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/module.h> 19 #include <linux/init.h> 20 #include <linux/capability.h> 21 #include <linux/delay.h> 22 #include <linux/smp.h> 23 #include <linux/completion.h> 24 #include <linux/cpumask.h> 25 #include <linux/memblock.h> 26 #include <linux/slab.h> 27 28 #include <asm/prom.h> 29 #include <asm/rtas.h> 30 #include <asm/hvcall.h> 31 #include <asm/machdep.h> 32 #include <asm/firmware.h> 33 #include <asm/page.h> 34 #include <asm/param.h> 35 #include <asm/system.h> 36 #include <asm/delay.h> 37 #include <asm/uaccess.h> 38 #include <asm/udbg.h> 39 #include <asm/syscalls.h> 40 #include <asm/smp.h> 41 #include <asm/atomic.h> 42 #include <asm/time.h> 43 #include <asm/mmu.h> 44 45 struct rtas_t rtas = { 46 .lock = __ARCH_SPIN_LOCK_UNLOCKED 47 }; 48 EXPORT_SYMBOL(rtas); 49 50 struct rtas_suspend_me_data { 51 atomic_t working; /* number of cpus accessing this struct */ 52 atomic_t done; 53 int token; /* ibm,suspend-me */ 54 int error; 55 struct completion *complete; /* wait on this until working == 0 */ 56 }; 57 58 DEFINE_SPINLOCK(rtas_data_buf_lock); 59 EXPORT_SYMBOL(rtas_data_buf_lock); 60 61 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; 62 EXPORT_SYMBOL(rtas_data_buf); 63 64 unsigned long rtas_rmo_buf; 65 66 /* 67 * If non-NULL, this gets called when the kernel terminates. 68 * This is done like this so rtas_flash can be a module. 69 */ 70 void (*rtas_flash_term_hook)(int); 71 EXPORT_SYMBOL(rtas_flash_term_hook); 72 73 /* RTAS use home made raw locking instead of spin_lock_irqsave 74 * because those can be called from within really nasty contexts 75 * such as having the timebase stopped which would lockup with 76 * normal locks and spinlock debugging enabled 77 */ 78 static unsigned long lock_rtas(void) 79 { 80 unsigned long flags; 81 82 local_irq_save(flags); 83 preempt_disable(); 84 arch_spin_lock_flags(&rtas.lock, flags); 85 return flags; 86 } 87 88 static void unlock_rtas(unsigned long flags) 89 { 90 arch_spin_unlock(&rtas.lock); 91 local_irq_restore(flags); 92 preempt_enable(); 93 } 94 95 /* 96 * call_rtas_display_status and call_rtas_display_status_delay 97 * are designed only for very early low-level debugging, which 98 * is why the token is hard-coded to 10. 99 */ 100 static void call_rtas_display_status(char c) 101 { 102 struct rtas_args *args = &rtas.args; 103 unsigned long s; 104 105 if (!rtas.base) 106 return; 107 s = lock_rtas(); 108 109 args->token = 10; 110 args->nargs = 1; 111 args->nret = 1; 112 args->rets = (rtas_arg_t *)&(args->args[1]); 113 args->args[0] = (unsigned char)c; 114 115 enter_rtas(__pa(args)); 116 117 unlock_rtas(s); 118 } 119 120 static void call_rtas_display_status_delay(char c) 121 { 122 static int pending_newline = 0; /* did last write end with unprinted newline? */ 123 static int width = 16; 124 125 if (c == '\n') { 126 while (width-- > 0) 127 call_rtas_display_status(' '); 128 width = 16; 129 mdelay(500); 130 pending_newline = 1; 131 } else { 132 if (pending_newline) { 133 call_rtas_display_status('\r'); 134 call_rtas_display_status('\n'); 135 } 136 pending_newline = 0; 137 if (width--) { 138 call_rtas_display_status(c); 139 udelay(10000); 140 } 141 } 142 } 143 144 void __init udbg_init_rtas_panel(void) 145 { 146 udbg_putc = call_rtas_display_status_delay; 147 } 148 149 #ifdef CONFIG_UDBG_RTAS_CONSOLE 150 151 /* If you think you're dying before early_init_dt_scan_rtas() does its 152 * work, you can hard code the token values for your firmware here and 153 * hardcode rtas.base/entry etc. 154 */ 155 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; 156 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; 157 158 static void