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/asm-extable.h> 18 #include <asm/ebcdic.h> 19 #include <asm/debug.h> 20 #include <asm/sysinfo.h> 21 #include <asm/cpcmd.h> 22 #include <asm/topology.h> 23 #include <asm/fpu.h> 24 25 int topology_max_mnest; 26 27 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl) 28 { 29 int r0 = (fc << 28) | sel1; 30 int rc = 0; 31 32 asm volatile( 33 " lr 0,%[r0]\n" 34 " lr 1,%[r1]\n" 35 " stsi 0(%[sysinfo])\n" 36 "0: jz 2f\n" 37 "1: lhi %[rc],%[retval]\n" 38 "2: lr %[r0],0\n" 39 EX_TABLE(0b, 1b) 40 : [r0] "+d" (r0), [rc] "+d" (rc) 41 : [r1] "d" (sel2), 42 [sysinfo] "a" (sysinfo), 43 [retval] "K" (-EOPNOTSUPP) 44 : "cc", "0", "1", "memory"); 45 *lvl = ((unsigned int) r0) >> 28; 46 return rc; 47 } 48 49 /* 50 * stsi - store system information 51 * 52 * Returns the current configuration level if function code 0 was specified. 53 * Otherwise returns 0 on success or a negative value on error. 54 */ 55 int stsi(void *sysinfo, int fc, int sel1, int sel2) 56 { 57 int lvl, rc; 58 59 rc = __stsi(sysinfo, fc, sel1, sel2, &lvl); 60 if (rc) 61 return rc; 62 return fc ? 0 : lvl; 63 } 64 EXPORT_SYMBOL(stsi); 65 66 #ifdef CONFIG_PROC_FS 67 68 static bool convert_ext_name(unsigned char encoding, char *name, size_t len) 69 { 70 switch (encoding) { 71 case 1: /* EBCDIC */ 72 EBCASC(name, len); 73 break; 74 case 2: /* UTF-8 */ 75 break; 76 default: 77 return false; 78 } 79 return true; 80 } 81 82 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info) 83 { 84 bool has_var_cap; 85 int i; 86 87 if (stsi(info, 1, 1, 1)) 88 return; 89 has_var_cap = !!info->model_var_cap[0]; 90 EBCASC(info->manufacturer, sizeof(info->manufacturer)); 91 EBCASC(info->type, sizeof(info->type)); 92 EBCASC(info->model, sizeof(info->model)); 93 EBCASC(info->sequence, sizeof(info->sequence)); 94 EBCASC(info->plant, sizeof(info->plant)); 95 EBCASC(info->model_capacity, sizeof(info->model_capacity)); 96 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap)); 97 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap)); 98 if (has_var_cap) 99 EBCASC(info->model_var_cap, sizeof(info->model_var_cap)); 100 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer); 101 seq_printf(m, "Type: %-4.4s\n", info->type); 102 if (info->lic) 103 seq_printf(m, "LIC Identifier: %016lx\n", info->lic); 104 /* 105 * Sigh: the model field has been renamed with System z9 106 * to model_capacity and a new model field has been added 107 * after the plant field. To avoid confusing older programs 108 * the "Model:" prints "model_capacity model" or just 109 * "model_capacity" if the model string is empty . 110 */ 111 seq_printf(m, "Model: %-16.16s", info->model_capacity); 112 if (info->model[0] != '\0') 113 seq_printf(m, " %-16.16s", info->model); 114 seq_putc(m, '\n'); 115 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence); 116 seq_printf(m, "Plant: %-4.4s\n", info->plant); 117 seq_printf(m, "Model Capacity: %-16.16s %08u\n", 118 info->model_capacity, info->model_cap_rating); 119 if (info->model_perm_cap_rating) 120 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n", 121 info->model_perm_cap, 122 info->model_perm_cap_rating); 123 if (info->model_temp_cap_rating) 124 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n", 125 info->model_temp_cap, 126 info->model_temp_cap_rating); 127 if (has_var_cap && info->model_var_cap_rating) 128 seq_printf(m, "Model Var. Capacity: %-16.16s %08u\n", 129 info->model_var_cap, 130 info->model_var_cap_rating); 131 if (info->ncr) 132 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr); 133 if (info->npr) 134 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr); 135 if (info->ntr) 136 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr); 137 if (has_var_cap && info->nvr) 138 seq_printf(m, "Nominal Var. Rating: %08u\n", info->nvr); 139 if (info->cai) { 140 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai); 141 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr); 142 seq_printf(m, "Capacity Transient: %d\n", info->t); 143 } 144 if (info->p) { 145 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) { 146 seq_printf(m, "Type %d Percentage: %d\n", 147 i, info->typepct[i - 1]); 148 } 149 } 150 } 151 152 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info) 