[deliverable/linux.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 milliseconds */
#define FIRMWARE_TIMEOUT	(1 * NSEC_PER_MSEC)

/*
 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
 */
static int acpi5;

struct set_error_type_with_address {
	u32	type;
	u32	vendor_extension;
	u32	flags;
	u32	apicid;
	u64	memory_address;
	u64	memory_address_range;
	u32	pcie_sbdf;
};
enum {
	SETWA_FLAGS_APICID = 1,
	SETWA_FLAGS_MEM = 2,
	SETWA_FLAGS_PCIE_SBDF = 4,
};

/*
 * Vendor extensions for platform specific operations
 */
struct vendor_error_type_extension {
	u32	length;
	u32	pcie_sbdf;
	u16	vendor_id;
	u16	device_id;
	u8	rev_id;
	u8	reserved[3];
};

static u32 vendor_flags;
static struct debugfs_blob_wrapper vendor_blob;
static char vendor_dev[64];

/*
 * 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 * EINJ table through an unpublished extension.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.  This extension is used only if
 * param_extension module parameter is specified.
 */
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 bool param_extension;
module_param(param_extension, bool, 0);

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 void *einj_param;

#ifndef readq
static inline __u64 readq(volatile void __iomem *addr)
{
	return ((__u64)readl(addr+4) << 32) + readl(addr);
}
#endif

#ifndef writeq
static inline void writeq(__u64 val, volatile void __iomem *addr)
{
	writel(val, addr);
	writel(val >> 32, addr+4);
}
#endif

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 void check_vendor_extension(u64 paddr,
				   struct set_error_type_with_address *v5param)
{
	int	offset = readl(&v5param->vendor_extension);
	struct	vendor_error_type_extension *v;
	u32	sbdf;

	if (!offset)
		return;
	v = ioremap(paddr + offset, sizeof(*v));
	if (!v)
		return;
	sbdf = readl(&v->pcie_sbdf);
	sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
		sbdf >> 24, (sbdf >> 16) & 0xff,
		(sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
		 readw(&v->vendor_id), readw(&v->device_id),
		readb(&v->rev_id));
	iounmap(v);
}

static void *einj_get_parameter_address(void)
{
	int i;
	u64 paddrv4 = 0, paddrv5 = 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(&paddrv4, &entry->register_region.address,
			       sizeof(paddrv4));
		if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
		    entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
		    entry->register_region.space_id ==
		    ACPI_ADR_SPACE_SYSTEM_MEMORY)
			memcpy(&paddrv5, &entry->register_region.address,
			       sizeof(paddrv5));
		entry++;
	}
	if (paddrv5) {
		struct set_error_type_with_address *v5param;

		v5param = ioremap(paddrv5, sizeof(*v5param));
		if (v5param) {
			acpi5 = 1;
			check_vendor_extension(paddrv5, v5param);
			return v5param;
		}
	}
	if (paddrv4) {
		struct einj_parameter *v4param;

		v4param = ioremap(paddrv4, sizeof(*v4param));
		if (!v4param)
			return 0;
		if (readq(&v4param->reserved1) || readq(&v4param->reserved2)) {
			iounmap(v4param);
			return 0;
		}
		return v4param;
	}

	return 0;
}

/* 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_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
	if (rc)
		return rc;
	apei_exec_ctx_set_input(&ctx, type);
	if (acpi5) {
		struct set_error_type_with_address *v5param = einj_param;