udbg_rtascon_putc(char c) 159 { 160 int tries; 161 162 if (!rtas.base) 163 return; 164 165 /* Add CRs before LFs */ 166 if (c == '\n') 167 udbg_rtascon_putc('\r'); 168 169 /* if there is more than one character to be displayed, wait a bit */ 170 for (tries = 0; tries < 16; tries++) { 171 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) 172 break; 173 udelay(1000); 174 } 175 } 176 177 static int udbg_rtascon_getc_poll(void) 178 { 179 int c; 180 181 if (!rtas.base) 182 return -1; 183 184 if (rtas_call(rtas_getchar_token, 0, 2, &c)) 185 return -1; 186 187 return c; 188 } 189 190 static int udbg_rtascon_getc(void) 191 { 192 int c; 193 194 while ((c = udbg_rtascon_getc_poll()) == -1) 195 ; 196 197 return c; 198 } 199 200 201 void __init udbg_init_rtas_console(void) 202 { 203 udbg_putc = udbg_rtascon_putc; 204 udbg_getc = udbg_rtascon_getc; 205 udbg_getc_poll = udbg_rtascon_getc_poll; 206 } 207 #endif /* CONFIG_UDBG_RTAS_CONSOLE */ 208 209 void rtas_progress(char *s, unsigned short hex) 210 { 211 struct device_node *root; 212 int width; 213 const int *p; 214 char *os; 215 static int display_character, set_indicator; 216 static int display_width, display_lines, form_feed; 217 static const int *row_width; 218 static DEFINE_SPINLOCK(progress_lock); 219 static int current_line; 220 static int pending_newline = 0; /* did last write end with unprinted newline? */ 221 222 if (!rtas.base) 223 return; 224 225 if (display_width == 0) { 226 display_width = 0x10; 227 if ((root = of_find_node_by_path("/rtas"))) { 228 if ((p = of_get_property(root, 229 "ibm,display-line-length", NULL))) 230 display_width = *p; 231 if ((p = of_get_property(root, 232 "ibm,form-feed", NULL))) 233 form_feed = *p; 234 if ((p = of_get_property(root, 235 "ibm,display-number-of-lines", NULL))) 236 display_lines = *p; 237 row_width = of_get_property(root, 238 "ibm,display-truncation-length", NULL); 239 of_node_put(root); 240 } 241 display_character = rtas_token("display-character"); 242 set_indicator = rtas_token("set-indicator"); 243 } 244 245 if (display_character == RTAS_UNKNOWN_SERVICE) { 246 /* use hex display if available */ 247 if (set_indicator != RTAS_UNKNOWN_SERVICE) 248 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); 249 return; 250 } 251 252 spin_lock(&progress_lock); 253 254 /* 255 * Last write ended with newline, but we didn't print it since 256 * it would just clear the bottom line of output. Print it now 257 * instead. 258 * 259 * If no newline is pending and form feed is supported, clear the 260 * display with a form feed; otherwise, print a CR to start output 261 * at the beginning of the line. 262 */ 263 if (pending_newline) { 264 rtas_call(display_character, 1, 1, NULL, '\r'); 265 rtas_call(display_character, 1, 1, NULL, '\n'); 266 pending_newline = 0; 267 } else { 268 current_line = 0; 269 if (form_feed) 270 rtas_call(display_character, 1, 1, NULL, 271 (char)form_feed); 272 else 273 rtas_call(display_character, 1, 1, NULL, '\r'); 274 } 275 276 if (row_width) 277 width = row_width[current_line]; 278 else 279 width = display_width; 280 os = s; 281 while (*os) { 282 if (*os == '\n' || *os == '\r') { 283 /* If newline is the last character, save it 284 * until next call to avoid bumping up the 285 * display output. 