kernel/arch/ia64/kernel/topology.c

   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/slab.h>
  21 #include <linux/init.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/nodemask.h>
  24 #include <linux/notifier.h>
  25 #include <linux/export.h>
  26 #include <asm/mmzone.h>
  27 #include <asm/numa.h>
  28 #include <asm/cpu.h>
  29
  30 static struct ia64_cpu *sysfs_cpus;
  31
  32 void arch_fix_phys_package_id(int num, u32 slot)
  33 {
  34 #ifdef CONFIG_SMP
  35         if (cpu_data(num)->socket_id == -1)
  36                 cpu_data(num)->socket_id = slot;
  37 #endif
  38 }
  39 EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
  40
  41
  42 #ifdef CONFIG_HOTPLUG_CPU
  43 int __ref arch_register_cpu(int num)
  44 {
  45 #ifdef CONFIG_ACPI
  46         /*
  47          * If CPEI can be re-targeted or if this is not
  48          * CPEI target, then it is hotpluggable
  49          */
  50         if (can_cpei_retarget() || !is_cpu_cpei_target(num))
  51                 sysfs_cpus[num].cpu.hotpluggable = 1;
  52         map_cpu_to_node(num, node_cpuid[num].nid);
  53 #endif
  54         return register_cpu(&sysfs_cpus[num].cpu, num);
  55 }
  56 EXPORT_SYMBOL(arch_register_cpu);
  57
  58 void __ref arch_unregister_cpu(int num)
  59 {
  60         unregister_cpu(&sysfs_cpus[num].cpu);
  61 #ifdef CONFIG_ACPI
  62         unmap_cpu_from_node(num, cpu_to_node(num));
  63 #endif
  64 }
  65 EXPORT_SYMBOL(arch_unregister_cpu);
  66 #else
  67 static int __init arch_register_cpu(int num)
  68 {
  69         return register_cpu(&sysfs_cpus[num].cpu, num);
  70 }
  71 #endif /*CONFIG_HOTPLUG_CPU*/
  72
  73
  74 static int __init topology_init(void)
  75 {
  76         int i, err = 0;
  77
  78 #ifdef CONFIG_NUMA
  79         /*
  80          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  81          */
  82         for_each_online_node(i) {
  83                 if ((err = register_one_node(i)))
  84                         goto out;
  85         }
  86 #endif
  87
  88         sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
  89         if (!sysfs_cpus)
  90                 panic("kzalloc in topology_init failed - NR_CPUS too big?");
  91
  92         for_each_present_cpu(i) {
  93                 if((err = arch_register_cpu(i)))
  94                         goto out;
  95         }
  96 out:
  97         return err;
  98 }
  99
 100 subsys_initcall(topology_init);
 101
 102
 103 /*
 104  * Export cpu cache information through sysfs
 105  */
 106
 107 /*
 108  *  A bunch of string array to get pretty printing
 109  */
 110 static const char *cache_types[] = {
 111         "",                     /* not used */
 112         "Instruction",
 113         "Data",
 114         "Unified"       /* unified */
 115 };
 116
 117 static const char *cache_mattrib[]={
 118         "WriteThrough",
 119         "WriteBack",
 120         "",             /* reserved */
 121         ""              /* reserved */
 122 };
 123
 124 struct cache_info {
 125         pal_cache_config_info_t cci;
 126         cpumask_t shared_cpu_map;
 127         int level;
 128         int type;
 129         struct kobject kobj;
 130 };
 131
 132 struct cpu_cache_info {
 133         struct cache_info *cache_leaves;
 134         int     num_cache_leaves;
 135         struct kobject kobj;
 136 };
 137
 138 static struct cpu_cache_info    all_cpu_cache_info[NR_CPUS];
 139 #define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
 140
 141 #ifdef CONFIG_SMP
 142 static void cache_shared_cpu_map_setup(unsigned int cpu,
 143                 struct cache_info * this_leaf)
 144 {
 145         pal_cache_shared_info_t csi;
 146         int num_shared, i = 0;
 147         unsigned int j;
 148
 149         if (cpu_data(cpu)->threads_per_core <= 1 &&
 150                 cpu_data(cpu)->cores_per_socket <= 1) {
 151                 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
 152                 return;
 153         }
 154
 155         if (ia64_pal_cache_shared_info(this_leaf->level,
 156                                         this_leaf->type,
 157                                         0,
 158                                         &csi) != PAL_STATUS_SUCCESS)
 159                 return;
 160
 161         num_shared = (int) csi.num_shared;
 162         do {
 163                 for_each_possible_cpu(j)
 164                         if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
 165                                 && cpu_data(j)->core_id == csi.log1_cid
 166                                 && cpu_data(j)->thread_id == csi.log1_tid)
 167                                 cpumask_set_cpu(j, &this_leaf->shared_cpu_map);
 168
 169                 i++;
 170         } while (i < num_shared &&
 171                 ia64_pal_cache_shared_info(this_leaf->level,
 172                                 this_leaf->type,
 173                                 i,
 174                                 &csi) == PAL_STATUS_SUCCESS);
 175 }
 176 #else
 177 static void cache_shared_cpu_map_setup(unsigned int cpu,
