1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2001, 2009 4 * Author(s): Ulrich Weigand <[email protected]>, 5 * Martin Schwidefsky <[email protected]>, 6 */ 7 8 #include <linux/cpufeature.h> 9 #include <linux/debugfs.h> 10 #include <linux/kernel.h> 11 #include <linux/mm.h> 12 #include <linux/proc_fs.h> 13 #include <linux/seq_file.h> 14 #include <linux/init.h> 15 #include <linux/delay.h> 16 #include <linux/export.h> 17 #include <linux/slab.h> 18 #include <asm/asm-extable.h> 19 #include <asm/ebcdic.h> 20 #include <asm/debug.h> 21 #include <asm/sysinfo.h> 22 #include <asm/cpcmd.h> 23 #include <asm/topology.h> 24 #include <asm/fpu.h> 25 #include <asm/asm.h> 26 27 int topology_max_mnest; 28 29 /* 30 * stsi - store system information 31 * 32 * Returns the current configuration level if function code 0 was specified. 33 * Otherwise returns 0 on success or a negative value on error. 34 */ 35 int stsi(void *sysinfo, int fc, int sel1, int sel2) 36 { 37 int r0 = (fc << 28) | sel1; 38 int cc; 39 40 asm volatile( 41 " lr %%r0,%[r0]\n" 42 " lr %%r1,%[r1]\n" 43 " stsi %[sysinfo]\n" 44 " lr %[r0],%%r0\n" 45 CC_IPM(cc) 46 : CC_OUT(cc, cc), [r0] "+d" (r0), [sysinfo] "=Q" (*(char *)sysinfo) 47 : [r1] "d" (sel2) 48 : CC_CLOBBER_LIST("0", "1", "memory")); 49 if (cc == 3) 50 return -EOPNOTSUPP; 51 return fc ? 0 : (unsigned int)r0 >> 28; 52 } 53 EXPORT_SYMBOL(stsi); 54 55 #ifdef CONFIG_PROC_FS 56 57 static bool convert_ext_name(unsigned char encoding, char *name, size_t len) 58 { 59 switch (encoding) { 60 case 1: /* EBCDIC */ 61 EBCASC(name, len); 62 break; 63 case 2: /* UTF-8 */ 64 break; 65 default: 66 return false; 67 } 68 return true; 69 } 70 71 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info) 72 { 73 bool has_var_cap; 74 int i; 75 76 if (stsi(info, 1, 1, 1)) 77 return; 78 has_var_cap = !!info->model_var_cap[0]; 79 EBCASC(info->manufacturer, sizeof(info->manufacturer)); 80 EBCASC(info->type, sizeof(info->type)); 81 EBCASC(info->model, sizeof(info->model)); 82 EBCASC(info->sequence, sizeof(info->sequence)); 83 EBCASC(info->plant, sizeof(info->plant)); 84 EBCASC(info->model_capacity, sizeof(info->model_capacity)); 85 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap)); 86 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap)); 87 if (has_var_cap) 88 EBCASC(info->model_var_cap, sizeof(info->model_var_cap)); 89 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer); 90 seq_printf(m, "Type: %-4.4s\n", info->type); 91 if (info->lic) 92 seq_printf(m, "LIC Identifier: %016lx\n", info->lic); 93 /* 94 * Sigh: the model field has been renamed with System z9 95 * to model_capacity and a new model field has been added 96 * after the plant field. To avoid confusing older programs 97 * the "Model:" prints "model_capacity model" or just 98 * "model_capacity" if the model string is empty . 99 */ 100 seq_printf(m, "Model: %-16.16s", info->model_capacity); 101 if (info->model[0] != '\0') 102 seq_printf(m, " %-16.16s", info->model); 103 seq_putc(m, '\n'); 104 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence); 105 seq_printf(m, "Plant: %-4.4s\n", info->plant); 106 seq_printf(m, "Model Capacity: %-16.16s %08u\n", 107 info->model_capacity, info->model_cap_rating); 108 if (info->model_perm_cap_rating) 109 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n", 110 info->model_perm_cap, 111 info->model_perm_cap_rating); 112 if (info->model_temp_cap_rating) 113 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n", 114 info->model_temp_cap, 115 info->model_temp_cap_rating); 116 if (has_var_cap && info->model_var_cap_rating) 117 seq_printf(m, "Model Var. Capacity: %-16.16s %08u\n", 118 info->model_var_cap, 119 info->model_var_cap_rating); 120 if (info->ncr) 121 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr); 122 if (info->npr) 123 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr); 124 if (info->ntr) 125 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr); 126 if (has_var_cap && info->nvr) 127 seq_printf(m, "Nominal Var. Rating: %08u\n", info->nvr); 128 if (info->cai) { 129 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai); 130 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr); 131 seq_printf(m, "Capacity Transient: %d\n", info->t); 132 } 133 if (info->p) { 134 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) { 135 