einj_tab->header.length < sizeof(struct acpi_table_einj))
		return -EINVAL;
	if (einj_tab->entries !=
	    (einj_tab->header.length - sizeof(struct acpi_table_einj)) /
	    sizeof(struct acpi_einj_entry))
		return -EINVAL;

	return 0;
}

static int __init einj_init(void)
{
	int rc;
	u64 param_paddr;
	acpi_status status;
	struct dentry *fentry;
	struct apei_exec_context ctx;

	if (acpi_disabled)
		return -ENODEV;

	status = acpi_get_table(ACPI_SIG_EINJ, 0,
				(struct acpi_table_header **)&einj_tab);
	if (status == AE_NOT_FOUND) {
		pr_info(EINJ_PFX "Table is not found!\n");
		return -ENODEV;
	} else if (ACPI_FAILURE(status)) {
		const char *msg = acpi_format_exception(status);
		pr_err(EINJ_PFX "Failed to get table, %s\n", msg);
		return -EINVAL;
	}

	rc = einj_check_table(einj_tab);
	if (rc) {
		pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n");
		return -EINVAL;
	}

	rc = -ENOMEM;
	einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
	if (!einj_debug_dir)
		goto err_cleanup;
	fentry = debugfs_create_file("available_error_type", S_IRUSR,
				     einj_debug_dir, NULL,
				     &available_error_type_fops);
	if (!fentry)
		goto err_cleanup;
	fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR,
				     einj_debug_dir, NULL, &error_type_fops);
	if (!fentry)
		goto err_cleanup;
	fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
				    einj_debug_dir, &error_param1);
	if (!fentry)
		goto err_cleanup;
	fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
				    einj_debug_dir, &error_param2);
	if (!fentry)
		goto err_cleanup;
	fentry = debugfs_create_file("error_inject", S_IWUSR,
				     einj_debug_dir, NULL, &error_inject_fops);
	if (!fentry)
		goto err_cleanup;

	apei_resources_init(&einj_resources);
	einj_exec_ctx_init(&ctx);
	rc = apei_exec_collect_resources(&ctx, &einj_resources);
	if (rc)
		goto err_fini;
	rc = apei_resources_request(&einj_resources, "APEI EINJ");
	if (rc)
		goto err_fini;
	rc = apei_exec_pre_map_gars(&ctx);
	if (rc)
		goto err_release;
	param_paddr = einj_get_parameter_address();
	if (param_paddr) {
		einj_param = ioremap(param_paddr, sizeof(*einj_param));
		rc = -ENOMEM;
		if (!einj_param)
			goto err_unmap;
	}

	pr_info(EINJ_PFX "Error INJection is initialized.\n");

	return 0;

err_unmap:
	apei_exec_post_unmap_gars(&ctx);
err_release:
	apei_resources_release(&einj_resources);
err_fini:
	apei_resources_fini(&einj_resources);
err_cleanup:
	debugfs_remove_recursive(einj_debug_dir);

	return rc;
}

static void __exit einj_exit(void)
{
	struct apei_exec_context ctx;

	if (einj_param)
		iounmap(einj_param);
	einj_exec_ctx_init(&ctx);
	apei_exec_post_unmap_gars(&ctx);
	apei_resources_release(&einj_resources);
	apei_resources_fini(&einj_resources);
	debugfs_remove_recursive(einj_debug_dir);
}

module_init(einj_init);
module_exit(einj_exit);

