![Andi Kleen](/assets/img/avatar_default.png)
Passing the attribute to the low level IO functions allows all kinds of cleanups, by sharing low level IO code without requiring an own function for every piece of data. Also drivers can extend the attributes with own data fields and use that in the low level function. Similar to sysdev_attributes and normal attributes. This is a tree-wide sweep, converting everything in one go. No functional changes in this patch other than passing the new argument everywhere. Tested on x86, the non x86 parts are uncompiled. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
288 lines
6.8 KiB
C
288 lines
6.8 KiB
C
/*
|
|
* drivers/base/cpu.c - basic CPU class support
|
|
*/
|
|
|
|
#include <linux/sysdev.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/topology.h>
|
|
#include <linux/device.h>
|
|
#include <linux/node.h>
|
|
|
|
#include "base.h"
|
|
|
|
struct sysdev_class cpu_sysdev_class = {
|
|
.name = "cpu",
|
|
};
|
|
EXPORT_SYMBOL(cpu_sysdev_class);
|
|
|
|
static DEFINE_PER_CPU(struct sys_device *, cpu_sys_devices);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static ssize_t show_online(struct sys_device *dev, struct sysdev_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
|
|
return sprintf(buf, "%u\n", !!cpu_online(cpu->sysdev.id));
|
|
}
|
|
|
|
static ssize_t __ref store_online(struct sys_device *dev, struct sysdev_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
ssize_t ret;
|
|
|
|
cpu_hotplug_driver_lock();
|
|
switch (buf[0]) {
|
|
case '0':
|
|
ret = cpu_down(cpu->sysdev.id);
|
|
if (!ret)
|
|
kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
|
|
break;
|
|
case '1':
|
|
ret = cpu_up(cpu->sysdev.id);
|
|
if (!ret)
|
|
kobject_uevent(&dev->kobj, KOBJ_ONLINE);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
cpu_hotplug_driver_unlock();
|
|
|
|
if (ret >= 0)
|
|
ret = count;
|
|
return ret;
|
|
}
|
|
static SYSDEV_ATTR(online, 0644, show_online, store_online);
|
|
|
|
static void __cpuinit register_cpu_control(struct cpu *cpu)
|
|
{
|
|
sysdev_create_file(&cpu->sysdev, &attr_online);
|
|
}
|
|
void unregister_cpu(struct cpu *cpu)
|
|
{
|
|
int logical_cpu = cpu->sysdev.id;
|
|
|
|
unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
|
|
|
|
sysdev_remove_file(&cpu->sysdev, &attr_online);
|
|
|
|
sysdev_unregister(&cpu->sysdev);
|
|
per_cpu(cpu_sys_devices, logical_cpu) = NULL;
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
|
|
static ssize_t cpu_probe_store(struct class *class, const char *buf,
|
|
size_t count)
|
|
{
|
|
return arch_cpu_probe(buf, count);
|
|
}
|
|
|
|
static ssize_t cpu_release_store(struct class *class, const char *buf,
|
|
size_t count)
|
|
{
|
|
return arch_cpu_release(buf, count);
|
|
}
|
|
|
|
static CLASS_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
|
|
static CLASS_ATTR(release, S_IWUSR, NULL, cpu_release_store);
|
|
|
|
int __init cpu_probe_release_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
|
|
&class_attr_probe.attr);
|
|
if (!rc)
|
|
rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
|
|
&class_attr_release.attr);
|
|
|
|
return rc;
|
|
}
|
|
device_initcall(cpu_probe_release_init);
|
|
#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
|
|
|
|
#else /* ... !CONFIG_HOTPLUG_CPU */
|
|
static inline void register_cpu_control(struct cpu *cpu)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
#include <linux/kexec.h>
|
|
|
|
static ssize_t show_crash_notes(struct sys_device *dev, struct sysdev_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
ssize_t rc;
|
|
unsigned long long addr;
|
|
int cpunum;
|
|
|
|
cpunum = cpu->sysdev.id;
|
|
|
|
/*
|
|
* Might be reading other cpu's data based on which cpu read thread
|
|
* has been scheduled. But cpu data (memory) is allocated once during
|
|
* boot up and this data does not change there after. Hence this
|
|
* operation should be safe. No locking required.
