![Andi Kleen](/assets/img/avatar_default.png)
This allow to dynamically generate attributes and share show/store functions between attributes. Right now most attributes are generated by special macros and lots of duplicated code. With the attribute passed it's instead possible to attach some data to the attribute and then use that in shared low level functions to do different things. I need this for the dynamically generated bank attributes in the x86 machine check code, but it'll allow some further cleanups. I converted all users in tree to the new show/store prototype. It's a single huge patch to avoid unbisectable sections. Runtime tested: x86-32, x86-64 Compiled only: ia64, powerpc Not compile tested/only grep converted: sh, arm, avr32 Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
184 lines
4.8 KiB
C
184 lines
4.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/sysdev.h>
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#include <linux/init.h>
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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/topology.h>
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#define define_one_ro(_name) \
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static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
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#define define_id_show_func(name) \
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static ssize_t show_##name(struct sys_device *dev, \
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struct sysdev_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return sprintf(buf, "%d\n", topology_##name(cpu)); \
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}
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#if defined(topology_thread_siblings) || defined(topology_core_siblings)
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static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf)
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{
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ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
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int n = 0;
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if (len > 1) {
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n = type?
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cpulist_scnprintf(buf, len-2, *mask):
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cpumask_scnprintf(buf, len-2, *mask);
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buf[n++] = '\n';
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buf[n] = '\0';
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}
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return n;
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}
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#endif
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#ifdef arch_provides_topology_pointers
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#define define_siblings_show_map(name) \
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static ssize_t show_##name(struct sys_device *dev, \
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struct sysdev_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return show_cpumap(0, &(topology_##name(cpu)), buf); \
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}
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#define define_siblings_show_list(name) \
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static ssize_t show_##name##_list(struct sys_device *dev, \
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struct sysdev_attribute *attr, \
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char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return show_cpumap(1, &(topology_##name(cpu)), buf); \
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}
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#else
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#define define_siblings_show_map(name) \
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static ssize_t show_##name(struct sys_device *dev, \
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struct sysdev_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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cpumask_t mask = topology_##name(cpu); \
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return show_cpumap(0, &mask, buf); \
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}
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#define define_siblings_show_list(name) \
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static ssize_t show_##name##_list(struct sys_device *dev, \
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struct sysdev_attribute *attr, \
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char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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cpumask_t mask = topology_##name(cpu); \
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return show_cpumap(1, &mask, buf); \
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}
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#endif
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#define define_siblings_show_func(name) \
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define_siblings_show_map(name); define_siblings_show_list(name)
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define_id_show_func(physical_package_id);
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define_one_ro(physical_package_id);
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define_id_show_func(core_id);
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define_one_ro(core_id);
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define_siblings_show_func(thread_siblings);
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define_one_ro(thread_siblings);
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define_one_ro(thread_siblings_list);
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define_siblings_show_func(core_siblings);
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define_one_ro(core_siblings);
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define_one_ro(core_siblings_list);
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static struct attribute *default_attrs[] = {
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&attr_physical_package_id.attr,
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&attr_core_id.attr,
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&attr_thread_siblings.attr,
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&attr_thread_siblings_list.attr,
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&attr_core_siblings.attr,
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&attr_core_siblings_list.attr,
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NULL
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};
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static struct attribute_group topology_attr_group = {
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.attrs = default_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 __cpuinit topology_add_dev(unsigned int cpu)
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{
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struct sys_device *sys_dev = get_cpu_sysdev(cpu);
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return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
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}
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static void __cpuinit topology_remove_dev(unsigned int cpu)
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{
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struct sys_device *sys_dev = get_cpu_sysdev(cpu);
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sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
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}
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static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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int rc = 0;
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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rc = topology_add_dev(cpu);
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break;
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case CPU_UP_CANCELED:
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case CPU_UP_CANCELED_FROZEN:
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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topology_remove_dev(cpu);
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break;
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}
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return rc ? NOTIFY_BAD : NOTIFY_OK;
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}
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static int __cpuinit topology_sysfs_init(void)
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{
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int cpu;
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int rc;
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for_each_online_cpu(cpu) {
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rc = topology_add_dev(cpu);
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if (rc)
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return rc;
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}
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hotcpu_notifier(topology_cpu_callback, 0);
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return 0;
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}
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device_initcall(topology_sysfs_init);
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