MODULE_AUTHOR("Huang Ying");
MODULE_DESCRIPTION("APEI Error INJection support");
MODULE_LICENSE("GPL");
Commit	Line	Data
e4021345 HY	1	/*
	2	* APEI Error INJection support
	3	*
	4	* EINJ provides a hardware error injection mechanism, this is useful
	5	* for debugging and testing of other APEI and RAS features.
	6	*
	7	* For more information about EINJ, please refer to ACPI Specification
	8	* version 4.0, section 17.5.
	9	*
6e320ec1	10	* Copyright 2009-2010 Intel Corp.
e4021345 HY	11	* Author: Huang Ying <ying.huang@intel.com>
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License version
	15	* 2 as published by the Free Software Foundation.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	25	*/
	26
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/init.h>
	30	#include <linux/io.h>
	31	#include <linux/debugfs.h>
	32	#include <linux/seq_file.h>
	33	#include <linux/nmi.h>
	34	#include <linux/delay.h>
	35	#include <acpi/acpi.h>
	36
	37	#include "apei-internal.h"
	38
	39	#define EINJ_PFX "EINJ: "
	40
	41	#define SPIN_UNIT 100 /* 100ns */
	42	/* Firmware should respond within 1 miliseconds */
	43	#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
	44
6e320ec1 HY	45	/*
	46	* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
	47	* EINJ table through an unpublished extension. Use with caution as
	48	* most will ignore the parameter and make their own choice of address
	49	* for error injection.
	50	*/
	51	struct einj_parameter {
	52	u64 type;
	53	u64 reserved1;
	54	u64 reserved2;
	55	u64 param1;
	56	u64 param2;
	57	};
	58
e4021345 HY	59	#define EINJ_OP_BUSY 0x1
	60	#define EINJ_STATUS_SUCCESS 0x0
	61	#define EINJ_STATUS_FAIL 0x1
	62	#define EINJ_STATUS_INVAL 0x2
	63
	64	#define EINJ_TAB_ENTRY(tab) \
	65	((struct acpi_whea_header )((char )(tab) + \
	66	sizeof(struct acpi_table_einj)))
	67
	68	static struct acpi_table_einj *einj_tab;
	69
	70	static struct apei_resources einj_resources;
	71
	72	static struct apei_exec_ins_type einj_ins_type[] = {
	73	[ACPI_EINJ_READ_REGISTER] = {
	74	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	75	.run = apei_exec_read_register,
	76	},
	77	[ACPI_EINJ_READ_REGISTER_VALUE] = {
	78	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	79	.run = apei_exec_read_register_value,
	80	},
	81	[ACPI_EINJ_WRITE_REGISTER] = {
	82	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	83	.run = apei_exec_write_register,
	84	},
	85	[ACPI_EINJ_WRITE_REGISTER_VALUE] = {
	86	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	87	.run = apei_exec_write_register_value,
	88	},
	89	[ACPI_EINJ_NOOP] = {
	90	.flags = 0,
	91	.run = apei_exec_noop,
	92	},
	93	};
	94
	95	/*
	96	* Prevent EINJ interpreter to run simultaneously, because the
	97	* corresponding firmware implementation may not work properly when
	98	* invoked simultaneously.
	99	*/
	100	static DEFINE_MUTEX(einj_mutex);
	101
6e320ec1 HY	102	static struct einj_parameter *einj_param;
6e320ec1 HY	103
e4021345 HY	104	static void einj_exec_ctx_init(struct apei_exec_context *ctx)
	105	{
	106	apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
	107	EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
	108	}
	109
	110	static int __einj_get_available_error_type(u32 *type)
	111	{
	112	struct apei_exec_context ctx;
	113	int rc;
	114
	115	einj_exec_ctx_init(&ctx);
	116	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
	117	if (rc)
	118	return rc;
	119	*type = apei_exec_ctx_get_output(&ctx);
	120
	121	return 0;
	122	}
	123
	124	/* Get error injection capabilities of the platform */
	125	static int einj_get_available_error_type(u32 *type)
	126	{
	127	int rc;
	128
	129	mutex_lock(&einj_mutex);
	130	rc = __einj_get_available_error_type(type);
	131	mutex_unlock(&einj_mutex);
	132
	133	return rc;
	134	}
	135
	136	static int einj_timedout(u64 *t)
	137	{
	138	if ((s64)*t < SPIN_UNIT) {
	139	pr_warning(FW_WARN EINJ_PFX
	140	"Firmware does not respond in time\n");
	141	return 1;
	142	}
	143	*t -= SPIN_UNIT;
	144	ndelay(SPIN_UNIT);
	145	touch_nmi_watchdog();
	146	return 0;
	147	}
	148
6e320ec1 HY	149	static u64 einj_get_parameter_address(void)
	150	{
	151	int i;
