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 /* This is here deliberately so it's only used in this file */
48 void enter_rtas(unsigned long);
50 struct rtas_t rtas = {
51 .lock = __ARCH_SPIN_LOCK_UNLOCKED
55 DEFINE_SPINLOCK(rtas_data_buf_lock);
56 EXPORT_SYMBOL(rtas_data_buf_lock);
58 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
59 EXPORT_SYMBOL(rtas_data_buf);
61 unsigned long rtas_rmo_buf;
64 * If non-NULL, this gets called when the kernel terminates.
65 * This is done like this so rtas_flash can be a module.
67 void (*rtas_flash_term_hook)(int);
68 EXPORT_SYMBOL(rtas_flash_term_hook);
70 /* RTAS use home made raw locking instead of spin_lock_irqsave
71 * because those can be called from within really nasty contexts
72 * such as having the timebase stopped which would lockup with
73 * normal locks and spinlock debugging enabled
75 static unsigned long lock_rtas(void)
79 local_irq_save(flags);
81 arch_spin_lock_flags(&rtas.lock, flags);
85 static void unlock_rtas(unsigned long flags)
87 arch_spin_unlock(&rtas.lock);
88 local_irq_restore(flags);
93 * call_rtas_display_status and call_rtas_display_status_delay
94 * are designed only for very early low-level debugging, which
95 * is why the token is hard-coded to 10.
97 static void call_rtas_display_status(unsigned char c)
105 rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
109 static void call_rtas_display_status_delay(char c)
111 static int pending_newline = 0; /* did last write end with unprinted newline? */
112 static int width = 16;
116 call_rtas_display_status(' ');
121 if (pending_newline) {
122 call_rtas_display_status('\r');
123 call_rtas_display_status('\n');
127 call_rtas_display_status(c);
133 void __init udbg_init_rtas_panel(void)
135 udbg_putc = call_rtas_display_status_delay;
138 #ifdef CONFIG_UDBG_RTAS_CONSOLE
140 /* If you think you're dying before early_init_dt_scan_rtas() does its
141 * work, you can hard code the token values for your firmware here and
142 * hardcode rtas.base/entry etc.
144 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
145 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
147 static void udbg_rtascon_putc(char c)
154 /* Add CRs before LFs */
156 udbg_rtascon_putc('\r');
158 /* if there is more than one character to be displayed, wait a bit */
159 for (tries = 0; tries < 16; tries++) {
160 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
166 static int udbg_rtascon_getc_poll(void)
173 if (rtas_call(rtas_getchar_token, 0, 2, &c))
179 static int udbg_rtascon_getc(void)
183 while ((c = udbg_rtascon_getc_poll()) == -1)
190 void __init udbg_init_rtas_console(void)
192 udbg_putc = udbg_rtascon_putc;
193 udbg_getc = udbg_rtascon_getc;
194 udbg_getc_poll = udbg_rtascon_getc_poll;
196 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
198 void rtas_progress(char *s, unsigned short hex)
200 struct device_node *root;
204 static int display_character, set_indicator;
205 static int display_width, display_lines, form_feed;
206 static const int *row_width;
207 static DEFINE_SPINLOCK(progress_lock);
208 static int current_line;
209 static int pending_newline = 0; /* did last write end with unprinted newline? */
214 if (display_width == 0) {
215 display_width = 0x10;
216 if ((root = of_find_node_by_path("/rtas"))) {
217 if ((p = of_get_property(root,
218 "ibm,display-line-length", NULL)))
219 display_width = be32_to_cpu(*p);
220 if ((p = of_get_property(root,
221 "ibm,form-feed", NULL)))
222 form_feed = be32_to_cpu(*p);
223 if ((p = of_get_property(root,
224 "ibm,display-number-of-lines", NULL)))
225 display_lines = be32_to_cpu(*p);
226 row_width = of_get_property(root,
227 "ibm,display-truncation-length", NULL);
230 display_character = rtas_token("display-character");
231 set_indicator = rtas_token("set-indicator");
234 if (display_character == RTAS_UNKNOWN_SERVICE) {
235 /* use hex display if available */
236 if (set_indicator != RTAS_UNKNOWN_SERVICE)
237 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
241 spin_lock(&progress_lock);
244 * Last write ended with newline, but we didn't print it since
245 * it would just clear the bottom line of output. Print it now
248 * If no newline is pending and form feed is supported, clear the
249 * display with a form feed; otherwise, print a CR to start output
250 * at the beginning of the line.
