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 47struct rtas_t rtas = { 48 .lock = __ARCH_SPIN_LOCK_UNLOCKED 49}; 50EXPORT_SYMBOL(rtas); 51 52DEFINE_SPINLOCK(rtas_data_buf_lock); 53EXPORT_SYMBOL(rtas_data_buf_lock); 54 55char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; 56EXPORT_SYMBOL(rtas_data_buf); 57 58unsigned 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 */ 64void (*rtas_flash_term_hook)(int); 65EXPORT_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 */ 72static 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 82static 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 */ 94static 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 114static 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 138void __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 */ 149static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; 150static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; 151 152static 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 171static 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 184static 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 195void __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 203void 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} 321EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ 322 323int 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} 331EXPORT_SYMBOL(rtas_token); 332 333int rtas_service_present(const char *service) 334{ 335 return rtas_token(service) != RTAS_UNKNOWN_SERVICE; 336} 337EXPORT_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 */ 345int 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} 360EXPORT_SYMBOL(rtas_get_error_log_max); 361 362 363static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; 364static 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 */ 372static 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 421int 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} 469EXPORT_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 */ 474unsigned 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 >= 9900 && status <= 9905) { 482 order = status - 9900; 483 for (ms = 1; order > 0; order--) 484 ms *= 10; 485 } 486 487 return ms; 488} 489EXPORT_SYMBOL(rtas_busy_delay_time); 490 491/* For an RTAS busy status code, perform the hinted delay. */ 492unsigned int rtas_busy_delay(int status) 493{ 494 unsigned int ms; 495 496 might_sleep(); 497 ms = rtas_busy_delay_time(status); 498 if (ms && need_resched()) 499 msleep(ms); 500 501 return ms; 502} 503EXPORT_SYMBOL(rtas_busy_delay); 504 505static int rtas_error_rc(int rtas_rc) 506{ 507 int rc; 508 509 switch (rtas_rc) { 510 case -1: /* Hardware Error */ 511 rc = -EIO; 512 break; 513 case -3: /* Bad indicator/domain/etc */ 514 rc = -EINVAL; 515 break; 516 case -9000: /* Isolation error */ 517 rc = -EFAULT; 518 break; 519 case -9001: /* Outstanding TCE/PTE */ 520 rc = -EEXIST; 521 break; 522 case -9002: /* No usable slot */ 523 rc = -ENODEV; 524 break; 525 default: 526 printk(KERN_ERR "%s: unexpected RTAS error %d\n", 527 __func__, rtas_rc); 528 rc = -ERANGE; 529 break; 530 } 531 return rc; 532} 533 534int rtas_get_power_level(int powerdomain, int *level) 535{ 536 int token = rtas_token("get-power-level"); 537 int rc; 538 539 if (token == RTAS_UNKNOWN_SERVICE) 540 return -ENOENT; 541 542 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) 543 udelay(1); 544 545 if (rc < 0) 546 return rtas_error_rc(rc); 547 return rc; 548} 549EXPORT_SYMBOL(rtas_get_power_level); 550 551int rtas_set_power_level(int powerdomain, int