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154 lines
4.1 KiB
154 lines
4.1 KiB
// 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, 0); |
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static BIN_ATTR_RO(thread_siblings_list, 0); |
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define_siblings_read_func(core_cpus, sibling_cpumask); |
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static BIN_ATTR_RO(core_cpus, 0); |
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static BIN_ATTR_RO(core_cpus_list, 0); |
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define_siblings_read_func(core_siblings, core_cpumask); |
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static BIN_ATTR_RO(core_siblings, 0); |
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static BIN_ATTR_RO(core_siblings_list, 0); |
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define_siblings_read_func(die_cpus, die_cpumask); |
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static BIN_ATTR_RO(die_cpus, 0); |
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static BIN_ATTR_RO(die_cpus_list, 0); |
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define_siblings_read_func(package_cpus, core_cpumask); |
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static BIN_ATTR_RO(package_cpus, 0); |
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static BIN_ATTR_RO(package_cpus_list, 0); |
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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, 0); |
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static BIN_ATTR_RO(book_siblings_list, 0); |
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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, 0); |
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static BIN_ATTR_RO(drawer_siblings_list, 0); |
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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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