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.
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>
32 #include <asm/hvcall.h>
33 #include <asm/machdep.h>
34 #include <asm/firmware.h>
36 #include <asm/param.h>
37 #include <asm/delay.h>
38 #include <asm/uaccess.h>
40 #include <asm/syscalls.h>
42 #include <linux/atomic.h>
45 #include <asm/topology.h>
47 struct rtas_t rtas
= {
48 .lock
= __ARCH_SPIN_LOCK_UNLOCKED
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)
76 local_irq_save(flags
);
78 arch_spin_lock_flags(&rtas
.lock
, flags
);
82 static void unlock_rtas(unsigned long flags
)
84 arch_spin_unlock(&rtas
.lock
);
85 local_irq_restore(flags
);
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(unsigned char c
)
96 struct rtas_args
*args
= &rtas
.args
;
103 args
->token
= cpu_to_be32(10);
104 args
->nargs
= cpu_to_be32(1);
105 args
->nret
= cpu_to_be32(1);
106 args
->rets
= &(args
->args
[1]);
107 args
->args
[0] = cpu_to_be32(c
);
109 enter_rtas(__pa(args
));
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;
121 call_rtas_display_status(' ');
126 if (pending_newline
) {
127 call_rtas_display_status('\r');
128 call_rtas_display_status('\n');
132 call_rtas_display_status(c
);
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
)
159 /* Add CRs before LFs */
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)
171 static int udbg_rtascon_getc_poll(void)
178 if (rtas_call(rtas_getchar_token
, 0, 2, &c
))
184 static int udbg_rtascon_getc(void)
188 while ((c
= udbg_rtascon_getc_poll()) == -1)
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
;
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? */
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
= be32_to_cpu(*p
);
225 if ((p
= of_get_property(root
,
226 "ibm,form-feed", NULL
)))
227 form_feed
= be32_to_cpu(*p
);
228 if ((p
= of_get_property(root
,
229 "ibm,display-number-of-lines", NULL
)))
230 display_lines
= be32_to_cpu(*p
);
231 row_width
= of_get_property(root
,
232 "ibm,display-truncation-length", NULL
);
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
);
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
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');
264 rtas_call(display_character
, 1, 1, NULL
,
267 rtas_call(display_character
, 1, 1, NULL
, '\r');
271 width
= row_width
[current_line
];
273 width
= display_width
;
276 if (*os
== '\n' || *os
== '\r') {
277 /* If newline is the last character, save it
278 * until next call to avoid bumping up the
281 if (*os
== '\n' && !os
[1]) {
284 if (current_line
> display_lines
-1)
285 current_line
= display_lines
-1;
286 spin_unlock(&progress_lock
);
290 /* RTAS wants CR-LF, not just LF */
293 rtas_call(display_character
, 1, 1, NULL
, '\r');
294 rtas_call(display_character
, 1, 1, NULL
, '\n');
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
);
303 width
= row_width
[current_line
];
305 width
= display_width
;
308 rtas_call(display_character
, 1, 1, NULL
, *os
);
313 /* if we overwrite the screen length */
315 while ((*os
!= 0) && (*os
!= '\n') && (*os
!= '\r'))
319 spin_unlock(&progress_lock
);
321 EXPORT_SYMBOL(rtas_progress
); /* needed by rtas_flash module */
323 int rtas_token(const char *service
)
326 if (rtas
.dev
== NULL
)
327 return RTAS_UNKNOWN_SERVICE
;
328 tokp
= of_get_property(rtas
.dev
, service
, NULL
);
329 return tokp
? be32_to_cpu(*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",
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
;
378 if (rtas_last_error_token
== -1)
381 bufsz
= rtas_get_error_log_max();
383 err_args
.token
= cpu_to_be32(rtas_last_error_token
);
384 err_args
.nargs
= cpu_to_be32(2);
385 err_args
.nret
= cpu_to_be32(1);
386 err_args
.args
[0] = cpu_to_be32(__pa(rtas_err_buf
));
387 err_args
.args
[1] = cpu_to_be32(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)) {
405 buf
= kmalloc(RTAS_ERROR_LOG_MAX
, GFP_ATOMIC
);
408 memcpy(buf
, rtas_err_buf
, RTAS_ERROR_LOG_MAX
);
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
421 int rtas_call(int token
, int nargs
, int nret
, int *outputs
, ...)
