diff options
Diffstat (limited to 'drivers/base/topology.c')
| -rw-r--r-- | drivers/base/topology.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c new file mode 100644 index 000000000..89f98be5c --- /dev/null +++ b/drivers/base/topology.c @@ -0,0 +1,194 @@ +// 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, 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[] = { + &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); |