 178                 struct cache_info * this_leaf)
 179 {
 180         cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
 181         return;
 182 }
 183 #endif
 184
 185 static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
 186                                         char *buf)
 187 {
 188         return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
 189 }
 190
 191 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
 192                                         char *buf)
 193 {
 194         return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
 195 }
 196
 197 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
 198 {
 199         return sprintf(buf,
 200                         "%s\n",
 201                         cache_mattrib[this_leaf->cci.pcci_cache_attr]);
 202 }
 203
 204 static ssize_t show_size(struct cache_info *this_leaf, char *buf)
 205 {
 206         return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
 207 }
 208
 209 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
 210 {
 211         unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
 212         number_of_sets /= this_leaf->cci.pcci_assoc;
 213         number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
 214
 215         return sprintf(buf, "%u\n", number_of_sets);
 216 }
 217
 218 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
 219 {
 220         cpumask_t shared_cpu_map;
 221
 222         cpumask_and(&shared_cpu_map,
 223                                 &this_leaf->shared_cpu_map, cpu_online_mask);
 224         return scnprintf(buf, PAGE_SIZE, "%*pb\n",
 225                          cpumask_pr_args(&shared_cpu_map));
 226 }
 227
 228 static ssize_t show_type(struct cache_info *this_leaf, char *buf)
 229 {
 230         int type = this_leaf->type + this_leaf->cci.pcci_unified;
 231         return sprintf(buf, "%s\n", cache_types[type]);
 232 }
 233
 234 static ssize_t show_level(struct cache_info *this_leaf, char *buf)
 235 {
 236         return sprintf(buf, "%u\n", this_leaf->level);
 237 }
 238
 239 struct cache_attr {
 240         struct attribute attr;
 241         ssize_t (*show)(struct cache_info *, char *);
 242         ssize_t (*store)(struct cache_info *, const char *, size_t count);
 243 };
 244
 245 #ifdef define_one_ro
 246         #undef define_one_ro
 247 #endif
 248 #define define_one_ro(_name) \
 249         static struct cache_attr _name = \
 250 __ATTR(_name, 0444, show_##_name, NULL)
 251
 252 define_one_ro(level);
 253 define_one_ro(type);
 254 define_one_ro(coherency_line_size);
 255 define_one_ro(ways_of_associativity);
 256 define_one_ro(size);
 257 define_one_ro(number_of_sets);
 258 define_one_ro(shared_cpu_map);
 259 define_one_ro(attributes);
 260
 261 static struct attribute * cache_default_attrs[] = {
 262         &type.attr,
 263         &level.attr,
 264         &coherency_line_size.attr,
 265         &ways_of_associativity.attr,
 266         &attributes.attr,
 267         &size.attr,
 268         &number_of_sets.attr,
 269         &shared_cpu_map.attr,
 270         NULL
 271 };
 272
 273 #define to_object(k) container_of(k, struct cache_info, kobj)
 274 #define to_attr(a) container_of(a, struct cache_attr, attr)
 275
 276 static ssize_t ia64_cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
 277 {
 278         struct cache_attr *fattr = to_attr(attr);
 279         struct cache_info *this_leaf = to_object(kobj);
 280         ssize_t ret;
 281
 282         ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
 283         return ret;
 284 }
 285
 286 static const struct sysfs_ops cache_sysfs_ops = {
 287         .show   = ia64_cache_show
 288 };
 289
 290 static struct kobj_type cache_ktype = {
 291         .sysfs_ops      = &cache_sysfs_ops,
 292         .default_attrs  = cache_default_attrs,
 293 };
 294
 295 static struct kobj_type cache_ktype_percpu_entry = {
 296         .sysfs_ops      = &cache_sysfs_ops,
 297 };
 298
 299 static void cpu_cache_sysfs_exit(unsigned int cpu)
 300 {
 301         kfree(all_cpu_cache_info[cpu].cache_leaves);
 302         all_cpu_cache_info[cpu].cache_leaves = NULL;
 303         all_cpu_cache_info[cpu].num_cache_leaves = 0;
 304         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 305         return;
 306 }
 307
 308 static int cpu_cache_sysfs_init(unsigned int cpu)
 309 {
 310         unsigned long i, levels, unique_caches;
 311         pal_cache_config_info_t cci;
 312         int j;
 313         long status;
 314         struct cache_info *this_cache;
 315         int num_cache_leaves = 0;
 316
 317         if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
 318                 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
 319                 return -1;
 320         }
 321
 322         this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
 323                         GFP_KERNEL);
 324         if (this_cache == NULL)
 325                 return -ENOMEM;
 326
 327         for (i=0; i < levels; i++) {
 328                 for (j=2; j >0 ; j--) {
