![Denis V. Lunev](/assets/img/avatar_default.png)
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data be setup before gluing PDE to main tree. Add correct ->owner to proc_fops to fix reading/module unloading race. Signed-off-by: Denis V. Lunev <den@openvz.org> Cc: Len Brown <lenb@kernel.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
514 lines
12 KiB
C
514 lines
12 KiB
C
/*
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* acpi_system.c - ACPI System Driver ($Revision: 63 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("system");
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#ifdef MODULE_PARAM_PREFIX
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#undef MODULE_PARAM_PREFIX
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#endif
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#define MODULE_PARAM_PREFIX "acpi."
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#define ACPI_SYSTEM_CLASS "system"
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#define ACPI_SYSTEM_DEVICE_NAME "System"
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u32 acpi_irq_handled;
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/*
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* Make ACPICA version work as module param
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*/
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static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
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{
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int result;
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result = sprintf(buffer, "%x", ACPI_CA_VERSION);
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return result;
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}
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module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
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/* --------------------------------------------------------------------------
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FS Interface (/sys)
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-------------------------------------------------------------------------- */
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static LIST_HEAD(acpi_table_attr_list);
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static struct kobject *tables_kobj;
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struct acpi_table_attr {
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struct bin_attribute attr;
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char name[8];
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int instance;
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struct list_head node;
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};
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static ssize_t acpi_table_show(struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t offset, size_t count)
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{
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struct acpi_table_attr *table_attr =
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container_of(bin_attr, struct acpi_table_attr, attr);
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struct acpi_table_header *table_header = NULL;
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acpi_status status;
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ssize_t ret_count = count;
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status =
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acpi_get_table(table_attr->name, table_attr->instance,
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&table_header);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (offset >= table_header->length) {
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ret_count = 0;
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goto end;
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}
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if (offset + ret_count > table_header->length)
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ret_count = table_header->length - offset;
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memcpy(buf, ((char *)table_header) + offset, ret_count);
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end:
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return ret_count;
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}
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static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
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struct acpi_table_header *table_header)
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{
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struct acpi_table_header *header = NULL;
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struct acpi_table_attr *attr = NULL;
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memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
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list_for_each_entry(attr, &acpi_table_attr_list, node) {
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if (!memcmp(table_header->signature, attr->name,
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ACPI_NAME_SIZE))
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if (table_attr->instance < attr->instance)
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table_attr->instance = attr->instance;
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}
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table_attr->instance++;
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if (table_attr->instance > 1 || (table_attr->instance == 1 &&
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!acpi_get_table(table_header->
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signature, 2,
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&header)))
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sprintf(table_attr->name + 4, "%d", table_attr->instance);
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table_attr->attr.size = 0;
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table_attr->attr.read = acpi_table_show;
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table_attr->attr.attr.name = table_attr->name;
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table_attr->attr.attr.mode = 0444;
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table_attr->attr.attr.owner = THIS_MODULE;
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return;
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}
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static int acpi_system_sysfs_init(void)
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{
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struct acpi_table_attr *table_attr;
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struct acpi_table_header *table_header = NULL;
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int table_index = 0;
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int result;
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tables_kobj = kobject_create_and_add("tables", acpi_kobj);
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if (!tables_kobj)
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return -ENOMEM;
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do {
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result = acpi_get_table_by_index(table_index, &table_header);
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if (!result) {
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table_index++;
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table_attr = NULL;
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table_attr =
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kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
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if (!table_attr)
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return -ENOMEM;
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acpi_table_attr_init(table_attr, table_header);
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result =
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sysfs_create_bin_file(tables_kobj,
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&table_attr->attr);
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if (result) {
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kfree(table_attr);
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return result;
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} else
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list_add_tail(&table_attr->node,
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&acpi_table_attr_list);
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}
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} while (!result);
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kobject_uevent(tables_kobj, KOBJ_ADD);
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return 0;
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}
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/*
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* Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
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* See Documentation/ABI/testing/sysfs-firmware-acpi
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*/
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#define COUNT_GPE 0
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#define COUNT_SCI 1 /* acpi_irq_handled */
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#define COUNT_ERROR 2 /* other */
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#define NUM_COUNTERS_EXTRA 3
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static u32 *all_counters;
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static u32 num_gpes;
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static u32 num_counters;
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static struct attribute **all_attrs;
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static u32 acpi_gpe_count;
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static struct attribute_group interrupt_stats_attr_group = {
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.name = "interrupts",
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};
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static struct kobj_attribute *counter_attrs;
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static int count_num_gpes(void)
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{
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int count = 0;
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struct acpi_gpe_xrupt_info *gpe_xrupt_info;
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struct acpi_gpe_block_info *gpe_block;
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acpi_cpu_flags flags;
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flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
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gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
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while (gpe_xrupt_info) {
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gpe_block = gpe_xrupt_info->gpe_block_list_head;
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while (gpe_block) {
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count += gpe_block->register_count *
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ACPI_GPE_REGISTER_WIDTH;
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gpe_block = gpe_block->next;
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}
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gpe_xrupt_info = gpe_xrupt_info->next;
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}
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acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
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return count;
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}
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static void delete_gpe_attr_array(void)
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{
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u32 *tmp = all_counters;
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all_counters = NULL;
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kfree(tmp);
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if (counter_attrs) {
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int i;
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for (i = 0; i < num_gpes; i++)
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kfree(counter_attrs[i].attr.name);
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kfree(counter_attrs);
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}
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kfree(all_attrs);
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return;
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}
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void acpi_os_gpe_count(u32 gpe_number)
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{
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acpi_gpe_count++;
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if (!all_counters)
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return;
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if (gpe_number < num_gpes)
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all_counters[gpe_number]++;
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else
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
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return;
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}
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void acpi_os_fixed_event_count(u32 event_number)
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{
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if (!all_counters)
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return;
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if (event_number < ACPI_NUM_FIXED_EVENTS)
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all_counters[num_gpes + event_number]++;
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else
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
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return;
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}
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static ssize_t counter_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
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acpi_irq_handled;
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
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acpi_gpe_count;
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return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
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}
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/*
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* counter_set() sets the specified counter.