286 */ 287 if (*os == '\n' && !os[1]) { 288 pending_newline = 1; 289 current_line++; 290 if (current_line > display_lines-1) 291 current_line = display_lines-1; 292 spin_unlock(&progress_lock); 293 return; 294 } 295 296 /* RTAS wants CR-LF, not just LF */ 297 298 if (*os == '\n') { 299 rtas_call(display_character, 1, 1, NULL, '\r'); 300 rtas_call(display_character, 1, 1, NULL, '\n'); 301 } else { 302 /* CR might be used to re-draw a line, so we'll 303 * leave it alone and not add LF. 304 */ 305 rtas_call(display_character, 1, 1, NULL, *os); 306 } 307 308 if (row_width) 309 width = row_width[current_line]; 310 else 311 width = display_width; 312 } else { 313 width--; 314 rtas_call(display_character, 1, 1, NULL, *os); 315 } 316 317 os++; 318 319 /* if we overwrite the screen length */ 320 if (width <= 0) 321 while ((*os != 0) && (*os != '\n') && (*os != '\r')) 322 os++; 323 } 324 325 spin_unlock(&progress_lock); 326 } 327 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ 328 329 int rtas_token(const char *service) 330 { 331 const int *tokp; 332 if (rtas.dev == NULL) 333 return RTAS_UNKNOWN_SERVICE; 334 tokp = of_get_property(rtas.dev, service, NULL); 335 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; 336 } 337 EXPORT_SYMBOL(rtas_token); 338 339 int rtas_service_present(const char *service) 340 { 341 return rtas_token(service) != RTAS_UNKNOWN_SERVICE; 342 } 343 EXPORT_SYMBOL(rtas_service_present); 344 345 #ifdef CONFIG_RTAS_ERROR_LOGGING 346 /* 347 * Return the firmware-specified size of the error log buffer 348 * for all rtas calls that require an error buffer argument. 349 * This includes 'check-exception' and 'rtas-last-error'. 350 */ 351 int rtas_get_error_log_max(void) 352 { 353 static int rtas_error_log_max; 354 if (rtas_error_log_max) 355 return rtas_error_log_max; 356 357 rtas_error_log_max = rtas_token ("rtas-error-log-max"); 358 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || 359 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { 360 printk (KERN_WARNING "RTAS: bad log buffer size %d\n", 361 rtas_error_log_max); 362 rtas_error_log_max = RTAS_ERROR_LOG_MAX; 363 } 364 return rtas_error_log_max; 365 } 366 EXPORT_SYMBOL(rtas_get_error_log_max); 367 368 369 static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; 370 static int rtas_last_error_token; 371 372 /** Return a copy of the detailed error text associated with the 373 * most recent failed call to rtas. Because the error text 374 * might go stale if there are any other intervening rtas calls, 375 * this routine must be called atomically with whatever produced 376 * the error (i.e. with rtas.lock still held from the previous call). 377 */ 378 static char *__fetch_rtas_last_error(char *altbuf) 379 { 380 struct rtas_args err_args, save_args; 381 u32 bufsz; 382 char *buf = NULL; 383 384 if (rtas_last_error_token == -1) 385 return NULL; 386 387 bufsz = rtas_get_error_log_max(); 388 389 err_args.token = rtas_last_error_token; 390 err_args.nargs = 2; 391 err_args.nret = 1; 392 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); 393 err_args.args[1] = bufsz; 394 err_args.args[2] = 0; 395 396 save_args = rtas.args; 397 rtas.args = err_args; 398 399 enter_rtas(__pa(&rtas.args)); 400 401 err_args = rtas.args; 402 rtas.args = save_args; 403 404 /* Log the error in the unlikely case that there was one. */ 405 if (unlikely(err_args.args[2] == 0)) { 406 if (altbuf) { 407 buf = altbuf; 408 } else { 409 buf = rtas_err_buf; 410 if (mem_init_done) 411 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); 412 } 413 if (buf) 414 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); 415 } 416 417 return buf; 418 } 419 420 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) 421 422 #else /* CONFIG_RTAS_ERROR_LOGGING */ 423 #define __fetch_rtas_last_error(x) NULL 424 #define get_errorlog_buffer() NULL 425 #endif 426 427 int rtas_call(int token, int nargs, int nret, int *outputs, ...) 