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>
29 #include <linux/syscalls.h>
33 #include <asm/hvcall.h>
34 #include <asm/machdep.h>
35 #include <asm/firmware.h>
37 #include <asm/param.h>
38 #include <asm/delay.h>
39 #include <linux/uaccess.h>
41 #include <asm/syscalls.h>
43 #include <linux/atomic.h>
46 #include <asm/topology.h>
48 /* This is here deliberately so it's only used in this file */
49 void enter_rtas(unsigned long);
51 struct rtas_t rtas
= {
52 .lock
= __ARCH_SPIN_LOCK_UNLOCKED
56 DEFINE_SPINLOCK(rtas_data_buf_lock
);
57 EXPORT_SYMBOL(rtas_data_buf_lock
);
59 char rtas_data_buf
[RTAS_DATA_BUF_SIZE
] __cacheline_aligned
;
60 EXPORT_SYMBOL(rtas_data_buf
);
62 unsigned long rtas_rmo_buf
;
65 * If non-NULL, this gets called when the kernel terminates.
66 * This is done like this so rtas_flash can be a module.
68 void (*rtas_flash_term_hook
)(int);
69 EXPORT_SYMBOL(rtas_flash_term_hook
);
71 /* RTAS use home made raw locking instead of spin_lock_irqsave
72 * because those can be called from within really nasty contexts
73 * such as having the timebase stopped which would lockup with
74 * normal locks and spinlock debugging enabled
76 static unsigned long lock_rtas(void)
80 local_irq_save(flags
);
82 arch_spin_lock(&rtas
.lock
);
86 static void unlock_rtas(unsigned long flags
)
88 arch_spin_unlock(&rtas
.lock
);
89 local_irq_restore(flags
);
94 * call_rtas_display_status and call_rtas_display_status_delay
95 * are designed only for very early low-level debugging, which
96 * is why the token is hard-coded to 10.
98 static void call_rtas_display_status(unsigned char c
)
106 rtas_call_unlocked(&rtas
.args
, 10, 1, 1, NULL
, c
);
110 static void call_rtas_display_status_delay(char c
)
112 static int pending_newline
= 0; /* did last write end with unprinted newline? */
113 static int width
= 16;
117 call_rtas_display_status(' ');
122 if (pending_newline
) {
123 call_rtas_display_status('\r');
124 call_rtas_display_status('\n');
128 call_rtas_display_status(c
);
134 void __init
udbg_init_rtas_panel(void)
136 udbg_putc
= call_rtas_display_status_delay
;
139 #ifdef CONFIG_UDBG_RTAS_CONSOLE
141 /* If you think you're dying before early_init_dt_scan_rtas() does its
142 * work, you can hard code the token values for your firmware here and
143 * hardcode rtas.base/entry etc.
145 static unsigned int rtas_putchar_token
= RTAS_UNKNOWN_SERVICE
;
146 static unsigned int rtas_getchar_token
= RTAS_UNKNOWN_SERVICE
;
148 static void udbg_rtascon_putc(char c
)
155 /* Add CRs before LFs */
157 udbg_rtascon_putc('\r');
159 /* if there is more than one character to be displayed, wait a bit */
160 for (tries
= 0; tries
< 16; tries
++) {
161 if (rtas_call(rtas_putchar_token
, 1, 1, NULL
, c
) == 0)
167 static int udbg_rtascon_getc_poll(void)
174 if (rtas_call(rtas_getchar_token
, 0, 2, &c
))
180 static int udbg_rtascon_getc(void)
184 while ((c
= udbg_rtascon_getc_poll()) == -1)
191 void __init
udbg_init_rtas_console(void)
193 udbg_putc
= udbg_rtascon_putc
;
194 udbg_getc
= udbg_rtascon_getc
;
195 udbg_getc_poll
= udbg_rtascon_getc_poll
;
197 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
199 void rtas_progress(char *s
, unsigned short hex
)
201 struct device_node
*root
;
205 static int display_character
