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