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         int r0 = (fc << 28) | sel1;
  29         int rc = 0;
  30
  31         asm volatile(
  32                 "       lr      0,%[r0]\n"
  33                 "       lr      1,%[r1]\n"
  34                 "       stsi    0(%[sysinfo])\n"
  35                 "0:     jz      2f\n"
  36                 "1:     lhi     %[rc],%[retval]\n"
  37                 "2:     lr      %[r0],0\n"
  38                 EX_TABLE(0b, 1b)
  39                 : [r0] "+d" (r0), [rc] "+d" (rc)
  40                 : [r1] "d" (sel2),
  41                   [sysinfo] "a" (sysinfo),
  42                   [retval] "K" (-EOPNOTSUPP)
  43                 : "cc", "0", "1", "memory");
  44         *lvl = ((unsigned int) r0) >> 28;
  45         return rc;
  46 }
  47
  48 /*
  49  * stsi - store system information
  50  *
  51  * Returns the current configuration level if function code 0 was specified.
  52  * Otherwise returns 0 on success or a negative value on error.
  53  */
  54 int stsi(void *sysinfo, int fc, int sel1, int sel2)
  55 {
  56         int lvl, rc;
  57
  58         rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
  59         if (rc)
  60                 return rc;
  61         return fc ? 0 : lvl;
  62 }
  63 EXPORT_SYMBOL(stsi);
  64
  65 #ifdef CONFIG_PROC_FS
  66
  67 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  68 {
  69         switch (encoding) {
  70         case 1: /* EBCDIC */
  71                 EBCASC(name, len);
  72                 break;
  73         case 2: /* UTF-8 */
  74                 break;
  75         default:
  76                 return false;
  77         }
  78         return true;
  79 }
  80
  81 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  82 {
  83         int i;
  84
  85         if (stsi(info, 1, 1, 1))
  86                 return;
  87         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  88         EBCASC(info->type, sizeof(info->type));
  89         EBCASC(info->model, sizeof(info->model));
  90         EBCASC(info->sequence, sizeof(info->sequence));
  91         EBCASC(info->plant, sizeof(info->plant));
  92         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  93         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  94         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  95         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  96         seq_printf(m, "Type:                 %-4.4s\n", info->type);
  97         if (info->lic)
  98                 seq_printf(m, "LIC Identifier:       %016lx\n", info->lic);
  99         /*
 100          * Sigh: the model field has been renamed with System z9
 101          * to model_capacity and a new model field has been added
 102          * after the plant field. To avoid confusing older programs
 103          * the "Model:" prints "model_capacity model" or just
 104          * "model_capacity" if the model string is empty .
 105          */
 106         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
 107         if (info->model[0] != '\0')
 108                 seq_printf(m, " %-16.16s", info->model);
 109         seq_putc(m, '\n');
 110         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 111         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 112         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 113                    info->model_capacity, info->model_cap_rating);
 114         if (info->model_perm_cap_rating)
 115                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 116                            info->model_perm_cap,
 117                            info->model_perm_cap_rating);
 118         if (info->model_temp_cap_rating)
 119                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 120                            info->model_temp_cap,
 121                            info->model_temp_cap_rating);
 122         if (info->ncr)
 123                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 124         if (info->npr)
 125                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 126         if (info->ntr)
 127                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 128         if (info->cai) {
 129                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 130                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 131                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 132         }
 133         if (info->p) {
 134                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 135                         seq_printf(m, "Type %d Percentage:    %d\n",
 136                                    i, info->typepct[i - 1]);
 137                 }
 138         }
 139 }
 140
 141 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 142 {
 143         int i;
 144
 145         seq_putc(m, '\n');
 146         if (!MACHINE_HAS_TOPOLOGY)
 147                 return;
 148         if (stsi(info, 15, 1, topology_max_mnest))
 149                 return;
 150         seq_printf(m, "CPU Topology HW:     ");
 151         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 152                 seq_printf(m, " %d", info->mag[i]);
 153         seq_putc(m, '\n');
 154 #ifdef CONFIG_SCHED_TOPOLOGY
 155         store_topology(info);
 156         seq_printf(m, "CPU Topology SW:     ");
 157         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 158                 seq_printf(m, " %d", info->mag[i]);
 159         seq_putc(m, '\n');
 160 #endif
 161 }
 162
 163 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 164 {
 165         struct sysinfo_1_2_2_extension *ext;
 166         int i;
 167
 168         if (stsi(info, 1, 2, 2))
 169                 return;
 170         ext = (struct sysinfo_1_2_2_extension *)
 171                 ((unsigned long) info + info->acc_offset);
 172         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 173         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 174         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 175         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 176         if (info->mt_installed) {
 177                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 178                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 179         }
 180         /*
 181          * Sigh 2. According to the specification the alternate
 182          * capability field is a 32 bit floating point number
 183          * if the higher order 8 bits are not zero. Printing
 184          * a floating point number in the kernel is a no-no,
 185          * always print the number as 32 bit unsigned integer.
