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 #ifdef CONFIG_PROC_FS
  63
  64 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  65 {
  66         switch (encoding) {
  67         case 1: /* EBCDIC */
  68                 EBCASC(name, len);
  69                 break;
  70         case 2: /* UTF-8 */
  71                 break;
  72         default:
  73                 return false;
  74         }
  75         return true;
  76 }
  77
  78 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  79 {
  80         int i;
  81
  82         if (stsi(info, 1, 1, 1))
  83                 return;
  84         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  85         EBCASC(info->type, sizeof(info->type));
  86         EBCASC(info->model, sizeof(info->model));
  87         EBCASC(info->sequence, sizeof(info->sequence));
  88         EBCASC(info->plant, sizeof(info->plant));
  89         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  90         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  91         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  92         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  93         seq_printf(m, "Type:                 %-4.4s\n", info->type);
  94         /*
  95          * Sigh: the model field has been renamed with System z9
  96          * to model_capacity and a new model field has been added
  97          * after the plant field. To avoid confusing older programs
  98          * the "Model:" prints "model_capacity model" or just
  99          * "model_capacity" if the model string is empty .
 100          */
 101         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
 102         if (info->model[0] != '\0')
 103                 seq_printf(m, " %-16.16s", info->model);
 104         seq_putc(m, '\n');
 105         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 106         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 107         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 108                    info->model_capacity, info->model_cap_rating);
 109         if (info->model_perm_cap_rating)
 110                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 111                            info->model_perm_cap,
 112                            info->model_perm_cap_rating);
 113         if (info->model_temp_cap_rating)
 114                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 115                            info->model_temp_cap,
 116                            info->model_temp_cap_rating);
 117         if (info->ncr)
 118                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 119         if (info->npr)
 120                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 121         if (info->ntr)
 122                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 123         if (info->cai) {
 124                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 125                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 126                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 127         }
 128         if (info->p) {
 129                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 130                         seq_printf(m, "Type %d Percentage:    %d\n",
 131                                    i, info->typepct[i - 1]);
 132                 }
 133         }
 134 }
 135
 136 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 137 {
 138         int i;
 139
 140         seq_putc(m, '\n');
 141         if (!MACHINE_HAS_TOPOLOGY)
 142                 return;
 143         if (stsi(info, 15, 1, topology_max_mnest))
 144                 return;
 145         seq_printf(m, "CPU Topology HW:     ");
 146         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 147                 seq_printf(m, " %d", info->mag[i]);
 148         seq_putc(m, '\n');
 149 #ifdef CONFIG_SCHED_TOPOLOGY
 150         store_topology(info);
 151         seq_printf(m, "CPU Topology SW:     ");
 152         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 153                 seq_printf(m, " %d", info->mag[i]);
 154         seq_putc(m, '\n');
 155 #endif
 156 }
 157
 158 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 159 {
 160         struct sysinfo_1_2_2_extension *ext;
 161         int i;
 162
 163         if (stsi(info, 1, 2, 2))
 164                 return;
 165         ext = (struct sysinfo_1_2_2_extension *)
 166                 ((unsigned long) info + info->acc_offset);
 167         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 168         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 169         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 170         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 171         if (info->mt_installed) {
 172                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 173                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 174         }
 175         /*
 176          * Sigh 2. According to the specification the alternate
 177          * capability field is a 32 bit floating point number
 178          * if the higher order 8 bits are not zero. Printing
 179          * a floating point number in the kernel is a no-no,
 180          * always print the number as 32 bit unsigned integer.
 181          * The user-space needs to know about the strange
 182          * encoding of the alternate cpu capability.
