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10#include <stdarg.h>
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>
26
27#include <asm/prom.h>
28#include <asm/rtas.h>
29#include <asm/hvcall.h>
30#include <asm/machdep.h>
31#include <asm/firmware.h>
32#include <asm/page.h>
33#include <asm/param.h>
34#include <asm/delay.h>
35#include <linux/uaccess.h>
36#include <asm/udbg.h>
37#include <asm/syscalls.h>
38#include <asm/smp.h>
39#include <linux/atomic.h>
40#include <asm/time.h>
41#include <asm/mmu.h>
42#include <asm/topology.h>
43
44
45void enter_rtas(unsigned long);
46
47struct rtas_t rtas = {
48 .lock = __ARCH_SPIN_LOCK_UNLOCKED
49};
50EXPORT_SYMBOL(rtas);
51
52DEFINE_SPINLOCK(rtas_data_buf_lock);
53EXPORT_SYMBOL(rtas_data_buf_lock);
54
55char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
56EXPORT_SYMBOL(rtas_data_buf);
57
58unsigned long rtas_rmo_buf;
59
60
61
62
63
64void (*rtas_flash_term_hook)(int);
65EXPORT_SYMBOL(rtas_flash_term_hook);
66
67
68
69
70
71
72static unsigned long lock_rtas(void)
73{
74 unsigned long flags;
75
76 local_irq_save(flags);
77 preempt_disable();
78 arch_spin_lock(&rtas.lock);
79 return flags;
80}
81
82static void unlock_rtas(unsigned long flags)
83{
84 arch_spin_unlock(&rtas.lock);
85 local_irq_restore(flags);
86 preempt_enable();
87}
88
89
90
91
92
93
94static void call_rtas_display_status(unsigned char c)
95{
96 unsigned long s;
97
98 if (!rtas.base)
99 return;
100
101 s = lock_rtas();
102 rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
103 unlock_rtas(s);
104}
105
106static void call_rtas_display_status_delay(char c)
107{
108 static int pending_newline = 0;
109 static int width = 16;
110
111 if (c == '\n') {
112 while (width-- > 0)
113 call_rtas_display_status(' ');
114 width = 16;
115 mdelay(500);
116 pending_newline = 1;
117 } else {
118 if (pending_newline) {
119 call_rtas_display_status('\r');
120 call_rtas_display_status('\n');
121 }
122 pending_newline = 0;
123 if (width--) {
124 call_rtas_display_status(c);
125 udelay(10000);
126 }
127 }
128}
129
130void __init udbg_init_rtas_panel(void)
131{
132 udbg_putc = call_rtas_display_status_delay;
133}
134
135#ifdef CONFIG_UDBG_RTAS_CONSOLE
136
137
138
139
140
141static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
142static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
143
144static void udbg_rtascon_putc(char c)
145{
146 int tries;
147
148 if (!rtas.base)
149 return;
150
151
152 if (c == '\n')
153 udbg_rtascon_putc('\r');
154
155
156 for (tries = 0; tries < 16; tries++) {
157 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
158 break;
159 udelay(1000);
160 }
161}
162
163static int udbg_rtascon_getc_poll(void)
164{
165 int c;
166
167 if (!rtas.base)
168 return -1;
169
170 if (rtas_call(rtas_getchar_token, 0, 2, &c))
171 return -1;
172
173 return c;
174}
175
176static int udbg_rtascon_getc(void)
177{
178 int c;
179
180 while ((c = udbg_rtascon_getc_poll()) == -1)
181 ;
182
183 return c;
184}
185
186
187void __init udbg_init_rtas_console(void)
188{
189 udbg_putc = udbg_rtascon_putc;
190 udbg_getc = udbg_rtascon_getc;
191 udbg_getc_poll = udbg_rtascon_getc_poll;
192}
193#endif
194
195void rtas_progress(char *s, unsigned short hex)
196{
197 struct device_node *root;
198 int width;
199 const __be32 *p;
200 char *os;
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;
207
208 if (!rtas.base)
209 return;
210
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);
225 of_node_put(root);
226 }
227 display_character = rtas_token("display-character");
228 set_indicator = rtas_token("set-indicator");
229 }
230
231 if (display_character == RTAS_UNKNOWN_SERVICE) {
232
233 if (set_indicator != RTAS_UNKNOWN_SERVICE)
234 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
235 return;
236 }
237
238 spin_lock(&progress_lock);
