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
  40 #ifdef CONFIG_HOTPLUG_CPU
  41 int __ref arch_register_cpu(int num)
  42 {
  43 #ifdef CONFIG_ACPI
  44         /*
  45          * If CPEI can be re-targetted or if this is not
  46          * CPEI target, then it is hotpluggable
  47          */
  48         if (can_cpei_retarget() || !is_cpu_cpei_target(num))
  49                 sysfs_cpus[num].cpu.hotpluggable = 1;
  50         map_cpu_to_node(num, node_cpuid[num].nid);
  51 #endif
  52         return register_cpu(&sysfs_cpus[num].cpu, num);
  53 }
  54 EXPORT_SYMBOL(arch_register_cpu);
  55
  56 void __ref arch_unregister_cpu(int num)
  57 {
  58         unregister_cpu(&sysfs_cpus[num].cpu);
  59 #ifdef CONFIG_ACPI
  60         unmap_cpu_from_node(num, cpu_to_node(num));
  61 #endif
  62 }
  63 EXPORT_SYMBOL(arch_unregister_cpu);
  64 #else
  65 static int __init arch_register_cpu(int num)
  66 {
  67         return register_cpu(&sysfs_cpus[num].cpu, num);
  68 }
  69 #endif /*CONFIG_HOTPLUG_CPU*/
  70
  71
  72 static int __init topology_init(void)
  73 {
  74         int i, err = 0;
  75
  76 #ifdef CONFIG_NUMA
  77         /*
  78          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  79          */
  80         for_each_online_node(i) {
  81                 if ((err = register_one_node(i)))
  82                         goto out;
  83         }
  84 #endif
  85
  86         sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
  87         if (!sysfs_cpus)
  88                 panic("kzalloc in topology_init failed - NR_CPUS too big?");
  89
  90         for_each_present_cpu(i) {
  91                 if((err = arch_register_cpu(i)))
  92                         goto out;
  93         }
  94 out:
  95         return err;
  96 }
  97
  98 subsys_initcall(topology_init);
  99
 100
 101 /*
 102  * Export cpu cache information through sysfs
 103  */
 104
 105 /*
 106  *  A bunch of string array to get pretty printing
 107  */
 108 static const char *cache_types[] = {
 109         "",                     /* not used */
 110         "Instruction",
 111         "Data",
 112         "Unified"       /* unified */
 113 };
 114
 115 static const char *cache_mattrib[]={
 116         "WriteThrough",
 117         "WriteBack",
 118         "",             /* reserved */
 119         ""              /* reserved */
 120 };
 121
 122 struct cache_info {
 123         pal_cache_config_info_t cci;
 124         cpumask_t shared_cpu_map;
 125         int level;
 126         int type;
 127         struct kobject kobj;
 128 };
 129
 130 struct cpu_cache_info {
 131         struct cache_info *cache_leaves;
 132         int     num_cache_leaves;
 133         struct kobject kobj;
 134 };
 135
 136 static struct cpu_cache_info    all_cpu_cache_info[NR_CPUS] __cpuinitdata;
 137 #define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
 138
 139 #ifdef CONFIG_SMP
 140 static void __cpuinit cache_shared_cpu_map_setup( unsigned int cpu,
 141                 struct cache_info * this_leaf)
 142 {
 143         pal_cache_shared_info_t csi;
 144         int num_shared, i = 0;
 145         unsigned int j;
 146
 147         if (cpu_data(cpu)->threads_per_core <= 1 &&
 148                 cpu_data(cpu)->cores_per_socket <= 1) {
 149                 cpu_set(cpu, this_leaf->shared_cpu_map);
 150                 return;
 151         }
 152
 153         if (ia64_pal_cache_shared_info(this_leaf->level,
 154                                         this_leaf->type,
 155                                         0,
 156                                         &csi) != PAL_STATUS_SUCCESS)
 157                 return;
 158
 159         num_shared = (int) csi.num_shared;
 160         do {
 161                 for_each_possible_cpu(j)
 162                         if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
 163                                 && cpu_data(j)->core_id == csi.log1_cid
 164                                 && cpu_data(j)->thread_id == csi.log1_tid)
 165                                 cpu_set(j, this_leaf->shared_cpu_map);
 166
 167                 i++;
 168         } while (i < num_shared &&
 169                 ia64_pal_cache_shared_info(this_leaf->level,
 170                                 this_leaf->type,
 171                                 i,
 172                                 &csi) == PAL_STATUS_SUCCESS);
 173 }
 174 #else
 175 static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu,
 176                 struct cache_info * this_leaf)
 177 {
 178         cpu_set(cpu, this_leaf->shared_cpu_map);
 179         return;
 180 }
 181 #endif
 182
 183 static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
 184                                         char *buf)
 185 {
 186         return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
