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