239
240
241
242
243
244
245
246
247
248
249 if (pending_newline) {
250 rtas_call(display_character, 1, 1, NULL, '\r');
251 rtas_call(display_character, 1, 1, NULL, '\n');
252 pending_newline = 0;
253 } else {
254 current_line = 0;
255 if (form_feed)
256 rtas_call(display_character, 1, 1, NULL,
257 (char)form_feed);
258 else
259 rtas_call(display_character, 1, 1, NULL, '\r');
260 }
261
262 if (row_width)
263 width = row_width[current_line];
264 else
265 width = display_width;
266 os = s;
267 while (*os) {
268 if (*os == '\n' || *os == '\r') {
269
270
271
272
273 if (*os == '\n' && !os[1]) {
274 pending_newline = 1;
275 current_line++;
276 if (current_line > display_lines-1)
277 current_line = display_lines-1;
278 spin_unlock(&progress_lock);
279 return;
280 }
281
282
283
284 if (*os == '\n') {
285 rtas_call(display_character, 1, 1, NULL, '\r');
286 rtas_call(display_character, 1, 1, NULL, '\n');
287 } else {
288
289
290
291 rtas_call(display_character, 1, 1, NULL, *os);
292 }
293
294 if (row_width)
295 width = row_width[current_line];
296 else
297 width = display_width;
298 } else {
299 width--;
300 rtas_call(display_character, 1, 1, NULL, *os);
301 }
302
303 os++;
304
305
306 if (width <= 0)
307 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
308 os++;
309 }
310
311 spin_unlock(&progress_lock);
312}
313EXPORT_SYMBOL(rtas_progress);
314
315int rtas_token(const char *service)
316{
317 const __be32 *tokp;
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;
322}
323EXPORT_SYMBOL(rtas_token);
324
325int rtas_service_present(const char *service)
326{
327 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
328}
329EXPORT_SYMBOL(rtas_service_present);
330
331#ifdef CONFIG_RTAS_ERROR_LOGGING
332
333
334
335
336
337int rtas_get_error_log_max(void)
338{
339 static int rtas_error_log_max;
340 if (rtas_error_log_max)
341 return rtas_error_log_max;
342
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",
347 rtas_error_log_max);
348 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
349 }
350 return rtas_error_log_max;
351}
352EXPORT_SYMBOL(rtas_get_error_log_max);
353
354
355static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
356static int rtas_last_error_token;
357
358
359
360
361
362
363
364static char *__fetch_rtas_last_error(char *altbuf)
365{
366 struct rtas_args err_args, save_args;
367 u32 bufsz;
368 char *buf = NULL;
369
370 if (rtas_last_error_token == -1)
371 return NULL;
372
373 bufsz = rtas_get_error_log_max();
374
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;
381
382 save_args = rtas.args;
383 rtas.args = err_args;
384
385 enter_rtas(__pa(&rtas.args));
386
387 err_args = rtas.args;
388 rtas.args = save_args;
389
390
391 if (unlikely(err_args.args[2] == 0)) {
392 if (altbuf) {
393 buf = altbuf;
394 } else {
395 buf = rtas_err_buf;
396 if (slab_is_available())
397 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
398 }
399 if (buf)
400 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
401 }
402
403 return buf;
404}
405
406#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
407
408#else
409#define __fetch_rtas_last_error(x) NULL
410#define get_errorlog_buffer() NULL
411#endif
412
413
414static void
415va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
416 va_list list)
417{
418 int i;
419
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]);
424
425 for (i = 0; i < nargs; ++i)
426 args->args[i] = cpu_to_be32(va_arg(list, __u32));
427
428 for (i = 0; i < nret; ++i)
429 args->rets[i] = 0;
430
431 enter_rtas(__pa(args));
432}
433
434void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
435{
436 va_list list;
437
438 va_start(list, nret);
439 va_rtas_call_unlocked(args, token, nargs, nret, list);
440 va_end(list);
441}
442
443int rtas_call(int token, int nargs, int nret, int *outputs, ...)
