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 */ 567