252 if (pending_newline) {
253 rtas_call(display_character, 1, 1, NULL, '\r');
254 rtas_call(display_character, 1, 1, NULL, '\n');
259 rtas_call(display_character, 1, 1, NULL,
262 rtas_call(display_character, 1, 1, NULL, '\r');
266 width = row_width[current_line];
268 width = display_width;
271 if (*os == '\n' || *os == '\r') {
272 /* If newline is the last character, save it
273 * until next call to avoid bumping up the
276 if (*os == '\n' && !os[1]) {
279 if (current_line > display_lines-1)
280 current_line = display_lines-1;
281 spin_unlock(&progress_lock);
285 /* RTAS wants CR-LF, not just LF */
288 rtas_call(display_character, 1, 1, NULL, '\r');
289 rtas_call(display_character, 1, 1, NULL, '\n');
291 /* CR might be used to re-draw a line, so we'll
292 * leave it alone and not add LF.
294 rtas_call(display_character, 1, 1, NULL, *os);
298 width = row_width[current_line];
300 width = display_width;
303 rtas_call(display_character, 1, 1, NULL, *os);
308 /* if we overwrite the screen length */
310 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
314 spin_unlock(&progress_lock);
316 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
318 int rtas_token(const char *service)
321 if (rtas.dev == NULL)
322 return RTAS_UNKNOWN_SERVICE;
323 tokp = of_get_property(rtas.dev, service, NULL);
324 return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;
326 EXPORT_SYMBOL(rtas_token);
328 int rtas_service_present(const char *service)
330 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
332 EXPORT_SYMBOL(rtas_service_present);
334 #ifdef CONFIG_RTAS_ERROR_LOGGING
336 * Return the firmware-specified size of the error log buffer
337 * for all rtas calls that require an error buffer argument.
338 * This includes 'check-exception' and 'rtas-last-error'.
340 int rtas_get_error_log_max(void)
342 static int rtas_error_log_max;
343 if (rtas_error_log_max)
344 return rtas_error_log_max;
346 rtas_error_log_max = rtas_token ("rtas-error-log-max");
347 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
348 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
349 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
351 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
353 return rtas_error_log_max;
355 EXPORT_SYMBOL(rtas_get_error_log_max);
358 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
359 static int rtas_last_error_token;
361 /** Return a copy of the detailed error text associated with the
362 * most recent failed call to rtas. Because the error text
363 * might go stale if there are any other intervening rtas calls,
364 * this routine must be called atomically with whatever produced
365 * the error (i.e. with rtas.lock still held from the previous call).
