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/ebcdic.h>
  18 #include <asm/debug.h>
  19 #include <asm/sysinfo.h>
  20 #include <asm/cpcmd.h>
  21 #include <asm/topology.h>
  22 #include <asm/fpu/api.h>
  23
  24 int topology_max_mnest;
  25
  26 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
  27 {
  28         register int r0 asm("0") = (fc << 28) | sel1;
  29         register int r1 asm("1") = sel2;
  30         int rc = 0;
  31
  32         asm volatile(
  33                 "       stsi    0(%3)\n"
  34                 "0:     jz      2f\n"
  35                 "1:     lhi     %1,%4\n"
  36                 "2:\n"
  37                 EX_TABLE(0b, 1b)
  38                 : "+d" (r0), "+d" (rc)
  39                 : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
  40                 : "cc", "memory");
  41         *lvl = ((unsigned int) r0) >> 28;
  42         return rc;
  43 }
  44
  45 /*
  46  * stsi - store system information
  47  *
  48  * Returns the current configuration level if function code 0 was specified.
  49  * Otherwise returns 0 on success or a negative value on error.
  50  */
  51 int stsi(void *sysinfo, int fc, int sel1, int sel2)
  52 {
  53         int lvl, rc;
  54
  55         rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
  56         if (rc)
  57                 return rc;
  58         return fc ? 0 : lvl;
  59 }
  60 EXPORT_SYMBOL(stsi);
  61
  62 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  63 {
  64         switch (encoding) {
  65         case 1: /* EBCDIC */
  66                 EBCASC(name, len);
  67                 break;
  68         case 2: /* UTF-8 */
  69                 break;
  70         default:
  71                 return false;
  72         }
  73         return true;
  74 }
  75
  76 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  77 {
  78         int i;
  79
  80         if (stsi(info, 1, 1, 1))
  81                 return;
  82         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  83         EBCASC(info->type, sizeof(info->type));
  84         EBCASC(info->model, sizeof(info->model));
  85         EBCASC(info->sequence, sizeof(info->sequence));
  86         EBCASC(info->plant, sizeof(info->plant));
  87         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  88         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  89         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  90         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  91         seq_printf(m, "Type:                 %-4.4s\n", info->type);
  92         /*
  93          * Sigh: the model field has been renamed with System z9
  94          * to model_capacity and a new model field has been added
  95          * after the plant field. To avoid confusing older programs
  96          * the "Model:" prints "model_capacity model" or just
  97          * "model_capacity" if the model string is empty .
  98          */
  99         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
 100         if (info->model[0] != '\0')
 101                 seq_printf(m, " %-16.16s", info->model);
 102         seq_putc(m, '\n');
 103         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 104         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 105         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 106                    info->model_capacity, info->model_cap_rating);
 107         if (info->model_perm_cap_rating)
 108                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 109                            info->model_perm_cap,
 110                            info->model_perm_cap_rating);
 111         if (info->model_temp_cap_rating)
 112                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 113                            info->model_temp_cap,
 114                            info->model_temp_cap_rating);
 115         if (info->ncr)
 116                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 117         if (info->npr)
 118                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 119         if (info->ntr)
 120                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 121         if (info->cai) {
 122                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 123                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 124                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 125         }
 126         if (info->p) {
 127                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 128                         seq_printf(m, "Type %d Percentage:    %d\n",
 129                                    i, info->typepct[i - 1]);
 130                 }
 131         }
 132 }
 133
 134 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 135 {
 136         int i;
 137
 138         seq_putc(m, '\n');
 139         if (!MACHINE_HAS_TOPOLOGY)
 140                 return;
 141         if (stsi(info, 15, 1, topology_max_mnest))
 142                 return;
 143         seq_printf(m, "CPU Topology HW:     ");
 144         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 145                 seq_printf(m, " %d", info->mag[i]);
 146         seq_putc(m, '\n');
 147 #ifdef CONFIG_SCHED_TOPOLOGY
 148         store_topology(info);
 149         seq_printf(m, "CPU Topology SW:     ");
 150         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 151                 seq_printf(m, " %d", info->mag[i]);
 152         seq_putc(m, '\n');
 153 #endif
 154 }
 155
 156 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 157 {
 158         struct sysinfo_1_2_2_extension *ext;
 159         int i;
 160
 161         if (stsi(info, 1, 2, 2))
 162                 return;
 163         ext = (struct sysinfo_1_2_2_extension *)
 164                 ((unsigned long) info + info->acc_offset);
 165         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 166         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 167         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 168         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 169         if (info->mt_installed) {
 170                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 171                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 172         }
 173         /*
 174          * Sigh 2. According to the specification the alternate
 175          * capability field is a 32 bit floating point number
 176          * if the higher order 8 bits are not zero. Printing
 177          * a floating point number in the kernel is a no-no,
 178          * always print the number as 32 bit unsigned integer.
