linux/drivers/base/topology.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, fmt) …

#define define_siblings_read_func(name, mask) …

define_id_show_func(physical_package_id, "%d");
static DEVICE_ATTR_RO(physical_package_id);

#ifdef TOPOLOGY_DIE_SYSFS
define_id_show_func(die_id, "%d");
static DEVICE_ATTR_RO(die_id);
#endif

#ifdef TOPOLOGY_CLUSTER_SYSFS
define_id_show_func(cluster_id, "%d");
static DEVICE_ATTR_RO(cluster_id);
#endif

define_id_show_func(core_id, "%d");
static DEVICE_ATTR_RO(core_id);

define_id_show_func(ppin, "0x%llx");
static DEVICE_ATTR_ADMIN_RO(ppin);

define_siblings_read_func(thread_siblings, sibling_cpumask);
static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);

define_siblings_read_func(core_cpus, sibling_cpumask);
static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);

define_siblings_read_func(core_siblings, core_cpumask);
static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);

#ifdef TOPOLOGY_CLUSTER_SYSFS
define_siblings_read_func(cluster_cpus, cluster_cpumask);
static BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES);
#endif

#ifdef TOPOLOGY_DIE_SYSFS
define_siblings_read_func(die_cpus, die_cpumask);
static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
#endif

define_siblings_read_func(package_cpus, core_cpumask);
static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);

#ifdef TOPOLOGY_BOOK_SYSFS
define_id_show_func(book_id, "%d");
static DEVICE_ATTR_RO(book_id);
define_siblings_read_func(book_siblings, book_cpumask);
static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
#endif

#ifdef TOPOLOGY_DRAWER_SYSFS
define_id_show_func(drawer_id, "%d");
static DEVICE_ATTR_RO(drawer_id);
define_siblings_read_func(drawer_siblings, drawer_cpumask);
static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
#endif

static struct bin_attribute *bin_attrs[] = …;

static struct attribute *default_attrs[] = …;

static umode_t topology_is_visible(struct kobject *kobj,
				   struct attribute *attr, int unused)
{ … }

static const struct attribute_group topology_attr_group = …;

/* Add/Remove cpu_topology interface for CPU device */
static int topology_add_dev(unsigned int cpu)
{ … }

static int topology_remove_dev(unsigned int cpu)
{ … }

static int __init topology_sysfs_init(void)
{ … }

device_initcall(topology_sysfs_init);