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289 lines
6.5 KiB
289 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ACPI configfs support |
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* |
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* Copyright (c) 2016 Intel Corporation |
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*/ |
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#define pr_fmt(fmt) "ACPI configfs: " fmt |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/configfs.h> |
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#include <linux/acpi.h> |
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#include <linux/security.h> |
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#include "acpica/accommon.h" |
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#include "acpica/actables.h" |
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static struct config_group *acpi_table_group; |
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struct acpi_table { |
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struct config_item cfg; |
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struct acpi_table_header *header; |
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u32 index; |
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}; |
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static ssize_t acpi_table_aml_write(struct config_item *cfg, |
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const void *data, size_t size) |
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{ |
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const struct acpi_table_header *header = data; |
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struct acpi_table *table; |
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int ret = security_locked_down(LOCKDOWN_ACPI_TABLES); |
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if (ret) |
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return ret; |
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table = container_of(cfg, struct acpi_table, cfg); |
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if (table->header) { |
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pr_err("table already loaded\n"); |
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return -EBUSY; |
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} |
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if (header->length != size) { |
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pr_err("invalid table length\n"); |
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return -EINVAL; |
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} |
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if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) { |
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pr_err("invalid table signature\n"); |
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return -EINVAL; |
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} |
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table = container_of(cfg, struct acpi_table, cfg); |
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table->header = kmemdup(header, header->length, GFP_KERNEL); |
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if (!table->header) |
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return -ENOMEM; |
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ret = acpi_load_table(table->header, &table->index); |
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if (ret) { |
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kfree(table->header); |
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table->header = NULL; |
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} |
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return ret; |
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} |
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static inline struct acpi_table_header *get_header(struct config_item *cfg) |
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{ |
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struct acpi_table *table = container_of(cfg, struct acpi_table, cfg); |
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if (!table->header) |
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pr_err("table not loaded\n"); |
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return table->header; |
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} |
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static ssize_t acpi_table_aml_read(struct config_item *cfg, |
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void *data, size_t size) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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if (data) |
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memcpy(data, h, h->length); |
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return h->length; |
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} |
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#define MAX_ACPI_TABLE_SIZE (128 * 1024) |
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CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE); |
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static struct configfs_bin_attribute *acpi_table_bin_attrs[] = { |
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&acpi_table_attr_aml, |
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NULL, |
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}; |
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static ssize_t acpi_table_signature_show(struct config_item *cfg, char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%.*s\n", ACPI_NAMESEG_SIZE, h->signature); |
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} |
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static ssize_t acpi_table_length_show(struct config_item *cfg, char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%d\n", h->length); |
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} |
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static ssize_t acpi_table_revision_show(struct config_item *cfg, char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%d\n", h->revision); |
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} |
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static ssize_t acpi_table_oem_id_show(struct config_item *cfg, char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id); |
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} |
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static ssize_t acpi_table_oem_table_id_show(struct config_item *cfg, char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id); |
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} |
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static ssize_t acpi_table_oem_revision_show(struct config_item *cfg, char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%d\n", h->oem_revision); |
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} |
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static ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg, |
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char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%.*s\n", ACPI_NAMESEG_SIZE, h->asl_compiler_id); |
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} |
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static ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg, |
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char *str) |
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{ |
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struct acpi_table_header *h = get_header(cfg); |
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if (!h) |
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return -EINVAL; |
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return sprintf(str, "%d\n", h->asl_compiler_revision); |
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} |
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CONFIGFS_ATTR_RO(acpi_table_, signature); |
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CONFIGFS_ATTR_RO(acpi_table_, length); |
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CONFIGFS_ATTR_RO(acpi_table_, revision); |
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CONFIGFS_ATTR_RO(acpi_table_, oem_id); |
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CONFIGFS_ATTR_RO(acpi_table_, oem_table_id); |
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CONFIGFS_ATTR_RO(acpi_table_, oem_revision); |
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CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id); |
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CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision); |
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static struct configfs_attribute *acpi_table_attrs[] = { |
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&acpi_table_attr_signature, |
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&acpi_table_attr_length, |
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&acpi_table_attr_revision, |
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&acpi_table_attr_oem_id, |
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&acpi_table_attr_oem_table_id, |
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&acpi_table_attr_oem_revision, |
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&acpi_table_attr_asl_compiler_id, |
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&acpi_table_attr_asl_compiler_revision, |
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NULL, |
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}; |
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static const struct config_item_type acpi_table_type = { |
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.ct_owner = THIS_MODULE, |
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.ct_bin_attrs = acpi_table_bin_attrs, |
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.ct_attrs = acpi_table_attrs, |
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}; |
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static struct config_item *acpi_table_make_item(struct config_group *group, |
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const char *name) |
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{ |
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struct acpi_table *table; |
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table = kzalloc(sizeof(*table), GFP_KERNEL); |
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if (!table) |
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return ERR_PTR(-ENOMEM); |
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config_item_init_type_name(&table->cfg, name, &acpi_table_type); |
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return &table->cfg; |
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} |
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static void acpi_table_drop_item(struct config_group *group, |
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struct config_item *cfg) |
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{ |
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struct acpi_table *table = container_of(cfg, struct acpi_table, cfg); |
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ACPI_INFO(("Host-directed Dynamic ACPI Table Unload")); |
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acpi_unload_table(table->index); |
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config_item_put(cfg); |
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} |
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static struct configfs_group_operations acpi_table_group_ops = { |
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.make_item = acpi_table_make_item, |
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.drop_item = acpi_table_drop_item, |
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}; |
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static const struct config_item_type acpi_tables_type = { |
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.ct_owner = THIS_MODULE, |
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.ct_group_ops = &acpi_table_group_ops, |
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}; |
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static const struct config_item_type acpi_root_group_type = { |
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.ct_owner = THIS_MODULE, |
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}; |
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static struct configfs_subsystem acpi_configfs = { |
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.su_group = { |
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.cg_item = { |
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.ci_namebuf = "acpi", |
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.ci_type = &acpi_root_group_type, |
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}, |
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}, |
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.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex), |
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}; |
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static int __init acpi_configfs_init(void) |
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{ |
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int ret; |
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struct config_group *root = &acpi_configfs.su_group; |
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config_group_init(root); |
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ret = configfs_register_subsystem(&acpi_configfs); |
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if (ret) |
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return ret; |
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acpi_table_group = configfs_register_default_group(root, "table", |
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&acpi_tables_type); |
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if (IS_ERR(acpi_table_group)) { |
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configfs_unregister_subsystem(&acpi_configfs); |
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return PTR_ERR(acpi_table_group); |
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} |
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return 0; |
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} |
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module_init(acpi_configfs_init); |
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static void __exit acpi_configfs_exit(void) |
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{ |
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configfs_unregister_default_group(acpi_table_group); |
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configfs_unregister_subsystem(&acpi_configfs); |
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} |
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module_exit(acpi_configfs_exit); |
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MODULE_AUTHOR("Octavian Purdila <[email protected]>"); |
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MODULE_DESCRIPTION("ACPI configfs support"); |
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MODULE_LICENSE("GPL v2");
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