arch/s390/kernel/sysinfo.c

   1 /*
   2  *  Copyright IBM Corp. 2001, 2009
   3  *  Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
   4  *             Martin Schwidefsky <schwidefsky@de.ibm.com>,
   5  */
   6
   7 #include <linux/debugfs.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/export.h>
  15 #include <linux/slab.h>
  16 #include <asm/ebcdic.h>
  17 #include <asm/debug.h>
  18 #include <asm/sysinfo.h>
  19 #include <asm/cpcmd.h>
  20 #include <asm/topology.h>
  21 #include <asm/fpu/api.h>
  22
  23 int topology_max_mnest;
  24
  25 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
  26 {
  27         register int r0 asm("0") = (fc << 28) | sel1;
  28         register int r1 asm("1") = sel2;
  29         int rc = 0;
  30
  31         asm volatile(
  32                 "       stsi    0(%3)\n"
  33                 "0:     jz      2f\n"
  34                 "1:     lhi     %1,%4\n"
  35                 "2:\n"
  36                 EX_TABLE(0b, 1b)
  37                 : "+d" (r0), "+d" (rc)
  38                 : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
  39                 : "cc", "memory");
  40         *lvl = ((unsigned int) r0) >> 28;
  41         return rc;
  42 }
  43
  44 /*
  45  * stsi - store system information
  46  *
  47  * Returns the current configuration level if function code 0 was specified.
  48  * Otherwise returns 0 on success or a negative value on error.
  49  */
  50 int stsi(void *sysinfo, int fc, int sel1, int sel2)
  51 {
  52         int lvl, rc;
  53
  54         rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
  55         if (rc)
  56                 return rc;
  57         return fc ? 0 : lvl;
  58 }
  59 EXPORT_SYMBOL(stsi);
  60
  61 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  62 {
  63         switch (encoding) {
  64         case 1: /* EBCDIC */
  65                 EBCASC(name, len);
  66                 break;
  67         case 2: /* UTF-8 */
  68                 break;
  69         default:
  70                 return false;
  71         }
  72         return true;
  73 }
  74
  75 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  76 {
  77         int i;
  78
  79         if (stsi(info, 1, 1, 1))
  80                 return;
  81         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  82         EBCASC(info->type, sizeof(info->type));
  83         EBCASC(info->model, sizeof(info->model));
  84         EBCASC(info->sequence, sizeof(info->sequence));
  85         EBCASC(info->plant, sizeof(info->plant));
  86         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  87         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  88         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  89         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  90         seq_printf(m, "Type:                 %-4.4s\n", info->type);
  91         /*
  92          * Sigh: the model field has been renamed with System z9
  93          * to model_capacity and a new model field has been added
  94          * after the plant field. To avoid confusing older programs
  95          * the "Model:" prints "model_capacity model" or just
  96          * "model_capacity" if the model string is empty .
  97          */
  98         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
  99         if (info->model[0] != '\0')
 100                 seq_printf(m, " %-16.16s", info->model);
 101         seq_putc(m, '\n');
 102         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 103         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 104         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 105                    info->model_capacity, info->model_cap_rating);
 106         if (info->model_perm_cap_rating)
 107                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 108                            info->model_perm_cap,
 109                            info->model_perm_cap_rating);
 110         if (info->model_temp_cap_rating)
 111                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 112                            info->model_temp_cap,
 113                            info->model_temp_cap_rating);
 114         if (info->ncr)
 115                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 116         if (info->npr)
 117                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 118         if (info->ntr)
 119                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 120         if (info->cai) {
 121                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 122                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 123                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 124         }
 125         if (info->p) {
 126                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 127                         seq_printf(m, "Type %d Percentage:    %d\n",
 128                                    i, info->typepct[i - 1]);
 129                 }
 130         }
 131 }
 132
 133 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 134 {
 135         int i;
 136
 137         seq_putc(m, '\n');
 138         if (!MACHINE_HAS_TOPOLOGY)
 139                 return;
 140         if (stsi(info, 15, 1, topology_max_mnest))
 141                 return;
 142         seq_printf(m, "CPU Topology HW:     ");
 143         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 144                 seq_printf(m, " %d", info->mag[i]);
 145         seq_putc(m, '\n');
 146 #ifdef CONFIG_SCHED_TOPOLOGY
 147         store_topology(info);
 148         seq_printf(m, "CPU Topology SW:     ");
 149         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 150                 seq_printf(m, " %d", info->mag[i]);
 151         seq_putc(m, '\n');
 152 #endif
 153 }
 154
 155 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 156 {
 157         struct sysinfo_1_2_2_extension *ext;
 158         int i;
 159
 160         if (stsi(info, 1, 2, 2))
 161                 return;
 162         ext = (struct sysinfo_1_2_2_extension *)
 163                 ((unsigned long) info + info->acc_offset);
 164         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 165         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 166         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 167         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 168         if (info->mt_installed) {
 169                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 170                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 171         }
 172         /*
 173          * Sigh 2. According to the specification the alternate
 174          * capability field is a 32 bit floating point number
 175          * if the higher order 8 bits are not zero. Printing
 176          * a floating point number in the kernel is a no-no,
 177          * always print the number as 32 bit unsigned integer.