		writel(type, &v5param->type);
		if (type & 0x80000000) {
			switch (vendor_flags) {
			case SETWA_FLAGS_APICID:
				writel(param1, &v5param->apicid);
				break;
			case SETWA_FLAGS_MEM:
				writeq(param1, &v5param->memory_address);
				writeq(param2, &v5param->memory_address_range);
				break;
			case SETWA_FLAGS_PCIE_SBDF:
				writel(param1, &v5param->pcie_sbdf);
				break;
			}
			writel(vendor_flags, &v5param->flags);
		} else {
			switch (type) {
			case ACPI_EINJ_PROCESSOR_CORRECTABLE:
			case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
			case ACPI_EINJ_PROCESSOR_FATAL:
				writel(param1, &v5param->apicid);
				writel(SETWA_FLAGS_APICID, &v5param->flags);
				break;
			case ACPI_EINJ_MEMORY_CORRECTABLE:
			case ACPI_EINJ_MEMORY_UNCORRECTABLE:
			case ACPI_EINJ_MEMORY_FATAL:
				writeq(param1, &v5param->memory_address);
				writeq(param2, &v5param->memory_address_range);
				writel(SETWA_FLAGS_MEM, &v5param->flags);
				break;
			case ACPI_EINJ_PCIX_CORRECTABLE:
			case ACPI_EINJ_PCIX_UNCORRECTABLE:
			case ACPI_EINJ_PCIX_FATAL:
				writel(param1, &v5param->pcie_sbdf);
				writel(SETWA_FLAGS_PCIE_SBDF, &v5param->flags);
				break;
			}
		}
	} else {
		rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
		if (rc)
			return rc;
		if (einj_param) {
			struct einj_parameter *v4param = einj_param;
			writeq(param1, &v4param->param1);
			writeq(param2, &v4param->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_optional(&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;
	u32 tval, vendor;

	/*
	 * Vendor defined types have 0x80000000 bit set, and
	 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
	 */
	vendor = val & 0x80000000;
	tval = val & 0x7fffffff;

	/* Only one error type can be specified */
	if (tval & (tval - 1))
		return -EINVAL;
	if (!vendor) {
		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;
	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_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;

	einj_param = einj_get_parameter_address();
	if ((param_extension || acpi5) && einj_param) {
		fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
					    einj_debug_dir, &error_param1);
		if (!fentry)
			goto err_unmap;
		fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
					    einj_debug_dir, &error_param2);
		if (!fentry)
			goto err_unmap;
	}

	if (vendor_dev[0]) {
		vendor_blob.data = vendor_dev;
		vendor_blob.size = strlen(vendor_dev);
		fentry = debugfs_create_blob("vendor", S_IRUSR,
					     einj_debug_dir, &vendor_blob);
		if (!fentry)
			goto err_unmap;
		fentry = debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
					    einj_debug_dir, &vendor_flags);
		if (!fentry)
			goto err_unmap;
	}

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

	return 0;

