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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Procedures for interfacing to the RTAS on CHRP machines.
5 *
6 * Peter Bergner, IBM March 2001.
7 * Copyright (C) 2001 IBM.
8 */
9
10#include <stdarg.h>
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/spinlock.h>
14#include <linux/export.h>
15#include <linux/init.h>
16#include <linux/capability.h>
17#include <linux/delay.h>
18#include <linux/cpu.h>
19#include <linux/sched.h>
20#include <linux/smp.h>
21#include <linux/completion.h>
22#include <linux/cpumask.h>
23#include <linux/memblock.h>
24#include <linux/slab.h>
25#include <linux/reboot.h>
26#include <linux/syscalls.h>
27
28#include <asm/interrupt.h>
29#include <asm/prom.h>
30#include <asm/rtas.h>
31#include <asm/hvcall.h>
32#include <asm/machdep.h>
33#include <asm/firmware.h>
34#include <asm/page.h>
35#include <asm/param.h>
36#include <asm/delay.h>
37#include <linux/uaccess.h>
38#include <asm/udbg.h>
39#include <asm/syscalls.h>
40#include <asm/smp.h>
41#include <linux/atomic.h>
42#include <asm/time.h>
43#include <asm/mmu.h>
44#include <asm/topology.h>
45#include <asm/paca.h>
46
47/* This is here deliberately so it's only used in this file */
48void enter_rtas(unsigned long);
49
50static inline void do_enter_rtas(unsigned long args)
51{
52 enter_rtas(args);
53
54 srr_regs_clobbered(); /* rtas uses SRRs, invalidate */
55}
56
57struct rtas_t rtas = {
58 .lock = __ARCH_SPIN_LOCK_UNLOCKED
59};
60EXPORT_SYMBOL(rtas);
61
62DEFINE_SPINLOCK(rtas_data_buf_lock);
63EXPORT_SYMBOL(rtas_data_buf_lock);
64
65char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
66EXPORT_SYMBOL(rtas_data_buf);
67
68unsigned long rtas_rmo_buf;
69
70/*
71 * If non-NULL, this gets called when the kernel terminates.
72 * This is done like this so rtas_flash can be a module.
73 */
74void (*rtas_flash_term_hook)(int);
75EXPORT_SYMBOL(rtas_flash_term_hook);
76
77/* RTAS use home made raw locking instead of spin_lock_irqsave
78 * because those can be called from within really nasty contexts
79 * such as having the timebase stopped which would lockup with
80 * normal locks and spinlock debugging enabled
81 */
82static unsigned long lock_rtas(void)
83{
84 unsigned long flags;
85
86 local_irq_save(flags);
87 preempt_disable();
88 arch_spin_lock(&rtas.lock);
89 return flags;
90}
91
92static void unlock_rtas(unsigned long flags)
93{
94 arch_spin_unlock(&rtas.lock);
95 local_irq_restore(flags);
96 preempt_enable();
97}
98
99/*
100 * call_rtas_display_status and call_rtas_display_status_delay
101 * are designed only for very early low-level debugging, which
102 * is why the token is hard-coded to 10.
103 */
104static void call_rtas_display_status(unsigned char c)
105{
106 unsigned long s;
107
108 if (!rtas.base)
109 return;
110
111 s = lock_rtas();
112 rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
113 unlock_rtas(s);
114}
115
116static void call_rtas_display_status_delay(char c)
117{
118 static int pending_newline = 0; /* did last write end with unprinted newline? */
119 static int width = 16;
120
121 if (c == '\n') {
122 while (width-- > 0)
123 call_rtas_display_status(' ');
124 width = 16;
125 mdelay(500);
126 pending_newline = 1;
127 } else {
128 if (pending_newline) {
129 call_rtas_display_status('\r');
130 call_rtas_display_status('\n');
131 }
132 pending_newline = 0;
133 if (width--) {
134 call_rtas_display_status(c);
135 udelay(10000);
136 }
137 }
138}
139
140void __init udbg_init_rtas_panel(void)
141{
142 udbg_putc = call_rtas_display_status_delay;
143}
144
145#ifdef CONFIG_UDBG_RTAS_CONSOLE
146
147/* If you think you're dying before early_init_dt_scan_rtas() does its
148 * work, you can hard code the token values for your firmware here and
149 * hardcode rtas.base/entry etc.
150 */
151static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
152static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
153
154static void udbg_rtascon_putc(char c)
155{
156 int tries;
157
158 if (!rtas.base)
159 return;
160
161 /* Add CRs before LFs */
162 if (c == '\n')
163 udbg_rtascon_putc('\r');
164
165 /* if there is more than one character to be displayed, wait a bit */
166 for (tries = 0; tries < 16; tries++) {
167 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
168 break;
169 udelay(1000);
170 }
171}
172
173static int udbg_rtascon_getc_poll(void)
174{
175 int c;
176
177 if (!rtas.base)
178 return -1;
179
180 if (rtas_call(rtas_getchar_token, 0, 2, &c))
181 return -1;
182
183 return c;
184}
185
186static int udbg_rtascon_getc(void)
187{
188 int c;
189
190 while ((c = udbg_rtascon_getc_poll()) == -1)
191 ;
192
193 return c;
194}
195
196
197void __init udbg_init_rtas_console(void)
198{
199 udbg_putc = udbg_rtascon_putc;
200 udbg_getc = udbg_rtascon_getc;
201 udbg_getc_poll = udbg_rtascon_getc_poll;
202}
203#endif /* CONFIG_UDBG_RTAS_CONSOLE */
204
205void rtas_progress(char *s, unsigned short hex)
206{
207 struct device_node *root;
208 int width;
209 const __be32 *p;
210 char *os;
211 static int display_character, set_indicator;
212 static int display_width, display_lines, form_feed;
213 static const int *row_width;
214 static DEFINE_SPINLOCK(progress_lock);
215 static int current_line;
216 static int pending_newline = 0; /* did last write end with unprinted newline? */
217
218 if (!rtas.base)
219 return;
220
221 if (display_width == 0) {
222 display_width = 0x10;
223 if ((root = of_find_node_by_path("/rtas"))) {
224 if ((p = of_get_property(root,
225 "ibm,display-line-length", NULL)))
226 display_width = be32_to_cpu(*p);
227 if ((p = of_get_property(root,
228 "ibm,form-feed", NULL)))
229 form_feed = be32_to_cpu(*p);
230 if ((p = of_get_property(root,
231 "ibm,display-number-of-lines", NULL)))
232 display_lines = be32_to_cpu(*p);
233 row_width = of_get_property(root,
234 "ibm,display-truncation-length", NULL);
235 of_node_put(root);
236 }
237 display_character = rtas_token("display-character");
238 set_indicator = rtas_token("set-indicator");
239 }
240
241 if (display_character == RTAS_UNKNOWN_SERVICE) {
242 /* use hex display if available */
243 if (set_indicator != RTAS_UNKNOWN_SERVICE)
244 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
245 return;
246 }
247
248 spin_lock(&progress_lock);
249
250 /*
251 * Last write ended with newline, but we didn't print it since
252 * it would just clear the bottom line of output. Print it now
253 * instead.
254 *
255 * If no newline is pending and form feed is supported, clear the
256 * display with a form feed; otherwise, print a CR to start output
257 * at the beginning of the line.
258 */
259 if (pending_newline) {
260 rtas_call(display_character, 1, 1, NULL, '\r');
261 rtas_call(display_character, 1, 1, NULL, '\n');
262 pending_newline = 0;
263 } else {
264 current_line = 0;
265 if (form_feed)
266 rtas_call(display_character, 1, 1, NULL,
267 (char)form_feed);
268 else
269 rtas_call(display_character, 1, 1, NULL, '\r');
270 }
271
272 if (row_width)
273 width = row_width[current_line];
274 else
275 width = display_width;
276 os = s;
277 while (*os) {
278 if (*os == '\n' || *os == '\r') {
279 /* If newline is the last character, save it
280 * until next call to avoid bumping up the
281 * display output.
