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[linux-2.6/next.git] / arch / powerpc / kernel / rtas.c
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1 /*
3 * Procedures for interfacing to the RTAS on CHRP machines.
5 * Peter Bergner, IBM March 2001.
6 * Copyright (C) 2001 IBM.
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.
14 #include <stdarg.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/spinlock.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/capability.h>
21 #include <linux/delay.h>
22 #include <linux/smp.h>
23 #include <linux/completion.h>
24 #include <linux/cpumask.h>
25 #include <linux/memblock.h>
26 #include <linux/slab.h>
28 #include <asm/prom.h>
29 #include <asm/rtas.h>
30 #include <asm/hvcall.h>
31 #include <asm/machdep.h>
32 #include <asm/firmware.h>
33 #include <asm/page.h>
34 #include <asm/param.h>
35 #include <asm/system.h>
36 #include <asm/delay.h>
37 #include <asm/uaccess.h>
38 #include <asm/udbg.h>
39 #include <asm/syscalls.h>
40 #include <asm/smp.h>
41 #include <asm/atomic.h>
42 #include <asm/time.h>
43 #include <asm/mmu.h>
44 #include <asm/topology.h>
45 #include <asm/pSeries_reconfig.h>
47 struct rtas_t rtas = {
48 .lock = __ARCH_SPIN_LOCK_UNLOCKED
50 EXPORT_SYMBOL(rtas);
52 DEFINE_SPINLOCK(rtas_data_buf_lock);
53 EXPORT_SYMBOL(rtas_data_buf_lock);
55 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
56 EXPORT_SYMBOL(rtas_data_buf);
58 unsigned long rtas_rmo_buf;
61 * If non-NULL, this gets called when the kernel terminates.
62 * This is done like this so rtas_flash can be a module.
64 void (*rtas_flash_term_hook)(int);
65 EXPORT_SYMBOL(rtas_flash_term_hook);
67 /* RTAS use home made raw locking instead of spin_lock_irqsave
68 * because those can be called from within really nasty contexts
69 * such as having the timebase stopped which would lockup with
70 * normal locks and spinlock debugging enabled
72 static unsigned long lock_rtas(void)
74 unsigned long flags;
76 local_irq_save(flags);
77 preempt_disable();
78 arch_spin_lock_flags(&rtas.lock, flags);
79 return flags;
82 static void unlock_rtas(unsigned long flags)
84 arch_spin_unlock(&rtas.lock);
85 local_irq_restore(flags);
86 preempt_enable();
90 * call_rtas_display_status and call_rtas_display_status_delay
91 * are designed only for very early low-level debugging, which
92 * is why the token is hard-coded to 10.
94 static void call_rtas_display_status(char c)
96 struct rtas_args *args = &rtas.args;
97 unsigned long s;
99 if (!rtas.base)
100 return;
101 s = lock_rtas();
103 args->token = 10;
104 args->nargs = 1;
105 args->nret = 1;
106 args->rets = (rtas_arg_t *)&(args->args[1]);
107 args->args[0] = (unsigned char)c;
109 enter_rtas(__pa(args));
111 unlock_rtas(s);
114 static void call_rtas_display_status_delay(char c)
116 static int pending_newline = 0; /* did last write end with unprinted newline? */
117 static int width = 16;
119 if (c == '\n') {
120 while (width-- > 0)
121 call_rtas_display_status(' ');
122 width = 16;
123 mdelay(500);
124 pending_newline = 1;
125 } else {
126 if (pending_newline) {
127 call_rtas_display_status('\r');
128 call_rtas_display_status('\n');
130 pending_newline = 0;
131 if (width--) {
132 call_rtas_display_status(c);
133 udelay(10000);
138 void __init udbg_init_rtas_panel(void)
140 udbg_putc = call_rtas_display_status_delay;
143 #ifdef CONFIG_UDBG_RTAS_CONSOLE
145 /* If you think you're dying before early_init_dt_scan_rtas() does its
146 * work, you can hard code the token values for your firmware here and
147 * hardcode rtas.base/entry etc.
