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/config.h>
  17 #include <linux/cpu.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/node.h>
  21 #include <linux/init.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/nodemask.h>
  24 #include <linux/notifier.h>
  25 #include <asm/mmzone.h>
  26 #include <asm/numa.h>
  27 #include <asm/cpu.h>
  28
  29 #ifdef CONFIG_NUMA
  30 static struct node *sysfs_nodes;
  31 #endif
  32 static struct ia64_cpu *sysfs_cpus;
  33
  34 int arch_register_cpu(int num)
  35 {
  36         struct node *parent = NULL;
  37
  38 #ifdef CONFIG_NUMA
  39         parent = &sysfs_nodes[cpu_to_node(num)];
  40 #endif /* CONFIG_NUMA */
  41
  42 #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
  43         /*
  44          * If CPEI cannot be re-targetted, and this is
  45          * CPEI target, then dont create the control file
  46          */
  47         if (!can_cpei_retarget() && is_cpu_cpei_target(num))
  48                 sysfs_cpus[num].cpu.no_control = 1;
  49 #endif
  50
  51         return register_cpu(&sysfs_cpus[num].cpu, num, parent);
  52 }
  53
  54 #ifdef CONFIG_HOTPLUG_CPU
  55
  56 void arch_unregister_cpu(int num)
  57 {
  58         struct node *parent = NULL;
  59
  60 #ifdef CONFIG_NUMA
  61         int node = cpu_to_node(num);
  62         parent = &sysfs_nodes[node];
  63 #endif /* CONFIG_NUMA */
  64
  65         return unregister_cpu(&sysfs_cpus[num].cpu, parent);
  66 }
  67 EXPORT_SYMBOL(arch_register_cpu);
  68 EXPORT_SYMBOL(arch_unregister_cpu);
  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         sysfs_nodes = kzalloc(sizeof(struct node) * MAX_NUMNODES, GFP_KERNEL);
  78         if (!sysfs_nodes) {
  79                 err = -ENOMEM;
  80                 goto out;
  81         }
  82
  83         /*
  84          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  85          */
  86         for_each_online_node(i) {
  87                 if ((err = register_node(&sysfs_nodes[i], i, 0)))
  88                         goto out;
  89         }
  90 #endif
  91
  92         sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
  93         if (!sysfs_cpus) {
  94                 err = -ENOMEM;
  95                 goto out;
  96         }
  97
  98         for_each_present_cpu(i) {
  99                 if((err = arch_register_cpu(i)))
 100                         goto out;
 101         }
 102 out:
 103         return err;
 104 }
 105
 106 subsys_initcall(topology_init);
 107
 108
 109 /*
 110  * Export cpu cache information through sysfs
 111  */
 112
 113 /*
 114  *  A bunch of string array to get pretty printing
 115  */
 116 static const char *cache_types[] = {
 117         "",                     /* not used */
 118         "Instruction",
 119         "Data",
 120         "Unified"       /* unified */
 121 };
 122
 123 static const char *cache_mattrib[]={
 124         "WriteThrough",
 125         "WriteBack",
 126         "",             /* reserved */
 127         ""              /* reserved */
 128 };
 129
 130 struct cache_info {
 131         pal_cache_config_info_t cci;
 132         cpumask_t shared_cpu_map;
 133         int level;
 134         int type;
 135         struct kobject kobj;
 136 };
 137
 138 struct cpu_cache_info {
 139         struct cache_info *cache_leaves;
 140         int     num_cache_leaves;
 141         struct kobject kobj;
 142 };
 143
 144 static struct cpu_cache_info    all_cpu_cache_info[NR_CPUS];
 145 #define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
 146
 147 #ifdef CONFIG_SMP
 148 static void cache_shared_cpu_map_setup( unsigned int cpu,
 149                 struct cache_info * this_leaf)
 150 {
 151         pal_cache_shared_info_t csi;
 152         int num_shared, i = 0;
 153         unsigned int j;
 154
 155         if (cpu_data(cpu)->threads_per_core <= 1 &&
 156                 cpu_data(cpu)->cores_per_socket <= 1) {
 157                 cpu_set(cpu, this_leaf->shared_cpu_map);
 158                 return;
 159         }
 160
 161         if (ia64_pal_cache_shared_info(this_leaf->level,
 162                                         this_leaf->type,
 163                                         0,
 164                                         &csi) != PAL_STATUS_SUCCESS)
 165                 return;
 166
 167         num_shared = (int) csi.num_shared;
 168         do {
 169                 for_each_cpu(j)
 170                         if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
 171                                 && cpu_data(j)->core_id == csi.log1_cid
 172                                 && cpu_data(j)->thread_id == csi.log1_tid)
 173                                 cpu_set(j, this_leaf->shared_cpu_map);
 174
 175                 i++;
 176         } while (i < num_shared &&
 177                 ia64_pal_cache_shared_info(this_leaf->level,
 178                                 this_leaf->type,
 179                                 i,
