linux/drivers/base/topology.c
Len Brown 2e4c54dac7 topology: Create core_cpus and die_cpus sysfs attributes
Create CPU topology sysfs attributes: "core_cpus" and "core_cpus_list"

These attributes represent all of the logical CPUs that share the
same core.

These attriutes is synonymous with the existing "thread_siblings" and
"thread_siblings_list" attribute, which will be deprecated.

Create CPU topology sysfs attributes: "die_cpus" and "die_cpus_list".
These attributes represent all of the logical CPUs that share the
same die.

Suggested-by: Brice Goglin <Brice.Goglin@inria.fr>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/071c23a298cd27ede6ed0b6460cae190d193364f.1557769318.git.len.brown@intel.com
2019-05-23 10:08:34 +02:00

144 lines
3.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* driver/base/topology.c - Populate sysfs with cpu topology information
*
* Written by: Zhang Yanmin, Intel Corporation
*
* Copyright (C) 2006, Intel Corp.
*
* All rights reserved.
*/
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/hardirq.h>
#include <linux/topology.h>
#define define_id_show_func(name) \
static ssize_t name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
return sprintf(buf, "%d\n", topology_##name(dev->id)); \
}
#define define_siblings_show_map(name, mask) \
static ssize_t name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
}
#define define_siblings_show_list(name, mask) \
static ssize_t name##_list_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
}
#define define_siblings_show_func(name, mask) \
define_siblings_show_map(name, mask); \
define_siblings_show_list(name, mask)
define_id_show_func(physical_package_id);
static DEVICE_ATTR_RO(physical_package_id);
define_id_show_func(die_id);
static DEVICE_ATTR_RO(die_id);
define_id_show_func(core_id);
static DEVICE_ATTR_RO(core_id);
define_siblings_show_func(thread_siblings, sibling_cpumask);
static DEVICE_ATTR_RO(thread_siblings);
static DEVICE_ATTR_RO(thread_siblings_list);
define_siblings_show_func(core_cpus, sibling_cpumask);
static DEVICE_ATTR_RO(core_cpus);
static DEVICE_ATTR_RO(core_cpus_list);
define_siblings_show_func(core_siblings, core_cpumask);
static DEVICE_ATTR_RO(core_siblings);
static DEVICE_ATTR_RO(core_siblings_list);
define_siblings_show_func(die_cpus, die_cpumask);
static DEVICE_ATTR_RO(die_cpus);
static DEVICE_ATTR_RO(die_cpus_list);
define_siblings_show_func(package_cpus, core_cpumask);
static DEVICE_ATTR_RO(package_cpus);
static DEVICE_ATTR_RO(package_cpus_list);
#ifdef CONFIG_SCHED_BOOK
define_id_show_func(book_id);
static DEVICE_ATTR_RO(book_id);
define_siblings_show_func(book_siblings, book_cpumask);
static DEVICE_ATTR_RO(book_siblings);
static DEVICE_ATTR_RO(book_siblings_list);
#endif
#ifdef CONFIG_SCHED_DRAWER
define_id_show_func(drawer_id);
static DEVICE_ATTR_RO(drawer_id);
define_siblings_show_func(drawer_siblings, drawer_cpumask);
static DEVICE_ATTR_RO(drawer_siblings);
static DEVICE_ATTR_RO(drawer_siblings_list);
#endif
static struct attribute *default_attrs[] = {
&dev_attr_physical_package_id.attr,
&dev_attr_die_id.attr,
&dev_attr_core_id.attr,
&dev_attr_thread_siblings.attr,
&dev_attr_thread_siblings_list.attr,
&dev_attr_core_cpus.attr,
&dev_attr_core_cpus_list.attr,
&dev_attr_core_siblings.attr,
&dev_attr_core_siblings_list.attr,
&dev_attr_die_cpus.attr,
&dev_attr_die_cpus_list.attr,
&dev_attr_package_cpus.attr,
&dev_attr_package_cpus_list.attr,
#ifdef CONFIG_SCHED_BOOK
&dev_attr_book_id.attr,
&dev_attr_book_siblings.attr,
&dev_attr_book_siblings_list.attr,
#endif
#ifdef CONFIG_SCHED_DRAWER
&dev_attr_drawer_id.attr,
&dev_attr_drawer_siblings.attr,
&dev_attr_drawer_siblings_list.attr,
#endif
NULL
};
static const struct attribute_group topology_attr_group = {
.attrs = default_attrs,
.name = "topology"
};
/* Add/Remove cpu_topology interface for CPU device */
static int topology_add_dev(unsigned int cpu)
{
struct device *dev = get_cpu_device(cpu);
return sysfs_create_group(&dev->kobj, &topology_attr_group);
}
static int topology_remove_dev(unsigned int cpu)
{
struct device *dev = get_cpu_device(cpu);
sysfs_remove_group(&dev->kobj, &topology_attr_group);
return 0;
}
static int topology_sysfs_init(void)
{
return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
"base/topology:prepare", topology_add_dev,
topology_remove_dev);
}
device_initcall(topology_sysfs_init);