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cpumask: add show cpu map functions

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* Add cpu_sysdev_class functions to display the following maps
    with cpulist_scnprintf().

	cpu_online_map
	cpu_present_map
	cpu_possible_map

  * Small change to include/linux/sysdev.h to allow the attribute
    name and label to be different (to avoid collision with the
    "attr_online" entry for bringing cpus on- and off-line.)

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis
2008-04-08 11:43:04 -07:00
committed by Ingo Molnar
parent 39106dcf85
commit 9d1fe3236a
2 changed files with 59 additions and 6 deletions
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48
drivers/base/cpu.c
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@@ -102,6 +102,51 @@ static ssize_t show_crash_notes(struct sys_device *dev, char *buf)
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, cpumask_t *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, char *buf) \
{ \
return print_cpus_map(buf, &cpu_##type##_map); \
} \
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);
struct sysdev_class_attribute *cpu_state_attr[] = {
&attr_online_map,
&attr_possible_map,
&attr_present_map,
};
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
@@ -147,6 +192,9 @@ 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);