149 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
150 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
152 static void udbg_rtascon_putc(char c)
154 int tries;
156 if (!rtas.base)
157 return;
159 /* Add CRs before LFs */
160 if (c == '\n')
161 udbg_rtascon_putc('\r');
163 /* if there is more than one character to be displayed, wait a bit */
164 for (tries = 0; tries < 16; tries++) {
165 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
166 break;
167 udelay(1000);
171 static int udbg_rtascon_getc_poll(void)
173 int c;
175 if (!rtas.base)
176 return -1;
178 if (rtas_call(rtas_getchar_token, 0, 2, &c))
179 return -1;
181 return c;
184 static int udbg_rtascon_getc(void)
186 int c;
188 while ((c = udbg_rtascon_getc_poll()) == -1)
191 return c;
195 void __init udbg_init_rtas_console(void)
197 udbg_putc = udbg_rtascon_putc;
198 udbg_getc = udbg_rtascon_getc;
199 udbg_getc_poll = udbg_rtascon_getc_poll;
201 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
203 void rtas_progress(char *s, unsigned short hex)
205 struct device_node *root;
206 int width;
207 const int *p;
208 char *os;
209 static int display_character, set_indicator;
210 static int display_width, display_lines, form_feed;
211 static const int *row_width;
212 static DEFINE_SPINLOCK(progress_lock);
213 static int current_line;
214 static int pending_newline = 0; /* did last write end with unprinted newline? */
216 if (!rtas.base)
217 return;
219 if (display_width == 0) {
220 display_width = 0x10;
221 if ((root = of_find_node_by_path("/rtas"))) {
222 if ((p = of_get_property(root,
223 "ibm,display-line-length", NULL)))
224 display_width = *p;
225 if ((p = of_get_property(root,
226 "ibm,form-feed", NULL)))
227 form_feed = *p;
228 if ((p = of_get_property(root,
229 "ibm,display-number-of-lines", NULL)))
230 display_lines = *p;
231 row_width = of_get_property(root,
232 "ibm,display-truncation-length", NULL);
233 of_node_put(root);
235 display_character = rtas_token("display-character");
236 set_indicator = rtas_token("set-indicator");
239 if (display_character == RTAS_UNKNOWN_SERVICE) {
240 /* use hex display if available */
241 if (set_indicator != RTAS_UNKNOWN_SERVICE)
242 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
243 return;
246 spin_lock(&progress_lock);
249 * Last write ended with newline, but we didn't print it since
250 * it would just clear the bottom line of output. Print it now
251 * instead.
253 * If no newline is pending and form feed is supported, clear the
254 * display with a form feed; otherwise, print a CR to start output
255 * at the beginning of the line.
257 if (pending_newline) {
258 rtas_call(display_character, 1, 1, NULL, '\r');
259 rtas_call(display_character, 1, 1, NULL, '\n');
260 pending_newline = 0;
261 } else {
262 current_line = 0;
263 if (form_feed)
264 rtas_call(display_character, 1, 1, NULL,
265 (char)form_feed);
266 else
267 rtas_call(display_character, 1, 1, NULL, '\r');
270 if (row_width)
271 width = row_width[current_line];
272 else
273 width = display_width;
274 os = s;
275 while (*os) {
276 if (*os == '\n' || *os == '\r') {
277 /* If newline is the last character, save it
278 * until next call to avoid bumping up the
279 * display output.
281 if (*os == '\n' && !os[1]) {
282 pending_newline = 1;
283 current_line++;
284 if (current_line > display_lines-1)
285 current_line = display_lines-1;
286 spin_unlock(&progress_lock);
287 return;
290 /* RTAS wants CR-LF, not just LF */
292 if (*os == '\n') {
293 rtas_call(display_character, 1, 1, NULL, '\r');
294 rtas_call(display_character, 1, 1, NULL, '\n');
295 } else {
296 /* CR might be used to re-draw a line, so we'll
297 * leave it alone and not add LF.
299 rtas_call(display_character, 1, 1, NULL, *os);
302 if (row_width)
303 width = row_width[current_line];
304 else
305 width = display_width;
306 } else {
307 width--;
308 rtas_call(display_character, 1, 1, NULL, *os);
311 os++;
313 /* if we overwrite the screen length */
314 if (width <= 0)
315 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
316 os++;
319 spin_unlock(&progress_lock);
321 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
323 int rtas_token(const char *service)
325 const int *tokp;
326 if (rtas.dev == NULL)
327 return RTAS_UNKNOWN_SERVICE;
328 tokp = of_get_property(rtas.dev, service, NULL);
329 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
331 EXPORT_SYMBOL(rtas_token);
333 int rtas_service_present(const char *service)
335 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
337 EXPORT_SYMBOL(rtas_service_present);
339 #ifdef CONFIG_RTAS_ERROR_LOGGING
341 * Return the firmware-specified size of the error log buffer
342 * for all rtas calls that require an error buffer argument.