 179          * The user-space needs to know about the strange
 180          * encoding of the alternate cpu capability.
 181          */
 182         seq_printf(m, "Capability:           %u", info->capability);
 183         if (info->format == 1)
 184                 seq_printf(m, " %u", ext->alt_capability);
 185         seq_putc(m, '\n');
 186         if (info->nominal_cap)
 187                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 188         if (info->secondary_cap)
 189                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 190         for (i = 2; i <= info->cpus_total; i++) {
 191                 seq_printf(m, "Adjustment %02d-way:    %u",
 192                            i, info->adjustment[i-2]);
 193                 if (info->format == 1)
 194                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 195                 seq_putc(m, '\n');
 196         }
 197 }
 198
 199 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 200 {
 201         if (stsi(info, 2, 2, 2))
 202                 return;
 203         EBCASC(info->name, sizeof(info->name));
 204         seq_putc(m, '\n');
 205         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 206         seq_printf(m, "LPAR Characteristics: ");
 207         if (info->characteristics & LPAR_CHAR_DEDICATED)
 208                 seq_printf(m, "Dedicated ");
 209         if (info->characteristics & LPAR_CHAR_SHARED)
 210                 seq_printf(m, "Shared ");
 211         if (info->characteristics & LPAR_CHAR_LIMITED)
 212                 seq_printf(m, "Limited ");
 213         seq_putc(m, '\n');
 214         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 215         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 216         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 217         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 218         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 219         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 220         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 221         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 222         if (info->mt_installed) {
 223                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 224                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 225                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 226         }
 227         if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 228                 seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 229                 seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 230         }
 231 }
 232
 233 static void print_ext_name(struct seq_file *m, int lvl,
 234                            struct sysinfo_3_2_2 *info)
 235 {
 236         size_t len = sizeof(info->ext_names[lvl]);
 237
 238         if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 239                 return;
 240         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 241                    info->ext_names[lvl]);
 242 }
 243
 244 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 245 {
 246         if (uuid_is_null(&info->vm[i].uuid))
 247                 return;
 248         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 249 }
 250
 251 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 252 {
 253         int i;
 254
 255         if (stsi(info, 3, 2, 2))
 256                 return;
 257         for (i = 0; i < info->count; i++) {
 258                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 259                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 260                 seq_putc(m, '\n');
 261                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 262                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 263                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 264                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 265                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 266                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 267                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 268                 print_ext_name(m, i, info);
 269                 print_uuid(m, i, info);
 270         }
 271 }
 272
 273 static int sysinfo_show(struct seq_file *m, void *v)
 274 {
 275         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 276         int level;
 277
 278         if (!info)
 279                 return 0;
 280         level = stsi(NULL, 0, 0, 0);
 281         if (level >= 1)
 282                 stsi_1_1_1(m, info);
 283         if (level >= 1)
 284                 stsi_15_1_x(m, info);
 285         if (level >= 1)
 286                 stsi_1_2_2(m, info);
 287         if (level >= 2)
 288                 stsi_2_2_2(m, info);
 289         if (level >= 3)
 290                 stsi_3_2_2(m, info);
 291         free_page((unsigned long)info);
 292         return 0;
 293 }
 294
 295 static int sysinfo_open(struct inode *inode, struct file *file)
 296 {
 297         return single_open(file, sysinfo_show, NULL);
 298 }
 299
 300 static const struct file_operations sysinfo_fops = {
 301         .open           = sysinfo_open,
 302         .read           = seq_read,
 303         .llseek         = seq_lseek,
 304         .release        = single_release,
 305 };
 306
 307 static int __init sysinfo_create_proc(void)
 308 {
 309         proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
 310         return 0;
 311 }
 312 device_initcall(sysinfo_create_proc);
 313
 314 /*
 315  * Service levels interface.