 186          * The user-space needs to know about the strange
 187          * encoding of the alternate cpu capability.
 188          */
 189         seq_printf(m, "Capability:           %u", info->capability);
 190         if (info->format == 1)
 191                 seq_printf(m, " %u", ext->alt_capability);
 192         seq_putc(m, '\n');
 193         if (info->nominal_cap)
 194                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 195         if (info->secondary_cap)
 196                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 197         for (i = 2; i <= info->cpus_total; i++) {
 198                 seq_printf(m, "Adjustment %02d-way:    %u",
 199                            i, info->adjustment[i-2]);
 200                 if (info->format == 1)
 201                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 202                 seq_putc(m, '\n');
 203         }
 204 }
 205
 206 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 207 {
 208         if (stsi(info, 2, 2, 2))
 209                 return;
 210         EBCASC(info->name, sizeof(info->name));
 211         seq_putc(m, '\n');
 212         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 213         seq_printf(m, "LPAR Characteristics: ");
 214         if (info->characteristics & LPAR_CHAR_DEDICATED)
 215                 seq_printf(m, "Dedicated ");
 216         if (info->characteristics & LPAR_CHAR_SHARED)
 217                 seq_printf(m, "Shared ");
 218         if (info->characteristics & LPAR_CHAR_LIMITED)
 219                 seq_printf(m, "Limited ");
 220         seq_putc(m, '\n');
 221         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 222         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 223         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 224         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 225         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 226         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 227         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 228         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 229         if (info->mt_installed) {
 230                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 231                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 232                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 233         }
 234         if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 235                 seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 236                 seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 237         }
 238 }
 239
 240 static void print_ext_name(struct seq_file *m, int lvl,
 241                            struct sysinfo_3_2_2 *info)
 242 {
 243         size_t len = sizeof(info->ext_names[lvl]);
 244
 245         if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 246                 return;
 247         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 248                    info->ext_names[lvl]);
 249 }
 250
 251 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 252 {
 253         if (uuid_is_null(&info->vm[i].uuid))
 254                 return;
 255         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 256 }
 257
 258 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 259 {
 260         int i;
 261
 262         if (stsi(info, 3, 2, 2))
 263                 return;
 264         for (i = 0; i < info->count; i++) {
 265                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 266                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 267                 seq_putc(m, '\n');
 268                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 269                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 270                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 271                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 272                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 273                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 274                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 275                 print_ext_name(m, i, info);
 276                 print_uuid(m, i, info);
 277         }
 278 }
 279
 280 static int sysinfo_show(struct seq_file *m, void *v)
 281 {
 282         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 283         int level;
 284
 285         if (!info)
 286                 return 0;
 287         level = stsi(NULL, 0, 0, 0);
 288         if (level >= 1)
 289                 stsi_1_1_1(m, info);
 290         if (level >= 1)
 291                 stsi_15_1_x(m, info);
 292         if (level >= 1)
 293                 stsi_1_2_2(m, info);
 294         if (level >= 2)
 295                 stsi_2_2_2(m, info);
 296         if (level >= 3)
 297                 stsi_3_2_2(m, info);
 298         free_page((unsigned long)info);
 299         return 0;
 300 }
 301
 302 static int __init sysinfo_create_proc(void)
 303 {
 304         proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
 305         return 0;
 306 }
 307 device_initcall(sysinfo_create_proc);
 308
 309 #endif /* CONFIG_PROC_FS */
 310
 311 /*
 312  * Service levels interface.
