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sysinfo.c
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linux-6.19.14/arch/s390/kernel/sysinfo.c
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 28int topology_max_mnest; 29 30#ifdef CONFIG_PROC_FS 31 32static 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 46static 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 116static 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 138static 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 181static 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 215static 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 226static 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 233static 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 255static 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 277static int __init sysinfo_create_proc(void) 278{ 279 proc_create_single("sysinfo", 0444, NULL, sysinfo_show); 280 return 0; 281} 282device_initcall(sysinfo_create_proc); 283 284#endif /* CONFIG_PROC_FS */ 285 286/* 287 * Service levels interface. 288 */ 289 290static DECLARE_RWSEM(service_level_sem); 291static LIST_HEAD(service_level_list); 292 293int 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} 307EXPORT_SYMBOL(register_service_level); 308 309int 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} 325EXPORT_SYMBOL(unregister_service_level); 326 327static void *service_level_start(struct seq_file *m, loff_t *pos) 328{ 329 down_read(&service_level_sem); 330 return seq_list_start(&service_level_list, *pos); 331} 332 333static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 334{ 335 return seq_list_next(p, &service_level_list, pos); 336} 337 338static void service_level_stop(struct seq_file *m, void *p) 339{ 340 up_read(&service_level_sem); 341} 342 343static int service_level_show(struct seq_file *m, void *p) 344{ 345 struct service_level *slr; 346 347 slr = list_entry(p, struct service_level, list); 348 slr->seq_print(m, slr); 349 return 0; 350} 351 352static const struct seq_operations service_level_seq_ops = { 353 .start = service_level_start, 354 .next = service_level_next, 355 .stop = service_level_stop, 356 .show = service_level_show 357}; 358 359static void service_level_vm_print(struct seq_file *m, 360 struct service_level *slr) 361{ 362 char *query_buffer, *str; 363 364 query_buffer = kmalloc(1024, GFP_KERNEL); 365 if (!query_buffer) 366 return; 367 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 368 str = strchr(query_buffer, '\n'); 369 if (str) 370 *str = 0; 371 seq_printf(m, "VM: %s\n", query_buffer); 372 kfree(query_buffer); 373} 374 375static struct service_level service_level_vm = { 376 .seq_print = service_level_vm_print 377}; 378 379static __init int create_proc_service_level(void) 380{ 381 proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops); 382 if (machine_is_vm()) 383 register_service_level(&service_level_vm); 384 return 0; 385} 386subsys_initcall(create_proc_service_level); 387 388/* 389 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 390 */ 391void s390_adjust_jiffies(void) 392{ 393 DECLARE_KERNEL_FPU_ONSTACK16(fpu); 394 struct sysinfo_1_2_2 *info; 395 unsigned long capability; 396 397 info = (void *) get_zeroed_page(GFP_KERNEL); 398 if (!info) 399 return; 400 401 if (stsi(info, 1, 2, 2) == 0) { 402 /* 403 * Major sigh. The cpu capability encoding is "special". 404 * If the first 9 bits of info->capability are 0 then it 405 * is a 32 bit unsigned integer in the range 0 .. 2^23. 406 * If the first 9 bits are != 0 then it is a 32 bit float. 407 * In addition a lower value indicates a proportionally 408 * higher cpu capacity. Bogomips are the other way round. 409 * To get to a halfway suitable number we divide 1e7 410 * by the cpu capability number. Yes, that means a floating 411 * point division .. 412 */ 413 kernel_fpu_begin(&fpu, KERNEL_FPR); 414 fpu_sfpc(0); 415 if (info->capability & 0xff800000) 416 fpu_ldgr(2, info->capability); 417 else 418 fpu_cefbr(2, info->capability); 419 fpu_cefbr(0, 10000000); 420 fpu_debr(0, 2); 421 capability = fpu_cgebr(0, 5); 422 kernel_fpu_end(&fpu, KERNEL_FPR); 423 } else 424 /* 425 * Really old machine without stsi block for basic 426 * cpu information. Report 42.0 bogomips. 427 */ 428 capability = 42; 429 loops_per_jiffy = capability * (500000/HZ); 430 free_page((unsigned long) info); 431} 432 433/* 434 * calibrate the delay loop 435 */ 436void calibrate_delay(void) 437{ 438 s390_adjust_jiffies(); 439 /* Print the good old Bogomips line .. */ 440 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 441 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 442 (loops_per_jiffy/(5000/HZ)) % 100); 443} 444 445#ifdef CONFIG_DEBUG_FS 446 447#define STSI_FILE(fc, s1, s2) \ 448static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 449{ \ 450 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 451 if (!file->private_data) \ 452 return -ENOMEM; \ 453 if (stsi(file->private_data, fc, s1, s2)) { \ 454 free_page((unsigned long)file->private_data); \ 455 file->private_data = NULL; \ 456 return -EACCES; \ 457 } \ 458 return nonseekable_open(inode, file); \ 459} \ 460 \ 461static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 462 .open = stsi_open_##fc##_##s1##_##s2, \ 463 .release = stsi_release, \ 464 .read = stsi_read, \ 465}; 466 467static int stsi_release(struct inode *inode, struct file *file) 468{ 469 free_page((unsigned long)file->private_data); 470 return 0; 471} 472 473static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 474{ 475 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 476} 477 478STSI_FILE( 1, 1, 1); 479STSI_FILE( 1, 2, 1); 480STSI_FILE( 1, 2, 2); 481STSI_FILE( 2, 2, 1); 482STSI_FILE( 2, 2, 2); 483STSI_FILE( 3, 2, 2); 484STSI_FILE(15, 1, 2); 485STSI_FILE(15, 1, 3); 486STSI_FILE(15, 1, 4); 487STSI_FILE(15, 1, 5); 488STSI_FILE(15, 1, 6); 489 490struct stsi_file { 491 const struct file_operations *fops; 492 char *name; 493}; 494 495static struct stsi_file stsi_file[] __initdata = { 496 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"}, 497 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"}, 498 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"}, 499 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"}, 500 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"}, 501 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"}, 502 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 503 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 504 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 505 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 506 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 507}; 508 509static u8 stsi_0_0_0; 510 511static __init int stsi_init_debugfs(void) 512{ 513 struct dentry *stsi_root; 514 struct stsi_file *sf; 515 int lvl, i; 516 517 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 518 lvl = stsi(NULL, 0, 0, 0); 519 if (lvl > 0) 520 stsi_0_0_0 = lvl; 521 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0); 522 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 523 sf = &stsi_file[i]; 524 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 525 } 526 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && cpu_has_topology()) { 527 char link_to[10]; 528 529 snprintf(link_to, sizeof(link_to), "15_1_%d", topology_mnest_limit()); 530 debugfs_create_symlink("topology", stsi_root, link_to); 531 } 532 return 0; 533} 534device_initcall(stsi_init_debugfs); 535 536#endif /* CONFIG_DEBUG_FS */
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