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 static bool convert_ext_name(unsigned char encoding, char *name, size_t len) 63 { 64 switch (encoding) { 65 case 1: /* EBCDIC */ 66 EBCASC(name, len); 67 break; 68 case 2: /* UTF-8 */ 69 break; 70 default: 71 return false; 72 } 73 return true; 74 } 75 76 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info) 77 { 78 int i; 79 80 if (stsi(info, 1, 1, 1)) 81 return; 82 EBCASC(info->manufacturer, sizeof(info->manufacturer)); 83 EBCASC(info->type, sizeof(info->type)); 84 EBCASC(info->model, sizeof(info->model)); 85 EBCASC(info->sequence, sizeof(info->sequence)); 86 EBCASC(info->plant, sizeof(info->plant)); 87 EBCASC(info->model_capacity, sizeof(info->model_capacity)); 88 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap)); 89 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap)); 90 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer); 91 seq_printf(m, "Type: %-4.4s\n", info->type); 92 if (info->lic) 93 seq_printf(m, "LIC Identifier: %016lx\n", info->lic); 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 /* 317 * Service levels interface. 318 */ 319 320 static DECLARE_RWSEM(service_level_sem); 321 static LIST_HEAD(service_level_list); 322 323 int register_service_level(struct service_level *slr) 324 { 325 struct service_level *ptr; 326 327 down_write(&service_level_sem); 328 list_for_each_entry(ptr, &service_level_list, list) 329 if (ptr == slr) { 330 up_write(&service_level_sem); 331 return -EEXIST; 332 } 333 list_add_tail(&slr->list, &service_level_list); 334 up_write(&service_level_sem); 335 return 0; 336 } 337 EXPORT_SYMBOL(register_service_level); 338 339 int unregister_service_level(struct service_level *slr) 340 { 341 struct service_level *ptr, *next; 342 int rc = -ENOENT; 343 344 down_write(&service_level_sem); 345 list_for_each_entry_safe(ptr, next, &service_level_list, list) { 346 if (ptr != slr) 347 continue; 348 list_del(&ptr->list); 349 rc = 0; 350 break; 351 } 352 up_write(&service_level_sem); 353 return rc; 354 } 355 EXPORT_SYMBOL(unregister_service_level); 356 357 static void *service_level_start(struct seq_file *m, loff_t *pos) 358 { 359 down_read(&service_level_sem); 360 return seq_list_start(&service_level_list, *pos); 361 } 362 363 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 364 { 365 return seq_list_next(p, &service_level_list, pos); 366 } 367 368 static void service_level_stop(struct seq_file *m, void *p) 369 { 370 up_read(&service_level_sem); 371 } 372 373 static int service_level_show(struct seq_file *m, void *p) 374 { 375 struct service_level *slr; 376 377 slr = list_entry(p, struct service_level, list); 378 slr->seq_print(m, slr); 379 return 0; 380 } 381 382 static const struct seq_operations service_level_seq_ops = { 383 .start = service_level_start, 384 .next = service_level_next, 385 .stop = service_level_stop, 386 .show = service_level_show 387 }; 388 389 static int service_level_open(struct inode *inode, struct file *file) 390 { 391 return seq_open(file, &service_level_seq_ops); 392 } 393 394 static const struct file_operations service_level_ops = { 395 .open = service_level_open, 396 .read = seq_read, 397 .llseek = seq_lseek, 398 .release = seq_release 399 }; 400 401 static void service_level_vm_print(struct seq_file *m, 402 struct service_level *slr) 403 { 404 char *query_buffer, *str; 405 406 query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA); 407 if (!query_buffer) 408 return; 409 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 410 str = strchr(query_buffer, '\n'); 411 if (str) 412 *str = 0; 413 seq_printf(m, "VM: %s\n", query_buffer); 414 kfree(query_buffer); 415 } 416 417 static struct service_level service_level_vm = { 418 .seq_print = service_level_vm_print 419 }; 420 421 static __init int create_proc_service_level(void) 422 { 423 proc_create("service_levels", 0, NULL, &service_level_ops); 424 if (MACHINE_IS_VM) 425 register_service_level(&service_level_vm); 426 return 0; 427 } 428 subsys_initcall(create_proc_service_level); 429 430 /* 431 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 432 */ 433 void s390_adjust_jiffies(void) 434 { 435 struct sysinfo_1_2_2 *info; 436 unsigned long capability; 437 struct kernel_fpu fpu; 438 439 info = (void *) get_zeroed_page(GFP_KERNEL); 440 if (!info) 441 return; 442 443 if (stsi(info, 1, 2, 2) == 0) { 444 /* 445 * Major sigh. The cpu capability encoding is "special". 