diff options
| -rw-r--r-- | drivers/base/node.c | 91 |
1 files changed, 90 insertions, 1 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c index cae346ef1b2..88eeed72b5d 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -12,6 +12,7 @@ #include <linux/topology.h> #include <linux/nodemask.h> #include <linux/cpu.h> +#include <linux/device.h> static struct sysdev_class node_class = { set_kset_name("node"), @@ -232,8 +233,96 @@ void unregister_one_node(int nid) unregister_node(&node_devices[nid]); } +/* + * node states attributes + */ + +static ssize_t print_nodes_state(enum node_states state, char *buf) +{ + int n; + + n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); + if (n > 0 && PAGE_SIZE > n + 1) { + *(buf + n++) = '\n'; + *(buf + n++) = '\0'; + } + return n; +} + +static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf) +{ + return print_nodes_state(N_POSSIBLE, buf); +} + +static ssize_t print_nodes_online(struct sysdev_class *class, char *buf) +{ + return print_nodes_state(N_ONLINE, buf); +} + +static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class, + char *buf) +{ + return print_nodes_state(N_NORMAL_MEMORY, buf); +} + +static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf) +{ + return print_nodes_state(N_CPU, buf); +} + +static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL); +static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL); +static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory, + NULL); +static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL); + +#ifdef CONFIG_HIGHMEM +static ssize_t print_nodes_has_high_memory(struct sysdev_class *class, + char *buf) +{ + return print_nodes_state(N_HIGH_MEMORY, buf); +} + +static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory, + NULL); +#endif + +struct sysdev_class_attribute *node_state_attr[] = { + &attr_possible, + &attr_online, + &attr_has_normal_memory, +#ifdef CONFIG_HIGHMEM + &attr_has_high_memory, +#endif + &attr_has_cpu, +}; + +static int node_states_init(void) +{ + int i; + int err = 0; + + for (i = 0; i < NR_NODE_STATES; i++) { + int ret; + ret = sysdev_class_create_file(&node_class, node_state_attr[i]); + if (!err) + err = ret; + } + return err; +} + static int __init register_node_type(void) { - return sysdev_class_register(&node_class); + int ret; + + ret = sysdev_class_register(&node_class); + if (!ret) + ret = node_states_init(); + + /* + * Note: we're not going to unregister the node class if we fail + * to register the node state class attribute files. + */ + return ret; } postcore_initcall(register_node_type); |