155 lines
4.4 KiB
C
155 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* driver/base/topology.c - Populate sysfs with cpu topology information
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*
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* Written by: Zhang Yanmin, Intel Corporation
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*
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* Copyright (C) 2006, Intel Corp.
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*
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* All rights reserved.
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*/
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#include <linux/mm.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/topology.h>
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#define define_id_show_func(name) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return sysfs_emit(buf, "%d\n", topology_##name(dev->id)); \
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}
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#define define_siblings_read_func(name, mask) \
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static ssize_t name##_read(struct file *file, struct kobject *kobj, \
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struct bin_attribute *attr, char *buf, \
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loff_t off, size_t count) \
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{ \
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struct device *dev = kobj_to_dev(kobj); \
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\
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return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id), \
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off, count); \
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} \
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\
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static ssize_t name##_list_read(struct file *file, struct kobject *kobj, \
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struct bin_attribute *attr, char *buf, \
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loff_t off, size_t count) \
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{ \
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struct device *dev = kobj_to_dev(kobj); \
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\
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return cpumap_print_list_to_buf(buf, topology_##mask(dev->id), \
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off, count); \
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}
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define_id_show_func(physical_package_id);
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static DEVICE_ATTR_RO(physical_package_id);
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define_id_show_func(die_id);
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static DEVICE_ATTR_RO(die_id);
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define_id_show_func(core_id);
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static DEVICE_ATTR_RO(core_id);
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define_siblings_read_func(thread_siblings, sibling_cpumask);
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static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);
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define_siblings_read_func(core_cpus, sibling_cpumask);
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static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);
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define_siblings_read_func(core_siblings, core_cpumask);
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static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);
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define_siblings_read_func(die_cpus, die_cpumask);
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static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
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define_siblings_read_func(package_cpus, core_cpumask);
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static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);
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#ifdef CONFIG_SCHED_BOOK
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define_id_show_func(book_id);
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static DEVICE_ATTR_RO(book_id);
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define_siblings_read_func(book_siblings, book_cpumask);
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static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
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#endif
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#ifdef CONFIG_SCHED_DRAWER
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define_id_show_func(drawer_id);
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static DEVICE_ATTR_RO(drawer_id);
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define_siblings_read_func(drawer_siblings, drawer_cpumask);
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static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
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static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
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#endif
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static struct bin_attribute *bin_attrs[] = {
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&bin_attr_core_cpus,
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&bin_attr_core_cpus_list,
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&bin_attr_thread_siblings,
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&bin_attr_thread_siblings_list,
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&bin_attr_core_siblings,
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&bin_attr_core_siblings_list,
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&bin_attr_die_cpus,
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&bin_attr_die_cpus_list,
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&bin_attr_package_cpus,
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&bin_attr_package_cpus_list,
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#ifdef CONFIG_SCHED_BOOK
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&bin_attr_book_siblings,
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&bin_attr_book_siblings_list,
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#endif
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#ifdef CONFIG_SCHED_DRAWER
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&bin_attr_drawer_siblings,
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&bin_attr_drawer_siblings_list,
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#endif
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NULL
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};
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static struct attribute *default_attrs[] = {
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&dev_attr_physical_package_id.attr,
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&dev_attr_die_id.attr,
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&dev_attr_core_id.attr,
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#ifdef CONFIG_SCHED_BOOK
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&dev_attr_book_id.attr,
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#endif
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#ifdef CONFIG_SCHED_DRAWER
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&dev_attr_drawer_id.attr,
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#endif
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NULL
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};
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static const struct attribute_group topology_attr_group = {
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.attrs = default_attrs,
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.bin_attrs = bin_attrs,
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.name = "topology"
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};
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/* Add/Remove cpu_topology interface for CPU device */
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static int topology_add_dev(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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return sysfs_create_group(&dev->kobj, &topology_attr_group);
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}
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static int topology_remove_dev(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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sysfs_remove_group(&dev->kobj, &topology_attr_group);
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return 0;
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}
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static int __init topology_sysfs_init(void)
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{
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return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
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"base/topology:prepare", topology_add_dev,
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topology_remove_dev);
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}
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device_initcall(topology_sysfs_init);
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