level, int *setlevel) 552{ 553 int token = rtas_token("set-power-level"); 554 int rc; 555 556 if (token == RTAS_UNKNOWN_SERVICE) 557 return -ENOENT; 558 559 do { 560 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); 561 } while (rtas_busy_delay(rc)); 562 563 if (rc < 0) 564 return rtas_error_rc(rc); 565 return rc; 566} 567EXPORT_SYMBOL(rtas_set_power_level); 568 569int rtas_get_sensor(int sensor, int index, int *state) 570{ 571 int token = rtas_token("get-sensor-state"); 572 int rc; 573 574 if (token == RTAS_UNKNOWN_SERVICE) 575 return -ENOENT; 576 577 do { 578 rc = rtas_call(token, 2, 2, state, sensor, index); 579 } while (rtas_busy_delay(rc)); 580 581 if (rc < 0) 582 return rtas_error_rc(rc); 583 return rc; 584} 585EXPORT_SYMBOL(rtas_get_sensor); 586 587int rtas_get_sensor_fast(int sensor, int index, int *state) 588{ 589 int token = rtas_token("get-sensor-state"); 590 int rc; 591 592 if (token == RTAS_UNKNOWN_SERVICE) 593 return -ENOENT; 594 595 rc = rtas_call(token, 2, 2, state, sensor, index); 596 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && 597 rc <= RTAS_EXTENDED_DELAY_MAX)); 598 599 if (rc < 0) 600 return rtas_error_rc(rc); 601 return rc; 602} 603 604bool rtas_indicator_present(int token, int *maxindex) 605{ 606 int proplen, count, i; 607 const struct indicator_elem { 608 __be32 token; 609 __be32 maxindex; 610 } *indicators; 611 612 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); 613 if (!indicators) 614 return false; 615 616 count = proplen / sizeof(struct indicator_elem); 617 618 for (i = 0; i < count; i++) { 619 if (__be32_to_cpu(indicators[i].token) != token) 620 continue; 621 if (maxindex) 622 *maxindex = __be32_to_cpu(indicators[i].maxindex); 623 return true; 624 } 625 626 return false; 627} 628EXPORT_SYMBOL(rtas_indicator_present); 629 630int rtas_set_indicator(int indicator, int index, int new_value) 631{ 632 int token = rtas_token("set-indicator"); 633 int rc; 634 635 if (token == RTAS_UNKNOWN_SERVICE) 636 return -ENOENT; 637 638 do { 639 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); 640 } while (rtas_busy_delay(rc)); 641 642 if (rc < 0) 643 return rtas_error_rc(rc); 644 return rc; 645} 646EXPORT_SYMBOL(rtas_set_indicator); 647 648/* 649 * Ignoring RTAS extended delay 650 */ 651int rtas_set_indicator_fast(int indicator, int index, int new_value) 652{ 653 int rc; 654 int token = rtas_token("set-indicator"); 655 656 if (token == RTAS_UNKNOWN_SERVICE) 657 return -ENOENT; 658 659 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); 660 661 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); 662 663 if (rc < 0) 664 return rtas_error_rc(rc); 665 666 return rc; 667} 668 669void rtas_restart(char *cmd) 670{ 671 if (rtas_flash_term_hook) 672 rtas_flash_term_hook(SYS_RESTART); 673 printk("RTAS system-reboot returned %d\n", 674 rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); 675 for (;;); 676} 677 678void rtas_power_off(void) 679{ 680 if (rtas_flash_term_hook) 681 rtas_flash_term_hook(SYS_POWER_OFF); 682 /* allow power on only with power button press */ 683 printk("RTAS power-off returned %d\n", 684 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); 685 for (;;); 686} 687 688void rtas_halt(void) 689{ 690 if (rtas_flash_term_hook) 691 rtas_flash_term_hook(SYS_HALT); 692 /* allow power on only with power button press */ 693 printk("RTAS power-off returned %d\n", 694 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); 695 for (;;); 696} 697 698/* Must be in the RMO region, so we place it here */ 699static char rtas_os_term_buf[2048]; 700 701void rtas_os_term(char *str) 702{ 703 int status; 704 705 /* 706 * Firmware with the ibm,extended-os-term property is guaranteed 707 * to always return from an ibm,os-term call. Earlier versions without 708 * this property may terminate the partition which we want to avoid 709 * since it interferes with panic_timeout. 