err_unmap:
	if (einj_param)
		iounmap(einj_param);
	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 */
e8a8b252	42	/* Firmware should respond within 1 milliseconds */
e4021345 HY	43	#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
e4021345 HY	44
c130bd6f TL	45	/*
	46	* ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
	47	*/
	48	static int acpi5;
	49
	50	struct set_error_type_with_address {
	51	u32 type;
	52	u32 vendor_extension;
	53	u32 flags;
	54	u32 apicid;
	55	u64 memory_address;
	56	u64 memory_address_range;
	57	u32 pcie_sbdf;
	58	};
	59	enum {
	60	SETWA_FLAGS_APICID = 1,
	61	SETWA_FLAGS_MEM = 2,
	62	SETWA_FLAGS_PCIE_SBDF = 4,
	63	};
	64
	65	/*
	66	* Vendor extensions for platform specific operations
	67	*/
	68	struct vendor_error_type_extension {
	69	u32 length;
	70	u32 pcie_sbdf;
	71	u16 vendor_id;
	72	u16 device_id;
	73	u8 rev_id;
	74	u8 reserved[3];
	75	};
	76
	77	static u32 vendor_flags;
	78	static struct debugfs_blob_wrapper vendor_blob;
	79	static char vendor_dev[64];
	80
6e320ec1 HY	81	/*
	82	* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
	83	* EINJ table through an unpublished extension. Use with caution as
	84	* most will ignore the parameter and make their own choice of address
c3e6088e HY	85	* for error injection. This extension is used only if
c3e6088e HY	86	* param_extension module parameter is specified.
6e320ec1 HY	87	*/
	88	struct einj_parameter {
	89	u64 type;
	90	u64 reserved1;
	91	u64 reserved2;
	92	u64 param1;
	93	u64 param2;
	94	};
	95
e4021345 HY	96	#define EINJ_OP_BUSY 0x1
	97	#define EINJ_STATUS_SUCCESS 0x0
	98	#define EINJ_STATUS_FAIL 0x1
	99	#define EINJ_STATUS_INVAL 0x2
	100
	101	#define EINJ_TAB_ENTRY(tab) \
	102	((struct acpi_whea_header )((char )(tab) + \
	103	sizeof(struct acpi_table_einj)))
	104
c3e6088e HY	105	static bool param_extension;
	106	module_param(param_extension, bool, 0);
	107
e4021345 HY	108	static struct acpi_table_einj *einj_tab;
	109
	110	static struct apei_resources einj_resources;
	111
	112	static struct apei_exec_ins_type einj_ins_type[] = {
	113	[ACPI_EINJ_READ_REGISTER] = {
	114	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	115	.run = apei_exec_read_register,
	116	},
	117	[ACPI_EINJ_READ_REGISTER_VALUE] = {
	118	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	119	.run = apei_exec_read_register_value,
	120	},
	121	[ACPI_EINJ_WRITE_REGISTER] = {
	122	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	123	.run = apei_exec_write_register,
	124	},
	125	[ACPI_EINJ_WRITE_REGISTER_VALUE] = {
	126	.flags = APEI_EXEC_INS_ACCESS_REGISTER,
	127	.run = apei_exec_write_register_value,
	128	},
	129	[ACPI_EINJ_NOOP] = {
	130	.flags = 0,
	131	.run = apei_exec_noop,
	132	},
	133	};
	134
	135	/*
	136	* Prevent EINJ interpreter to run simultaneously, because the
	137	* corresponding firmware implementation may not work properly when
	138	* invoked simultaneously.
	139	*/
	140	static DEFINE_MUTEX(einj_mutex);
	141
c130bd6f TL	142	static void *einj_param;
	143
	144	#ifndef readq
	145	static inline __u64 readq(volatile void __iomem *addr)
	146	{
	147	return ((__u64)readl(addr+4) << 32) + readl(addr);
	148	}
	149	#endif
6e320ec1	150
dbee8a0a RD	151	#ifndef writeq
	152	static inline void writeq(__u64 val, volatile void __iomem *addr)
	153	{
	154	writel(val, addr);
	155	writel(val >> 32, addr+4);
	156	}
	157	#endif
	158
e4021345 HY	159	static void einj_exec_ctx_init(struct apei_exec_context *ctx)
