1 /* 2 * 3 * Procedures for interfacing to the RTAS on CHRP machines. 4 * 5 * Peter Bergner, IBM March 2001. 6 * Copyright (C) 2001 IBM. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #include <stdarg.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/spinlock.h> 18 #include <linux/export.h> 19 #include <linux/init.h> 20 #include <linux/capability.h> 21 #include <linux/delay.h> 22 #include <linux/cpu.h> 23 #include <linux/smp.h> 24 #include <linux/completion.h> 25 #include <linux/cpumask.h> 26 #include <linux/memblock.h> 27 #include <linux/slab.h> 28 #include <linux/reboot.h> 29 30 #include <asm/prom.h> 31 #include <asm/rtas.h> 32 #include <asm/hvcall.h> 33 #include <asm/machdep.h> 34 #include <asm/firmware.h> 35 #include <asm/page.h> 36 #include <asm/param.h> 37 #include <asm/delay.h> 38 #include <asm/uaccess.h> 39 #include <asm/udbg.h> 40 #include <asm/syscalls.h> 41 #include <asm/smp.h> 42 #include <linux/atomic.h> 43 #include <asm/time.h> 44 #include <asm/mmu.h> 45 #include <asm/topology.h> 46 47 struct rtas_t rtas = { 48 .lock = __ARCH_SPIN_LOCK_UNLOCKED 49 }; 50 EXPORT_SYMBOL(rtas); 51 52 DEFINE_SPINLOCK(rtas_data_buf_lock); 53 EXPORT_SYMBOL(rtas_data_buf_lock); 54 55 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; 56 EXPORT_SYMBOL(rtas_data_buf); 57 58 unsigned long rtas_rmo_buf; 59 60 /* 61 * If non-NULL, this gets called when the kernel terminates. 62 * This is done like this so rtas_flash can be a module. 63 */ 64 void (*rtas_flash_term_hook)(int); 65 EXPORT_SYMBOL(rtas_flash_term_hook); 66 67 /* RTAS use home made raw locking instead of spin_lock_irqsave 68 * because those can be called from within really nasty contexts 69 * such as having the timebase stopped which would lockup with 70 * normal locks and spinlock debugging enabled 71 */ 72 static unsigned long lock_rtas(void) 73 { 74 unsigned long flags; 75 76 local_irq_save(flags); 77 preempt_disable(); 78 arch_spin_lock_flags(&rtas.lock, flags); 79 return flags; 80 } 81 82 static void unlock_rtas(unsigned long flags) 83 { 84 arch_spin_unlock(&rtas.lock); 85 local_irq_restore(flags); 86 preempt_enable(); 87 } 88 89 /* 90 * call_rtas_display_status and call_rtas_display_status_delay 91 * are designed only for very early low-level debugging, which 92 * is why the token is hard-coded to 10. 93 */ 94 static void call_rtas_display_status(unsigned char c) 95 { 96 struct rtas_args *args = &rtas.args; 97 unsigned long s; 98 99 if (!rtas.base) 100 return; 101 s = lock_rtas(); 102 103 args->token = cpu_to_be32(10); 104 args->nargs = cpu_to_be32(1); 105 args->nret = cpu_to_be32(1); 106 args->rets = &(args->args[1]); 107 args->args[0] = cpu_to_be32(c); 108 109 enter_rtas(__pa(args)); 110 111 unlock_rtas(s); 112 } 113 114 static void call_rtas_display_status_delay(char c) 115 { 116 static int pending_newline = 0; /* did last write end with unprinted newline? */ 117 static int width = 16; 118 119 if (c == '\n') { 120 while (width-- > 0) 121 call_rtas_display_status(' '); 122 width = 16; 123 mdelay(500); 124 pending_newline = 1; 125 } else { 126 if (pending_newline) { 127 call_rtas_display_status('\r'); 128 call_rtas_display_status('\n'); 129 } 130 pending_newline = 0; 131 if (width--) { 132 call_rtas_display_status(c); 133 udelay(10000); 134 } 135 } 136 } 137 138 void __init udbg_init_rtas_panel(void) 139 { 140 udbg_putc = call_rtas_display_status_delay; 141 } 142 143 #ifdef CONFIG_UDBG_RTAS_CONSOLE 144 145 /* If you think you're dying before early_init_dt_scan_rtas() does its 146 * work, you can hard code the token values for your firmware here and 147 * hardcode rtas.base/entry etc. 148 */ 149 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; 150 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; 151 152 static void udbg_rtascon_putc(char c) 153 { 154 int tries; 155 156 if (!rtas.base) 157 return; 158 159 /* Add CRs before LFs */ 160 if (c == '\n') 161 udbg_rtascon_putc('\r'); 162 163 /* if there is more than one character to be displayed, wait a bit */ 164 for (tries = 0; tries < 16; tries++) { 