367 static char *__fetch_rtas_last_error(char *altbuf)
369 struct rtas_args err_args, save_args;
373 if (rtas_last_error_token == -1)
376 bufsz = rtas_get_error_log_max();
378 err_args.token = cpu_to_be32(rtas_last_error_token);
379 err_args.nargs = cpu_to_be32(2);
380 err_args.nret = cpu_to_be32(1);
381 err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf));
382 err_args.args[1] = cpu_to_be32(bufsz);
383 err_args.args[2] = 0;
385 save_args = rtas.args;
386 rtas.args = err_args;
388 enter_rtas(__pa(&rtas.args));
390 err_args = rtas.args;
391 rtas.args = save_args;
393 /* Log the error in the unlikely case that there was one. */
394 if (unlikely(err_args.args[2] == 0)) {
399 if (slab_is_available())
400 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
403 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
409 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
411 #else /* CONFIG_RTAS_ERROR_LOGGING */
412 #define __fetch_rtas_last_error(x) NULL
413 #define get_errorlog_buffer() NULL
418 va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
423 args->token = cpu_to_be32(token);
424 args->nargs = cpu_to_be32(nargs);
425 args->nret = cpu_to_be32(nret);
426 args->rets = &(args->args[nargs]);
428 for (i = 0; i < nargs; ++i)
429 args->args[i] = cpu_to_be32(va_arg(list, __u32));
431 for (i = 0; i < nret; ++i)
434 enter_rtas(__pa(args));
437 void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
441 va_start(list, nret);
442 va_rtas_call_unlocked(args, token, nargs, nret, list);
446 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
451 struct rtas_args *rtas_args;
452 char *buff_copy = NULL;
455 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
460 /* We use the global rtas args buffer */
461 rtas_args = &rtas.args;
463 va_start(list, outputs);
464 va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
467 /* A -1 return code indicates that the last command couldn't
468 be completed due to a hardware error. */
469 if (be32_to_cpu(rtas_args->rets[0]) == -1)
470 buff_copy = __fetch_rtas_last_error(NULL);
472 if (nret > 1 && outputs != NULL)
473 for (i = 0; i < nret-1; ++i)
474 outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);
475 ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;
480 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
481 if (slab_is_available())
486 EXPORT_SYMBOL(rtas_call);
488 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
489 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
491 unsigned int rtas_busy_delay_time(int status)
496 if (status == RTAS_BUSY) {
498 } else if (status >= RTAS_EXTENDED_DELAY_MIN &&
499 status <= RTAS_EXTENDED_DELAY_MAX) {
500 order = status - RTAS_EXTENDED_DELAY_MIN;
501 for (ms = 1; order > 0; order--)
507 EXPORT_SYMBOL(rtas_busy_delay_time);
509 /* For an RTAS busy status code, perform the hinted delay. */
510 unsigned int rtas_busy_delay(int status)
515 ms = rtas_busy_delay_time(status);
516 if (ms && need_resched())
521 EXPORT_SYMBOL(rtas_busy_delay);
523 static int rtas_error_rc(int rtas_rc)
528 case -1: /* Hardware Error */
531 case -3: /* Bad indicator/domain/etc */
534 case -9000: /* Isolation error */
537 case -9001: /* Outstanding TCE/PTE */
540 case -9002: /* No usable slot */
544 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
552 int rtas_get_power_level(int powerdomain, int *level)
554 int token = rtas_token("get-power-level");
557 if (token == RTAS_UNKNOWN_SERVICE)
560 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
564 return rtas_error_rc(rc);
567 EXPORT_SYMBOL(rtas_get_power_level);
569 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
571 int token = rtas_token("set-power-level");
574 if (token == RTAS_UNKNOWN_SERVICE)
578 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
579 } while (rtas_busy_delay(rc));
582 return rtas_error_rc(rc);
585 EXPORT_SYMBOL(rtas_set_power_level);
587 int rtas_get_sensor(int sensor, int index, int *state)
589 int token = rtas_token("get-sensor-state");
592 if (token == RTAS_UNKNOWN_SERVICE)
596 rc = rtas_call(token, 2, 2, state, sensor, index);
597 } while (rtas_busy_delay(rc));
600 return rtas_error_rc(rc);
603 EXPORT_SYMBOL(rtas_get_sensor);
605 int rtas_get_sensor_fast(int sensor, int index, int *state)
607 int token = rtas_token("get-sensor-state");
610 if (token == RTAS_UNKNOWN_SERVICE)
613 rc = rtas_call(token, 2, 2, state, sensor, index);
614 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
615 rc <= RTAS_EXTENDED_DELAY_MAX));
618 return rtas_error_rc(rc);