, set_indicator
;
206 static int display_width
, display_lines
, form_feed
;
207 static const int *row_width
;
208 static DEFINE_SPINLOCK(progress_lock
);
209 static int current_line
;
210 static int pending_newline
= 0; /* did last write end with unprinted newline? */
215 if (display_width
== 0) {
216 display_width
= 0x10;
217 if ((root
= of_find_node_by_path("/rtas"))) {
218 if ((p
= of_get_property(root
,
219 "ibm,display-line-length", NULL
)))
220 display_width
= be32_to_cpu(*p
);
221 if ((p
= of_get_property(root
,
222 "ibm,form-feed", NULL
)))
223 form_feed
= be32_to_cpu(*p
);
224 if ((p
= of_get_property(root
,
225 "ibm,display-number-of-lines", NULL
)))
226 display_lines
= be32_to_cpu(*p
);
227 row_width
= of_get_property(root
,
228 "ibm,display-truncation-length", NULL
);
231 display_character
= rtas_token("display-character");
232 set_indicator
= rtas_token("set-indicator");
235 if (display_character
== RTAS_UNKNOWN_SERVICE
) {
236 /* use hex display if available */
237 if (set_indicator
!= RTAS_UNKNOWN_SERVICE
)
238 rtas_call(set_indicator
, 3, 1, NULL
, 6, 0, hex
);
242 spin_lock(&progress_lock
);
245 * Last write ended with newline, but we didn't print it since
246 * it would just clear the bottom line of output. Print it now
249 * If no newline is pending and form feed is supported, clear the
250 * display with a form feed; otherwise, print a CR to start output
251 * at the beginning of the line.
253 if (pending_newline
) {
254 rtas_call(display_character
, 1, 1, NULL
, '\r');
255 rtas_call(display_character
, 1, 1, NULL
, '\n');
260 rtas_call(display_character
, 1, 1, NULL
,
263 rtas_call(display_character
, 1, 1, NULL
, '\r');
267 width
= row_width
[current_line
];
269 width
= display_width
;
272 if (*os
== '\n' || *os
== '\r') {
273 /* If newline is the last character, save it
274 * until next call to avoid bumping up the
277 if (*os
== '\n' && !os
[1]) {
280 if (current_line
> display_lines
-1)
281 current_line
= display_lines
-1;
282 spin_unlock(&progress_lock
);
286 /* RTAS wants CR-LF, not just LF */
289 rtas_call(display_character
, 1, 1, NULL
, '\r');
290 rtas_call(display_character
, 1, 1, NULL
, '\n');
292 /* CR might be used to re-draw a line, so we'll
293 * leave it alone and not add LF.
295 rtas_call(display_character
, 1, 1, NULL
, *os
);
299 width
= row_width
[current_line
];
301 width
= display_width
;
304 rtas_call(display_character
, 1, 1, NULL
, *os
);
309 /* if we overwrite the screen length */
311 while ((*os
!= 0) && (*os
!= '\n') && (*os
!= '\r'))
315 spin_unlock(&progress_lock
);
317 EXPORT_SYMBOL(rtas_progress
); /* needed by rtas_flash module */
319 int rtas_token(const char *service
)
322 if (rtas
.dev
== NULL
)
323 return RTAS_UNKNOWN_SERVICE
;
324 tokp
= of_get_property(rtas
.dev
, service
, NULL
);
325 return tokp
? be32_to_cpu(*tokp
) : RTAS_UNKNOWN_SERVICE
;
327 EXPORT_SYMBOL(rtas_token
);
329 int rtas_service_present(const char *service
)
331 return rtas_token(service
) != RTAS_UNKNOWN_SERVICE
;
333 EXPORT_SYMBOL(rtas_service_present
);
335 #ifdef CONFIG_RTAS_ERROR_LOGGING
337 * Return the firmware-specified size of the error log buffer
338 * for all rtas calls that require an error buffer argument.
339 * This includes 'check-exception' and 'rtas-last-error'.