165 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) 166 break; 167 udelay(1000); 168 } 169 } 170 171 static int udbg_rtascon_getc_poll(void) 172 { 173 int c; 174 175 if (!rtas.base) 176 return -1; 177 178 if (rtas_call(rtas_getchar_token, 0, 2, &c)) 179 return -1; 180 181 return c; 182 } 183 184 static int udbg_rtascon_getc(void) 185 { 186 int c; 187 188 while ((c = udbg_rtascon_getc_poll()) == -1) 189 ; 190 191 return c; 192 } 193 194 195 void __init udbg_init_rtas_console(void) 196 { 197 udbg_putc = udbg_rtascon_putc; 198 udbg_getc = udbg_rtascon_getc; 199 udbg_getc_poll = udbg_rtascon_getc_poll; 200 } 201 #endif /* CONFIG_UDBG_RTAS_CONSOLE */ 202 203 void rtas_progress(char *s, unsigned short hex) 204 { 205 struct device_node *root; 206 int width; 207 const __be32 *p; 208 char *os; 209 static int display_character, set_indicator; 210 static int display_width, display_lines, form_feed; 211 static const int *row_width; 212 static DEFINE_SPINLOCK(progress_lock); 213 static int current_line; 214 static int pending_newline = 0; /* did last write end with unprinted newline? */ 215 216 if (!rtas.base) 217 return; 218 219 if (display_width == 0) { 220 display_width = 0x10; 221 if ((root = of_find_node_by_path("/rtas"))) { 222 if ((p = of_get_property(root, 223 "ibm,display-line-length", NULL))) 224 display_width = be32_to_cpu(*p); 225 if ((p = of_get_property(root, 226 "ibm,form-feed", NULL))) 227 form_feed = be32_to_cpu(*p); 228 if ((p = of_get_property(root, 229 "ibm,display-number-of-lines", NULL))) 230 display_lines = be32_to_cpu(*p); 231 row_width = of_get_property(root, 232 "ibm,display-truncation-length", NULL); 233 of_node_put(root); 234 } 235 display_character = rtas_token("display-character"); 236 set_indicator = rtas_token("set-indicator"); 237 } 238 239 if (display_character == RTAS_UNKNOWN_SERVICE) { 240 /* use hex display if available */ 241 if (set_indicator != RTAS_UNKNOWN_SERVICE) 242 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); 243 return; 244 } 245 246 spin_lock(&progress_lock); 247 248 /* 249 * Last write ended with newline, but we didn't print it since 250 * it would just clear the bottom line of output. Print it now 251 * instead. 252 * 253 * If no newline is pending and form feed is supported, clear the 254 * display with a form feed; otherwise, print a CR to start output 255 * at the beginning of the line. 256 */ 257 if (pending_newline) { 258 rtas_call(display_character, 1, 1, NULL, '\r'); 259 rtas_call(display_character, 1, 1, NULL, '\n'); 260 pending_newline = 0; 261 } else { 262 current_line = 0; 263 if (form_feed) 264 rtas_call(display_character, 1, 1, NULL, 265 (char)form_feed); 266 else 267 rtas_call(display_character, 1, 1, NULL, '\r'); 268 } 269 270 if (row_width) 271 width = row_width[current_line]; 272 else 273 width = display_width; 274 os = s; 275 while (*os) { 276 if (*os == '\n' || *os == '\r') { 277 /* If newline is the last character, save it 278 * until next call to avoid bumping up the 279 * display output. 280 */ 281 if (*os == '\n' && !os[1]) { 282 pending_newline = 1; 283 current_line++; 284 if (current_line > display_lines-1) 285 current_line = display_lines-1; 286 spin_unlock(&progress_lock); 287 return; 288 } 289 290 /* RTAS wants CR-LF, not just LF */ 291 292 if (*os == '\n') { 293 rtas_call(display_character, 1, 1, NULL, '\r'); 294 rtas_call(display_character, 1, 1, NULL, '\n'); 295 } else { 296 /* CR might be used to re-draw a line, so we'll 297 * leave it alone and not add LF. 298 */ 299 rtas_call(display_character, 1, 1, NULL, *os); 300 } 301 302 if (row_width) 303 width = row_width[current_line]; 304 else 305 width = display_width; 306 } else { 307 width--; 308 rtas_call(display_character, 1, 1, NULL, *os); 309 } 310 311 os++; 312 313 /* if we overwrite the screen length */ 314 if (width <= 0) 315 while ((*os != 0) && (*os != '\n') && (*os != '\r')) 316 os++; 317 } 318 319 spin_unlock(&progress_lock); 320 } 321 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ 322 323 int rtas_token(const char *service) 324 { 325 const __be32 *tokp; 326 if (rtas.dev == NULL) 327 return RTAS_UNKNOWN_SERVICE; 328 tokp = of_get_property(rtas.dev, service, NULL); 329 return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE; 330 } 331 EXPORT_SYMBOL(rtas_token); 332 333 int rtas_service_present(const char *service) 334 { 335 return rtas_token(service) != RTAS_UNKNOWN_SERVICE; 336 } 337 EXPORT_SYMBOL(rtas_service_present); 338 339 #ifdef CONFIG_RTAS_ERROR_LOGGING 340 /* 341 * Return the firmware-specified size of the error log buffer 342 * for all rtas calls that require an error buffer argument. 