 178          * The user-space needs to know about the strange
 179          * encoding of the alternate cpu capability.
 180          */
 181         seq_printf(m, "Capability:           %u", info->capability);
 182         if (info->format == 1)
 183                 seq_printf(m, " %u", ext->alt_capability);
 184         seq_putc(m, '\n');
 185         if (info->nominal_cap)
 186                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 187         if (info->secondary_cap)
 188                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 189         for (i = 2; i <= info->cpus_total; i++) {
 190                 seq_printf(m, "Adjustment %02d-way:    %u",
 191                            i, info->adjustment[i-2]);
 192                 if (info->format == 1)
 193                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 194                 seq_putc(m, '\n');
 195         }
 196 }
 197
 198 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 199 {
 200         if (stsi(info, 2, 2, 2))
 201                 return;
 202         EBCASC(info->name, sizeof(info->name));
 203         seq_putc(m, '\n');
 204         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 205         seq_printf(m, "LPAR Characteristics: ");
 206         if (info->characteristics & LPAR_CHAR_DEDICATED)
 207                 seq_printf(m, "Dedicated ");
 208         if (info->characteristics & LPAR_CHAR_SHARED)
 209                 seq_printf(m, "Shared ");
 210         if (info->characteristics & LPAR_CHAR_LIMITED)
 211                 seq_printf(m, "Limited ");
 212         seq_putc(m, '\n');
 213         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 214         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 215         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 216         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 217         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 218         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 219         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 220         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 221         if (info->mt_installed) {
 222                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 223                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 224                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 225         }
 226         if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 227                 seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 228                 seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 229         }
 230 }
 231
 232 static void print_ext_name(struct seq_file *m, int lvl,
 233                            struct sysinfo_3_2_2 *info)
 234 {
 235         size_t len = sizeof(info->ext_names[lvl]);
 236
 237         if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 238                 return;
 239         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 240                    info->ext_names[lvl]);
 241 }
 242
 243 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 244 {
 245         if (uuid_is_null(&info->vm[i].uuid))
 246                 return;
 247         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 248 }
 249
 250 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 251 {
 252         int i;
 253
 254         if (stsi(info, 3, 2, 2))
 255                 return;
 256         for (i = 0; i < info->count; i++) {
 257                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 258                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 259                 seq_putc(m, '\n');
 260                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 261                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 262                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 263                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 264                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 265                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 266                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 267                 print_ext_name(m, i, info);
 268                 print_uuid(m, i, info);
 269         }
 270 }
 271
 272 static int sysinfo_show(struct seq_file *m, void *v)
 273 {
 274         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 275         int level;
 276
 277         if (!info)
 278                 return 0;
 279         level = stsi(NULL, 0, 0, 0);
 280         if (level >= 1)
 281                 stsi_1_1_1(m, info);
 282         if (level >= 1)
 283                 stsi_15_1_x(m, info);
 284         if (level >= 1)
 285                 stsi_1_2_2(m, info);
 286         if (level >= 2)
 287                 stsi_2_2_2(m, info);
 288         if (level >= 3)
 289                 stsi_3_2_2(m, info);
 290         free_page((unsigned long)info);
 291         return 0;
 292 }
 293
 294 static int sysinfo_open(struct inode *inode, struct file *file)
 295 {
 296         return single_open(file, sysinfo_show, NULL);
 297 }
 298
 299 static const struct file_operations sysinfo_fops = {
 300         .open           = sysinfo_open,
 301         .read           = seq_read,
 302         .llseek         = seq_lseek,
 303         .release        = single_release,
 304 };
 305
 306 static int __init sysinfo_create_proc(void)
 307 {
 308         proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
 309         return 0;
 310 }
 311 device_initcall(sysinfo_create_proc);
 312
 313 /*
 314  * Service levels interface.