622 bool rtas_indicator_present(int token, int *maxindex)
624 int proplen, count, i;
625 const struct indicator_elem {
630 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
634 count = proplen / sizeof(struct indicator_elem);
636 for (i = 0; i < count; i++) {
637 if (__be32_to_cpu(indicators[i].token) != token)
640 *maxindex = __be32_to_cpu(indicators[i].maxindex);
646 EXPORT_SYMBOL(rtas_indicator_present);
648 int rtas_set_indicator(int indicator, int index, int new_value)
650 int token = rtas_token("set-indicator");
653 if (token == RTAS_UNKNOWN_SERVICE)
657 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
658 } while (rtas_busy_delay(rc));
661 return rtas_error_rc(rc);
664 EXPORT_SYMBOL(rtas_set_indicator);
667 * Ignoring RTAS extended delay
669 int rtas_set_indicator_fast(int indicator, int index, int new_value)
672 int token = rtas_token("set-indicator");
674 if (token == RTAS_UNKNOWN_SERVICE)
677 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
679 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
680 rc <= RTAS_EXTENDED_DELAY_MAX));
683 return rtas_error_rc(rc);
688 void __noreturn rtas_restart(char *cmd)
690 if (rtas_flash_term_hook)
691 rtas_flash_term_hook(SYS_RESTART);
692 printk("RTAS system-reboot returned %d\n",
693 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
697 void rtas_power_off(void)
699 if (rtas_flash_term_hook)
700 rtas_flash_term_hook(SYS_POWER_OFF);
701 /* allow power on only with power button press */
702 printk("RTAS power-off returned %d\n",
703 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
707 void __noreturn rtas_halt(void)
709 if (rtas_flash_term_hook)
710 rtas_flash_term_hook(SYS_HALT);
711 /* allow power on only with power button press */
712 printk("RTAS power-off returned %d\n",
713 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
717 /* Must be in the RMO region, so we place it here */
718 static char rtas_os_term_buf[2048];
720 void rtas_os_term(char *str)
725 * Firmware with the ibm,extended-os-term property is guaranteed
726 * to always return from an ibm,os-term call. Earlier versions without
727 * this property may terminate the partition which we want to avoid
728 * since it interferes with panic_timeout.
730 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
731 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
734 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
737 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
738 __pa(rtas_os_term_buf));
739 } while (rtas_busy_delay(status));
742 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
745 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
746 #ifdef CONFIG_PPC_PSERIES
747 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
749 u16 slb_size = mmu_slb_size;
750 int rc = H_MULTI_THREADS_ACTIVE;
753 slb_set_size(SLB_MIN_SIZE);
754 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
756 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
757 !atomic_read(&data->error))
758 rc = rtas_call(data->token, 0, 1, NULL);
760 if (rc || atomic_read(&data->error)) {
761 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
762 slb_set_size(slb_size);
765 if (atomic_read(&data->error))
766 rc = atomic_read(&data->error);
768 atomic_set(&data->error, rc);
769 pSeries_coalesce_init();
771 if (wake_when_done) {
772 atomic_set(&data->done, 1);
774 for_each_online_cpu(cpu)
775 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
778 if (atomic_dec_return(&data->working) == 0)
779 complete(data->complete);
784 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
786 atomic_inc(&data->working);
787 return __rtas_suspend_last_cpu(data, 0);
790 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
793 unsigned long msr_save;
796 atomic_inc(&data->working);
798 /* really need to ensure MSR.EE is off for H_JOIN */
800 mtmsr(msr_save & ~(MSR_EE));
802 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
803 rc = plpar_hcall_norets(H_JOIN);
807 if (rc == H_SUCCESS) {
808 /* This cpu was prodded and the suspend is complete. */
810 } else if (rc == H_CONTINUE) {
811 /* All other cpus are in H_JOIN, this cpu does
814 return __rtas_suspend_last_cpu(data, wake_when_done);
816 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
817 smp_processor_id(), rc);
818 atomic_set(&data->error, rc);
821 if (wake_when_done) {
822 atomic_set(&data->done, 1);
824 /* This cpu did the suspend or got an error; in either case,
825 * we need to prod all other other cpus out of join state.
826 * Extra prods are harmless.
