1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Procedures for interfacing to the RTAS on CHRP machines.
6 * Peter Bergner, IBM March 2001.
7 * Copyright (C) 2001 IBM.
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/spinlock.h>
14 #include <linux/export.h>
15 #include <linux/init.h>
16 #include <linux/capability.h>
17 #include <linux/delay.h>
18 #include <linux/cpu.h>
19 #include <linux/smp.h>
20 #include <linux/completion.h>
21 #include <linux/cpumask.h>
22 #include <linux/memblock.h>
23 #include <linux/slab.h>
24 #include <linux/reboot.h>
25 #include <linux/syscalls.h>
29 #include <asm/hvcall.h>
30 #include <asm/machdep.h>
31 #include <asm/firmware.h>
33 #include <asm/param.h>
34 #include <asm/delay.h>
35 #include <linux/uaccess.h>
37 #include <asm/syscalls.h>
39 #include <linux/atomic.h>
42 #include <asm/topology.h>
44 /* This is here deliberately so it's only used in this file */
45 void enter_rtas(unsigned long);
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(&rtas
.lock
);
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
)
102 rtas_call_unlocked(&rtas
.args
, 10, 1, 1, NULL
, c
);
106 static void call_rtas_display_status_delay(char c
)
108 static int pending_newline
= 0; /* did last write end with unprinted newline? */
109 static int width
= 16;
113 call_rtas_display_status(' ');
118 if (pending_newline
) {
119 call_rtas_display_status('\r');
120 call_rtas_display_status('\n');
124 call_rtas_display_status(c
);
130 void __init
udbg_init_rtas_panel(void)
132 udbg_putc
= call_rtas_display_status_delay
;
135 #ifdef CONFIG_UDBG_RTAS_CONSOLE
137 /* If you think you're dying before early_init_dt_scan_rtas() does its
138 * work, you can hard code the token values for your firmware here and
139 * hardcode rtas.base/entry etc.
141 static unsigned int rtas_putchar_token
= RTAS_UNKNOWN_SERVICE
;
142 static unsigned int rtas_getchar_token
= RTAS_UNKNOWN_SERVICE
;
144 static void udbg_rtascon_putc(char c
)
151 /* Add CRs before LFs */
153 udbg_rtascon_putc('\r');
155 /* if there is more than one character to be displayed, wait a bit */
156 for (tries
= 0; tries
< 16; tries
++) {
157 if (rtas_call(rtas_putchar_token
, 1, 1, NULL
, c
) == 0)
163 static int udbg_rtascon_getc_poll(void)
170 if (rtas_call(rtas_getchar_token
, 0, 2, &c
))
176 static int udbg_rtascon_getc(void)
180 while ((c
= udbg_rtascon_getc_poll()) == -1)
187 void __init
udbg_init_rtas_console(void)
189 udbg_putc
= udbg_rtascon_putc
;
190 udbg_getc
= udbg_rtascon_getc
;
191 udbg_getc_poll
= udbg_rtascon_getc_poll
;
193 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
195 void rtas_progress(char *s
, unsigned short hex
)
197 struct device_node
*root
;
201 static int display_character
, set_indicator
;
202 static int display_width
, display_lines
, form_feed
;
203 static const int *row_width
;
204 static DEFINE_SPINLOCK(progress_lock
);
205 static int current_line
;
206 static int pending_newline
= 0; /* did last write end with unprinted newline? */
211 if (display_width
== 0) {
212 display_width
= 0x10;
213 if ((root
= of_find_node_by_path("/rtas"))) {
214 if ((p
= of_get_property(root
,
215 "ibm,display-line-length", NULL
)))
216 display_width
= be32_to_cpu(*p
);
217 if ((p
= of_get_property(root
,
218 "ibm,form-feed", NULL
)))
219 form_feed
= be32_to_cpu(*p
);
220 if ((p
= of_get_property(root
,
221 "ibm,display-number-of-lines", NULL
)))
222 display_lines
= be32_to_cpu(*p
);
223 row_width
= of_get_property(root
,
224 "ibm,display-truncation-length", NULL
);
227 display_character
= rtas_token("display-character");
228 set_indicator
= rtas_token("set-indicator");
231 if (display_character
== RTAS_UNKNOWN_SERVICE
) {
232 /* use hex display if available */
233 if (set_indicator
!= RTAS_UNKNOWN_SERVICE
)
234 rtas_call(set_indicator
, 3, 1, NULL
, 6, 0, hex
);
238 spin_lock(&progress_lock
);
241 * Last write ended with newline, but we didn't print it since
242 * it would just clear the bottom line of output. Print it now
245 * If no newline is pending and form feed is supported, clear the
246 * display with a form feed; otherwise, print a CR to start output
247 * at the beginning of the line.