341 int rtas_get_error_log_max(void)
343 static int rtas_error_log_max
;
344 if (rtas_error_log_max
)
345 return rtas_error_log_max
;
347 rtas_error_log_max
= rtas_token ("rtas-error-log-max");
348 if ((rtas_error_log_max
== RTAS_UNKNOWN_SERVICE
) ||
349 (rtas_error_log_max
> RTAS_ERROR_LOG_MAX
)) {
350 printk (KERN_WARNING
"RTAS: bad log buffer size %d\n",
352 rtas_error_log_max
= RTAS_ERROR_LOG_MAX
;
354 return rtas_error_log_max
;
356 EXPORT_SYMBOL(rtas_get_error_log_max
);
359 static char rtas_err_buf
[RTAS_ERROR_LOG_MAX
];
360 static int rtas_last_error_token
;
362 /** Return a copy of the detailed error text associated with the
363 * most recent failed call to rtas. Because the error text
364 * might go stale if there are any other intervening rtas calls,
365 * this routine must be called atomically with whatever produced
366 * the error (i.e. with rtas.lock still held from the previous call).
368 static char *__fetch_rtas_last_error(char *altbuf
)
370 struct rtas_args err_args
, save_args
;
374 if (rtas_last_error_token
== -1)
377 bufsz
= rtas_get_error_log_max();
379 err_args
.token
= cpu_to_be32(rtas_last_error_token
);
380 err_args
.nargs
= cpu_to_be32(2);
381 err_args
.nret
= cpu_to_be32(1);
382 err_args
.args
[0] = cpu_to_be32(__pa(rtas_err_buf
));
383 err_args
.args
[1] = cpu_to_be32(bufsz
);
384 err_args
.args
[2] = 0;
386 save_args
= rtas
.args
;
387 rtas
.args
= err_args
;
389 enter_rtas(__pa(&rtas
.args
));
391 err_args
= rtas
.args
;
392 rtas
.args
= save_args
;
394 /* Log the error in the unlikely case that there was one. */
395 if (unlikely(err_args
.args
[2] == 0)) {
400 if (slab_is_available())
401 buf
= kmalloc(RTAS_ERROR_LOG_MAX
, GFP_ATOMIC
);
404 memcpy(buf
, rtas_err_buf
, RTAS_ERROR_LOG_MAX
);
410 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
412 #else /* CONFIG_RTAS_ERROR_LOGGING */
413 #define __fetch_rtas_last_error(x) NULL
414 #define get_errorlog_buffer() NULL
419 va_rtas_call_unlocked(struct rtas_args
*args
, int token
, int nargs
, int nret
,
424 args
->token
= cpu_to_be32(token
);
425 args
->nargs
= cpu_to_be32(nargs
);
426 args
->nret
= cpu_to_be32(nret
);
427 args
->rets
= &(args
->args
[nargs
]);
429 for (i
= 0; i
< nargs
; ++i
)
430 args
->args
[i
] = cpu_to_be32(va_arg(list
, __u32
));
432 for (i
= 0; i
< nret
; ++i
)
435 enter_rtas(__pa(args
));
438 void rtas_call_unlocked(struct rtas_args
*args
, int token
, int nargs
, int nret
, ...)
442 va_start(list
, nret
);
443 va_rtas_call_unlocked(args
, token
, nargs
, nret
, list
);
447 int rtas_call(int token
, int nargs
, int nret
, int *outputs
, ...)