710 */ 711 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || 712 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) 713 return; 714 715 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); 716 717 do { 718 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, 719 __pa(rtas_os_term_buf)); 720 } while (rtas_busy_delay(status)); 721 722 if (status != 0) 723 printk(KERN_EMERG "ibm,os-term call failed %d\n", status); 724} 725 726static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; 727#ifdef CONFIG_PPC_PSERIES 728static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) 729{ 730 u16 slb_size = mmu_slb_size; 731 int rc = H_MULTI_THREADS_ACTIVE; 732 int cpu; 733 734 slb_set_size(SLB_MIN_SIZE); 735 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); 736 737 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && 738 !atomic_read(&data->error)) 739 rc = rtas_call(data->token, 0, 1, NULL); 740 741 if (rc || atomic_read(&data->error)) { 742 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); 743 slb_set_size(slb_size); 744 } 745 746 if (atomic_read(&data->error)) 747 rc = atomic_read(&data->error); 748 749 atomic_set(&data->error, rc); 750 pSeries_coalesce_init(); 751 752 if (wake_when_done) { 753 atomic_set(&data->done, 1); 754 755 for_each_online_cpu(cpu) 756 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); 757 } 758 759 if (atomic_dec_return(&data->working) == 0) 760 complete(data->complete); 761 762 return rc; 763} 764 765int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) 766{ 767 atomic_inc(&data->working); 768 return __rtas_suspend_last_cpu(data, 0); 769} 770 771static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) 772{ 773 long rc = H_SUCCESS; 774 unsigned long msr_save; 775 int cpu; 776 777 atomic_inc(&data->working); 778 779 /* really need to ensure MSR.EE is off for H_JOIN */ 780 msr_save = mfmsr(); 781 mtmsr(msr_save & ~(MSR_EE)); 782 783 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) 784 rc = plpar_hcall_norets(H_JOIN); 785 786 mtmsr(msr_save); 787 788 if (rc == H_SUCCESS) { 789 /* This cpu was prodded and the suspend is complete. */ 790 goto out; 791 } else if (rc == H_CONTINUE) { 792 /* All other cpus are in H_JOIN, this cpu does 793 * the suspend. 794 */ 795 return __rtas_suspend_last_cpu(data, wake_when_done); 796 } else { 797 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", 798 smp_processor_id(), rc); 799 atomic_set(&data->error, rc); 800 } 801 802 if (wake_when_done) { 803 atomic_set(&data->done, 1); 804 805 /* This cpu did the suspend or got an error; in either case, 806 * we need to prod all other other cpus out of join state. 807 * Extra prods are harmless. 808 */ 809 for_each_online_cpu(cpu) 810 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); 811 } 812out: 813 if (atomic_dec_return(&data->working) == 0) 814 complete(data->complete); 815 return rc; 816} 817 818int rtas_suspend_cpu(struct rtas_suspend_me_data *data) 819{ 820 return __rtas_suspend_cpu(data, 0); 821} 822 823static void rtas_percpu_suspend_me(void *info) 824{ 825 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); 826} 827 828enum rtas_cpu_state { 829 DOWN, 830 UP, 831}; 832 833#ifndef CONFIG_SMP 834static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, 835 cpumask_var_t cpus) 836{ 837 if (!cpumask_empty(cpus)) { 838 cpumask_clear(cpus); 839 return -EINVAL; 840 } else 841 return 0; 842} 843#else 844/* On return cpumask will be altered to indicate CPUs changed. 