153 { 154 int i; 155 156 seq_putc(m, '\n'); 157 if (!MACHINE_HAS_TOPOLOGY) 158 return; 159 if (stsi(info, 15, 1, topology_max_mnest)) 160 return; 161 seq_printf(m, "CPU Topology HW: "); 162 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 163 seq_printf(m, " %d", info->mag[i]); 164 seq_putc(m, '\n'); 165 #ifdef CONFIG_SCHED_TOPOLOGY 166 store_topology(info); 167 seq_printf(m, "CPU Topology SW: "); 168 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 169 seq_printf(m, " %d", info->mag[i]); 170 seq_putc(m, '\n'); 171 #endif 172 } 173 174 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info) 175 { 176 struct sysinfo_1_2_2_extension *ext; 177 int i; 178 179 if (stsi(info, 1, 2, 2)) 180 return; 181 ext = (struct sysinfo_1_2_2_extension *) 182 ((unsigned long) info + info->acc_offset); 183 seq_printf(m, "CPUs Total: %d\n", info->cpus_total); 184 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured); 185 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby); 186 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved); 187 if (info->mt_installed) { 188 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid); 189 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid); 190 } 191 /* 192 * Sigh 2. According to the specification the alternate 193 * capability field is a 32 bit floating point number 194 * if the higher order 8 bits are not zero. Printing 195 * a floating point number in the kernel is a no-no, 196 * always print the number as 32 bit unsigned integer. 197 * The user-space needs to know about the strange 198 * encoding of the alternate cpu capability. 199 */ 200 seq_printf(m, "Capability: %u", info->capability); 201 if (info->format == 1) 202 seq_printf(m, " %u", ext->alt_capability); 203 seq_putc(m, '\n'); 204 if (info->nominal_cap) 205 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap); 206 if (info->secondary_cap) 207 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap); 208 for (i = 2; i <= info->cpus_total; i++) { 209 seq_printf(m, "Adjustment %02d-way: %u", 210 i, info->adjustment[i-2]); 211 if (info->format == 1) 212 seq_printf(m, " %u", ext->alt_adjustment[i-2]); 213 seq_putc(m, '\n'); 214 } 215 } 216 217 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info) 218 { 219 if (stsi(info, 2, 2, 2)) 220 return; 221 EBCASC(info->name, sizeof(info->name)); 222 seq_putc(m, '\n'); 223 seq_printf(m, "LPAR Number: %d\n", info->lpar_number); 224 seq_printf(m, "LPAR Characteristics: "); 225 if (info->characteristics & LPAR_CHAR_DEDICATED) 226 seq_printf(m, "Dedicated "); 227 if (info->characteristics & LPAR_CHAR_SHARED) 228 seq_printf(m, "Shared "); 229 if (info->characteristics & LPAR_CHAR_LIMITED) 230 seq_printf(m, "Limited "); 231 seq_putc(m, '\n'); 232 seq_printf(m, "LPAR Name: %-8.8s\n", info->name); 233 seq_printf(m, "LPAR Adjustment: %d\n", info->caf); 234 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total); 235 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured); 236 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby); 237 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved); 238 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated); 239 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared); 240 if (info->mt_installed) { 241 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid); 242 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid); 243 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid); 244 } 245 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) { 246 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name); 247 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid); 248 } 249 } 250 251 static void print_ext_name(struct seq_file *m, int lvl, 252 struct sysinfo_3_2_2 *info) 253 { 254 size_t len = sizeof(info->ext_names[lvl]); 255 256 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len)) 257 return; 258 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl, 259 info->ext_names[lvl]); 260 } 261 262 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info) 263 { 264 if (uuid_is_null(&info->vm[i].uuid)) 265 return; 266 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid); 267 } 268 269 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info) 270 { 271 int i; 272 273 if (stsi(info, 3, 