![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>
207 lines
4.6 KiB
C
207 lines
4.6 KiB
C
/*
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* drivers/base/cpu.c - basic CPU class support
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*/
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#include <linux/sysdev.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/cpu.h>
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#include <linux/topology.h>
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#include <linux/device.h>
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#include <linux/node.h>
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#include "base.h"
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struct sysdev_class cpu_sysdev_class = {
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.name = "cpu",
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};
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EXPORT_SYMBOL(cpu_sysdev_class);
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static DEFINE_PER_CPU(struct sys_device *, cpu_sys_devices);
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#ifdef CONFIG_HOTPLUG_CPU
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static ssize_t show_online(struct sys_device *dev, struct sysdev_attribute *attr,
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char *buf)
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{
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struct cpu *cpu = container_of(dev, struct cpu, sysdev);
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return sprintf(buf, "%u\n", !!cpu_online(cpu->sysdev.id));
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}
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static ssize_t __ref store_online(struct sys_device *dev, struct sysdev_attribute *attr,
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const char *buf, size_t count)
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{
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struct cpu *cpu = container_of(dev, struct cpu, sysdev);
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ssize_t ret;
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switch (buf[0]) {
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case '0':
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ret = cpu_down(cpu->sysdev.id);
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if (!ret)
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kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
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break;
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case '1':
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ret = cpu_up(cpu->sysdev.id);
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if (!ret)
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kobject_uevent(&dev->kobj, KOBJ_ONLINE);
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break;
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default:
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ret = -EINVAL;
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}
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if (ret >= 0)
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ret = count;
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return ret;
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}
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static SYSDEV_ATTR(online, 0644, show_online, store_online);
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static void __cpuinit register_cpu_control(struct cpu *cpu)
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{
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sysdev_create_file(&cpu->sysdev, &attr_online);
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}
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void unregister_cpu(struct cpu *cpu)
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{
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int logical_cpu = cpu->sysdev.id;
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unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
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sysdev_remove_file(&cpu->sysdev, &attr_online);
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sysdev_unregister(&cpu->sysdev);
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per_cpu(cpu_sys_devices, logical_cpu) = NULL;
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return;
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}
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#else /* ... !CONFIG_HOTPLUG_CPU */
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static inline void register_cpu_control(struct cpu *cpu)
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{
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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#ifdef CONFIG_KEXEC
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#include <linux/kexec.h>
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static ssize_t show_crash_notes(struct sys_device *dev, struct sysdev_attribute *attr,
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char *buf)
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{
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struct cpu *cpu = container_of(dev, struct cpu, sysdev);
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ssize_t rc;
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unsigned long long addr;
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int cpunum;
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cpunum = cpu->sysdev.id;
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/*
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* Might be reading other cpu's data based on which cpu read thread
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* has been scheduled. But cpu data (memory) is allocated once during
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* boot up and this data does not change there after. Hence this
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* operation should be safe. No locking required.
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*/
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addr = __pa(per_cpu_ptr(crash_notes, cpunum));
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rc = sprintf(buf, "%Lx\n", addr);
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return rc;
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}
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static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL);
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#endif
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/*
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* Print cpu online, possible, present, and system maps
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*/
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static ssize_t print_cpus_map(char *buf, cpumask_t *map)
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{
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int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *map);
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buf[n++] = '\n';
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buf[n] = '\0';
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return n;
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}
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#define print_cpus_func(type) \
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static ssize_t print_cpus_##type(struct sysdev_class *class, char *buf) \
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{ \
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return print_cpus_map(buf, &cpu_##type##_map); \
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} \
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struct sysdev_class_attribute attr_##type##_map = \
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_SYSDEV_CLASS_ATTR(type, 0444, print_cpus_##type, NULL)
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print_cpus_func(online);
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print_cpus_func(possible);
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print_cpus_func(present);
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struct sysdev_class_attribute *cpu_state_attr[] = {
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&attr_online_map,
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&attr_possible_map,
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&attr_present_map,
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};
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static int cpu_states_init(void)
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{
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int i;
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int err = 0;
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for (i = 0; i < ARRAY_SIZE(cpu_state_attr); i++) {
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int ret;
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ret = sysdev_class_create_file(&cpu_sysdev_class,
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cpu_state_attr[i]);
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if (!err)
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err = ret;
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}
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return err;
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}
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/*
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* register_cpu - Setup a sysfs device for a CPU.
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* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
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* sysfs for this CPU.
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* @num - CPU number to use when creating the device.
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*
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* Initialize and register the CPU device.
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*/
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int __cpuinit register_cpu(struct cpu *cpu, int num)
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{
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int error;
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cpu->node_id = cpu_to_node(num);
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cpu->sysdev.id = num;
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cpu->sysdev.cls = &cpu_sysdev_class;
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error = sysdev_register(&cpu->sysdev);
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if (!error && cpu->hotpluggable)
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register_cpu_control(cpu);
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if (!error)
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per_cpu(cpu_sys_devices, num) = &cpu->sysdev;
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if (!error)
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register_cpu_under_node(num, cpu_to_node(num));
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#ifdef CONFIG_KEXEC
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if (!error)
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error = sysdev_create_file(&cpu->sysdev, &attr_crash_notes);
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#endif
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return error;
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}
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struct sys_device *get_cpu_sysdev(unsigned cpu)
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{
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if (cpu < nr_cpu_ids && cpu_possible(cpu))
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return per_cpu(cpu_sys_devices, cpu);
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else
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return NULL;
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}
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EXPORT_SYMBOL_GPL(get_cpu_sysdev);
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int __init cpu_dev_init(void)
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{
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int err;
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err = sysdev_class_register(&cpu_sysdev_class);
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if (!err)
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err = cpu_states_init();
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#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
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if (!err)
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err = sched_create_sysfs_power_savings_entries(&cpu_sysdev_class);
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#endif
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return err;
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}
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