845 * CPUs with states changed will be set in the mask, 846 * CPUs with status unchanged will be unset in the mask. */ 847static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, 848 cpumask_var_t cpus) 849{ 850 int cpu; 851 int cpuret = 0; 852 int ret = 0; 853 854 if (cpumask_empty(cpus)) 855 return 0; 856 857 for_each_cpu(cpu, cpus) { 858 switch (state) { 859 case DOWN: 860 cpuret = cpu_down(cpu); 861 break; 862 case UP: 863 cpuret = cpu_up(cpu); 864 break; 865 } 866 if (cpuret) { 867 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n", 868 __func__, 869 ((state == UP) ? "up" : "down"), 870 cpu, cpuret); 871 if (!ret) 872 ret = cpuret; 873 if (state == UP) { 874 /* clear bits for unchanged cpus, return */ 875 cpumask_shift_right(cpus, cpus, cpu); 876 cpumask_shift_left(cpus, cpus, cpu); 877 break; 878 } else { 879 /* clear bit for unchanged cpu, continue */ 880 cpumask_clear_cpu(cpu, cpus); 881 } 882 } 883 } 884 885 return ret; 886} 887#endif 888 889int rtas_online_cpus_mask(cpumask_var_t cpus) 890{ 891 int ret; 892 893 ret = rtas_cpu_state_change_mask(UP, cpus); 894 895 if (ret) { 896 cpumask_var_t tmp_mask; 897 898 if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY)) 899 return ret; 900 901 /* Use tmp_mask to preserve cpus mask from first failure */ 902 cpumask_copy(tmp_mask, cpus); 903 rtas_offline_cpus_mask(tmp_mask); 904 free_cpumask_var(tmp_mask); 905 } 906 907 return ret; 908} 909EXPORT_SYMBOL(rtas_online_cpus_mask); 910 911int rtas_offline_cpus_mask(cpumask_var_t cpus) 912{ 913 return rtas_cpu_state_change_mask(DOWN, cpus); 914} 915EXPORT_SYMBOL(rtas_offline_cpus_mask); 916 917int rtas_ibm_suspend_me(u64 handle) 918{ 919 long state; 920 long rc; 921 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 922 struct rtas_suspend_me_data data; 923 DECLARE_COMPLETION_ONSTACK(done); 924 cpumask_var_t offline_mask; 925 int cpuret; 926 927 if (!rtas_service_present("ibm,suspend-me")) 928 return -ENOSYS; 929 930 /* Make sure the state is valid */ 931 rc = plpar_hcall(H_VASI_STATE, retbuf, handle); 932 933 state = retbuf[0]; 934 935 if (rc) { 936 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); 937 return rc; 938 } else if (state == H_VASI_ENABLED) { 939 return -EAGAIN; 940 } else if (state != H_VASI_SUSPENDING) { 941 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", 942 state); 943 return -EIO; 944 } 945 946 if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY)) 947 return -ENOMEM; 948 949 atomic_set(&data.working, 0); 950 atomic_set(&data.done, 0); 951 atomic_set(&data.error, 0); 952 data.token = rtas_token("ibm,suspend-me"); 953 data.complete = &done; 954 955 /* All present CPUs must be online */ 956 cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask); 957 cpuret = rtas_online_cpus_mask(offline_mask); 958 if (cpuret) { 959 pr_err("%s: Could not bring present CPUs online.\n", __func__); 960 atomic_set(&data.error, cpuret); 961 goto out; 962 } 963 964 stop_topology_update(); 965 966 /* Call function on all CPUs. One of us will make the 967 * rtas call 968 */ 969 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) 970 atomic_set(&data.error, -EINVAL); 971 972 wait_for_completion(&done); 973 974 if (atomic_read(&data.error) != 0) 975 printk(KERN_ERR "Error doing global join\n"); 976 977 start_topology_update(); 978 979 /* Take down CPUs not online prior to suspend */ 980 cpuret = rtas_offline_cpus_mask(offline_mask); 981 if (cpuret) 982 pr_warn("%s: Could not restore CPUs to offline state.