 329                         if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
 330                                         PAL_STATUS_SUCCESS)
 331                                 continue;
 332
 333                         this_cache[num_cache_leaves].cci = cci;
 334                         this_cache[num_cache_leaves].level = i + 1;
 335                         this_cache[num_cache_leaves].type = j;
 336
 337                         cache_shared_cpu_map_setup(cpu,
 338                                         &this_cache[num_cache_leaves]);
 339                         num_cache_leaves ++;
 340                 }
 341         }
 342
 343         all_cpu_cache_info[cpu].cache_leaves = this_cache;
 344         all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
 345
 346         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 347
 348         return 0;
 349 }
 350
 351 /* Add cache interface for CPU device */
 352 static int cache_add_dev(struct device *sys_dev)
 353 {
 354         unsigned int cpu = sys_dev->id;
 355         unsigned long i, j;
 356         struct cache_info *this_object;
 357         int retval = 0;
 358         cpumask_t oldmask;
 359
 360         if (all_cpu_cache_info[cpu].kobj.parent)
 361                 return 0;
 362
 363         oldmask = current->cpus_allowed;
 364         retval = set_cpus_allowed_ptr(current, cpumask_of(cpu));
 365         if (unlikely(retval))
 366                 return retval;
 367
 368         retval = cpu_cache_sysfs_init(cpu);
 369         set_cpus_allowed_ptr(current, &oldmask);
 370         if (unlikely(retval < 0))
 371                 return retval;
 372
 373         retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
 374                                       &cache_ktype_percpu_entry, &sys_dev->kobj,
 375                                       "%s", "cache");
 376         if (unlikely(retval < 0)) {
 377                 cpu_cache_sysfs_exit(cpu);
 378                 return retval;
 379         }
 380
 381         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
 382                 this_object = LEAF_KOBJECT_PTR(cpu,i);
 383                 retval = kobject_init_and_add(&(this_object->kobj),
 384                                               &cache_ktype,
 385                                               &all_cpu_cache_info[cpu].kobj,
 386                                               "index%1lu", i);
 387                 if (unlikely(retval)) {
 388                         for (j = 0; j < i; j++) {
 389                                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
 390                         }
 391                         kobject_put(&all_cpu_cache_info[cpu].kobj);
 392                         cpu_cache_sysfs_exit(cpu);
 393                         return retval;
 394                 }
 395                 kobject_uevent(&(this_object->kobj), KOBJ_ADD);
 396         }
 397         kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD);
 398         return retval;
 399 }
 400
 401 /* Remove cache interface for CPU device */
 402 static int cache_remove_dev(struct device *sys_dev)
 403 {
 404         unsigned int cpu = sys_dev->id;
 405         unsigned long i;
 406
 407         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
 408                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
 409
 410         if (all_cpu_cache_info[cpu].kobj.parent) {
 411                 kobject_put(&all_cpu_cache_info[cpu].kobj);
 412                 memset(&all_cpu_cache_info[cpu].kobj,
 413                         0,
 414                         sizeof(struct kobject));
 415         }
 416
 417         cpu_cache_sysfs_exit(cpu);
 418
 419         return 0;
 420 }
 421
 422 /*
 423  * When a cpu is hot-plugged, do a check and initiate
 424  * cache kobject if necessary
 425  */
 426 static int cache_cpu_callback(struct notifier_block *nfb,
 427                 unsigned long action, void *hcpu)
 428 {
 429         unsigned int cpu = (unsigned long)hcpu;
 430         struct device *sys_dev;
 431
 432         sys_dev = get_cpu_device(cpu);
 433         switch (action) {
 434         case CPU_ONLINE:
 435         case CPU_ONLINE_FROZEN:
 436                 cache_add_dev(sys_dev);
 437                 break;
 438         case CPU_DEAD:
 439         case CPU_DEAD_FROZEN:
 440                 cache_remove_dev(sys_dev);
 441                 break;
 442         }
 443         return NOTIFY_OK;
 444 }
 445
 446 static struct notifier_block cache_cpu_notifier =
 447 {
 448         .notifier_call = cache_cpu_callback
 449 };
 450
 451 static int __init cache_sysfs_init(void)
 452 {
 453         int i;
 454
 455         cpu_notifier_register_begin();
 456
 457         for_each_online_cpu(i) {
 458                 struct device *sys_dev = get_cpu_device((unsigned int)i);
 459                 cache_add_dev(sys_dev);
 460         }
 461
 462         __register_hotcpu_notifier(&cache_cpu_notifier);
 463
 464         cpu_notifier_register_done();
 465
 466         return 0;
 467 }
 468
 469 device_initcall(cache_sysfs_init);
 470