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 are used on
   7  * NUMA machines with contiguous memory.
   8  *              2002/08/07 Erich Focht <efocht@ess.nec.de>
   9  * Populate cpu entries in sysfs for non-numa systems as well
  10  *      Intel Corporation - Ashok Raj
  11  * 02/27/2006 Zhang, Yanmin
  12  *      Populate cpu cache entries in sysfs for cpu cache info
  13  */
  14
  15 #include <linux/cpu.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/node.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/memblock.h>
  22 #include <linux/nodemask.h>
  23 #include <linux/notifier.h>
  24 #include <linux/export.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 void arch_fix_phys_package_id(int num, u32 slot)
  32 {
  33 #ifdef CONFIG_SMP
  34         if (cpu_data(num)->socket_id == -1)
  35                 cpu_data(num)->socket_id = slot;
  36 #endif
  37 }
  38 EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
  39
  40
  41 #ifdef CONFIG_HOTPLUG_CPU
  42 int __ref arch_register_cpu(int num)
  43 {
  44         /*
  45          * If CPEI can be re-targeted 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         return register_cpu(&sysfs_cpus[num].cpu, num);
  52 }
  53 EXPORT_SYMBOL(arch_register_cpu);
  54
  55 void __ref arch_unregister_cpu(int num)
  56 {
  57         unregister_cpu(&sysfs_cpus[num].cpu);
  58         unmap_cpu_from_node(num, cpu_to_node(num));
  59 }
  60 EXPORT_SYMBOL(arch_unregister_cpu);
  61 #else
  62 static int __init arch_register_cpu(int num)
  63 {
  64         return register_cpu(&sysfs_cpus[num].cpu, num);
  65 }
  66 #endif /*CONFIG_HOTPLUG_CPU*/
  67
  68
  69 static int __init topology_init(void)
  70 {
  71         int i, err = 0;
  72
  73 #ifdef CONFIG_NUMA
  74         /*
  75          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  76          */
  77         for_each_online_node(i) {
  78                 if ((err = register_one_node(i)))
  79                         goto out;
  80         }
  81 #endif
  82
  83         sysfs_cpus = kcalloc(NR_CPUS, sizeof(struct ia64_cpu), GFP_KERNEL);
  84         if (!sysfs_cpus)
  85                 panic("kzalloc in topology_init failed - NR_CPUS too big?");
  86
  87         for_each_present_cpu(i) {
  88                 if((err = arch_register_cpu(i)))
  89                         goto out;
  90         }
  91 out:
  92         return err;
  93 }
  94
  95 subsys_initcall(topology_init);
  96
  97
  98 /*
  99  * Export cpu cache information through sysfs
 100  */
 101
 102 /*
 103  *  A bunch of string array to get pretty printing
 104  */
 105 static const char *cache_types[] = {
 106         "",                     /* not used */
 107         "Instruction",
 108         "Data",
 109         "Unified"       /* unified */
 110 };
 111
 112 static const char *cache_mattrib[]={
 113         "WriteThrough",
 114         "WriteBack",
 115         "",             /* reserved */
 116         ""              /* reserved */
 117 };
 118
 119 struct cache_info {
 120         pal_cache_config_info_t cci;
 121         cpumask_t shared_cpu_map;
 122         int level;
 123         int type;
 124         struct kobject kobj;
 125 };
 126
 127 struct cpu_cache_info {
 128         struct cache_info *cache_leaves;
 129         int     num_cache_leaves;
 130         struct kobject kobj;
 131 };
 132
 133 static struct cpu_cache_info    all_cpu_cache_info[NR_CPUS];
 134 #define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
 135
 136 #ifdef CONFIG_SMP
 137 static void cache_shared_cpu_map_setup(unsigned int cpu,
 138                 struct cache_info * this_leaf)
 139 {
 140         pal_cache_shared_info_t csi;
 141         int num_shared, i = 0;
 142         unsigned int j;
 143
 144         if (cpu_data(cpu)->threads_per_core <= 1 &&
 145                 cpu_data(cpu)->cores_per_socket <= 1) {
 146                 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
 147                 return;
 148         }
 149
 150         if (ia64_pal_cache_shared_info(this_leaf->level,
 151                                         this_leaf->type,
 152                                         0,
 153                                         &csi) != PAL_STATUS_SUCCESS)
 154                 return;
 155
 156         num_shared = (int) csi.num_shared;