	152	u64 paddr = 0;
	153	struct acpi_whea_header *entry;
	154
	155	entry = EINJ_TAB_ENTRY(einj_tab);
	156	for (i = 0; i < einj_tab->entries; i++) {
	157	if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
	158	entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
	159	entry->register_region.space_id ==
	160	ACPI_ADR_SPACE_SYSTEM_MEMORY)
	161	memcpy(&paddr, &entry->register_region.address,
	162	sizeof(paddr));
	163	entry++;
	164	}
	165
	166	return paddr;
	167	}
	168
e4021345 HY	169	/* do sanity check to trigger table */
	170	static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
	171	{
	172	if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
	173	return -EINVAL;
	174	if (trigger_tab->table_size > PAGE_SIZE \|\|
	175	trigger_tab->table_size <= trigger_tab->header_size)
	176	return -EINVAL;
	177	if (trigger_tab->entry_count !=
	178	(trigger_tab->table_size - trigger_tab->header_size) /
	179	sizeof(struct acpi_einj_entry))
	180	return -EINVAL;
	181
	182	return 0;
	183	}
	184
	185	/* Execute instructions in trigger error action table */
	186	static int __einj_error_trigger(u64 trigger_paddr)
	187	{
	188	struct acpi_einj_trigger *trigger_tab = NULL;
	189	struct apei_exec_context trigger_ctx;
	190	struct apei_resources trigger_resources;
	191	struct acpi_whea_header *trigger_entry;
	192	struct resource *r;
	193	u32 table_size;
	194	int rc = -EIO;
	195
	196	r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
	197	"APEI EINJ Trigger Table");
	198	if (!r) {
	199	pr_err(EINJ_PFX
	200	"Can not request iomem region <%016llx-%016llx> for Trigger table.\n",
	201	(unsigned long long)trigger_paddr,
	202	(unsigned long long)trigger_paddr+sizeof(*trigger_tab));
	203	goto out;
	204	}
	205	trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
	206	if (!trigger_tab) {
	207	pr_err(EINJ_PFX "Failed to map trigger table!\n");
	208	goto out_rel_header;
	209	}
	210	rc = einj_check_trigger_header(trigger_tab);
	211	if (rc) {
	212	pr_warning(FW_BUG EINJ_PFX
	213	"The trigger error action table is invalid\n");
	214	goto out_rel_header;
	215	}
	216	rc = -EIO;
	217	table_size = trigger_tab->table_size;
	218	r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
	219	table_size - sizeof(*trigger_tab),
	220	"APEI EINJ Trigger Table");
	221	if (!r) {
	222	pr_err(EINJ_PFX
	223	"Can not request iomem region <%016llx-%016llx> for Trigger Table Entry.\n",
	224	(unsigned long long)trigger_paddr+sizeof(*trigger_tab),
	225	(unsigned long long)trigger_paddr + table_size);
	226	goto out_rel_header;
	227	}
	228	iounmap(trigger_tab);
	229	trigger_tab = ioremap_cache(trigger_paddr, table_size);
	230	if (!trigger_tab) {
	231	pr_err(EINJ_PFX "Failed to map trigger table!\n");
	232	goto out_rel_entry;
233	}
234	trigger_entry = (struct acpi_whea_header *)
235	((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
236	apei_resources_init(&trigger_resources);
237	apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
238	ARRAY_SIZE(einj_ins_type),
239	trigger_entry, trigger_tab->entry_count);
240	rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
241	if (rc)
242	goto out_fini;
243	rc = apei_resources_sub(&trigger_resources, &einj_resources);
244	if (rc)
245	goto out_fini;
246	rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
247	if (rc)
248	goto out_fini;
249	rc = apei_exec_pre_map_gars(&trigger_ctx);
250	if (rc)
251	goto out_release;
252
253	rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
254
255	apei_exec_post_unmap_gars(&trigger_ctx);
256	out_release:
257	apei_resources_release(&trigger_resources);
258	out_fini:
259	apei_resources_fini(&trigger_resources);
260	out_rel_entry:
261	release_mem_region(trigger_paddr + sizeof(*trigger_tab),
262	table_size - sizeof(*trigger_tab));
263	out_rel_header:
264	release_mem_region(trigger_paddr, sizeof(*trigger_tab));
265	out:
266	if (trigger_tab)
267	iounmap(trigger_tab);
268
269	return rc;
270	}
271
6e320ec1	272	static int __einj_error_inject(u32 type, u64 param1, u64 param2)
e4021345 HY	273	{
	274	struct apei_exec_context ctx;
	275	u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
	276	int rc;
	277