 180                                 &csi) == PAL_STATUS_SUCCESS);
 181 }
 182 #else
 183 static void cache_shared_cpu_map_setup(unsigned int cpu,
 184                 struct cache_info * this_leaf)
 185 {
 186         cpu_set(cpu, this_leaf->shared_cpu_map);
 187         return;
 188 }
 189 #endif
 190
 191 static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
 192                                         char *buf)
 193 {
 194         return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
 195 }
 196
 197 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
 198                                         char *buf)
 199 {
 200         return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
 201 }
 202
 203 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
 204 {
 205         return sprintf(buf,
 206                         "%s\n",
 207                         cache_mattrib[this_leaf->cci.pcci_cache_attr]);
 208 }
 209
 210 static ssize_t show_size(struct cache_info *this_leaf, char *buf)
 211 {
 212         return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
 213 }
 214
 215 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
 216 {
 217         unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
 218         number_of_sets /= this_leaf->cci.pcci_assoc;
 219         number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
 220
 221         return sprintf(buf, "%u\n", number_of_sets);
 222 }
 223
 224 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
 225 {
 226         ssize_t len;
 227         cpumask_t shared_cpu_map;
 228
 229         cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
 230         len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
 231         len += sprintf(buf+len, "\n");
 232         return len;
 233 }
 234
 235 static ssize_t show_type(struct cache_info *this_leaf, char *buf)
 236 {
 237         int type = this_leaf->type + this_leaf->cci.pcci_unified;
 238         return sprintf(buf, "%s\n", cache_types[type]);
 239 }
 240
 241 static ssize_t show_level(struct cache_info *this_leaf, char *buf)
 242 {
 243         return sprintf(buf, "%u\n", this_leaf->level);
 244 }
 245
 246 struct cache_attr {
 247         struct attribute attr;
 248         ssize_t (*show)(struct cache_info *, char *);
 249         ssize_t (*store)(struct cache_info *, const char *, size_t count);
 250 };
 251
 252 #ifdef define_one_ro
 253         #undef define_one_ro
 254 #endif
 255 #define define_one_ro(_name) \
 256         static struct cache_attr _name = \
 257 __ATTR(_name, 0444, show_##_name, NULL)
 258
 259 define_one_ro(level);
 260 define_one_ro(type);
 261 define_one_ro(coherency_line_size);
 262 define_one_ro(ways_of_associativity);
 263 define_one_ro(size);
 264 define_one_ro(number_of_sets);
 265 define_one_ro(shared_cpu_map);
 266 define_one_ro(attributes);
 267
 268 static struct attribute * cache_default_attrs[] = {
 269         &type.attr,
 270         &level.attr,
 271         &coherency_line_size.attr,
 272         &ways_of_associativity.attr,
 273         &attributes.attr,
 274         &size.attr,
 275         &number_of_sets.attr,
 276         &shared_cpu_map.attr,
 277         NULL
 278 };
 279
 280 #define to_object(k) container_of(k, struct cache_info, kobj)
 281 #define to_attr(a) container_of(a, struct cache_attr, attr)
 282
 283 static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
 284 {
 285         struct cache_attr *fattr = to_attr(attr);
 286         struct cache_info *this_leaf = to_object(kobj);
 287         ssize_t ret;
 288
 289         ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
 290         return ret;
 291 }
 292
 293 static struct sysfs_ops cache_sysfs_ops = {
 294         .show   = cache_show
 295 };
 296
 297 static struct kobj_type cache_ktype = {
 298         .sysfs_ops      = &cache_sysfs_ops,
 299         .default_attrs  = cache_default_attrs,
 300 };
 301
 302 static struct kobj_type cache_ktype_percpu_entry = {
 303         .sysfs_ops      = &cache_sysfs_ops,
 304 };
 305
 306 static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
 307 {
 308         kfree(all_cpu_cache_info[cpu].cache_leaves);
 309         all_cpu_cache_info[cpu].cache_leaves = NULL;
 310         all_cpu_cache_info[cpu].num_cache_leaves = 0;
 311         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 312         return;
 313 }
 314
 315 static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
 316 {
 317         u64 i, levels, unique_caches;
 318         pal_cache_config_info_t cci;
 319         int j;
 320         s64 status;
 321         struct cache_info *this_cache;
 322         int num_cache_leaves = 0;
 323
 324         if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
 325                 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
 326                 return -1;
 327         }
 328
 329         this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
 330                         GFP_KERNEL);
