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/api.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 int i; 85 86 if (stsi(info, 1, 1, 1)) 87 return; 88 EBCASC(info->manufacturer, sizeof(info->manufacturer)); 89 EBCASC(info->type, sizeof(info->type)); 90 EBCASC(info->model, sizeof(info->model)); 91 EBCASC(info->sequence, sizeof(info->sequence)); 92 EBCASC(info->plant, sizeof(info->plant)); 93 EBCASC(info->model_capacity, sizeof(info->model_capacity)); 94 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap)); 95 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap)); 96 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer); 97 seq_printf(m, "Type: %-4.4s\n", info->type); 98 if (info->lic) 99 seq_printf(m, "LIC Identifier: %016lx\n", info->lic); 100 /* 101 * Sigh: the model field has been renamed with System z9 102 * to model_capacity and a new model field has been added 103 * after the plant field. To avoid confusing older programs 104 * the "Model:" prints "model_capacity model" or just 105 * "model_capacity" if the model string is empty . 106 */ 107 seq_printf(m, "Model: %-16.16s", info->model_capacity); 108 if (info->model[0] != '\0') 109 seq_printf(m, " %-16.16s", info->model); 110 seq_putc(m, '\n'); 111 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence); 112 seq_printf(m, "Plant: %-4.4s\n", info->plant); 113 seq_printf(m, "Model Capacity: %-16.16s %08u\n", 114 info->model_capacity, info->model_cap_rating); 115 if (info->model_perm_cap_rating) 116 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n", 117 info->model_perm_cap, 118 info->model_perm_cap_rating); 119 if (info->model_temp_cap_rating) 120 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n", 121 info->model_temp_cap, 122 info->model_temp_cap_rating); 123 if (info->ncr) 124 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr); 125 if (info->npr) 126 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr); 127 if (info->ntr) 128 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr); 129 if (info->cai) { 130 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai); 131 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr); 132 seq_printf(m, "Capacity Transient: %d\n", info->t); 133 } 134 if (info->p) { 135 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) { 136 seq_printf(m, "Type %d Percentage: %d\n", 137 i, info->typepct[i - 1]); 138 } 139 } 140 } 141 142 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info) 143 { 144 int i; 145 146 seq_putc(m, '\n'); 147 if (!MACHINE_HAS_TOPOLOGY) 148 return; 149 if (stsi(info, 15, 1, topology_max_mnest)) 150 return; 151 seq_printf(m, "CPU Topology HW: "); 152 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 153 seq_printf(m, " %d", info->mag[i]); 154 seq_putc(m, '\n'); 155 #ifdef CONFIG_SCHED_TOPOLOGY 156 store_topology(info); 157 seq_printf(m, "CPU Topology SW: "); 158 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 159 seq_printf(m, " %d", info->mag[i]); 160 seq_putc(m, '\n'); 161 #endif 162 } 163 164 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info) 165 { 166 struct sysinfo_1_2_2_extension *ext; 167 int i; 168 169 if (stsi(info, 1, 2, 2)) 170 return; 171 ext = (struct sysinfo_1_2_2_extension *) 172 ((unsigned long) info + info->acc_offset); 173 seq_printf(m, "CPUs Total: %d\n", info->cpus_total); 174 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured); 175 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby); 176 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved); 177 if (info->mt_installed) { 178 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid); 179 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid); 180 } 181 /* 182 * Sigh 2. According to the specification the alternate 183 * capability field is a 32 bit floating point number 184 * if the higher order 8 bits are not zero. Printing 185 * a floating point number in the kernel is a no-no, 186 * always print the number as 32 bit unsigned integer. 187 * The user-space needs to know about the strange 188 * encoding of the alternate cpu capability. 189 */ 190 seq_printf(m, "Capability: %u", info->capability); 191 if (info->format == 1) 192 seq_printf(m, " %u", ext->alt_capability); 193 seq_putc(m, '\n'); 194 if (info->nominal_cap) 195 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap); 196 if (info->secondary_cap) 197 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap); 198 for (i = 2; i <= info->cpus_total; i++) { 199 seq_printf(m, "Adjustment %02d-way: %u", 200 i, info->adjustment[i-2]); 201 if (info->format == 1) 202 seq_printf(m, " %u", ext->alt_adjustment[i-2]); 203 seq_putc(m, '\n'); 204 } 205 } 206 207 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info) 208 { 209 if (stsi(info, 2, 2, 2)) 210 return; 211 EBCASC(info->name, sizeof(info->name)); 212 seq_putc(m, '\n'); 213 seq_printf(m, "LPAR Number: %d\n", info->lpar_number); 214 seq_printf(m, "LPAR Characteristics: "); 215 if (info->characteristics & LPAR_CHAR_DEDICATED) 216 seq_printf(m, "Dedicated "); 217 if (info->characteristics & LPAR_CHAR_SHARED) 218 seq_printf(m, "Shared "); 219 if (info->characteristics & LPAR_CHAR_LIMITED) 