 157         do {
 158                 for_each_possible_cpu(j)
 159                         if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
 160                                 && cpu_data(j)->core_id == csi.log1_cid
 161                                 && cpu_data(j)->thread_id == csi.log1_tid)
 162                                 cpumask_set_cpu(j, &this_leaf->shared_cpu_map);
 163
 164                 i++;
 165         } while (i < num_shared &&
 166                 ia64_pal_cache_shared_info(this_leaf->level,
 167                                 this_leaf->type,
 168                                 i,
 169                                 &csi) == PAL_STATUS_SUCCESS);
 170 }
 171 #else
 172 static void cache_shared_cpu_map_setup(unsigned int cpu,
 173                 struct cache_info * this_leaf)
 174 {
 175         cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
 176         return;
 177 }
 178 #endif
 179
 180 static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
 181                                         char *buf)
 182 {
 183         return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
 184 }
 185
 186 static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
 187                                         char *buf)
 188 {
 189         return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
 190 }
 191
 192 static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
 193 {
 194         return sprintf(buf,
 195                         "%s\n",
 196                         cache_mattrib[this_leaf->cci.pcci_cache_attr]);
 197 }
 198
 199 static ssize_t show_size(struct cache_info *this_leaf, char *buf)
 200 {
 201         return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
 202 }
 203
 204 static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
 205 {
 206         unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
 207         number_of_sets /= this_leaf->cci.pcci_assoc;
 208         number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
 209
 210         return sprintf(buf, "%u\n", number_of_sets);
 211 }
 212
 213 static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
 214 {
 215         cpumask_t shared_cpu_map;
 216
 217         cpumask_and(&shared_cpu_map,
 218                                 &this_leaf->shared_cpu_map, cpu_online_mask);
 219         return scnprintf(buf, PAGE_SIZE, "%*pb\n",
 220                          cpumask_pr_args(&shared_cpu_map));
 221 }
 222
 223 static ssize_t show_type(struct cache_info *this_leaf, char *buf)
 224 {
 225         int type = this_leaf->type + this_leaf->cci.pcci_unified;
 226         return sprintf(buf, "%s\n", cache_types[type]);
 227 }
 228
 229 static ssize_t show_level(struct cache_info *this_leaf, char *buf)
 230 {
 231         return sprintf(buf, "%u\n", this_leaf->level);
 232 }
 233
 234 struct cache_attr {
 235         struct attribute attr;
 236         ssize_t (*show)(struct cache_info *, char *);
 237         ssize_t (*store)(struct cache_info *, const char *, size_t count);
 238 };
 239
 240 #ifdef define_one_ro
 241         #undef define_one_ro
 242 #endif
 243 #define define_one_ro(_name) \
 244         static struct cache_attr _name = \
 245 __ATTR(_name, 0444, show_##_name, NULL)
 246
 247 define_one_ro(level);
 248 define_one_ro(type);
 249 define_one_ro(coherency_line_size);
 250 define_one_ro(ways_of_associativity);
 251 define_one_ro(size);
 252 define_one_ro(number_of_sets);
 253 define_one_ro(shared_cpu_map);
 254 define_one_ro(attributes);
 255
 256 static struct attribute * cache_default_attrs[] = {
 257         &type.attr,
 258         &level.attr,
 259         &coherency_line_size.attr,
 260         &ways_of_associativity.attr,
 261         &attributes.attr,
 262         &size.attr,
 263         &number_of_sets.attr,
 264         &shared_cpu_map.attr,
 265         NULL
 266 };
 267
 268 #define to_object(k) container_of(k, struct cache_info, kobj)
 269 #define to_attr(a) container_of(a, struct cache_attr, attr)
 270
 271 static ssize_t ia64_cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
 272 {
 273         struct cache_attr *fattr = to_attr(attr);
 274         struct cache_info *this_leaf = to_object(kobj);
 275         ssize_t ret;
 276
 277         ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
 278         return ret;
