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generic: add __FINITDATA
[wrt350n-kernel.git] / arch / powerpc / kernel / rtas.c
blob52e95c2158c02418789d3e238b96b31ee42aa9d1
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
26 #include <asm/prom.h>
27 #include <asm/rtas.h>
28 #include <asm/hvcall.h>
29 #include <asm/semaphore.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/lmb.h>
38 #include <asm/udbg.h>
39 #include <asm/syscalls.h>
40 #include <asm/smp.h>
41 #include <asm/atomic.h>
42
43 struct rtas_t rtas = {
44 .lock = SPIN_LOCK_UNLOCKED
45 };
46 EXPORT_SYMBOL(rtas);
47
48 struct rtas_suspend_me_data {
49 atomic_t working; /* number of cpus accessing this struct */
50 int token; /* ibm,suspend-me */
51 int error;
52 struct completion *complete; /* wait on this until working == 0 */
53 };
54
55 DEFINE_SPINLOCK(rtas_data_buf_lock);
56 EXPORT_SYMBOL(rtas_data_buf_lock);
57
58 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
59 EXPORT_SYMBOL(rtas_data_buf);
60
61 unsigned 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 */
67 void (*rtas_flash_term_hook)(int);
68 EXPORT_SYMBOL(rtas_flash_term_hook);
69
70 /*
71 * call_rtas_display_status and call_rtas_display_status_delay
72 * are designed only for very early low-level debugging, which
73 * is why the token is hard-coded to 10.
74 */
75 static void call_rtas_display_status(char c)
76 {
77 struct rtas_args *args = &rtas.args;
78 unsigned long s;
79
80 if (!rtas.base)
81 return;
82 spin_lock_irqsave(&rtas.lock, s);
83
84 args->token = 10;
85 args->nargs = 1;
86 args->nret = 1;
87 args->rets = (rtas_arg_t *)&(args->args[1]);
88 args->args[0] = (unsigned char)c;
89
90 enter_rtas(__pa(args));
91
92 spin_unlock_irqrestore(&rtas.lock, s);
93 }
94
95 static void call_rtas_display_status_delay(char c)
96 {
97 static int pending_newline = 0; /* did last write end with unprinted newline? */
98 static int width = 16;
99
100 if (c == '\n') {
101 while (width-- > 0)
102 call_rtas_display_status(' ');
103 width = 16;
104 mdelay(500);
105 pending_newline = 1;
106 } else {
107 if (pending_newline) {
108 call_rtas_display_status('\r');
109 call_rtas_display_status('\n');
110 }
111 pending_newline = 0;
112 if (width--) {
113 call_rtas_display_status(c);
114 udelay(10000);
115 }
116 }
117 }
118
119 void __init udbg_init_rtas_panel(void)
120 {
121 udbg_putc = call_rtas_display_status_delay;
122 }
123
124 #ifdef CONFIG_UDBG_RTAS_CONSOLE
125
126 /* If you think you're dying before early_init_dt_scan_rtas() does its
127 * work, you can hard code the token values for your firmware here and
128 * hardcode rtas.base/entry etc.