428 { 429 va_list list; 430 int i; 431 unsigned long s; 432 struct rtas_args *rtas_args; 433 char *buff_copy = NULL; 434 int ret; 435 436 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) 437 return -1; 438 439 s = lock_rtas(); 440 rtas_args = &rtas.args; 441 442 rtas_args->token = token; 443 rtas_args->nargs = nargs; 444 rtas_args->nret = nret; 445 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); 446 va_start(list, outputs); 447 for (i = 0; i < nargs; ++i) 448 rtas_args->args[i] = va_arg(list, rtas_arg_t); 449 va_end(list); 450 451 for (i = 0; i < nret; ++i) 452 rtas_args->rets[i] = 0; 453 454 enter_rtas(__pa(rtas_args)); 455 456 /* A -1 return code indicates that the last command couldn't 457 be completed due to a hardware error. */ 458 if (rtas_args->rets[0] == -1) 459 buff_copy = __fetch_rtas_last_error(NULL); 460 461 if (nret > 1 && outputs != NULL) 462 for (i = 0; i < nret-1; ++i) 463 outputs[i] = rtas_args->rets[i+1]; 464 ret = (nret > 0)? rtas_args->rets[0]: 0; 465 466 unlock_rtas(s); 467 468 if (buff_copy) { 469 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); 470 if (mem_init_done) 471 kfree(buff_copy); 472 } 473 return ret; 474 } 475 EXPORT_SYMBOL(rtas_call); 476 477 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status 478 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. 479 */ 480 unsigned int rtas_busy_delay_time(int status) 481 { 482 int order; 483 unsigned int ms = 0; 484 485 if (status == RTAS_BUSY) { 486 ms = 1; 487 } else if (status >= 9900 && status <= 9905) { 488 order = status - 9900; 489 for (ms = 1; order > 0; order--) 490 ms *= 10; 491 } 492 493 return ms; 494 } 495 EXPORT_SYMBOL(rtas_busy_delay_time); 496 497 /* For an RTAS busy status code, perform the hinted delay. */ 498 unsigned int rtas_busy_delay(int status) 499 { 500 unsigned int ms; 501 502 might_sleep(); 503 ms = rtas_busy_delay_time(status); 504 if (ms) 505 msleep(ms); 506 507 return ms; 508 } 509 EXPORT_SYMBOL(rtas_busy_delay); 510 511 static int rtas_error_rc(int rtas_rc) 512 { 513 int rc; 514 515 switch (rtas_rc) { 516 case -1: /* Hardware Error */ 517 rc = -EIO; 518 break; 519 case -3: /* Bad indicator/domain/etc */ 520 rc = -EINVAL; 521 break; 522 case -9000: /* Isolation error */ 523 rc = -EFAULT; 524 break; 525 case -9001: /* Outstanding TCE/PTE */ 526 rc = -EEXIST; 527 break; 528 case -9002: /* No usable slot */ 529 rc = -ENODEV; 530 break; 531 default: 532 printk(KERN_ERR "%s: unexpected RTAS error %d\n", 533 __func__, rtas_rc); 534 rc = -ERANGE; 535 break; 536 } 537 return rc; 538 } 539 540 int rtas_get_power_level(int powerdomain, int *level) 541 { 542 int token = rtas_token("get-power-level"); 543 int rc; 544 545 if (token == RTAS_UNKNOWN_SERVICE) 546 return -ENOENT; 547 548 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) 549 udelay(1); 550 551 if (rc < 0) 552 return rtas_error_rc(rc); 553 return rc; 554 } 555 EXPORT_SYMBOL(rtas_get_power_level); 556 557 int rtas_set_power_level(int powerdomain, int level, int *setlevel) 558 { 559 int token = rtas_token("set-power-level"); 560 int rc; 561 562 if (token == RTAS_UNKNOWN_SERVICE) 563 return -ENOENT; 564 565 do { 566 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); 567 } while (rtas_busy_delay(rc)); 568 569 if (rc < 0) 570 return rtas_error_rc(rc); 571 return rc; 572 } 573 EXPORT_SYMBOL(rtas_set_power_level); 574 575 int rtas_get_sensor(int sensor, int index, int *state) 576 { 577 int token = rtas_token("get-sensor-state"); 578 int rc; 579 580 if (token == RTAS_UNKNOWN_SERVICE) 581 return -ENOENT; 582 583 do { 584 rc = rtas_call(token, 2, 2, state, sensor, index); 585 } while (rtas_busy_delay(rc)); 586 587 if (rc < 0) 588 return rtas_error_rc(rc); 589 return rc; 590 } 591 EXPORT_SYMBOL(rtas_get_sensor); 592 593 bool rtas_indicator_present(int token, int *maxindex) 594 { 595 int proplen, count, i; 596 