diff options
Diffstat (limited to 'drivers/base/topology.c')
| -rw-r--r-- | drivers/base/topology.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c new file mode 100644 index 00000000..ae989c57 --- /dev/null +++ b/drivers/base/topology.c @@ -0,0 +1,196 @@ +/* + * 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/init.h> +#include <linux/mm.h> +#include <linux/cpu.h> +#include <linux/module.h> +#include <linux/hardirq.h> +#include <linux/topology.h> + +#define define_one_ro_named(_name, _func) \ + static DEVICE_ATTR(_name, 0444, _func, NULL) + +#define define_one_ro(_name) \ + static DEVICE_ATTR(_name, 0444, show_##_name, NULL) + +#define define_id_show_func(name) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + unsigned int cpu = dev->id; \ + return sprintf(buf, "%d\n", topology_##name(cpu)); \ +} + +#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \ + defined(topology_book_cpumask) +static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf) +{ + ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf; + int n = 0; + + if (len > 1) { + n = type? + cpulist_scnprintf(buf, len-2, mask) : + cpumask_scnprintf(buf, len-2, mask); + buf[n++] = '\n'; + buf[n] = '\0'; + } + return n; +} +#endif + +#ifdef arch_provides_topology_pointers +#define define_siblings_show_map(name) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + unsigned int cpu = dev->id; \ + return show_cpumap(0, topology_##name(cpu), buf); \ +} + +#define define_siblings_show_list(name) \ +static ssize_t show_##name##_list(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + unsigned int cpu = dev->id; \ + return show_cpumap(1, topology_##name(cpu), buf); \ +} + +#else +#define define_siblings_show_map(name) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + return show_cpumap(0, topology_##name(dev->id), buf); \ +} + +#define define_siblings_show_list(name) \ +static ssize_t show_##name##_list(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return show_cpumap(1, topology_##name(dev->id), buf); \ +} +#endif + +#define define_siblings_show_func(name) \ + define_siblings_show_map(name); define_siblings_show_list(name) + +define_id_show_func(physical_package_id); +define_one_ro(physical_package_id); + +define_id_show_func(core_id); +define_one_ro(core_id); + +define_siblings_show_func(thread_cpumask); +define_one_ro_named(thread_siblings, show_thread_cpumask); +define_one_ro_named(thread_siblings_list, show_thread_cpumask_list); + +define_siblings_show_func(core_cpumask); +define_one_ro_named(core_siblings, show_core_cpumask); +define_one_ro_named(core_siblings_list, show_core_cpumask_list); + +#ifdef CONFIG_SCHED_BOOK +define_id_show_func(book_id); +define_one_ro(book_id); +define_siblings_show_func(book_cpumask); +define_one_ro_named(book_siblings, show_book_cpumask); +define_one_ro_named(book_siblings_list, show_book_cpumask_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 __cpuinit topology_add_dev(unsigned int cpu) +{ + struct device *dev = get_cpu_device(cpu); + + return sysfs_create_group(&dev->kobj, &topology_attr_group); +} + +static void __cpuinit topology_remove_dev(unsigned int cpu) +{ + struct device *dev = get_cpu_device(cpu); + + sysfs_remove_group(&dev->kobj, &topology_attr_group); +} + +static int __cpuinit 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 __cpuinit topology_sysfs_init(void) +{ + int cpu; + int rc; + + for_each_online_cpu(cpu) { + rc = topology_add_dev(cpu); + if (rc) + return rc; + } + hotcpu_notifier(topology_cpu_callback, 0); + + return 0; +} + +device_initcall(topology_sysfs_init); |