343 * This includes 'check-exception' and 'rtas-last-error'. 344 */ 345 int rtas_get_error_log_max(void) 346 { 347 static int rtas_error_log_max; 348 if (rtas_error_log_max) 349 return rtas_error_log_max; 350 351 rtas_error_log_max = rtas_token ("rtas-error-log-max"); 352 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || 353 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { 354 printk (KERN_WARNING "RTAS: bad log buffer size %d\n", 355 rtas_error_log_max); 356 rtas_error_log_max = RTAS_ERROR_LOG_MAX; 357 } 358 return rtas_error_log_max; 359 } 360 EXPORT_SYMBOL(rtas_get_error_log_max); 361 362 363 static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; 364 static int rtas_last_error_token; 365 366 /** Return a copy of the detailed error text associated with the 367 * most recent failed call to rtas. Because the error text 368 * might go stale if there are any other intervening rtas calls, 369 * this routine must be called atomically with whatever produced 370 * the error (i.e. with rtas.lock still held from the previous call). 371 */ 372 static char *__fetch_rtas_last_error(char *altbuf) 373 { 374 struct rtas_args err_args, save_args; 375 u32 bufsz; 376 char *buf = NULL; 377 378 if (rtas_last_error_token == -1) 379 return NULL; 380 381 bufsz = rtas_get_error_log_max(); 382 383 err_args.token = cpu_to_be32(rtas_last_error_token); 384 err_args.nargs = cpu_to_be32(2); 385 err_args.nret = cpu_to_be32(1); 386 err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); 387 err_args.args[1] = cpu_to_be32(bufsz); 388 err_args.args[2] = 0; 389 390 save_args = rtas.args; 391 rtas.args = err_args; 392 393 enter_rtas(__pa(&rtas.args)); 394 395 err_args = rtas.args; 396 rtas.args = save_args; 397 398 /* Log the error in the unlikely case that there was one. */ 399 if (unlikely(err_args.args[2] == 0)) { 400 if (altbuf) { 401 buf = altbuf; 402 } else { 403 buf = rtas_err_buf; 404 if (slab_is_available()) 405 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); 406 } 407 if (buf) 408 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); 409 } 410 411 return buf; 412 } 413 414 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) 415 416 #else /* CONFIG_RTAS_ERROR_LOGGING */ 417 #define __fetch_rtas_last_error(x) NULL 418 #define get_errorlog_buffer() NULL 419 #endif 420 421 int rtas_call(int token, int nargs, int nret, int *outputs, ...) 422 { 423 va_list list; 424 int i; 425 unsigned long s; 426 struct rtas_args *rtas_args; 427 char *buff_copy = NULL; 428 int ret; 429 430 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) 431 return -1; 432 433 s = lock_rtas(); 434 rtas_args = &rtas.args; 435 436 rtas_args->token = cpu_to_be32(token); 437 rtas_args->nargs = cpu_to_be32(nargs); 438 rtas_args->nret = cpu_to_be32(nret); 439 rtas_args->rets = &(rtas_args->args[nargs]); 440 va_start(list, outputs); 441 for (i = 0; i < nargs; ++i) 442 rtas_args->args[i] = cpu_to_be32(va_arg(list, __u32)); 443 va_end(list); 444 445 for (i = 0; i < nret; ++i) 446 rtas_args->rets[i] = 0; 447 448 enter_rtas(__pa(rtas_args)); 449 450 /* A -1 return code indicates that the last command couldn't 451 be completed due to a hardware error. */ 452 if (be32_to_cpu(rtas_args->rets[0]) == -1) 453 buff_copy = __fetch_rtas_last_error(NULL); 454 455 if (nret > 1 && outputs != NULL) 456 for (i = 0; i < nret-1; ++i) 457 outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); 458 ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; 459 460 unlock_rtas(s); 461 462 if (buff_copy) { 463 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); 464 if (slab_is_available()) 465 kfree(buff_copy); 466 } 467 return ret; 468 } 469 EXPORT_SYMBOL(rtas_call); 470 471 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status 472 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. 