	160	{
	161	apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
	162	EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
	163	}
	164
	165	static int __einj_get_available_error_type(u32 *type)
	166	{
	167	struct apei_exec_context ctx;
	168	int rc;
	169
	170	einj_exec_ctx_init(&ctx);
	171	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
	172	if (rc)
	173	return rc;
	174	*type = apei_exec_ctx_get_output(&ctx);
	175
	176	return 0;
	177	}
	178
	179	/* Get error injection capabilities of the platform */
	180	static int einj_get_available_error_type(u32 *type)
	181	{
	182	int rc;
	183
	184	mutex_lock(&einj_mutex);
	185	rc = __einj_get_available_error_type(type);
	186	mutex_unlock(&einj_mutex);
	187
	188	return rc;
	189	}
	190
	191	static int einj_timedout(u64 *t)
	192	{
	193	if ((s64)*t < SPIN_UNIT) {
	194	pr_warning(FW_WARN EINJ_PFX
	195	"Firmware does not respond in time\n");
	196	return 1;
	197	}
	198	*t -= SPIN_UNIT;
	199	ndelay(SPIN_UNIT);
	200	touch_nmi_watchdog();
	201	return 0;
	202	}
	203
c130bd6f TL	204	static void check_vendor_extension(u64 paddr,
	205	struct set_error_type_with_address *v5param)
	206	{
	207	int offset = readl(&v5param->vendor_extension);
	208	struct vendor_error_type_extension *v;
	209	u32 sbdf;
	210
	211	if (!offset)
	212	return;
	213	v = ioremap(paddr + offset, sizeof(*v));
	214	if (!v)
	215	return;
	216	sbdf = readl(&v->pcie_sbdf);
	217	sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
	218	sbdf >> 24, (sbdf >> 16) & 0xff,
	219	(sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
	220	readw(&v->vendor_id), readw(&v->device_id),
	221	readb(&v->rev_id));
	222	iounmap(v);
	223	}
	224
	225	static void *einj_get_parameter_address(void)
6e320ec1 HY	226	{
6e320ec1 HY	227	int i;
c130bd6f	228	u64 paddrv4 = 0, paddrv5 = 0;
6e320ec1 HY	229	struct acpi_whea_header *entry;
	230
	231	entry = EINJ_TAB_ENTRY(einj_tab);
	232	for (i = 0; i < einj_tab->entries; i++) {
	233	if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
	234	entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
	235	entry->register_region.space_id ==
	236	ACPI_ADR_SPACE_SYSTEM_MEMORY)
c130bd6f TL	237	memcpy(&paddrv4, &entry->register_region.address,
	238	sizeof(paddrv4));
	239	if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
	240	entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
	241	entry->register_region.space_id ==
	242	ACPI_ADR_SPACE_SYSTEM_MEMORY)
	243	memcpy(&paddrv5, &entry->register_region.address,
	244	sizeof(paddrv5));
6e320ec1 HY	245	entry++;
6e320ec1 HY	246	}
c130bd6f TL	247	if (paddrv5) {
	248	struct set_error_type_with_address *v5param;
	249
	250	v5param = ioremap(paddrv5, sizeof(*v5param));
	251	if (v5param) {
	252	acpi5 = 1;
	253	check_vendor_extension(paddrv5, v5param);
	254	return v5param;
	255	}
	256	}
	257	if (paddrv4) {
	258	struct einj_parameter *v4param;
	259
	260	v4param = ioremap(paddrv4, sizeof(*v4param));
	261	if (!v4param)
	262	return 0;
	263	if (readq(&v4param->reserved1) \|\| readq(&v4param->reserved2)) {
	264	iounmap(v4param);
	265	return 0;
	266	}
	267	return v4param;
	268	}
6e320ec1	269
c130bd6f	270	return 0;
6e320ec1 HY	271	}
6e320ec1 HY	272
e4021345 HY	273	/* do sanity check to trigger table */
	274	static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
	275	{
	276	if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
	277	return -EINVAL;
	278	if (trigger_tab->table_size > PAGE_SIZE \|\|
