[mirror_ubuntu-hirsute-kernel.git] / drivers / acpi / acpi_configfs.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ACPI configfs support
 *
 * Copyright (c) 2016 Intel Corporation
 */

#define pr_fmt(fmt) "ACPI configfs: " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/configfs.h>
#include <linux/acpi.h>
#include <linux/security.h>

#include "acpica/accommon.h"
#include "acpica/actables.h"

static struct config_group *acpi_table_group;

struct acpi_table {
	struct config_item cfg;
	struct acpi_table_header *header;
	u32 index;
};

static ssize_t acpi_table_aml_write(struct config_item *cfg,
				    const void *data, size_t size)
{
	const struct acpi_table_header *header = data;
	struct acpi_table *table;
	int ret = security_locked_down(LOCKDOWN_ACPI_TABLES);

	if (ret)
		return ret;

	table = container_of(cfg, struct acpi_table, cfg);

	if (table->header) {
		pr_err("table already loaded\n");
		return -EBUSY;
	}

	if (header->length != size) {
		pr_err("invalid table length\n");
		return -EINVAL;
	}

	if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
		pr_err("invalid table signature\n");
		return -EINVAL;
	}

	table = container_of(cfg, struct acpi_table, cfg);

	table->header = kmemdup(header, header->length, GFP_KERNEL);
	if (!table->header)
		return -ENOMEM;

	ret = acpi_load_table(table->header, &table->index);
	if (ret) {
		kfree(table->header);
		table->header = NULL;
	}

	return ret;
}

static inline struct acpi_table_header *get_header(struct config_item *cfg)
{
	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);

	if (!table->header)
		pr_err("table not loaded\n");

	return table->header;
}

static ssize_t acpi_table_aml_read(struct config_item *cfg,
				   void *data, size_t size)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	if (data)
		memcpy(data, h, h->length);

	return h->length;
}

#define MAX_ACPI_TABLE_SIZE (128 * 1024)

CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);

static struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
	&acpi_table_attr_aml,
	NULL,
};

static ssize_t acpi_table_signature_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_NAMESEG_SIZE, h->signature);
}

static ssize_t acpi_table_length_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->length);
}

static ssize_t acpi_table_revision_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->revision);
}

static ssize_t acpi_table_oem_id_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
}

static ssize_t acpi_table_oem_table_id_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
}

static ssize_t acpi_table_oem_revision_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->oem_revision);
}

static ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg,
					       char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_NAMESEG_SIZE, h->asl_compiler_id);
}

static ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
						     char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->asl_compiler_revision);
}

CONFIGFS_ATTR_RO(acpi_table_, signature);
CONFIGFS_ATTR_RO(acpi_table_, length);
CONFIGFS_ATTR_RO(acpi_table_, revision);
CONFIGFS_ATTR_RO(acpi_table_, oem_id);
CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);

static struct configfs_attribute *acpi_table_attrs[] = {
	&acpi_table_attr_signature,
	&acpi_table_attr_length,
	&acpi_table_attr_revision,
	&acpi_table_attr_oem_id,
	&acpi_table_attr_oem_table_id,
	&acpi_table_attr_oem_revision,
	&acpi_table_attr_asl_compiler_id,
	&acpi_table_attr_asl_compiler_revision,
	NULL,
};

static const struct config_item_type acpi_table_type = {
	.ct_owner = THIS_MODULE,
	.ct_bin_attrs = acpi_table_bin_attrs,
	.ct_attrs = acpi_table_attrs,
};

static struct config_item *acpi_table_make_item(struct config_group *group,
						const char *name)
{
	struct acpi_table *table;

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
		return ERR_PTR(-ENOMEM);

	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
	return &table->cfg;
}

static void acpi_table_drop_item(struct config_group *group,
				 struct config_item *cfg)
{
	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);

	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
	acpi_unload_table(table->index);
	config_item_put(cfg);
}

static struct configfs_group_operations acpi_table_group_ops = {
	.make_item = acpi_table_make_item,
	.drop_item = acpi_table_drop_item,
};

static const struct config_item_type acpi_tables_type = {
	.ct_owner = THIS_MODULE,
	.ct_group_ops = &acpi_table_group_ops,
};

static const struct config_item_type acpi_root_group_type = {
	.ct_owner = THIS_MODULE,
};

static struct configfs_subsystem acpi_configfs = {
	.su_group = {
		.cg_item = {
			.ci_namebuf = "acpi",
			.ci_type = &acpi_root_group_type,
		},
	},
	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
};

static int __init acpi_configfs_init(void)
{
	int ret;
	struct config_group *root = &acpi_configfs.su_group;

	config_group_init(root);

	ret = configfs_register_subsystem(&acpi_configfs);
	if (ret)
		return ret;

	acpi_table_group = configfs_register_default_group(root, "table",
							   &acpi_tables_type);
	return PTR_ERR_OR_ZERO(acpi_table_group);
}
module_init(acpi_configfs_init);

static void __exit acpi_configfs_exit(void)
{
	configfs_unregister_default_group(acpi_table_group);
	configfs_unregister_subsystem(&acpi_configfs);
}
module_exit(acpi_configfs_exit);

MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
MODULE_DESCRIPTION("ACPI configfs support");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
0bf54fcd OP	2	/*
	3	* ACPI configfs support
	4	*
	5	* Copyright (c) 2016 Intel Corporation
0bf54fcd OP	6	*/
0bf54fcd OP	7
612bd01f OP	8	#define pr_fmt(fmt) "ACPI configfs: " fmt
612bd01f OP	9
0bf54fcd OP	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/configfs.h>
	13	#include <linux/acpi.h>
75b0cea7	14	#include <linux/security.h>
0bf54fcd	15
772bf1e2 JK	16	#include "acpica/accommon.h"
	17	#include "acpica/actables.h"
	18
612bd01f OP	19	static struct config_group *acpi_table_group;
	20
	21	struct acpi_table {
	22	struct config_item cfg;
	23	struct acpi_table_header *header;
772bf1e2	24	u32 index;
612bd01f OP	25	};
	26
	27	static ssize_t acpi_table_aml_write(struct config_item *cfg,
	28	const void *data, size_t size)
	29	{
	30	const struct acpi_table_header *header = data;
	31	struct acpi_table *table;
75b0cea7 JD	32	int ret = security_locked_down(LOCKDOWN_ACPI_TABLES);
	33
	34	if (ret)
	35	return ret;
612bd01f OP	36
	37	table = container_of(cfg, struct acpi_table, cfg);
	38
	39	if (table->header) {
	40	pr_err("table already loaded\n");
	41	return -EBUSY;
	42	}
	43
	44	if (header->length != size) {
	45	pr_err("invalid table length\n");
	46	return -EINVAL;
	47	}
	48
	49	if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
	50	pr_err("invalid table signature\n");
	51	return -EINVAL;
	52	}
	53
	54	table = container_of(cfg, struct acpi_table, cfg);
	55
	56	table->header = kmemdup(header, header->length, GFP_KERNEL);
	57	if (!table->header)
	58	return -ENOMEM;
	59
1770093c	60	ret = acpi_load_table(table->header, &table->index);
612bd01f OP	61	if (ret) {
	62	kfree(table->header);
	63	table->header = NULL;
	64	}
	65
	66	return ret;
	67	}
	68
	69	static inline struct acpi_table_header get_header(struct config_item cfg)
	70	{
	71	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
	72
	73	if (!table->header)
	74	pr_err("table not loaded\n");
	75
	76	return table->header;
	77	}
	78
	79	static ssize_t acpi_table_aml_read(struct config_item *cfg,
	80	void *data, size_t size)
	81	{
	82	struct acpi_table_header *h = get_header(cfg);
	83
	84	if (!h)
	85	return -EINVAL;
	86
	87	if (data)
	88	memcpy(data, h, h->length);
	89
	90	return h->length;
	91	}
	92
	93	#define MAX_ACPI_TABLE_SIZE (128 * 1024)
	94
	95	CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);
	96
bf567dd3	97	static struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
612bd01f OP	98	&acpi_table_attr_aml,
	99	NULL,
	100	};
	101
c62c15a9	102	static ssize_t acpi_table_signature_show(struct config_item cfg, char str)
612bd01f OP	103	{
	104	struct acpi_table_header *h = get_header(cfg);
	105
	106	if (!h)
	107	return -EINVAL;
	108
32786755	109	return sprintf(str, "%.*s\n", ACPI_NAMESEG_SIZE, h->signature);
612bd01f OP	110	}
612bd01f OP	111
c62c15a9	112	static ssize_t acpi_table_length_show(struct config_item cfg, char str)
612bd01f OP	113	{
	114	struct acpi_table_header *h = get_header(cfg);
	115
	116	if (!h)
	117	return -EINVAL;
	118
	119	return sprintf(str, "%d\n", h->length);
	120	}
	121
c62c15a9	122	static ssize_t acpi_table_revision_show(struct config_item cfg, char str)
612bd01f OP	123	{
	124	struct acpi_table_header *h = get_header(cfg);
	125
	126	if (!h)
	127	return -EINVAL;
	128
	129	return sprintf(str, "%d\n", h->revision);
	130	}
	131
c62c15a9	132	static ssize_t acpi_table_oem_id_show(struct config_item cfg, char str)
612bd01f OP	133	{
	134	struct acpi_table_header *h = get_header(cfg);
	135
	136	if (!h)
	137	return -EINVAL;
	138
	139	return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
	140	}
	141
c62c15a9	142	static ssize_t acpi_table_oem_table_id_show(struct config_item cfg, char str)
612bd01f OP	143	{
	144	struct acpi_table_header *h = get_header(cfg);
	145
	146	if (!h)
	147	return -EINVAL;
	148
	149	return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
	150	}
	151
c62c15a9	152	static ssize_t acpi_table_oem_revision_show(struct config_item cfg, char str)
612bd01f OP	153	{