2, 2)) 274 return; 275 for (i = 0; i < info->count; i++) { 276 EBCASC(info->vm[i].name, sizeof(info->vm[i].name)); 277 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi)); 278 seq_putc(m, '\n'); 279 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name); 280 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi); 281 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf); 282 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total); 283 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured); 284 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby); 285 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved); 286 print_ext_name(m, i, info); 287 print_uuid(m, i, info); 288 } 289 } 290 291 static int sysinfo_show(struct seq_file *m, void *v) 292 { 293 void *info = (void *)get_zeroed_page(GFP_KERNEL); 294 int level; 295 296 if (!info) 297 return 0; 298 level = stsi(NULL, 0, 0, 0); 299 if (level >= 1) 300 stsi_1_1_1(m, info); 301 if (level >= 1) 302 stsi_15_1_x(m, info); 303 if (level >= 1) 304 stsi_1_2_2(m, info); 305 if (level >= 2) 306 stsi_2_2_2(m, info); 307 if (level >= 3) 308 stsi_3_2_2(m, info); 309 free_page((unsigned long)info); 310 return 0; 311 } 312 313 static int __init sysinfo_create_proc(void) 314 { 315 proc_create_single("sysinfo", 0444, NULL, sysinfo_show); 316 return 0; 317 } 318 device_initcall(sysinfo_create_proc); 319 320 #endif /* CONFIG_PROC_FS */ 321 322 /* 323 * Service levels interface. 324 */ 325 326 static DECLARE_RWSEM(service_level_sem); 327 static LIST_HEAD(service_level_list); 328 329 int register_service_level(struct service_level *slr) 330 { 331 struct service_level *ptr; 332 333 down_write(&service_level_sem); 334 list_for_each_entry(ptr, &service_level_list, list) 335 if (ptr == slr) { 336 up_write(&service_level_sem); 337 return -EEXIST; 338 } 339 list_add_tail(&slr->list, &service_level_list); 340 up_write(&service_level_sem); 341 return 0; 342 } 343 EXPORT_SYMBOL(register_service_level); 344 345 int unregister_service_level(struct service_level *slr) 346 { 347 struct service_level *ptr, *next; 348 int rc = -ENOENT; 349 350 down_write(&service_level_sem); 351 list_for_each_entry_safe(ptr, next, &service_level_list, list) { 352 if (ptr != slr) 353 continue; 354 list_del(&ptr->list); 355 rc = 0; 356 break; 357 } 358 up_write(&service_level_sem); 359 return rc; 360 } 361 EXPORT_SYMBOL(unregister_service_level); 362 363 static void *service_level_start(struct seq_file *m, loff_t *pos) 364 { 365 down_read(&service_level_sem); 366 return seq_list_start(&service_level_list, *pos); 367 } 368 369 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 370 { 371 return seq_list_next(p, &service_level_list, pos); 372 } 373 374 static void service_level_stop(struct seq_file *m, void *p) 375 { 376 up_read(&service_level_sem); 377 } 378 379 static int service_level_show(struct seq_file *m, void *p) 380 { 381 struct service_level *slr; 382 383 slr = list_entry(p, struct service_level, list); 384 slr->seq_print(m, slr); 385 return 0; 386 } 387 388 static const struct seq_operations service_level_seq_ops = { 389 .start = service_level_start, 390 .next = service_level_next, 391 .stop = service_level_stop, 392 .show = service_level_show 393 }; 394 395 static void service_level_vm_print(struct seq_file *m, 396 struct service_level *slr) 397 { 398 char *query_buffer, *str; 399 400 query_buffer = kmalloc(1024, GFP_KERNEL); 401 if (!query_buffer) 402 return; 403 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 404 str = strchr(query_buffer, '\n'); 405 if (str) 406 *str = 0; 407 seq_printf(m, "VM: %s\n", query_buffer); 408 kfree(query_buffer); 409 } 410 411 static struct service_level service_level_vm = { 412 .seq_print = service_level_vm_print 413 }; 414 415 static __init int create_proc_service_level(void) 416 { 417 proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops); 418 if (MACHINE_IS_VM) 419 register_service_level(&service_level_vm); 420 return 0; 421 } 422 subsys_initcall(create_proc_service_level); 423 424 /* 425 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 426 */ 427 void s390_adjust_jiffies(void) 428 { 429 DECLARE_KERNEL_FPU_ONSTACK16(fpu); 430 struct sysinfo_1_2_2 *info; 431 unsigned long capability; 432 433 info = (void *) get_zeroed_page(GFP_KERNEL); 434 if (!info) 435 return; 436 437 if (stsi(info, 1, 2, 2) == 0) { 438 /* 439 * Major sigh. The cpu capability encoding is "special". 