	279	trigger_tab->table_size <= trigger_tab->header_size)
	280	return -EINVAL;
	281	if (trigger_tab->entry_count !=
	282	(trigger_tab->table_size - trigger_tab->header_size) /
	283	sizeof(struct acpi_einj_entry))
	284	return -EINVAL;
	285
	286	return 0;
	287	}
	288
	289	/* Execute instructions in trigger error action table */
	290	static int __einj_error_trigger(u64 trigger_paddr)
	291	{
	292	struct acpi_einj_trigger *trigger_tab = NULL;
	293	struct apei_exec_context trigger_ctx;
	294	struct apei_resources trigger_resources;
	295	struct acpi_whea_header *trigger_entry;
	296	struct resource *r;
	297	u32 table_size;
	298	int rc = -EIO;
	299
	300	r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
	301	"APEI EINJ Trigger Table");
	302	if (!r) {
	303	pr_err(EINJ_PFX
	304	"Can not request iomem region <%016llx-%016llx> for Trigger table.\n",
	305	(unsigned long long)trigger_paddr,
	306	(unsigned long long)trigger_paddr+sizeof(*trigger_tab));
	307	goto out;
	308	}
	309	trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
	310	if (!trigger_tab) {
	311	pr_err(EINJ_PFX "Failed to map trigger table!\n");
	312	goto out_rel_header;
	313	}
	314	rc = einj_check_trigger_header(trigger_tab);
	315	if (rc) {
	316	pr_warning(FW_BUG EINJ_PFX
	317	"The trigger error action table is invalid\n");
	318	goto out_rel_header;
	319	}
	320	rc = -EIO;
	321	table_size = trigger_tab->table_size;
	322	r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
	323	table_size - sizeof(*trigger_tab),
	324	"APEI EINJ Trigger Table");
	325	if (!r) {
	326	pr_err(EINJ_PFX
	327	"Can not request iomem region <%016llx-%016llx> for Trigger Table Entry.\n",
	328	(unsigned long long)trigger_paddr+sizeof(*trigger_tab),
	329	(unsigned long long)trigger_paddr + table_size);
	330	goto out_rel_header;
	331	}
	332	iounmap(trigger_tab);
	333	trigger_tab = ioremap_cache(trigger_paddr, table_size);
	334	if (!trigger_tab) {
	335	pr_err(EINJ_PFX "Failed to map trigger table!\n");
	336	goto out_rel_entry;
337	}
338	trigger_entry = (struct acpi_whea_header *)
339	((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
340	apei_resources_init(&trigger_resources);
341	apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
342	ARRAY_SIZE(einj_ins_type),
343	trigger_entry, trigger_tab->entry_count);
344	rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
345	if (rc)
346	goto out_fini;
347	rc = apei_resources_sub(&trigger_resources, &einj_resources);
348	if (rc)
349	goto out_fini;
350	rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
351	if (rc)
352	goto out_fini;
353	rc = apei_exec_pre_map_gars(&trigger_ctx);
354	if (rc)
355	goto out_release;
356
357	rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
358
359	apei_exec_post_unmap_gars(&trigger_ctx);
360	out_release:
361	apei_resources_release(&trigger_resources);
362	out_fini:
363	apei_resources_fini(&trigger_resources);
364	out_rel_entry:
365	release_mem_region(trigger_paddr + sizeof(*trigger_tab),
366	table_size - sizeof(*trigger_tab));
367	out_rel_header:
368	release_mem_region(trigger_paddr, sizeof(*trigger_tab));
369	out:
370	if (trigger_tab)
371	iounmap(trigger_tab);
372
373	return rc;
374	}
375
6e320ec1	376	static int __einj_error_inject(u32 type, u64 param1, u64 param2)
e4021345 HY	377	{
	378	struct apei_exec_context ctx;
	379	u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
	380	int rc;
	381
	382	einj_exec_ctx_init(&ctx);
	383