 313  */
 314
 315 static DECLARE_RWSEM(service_level_sem);
 316 static LIST_HEAD(service_level_list);
 317
 318 int register_service_level(struct service_level *slr)
 319 {
 320         struct service_level *ptr;
 321
 322         down_write(&service_level_sem);
 323         list_for_each_entry(ptr, &service_level_list, list)
 324                 if (ptr == slr) {
 325                         up_write(&service_level_sem);
 326                         return -EEXIST;
 327                 }
 328         list_add_tail(&slr->list, &service_level_list);
 329         up_write(&service_level_sem);
 330         return 0;
 331 }
 332 EXPORT_SYMBOL(register_service_level);
 333
 334 int unregister_service_level(struct service_level *slr)
 335 {
 336         struct service_level *ptr, *next;
 337         int rc = -ENOENT;
 338
 339         down_write(&service_level_sem);
 340         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 341                 if (ptr != slr)
 342                         continue;
 343                 list_del(&ptr->list);
 344                 rc = 0;
 345                 break;
 346         }
 347         up_write(&service_level_sem);
 348         return rc;
 349 }
 350 EXPORT_SYMBOL(unregister_service_level);
 351
 352 static void *service_level_start(struct seq_file *m, loff_t *pos)
 353 {
 354         down_read(&service_level_sem);
 355         return seq_list_start(&service_level_list, *pos);
 356 }
 357
 358 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 359 {
 360         return seq_list_next(p, &service_level_list, pos);
 361 }
 362
 363 static void service_level_stop(struct seq_file *m, void *p)
 364 {
 365         up_read(&service_level_sem);
 366 }
 367
 368 static int service_level_show(struct seq_file *m, void *p)
 369 {
 370         struct service_level *slr;
 371
 372         slr = list_entry(p, struct service_level, list);
 373         slr->seq_print(m, slr);
 374         return 0;
 375 }
 376
 377 static const struct seq_operations service_level_seq_ops = {
 378         .start          = service_level_start,
 379         .next           = service_level_next,
 380         .stop           = service_level_stop,
 381         .show           = service_level_show
 382 };
 383
 384 static void service_level_vm_print(struct seq_file *m,
 385                                    struct service_level *slr)
 386 {
 387         char *query_buffer, *str;
 388
 389         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 390         if (!query_buffer)
 391                 return;
 392         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 393         str = strchr(query_buffer, '\n');
 394         if (str)
 395                 *str = 0;
 396         seq_printf(m, "VM: %s\n", query_buffer);
 397         kfree(query_buffer);
 398 }
 399
 400 static struct service_level service_level_vm = {
 401         .seq_print = service_level_vm_print
 402 };
 403
 404 static __init int create_proc_service_level(void)
 405 {
 406         proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
 407         if (MACHINE_IS_VM)
 408                 register_service_level(&service_level_vm);
 409         return 0;
 410 }
 411 subsys_initcall(create_proc_service_level);
 412
 413 /*
 414  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 415  */
 416 void s390_adjust_jiffies(void)
 417 {
 418         struct sysinfo_1_2_2 *info;
 419         unsigned long capability;
 420         struct kernel_fpu fpu;
 421
 422         info = (void *) get_zeroed_page(GFP_KERNEL);
 423         if (!info)
 424                 return;
 425
 426         if (stsi(info, 1, 2, 2) == 0) {
 427                 /*
 428                  * Major sigh. The cpu capability encoding is "special".
 429                  * If the first 9 bits of info->capability are 0 then it
 430                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 431                  * If the first 9 bits are != 0 then it is a 32 bit float.
 432                  * In addition a lower value indicates a proportionally
 433                  * higher cpu capacity. Bogomips are the other way round.
 434                  * To get to a halfway suitable number we divide 1e7
 435                  * by the cpu capability number. Yes, that means a floating
 436                  * point division ..