426 struct rtas_args
*rtas_args
;
427 char *buff_copy
= NULL
;
430 if (!rtas
.entry
|| token
== RTAS_UNKNOWN_SERVICE
)
434 rtas_args
= &rtas
.args
;
436 rtas_args
->token
= cpu_to_be32(token
);
437 rtas_args
->nargs
= cpu_to_be32(nargs
);
438 rtas_args
->nret
= cpu_to_be32(nret
);
439 rtas_args
->rets
= &(rtas_args
->args
[nargs
]);
440 va_start(list
, outputs
);
441 for (i
= 0; i
< nargs
; ++i
)
442 rtas_args
->args
[i
] = cpu_to_be32(va_arg(list
, __u32
));
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 (be32_to_cpu(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
] = be32_to_cpu(rtas_args
->rets
[i
+1]);
458 ret
= (nret
> 0)? be32_to_cpu(rtas_args
->rets
[0]): 0;
463 log_error(buff_copy
, ERR_TYPE_RTAS_LOG
, 0);
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
)
479 if (status
== RTAS_BUSY
) {
481 } else if (status
>= 9900 && status
<= 9905) {
482 order
= status
- 9900;
483 for (ms
= 1; order
> 0; order
--)
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
)
497 ms
= rtas_busy_delay_time(status
);
498 if (ms
&& need_resched())
503 EXPORT_SYMBOL(rtas_busy_delay
);
505 static int rtas_error_rc(int rtas_rc
)
510 case -1: /* Hardware Error */
513 case -3: /* Bad indicator/domain/etc */
516 case -9000: /* Isolation error */
519 case -9001: /* Outstanding TCE/PTE */
522 case -9002: /* No usable slot */
526 printk(KERN_ERR
"%s: unexpected RTAS error %d\n",
534 int rtas_get_power_level(int powerdomain
, int *level
)
536 int token
= rtas_token("get-power-level");
539 if (token
== RTAS_UNKNOWN_SERVICE
)
542 while ((rc
= rtas_call(token
, 1, 2, level
, powerdomain
)) == RTAS_BUSY
)
546 return rtas_error_rc(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");
556 if (token
== RTAS_UNKNOWN_SERVICE
)
560 rc
= rtas_call(token
, 2, 2, setlevel
, powerdomain
, level
);
561 } while (rtas_busy_delay(rc
));
564 return rtas_error_rc(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");
574 if (token
== RTAS_UNKNOWN_SERVICE
)
578 rc
= rtas_call(token
, 2, 2, state
, sensor
, index
);
579 } while (rtas_busy_delay(rc
));
582 return rtas_error_rc(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
{
595 indicators
= of_get_property(rtas
.dev
, "rtas-indicators", &proplen
);
599 count
= proplen
/ sizeof(struct indicator_elem
);
601 for (i
= 0; i
< count
; i
++) {
602 if (__be32_to_cpu(indicators
[i
].token
) != token
)
605 *maxindex
= __be32_to_cpu(indicators
[i
].maxindex
);
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");
618 if (token
== RTAS_UNKNOWN_SERVICE
)
622 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
623 } while (rtas_busy_delay(rc
));
626 return rtas_error_rc(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
)
637 int token
= rtas_token("set-indicator");
639 if (token
== RTAS_UNKNOWN_SERVICE
)
642 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
644 WARN_ON(rc
== -2 || (rc
>= 9900 && rc
<= 9905));
647 return rtas_error_rc(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
));
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));
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));
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
)
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"))
698 snprintf(rtas_os_term_buf
, 2048, "OS panic: %s", str
);
701 status
= rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL
,
702 __pa(rtas_os_term_buf
));
703 } while (rtas_busy_delay(status
));
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
;
717 slb_set_size(SLB_MIN_SIZE
);
718 printk(KERN_DEBUG
"calling ibm,suspend-me on cpu %i\n", smp_processor_id());
