diff options
Diffstat (limited to 'kernel/drivers/base/topology.c')
| -rw-r--r-- | kernel/drivers/base/topology.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/kernel/drivers/base/topology.c b/kernel/drivers/base/topology.c new file mode 100644 index 000000000..6491f4520 --- /dev/null +++ b/kernel/drivers/base/topology.c @@ -0,0 +1,155 @@ +/* + * driver/base/topology.c - Populate sysfs with cpu topology information + * + * Written by: Zhang Yanmin, Intel Corporation + * + * Copyright (C) 2006, Intel Corp. + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ +#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 sprintf(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(core_id); +static DEVICE_ATTR_RO(core_id); + +define_siblings_show_func(thread_siblings, thread_cpumask); +static DEVICE_ATTR_RO(thread_siblings); +static DEVICE_ATTR_RO(thread_siblings_list); + +define_siblings_show_func(core_siblings, core_cpumask); +static DEVICE_ATTR_RO(core_siblings); +static DEVICE_ATTR_RO(core_siblings_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 + +static struct attribute *default_attrs[] = { + &dev_attr_physical_package_id.attr, + &dev_attr_core_id.attr, + &dev_attr_thread_siblings.attr, + &dev_attr_thread_siblings_list.attr, + &dev_attr_core_siblings.attr, + &dev_attr_core_siblings_list.attr, +#ifdef CONFIG_SCHED_BOOK + &dev_attr_book_id.attr, + &dev_attr_book_siblings.attr, + &dev_attr_book_siblings_list.attr, +#endif + NULL +}; + +static 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 void topology_remove_dev(unsigned int cpu) +{ + struct device *dev = get_cpu_device(cpu); + + sysfs_remove_group(&dev->kobj, &topology_attr_group); +} + +static int topology_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long)hcpu; + int rc = 0; + + switch (action) { + case CPU_UP_PREPARE: + case CPU_UP_PREPARE_FROZEN: + rc = topology_add_dev(cpu); + break; + case CPU_UP_CANCELED: + case CPU_UP_CANCELED_FROZEN: + case CPU_DEAD: + case CPU_DEAD_FROZEN: + topology_remove_dev(cpu); + break; + } + return notifier_from_errno(rc); +} + +static int topology_sysfs_init(void) +{ + int cpu; + int rc = 0; + + cpu_notifier_register_begin(); + + for_each_online_cpu(cpu) { + rc = topology_add_dev(cpu); + if (rc) + goto out; + } + __hotcpu_notifier(topology_cpu_callback, 0); + +out: + cpu_notifier_register_done(); + return rc; +} + +device_initcall(topology_sysfs_init); |