446 * If the first 9 bits of info->capability are 0 then it 447 * is a 32 bit unsigned integer in the range 0 .. 2^23. 448 * If the first 9 bits are != 0 then it is a 32 bit float. 449 * In addition a lower value indicates a proportionally 450 * higher cpu capacity. Bogomips are the other way round. 451 * To get to a halfway suitable number we divide 1e7 452 * by the cpu capability number. Yes, that means a floating 453 * point division .. 454 */ 455 kernel_fpu_begin(&fpu, KERNEL_FPR); 456 asm volatile( 457 " sfpc %3\n" 458 " l %0,%1\n" 459 " tmlh %0,0xff80\n" 460 " jnz 0f\n" 461 " cefbr %%f2,%0\n" 462 " j 1f\n" 463 "0: le %%f2,%1\n" 464 "1: cefbr %%f0,%2\n" 465 " debr %%f0,%%f2\n" 466 " cgebr %0,5,%%f0\n" 467 : "=&d" (capability) 468 : "Q" (info->capability), "d" (10000000), "d" (0) 469 : "cc" 470 ); 471 kernel_fpu_end(&fpu, KERNEL_FPR); 472 } else 473 /* 474 * Really old machine without stsi block for basic 475 * cpu information. Report 42.0 bogomips. 476 */ 477 capability = 42; 478 loops_per_jiffy = capability * (500000/HZ); 479 free_page((unsigned long) info); 480 } 481 482 /* 483 * calibrate the delay loop 484 */ 485 void calibrate_delay(void) 486 { 487 s390_adjust_jiffies(); 488 /* Print the good old Bogomips line .. */ 489 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 490 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 491 (loops_per_jiffy/(5000/HZ)) % 100); 492 } 493 494 #ifdef CONFIG_DEBUG_FS 495 496 #define STSI_FILE(fc, s1, s2) \ 497 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 498 { \ 499 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 500 if (!file->private_data) \ 501 return -ENOMEM; \ 502 if (stsi(file->private_data, fc, s1, s2)) { \ 503 free_page((unsigned long)file->private_data); \ 504 file->private_data = NULL; \ 505 return -EACCES; \ 506 } \ 507 return nonseekable_open(inode, file); \ 508 } \ 509 \ 510 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 511 .open = stsi_open_##fc##_##s1##_##s2, \ 512 .release = stsi_release, \ 513 .read = stsi_read, \ 514 .llseek = no_llseek, \ 515 }; 516 517 static int stsi_release(struct inode *inode, struct file *file) 518 { 519 free_page((unsigned long)file->private_data); 520 return 0; 521 } 522 523 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 524 { 525 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 526 } 527 528 STSI_FILE( 1, 1, 1); 529 STSI_FILE( 1, 2, 1); 530 STSI_FILE( 1, 2, 2); 531 STSI_FILE( 2, 2, 1); 532 STSI_FILE( 2, 2, 2); 533 STSI_FILE( 3, 2, 2); 534 STSI_FILE(15, 1, 2); 535 STSI_FILE(15, 1, 3); 536 STSI_FILE(15, 1, 4); 537 STSI_FILE(15, 1, 5); 538 STSI_FILE(15, 1, 6); 539 540 struct stsi_file { 541 const struct file_operations *fops; 542 char *name; 543 }; 544 545 static struct stsi_file stsi_file[] __initdata = { 546 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"}, 547 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"}, 548 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"}, 549 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"}, 550 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"}, 551 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"}, 552 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 553 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 554 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 555 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 556 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 557 }; 558 559 static u8 stsi_0_0_0; 560 561 static __init int stsi_init_debugfs(void) 562 { 563 struct dentry *stsi_root; 564 struct stsi_file *sf; 565 int lvl, i; 566 567 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 568 if (IS_ERR_OR_NULL(stsi_root)) 569 return 0; 570 lvl = stsi(NULL, 0, 0, 0); 571 if (lvl > 0) 572 stsi_0_0_0 = lvl; 573 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0); 574 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 575 sf = &stsi_file[i]; 576 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 577 } 578 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) { 579 char link_to[10]; 580 581 sprintf(link_to, "15_1_%d", topology_mnest_limit()); 582 debugfs_create_symlink("topology", stsi_root, link_to); 583 } 584 return 0; 585 } 586 device_initcall(stsi_init_debugfs); 587 588 #endif /* CONFIG_DEBUG_FS */ 589