444{
445 va_list list;
446 int i;
447 unsigned long s;
448 struct rtas_args *rtas_args;
449 char *buff_copy = NULL;
450 int ret;
451
452 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
453 return -1;
454
455 s = lock_rtas();
456
457
458 rtas_args = &rtas.args;
459
460 va_start(list, outputs);
461 va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
462 va_end(list);
463
464
465
466 if (be32_to_cpu(rtas_args->rets[0]) == -1)
467 buff_copy = __fetch_rtas_last_error(NULL);
468
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;
473
474 unlock_rtas(s);
475
476 if (buff_copy) {
477 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
478 if (slab_is_available())
479 kfree(buff_copy);
480 }
481 return ret;
482}
483EXPORT_SYMBOL(rtas_call);
484
485
486
487
488unsigned int rtas_busy_delay_time(int status)
489{
490 int order;
491 unsigned int ms = 0;
492
493 if (status == RTAS_BUSY) {
494 ms = 1;
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--)
499 ms *= 10;
500 }
501
502 return ms;
503}
504EXPORT_SYMBOL(rtas_busy_delay_time);
505
506
507unsigned int rtas_busy_delay(int status)
508{
509 unsigned int ms;
510
511 might_sleep();
512 ms = rtas_busy_delay_time(status);
513 if (ms && need_resched())
514 msleep(ms);
515
516 return ms;
517}
518EXPORT_SYMBOL(rtas_busy_delay);
519
520static int rtas_error_rc(int rtas_rc)
521{
522 int rc;
523
524 switch (rtas_rc) {
525 case -1:
526 rc = -EIO;
527 break;
528 case -3:
529 rc = -EINVAL;
530 break;
531 case -9000:
532 rc = -EFAULT;
533 break;
534 case -9001:
535 rc = -EEXIST;
536 break;
537 case -9002:
538 rc = -ENODEV;
539 break;
540 default:
541 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
542 __func__, rtas_rc);
543 rc = -ERANGE;
544 break;
545 }
546 return rc;
547}
548
549int rtas_get_power_level(int powerdomain, int *level)
550{
551 int token = rtas_token("get-power-level");
552 int rc;
553
554 if (token == RTAS_UNKNOWN_SERVICE)
555 return -ENOENT;
556
557 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
558 udelay(1);
559
560 if (rc < 0)
561 return rtas_error_rc(rc);
562 return rc;
563}
564EXPORT_SYMBOL(rtas_get_power_level);
565
566int rtas_set_power_level(int powerdomain, int level, int *setlevel)
567{
568 int token = rtas_token("set-power-level");
569 int rc;
570
571 if (token == RTAS_UNKNOWN_SERVICE)
572 return -ENOENT;
573
574 do {
575 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
576 } while (rtas_busy_delay(rc));
577
578 if (rc < 0)
579 return rtas_error_rc(rc);
580 return rc;
581}
582EXPORT_SYMBOL(rtas_set_power_level);
583
584int rtas_get_sensor(int sensor, int index, int *state)
585{
586 int token = rtas_token("get-sensor-state");
587 int rc;
588
589 if (token == RTAS_UNKNOWN_SERVICE)
590 return -ENOENT;
591
592 do {
593 rc = rtas_call(token, 2, 2, state, sensor, index);
594 } while (rtas_busy_delay(rc));
595
596 if (rc < 0)
597 return rtas_error_rc(rc);
598 return rc;
599}
600EXPORT_SYMBOL(rtas_get_sensor);
601
602int rtas_get_sensor_fast(int sensor, int index, int *state)
603{
604 int token = rtas_token("get-sensor-state");
605 int rc;
606
607 if (token == RTAS_UNKNOWN_SERVICE)
608 return -ENOENT;
609
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));
613
614 if (rc < 0)
615 return rtas_error_rc(rc);
616 return rc;
617}
618
619bool rtas_indicator_present(int token, int *maxindex)
620{
621 int proplen, count, i;
622 const struct indicator_elem {
623 __be32 token;
624 __be32 maxindex;
625 } *indicators;
626
627 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