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* setting the total "sci" file to any value clears all counters.
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*/
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static ssize_t counter_set(struct kobject *kobj,
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struct kobj_attribute *attr, const char *buf, size_t size)
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{
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int index = attr - counter_attrs;
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if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
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int i;
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for (i = 0; i < num_counters; ++i)
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all_counters[i] = 0;
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acpi_gpe_count = 0;
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acpi_irq_handled = 0;
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} else
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all_counters[index] = strtoul(buf, NULL, 0);
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return size;
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}
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void acpi_irq_stats_init(void)
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{
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int i;
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if (all_counters)
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return;
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num_gpes = count_num_gpes();
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num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
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all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
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GFP_KERNEL);
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if (all_attrs == NULL)
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return;
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all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
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if (all_counters == NULL)
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goto fail;
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counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
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GFP_KERNEL);
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if (counter_attrs == NULL)
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goto fail;
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for (i = 0; i < num_counters; ++i) {
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char buffer[12];
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char *name;
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if (i < num_gpes)
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sprintf(buffer, "gpe%02X", i);
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else if (i == num_gpes + ACPI_EVENT_PMTIMER)
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sprintf(buffer, "ff_pmtimer");
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else if (i == num_gpes + ACPI_EVENT_GLOBAL)
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sprintf(buffer, "ff_gbl_lock");
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else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
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sprintf(buffer, "ff_pwr_btn");
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else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
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sprintf(buffer, "ff_slp_btn");
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else if (i == num_gpes + ACPI_EVENT_RTC)
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sprintf(buffer, "ff_rt_clk");
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else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
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sprintf(buffer, "gpe_all");
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else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
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sprintf(buffer, "sci");
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else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
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sprintf(buffer, "error");
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else
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sprintf(buffer, "bug%02X", i);
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name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
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if (name == NULL)
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goto fail;
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strncpy(name, buffer, strlen(buffer) + 1);
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counter_attrs[i].attr.name = name;
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counter_attrs[i].attr.mode = 0644;
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counter_attrs[i].show = counter_show;
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counter_attrs[i].store = counter_set;
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all_attrs[i] = &counter_attrs[i].attr;
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}
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interrupt_stats_attr_group.attrs = all_attrs;
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if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
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return;
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fail:
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delete_gpe_attr_array();
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return;
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}
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static void __exit interrupt_stats_exit(void)
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{
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sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
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delete_gpe_attr_array();
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return;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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#ifdef CONFIG_ACPI_PROCFS
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#define ACPI_SYSTEM_FILE_INFO "info"
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#define ACPI_SYSTEM_FILE_EVENT "event"
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#define ACPI_SYSTEM_FILE_DSDT "dsdt"
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#define ACPI_SYSTEM_FILE_FADT "fadt"
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static int acpi_system_read_info(struct seq_file *seq, void *offset)
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{
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seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
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return 0;
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}
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static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_system_read_info, PDE(inode)->data);
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}
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static const struct file_operations acpi_system_info_ops = {
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.owner = THIS_MODULE,
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.open = acpi_system_info_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
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loff_t *);
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static const struct file_operations acpi_system_dsdt_ops = {
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.owner = THIS_MODULE,
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.read = acpi_system_read_dsdt,
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};
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static ssize_t
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acpi_system_read_dsdt(struct file *file,
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char __user * buffer, size_t count, loff_t * ppos)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header *dsdt = NULL;
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ssize_t res;
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status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
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return res;
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}
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static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
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loff_t *);
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static const struct file_operations acpi_system_fadt_ops = {
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.owner = THIS_MODULE,
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.read = acpi_system_read_fadt,
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};
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static ssize_t
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acpi_system_read_fadt(struct file *file,
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char __user * buffer, size_t count, loff_t * ppos)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header *fadt = NULL;
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ssize_t res;
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status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
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return res;
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}
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static int acpi_system_procfs_init(void)
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{
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struct proc_dir_entry *entry;
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int error = 0;
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/* 'info' [R] */
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entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
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&acpi_system_info_ops);
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if (!entry)
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goto Error;
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/* 'dsdt' [R] */
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entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
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&acpi_system_dsdt_ops);
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if (!entry)
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goto Error;
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/* 'fadt' [R] */
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entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
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&acpi_system_fadt_ops);
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if (!entry)
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goto Error;
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Done:
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return error;
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Error:
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remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
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remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
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remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
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error = -EFAULT;
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goto Done;
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}
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#else
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static int acpi_system_procfs_init(void)
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{
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return 0;
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}
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#endif
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static int __init acpi_system_init(void)
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{
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int result = 0;
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if (acpi_disabled)
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return 0;
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result = acpi_system_procfs_init();
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if (result)
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return result;
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result = acpi_system_sysfs_init();
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return result;
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}
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subsys_initcall(acpi_system_init);
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