android_kernel_motorola_sm6225/drivers/acpi/system.c
Denis V. Lunev cf7acfab03 acpi: use non-racy method for proc entries creation
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>
2008-04-29 08:06:22 -07:00

513 lines
12 KiB
C

/*
* acpi_system.c - ACPI System Driver ($Revision: 63 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* 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/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("system");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "acpi."
#define ACPI_SYSTEM_CLASS "system"
#define ACPI_SYSTEM_DEVICE_NAME "System"
u32 acpi_irq_handled;
/*
* Make ACPICA version work as module param
*/
static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
{
int result;
result = sprintf(buffer, "%x", ACPI_CA_VERSION);
return result;
}
module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
/* --------------------------------------------------------------------------
FS Interface (/sys)
-------------------------------------------------------------------------- */
static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;
struct acpi_table_attr {
struct bin_attribute attr;
char name[8];
int instance;
struct list_head node;
};
static ssize_t acpi_table_show(struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t offset, size_t count)
{
struct acpi_table_attr *table_attr =
container_of(bin_attr, struct acpi_table_attr, attr);
struct acpi_table_header *table_header = NULL;
acpi_status status;
ssize_t ret_count = count;
status =
acpi_get_table(table_attr->name, table_attr->instance,
&table_header);
if (ACPI_FAILURE(status))
return -ENODEV;
if (offset >= table_header->length) {
ret_count = 0;
goto end;
}
if (offset + ret_count > table_header->length)
ret_count = table_header->length - offset;
memcpy(buf, ((char *)table_header) + offset, ret_count);
end:
return ret_count;
}
static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
struct acpi_table_header *table_header)
{
struct acpi_table_header *header = NULL;
struct acpi_table_attr *attr = NULL;
memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
list_for_each_entry(attr, &acpi_table_attr_list, node) {
if (!memcmp(table_header->signature, attr->name,
ACPI_NAME_SIZE))
if (table_attr->instance < attr->instance)
table_attr->instance = attr->instance;
}
table_attr->instance++;
if (table_attr->instance > 1 || (table_attr->instance == 1 &&
!acpi_get_table(table_header->
signature, 2,
&header)))
sprintf(table_attr->name + 4, "%d", table_attr->instance);
table_attr->attr.size = 0;
table_attr->attr.read = acpi_table_show;
table_attr->attr.attr.name = table_attr->name;
table_attr->attr.attr.mode = 0444;
table_attr->attr.attr.owner = THIS_MODULE;
return;
}
static int acpi_system_sysfs_init(void)
{
struct acpi_table_attr *table_attr;
struct acpi_table_header *table_header = NULL;
int table_index = 0;
int result;
tables_kobj = kobject_create_and_add("tables", acpi_kobj);
if (!tables_kobj)
return -ENOMEM;
do {
result = acpi_get_table_by_index(table_index, &table_header);
if (!result) {
table_index++;
table_attr = NULL;
table_attr =
kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
if (!table_attr)
return -ENOMEM;
acpi_table_attr_init(table_attr, table_header);
result =
sysfs_create_bin_file(tables_kobj,
&table_attr->attr);
if (result) {
kfree(table_attr);
return result;
} else
list_add_tail(&table_attr->node,
&acpi_table_attr_list);
}
} while (!result);
kobject_uevent(tables_kobj, KOBJ_ADD);
return 0;
}
/*
* Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
* See Documentation/ABI/testing/sysfs-firmware-acpi
*/
#define COUNT_GPE 0
#define COUNT_SCI 1 /* acpi_irq_handled */
#define COUNT_ERROR 2 /* other */
#define NUM_COUNTERS_EXTRA 3
static u32 *all_counters;
static u32 num_gpes;
static u32 num_counters;
static struct attribute **all_attrs;
static u32 acpi_gpe_count;
static struct attribute_group interrupt_stats_attr_group = {
.name = "interrupts",
};
static struct kobj_attribute *counter_attrs;
static int count_num_gpes(void)
{
int count = 0;
struct acpi_gpe_xrupt_info *gpe_xrupt_info;
struct acpi_gpe_block_info *gpe_block;
acpi_cpu_flags flags;
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
while (gpe_xrupt_info) {
gpe_block = gpe_xrupt_info->gpe_block_list_head;
while (gpe_block) {
count += gpe_block->register_count *
ACPI_GPE_REGISTER_WIDTH;
gpe_block = gpe_block->next;
}
gpe_xrupt_info = gpe_xrupt_info->next;
}
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return count;
}
static void delete_gpe_attr_array(void)
{
u32 *tmp = all_counters;
all_counters = NULL;
kfree(tmp);
if (counter_attrs) {
int i;
for (i = 0; i < num_gpes; i++)
kfree(counter_attrs[i].attr.name);
kfree(counter_attrs);
}
kfree(all_attrs);
return;
}
void acpi_os_gpe_count(u32 gpe_number)
{
acpi_gpe_count++;
if (!all_counters)
return;
if (gpe_number < num_gpes)
all_counters[gpe_number]++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
return;
}
void acpi_os_fixed_event_count(u32 event_number)
{
if (!all_counters)
return;
if (event_number < ACPI_NUM_FIXED_EVENTS)
all_counters[num_gpes + event_number]++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
return;
}
static ssize_t counter_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
acpi_irq_handled;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
acpi_gpe_count;
return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
}
/*
* counter_set() sets the specified counter.