628 if (!indicators)
629 return false;
630
631 count = proplen / sizeof(struct indicator_elem);
632
633 for (i = 0; i < count; i++) {
634 if (__be32_to_cpu(indicators[i].token) != token)
635 continue;
636 if (maxindex)
637 *maxindex = __be32_to_cpu(indicators[i].maxindex);
638 return true;
639 }
640
641 return false;
642}
643EXPORT_SYMBOL(rtas_indicator_present);
644
645int rtas_set_indicator(int indicator, int index, int new_value)
646{
647 int token = rtas_token("set-indicator");
648 int rc;
649
650 if (token == RTAS_UNKNOWN_SERVICE)
651 return -ENOENT;
652
653 do {
654 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
655 } while (rtas_busy_delay(rc));
656
657 if (rc < 0)
658 return rtas_error_rc(rc);
659 return rc;
660}
661EXPORT_SYMBOL(rtas_set_indicator);
662
663
664
665
666int rtas_set_indicator_fast(int indicator, int index, int new_value)
667{
668 int rc;
669 int token = rtas_token("set-indicator");
670
671 if (token == RTAS_UNKNOWN_SERVICE)
672 return -ENOENT;
673
674 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
675
676 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
677 rc <= RTAS_EXTENDED_DELAY_MAX));
678
679 if (rc < 0)
680 return rtas_error_rc(rc);
681
682 return rc;
683}
684
685void __noreturn rtas_restart(char *cmd)
686{
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));
691 for (;;);
692}
693
694void rtas_power_off(void)
695{
696 if (rtas_flash_term_hook)
697 rtas_flash_term_hook(SYS_POWER_OFF);
698
699 printk("RTAS power-off returned %d\n",
700 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
701 for (;;);
702}
703
704void __noreturn rtas_halt(void)
705{
706 if (rtas_flash_term_hook)
707 rtas_flash_term_hook(SYS_HALT);
708
709 printk("RTAS power-off returned %d\n",
710 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
711 for (;;);
712}
713
714
715static char rtas_os_term_buf[2048];
716
717void rtas_os_term(char *str)
718{
719 int status;
720
721
722
723
724
725
726
727 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
728 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
729 return;
730
731 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
732
733 do {
734 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
735 __pa(rtas_os_term_buf));
736 } while (rtas_busy_delay(status));
737
738 if (status != 0)
739 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
740}
741
742static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
743#ifdef CONFIG_PPC_PSERIES
744static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
745{
746 u16 slb_size = mmu_slb_size;
747 int rc = H_MULTI_THREADS_ACTIVE;
748 int cpu;
749
750 slb_set_size(SLB_MIN_SIZE);
751 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
752
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);
756
757 if (rc || atomic_read(&data->error)) {
758 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
759 slb_set_size(slb_size);
760 }
761
762 if (atomic_read(&data->error))
763 rc = atomic_read(&data->error);
764
765 atomic_set(&data->error, rc);
766 pSeries_coalesce_init();
767
768 if (wake_when_done) {
769 atomic_set(&data->done, 1);
770
771 for_each_online_cpu(cpu)
772 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
773 }
774
775 if (atomic_dec_return(&data->working) == 0)
776 complete(data->complete);
777
778 return rc;
779}
780
781int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
782{
783 atomic_inc(&data->working);
784 return __rtas_suspend_last_cpu(data, 0);
785}
786