392913de	384	rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
e4021345 HY	385	if (rc)
	386	return rc;
	387	apei_exec_ctx_set_input(&ctx, type);
c130bd6f TL	388	if (acpi5) {
	389	struct set_error_type_with_address *v5param = einj_param;
	390
	391	writel(type, &v5param->type);
	392	if (type & 0x80000000) {
	393	switch (vendor_flags) {
	394	case SETWA_FLAGS_APICID:
	395	writel(param1, &v5param->apicid);
	396	break;
	397	case SETWA_FLAGS_MEM:
	398	writeq(param1, &v5param->memory_address);
	399	writeq(param2, &v5param->memory_address_range);
	400	break;
	401	case SETWA_FLAGS_PCIE_SBDF:
	402	writel(param1, &v5param->pcie_sbdf);
	403	break;
	404	}
	405	writel(vendor_flags, &v5param->flags);
	406	} else {
	407	switch (type) {
	408	case ACPI_EINJ_PROCESSOR_CORRECTABLE:
	409	case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
	410	case ACPI_EINJ_PROCESSOR_FATAL:
	411	writel(param1, &v5param->apicid);
	412	writel(SETWA_FLAGS_APICID, &v5param->flags);
	413	break;
	414	case ACPI_EINJ_MEMORY_CORRECTABLE:
	415	case ACPI_EINJ_MEMORY_UNCORRECTABLE:
	416	case ACPI_EINJ_MEMORY_FATAL:
	417	writeq(param1, &v5param->memory_address);
	418	writeq(param2, &v5param->memory_address_range);
	419	writel(SETWA_FLAGS_MEM, &v5param->flags);
	420	break;
	421	case ACPI_EINJ_PCIX_CORRECTABLE:
	422	case ACPI_EINJ_PCIX_UNCORRECTABLE:
	423	case ACPI_EINJ_PCIX_FATAL:
	424	writel(param1, &v5param->pcie_sbdf);
	425	writel(SETWA_FLAGS_PCIE_SBDF, &v5param->flags);
	426	break;
	427	}
	428	}
	429	} else {
	430	rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
	431	if (rc)
	432	return rc;
	433	if (einj_param) {
	434	struct einj_parameter *v4param = einj_param;
	435	writeq(param1, &v4param->param1);
	436	writeq(param2, &v4param->param2);
	437	}
6e320ec1	438	}
e4021345 HY	439	rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
	440	if (rc)
	441	return rc;
	442	for (;;) {
	443	rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
	444	if (rc)
	445	return rc;
	446	val = apei_exec_ctx_get_output(&ctx);
	447	if (!(val & EINJ_OP_BUSY))
	448	break;
	449	if (einj_timedout(&timeout))
	450	return -EIO;
	451	}
	452	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
	453	if (rc)
	454	return rc;
	455	val = apei_exec_ctx_get_output(&ctx);
	456	if (val != EINJ_STATUS_SUCCESS)
	457	return -EBUSY;
	458
	459	rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
	460	if (rc)
	461	return rc;
	462	trigger_paddr = apei_exec_ctx_get_output(&ctx);
	463	rc = __einj_error_trigger(trigger_paddr);
	464	if (rc)
	465	return rc;
392913de	466	rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
e4021345 HY	467
	468	return rc;
	469	}
	470
	471	/* Inject the specified hardware error */
6e320ec1	472	static int einj_error_inject(u32 type, u64 param1, u64 param2)
e4021345 HY	473	{
	474	int rc;
	475
	476	mutex_lock(&einj_mutex);
6e320ec1	477	rc = __einj_error_inject(type, param1, param2);
e4021345 HY	478	mutex_unlock(&einj_mutex);
	479
	480	return rc;
	481	}
	482
	483	static u32 error_type;
6e320ec1 HY	484	static u64 error_param1;
6e320ec1 HY	485	static u64 error_param2;
e4021345 HY	486	static struct dentry *einj_debug_dir;
	487
	488	static int available_error_type_show(struct seq_file m, void v)
	489	{
	490	int rc;
	491	u32 available_error_type = 0;
	492
	493	rc = einj_get_available_error_type(&available_error_type);
	494	if (rc)
	495	return rc;
	496	if (available_error_type & 0x0001)
	497	seq_printf(m, "0x00000001\tProcessor Correctable\n");