249 if (pending_newline
) {
250 rtas_call(display_character
, 1, 1, NULL
, '\r');
251 rtas_call(display_character
, 1, 1, NULL
, '\n');
256 rtas_call(display_character
, 1, 1, NULL
,
259 rtas_call(display_character
, 1, 1, NULL
, '\r');
263 width
= row_width
[current_line
];
265 width
= display_width
;
268 if (*os
== '\n' || *os
== '\r') {
269 /* If newline is the last character, save it
270 * until next call to avoid bumping up the
273 if (*os
== '\n' && !os
[1]) {
276 if (current_line
> display_lines
-1)
277 current_line
= display_lines
-1;
278 spin_unlock(&progress_lock
);
282 /* RTAS wants CR-LF, not just LF */
285 rtas_call(display_character
, 1, 1, NULL
, '\r');
286 rtas_call(display_character
, 1, 1, NULL
, '\n');
288 /* CR might be used to re-draw a line, so we'll
289 * leave it alone and not add LF.
291 rtas_call(display_character
, 1, 1, NULL
, *os
);
295 width
= row_width
[current_line
];
297 width
= display_width
;
300 rtas_call(display_character
, 1, 1, NULL
, *os
);
305 /* if we overwrite the screen length */
307 while ((*os
!= 0) && (*os
!= '\n') && (*os
!= '\r'))
311 spin_unlock(&progress_lock
);
313 EXPORT_SYMBOL(rtas_progress
); /* needed by rtas_flash module */
315 int rtas_token(const char *service
)
318 if (rtas
.dev
== NULL
)
319 return RTAS_UNKNOWN_SERVICE
;
320 tokp
= of_get_property(rtas
.dev
, service
, NULL
);
321 return tokp
? be32_to_cpu(*tokp
) : RTAS_UNKNOWN_SERVICE
;
323 EXPORT_SYMBOL(rtas_token
);
325 int rtas_service_present(const char *service
)
327 return rtas_token(service
) != RTAS_UNKNOWN_SERVICE
;
329 EXPORT_SYMBOL(rtas_service_present
);
331 #ifdef CONFIG_RTAS_ERROR_LOGGING
333 * Return the firmware-specified size of the error log buffer
334 * for all rtas calls that require an error buffer argument.
335 * This includes 'check-exception' and 'rtas-last-error'.
337 int rtas_get_error_log_max(void)
339 static int rtas_error_log_max
;
340 if (rtas_error_log_max
)
341 return rtas_error_log_max
;
343 rtas_error_log_max
= rtas_token ("rtas-error-log-max");
344 if ((rtas_error_log_max
== RTAS_UNKNOWN_SERVICE
) ||
345 (rtas_error_log_max
> RTAS_ERROR_LOG_MAX
)) {
346 printk (KERN_WARNING
"RTAS: bad log buffer size %d\n",
348 rtas_error_log_max
= RTAS_ERROR_LOG_MAX
;
350 return rtas_error_log_max
;
352 EXPORT_SYMBOL(rtas_get_error_log_max
);
355 static char rtas_err_buf
[RTAS_ERROR_LOG_MAX
];
356 static int rtas_last_error_token
;
358 /** Return a copy of the detailed error text associated with the
359 * most recent failed call to rtas. Because the error text
360 * might go stale if there are any other intervening rtas calls,
361 * this routine must be called atomically with whatever produced
362 * the error (i.e. with rtas.lock still held from the previous call).
