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