 183          */
 184         seq_printf(m, "Capability:           %u", info->capability);
 185         if (info->format == 1)
 186                 seq_printf(m, " %u", ext->alt_capability);
 187         seq_putc(m, '\n');
 188         if (info->nominal_cap)
 189                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 190         if (info->secondary_cap)
 191                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 192         for (i = 2; i <= info->cpus_total; i++) {
 193                 seq_printf(m, "Adjustment %02d-way:    %u",
 194                            i, info->adjustment[i-2]);
 195                 if (info->format == 1)
 196                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 197                 seq_putc(m, '\n');
 198         }
 199 }
 200
 201 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 202 {
 203         if (stsi(info, 2, 2, 2))
 204                 return;
 205         EBCASC(info->name, sizeof(info->name));
 206         seq_putc(m, '\n');
 207         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 208         seq_printf(m, "LPAR Characteristics: ");
 209         if (info->characteristics & LPAR_CHAR_DEDICATED)
 210                 seq_printf(m, "Dedicated ");
 211         if (info->characteristics & LPAR_CHAR_SHARED)
 212                 seq_printf(m, "Shared ");
 213         if (info->characteristics & LPAR_CHAR_LIMITED)
 214                 seq_printf(m, "Limited ");
 215         seq_putc(m, '\n');
 216         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 217         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 218         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 219         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 220         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 221         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 222         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 223         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 224         if (info->mt_installed) {
 225                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 226                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 227                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 228         }
 229         if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 230                 seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 231                 seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 232         }
 233 }
 234
 235 static void print_ext_name(struct seq_file *m, int lvl,
 236                            struct sysinfo_3_2_2 *info)
 237 {
 238         size_t len = sizeof(info->ext_names[lvl]);
 239
 240         if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 241                 return;
 242         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 243                    info->ext_names[lvl]);
 244 }
 245
 246 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 247 {
 248         if (uuid_is_null(&info->vm[i].uuid))
 249                 return;
 250         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 251 }
 252
 253 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 254 {
 255         int i;
 256
 257         if (stsi(info, 3, 2, 2))
 258                 return;
 259         for (i = 0; i < info->count; i++) {
 260                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 261                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 262                 seq_putc(m, '\n');
 263                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 264                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 265                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 266                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 267                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 268                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 269                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 270                 print_ext_name(m, i, info);
 271                 print_uuid(m, i, info);
 272         }
 273 }
 274
 275 static int sysinfo_show(struct seq_file *m, void *v)
 276 {
 277         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 278         int level;
 279
 280         if (!info)
 281                 return 0;
 282         level = stsi(NULL, 0, 0, 0);
 283         if (level >= 1)
 284                 stsi_1_1_1(m, info);
 285         if (level >= 1)
 286                 stsi_15_1_x(m, info);
 287         if (level >= 1)
 288                 stsi_1_2_2(m, info);
 289         if (level >= 2)
 290                 stsi_2_2_2(m, info);
 291         if (level >= 3)
 292                 stsi_3_2_2(m, info);
 293         free_page((unsigned long)info);
 294         return 0;
 295 }
 296
 297 static int sysinfo_open(struct inode *inode, struct file *file)
 298 {
 299         return single_open(file, sysinfo_show, NULL);
 300 }
 301
 302 static const struct file_operations sysinfo_fops = {
 303         .open           = sysinfo_open,
 304         .read           = seq_read,
 305         .llseek         = seq_lseek,
 306         .release        = single_release,
 307 };
 308
 309 static int __init sysinfo_create_proc(void)
 310 {
 311         proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
 312         return 0;
 313 }
 314 device_initcall(sysinfo_create_proc);
 315
 316 #endif /* CONFIG_PROC_FS */
 317
 318 /*
 319  * Service levels interface.