364 static char *__fetch_rtas_last_error(char *altbuf
)
366 struct rtas_args err_args
, save_args
;
370 if (rtas_last_error_token
== -1)
373 bufsz
= rtas_get_error_log_max();
375 err_args
.token
= cpu_to_be32(rtas_last_error_token
);
376 err_args
.nargs
= cpu_to_be32(2);
377 err_args
.nret
= cpu_to_be32(1);
378 err_args
.args
[0] = cpu_to_be32(__pa(rtas_err_buf
));
379 err_args
.args
[1] = cpu_to_be32(bufsz
);
380 err_args
.args
[2] = 0;
382 save_args
= rtas
.args
;
383 rtas
.args
= err_args
;
385 enter_rtas(__pa(&rtas
.args
));
387 err_args
= rtas
.args
;
388 rtas
.args
= save_args
;
390 /* Log the error in the unlikely case that there was one. */
391 if (unlikely(err_args
.args
[2] == 0)) {
396 if (slab_is_available())
397 buf
= kmalloc(RTAS_ERROR_LOG_MAX
, GFP_ATOMIC
);
400 memcpy(buf
, rtas_err_buf
, RTAS_ERROR_LOG_MAX
);
406 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
408 #else /* CONFIG_RTAS_ERROR_LOGGING */
409 #define __fetch_rtas_last_error(x) NULL
410 #define get_errorlog_buffer() NULL
415 va_rtas_call_unlocked(struct rtas_args
*args
, int token
, int nargs
, int nret
,
420 args
->token
= cpu_to_be32(token
);
421 args
->nargs
= cpu_to_be32(nargs
);
422 args
->nret
= cpu_to_be32(nret
);
423 args
->rets
= &(args
->args
[nargs
]);
425 for (i
= 0; i
< nargs
; ++i
)
426 args
->args
[i
] = cpu_to_be32(va_arg(list
, __u32
));
428 for (i
= 0; i
< nret
; ++i
)
431 enter_rtas(__pa(args
));
434 void rtas_call_unlocked(struct rtas_args
*args
, int token
, int nargs
, int nret
, ...)
438 va_start(list
, nret
);
439 va_rtas_call_unlocked(args
, token
, nargs
, nret
, list
);
443 int rtas_call(int token
, int nargs
, int nret
, int *outputs
, ...)
448 struct rtas_args
*rtas_args
;
449 char *buff_copy
= NULL
;
452 if (!rtas
.entry
|| token
== RTAS_UNKNOWN_SERVICE
)
457 /* We use the global rtas args buffer */
458 rtas_args
= &rtas
.args
;
460 va_start(list
, outputs
);
461 va_rtas_call_unlocked(rtas_args
, token
, nargs
, nret
, list
);
464 /* A -1 return code indicates that the last command couldn't
465 be completed due to a hardware error. */
466 if (be32_to_cpu(rtas_args
->rets
[0]) == -1)
467 buff_copy
= __fetch_rtas_last_error(NULL
);
469 if (nret
> 1 && outputs
!= NULL
)
470 for (i
= 0; i
< nret
-1; ++i
)
471 outputs
[i
] = be32_to_cpu(rtas_args
->rets
[i
+1]);
472 ret
= (nret
> 0)? be32_to_cpu(rtas_args
->rets
[0]): 0;
477 log_error(buff_copy
, ERR_TYPE_RTAS_LOG
, 0);
478 if (slab_is_available())
483 EXPORT_SYMBOL(rtas_call
);
485 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
486 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
488 unsigned int rtas_busy_delay_time(int status
)
493 if (status
== RTAS_BUSY
) {
495 } else if (status
>= RTAS_EXTENDED_DELAY_MIN
&&
496 status
<= RTAS_EXTENDED_DELAY_MAX
) {
497 order
= status
- RTAS_EXTENDED_DELAY_MIN
;
498 for (ms
= 1; order
> 0; order
--)
504 EXPORT_SYMBOL(rtas_busy_delay_time
);
506 /* For an RTAS busy status code, perform the hinted delay. */
507 unsigned int rtas_busy_delay(int status
)
512 ms
= rtas_busy_delay_time(status
);
513 if (ms
&& need_resched())
518 EXPORT_SYMBOL(rtas_busy_delay
);
520 static int rtas_error_rc(int rtas_rc
)
525 case -1: /* Hardware Error */
528 case -3: /* Bad indicator/domain/etc */
531 case -9000: /* Isolation error */
534 case -9001: /* Outstanding TCE/PTE */
537 case -9002: /* No usable slot */
541 printk(KERN_ERR
"%s: unexpected RTAS error %d\n",
549 int rtas_get_power_level(int powerdomain
, int *level
)
551 int token
= rtas_token("get-power-level");