343 * This includes 'check-exception' and 'rtas-last-error'.
345 int rtas_get_error_log_max(void)
347 static int rtas_error_log_max;
348 if (rtas_error_log_max)
349 return rtas_error_log_max;
351 rtas_error_log_max = rtas_token ("rtas-error-log-max");
352 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
353 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
354 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
355 rtas_error_log_max);
356 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
358 return rtas_error_log_max;
360 EXPORT_SYMBOL(rtas_get_error_log_max);
363 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
364 static int rtas_last_error_token;
366 /** Return a copy of the detailed error text associated with the
367 * most recent failed call to rtas. Because the error text
368 * might go stale if there are any other intervening rtas calls,
369 * this routine must be called atomically with whatever produced
370 * the error (i.e. with rtas.lock still held from the previous call).
372 static char *__fetch_rtas_last_error(char *altbuf)
374 struct rtas_args err_args, save_args;
375 u32 bufsz;
376 char *buf = NULL;
378 if (rtas_last_error_token == -1)
379 return NULL;
381 bufsz = rtas_get_error_log_max();
383 err_args.token = rtas_last_error_token;
384 err_args.nargs = 2;
385 err_args.nret = 1;
386 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
387 err_args.args[1] = bufsz;
388 err_args.args[2] = 0;
390 save_args = rtas.args;
391 rtas.args = err_args;
393 enter_rtas(__pa(&rtas.args));
395 err_args = rtas.args;
396 rtas.args = save_args;
398 /* Log the error in the unlikely case that there was one. */
399 if (unlikely(err_args.args[2] == 0)) {
400 if (altbuf) {
401 buf = altbuf;
402 } else {
403 buf = rtas_err_buf;
404 if (mem_init_done)
405 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
407 if (buf)
408 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
411 return buf;
414 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
416 #else /* CONFIG_RTAS_ERROR_LOGGING */
417 #define __fetch_rtas_last_error(x) NULL
418 #define get_errorlog_buffer() NULL
419 #endif
421 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
423 va_list list;
424 int i;
425 unsigned long s;
426 struct rtas_args *rtas_args;
427 char *buff_copy = NULL;
428 int ret;
430 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
431 return -1;
433 s = lock_rtas();
434 rtas_args = &rtas.args;
436 rtas_args->token = token;
437 rtas_args->nargs = nargs;
438 rtas_args->nret = nret;
439 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
440 va_start(list, outputs);
441 for (i = 0; i < nargs; ++i)
442 rtas_args->args[i] = va_arg(list, rtas_arg_t);
443 va_end(list);
445 for (i = 0; i < nret; ++i)
446 rtas_args->rets[i] = 0;
448 enter_rtas(__pa(rtas_args));
450 /* A -1 return code indicates that the last command couldn't
451 be completed due to a hardware error. */
452 if (rtas_args->rets[0] == -1)
453 buff_copy = __fetch_rtas_last_error(NULL);
455 if (nret > 1 && outputs != NULL)
456 for (i = 0; i < nret-1; ++i)
457 outputs[i] = rtas_args->rets[i+1];
458 ret = (nret > 0)? rtas_args->rets[0]: 0;
460 unlock_rtas(s);
462 if (buff_copy) {
463 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
464 if (mem_init_done)
465 kfree(buff_copy);
467 return ret;
469 EXPORT_SYMBOL(rtas_call);
471 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
472 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
474 unsigned int rtas_busy_delay_time(int status)
476 int order;
477 unsigned int ms = 0;
479 if (status == RTAS_BUSY) {
480 ms = 1;
481 } else if (status >= 9900 && status <= 9905) {
482 order = status - 9900;
483 for (ms = 1; order > 0; order--)
484 ms *= 10;
487 return ms;
489 EXPORT_SYMBOL(rtas_busy_delay_time);
491 /* For an RTAS busy status code, perform the hinted delay. */
492 unsigned int rtas_busy_delay(int status)
494 unsigned int ms;
496 might_sleep();
497 ms = rtas_busy_delay_time(status);
498 if (ms && need_resched())
499 msleep(ms);
501 return ms;
503 EXPORT_SYMBOL(rtas_busy_delay);
505 static int rtas_error_rc(int rtas_rc)
