1 /* 2 * Copyright IBM Corp. 2001, 2009 3 * Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>, 4 * Martin Schwidefsky <schwidefsky@de.ibm.com>, 5 */ 6 7 #include <linux/debugfs.h> 8 #include <linux/kernel.h> 9 #include <linux/mm.h> 10 #include <linux/proc_fs.h> 11 #include <linux/seq_file.h> 12 #include <linux/init.h> 13 #include <linux/delay.h> 14 #include <linux/export.h> 15 #include <linux/slab.h> 16 #include <asm/ebcdic.h> 17 #include <asm/debug.h> 18 #include <asm/sysinfo.h> 19 #include <asm/cpcmd.h> 20 #include <asm/topology.h> 21 #include <asm/fpu/api.h> 22 23 int topology_max_mnest; 24 25 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl) 26 { 27 register int r0 asm("0") = (fc << 28) | sel1; 28 register int r1 asm("1") = sel2; 29 int rc = 0; 30 31 asm volatile( 32 " stsi 0(%3)\n" 33 "0: jz 2f\n" 34 "1: lhi %1,%4\n" 35 "2:\n" 36 EX_TABLE(0b, 1b) 37 : "+d" (r0), "+d" (rc) 38 : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP) 39 : "cc", "memory"); 40 *lvl = ((unsigned int) r0) >> 28; 41 return rc; 42 } 43 44 /* 45 * stsi - store system information 46 * 47 * Returns the current configuration level if function code 0 was specified. 48 * Otherwise returns 0 on success or a negative value on error. 49 */ 50 int stsi(void *sysinfo, int fc, int sel1, int sel2) 51 { 52 int lvl, rc; 53 54 rc = __stsi(sysinfo, fc, sel1, sel2, &lvl); 55 if (rc) 56 return rc; 57 return fc ? 0 : lvl; 58 } 59 EXPORT_SYMBOL(stsi); 60 61 static bool convert_ext_name(unsigned char encoding, char *name, size_t len) 62 { 63 switch (encoding) { 64 case 1: /* EBCDIC */ 65 EBCASC(name, len); 66 break; 67 case 2: /* UTF-8 */ 68 break; 69 default: 70 return false; 71 } 72 return true; 73 } 74 75 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info) 76 { 77 int i; 78 79 if (stsi(info, 1, 1, 1)) 80 return; 81 EBCASC(info->manufacturer, sizeof(info->manufacturer)); 82 EBCASC(info->type, sizeof(info->type)); 83 EBCASC(info->model, sizeof(info->model)); 84 EBCASC(info->sequence, sizeof(info->sequence)); 85 EBCASC(info->plant, sizeof(info->plant)); 86 EBCASC(info->model_capacity, sizeof(info->model_capacity)); 87 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap)); 88 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap)); 89 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer); 90 seq_printf(m, "Type: %-4.4s\n", info->type); 91 /* 92 * Sigh: the model field has been renamed with System z9 93 * to model_capacity and a new model field has been added 94 * after the plant field. To avoid confusing older programs 95 * the "Model:" prints "model_capacity model" or just 96 * "model_capacity" if the model string is empty . 97 */ 98 seq_printf(m, "Model: %-16.16s", info->model_capacity); 99 if (info->model[0] != '\0') 100 seq_printf(m, " %-16.16s", info->model); 101 seq_putc(m, '\n'); 102 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence); 103 seq_printf(m, "Plant: %-4.4s\n", info->plant); 104 seq_printf(m, "Model Capacity: %-16.16s %08u\n", 105 info->model_capacity, info->model_cap_rating); 106 if (info->model_perm_cap_rating) 107 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n", 108 info->model_perm_cap, 109 info->model_perm_cap_rating); 110 if (info->model_temp_cap_rating) 111 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n", 112 info->model_temp_cap, 113 info->model_temp_cap_rating); 114 if (info->ncr) 115 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr); 116 if (info->npr) 117 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr); 118 if (info->ntr) 119 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr); 120 if (info->cai) { 121 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai); 122 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr); 123 seq_printf(m, "Capacity Transient: %d\n", info->t); 124 } 125 if (info->p) { 126 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) { 127 seq_printf(m, "Type %d Percentage: %d\n", 128 i, info->typepct[i - 1]); 129 } 130 } 131 } 132 133 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info) 134 { 135 int i; 136 137 seq_putc(m, '\n'); 138 if (!MACHINE_HAS_TOPOLOGY) 139 return; 140 if (stsi(info, 15, 1, topology_max_mnest)) 141 return; 142 seq_printf(m, "CPU Topology HW: "); 143 