220 seq_printf(m, "Limited "); 221 seq_putc(m, '\n'); 222 seq_printf(m, "LPAR Name: %-8.8s\n", info->name); 223 seq_printf(m, "LPAR Adjustment: %d\n", info->caf); 224 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total); 225 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured); 226 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby); 227 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved); 228 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated); 229 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared); 230 if (info->mt_installed) { 231 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid); 232 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid); 233 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid); 234 } 235 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) { 236 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name); 237 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid); 238 } 239 } 240 241 static void print_ext_name(struct seq_file *m, int lvl, 242 struct sysinfo_3_2_2 *info) 243 { 244 size_t len = sizeof(info->ext_names[lvl]); 245 246 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len)) 247 return; 248 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl, 249 info->ext_names[lvl]); 250 } 251 252 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info) 253 { 254 if (uuid_is_null(&info->vm[i].uuid)) 255 return; 256 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid); 257 } 258 259 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info) 260 { 261 int i; 262 263 if (stsi(info, 3, 2, 2)) 264 return; 265 for (i = 0; i < info->count; i++) { 266 EBCASC(info->vm[i].name, sizeof(info->vm[i].name)); 267 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi)); 268 seq_putc(m, '\n'); 269 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name); 270 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi); 271 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf); 272 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total); 273 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured); 274 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby); 275 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved); 276 print_ext_name(m, i, info); 277 print_uuid(m, i, info); 278 } 279 } 280 281 static int sysinfo_show(struct seq_file *m, void *v) 282 { 283 void *info = (void *)get_zeroed_page(GFP_KERNEL); 284 int level; 285 286 if (!info) 287 return 0; 288 level = stsi(NULL, 0, 0, 0); 289 if (level >= 1) 290 stsi_1_1_1(m, info); 291 if (level >= 1) 292 stsi_15_1_x(m, info); 293 if (level >= 1) 294 stsi_1_2_2(m, info); 295 if (level >= 2) 296 stsi_2_2_2(m, info); 297 if (level >= 3) 298 stsi_3_2_2(m, info); 299 free_page((unsigned long)info); 300 return 0; 301 } 302 303 static int __init sysinfo_create_proc(void) 304 { 305 proc_create_single("sysinfo", 0444, NULL, sysinfo_show); 306 return 0; 307 } 308 device_initcall(sysinfo_create_proc); 309 310 #endif /* CONFIG_PROC_FS */ 311 312 /* 313 * Service levels interface. 314 */ 315 316 static DECLARE_RWSEM(service_level_sem); 317 static LIST_HEAD(service_level_list); 318 319 int register_service_level(struct service_level *slr) 320 { 321 struct service_level *ptr; 322 323 down_write(&service_level_sem); 324 list_for_each_entry(ptr, &service_level_list, list) 325 if (ptr == slr) { 326 up_write(&service_level_sem); 327 return -EEXIST; 328 } 329 list_add_tail(&slr->list, &service_level_list); 330 up_write(&service_level_sem); 331 return 0; 332 } 333 EXPORT_SYMBOL(register_service_level); 334 335 int unregister_service_level(struct service_level *slr) 336 { 337 struct service_level *ptr, *next; 338 int rc = -ENOENT; 339 340 down_write(&service_level_sem); 341 list_for_each_entry_safe(ptr, next, &service_level_list, list) { 342 if (ptr != slr) 343 continue; 344 list_del(&ptr->list); 345 rc = 0; 346 break; 347 } 348 up_write(&service_level_sem); 349 return rc; 350 } 351 EXPORT_SYMBOL(unregister_service_level); 352 353 static void *service_level_start(struct seq_file *m, loff_t *pos) 354 { 355 down_read(&service_level_sem); 356 return seq_list_start(&service_level_list, *pos); 357 } 358 359 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 360 { 361 return seq_list_next(p, &service_level_list, pos); 362 } 363 364 static void service_level_stop(struct seq_file *m, void *p) 365 { 366 up_read(&service_level_sem); 367 } 368 369 static int service_level_show(struct seq_file *m, void *p) 370 { 371 struct service_level *slr; 372 373 slr = list_entry(p, struct service_level, list); 374 slr->seq_print(m, slr); 375 return 0; 376 } 377 378 static const struct seq_operations service_level_seq_ops = { 379 .start = service_level_start, 380 .next = service_level_next, 381 .stop = service_level_stop, 382 .show = service_level_show 383 }; 384 385 static void service_level_vm_print(struct seq_file *m, 386 struct service_level *slr) 387 { 388 char *query_buffer, *str; 389 390 query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA); 391 if (!query_buffer) 392 return; 393 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 394 str = strchr(query_buffer, '\n'); 395 if (str) 396 *str = 0; 397 seq_printf(m, "VM: %s\n", query_buffer); 398 kfree(query_buffer); 399 } 400 401 static struct service_level service_level_vm = { 402 .seq_print = service_level_vm_print 403 }; 404 405 static __init int create_proc_service_level(void) 406 { 407 proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops); 408 if (MACHINE_IS_VM) 409 register_service_level(&service_level_vm); 410 return 0; 411 } 412 subsys_initcall(create_proc_service_level); 413 414 /* 415 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 416 */ 417 void s390_adjust_jiffies(void) 418 { 419 struct sysinfo_1_2_2 *info; 420 unsigned long capability; 421 struct kernel_fpu fpu; 422 423 info = (void *) get_zeroed_page(GFP_KERNEL); 424 if (!info) 425 return; 426 427 if (stsi(info, 1, 2, 2) == 0) { 428 /* 429 * Major sigh. The cpu capability encoding is "special". 430 * If the first 9 bits of info->capability are 0 then it 431 * is a 32 bit unsigned integer in the range 0 .. 2^23. 432 * If the first 9 bits are != 0 then it is a 32 bit float. 433 * In addition a lower value indicates a proportionally 434 * higher cpu capacity. Bogomips are the other way round. 435 * To get to a halfway suitable number we divide 1e7 436 * by the cpu capability number. Yes, that means a floating 437 * point division .. 438 */ 439 kernel_fpu_begin(&fpu, KERNEL_FPR); 440 asm volatile( 441 " sfpc %3\n" 442 " l %0,%1\n" 443 " tmlh %0,0xff80\n" 444 " jnz 0f\n" 445 " cefbr %%f2,%0\n" 446 " j 1f\n" 447 "0: le %%f2,%1\n" 448 "1: cefbr %%f0,%2\n" 449 " debr %%f0,%%f2\n" 450 " cgebr %0,5,%%f0\n" 451 : "=&d" (capability) 452 : "Q" (info->capability), "d" (10000000), "d" (0) 453 : "cc" 454 ); 455 kernel_fpu_end(&fpu, KERNEL_FPR); 456 } else 457 /* 458 * Really old machine without stsi block for basic 459 * cpu information. Report 42.0 bogomips. 460 */ 461 capability = 42; 462 loops_per_jiffy = capability * (500000/HZ); 463 free_page((unsigned long) info); 464 } 465 466 /* 467 * calibrate the delay loop 468 */ 469 void calibrate_delay(void) 470 { 471 s390_adjust_jiffies(); 472 /* Print the good old Bogomips line .. */ 473 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 474 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 475 (loops_per_jiffy/(5000/HZ)) % 100); 476 } 477 478 #ifdef CONFIG_DEBUG_FS 479 480 #define STSI_FILE(fc, s1, s2) \ 481 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 482 { \ 483 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 484 if (!file->private_data) \ 485 return -ENOMEM; \ 486 if (stsi(file->private_data, fc, s1, s2)) { \ 487 free_page((unsigned long)file->private_data); \ 488 file->private_data = NULL; \ 489 return -EACCES; \ 490 } \ 491 return nonseekable_open(inode, file); \ 492 } \ 493 \ 494 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 495 .open = stsi_open_##fc##_##s1##_##s2, \ 496 .release = stsi_release, \ 497 .read = stsi_read, \ 498 .llseek = no_llseek, \ 499 }; 500 501 static int stsi_release(struct inode *inode, struct file *file) 502 { 503 free_page((unsigned long)file->private_data); 504 return 0; 505 } 506 507 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 508 { 509 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 510 } 511 512 STSI_FILE( 1, 1, 1); 513 STSI_FILE( 1, 2, 1); 514 STSI_FILE( 1, 2, 2); 515 STSI_FILE( 2, 2, 1); 516 STSI_FILE( 2, 2, 2); 517 STSI_FILE( 3, 2, 2); 518 STSI_FILE(15, 1, 2); 519 STSI_FILE(15, 1, 3); 520 STSI_FILE(15, 1, 4); 521 STSI_FILE(15, 1, 5); 522 STSI_FILE(15, 1, 6); 523 524 struct stsi_file { 525 const struct file_operations *fops; 526 char *name; 527 }; 528 529 static struct stsi_file stsi_file[] __initdata = { 530 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"}, 531 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"}, 532 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"}, 533 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"}, 534 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"}, 535 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"}, 536 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 537 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 538 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 539 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 540 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 541 }; 542 543 static u8 stsi_0_0_0; 544 545 static __init int stsi_init_debugfs(void) 546 { 547 struct dentry *stsi_root; 548 struct stsi_file *sf; 549 int lvl, i; 550 551 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 552 lvl = stsi(NULL, 0, 0, 0); 553 if (lvl > 0) 554 stsi_0_0_0 = lvl; 555 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0); 556 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 557 sf = &stsi_file[i]; 558 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 559 } 560 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) { 561 char link_to[10]; 562 563 sprintf(link_to, "15_1_%d", topology_mnest_limit()); 564 debugfs_create_symlink("topology", stsi_root, link_to); 565 } 566 return 0; 567 } 568 device_initcall(stsi_init_debugfs); 569 570 #endif /* CONFIG_DEBUG_FS */ 571