	154	struct acpi_table_header *h = get_header(cfg);
	155
	156	if (!h)
	157	return -EINVAL;
	158
	159	return sprintf(str, "%d\n", h->oem_revision);
	160	}
	161
c62c15a9 AS	162	static ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg,
c62c15a9 AS	163	char *str)
612bd01f OP	164	{
	165	struct acpi_table_header *h = get_header(cfg);
	166
	167	if (!h)
	168	return -EINVAL;
	169
32786755	170	return sprintf(str, "%.*s\n", ACPI_NAMESEG_SIZE, h->asl_compiler_id);
612bd01f OP	171	}
612bd01f OP	172
c62c15a9 AS	173	static ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
c62c15a9 AS	174	char *str)
612bd01f OP	175	{
	176	struct acpi_table_header *h = get_header(cfg);
	177
	178	if (!h)
	179	return -EINVAL;
	180
	181	return sprintf(str, "%d\n", h->asl_compiler_revision);
	182	}
	183
	184	CONFIGFS_ATTR_RO(acpi_table_, signature);
	185	CONFIGFS_ATTR_RO(acpi_table_, length);
	186	CONFIGFS_ATTR_RO(acpi_table_, revision);
	187	CONFIGFS_ATTR_RO(acpi_table_, oem_id);
	188	CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
	189	CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
	190	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
	191	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);
	192
bf567dd3	193	static struct configfs_attribute *acpi_table_attrs[] = {
612bd01f OP	194	&acpi_table_attr_signature,
	195	&acpi_table_attr_length,
	196	&acpi_table_attr_revision,
	197	&acpi_table_attr_oem_id,
	198	&acpi_table_attr_oem_table_id,
	199	&acpi_table_attr_oem_revision,
	200	&acpi_table_attr_asl_compiler_id,
	201	&acpi_table_attr_asl_compiler_revision,
	202	NULL,
	203	};
	204
c1e95084	205	static const struct config_item_type acpi_table_type = {
612bd01f OP	206	.ct_owner = THIS_MODULE,
	207	.ct_bin_attrs = acpi_table_bin_attrs,
	208	.ct_attrs = acpi_table_attrs,
	209	};
	210
	211	static struct config_item acpi_table_make_item(struct config_group group,
	212	const char *name)
	213	{
	214	struct acpi_table *table;
	215
	216	table = kzalloc(sizeof(*table), GFP_KERNEL);
	217	if (!table)
	218	return ERR_PTR(-ENOMEM);
	219
	220	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
	221	return &table->cfg;
	222	}
	223
772bf1e2 JK	224	static void acpi_table_drop_item(struct config_group *group,
	225	struct config_item *cfg)
	226	{
	227	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
	228
	229	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
1770093c	230	acpi_unload_table(table->index);
9a2e849f	231	config_item_put(cfg);
772bf1e2 JK	232	}
772bf1e2 JK	233
bf567dd3	234	static struct configfs_group_operations acpi_table_group_ops = {
612bd01f	235	.make_item = acpi_table_make_item,
772bf1e2	236	.drop_item = acpi_table_drop_item,
612bd01f OP	237	};
612bd01f OP	238
c1e95084	239	static const struct config_item_type acpi_tables_type = {
612bd01f OP	240	.ct_owner = THIS_MODULE,
	241	.ct_group_ops = &acpi_table_group_ops,
	242	};
	243
c1e95084	244	static const struct config_item_type acpi_root_group_type = {
0bf54fcd OP	245	.ct_owner = THIS_MODULE,
	246	};
	247
	248	static struct configfs_subsystem acpi_configfs = {
	249	.su_group = {
	250	.cg_item = {
	251	.ci_namebuf = "acpi",
	252	.ci_type = &acpi_root_group_type,
	253	},
	254	},
	255	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
	256	};
	257
	258	static int __init acpi_configfs_init(void)
	259	{
	260	int ret;
	261	struct config_group *root = &acpi_configfs.su_group;
	262
	263	config_group_init(root);
	264
	265	ret = configfs_register_subsystem(&acpi_configfs);
	266	if (ret)
	267	return ret;
	268
612bd01f OP	269	acpi_table_group = configfs_register_default_group(root, "table",
	270	&acpi_tables_type);
	271	return PTR_ERR_OR_ZERO(acpi_table_group);
0bf54fcd OP	272	}
	273	module_init(acpi_configfs_init);
	274
	275	static void __exit acpi_configfs_exit(void)
	276	{
612bd01f	277	configfs_unregister_default_group(acpi_table_group);
0bf54fcd OP	278	configfs_unregister_subsystem(&acpi_configfs);
	279	}
	280	module_exit(acpi_configfs_exit);
	281
	282	MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
	283	MODULE_DESCRIPTION("ACPI configfs support");
	284	MODULE_LICENSE("GPL v2");