282 */
283 if (*os == '\n' && !os[1]) {
284 pending_newline = 1;
285 current_line++;
286 if (current_line > display_lines-1)
287 current_line = display_lines-1;
288 spin_unlock(&progress_lock);
289 return;
290 }
291
292 /* RTAS wants CR-LF, not just LF */
293
294 if (*os == '\n') {
295 rtas_call(display_character, 1, 1, NULL, '\r');
296 rtas_call(display_character, 1, 1, NULL, '\n');
297 } else {
298 /* CR might be used to re-draw a line, so we'll
299 * leave it alone and not add LF.
300 */
301 rtas_call(display_character, 1, 1, NULL, *os);
302 }
303
304 if (row_width)
305 width = row_width[current_line];
306 else
307 width = display_width;
308 } else {
309 width--;
310 rtas_call(display_character, 1, 1, NULL, *os);
311 }
312
313 os++;
314
315 /* if we overwrite the screen length */
316 if (width <= 0)
317 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
318 os++;
319 }
320
321 spin_unlock(&progress_lock);
322}
323EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
324
325int rtas_token(const char *service)
326{
327 const __be32 *tokp;
328 if (rtas.dev == NULL)
329 return RTAS_UNKNOWN_SERVICE;
330 tokp = of_get_property(rtas.dev, service, NULL);
331 return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;
332}
333EXPORT_SYMBOL(rtas_token);
334
335int rtas_service_present(const char *service)
336{
337 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
338}
339EXPORT_SYMBOL(rtas_service_present);
340
341#ifdef CONFIG_RTAS_ERROR_LOGGING
342/*
343 * Return the firmware-specified size of the error log buffer
344 * for all rtas calls that require an error buffer argument.
345 * This includes 'check-exception' and 'rtas-last-error'.
346 */
347int rtas_get_error_log_max(void)
348{
349 static int rtas_error_log_max;
350 if (rtas_error_log_max)
351 return rtas_error_log_max;
352
353 rtas_error_log_max = rtas_token ("rtas-error-log-max");
354 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
355 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
356 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
357 rtas_error_log_max);
358 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
359 }
360 return rtas_error_log_max;
361}
362EXPORT_SYMBOL(rtas_get_error_log_max);
363
364
365static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
366static int rtas_last_error_token;
367
368/** Return a copy of the detailed error text associated with the
369 * most recent failed call to rtas. Because the error text
370 * might go stale if there are any other intervening rtas calls,
371 * this routine must be called atomically with whatever produced
372 * the error (i.e. with rtas.lock still held from the previous call).
373 */
374static char *__fetch_rtas_last_error(char *altbuf)
375{
376 struct rtas_args err_args, save_args;
377 u32 bufsz;
378 char *buf = NULL;
379
380 if (rtas_last_error_token == -1)
381 return NULL;
382
383 bufsz = rtas_get_error_log_max();
384
385 err_args.token = cpu_to_be32(rtas_last_error_token);
386 err_args.nargs = cpu_to_be32(2);
387 err_args.nret = cpu_to_be32(1);
388 err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf));
389 err_args.args[1] = cpu_to_be32(bufsz);
390 err_args.args[2] = 0;
391
392 save_args = rtas.args;
393 rtas.args = err_args;
394
395 do_enter_rtas(__pa(&rtas.args));
396
397 err_args = rtas.args;
398 rtas.args = save_args;
399
400 /* Log the error in the unlikely case that there was one. */
401 if (unlikely(err_args.args[2] == 0)) {
402 if (altbuf) {
403 buf = altbuf;
404 } else {
405 buf = rtas_err_buf;
406 if (slab_is_available())
407 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
408 }
409 if (buf)
410 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
411 }
412
413 return buf;
414}
415
416#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
417
418#else /* CONFIG_RTAS_ERROR_LOGGING */
419#define __fetch_rtas_last_error(x) NULL
420#define get_errorlog_buffer() NULL
421#endif
422
423
424static void
425va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
426 va_list list)
427{
428 int i;
429
430 args->token = cpu_to_be32(token);
431 args->nargs = cpu_to_be32(nargs);
432 args->nret = cpu_to_be32(nret);
433 args->rets = &(args->args[nargs]);
434
435 for (i = 0; i < nargs; ++i)
436 args->args[i] = cpu_to_be32(va_arg(list, __u32));
437
438 for (i = 0; i < nret; ++i)
439 args->rets[i] = 0;
440
441 do_enter_rtas(__pa(args));
442}
443
444void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
445{
446 va_list list;
447
448 va_start(list, nret);
449 va_rtas_call_unlocked(args, token, nargs, nret, list);
450 va_end(list);
451}
452
453int rtas_call(int token, int nargs, int nret, int *outputs, ...)
454{
455 va_list list;
456 int i;
457 unsigned long s;
458 struct rtas_args *rtas_args;
459 char *buff_copy = NULL;
460 int ret;
461
462 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
463 return -1;
464
465 s = lock_rtas();
466
467 /* We use the global rtas args buffer */
468 rtas_args = &rtas.args;
469
470 va_start(list, outputs);
471 va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
472 va_end(list);
473
474 /* A -1 return code indicates that the last command couldn't
475 be completed due to a hardware error. */
476 if (be32_to_cpu(rtas_args->rets[0]) == -1)
477 buff_copy = __fetch_rtas_last_error(NULL);
478
479 if (nret > 1 && outputs != NULL)
480 for (i = 0; i < nret-1; ++i)
481 outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);
482 ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;
483
484 unlock_rtas(s);
485
486 if (buff_copy) {
487 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
488 if (slab_is_available())
489 kfree(buff_copy);
490 }
491 return ret;
492}
493EXPORT_SYMBOL(rtas_call);
494
495/* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
496 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
497 */
498unsigned int rtas_busy_delay_time(int status)
499{
500 int order;
501 unsigned int ms = 0;
502
503 if (status == RTAS_BUSY) {
504 ms = 1;
505 } else if (status >= RTAS_EXTENDED_DELAY_MIN &&
506 status <= RTAS_EXTENDED_DELAY_MAX) {
507 order = status - RTAS_EXTENDED_DELAY_MIN;
508 for (ms = 1; order > 0; order--)
509 ms *= 10;
510 }
511
512 return ms;
513}
514EXPORT_SYMBOL(rtas_busy_delay_time);
515
516/* For an RTAS busy status code, perform the hinted delay. */
517unsigned int rtas_busy_delay(int status)
518{
519 unsigned int ms;
520
521 might_sleep();
522 ms = rtas_busy_delay_time(status);
523 if (ms && need_resched())
524 msleep(ms);
525
526 return ms;
527}
528EXPORT_SYMBOL(rtas_busy_delay);
529
530static int rtas_error_rc(int rtas_rc)
531{
532 int rc;
533
534 switch (rtas_rc) {
535 case -1: /* Hardware Error */
536 rc = -EIO;
537 break;
538 case -3: /* Bad indicator/domain/etc */
539 rc = -EINVAL;
540 break;
541 case -9000: /* Isolation error */
542 rc = -EFAULT;
543 break;
544 case -9001: /* Outstanding TCE/PTE */
545 rc = -EEXIST;
546 break;
547 case -9002: /* No usable slot */
548 rc = -ENODEV;
549 break;
550 default:
551 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
552 __func__, rtas_rc);
553 rc = -ERANGE;
554 break;
555 }
556 return rc;
557}
558
559int rtas_get_power_level(int powerdomain, int *level)
560{
561 int token = rtas_token("get-power-level");
562 int rc;
563
564 if (token == RTAS_UNKNOWN_SERVICE)
565 return -ENOENT;
566
567 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
568 udelay(1);
569
570 if (rc < 0)
571 return rtas_error_rc(rc);