 331         if (this_cache == NULL)
 332                 return -ENOMEM;
 333
 334         for (i=0; i < levels; i++) {
 335                 for (j=2; j >0 ; j--) {
 336                         if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
 337                                         PAL_STATUS_SUCCESS)
 338                                 continue;
 339
 340                         this_cache[num_cache_leaves].cci = cci;
 341                         this_cache[num_cache_leaves].level = i + 1;
 342                         this_cache[num_cache_leaves].type = j;
 343
 344                         cache_shared_cpu_map_setup(cpu,
 345                                         &this_cache[num_cache_leaves]);
 346                         num_cache_leaves ++;
 347                 }
 348         }
 349
 350         all_cpu_cache_info[cpu].cache_leaves = this_cache;
 351         all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
 352
 353         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 354
 355         return 0;
 356 }
 357
 358 /* Add cache interface for CPU device */
 359 static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 360 {
 361         unsigned int cpu = sys_dev->id;
 362         unsigned long i, j;
 363         struct cache_info *this_object;
 364         int retval = 0;
 365         cpumask_t oldmask;
 366
 367         if (all_cpu_cache_info[cpu].kobj.parent)
 368                 return 0;
 369
 370         oldmask = current->cpus_allowed;
 371         retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
 372         if (unlikely(retval))
 373                 return retval;
 374
 375         retval = cpu_cache_sysfs_init(cpu);
 376         set_cpus_allowed(current, oldmask);
 377         if (unlikely(retval < 0))
 378                 return retval;
 379
 380         all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj;
 381         kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache");
 382         all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry;
 383         retval = kobject_register(&all_cpu_cache_info[cpu].kobj);
 384
 385         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
 386                 this_object = LEAF_KOBJECT_PTR(cpu,i);
 387                 this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj;
 388                 kobject_set_name(&(this_object->kobj), "index%1lu", i);
 389                 this_object->kobj.ktype = &cache_ktype;
 390                 retval = kobject_register(&(this_object->kobj));
 391                 if (unlikely(retval)) {
 392                         for (j = 0; j < i; j++) {
 393                                 kobject_unregister(
 394                                         &(LEAF_KOBJECT_PTR(cpu,j)->kobj));
 395                         }
 396                         kobject_unregister(&all_cpu_cache_info[cpu].kobj);
 397                         cpu_cache_sysfs_exit(cpu);
 398                         break;
 399                 }
 400         }
 401         return retval;
 402 }
 403
 404 /* Remove cache interface for CPU device */
 405 static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
 406 {
 407         unsigned int cpu = sys_dev->id;
 408         unsigned long i;
 409
 410         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
 411                 kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
 412
 413         if (all_cpu_cache_info[cpu].kobj.parent) {
 414                 kobject_unregister(&all_cpu_cache_info[cpu].kobj);
 415                 memset(&all_cpu_cache_info[cpu].kobj,
 416                         0,
 417                         sizeof(struct kobject));
 418         }
 419
 420         cpu_cache_sysfs_exit(cpu);
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * When a cpu is hot-plugged, do a check and initiate
 427  * cache kobject if necessary
 428  */
 429 static int cache_cpu_callback(struct notifier_block *nfb,
 430                 unsigned long action, void *hcpu)
 431 {
 432         unsigned int cpu = (unsigned long)hcpu;
 433         struct sys_device *sys_dev;
 434
 435         sys_dev = get_cpu_sysdev(cpu);
 436         switch (action) {
 437         case CPU_ONLINE:
 438                 cache_add_dev(sys_dev);
 439                 break;
 440         case CPU_DEAD:
 441                 cache_remove_dev(sys_dev);
 442                 break;
 443         }
 444         return NOTIFY_OK;
 445 }
 446
 447 static struct notifier_block cache_cpu_notifier =
 448 {
 449         .notifier_call = cache_cpu_callback
 450 };
 451
 452 static int __cpuinit cache_sysfs_init(void)
 453 {
 454         int i;
 455
 456         for_each_online_cpu(i) {
 457                 cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE,
 458                                 (void *)(long)i);
 459         }
 460
 461         register_cpu_notifier(&cache_cpu_notifier);
 462
 463         return 0;
 464 }
 465
 466 device_initcall(cache_sysfs_init);
 467