seq_printf(m, "Type %d Percentage: %d\n", 136 i, info->typepct[i - 1]); 137 } 138 } 139 } 140 141 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info) 142 { 143 int i; 144 145 seq_putc(m, '\n'); 146 if (!cpu_has_topology()) 147 return; 148 if (stsi(info, 15, 1, topology_max_mnest)) 149 return; 150 seq_printf(m, "CPU Topology HW: "); 151 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 152 seq_printf(m, " %d", info->mag[i]); 153 seq_putc(m, '\n'); 154 #ifdef CONFIG_SCHED_TOPOLOGY 155 store_topology(info); 156 seq_printf(m, "CPU Topology SW: "); 157 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 158 seq_printf(m, " %d", info->mag[i]); 159 seq_putc(m, '\n'); 160 #endif 161 } 162 163 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info) 164 { 165 struct sysinfo_1_2_2_extension *ext; 166 int i; 167 168 if (stsi(info, 1, 2, 2)) 169 return; 170 ext = (struct sysinfo_1_2_2_extension *) 171 ((unsigned long) info + info->acc_offset); 172 seq_printf(m, "CPUs Total: %d\n", info->cpus_total); 173 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured); 174 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby); 175 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved); 176 if (info->mt_installed) { 177 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid); 178 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid); 179 } 180 /* 181 * Sigh 2. According to the specification the alternate 182 * capability field is a 32 bit floating point number 183 * if the higher order 8 bits are not zero. Printing 184 * a floating point number in the kernel is a no-no, 185 * always print the number as 32 bit unsigned integer. 186 * The user-space needs to know about the strange 187 * encoding of the alternate cpu capability. 188 */ 189 seq_printf(m, "Capability: %u", info->capability); 190 if (info->format == 1) 191 seq_printf(m, " %u", ext->alt_capability); 192 seq_putc(m, '\n'); 193 if (info->nominal_cap) 194 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap); 195 if (info->secondary_cap) 196 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap); 197 for (i = 2; i <= info->cpus_total; i++) { 198 seq_printf(m, "Adjustment %02d-way: %u", 199 i, info->adjustment[i-2]); 200 if (info->format == 1) 201 seq_printf(m, " %u", ext->alt_adjustment[i-2]); 202 seq_putc(m, '\n'); 203 } 204 } 205 206 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info) 207 { 208 if (stsi(info, 2, 2, 2)) 209 return; 210 EBCASC(info->name, sizeof(info->name)); 211 seq_putc(m, '\n'); 212 seq_printf(m, "LPAR Number: %d\n", info->lpar_number); 213 seq_printf(m, "LPAR Characteristics: "); 214 if (info->characteristics & LPAR_CHAR_DEDICATED) 215 seq_printf(m, "Dedicated "); 216 if (info->characteristics & LPAR_CHAR_SHARED) 217 seq_printf(m, "Shared "); 218 if (info->characteristics & LPAR_CHAR_LIMITED) 219 seq_printf(m, "Limited "); 220 seq_putc(m, '\n'); 221 seq_printf(m, "LPAR Name: %-8.8s\n", info->name); 222 seq_printf(m, "LPAR Adjustment: %d\n", info->caf); 223 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total); 224 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured); 225 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby); 226 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved); 227 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated); 228 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared); 229 if (info->mt_installed) { 230 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid); 231 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid); 232 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid); 233 } 234 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) { 235 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name); 236 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid); 237 } 238 } 239 240 static void print_ext_name(struct seq_file *m, int lvl, 241 struct sysinfo_3_2_2 *info) 242 { 243 size_t len = sizeof(info->ext_names[lvl]); 244 245 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len)) 246 return; 247 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl, 248 info->ext_names[lvl]); 249 } 250 251 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info) 252 { 253 if (uuid_is_null(&info->vm[i].uuid)) 254 return; 255 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid); 256 } 257 258 