572 return rc;
573}
574EXPORT_SYMBOL(rtas_get_power_level);
575
576int rtas_set_power_level(int powerdomain, int level, int *setlevel)
577{
578 int token = rtas_token("set-power-level");
579 int rc;
580
581 if (token == RTAS_UNKNOWN_SERVICE)
582 return -ENOENT;
583
584 do {
585 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
586 } while (rtas_busy_delay(rc));
587
588 if (rc < 0)
589 return rtas_error_rc(rc);
590 return rc;
591}
592EXPORT_SYMBOL(rtas_set_power_level);
593
594int rtas_get_sensor(int sensor, int index, int *state)
595{
596 int token = rtas_token("get-sensor-state");
597 int rc;
598
599 if (token == RTAS_UNKNOWN_SERVICE)
600 return -ENOENT;
601
602 do {
603 rc = rtas_call(token, 2, 2, state, sensor, index);
604 } while (rtas_busy_delay(rc));
605
606 if (rc < 0)
607 return rtas_error_rc(rc);
608 return rc;
609}
610EXPORT_SYMBOL(rtas_get_sensor);
611
612int rtas_get_sensor_fast(int sensor, int index, int *state)
613{
614 int token = rtas_token("get-sensor-state");
615 int rc;
616
617 if (token == RTAS_UNKNOWN_SERVICE)
618 return -ENOENT;
619
620 rc = rtas_call(token, 2, 2, state, sensor, index);
621 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
622 rc <= RTAS_EXTENDED_DELAY_MAX));
623
624 if (rc < 0)
625 return rtas_error_rc(rc);
626 return rc;
627}
628
629bool rtas_indicator_present(int token, int *maxindex)
630{
631 int proplen, count, i;
632 const struct indicator_elem {
633 __be32 token;
634 __be32 maxindex;
635 } *indicators;
636
637 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
638 if (!indicators)
639 return false;
640
641 count = proplen / sizeof(struct indicator_elem);
642
643 for (i = 0; i < count; i++) {
644 if (__be32_to_cpu(indicators[i].token) != token)
645 continue;
646 if (maxindex)
647 *maxindex = __be32_to_cpu(indicators[i].maxindex);
648 return true;
649 }
650
651 return false;
652}
653EXPORT_SYMBOL(rtas_indicator_present);
654
655int rtas_set_indicator(int indicator, int index, int new_value)
656{
657 int token = rtas_token("set-indicator");
658 int rc;
659
660 if (token == RTAS_UNKNOWN_SERVICE)
661 return -ENOENT;
662
663 do {
664 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
665 } while (rtas_busy_delay(rc));
666
667 if (rc < 0)
668 return rtas_error_rc(rc);
669 return rc;
670}
671EXPORT_SYMBOL(rtas_set_indicator);
672
673/*
674 * Ignoring RTAS extended delay
675 */
676int rtas_set_indicator_fast(int indicator, int index, int new_value)
677{
678 int rc;
679 int token = rtas_token("set-indicator");
680
681 if (token == RTAS_UNKNOWN_SERVICE)
682 return -ENOENT;
683
684 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
685
686 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
687 rc <= RTAS_EXTENDED_DELAY_MAX));
688
689 if (rc < 0)
690 return rtas_error_rc(rc);
691
692 return rc;
693}
694
695/**
696 * rtas_ibm_suspend_me() - Call ibm,suspend-me to suspend the LPAR.
697 *
698 * @fw_status: RTAS call status will be placed here if not NULL.
699 *
700 * rtas_ibm_suspend_me() should be called only on a CPU which has
701 * received H_CONTINUE from the H_JOIN hcall. All other active CPUs
702 * should be waiting to return from H_JOIN.
703 *
704 * rtas_ibm_suspend_me() may suspend execution of the OS
705 * indefinitely. Callers should take appropriate measures upon return, such as
706 * resetting watchdog facilities.
707 *
708 * Callers may choose to retry this call if @fw_status is
709 * %RTAS_THREADS_ACTIVE.
710 *
711 * Return:
712 * 0 - The partition has resumed from suspend, possibly after
713 * migration to a different host.
714 * -ECANCELED - The operation was aborted.
715 * -EAGAIN - There were other CPUs not in H_JOIN at the time of the call.
716 * -EBUSY - Some other condition prevented the suspend from succeeding.
717 * -EIO - Hardware/platform error.
718 */
719int rtas_ibm_suspend_me(int *fw_status)
720{
721 int fwrc;
722 int ret;
723
724 fwrc = rtas_call(rtas_token("ibm,suspend-me"), 0, 1, NULL);
725
726 switch (fwrc) {
727 case 0:
728 ret = 0;
729 break;
730 case RTAS_SUSPEND_ABORTED:
731 ret = -ECANCELED;
732 break;
733 case RTAS_THREADS_ACTIVE:
734 ret = -EAGAIN;
735 break;
736 case RTAS_NOT_SUSPENDABLE:
737 case RTAS_OUTSTANDING_COPROC:
738 ret = -EBUSY;
739 break;
740 case -1:
741 default:
742 ret = -EIO;
743 break;
744 }
745
746 if (fw_status)
747 *fw_status = fwrc;
748
749 return ret;
750}
751
752void __noreturn rtas_restart(char *cmd)
753{
754 if (rtas_flash_term_hook)
755 rtas_flash_term_hook(SYS_RESTART);
756 printk("RTAS system-reboot returned %d\n",
757 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
758 for (;;);
759}
760
761void rtas_power_off(void)
762{
763 if (rtas_flash_term_hook)
764 rtas_flash_term_hook(SYS_POWER_OFF);
765 /* allow power on only with power button press */
766 printk("RTAS power-off returned %d\n",
767 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
768 for (;;);
769}
770
771void __noreturn rtas_halt(void)
772{
773 if (rtas_flash_term_hook)
774 rtas_flash_term_hook(SYS_HALT);
775 /* allow power on only with power button press */
776 printk("RTAS power-off returned %d\n",
777 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
778 for (;;);
779}
780
781/* Must be in the RMO region, so we place it here */
782static char rtas_os_term_buf[2048];
783
784void rtas_os_term(char *str)
785{
786 int status;
787
788 /*
789 * Firmware with the ibm,extended-os-term property is guaranteed
790 * to always return from an ibm,os-term call. Earlier versions without
791 * this property may terminate the partition which we want to avoid
792 * since it interferes with panic_timeout.
793 */
794 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
795 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
796 return;
797
798 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
799
800 do {
801 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
802 __pa(rtas_os_term_buf));
803 } while (rtas_busy_delay(status));
804
805 if (status != 0)
806 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
807}
808
809/**
810 * rtas_activate_firmware() - Activate a new version of firmware.
811 *
812 * Activate a new version of partition firmware. The OS must call this
813 * after resuming from a partition hibernation or migration in order
814 * to maintain the ability to perform live firmware updates. It's not
815 * catastrophic for this method to be absent or to fail; just log the
816 * condition in that case.
817 *
818 * Context: This function may sleep.
819 */
820void rtas_activate_firmware(void)
821{
822 int token;
823 int fwrc;
824
825 token = rtas_token("ibm,activate-firmware");
826 if (token == RTAS_UNKNOWN_SERVICE) {
827 pr_notice("ibm,activate-firmware method unavailable\n");
828 return;
829 }
830
831 do {
832 fwrc = rtas_call(token, 0, 1, NULL);
833 } while (rtas_busy_delay(fwrc));
834
835 if (fwrc)
836 pr_err("ibm,activate-firmware failed (%i)\n", fwrc);
837}
838
839#ifdef CONFIG_PPC_PSERIES
840/**
841 * rtas_call_reentrant() - Used for reentrant rtas calls
842 * @token: Token for desired reentrant RTAS call
843 * @nargs: Number of Input Parameters
844 * @nret: Number of Output Parameters
845 * @outputs: Array of outputs
846 * @...: Inputs for desired RTAS call
847 *
848 * According to LoPAR documentation, only "ibm,int-on", "ibm,int-off",
849 * "ibm,get-xive" and "ibm,set-xive" are currently reentrant.
850 * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
851 * PACA one instead.