452 struct rtas_args
*rtas_args
;
453 char *buff_copy
= NULL
;
456 if (!rtas
.entry
|| token
== RTAS_UNKNOWN_SERVICE
)
461 /* We use the global rtas args buffer */
462 rtas_args
= &rtas
.args
;
464 va_start(list
, outputs
);
465 va_rtas_call_unlocked(rtas_args
, token
, nargs
, nret
, list
);
468 /* A -1 return code indicates that the last command couldn't
469 be completed due to a hardware error. */
470 if (be32_to_cpu(rtas_args
->rets
[0]) == -1)
471 buff_copy
= __fetch_rtas_last_error(NULL
);
473 if (nret
> 1 && outputs
!= NULL
)
474 for (i
= 0; i
< nret
-1; ++i
)
475 outputs
[i
] = be32_to_cpu(rtas_args
->rets
[i
+1]);
476 ret
= (nret
> 0)? be32_to_cpu(rtas_args
->rets
[0]): 0;
481 log_error(buff_copy
, ERR_TYPE_RTAS_LOG
, 0);
482 if (slab_is_available())
487 EXPORT_SYMBOL(rtas_call
);
489 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
490 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
492 unsigned int rtas_busy_delay_time(int status
)
497 if (status
== RTAS_BUSY
) {
499 } else if (status
>= RTAS_EXTENDED_DELAY_MIN
&&
500 status
<= RTAS_EXTENDED_DELAY_MAX
) {
501 order
= status
- RTAS_EXTENDED_DELAY_MIN
;
502 for (ms
= 1; order
> 0; order
--)
508 EXPORT_SYMBOL(rtas_busy_delay_time
);
510 /* For an RTAS busy status code, perform the hinted delay. */
511 unsigned int rtas_busy_delay(int status
)
516 ms
= rtas_busy_delay_time(status
);
517 if (ms
&& need_resched())
522 EXPORT_SYMBOL(rtas_busy_delay
);
524 static int rtas_error_rc(int rtas_rc
)
529 case -1: /* Hardware Error */
532 case -3: /* Bad indicator/domain/etc */
535 case -9000: /* Isolation error */
538 case -9001: /* Outstanding TCE/PTE */
541 case -9002: /* No usable slot */
545 printk(KERN_ERR
"%s: unexpected RTAS error %d\n",
553 int rtas_get_power_level(int powerdomain
, int *level
)
555 int token
= rtas_token("get-power-level");
558 if (token
== RTAS_UNKNOWN_SERVICE
)
561 while ((rc
= rtas_call(token
, 1, 2, level
, powerdomain
)) == RTAS_BUSY
)
565 return rtas_error_rc(rc
);
568 EXPORT_SYMBOL(rtas_get_power_level
);
570 int rtas_set_power_level(int powerdomain
, int level
, int *setlevel
)
572 int token
= rtas_token("set-power-level");
575 if (token
== RTAS_UNKNOWN_SERVICE
)
579 rc
= rtas_call(token
, 2, 2, setlevel
, powerdomain
, level
);
580 } while (rtas_busy_delay(rc
));
583 return rtas_error_rc(rc
);
586 EXPORT_SYMBOL(rtas_set_power_level
);
588 int rtas_get_sensor(int sensor
, int index
, int *state
)
590 int token
= rtas_token("get-sensor-state");
593 if (token
== RTAS_UNKNOWN_SERVICE
)
597 rc
= rtas_call(token
, 2, 2, state
, sensor
, index
);
598 } while (rtas_busy_delay(rc
));
601 return rtas_error_rc(rc
);
604 EXPORT_SYMBOL(rtas_get_sensor
);
606 int rtas_get_sensor_fast(int sensor
, int index
, int *state
)
608 int token
= rtas_token("get-sensor-state");
611 if (token
== RTAS_UNKNOWN_SERVICE
)
614 rc
= rtas_call(token
, 2, 2, state
, sensor
, index
);
615 WARN_ON(rc
== RTAS_BUSY
|| (rc
>= RTAS_EXTENDED_DELAY_MIN
&&
616 rc
<= RTAS_EXTENDED_DELAY_MAX
));
619 return rtas_error_rc(rc
);
623 bool rtas_indicator_present(int token
, int *maxindex
)
625 int proplen
, count
, i
;
626 const struct indicator_elem
{
631 indicators
= of_get_property(rtas
.dev
, "rtas-indicators", &proplen
);
635 count
= proplen
/ sizeof(struct indicator_elem
);
637 for (i
= 0; i
< count
; i
++) {
638 if (__be32_to_cpu(indicators
[i
].token
) != token
)
641 *maxindex
= __be32_to_cpu(indicators
[i
].maxindex
);
647 EXPORT_SYMBOL(rtas_indicator_present
);
649 int rtas_set_indicator(int indicator
, int index
, int new_value
)
651 int token
= rtas_token("set-indicator");
654 if (token
== RTAS_UNKNOWN_SERVICE
)
658 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
659 } while (rtas_busy_delay(rc
));
662 return rtas_error_rc(rc
);
665 EXPORT_SYMBOL(rtas_set_indicator
);
668 * Ignoring RTAS extended delay
670 int rtas_set_indicator_fast(int indicator
, int index
