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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1770093c5b
ACPICA commit d1716a829d19be23277d9157c575a03b9abb7457
For unloading an ACPI table, it is necessary to provide the index of
the table. The method intended for dynamically loading or hotplug
addition of tables, acpi_load_table(), should provide this information
via an optional pointer to the loaded table index.
This patch fixes the table unload function of acpi_configfs.
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Fixes: d06c47e3dd
("ACPI: configfs: Resolve objects on host-directed table loads")
Link: https://github.com/acpica/acpica/commit/d1716a82
Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
280 lines
6.2 KiB
C
280 lines
6.2 KiB
C
// 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 "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;
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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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}
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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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return PTR_ERR_OR_ZERO(acpi_table_group);
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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 <octavian.purdila@intel.com>");
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MODULE_DESCRIPTION("ACPI configfs support");
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MODULE_LICENSE("GPL v2");
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