852 *
853 * Return: -1 on error,
854 * First output value of RTAS call if (nret > 0),
855 * 0 otherwise,
856 */
857int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
858{
859 va_list list;
860 struct rtas_args *args;
861 unsigned long flags;
862 int i, ret = 0;
863
864 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
865 return -1;
866
867 local_irq_save(flags);
868 preempt_disable();
869
870 /* We use the per-cpu (PACA) rtas args buffer */
871 args = local_paca->rtas_args_reentrant;
872
873 va_start(list, outputs);
874 va_rtas_call_unlocked(args, token, nargs, nret, list);
875 va_end(list);
876
877 if (nret > 1 && outputs)
878 for (i = 0; i < nret - 1; ++i)
879 outputs[i] = be32_to_cpu(args->rets[i + 1]);
880
881 if (nret > 0)
882 ret = be32_to_cpu(args->rets[0]);
883
884 local_irq_restore(flags);
885 preempt_enable();
886
887 return ret;
888}
889
890#endif /* CONFIG_PPC_PSERIES */
891
892/**
893 * Find a specific pseries error log in an RTAS extended event log.
894 * @log: RTAS error/event log
895 * @section_id: two character section identifier
896 *
897 * Returns a pointer to the specified errorlog or NULL if not found.
898 */
899struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
900 uint16_t section_id)
901{
902 struct rtas_ext_event_log_v6 *ext_log =
903 (struct rtas_ext_event_log_v6 *)log->buffer;
904 struct pseries_errorlog *sect;
905 unsigned char *p, *log_end;
906 uint32_t ext_log_length = rtas_error_extended_log_length(log);
907 uint8_t log_format = rtas_ext_event_log_format(ext_log);
908 uint32_t company_id = rtas_ext_event_company_id(ext_log);
909
910 /* Check that we understand the format */
911 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
912 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
913 company_id != RTAS_V6EXT_COMPANY_ID_IBM)
914 return NULL;
915
916 log_end = log->buffer + ext_log_length;
917 p = ext_log->vendor_log;
918
919 while (p < log_end) {
920 sect = (struct pseries_errorlog *)p;
921 if (pseries_errorlog_id(sect) == section_id)
922 return sect;
923 p += pseries_errorlog_length(sect);
924 }
925
926 return NULL;
927}
928
929#ifdef CONFIG_PPC_RTAS_FILTER
930
931/*
932 * The sys_rtas syscall, as originally designed, allows root to pass
933 * arbitrary physical addresses to RTAS calls. A number of RTAS calls
934 * can be abused to write to arbitrary memory and do other things that
935 * are potentially harmful to system integrity, and thus should only
936 * be used inside the kernel and not exposed to userspace.
937 *
938 * All known legitimate users of the sys_rtas syscall will only ever
939 * pass addresses that fall within the RMO buffer, and use a known
940 * subset of RTAS calls.
941 *
942 * Accordingly, we filter RTAS requests to check that the call is
943 * permitted, and that provided pointers fall within the RMO buffer.
944 * The rtas_filters list contains an entry for each permitted call,
945 * with the indexes of the parameters which are expected to contain
946 * addresses and sizes of buffers allocated inside the RMO buffer.
947 */
948struct rtas_filter {
949 const char *name;
950 int token;
951 /* Indexes into the args buffer, -1 if not used */
952 int buf_idx1;
953 int size_idx1;
954 int buf_idx2;
955 int size_idx2;
956
957 int fixed_size;
958};
959
960static struct rtas_filter rtas_filters[] __ro_after_init = {
961 { "ibm,activate-firmware", -1, -1, -1, -1, -1 },
962 { "ibm,configure-connector", -1, 0, -1, 1, -1, 4096 }, /* Special cased */
963 { "display-character", -1, -1, -1, -1, -1 },
964 { "ibm,display-message", -1, 0, -1, -1, -1 },
965 { "ibm,errinjct", -1, 2, -1, -1, -1, 1024 },
966 { "ibm,close-errinjct", -1, -1, -1, -1, -1 },
967 { "ibm,open-errinjct", -1, -1, -1, -1, -1 },
968 { "ibm,get-config-addr-info2", -1, -1, -1, -1, -1 },
969 { "ibm,get-dynamic-sensor-state", -1, 1, -1, -1, -1 },
970 { "ibm,get-indices", -1, 2, 3, -1, -1 },
971 { "get-power-level", -1, -1, -1, -1, -1 },
972 { "get-sensor-state", -1, -1, -1, -1, -1 },
973 { "ibm,get-system-parameter", -1, 1, 2, -1, -1 },
974 { "get-time-of-day", -1, -1, -1, -1, -1 },
975 { "ibm,get-vpd", -1, 0, -1, 1, 2 },
976 { "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
977 { "ibm,platform-dump", -1, 4, 5, -1, -1 },
978 { "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
979 { "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
980 { "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
981 { "ibm,set-eeh-option", -1, -1, -1, -1, -1 },
982 { "set-indicator", -1, -1, -1, -1, -1 },
983 { "set-power-level", -1, -1, -1, -1, -1 },
984 { "set-time-for-power-on", -1, -1, -1, -1, -1 },
985 { "ibm,set-system-parameter", -1, 1, -1, -1, -1 },
986 { "set-time-of-day", -1, -1, -1, -1, -1 },
987#ifdef CONFIG_CPU_BIG_ENDIAN
988 { "ibm,suspend-me", -1, -1, -1, -1, -1 },
989 { "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 },
990 { "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
991#endif
992 { "ibm,physical-attestation", -1, 0, 1, -1, -1 },
993};
994
995static bool in_rmo_buf(u32 base, u32 end)
996{
997 return base >= rtas_rmo_buf &&
998 base < (rtas_rmo_buf + RTAS_USER_REGION_SIZE) &&
999 base <= end &&
1000 end >= rtas_rmo_buf &&
1001 end < (rtas_rmo_buf + RTAS_USER_REGION_SIZE);
1002}
1003
1004static bool block_rtas_call(int token, int nargs,
1005 struct rtas_args *args)
1006{
1007 int i;
1008
1009 for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) {
1010 struct rtas_filter *f = &rtas_filters[i];
1011 u32 base, size, end;
1012
1013 if (token != f->token)
1014 continue;
1015
1016 if (f->buf_idx1 != -1) {
1017 base = be32_to_cpu(args->args[f->buf_idx1]);
1018 if (f->size_idx1 != -1)
1019 size = be32_to_cpu(args->args[f->size_idx1]);
1020 else if (f->fixed_size)
1021 size = f->fixed_size;
1022 else
1023 size = 1;
1024
1025 end = base + size - 1;
1026 if (!in_rmo_buf(base, end))
1027 goto err;
1028 }
1029
1030 if (f->buf_idx2 != -1) {
1031 base = be32_to_cpu(args->args[f->buf_idx2]);
1032 if (f->size_idx2 != -1)
1033 size = be32_to_cpu(args->args[f->size_idx2]);
1034 else if (f->fixed_size)
1035 size = f->fixed_size;
1036 else
1037 size = 1;
1038 end = base + size - 1;
1039
1040 /*
1041 * Special case for ibm,configure-connector where the
1042 * address can be 0
1043 */
1044 if (!strcmp(f->name, "ibm,configure-connector") &&
1045 base == 0)
1046 return false;
1047
1048 if (!in_rmo_buf(base, end))
1049 goto err;
1050 }
1051
1052 return false;
1053 }
1054
1055err:
1056 pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");
1057 pr_err_ratelimited("sys_rtas: token=0x%x, nargs=%d (called by %s)\n",
1058 token, nargs, current->comm);
1059 return true;
1060}
1061
1062static void __init rtas_syscall_filter_init(void)
1063{
1064 unsigned int i;
1065
1066 for (i = 0; i < ARRAY_SIZE(rtas_filters); i++)
1067 rtas_filters[i].token = rtas_token(rtas_filters[i].name);
1068}
1069
1070#else
1071
1072static bool block_rtas_call(int token, int nargs,
1073 struct rtas_args *args)
1074{
1075 return false;
1076}
1077
1078static void __init rtas_syscall_filter_init(void)
1079{
1080}
1081
1082#endif /* CONFIG_PPC_RTAS_FILTER */
1083
1084/* We assume to be passed big endian arguments */
1085SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
1086{
1087 struct rtas_args args;
1088 unsigned long flags;
1089 char *buff_copy, *errbuf = NULL;
1090 int nargs, nret, token;
1091
1092 if (!capable(CAP_SYS_ADMIN))
1093 return -EPERM;
1094
1095 if (!rtas.entry)
1096 return -EINVAL;
1097
1098 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1099 return -EFAULT;
1100
1101 nargs = be32_to_cpu(args.nargs);
1102 nret = be32_to_cpu(args.nret);
1103 token = be32_to_cpu(args.token);
1104
1105 if (nargs >= ARRAY_SIZE(args.args)
1106 || nret > ARRAY_SIZE(args.args)
1107 || nargs + nret > ARRAY_SIZE(args.args))
1108 return -EINVAL;
1109
1110 /* Copy in args. */
1111 if (copy_from_user(args.args, uargs->args,
1112 nargs * sizeof(rtas_arg_t)) != 0)
1113 return -EFAULT;
1114
1115 if (token == RTAS_UNKNOWN_SERVICE)
1116 return -EINVAL;
1117
1118 args.rets = &args.args[nargs];
1119 memset(args.rets, 0, nret * sizeof(rtas_arg_t));
1120
1121 if (block_rtas_call(token, nargs, &args))
1122 return -EINVAL;
1123
1124 /* Need to handle ibm,suspend_me call specially */
1125 if (token == rtas_token("ibm,suspend-me")) {
1126
1127 /*
1128 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1129 * endian, or at least the hcall within it requires it.