473 */ 474 unsigned int rtas_busy_delay_time(int status) 475 { 476 int order; 477 unsigned int ms = 0; 478 479 if (status == RTAS_BUSY) { 480 ms = 1; 481 } else if (status >= RTAS_EXTENDED_DELAY_MIN && 482 status <= RTAS_EXTENDED_DELAY_MAX) { 483 order = status - RTAS_EXTENDED_DELAY_MIN; 484 for (ms = 1; order > 0; order--) 485 ms *= 10; 486 } 487 488 return ms; 489 } 490 EXPORT_SYMBOL(rtas_busy_delay_time); 491 492 /* For an RTAS busy status code, perform the hinted delay. */ 493 unsigned int rtas_busy_delay(int status) 494 { 495 unsigned int ms; 496 497 might_sleep(); 498 ms = rtas_busy_delay_time(status); 499 if (ms && need_resched()) 500 msleep(ms); 501 502 return ms; 503 } 504 EXPORT_SYMBOL(rtas_busy_delay); 505 506 static int rtas_error_rc(int rtas_rc) 507 { 508 int rc; 509 510 switch (rtas_rc) { 511 case -1: /* Hardware Error */ 512 rc = -EIO; 513 break; 514 case -3: /* Bad indicator/domain/etc */ 515 rc = -EINVAL; 516 break; 517 case -9000: /* Isolation error */ 518 rc = -EFAULT; 519 break; 520 case -9001: /* Outstanding TCE/PTE */ 521 rc = -EEXIST; 522 break; 523 case -9002: /* No usable slot */ 524 rc = -ENODEV; 525 break; 526 default: 527 printk(KERN_ERR "%s: unexpected RTAS error %d\n", 528 __func__, rtas_rc); 529 rc = -ERANGE; 530 break; 531 } 532 return rc; 533 } 534 535 int rtas_get_power_level(int powerdomain, int *level) 536 { 537 int token = rtas_token("get-power-level"); 538 int rc; 539 540 if (token == RTAS_UNKNOWN_SERVICE) 541 return -ENOENT; 542 543 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) 544 udelay(1); 545 546 if (rc < 0) 547 return rtas_error_rc(rc); 548 return rc; 549 } 550 EXPORT_SYMBOL(rtas_get_power_level); 551 552 int rtas_set_power_level(int powerdomain, int level, int *setlevel) 553 { 554 int token = rtas_token("set-power-level"); 555 int rc; 556 557 if (token == RTAS_UNKNOWN_SERVICE) 558 return -ENOENT; 559 560 do { 561 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); 562 } while (rtas_busy_delay(rc)); 563 564 if (rc < 0) 565 return rtas_error_rc(rc); 566 return rc; 567 } 568 EXPORT_SYMBOL(rtas_set_power_level); 569 570 int rtas_get_sensor(int sensor, int index, int *state) 571 { 572 int token = rtas_token("get-sensor-state"); 573 int rc; 574 575 if (token == RTAS_UNKNOWN_SERVICE) 576 return -ENOENT; 577 578 do { 579 rc = rtas_call(token, 2, 2, state, sensor, index); 580 } while (rtas_busy_delay(rc)); 581 582 if (rc < 0) 583 return rtas_error_rc(rc); 584 return rc; 585 } 586 EXPORT_SYMBOL(rtas_get_sensor); 587 588 int rtas_get_sensor_fast(int sensor, int index, int *state) 589 { 590 int token = rtas_token("get-sensor-state"); 591 int rc; 592 593 if (token == RTAS_UNKNOWN_SERVICE) 594 return -ENOENT; 595 596 rc = rtas_call(token, 2, 2, state, sensor, index); 597 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && 598 rc <= RTAS_EXTENDED_DELAY_MAX)); 599 600 if (rc < 0) 601 return rtas_error_rc(rc); 602 return rc; 603 } 604 605 bool rtas_indicator_present(int token, int *maxindex) 606 { 607 int proplen, count, i; 608 const struct indicator_elem { 609 __be32 token; 610 __be32 maxindex; 611 } *indicators; 612 613 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); 614 if (!indicators) 615 return false; 616 617 count = proplen / sizeof(struct indicator_elem); 618 619 for (i = 0; i < count; i++) { 620 if (__be32_to_cpu(indicators[i].token) != token) 621 continue; 622 if (maxindex) 623 *maxindex = __be32_to_cpu(indicators[i].maxindex); 624 return true; 625 } 626 627 return false; 628 } 629 EXPORT_SYMBOL(rtas_indicator_present); 630 631 int rtas_set_indicator(int indicator, int index, int new_value) 632 { 633 int token = rtas_token("set-indicator"); 634 