 437                  */
 438                 kernel_fpu_begin(&fpu, KERNEL_FPR);
 439                 asm volatile(
 440                         "       sfpc    %3\n"
 441                         "       l       %0,%1\n"
 442                         "       tmlh    %0,0xff80\n"
 443                         "       jnz     0f\n"
 444                         "       cefbr   %%f2,%0\n"
 445                         "       j       1f\n"
 446                         "0:     le      %%f2,%1\n"
 447                         "1:     cefbr   %%f0,%2\n"
 448                         "       debr    %%f0,%%f2\n"
 449                         "       cgebr   %0,5,%%f0\n"
 450                         : "=&d" (capability)
 451                         : "Q" (info->capability), "d" (10000000), "d" (0)
 452                         : "cc"
 453                         );
 454                 kernel_fpu_end(&fpu, KERNEL_FPR);
 455         } else
 456                 /*
 457                  * Really old machine without stsi block for basic
 458                  * cpu information. Report 42.0 bogomips.
 459                  */
 460                 capability = 42;
 461         loops_per_jiffy = capability * (500000/HZ);
 462         free_page((unsigned long) info);
 463 }
 464
 465 /*
 466  * calibrate the delay loop
 467  */
 468 void calibrate_delay(void)
 469 {
 470         s390_adjust_jiffies();
 471         /* Print the good old Bogomips line .. */
 472         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 473                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 474                (loops_per_jiffy/(5000/HZ)) % 100);
 475 }
 476
 477 #ifdef CONFIG_DEBUG_FS
 478
 479 #define STSI_FILE(fc, s1, s2)                                                  \
 480 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
 481 {                                                                              \
 482         file->private_data = (void *) get_zeroed_page(GFP_KERNEL);             \
 483         if (!file->private_data)                                               \
 484                 return -ENOMEM;                                                \
 485         if (stsi(file->private_data, fc, s1, s2)) {                            \
 486                 free_page((unsigned long)file->private_data);                  \
 487                 file->private_data = NULL;                                     \
 488                 return -EACCES;                                                \
 489         }                                                                      \
 490         return nonseekable_open(inode, file);                                  \
 491 }                                                                              \
 492                                                                                \
 493 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
 494         .open           = stsi_open_##fc##_##s1##_##s2,                        \
 495         .release        = stsi_release,                                        \
 496         .read           = stsi_read,                                           \
 497         .llseek         = no_llseek,                                           \
 498 };
 499
 500 static int stsi_release(struct inode *inode, struct file *file)
 501 {
 502         free_page((unsigned long)file->private_data);
 503         return 0;
 504 }
 505
 506 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 507 {
 508         return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
 509 }
 510
 511 STSI_FILE( 1, 1, 1);
 512 STSI_FILE( 1, 2, 1);
 513 STSI_FILE( 1, 2, 2);
 514 STSI_FILE( 2, 2, 1);
 515 STSI_FILE( 2, 2, 2);
 516 STSI_FILE( 3, 2, 2);
 517 STSI_FILE(15, 1, 2);
 518 STSI_FILE(15, 1, 3);
 519 STSI_FILE(15, 1, 4);
 520 STSI_FILE(15, 1, 5);
 521 STSI_FILE(15, 1, 6);
 522
 523 struct stsi_file {
 524         const struct file_operations *fops;
 525         char *name;
 526 };
 527
 528 static struct stsi_file stsi_file[] __initdata = {
 529         {.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
 530         {.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
 531         {.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
 532         {.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
 533         {.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
 534         {.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
 535         {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
 536         {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
 537         {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
 538         {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
 539         {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
 540 };
 541
 542 static u8 stsi_0_0_0;
 543
 544 static __init int stsi_init_debugfs(void)
 545 {
 546         struct dentry *stsi_root;
 547         struct stsi_file *sf;
 548         int lvl, i;
 549
 550         stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
 551         lvl = stsi(NULL, 0, 0, 0);
 552         if (lvl > 0)
 553                 stsi_0_0_0 = lvl;
 554         debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
 555         for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
 556                 sf = &stsi_file[i];
 557                 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
 558         }
 559         if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
 560                 char link_to[10];
 561
 562                 sprintf(link_to, "15_1_%d", topology_mnest_limit());
 563                 debugfs_create_symlink("topology", stsi_root, link_to);
 564         }
 565         return 0;
 566 }
 567 device_initcall(stsi_init_debugfs);
 568
 569 #endif /* CONFIG_DEBUG_FS */