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 /* 93 * Sigh: the model field has been renamed with System z9 94 * to model_capacity and a new model field has been added 95 * after the plant field. To avoid confusing older programs 96 * the "Model:" prints "model_capacity model" or just 97 * "model_capacity" if the model string is empty . 98 */ 99 seq_printf(m, "Model: %-16.16s", info->model_capacity); 100 if (info->model[0] != '\0') 101 seq_printf(m, " %-16.16s", info->model); 102 seq_putc(m, '\n'); 103 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence); 104 seq_printf(m, "Plant: %-4.4s\n", info->plant); 105 seq_printf(m, "Model Capacity: %-16.16s %08u\n", 106 info->model_capacity, info->model_cap_rating); 107 if (info->model_perm_cap_rating) 108 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n", 109 info->model_perm_cap, 110 info->model_perm_cap_rating); 111 if (info->model_temp_cap_rating) 112 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n", 113 info->model_temp_cap, 114 info->model_temp_cap_rating); 115 if (info->ncr) 116 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr); 117 if (info->npr) 118 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr); 119 if (info->ntr) 120 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr); 121 if (info->cai) { 122 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai); 123 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr); 124 seq_printf(m, "Capacity Transient: %d\n", info->t); 125 } 126 if (info->p) { 127 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) { 128 seq_printf(m, "Type %d Percentage: %d\n", 129 i, info->typepct[i - 1]); 130 } 131 } 132 } 133 134 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info) 135 { 136 int i; 137 138 seq_putc(m, '\n'); 139 if (!MACHINE_HAS_TOPOLOGY) 140 return; 141 if (stsi(info, 15, 1, topology_max_mnest)) 142 return; 143 seq_printf(m, "CPU Topology HW: "); 144 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 145 seq_printf(m, " %d", info->mag[i]); 146 seq_putc(m, '\n'); 147 #ifdef CONFIG_SCHED_TOPOLOGY 148 store_topology(info); 149 seq_printf(m, "CPU Topology SW: "); 150 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 151 seq_printf(m, " %d", info->mag[i]); 152 seq_putc(m, '\n'); 153 #endif 154 } 155 156 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info) 157 { 158 struct sysinfo_1_2_2_extension *ext; 159 int i; 160 161 if (stsi(info, 1, 2, 2)) 162 return; 163 ext = (struct sysinfo_1_2_2_extension *) 164 ((unsigned long) info + info->acc_offset); 165 seq_printf(m, "CPUs Total: %d\n", info->cpus_total); 166 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured); 167 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby); 168 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved); 169 if (info->mt_installed) { 170 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid); 171 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid); 172 } 173 /* 174 * Sigh 2. According to the specification the alternate 175 * capability field is a 32 bit floating point number 176 * if the higher order 8 bits are not zero. Printing 177 * a floating point number in the kernel is a no-no, 178 * always print the number as 32 bit unsigned integer. 179 * The user-space needs to know about the strange 180 * encoding of the alternate cpu capability. 181 */ 182 seq_printf(m, "Capability: %u", info->capability); 183 if (info->format == 1) 184 seq_printf(m, " %u", ext->alt_capability); 185 seq_putc(m, '\n'); 186 if (info->nominal_cap) 187 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap); 188 if (info->secondary_cap) 189 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap); 190 for (i = 2; i <= info->cpus_total; i++) { 191 seq_printf(m, "Adjustment %02d-way: %u", 192 i, info->adjustment[i-2]); 193 if (info->format == 1) 194 seq_printf(m, " %u", ext->alt_adjustment[i-2]); 195 seq_putc(m, '\n'); 196 } 197 } 198 199 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info) 200 { 201 if (stsi(info, 2, 2, 2)) 202 return; 203 EBCASC(info->name, sizeof(info->name)); 204 seq_putc(m, '\n'); 205 seq_printf(m, "LPAR Number: %d\n", info->lpar_number); 206 seq_printf(m, "LPAR Characteristics: "); 207 if (info->characteristics & LPAR_CHAR_DEDICATED) 208 seq_printf(m, "Dedicated "); 209 if (info->characteristics & LPAR_CHAR_SHARED) 210 seq_printf(m, "Shared "); 211 if (info->characteristics & LPAR_CHAR_LIMITED) 212 seq_printf(m, "Limited "); 213 seq_putc(m, '\n'); 214 seq_printf(m, "LPAR Name: %-8.8s\n", info->name); 215 seq_printf(m, "LPAR Adjustment: %d\n", info->caf); 216 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total); 217 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured); 218 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby); 219 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved); 220 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated); 221 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared); 222 if (info->mt_installed) { 223 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid); 224 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid); 