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 44 si_meminfo_node(&i, nid); 45 46 n = sprintf(buf, "\n" 47 "Node %d MemTotal: %8lu kB\n" 48 "Node %d MemFree: %8lu kB\n" 49 "Node %d MemUsed: %8lu kB\n" 50 "Node %d Active: %8lu kB\n" 51 "Node %d Inactive: %8lu kB\n" 52 #ifdef CONFIG_HIGHMEM 53 "Node %d HighTotal: %8lu kB\n" 54 "Node %d HighFree: %8lu kB\n" 55 "Node %d LowTotal: %8lu kB\n" 56 "Node %d LowFree: %8lu kB\n" 57 #endif 58 "Node %d Dirty: %8lu kB\n" 59 "Node %d Writeback: %8lu kB\n" 60 "Node %d FilePages: %8lu kB\n" 61 "Node %d Mapped: %8lu kB\n" 62 "Node %d AnonPages: %8lu kB\n" 63 "Node %d PageTables: %8lu kB\n" 64 "Node %d NFS_Unstable: %8lu kB\n" 65 "Node %d Bounce: %8lu kB\n" 66 "Node %d Slab: %8lu kB\n" 67 "Node %d SReclaimable: %8lu kB\n" 68 "Node %d SUnreclaim: %8lu kB\n", 69 nid, K(i.totalram), 70 nid, K(i.freeram), 71 nid, K(i.totalram - i.freeram), 72 nid, node_page_state(nid, NR_ACTIVE), 73 nid, node_page_state(nid, NR_INACTIVE), 74 #ifdef CONFIG_HIGHMEM 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 #endif 80 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 81 nid, K(node_page_state(nid, NR_WRITEBACK)), 82 nid, K(node_page_state(nid, NR_FILE_PAGES)), 83 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 84 nid, K(node_page_state(nid, NR_ANON_PAGES)), 85 nid, K(node_page_state(nid, NR_PAGETABLE)), 86 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 87 nid, K(node_page_state(nid, NR_BOUNCE)), 88 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 89 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 90 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 91 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 92 n += hugetlb_report_node_meminfo(nid, buf + n); 93 return n; 94 } 95 96 #undef K 97 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 98 99 static ssize_t node_read_numastat(struct sys_device * dev, char * buf) 100 { 101 return sprintf(buf, 102 "numa_hit %lu\n" 103 "numa_miss %lu\n" 104 "numa_foreign %lu\n" 105 "interleave_hit %lu\n" 106 "local_node %lu\n" 107 "other_node %lu\n", 108 node_page_state(dev->id, NUMA_HIT), 109 node_page_state(dev->id, NUMA_MISS), 110 node_page_state(dev->id, NUMA_FOREIGN), 111 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 112 node_page_state(dev->id, NUMA_LOCAL), 113 node_page_state(dev->id, NUMA_OTHER)); 114 } 115 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 116 117 static ssize_t node_read_distance(struct sys_device * dev, char * buf) 118 { 119 int nid = dev->id; 120 int len = 0; 121 int i; 122 123 /* buf currently PAGE_SIZE, need ~4 chars per node */ 124 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); 125 126 for_each_online_node(i) 127 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 128 129 len += sprintf(buf + len, "\n"); 130 return len; 131 } 132 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 133 134 135 /* 136 * register_node - Setup a sysfs device for a node. 137 * @num - Node number to use when creating the device. 138 * 139 * Initialize and register the node device. 140 */ 141 int register_node(struct node *node, int num, struct node *parent) 142 { 143 int error; 144 145 node->sysdev.id = num; 146 node->sysdev.cls = &node_class; 147 error = sysdev_register(&node->sysdev); 148 149 if (!error){ 150 sysdev_create_file(&node->sysdev, &attr_cpumap); 151 sysdev_create_file(&node->sysdev, &attr_meminfo); 152 sysdev_create_file(&node->sysdev, &attr_numastat); 153 sysdev_create_file(&node->sysdev, &attr_distance); 154 } 155 return error; 156 } 157 158 /** 159 * unregister_node - unregister a node device 160 * @node: node going away 161 * 162 * Unregisters a node device @node. All the devices on the node must be 163 * unregistered before calling this function. 164 */ 165 void unregister_node(struct node *node) 166 { 167 sysdev_remove_file(&node->sysdev, &attr_cpumap); 168 sysdev_remove_file(&node->sysdev, &attr_meminfo); 169 sysdev_remove_file(&node->sysdev, &attr_numastat); 170 sysdev_remove_file(&node->sysdev, &attr_distance); 171 172 sysdev_unregister(&node->sysdev); 173 } 174 175 struct node node_devices[MAX_NUMNODES]; 176 177 /* 178 * register cpu under node 179 */ 180 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 181 { 182 if (node_online(nid)) { 183 struct sys_device *obj = get_cpu_sysdev(cpu); 184 if (!obj) 185 return 0; 186 return sysfs_create_link(&node_devices[nid].sysdev.kobj, 187 &obj->kobj, 188 kobject_name(&obj->kobj)); 189 } 190 191 return 0; 192 } 193 194 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 195 { 196 if (node_online(nid)) { 197 struct sys_device *obj = get_cpu_sysdev(cpu); 198 if (obj) 199 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 200 kobject_name(&obj->kobj)); 201 } 202 return 0; 203 } 204 205 int register_one_node(int nid) 206 { 207 int error = 0; 208 int cpu; 209 210 if (node_online(nid)) { 211 int p_node = parent_node(nid); 212 struct node *parent = NULL; 213 214 if (p_node != nid) 215 parent = &node_devices[p_node]; 216 217 error = register_node(&node_devices[nid], nid, parent); 218 219 /* link cpu under this node */ 220 for_each_present_cpu(cpu) { 221 if (cpu_to_node(cpu) == nid) 222 register_cpu_under_node(cpu, nid); 223 } 224 } 225 226 return error; 227 228 } 229 230 void unregister_one_node(int nid) 231 { 232 unregister_node(&node_devices[nid]); 233 } 234 235 static int __init register_node_type(void) 236 { 237 return sysdev_class_register(&node_class); 238 } 239 postcore_initcall(register_node_type); 240