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info) 259 { 260 int i; 261 262 if (stsi(info, 3, 2, 2)) 263 return; 264 for (i = 0; i < info->count; i++) { 265 EBCASC(info->vm[i].name, sizeof(info->vm[i].name)); 266 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi)); 267 seq_putc(m, '\n'); 268 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name); 269 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi); 270 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf); 271 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total); 272 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured); 273 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby); 274 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved); 275 print_ext_name(m, i, info); 276 print_uuid(m, i, info); 277 } 278 } 279 280 static int sysinfo_show(struct seq_file *m, void *v) 281 { 282 void *info = (void *)get_zeroed_page(GFP_KERNEL); 283 int level; 284 285 if (!info) 286 return 0; 287 level = stsi(NULL, 0, 0, 0); 288 if (level >= 1) 289 stsi_1_1_1(m, info); 290 if (level >= 1) 291 stsi_15_1_x(m, info); 292 if (level >= 1) 293 stsi_1_2_2(m, info); 294 if (level >= 2) 295 stsi_2_2_2(m, info); 296 if (level >= 3) 297 stsi_3_2_2(m, info); 298 free_page((unsigned long)info); 299 return 0; 300 } 301 302 static int __init sysinfo_create_proc(void) 303 { 304 proc_create_single("sysinfo", 0444, NULL, sysinfo_show); 305 return 0; 306 } 307 device_initcall(sysinfo_create_proc); 308 309 #endif /* CONFIG_PROC_FS */ 310 311 /* 312 * Service levels interface. 313 */ 314 315 static DECLARE_RWSEM(service_level_sem); 316 static LIST_HEAD(service_level_list); 317 318 int register_service_level(struct service_level *slr) 319 { 320 struct service_level *ptr; 321 322 down_write(&service_level_sem); 323 list_for_each_entry(ptr, &service_level_list, list) 324 if (ptr == slr) { 325 up_write(&service_level_sem); 326 return -EEXIST; 327 } 328 list_add_tail(&slr->list, &service_level_list); 329 up_write(&service_level_sem); 330 return 0; 331 } 332 EXPORT_SYMBOL(register_service_level); 333 334 int unregister_service_level(struct service_level *slr) 335 { 336 struct service_level *ptr, *next; 337 int rc = -ENOENT; 338 339 down_write(&service_level_sem); 340 list_for_each_entry_safe(ptr, next, &service_level_list, list) { 341 if (ptr != slr) 342 continue; 343 list_del(&ptr->list); 344 rc = 0; 345 break; 346 } 347 up_write(&service_level_sem); 348 return rc; 349 } 350 EXPORT_SYMBOL(unregister_service_level); 351 352 static void *service_level_start(struct seq_file *m, loff_t *pos) 353 { 354 down_read(&service_level_sem); 355 return seq_list_start(&service_level_list, *pos); 356 } 357 358 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 359 { 360 return seq_list_next(p, &service_level_list, pos); 361 } 362 363 static void service_level_stop(struct seq_file *m, void *p) 364 { 365 up_read(&service_level_sem); 366 } 367 368 static int service_level_show(struct seq_file *m, void *p) 369 { 370 struct service_level *slr; 371 372 slr = list_entry(p, struct service_level, list); 373 slr->seq_print(m, slr); 374 return 0; 375 } 376 377 static const struct seq_operations service_level_seq_ops = { 378 .start = service_level_start, 379 .next = service_level_next, 380 .stop = service_level_stop, 381 .show = service_level_show 382 }; 383 384 static void service_level_vm_print(struct seq_file *m, 385 struct service_level *slr) 386 { 387 char *query_buffer, *str; 388 389 query_buffer = kmalloc(1024, GFP_KERNEL); 390 if (!query_buffer) 391 return; 392 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 393 str = strchr(query_buffer, '\n'); 394 if (str) 395 *str = 0; 396 seq_printf(m, "VM: %s\n", query_buffer); 397 kfree(query_buffer); 398 } 399 400 static struct service_level service_level_vm = { 401 .seq_print = service_level_vm_print 402 }; 403 404 static __init int create_proc_service_level(void) 405 { 406 proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops); 407 if (MACHINE_IS_VM) 408 register_service_level(&service_level_vm); 409 return 0; 410 } 411 subsys_initcall(create_proc_service_level); 412 413 /* 414 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 415 */ 416 void s390_adjust_jiffies(void) 417 { 418 DECLARE_KERNEL_FPU_ONSTACK16(fpu); 419 struct sysinfo_1_2_2 *info; 420 unsigned long capability; 421 422 info = (void *) get_zeroed_page(GFP_KERNEL); 423 if (!info) 424 return; 425 426 if (stsi(info, 1, 2, 2) == 0) { 427 /* 428 * Major sigh. The cpu capability encoding is "special". 