1130 */
1131 int rc = 0;
1132 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
1133 | be32_to_cpu(args.args[1]);
1134 rc = rtas_syscall_dispatch_ibm_suspend_me(handle);
1135 if (rc == -EAGAIN)
1136 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
1137 else if (rc == -EIO)
1138 args.rets[0] = cpu_to_be32(-1);
1139 else if (rc)
1140 return rc;
1141 goto copy_return;
1142 }
1143
1144 buff_copy = get_errorlog_buffer();
1145
1146 flags = lock_rtas();
1147
1148 rtas.args = args;
1149 do_enter_rtas(__pa(&rtas.args));
1150 args = rtas.args;
1151
1152 /* A -1 return code indicates that the last command couldn't
1153 be completed due to a hardware error. */
1154 if (be32_to_cpu(args.rets[0]) == -1)
1155 errbuf = __fetch_rtas_last_error(buff_copy);
1156
1157 unlock_rtas(flags);
1158
1159 if (buff_copy) {
1160 if (errbuf)
1161 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1162 kfree(buff_copy);
1163 }
1164
1165 copy_return:
1166 /* Copy out args. */
1167 if (copy_to_user(uargs->args + nargs,
1168 args.args + nargs,
1169 nret * sizeof(rtas_arg_t)) != 0)
1170 return -EFAULT;
1171
1172 return 0;
1173}
1174
1175/*
1176 * Call early during boot, before mem init, to retrieve the RTAS
1177 * information from the device-tree and allocate the RMO buffer for userland
1178 * accesses.
1179 */
1180void __init rtas_initialize(void)
1181{
1182 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1183 u32 base, size, entry;
1184 int no_base, no_size, no_entry;
1185
1186 /* Get RTAS dev node and fill up our "rtas" structure with infos
1187 * about it.
1188 */
1189 rtas.dev = of_find_node_by_name(NULL, "rtas");
1190 if (!rtas.dev)
1191 return;
1192
1193 no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
1194 no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
1195 if (no_base || no_size) {
1196 of_node_put(rtas.dev);
1197 rtas.dev = NULL;
1198 return;
1199 }
1200
1201 rtas.base = base;
1202 rtas.size = size;
1203 no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);
1204 rtas.entry = no_entry ? rtas.base : entry;
1205
1206 /* If RTAS was found, allocate the RMO buffer for it and look for
1207 * the stop-self token if any
1208 */
1209#ifdef CONFIG_PPC64
1210 if (firmware_has_feature(FW_FEATURE_LPAR))
1211 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1212#endif
1213 rtas_rmo_buf = memblock_phys_alloc_range(RTAS_USER_REGION_SIZE, PAGE_SIZE,
1214 0, rtas_region);
1215 if (!rtas_rmo_buf)
1216 panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
1217 PAGE_SIZE, &rtas_region);
1218
1219#ifdef CONFIG_RTAS_ERROR_LOGGING
1220 rtas_last_error_token = rtas_token("rtas-last-error");
1221#endif
1222
1223 rtas_syscall_filter_init();
1224}
1225
1226int __init early_init_dt_scan_rtas(unsigned long node,
1227 const char *uname, int depth, void *data)
1228{
1229 const u32 *basep, *entryp, *sizep;
1230
1231 if (depth != 1 || strcmp(uname, "rtas") != 0)
1232 return 0;
1233
1234 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1235 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1236 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1237
1238 if (basep && entryp && sizep) {
1239 rtas.base = *basep;
1240 rtas.entry = *entryp;
1241 rtas.size = *sizep;
1242 }
1243
1244#ifdef CONFIG_UDBG_RTAS_CONSOLE
1245 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1246 if (basep)
1247 rtas_putchar_token = *basep;
1248
1249 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1250 if (basep)
1251 rtas_getchar_token = *basep;
1252
1253 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1254 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1255 udbg_init_rtas_console();
1256
1257#endif
1258
1259 /* break now */
1260 return 1;
1261}
1262
1263static arch_spinlock_t timebase_lock;
1264static u64 timebase = 0;
1265
1266void rtas_give_timebase(void)
1267{
1268 unsigned long flags;
1269
1270 local_irq_save(flags);
1271 hard_irq_disable();
1272 arch_spin_lock(&timebase_lock);
1273 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1274 timebase = get_tb();
1275 arch_spin_unlock(&timebase_lock);
1276
1277 while (timebase)
1278 barrier();
1279 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1280 local_irq_restore(flags);
1281}
1282
1283void rtas_take_timebase(void)
1284{
1285 while (!timebase)
1286 barrier();
1287 arch_spin_lock(&timebase_lock);
1288 set_tb(timebase >> 32, timebase & 0xffffffff);
1289 timebase = 0;
1290 arch_spin_unlock(&timebase_lock);
1291}
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#include <linux/reboot.h>
28
29#include <asm/prom.h>
30#include <asm/rtas.h>
31#include <asm/hvcall.h>
32#include <asm/machdep.h>
33#include <asm/firmware.h>
34#include <asm/page.h>
35#include <asm/param.h>
36#include <asm/system.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#include <asm/pSeries_reconfig.h>
47
48struct rtas_t rtas = {
49 .lock = __ARCH_SPIN_LOCK_UNLOCKED
50};
51EXPORT_SYMBOL(rtas);
52
53DEFINE_SPINLOCK(rtas_data_buf_lock);
54EXPORT_SYMBOL(rtas_data_buf_lock);
55
56char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
57EXPORT_SYMBOL(rtas_data_buf);
58
59unsigned long rtas_rmo_buf;
60
61/*
62 * If non-NULL, this gets called when the kernel terminates.
63 * This is done like this so rtas_flash can be a module.
64 */
65void (*rtas_flash_term_hook)(int);
66EXPORT_SYMBOL(rtas_flash_term_hook);
67
68/* RTAS use home made raw locking instead of spin_lock_irqsave
69 * because those can be called from within really nasty contexts
70 * such as having the timebase stopped which would lockup with
71 * normal locks and spinlock debugging enabled
72 */
73static unsigned long lock_rtas(void)
74{
75 unsigned long flags;
76
77 local_irq_save(flags);
78 preempt_disable();
79 arch_spin_lock_flags(&rtas.lock, flags);
80 return flags;
81}
82
83static void unlock_rtas(unsigned long flags)
84{
85 arch_spin_unlock(&rtas.lock);
86 local_irq_restore(flags);
87 preempt_enable();
88}
89
90/*
91 * call_rtas_display_status and call_rtas_display_status_delay
92 * are designed only for very early low-level debugging, which
93 * is why the token is hard-coded to 10.