|
|
*/
|
|
addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
|
|
rc = sprintf(buf, "%Lx\n", addr);
|
|
return rc;
|
|
}
|
|
static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL);
|
|
#endif
|
|
|
|
/*
|
|
* Print cpu online, possible, present, and system maps
|
|
*/
|
|
static ssize_t print_cpus_map(char *buf, const struct cpumask *map)
|
|
{
|
|
int n = cpulist_scnprintf(buf, PAGE_SIZE-2, map);
|
|
|
|
buf[n++] = '\n';
|
|
buf[n] = '\0';
|
|
return n;
|
|
}
|
|
|
|
#define print_cpus_func(type) \
|
|
static ssize_t print_cpus_##type(struct sysdev_class *class, \
|
|
struct sysdev_class_attribute *attr, char *buf) \
|
|
{ \
|
|
return print_cpus_map(buf, cpu_##type##_mask); \
|
|
} \
|
|
static struct sysdev_class_attribute attr_##type##_map = \
|
|
_SYSDEV_CLASS_ATTR(type, 0444, print_cpus_##type, NULL)
|
|
|
|
print_cpus_func(online);
|
|
print_cpus_func(possible);
|
|
print_cpus_func(present);
|
|
|
|
/*
|
|
* Print values for NR_CPUS and offlined cpus
|
|
*/
|
|
static ssize_t print_cpus_kernel_max(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr, char *buf)
|
|
{
|
|
int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
|
|
return n;
|
|
}
|
|
static SYSDEV_CLASS_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
|
|
|
|
/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
|
|
unsigned int total_cpus;
|
|
|
|
static ssize_t print_cpus_offline(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr, char *buf)
|
|
{
|
|
int n = 0, len = PAGE_SIZE-2;
|
|
cpumask_var_t offline;
|
|
|
|
/* display offline cpus < nr_cpu_ids */
|
|
if (!alloc_cpumask_var(&offline, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
cpumask_complement(offline, cpu_online_mask);
|
|
n = cpulist_scnprintf(buf, len, offline);
|
|
free_cpumask_var(offline);
|
|
|
|
/* display offline cpus >= nr_cpu_ids */
|
|
if (total_cpus && nr_cpu_ids < total_cpus) {
|
|
if (n && n < len)
|
|
buf[n++] = ',';
|
|
|
|
if (nr_cpu_ids == total_cpus-1)
|
|
n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
|
|
else
|
|
n += snprintf(&buf[n], len - n, "%d-%d",
|
|
nr_cpu_ids, total_cpus-1);
|
|
}
|
|
|
|
n += snprintf(&buf[n], len - n, "\n");
|
|
return n;
|
|
}
|
|
static SYSDEV_CLASS_ATTR(offline, 0444, print_cpus_offline, NULL);
|
|
|
|
static struct sysdev_class_attribute *cpu_state_attr[] = {
|
|
&attr_online_map,
|
|
&attr_possible_map,
|
|
&attr_present_map,
|
|
&attr_kernel_max,
|
|
&attr_offline,
|
|
};
|
|
|
|
static int cpu_states_init(void)
|
|
{
|
|
int i;
|
|
int err = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cpu_state_attr); i++) {
|
|
int ret;
|
|
ret = sysdev_class_create_file(&cpu_sysdev_class,
|
|
cpu_state_attr[i]);
|
|
if (!err)
|
|
err = ret;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* register_cpu - Setup a sysfs device for a CPU.
|
|
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
|
|
* sysfs for this CPU.
|
|
* @num - CPU number to use when creating the device.
|
|
*
|
|
* Initialize and register the CPU device.
|
|
*/
|
|
int __cpuinit register_cpu(struct cpu *cpu, int num)
|
|
{
|
|
int error;
|
|
cpu->node_id = cpu_to_node(num);
|
|
cpu->sysdev.id = num;
|
|
cpu->sysdev.cls = &cpu_sysdev_class;
|
|
|
|
error = sysdev_register(&cpu->sysdev);
|
|
|
|
if (!error && cpu->hotpluggable)
|
|
register_cpu_control(cpu);
|
|
if (!error)
|
|
per_cpu(cpu_sys_devices, num) = &cpu->sysdev;
|
|
if (!error)
|
|
register_cpu_under_node(num, cpu_to_node(num));
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
if (!error)
|
|
error = sysdev_create_file(&cpu->sysdev, &attr_crash_notes);
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
struct sys_device *get_cpu_sysdev(unsigned cpu)
|
|
{
|
|
if (cpu < nr_cpu_ids && cpu_possible(cpu))
|
|
return per_cpu(cpu_sys_devices, cpu);
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_cpu_sysdev);
|
|
|
|
int __init cpu_dev_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = sysdev_class_register(&cpu_sysdev_class);
|
|
if (!err)
|
|
err = cpu_states_init();
|
|
|
|
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
|
|
if (!err)
|
|
err = sched_create_sysfs_power_savings_entries(&cpu_sysdev_class);
|
|
#endif
|
|
|
|
return err;
|
|
}
|