arch/s390/kernel/sysinfo.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright IBM Corp. 2001, 2009
   4  *  Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
   5  *             Martin Schwidefsky <schwidefsky@de.ibm.com>,
   6  */
   7
   8 #include <linux/debugfs.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/init.h>
  14 #include <linux/delay.h>
  15 #include <linux/export.h>
  16 #include <linux/slab.h>
  17 #include <asm/asm-extable.h>
  18 #include <asm/ebcdic.h>
  19 #include <asm/debug.h>
  20 #include <asm/sysinfo.h>
  21 #include <asm/cpcmd.h>
  22 #include <asm/topology.h>
  23 #include <asm/fpu.h>
  24
  25 int topology_max_mnest;
  26
  27 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
  28 {
  29         int r0 = (fc << 28) | sel1;
  30         int rc = 0;
  31
  32         asm volatile(
  33                 "       lr      0,%[r0]\n"
  34                 "       lr      1,%[r1]\n"
  35                 "       stsi    0(%[sysinfo])\n"
  36                 "0:     jz      2f\n"
  37                 "1:     lhi     %[rc],%[retval]\n"
  38                 "2:     lr      %[r0],0\n"
  39                 EX_TABLE(0b, 1b)
  40                 : [r0] "+d" (r0), [rc] "+d" (rc)
  41                 : [r1] "d" (sel2),
  42                   [sysinfo] "a" (sysinfo),
  43                   [retval] "K" (-EOPNOTSUPP)
  44                 : "cc", "0", "1", "memory");
  45         *lvl = ((unsigned int) r0) >> 28;
  46         return rc;
  47 }
  48
  49 /*
  50  * stsi - store system information
  51  *
  52  * Returns the current configuration level if function code 0 was specified.
  53  * Otherwise returns 0 on success or a negative value on error.
  54  */
  55 int stsi(void *sysinfo, int fc, int sel1, int sel2)
  56 {
  57         int lvl, rc;
  58
  59         rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
  60         if (rc)
  61                 return rc;
  62         return fc ? 0 : lvl;
  63 }
  64 EXPORT_SYMBOL(stsi);
  65
  66 #ifdef CONFIG_PROC_FS
  67
  68 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  69 {
  70         switch (encoding) {
  71         case 1: /* EBCDIC */
  72                 EBCASC(name, len);
  73                 break;
  74         case 2: /* UTF-8 */
  75                 break;
  76         default:
  77                 return false;
  78         }
  79         return true;
  80 }
  81
  82 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  83 {
  84         bool has_var_cap;
  85         int i;
  86
  87         if (stsi(info, 1, 1, 1))
  88                 return;
  89         has_var_cap = !!info->model_var_cap[0];
  90         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  91         EBCASC(info->type, sizeof(info->type));
  92         EBCASC(info->model, sizeof(info->model));
  93         EBCASC(info->sequence, sizeof(info->sequence));
  94         EBCASC(info->plant, sizeof(info->plant));
  95         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  96         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  97         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  98         if (has_var_cap)
  99                 EBCASC(info->model_var_cap, sizeof(info->model_var_cap));
 100         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
 101         seq_printf(m, "Type:                 %-4.4s\n", info->type);
 102         if (info->lic)
 103                 seq_printf(m, "LIC Identifier:       %016lx\n", info->lic);
 104         /*
 105          * Sigh: the model field has been renamed with System z9
 106          * to model_capacity and a new model field has been added
 107          * after the plant field. To avoid confusing older programs
 108          * the "Model:" prints "model_capacity model" or just
 109          * "model_capacity" if the model string is empty .
