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