, int new_value
)
673 int token
= rtas_token("set-indicator");
675 if (token
== RTAS_UNKNOWN_SERVICE
)
678 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
680 WARN_ON(rc
== RTAS_BUSY
|| (rc
>= RTAS_EXTENDED_DELAY_MIN
&&
681 rc
<= RTAS_EXTENDED_DELAY_MAX
));
684 return rtas_error_rc(rc
);
689 void __noreturn
rtas_restart(char *cmd
)
691 if (rtas_flash_term_hook
)
692 rtas_flash_term_hook(SYS_RESTART
);
693 printk("RTAS system-reboot returned %d\n",
694 rtas_call(rtas_token("system-reboot"), 0, 1, NULL
));
698 void rtas_power_off(void)
700 if (rtas_flash_term_hook
)
701 rtas_flash_term_hook(SYS_POWER_OFF
);
702 /* allow power on only with power button press */
703 printk("RTAS power-off returned %d\n",
704 rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1));
708 void __noreturn
rtas_halt(void)
710 if (rtas_flash_term_hook
)
711 rtas_flash_term_hook(SYS_HALT
);
712 /* allow power on only with power button press */
713 printk("RTAS power-off returned %d\n",
714 rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1));
718 /* Must be in the RMO region, so we place it here */
719 static char rtas_os_term_buf
[2048];
721 void rtas_os_term(char *str
)
726 * Firmware with the ibm,extended-os-term property is guaranteed
727 * to always return from an ibm,os-term call. Earlier versions without
728 * this property may terminate the partition which we want to avoid
729 * since it interferes with panic_timeout.
731 if (RTAS_UNKNOWN_SERVICE
== rtas_token("ibm,os-term") ||
732 RTAS_UNKNOWN_SERVICE
== rtas_token("ibm,extended-os-term"))
735 snprintf(rtas_os_term_buf
, 2048, "OS panic: %s", str
);
738 status
= rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL
,
739 __pa(rtas_os_term_buf
));
740 } while (rtas_busy_delay(status
));
743 printk(KERN_EMERG
"ibm,os-term call failed %d\n", status
);
746 static int ibm_suspend_me_token
= RTAS_UNKNOWN_SERVICE
;
747 #ifdef CONFIG_PPC_PSERIES
748 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
750 u16 slb_size
= mmu_slb_size
;
751 int rc
= H_MULTI_THREADS_ACTIVE
;
754 slb_set_size(SLB_MIN_SIZE
);
755 printk(KERN_DEBUG
"calling ibm,suspend-me on cpu %i\n", smp_processor_id());
757 while (rc
== H_MULTI_THREADS_ACTIVE
&& !atomic_read(&data
->done
) &&
758 !atomic_read(&data
->error
))
759 rc
= rtas_call(data
->token
, 0, 1, NULL
);
761 if (rc
|| atomic_read(&data
->error
)) {
762 printk(KERN_DEBUG
"ibm,suspend-me returned %d\n", rc
);
763 slb_set_size(slb_size
);
766 if (atomic_read(&data
->error
))
767 rc
= atomic_read(&data
->error
);
769 atomic_set(&data
->error
, rc
);
770 pSeries_coalesce_init();
772 if (wake_when_done
) {
773 atomic_set(&data
->done
, 1);
775 for_each_online_cpu(cpu
)
776 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
779 if (atomic_dec_return(&data
->working
) == 0)
780 complete(data
->complete
);
785 int rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
)
787 atomic_inc(&data
->working
);
788 return __rtas_suspend_last_cpu(data
, 0);
791 static int __rtas_suspend_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
794 unsigned long msr_save
;
797 atomic_inc(&data
->working
);
799 /* really need to ensure MSR.EE is off for H_JOIN */
801 mtmsr(msr_save
& ~(MSR_EE
));
803 while (rc
== H_SUCCESS
&& !atomic_read(&data
->done
) && !atomic_read(&data
->error
))
804 rc
= plpar_hcall_norets(H_JOIN
);
808 if (rc
== H_SUCCESS
) {
809 /* This cpu was prodded and the suspend is complete. */
811 } else if (rc
== H_CONTINUE
) {
812 /* All other cpus are in H_JOIN, this cpu does
815 return __rtas_suspend_last_cpu(data
, wake_when_done
);
817 printk(KERN_ERR
"H_JOIN on cpu %i failed with rc = %ld\n",
818 smp_processor_id(), rc
);
819 atomic_set(&data
->error
, rc
);
822 if (wake_when_done
) {
823 atomic_set(&data
->done
, 1);
825 /* This cpu did the suspend or got an error; in either case,
826 * we need to prod all other other cpus out of join state.
