linux/drivers/acpi/system.c

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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#include <acpi/acpi_drivers.h>
#define PREFIX "ACPI: "
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("system");
#define ACPI_SYSTEM_CLASS "system"
#define ACPI_SYSTEM_DEVICE_NAME "System"
u32 acpi_irq_handled;
u32 acpi_irq_not_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;
static struct kobject *dynamic_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;
char name[ACPI_NAME_SIZE];
if (strncmp(table_attr->name, "NULL", 4))
memcpy(name, table_attr->name, ACPI_NAME_SIZE);
else
memcpy(name, "\0\0\0\0", 4);
status =
acpi_get_table(name, table_attr->instance,
&table_header);
if (ACPI_FAILURE(status))
return -ENODEV;
return memory_read_from_buffer(buf, count, &offset,
table_header, table_header->length);
}
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;
sysfs_attr_init(&table_attr->attr.attr);
if (table_header->signature[0] != '\0')
memcpy(table_attr->name, table_header->signature,
ACPI_NAME_SIZE);
else
memcpy(table_attr->name, "NULL", 4);
list_for_each_entry(attr, &acpi_table_attr_list, node) {
if (!memcmp(table_attr->name, 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 + ACPI_NAME_SIZE, "%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 = 0400;
return;
}
static acpi_status
acpi_sysfs_table_handler(u32 event, void *table, void *context)
{
struct acpi_table_attr *table_attr;
switch (event) {
case ACPI_TABLE_EVENT_LOAD:
table_attr =
kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
if (!table_attr)
return AE_NO_MEMORY;
acpi_table_attr_init(table_attr, table);
if (sysfs_create_bin_file(dynamic_tables_kobj,
&table_attr->attr)) {
kfree(table_attr);
return AE_ERROR;
} else
list_add_tail(&table_attr->node,
&acpi_table_attr_list);
break;
case ACPI_TABLE_EVENT_UNLOAD:
/*
* we do not need to do anything right now
* because the table is not deleted from the
* global table list when unloading it.
*/
break;
default:
return AE_BAD_PARAMETER;
}
return AE_OK;
}
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)
goto err;
dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
if (!dynamic_tables_kobj)
goto err_dynamic_tables;
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);
kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
return result == AE_OK ? 0 : -EINVAL;
err_dynamic_tables:
kobject_put(tables_kobj);
err:
return -ENOMEM;
}
/*
* 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_SCI_NOT 2 /* acpi_irq_not_handled */
#define COUNT_ERROR 3 /* other */
#define NUM_COUNTERS_EXTRA 4
struct event_counter {
u32 count;
u32 flags;
};
static struct event_counter *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 void delete_gpe_attr_array(void)
{
struct event_counter *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].count++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
count++;
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].count++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
count++;
return;
}
static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
{
int result = 0;
if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
goto end;
if (index < num_gpes) {
result = acpi_get_gpe_device(index, handle);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
"Invalid GPE 0x%x\n", index));
goto end;
}
result = acpi_get_gpe_status(*handle, index,
ACPI_NOT_ISR, status);
} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
result = acpi_get_event_status(index - num_gpes, status);
end:
return result;
}
static ssize_t counter_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
int index = attr - counter_attrs;
int size;
acpi_handle handle;
acpi_event_status status;
int result = 0;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
acpi_irq_handled;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
acpi_irq_not_handled;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
acpi_gpe_count;
size = sprintf(buf, "%8d", all_counters[index].count);
/* "gpe_all" or "sci" */
if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
goto end;
result = get_status(index, &status, &handle);
if (result)
goto end;
if (!(status & ACPI_EVENT_FLAG_HANDLE))
size += sprintf(buf + size, " invalid");
else if (status & ACPI_EVENT_FLAG_ENABLED)
size += sprintf(buf + size, " enabled");
else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
size += sprintf(buf + size, " wake_enabled");
else
size += sprintf(buf + size, " disabled");
end:
size += sprintf(buf + size, "\n");
return result ? result : size;
}
/*
* counter_set() sets the specified counter.
* setting the total "sci" file to any value clears all counters.
* enable/disable/clear a gpe/fixed event in user space.
*/
static ssize_t counter_set(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t size)
{
int index = attr - counter_attrs;
acpi_event_status status;
acpi_handle handle;
int result = 0;
if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
int i;
for (i = 0; i < num_counters; ++i)
all_counters[i].count = 0;
acpi_gpe_count = 0;
acpi_irq_handled = 0;
acpi_irq_not_handled = 0;
goto end;
}
/* show the event status for both GPEs and Fixed Events */
result = get_status(index, &status, &handle);
if (result)
goto end;
if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
printk(KERN_WARNING PREFIX
"Can not change Invalid GPE/Fixed Event status\n");
return -EINVAL;
}
if (index < num_gpes) {
if (!strcmp(buf, "disable\n") &&
(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_set_gpe(handle, index, ACPI_GPE_DISABLE);
else if (!strcmp(buf, "enable\n") &&
!(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_set_gpe(handle, index, ACPI_GPE_ENABLE);
else if (!strcmp(buf, "clear\n") &&
(status & ACPI_EVENT_FLAG_SET))
result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
else
all_counters[index].count = strtoul(buf, NULL, 0);
} else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
int event = index - num_gpes;
if (!strcmp(buf, "disable\n") &&
(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_disable_event(event, ACPI_NOT_ISR);
else if (!strcmp(buf, "enable\n") &&
!(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_enable_event(event, ACPI_NOT_ISR);
else if (!strcmp(buf, "clear\n") &&
(status & ACPI_EVENT_FLAG_SET))
result = acpi_clear_event(event);
else
all_counters[index].count = strtoul(buf, NULL, 0);
} else
all_counters[index].count = strtoul(buf, NULL, 0);
if (ACPI_FAILURE(result))
result = -EINVAL;
end:
return result ? result : size;
}
void acpi_irq_stats_init(void)
{
int i;
if (all_counters)
return;
num_gpes = acpi_current_gpe_count;
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(struct event_counter) * (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_SCI_NOT)
sprintf(buffer, "sci_not");
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);
sysfs_attr_init(&counter_attrs[i].attr);
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
int __init acpi_system_init(void)
{
int result;
result = acpi_system_procfs_init();
if (result)
return result;
result = acpi_system_sysfs_init();
return result;
}