554 if (token
== RTAS_UNKNOWN_SERVICE
)
557 while ((rc
= rtas_call(token
, 1, 2, level
, powerdomain
)) == RTAS_BUSY
)
561 return rtas_error_rc(rc
);
564 EXPORT_SYMBOL(rtas_get_power_level
);
566 int rtas_set_power_level(int powerdomain
, int level
, int *setlevel
)
568 int token
= rtas_token("set-power-level");
571 if (token
== RTAS_UNKNOWN_SERVICE
)
575 rc
= rtas_call(token
, 2, 2, setlevel
, powerdomain
, level
);
576 } while (rtas_busy_delay(rc
));
579 return rtas_error_rc(rc
);
582 EXPORT_SYMBOL(rtas_set_power_level
);
584 int rtas_get_sensor(int sensor
, int index
, int *state
)
586 int token
= rtas_token("get-sensor-state");
589 if (token
== RTAS_UNKNOWN_SERVICE
)
593 rc
= rtas_call(token
, 2, 2, state
, sensor
, index
);
594 } while (rtas_busy_delay(rc
));
597 return rtas_error_rc(rc
);
600 EXPORT_SYMBOL(rtas_get_sensor
);
602 int rtas_get_sensor_fast(int sensor
, int index
, int *state
)
604 int token
= rtas_token("get-sensor-state");
607 if (token
== RTAS_UNKNOWN_SERVICE
)
610 rc
= rtas_call(token
, 2, 2, state
, sensor
, index
);
611 WARN_ON(rc
== RTAS_BUSY
|| (rc
>= RTAS_EXTENDED_DELAY_MIN
&&
612 rc
<= RTAS_EXTENDED_DELAY_MAX
));
615 return rtas_error_rc(rc
);
619 bool rtas_indicator_present(int token
, int *maxindex
)
621 int proplen
, count
, i
;
622 const struct indicator_elem
{
627 indicators
= of_get_property(rtas
.dev
, "rtas-indicators", &proplen
);
631 count
= proplen
/ sizeof(struct indicator_elem
);
633 for (i
= 0; i
< count
; i
++) {
634 if (__be32_to_cpu(indicators
[i
].token
) != token
)
637 *maxindex
= __be32_to_cpu(indicators
[i
].maxindex
);
643 EXPORT_SYMBOL(rtas_indicator_present
);
645 int rtas_set_indicator(int indicator
, int index
, int new_value
)
647 int token
= rtas_token("set-indicator");
650 if (token
== RTAS_UNKNOWN_SERVICE
)
654 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
655 } while (rtas_busy_delay(rc
));
658 return rtas_error_rc(rc
);
661 EXPORT_SYMBOL(rtas_set_indicator
);
664 * Ignoring RTAS extended delay
666 int rtas_set_indicator_fast(int indicator
, int index
, int new_value
)
669 int token
= rtas_token("set-indicator");
671 if (token
== RTAS_UNKNOWN_SERVICE
)
674 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
676 WARN_ON(rc
== RTAS_BUSY
|| (rc
>= RTAS_EXTENDED_DELAY_MIN
&&
677 rc
<= RTAS_EXTENDED_DELAY_MAX
));
680 return rtas_error_rc(rc
);
685 void __noreturn
rtas_restart(char *cmd
)
687 if (rtas_flash_term_hook
)
688 rtas_flash_term_hook(SYS_RESTART
);
689 printk("RTAS system-reboot returned %d\n",
690 rtas_call(rtas_token("system-reboot"), 0, 1, NULL
));
694 void rtas_power_off(void)
696 if (rtas_flash_term_hook
)
697 rtas_flash_term_hook(SYS_POWER_OFF
);
698 /* allow power on only with power button press */
699 printk("RTAS power-off returned %d\n",
700 rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1));
704 void __noreturn
rtas_halt(void)
706 if (rtas_flash_term_hook
)
707 rtas_flash_term_hook(SYS_HALT
);
708 /* allow power on only with power button press */
709 printk("RTAS power-off returned %d\n",
710 rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1));
714 /* Must be in the RMO region, so we place it here */
715 static char rtas_os_term_buf
[2048];
717 void rtas_os_term(char *str
)
722 * Firmware with the ibm,extended-os-term property is guaranteed
723 * to always return from an ibm,os-term call. Earlier versions without
724 * this property may terminate the partition which we want to avoid
725 * since it interferes with panic_timeout.
