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 void arch_fix_phys_package_id(int num, u32 slot)
  31 {
  32 #ifdef CONFIG_SMP
  33         if (cpu_data(num)->socket_id == -1)
  34                 cpu_data(num)->socket_id = slot;
  35 #endif
  36 }
  37 EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
  38
  39 int arch_register_cpu(int num)
  40 {
  41 #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
  42         /*
  43          * If CPEI can be re-targetted or if this is not
  44          * CPEI target, then it is hotpluggable
  45          */
  46         if (can_cpei_retarget() || !is_cpu_cpei_target(num))
  47                 sysfs_cpus[num].cpu.hotpluggable = 1;
  48         map_cpu_to_node(num, node_cpuid[num].nid);
  49 #endif
  50
  51         return register_cpu(&sysfs_cpus[num].cpu, num);
  52 }
  53
  54 #ifdef CONFIG_HOTPLUG_CPU
  55
  56 void arch_unregister_cpu(int num)
  57 {
  58         unregister_cpu(&sysfs_cpus[num].cpu);
  59         unmap_cpu_from_node(num, cpu_to_node(num));
  60 }
  61 EXPORT_SYMBOL(arch_register_cpu);
  62 EXPORT_SYMBOL(arch_unregister_cpu);
  63 #endif /*CONFIG_HOTPLUG_CPU*/
  64
  65
  66 static int __init topology_init(void)
  67 {
  68         int i, err = 0;
  69
  70 #ifdef CONFIG_NUMA
  71         /*
  72          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  73          */
  74         for_each_online_node(i) {
  75                 if ((err = register_one_node(i)))
  76                         goto out;
  77         }
  78 #endif
  79
  80         sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
  81         if (!sysfs_cpus)
  82                 panic("kzalloc in topology_init failed - NR_CPUS too big?");
  83
  84         for_each_present_cpu(i) {
  85                 if((err = arch_register_cpu(i)))
  86                         goto out;
  87         }
  88 out:
  89         return err;
  90 }
  91
  92 subsys_initcall(topology_init);
  93
  94
  95 /*
  96  * Export cpu cache information through sysfs
  97  */
  98
  99 /*
 100  *  A bunch of string array to get pretty printing
 101  */
 102 static const char *cache_types[] = {
 103         "",                     /* not used */
 104         "Instruction",
 105         "Data",
 106         "Unified"       /* unified */
 107 };
 108
 109 static const char *cache_mattrib[]={
 110         "WriteThrough",
 111         "WriteBack",
 112         "",             /* reserved */
 113         ""              /* reserved */
 114 };
 115
 116 struct cache_info {
 117         pal_cache_config_info_t cci;
 118         cpumask_t shared_cpu_map;
 119         int level;
 120         int type;
 121         struct kobject kobj;
 122 };
 123
 124 struct cpu_cache_info {
 125         struct cache_info *cache_leaves;
 126         int     num_cache_leaves;
 127         struct kobject kobj;
 128 };
 129
 130 static struct cpu_cache_info    all_cpu_cache_info[NR_CPUS] __cpuinitdata;
 131 #define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
 132
 133 #ifdef CONFIG_SMP
 134 static void __cpuinit cache_shared_cpu_map_setup( unsigned int cpu,
 135                 struct cache_info * this_leaf)
 136 {
 137         pal_cache_shared_info_t csi;
 138         int num_shared, i = 0;
 139         unsigned int j;
 140
 141         if (cpu_data(cpu)->threads_per_core <= 1 &&
 142                 cpu_data(cpu)->cores_per_socket <= 1) {
 143                 cpu_set(cpu, this_leaf->shared_cpu_map);
 144                 return;
 145         }
 146
 147         if (ia64_pal_cache_shared_info(this_leaf->level,
 148                                         this_leaf->type,
 149                                         0,
 150                                         &csi) != PAL_STATUS_SUCCESS)
 151                 return;
 152
 153         num_shared = (int) csi.num_shared;
 154         do {
 155                 for_each_possible_cpu(j)
 156                         if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
 157                                 && cpu_data(j)->core_id == csi.log1_cid
 158                                 && cpu_data(j)->thread_id == csi.log1_tid)
 159                                 cpu_set(j, this_leaf->shared_cpu_map);
 160
 161                 i++;
 162         } while (i < num_shared &&
 163                 ia64_pal_cache_shared_info(this_leaf->level,
 164                                 this_leaf->type,
 165                                 i,
 166                                 &csi) == PAL_STATUS_SUCCESS);
 167 }
 168 #else
 169 static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu,
 170                 struct cache_info * this_leaf)
 171 {
 172         cpu_set(cpu, this_leaf->shared_cpu_map);
 173         return;
 174 }
 175 #endif
 176
 177 static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