828 for_each_online_cpu(cpu)
829 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
832 if (atomic_dec_return(&data->working) == 0)
833 complete(data->complete);
837 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
839 return __rtas_suspend_cpu(data, 0);
842 static void rtas_percpu_suspend_me(void *info)
844 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
847 enum rtas_cpu_state {
853 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
856 if (!cpumask_empty(cpus)) {
863 /* On return cpumask will be altered to indicate CPUs changed.
864 * CPUs with states changed will be set in the mask,
865 * CPUs with status unchanged will be unset in the mask. */
866 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
873 if (cpumask_empty(cpus))
876 for_each_cpu(cpu, cpus) {
877 struct device *dev = get_cpu_device(cpu);
881 cpuret = device_offline(dev);
884 cpuret = device_online(dev);
888 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
890 ((state == UP) ? "up" : "down"),
895 /* clear bits for unchanged cpus, return */
896 cpumask_shift_right(cpus, cpus, cpu);
897 cpumask_shift_left(cpus, cpus, cpu);
900 /* clear bit for unchanged cpu, continue */
901 cpumask_clear_cpu(cpu, cpus);
910 int rtas_online_cpus_mask(cpumask_var_t cpus)
914 ret = rtas_cpu_state_change_mask(UP, cpus);
917 cpumask_var_t tmp_mask;
919 if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY))
922 /* Use tmp_mask to preserve cpus mask from first failure */
923 cpumask_copy(tmp_mask, cpus);
924 rtas_offline_cpus_mask(tmp_mask);
925 free_cpumask_var(tmp_mask);
930 EXPORT_SYMBOL(rtas_online_cpus_mask);
932 int rtas_offline_cpus_mask(cpumask_var_t cpus)
934 return rtas_cpu_state_change_mask(DOWN, cpus);
936 EXPORT_SYMBOL(rtas_offline_cpus_mask);
938 int rtas_ibm_suspend_me(u64 handle)
942 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
943 struct rtas_suspend_me_data data;
944 DECLARE_COMPLETION_ONSTACK(done);
945 cpumask_var_t offline_mask;
948 if (!rtas_service_present("ibm,suspend-me"))
951 /* Make sure the state is valid */
952 rc = plpar_hcall(H_VASI_STATE, retbuf, handle);
957 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
959 } else if (state == H_VASI_ENABLED) {
961 } else if (state != H_VASI_SUSPENDING) {
962 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
967 if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY))
970 atomic_set(&data.working, 0);
971 atomic_set(&data.done, 0);
972 atomic_set(&data.error, 0);
973 data.token = rtas_token("ibm,suspend-me");
974 data.complete = &done;
976 lock_device_hotplug();
978 /* All present CPUs must be online */
979 cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
980 cpuret = rtas_online_cpus_mask(offline_mask);
982 pr_err("%s: Could not bring present CPUs online.\n", __func__);
983 atomic_set(&data.error, cpuret);
987 cpu_hotplug_disable();
988 stop_topology_update();
990 /* Call function on all CPUs. One of us will make the
993 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
994 atomic_set(&data.error, -EINVAL);
996 wait_for_completion(&done);
998 if (atomic_read(&data.error) != 0)
999 printk(KERN_ERR "Error doing global join\n");
1001 start_topology_update();
1002 cpu_hotplug_enable();
1004 /* Take down CPUs not online prior to suspend */
1005 cpuret = rtas_offline_cpus_mask(offline_mask);
1007 pr_warn("%s: Could not restore CPUs to offline state.\n",
1011 unlock_device_hotplug();
1012 free_cpumask_var(offline_mask);
1013 return atomic_read(&data.error);
1015 #else /* CONFIG_PPC_PSERIES */
1016 int rtas_ibm_suspend_me(u64 handle)
1023 * Find a specific pseries error log in an RTAS extended event log.
1024 * @log: RTAS error/event log
1025 * @section_id: two character section identifier
1027 * Returns a pointer to the specified errorlog or NULL if not found.
