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