720 while (rc
== H_MULTI_THREADS_ACTIVE
&& !atomic_read(&data
->done
) &&
721 !atomic_read(&data
->error
))
722 rc
= rtas_call(data
->token
, 0, 1, NULL
);
724 if (rc
|| atomic_read(&data
->error
)) {
725 printk(KERN_DEBUG
"ibm,suspend-me returned %d\n", rc
);
726 slb_set_size(slb_size
);
729 if (atomic_read(&data
->error
))
730 rc
= atomic_read(&data
->error
);
732 atomic_set(&data
->error
, rc
);
733 pSeries_coalesce_init();
735 if (wake_when_done
) {
736 atomic_set(&data
->done
, 1);
738 for_each_online_cpu(cpu
)
739 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
742 if (atomic_dec_return(&data
->working
) == 0)
743 complete(data
->complete
);
748 int rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
)
750 atomic_inc(&data
->working
);
751 return __rtas_suspend_last_cpu(data
, 0);
754 static int __rtas_suspend_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
757 unsigned long msr_save
;
760 atomic_inc(&data
->working
);
762 /* really need to ensure MSR.EE is off for H_JOIN */
764 mtmsr(msr_save
& ~(MSR_EE
));
766 while (rc
== H_SUCCESS
&& !atomic_read(&data
->done
) && !atomic_read(&data
->error
))
767 rc
= plpar_hcall_norets(H_JOIN
);
771 if (rc
== H_SUCCESS
) {
772 /* This cpu was prodded and the suspend is complete. */
774 } else if (rc
== H_CONTINUE
) {
775 /* All other cpus are in H_JOIN, this cpu does
778 return __rtas_suspend_last_cpu(data
, wake_when_done
);
780 printk(KERN_ERR
"H_JOIN on cpu %i failed with rc = %ld\n",
781 smp_processor_id(), rc
);
782 atomic_set(&data
->error
, rc
);
785 if (wake_when_done
) {
786 atomic_set(&data
->done
, 1);
788 /* This cpu did the suspend or got an error; in either case,
789 * we need to prod all other other cpus out of join state.
790 * Extra prods are harmless.
792 for_each_online_cpu(cpu
)
793 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
796 if (atomic_dec_return(&data
->working
) == 0)
797 complete(data
->complete
);
801 int rtas_suspend_cpu(struct rtas_suspend_me_data
*data
)
803 return __rtas_suspend_cpu(data
, 0);
806 static void rtas_percpu_suspend_me(void *info
)
808 __rtas_suspend_cpu((struct rtas_suspend_me_data
*)info
, 1);
811 enum rtas_cpu_state
{
817 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state
,
820 if (!cpumask_empty(cpus
)) {
827 /* On return cpumask will be altered to indicate CPUs changed.
828 * CPUs with states changed will be set in the mask,
829 * CPUs with status unchanged will be unset in the mask. */
830 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state
,
837 if (cpumask_empty(cpus
))
840 for_each_cpu(cpu
, cpus
) {
843 cpuret
= cpu_down(cpu
);
846 cpuret
= cpu_up(cpu
);
850 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
852 ((state
== UP
) ? "up" : "down"),
857 /* clear bits for unchanged cpus, return */
858 cpumask_shift_right(cpus
, cpus
, cpu
);
859 cpumask_shift_left(cpus
, cpus
, cpu
);
862 /* clear bit for unchanged cpu, continue */
863 cpumask_clear_cpu(cpu
, cpus
);
872 int rtas_online_cpus_mask(cpumask_var_t cpus
)
876 ret
= rtas_cpu_state_change_mask(UP
, cpus
);
879 cpumask_var_t tmp_mask
;
881 if (!alloc_cpumask_var(&tmp_mask
, GFP_TEMPORARY
))
884 /* Use tmp_mask to preserve cpus mask from first failure */
885 cpumask_copy(tmp_mask
, cpus
);
886 rtas_offline_cpus_mask(tmp_mask
);
887 free_cpumask_var(tmp_mask
);
892 EXPORT_SYMBOL(rtas_online_cpus_mask
);
894 int rtas_offline_cpus_mask(cpumask_var_t cpus
)
896 return rtas_cpu_state_change_mask(DOWN
, cpus
);
898 EXPORT_SYMBOL(rtas_offline_cpus_mask
);
900 int rtas_ibm_suspend_me(struct rtas_args
*args
)
904 unsigned long retbuf