507 int rc;
509 switch (rtas_rc) {
510 case -1: /* Hardware Error */
511 rc = -EIO;
512 break;
513 case -3: /* Bad indicator/domain/etc */
514 rc = -EINVAL;
515 break;
516 case -9000: /* Isolation error */
517 rc = -EFAULT;
518 break;
519 case -9001: /* Outstanding TCE/PTE */
520 rc = -EEXIST;
521 break;
522 case -9002: /* No usable slot */
523 rc = -ENODEV;
524 break;
525 default:
526 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
527 __func__, rtas_rc);
528 rc = -ERANGE;
529 break;
531 return rc;
534 int rtas_get_power_level(int powerdomain, int *level)
536 int token = rtas_token("get-power-level");
537 int rc;
539 if (token == RTAS_UNKNOWN_SERVICE)
540 return -ENOENT;
542 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
543 udelay(1);
545 if (rc < 0)
546 return rtas_error_rc(rc);
547 return rc;
549 EXPORT_SYMBOL(rtas_get_power_level);
551 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
553 int token = rtas_token("set-power-level");
554 int rc;
556 if (token == RTAS_UNKNOWN_SERVICE)
557 return -ENOENT;
559 do {
560 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
561 } while (rtas_busy_delay(rc));
563 if (rc < 0)
564 return rtas_error_rc(rc);
565 return rc;
567 EXPORT_SYMBOL(rtas_set_power_level);
569 int rtas_get_sensor(int sensor, int index, int *state)
571 int token = rtas_token("get-sensor-state");
572 int rc;
574 if (token == RTAS_UNKNOWN_SERVICE)
575 return -ENOENT;
577 do {
578 rc = rtas_call(token, 2, 2, state, sensor, index);
579 } while (rtas_busy_delay(rc));
581 if (rc < 0)
582 return rtas_error_rc(rc);
583 return rc;
585 EXPORT_SYMBOL(rtas_get_sensor);
587 bool rtas_indicator_present(int token, int *maxindex)
589 int proplen, count, i;
590 const struct indicator_elem {
591 u32 token;
592 u32 maxindex;
593 } *indicators;
595 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
596 if (!indicators)
597 return false;
599 count = proplen / sizeof(struct indicator_elem);
601 for (i = 0; i < count; i++) {
602 if (indicators[i].token != token)
603 continue;
604 if (maxindex)
605 *maxindex = indicators[i].maxindex;
606 return true;
609 return false;
611 EXPORT_SYMBOL(rtas_indicator_present);
613 int rtas_set_indicator(int indicator, int index, int new_value)
615 int token = rtas_token("set-indicator");
616 int rc;
618 if (token == RTAS_UNKNOWN_SERVICE)
619 return -ENOENT;
621 do {
622 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
623 } while (rtas_busy_delay(rc));
625 if (rc < 0)
626 return rtas_error_rc(rc);
627 return rc;
629 EXPORT_SYMBOL(rtas_set_indicator);
632 * Ignoring RTAS extended delay
634 int rtas_set_indicator_fast(int indicator, int index, int new_value)
636 int rc;
637 int token = rtas_token("set-indicator");
639 if (token == RTAS_UNKNOWN_SERVICE)
640 return -ENOENT;
642 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
644 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));
646 if (rc < 0)
647 return rtas_error_rc(rc);
649 return rc;
652 void rtas_restart(char *cmd)
654 if (rtas_flash_term_hook)
655 rtas_flash_term_hook(SYS_RESTART);
656 printk("RTAS system-reboot returned %d\n",
657 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
658 for (;;);
661 void rtas_power_off(void)
663 if (rtas_flash_term_hook)
664 rtas_flash_term_hook(SYS_POWER_OFF);
665 /* allow power on only with power button press */
666 printk("RTAS power-off returned %d\n",
667 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
668 for (;;);
671 void rtas_halt(void)
673 if (rtas_flash_term_hook)
674 rtas_flash_term_hook(SYS_HALT);
675 /* allow power on only with power button press */
676 printk("RTAS power-off returned %d\n",
677 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
678 for (;;);
681 /* Must be in the RMO region, so we place it here */
682 static char rtas_os_term_buf[2048];
684 void rtas_os_term(char *str)
686 int status;
689 * Firmware with the ibm,extended-os-term property is guaranteed
690 * to always return from an ibm,os-term call. Earlier versions without
691 * this property may terminate the partition which we want to avoid
692 * since it interferes with panic_timeout.
