| // 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 sysfs_emit(buf, "%d\n", topology_##name(dev->id)); \ |
| } |
| |
| #define define_siblings_read_func(name, mask) \ |
| static ssize_t name##_read(struct file *file, struct kobject *kobj, \ |
| struct bin_attribute *attr, char *buf, \ |
| loff_t off, size_t count) \ |
| { \ |
| struct device *dev = kobj_to_dev(kobj); \ |
| \ |
| return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id), \ |
| off, count); \ |
| } \ |
| \ |
| static ssize_t name##_list_read(struct file *file, struct kobject *kobj, \ |
| struct bin_attribute *attr, char *buf, \ |
| loff_t off, size_t count) \ |
| { \ |
| struct device *dev = kobj_to_dev(kobj); \ |
| \ |
| return cpumap_print_list_to_buf(buf, topology_##mask(dev->id), \ |
| off, count); \ |
| } |
| |
| 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_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); |
| |
| 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); |
| |
| 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 CONFIG_SCHED_BOOK |
| define_id_show_func(book_id); |
| 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 CONFIG_SCHED_DRAWER |
| define_id_show_func(drawer_id); |
| 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[] = { |
| &bin_attr_core_cpus, |
| &bin_attr_core_cpus_list, |
| &bin_attr_thread_siblings, |
| &bin_attr_thread_siblings_list, |
| &bin_attr_core_siblings, |
| &bin_attr_core_siblings_list, |
| &bin_attr_die_cpus, |
| &bin_attr_die_cpus_list, |
| &bin_attr_package_cpus, |
| &bin_attr_package_cpus_list, |
| #ifdef CONFIG_SCHED_BOOK |
| &bin_attr_book_siblings, |
| &bin_attr_book_siblings_list, |
| #endif |
| #ifdef CONFIG_SCHED_DRAWER |
| &bin_attr_drawer_siblings, |
| &bin_attr_drawer_siblings_list, |
| #endif |
| NULL |
| }; |
| |
| static struct attribute *default_attrs[] = { |
| &dev_attr_physical_package_id.attr, |
| &dev_attr_die_id.attr, |
| &dev_attr_core_id.attr, |
| #ifdef CONFIG_SCHED_BOOK |
| &dev_attr_book_id.attr, |
| #endif |
| #ifdef CONFIG_SCHED_DRAWER |
| &dev_attr_drawer_id.attr, |
| #endif |
| NULL |
| }; |
| |
| static const struct attribute_group topology_attr_group = { |
| .attrs = default_attrs, |
| .bin_attrs = bin_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 __init 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); |