[PLPAR_HCALL_BUFSIZE
];
905 struct rtas_suspend_me_data data
;
906 DECLARE_COMPLETION_ONSTACK(done
);
907 cpumask_var_t offline_mask
;
910 if (!rtas_service_present("ibm,suspend-me"))
913 /* Make sure the state is valid */
914 rc
= plpar_hcall(H_VASI_STATE
, retbuf
,
915 ((u64
)args
->args
[0] << 32) | args
->args
[1]);
920 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned %ld\n",rc
);
922 } else if (state
== H_VASI_ENABLED
) {
923 args
->args
[args
->nargs
] = RTAS_NOT_SUSPENDABLE
;
925 } else if (state
!= H_VASI_SUSPENDING
) {
926 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned state %ld\n",
928 args
->args
[args
->nargs
] = -1;
932 if (!alloc_cpumask_var(&offline_mask
, GFP_TEMPORARY
))
935 atomic_set(&data
.working
, 0);
936 atomic_set(&data
.done
, 0);
937 atomic_set(&data
.error
, 0);
938 data
.token
= rtas_token("ibm,suspend-me");
939 data
.complete
= &done
;
941 /* All present CPUs must be online */
942 cpumask_andnot(offline_mask
, cpu_present_mask
, cpu_online_mask
);
943 cpuret
= rtas_online_cpus_mask(offline_mask
);
945 pr_err("%s: Could not bring present CPUs online.\n", __func__
);
946 atomic_set(&data
.error
, cpuret
);
950 stop_topology_update();
952 /* Call function on all CPUs. One of us will make the
955 if (on_each_cpu(rtas_percpu_suspend_me
, &data
, 0))
956 atomic_set(&data
.error
, -EINVAL
);
958 wait_for_completion(&done
);
960 if (atomic_read(&data
.error
) != 0)
961 printk(KERN_ERR
"Error doing global join\n");
963 start_topology_update();
965 /* Take down CPUs not online prior to suspend */
966 cpuret
= rtas_offline_cpus_mask(offline_mask
);
968 pr_warn("%s: Could not restore CPUs to offline state.\n",
972 free_cpumask_var(offline_mask
);
973 return atomic_read(&data
.error
);
975 #else /* CONFIG_PPC_PSERIES */
976 int rtas_ibm_suspend_me(struct rtas_args
*args
)
983 * Find a specific pseries error log in an RTAS extended event log.
984 * @log: RTAS error/event log
985 * @section_id: two character section identifier
987 * Returns a pointer to the specified errorlog or NULL if not found.
989 struct pseries_errorlog
*get_pseries_errorlog(struct rtas_error_log
*log
,
992 struct rtas_ext_event_log_v6
*ext_log
=
993 (struct rtas_ext_event_log_v6
*)log
->buffer
;
994 struct pseries_errorlog
*sect
;
995 unsigned char *p
, *log_end
;
996 uint32_t ext_log_length
= rtas_error_extended_log_length(log
);
997 uint8_t log_format
= rtas_ext_event_log_format(ext_log
);
998 uint32_t company_id
= rtas_ext_event_company_id(ext_log
);
1000 /* Check that we understand the format */
1001 if (ext_log_length
< sizeof(struct rtas_ext_event_log_v6
) ||
1002 log_format
!= RTAS_V6EXT_LOG_FORMAT_EVENT_LOG
||
1003 company_id
!= RTAS_V6EXT_COMPANY_ID_IBM
)
1006 log_end
= log
->buffer
+ ext_log_length
;
1007 p
= ext_log
->vendor_log
;
1009 while (p
< log_end
) {
1010 sect
= (struct pseries_errorlog
*)p
;
1011 if (pseries_errorlog_id(sect
) == section_id
)
1013 p
+= pseries_errorlog_length(sect
);
1019 /* We assume to be passed big endian arguments */
1020 asmlinkage
int ppc_rtas(struct rtas_args __user
*uargs
)
1022 struct rtas_args args
;
1023 unsigned long flags
;
1024 char *buff_copy
, *errbuf
= NULL
;
1025 int nargs
, nret
, token
;
1028 if (!capable(CAP_SYS_ADMIN
))
1031 if (copy_from_user(&args
, uargs
, 3 * sizeof(u32
)) != 0)
1034 nargs
= be32_to_cpu(args
.nargs
);
1035 nret
= be32_to_cpu(args
.nret
);
1036 token
= be32_to_cpu(args
.token
);
1038 if (nargs
> ARRAY_SIZE(args
.args
)
1039 || nret
> ARRAY_SIZE(args
.args
)
1040 || nargs
+ nret
> ARRAY_SIZE(args
.args
))
1044 if (copy_from_user(args