 315  */
 316
 317 static DECLARE_RWSEM(service_level_sem);
 318 static LIST_HEAD(service_level_list);
 319
 320 int register_service_level(struct service_level *slr)
 321 {
 322         struct service_level *ptr;
 323
 324         down_write(&service_level_sem);
 325         list_for_each_entry(ptr, &service_level_list, list)
 326                 if (ptr == slr) {
 327                         up_write(&service_level_sem);
 328                         return -EEXIST;
 329                 }
 330         list_add_tail(&slr->list, &service_level_list);
 331         up_write(&service_level_sem);
 332         return 0;
 333 }
 334 EXPORT_SYMBOL(register_service_level);
 335
 336 int unregister_service_level(struct service_level *slr)
 337 {
 338         struct service_level *ptr, *next;
 339         int rc = -ENOENT;
 340
 341         down_write(&service_level_sem);
 342         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 343                 if (ptr != slr)
 344                         continue;
 345                 list_del(&ptr->list);
 346                 rc = 0;
 347                 break;
 348         }
 349         up_write(&service_level_sem);
 350         return rc;
 351 }
 352 EXPORT_SYMBOL(unregister_service_level);
 353
 354 static void *service_level_start(struct seq_file *m, loff_t *pos)
 355 {
 356         down_read(&service_level_sem);
 357         return seq_list_start(&service_level_list, *pos);
 358 }
 359
 360 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 361 {
 362         return seq_list_next(p, &service_level_list, pos);
 363 }
 364
 365 static void service_level_stop(struct seq_file *m, void *p)
 366 {
 367         up_read(&service_level_sem);
 368 }
 369
 370 static int service_level_show(struct seq_file *m, void *p)
 371 {
 372         struct service_level *slr;
 373
 374         slr = list_entry(p, struct service_level, list);
 375         slr->seq_print(m, slr);
 376         return 0;
 377 }
 378
 379 static const struct seq_operations service_level_seq_ops = {
 380         .start          = service_level_start,
 381         .next           = service_level_next,
 382         .stop           = service_level_stop,
 383         .show           = service_level_show
 384 };
 385
 386 static int service_level_open(struct inode *inode, struct file *file)
 387 {
 388         return seq_open(file, &service_level_seq_ops);
 389 }
 390
 391 static const struct file_operations service_level_ops = {
 392         .open           = service_level_open,
 393         .read           = seq_read,
 394         .llseek         = seq_lseek,
 395         .release        = seq_release
 396 };
 397
 398 static void service_level_vm_print(struct seq_file *m,
 399                                    struct service_level *slr)
 400 {
 401         char *query_buffer, *str;
 402
 403         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 404         if (!query_buffer)
 405                 return;
 406         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 407         str = strchr(query_buffer, '\n');
 408         if (str)
 409                 *str = 0;
 410         seq_printf(m, "VM: %s\n", query_buffer);
 411         kfree(query_buffer);
 412 }
 413
 414 static struct service_level service_level_vm = {
 415         .seq_print = service_level_vm_print
 416 };
 417
 418 static __init int create_proc_service_level(void)
 419 {
 420         proc_create("service_levels", 0, NULL, &service_level_ops);
 421         if (MACHINE_IS_VM)
 422                 register_service_level(&service_level_vm);
 423         return 0;
 424 }
 425 subsys_initcall(create_proc_service_level);
 426
 427 /*
 428  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 429  */
 430 void s390_adjust_jiffies(void)
 431 {
 432         struct sysinfo_1_2_2 *info;
 433         unsigned long capability;
 434         struct kernel_fpu fpu;
 435
 436         info = (void *) get_zeroed_page(GFP_KERNEL);
 437         if (!info)
 438                 return;
 439
 440         if (stsi(info, 1, 2, 2) == 0) {
 441                 /*
 442                  * Major sigh. The cpu capability encoding is "special".
 443                  * If the first 9 bits of info->capability are 0 then it
 444                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 445                  * If the first 9 bits are != 0 then it is a 32 bit float.
 446                  * In addition a lower value indicates a proportionally
 447                  * higher cpu capacity. Bogomips are the other way round.
 448                  * To get to a halfway suitable number we divide 1e7
 449                  * by the cpu capability number. Yes, that means a floating
 450                  * point division ..