727 if (RTAS_UNKNOWN_SERVICE
== rtas_token("ibm,os-term") ||
728 RTAS_UNKNOWN_SERVICE
== rtas_token("ibm,extended-os-term"))
731 snprintf(rtas_os_term_buf
, 2048, "OS panic: %s", str
);
734 status
= rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL
,
735 __pa(rtas_os_term_buf
));
736 } while (rtas_busy_delay(status
));
739 printk(KERN_EMERG
"ibm,os-term call failed %d\n", status
);
742 static int ibm_suspend_me_token
= RTAS_UNKNOWN_SERVICE
;
743 #ifdef CONFIG_PPC_PSERIES
744 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
746 u16 slb_size
= mmu_slb_size
;
747 int rc
= H_MULTI_THREADS_ACTIVE
;
750 slb_set_size(SLB_MIN_SIZE
);
751 printk(KERN_DEBUG
"calling ibm,suspend-me on cpu %i\n", smp_processor_id());
753 while (rc
== H_MULTI_THREADS_ACTIVE
&& !atomic_read(&data
->done
) &&
754 !atomic_read(&data
->error
))
755 rc
= rtas_call(data
->token
, 0, 1, NULL
);
757 if (rc
|| atomic_read(&data
->error
)) {
758 printk(KERN_DEBUG
"ibm,suspend-me returned %d\n", rc
);
759 slb_set_size(slb_size
);
762 if (atomic_read(&data
->error
))
763 rc
= atomic_read(&data
->error
);
765 atomic_set(&data
->error
, rc
);
766 pSeries_coalesce_init();
768 if (wake_when_done
) {
769 atomic_set(&data
->done
, 1);
771 for_each_online_cpu(cpu
)
772 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
775 if (atomic_dec_return(&data
->working
) == 0)
776 complete(data
->complete
);
781 int rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
)
783 atomic_inc(&data
->working
);
784 return __rtas_suspend_last_cpu(data
, 0);
787 static int __rtas_suspend_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
790 unsigned long msr_save
;
793 atomic_inc(&data
->working
);
795 /* really need to ensure MSR.EE is off for H_JOIN */
797 mtmsr(msr_save
& ~(MSR_EE
));
799 while (rc
== H_SUCCESS
&& !atomic_read(&data
->done
) && !atomic_read(&data
->error
))
800 rc
= plpar_hcall_norets(H_JOIN
);
804 if (rc
== H_SUCCESS
) {
805 /* This cpu was prodded and the suspend is complete. */
807 } else if (rc
== H_CONTINUE
) {
808 /* All other cpus are in H_JOIN, this cpu does
811 return __rtas_suspend_last_cpu(data
, wake_when_done
);
813 printk(KERN_ERR
"H_JOIN on cpu %i failed with rc = %ld\n",
814 smp_processor_id(), rc
);
815 atomic_set(&data
->error
, rc
);
818 if (wake_when_done
) {
819 atomic_set(&data
->done
, 1);
821 /* This cpu did the suspend or got an error; in either case,
822 * we need to prod all other other cpus out of join state.
823 * Extra prods are harmless.
