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