 320  */
 321
 322 static DECLARE_RWSEM(service_level_sem);
 323 static LIST_HEAD(service_level_list);
 324
 325 int register_service_level(struct service_level *slr)
 326 {
 327         struct service_level *ptr;
 328
 329         down_write(&service_level_sem);
 330         list_for_each_entry(ptr, &service_level_list, list)
 331                 if (ptr == slr) {
 332                         up_write(&service_level_sem);
 333                         return -EEXIST;
 334                 }
 335         list_add_tail(&slr->list, &service_level_list);
 336         up_write(&service_level_sem);
 337         return 0;
 338 }
 339 EXPORT_SYMBOL(register_service_level);
 340
 341 int unregister_service_level(struct service_level *slr)
 342 {
 343         struct service_level *ptr, *next;
 344         int rc = -ENOENT;
 345
 346         down_write(&service_level_sem);
 347         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 348                 if (ptr != slr)
 349                         continue;
 350                 list_del(&ptr->list);
 351                 rc = 0;
 352                 break;
 353         }
 354         up_write(&service_level_sem);
 355         return rc;
 356 }
 357 EXPORT_SYMBOL(unregister_service_level);
 358
 359 static void *service_level_start(struct seq_file *m, loff_t *pos)
 360 {
 361         down_read(&service_level_sem);
 362         return seq_list_start(&service_level_list, *pos);
 363 }
 364
 365 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 366 {
 367         return seq_list_next(p, &service_level_list, pos);
 368 }
 369
 370 static void service_level_stop(struct seq_file *m, void *p)
 371 {
 372         up_read(&service_level_sem);
 373 }
 374
 375 static int service_level_show(struct seq_file *m, void *p)
 376 {
 377         struct service_level *slr;
 378
 379         slr = list_entry(p, struct service_level, list);
 380         slr->seq_print(m, slr);
 381         return 0;
 382 }
 383
 384 static const struct seq_operations service_level_seq_ops = {
 385         .start          = service_level_start,
 386         .next           = service_level_next,
 387         .stop           = service_level_stop,
 388         .show           = service_level_show
 389 };
 390
 391 static int service_level_open(struct inode *inode, struct file *file)
 392 {
 393         return seq_open(file, &service_level_seq_ops);
 394 }
 395
 396 static const struct file_operations service_level_ops = {
 397         .open           = service_level_open,
 398         .read           = seq_read,
 399         .llseek         = seq_lseek,
 400         .release        = seq_release
 401 };
 402
 403 static void service_level_vm_print(struct seq_file *m,
 404                                    struct service_level *slr)
 405 {
 406         char *query_buffer, *str;
 407
 408         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 409         if (!query_buffer)
 410                 return;
 411         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 412         str = strchr(query_buffer, '\n');
 413         if (str)
 414                 *str = 0;
 415         seq_printf(m, "VM: %s\n", query_buffer);
 416         kfree(query_buffer);
 417 }
 418
 419 static struct service_level service_level_vm = {
 420         .seq_print = service_level_vm_print
 421 };
 422
 423 static __init int create_proc_service_level(void)
 424 {
 425         proc_create("service_levels", 0, NULL, &service_level_ops);
 426         if (MACHINE_IS_VM)
 427                 register_service_level(&service_level_vm);
 428         return 0;
 429 }
 430 subsys_initcall(create_proc_service_level);
 431
 432 /*
 433  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 434  */
 435 void s390_adjust_jiffies(void)
 436 {
 437         struct sysinfo_1_2_2 *info;
 438         unsigned long capability;
 439         struct kernel_fpu fpu;
 440
 441         info = (void *) get_zeroed_page(GFP_KERNEL);
 442         if (!info)
 443                 return;
 444
 445         if (stsi(info, 1, 2, 2) == 0) {
 446                 /*
 447                  * Major sigh. The cpu capability encoding is "special".
 448                  * If the first 9 bits of info->capability are 0 then it
 449                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 450                  * If the first 9 bits are != 0 then it is a 32 bit float.
 451                  * In addition a lower value indicates a proportionally
 452                  * higher cpu capacity. Bogomips are the other way round.
 453                  * To get to a halfway suitable number we divide 1e7
 454                  * by the cpu capability number. Yes, that means a floating
 455                  * point division ..
 456                  */
 457                 kernel_fpu_begin(&fpu, KERNEL_FPR);
 458                 asm volatile(
 459                         "       sfpc    %3\n"
 460                         "       l       %0,%1\n"
 461                         "       tmlh    %0,0xff80\n"
 462                         "       jnz     0f\n"
 463                         "       cefbr   %%f2,%0\n"
 464                         "       j       1f\n"
 465                         "0:     le      %%f2,%1\n"
 466                         "1:     cefbr   %%f0,%2\n"
 467                         "       debr    %%f0,%%f2\n"
 468                         "       cgebr   %0,5,%%f0\n"
 469                         : "=&d" (capability)
 470                         : "Q" (info->capability), "d" (10000000), "d" (0)
 471                         : "cc"
 472                         );
 473                 kernel_fpu_end(&fpu, KERNEL_FPR);
 474         } else
 475                 /*
 476                  * Really old machine without stsi block for basic
 477                  * cpu information. Report 42.0 bogomips.