129 */
130 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
131 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
132
133 static void udbg_rtascon_putc(char c)
134 {
135 int tries;
136
137 if (!rtas.base)
138 return;
139
140 /* Add CRs before LFs */
141 if (c == '\n')
142 udbg_rtascon_putc('\r');
143
144 /* if there is more than one character to be displayed, wait a bit */
145 for (tries = 0; tries < 16; tries++) {
146 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
147 break;
148 udelay(1000);
149 }
150 }
151
152 static int udbg_rtascon_getc_poll(void)
153 {
154 int c;
155
156 if (!rtas.base)
157 return -1;
158
159 if (rtas_call(rtas_getchar_token, 0, 2, &c))
160 return -1;
161
162 return c;
163 }
164
165 static int udbg_rtascon_getc(void)
166 {
167 int c;
168
169 while ((c = udbg_rtascon_getc_poll()) == -1)
170 ;
171
172 return c;
173 }
174
175
176 void __init udbg_init_rtas_console(void)
177 {
178 udbg_putc = udbg_rtascon_putc;
179 udbg_getc = udbg_rtascon_getc;
180 udbg_getc_poll = udbg_rtascon_getc_poll;
181 }
182 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
183
184 void rtas_progress(char *s, unsigned short hex)
185 {
186 struct device_node *root;
187 int width;
188 const int *p;
189 char *os;
190 static int display_character, set_indicator;
191 static int display_width, display_lines, form_feed;
192 static const int *row_width;
193 static DEFINE_SPINLOCK(progress_lock);
194 static int current_line;
195 static int pending_newline = 0; /* did last write end with unprinted newline? */
196
197 if (!rtas.base)
198 return;
199
200 if (display_width == 0) {
201 display_width = 0x10;
202 if ((root = of_find_node_by_path("/rtas"))) {
203 if ((p = of_get_property(root,
204 "ibm,display-line-length", NULL)))
205 display_width = *p;
206 if ((p = of_get_property(root,
207 "ibm,form-feed", NULL)))
208 form_feed = *p;
209 if ((p = of_get_property(root,
210 "ibm,display-number-of-lines", NULL)))
211 display_lines = *p;
212 row_width = of_get_property(root,
213 "ibm,display-truncation-length", NULL);
214 of_node_put(root);
215 }
216 display_character = rtas_token("display-character");
217 set_indicator = rtas_token("set-indicator");
218 }
219
220 if (display_character == RTAS_UNKNOWN_SERVICE) {
221 /* use hex display if available */
222 if (set_indicator != RTAS_UNKNOWN_SERVICE)
223 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
224 return;
225 }
226
227 spin_lock(&progress_lock);
228
229 /*
230 * Last write ended with newline, but we didn't print it since
231 * it would just clear the bottom line of output. Print it now
232 * instead.
233 *
234 * If no newline is pending and form feed is supported, clear the
235 * display with a form feed; otherwise, print a CR to start output
236 * at the beginning of the line.
237 */
238 if (pending_newline) {
239 rtas_call(display_character, 1, 1, NULL, '\r');
240 rtas_call(display_character, 1, 1, NULL, '\n');
241 pending_newline = 0;
242 } else {
243 current_line = 0;
244 if (form_feed)
245 rtas_call(display_character, 1, 1, NULL,
246 (char)form_feed);
247 else
248 rtas_call(display_character, 1, 1, NULL, '\r');
249 }
250
251 if (row_width)
252 width = row_width[current_line];
253 else
254 width = display_width;
255 os = s;
256 while (*os) {
257 if (*os == '\n' || *os == '\r') {
258 /* If newline is the last character, save it
259 * until next call to avoid bumping up the
260 * display output.
261 */
262 if (*os == '\n' && !os[1]) {
263 pending_newline = 1;
264 current_line++;
265 if (current_line > display_lines-1)
266 current_line = display_lines-1;
267 spin_unlock(&progress_lock);
268 return;
269 }
270
271 /* RTAS wants CR-LF, not just LF */
272
273 if (*os == '\n') {
274 rtas_call(display_character, 1, 1, NULL, '\r');
275 rtas_call(display_character, 1, 1, NULL, '\n');
276 } else {
277 /* CR might be used to re-draw a line, so we'll
278 * leave it alone and not add LF.
279 */
280 rtas_call(display_character, 1, 1, NULL, *os);
281 }
282
283 if (row_width)
284 width = row_width[current_line];
285 else
286 width = display_width;
287 } else {
288 width--;
289 rtas_call(display_character, 1, 1, NULL, *os);
290 }
291
292 os++;
293
294 /* if we overwrite the screen length */
295 if (width <= 0)
296 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
297 os++;
298 }
299
300 spin_unlock(&progress_lock);
301 }
302 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
303
304 int rtas_token(const char *service)
305 {
306 const int *tokp;
307 if (rtas.dev == NULL)
308 return RTAS_UNKNOWN_SERVICE;
309 tokp = of_get_property(rtas.dev, service, NULL);
310 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
311 }
312 EXPORT_SYMBOL(rtas_token);
313
314 int rtas_service_present(const char *service)
315 {
316 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
317 }
318 EXPORT_SYMBOL(rtas_service_present);
319
320 #ifdef CONFIG_RTAS_ERROR_LOGGING
321 /*
322 * Return the firmware-specified size of the error log buffer
323 * for all rtas calls that require an error buffer argument.