	278	einj_exec_ctx_init(&ctx);
	279
	280	rc = apei_exec_run(&ctx, ACPI_EINJ_BEGIN_OPERATION);
	281	if (rc)
	282	return rc;
	283	apei_exec_ctx_set_input(&ctx, type);
	284	rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
	285	if (rc)
	286	return rc;
6e320ec1 HY	287	if (einj_param) {
	288	writeq(param1, &einj_param->param1);
	289	writeq(param2, &einj_param->param2);
	290	}
e4021345 HY	291	rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
	292	if (rc)
	293	return rc;
	294	for (;;) {
	295	rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
	296	if (rc)
	297	return rc;
	298	val = apei_exec_ctx_get_output(&ctx);
	299	if (!(val & EINJ_OP_BUSY))
	300	break;
	301	if (einj_timedout(&timeout))
	302	return -EIO;
	303	}
	304	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
	305	if (rc)
	306	return rc;
	307	val = apei_exec_ctx_get_output(&ctx);
	308	if (val != EINJ_STATUS_SUCCESS)
	309	return -EBUSY;
	310
	311	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
	312	if (rc)
	313	return rc;
	314	trigger_paddr = apei_exec_ctx_get_output(&ctx);
	315	rc = __einj_error_trigger(trigger_paddr);
	316	if (rc)
	317	return rc;
	318	rc = apei_exec_run(&ctx, ACPI_EINJ_END_OPERATION);
	319
	320	return rc;
	321	}
	322
	323	/* Inject the specified hardware error */
6e320ec1	324	static int einj_error_inject(u32 type, u64 param1, u64 param2)
e4021345 HY	325	{
	326	int rc;
	327
	328	mutex_lock(&einj_mutex);
6e320ec1	329	rc = __einj_error_inject(type, param1, param2);
e4021345 HY	330	mutex_unlock(&einj_mutex);
	331
	332	return rc;
	333	}
	334
	335	static u32 error_type;
6e320ec1 HY	336	static u64 error_param1;
6e320ec1 HY	337	static u64 error_param2;
e4021345 HY	338	static struct dentry *einj_debug_dir;
	339
	340	static int available_error_type_show(struct seq_file m, void v)
	341	{
	342	int rc;
	343	u32 available_error_type = 0;
	344
	345	rc = einj_get_available_error_type(&available_error_type);
	346	if (rc)
	347	return rc;
	348	if (available_error_type & 0x0001)
	349	seq_printf(m, "0x00000001\tProcessor Correctable\n");
	350	if (available_error_type & 0x0002)
	351	seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
	352	if (available_error_type & 0x0004)
	353	seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
	354	if (available_error_type & 0x0008)
	355	seq_printf(m, "0x00000008\tMemory Correctable\n");
	356	if (available_error_type & 0x0010)
	357	seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
	358	if (available_error_type & 0x0020)
	359	seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
	360	if (available_error_type & 0x0040)
	361	seq_printf(m, "0x00000040\tPCI Express Correctable\n");
	362	if (available_error_type & 0x0080)
	363	seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
	364	if (available_error_type & 0x0100)
	365	seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
	366	if (available_error_type & 0x0200)
	367	seq_printf(m, "0x00000200\tPlatform Correctable\n");
	368	if (available_error_type & 0x0400)
	369	seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
	370	if (available_error_type & 0x0800)
	371	seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
	372
	373	return 0;
	374	}
	375
	376	static int available_error_type_open(struct inode inode, struct file file)
	377	{
	378	return single_open(file, available_error_type_show, NULL);
	379	}
	380
	381	static const struct file_operations available_error_type_fops = {
	382	.open = available_error_type_open,
	383	.read = seq_read,
	384	.llseek = seq_lseek,
	385	.release = single_release,
	386	};
	387
	388	static int error_type_get(void data, u64 val)
	389	{
	390	*val = error_type;
	391
	392	return 0;
	393	}
	394
	395	static int error_type_set(void *data, u64 val)
	396	{
	397	int rc;
	398	u32 available_error_type = 0;
	399
	400	/* Only one error type can be specified */
	401	if (val & (val - 1))
402	return -EINVAL;
403	rc = einj_get_available_error_type(&available_error_type);
404	if (rc)
405	return rc;
406	if (!(val & available_error_type))
407	return -EINVAL;
408	error_type = val;
409
410	return 0;
411	}
412
413	DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