825 for_each_online_cpu(cpu
)
826 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
829 if (atomic_dec_return(&data
->working
) == 0)
830 complete(data
->complete
);
834 int rtas_suspend_cpu(struct rtas_suspend_me_data
*data
)
836 return __rtas_suspend_cpu(data
, 0);
839 static void rtas_percpu_suspend_me(void *info
)
841 __rtas_suspend_cpu((struct rtas_suspend_me_data
*)info
, 1);
844 enum rtas_cpu_state
{
850 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state
,
853 if (!cpumask_empty(cpus
)) {
860 /* On return cpumask will be altered to indicate CPUs changed.
861 * CPUs with states changed will be set in the mask,
862 * CPUs with status unchanged will be unset in the mask. */
863 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state
,
870 if (cpumask_empty(cpus
))
873 for_each_cpu(cpu
, cpus
) {
876 cpuret
= cpu_down(cpu
);
879 cpuret
= cpu_up(cpu
);
883 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
885 ((state
== UP
) ? "up" : "down"),
890 /* clear bits for unchanged cpus, return */
891 cpumask_shift_right(cpus
, cpus
, cpu
);
892 cpumask_shift_left(cpus
, cpus
, cpu
);
895 /* clear bit for unchanged cpu, continue */
896 cpumask_clear_cpu(cpu
, cpus
);
905 int rtas_online_cpus_mask(cpumask_var_t cpus
)
909 ret
= rtas_cpu_state_change_mask(UP
, cpus
);
912 cpumask_var_t tmp_mask
;
914 if (!alloc_cpumask_var(&tmp_mask
, GFP_KERNEL
))
917 /* Use tmp_mask to preserve cpus mask from first failure */
918 cpumask_copy(tmp_mask
, cpus
);
919 rtas_offline_cpus_mask(tmp_mask
);
920 free_cpumask_var(tmp_mask
);
925 EXPORT_SYMBOL(rtas_online_cpus_mask
);
927 int rtas_offline_cpus_mask(cpumask_var_t cpus
)
929 return rtas_cpu_state_change_mask(DOWN
, cpus
);
931 EXPORT_SYMBOL(rtas_offline_cpus_mask
);
933 int rtas_ibm_suspend_me(u64 handle
)
937 unsigned long retbuf
[PLPAR_HCALL_BUFSIZE
];
938 struct rtas_suspend_me_data data
;
939 DECLARE_COMPLETION_ONSTACK(done
);
940 cpumask_var_t offline_mask
;
943 if (!rtas_service_present("ibm,suspend-me"))
946 /* Make sure the state is valid */
947 rc
= plpar_hcall(H_VASI_STATE
, retbuf
, handle
);
952 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned %ld\n",rc
);
954 } else if (state
== H_VASI_ENABLED
) {
956 } else if (state
!= H_VASI_SUSPENDING
) {
957 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned state %ld\n",
962 if (!alloc_cpumask_var(&offline_mask
, GFP_KERNEL
))
965 atomic_set(&data
.working
, 0);
966 atomic_set(&data
.done
, 0);
967 atomic_set(&data
.error
, 0);
968 data
.token
= rtas_token("ibm,suspend-me");
969 data
.complete
= &done
;
971 /* All present CPUs must be online */
972 cpumask_andnot(offline_mask
, cpu_present_mask
, cpu_online_mask
);
973 cpuret
= rtas_online_cpus_mask(offline_mask
);
975 pr_err("%s: Could not bring present CPUs online.\n", __func__
);
976 atomic_set(&data
.error
, cpuret
);
980 cpu_hotplug_disable();
982 /* Check if we raced with a CPU-Offline Operation */
983 if (unlikely(!cpumask_equal(cpu_present_mask
, cpu_online_mask
))) {
984 pr_err("%s: Raced against a concurrent CPU-Offline\n",
986 atomic_set(&data
.error
, -EBUSY
);
987 goto out_hotplug_enable
;
990 /* Call function on all CPUs. One of us will make the
993 on_each_cpu(rtas_percpu_suspend_me
, &data
, 0);
995 wait_for_completion(&done
);
997 if (atomic_read(&data
.error
) != 0)
998 printk(KERN_ERR
"Error doing global join\n");
1001 cpu_hotplug_enable();
1003 /* Take down CPUs not online prior to suspend */
1004 cpuret
= rtas_offline_cpus_mask(offline_mask
);
1006 pr_warn("%s: Could not restore CPUs to offline state.\n",
1010 free_cpumask_var(offline_mask
);
1011 return atomic_read(&data
.error
);
1013 #else /* CONFIG_PPC_PSERIES */
1014 int rtas_ibm_suspend_me(u64 handle
)
1021 * Find a specific pseries error log in an RTAS extended event log.
