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 static struct ia64_cpu *sysfs_cpus;
  30
  31 int arch_register_cpu(int num)
  32 {
  33         struct node *parent = NULL;
  34
  35 #ifdef CONFIG_NUMA
  36         parent = &node_devices[cpu_to_node(num)];
  37 #endif /* CONFIG_NUMA */
  38
  39 #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
  40         /*
  41          * If CPEI cannot be re-targetted, and this is
  42          * CPEI target, then dont create the control file
  43          */
  44         if (!can_cpei_retarget() && is_cpu_cpei_target(num))
  45                 sysfs_cpus[num].cpu.no_control = 1;
  46 #endif
  47
  48         return register_cpu(&sysfs_cpus[num].cpu, num, parent);
  49 }
  50
  51 #ifdef CONFIG_HOTPLUG_CPU
  52
  53 void arch_unregister_cpu(int num)
  54 {
  55         struct node *parent = NULL;
  56
  57 #ifdef CONFIG_NUMA
  58         int node = cpu_to_node(num);
  59         parent = &node_devices[node];
  60 #endif /* CONFIG_NUMA */
  61
  62         return unregister_cpu(&sysfs_cpus[num].cpu, parent);
  63 }
  64 EXPORT_SYMBOL(arch_register_cpu);
  65 EXPORT_SYMBOL(arch_unregister_cpu);
  66 #endif /*CONFIG_HOTPLUG_CPU*/
  67
  68
  69 static int __init topology_init(void)
  70 {
  71         int i, err = 0;
  72
  73 #ifdef CONFIG_NUMA
  74         /*
  75          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  76          */
  77         for_each_online_node(i) {
  78                 if ((err = register_one_node(i)))
  79                         goto out;
  80         }
  81 #endif
  82
  83         sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
  84         if (!sysfs_cpus) {
  85                 err = -ENOMEM;
  86                 goto out;
  87         }
  88
  89         for_each_present_cpu(i) {
  90                 if((err = arch_register_cpu(i)))
  91                         goto out;
  92         }
  93 out:
  94         return err;
  95 }
  96
  97 subsys_initcall(topology_init);
  98
  99
 100 /*
 101  * Export cpu cache information through sysfs
 102  */
 103
 104 /*
 105  *  A bunch of string array to get pretty printing
 106  */
 107 static const char *cache_types[] = {
 108         "",                     /* not used */
 109         "Instruction",
 110         "Data",
 111         "Unified"       /* unified */
 112 };
 113
 114 static const char *cache_mattrib[]={
 115         "WriteThrough",
 116         "WriteBack",
 117         "",             /* reserved */
 118         ""              /* reserved */
 119 };
 120
 121 struct cache_info {
 122         pal_cache_config_info_t cci;
 123         cpumask_t shared_cpu_map;
 124         int level;
 125         int type;
 126         struct kobject kobj;
 127 };
 128
 129 struct cpu_cache_info {
 130         struct cache_info *cache_leaves;
 131         int     num_cache_leaves;
 132         struct kobject kobj;
 133 };
 134
 135 static struct cpu_cache_info    all_cpu_cache_info[NR_CPUS];
 136 #define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
 137
 138 #ifdef CONFIG_SMP
 139 static void cache_shared_cpu_map_setup( unsigned int cpu,
 140                 struct cache_info * this_leaf)
 141 {
 142         pal_cache_shared_info_t csi;
 143         int num_shared, i = 0;
 144         unsigned int j;
 145
 146         if (cpu_data(cpu)->threads_per_core <= 1 &&
 147                 cpu_data(cpu)->cores_per_socket <= 1) {
 148                 cpu_set(cpu, this_leaf->shared_cpu_map);
 149                 return;
 150         }
 151
 152         if (ia64_pal_cache_shared_info(this_leaf->level,
 153                                         this_leaf->type,
 154                                         0,
 155                                         &csi) != PAL_STATUS_SUCCESS)
 156                 return;
 157
 158         num_shared = (int) csi.num_shared;
 159         do {
 160                 for_each_possible_cpu(j)
 161                         if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
 162                                 && cpu_data(j)->core_id == csi.log1_cid
 163                                 && cpu_data(j)->thread_id == csi.log1_tid)
 164                                 cpu_set(j, this_leaf->shared_cpu_map);
 165
 166                 i++;
 167         } while (i < num_shared &&
 168                 ia64_pal_cache_shared_info(this_leaf->level,
 169                                 this_leaf->type,
 170                                 i,
 171                                 &csi) == PAL_STATUS_SUCCESS);
 172 }
 173 #else
 174 static void cache_shared_cpu_map_setup(unsigned int cpu,
 175                 struct cache_info * this_leaf)
 176 {
 177         cpu_set(cpu, this_leaf->shared_cpu_map);
 178         return;
 179 }
 180 #endif
 181
 182 static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