94 */
95static void call_rtas_display_status(char c)
96{
97 struct rtas_args *args = &rtas.args;
98 unsigned long s;
99
100 if (!rtas.base)
101 return;
102 s = lock_rtas();
103
104 args->token = 10;
105 args->nargs = 1;
106 args->nret = 1;
107 args->rets = (rtas_arg_t *)&(args->args[1]);
108 args->args[0] = (unsigned char)c;
109
110 enter_rtas(__pa(args));
111
112 unlock_rtas(s);
113}
114
115static void call_rtas_display_status_delay(char c)
116{
117 static int pending_newline = 0; /* did last write end with unprinted newline? */
118 static int width = 16;
119
120 if (c == '\n') {
121 while (width-- > 0)
122 call_rtas_display_status(' ');
123 width = 16;
124 mdelay(500);
125 pending_newline = 1;
126 } else {
127 if (pending_newline) {
128 call_rtas_display_status('\r');
129 call_rtas_display_status('\n');
130 }
131 pending_newline = 0;
132 if (width--) {
133 call_rtas_display_status(c);
134 udelay(10000);
135 }
136 }
137}
138
139void __init udbg_init_rtas_panel(void)
140{
141 udbg_putc = call_rtas_display_status_delay;
142}
143
144#ifdef CONFIG_UDBG_RTAS_CONSOLE
145
146/* If you think you're dying before early_init_dt_scan_rtas() does its
147 * work, you can hard code the token values for your firmware here and
148 * hardcode rtas.base/entry etc.
149 */
150static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
151static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
152
153static void udbg_rtascon_putc(char c)
154{
155 int tries;
156
157 if (!rtas.base)
158 return;
159
160 /* Add CRs before LFs */
161 if (c == '\n')
162 udbg_rtascon_putc('\r');
163
164 /* if there is more than one character to be displayed, wait a bit */
165 for (tries = 0; tries < 16; tries++) {
166 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
167 break;
168 udelay(1000);
169 }
170}
171
172static int udbg_rtascon_getc_poll(void)
173{
174 int c;
175
176 if (!rtas.base)
177 return -1;
178
179 if (rtas_call(rtas_getchar_token, 0, 2, &c))
180 return -1;
181
182 return c;
183}
184
185static int udbg_rtascon_getc(void)
186{
187 int c;
188
189 while ((c = udbg_rtascon_getc_poll()) == -1)
190 ;
191
192 return c;
193}
194
195
196void __init udbg_init_rtas_console(void)
197{
198 udbg_putc = udbg_rtascon_putc;
199 udbg_getc = udbg_rtascon_getc;
200 udbg_getc_poll = udbg_rtascon_getc_poll;
201}
202#endif /* CONFIG_UDBG_RTAS_CONSOLE */
203
204void rtas_progress(char *s, unsigned short hex)
205{
206 struct device_node *root;
207 int width;
208 const int *p;
209 char *os;
210 static int display_character, set_indicator;
211 static int display_width, display_lines, form_feed;
212 static const int *row_width;
213 static DEFINE_SPINLOCK(progress_lock);
214 static int current_line;
215 static int pending_newline = 0; /* did last write end with unprinted newline? */
216
217 if (!rtas.base)
218 return;
219
220 if (display_width == 0) {
221 display_width = 0x10;
222 if ((root = of_find_node_by_path("/rtas"))) {
223 if ((p = of_get_property(root,
224 "ibm,display-line-length", NULL)))
225 display_width = *p;
226 if ((p = of_get_property(root,
227 "ibm,form-feed", NULL)))
228 form_feed = *p;
229 if ((p = of_get_property(root,
230 "ibm,display-number-of-lines", NULL)))
231 display_lines = *p;
232 row_width = of_get_property(root,
233 "ibm,display-truncation-length", NULL);
234 of_node_put(root);
235 }
236 display_character = rtas_token("display-character");
237 set_indicator = rtas_token("set-indicator");
238 }
239
240 if (display_character == RTAS_UNKNOWN_SERVICE) {
241 /* use hex display if available */
242 if (set_indicator != RTAS_UNKNOWN_SERVICE)
243 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
244 return;
245 }
246
247 spin_lock(&progress_lock);
248
249 /*
250 * Last write ended with newline, but we didn't print it since
251 * it would just clear the bottom line of output. Print it now
252 * instead.
253 *
254 * If no newline is pending and form feed is supported, clear the
255 * display with a form feed; otherwise, print a CR to start output
256 * at the beginning of the line.
257 */
258 if (pending_newline) {
259 rtas_call(display_character, 1, 1, NULL, '\r');
260 rtas_call(display_character, 1, 1, NULL, '\n');
261 pending_newline = 0;
262 } else {
263 current_line = 0;
264 if (form_feed)
265 rtas_call(display_character, 1, 1, NULL,
266 (char)form_feed);
267 else
268 rtas_call(display_character, 1, 1, NULL, '\r');
269 }
270
271 if (row_width)
272 width = row_width[current_line];
273 else
274 width = display_width;
275 os = s;
276 while (*os) {
277 if (*os == '\n' || *os == '\r') {
278 /* If newline is the last character, save it
279 * until next call to avoid bumping up the
280 * display output.
281 */
282 if (*os == '\n' && !os[1]) {
283 pending_newline = 1;
284 current_line++;
285 if (current_line > display_lines-1)
286 current_line = display_lines-1;
287 spin_unlock(&progress_lock);
288 return;
289 }
290
291 /* RTAS wants CR-LF, not just LF */
292
293 if (*os == '\n') {
294 rtas_call(display_character, 1, 1, NULL, '\r');
295 rtas_call(display_character, 1, 1, NULL, '\n');
296 } else {
297 /* CR might be used to re-draw a line, so we'll
298 * leave it alone and not add LF.
299 */
300 rtas_call(display_character, 1, 1, NULL, *os);
301 }
302
303 if (row_width)
304 width = row_width[current_line];
305 else
306 width = display_width;
307 } else {
308 width--;
309 rtas_call(display_character, 1, 1, NULL, *os);
310 }
311
312 os++;
313
314 /* if we overwrite the screen length */
315 if (width <= 0)
316 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
317 os++;
318 }
319
320 spin_unlock(&progress_lock);
321}
322EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
323
324int rtas_token(const char *service)
325{
326 const int *tokp;
327 if (rtas.dev == NULL)
328 return RTAS_UNKNOWN_SERVICE;
329 tokp = of_get_property(rtas.dev, service, NULL);
330 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
331}
332EXPORT_SYMBOL(rtas_token);
333
334int rtas_service_present(const char *service)
335{
336 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
337}
338EXPORT_SYMBOL(rtas_service_present);
339
340#ifdef CONFIG_RTAS_ERROR_LOGGING
341/*
342 * Return the firmware-specified size of the error log buffer
343 * for all rtas calls that require an error buffer argument.
344 * This includes 'check-exception' and 'rtas-last-error'.
345 */
346int rtas_get_error_log_max(void)
347{
348 static int rtas_error_log_max;
349 if (rtas_error_log_max)
350 return rtas_error_log_max;
351
352 rtas_error_log_max = rtas_token ("rtas-error-log-max");
353 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
354 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
355 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
356 rtas_error_log_max);
357 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
358 }
359 return rtas_error_log_max;
360}
361EXPORT_SYMBOL(rtas_get_error_log_max);
362
363
364static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
365static int rtas_last_error_token;
366
367/** Return a copy of the detailed error text associated with the
368 * most recent failed call to rtas. Because the error text
369 * might go stale if there are any other intervening rtas calls,
370 * this routine must be called atomically with whatever produced
371 * the error (i.e. with rtas.lock still held from the previous call).