int rc; 635 636 if (token == RTAS_UNKNOWN_SERVICE) 637 return -ENOENT; 638 639 do { 640 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); 641 } while (rtas_busy_delay(rc)); 642 643 if (rc < 0) 644 return rtas_error_rc(rc); 645 return rc; 646 } 647 EXPORT_SYMBOL(rtas_set_indicator); 648 649 /* 650 * Ignoring RTAS extended delay 651 */ 652 int rtas_set_indicator_fast(int indicator, int index, int new_value) 653 { 654 int rc; 655 int token = rtas_token("set-indicator"); 656 657 if (token == RTAS_UNKNOWN_SERVICE) 658 return -ENOENT; 659 660 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); 661 662 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && 663 rc <= RTAS_EXTENDED_DELAY_MAX)); 664 665 if (rc < 0) 666 return rtas_error_rc(rc); 667 668 return rc; 669 } 670 671 void rtas_restart(char *cmd) 672 { 673 if (rtas_flash_term_hook) 674 rtas_flash_term_hook(SYS_RESTART); 675 printk("RTAS system-reboot returned %d\n", 676 rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); 677 for (;;); 678 } 679 680 void rtas_power_off(void) 681 { 682 if (rtas_flash_term_hook) 683 rtas_flash_term_hook(SYS_POWER_OFF); 684 /* allow power on only with power button press */ 685 printk("RTAS power-off returned %d\n", 686 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); 687 for (;;); 688 } 689 690 void rtas_halt(void) 691 { 692 if (rtas_flash_term_hook) 693 rtas_flash_term_hook(SYS_HALT); 694 /* allow power on only with power button press */ 695 printk("RTAS power-off returned %d\n", 696 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); 697 for (;;); 698 } 699 700 /* Must be in the RMO region, so we place it here */ 701 static char rtas_os_term_buf[2048]; 702 703 void rtas_os_term(char *str) 704 { 705 int status; 706 707 /* 708 * Firmware with the ibm,extended-os-term property is guaranteed 709 * to always return from an ibm,os-term call. Earlier versions without 710 * this property may terminate the partition which we want to avoid 711 * since it interferes with panic_timeout. 712 */ 713 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || 714 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) 715 return; 716 717 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); 718 719 do { 720 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, 721 __pa(rtas_os_term_buf)); 722 } while (rtas_busy_delay(status)); 723 724 if (status != 0) 725 printk(KERN_EMERG "ibm,os-term call failed %d\n", status); 726 } 727 728 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; 729 #ifdef CONFIG_PPC_PSERIES 730 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) 731 { 732 u16 slb_size = mmu_slb_size; 733 int rc = H_MULTI_THREADS_ACTIVE; 734 int cpu; 735 736 slb_set_size(SLB_MIN_SIZE); 737 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); 738 739 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && 740 !atomic_read(&data->error)) 741 rc = rtas_call(data->token, 0, 1, NULL); 742 743 if (rc || atomic_read(&data->error)) { 744 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); 745 slb_set_size(slb_size); 746 } 747 748 if (atomic_read(&data->error)) 749 rc = atomic_read(&data->error); 750 751 atomic_set(&data->error, rc); 752 pSeries_coalesce_init(); 753 754 if (wake_when_done) { 755 atomic_set(&data->done, 1); 756 757 for_each_online_cpu(cpu) 758 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); 759 } 760 761 if (atomic_dec_return(&data->working) == 0) 762 complete(data->complete); 763 764 return rc; 765 } 766 767 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) 768 { 769 atomic_inc(&data->working); 770 return __rtas_suspend_last_cpu(data, 0); 771 } 772 773 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) 774 { 775 long rc = H_SUCCESS; 776 unsigned long msr_save; 777 int cpu; 778 779 atomic_inc(&data->working); 780 781 /* really need to ensure MSR.EE is off for H_JOIN */ 782 msr_save = mfmsr(); 783 mtmsr(msr_save & ~(MSR_EE)); 784 785 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) 786 rc = plpar_hcall_norets(H_JOIN); 787 788 mtmsr(msr_save); 789 790 if (rc == H_SUCCESS) { 791 /* This cpu was prodded and the suspend is complete. */ 792 goto out; 793 } else if (rc == H_CONTINUE) { 794 /* All other cpus are in H_JOIN, this cpu does 795 * the suspend. 