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