429 * If the first 9 bits of info->capability are 0 then it 430 * is a 32 bit unsigned integer in the range 0 .. 2^23. 431 * If the first 9 bits are != 0 then it is a 32 bit float. 432 * In addition a lower value indicates a proportionally 433 * higher cpu capacity. Bogomips are the other way round. 434 * To get to a halfway suitable number we divide 1e7 435 * by the cpu capability number. Yes, that means a floating 436 * point division .. 437 */ 438 kernel_fpu_begin(&fpu, KERNEL_FPR); 439 fpu_sfpc(0); 440 if (info->capability & 0xff800000) 441 fpu_ldgr(2, info->capability); 442 else 443 fpu_cefbr(2, info->capability); 444 fpu_cefbr(0, 10000000); 445 fpu_debr(0, 2); 446 capability = fpu_cgebr(0, 5); 447 kernel_fpu_end(&fpu, KERNEL_FPR); 448 } else 449 /* 450 * Really old machine without stsi block for basic 451 * cpu information. Report 42.0 bogomips. 452 */ 453 capability = 42; 454 loops_per_jiffy = capability * (500000/HZ); 455 free_page((unsigned long) info); 456 } 457 458 /* 459 * calibrate the delay loop 460 */ 461 void calibrate_delay(void) 462 { 463 s390_adjust_jiffies(); 464 /* Print the good old Bogomips line .. */ 465 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 466 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 467 (loops_per_jiffy/(5000/HZ)) % 100); 468 } 469 470 #ifdef CONFIG_DEBUG_FS 471 472 #define STSI_FILE(fc, s1, s2) \ 473 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 474 { \ 475 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 476 if (!file->private_data) \ 477 return -ENOMEM; \ 478 if (stsi(file->private_data, fc, s1, s2)) { \ 479 free_page((unsigned long)file->private_data); \ 480 file->private_data = NULL; \ 481 return -EACCES; \ 482 } \ 483 return nonseekable_open(inode, file); \ 484 } \ 485 \ 486 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 487 .open = stsi_open_##fc##_##s1##_##s2, \ 488 .release = stsi_release, \ 489 .read = stsi_read, \ 490 }; 491 492 static int stsi_release(struct inode *inode, struct file *file) 493 { 494 free_page((unsigned long)file->private_data); 495 return 0; 496 } 497 498 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 499 { 500 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 501 } 502 503 STSI_FILE( 1, 1, 1); 504 STSI_FILE( 1, 2, 1); 505 STSI_FILE( 1, 2, 2); 506 STSI_FILE( 2, 2, 1); 507 STSI_FILE( 2, 2, 2); 508 STSI_FILE( 3, 2, 2); 509 STSI_FILE(15, 1, 2); 510 STSI_FILE(15, 1, 3); 511 STSI_FILE(15, 1, 4); 512 STSI_FILE(15, 1, 5); 513 STSI_FILE(15, 1, 6); 514 515 struct stsi_file { 516 const struct file_operations *fops; 517 char *name; 518 }; 519 520 static struct stsi_file stsi_file[] __initdata = { 521 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"}, 522 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"}, 523 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"}, 524 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"}, 525 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"}, 526 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"}, 527 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 528 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 529 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 530 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 531 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 532 }; 533 534 static u8 stsi_0_0_0; 535 536 static __init int stsi_init_debugfs(void) 537 { 538 struct dentry *stsi_root; 539 struct stsi_file *sf; 540 int lvl, i; 541 542 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 543 lvl = stsi(NULL, 0, 0, 0); 544 if (lvl > 0) 545 stsi_0_0_0 = lvl; 546 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0); 547 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 548 sf = &stsi_file[i]; 549 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 550 } 551 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && cpu_has_topology()) { 552 char link_to[10]; 553 554 sprintf(link_to, "15_1_%d", topology_mnest_limit()); 555 debugfs_create_symlink("topology", stsi_root, link_to); 556 } 557 return 0; 558 } 559 device_initcall(stsi_init_debugfs); 560 561 #endif /* CONFIG_DEBUG_FS */ 562