324 * This includes 'check-exception' and 'rtas-last-error'.
325 */
326 int rtas_get_error_log_max(void)
327 {
328 static int rtas_error_log_max;
329 if (rtas_error_log_max)
330 return rtas_error_log_max;
331
332 rtas_error_log_max = rtas_token ("rtas-error-log-max");
333 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
334 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
335 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
336 rtas_error_log_max);
337 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
338 }
339 return rtas_error_log_max;
340 }
341 EXPORT_SYMBOL(rtas_get_error_log_max);
342
343
344 char rtas_err_buf[RTAS_ERROR_LOG_MAX];
345 int rtas_last_error_token;
346
347 /** Return a copy of the detailed error text associated with the
348 * most recent failed call to rtas. Because the error text
349 * might go stale if there are any other intervening rtas calls,
350 * this routine must be called atomically with whatever produced
351 * the error (i.e. with rtas.lock still held from the previous call).
352 */
353 static char *__fetch_rtas_last_error(char *altbuf)
354 {
355 struct rtas_args err_args, save_args;
356 u32 bufsz;
357 char *buf = NULL;
358
359 if (rtas_last_error_token == -1)
360 return NULL;
361
362 bufsz = rtas_get_error_log_max();
363
364 err_args.token = rtas_last_error_token;
365 err_args.nargs = 2;
366 err_args.nret = 1;
367 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
368 err_args.args[1] = bufsz;
369 err_args.args[2] = 0;
370
371 save_args = rtas.args;
372 rtas.args = err_args;
373
374 enter_rtas(__pa(&rtas.args));
375
376 err_args = rtas.args;
377 rtas.args = save_args;
378
379 /* Log the error in the unlikely case that there was one. */
380 if (unlikely(err_args.args[2] == 0)) {
381 if (altbuf) {
382 buf = altbuf;
383 } else {
384 buf = rtas_err_buf;
385 if (mem_init_done)
386 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
387 }
388 if (buf)
389 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
390 }
391
392 return buf;
393 }
394
395 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
396
397 #else /* CONFIG_RTAS_ERROR_LOGGING */
398 #define __fetch_rtas_last_error(x) NULL
399 #define get_errorlog_buffer() NULL
400 #endif
401
402 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
403 {
404 va_list list;
405 int i;
406 unsigned long s;
407 struct rtas_args *rtas_args;
408 char *buff_copy = NULL;
409 int ret;
410
411 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
412 return -1;
413
414 /* Gotta do something different here, use global lock for now... */
415 spin_lock_irqsave(&rtas.lock, s);
416 rtas_args = &rtas.args;
417
418 rtas_args->token = token;
419 rtas_args->nargs = nargs;
420 rtas_args->nret = nret;
421 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
422 va_start(list, outputs);
423 for (i = 0; i < nargs; ++i)
424 rtas_args->args[i] = va_arg(list, rtas_arg_t);
425 va_end(list);
426
427 for (i = 0; i < nret; ++i)
428 rtas_args->rets[i] = 0;
429
430 enter_rtas(__pa(rtas_args));
431
432 /* A -1 return code indicates that the last command couldn't
433 be completed due to a hardware error. */
434 if (rtas_args->rets[0] == -1)
435 buff_copy = __fetch_rtas_last_error(NULL);
436
437 if (nret > 1 && outputs != NULL)
438 for (i = 0; i < nret-1; ++i)
439 outputs[i] = rtas_args->rets[i+1];
440 ret = (nret > 0)? rtas_args->rets[0]: 0;
441
442 /* Gotta do something different here, use global lock for now... */
443 spin_unlock_irqrestore(&rtas.lock, s);
444
445 if (buff_copy) {
446 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
447 if (mem_init_done)
448 kfree(buff_copy);
449 }
450 return ret;
451 }
452 EXPORT_SYMBOL(rtas_call);
453
454 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
455 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
456 */
457 unsigned int rtas_busy_delay_time(int status)
458 {