\n", 983 __func__); 984 985out: 986 free_cpumask_var(offline_mask); 987 return atomic_read(&data.error); 988} 989#else /* CONFIG_PPC_PSERIES */ 990int rtas_ibm_suspend_me(u64 handle) 991{ 992 return -ENOSYS; 993} 994#endif 995 996/** 997 * Find a specific pseries error log in an RTAS extended event log. 998 * @log: RTAS error/event log 999 * @section_id: two character section identifier 1000 * 1001 * Returns a pointer to the specified errorlog or NULL if not found. 1002 */ 1003struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, 1004 uint16_t section_id) 1005{ 1006 struct rtas_ext_event_log_v6 *ext_log = 1007 (struct rtas_ext_event_log_v6 *)log->buffer; 1008 struct pseries_errorlog *sect; 1009 unsigned char *p, *log_end; 1010 uint32_t ext_log_length = rtas_error_extended_log_length(log); 1011 uint8_t log_format = rtas_ext_event_log_format(ext_log); 1012 uint32_t company_id = rtas_ext_event_company_id(ext_log); 1013 1014 /* Check that we understand the format */ 1015 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) || 1016 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || 1017 company_id != RTAS_V6EXT_COMPANY_ID_IBM) 1018 return NULL; 1019 1020 log_end = log->buffer + ext_log_length; 1021 p = ext_log->vendor_log; 1022 1023 while (p < log_end) { 1024 sect = (struct pseries_errorlog *)p; 1025 if (pseries_errorlog_id(sect) == section_id) 1026 return sect; 1027 p += pseries_errorlog_length(sect); 1028 } 1029 1030 return NULL; 1031} 1032 1033/* We assume to be passed big endian arguments */ 1034asmlinkage int ppc_rtas(struct rtas_args __user *uargs) 1035{ 1036 struct rtas_args args; 1037 unsigned long flags; 1038 char *buff_copy, *errbuf = NULL; 1039 int nargs, nret, token; 1040 1041 if (!capable(CAP_SYS_ADMIN)) 1042 return -EPERM; 1043 1044 if (!rtas.entry) 1045 return -EINVAL; 1046 1047 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) 1048 return -EFAULT; 1049 1050 nargs = be32_to_cpu(args.nargs); 1051 nret = be32_to_cpu(args.nret); 1052 token = be32_to_cpu(args.token); 1053 1054 if (nargs > ARRAY_SIZE(args.args) 1055 || nret > ARRAY_SIZE(args.args) 1056 || nargs + nret > ARRAY_SIZE(args.args)) 1057 return -EINVAL; 1058 1059 /* Copy in args. */ 1060 if (copy_from_user(args.args, uargs->args, 1061 nargs * sizeof(rtas_arg_t)) != 0) 1062 return -EFAULT; 1063 1064 if (token == RTAS_UNKNOWN_SERVICE) 1065 return -EINVAL; 1066 1067 args.rets = &args.args[nargs]; 1068 memset(args.rets, 0, nret * sizeof(rtas_arg_t)); 1069 1070 /* Need to handle ibm,suspend_me call specially */ 1071 if (token == ibm_suspend_me_token) { 1072 1073 /* 1074 * rtas_ibm_suspend_me assumes the streamid handle is in cpu 1075 * endian, or at least the hcall within it requires it. 1076 */ 1077 int rc = 0; 1078 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32) 1079 | be32_to_cpu(args.args[1]); 1080 rc = rtas_ibm_suspend_me(handle); 1081 if (rc == -EAGAIN) 1082 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE); 1083 else if (rc == -EIO) 1084 args.rets[0] = cpu_to_be32(-1); 1085 else if (rc) 1086 return rc; 1087 goto copy_return; 1088 } 1089 1090 buff_copy = get_errorlog_buffer(); 1091 1092 flags = lock_rtas(); 1093 1094 rtas.args = args; 1095 enter_rtas(__pa(&rtas.args)); 1096 args = rtas.args; 1097 1098 /* A -1 return code indicates that the last command couldn't 1099 be completed due to a hardware error. */ 1100 if (be32_to_cpu(args.rets[0]) == -1) 1101 errbuf = __fetch_rtas_last_error(buff_copy); 1102 1103 unlock_rtas(flags); 1104 1105 if (buff_copy) { 1106 if (errbuf) 1107 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); 1108 kfree(buff_copy); 1109 } 1110 1111 copy_return: 1112 /* Copy out args. */ 1113 if (copy_to_user(uargs->args + nargs, 1114 args.args + nargs, 1115 nret * sizeof(rtas_arg_t)) != 0) 1116 return -EFAULT; 1117 1118 return 0; 1119} 1120 1121/* 1122 * Call early during boot, before mem init, to retrieve the RTAS 1123 * information from the device-tree and allocate the RMO buffer for userland 1124 * accesses. 