diff options
Diffstat (limited to 'drivers/base/cpu.c')
| -rw-r--r-- | drivers/base/cpu.c | 85 |
1 files changed, 66 insertions, 19 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 848ebbd2571..006b1bc5297 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -15,6 +15,7 @@ #include <linux/percpu.h> #include <linux/acpi.h> #include <linux/of.h> +#include <linux/cpufeature.h> #include "base.h" @@ -44,13 +45,11 @@ static int __ref cpu_subsys_online(struct device *dev) struct cpu *cpu = container_of(dev, struct cpu, dev); int cpuid = dev->id; int from_nid, to_nid; - int ret = -ENODEV; - - cpu_hotplug_driver_lock(); + int ret; from_nid = cpu_to_node(cpuid); if (from_nid == NUMA_NO_NODE) - goto out; + return -ENODEV; ret = cpu_up(cpuid); /* @@ -61,19 +60,12 @@ static int __ref cpu_subsys_online(struct device *dev) if (from_nid != to_nid) change_cpu_under_node(cpu, from_nid, to_nid); - out: - cpu_hotplug_driver_unlock(); return ret; } static int cpu_subsys_offline(struct device *dev) { - int ret; - - cpu_hotplug_driver_lock(); - ret = cpu_down(dev->id); - cpu_hotplug_driver_unlock(); - return ret; + return cpu_down(dev->id); } void unregister_cpu(struct cpu *cpu) @@ -93,7 +85,17 @@ static ssize_t cpu_probe_store(struct device *dev, const char *buf, size_t count) { - return arch_cpu_probe(buf, count); + ssize_t cnt; + int ret; + + ret = lock_device_hotplug_sysfs(); + if (ret) + return ret; + + cnt = arch_cpu_probe(buf, count); + + unlock_device_hotplug(); + return cnt; } static ssize_t cpu_release_store(struct device *dev, @@ -101,7 +103,17 @@ static ssize_t cpu_release_store(struct device *dev, const char *buf, size_t count) { - return arch_cpu_release(buf, count); + ssize_t cnt; + int ret; + + ret = lock_device_hotplug_sysfs(); + if (ret) + return ret; + + cnt = arch_cpu_release(buf, count); + + unlock_device_hotplug(); + return cnt; } static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store); @@ -275,6 +287,41 @@ static void cpu_device_release(struct device *dev) */ } +#ifdef CONFIG_GENERIC_CPU_AUTOPROBE +static ssize_t print_cpu_modalias(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + ssize_t n; + u32 i; + + n = sprintf(buf, "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:", + CPU_FEATURE_TYPEVAL); + + for (i = 0; i < MAX_CPU_FEATURES; i++) + if (cpu_have_feature(i)) { + if (PAGE_SIZE < n + sizeof(",XXXX\n")) { + WARN(1, "CPU features overflow page\n"); + break; + } + n += sprintf(&buf[n], ",%04X", i); + } + buf[n++] = '\n'; + return n; +} + +static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); + if (buf) { + print_cpu_modalias(NULL, NULL, buf); + add_uevent_var(env, "MODALIAS=%s", buf); + kfree(buf); + } + return 0; +} +#endif + /* * register_cpu - Setup a sysfs device for a CPU. * @cpu - cpu->hotpluggable field set to 1 will generate a control file in @@ -295,8 +342,8 @@ int register_cpu(struct cpu *cpu, int num) cpu->dev.offline_disabled = !cpu->hotpluggable; cpu->dev.offline = !cpu_online(num); cpu->dev.of_node = of_get_cpu_node(num, NULL); -#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE - cpu->dev.bus->uevent = arch_cpu_uevent; +#ifdef CONFIG_GENERIC_CPU_AUTOPROBE + cpu->dev.bus->uevent = cpu_uevent; #endif cpu->dev.groups = common_cpu_attr_groups; if (cpu->hotpluggable) @@ -319,8 +366,8 @@ struct device *get_cpu_device(unsigned cpu) } EXPORT_SYMBOL_GPL(get_cpu_device); -#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE -static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL); +#ifdef CONFIG_GENERIC_CPU_AUTOPROBE +static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL); #endif static struct attribute *cpu_root_attrs[] = { @@ -333,7 +380,7 @@ static struct attribute *cpu_root_attrs[] = { &cpu_attrs[2].attr.attr, &dev_attr_kernel_max.attr, &dev_attr_offline.attr, -#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE +#ifdef CONFIG_GENERIC_CPU_AUTOPROBE &dev_attr_modalias.attr, #endif NULL |