787static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
788{
789 long rc = H_SUCCESS;
790 unsigned long msr_save;
791 int cpu;
792
793 atomic_inc(&data->working);
794
795
796 msr_save = mfmsr();
797 mtmsr(msr_save & ~(MSR_EE));
798
799 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
800 rc = plpar_hcall_norets(H_JOIN);
801
802 mtmsr(msr_save);
803
804 if (rc == H_SUCCESS) {
805
806 goto out;
807 } else if (rc == H_CONTINUE) {
808
809
810
811 return __rtas_suspend_last_cpu(data, wake_when_done);
812 } else {
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);
816 }
817
818 if (wake_when_done) {
819 atomic_set(&data->done, 1);
820
821
822
823
824
825 for_each_online_cpu(cpu)
826 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
827 }
828out:
829 if (atomic_dec_return(&data->working) == 0)
830 complete(data->complete);
831 return rc;
832}
833
834int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
835{
836 return __rtas_suspend_cpu(data, 0);
837}
838
839static void rtas_percpu_suspend_me(void *info)
840{
841 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
842}
843
844enum rtas_cpu_state {
845 DOWN,
846 UP,
847};
848
849#ifndef CONFIG_SMP
850static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
851 cpumask_var_t cpus)
852{
853 if (!cpumask_empty(cpus)) {
854 cpumask_clear(cpus);
855 return -EINVAL;
856 } else
857 return 0;
858}
859#else
860
861
862
863static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
864 cpumask_var_t cpus)
865{
866 int cpu;
867 int cpuret = 0;
868 int ret = 0;
869
870 if (cpumask_empty(cpus))
871 return 0;
872
873 for_each_cpu(cpu, cpus) {
874 switch (state) {
875 case DOWN:
876 cpuret = cpu_down(cpu);
877 break;
878 case UP:
879 cpuret = cpu_up(cpu);
880 break;
881 }
882 if (cpuret) {
883 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
884 __func__,
885 ((state == UP) ? "up" : "down"),
886 cpu, cpuret);
887 if (!ret)
888 ret = cpuret;
889 if (state == UP) {
890
891 cpumask_shift_right(cpus, cpus, cpu);
892 cpumask_shift_left(cpus, cpus, cpu);
893 break;
894 } else {
895
896 cpumask_clear_cpu(cpu, cpus);
897 }
898 }
899 }
900
901 return ret;
902}
903#endif
904
905int rtas_online_cpus_mask(cpumask_var_t cpus)
906{
907 int ret;
908
909 ret = rtas_cpu_state_change_mask(UP, cpus);
910
911 if (ret) {
912 cpumask_var_t tmp_mask;
913
914 if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL))
915 return ret;
916
917
918 cpumask_copy(tmp_mask, cpus);
919 rtas_offline_cpus_mask(tmp_mask);
920 free_cpumask_var(tmp_mask);
921 }
922
923 return ret;
924}
925EXPORT_SYMBOL(rtas_online_cpus_mask);
926
927int rtas_offline_cpus_mask(cpumask_var_t cpus)
928{
929 return rtas_cpu_state_change_mask(DOWN, cpus);
930}
931EXPORT_SYMBOL(rtas_offline_cpus_mask);
932
933int rtas_ibm_suspend_me(u64 handle)
934{
935 long state;
936 long rc;
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;
941 int cpuret;
942
943 if (!rtas_service_present("ibm,suspend-me"))
944 return -ENOSYS;
945
946
947 rc = plpar_hcall(H_VASI_STATE, retbuf, handle);
948
949 state = retbuf[0];
950
951 if (rc) {
952 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
953 return rc;
954 } else if (state == H_VASI_ENABLED) {
955 return -EAGAIN;
956 } else if (state != H_VASI_SUSPENDING) {
957 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
958 state);
959 return -EIO;
960 }
961
962 if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL))
963 return -ENOMEM;
964
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;
970
971
