diff options
Diffstat (limited to 'drivers/base/topology.c')
| -rw-r--r-- | drivers/base/topology.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c new file mode 100644 index 000000000..4d254fcc9 --- /dev/null +++ b/drivers/base/topology.c @@ -0,0 +1,143 @@ +// 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_show_map(name, mask) \ +static ssize_t name##_show(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\ +} + +#define define_siblings_show_list(name, mask) \ +static ssize_t name##_list_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\ +} + +#define define_siblings_show_func(name, mask) \ + define_siblings_show_map(name, mask); \ + define_siblings_show_list(name, mask) + +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_show_func(thread_siblings, sibling_cpumask); +static DEVICE_ATTR_RO(thread_siblings); +static DEVICE_ATTR_RO(thread_siblings_list); + +define_siblings_show_func(core_cpus, sibling_cpumask); +static DEVICE_ATTR_RO(core_cpus); +static DEVICE_ATTR_RO(core_cpus_list); + +define_siblings_show_func(core_siblings, core_cpumask); +static DEVICE_ATTR_RO(core_siblings); +static DEVICE_ATTR_RO(core_siblings_list); + +define_siblings_show_func(die_cpus, die_cpumask); +static DEVICE_ATTR_RO(die_cpus); +static DEVICE_ATTR_RO(die_cpus_list); + +define_siblings_show_func(package_cpus, core_cpumask); +static DEVICE_ATTR_RO(package_cpus); +static DEVICE_ATTR_RO(package_cpus_list); + +#ifdef CONFIG_SCHED_BOOK +define_id_show_func(book_id); +static DEVICE_ATTR_RO(book_id); +define_siblings_show_func(book_siblings, book_cpumask); +static DEVICE_ATTR_RO(book_siblings); +static DEVICE_ATTR_RO(book_siblings_list); +#endif + +#ifdef CONFIG_SCHED_DRAWER +define_id_show_func(drawer_id); +static DEVICE_ATTR_RO(drawer_id); +define_siblings_show_func(drawer_siblings, drawer_cpumask); +static DEVICE_ATTR_RO(drawer_siblings); +static DEVICE_ATTR_RO(drawer_siblings_list); +#endif + +static struct attribute *default_attrs[] = { + &dev_attr_physical_package_id.attr, + &dev_attr_die_id.attr, + &dev_attr_core_id.attr, + &dev_attr_thread_siblings.attr, + &dev_attr_thread_siblings_list.attr, + &dev_attr_core_cpus.attr, + &dev_attr_core_cpus_list.attr, + &dev_attr_core_siblings.attr, + &dev_attr_core_siblings_list.attr, + &dev_attr_die_cpus.attr, + &dev_attr_die_cpus_list.attr, + &dev_attr_package_cpus.attr, + &dev_attr_package_cpus_list.attr, +#ifdef CONFIG_SCHED_BOOK + &dev_attr_book_id.attr, + &dev_attr_book_siblings.attr, + &dev_attr_book_siblings_list.attr, +#endif +#ifdef CONFIG_SCHED_DRAWER + &dev_attr_drawer_id.attr, + &dev_attr_drawer_siblings.attr, + &dev_attr_drawer_siblings_list.attr, +#endif + NULL +}; + +static const struct attribute_group topology_attr_group = { + .attrs = default_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); |