 110          */
 111         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
 112         if (info->model[0] != '\0')
 113                 seq_printf(m, " %-16.16s", info->model);
 114         seq_putc(m, '\n');
 115         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 116         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 117         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 118                    info->model_capacity, info->model_cap_rating);
 119         if (info->model_perm_cap_rating)
 120                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 121                            info->model_perm_cap,
 122                            info->model_perm_cap_rating);
 123         if (info->model_temp_cap_rating)
 124                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 125                            info->model_temp_cap,
 126                            info->model_temp_cap_rating);
 127         if (has_var_cap && info->model_var_cap_rating)
 128                 seq_printf(m, "Model Var. Capacity:  %-16.16s %08u\n",
 129                            info->model_var_cap,
 130                            info->model_var_cap_rating);
 131         if (info->ncr)
 132                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 133         if (info->npr)
 134                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 135         if (info->ntr)
 136                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 137         if (has_var_cap && info->nvr)
 138                 seq_printf(m, "Nominal Var. Rating:  %08u\n", info->nvr);
 139         if (info->cai) {
 140                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 141                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 142                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 143         }
 144         if (info->p) {
 145                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 146                         seq_printf(m, "Type %d Percentage:    %d\n",
 147                                    i, info->typepct[i - 1]);
 148                 }
 149         }
 150 }
 151
 152 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 153 {
 154         int i;
 155
 156         seq_putc(m, '\n');
 157         if (!MACHINE_HAS_TOPOLOGY)
 158                 return;
 159         if (stsi(info, 15, 1, topology_max_mnest))
 160                 return;
 161         seq_printf(m, "CPU Topology HW:     ");
 162         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 163                 seq_printf(m, " %d", info->mag[i]);
 164         seq_putc(m, '\n');
 165 #ifdef CONFIG_SCHED_TOPOLOGY
 166         store_topology(info);
 167         seq_printf(m, "CPU Topology SW:     ");
 168         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 169                 seq_printf(m, " %d", info->mag[i]);
 170         seq_putc(m, '\n');
 171 #endif
 172 }
 173
 174 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 175 {
 176         struct sysinfo_1_2_2_extension *ext;
 177         int i;
 178
 179         if (stsi(info, 1, 2, 2))
 180                 return;
 181         ext = (struct sysinfo_1_2_2_extension *)
 182                 ((unsigned long) info + info->acc_offset);
 183         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 184         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 185         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 186         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 187         if (info->mt_installed) {
 188                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 189                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 190         }
 191         /*
 192          * Sigh 2. According to the specification the alternate
 193          * capability field is a 32 bit floating point number
 194          * if the higher order 8 bits are not zero. Printing
 195          * a floating point number in the kernel is a no-no,
 196          * always print the number as 32 bit unsigned integer.
 197          * The user-space needs to know about the strange
 198          * encoding of the alternate cpu capability.
 199          */
 200         seq_printf(m, "Capability:           %u", info->capability);
 201         if (info->format == 1)
 202                 seq_printf(m, " %u", ext->alt_capability);
 203         seq_putc(m, '\n');
 204         if (info->nominal_cap)
 205                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 206         if (info->secondary_cap)
 207                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 208         for (i = 2; i <= info->cpus_total; i++) {
 209                 seq_printf(m, "Adjustment %02d-way:    %u",
 210                            i, info->adjustment[i-2]);
 211                 if (info->format == 1)
 212                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 213                 seq_putc(m, '\n');
 214         }
 215 }
 216
 217 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 218 {
 219         if (stsi(info, 2, 2, 2))
 220                 return;
 221         EBCASC(info->name, sizeof(info->name));
 222         seq_putc(m, '\n');
 223         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 224         seq_printf(m, "LPAR Characteristics: ");
 225         if (info->characteristics & LPAR_CHAR_DEDICATED)
 226                 seq_printf(m, "Dedicated ");
 227         if (info->characteristics & LPAR_CHAR_SHARED)
 228                 seq_printf(m, "Shared ");
 229         if (info->characteristics & LPAR_CHAR_LIMITED)
 230                 seq_printf(m, "Limited ");
 231         seq_putc(m, '\n');
 232         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 233         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 234         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 235         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 236         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 237         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 238         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 239         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 240         if (info->mt_installed) {
 241                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 242                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 243                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 244         }
 245         if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 246                 seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 247                 seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 248         }
 249 }
 250
 251 static void print_ext_name(struct seq_file *m, int lvl,
 252                            struct sysinfo_3_2_2 *info)
 253 {
 254         size_t len = sizeof(info->ext_names[lvl]);
 255
 256         if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 257                 return;
 258         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 259                    info->ext_names[lvl]);
 260 }
 261
 262 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 263 {
 264         if (uuid_is_null(&info->vm[i].uuid))
 265                 return;
 266         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 267 }
 268
 269 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 270 {
 271         int i;
 272
 273         if (stsi(info, 3, 2, 2))
 274                 return;
 275         for (i = 0; i < info->count; i++) {
 276                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 277                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 278                 seq_putc(m, '\n');
 279                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 280                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 281                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 282                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 283                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 284                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 285                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 286                 print_ext_name(m, i, info);
 287                 print_uuid(m, i, info);
 288         }
 289 }
 290
 291 static int sysinfo_show(struct seq_file *m, void *v)
 292 {
 293         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 294         int level;
 295
 296         if (!info)
 297                 return 0;
 298         level = stsi(NULL, 0, 0, 0);
 299         if (level >= 1)
 300                 stsi_1_1_1(m, info);
 301         if (level >= 1)
 302                 stsi_15_1_x(m, info);
 303         if (level >= 1)
 304                 stsi_1_2_2(m, info);
 305         if (level >= 2)
 306                 stsi_2_2_2(m, info);
 307         if (level >= 3)
 308                 stsi_3_2_2(m, info);
 309         free_page((unsigned long)info);
 310         return 0;
 311 }
 312
 313 static int __init sysinfo_create_proc(void)
 314 {
 315         proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
 316         return 0;
 317 }
 318 device_initcall(sysinfo_create_proc);
 319
 320 #endif /* CONFIG_PROC_FS */
 321
 322 /*
 323  * Service levels interface.