 478                  */
 479                 capability = 42;
 480         loops_per_jiffy = capability * (500000/HZ);
 481         free_page((unsigned long) info);
 482 }
 483
 484 /*
 485  * calibrate the delay loop
 486  */
 487 void calibrate_delay(void)
 488 {
 489         s390_adjust_jiffies();
 490         /* Print the good old Bogomips line .. */
 491         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 492                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 493                (loops_per_jiffy/(5000/HZ)) % 100);
 494 }
 495
 496 #ifdef CONFIG_DEBUG_FS
 497
 498 #define STSI_FILE(fc, s1, s2)                                                  \
 499 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
 500 {                                                                              \
 501         file->private_data = (void *) get_zeroed_page(GFP_KERNEL);             \
 502         if (!file->private_data)                                               \
 503                 return -ENOMEM;                                                \
 504         if (stsi(file->private_data, fc, s1, s2)) {                            \
 505                 free_page((unsigned long)file->private_data);                  \
 506                 file->private_data = NULL;                                     \
 507                 return -EACCES;                                                \
 508         }                                                                      \
 509         return nonseekable_open(inode, file);                                  \
 510 }                                                                              \
 511                                                                                \
 512 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
 513         .open           = stsi_open_##fc##_##s1##_##s2,                        \
 514         .release        = stsi_release,                                        \
 515         .read           = stsi_read,                                           \
 516         .llseek         = no_llseek,                                           \
 517 };
 518
 519 static int stsi_release(struct inode *inode, struct file *file)
 520 {
 521         free_page((unsigned long)file->private_data);
 522         return 0;
 523 }
 524
 525 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 526 {
 527         return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
 528 }
 529
 530 STSI_FILE( 1, 1, 1);
 531 STSI_FILE( 1, 2, 1);
 532 STSI_FILE( 1, 2, 2);
 533 STSI_FILE( 2, 2, 1);
 534 STSI_FILE( 2, 2, 2);
 535 STSI_FILE( 3, 2, 2);
 536 STSI_FILE(15, 1, 2);
 537 STSI_FILE(15, 1, 3);
 538 STSI_FILE(15, 1, 4);
 539 STSI_FILE(15, 1, 5);
 540 STSI_FILE(15, 1, 6);
 541
 542 struct stsi_file {
 543         const struct file_operations *fops;
 544         char *name;
 545 };
 546
 547 static struct stsi_file stsi_file[] __initdata = {
 548         {.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
 549         {.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
 550         {.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
 551         {.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
 552         {.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
 553         {.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
 554         {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
 555         {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
 556         {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
 557         {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
 558         {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
 559 };
 560
 561 static u8 stsi_0_0_0;
 562
 563 static __init int stsi_init_debugfs(void)
 564 {
 565         struct dentry *stsi_root;
 566         struct stsi_file *sf;
 567         int lvl, i;
 568
 569         stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
 570         if (IS_ERR_OR_NULL(stsi_root))
 571                 return 0;
 572         lvl = stsi(NULL, 0, 0, 0);
 573         if (lvl > 0)
 574                 stsi_0_0_0 = lvl;
 575         debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
 576         for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
 577                 sf = &stsi_file[i];
 578                 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
 579         }
 580         if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
 581                 char link_to[10];
 582
 583                 sprintf(link_to, "15_1_%d", topology_mnest_limit());
 584                 debugfs_create_symlink("topology", stsi_root, link_to);
 585         }
 586         return 0;
 587 }
 588 device_initcall(stsi_init_debugfs);
 589
 590 #endif /* CONFIG_DEBUG_FS */