const struct indicator_elem { 597 u32 token; 598 u32 maxindex; 599 } *indicators; 600 601 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); 602 if (!indicators) 603 return false; 604 605 count = proplen / sizeof(struct indicator_elem); 606 607 for (i = 0; i < count; i++) { 608 if (indicators[i].token != token) 609 continue; 610 if (maxindex) 611 *maxindex = indicators[i].maxindex; 612 return true; 613 } 614 615 return false; 616 } 617 EXPORT_SYMBOL(rtas_indicator_present); 618 619 int rtas_set_indicator(int indicator, int index, int new_value) 620 { 621 int token = rtas_token("set-indicator"); 622 int rc; 623 624 if (token == RTAS_UNKNOWN_SERVICE) 625 return -ENOENT; 626 627 do { 628 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); 629 } while (rtas_busy_delay(rc)); 630 631 if (rc < 0) 632 return rtas_error_rc(rc); 633 return rc; 634 } 635 EXPORT_SYMBOL(rtas_set_indicator); 636 637 /* 638 * Ignoring RTAS extended delay 639 */ 640 int rtas_set_indicator_fast(int indicator, int index, int new_value) 641 { 642 int rc; 643 int token = rtas_token("set-indicator"); 644 645 if (token == RTAS_UNKNOWN_SERVICE) 646 return -ENOENT; 647 648 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); 649 650 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); 651 652 if (rc < 0) 653 return rtas_error_rc(rc); 654 655 return rc; 656 } 657 658 void rtas_restart(char *cmd) 659 { 660 if (rtas_flash_term_hook) 661 rtas_flash_term_hook(SYS_RESTART); 662 printk("RTAS system-reboot returned %d\n", 663 rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); 664 for (;;); 665 } 666 667 void rtas_power_off(void) 668 { 669 if (rtas_flash_term_hook) 670 rtas_flash_term_hook(SYS_POWER_OFF); 671 /* allow power on only with power button press */ 672 printk("RTAS power-off returned %d\n", 673 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); 674 for (;;); 675 } 676 677 void rtas_halt(void) 678 { 679 if (rtas_flash_term_hook) 680 rtas_flash_term_hook(SYS_HALT); 681 /* allow power on only with power button press */ 682 printk("RTAS power-off returned %d\n", 683 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); 684 for (;;); 685 } 686 687 /* Must be in the RMO region, so we place it here */ 688 static char rtas_os_term_buf[2048]; 689 690 void rtas_os_term(char *str) 691 { 692 int status; 693 694 /* 695 * Firmware with the ibm,extended-os-term property is guaranteed 696 * to always return from an ibm,os-term call. Earlier versions without 697 * this property may terminate the partition which we want to avoid 698 * since it interferes with panic_timeout. 699 */ 700 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || 701 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) 702 return; 703 704 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); 705 706 do { 707 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, 708 __pa(rtas_os_term_buf)); 709 } while (rtas_busy_delay(status)); 710 711 if (status != 0) 712 printk(KERN_EMERG "ibm,os-term call failed %d\n", status); 713 } 714 715 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; 716 #ifdef CONFIG_PPC_PSERIES 717 static void rtas_percpu_suspend_me(void *info) 718 { 719 long rc = H_SUCCESS; 720 unsigned long msr_save; 721 u16 slb_size = mmu_slb_size; 722 int cpu; 723 struct rtas_suspend_me_data *data = 724 (struct rtas_suspend_me_data *)info; 725 726 atomic_inc(&data->working); 727 728 /* really need to ensure MSR.EE is off for H_JOIN */ 729 msr_save = mfmsr(); 730 mtmsr(msr_save & ~(MSR_EE)); 731 732 while (rc == H_SUCCESS && !atomic_read(&data->done)) 733 rc = plpar_hcall_norets(H_JOIN); 734 735 mtmsr(msr_save); 736 737 if (rc == H_SUCCESS) { 738 /* This cpu was prodded and the suspend is complete. */ 739 goto out; 740 } else if (rc == H_CONTINUE) { 741 /* All other cpus are in H_JOIN, this cpu does 742 * the suspend. 