1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * This file contains NUMA specific variables and functions which can 7 * be split away from DISCONTIGMEM and are used on NUMA machines with 8 * contiguous memory. 9 * 2002/08/07 Erich Focht <efocht@ess.nec.de> 10 * Populate cpu entries in sysfs for non-numa systems as well 11 * Intel Corporation - Ashok Raj 12 * 02/27/2006 Zhang, Yanmin 13 * Populate cpu cache entries in sysfs for cpu cache info 14 */ 15 16 #include <linux/cpu.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/node.h> 20 #include <linux/init.h> 21 #include <linux/bootmem.h> 22 #include <linux/nodemask.h> 23 #include <linux/notifier.h> 24 #include <asm/mmzone.h> 25 #include <asm/numa.h> 26 #include <asm/cpu.h> 27 28 static struct ia64_cpu *sysfs_cpus; 29 30 void arch_fix_phys_package_id(int num, u32 slot) 31 { 32 #ifdef CONFIG_SMP 33 if (cpu_data(num)->socket_id == -1) 34 cpu_data(num)->socket_id = slot; 35 #endif 36 } 37 EXPORT_SYMBOL_GPL(arch_fix_phys_package_id); 38 39 40 #ifdef CONFIG_HOTPLUG_CPU 41 int __ref arch_register_cpu(int num) 42 { 43 #ifdef CONFIG_ACPI 44 /* 45 * If CPEI can be re-targetted or if this is not 46 * CPEI target, then it is hotpluggable 47 */ 48 if (can_cpei_retarget() || !is_cpu_cpei_target(num)) 49 sysfs_cpus[num].cpu.hotpluggable = 1; 50 map_cpu_to_node(num, node_cpuid[num].nid); 51 #endif 52 return register_cpu(&sysfs_cpus[num].cpu, num); 53 } 54 EXPORT_SYMBOL(arch_register_cpu); 55 56 void __ref arch_unregister_cpu(int num) 57 { 58 unregister_cpu(&sysfs_cpus[num].cpu); 59 #ifdef CONFIG_ACPI 60 unmap_cpu_from_node(num, cpu_to_node(num)); 61 #endif 62 } 63 EXPORT_SYMBOL(arch_unregister_cpu); 64 #else 65 static int __init arch_register_cpu(int num) 66 { 67 return register_cpu(&sysfs_cpus[num].cpu, num); 68 } 69 #endif /*CONFIG_HOTPLUG_CPU*/ 70 71 72 static int __init topology_init(void) 73 { 74 int i, err = 0; 75 76 #ifdef CONFIG_NUMA 77 /* 78 * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes? 79 */ 80 for_each_online_node(i) { 81 if ((err = register_one_node(i))) 82 goto out; 83 } 84 #endif 85 86 sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL); 87 if (!sysfs_cpus) 88 panic("kzalloc in topology_init failed - NR_CPUS too big?"); 89 90 for_each_present_cpu(i) { 91 if((err = arch_register_cpu(i))) 92 goto out; 93 } 94 out: 95 return err; 96 } 97 98 subsys_initcall(topology_init); 99 100 101 /* 102 * Export cpu cache information through sysfs 103 */ 104 105 /* 106 * A bunch of string array to get pretty printing 107 */ 108 static const char *cache_types[] = { 109 "", /* not used */ 110 "Instruction", 111 "Data", 112 "Unified" /* unified */ 113 }; 114 115 static const char *cache_mattrib[]={ 116 "WriteThrough", 117 "WriteBack", 118 "", /* reserved */ 119 "" /* reserved */ 120 }; 121 122 struct cache_info { 123 pal_cache_config_info_t cci; 124 cpumask_t shared_cpu_map; 125 int level; 126 int type; 127 struct kobject kobj; 128 }; 129 130 struct cpu_cache_info { 131 struct cache_info *cache_leaves; 132 int num_cache_leaves; 133 struct kobject kobj; 134 }; 135 136 static struct cpu_cache_info all_cpu_cache_info[NR_CPUS] __cpuinitdata; 137 #define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y]) 138 139 #ifdef CONFIG_SMP 140 static void __cpuinit cache_shared_cpu_map_setup( unsigned int cpu, 141 struct cache_info * this_leaf) 142 { 143 pal_cache_shared_info_t csi; 144 int num_shared, i = 0; 145 unsigned int j; 146 147 if (cpu_data(cpu)->threads_per_core <= 1 && 148 cpu_data(cpu)->cores_per_socket <= 1) { 149 cpu_set(cpu, this_leaf->shared_cpu_map); 150 return; 151 } 152 153 if (ia64_pal_cache_shared_info(this_leaf->level, 154 this_leaf->type, 155 0, 156 &csi) != PAL_STATUS_SUCCESS) 157 return; 158 159 num_shared = (int) csi.num_shared; 160 do { 161 for_each_possible_cpu(j) 162 if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id 163 && cpu_data(j)->core_id == csi.log1_cid 164 && cpu_data(j)->thread_id == csi.log1_tid) 165 cpu_set(j, this_leaf->shared_cpu_map); 166 167 i++; 168 } while (i < num_shared && 169 ia64_pal_cache_shared_info(this_leaf->level, 170 this_leaf->type, 171 i, 172 &csi) == PAL_STATUS_SUCCESS); 173 } 174 #else 175 static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, 176 struct cache_info * this_leaf) 177 { 178 cpu_set(cpu, this_leaf->shared_cpu_map); 179 return; 180 } 181 #endif 182 183 static ssize_t show_coherency_line_size(struct cache_info *this_leaf, 184 char *buf) 185 { 186 return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size); 187 } 188 189 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf, 190 char *buf) 191 { 192 return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc); 193 } 194 195 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf) 196 { 197 return sprintf(buf, 198 "%s\n", 199 cache_mattrib[this_leaf->cci.pcci_cache_attr]); 200 } 201 202 static ssize_t show_size(struct cache_info *this_leaf, char *buf) 203 { 204 return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024); 205 } 206 207 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf) 208 { 209 unsigned number_of_sets = this_leaf->cci.pcci_cache_size; 210 number_of_sets /= this_leaf->cci.pcci_assoc; 211 number_of_sets /= 1 << this_leaf->cci.pcci_line_size; 212 213 return sprintf(buf, "%u\n", number_of_sets); 214 } 215 216 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf) 217 { 218 ssize_t len; 219 cpumask_t shared_cpu_map; 220 221 cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map); 222 len = cpumask_scnprintf(buf, NR_CPUS+1, &shared_cpu_map); 223 len += sprintf(buf+len, "\n"); 224 return len; 225 } 226 227 static ssize_t show_type(struct cache_info *this_leaf, char *buf) 228 { 229 int type = this_leaf->type + this_leaf->cci.pcci_unified; 230 return sprintf(buf, "%s\n", cache_types[type]); 231 } 232 233 static ssize_t show_level(struct cache_info *this_leaf, char *buf) 234 { 235 return sprintf(buf, "%u\n", this_leaf->level); 236 } 237 238 struct cache_attr { 239 struct attribute attr; 240 ssize_t (*show)(struct cache_info *, char *); 241 ssize_t (*store)(struct cache_info *, const char *, size_t count); 242 }; 243 244 #ifdef define_one_ro 245 #undef define_one_ro 246 #endif 247 #define define_one_ro(_name) \ 248 static struct cache_attr _name = \ 249 __ATTR(_name, 0444, show_##_name, NULL) 250 251 define_one_ro(level); 252 define_one_ro(type); 253 define_one_ro(coherency_line_size); 254 define_one_ro(ways_of_associativity); 255 define_one_ro(size); 256 define_one_ro(number_of_sets); 257 define_one_ro(shared_cpu_map); 258 define_one_ro(attributes); 259 260 static struct attribute * cache_default_attrs[] = { 261 &type.attr, 262 &level.attr, 263 &coherency_line_size.attr, 264 &ways_of_associativity.attr, 265 &attributes.attr, 266 &size.attr, 267 &number_of_sets.attr, 268 &shared_cpu_map.attr, 269 NULL 270 }; 271 272 #define to_object(k) container_of(k, struct cache_info, kobj) 273 #define to_attr(a) container_of(a, struct cache_attr, attr) 274 275 static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf) 276 { 277 struct cache_attr *fattr = to_attr(attr); 278 struct cache_info *this_leaf = to_object(kobj); 279 ssize_t ret; 280 281 ret = fattr->show ? fattr->show(this_leaf, buf) : 0; 282 return ret; 283 } 284 285 static struct sysfs_ops cache_sysfs_ops = { 286 .show = cache_show 287 }; 288 289 static struct kobj_type cache_ktype = { 290 .sysfs_ops = &cache_sysfs_ops, 291 .default_attrs = cache_default_attrs, 292 }; 293 294 static struct kobj_type cache_ktype_percpu_entry = { 295 .sysfs_ops = &cache_sysfs_ops, 296 }; 297 298 static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu) 299 { 300 kfree(all_cpu_cache_info[cpu].cache_leaves); 301 all_cpu_cache_info[cpu].cache_leaves = NULL; 302 all_cpu_cache_info[cpu].num_cache_leaves = 0; 303 memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject)); 304 return; 305 } 306 307 static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu) 308 { 309 unsigned long i, levels, unique_caches; 310 pal_cache_config_info_t cci; 311 int j; 312 