 178                                         char *buf)
 179 {
 180         return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
 181 }
 182
 183 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
 184                                         char *buf)
 185 {
 186         return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
 187 }
 188
 189 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
 190 {
 191         return sprintf(buf,
 192                         "%s\n",
 193                         cache_mattrib[this_leaf->cci.pcci_cache_attr]);
 194 }
 195
 196 static ssize_t show_size(struct cache_info *this_leaf, char *buf)
 197 {
 198         return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
 199 }
 200
 201 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
 202 {
 203         unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
 204         number_of_sets /= this_leaf->cci.pcci_assoc;
 205         number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
 206
 207         return sprintf(buf, "%u\n", number_of_sets);
 208 }
 209
 210 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
 211 {
 212         ssize_t len;
 213         cpumask_t shared_cpu_map;
 214
 215         cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
 216         len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
 217         len += sprintf(buf+len, "\n");
 218         return len;
 219 }
 220
 221 static ssize_t show_type(struct cache_info *this_leaf, char *buf)
 222 {
 223         int type = this_leaf->type + this_leaf->cci.pcci_unified;
 224         return sprintf(buf, "%s\n", cache_types[type]);
 225 }
 226
 227 static ssize_t show_level(struct cache_info *this_leaf, char *buf)
 228 {
 229         return sprintf(buf, "%u\n", this_leaf->level);
 230 }
 231
 232 struct cache_attr {
 233         struct attribute attr;
 234         ssize_t (*show)(struct cache_info *, char *);
 235         ssize_t (*store)(struct cache_info *, const char *, size_t count);
 236 };
 237
 238 #ifdef define_one_ro
 239         #undef define_one_ro
 240 #endif
 241 #define define_one_ro(_name) \
 242         static struct cache_attr _name = \
 243 __ATTR(_name, 0444, show_##_name, NULL)
 244
 245 define_one_ro(level);
 246 define_one_ro(type);
 247 define_one_ro(coherency_line_size);
 248 define_one_ro(ways_of_associativity);
 249 define_one_ro(size);
 250 define_one_ro(number_of_sets);
 251 define_one_ro(shared_cpu_map);
 252 define_one_ro(attributes);
 253
 254 static struct attribute * cache_default_attrs[] = {
 255         &type.attr,
 256         &level.attr,
 257         &coherency_line_size.attr,
 258         &ways_of_associativity.attr,
 259         &attributes.attr,
 260         &size.attr,
 261         &number_of_sets.attr,
 262         &shared_cpu_map.attr,
 263         NULL
 264 };
 265
 266 #define to_object(k) container_of(k, struct cache_info, kobj)
 267 #define to_attr(a) container_of(a, struct cache_attr, attr)
 268
 269 static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
 270 {
 271         struct cache_attr *fattr = to_attr(attr);
 272         struct cache_info *this_leaf = to_object(kobj);
 273         ssize_t ret;
 274
 275         ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
 276         return ret;
 277 }
 278
 279 static struct sysfs_ops cache_sysfs_ops = {
 280         .show   = cache_show
 281 };
 282
 283 static struct kobj_type cache_ktype = {
 284         .sysfs_ops      = &cache_sysfs_ops,
 285         .default_attrs  = cache_default_attrs,
 286 };
 287
 288 static struct kobj_type cache_ktype_percpu_entry = {
 289         .sysfs_ops      = &cache_sysfs_ops,
 290 };
 291
 292 static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
 293 {
 294         kfree(all_cpu_cache_info[cpu].cache_leaves);
 295         all_cpu_cache_info[cpu].cache_leaves = NULL;
 296         all_cpu_cache_info[cpu].num_cache_leaves = 0;
 297         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 298         return;
 299 }
 300
 301 static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
 302 {
 303         u64 i, levels, unique_caches;
 304         pal_cache_config_info_t cci;
 305         int j;
 306         s64 status;
 307         struct cache_info *this_cache;
 308         int num_cache_leaves = 0;
 309
 310         if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
 311                 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
 312                 return -1;
 313         }
 314
 315         this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
 316                         GFP_KERNEL);
 317         if (this_cache == NULL)
 318                 return -ENOMEM;
 319
 320         for (i=0; i < levels; i++) {
 321                 for (j=2; j >0 ; j--) {
 322                         if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