459 int order;
460 unsigned int ms = 0;
461
462 if (status == RTAS_BUSY) {
463 ms = 1;
464 } else if (status >= 9900 && status <= 9905) {
465 order = status - 9900;
466 for (ms = 1; order > 0; order--)
467 ms *= 10;
468 }
469
470 return ms;
471 }
472 EXPORT_SYMBOL(rtas_busy_delay_time);
473
474 /* For an RTAS busy status code, perform the hinted delay. */
475 unsigned int rtas_busy_delay(int status)
476 {
477 unsigned int ms;
478
479 might_sleep();
480 ms = rtas_busy_delay_time(status);
481 if (ms)
482 msleep(ms);
483
484 return ms;
485 }
486 EXPORT_SYMBOL(rtas_busy_delay);
487
488 int rtas_error_rc(int rtas_rc)
489 {
490 int rc;
491
492 switch (rtas_rc) {
493 case -1: /* Hardware Error */
494 rc = -EIO;
495 break;
496 case -3: /* Bad indicator/domain/etc */
497 rc = -EINVAL;
498 break;
499 case -9000: /* Isolation error */
500 rc = -EFAULT;
501 break;
502 case -9001: /* Outstanding TCE/PTE */
503 rc = -EEXIST;
504 break;
505 case -9002: /* No usable slot */
506 rc = -ENODEV;
507 break;
508 default:
509 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
510 __FUNCTION__, rtas_rc);
511 rc = -ERANGE;
512 break;
513 }
514 return rc;
515 }
516
517 int rtas_get_power_level(int powerdomain, int *level)
518 {
519 int token = rtas_token("get-power-level");
520 int rc;
521
522 if (token == RTAS_UNKNOWN_SERVICE)
523 return -ENOENT;
524
525 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
526 udelay(1);
527
528 if (rc < 0)
529 return rtas_error_rc(rc);
530 return rc;
531 }
532 EXPORT_SYMBOL(rtas_get_power_level);
533
534 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
535 {
536 int token = rtas_token("set-power-level");
537 int rc;
538
539 if (token == RTAS_UNKNOWN_SERVICE)
540 return -ENOENT;
541
542 do {
543 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
544 } while (rtas_busy_delay(rc));
545
546 if (rc < 0)
547 return rtas_error_rc(rc);
548 return rc;
549 }
550 EXPORT_SYMBOL(rtas_set_power_level);
551
552 int rtas_get_sensor(int sensor, int index, int *state)
553 {
554 int token = rtas_token("get-sensor-state");
555 int rc;
556
557 if (token == RTAS_UNKNOWN_SERVICE)
558 return -ENOENT;
559
560 do {
561 rc = rtas_call(token, 2, 2, state, sensor, index);
562 } while (rtas_busy_delay(rc));
563
564 if (rc < 0)
565 return rtas_error_rc(rc);
566 return rc;
567 }
568 EXPORT_SYMBOL(rtas_get_sensor);
569
570 int rtas_set_indicator(int indicator, int index, int new_value)
571 {
572 int token = rtas_token("set-indicator");
573 int rc;
574
575 if (token == RTAS_UNKNOWN_SERVICE)
576 return -ENOENT;
577
578 do {
579 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
580 } while (rtas_busy_delay(rc));
581
582 if (rc < 0)
583 return rtas_error_rc(rc);
584 return rc;
585 }
586 EXPORT_SYMBOL(rtas_set_indicator);
587
588 /*
589 * Ignoring RTAS extended delay
590 */
591 int rtas_set_indicator_fast(int indicator, int index, int new_value)
592 {
593 int rc;
594 int token = rtas_token("set-indicator");
595
596 if (token == RTAS_UNKNOWN_SERVICE)
597 return -ENOENT;
598
599 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
600
601 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));
602
603 if (rc < 0)
604 return rtas_error_rc(rc);
605
606 return rc;
607 }
608
609 void rtas_restart(char *cmd)
610 {
611 if (rtas_flash_term_hook)
612 rtas_flash_term_hook(SYS_RESTART);
613 printk("RTAS system-reboot returned %d\n",
614 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
615 for (;;);
616 }
617
618 void rtas_power_off(void)
619 {
620 if (rtas_flash_term_hook)
621 rtas_flash_term_hook(SYS_POWER_OFF);
622 /* allow power on only with power button press */
623 printk("RTAS power-off returned %d\n",
624 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
625 for (;;);
626 }
627
628 void rtas_halt(void)
629 {
630 if (rtas_flash_term_hook)
631 rtas_flash_term_hook(SYS_HALT);