972 cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
973 cpuret = rtas_online_cpus_mask(offline_mask);
974 if (cpuret) {
975 pr_err("%s: Could not bring present CPUs online.\n", __func__);
976 atomic_set(&data.error, cpuret);
977 goto out;
978 }
979
980 cpu_hotplug_disable();
981
982
983 if (!cpumask_equal(cpu_present_mask, cpu_online_mask)) {
984 pr_info("%s: Raced against a concurrent CPU-Offline\n", __func__);
985 atomic_set(&data.error, -EAGAIN);
986 goto out_hotplug_enable;
987 }
988
989
990
991
992 on_each_cpu(rtas_percpu_suspend_me, &data, 0);
993
994 wait_for_completion(&done);
995
996 if (atomic_read(&data.error) != 0)
997 printk(KERN_ERR "Error doing global join\n");
998
999out_hotplug_enable:
1000 cpu_hotplug_enable();
1001
1002
1003 cpuret = rtas_offline_cpus_mask(offline_mask);
1004 if (cpuret)
1005 pr_warn("%s: Could not restore CPUs to offline state.\n",
1006 __func__);
1007
1008out:
1009 free_cpumask_var(offline_mask);
1010 return atomic_read(&data.error);
1011}
1012#else
1013int rtas_ibm_suspend_me(u64 handle)
1014{
1015 return -ENOSYS;
1016}
1017#endif
1018
1019
1020
1021
1022
1023
1024
1025
1026struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
1027 uint16_t section_id)
1028{
1029 struct rtas_ext_event_log_v6 *ext_log =
1030 (struct rtas_ext_event_log_v6 *)log->buffer;
1031 struct pseries_errorlog *sect;
1032 unsigned char *p, *log_end;
1033 uint32_t ext_log_length = rtas_error_extended_log_length(log);
1034 uint8_t log_format = rtas_ext_event_log_format(ext_log);
1035 uint32_t company_id = rtas_ext_event_company_id(ext_log);
1036
1037
1038 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
1039 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
1040 company_id != RTAS_V6EXT_COMPANY_ID_IBM)
1041 return NULL;
1042
1043 log_end = log->buffer + ext_log_length;
1044 p = ext_log->vendor_log;
1045
1046 while (p < log_end) {
1047 sect = (struct pseries_errorlog *)p;
1048 if (pseries_errorlog_id(sect) == section_id)
1049 return sect;
1050 p += pseries_errorlog_length(sect);
1051 }
1052
1053 return NULL;
1054}
1055
1056
1057SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
1058{
1059 struct rtas_args args;
1060 unsigned long flags;
1061 char *buff_copy, *errbuf = NULL;
1062 int nargs, nret, token;
1063
1064 if (!capable(CAP_SYS_ADMIN))
1065 return -EPERM;
1066
1067 if (!rtas.entry)
1068 return -EINVAL;
1069
1070 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1071 return -EFAULT;
1072
1073 nargs = be32_to_cpu(args.nargs);
1074 nret = be32_to_cpu(args.nret);
1075 token = be32_to_cpu(args.token);
1076
1077 if (nargs >= ARRAY_SIZE(args.args)
1078 || nret > ARRAY_SIZE(args.args)
1079 || nargs + nret > ARRAY_SIZE(args.args))
1080 return -EINVAL;
1081
1082
1083 if (copy_from_user(args.args, uargs->args,
1084 nargs * sizeof(rtas_arg_t)) != 0)
1085 return -EFAULT;
1086
1087 if (token == RTAS_UNKNOWN_SERVICE)
1088 return -EINVAL;
1089
1090 args.rets = &args.args[nargs];
1091 memset(args.rets, 0, nret * sizeof(rtas_arg_t));
1092
1093
1094 if (token == ibm_suspend_me_token) {
1095
1096
1097
1098
1099
1100 int rc = 0;
1101 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
1102 | be32_to_cpu(args.args[1]);
1103 rc = rtas_ibm_suspend_me(handle);
1104 if (rc == -EAGAIN)
1105 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
1106 else if (rc == -EIO)
1107 args.rets[0] = cpu_to_be32(-1);
1108 else if (rc)
1109 return rc;
1110 goto copy_return;
1111 }
1112
1113 buff_copy = get_errorlog_buffer();
1114
1115 flags = lock_rtas();
1116
1117 rtas.args = args;