	498	if (available_error_type & 0x0002)
	499	seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
	500	if (available_error_type & 0x0004)
	501	seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
	502	if (available_error_type & 0x0008)
	503	seq_printf(m, "0x00000008\tMemory Correctable\n");
	504	if (available_error_type & 0x0010)
	505	seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
	506	if (available_error_type & 0x0020)
	507	seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
	508	if (available_error_type & 0x0040)
	509	seq_printf(m, "0x00000040\tPCI Express Correctable\n");
	510	if (available_error_type & 0x0080)
	511	seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
	512	if (available_error_type & 0x0100)
	513	seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
	514	if (available_error_type & 0x0200)
	515	seq_printf(m, "0x00000200\tPlatform Correctable\n");
	516	if (available_error_type & 0x0400)
	517	seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
	518	if (available_error_type & 0x0800)
	519	seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
	520
	521	return 0;
	522	}
	523
	524	static int available_error_type_open(struct inode inode, struct file file)
	525	{
	526	return single_open(file, available_error_type_show, NULL);
	527	}
	528
	529	static const struct file_operations available_error_type_fops = {
	530	.open = available_error_type_open,
	531	.read = seq_read,
	532	.llseek = seq_lseek,
	533	.release = single_release,
	534	};
	535
	536	static int error_type_get(void data, u64 val)
	537	{
	538	*val = error_type;
	539
	540	return 0;
	541	}
	542
	543	static int error_type_set(void *data, u64 val)
	544	{
	545	int rc;
	546	u32 available_error_type = 0;
c130bd6f TL	547	u32 tval, vendor;
	548
	549	/*
	550	* Vendor defined types have 0x80000000 bit set, and
	551	* are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
	552	*/
	553	vendor = val & 0x80000000;
	554	tval = val & 0x7fffffff;
e4021345 HY	555
e4021345 HY	556	/* Only one error type can be specified */
c130bd6f	557	if (tval & (tval - 1))
e4021345	558	return -EINVAL;
c130bd6f TL	559	if (!vendor) {
	560	rc = einj_get_available_error_type(&available_error_type);
	561	if (rc)
	562	return rc;
	563	if (!(val & available_error_type))
	564	return -EINVAL;
	565	}
e4021345 HY	566	error_type = val;
	567
	568	return 0;
	569	}
	570
	571	DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
	572	error_type_set, "0x%llx\n");
	573
	574	static int error_inject_set(void *data, u64 val)
	575	{
	576	if (!error_type)
	577	return -EINVAL;
	578
6e320ec1	579	return einj_error_inject(error_type, error_param1, error_param2);
e4021345 HY	580	}
	581
	582	DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
	583	error_inject_set, "%llu\n");
	584
	585	static int einj_check_table(struct acpi_table_einj *einj_tab)
	586	{
3a78f965 HY	587	if ((einj_tab->header_length !=
	588	(sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
	589	&& (einj_tab->header_length != sizeof(struct acpi_table_einj)))
e4021345 HY	590	return -EINVAL;
	591	if (einj_tab->header.length < sizeof(struct acpi_table_einj))
	592	return -EINVAL;
	593	if (einj_tab->entries !=
	594	(einj_tab->header.length - sizeof(struct acpi_table_einj)) /
	595	sizeof(struct acpi_einj_entry))
	596	return -EINVAL;
	597
	598	return 0;
	599	}
	600
	601	static int __init einj_init(void)
	602	{
	603	int rc;
	604	acpi_status status;