 187 }
 188
 189 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
 190                                         char *buf)
 191 {
 192         return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
 193 }
 194
 195 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
 196 {
 197         return sprintf(buf,
 198                         "%s\n",
 199                         cache_mattrib[this_leaf->cci.pcci_cache_attr]);
 200 }
 201
 202 static ssize_t show_size(struct cache_info *this_leaf, char *buf)
 203 {
 204         return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
 205 }
 206
 207 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
 208 {
 209         unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
 210         number_of_sets /= this_leaf->cci.pcci_assoc;
 211         number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
 212
 213         return sprintf(buf, "%u\n", number_of_sets);
 214 }
 215
 216 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
 217 {
 218         ssize_t len;
 219         cpumask_t shared_cpu_map;
 220
 221         cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
 222         len = cpumask_scnprintf(buf, NR_CPUS+1, &shared_cpu_map);
 223         len += sprintf(buf+len, "\n");
 224         return len;
 225 }
 226
 227 static ssize_t show_type(struct cache_info *this_leaf, char *buf)
 228 {
 229         int type = this_leaf->type + this_leaf->cci.pcci_unified;
 230         return sprintf(buf, "%s\n", cache_types[type]);
 231 }
 232
 233 static ssize_t show_level(struct cache_info *this_leaf, char *buf)
 234 {
 235         return sprintf(buf, "%u\n", this_leaf->level);
 236 }
 237
 238 struct cache_attr {
 239         struct attribute attr;
 240         ssize_t (*show)(struct cache_info *, char *);
 241         ssize_t (*store)(struct cache_info *, const char *, size_t count);
 242 };
 243
 244 #ifdef define_one_ro
 245         #undef define_one_ro
 246 #endif
 247 #define define_one_ro(_name) \
 248         static struct cache_attr _name = \
 249 __ATTR(_name, 0444, show_##_name, NULL)
 250
 251 define_one_ro(level);
 252 define_one_ro(type);
 253 define_one_ro(coherency_line_size);
 254 define_one_ro(ways_of_associativity);
 255 define_one_ro(size);
 256 define_one_ro(number_of_sets);
 257 define_one_ro(shared_cpu_map);
 258 define_one_ro(attributes);
 259
 260 static struct attribute * cache_default_attrs[] = {
 261         &type.attr,
 262         &level.attr,
 263         &coherency_line_size.attr,
 264         &ways_of_associativity.attr,
 265         &attributes.attr,
 266         &size.attr,
 267         &number_of_sets.attr,
 268         &shared_cpu_map.attr,
 269         NULL
 270 };
 271
 272 #define to_object(k) container_of(k, struct cache_info, kobj)
 273 #define to_attr(a) container_of(a, struct cache_attr, attr)
 274
 275 static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
 276 {
 277         struct cache_attr *fattr = to_attr(attr);
 278         struct cache_info *this_leaf = to_object(kobj);
 279         ssize_t ret;
 280
 281         ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
 282         return ret;
 283 }
 284
 285 static struct sysfs_ops cache_sysfs_ops = {
 286         .show   = cache_show
 287 };
 288
 289 static struct kobj_type cache_ktype = {
 290         .sysfs_ops      = &cache_sysfs_ops,
 291         .default_attrs  = cache_default_attrs,
 292 };
 293
 294 static struct kobj_type cache_ktype_percpu_entry = {
 295         .sysfs_ops      = &cache_sysfs_ops,
 296 };
 297
 298 static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
 299 {
 300         kfree(all_cpu_cache_info[cpu].cache_leaves);
 301         all_cpu_cache_info[cpu].cache_leaves = NULL;
 302         all_cpu_cache_info[cpu].num_cache_leaves = 0;
 303         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 304         return;
 305 }
 306
 307 static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
 308 {
 309         u64 i, levels, unique_caches;
 310         pal_cache_config_info_t cci;
 311         int j;
 312         s64 status;
 313         struct cache_info *this_cache;
 314         int num_cache_leaves = 0;
 315
 316         if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
 317                 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
 318                 return -1;
 319         }
 320
 321         this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
 322                         GFP_KERNEL);
 323         if (this_cache == NULL)
 324                 return -ENOMEM;
 325
 326         for (i=0; i < levels; i++) {
 327                 for (j=2; j >0 ; j--) {
 328                         if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