 316  */
 317
 318 static DECLARE_RWSEM(service_level_sem);
 319 static LIST_HEAD(service_level_list);
 320
 321 int register_service_level(struct service_level *slr)
 322 {
 323         struct service_level *ptr;
 324
 325         down_write(&service_level_sem);
 326         list_for_each_entry(ptr, &service_level_list, list)
 327                 if (ptr == slr) {
 328                         up_write(&service_level_sem);
 329                         return -EEXIST;
 330                 }
 331         list_add_tail(&slr->list, &service_level_list);
 332         up_write(&service_level_sem);
 333         return 0;
 334 }
 335 EXPORT_SYMBOL(register_service_level);
 336
 337 int unregister_service_level(struct service_level *slr)
 338 {
 339         struct service_level *ptr, *next;
 340         int rc = -ENOENT;
 341
 342         down_write(&service_level_sem);
 343         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 344                 if (ptr != slr)
 345                         continue;
 346                 list_del(&ptr->list);
 347                 rc = 0;
 348                 break;
 349         }
 350         up_write(&service_level_sem);
 351         return rc;
 352 }
 353 EXPORT_SYMBOL(unregister_service_level);
 354
 355 static void *service_level_start(struct seq_file *m, loff_t *pos)
 356 {
 357         down_read(&service_level_sem);
 358         return seq_list_start(&service_level_list, *pos);
 359 }
 360
 361 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 362 {
 363         return seq_list_next(p, &service_level_list, pos);
 364 }
 365
 366 static void service_level_stop(struct seq_file *m, void *p)
 367 {
 368         up_read(&service_level_sem);
 369 }
 370
 371 static int service_level_show(struct seq_file *m, void *p)
 372 {
 373         struct service_level *slr;
 374
 375         slr = list_entry(p, struct service_level, list);
 376         slr->seq_print(m, slr);
 377         return 0;
 378 }
 379
 380 static const struct seq_operations service_level_seq_ops = {
 381         .start          = service_level_start,
 382         .next           = service_level_next,
 383         .stop           = service_level_stop,
 384         .show           = service_level_show
 385 };
 386
 387 static int service_level_open(struct inode *inode, struct file *file)
 388 {
 389         return seq_open(file, &service_level_seq_ops);
 390 }
 391
 392 static const struct file_operations service_level_ops = {
 393         .open           = service_level_open,
 394         .read           = seq_read,
 395         .llseek         = seq_lseek,
 396         .release        = seq_release
 397 };
 398
 399 static void service_level_vm_print(struct seq_file *m,
 400                                    struct service_level *slr)
 401 {
 402         char *query_buffer, *str;
 403
 404         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 405         if (!query_buffer)
 406                 return;
 407         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 408         str = strchr(query_buffer, '\n');
 409         if (str)
 410                 *str = 0;
 411         seq_printf(m, "VM: %s\n", query_buffer);
 412         kfree(query_buffer);
 413 }
 414
 415 static struct service_level service_level_vm = {
 416         .seq_print = service_level_vm_print
 417 };
 418
 419 static __init int create_proc_service_level(void)
 420 {
 421         proc_create("service_levels", 0, NULL, &service_level_ops);
 422         if (MACHINE_IS_VM)
 423                 register_service_level(&service_level_vm);
 424         return 0;
 425 }
 426 subsys_initcall(create_proc_service_level);
 427
 428 /*
 429  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 430  */
 431 void s390_adjust_jiffies(void)
 432 {
 433         struct sysinfo_1_2_2 *info;
 434         unsigned long capability;
 435         struct kernel_fpu fpu;
 436
 437         info = (void *) get_zeroed_page(GFP_KERNEL);
 438         if (!info)
 439                 return;
 440
 441         if (stsi(info, 1, 2, 2) == 0) {
 442                 /*
 443                  * Major sigh. The cpu capability encoding is "special".
 444                  * If the first 9 bits of info->capability are 0 then it
 445                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 446                  * If the first 9 bits are != 0 then it is a 32 bit float.
 447                  * In addition a lower value indicates a proportionally
 448                  * higher cpu capacity. Bogomips are the other way round.
 449                  * To get to a halfway suitable number we divide 1e7
 450                  * by the cpu capability number. Yes, that means a floating
 451                  * point division ..