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 144 seq_printf(m, " %d", info->mag[i]); 145 seq_putc(m, '\n'); 146 #ifdef CONFIG_SCHED_TOPOLOGY 147 store_topology(info); 148 seq_printf(m, "CPU Topology SW: "); 149 for (i = 0; i < TOPOLOGY_NR_MAG; i++) 150 seq_printf(m, " %d", info->mag[i]); 151 seq_putc(m, '\n'); 152 #endif 153 } 154 155 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info) 156 { 157 struct sysinfo_1_2_2_extension *ext; 158 int i; 159 160 if (stsi(info, 1, 2, 2)) 161 return; 162 ext = (struct sysinfo_1_2_2_extension *) 163 ((unsigned long) info + info->acc_offset); 164 seq_printf(m, "CPUs Total: %d\n", info->cpus_total); 165 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured); 166 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby); 167 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved); 168 if (info->mt_installed) { 169 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid); 170 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid); 171 } 172 /* 173 * Sigh 2. According to the specification the alternate 174 * capability field is a 32 bit floating point number 175 * if the higher order 8 bits are not zero. Printing 176 * a floating point number in the kernel is a no-no, 177 * always print the number as 32 bit unsigned integer. 178 * The user-space needs to know about the strange 179 * encoding of the alternate cpu capability. 180 */ 181 seq_printf(m, "Capability: %u", info->capability); 182 if (info->format == 1) 183 seq_printf(m, " %u", ext->alt_capability); 184 seq_putc(m, '\n'); 185 if (info->nominal_cap) 186 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap); 187 if (info->secondary_cap) 188 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap); 189 for (i = 2; i <= info->cpus_total; i++) { 190 seq_printf(m, "Adjustment %02d-way: %u", 191 i, info->adjustment[i-2]); 192 if (info->format == 1) 193 seq_printf(m, " %u", ext->alt_adjustment[i-2]); 194 seq_putc(m, '\n'); 195 } 196 } 197 198 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info) 199 { 200 if (stsi(info, 2, 2, 2)) 201 return; 202 EBCASC(info->name, sizeof(info->name)); 203 seq_putc(m, '\n'); 204 seq_printf(m, "LPAR Number: %d\n", info->lpar_number); 205 seq_printf(m, "LPAR Characteristics: "); 206 if (info->characteristics & LPAR_CHAR_DEDICATED) 207 seq_printf(m, "Dedicated "); 208 if (info->characteristics & LPAR_CHAR_SHARED) 209 seq_printf(m, "Shared "); 210 if (info->characteristics & LPAR_CHAR_LIMITED) 211 seq_printf(m, "Limited "); 212 seq_putc(m, '\n'); 213 seq_printf(m, "LPAR Name: %-8.8s\n", info->name); 214 seq_printf(m, "LPAR Adjustment: %d\n", info->caf); 215 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total); 216 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured); 217 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby); 218 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved); 219 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated); 220 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared); 221 if (info->mt_installed) { 222 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid); 223 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid); 224 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid); 225 } 226 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) { 227 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name); 228 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid); 229 } 230 } 231 232 static void print_ext_name(struct seq_file *m, int lvl, 233 struct sysinfo_3_2_2 *info) 234 { 235 size_t len = sizeof(info->ext_names[lvl]); 236 237 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len)) 238 return; 239 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl, 240 info->ext_names[lvl]); 241 } 242 243 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info) 244 { 245 if (!memcmp(&info->vm[i].uuid, &NULL_UUID_BE, sizeof(uuid_be))) 246 return; 247 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid); 248 } 249 250 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info) 251 { 252 int i; 253 254 if (stsi(info, 3, 2, 2)) 255 return; 256 for (i = 0; i < info->count; i++) { 257 EBCASC(info->vm[i].name, sizeof(info->vm[i].name)); 258 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi)); 259 