827 * Extra prods are harmless.
829 for_each_online_cpu(cpu
)
830 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
833 if (atomic_dec_return(&data
->working
) == 0)
834 complete(data
->complete
);
838 int rtas_suspend_cpu(struct rtas_suspend_me_data
*data
)
840 return __rtas_suspend_cpu(data
, 0);
843 static void rtas_percpu_suspend_me(void *info
)
845 __rtas_suspend_cpu((struct rtas_suspend_me_data
*)info
, 1);
848 enum rtas_cpu_state
{
854 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state
,
857 if (!cpumask_empty(cpus
)) {
864 /* On return cpumask will be altered to indicate CPUs changed.
865 * CPUs with states changed will be set in the mask,
866 * CPUs with status unchanged will be unset in the mask. */
867 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state
,
874 if (cpumask_empty(cpus
))
877 for_each_cpu(cpu
, cpus
) {
880 cpuret
= cpu_down(cpu
);
883 cpuret
= cpu_up(cpu
);
887 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
889 ((state
== UP
) ? "up" : "down"),
894 /* clear bits for unchanged cpus, return */
895 cpumask_shift_right(cpus
, cpus
, cpu
);
896 cpumask_shift_left(cpus
, cpus
, cpu
);
899 /* clear bit for unchanged cpu, continue */
900 cpumask_clear_cpu(cpu
, cpus
);
909 int rtas_online_cpus_mask(cpumask_var_t cpus
)
913 ret
= rtas_cpu_state_change_mask(UP
, cpus
);
916 cpumask_var_t tmp_mask
;
918 if (!alloc_cpumask_var(&tmp_mask
, GFP_KERNEL
))
921 /* Use tmp_mask to preserve cpus mask from first failure */
922 cpumask_copy(tmp_mask
, cpus
);
923 rtas_offline_cpus_mask(tmp_mask
);
924 free_cpumask_var(tmp_mask
);
929 EXPORT_SYMBOL(rtas_online_cpus_mask
);
931 int rtas_offline_cpus_mask(cpumask_var_t cpus
)
933 return rtas_cpu_state_change_mask(DOWN
, cpus
);
935 EXPORT_SYMBOL(rtas_offline_cpus_mask
);
937 int rtas_ibm_suspend_me(u64 handle
)
941 unsigned long retbuf
[PLPAR_HCALL_BUFSIZE
];
942 struct rtas_suspend_me_data data
;
943 DECLARE_COMPLETION_ONSTACK(done
);
944 cpumask_var_t offline_mask
;
947 if (!rtas_service_present("ibm,suspend-me"))
950 /* Make sure the state is valid */
951 rc
= plpar_hcall(H_VASI_STATE
, retbuf
, handle
);
956 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned %ld\n",rc
);
958 } else if (state
== H_VASI_ENABLED
) {
960 } else if (state
!= H_VASI_SUSPENDING
) {
961 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned state %ld\n",
966 if (!alloc_cpumask_var(&offline_mask
, GFP_KERNEL
))
969 atomic_set(&data
.working
, 0);
970 atomic_set(&data
.done
, 0);
971 atomic_set(&data
.error
, 0);
972 data
.token
= rtas_token("ibm,suspend-me");
973 data
.complete
= &done
;
975 /* All present CPUs must be online */
976 cpumask_andnot(offline_mask
, cpu_present_mask
, cpu_online_mask
);
977 cpuret
= rtas_online_cpus_mask(offline_mask
);
979 pr_err("%s: Could not bring present CPUs online.\n", __func__
);
980 atomic_set(&data
.error
, cpuret
);
984 stop_topology_update();
986 /* Call function on all CPUs. One of us will make the
989 if (on_each_cpu(rtas_percpu_suspend_me
, &data
, 0))
990 atomic_set(&data
.error
, -EINVAL
);
992 wait_for_completion(&done
);
994 if (atomic_read(&data
.error
) != 0)
995 printk(KERN_ERR
"Error doing global join\n");
997 start_topology_update();
999 /* Take down CPUs not online prior to suspend */
1000 cpuret
= rtas_offline_cpus_mask(offline_mask
);
1002 pr_warn("%s: Could not restore CPUs to offline state.\n",
1006 free_cpumask_var(offline_mask
);
1007 return atomic_read(&data
.error
);
1009 #else /* CONFIG_PPC_PSERIES */
1010 int rtas_ibm_suspend_me(u64 handle
)
1017 * Find a specific pseries error log in an RTAS extended event log.