796 */ 797 return __rtas_suspend_last_cpu(data, wake_when_done); 798 } else { 799 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", 800 smp_processor_id(), rc); 801 atomic_set(&data->error, rc); 802 } 803 804 if (wake_when_done) { 805 atomic_set(&data->done, 1); 806 807 /* This cpu did the suspend or got an error; in either case, 808 * we need to prod all other other cpus out of join state. 809 * Extra prods are harmless. 810 */ 811 for_each_online_cpu(cpu) 812 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); 813 } 814 out: 815 if (atomic_dec_return(&data->working) == 0) 816 complete(data->complete); 817 return rc; 818 } 819 820 int rtas_suspend_cpu(struct rtas_suspend_me_data *data) 821 { 822 return __rtas_suspend_cpu(data, 0); 823 } 824 825 static void rtas_percpu_suspend_me(void *info) 826 { 827 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); 828 } 829 830 enum rtas_cpu_state { 831 DOWN, 832 UP, 833 }; 834 835 #ifndef CONFIG_SMP 836 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, 837 cpumask_var_t cpus) 838 { 839 if (!cpumask_empty(cpus)) { 840 cpumask_clear(cpus); 841 return -EINVAL; 842 } else 843 return 0; 844 } 845 #else 846 /* On return cpumask will be altered to indicate CPUs changed. 847 * CPUs with states changed will be set in the mask, 848 * CPUs with status unchanged will be unset in the mask. */ 849 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, 850 cpumask_var_t cpus) 851 { 852 int cpu; 853 int cpuret = 0; 854 int ret = 0; 855 856 if (cpumask_empty(cpus)) 857 return 0; 858 859 for_each_cpu(cpu, cpus) { 860 switch (state) { 861 case DOWN: 862 cpuret = cpu_down(cpu); 863 break; 864 case UP: 865 cpuret = cpu_up(cpu); 866 break; 867 } 868 if (cpuret) { 869 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n", 870 __func__, 871 ((state == UP) ? "up" : "down"), 872 cpu, cpuret); 873 if (!ret) 874 ret = cpuret; 875 if (state == UP) { 876 /* clear bits for unchanged cpus, return */ 877 cpumask_shift_right(cpus, cpus, cpu); 878 cpumask_shift_left(cpus, cpus, cpu); 879 break; 880 } else { 881 /* clear bit for unchanged cpu, continue */ 882 cpumask_clear_cpu(cpu, cpus); 883 } 884 } 885 } 886 887 return ret; 888 } 889 #endif 890 891 int rtas_online_cpus_mask(cpumask_var_t cpus) 892 { 893 int ret; 894 895 ret = rtas_cpu_state_change_mask(UP, cpus); 896 897 if (ret) { 898 cpumask_var_t tmp_mask; 899 900 if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY)) 901 return ret; 902 903 /* Use tmp_mask to preserve cpus mask from first failure */ 904 cpumask_copy(tmp_mask, cpus); 905 rtas_offline_cpus_mask(tmp_mask); 906 free_cpumask_var(tmp_mask); 907 } 908 909 return ret; 910 } 911 EXPORT_SYMBOL(rtas_online_cpus_mask); 912 913 int rtas_offline_cpus_mask(cpumask_var_t cpus) 914 { 915 return rtas_cpu_state_change_mask(DOWN, cpus); 916 } 917 EXPORT_SYMBOL(rtas_offline_cpus_mask); 918 919 int rtas_ibm_suspend_me(u64 handle) 920 { 921 long state; 922 long rc; 923 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 924 struct rtas_suspend_me_data data; 925 DECLARE_COMPLETION_ONSTACK(done); 926 cpumask_var_t offline_mask; 927 int cpuret; 928 929 if (!rtas_service_present("ibm,suspend-me")) 930 return -ENOSYS; 931 932 /* Make sure the state is valid */ 933 rc = plpar_hcall(H_VASI_STATE, retbuf, handle); 934 935 state = retbuf[0]; 936 937 if (rc) { 938 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); 939 return rc; 940 } else if (state == H_VASI_ENABLED) { 941 return -EAGAIN; 942 } else if (state != H_VASI_SUSPENDING) { 943 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", 944 state); 945 return -EIO; 946 } 947 948 if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY)) 949 return -ENOMEM; 950 951 atomic_set(&data.working, 0); 952 atomic_set(&data.done, 0); 953 atomic_set(&data.error, 0); 954 data.token = rtas_token("ibm,suspend-me"); 955 data.complete = &done; 956 957 /* All present CPUs must be online */ 958 cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask); 959 cpuret = rtas_online_cpus_mask(offline_mask); 960 if (cpuret) { 961 pr_err("%s: Could not bring present CPUs online.