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