632 /* allow power on only with power button press */
633 printk("RTAS power-off returned %d\n",
634 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
635 for (;;);
636 }
637
638 /* Must be in the RMO region, so we place it here */
639 static char rtas_os_term_buf[2048];
640
641 void rtas_os_term(char *str)
642 {
643 int status;
644
645 if (panic_timeout)
646 return;
647
648 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
649 return;
650
651 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
652
653 do {
654 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
655 __pa(rtas_os_term_buf));
656 } while (rtas_busy_delay(status));
657
658 if (status != 0)
659 printk(KERN_EMERG "ibm,os-term call failed %d\n",
660 status);
661 }
662
663 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
664 #ifdef CONFIG_PPC_PSERIES
665 static void rtas_percpu_suspend_me(void *info)
666 {
667 long rc;
668 unsigned long msr_save;
669 int cpu;
670 struct rtas_suspend_me_data *data =
671 (struct rtas_suspend_me_data *)info;
672
673 atomic_inc(&data->working);
674
675 /* really need to ensure MSR.EE is off for H_JOIN */
676 msr_save = mfmsr();
677 mtmsr(msr_save & ~(MSR_EE));
678
679 rc = plpar_hcall_norets(H_JOIN);
680
681 mtmsr(msr_save);
682
683 if (rc == H_SUCCESS) {
684 /* This cpu was prodded and the suspend is complete. */
685 goto out;
686 } else if (rc == H_CONTINUE) {
687 /* All other cpus are in H_JOIN, this cpu does
688 * the suspend.
689 */
690 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n",
691 smp_processor_id());
692 data->error = rtas_call(data->token, 0, 1, NULL);
693
694 if (data->error)
695 printk(KERN_DEBUG "ibm,suspend-me returned %d\n",
696 data->error);
697 } else {
698 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
699 smp_processor_id(), rc);
700 data->error = rc;
701 }
702 /* This cpu did the suspend or got an error; in either case,
703 * we need to prod all other other cpus out of join state.
704 * Extra prods are harmless.
705 */
706 for_each_online_cpu(cpu)
707 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
708 out:
709 if (atomic_dec_return(&data->working) == 0)
710 complete(data->complete);
711 }
712
713 static int rtas_ibm_suspend_me(struct rtas_args *args)
714 {
715 long state;
716 long rc;
717 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
718 struct rtas_suspend_me_data data;
719 DECLARE_COMPLETION_ONSTACK(done);
720
721 if (!rtas_service_present("ibm,suspend-me"))
722 return -ENOSYS;
723
724 /* Make sure the state is valid */
725 rc = plpar_hcall(H_VASI_STATE, retbuf,
726 ((u64)args->args[0] << 32) | args->args[1]);
727
728 state = retbuf[0];
729
730 if (rc) {
731 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
732 return rc;
733 } else if (state == H_VASI_ENABLED) {
734 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
735 return 0;
736 } else if (state != H_VASI_SUSPENDING) {
737 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
738 state);
739 args->args[args->nargs] = -1;
740 return 0;
741 }
742
743 atomic_set(&data.working, 0);
744 data.token = rtas_token("ibm,suspend-me");
745 data.error = 0;
746 data.complete = &done;
747
748 /* Call function on all CPUs. One of us will make the
749 * rtas call
750 */
751 if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0))
752 data.error = -EINVAL;
753
754 wait_for_completion(&done);
755
756 if (data.error != 0)
757 printk(KERN_ERR "Error doing global join\n");
758
759 return data.error;
760 }
761 #else /* CONFIG_PPC_PSERIES */
762 static int rtas_ibm_suspend_me(struct rtas_args *args)
763 {
764 return -ENOSYS;
765 }
766 #endif
767
768 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
769 {
770 struct rtas_args args;
771 unsigned long flags;
772 char *buff_copy, *errbuf = NULL;
773 int nargs;
774 int rc;
775
776 if (!capable(CAP_SYS_ADMIN))
777 return -EPERM;
778