440 * If the first 9 bits of info->capability are 0 then it 441 * is a 32 bit unsigned integer in the range 0 .. 2^23. 442 * If the first 9 bits are != 0 then it is a 32 bit float. 443 * In addition a lower value indicates a proportionally 444 * higher cpu capacity. Bogomips are the other way round. 445 * To get to a halfway suitable number we divide 1e7 446 * by the cpu capability number. Yes, that means a floating 447 * point division .. 448 */ 449 kernel_fpu_begin(&fpu, KERNEL_FPR); 450 fpu_sfpc(0); 451 if (info->capability & 0xff800000) 452 fpu_ldgr(2, info->capability); 453 else 454 fpu_cefbr(2, info->capability); 455 fpu_cefbr(0, 10000000); 456 fpu_debr(0, 2); 457 capability = fpu_cgebr(0, 5); 458 kernel_fpu_end(&fpu, KERNEL_FPR); 459 } else 460 /* 461 * Really old machine without stsi block for basic 462 * cpu information. Report 42.0 bogomips. 463 */ 464 capability = 42; 465 loops_per_jiffy = capability * (500000/HZ); 466 free_page((unsigned long) info); 467 } 468 469 /* 470 * calibrate the delay loop 471 */ 472 void calibrate_delay(void) 473 { 474 s390_adjust_jiffies(); 475 /* Print the good old Bogomips line .. */ 476 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 477 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 478 (loops_per_jiffy/(5000/HZ)) % 100); 479 } 480 481 #ifdef CONFIG_DEBUG_FS 482 483 #define STSI_FILE(fc, s1, s2) \ 484 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 485 { \ 486 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 487 if (!file->private_data) \ 488 return -ENOMEM; \ 489 if (stsi(file->private_data, fc, s1, s2)) { \ 490 free_page((unsigned long)file->private_data); \ 491 file->private_data = NULL; \ 492 return -EACCES; \ 493 } \ 494 return nonseekable_open(inode, file); \ 495 } \ 496 \ 497 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 498 .open = stsi_open_##fc##_##s1##_##s2, \ 499 .release = stsi_release, \ 500 .read = stsi_read, \ 501 }; 502 503 static int stsi_release(struct inode *inode, struct file *file) 504 { 505 free_page((unsigned long)file->private_data); 506 return 0; 507 } 508 509 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 510 { 511 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 512 } 513 514 STSI_FILE( 1, 1, 1); 515 STSI_FILE( 1, 2, 1); 516 STSI_FILE( 1, 2, 2); 517 STSI_FILE( 2, 2, 1); 518 STSI_FILE( 2, 2, 2); 519 STSI_FILE( 3, 2, 2); 520 STSI_FILE(15, 1, 2); 521 STSI_FILE(15, 1, 3); 522 STSI_FILE(15, 1, 4); 523 STSI_FILE(15, 1, 5); 524 STSI_FILE(15, 1, 6); 525 526 struct stsi_file { 527 const struct file_operations *fops; 528 char *name; 529 }; 530 531 static struct stsi_file stsi_file[] __initdata = { 532 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"}, 533 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"}, 534 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"}, 535 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"}, 536 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"}, 537 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"}, 538 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 539 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 540 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 541 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 542 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 543 }; 544 545 static u8 stsi_0_0_0; 546 547 static __init int stsi_init_debugfs(void) 548 { 549 struct dentry *stsi_root; 550 struct stsi_file *sf; 551 int lvl, i; 552 553 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 554 lvl = stsi(NULL, 0, 0, 0); 555 if (lvl > 0) 556 stsi_0_0_0 = lvl; 557 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0); 558 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 559 sf = &stsi_file[i]; 560 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 561 } 562 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) { 563 char link_to[10]; 564 565 sprintf(link_to, "15_1_%d", topology_mnest_limit()); 566 debugfs_create_symlink("topology", stsi_root, link_to); 567 } 568 return 0; 569 } 570 device_initcall(stsi_init_debugfs); 571 572 #endif /* CONFIG_DEBUG_FS */ 573