long status; 313 struct cache_info *this_cache; 314 int num_cache_leaves = 0; 315 316 if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) { 317 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status); 318 return -1; 319 } 320 321 this_cache=kzalloc(sizeof(struct cache_info)*unique_caches, 322 GFP_KERNEL); 323 if (this_cache == NULL) 324 return -ENOMEM; 325 326 for (i=0; i < levels; i++) { 327 for (j=2; j >0 ; j--) { 328 if ((status=ia64_pal_cache_config_info(i,j, &cci)) != 329 PAL_STATUS_SUCCESS) 330 continue; 331 332 this_cache[num_cache_leaves].cci = cci; 333 this_cache[num_cache_leaves].level = i + 1; 334 this_cache[num_cache_leaves].type = j; 335 336 cache_shared_cpu_map_setup(cpu, 337 &this_cache[num_cache_leaves]); 338 num_cache_leaves ++; 339 } 340 } 341 342 all_cpu_cache_info[cpu].cache_leaves = this_cache; 343 all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves; 344 345 memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject)); 346 347 return 0; 348 } 349 350 /* Add cache interface for CPU device */ 351 static int __cpuinit cache_add_dev(struct sys_device * sys_dev) 352 { 353 unsigned int cpu = sys_dev->id; 354 unsigned long i, j; 355 struct cache_info *this_object; 356 int retval = 0; 357 cpumask_t oldmask; 358 359 if (all_cpu_cache_info[cpu].kobj.parent) 360 return 0; 361 362 oldmask = current->cpus_allowed; 363 retval = set_cpus_allowed(current, cpumask_of_cpu(cpu)); 364 if (unlikely(retval)) 365 return retval; 366 367 retval = cpu_cache_sysfs_init(cpu); 368 set_cpus_allowed(current, oldmask); 369 if (unlikely(retval < 0)) 370 return retval; 371 372 retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj, 373 &cache_ktype_percpu_entry, &sys_dev->kobj, 374 "%s", "cache"); 375 if (unlikely(retval < 0)) { 376 cpu_cache_sysfs_exit(cpu); 377 return retval; 378 } 379 380 for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) { 381 this_object = LEAF_KOBJECT_PTR(cpu,i); 382 retval = kobject_init_and_add(&(this_object->kobj), 383 &cache_ktype, 384 &all_cpu_cache_info[cpu].kobj, 385 "index%1lu", i); 386 if (unlikely(retval)) { 387 for (j = 0; j < i; j++) { 388 kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj)); 389 } 390 kobject_put(&all_cpu_cache_info[cpu].kobj); 391 cpu_cache_sysfs_exit(cpu); 392 return retval; 393 } 394 kobject_uevent(&(this_object->kobj), KOBJ_ADD); 395 } 396 kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD); 397 return retval; 398 } 399 400 /* Remove cache interface for CPU device */ 401 static int __cpuinit cache_remove_dev(struct sys_device * sys_dev) 402 { 403 unsigned int cpu = sys_dev->id; 404 unsigned long i; 405 406 for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) 407 kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj)); 408 409 if (all_cpu_cache_info[cpu].kobj.parent) { 410 kobject_put(&all_cpu_cache_info[cpu].kobj); 411 memset(&all_cpu_cache_info[cpu].kobj, 412 0, 413 sizeof(struct kobject)); 414 } 415 416 cpu_cache_sysfs_exit(cpu); 417 418 return 0; 419 } 420 421 /* 422 * When a cpu is hot-plugged, do a check and initiate 423 * cache kobject if necessary 424 */ 425 static int __cpuinit cache_cpu_callback(struct notifier_block *nfb, 426 unsigned long action, void *hcpu) 427 { 428 unsigned int cpu = (unsigned long)hcpu; 429 struct sys_device *sys_dev; 430 431 sys_dev = get_cpu_sysdev(cpu); 432 switch (action) { 433 case CPU_ONLINE: 434 case CPU_ONLINE_FROZEN: 435 cache_add_dev(sys_dev); 436 break; 437 case CPU_DEAD: 438 case CPU_DEAD_FROZEN: 439 cache_remove_dev(sys_dev); 440 break; 441 } 442 return NOTIFY_OK; 443 } 444 445 static struct notifier_block __cpuinitdata cache_cpu_notifier = 446 { 447 .notifier_call = cache_cpu_callback 448 }; 449 450 static int __init cache_sysfs_init(void) 451 { 452 int i; 453 454 for_each_online_cpu(i) { 455 struct sys_device *sys_dev = get_cpu_sysdev((unsigned int)i); 456 cache_add_dev(sys_dev); 457 } 458 459 register_hotcpu_notifier(&cache_cpu_notifier); 460 461 return 0; 462 } 463 464 device_initcall(cache_sysfs_init); 465 466