1018 * @log: RTAS error/event log
1019 * @section_id: two character section identifier
1021 * Returns a pointer to the specified errorlog or NULL if not found.
1023 struct pseries_errorlog
*get_pseries_errorlog(struct rtas_error_log
*log
,
1024 uint16_t section_id
)
1026 struct rtas_ext_event_log_v6
*ext_log
=
1027 (struct rtas_ext_event_log_v6
*)log
->buffer
;
1028 struct pseries_errorlog
*sect
;
1029 unsigned char *p
, *log_end
;
1030 uint32_t ext_log_length
= rtas_error_extended_log_length(log
);
1031 uint8_t log_format
= rtas_ext_event_log_format(ext_log
);
1032 uint32_t company_id
= rtas_ext_event_company_id(ext_log
);
1034 /* Check that we understand the format */
1035 if (ext_log_length
< sizeof(struct rtas_ext_event_log_v6
) ||
1036 log_format
!= RTAS_V6EXT_LOG_FORMAT_EVENT_LOG
||
1037 company_id
!= RTAS_V6EXT_COMPANY_ID_IBM
)
1040 log_end
= log
->buffer
+ ext_log_length
;
1041 p
= ext_log
->vendor_log
;
1043 while (p
< log_end
) {
1044 sect
= (struct pseries_errorlog
*)p
;
1045 if (pseries_errorlog_id(sect
) == section_id
)
1047 p
+= pseries_errorlog_length(sect
);
1053 /* We assume to be passed big endian arguments */
1054 SYSCALL_DEFINE1(rtas
, struct rtas_args __user
*, uargs
)
1056 struct rtas_args args
;
1057 unsigned long flags
;
1058 char *buff_copy
, *errbuf
= NULL
;
1059 int nargs
, nret
, token
;
1061 if (!capable(CAP_SYS_ADMIN
))
1067 if (copy_from_user(&args
, uargs
, 3 * sizeof(u32
)) != 0)
1070 nargs
= be32_to_cpu(args
.nargs
);
1071 nret
= be32_to_cpu(args
.nret
);
1072 token
= be32_to_cpu(args
.token
);
1074 if (nargs
>= ARRAY_SIZE(args
.args
)
1075 || nret
> ARRAY_SIZE(args
.args
)
1076 || nargs
+ nret
> ARRAY_SIZE(args
.args
))
1080 if (copy_from_user(args
.args
, uargs
->args
,
1081 nargs
* sizeof(rtas_arg_t
)) != 0)
1084 if (token
== RTAS_UNKNOWN_SERVICE
)
1087 args
.rets
= &args
.args
[nargs
];
1088 memset(args
.rets
, 0, nret
* sizeof(rtas_arg_t
));
1090 /* Need to handle ibm,suspend_me call specially */
1091 if (token
== ibm_suspend_me_token
) {
1094 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1095 * endian, or at least the hcall within it requires it.
