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linux
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base
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topology.c
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// 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) \ static ssize_t name##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ return sysfs_emit(buf, fmt "\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, "%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, 0); static BIN_ATTR_RO(thread_siblings_list, 0); define_siblings_read_func(core_cpus, sibling_cpumask); static BIN_ATTR_RO(core_cpus, 0); static BIN_ATTR_RO(core_cpus_list, 0); define_siblings_read_func(core_siblings, core_cpumask); static BIN_ATTR_RO(core_siblings, 0); static BIN_ATTR_RO(core_siblings_list, 0); #ifdef TOPOLOGY_CLUSTER_SYSFS define_siblings_read_func(cluster_cpus, cluster_cpumask); static BIN_ATTR_RO(cluster_cpus, 0); static BIN_ATTR_RO(cluster_cpus_list, 0); #endif #ifdef TOPOLOGY_DIE_SYSFS define_siblings_read_func(die_cpus, die_cpumask); static BIN_ATTR_RO(die_cpus, 0); static BIN_ATTR_RO(die_cpus_list, 0); #endif define_siblings_read_func(package_cpus, core_cpumask); static BIN_ATTR_RO(package_cpus, 0); static BIN_ATTR_RO(package_cpus_list, 0); #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, 0); static BIN_ATTR_RO(book_siblings_list, 0); #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, 0); static BIN_ATTR_RO(drawer_siblings_list, 0); #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, #ifdef TOPOLOGY_CLUSTER_SYSFS &bin_attr_cluster_cpus, &bin_attr_cluster_cpus_list, #endif #ifdef TOPOLOGY_DIE_SYSFS &bin_attr_die_cpus, &bin_attr_die_cpus_list, #endif &bin_attr_package_cpus, &bin_attr_package_cpus_list, #ifdef TOPOLOGY_BOOK_SYSFS &bin_attr_book_siblings, &bin_attr_book_siblings_list, #endif #ifdef TOPOLOGY_DRAWER_SYSFS &bin_attr_drawer_siblings, &bin_attr_drawer_siblings_list, #endif NULL }; static struct attribute *default_attrs[] = { &dev_attr_physical_package_id.attr, #ifdef TOPOLOGY_DIE_SYSFS &dev_attr_die_id.attr, #endif #ifdef TOPOLOGY_CLUSTER_SYSFS &dev_attr_cluster_id.attr, #endif &dev_attr_core_id.attr, #ifdef TOPOLOGY_BOOK_SYSFS &dev_attr_book_id.attr, #endif #ifdef TOPOLOGY_DRAWER_SYSFS &dev_attr_drawer_id.attr, #endif &dev_attr_ppin.attr, NULL }; static umode_t topology_is_visible(struct kobject *kobj, struct attribute *attr, int unused) { if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id)) return 0; return attr->mode; } static const struct attribute_group topology_attr_group = { .attrs = default_attrs, .bin_attrs = bin_attrs, .is_visible = topology_is_visible, .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);
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