414	error_type_set, "0x%llx\n");
415
416	static int error_inject_set(void *data, u64 val)
417	{
418	if (!error_type)
419	return -EINVAL;
420
6e320ec1	421	return einj_error_inject(error_type, error_param1, error_param2);
e4021345 HY	422	}
	423
	424	DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
	425	error_inject_set, "%llu\n");
	426
	427	static int einj_check_table(struct acpi_table_einj *einj_tab)
	428	{
3a78f965 HY	429	if ((einj_tab->header_length !=
	430	(sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
	431	&& (einj_tab->header_length != sizeof(struct acpi_table_einj)))
e4021345 HY	432	return -EINVAL;
	433	if (einj_tab->header.length < sizeof(struct acpi_table_einj))
	434	return -EINVAL;
	435	if (einj_tab->entries !=
	436	(einj_tab->header.length - sizeof(struct acpi_table_einj)) /
	437	sizeof(struct acpi_einj_entry))
	438	return -EINVAL;
	439
	440	return 0;
	441	}
	442
	443	static int __init einj_init(void)
	444	{
	445	int rc;
6e320ec1	446	u64 param_paddr;
e4021345 HY	447	acpi_status status;
	448	struct dentry *fentry;
	449	struct apei_exec_context ctx;
	450
	451	if (acpi_disabled)
	452	return -ENODEV;
	453
	454	status = acpi_get_table(ACPI_SIG_EINJ, 0,
	455	(struct acpi_table_header **)&einj_tab);
	456	if (status == AE_NOT_FOUND) {
	457	pr_info(EINJ_PFX "Table is not found!\n");
	458	return -ENODEV;
	459	} else if (ACPI_FAILURE(status)) {
	460	const char *msg = acpi_format_exception(status);
	461	pr_err(EINJ_PFX "Failed to get table, %s\n", msg);
	462	return -EINVAL;
	463	}
	464
	465	rc = einj_check_table(einj_tab);
	466	if (rc) {
	467	pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n");
	468	return -EINVAL;
	469	}
	470
	471	rc = -ENOMEM;
	472	einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
	473	if (!einj_debug_dir)
	474	goto err_cleanup;
	475	fentry = debugfs_create_file("available_error_type", S_IRUSR,
	476	einj_debug_dir, NULL,
	477	&available_error_type_fops);
	478	if (!fentry)
	479	goto err_cleanup;
	480	fentry = debugfs_create_file("error_type", S_IRUSR \| S_IWUSR,
	481	einj_debug_dir, NULL, &error_type_fops);
	482	if (!fentry)
	483	goto err_cleanup;
6e320ec1 HY	484	fentry = debugfs_create_x64("param1", S_IRUSR \| S_IWUSR,
	485	einj_debug_dir, &error_param1);
	486	if (!fentry)
	487	goto err_cleanup;
	488	fentry = debugfs_create_x64("param2", S_IRUSR \| S_IWUSR,
	489	einj_debug_dir, &error_param2);
	490	if (!fentry)
	491	goto err_cleanup;
e4021345 HY	492	fentry = debugfs_create_file("error_inject", S_IWUSR,
	493	einj_debug_dir, NULL, &error_inject_fops);
	494	if (!fentry)
	495	goto err_cleanup;
	496
	497	apei_resources_init(&einj_resources);
	498	einj_exec_ctx_init(&ctx);
	499	rc = apei_exec_collect_resources(&ctx, &einj_resources);
	500	if (rc)
	501	goto err_fini;
	502	rc = apei_resources_request(&einj_resources, "APEI EINJ");
	503	if (rc)
	504	goto err_fini;
	505	rc = apei_exec_pre_map_gars(&ctx);
	506	if (rc)
	507	goto err_release;
6e320ec1 HY	508	param_paddr = einj_get_parameter_address();
	509	if (param_paddr) {
	510	einj_param = ioremap(param_paddr, sizeof(*einj_param));
	511	rc = -ENOMEM;
	512	if (!einj_param)
	513	goto err_unmap;
	514	}
e4021345 HY	515
	516	pr_info(EINJ_PFX "Error INJection is initialized.\n");
	517
	518	return 0;
	519
6e320ec1 HY	520	err_unmap:
6e320ec1 HY	521	apei_exec_post_unmap_gars(&ctx);
e4021345 HY	522	err_release:
	523	apei_resources_release(&einj_resources);
	524	err_fini:
	525	apei_resources_fini(&einj_resources);
	526	err_cleanup:
	527	debugfs_remove_recursive(einj_debug_dir);
	528
	529	return rc;
	530	}
	531
	532	static void __exit einj_exit(void)
	533	{
	534	struct apei_exec_context ctx;
	535
6e320ec1 HY	536	if (einj_param)
6e320ec1 HY	537	iounmap(einj_param);
e4021345 HY	538	einj_exec_ctx_init(&ctx);
	539	apei_exec_post_unmap_gars(&ctx);
	540	apei_resources_release(&einj_resources);
	541	apei_resources_fini(&einj_resources);
	542	debugfs_remove_recursive(einj_debug_dir);
	543	}
	544
	545	module_init(einj_init);
	546	module_exit(einj_exit);
	547
	548	MODULE_AUTHOR("Huang Ying");
	549	MODULE_DESCRIPTION("APEI Error INJection support");
	550	MODULE_LICENSE("GPL");