1029 struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
1030 uint16_t section_id)
1032 struct rtas_ext_event_log_v6 *ext_log =
1033 (struct rtas_ext_event_log_v6 *)log->buffer;
1034 struct pseries_errorlog *sect;
1035 unsigned char *p, *log_end;
1036 uint32_t ext_log_length = rtas_error_extended_log_length(log);
1037 uint8_t log_format = rtas_ext_event_log_format(ext_log);
1038 uint32_t company_id = rtas_ext_event_company_id(ext_log);
1040 /* Check that we understand the format */
1041 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
1042 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
1043 company_id != RTAS_V6EXT_COMPANY_ID_IBM)
1046 log_end = log->buffer + ext_log_length;
1047 p = ext_log->vendor_log;
1049 while (p < log_end) {
1050 sect = (struct pseries_errorlog *)p;
1051 if (pseries_errorlog_id(sect) == section_id)
1053 p += pseries_errorlog_length(sect);
1059 /* We assume to be passed big endian arguments */
1060 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
1062 struct rtas_args args;
1063 unsigned long flags;
1064 char *buff_copy, *errbuf = NULL;
1065 int nargs, nret, token;
1067 if (!capable(CAP_SYS_ADMIN))
1073 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1076 nargs = be32_to_cpu(args.nargs);
1077 nret = be32_to_cpu(args.nret);
1078 token = be32_to_cpu(args.token);
1080 if (nargs >= ARRAY_SIZE(args.args)
1081 || nret > ARRAY_SIZE(args.args)
1082 || nargs + nret > ARRAY_SIZE(args.args))
1086 if (copy_from_user(args.args, uargs->args,
1087 nargs * sizeof(rtas_arg_t)) != 0)
1090 if (token == RTAS_UNKNOWN_SERVICE)
1093 args.rets = &args.args[nargs];
1094 memset(args.rets, 0, nret * sizeof(rtas_arg_t));
1096 /* Need to handle ibm,suspend_me call specially */
1097 if (token == ibm_suspend_me_token) {
1100 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1101 * endian, or at least the hcall within it requires it.
1104 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
1105 | be32_to_cpu(args.args[1]);
1106 rc = rtas_ibm_suspend_me(handle);
1108 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
1109 else if (rc == -EIO)
1110 args.rets[0] = cpu_to_be32(-1);
1116 buff_copy = get_errorlog_buffer();
1118 flags = lock_rtas();
1121 enter_rtas(__pa(&rtas.args));
1124 /* A -1 return code indicates that the last command couldn't
1125 be completed due to a hardware error. */
1126 if (be32_to_cpu(args.rets[0]) == -1)
1127 errbuf = __fetch_rtas_last_error(buff_copy);
1133 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1138 /* Copy out args. */
1139 if (copy_to_user(uargs->args + nargs,
1141 nret * sizeof(rtas_arg_t)) != 0)
1148 * Call early during boot, before mem init, to retrieve the RTAS
1149 * information from the device-tree and allocate the RMO buffer for userland
1152 void __init rtas_initialize(void)
1154 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1156 /* Get RTAS dev node and fill up our "rtas" structure with infos
1159 rtas.dev = of_find_node_by_name(NULL, "rtas");
1161 const __be32 *basep, *entryp, *sizep;
1163 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
1164 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
1165 if (basep != NULL && sizep != NULL) {
1166 rtas.base = __be32_to_cpu(*basep);
1167 rtas.size = __be32_to_cpu(*sizep);
1168 entryp = of_get_property(rtas.dev,
1169 "linux,rtas-entry", NULL);
1170 if (entryp == NULL) /* Ugh */
1171 rtas.entry = rtas.base;
1173 rtas.entry = __be32_to_cpu(*entryp);
1180 /* If RTAS was found, allocate the RMO buffer for it and look for
1181 * the stop-self token if any
1184 if (firmware_has_feature(FW_FEATURE_LPAR)) {
1185 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1186 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
1189 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, 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);