779 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
780 return -EFAULT;
781
782 nargs = args.nargs;
783 if (nargs > ARRAY_SIZE(args.args)
784 || args.nret > ARRAY_SIZE(args.args)
785 || nargs + args.nret > ARRAY_SIZE(args.args))
786 return -EINVAL;
787
788 /* Copy in args. */
789 if (copy_from_user(args.args, uargs->args,
790 nargs * sizeof(rtas_arg_t)) != 0)
791 return -EFAULT;
792
793 if (args.token == RTAS_UNKNOWN_SERVICE)
794 return -EINVAL;
795
796 /* Need to handle ibm,suspend_me call specially */
797 if (args.token == ibm_suspend_me_token) {
798 rc = rtas_ibm_suspend_me(&args);
799 if (rc)
800 return rc;
801 goto copy_return;
802 }
803
804 buff_copy = get_errorlog_buffer();
805
806 spin_lock_irqsave(&rtas.lock, flags);
807
808 rtas.args = args;
809 enter_rtas(__pa(&rtas.args));
810 args = rtas.args;
811
812 args.rets = &args.args[nargs];
813
814 /* A -1 return code indicates that the last command couldn't
815 be completed due to a hardware error. */
816 if (args.rets[0] == -1)
817 errbuf = __fetch_rtas_last_error(buff_copy);
818
819 spin_unlock_irqrestore(&rtas.lock, flags);
820
821 if (buff_copy) {
822 if (errbuf)
823 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
824 kfree(buff_copy);
825 }
826
827 copy_return:
828 /* Copy out args. */
829 if (copy_to_user(uargs->args + nargs,
830 args.args + nargs,
831 args.nret * sizeof(rtas_arg_t)) != 0)
832 return -EFAULT;
833
834 return 0;
835 }
836
837 /*
838 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
839 * informations from the device-tree and allocate the RMO buffer for userland
840 * accesses.
841 */
842 void __init rtas_initialize(void)
843 {
844 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
845
846 /* Get RTAS dev node and fill up our "rtas" structure with infos
847 * about it.
848 */
849 rtas.dev = of_find_node_by_name(NULL, "rtas");
850 if (rtas.dev) {
851 const u32 *basep, *entryp, *sizep;
852
853 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
854 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
855 if (basep != NULL && sizep != NULL) {
856 rtas.base = *basep;
857 rtas.size = *sizep;
858 entryp = of_get_property(rtas.dev,
859 "linux,rtas-entry", NULL);
860 if (entryp == NULL) /* Ugh */
861 rtas.entry = rtas.base;
862 else
863 rtas.entry = *entryp;
864 } else
865 rtas.dev = NULL;
866 }
867 if (!rtas.dev)
868 return;
869
870 /* If RTAS was found, allocate the RMO buffer for it and look for
871 * the stop-self token if any
872 */
873 #ifdef CONFIG_PPC64
874 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
875 rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
876 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
877 }
878 #endif
879 rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
880
881 #ifdef CONFIG_RTAS_ERROR_LOGGING
882 rtas_last_error_token = rtas_token("rtas-last-error");
883 #endif
884 }
885
886 int __init early_init_dt_scan_rtas(unsigned long node,
887 const char *uname, int depth, void *data)
888 {
889 u32 *basep, *entryp, *sizep;
890
891 if (depth != 1 || strcmp(uname, "rtas") != 0)
892 return 0;
893
894 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
895 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
896 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
897
898 if (basep && entryp && sizep) {
899 rtas.base = *basep;
900 rtas.entry = *entryp;
901 rtas.size = *sizep;
902 }
903
904 #ifdef CONFIG_UDBG_RTAS_CONSOLE
905 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
906 if (basep)
907 rtas_putchar_token = *basep;
908
909 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
910 if (basep)
911 rtas_getchar_token = *basep;
912
913 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
914 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
915 udbg_init_rtas_console();
916
917 #endif
918
919 /* break now */
920 return 1;
921 }
WRT350N Kernel Patches