* setting the total "sci" file to any value clears all counters.
*/
static ssize_t counter_set(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t size)
{
int index = attr - counter_attrs;
if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
int i;
for (i = 0; i < num_counters; ++i)
all_counters[i] = 0;
acpi_gpe_count = 0;
acpi_irq_handled = 0;
} else
all_counters[index] = strtoul(buf, NULL, 0);
return size;
}
void acpi_irq_stats_init(void)
{
int i;
if (all_counters)
return;
num_gpes = count_num_gpes();
num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
GFP_KERNEL);
if (all_attrs == NULL)
return;
all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
if (all_counters == NULL)
goto fail;
counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
GFP_KERNEL);
if (counter_attrs == NULL)
goto fail;
for (i = 0; i < num_counters; ++i) {
char buffer[12];
char *name;
if (i < num_gpes)
sprintf(buffer, "gpe%02X", i);
else if (i == num_gpes + ACPI_EVENT_PMTIMER)
sprintf(buffer, "ff_pmtimer");
else if (i == num_gpes + ACPI_EVENT_GLOBAL)
sprintf(buffer, "ff_gbl_lock");
else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
sprintf(buffer, "ff_pwr_btn");
else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
sprintf(buffer, "ff_slp_btn");
else if (i == num_gpes + ACPI_EVENT_RTC)
sprintf(buffer, "ff_rt_clk");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
sprintf(buffer, "gpe_all");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
sprintf(buffer, "sci");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
sprintf(buffer, "error");
else
sprintf(buffer, "bug%02X", i);
name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
if (name == NULL)
goto fail;
strncpy(name, buffer, strlen(buffer) + 1);
counter_attrs[i].attr.name = name;
counter_attrs[i].attr.mode = 0644;
counter_attrs[i].show = counter_show;
counter_attrs[i].store = counter_set;
all_attrs[i] = &counter_attrs[i].attr;
}
interrupt_stats_attr_group.attrs = all_attrs;
if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
return;
fail:
delete_gpe_attr_array();
return;
}
static void __exit interrupt_stats_exit(void)
{
sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
delete_gpe_attr_array();
return;
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_PROCFS
#define ACPI_SYSTEM_FILE_INFO "info"
#define ACPI_SYSTEM_FILE_EVENT "event"
#define ACPI_SYSTEM_FILE_DSDT "dsdt"
#define ACPI_SYSTEM_FILE_FADT "fadt"
static int acpi_system_read_info(struct seq_file *seq, void *offset)
{
seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
return 0;
}
static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_system_read_info, PDE(inode)->data);
}
static const struct file_operations acpi_system_info_ops = {
.owner = THIS_MODULE,
.open = acpi_system_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
loff_t *);
static const struct file_operations acpi_system_dsdt_ops = {
.owner = THIS_MODULE,
.read = acpi_system_read_dsdt,
};
static ssize_t
acpi_system_read_dsdt(struct file *file,
char __user * buffer, size_t count, loff_t * ppos)
{
acpi_status status = AE_OK;
struct acpi_table_header *dsdt = NULL;
ssize_t res;
status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
if (ACPI_FAILURE(status))
return -ENODEV;
res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
return res;
}
static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
loff_t *);
static const struct file_operations acpi_system_fadt_ops = {
.owner = THIS_MODULE,
.read = acpi_system_read_fadt,
};
static ssize_t
acpi_system_read_fadt(struct file *file,
char __user * buffer, size_t count, loff_t * ppos)
{
acpi_status status = AE_OK;
struct acpi_table_header *fadt = NULL;
ssize_t res;
status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
if (ACPI_FAILURE(status))
return -ENODEV;
res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
return res;
}
static int acpi_system_procfs_init(void)
{
struct proc_dir_entry *entry;
int error = 0;
/* 'info' [R] */
entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
&acpi_system_info_ops);
if (!entry)
goto Error;
/* 'dsdt' [R] */
entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
&acpi_system_dsdt_ops);
if (!entry)
goto Error;
/* 'fadt' [R] */
entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
&acpi_system_fadt_ops);
if (!entry)
goto Error;
Done:
return error;
Error:
remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
error = -EFAULT;
goto Done;
}
#else
static int acpi_system_procfs_init(void)
{
return 0;
}
#endif
static int __init acpi_system_init(void)
{
int result = 0;
if (acpi_disabled)
return 0;
result = acpi_system_procfs_init();
if (result)
return result;
result = acpi_system_sysfs_init();
return result;
}
subsys_initcall(acpi_system_init);