 324  */
 325
 326 static DECLARE_RWSEM(service_level_sem);
 327 static LIST_HEAD(service_level_list);
 328
 329 int register_service_level(struct service_level *slr)
 330 {
 331         struct service_level *ptr;
 332
 333         down_write(&service_level_sem);
 334         list_for_each_entry(ptr, &service_level_list, list)
 335                 if (ptr == slr) {
 336                         up_write(&service_level_sem);
 337                         return -EEXIST;
 338                 }
 339         list_add_tail(&slr->list, &service_level_list);
 340         up_write(&service_level_sem);
 341         return 0;
 342 }
 343 EXPORT_SYMBOL(register_service_level);
 344
 345 int unregister_service_level(struct service_level *slr)
 346 {
 347         struct service_level *ptr, *next;
 348         int rc = -ENOENT;
 349
 350         down_write(&service_level_sem);
 351         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 352                 if (ptr != slr)
 353                         continue;
 354                 list_del(&ptr->list);
 355                 rc = 0;
 356                 break;
 357         }
 358         up_write(&service_level_sem);
 359         return rc;
 360 }
 361 EXPORT_SYMBOL(unregister_service_level);
 362
 363 static void *service_level_start(struct seq_file *m, loff_t *pos)
 364 {
 365         down_read(&service_level_sem);
 366         return seq_list_start(&service_level_list, *pos);
 367 }
 368
 369 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 370 {
 371         return seq_list_next(p, &service_level_list, pos);
 372 }
 373
 374 static void service_level_stop(struct seq_file *m, void *p)
 375 {
 376         up_read(&service_level_sem);
 377 }
 378
 379 static int service_level_show(struct seq_file *m, void *p)
 380 {
 381         struct service_level *slr;
 382
 383         slr = list_entry(p, struct service_level, list);
 384         slr->seq_print(m, slr);
 385         return 0;
 386 }
 387
 388 static const struct seq_operations service_level_seq_ops = {
 389         .start          = service_level_start,
 390         .next           = service_level_next,
 391         .stop           = service_level_stop,
 392         .show           = service_level_show
 393 };
 394
 395 static void service_level_vm_print(struct seq_file *m,
 396                                    struct service_level *slr)
 397 {
 398         char *query_buffer, *str;
 399
 400         query_buffer = kmalloc(1024, GFP_KERNEL);
 401         if (!query_buffer)
 402                 return;
 403         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 404         str = strchr(query_buffer, '\n');
 405         if (str)
 406                 *str = 0;
 407         seq_printf(m, "VM: %s\n", query_buffer);
 408         kfree(query_buffer);
 409 }
 410
 411 static struct service_level service_level_vm = {
 412         .seq_print = service_level_vm_print
 413 };
 414
 415 static __init int create_proc_service_level(void)
 416 {
 417         proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
 418         if (MACHINE_IS_VM)
 419                 register_service_level(&service_level_vm);
 420         return 0;
 421 }
 422 subsys_initcall(create_proc_service_level);
 423
 424 /*
 425  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 426  */
 427 void s390_adjust_jiffies(void)
 428 {
 429         DECLARE_KERNEL_FPU_ONSTACK16(fpu);
 430         struct sysinfo_1_2_2 *info;
 431         unsigned long capability;
 432
 433         info = (void *) get_zeroed_page(GFP_KERNEL);
 434         if (!info)
 435                 return;
 436
 437         if (stsi(info, 1, 2, 2) == 0) {
 438                 /*
 439                  * Major sigh. The cpu capability encoding is "special".
 440                  * If the first 9 bits of info->capability are 0 then it
 441                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 442                  * If the first 9 bits are != 0 then it is a 32 bit float.