\n", __func__); 962 atomic_set(&data.error, cpuret); 963 goto out; 964 } 965 966 stop_topology_update(); 967 968 /* Call function on all CPUs. One of us will make the 969 * rtas call 970 */ 971 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) 972 atomic_set(&data.error, -EINVAL); 973 974 wait_for_completion(&done); 975 976 if (atomic_read(&data.error) != 0) 977 printk(KERN_ERR "Error doing global join\n"); 978 979 start_topology_update(); 980 981 /* Take down CPUs not online prior to suspend */ 982 cpuret = rtas_offline_cpus_mask(offline_mask); 983 if (cpuret) 984 pr_warn("%s: Could not restore CPUs to offline state.\n", 985 __func__); 986 987 out: 988 free_cpumask_var(offline_mask); 989 return atomic_read(&data.error); 990 } 991 #else /* CONFIG_PPC_PSERIES */ 992 int rtas_ibm_suspend_me(u64 handle) 993 { 994 return -ENOSYS; 995 } 996 #endif 997 998 /** 999 * Find a specific pseries error log in an RTAS extended event log. 1000 * @log: RTAS error/event log 1001 * @section_id: two character section identifier 1002 * 1003 * Returns a pointer to the specified errorlog or NULL if not found. 1004 */ 1005 struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, 1006 uint16_t section_id) 1007 { 1008 struct rtas_ext_event_log_v6 *ext_log = 1009 (struct rtas_ext_event_log_v6 *)log->buffer; 1010 struct pseries_errorlog *sect; 1011 unsigned char *p, *log_end; 1012 uint32_t ext_log_length = rtas_error_extended_log_length(log); 1013 uint8_t log_format = rtas_ext_event_log_format(ext_log); 1014 uint32_t company_id = rtas_ext_event_company_id(ext_log); 1015 1016 /* Check that we understand the format */ 1017 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) || 1018 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || 1019 company_id != RTAS_V6EXT_COMPANY_ID_IBM) 1020 return NULL; 1021 1022 log_end = log->buffer + ext_log_length; 1023 p = ext_log->vendor_log; 1024 1025 while (p < log_end) { 1026 sect = (struct pseries_errorlog *)p; 1027 if (pseries_errorlog_id(sect) == section_id) 1028 return sect; 1029 p += pseries_errorlog_length(sect); 1030 } 1031 1032 return NULL; 1033 } 1034 1035 /* We assume to be passed big endian arguments */ 1036 asmlinkage int ppc_rtas(struct rtas_args __user *uargs) 1037 { 1038 struct rtas_args args; 1039 unsigned long flags; 1040 char *buff_copy, *errbuf = NULL; 1041 int nargs, nret, token; 1042 1043 if (!capable(CAP_SYS_ADMIN)) 1044 return -EPERM; 1045 1046 if (!rtas.entry) 1047 return -EINVAL; 1048 1049 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) 1050 return -EFAULT; 1051 1052 nargs = be32_to_cpu(args.nargs); 1053 nret = be32_to_cpu(args.nret); 1054 token = be32_to_cpu(args.token); 1055 1056 if (nargs > ARRAY_SIZE(args.args) 1057 || nret > ARRAY_SIZE(args.args) 1058 || nargs + nret > ARRAY_SIZE(args.args)) 1059 return -EINVAL; 1060 1061 /* Copy in args. */ 1062 if (copy_from_user(args.args, uargs->args, 1063 nargs * sizeof(rtas_arg_t)) != 0) 1064 return -EFAULT; 1065 1066 if (token == RTAS_UNKNOWN_SERVICE) 1067 return -EINVAL; 1068 1069 args.rets = &args.args[nargs]; 1070 memset(args.rets, 0, nret * sizeof(rtas_arg_t)); 1071 1072 /* Need to handle ibm,suspend_me call specially */ 1073 if (token == ibm_suspend_me_token) { 1074 1075 /* 1076 * rtas_ibm_suspend_me assumes the streamid handle is in cpu 1077 * endian, or at least the hcall within it requires it. 1078 */ 1079 int rc = 0; 1080 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32) 1081 | be32_to_cpu(args.args[1]); 1082 rc = rtas_ibm_suspend_me(handle); 1083 if (rc == -EAGAIN) 1084 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE); 1085 else if (rc == -EIO) 1086 args.rets[0] = cpu_to_be32(-1); 1087 else if (rc) 1088 return rc; 1089 goto copy_return; 1090 } 1091 1092 buff_copy = get_errorlog_buffer(); 1093 1094 flags = lock_rtas(); 1095 1096 rtas.args = args; 1097 enter_rtas(__pa(&rtas.args)); 1098 args = rtas.args; 1099 1100 /* A -1 return code indicates that the last command couldn't 1101 be completed due to a hardware error. */ 1102 if (be32_to_cpu(args.rets[0]) == -1) 1103 errbuf = __fetch_rtas_last_error(buff_copy); 1104 1105 unlock_rtas(flags); 1106 1107 if (buff_copy) { 1108 if (errbuf) 1109 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); 1110 kfree(buff_copy); 1111 } 1112 1113 copy_return: 1114 /* Copy out args. */ 1115 if (copy_to_user(uargs->args + nargs, 1116 args.args + nargs, 1117 nret * sizeof(rtas_arg_t)) != 0) 1118 return -EFAULT; 1119 1120 return 0; 1121 } 1122 1123 /* 1124 * Call early during boot, before mem init, to retrieve the RTAS 1125 * information from the device-tree and allocate the RMO buffer for userland 1126 * accesses. 1127 */ 1128 void __init rtas_initialize(void) 1129 { 1130 unsigned long rtas_region = RTAS_INSTANTIATE_MAX; 1131 1132 /* Get RTAS dev node and fill up our "rtas" structure with infos 1133 * about it. 1134 */ 1135 rtas.dev = of_find_node_by_name(NULL, "rtas"); 1136 if (rtas.dev) { 1137 const __be32 *basep, *entryp, *sizep; 1138 1139 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); 1140 sizep = of_get_property(rtas.dev, "rtas-size", NULL); 1141 if (basep != NULL && sizep != NULL) { 1142 rtas.base = __be32_to_cpu(*basep); 1143 rtas.size = __be32_to_cpu(*sizep); 1144 entryp = of_get_property(rtas.dev, 1145 "linux,rtas-entry", NULL); 1146 if (entryp == NULL) /* Ugh */ 1147 rtas.entry = rtas.base; 1148 else 1149 rtas.entry = __be32_to_cpu(*entryp); 1150 } else 1151 rtas.dev = NULL; 1152 } 1153 if (!rtas.dev) 1154 return; 1155 1156 /* If RTAS was found, allocate the RMO buffer for it and look for 1157 * the stop-self token if any 1158 */ 1159 #ifdef CONFIG_PPC64 1160 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { 1161 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); 1162 ibm_suspend_me_token = rtas_token("ibm,suspend-me"); 1163 } 1164 #endif 1165 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); 1166 1167 #ifdef CONFIG_RTAS_ERROR_LOGGING 1168 rtas_last_error_token = rtas_token("rtas-last-error"); 1169 #endif 1170 } 1171 1172 int __init early_init_dt_scan_rtas(unsigned long node, 1173 const char *uname, int depth, void *data) 1174 { 1175 const u32 *basep, *entryp, *sizep; 1176 1177 if (depth != 1 || strcmp(uname, "rtas") != 0) 1178 return 0; 1179 1180 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); 1181 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); 1182 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); 1183 1184 if (basep && entryp && sizep) { 1185 rtas.base = *basep; 1186 rtas.entry = *entryp; 1187 rtas.size = *sizep; 1188 } 1189 1190 #ifdef CONFIG_UDBG_RTAS_CONSOLE 1191 basep = of_get_flat_dt_prop(node, "put-term-char", NULL); 1192 if (basep) 1193 rtas_putchar_token = *basep; 1194 1195 basep = of_get_flat_dt_prop(node, "get-term-char", NULL); 1196 if (basep) 1197 rtas_getchar_token = *basep; 1198 1199 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && 1200 rtas_getchar_token != RTAS_UNKNOWN_SERVICE) 1201 udbg_init_rtas_console(); 1202 1203 #endif 1204 1205 /* break now */ 1206 return 1; 1207 } 1208 1209 static arch_spinlock_t timebase_lock; 1210 static u64 timebase = 0; 1211 1212 void rtas_give_timebase(void) 1213 { 1214 unsigned long flags; 1215 1216 local_irq_save(flags); 1217 hard_irq_disable(); 1218 arch_spin_lock(&timebase_lock); 1219 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); 1220 timebase = get_tb(); 1221 arch_spin_unlock(&timebase_lock); 1222 1223 while (timebase) 1224 barrier(); 1225 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); 1226 local_irq_restore(flags); 1227 } 1228 1229 void rtas_take_timebase(void) 1230 { 1231 while (!timebase) 1232 barrier(); 1233 arch_spin_lock(&timebase_lock); 1234 set_tb(timebase >> 32, timebase & 0xffffffff); 1235 timebase = 0; 1236 arch_spin_unlock(&timebase_lock); 1237 } 1238