743 */ 744 slb_set_size(SLB_MIN_SIZE); 745 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", 746 smp_processor_id()); 747 data->error = rtas_call(data->token, 0, 1, NULL); 748 749 if (data->error) { 750 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", 751 data->error); 752 slb_set_size(slb_size); 753 } 754 } else { 755 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", 756 smp_processor_id(), rc); 757 data->error = rc; 758 } 759 760 atomic_set(&data->done, 1); 761 762 /* This cpu did the suspend or got an error; in either case, 763 * we need to prod all other other cpus out of join state. 764 * Extra prods are harmless. 765 */ 766 for_each_online_cpu(cpu) 767 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); 768 out: 769 if (atomic_dec_return(&data->working) == 0) 770 complete(data->complete); 771 } 772 773 static int rtas_ibm_suspend_me(struct rtas_args *args) 774 { 775 long state; 776 long rc; 777 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 778 struct rtas_suspend_me_data data; 779 DECLARE_COMPLETION_ONSTACK(done); 780 781 if (!rtas_service_present("ibm,suspend-me")) 782 return -ENOSYS; 783 784 /* Make sure the state is valid */ 785 rc = plpar_hcall(H_VASI_STATE, retbuf, 786 ((u64)args->args[0] << 32) | args->args[1]); 787 788 state = retbuf[0]; 789 790 if (rc) { 791 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); 792 return rc; 793 } else if (state == H_VASI_ENABLED) { 794 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; 795 return 0; 796 } else if (state != H_VASI_SUSPENDING) { 797 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", 798 state); 799 args->args[args->nargs] = -1; 800 return 0; 801 } 802 803 atomic_set(&data.working, 0); 804 atomic_set(&data.done, 0); 805 data.token = rtas_token("ibm,suspend-me"); 806 data.error = 0; 807 data.complete = &done; 808 809 /* Call function on all CPUs. One of us will make the 810 * rtas call 811 */ 812 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) 813 data.error = -EINVAL; 814 815 wait_for_completion(&done); 816 817 if (data.error != 0) 818 printk(KERN_ERR "Error doing global join\n"); 819 820 return data.error; 821 } 822 #else /* CONFIG_PPC_PSERIES */ 823 static int rtas_ibm_suspend_me(struct rtas_args *args) 824 { 825 return -ENOSYS; 826 } 827 #endif 828 829 asmlinkage int ppc_rtas(struct rtas_args __user *uargs) 830 { 831 struct rtas_args args; 832 unsigned long flags; 833 char *buff_copy, *errbuf = NULL; 834 int nargs; 835 int rc; 836 837 if (!capable(CAP_SYS_ADMIN)) 838 return -EPERM; 839 840 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) 841 return -EFAULT; 842 843 nargs = args.nargs; 844 if (nargs > ARRAY_SIZE(args.args) 845 || args.nret > ARRAY_SIZE(args.args) 846 || nargs + args.nret > ARRAY_SIZE(args.args)) 847 return -EINVAL; 848 849 /* Copy in args. */ 850 if (copy_from_user(args.args, uargs->args, 851 nargs * sizeof(rtas_arg_t)) != 0) 852 return -EFAULT; 853 854 if (args.token == RTAS_UNKNOWN_SERVICE) 855 return -EINVAL; 856 857 args.rets = &args.args[nargs]; 858 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); 859 860 /* Need to handle ibm,suspend_me call specially */ 861 if (args.token == ibm_suspend_me_token) { 862 rc = rtas_ibm_suspend_me(&args); 863 if (rc) 864 return rc; 865 goto copy_return; 866 } 867 868 buff_copy = get_errorlog_buffer(); 869 870 flags = lock_rtas(); 871 872 rtas.args = args; 873 enter_rtas(__pa(&rtas.args)); 874 args = rtas.args; 875 876 /* A -1 return code indicates that the last command couldn't 