 452                  */
 453                 kernel_fpu_begin(&fpu, KERNEL_FPR);
 454                 asm volatile(
 455                         "       sfpc    %3\n"
 456                         "       l       %0,%1\n"
 457                         "       tmlh    %0,0xff80\n"
 458                         "       jnz     0f\n"
 459                         "       cefbr   %%f2,%0\n"
 460                         "       j       1f\n"
 461                         "0:     le      %%f2,%1\n"
 462                         "1:     cefbr   %%f0,%2\n"
 463                         "       debr    %%f0,%%f2\n"
 464                         "       cgebr   %0,5,%%f0\n"
 465                         : "=&d" (capability)
 466                         : "Q" (info->capability), "d" (10000000), "d" (0)
 467                         : "cc"
 468                         );
 469                 kernel_fpu_end(&fpu, KERNEL_FPR);
 470         } else
 471                 /*
 472                  * Really old machine without stsi block for basic
 473                  * cpu information. Report 42.0 bogomips.
 474                  */
 475                 capability = 42;
 476         loops_per_jiffy = capability * (500000/HZ);
 477         free_page((unsigned long) info);
 478 }
 479
 480 /*
 481  * calibrate the delay loop
 482  */
 483 void calibrate_delay(void)
 484 {
 485         s390_adjust_jiffies();
 486         /* Print the good old Bogomips line .. */
 487         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 488                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 489                (loops_per_jiffy/(5000/HZ)) % 100);
 490 }
 491
 492 #ifdef CONFIG_DEBUG_FS
 493
 494 #define STSI_FILE(fc, s1, s2)                                                  \
 495 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
 496 {                                                                              \
 497         file->private_data = (void *) get_zeroed_page(GFP_KERNEL);             \
 498         if (!file->private_data)                                               \
 499                 return -ENOMEM;                                                \
 500         if (stsi(file->private_data, fc, s1, s2)) {                            \
 501                 free_page((unsigned long)file->private_data);                  \
 502                 file->private_data = NULL;                                     \
 503                 return -EACCES;                                                \
 504         }                                                                      \
 505         return nonseekable_open(inode, file);                                  \
 506 }                                                                              \
 507                                                                                \
 508 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
 509         .open           = stsi_open_##fc##_##s1##_##s2,                        \
 510         .release        = stsi_release,                                        \
 511         .read           = stsi_read,                                           \
 512         .llseek         = no_llseek,                                           \
 513 };
 514
 515 static int stsi_release(struct inode *inode, struct file *file)
 516 {
 517         free_page((unsigned long)file->private_data);
 518         return 0;
 519 }
 520
 521 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 522 {
 523         return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
 524 }
 525
 526 STSI_FILE( 1, 1, 1);
 527 STSI_FILE( 1, 2, 1);
 528 STSI_FILE( 1, 2, 2);
 529 STSI_FILE( 2, 2, 1);
 530 STSI_FILE( 2, 2, 2);
 531 STSI_FILE( 3, 2, 2);
 532 STSI_FILE(15, 1, 2);
 533 STSI_FILE(15, 1, 3);
 534 STSI_FILE(15, 1, 4);
 535 STSI_FILE(15, 1, 5);
 536 STSI_FILE(15, 1, 6);
 537
 538 struct stsi_file {
 539         const struct file_operations *fops;
 540         char *name;
 541 };
 542
 543 static struct stsi_file stsi_file[] __initdata = {
 544         {.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
 545         {.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
 546         {.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
 547         {.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
 548         {.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
 549         {.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
 550         {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
 551         {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
 552         {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
 553         {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
 554         {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
 555 };
 556
 557 static u8 stsi_0_0_0;
 558
 559 static __init int stsi_init_debugfs(void)
 560 {
 561         struct dentry *stsi_root;
 562         struct stsi_file *sf;
 563         int lvl, i;
 564
 565         stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
 566         if (IS_ERR_OR_NULL(stsi_root))
 567                 return 0;
 568         lvl = stsi(NULL, 0, 0, 0);
 569         if (lvl > 0)
 570                 stsi_0_0_0 = lvl;
 571         debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
 572         for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
 573                 sf = &stsi_file[i];
 574                 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
 575         }
 576         if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
 577                 char link_to[10];
 578
 579                 sprintf(link_to, "15_1_%d", topology_mnest_limit());
 580                 debugfs_create_symlink("topology", stsi_root, link_to);
 581         }
 582         return 0;
 583 }
 584 device_initcall(stsi_init_debugfs);
 585
 586 #endif /* CONFIG_DEBUG_FS */