1098 u64 handle
= ((u64
)be32_to_cpu(args
.args
[0]) << 32)
1099 | be32_to_cpu(args
.args
[1]);
1100 rc
= rtas_ibm_suspend_me(handle
);
1102 args
.rets
[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE
);
1103 else if (rc
== -EIO
)
1104 args
.rets
[0] = cpu_to_be32(-1);
1110 buff_copy
= get_errorlog_buffer();
1112 flags
= lock_rtas();
1115 enter_rtas(__pa(&rtas
.args
));
1118 /* A -1 return code indicates that the last command couldn't
1119 be completed due to a hardware error. */
1120 if (be32_to_cpu(args
.rets
[0]) == -1)
1121 errbuf
= __fetch_rtas_last_error(buff_copy
);
1127 log_error(errbuf
, ERR_TYPE_RTAS_LOG
, 0);
1132 /* Copy out args. */
1133 if (copy_to_user(uargs
->args
+ nargs
,
1135 nret
* sizeof(rtas_arg_t
)) != 0)
1142 * Call early during boot, before mem init, to retrieve the RTAS
1143 * information from the device-tree and allocate the RMO buffer for userland
1146 void __init
rtas_initialize(void)
1148 unsigned long rtas_region
= RTAS_INSTANTIATE_MAX
;
1149 u32 base
, size
, entry
;
1150 int no_base
, no_size
, no_entry
;
1152 /* Get RTAS dev node and fill up our "rtas" structure with infos
1155 rtas
.dev
= of_find_node_by_name(NULL
, "rtas");
1159 no_base
= of_property_read_u32(rtas
.dev
, "linux,rtas-base", &base
);
1160 no_size
= of_property_read_u32(rtas
.dev
, "rtas-size", &size
);
1161 if (no_base
|| no_size
) {
1162 of_node_put(rtas
.dev
);
1169 no_entry
= of_property_read_u32(rtas
.dev
, "linux,rtas-entry", &entry
);
1170 rtas
.entry
= no_entry
? rtas
.base
: entry
;
1172 /* If RTAS was found, allocate the RMO buffer for it and look for
1173 * the stop-self token if any
1176 if (firmware_has_feature(FW_FEATURE_LPAR
)) {
1177 rtas_region
= min(ppc64_rma_size
, RTAS_INSTANTIATE_MAX
);
1178 ibm_suspend_me_token
= rtas_token("ibm,suspend-me");
1181 rtas_rmo_buf
= memblock_alloc_base(RTAS_RMOBUF_MAX
, PAGE_SIZE
, rtas_region
);
1183 #ifdef CONFIG_RTAS_ERROR_LOGGING
1184 rtas_last_error_token
= rtas_token("rtas-last-error");
1188 int __init
early_init_dt_scan_rtas(unsigned long node
,
1189 const char *uname
, int depth
, void *data
)
1191 const u32
*basep
, *entryp
, *sizep
;
1193 if (depth
!= 1 || strcmp(uname
, "rtas") != 0)
1196 basep
= of_get_flat_dt_prop(node
, "linux,rtas-base", NULL
);
1197 entryp
= of_get_flat_dt_prop(node
, "linux,rtas-entry", NULL
);
1198 sizep
= of_get_flat_dt_prop(node
, "rtas-size", NULL
);
1200 if (basep
&& entryp
&& sizep
) {
1202 rtas
.entry
= *entryp
;
1206 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1207 basep
= of_get_flat_dt_prop(node
, "put-term-char", NULL
);
1209 rtas_putchar_token
= *basep
;
1211 basep
= of_get_flat_dt_prop(node
, "get-term-char", NULL
);
1213 rtas_getchar_token
= *basep
;
1215 if (rtas_putchar_token
!= RTAS_UNKNOWN_SERVICE
&&
1216 rtas_getchar_token
!= RTAS_UNKNOWN_SERVICE
)
1217 udbg_init_rtas_console();
1225 static arch_spinlock_t timebase_lock
;
1226 static u64 timebase
= 0;
1228 void rtas_give_timebase(void)
1230 unsigned long flags
;
1232 local_irq_save(flags
);
1234 arch_spin_lock(&timebase_lock
);
1235 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL
);
1236 timebase
= get_tb();
1237 arch_spin_unlock(&timebase_lock
);
1241 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL
);
1242 local_irq_restore(flags
);
1245 void rtas_take_timebase(void)
1249 arch_spin_lock(&timebase_lock
);
1250 set_tb(timebase
>> 32, timebase
& 0xffffffff);
1252 arch_spin_unlock(&timebase_lock
);