.args
, uargs
->args
,
1045 nargs
* sizeof(rtas_arg_t
)) != 0)
1048 if (token
== RTAS_UNKNOWN_SERVICE
)
1051 args
.rets
= &args
.args
[nargs
];
1052 memset(args
.rets
, 0, nret
* sizeof(rtas_arg_t
));
1054 /* Need to handle ibm,suspend_me call specially */
1055 if (token
== ibm_suspend_me_token
) {
1056 rc
= rtas_ibm_suspend_me(&args
);
1062 buff_copy
= get_errorlog_buffer();
1064 flags
= lock_rtas();
1067 enter_rtas(__pa(&rtas
.args
));
1070 /* A -1 return code indicates that the last command couldn't
1071 be completed due to a hardware error. */
1072 if (be32_to_cpu(args
.rets
[0]) == -1)
1073 errbuf
= __fetch_rtas_last_error(buff_copy
);
1079 log_error(errbuf
, ERR_TYPE_RTAS_LOG
, 0);
1084 /* Copy out args. */
1085 if (copy_to_user(uargs
->args
+ nargs
,
1087 nret
* sizeof(rtas_arg_t
)) != 0)
1094 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
1095 * informations from the device-tree and allocate the RMO buffer for userland
1098 void __init
rtas_initialize(void)
1100 unsigned long rtas_region
= RTAS_INSTANTIATE_MAX
;
1102 /* Get RTAS dev node and fill up our "rtas" structure with infos
1105 rtas
.dev
= of_find_node_by_name(NULL
, "rtas");
1107 const __be32
*basep
, *entryp
, *sizep
;
1109 basep
= of_get_property(rtas
.dev
, "linux,rtas-base", NULL
);
1110 sizep
= of_get_property(rtas
.dev
, "rtas-size", NULL
);
1111 if (basep
!= NULL
&& sizep
!= NULL
) {
1112 rtas
.base
= __be32_to_cpu(*basep
);
1113 rtas
.size
= __be32_to_cpu(*sizep
);
1114 entryp
= of_get_property(rtas
.dev
,
1115 "linux,rtas-entry", NULL
);
1116 if (entryp
== NULL
) /* Ugh */
1117 rtas
.entry
= rtas
.base
;
1119 rtas
.entry
= __be32_to_cpu(*entryp
);
1126 /* If RTAS was found, allocate the RMO buffer for it and look for
1127 * the stop-self token if any
1130 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
)) {
1131 rtas_region
= min(ppc64_rma_size
, RTAS_INSTANTIATE_MAX
);
1132 ibm_suspend_me_token
= rtas_token("ibm,suspend-me");
1135 rtas_rmo_buf
= memblock_alloc_base(RTAS_RMOBUF_MAX
, PAGE_SIZE
, rtas_region
);
1137 #ifdef CONFIG_RTAS_ERROR_LOGGING
1138 rtas_last_error_token
= rtas_token("rtas-last-error");
1142 int __init
early_init_dt_scan_rtas(unsigned long node
,
1143 const char *uname
, int depth
, void *data
)
1145 u32
*basep
, *entryp
, *sizep
;
1147 if (depth
!= 1 || strcmp(uname
, "rtas") != 0)
1150 basep
= of_get_flat_dt_prop(node
, "linux,rtas-base", NULL
);
1151 entryp
= of_get_flat_dt_prop(node
, "linux,rtas-entry", NULL
);
1152 sizep
= of_get_flat_dt_prop(node
, "rtas-size", NULL
);
1154 if (basep
&& entryp
&& sizep
) {
1156 rtas
.entry
= *entryp
;
1160 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1161 basep
= of_get_flat_dt_prop(node
, "put-term-char", NULL
);
1163 rtas_putchar_token
= *basep
;
1165 basep
= of_get_flat_dt_prop(node
, "get-term-char", NULL
);
1167 rtas_getchar_token
= *basep
;
1169 if (rtas_putchar_token
!= RTAS_UNKNOWN_SERVICE
&&
1170 rtas_getchar_token
!= RTAS_UNKNOWN_SERVICE
)
1171 udbg_init_rtas_console();
1179 static arch_spinlock_t timebase_lock
;
1180 static u64 timebase
= 0;
1182 void rtas_give_timebase(void)
1184 unsigned long flags
;
1186 local_irq_save(flags
);
1188 arch_spin_lock(&timebase_lock
);
1189 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL
);
1190 timebase
= get_tb();
1191 arch_spin_unlock(&timebase_lock
);
1195 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL
);
1196 local_irq_restore(flags
);
1199 void rtas_take_timebase(void)
1203 arch_spin_lock(&timebase_lock
);
1204 set_tb(timebase
>> 32, timebase
& 0xffffffff);
1206 arch_spin_unlock(&timebase_lock
);