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