 183                                         char *buf)
 184 {
 185         return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
 186 }
 187
 188 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
 189                                         char *buf)
 190 {
 191         return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
 192 }
 193
 194 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
 195 {
 196         return sprintf(buf,
 197                         "%s\n",
 198                         cache_mattrib[this_leaf->cci.pcci_cache_attr]);
 199 }
 200
 201 static ssize_t show_size(struct cache_info *this_leaf, char *buf)
 202 {
 203         return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
 204 }
 205
 206 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
 207 {
 208         unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
 209         number_of_sets /= this_leaf->cci.pcci_assoc;
 210         number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
 211
 212         return sprintf(buf, "%u\n", number_of_sets);
 213 }
 214
 215 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
 216 {
 217         ssize_t len;
 218         cpumask_t shared_cpu_map;
 219
 220         cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
 221         len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
 222         len += sprintf(buf+len, "\n");
 223         return len;
 224 }
 225
 226 static ssize_t show_type(struct cache_info *this_leaf, char *buf)
 227 {
 228         int type = this_leaf->type + this_leaf->cci.pcci_unified;
 229         return sprintf(buf, "%s\n", cache_types[type]);
 230 }
 231
 232 static ssize_t show_level(struct cache_info *this_leaf, char *buf)
 233 {
 234         return sprintf(buf, "%u\n", this_leaf->level);
 235 }
 236
 237 struct cache_attr {
 238         struct attribute attr;
 239         ssize_t (*show)(struct cache_info *, char *);
 240         ssize_t (*store)(struct cache_info *, const char *, size_t count);
 241 };
 242
 243 #ifdef define_one_ro
 244         #undef define_one_ro
 245 #endif
 246 #define define_one_ro(_name) \
 247         static struct cache_attr _name = \
 248 __ATTR(_name, 0444, show_##_name, NULL)
 249
 250 define_one_ro(level);
 251 define_one_ro(type);
 252 define_one_ro(coherency_line_size);
 253 define_one_ro(ways_of_associativity);
 254 define_one_ro(size);
 255 define_one_ro(number_of_sets);
 256 define_one_ro(shared_cpu_map);
 257 define_one_ro(attributes);
 258
 259 static struct attribute * cache_default_attrs[] = {
 260         &type.attr,
 261         &level.attr,
 262         &coherency_line_size.attr,
 263         &ways_of_associativity.attr,
 264         &attributes.attr,
 265         &size.attr,
 266         &number_of_sets.attr,
 267         &shared_cpu_map.attr,
 268         NULL
 269 };
 270
 271 #define to_object(k) container_of(k, struct cache_info, kobj)
 272 #define to_attr(a) container_of(a, struct cache_attr, attr)
 273
 274 static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
 275 {
 276         struct cache_attr *fattr = to_attr(attr);
 277         struct cache_info *this_leaf = to_object(kobj);
 278         ssize_t ret;
 279
 280         ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
 281         return ret;
 282 }
 283
 284 static struct sysfs_ops cache_sysfs_ops = {
 285         .show   = cache_show
 286 };
 287
 288 static struct kobj_type cache_ktype = {
 289         .sysfs_ops      = &cache_sysfs_ops,
 290         .default_attrs  = cache_default_attrs,
 291 };
 292
 293 static struct kobj_type cache_ktype_percpu_entry = {
 294         .sysfs_ops      = &cache_sysfs_ops,
 295 };
 296
 297 static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
 298 {
 299         kfree(all_cpu_cache_info[cpu].cache_leaves);
 300         all_cpu_cache_info[cpu].cache_leaves = NULL;
 301         all_cpu_cache_info[cpu].num_cache_leaves = 0;
 302         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 303         return;
 304 }
 305
 306 static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
 307 {
 308         u64 i, levels, unique_caches;
 309         pal_cache_config_info_t cci;
 310         int j;
 311         s64 status;
 312         struct cache_info *this_cache;
 313         int num_cache_leaves = 0;
 314
 315         if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
 316                 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
 317                 return -1;
 318         }
 319
 320         this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
 321                         GFP_KERNEL);
 322         if (this_cache == NULL)
 323                 return -ENOMEM;
 324
 325         for (i=0; i < levels; i++) {
 326                 for (j=2; j >0 ; j--) {