372 */
373static char *__fetch_rtas_last_error(char *altbuf)
374{
375 struct rtas_args err_args, save_args;
376 u32 bufsz;
377 char *buf = NULL;
378
379 if (rtas_last_error_token == -1)
380 return NULL;
381
382 bufsz = rtas_get_error_log_max();
383
384 err_args.token = rtas_last_error_token;
385 err_args.nargs = 2;
386 err_args.nret = 1;
387 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
388 err_args.args[1] = bufsz;
389 err_args.args[2] = 0;
390
391 save_args = rtas.args;
392 rtas.args = err_args;
393
394 enter_rtas(__pa(&rtas.args));
395
396 err_args = rtas.args;
397 rtas.args = save_args;
398
399 /* Log the error in the unlikely case that there was one. */
400 if (unlikely(err_args.args[2] == 0)) {
401 if (altbuf) {
402 buf = altbuf;
403 } else {
404 buf = rtas_err_buf;
405 if (mem_init_done)
406 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
407 }
408 if (buf)
409 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
410 }
411
412 return buf;
413}
414
415#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
416
417#else /* CONFIG_RTAS_ERROR_LOGGING */
418#define __fetch_rtas_last_error(x) NULL
419#define get_errorlog_buffer() NULL
420#endif
421
422int rtas_call(int token, int nargs, int nret, int *outputs, ...)
423{
424 va_list list;
425 int i;
426 unsigned long s;
427 struct rtas_args *rtas_args;
428 char *buff_copy = NULL;
429 int ret;
430
431 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
432 return -1;
433
434 s = lock_rtas();
435 rtas_args = &rtas.args;
436
437 rtas_args->token = token;
438 rtas_args->nargs = nargs;
439 rtas_args->nret = nret;
440 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
441 va_start(list, outputs);
442 for (i = 0; i < nargs; ++i)
443 rtas_args->args[i] = va_arg(list, rtas_arg_t);
444 va_end(list);
445
446 for (i = 0; i < nret; ++i)
447 rtas_args->rets[i] = 0;
448
449 enter_rtas(__pa(rtas_args));
450
451 /* A -1 return code indicates that the last command couldn't
452 be completed due to a hardware error. */
453 if (rtas_args->rets[0] == -1)
454 buff_copy = __fetch_rtas_last_error(NULL);
455
456 if (nret > 1 && outputs != NULL)
457 for (i = 0; i < nret-1; ++i)
458 outputs[i] = rtas_args->rets[i+1];
459 ret = (nret > 0)? rtas_args->rets[0]: 0;
460
461 unlock_rtas(s);
462
463 if (buff_copy) {
464 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
465 if (mem_init_done)
466 kfree(buff_copy);
467 }
468 return ret;
469}
470EXPORT_SYMBOL(rtas_call);
471
472/* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
473 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
474 */
475unsigned int rtas_busy_delay_time(int status)
476{
477 int order;
478 unsigned int ms = 0;
479
480 if (status == RTAS_BUSY) {
481 ms = 1;
482 } else if (status >= 9900 && status <= 9905) {
483 order = status - 9900;
484 for (ms = 1; order > 0; order--)
485 ms *= 10;
486 }
487
488 return ms;
489}
490EXPORT_SYMBOL(rtas_busy_delay_time);
491
492/* For an RTAS busy status code, perform the hinted delay. */
493unsigned 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}
504EXPORT_SYMBOL(rtas_busy_delay);
505
506static 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
535int 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}
550EXPORT_SYMBOL(rtas_get_power_level);
551
552int 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}
568EXPORT_SYMBOL(rtas_set_power_level);
569
570int 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}
586EXPORT_SYMBOL(rtas_get_sensor);
587
588bool rtas_indicator_present(int token, int *maxindex)
589{
590 int proplen, count, i;
591 const struct indicator_elem {
592 u32 token;
593 u32 maxindex;
594 } *indicators;
595
596 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
597 if (!indicators)
598 return false;
599
600 count = proplen / sizeof(struct indicator_elem);
601
602 for (i = 0; i < count; i++) {
603 if (indicators[i].token != token)
604 continue;
605 if (maxindex)
606 *maxindex = indicators[i].maxindex;
607 return true;
608 }
609
610 return false;
611}
612EXPORT_SYMBOL(rtas_indicator_present);
613
614int rtas_set_indicator(int indicator, int index, int new_value)
615{
616 int token = rtas_token("set-indicator");
617 int rc;
618
619 if (token == RTAS_UNKNOWN_SERVICE)
620 return -ENOENT;
621
622 do {
623 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
624 } while (rtas_busy_delay(rc));
625
626 if (rc < 0)
627 return rtas_error_rc(rc);
628 return rc;
629}
630EXPORT_SYMBOL(rtas_set_indicator);
631
632/*
633 * Ignoring RTAS extended delay
634 */
635int rtas_set_indicator_fast(int indicator, int index, int new_value)
636{
637 int rc;
638 int token = rtas_token("set-indicator");
639
640 if (token == RTAS_UNKNOWN_SERVICE)
641 return -ENOENT;
642
643 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
644
645 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));
646
647 if (rc < 0)
648 return rtas_error_rc(rc);
649
650 return rc;
651}
652
653void rtas_restart(char *cmd)
654{
655 if (rtas_flash_term_hook)
656 rtas_flash_term_hook(SYS_RESTART);
657 printk("RTAS system-reboot returned %d\n",
658 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
659 for (;;);
660}
661
662void rtas_power_off(void)
663{
664 if (rtas_flash_term_hook)
665 rtas_flash_term_hook(SYS_POWER_OFF);
666 /* allow power on only with power button press */
667 printk("RTAS power-off returned %d\n",
668 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
669 for (;;);
670}
671
672void rtas_halt(void)
673{
674 if (rtas_flash_term_hook)
675 rtas_flash_term_hook(SYS_HALT);
676 /* allow power on only with power button press */
677 printk("RTAS power-off returned %d\n",
678 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
679 for (;;);
680}
681
682/* Must be in the RMO region, so we place it here */
683static char rtas_os_term_buf[2048];
684
685void rtas_os_term(char *str)
686{
687 int status;
688
689 /*
690 * Firmware with the ibm,extended-os-term property is guaranteed
691 * to always return from an ibm,os-term call. Earlier versions without
692 * this property may terminate the partition which we want to avoid
693 * since it interferes with panic_timeout.
694 */
695 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
696 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
697 return;
698
699 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
700
701 do {
702 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
703 __pa(rtas_os_term_buf));
704 } while (rtas_busy_delay(status));
705
706 if (status != 0)
707 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
708}
709
710static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
711#ifdef CONFIG_PPC_PSERIES
712static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
713{
714 u16 slb_size = mmu_slb_size;
715 int rc = H_MULTI_THREADS_ACTIVE;
716 int cpu;
717
718 slb_set_size(SLB_MIN_SIZE);
719 stop_topology_update();
720 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
721
722 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
723 !atomic_read(&data->error))
724 rc = rtas_call(data->token, 0, 1, NULL);
725
726 if (rc || atomic_read(&data->error)) {
727 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
728 slb_set_size(slb_size);
729 }
730
731 if (atomic_read(&data->error))
732 rc = atomic_read(&data->error);
733
734 atomic_set(&data->error, rc);
735 start_topology_update();
736 pSeries_coalesce_init();
737
738 if (wake_when_done) {
739 atomic_set(&data->done, 1);
740
741 for_each_online_cpu(cpu)
742 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
743 }
744
745 if (atomic_dec_return(&data->working) == 0)
746 complete(data->complete);
747
748 return rc;
749}
750
751int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
752{
753 atomic_inc(&data->working);
754 return __rtas_suspend_last_cpu(data, 0);
755}
756
757static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
758{
759 long rc = H_SUCCESS;
760 unsigned long msr_save;
761 int cpu;
762
763 atomic_inc(&data->working);
764
765 /* really need to ensure MSR.EE is off for H_JOIN */
766 msr_save = mfmsr();
767 mtmsr(msr_save & ~(MSR_EE));
768
769 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
770 rc = plpar_hcall_norets(H_JOIN);
771
772 mtmsr(msr_save);
773
774 if (rc == H_SUCCESS) {
775 /* This cpu was prodded and the suspend is complete. */
776 goto out;
777 } else if (rc == H_CONTINUE) {
778 /* All other cpus are in H_JOIN, this cpu does
779 * the suspend.