1125 */ 1126void __init rtas_initialize(void) 1127{ 1128 unsigned long rtas_region = RTAS_INSTANTIATE_MAX; 1129 1130 /* Get RTAS dev node and fill up our "rtas" structure with infos 1131 * about it. 1132 */ 1133 rtas.dev = of_find_node_by_name(NULL, "rtas"); 1134 if (rtas.dev) { 1135 const __be32 *basep, *entryp, *sizep; 1136 1137 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); 1138 sizep = of_get_property(rtas.dev, "rtas-size", NULL); 1139 if (basep != NULL && sizep != NULL) { 1140 rtas.base = __be32_to_cpu(*basep); 1141 rtas.size = __be32_to_cpu(*sizep); 1142 entryp = of_get_property(rtas.dev, 1143 "linux,rtas-entry", NULL); 1144 if (entryp == NULL) /* Ugh */ 1145 rtas.entry = rtas.base; 1146 else 1147 rtas.entry = __be32_to_cpu(*entryp); 1148 } else 1149 rtas.dev = NULL; 1150 } 1151 if (!rtas.dev) 1152 return; 1153 1154 /* If RTAS was found, allocate the RMO buffer for it and look for 1155 * the stop-self token if any 1156 */ 1157#ifdef CONFIG_PPC64 1158 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { 1159 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); 1160 ibm_suspend_me_token = rtas_token("ibm,suspend-me"); 1161 } 1162#endif 1163 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); 1164 1165#ifdef CONFIG_RTAS_ERROR_LOGGING 1166 rtas_last_error_token = rtas_token("rtas-last-error"); 1167#endif 1168} 1169 1170int __init early_init_dt_scan_rtas(unsigned long node, 1171 const char *uname, int depth, void *data) 1172{ 1173 const u32 *basep, *entryp, *sizep; 1174 1175 if (depth != 1 || strcmp(uname, "rtas") != 0) 1176 return 0; 1177 1178 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); 1179 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); 1180 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); 1181 1182 if (basep && entryp && sizep) { 1183 rtas.base = *basep; 1184 rtas.entry = *entryp; 1185 rtas.size = *sizep; 1186 } 1187 1188#ifdef CONFIG_UDBG_RTAS_CONSOLE 1189 basep = of_get_flat_dt_prop(node, "put-term-char", NULL); 1190 if (basep) 1191 rtas_putchar_token = *basep; 1192 1193 basep = of_get_flat_dt_prop(node, "get-term-char", NULL); 1194 if (basep) 1195 rtas_getchar_token = *basep; 1196 1197 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && 1198 rtas_getchar_token != RTAS_UNKNOWN_SERVICE) 1199 udbg_init_rtas_console(); 1200 1201#endif 1202 1203 /* break now */ 1204 return 1; 1205} 1206 1207static arch_spinlock_t timebase_lock; 1208static u64 timebase = 0; 1209 1210void rtas_give_timebase(void) 1211{ 1212 unsigned long flags; 1213 1214 local_irq_save(flags); 1215 hard_irq_disable(); 1216 arch_spin_lock(&timebase_lock); 1217 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); 1218 timebase = get_tb(); 1219 arch_spin_unlock(&timebase_lock); 1220 1221 while (timebase) 1222 barrier(); 1223 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); 1224 local_irq_restore(flags); 1225} 1226 1227void rtas_take_timebase(void) 1228{ 1229 while (!timebase) 1230 barrier(); 1231 arch_spin_lock(&timebase_lock); 1232 set_tb(timebase >> 32, timebase & 0xffffffff); 1233 timebase = 0; 1234 arch_spin_unlock(&timebase_lock); 1235} 1236