1118 enter_rtas(__pa(&rtas.args));
1119 args = rtas.args;
1120
1121
1122
1123 if (be32_to_cpu(args.rets[0]) == -1)
1124 errbuf = __fetch_rtas_last_error(buff_copy);
1125
1126 unlock_rtas(flags);
1127
1128 if (buff_copy) {
1129 if (errbuf)
1130 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1131 kfree(buff_copy);
1132 }
1133
1134 copy_return:
1135
1136 if (copy_to_user(uargs->args + nargs,
1137 args.args + nargs,
1138 nret * sizeof(rtas_arg_t)) != 0)
1139 return -EFAULT;
1140
1141 return 0;
1142}
1143
1144
1145
1146
1147
1148
1149void __init rtas_initialize(void)
1150{
1151 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1152 u32 base, size, entry;
1153 int no_base, no_size, no_entry;
1154
1155
1156
1157
1158 rtas.dev = of_find_node_by_name(NULL, "rtas");
1159 if (!rtas.dev)
1160 return;
1161
1162 no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
1163 no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
1164 if (no_base || no_size) {
1165 of_node_put(rtas.dev);
1166 rtas.dev = NULL;
1167 return;
1168 }
1169
1170 rtas.base = base;
1171 rtas.size = size;
1172 no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);
1173 rtas.entry = no_entry ? rtas.base : entry;
1174
1175
1176
1177
1178#ifdef CONFIG_PPC64
1179 if (firmware_has_feature(FW_FEATURE_LPAR)) {
1180 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1181 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
1182 }
1183#endif
1184 rtas_rmo_buf = memblock_phys_alloc_range(RTAS_RMOBUF_MAX, PAGE_SIZE,
1185 0, rtas_region);
1186 if (!rtas_rmo_buf)
1187 panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
1188 PAGE_SIZE, &rtas_region);
1189
1190#ifdef CONFIG_RTAS_ERROR_LOGGING
1191 rtas_last_error_token = rtas_token("rtas-last-error");
1192#endif
1193}
1194
1195int __init early_init_dt_scan_rtas(unsigned long node,
1196 const char *uname, int depth, void *data)
1197{
1198 const u32 *basep, *entryp, *sizep;
1199
1200 if (depth != 1 || strcmp(uname, "rtas") != 0)
1201 return 0;
1202
1203 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1204 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1205 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1206
1207 if (basep && entryp && sizep) {
1208 rtas.base = *basep;
1209 rtas.entry = *entryp;
1210 rtas.size = *sizep;
1211 }
1212
1213#ifdef CONFIG_UDBG_RTAS_CONSOLE
1214 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1215 if (basep)
1216 rtas_putchar_token = *basep;
1217
1218 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1219 if (basep)
1220 rtas_getchar_token = *basep;
1221
1222 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1223 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1224 udbg_init_rtas_console();
1225
1226#endif
1227
1228
1229 return 1;
1230}
1231
1232static arch_spinlock_t timebase_lock;
1233static u64 timebase = 0;
1234
1235void rtas_give_timebase(void)
1236{
1237 unsigned long flags;
1238
1239 local_irq_save(flags);
1240 hard_irq_disable();
1241 arch_spin_lock(&timebase_lock);
1242 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1243 timebase = get_tb();
1244 arch_spin_unlock(&timebase_lock);
1245
1246 while (timebase)
1247 barrier();
1248 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1249 local_irq_restore(flags);
1250}
1251
1252void rtas_take_timebase(void)
1253{
1254 while (!timebase)
1255 barrier();
1256 arch_spin_lock(&timebase_lock);
1257 set_tb(timebase >> 32, timebase & 0xffffffff);
1258 timebase = 0;
1259 arch_spin_unlock(&timebase_lock);
1260}
1261