 327                         if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
 328                                         PAL_STATUS_SUCCESS)
 329                                 continue;
 330
 331                         this_cache[num_cache_leaves].cci = cci;
 332                         this_cache[num_cache_leaves].level = i + 1;
 333                         this_cache[num_cache_leaves].type = j;
 334
 335                         cache_shared_cpu_map_setup(cpu,
 336                                         &this_cache[num_cache_leaves]);
 337                         num_cache_leaves ++;
 338                 }
 339         }
 340
 341         all_cpu_cache_info[cpu].cache_leaves = this_cache;
 342         all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
 343
 344         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 345
 346         return 0;
 347 }
 348
 349 /* Add cache interface for CPU device */
 350 static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 351 {
 352         unsigned int cpu = sys_dev->id;
 353         unsigned long i, j;
 354         struct cache_info *this_object;
 355         int retval = 0;
 356         cpumask_t oldmask;
 357
 358         if (all_cpu_cache_info[cpu].kobj.parent)
 359                 return 0;
 360
 361         oldmask = current->cpus_allowed;
 362         retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
 363         if (unlikely(retval))
 364                 return retval;
 365
 366         retval = cpu_cache_sysfs_init(cpu);
 367         set_cpus_allowed(current, oldmask);
 368         if (unlikely(retval < 0))
 369                 return retval;
 370
 371         all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj;
 372         kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache");
 373         all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry;
 374         retval = kobject_register(&all_cpu_cache_info[cpu].kobj);
 375
 376         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
 377                 this_object = LEAF_KOBJECT_PTR(cpu,i);
 378                 this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj;
 379                 kobject_set_name(&(this_object->kobj), "index%1lu", i);
 380                 this_object->kobj.ktype = &cache_ktype;
 381                 retval = kobject_register(&(this_object->kobj));
 382                 if (unlikely(retval)) {
 383                         for (j = 0; j < i; j++) {
 384                                 kobject_unregister(
 385                                         &(LEAF_KOBJECT_PTR(cpu,j)->kobj));
 386                         }
 387                         kobject_unregister(&all_cpu_cache_info[cpu].kobj);
 388                         cpu_cache_sysfs_exit(cpu);
 389                         break;
 390                 }
 391         }
 392         return retval;
 393 }
 394
 395 /* Remove cache interface for CPU device */
 396 static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
 397 {
 398         unsigned int cpu = sys_dev->id;
 399         unsigned long i;
 400
 401         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
 402                 kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
 403
 404         if (all_cpu_cache_info[cpu].kobj.parent) {
 405                 kobject_unregister(&all_cpu_cache_info[cpu].kobj);
 406                 memset(&all_cpu_cache_info[cpu].kobj,
 407                         0,
 408                         sizeof(struct kobject));
 409         }
 410
 411         cpu_cache_sysfs_exit(cpu);
 412
 413         return 0;
 414 }
 415
 416 /*
 417  * When a cpu is hot-plugged, do a check and initiate
 418  * cache kobject if necessary
 419  */
 420 static int cache_cpu_callback(struct notifier_block *nfb,
 421                 unsigned long action, void *hcpu)
 422 {
 423         unsigned int cpu = (unsigned long)hcpu;
 424         struct sys_device *sys_dev;
 425
 426         sys_dev = get_cpu_sysdev(cpu);
 427         switch (action) {
 428         case CPU_ONLINE:
 429                 cache_add_dev(sys_dev);
 430                 break;
 431         case CPU_DEAD:
 432                 cache_remove_dev(sys_dev);
 433                 break;
 434         }
 435         return NOTIFY_OK;
 436 }
 437
 438 static struct notifier_block cache_cpu_notifier =
 439 {
 440         .notifier_call = cache_cpu_callback
 441 };
 442
 443 static int __cpuinit cache_sysfs_init(void)
 444 {
 445         int i;
 446
 447         for_each_online_cpu(i) {
 448                 cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE,
 449                                 (void *)(long)i);
 450         }
 451
 452         register_cpu_notifier(&cache_cpu_notifier);
 453
 454         return 0;
 455 }
 456
 457 device_initcall(cache_sysfs_init);
 458