1022 * @log: RTAS error/event log
1023 * @section_id: two character section identifier
1025 * Returns a pointer to the specified errorlog or NULL if not found.
1027 struct pseries_errorlog
*get_pseries_errorlog(struct rtas_error_log
*log
,
1028 uint16_t section_id
)
1030 struct rtas_ext_event_log_v6
*ext_log
=
1031 (struct rtas_ext_event_log_v6
*)log
->buffer
;
1032 struct pseries_errorlog
*sect
;
1033 unsigned char *p
, *log_end
;
1034 uint32_t ext_log_length
= rtas_error_extended_log_length(log
);
1035 uint8_t log_format
= rtas_ext_event_log_format(ext_log
);
1036 uint32_t company_id
= rtas_ext_event_company_id(ext_log
);
1038 /* Check that we understand the format */
1039 if (ext_log_length
< sizeof(struct rtas_ext_event_log_v6
) ||
1040 log_format
!= RTAS_V6EXT_LOG_FORMAT_EVENT_LOG
||
1041 company_id
!= RTAS_V6EXT_COMPANY_ID_IBM
)
1044 log_end
= log
->buffer
+ ext_log_length
;
1045 p
= ext_log
->vendor_log
;
1047 while (p
< log_end
) {
1048 sect
= (struct pseries_errorlog
*)p
;
1049 if (pseries_errorlog_id(sect
) == section_id
)
1051 p
+= pseries_errorlog_length(sect
);
1057 /* We assume to be passed big endian arguments */
1058 SYSCALL_DEFINE1(rtas
, struct rtas_args __user
*, uargs
)
1060 struct rtas_args args
;
1061 unsigned long flags
;
1062 char *buff_copy
, *errbuf
= NULL
;
1063 int nargs
, nret
, token
;
1065 if (!capable(CAP_SYS_ADMIN
))
1071 if (copy_from_user(&args
, uargs
, 3 * sizeof(u32
)) != 0)
1074 nargs
= be32_to_cpu(args
.nargs
);
1075 nret
= be32_to_cpu(args
.nret
);
1076 token
= be32_to_cpu(args
.token
);
1078 if (nargs
>= ARRAY_SIZE(args
.args
)
1079 || nret
> ARRAY_SIZE(args
.args
)
1080 || nargs
+ nret
> ARRAY_SIZE(args
.args
))
1084 if (copy_from_user(args
.args
, uargs
->args
,
1085 nargs
* sizeof(rtas_arg_t
)) != 0)
1088 if (token
== RTAS_UNKNOWN_SERVICE
)
1091 args
.rets
= &args
.args
[nargs
];
1092 memset(args
.rets
, 0, nret
* sizeof(rtas_arg_t
));
1094 /* Need to handle ibm,suspend_me call specially */
1095 if (token
== ibm_suspend_me_token
) {
1098 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1099 * endian, or at least the hcall within it requires it.