 451                  */
 452                 kernel_fpu_begin(&fpu, KERNEL_FPR);
 453                 asm volatile(
 454                         "       sfpc    %3\n"
 455                         "       l       %0,%1\n"
 456                         "       tmlh    %0,0xff80\n"
 457                         "       jnz     0f\n"
 458                         "       cefbr   %%f2,%0\n"
 459                         "       j       1f\n"
 460                         "0:     le      %%f2,%1\n"
 461                         "1:     cefbr   %%f0,%2\n"
 462                         "       debr    %%f0,%%f2\n"
 463                         "       cgebr   %0,5,%%f0\n"
 464                         : "=&d" (capability)
 465                         : "Q" (info->capability), "d" (10000000), "d" (0)
 466                         : "cc"
 467                         );
 468                 kernel_fpu_end(&fpu, KERNEL_FPR);
 469         } else
 470                 /*
 471                  * Really old machine without stsi block for basic
 472                  * cpu information. Report 42.0 bogomips.
 473                  */
 474                 capability = 42;
 475         loops_per_jiffy = capability * (500000/HZ);
 476         free_page((unsigned long) info);
 477 }
 478
 479 /*
 480  * calibrate the delay loop
 481  */
 482 void calibrate_delay(void)
 483 {
 484         s390_adjust_jiffies();
 485         /* Print the good old Bogomips line .. */
 486         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 487                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 488                (loops_per_jiffy/(5000/HZ)) % 100);
 489 }
 490
 491 #ifdef CONFIG_DEBUG_FS
 492
 493 #define STSI_FILE(fc, s1, s2)                                                  \
 494 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
 495 {                                                                              \
 496         file->private_data = (void *) get_zeroed_page(GFP_KERNEL);             \
 497         if (!file->private_data)                                               \
 498                 return -ENOMEM;                                                \
 499         if (stsi(file->private_data, fc, s1, s2)) {                            \
 500                 free_page((unsigned long)file->private_data);                  \
 501                 file->private_data = NULL;                                     \
 502                 return -EACCES;                                                \
 503         }                                                                      \
 504         return nonseekable_open(inode, file);                                  \
 505 }                                                                              \
 506                                                                                \
 507 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
 508         .open           = stsi_open_##fc##_##s1##_##s2,                        \
 509         .release        = stsi_release,                                        \
 510         .read           = stsi_read,                                           \
 511         .llseek         = no_llseek,                                           \
 512 };
 513
 514 static int stsi_release(struct inode *inode, struct file *file)
 515 {
 516         free_page((unsigned long)file->private_data);
 517         return 0;
 518 }
 519
 520 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 521 {
 522         return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
 523 }
 524
 525 STSI_FILE( 1, 1, 1);
 526 STSI_FILE( 1, 2, 1);
 527 STSI_FILE( 1, 2, 2);
 528 STSI_FILE( 2, 2, 1);
 529 STSI_FILE( 2, 2, 2);
 530 STSI_FILE( 3, 2, 2);
 531 STSI_FILE(15, 1, 2);
 532 STSI_FILE(15, 1, 3);
 533 STSI_FILE(15, 1, 4);
 534 STSI_FILE(15, 1, 5);
 535 STSI_FILE(15, 1, 6);
 536
 537 struct stsi_file {
 538         const struct file_operations *fops;
 539         char *name;
 540 };
 541
 542 static struct stsi_file stsi_file[] __initdata = {
 543         {.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
 544         {.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
 545         {.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
 546         {.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
 547         {.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
 548         {.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
 549         {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
 550         {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
 551         {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
 552         {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
 553         {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
 554 };
 555
 556 static u8 stsi_0_0_0;
 557
 558 static __init int stsi_init_debugfs(void)
 559 {
 560         struct dentry *stsi_root;
 561         struct stsi_file *sf;
 562         int lvl, i;
 563
 564         stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
 565         if (IS_ERR_OR_NULL(stsi_root))
 566                 return 0;
 567         lvl = stsi(NULL, 0, 0, 0);
 568         if (lvl > 0)
 569                 stsi_0_0_0 = lvl;
 570         debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
 571         for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
 572                 sf = &stsi_file[i];
 573                 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
 574         }
 575         if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
 576                 char link_to[10];
 577
 578                 sprintf(link_to, "15_1_%d", topology_mnest_limit());
 579                 debugfs_create_symlink("topology", stsi_root, link_to);
 580         }
 581         return 0;
 582 }
 583 device_initcall(stsi_init_debugfs);
 584
 585 #endif /* CONFIG_DEBUG_FS */