 323                                         PAL_STATUS_SUCCESS)
 324                                 continue;
 325
 326                         this_cache[num_cache_leaves].cci = cci;
 327                         this_cache[num_cache_leaves].level = i + 1;
 328                         this_cache[num_cache_leaves].type = j;
 329
 330                         cache_shared_cpu_map_setup(cpu,
 331                                         &this_cache[num_cache_leaves]);
 332                         num_cache_leaves ++;
 333                 }
 334         }
 335
 336         all_cpu_cache_info[cpu].cache_leaves = this_cache;
 337         all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
 338
 339         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 340
 341         return 0;
 342 }
 343
 344 /* Add cache interface for CPU device */
 345 static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 346 {
 347         unsigned int cpu = sys_dev->id;
 348         unsigned long i, j;
 349         struct cache_info *this_object;
 350         int retval = 0;
 351         cpumask_t oldmask;
 352
 353         if (all_cpu_cache_info[cpu].kobj.parent)
 354                 return 0;
 355
 356         oldmask = current->cpus_allowed;
 357         retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
 358         if (unlikely(retval))
 359                 return retval;
 360
 361         retval = cpu_cache_sysfs_init(cpu);
 362         set_cpus_allowed(current, oldmask);
 363         if (unlikely(retval < 0))
 364                 return retval;
 365
 366         retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
 367                                       &cache_ktype_percpu_entry, &sys_dev->kobj,
 368                                       "%s", "cache");
 369
 370         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
 371                 this_object = LEAF_KOBJECT_PTR(cpu,i);
 372                 retval = kobject_init_and_add(&(this_object->kobj),
 373                                               &cache_ktype,
 374                                               &all_cpu_cache_info[cpu].kobj,
 375                                               "index%1lu", i);
 376                 if (unlikely(retval)) {
 377                         for (j = 0; j < i; j++) {
 378                                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
 379                         }
 380                         kobject_put(&all_cpu_cache_info[cpu].kobj);
 381                         cpu_cache_sysfs_exit(cpu);
 382                         break;
 383                 }
 384                 kobject_uevent(&(this_object->kobj), KOBJ_ADD);
 385         }
 386         kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD);
 387         return retval;
 388 }
 389
 390 /* Remove cache interface for CPU device */
 391 static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
 392 {
 393         unsigned int cpu = sys_dev->id;
 394         unsigned long i;
 395
 396         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
 397                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
 398
 399         if (all_cpu_cache_info[cpu].kobj.parent) {
 400                 kobject_put(&all_cpu_cache_info[cpu].kobj);
 401                 memset(&all_cpu_cache_info[cpu].kobj,
 402                         0,
 403                         sizeof(struct kobject));
 404         }
 405
 406         cpu_cache_sysfs_exit(cpu);
 407
 408         return 0;
 409 }
 410
 411 /*
 412  * When a cpu is hot-plugged, do a check and initiate
 413  * cache kobject if necessary
 414  */
 415 static int __cpuinit cache_cpu_callback(struct notifier_block *nfb,
 416                 unsigned long action, void *hcpu)
 417 {
 418         unsigned int cpu = (unsigned long)hcpu;
 419         struct sys_device *sys_dev;
 420
 421         sys_dev = get_cpu_sysdev(cpu);
 422         switch (action) {
 423         case CPU_ONLINE:
 424         case CPU_ONLINE_FROZEN:
 425                 cache_add_dev(sys_dev);
 426                 break;
 427         case CPU_DEAD:
 428         case CPU_DEAD_FROZEN:
 429                 cache_remove_dev(sys_dev);
 430                 break;
 431         }
 432         return NOTIFY_OK;
 433 }
 434
 435 static struct notifier_block __cpuinitdata cache_cpu_notifier =
 436 {
 437         .notifier_call = cache_cpu_callback
 438 };
 439
 440 static int __init cache_sysfs_init(void)
 441 {
 442         int i;
 443
 444         for_each_online_cpu(i) {
 445                 struct sys_device *sys_dev = get_cpu_sysdev((unsigned int)i);
 446                 cache_add_dev(sys_dev);
 447         }
 448
 449         register_hotcpu_notifier(&cache_cpu_notifier);
 450
 451         return 0;
 452 }
 453
 454 device_initcall(cache_sysfs_init);
 455