 443                  * In addition a lower value indicates a proportionally
 444                  * higher cpu capacity. Bogomips are the other way round.
 445                  * To get to a halfway suitable number we divide 1e7
 446                  * by the cpu capability number. Yes, that means a floating
 447                  * point division ..
 448                  */
 449                 kernel_fpu_begin(&fpu, KERNEL_FPR);
 450                 fpu_sfpc(0);
 451                 if (info->capability & 0xff800000)
 452                         fpu_ldgr(2, info->capability);
 453                 else
 454                         fpu_cefbr(2, info->capability);
 455                 fpu_cefbr(0, 10000000);
 456                 fpu_debr(0, 2);
 457                 capability = fpu_cgebr(0, 5);
 458                 kernel_fpu_end(&fpu, KERNEL_FPR);
 459         } else
 460                 /*
 461                  * Really old machine without stsi block for basic
 462                  * cpu information. Report 42.0 bogomips.
 463                  */
 464                 capability = 42;
 465         loops_per_jiffy = capability * (500000/HZ);
 466         free_page((unsigned long) info);
 467 }
 468
 469 /*
 470  * calibrate the delay loop
 471  */
 472 void calibrate_delay(void)
 473 {
 474         s390_adjust_jiffies();
 475         /* Print the good old Bogomips line .. */
 476         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 477                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 478                (loops_per_jiffy/(5000/HZ)) % 100);
 479 }
 480
 481 #ifdef CONFIG_DEBUG_FS
 482
 483 #define STSI_FILE(fc, s1, s2)                                                  \
 484 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
 485 {                                                                              \
 486         file->private_data = (void *) get_zeroed_page(GFP_KERNEL);             \
 487         if (!file->private_data)                                               \
 488                 return -ENOMEM;                                                \
 489         if (stsi(file->private_data, fc, s1, s2)) {                            \
 490                 free_page((unsigned long)file->private_data);                  \
 491                 file->private_data = NULL;                                     \
 492                 return -EACCES;                                                \
 493         }                                                                      \
 494         return nonseekable_open(inode, file);                                  \
 495 }                                                                              \
 496                                                                                \
 497 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
 498         .open           = stsi_open_##fc##_##s1##_##s2,                        \
 499         .release        = stsi_release,                                        \
 500         .read           = stsi_read,                                           \
 501         .llseek         = no_llseek,                                           \
 502 };
 503
 504 static int stsi_release(struct inode *inode, struct file *file)
 505 {
 506         free_page((unsigned long)file->private_data);
 507         return 0;
 508 }
 509
 510 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 511 {
 512         return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
 513 }
 514
 515 STSI_FILE( 1, 1, 1);
 516 STSI_FILE( 1, 2, 1);
 517 STSI_FILE( 1, 2, 2);
 518 STSI_FILE( 2, 2, 1);
 519 STSI_FILE( 2, 2, 2);
 520 STSI_FILE( 3, 2, 2);
 521 STSI_FILE(15, 1, 2);
 522 STSI_FILE(15, 1, 3);
 523 STSI_FILE(15, 1, 4);
 524 STSI_FILE(15, 1, 5);
 525 STSI_FILE(15, 1, 6);
 526
 527 struct stsi_file {
 528         const struct file_operations *fops;
 529         char *name;
 530 };
 531
 532 static struct stsi_file stsi_file[] __initdata = {
 533         {.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
 534         {.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
 535         {.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
 536         {.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
 537         {.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
 538         {.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
 539         {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
 540         {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
 541         {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
 542         {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
 543         {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
 544 };
 545
 546 static u8 stsi_0_0_0;
 547
 548 static __init int stsi_init_debugfs(void)
 549 {
 550         struct dentry *stsi_root;
 551         struct stsi_file *sf;
 552         int lvl, i;
 553
 554         stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
 555         lvl = stsi(NULL, 0, 0, 0);
 556         if (lvl > 0)
 557                 stsi_0_0_0 = lvl;
 558         debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
 559         for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
 560                 sf = &stsi_file[i];
 561                 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
 562         }
 563         if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
 564                 char link_to[10];
 565
 566                 sprintf(link_to, "15_1_%d", topology_mnest_limit());
 567                 debugfs_create_symlink("topology", stsi_root, link_to);
 568         }
 569         return 0;
 570 }
 571 device_initcall(stsi_init_debugfs);
 572
 573 #endif /* CONFIG_DEBUG_FS */