 329                                         PAL_STATUS_SUCCESS)
 330                                 continue;
 331
 332                         this_cache[num_cache_leaves].cci = cci;
 333                         this_cache[num_cache_leaves].level = i + 1;
 334                         this_cache[num_cache_leaves].type = j;
 335
 336                         cache_shared_cpu_map_setup(cpu,
 337                                         &this_cache[num_cache_leaves]);
 338                         num_cache_leaves ++;
 339                 }
 340         }
 341
 342         all_cpu_cache_info[cpu].cache_leaves = this_cache;
 343         all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
 344
 345         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 346
 347         return 0;
 348 }
 349
 350 /* Add cache interface for CPU device */
 351 static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 352 {
 353         unsigned int cpu = sys_dev->id;
 354         unsigned long i, j;
 355         struct cache_info *this_object;
 356         int retval = 0;
 357         cpumask_t oldmask;
 358
 359         if (all_cpu_cache_info[cpu].kobj.parent)
 360                 return 0;
 361
 362         oldmask = current->cpus_allowed;
 363         retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
 364         if (unlikely(retval))
 365                 return retval;
 366
 367         retval = cpu_cache_sysfs_init(cpu);
 368         set_cpus_allowed(current, oldmask);
 369         if (unlikely(retval < 0))
 370                 return retval;
 371
 372         retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
 373                                       &cache_ktype_percpu_entry, &sys_dev->kobj,
 374                                       "%s", "cache");
 375
 376         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
 377                 this_object = LEAF_KOBJECT_PTR(cpu,i);
 378                 retval = kobject_init_and_add(&(this_object->kobj),
 379                                               &cache_ktype,
 380                                               &all_cpu_cache_info[cpu].kobj,
 381                                               "index%1lu", i);
 382                 if (unlikely(retval)) {
 383                         for (j = 0; j < i; j++) {
 384                                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
 385                         }
 386                         kobject_put(&all_cpu_cache_info[cpu].kobj);
 387                         cpu_cache_sysfs_exit(cpu);
 388                         break;
 389                 }
 390                 kobject_uevent(&(this_object->kobj), KOBJ_ADD);
 391         }
 392         kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD);
 393         return retval;
 394 }
 395
 396 /* Remove cache interface for CPU device */
 397 static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
 398 {
 399         unsigned int cpu = sys_dev->id;
 400         unsigned long i;
 401
 402         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
 403                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
 404
 405         if (all_cpu_cache_info[cpu].kobj.parent) {
 406                 kobject_put(&all_cpu_cache_info[cpu].kobj);
 407                 memset(&all_cpu_cache_info[cpu].kobj,
 408                         0,
 409                         sizeof(struct kobject));
 410         }
 411
 412         cpu_cache_sysfs_exit(cpu);
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * When a cpu is hot-plugged, do a check and initiate
 419  * cache kobject if necessary
 420  */
 421 static int __cpuinit cache_cpu_callback(struct notifier_block *nfb,
 422                 unsigned long action, void *hcpu)
 423 {
 424         unsigned int cpu = (unsigned long)hcpu;
 425         struct sys_device *sys_dev;
 426
 427         sys_dev = get_cpu_sysdev(cpu);
 428         switch (action) {
 429         case CPU_ONLINE:
 430         case CPU_ONLINE_FROZEN:
 431                 cache_add_dev(sys_dev);
 432                 break;
 433         case CPU_DEAD:
 434         case CPU_DEAD_FROZEN:
 435                 cache_remove_dev(sys_dev);
 436                 break;
 437         }
 438         return NOTIFY_OK;
 439 }
 440
 441 static struct notifier_block __cpuinitdata cache_cpu_notifier =
 442 {
 443         .notifier_call = cache_cpu_callback
 444 };
 445
 446 static int __init cache_sysfs_init(void)
 447 {
 448         int i;
 449
 450         for_each_online_cpu(i) {
 451                 struct sys_device *sys_dev = get_cpu_sysdev((unsigned int)i);
 452                 cache_add_dev(sys_dev);
 453         }
 454
 455         register_hotcpu_notifier(&cache_cpu_notifier);
 456
 457         return 0;
 458 }
 459
 460 device_initcall(cache_sysfs_init);
 461