1 /* 2 * drivers/base/node.c - basic Node class support 3 */ 4 5 #include <linux/sysdev.h> 6 #include <linux/module.h> 7 #include <linux/init.h> 8 #include <linux/mm.h> 9 #include <linux/node.h> 10 #include <linux/hugetlb.h> 11 #include <linux/cpumask.h> 12 #include <linux/topology.h> 13 #include <linux/nodemask.h> 14 #include <linux/cpu.h> 15 16 static struct sysdev_class node_class = { 17 set_kset_name("node"), 18 }; 19 20 21 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf) 22 { 23 struct node *node_dev = to_node(dev); 24 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id); 25 int len; 26 27 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */ 28 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2); 29 30 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask); 31 len += sprintf(buf + len, "\n"); 32 return len; 33 } 34 35 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL); 36 37 #define K(x) ((x) << (PAGE_SHIFT - 10)) 38 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf) 39 { 40 int n; 41 int nid = dev->id; 42 struct sysinfo i; 43 unsigned long inactive; 44 unsigned long active; 45 unsigned long free; 46 47 si_meminfo_node(&i, nid); 48 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid)); 49 50 51 n = sprintf(buf, "\n" 52 "Node %d MemTotal: %8lu kB\n" 53 "Node %d MemFree: %8lu kB\n" 54 "Node %d MemUsed: %8lu kB\n" 55 "Node %d Active: %8lu kB\n" 56 "Node %d Inactive: %8lu kB\n" 57 "Node %d HighTotal: %8lu kB\n" 58 "Node %d HighFree: %8lu kB\n" 59 "Node %d LowTotal: %8lu kB\n" 60 "Node %d LowFree: %8lu kB\n" 61 "Node %d Dirty: %8lu kB\n" 62 "Node %d Writeback: %8lu kB\n" 63 "Node %d FilePages: %8lu kB\n" 64 "Node %d Mapped: %8lu kB\n" 65 "Node %d AnonPages: %8lu kB\n" 66 "Node %d PageTables: %8lu kB\n" 67 "Node %d NFS_Unstable: %8lu kB\n" 68 "Node %d Bounce: %8lu kB\n" 69 "Node %d Slab: %8lu kB\n", 70 nid, K(i.totalram), 71 nid, K(i.freeram), 72 nid, K(i.totalram - i.freeram), 73 nid, K(active), 74 nid, K(inactive), 75 nid, K(i.totalhigh), 76 nid, K(i.freehigh), 77 nid, K(i.totalram - i.totalhigh), 78 nid, K(i.freeram - i.freehigh), 79 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 80 nid, K(node_page_state(nid, NR_WRITEBACK)), 81 nid, K(node_page_state(nid, NR_FILE_PAGES)), 82 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 83 nid, K(node_page_state(nid, NR_ANON_PAGES)), 84 nid, K(node_page_state(nid, NR_PAGETABLE)), 85 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 86 nid, K(node_page_state(nid, NR_BOUNCE)), 87 nid, K(node_page_state(nid, NR_SLAB))); 88 n += hugetlb_report_node_meminfo(nid, buf + n); 89 return n; 90 } 91 92 #undef K 93 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 94 95 static ssize_t node_read_numastat(struct sys_device * dev, char * buf) 96 { 97 return sprintf(buf, 98 "numa_hit %lu\n" 99 "numa_miss %lu\n" 100 "numa_foreign %lu\n" 101 "interleave_hit %lu\n" 102 "local_node %lu\n" 103 "other_node %lu\n", 104 node_page_state(dev->id, NUMA_HIT), 105 node_page_state(dev->id, NUMA_MISS), 106 node_page_state(dev->id, NUMA_FOREIGN), 107 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 108 node_page_state(dev->id, NUMA_LOCAL), 109 node_page_state(dev->id, NUMA_OTHER)); 110 } 111 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 112 113 static ssize_t node_read_distance(struct sys_device * dev, char * buf) 114 { 115 int nid = dev->id; 116 int len = 0; 117 int i; 118 119 /* buf currently PAGE_SIZE, need ~4 chars per node */ 120 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); 121 122 for_each_online_node(i) 123 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 124 125 len += sprintf(buf + len, "\n"); 126 return len; 127 } 128 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 129 130 131 /* 132 * register_node - Setup a driverfs device for a node. 133 * @num - Node number to use when creating the device. 134 * 135 * Initialize and register the node device. 136 */ 137 int register_node(struct node *node, int num, struct node *parent) 138 { 139 int error; 140 141 node->sysdev.id = num; 142 node->sysdev.cls = &node_class; 143 error = sysdev_register(&node->sysdev); 144 145 if (!error){ 146 sysdev_create_file(&node->sysdev, &attr_cpumap); 147 sysdev_create_file(&node->sysdev, &attr_meminfo); 148 sysdev_create_file(&node->sysdev, &attr_numastat); 149 sysdev_create_file(&node->sysdev, &attr_distance); 150 } 151 return error; 152 } 153 154 /** 155 * unregister_node - unregister a node device 156 * @node: node going away 157 * 158 * Unregisters a node device @node. All the devices on the node must be 159 * unregistered before calling this function. 160 */ 161 void unregister_node(struct node *node) 162 { 163 sysdev_remove_file(&node->sysdev, &attr_cpumap); 164 sysdev_remove_file(&node->sysdev, &attr_meminfo); 165 sysdev_remove_file(&node->sysdev, &attr_numastat); 166 sysdev_remove_file(&node->sysdev, &attr_distance); 167 168 sysdev_unregister(&node->sysdev); 169 } 170 171 struct node node_devices[MAX_NUMNODES]; 172 173 /* 174 * register cpu under node 175 */ 176 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 177 { 178 if (node_online(nid)) { 179 struct sys_device *obj = get_cpu_sysdev(cpu); 180 if (!obj) 181 return 0; 182 return sysfs_create_link(&node_devices[nid].sysdev.kobj, 183 &obj->kobj, 184 kobject_name(&obj->kobj)); 185 } 186 187 return 0; 188 } 189 190 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 191 { 192 if (node_online(nid)) { 193 struct sys_device *obj = get_cpu_sysdev(cpu); 194 if (obj) 195 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 196 kobject_name(&obj->kobj)); 197 } 198 return 0; 199 } 200 201 int register_one_node(int nid) 202 { 203 int error = 0; 204 int cpu; 205 206 if (node_online(nid)) { 207 int p_node = parent_node(nid); 208 struct node *parent = NULL; 209 210 if (p_node != nid) 211 parent = &node_devices[p_node]; 212 213 error = register_node(&node_devices[nid], nid, parent); 214 215 /* link cpu under this node */ 216 for_each_present_cpu(cpu) { 217 if (cpu_to_node(cpu) == nid) 218 register_cpu_under_node(cpu, nid); 219 } 220 } 221 222 return error; 223 224 } 225 226 void unregister_one_node(int nid) 227 { 228 unregister_node(&node_devices[nid]); 229 } 230 231 static int __init register_node_type(void) 232 { 233 return sysdev_class_register(&node_class); 234 } 235 postcore_initcall(register_node_type); 236