694 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
695 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
696 return;
698 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
700 do {
701 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
702 __pa(rtas_os_term_buf));
703 } while (rtas_busy_delay(status));
705 if (status != 0)
706 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
709 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
710 #ifdef CONFIG_PPC_PSERIES
711 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
713 u16 slb_size = mmu_slb_size;
714 int rc = H_MULTI_THREADS_ACTIVE;
715 int cpu;
717 slb_set_size(SLB_MIN_SIZE);
718 stop_topology_update();
719 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
721 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
722 !atomic_read(&data->error))
723 rc = rtas_call(data->token, 0, 1, NULL);
725 if (rc || atomic_read(&data->error)) {
726 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
727 slb_set_size(slb_size);
730 if (atomic_read(&data->error))
731 rc = atomic_read(&data->error);
733 atomic_set(&data->error, rc);
734 start_topology_update();
735 pSeries_coalesce_init();
737 if (wake_when_done) {
738 atomic_set(&data->done, 1);
740 for_each_online_cpu(cpu)
741 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
744 if (atomic_dec_return(&data->working) == 0)
745 complete(data->complete);
747 return rc;
750 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
752 atomic_inc(&data->working);
753 return __rtas_suspend_last_cpu(data, 0);
756 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
758 long rc = H_SUCCESS;
759 unsigned long msr_save;
760 int cpu;
762 atomic_inc(&data->working);
764 /* really need to ensure MSR.EE is off for H_JOIN */
765 msr_save = mfmsr();
766 mtmsr(msr_save & ~(MSR_EE));
768 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
769 rc = plpar_hcall_norets(H_JOIN);
771 mtmsr(msr_save);
773 if (rc == H_SUCCESS) {
774 /* This cpu was prodded and the suspend is complete. */
775 goto out;
776 } else if (rc == H_CONTINUE) {
777 /* All other cpus are in H_JOIN, this cpu does
778 * the suspend.
780 return __rtas_suspend_last_cpu(data, wake_when_done);
781 } else {
782 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
783 smp_processor_id(), rc);
784 atomic_set(&data->error, rc);
787 if (wake_when_done) {
788 atomic_set(&data->done, 1);
790 /* This cpu did the suspend or got an error; in either case,
791 * we need to prod all other other cpus out of join state.
792 * Extra prods are harmless.
794 for_each_online_cpu(cpu)
795 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
797 out:
798 if (atomic_dec_return(&data->working) == 0)
799 complete(data->complete);
800 return rc;
803 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
805 return __rtas_suspend_cpu(data, 0);
808 static void rtas_percpu_suspend_me(void *info)
810 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
813 int rtas_ibm_suspend_me(struct rtas_args *args)
815 long state;
816 long rc;
817 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
818 struct rtas_suspend_me_data data;
819 DECLARE_COMPLETION_ONSTACK(done);
821 if (!rtas_service_present("ibm,suspend-me"))
822 return -ENOSYS;
824 /* Make sure the state is valid */
825 rc = plpar_hcall(H_VASI_STATE, retbuf,
826 ((u64)args->args[0] << 32) | args->args[1]);
828 state = retbuf[0];
830 if (rc) {
831 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
832 return rc;
833 } else if (state == H_VASI_ENABLED) {
834 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
835 return 0;
836 } else if (state != H_VASI_SUSPENDING) {
837 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
838 state);
839 args->args[args->nargs] = -1;
840 return 0;
843 atomic_set(&data.working, 0);
844 atomic_set(&data.done, 0);
845 atomic_set(&data.error, 0);
846 data.token = rtas_token("ibm,suspend-me");
847 data.complete = &done;
849 /* Call function on all CPUs. One of us will make the
850 * rtas call
852 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
853 atomic_set(&data.error, -EINVAL);
855 wait_for_completion(&done);
857 if (atomic_read(&data.error) != 0)
858 printk(KERN_ERR "Error doing global join\n");
860 return atomic_read(&data.error);
862 #else /* CONFIG_PPC_PSERIES */
863 int rtas_ibm_suspend_me(struct rtas_args *args)
865 return -ENOSYS;
867 #endif
869 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
871 struct rtas_args args;
872 unsigned long flags;
873 char *buff_copy, *errbuf = NULL;