225 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid); 226 } 227 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) { 228 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name); 229 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid); 230 } 231 } 232 233 static void print_ext_name(struct seq_file *m, int lvl, 234 struct sysinfo_3_2_2 *info) 235 { 236 size_t len = sizeof(info->ext_names[lvl]); 237 238 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len)) 239 return; 240 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl, 241 info->ext_names[lvl]); 242 } 243 244 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info) 245 { 246 if (uuid_is_null(&info->vm[i].uuid)) 247 return; 248 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid); 249 } 250 251 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info) 252 { 253 int i; 254 255 if (stsi(info, 3, 2, 2)) 256 return; 257 for (i = 0; i < info->count; i++) { 258 EBCASC(info->vm[i].name, sizeof(info->vm[i].name)); 259 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi)); 260 seq_putc(m, '\n'); 261 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name); 262 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi); 263 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf); 264 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total); 265 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured); 266 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby); 267 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved); 268 print_ext_name(m, i, info); 269 print_uuid(m, i, info); 270 } 271 } 272 273 static int sysinfo_show(struct seq_file *m, void *v) 274 { 275 void *info = (void *)get_zeroed_page(GFP_KERNEL); 276 int level; 277 278 if (!info) 279 return 0; 280 level = stsi(NULL, 0, 0, 0); 281 if (level >= 1) 282 stsi_1_1_1(m, info); 283 if (level >= 1) 284 stsi_15_1_x(m, info); 285 if (level >= 1) 286 stsi_1_2_2(m, info); 287 if (level >= 2) 288 stsi_2_2_2(m, info); 289 if (level >= 3) 290 stsi_3_2_2(m, info); 291 free_page((unsigned long)info); 292 return 0; 293 } 294 295 static int sysinfo_open(struct inode *inode, struct file *file) 296 { 297 return single_open(file, sysinfo_show, NULL); 298 } 299 300 static const struct file_operations sysinfo_fops = { 301 .open = sysinfo_open, 302 .read = seq_read, 303 .llseek = seq_lseek, 304 .release = single_release, 305 }; 306 307 static int __init sysinfo_create_proc(void) 308 { 309 proc_create("sysinfo", 0444, NULL, &sysinfo_fops); 310 return 0; 311 } 312 device_initcall(sysinfo_create_proc); 313 314 /* 315 * Service levels interface. 316 */ 317 318 static DECLARE_RWSEM(service_level_sem); 319 static LIST_HEAD(service_level_list); 320 321 int register_service_level(struct service_level *slr) 322 { 323 struct service_level *ptr; 324 325 down_write(&service_level_sem); 326 list_for_each_entry(ptr, &service_level_list, list) 327 if (ptr == slr) { 328 up_write(&service_level_sem); 329 return -EEXIST; 330 } 331 list_add_tail(&slr->list, &service_level_list); 332 up_write(&service_level_sem); 333 return 0; 334 } 335 EXPORT_SYMBOL(register_service_level); 336 337 int unregister_service_level(struct service_level *slr) 338 { 339 struct service_level *ptr, *next; 340 int rc = -ENOENT; 341 342 down_write(&service_level_sem); 343 list_for_each_entry_safe(ptr, next, &service_level_list, list) { 344 if (ptr != slr) 345 continue; 346 list_del(&ptr->list); 347 rc = 0; 348 break; 349 } 350 up_write(&service_level_sem); 351 return rc; 352 } 353 EXPORT_SYMBOL(unregister_service_level); 354 355 static void *service_level_start(struct seq_file *m, loff_t *pos) 356 { 357 down_read(&service_level_sem); 358 return seq_list_start(&service_level_list, *pos); 359 } 360 361 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 362 { 363 return seq_list_next(p, &service_level_list, pos); 364 } 365 366 static void service_level_stop(struct seq_file *m, void *p) 367 { 368 up_read(&service_level_sem); 369 } 370 371 static int service_level_show(struct seq_file *m, void *p) 372 { 373 struct service_level *slr; 374 375 slr = list_entry(p, struct service_level, list); 376 slr->seq_print(m, slr); 377 return 0; 378 } 379 380 static const struct seq_operations service_level_seq_ops = { 381 .start = service_level_start, 382 .next = service_level_next, 383 .stop = service_level_stop, 384 .show = service_level_show 385 }; 386 387 static int service_level_open(struct inode *inode, struct file *file) 388 { 389 return seq_open(file, &service_level_seq_ops); 390 } 391 392 static const struct file_operations service_level_ops = { 393 .open = service_level_open, 394 .read = seq_read, 395 .llseek = seq_lseek, 396 .release = seq_release 397 }; 398 399 static void service_level_vm_print(struct seq_file *m, 400 struct service_level *slr) 401 { 402 char *query_buffer, *str; 403 404 query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA); 405 if (!query_buffer) 406 return; 407 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 408 str = strchr(query_buffer, '\n'); 409 if (str) 410 *str = 0; 411 seq_printf(m, "VM: %s\n", query_buffer); 412 kfree(query_buffer); 413 } 414 415 static struct service_level service_level_vm = { 416 .seq_print = service_level_vm_print 417 }; 418 419 static __init int create_proc_service_level(void) 420 { 421 proc_create("service_levels", 0, NULL, &service_level_ops); 422 if (MACHINE_IS_VM) 423 register_service_level(&service_level_vm); 424 return 0; 425 } 426 subsys_initcall(create_proc_service_level); 427 428 /* 429 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 430 */ 431 void s390_adjust_jiffies(void) 432 { 433 struct sysinfo_1_2_2 *info; 434 unsigned long capability; 435 struct kernel_fpu fpu; 436 437 info = (void *) get_zeroed_page(GFP_KERNEL); 438 if (!info) 439 return; 440 441 if (stsi(info, 1, 2, 2) == 0) { 442 /* 443 * Major sigh. The cpu capability encoding is "special". 444 * If the first 9 bits of info->capability are 0 then it 445 * is a 32 bit unsigned integer in the range 0 .. 2^23. 446 * If the first 9 bits are != 0 then it is a 32 bit float. 447 * In addition a lower value indicates a proportionally 448 * higher cpu capacity. Bogomips are the other way round. 449 * To get to a halfway suitable number we divide 1e7 450 * by the cpu capability number. Yes, that means a floating 451 * point division .. 452 */ 453 kernel_fpu_begin(&fpu, KERNEL_FPR); 454 asm volatile( 455 " sfpc %3\n" 456 " l %0,%1\n" 457 " tmlh %0,0xff80\n" 458 " jnz 0f\n" 459 " cefbr %%f2,%0\n" 460 " j 1f\n" 461 "0: le %%f2,%1\n" 462 "1: cefbr %%f0,%2\n" 463 " debr %%f0,%%f2\n" 464 " cgebr %0,5,%%f0\n" 465 : "=&d" (capability) 466 : "Q" (info->capability), "d" (10000000), "d" (0) 467 : "cc" 468 ); 469 kernel_fpu_end(&fpu, KERNEL_FPR); 470 } else 471 /* 472 * Really old machine without stsi block for basic 473 * cpu information. Report 42.0 bogomips. 474 */ 475 capability = 42; 476 loops_per_jiffy = capability * (500000/HZ); 477 free_page((unsigned long) info); 478 } 479 480 /* 481 * calibrate the delay loop 482 */ 483 void calibrate_delay(void) 484 { 485 s390_adjust_jiffies(); 486 /* Print the good old Bogomips line .. */ 487 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 488 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 489 (loops_per_jiffy/(5000/HZ)) % 100); 490 } 491 492 #ifdef CONFIG_DEBUG_FS 493 494 #define STSI_FILE(fc, s1, s2) \ 495 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 496 { \ 497 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 498 if (!file->private_data) \ 499 return -ENOMEM; \ 500 if (stsi(file->private_data, fc, s1, s2)) { \ 501 free_page((unsigned long)file->private_data); \ 502 file->private_data = NULL; \ 503 return -EACCES; \ 504 } \ 505 return nonseekable_open(inode, file); \ 506 } \ 507 \ 508 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 509 .open = stsi_open_##fc##_##s1##_##s2, \ 510 .release = stsi_release, \ 511 .read = stsi_read, \ 512 .llseek = no_llseek, \ 513 }; 514 515 static int stsi_release(struct inode *inode, struct file *file) 516 { 517 free_page((unsigned long)file->private_data); 518 return 0; 519 } 520 521 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 522 { 523 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 524 } 525 526 STSI_FILE( 1, 1, 1); 527 STSI_FILE( 1, 2, 1); 528 STSI_FILE( 1, 2, 2); 529 STSI_FILE( 2, 2, 1); 530 STSI_FILE( 2, 2, 2); 531 STSI_FILE( 3, 2, 2); 532 STSI_FILE(15, 1, 2); 533 STSI_FILE(15, 1, 3); 534 STSI_FILE(15, 1, 4); 535 STSI_FILE(15, 1, 5); 536 STSI_FILE(15, 1, 6); 537 538 struct stsi_file { 539 const struct file_operations *fops; 540 char *name; 541 }; 542 543 static struct stsi_file stsi_file[] __initdata = { 544 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"}, 545 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"}, 546 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"}, 547 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"}, 548 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"}, 549 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"}, 550 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 551 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 552 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 553 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 554 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 555 }; 556 557 static u8 stsi_0_0_0; 558 559 static __init int stsi_init_debugfs(void) 560 { 561 struct dentry *stsi_root; 562 struct stsi_file *sf; 563 int lvl, i; 564 565 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 566 if (IS_ERR_OR_NULL(stsi_root)) 567 return 0; 568 lvl = stsi(NULL, 0, 0, 0); 569 if (lvl > 0) 570 stsi_0_0_0 = lvl; 571 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0); 572 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 573 sf = &stsi_file[i]; 574 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 575 } 576 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) { 577 char link_to[10]; 578 579 sprintf(link_to, "15_1_%d", topology_mnest_limit()); 580 debugfs_create_symlink("topology", stsi_root, link_to); 581 } 582 return 0; 583 } 584 device_initcall(stsi_init_debugfs); 585 586 #endif /* CONFIG_DEBUG_FS */ 587