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