1102 u64 handle
= ((u64
)be32_to_cpu(args
.args
[0]) << 32)
1103 | be32_to_cpu(args
.args
[1]);
1104 rc
= rtas_ibm_suspend_me(handle
);
1106 args
.rets
[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE
);
1107 else if (rc
== -EIO
)
1108 args
.rets
[0] = cpu_to_be32(-1);
1114 buff_copy
= get_errorlog_buffer();
1116 flags
= lock_rtas();
1119 enter_rtas(__pa(&rtas
.args
));
1122 /* A -1 return code indicates that the last command couldn't
1123 be completed due to a hardware error. */
1124 if (be32_to_cpu(args
.rets
[0]) == -1)
1125 errbuf
= __fetch_rtas_last_error(buff_copy
);
1131 log_error(errbuf
, ERR_TYPE_RTAS_LOG
, 0);
1136 /* Copy out args. */
1137 if (copy_to_user(uargs
->args
+ nargs
,
1139 nret
* sizeof(rtas_arg_t
)) != 0)
1146 * Call early during boot, before mem init, to retrieve the RTAS
1147 * information from the device-tree and allocate the RMO buffer for userland
1150 void __init
rtas_initialize(void)
1152 unsigned long rtas_region
= RTAS_INSTANTIATE_MAX
;
1153 u32 base
, size
, entry
;
1154 int no_base
, no_size
, no_entry
;
1156 /* Get RTAS dev node and fill up our "rtas" structure with infos
1159 rtas
.dev
= of_find_node_by_name(NULL
, "rtas");
1163 no_base
= of_property_read_u32(rtas
.dev
, "linux,rtas-base", &base
);
1164 no_size
= of_property_read_u32(rtas
.dev
, "rtas-size", &size
);
1165 if (no_base
|| no_size
) {
1166 of_node_put(rtas
.dev
);
1173 no_entry
= of_property_read_u32(rtas
.dev
, "linux,rtas-entry", &entry
);
1174 rtas
.entry
= no_entry
? rtas
.base
: entry
;
1176 /* If RTAS was found, allocate the RMO buffer for it and look for
1177 * the stop-self token if any
1180 if (firmware_has_feature(FW_FEATURE_LPAR
)) {
1181 rtas_region
= min(ppc64_rma_size
, RTAS_INSTANTIATE_MAX
);
1182 ibm_suspend_me_token
= rtas_token("ibm,suspend-me");
1185 rtas_rmo_buf
= memblock_phys_alloc_range(RTAS_RMOBUF_MAX
, PAGE_SIZE
,
1188 panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
1189 PAGE_SIZE
, &rtas_region
);
1191 #ifdef CONFIG_RTAS_ERROR_LOGGING
1192 rtas_last_error_token
= rtas_token("rtas-last-error");
1196 int __init
early_init_dt_scan_rtas(unsigned long node
,
1197 const char *uname
, int depth
, void *data
)
1199 const u32
*basep
, *entryp
, *sizep
;
1201 if (depth
!= 1 || strcmp(uname
, "rtas") != 0)
1204 basep
= of_get_flat_dt_prop(node
, "linux,rtas-base", NULL
);
1205 entryp
= of_get_flat_dt_prop(node
, "linux,rtas-entry", NULL
);
1206 sizep
= of_get_flat_dt_prop(node
, "rtas-size", NULL
);
1208 if (basep
&& entryp
&& sizep
) {
1210 rtas
.entry
= *entryp
;
1214 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1215 basep
= of_get_flat_dt_prop(node
, "put-term-char", NULL
);
1217 rtas_putchar_token
= *basep
;
1219 basep
= of_get_flat_dt_prop(node
, "get-term-char", NULL
);
1221 rtas_getchar_token
= *basep
;
1223 if (rtas_putchar_token
!= RTAS_UNKNOWN_SERVICE
&&
1224 rtas_getchar_token
!= RTAS_UNKNOWN_SERVICE
)
1225 udbg_init_rtas_console();
1233 static arch_spinlock_t timebase_lock
;
1234 static u64 timebase
= 0;
1236 void rtas_give_timebase(void)
1238 unsigned long flags
;
1240 local_irq_save(flags
);
1242 arch_spin_lock(&timebase_lock
);
1243 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL
);
1244 timebase
= get_tb();
1245 arch_spin_unlock(&timebase_lock
);
1249 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL
);
1250 local_irq_restore(flags
);
1253 void rtas_take_timebase(void)
1257 arch_spin_lock(&timebase_lock
);
1258 set_tb(timebase
>> 32, timebase
& 0xffffffff);
1260 arch_spin_unlock(&timebase_lock
);