seq_putc(m, '\n'); 260 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name); 261 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi); 262 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf); 263 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total); 264 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured); 265 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby); 266 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved); 267 print_ext_name(m, i, info); 268 print_uuid(m, i, info); 269 } 270 } 271 272 static int sysinfo_show(struct seq_file *m, void *v) 273 { 274 void *info = (void *)get_zeroed_page(GFP_KERNEL); 275 int level; 276 277 if (!info) 278 return 0; 279 level = stsi(NULL, 0, 0, 0); 280 if (level >= 1) 281 stsi_1_1_1(m, info); 282 if (level >= 1) 283 stsi_15_1_x(m, info); 284 if (level >= 1) 285 stsi_1_2_2(m, info); 286 if (level >= 2) 287 stsi_2_2_2(m, info); 288 if (level >= 3) 289 stsi_3_2_2(m, info); 290 free_page((unsigned long)info); 291 return 0; 292 } 293 294 static int sysinfo_open(struct inode *inode, struct file *file) 295 { 296 return single_open(file, sysinfo_show, NULL); 297 } 298 299 static const struct file_operations sysinfo_fops = { 300 .open = sysinfo_open, 301 .read = seq_read, 302 .llseek = seq_lseek, 303 .release = single_release, 304 }; 305 306 static int __init sysinfo_create_proc(void) 307 { 308 proc_create("sysinfo", 0444, NULL, &sysinfo_fops); 309 return 0; 310 } 311 device_initcall(sysinfo_create_proc); 312 313 /* 314 * Service levels interface. 315 */ 316 317 static DECLARE_RWSEM(service_level_sem); 318 static LIST_HEAD(service_level_list); 319 320 int register_service_level(struct service_level *slr) 321 { 322 struct service_level *ptr; 323 324 down_write(&service_level_sem); 325 list_for_each_entry(ptr, &service_level_list, list) 326 if (ptr == slr) { 327 up_write(&service_level_sem); 328 return -EEXIST; 329 } 330 list_add_tail(&slr->list, &service_level_list); 331 up_write(&service_level_sem); 332 return 0; 333 } 334 EXPORT_SYMBOL(register_service_level); 335 336 int unregister_service_level(struct service_level *slr) 337 { 338 struct service_level *ptr, *next; 339 int rc = -ENOENT; 340 341 down_write(&service_level_sem); 342 list_for_each_entry_safe(ptr, next, &service_level_list, list) { 343 if (ptr != slr) 344 continue; 345 list_del(&ptr->list); 346 rc = 0; 347 break; 348 } 349 up_write(&service_level_sem); 350 return rc; 351 } 352 EXPORT_SYMBOL(unregister_service_level); 353 354 static void *service_level_start(struct seq_file *m, loff_t *pos) 355 { 356 down_read(&service_level_sem); 357 return seq_list_start(&service_level_list, *pos); 358 } 359 360 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos) 361 { 362 return seq_list_next(p, &service_level_list, pos); 363 } 364 365 static void service_level_stop(struct seq_file *m, void *p) 366 { 367 up_read(&service_level_sem); 368 } 369 370 static int service_level_show(struct seq_file *m, void *p) 371 { 372 struct service_level *slr; 373 374 slr = list_entry(p, struct service_level, list); 375 slr->seq_print(m, slr); 376 return 0; 377 } 378 379 static const struct seq_operations service_level_seq_ops = { 380 .start = service_level_start, 381 .next = service_level_next, 382 .stop = service_level_stop, 383 .show = service_level_show 384 }; 385 386 static int service_level_open(struct inode *inode, struct file *file) 387 { 388 return seq_open(file, &service_level_seq_ops); 389 } 390 391 static const struct file_operations service_level_ops = { 392 .open = service_level_open, 393 .read = seq_read, 394 .llseek = seq_lseek, 395 .release = seq_release 396 }; 397 398 static void service_level_vm_print(struct seq_file *m, 399 struct service_level *slr) 400 { 401 char *query_buffer, *str; 402 403 query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA); 404 if (!query_buffer) 405 return; 406 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL); 407 str = strchr(query_buffer, '\n'); 408 if (str) 409 *str = 0; 410 seq_printf(m, "VM: %s\n", query_buffer); 411 kfree(query_buffer); 412 } 413 414 static struct service_level service_level_vm = { 415 .seq_print = service_level_vm_print 416 }; 417 418 static __init int create_proc_service_level(void) 419 { 420 proc_create("service_levels", 0, NULL, &service_level_ops); 421 if (MACHINE_IS_VM) 422 register_service_level(&service_level_vm); 423 return 0; 424 } 425 subsys_initcall(create_proc_service_level); 426 427 /* 428 * CPU capability might have changed. Therefore recalculate loops_per_jiffy. 