780 */
781 return __rtas_suspend_last_cpu(data, wake_when_done);
782 } else {
783 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
784 smp_processor_id(), rc);
785 atomic_set(&data->error, rc);
786 }
787
788 if (wake_when_done) {
789 atomic_set(&data->done, 1);
790
791 /* This cpu did the suspend or got an error; in either case,
792 * we need to prod all other other cpus out of join state.
793 * Extra prods are harmless.
794 */
795 for_each_online_cpu(cpu)
796 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
797 }
798out:
799 if (atomic_dec_return(&data->working) == 0)
800 complete(data->complete);
801 return rc;
802}
803
804int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
805{
806 return __rtas_suspend_cpu(data, 0);
807}
808
809static void rtas_percpu_suspend_me(void *info)
810{
811 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
812}
813
814int rtas_ibm_suspend_me(struct rtas_args *args)
815{
816 long state;
817 long rc;
818 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
819 struct rtas_suspend_me_data data;
820 DECLARE_COMPLETION_ONSTACK(done);
821
822 if (!rtas_service_present("ibm,suspend-me"))
823 return -ENOSYS;
824
825 /* Make sure the state is valid */
826 rc = plpar_hcall(H_VASI_STATE, retbuf,
827 ((u64)args->args[0] << 32) | args->args[1]);
828
829 state = retbuf[0];
830
831 if (rc) {
832 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
833 return rc;
834 } else if (state == H_VASI_ENABLED) {
835 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
836 return 0;
837 } else if (state != H_VASI_SUSPENDING) {
838 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
839 state);
840 args->args[args->nargs] = -1;
841 return 0;
842 }
843
844 atomic_set(&data.working, 0);
845 atomic_set(&data.done, 0);
846 atomic_set(&data.error, 0);
847 data.token = rtas_token("ibm,suspend-me");
848 data.complete = &done;
849
850 /* Call function on all CPUs. One of us will make the
851 * rtas call
852 */
853 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
854 atomic_set(&data.error, -EINVAL);
855
856 wait_for_completion(&done);
857
858 if (atomic_read(&data.error) != 0)
859 printk(KERN_ERR "Error doing global join\n");
860
861 return atomic_read(&data.error);
862}
863#else /* CONFIG_PPC_PSERIES */
864int rtas_ibm_suspend_me(struct rtas_args *args)
865{
866 return -ENOSYS;
867}
868#endif
869
870asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
871{
872 struct rtas_args args;
873 unsigned long flags;
874 char *buff_copy, *errbuf = NULL;
875 int nargs;
876 int rc;
877
878 if (!capable(CAP_SYS_ADMIN))
879 return -EPERM;
880
881 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
882 return -EFAULT;
883
884 nargs = args.nargs;
885 if (nargs > ARRAY_SIZE(args.args)
886 || args.nret > ARRAY_SIZE(args.args)
887 || nargs + args.nret > ARRAY_SIZE(args.args))
888 return -EINVAL;
889
890 /* Copy in args. */
891 if (copy_from_user(args.args, uargs->args,
892 nargs * sizeof(rtas_arg_t)) != 0)
893 return -EFAULT;
894
895 if (args.token == RTAS_UNKNOWN_SERVICE)
896 return -EINVAL;
897
898 args.rets = &args.args[nargs];
899 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
900
901 /* Need to handle ibm,suspend_me call specially */
902 if (args.token == ibm_suspend_me_token) {
903 rc = rtas_ibm_suspend_me(&args);
904 if (rc)
905 return rc;
906 goto copy_return;
907 }
908
909 buff_copy = get_errorlog_buffer();
910
911 flags = lock_rtas();
912
913 rtas.args = args;
914 enter_rtas(__pa(&rtas.args));
915 args = rtas.args;
916
917 /* A -1 return code indicates that the last command couldn't
918 be completed due to a hardware error. */
919 if (args.rets[0] == -1)
920 errbuf = __fetch_rtas_last_error(buff_copy);
921
922 unlock_rtas(flags);
923
924 if (buff_copy) {
925 if (errbuf)
926 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
927 kfree(buff_copy);
928 }
929
930 copy_return:
931 /* Copy out args. */
932 if (copy_to_user(uargs->args + nargs,
933 args.args + nargs,
934 args.nret * sizeof(rtas_arg_t)) != 0)
935 return -EFAULT;
936
937 return 0;
938}
939
940/*
941 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
942 * informations from the device-tree and allocate the RMO buffer for userland
943 * accesses.
944 */
945void __init rtas_initialize(void)
946{
947 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
948
949 /* Get RTAS dev node and fill up our "rtas" structure with infos
950 * about it.
951 */
952 rtas.dev = of_find_node_by_name(NULL, "rtas");
953 if (rtas.dev) {
954 const u32 *basep, *entryp, *sizep;
955
956 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
957 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
958 if (basep != NULL && sizep != NULL) {
959 rtas.base = *basep;
960 rtas.size = *sizep;
961 entryp = of_get_property(rtas.dev,
962 "linux,rtas-entry", NULL);
963 if (entryp == NULL) /* Ugh */
964 rtas.entry = rtas.base;
965 else
966 rtas.entry = *entryp;
967 } else
968 rtas.dev = NULL;
969 }
970 if (!rtas.dev)
971 return;
972
973 /* If RTAS was found, allocate the RMO buffer for it and look for
974 * the stop-self token if any
975 */
976#ifdef CONFIG_PPC64
977 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
978 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
979 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
980 }
981#endif
982 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
983
984#ifdef CONFIG_RTAS_ERROR_LOGGING
985 rtas_last_error_token = rtas_token("rtas-last-error");
986#endif
987}
988
989int __init early_init_dt_scan_rtas(unsigned long node,
990 const char *uname, int depth, void *data)
991{
992 u32 *basep, *entryp, *sizep;
993
994 if (depth != 1 || strcmp(uname, "rtas") != 0)
995 return 0;
996
997 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
998 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
999 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1000
1001 if (basep && entryp && sizep) {
1002 rtas.base = *basep;
1003 rtas.entry = *entryp;
1004 rtas.size = *sizep;
1005 }
1006
1007#ifdef CONFIG_UDBG_RTAS_CONSOLE
1008 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1009 if (basep)
1010 rtas_putchar_token = *basep;
1011
1012 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1013 if (basep)
1014 rtas_getchar_token = *basep;
1015
1016 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1017 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1018 udbg_init_rtas_console();
1019
1020#endif
1021
1022 /* break now */
1023 return 1;
1024}
1025
1026static arch_spinlock_t timebase_lock;
1027static u64 timebase = 0;
1028
1029void __cpuinit rtas_give_timebase(void)
1030{
1031 unsigned long flags;
1032
1033 local_irq_save(flags);
1034 hard_irq_disable();
1035 arch_spin_lock(&timebase_lock);
1036 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1037 timebase = get_tb();
1038 arch_spin_unlock(&timebase_lock);
1039
1040 while (timebase)
1041 barrier();
1042 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1043 local_irq_restore(flags);
1044}
1045
1046void __cpuinit rtas_take_timebase(void)
1047{
1048 while (!timebase)
1049 barrier();
1050 arch_spin_lock(&timebase_lock);
1051 set_tb(timebase >> 32, timebase & 0xffffffff);
1052 timebase = 0;
1053 arch_spin_unlock(&timebase_lock);
1054}