874 int nargs;
875 int rc;
877 if (!capable(CAP_SYS_ADMIN))
878 return -EPERM;
880 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
881 return -EFAULT;
883 nargs = args.nargs;
884 if (nargs > ARRAY_SIZE(args.args)
885 || args.nret > ARRAY_SIZE(args.args)
886 || nargs + args.nret > ARRAY_SIZE(args.args))
887 return -EINVAL;
889 /* Copy in args. */
890 if (copy_from_user(args.args, uargs->args,
891 nargs * sizeof(rtas_arg_t)) != 0)
892 return -EFAULT;
894 if (args.token == RTAS_UNKNOWN_SERVICE)
895 return -EINVAL;
897 args.rets = &args.args[nargs];
898 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
900 /* Need to handle ibm,suspend_me call specially */
901 if (args.token == ibm_suspend_me_token) {
902 rc = rtas_ibm_suspend_me(&args);
903 if (rc)
904 return rc;
905 goto copy_return;
908 buff_copy = get_errorlog_buffer();
910 flags = lock_rtas();
912 rtas.args = args;
913 enter_rtas(__pa(&rtas.args));
914 args = rtas.args;
916 /* A -1 return code indicates that the last command couldn't
917 be completed due to a hardware error. */
918 if (args.rets[0] == -1)
919 errbuf = __fetch_rtas_last_error(buff_copy);
921 unlock_rtas(flags);
923 if (buff_copy) {
924 if (errbuf)
925 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
926 kfree(buff_copy);
929 copy_return:
930 /* Copy out args. */
931 if (copy_to_user(uargs->args + nargs,
932 args.args + nargs,
933 args.nret * sizeof(rtas_arg_t)) != 0)
934 return -EFAULT;
936 return 0;
940 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
941 * informations from the device-tree and allocate the RMO buffer for userland
942 * accesses.
944 void __init rtas_initialize(void)
946 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
948 /* Get RTAS dev node and fill up our "rtas" structure with infos
949 * about it.
951 rtas.dev = of_find_node_by_name(NULL, "rtas");
952 if (rtas.dev) {
953 const u32 *basep, *entryp, *sizep;
955 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
956 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
957 if (basep != NULL && sizep != NULL) {
958 rtas.base = *basep;
959 rtas.size = *sizep;
960 entryp = of_get_property(rtas.dev,
961 "linux,rtas-entry", NULL);
962 if (entryp == NULL) /* Ugh */
963 rtas.entry = rtas.base;
964 else
965 rtas.entry = *entryp;
966 } else
967 rtas.dev = NULL;
969 if (!rtas.dev)
970 return;
972 /* If RTAS was found, allocate the RMO buffer for it and look for
973 * the stop-self token if any
975 #ifdef CONFIG_PPC64
976 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
977 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
978 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
980 #endif
981 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
983 #ifdef CONFIG_RTAS_ERROR_LOGGING
984 rtas_last_error_token = rtas_token("rtas-last-error");
985 #endif
988 int __init early_init_dt_scan_rtas(unsigned long node,
989 const char *uname, int depth, void *data)
991 u32 *basep, *entryp, *sizep;
993 if (depth != 1 || strcmp(uname, "rtas") != 0)
994 return 0;
996 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
997 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
998 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1000 if (basep && entryp && sizep) {
1001 rtas.base = *basep;
1002 rtas.entry = *entryp;
1003 rtas.size = *sizep;
1006 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1007 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1008 if (basep)
1009 rtas_putchar_token = *basep;
1011 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1012 if (basep)
1013 rtas_getchar_token = *basep;
1015 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1016 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1017 udbg_init_rtas_console();
1019 #endif
1021 /* break now */
1022 return 1;
1025 static arch_spinlock_t timebase_lock;
1026 static u64 timebase = 0;
1028 void __cpuinit rtas_give_timebase(void)
1030 unsigned long flags;
1032 local_irq_save(flags);
1033 hard_irq_disable();
1034 arch_spin_lock(&timebase_lock);
1035 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1036 timebase = get_tb();
1037 arch_spin_unlock(&timebase_lock);
1039 while (timebase)
1040 barrier();
1041 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1042 local_irq_restore(flags);
1045 void __cpuinit rtas_take_timebase(void)
1047 while (!timebase)
1048 barrier();
1049 arch_spin_lock(&timebase_lock);
1050 set_tb(timebase >> 32, timebase & 0xffffffff);
1051 timebase = 0;
1052 arch_spin_unlock(&timebase_lock);