877 be completed due to a hardware error. */ 878 if (args.rets[0] == -1) 879 errbuf = __fetch_rtas_last_error(buff_copy); 880 881 unlock_rtas(flags); 882 883 if (buff_copy) { 884 if (errbuf) 885 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); 886 kfree(buff_copy); 887 } 888 889 copy_return: 890 /* Copy out args. */ 891 if (copy_to_user(uargs->args + nargs, 892 args.args + nargs, 893 args.nret * sizeof(rtas_arg_t)) != 0) 894 return -EFAULT; 895 896 return 0; 897 } 898 899 /* 900 * Call early during boot, before mem init or bootmem, to retrieve the RTAS 901 * informations from the device-tree and allocate the RMO buffer for userland 902 * accesses. 903 */ 904 void __init rtas_initialize(void) 905 { 906 unsigned long rtas_region = RTAS_INSTANTIATE_MAX; 907 908 /* Get RTAS dev node and fill up our "rtas" structure with infos 909 * about it. 910 */ 911 rtas.dev = of_find_node_by_name(NULL, "rtas"); 912 if (rtas.dev) { 913 const u32 *basep, *entryp, *sizep; 914 915 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); 916 sizep = of_get_property(rtas.dev, "rtas-size", NULL); 917 if (basep != NULL && sizep != NULL) { 918 rtas.base = *basep; 919 rtas.size = *sizep; 920 entryp = of_get_property(rtas.dev, 921 "linux,rtas-entry", NULL); 922 if (entryp == NULL) /* Ugh */ 923 rtas.entry = rtas.base; 924 else 925 rtas.entry = *entryp; 926 } else 927 rtas.dev = NULL; 928 } 929 if (!rtas.dev) 930 return; 931 932 /* If RTAS was found, allocate the RMO buffer for it and look for 933 * the stop-self token if any 934 */ 935 #ifdef CONFIG_PPC64 936 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { 937 rtas_region = min(memblock.rmo_size, RTAS_INSTANTIATE_MAX); 938 ibm_suspend_me_token = rtas_token("ibm,suspend-me"); 939 } 940 #endif 941 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); 942 943 #ifdef CONFIG_RTAS_ERROR_LOGGING 944 rtas_last_error_token = rtas_token("rtas-last-error"); 945 #endif 946 } 947 948 int __init early_init_dt_scan_rtas(unsigned long node, 949 const char *uname, int depth, void *data) 950 { 951 u32 *basep, *entryp, *sizep; 952 953 if (depth != 1 || strcmp(uname, "rtas") != 0) 954 return 0; 955 956 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); 957 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); 958 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); 959 960 if (basep && entryp && sizep) { 961 rtas.base = *basep; 962 rtas.entry = *entryp; 963 rtas.size = *sizep; 964 } 965 966 #ifdef CONFIG_UDBG_RTAS_CONSOLE 967 basep = of_get_flat_dt_prop(node, "put-term-char", NULL); 968 if (basep) 969 rtas_putchar_token = *basep; 970 971 basep = of_get_flat_dt_prop(node, "get-term-char", NULL); 972 if (basep) 973 rtas_getchar_token = *basep; 974 975 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && 976 rtas_getchar_token != RTAS_UNKNOWN_SERVICE) 977 udbg_init_rtas_console(); 978 979 #endif 980 981 /* break now */ 982 return 1; 983 } 984 985 static arch_spinlock_t timebase_lock; 986 static u64 timebase = 0; 987 988 void __cpuinit rtas_give_timebase(void) 989 { 990 unsigned long flags; 991 992 local_irq_save(flags); 993 hard_irq_disable(); 994 arch_spin_lock(&timebase_lock); 995 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); 996 timebase = get_tb(); 997 arch_spin_unlock(&timebase_lock); 998 999 while (timebase) 1000 barrier(); 1001 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); 1002 local_irq_restore(flags); 1003 } 1004 1005 void __cpuinit rtas_take_timebase(void) 1006 { 1007 while (!timebase) 1008 barrier(); 1009 arch_spin_lock(&timebase_lock); 1010 set_tb(timebase >> 32, timebase & 0xffffffff); 1011 timebase = 0; 1012 arch_spin_unlock(&timebase_lock); 1013 } 1014