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