	605	struct dentry *fentry;
	606	struct apei_exec_context ctx;
	607
	608	if (acpi_disabled)
	609	return -ENODEV;
	610
	611	status = acpi_get_table(ACPI_SIG_EINJ, 0,
	612	(struct acpi_table_header **)&einj_tab);
	613	if (status == AE_NOT_FOUND) {
	614	pr_info(EINJ_PFX "Table is not found!\n");
	615	return -ENODEV;
	616	} else if (ACPI_FAILURE(status)) {
	617	const char *msg = acpi_format_exception(status);
	618	pr_err(EINJ_PFX "Failed to get table, %s\n", msg);
	619	return -EINVAL;
	620	}
	621
	622	rc = einj_check_table(einj_tab);
	623	if (rc) {
	624	pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n");
	625	return -EINVAL;
	626	}
	627
	628	rc = -ENOMEM;
	629	einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
	630	if (!einj_debug_dir)
	631	goto err_cleanup;
	632	fentry = debugfs_create_file("available_error_type", S_IRUSR,
	633	einj_debug_dir, NULL,
	634	&available_error_type_fops);
	635	if (!fentry)
	636	goto err_cleanup;
	637	fentry = debugfs_create_file("error_type", S_IRUSR \| S_IWUSR,
	638	einj_debug_dir, NULL, &error_type_fops);
	639	if (!fentry)
	640	goto err_cleanup;
	641	fentry = debugfs_create_file("error_inject", S_IWUSR,
	642	einj_debug_dir, NULL, &error_inject_fops);
	643	if (!fentry)
	644	goto err_cleanup;
	645
	646	apei_resources_init(&einj_resources);
	647	einj_exec_ctx_init(&ctx);
	648	rc = apei_exec_collect_resources(&ctx, &einj_resources);
	649	if (rc)
	650	goto err_fini;
	651	rc = apei_resources_request(&einj_resources, "APEI EINJ");
	652	if (rc)
	653	goto err_fini;
654	rc = apei_exec_pre_map_gars(&ctx);
655	if (rc)
656	goto err_release;
c130bd6f TL	657
	658	einj_param = einj_get_parameter_address();
	659	if ((param_extension \|\| acpi5) && einj_param) {
	660	fentry = debugfs_create_x64("param1", S_IRUSR \| S_IWUSR,
	661	einj_debug_dir, &error_param1);
	662	if (!fentry)
	663	goto err_unmap;
	664	fentry = debugfs_create_x64("param2", S_IRUSR \| S_IWUSR,
	665	einj_debug_dir, &error_param2);
	666	if (!fentry)
	667	goto err_unmap;
	668	}
	669
	670	if (vendor_dev[0]) {
	671	vendor_blob.data = vendor_dev;
	672	vendor_blob.size = strlen(vendor_dev);
	673	fentry = debugfs_create_blob("vendor", S_IRUSR,
	674	einj_debug_dir, &vendor_blob);
	675	if (!fentry)
	676	goto err_unmap;
	677	fentry = debugfs_create_x32("vendor_flags", S_IRUSR \| S_IWUSR,
	678	einj_debug_dir, &vendor_flags);
	679	if (!fentry)
	680	goto err_unmap;
6e320ec1	681	}
e4021345 HY	682
	683	pr_info(EINJ_PFX "Error INJection is initialized.\n");
	684
	685	return 0;
	686
6e320ec1	687	err_unmap:
c3e6088e HY	688	if (einj_param)
c3e6088e HY	689	iounmap(einj_param);
6e320ec1	690	apei_exec_post_unmap_gars(&ctx);
e4021345 HY	691	err_release:
	692	apei_resources_release(&einj_resources);
	693	err_fini:
	694	apei_resources_fini(&einj_resources);
	695	err_cleanup:
	696	debugfs_remove_recursive(einj_debug_dir);
	697
	698	return rc;
	699	}
	700
	701	static void __exit einj_exit(void)
	702	{
	703	struct apei_exec_context ctx;
	704
6e320ec1 HY	705	if (einj_param)
6e320ec1 HY	706	iounmap(einj_param);
e4021345 HY	707	einj_exec_ctx_init(&ctx);
	708	apei_exec_post_unmap_gars(&ctx);
	709	apei_resources_release(&einj_resources);
	710	apei_resources_fini(&einj_resources);
	711	debugfs_remove_recursive(einj_debug_dir);
	712	}
	713
	714	module_init(einj_init);
	715	module_exit(einj_exit);
	716
	717	MODULE_AUTHOR("Huang Ying");
	718	MODULE_DESCRIPTION("APEI Error INJection support");
	719	MODULE_LICENSE("GPL");