 279 }
 280
 281 static const struct sysfs_ops cache_sysfs_ops = {
 282         .show   = ia64_cache_show
 283 };
 284
 285 static struct kobj_type cache_ktype = {
 286         .sysfs_ops      = &cache_sysfs_ops,
 287         .default_attrs  = cache_default_attrs,
 288 };
 289
 290 static struct kobj_type cache_ktype_percpu_entry = {
 291         .sysfs_ops      = &cache_sysfs_ops,
 292 };
 293
 294 static void cpu_cache_sysfs_exit(unsigned int cpu)
 295 {
 296         kfree(all_cpu_cache_info[cpu].cache_leaves);
 297         all_cpu_cache_info[cpu].cache_leaves = NULL;
 298         all_cpu_cache_info[cpu].num_cache_leaves = 0;
 299         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 300         return;
 301 }
 302
 303 static int cpu_cache_sysfs_init(unsigned int cpu)
 304 {
 305         unsigned long i, levels, unique_caches;
 306         pal_cache_config_info_t cci;
 307         int j;
 308         long status;
 309         struct cache_info *this_cache;
 310         int num_cache_leaves = 0;
 311
 312         if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
 313                 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
 314                 return -1;
 315         }
 316
 317         this_cache=kcalloc(unique_caches, sizeof(struct cache_info),
 318                            GFP_KERNEL);
 319         if (this_cache == NULL)
 320                 return -ENOMEM;
 321
 322         for (i=0; i < levels; i++) {
 323                 for (j=2; j >0 ; j--) {
 324                         if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
 325                                         PAL_STATUS_SUCCESS)
 326                                 continue;
 327
 328                         this_cache[num_cache_leaves].cci = cci;
 329                         this_cache[num_cache_leaves].level = i + 1;
 330                         this_cache[num_cache_leaves].type = j;
 331
 332                         cache_shared_cpu_map_setup(cpu,
 333                                         &this_cache[num_cache_leaves]);
 334                         num_cache_leaves ++;
 335                 }
 336         }
 337
 338         all_cpu_cache_info[cpu].cache_leaves = this_cache;
 339         all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
 340
 341         memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
 342
 343         return 0;
 344 }
 345
 346 /* Add cache interface for CPU device */
 347 static int cache_add_dev(unsigned int cpu)
 348 {
 349         struct device *sys_dev = get_cpu_device(cpu);
 350         unsigned long i, j;
 351         struct cache_info *this_object;
 352         int retval = 0;
 353
 354         if (all_cpu_cache_info[cpu].kobj.parent)
 355                 return 0;
 356
 357
 358         retval = cpu_cache_sysfs_init(cpu);
 359         if (unlikely(retval < 0))
 360                 return retval;
 361
 362         retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
 363                                       &cache_ktype_percpu_entry, &sys_dev->kobj,
 364                                       "%s", "cache");
 365         if (unlikely(retval < 0)) {
 366                 cpu_cache_sysfs_exit(cpu);
 367                 return retval;
 368         }
 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                         return retval;
 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 cache_remove_dev(unsigned int cpu)
 392 {
 393         unsigned long i;
 394
 395         for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
 396                 kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
 397
 398         if (all_cpu_cache_info[cpu].kobj.parent) {
 399                 kobject_put(&all_cpu_cache_info[cpu].kobj);
 400                 memset(&all_cpu_cache_info[cpu].kobj,
 401                         0,
 402                         sizeof(struct kobject));
 403         }
 404
 405         cpu_cache_sysfs_exit(cpu);
 406
 407         return 0;
 408 }
 409
 410 static int __init cache_sysfs_init(void)
 411 {
 412         int ret;
 413
 414         ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/topology:online",
 415                                 cache_add_dev, cache_remove_dev);
 416         WARN_ON(ret < 0);
 417         return 0;
 418 }
 419 device_initcall(cache_sysfs_init);