429 */ 430 void s390_adjust_jiffies(void) 431 { 432 struct sysinfo_1_2_2 *info; 433 unsigned long capability; 434 struct kernel_fpu fpu; 435 436 info = (void *) get_zeroed_page(GFP_KERNEL); 437 if (!info) 438 return; 439 440 if (stsi(info, 1, 2, 2) == 0) { 441 /* 442 * Major sigh. The cpu capability encoding is "special". 443 * If the first 9 bits of info->capability are 0 then it 444 * is a 32 bit unsigned integer in the range 0 .. 2^23. 445 * If the first 9 bits are != 0 then it is a 32 bit float. 446 * In addition a lower value indicates a proportionally 447 * higher cpu capacity. Bogomips are the other way round. 448 * To get to a halfway suitable number we divide 1e7 449 * by the cpu capability number. Yes, that means a floating 450 * point division .. 451 */ 452 kernel_fpu_begin(&fpu, KERNEL_FPR); 453 asm volatile( 454 " sfpc %3\n" 455 " l %0,%1\n" 456 " tmlh %0,0xff80\n" 457 " jnz 0f\n" 458 " cefbr %%f2,%0\n" 459 " j 1f\n" 460 "0: le %%f2,%1\n" 461 "1: cefbr %%f0,%2\n" 462 " debr %%f0,%%f2\n" 463 " cgebr %0,5,%%f0\n" 464 : "=&d" (capability) 465 : "Q" (info->capability), "d" (10000000), "d" (0) 466 : "cc" 467 ); 468 kernel_fpu_end(&fpu, KERNEL_FPR); 469 } else 470 /* 471 * Really old machine without stsi block for basic 472 * cpu information. Report 42.0 bogomips. 473 */ 474 capability = 42; 475 loops_per_jiffy = capability * (500000/HZ); 476 free_page((unsigned long) info); 477 } 478 479 /* 480 * calibrate the delay loop 481 */ 482 void calibrate_delay(void) 483 { 484 s390_adjust_jiffies(); 485 /* Print the good old Bogomips line .. */ 486 printk(KERN_DEBUG "Calibrating delay loop (skipped)... " 487 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ), 488 (loops_per_jiffy/(5000/HZ)) % 100); 489 } 490 491 #ifdef CONFIG_DEBUG_FS 492 493 #define STSI_FILE(fc, s1, s2) \ 494 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\ 495 { \ 496 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \ 497 if (!file->private_data) \ 498 return -ENOMEM; \ 499 if (stsi(file->private_data, fc, s1, s2)) { \ 500 free_page((unsigned long)file->private_data); \ 501 file->private_data = NULL; \ 502 return -EACCES; \ 503 } \ 504 return nonseekable_open(inode, file); \ 505 } \ 506 \ 507 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \ 508 .open = stsi_open_##fc##_##s1##_##s2, \ 509 .release = stsi_release, \ 510 .read = stsi_read, \ 511 .llseek = no_llseek, \ 512 }; 513 514 static int stsi_release(struct inode *inode, struct file *file) 515 { 516 free_page((unsigned long)file->private_data); 517 return 0; 518 } 519 520 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) 521 { 522 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE); 523 } 524 525 STSI_FILE(15, 1, 2); 526 STSI_FILE(15, 1, 3); 527 STSI_FILE(15, 1, 4); 528 STSI_FILE(15, 1, 5); 529 STSI_FILE(15, 1, 6); 530 531 struct stsi_file { 532 const struct file_operations *fops; 533 char *name; 534 }; 535 536 static struct stsi_file stsi_file[] __initdata = { 537 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"}, 538 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"}, 539 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"}, 540 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"}, 541 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"}, 542 }; 543 544 static __init int stsi_init_debugfs(void) 545 { 546 struct dentry *stsi_root; 547 struct stsi_file *sf; 548 int i; 549 550 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir); 551 if (IS_ERR_OR_NULL(stsi_root)) 552 return 0; 553 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) { 554 sf = &stsi_file[i]; 555 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops); 556 } 557 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) { 558 char link_to[10]; 559 560 sprintf(link_to, "15_1_%d", topology_mnest_limit()); 561 debugfs_create_symlink("topology", stsi_root, link_to); 562 } 563 return 0; 564 } 565 device_initcall(stsi_init_debugfs); 566 567 #endif /* CONFIG_DEBUG_FS */ 568