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Linux/arch/powerpc/kernel/rtas.c

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  1 /*
  2  *
  3  * Procedures for interfacing to the RTAS on CHRP machines.
  4  *
  5  * Peter Bergner, IBM   March 2001.
  6  * Copyright (C) 2001 IBM.
  7  *
  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.
 12  */
 13 
 14 #include <stdarg.h>
 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 
 30 #include <asm/prom.h>
 31 #include <asm/rtas.h>
 32 #include <asm/hvcall.h>
 33 #include <asm/machdep.h>
 34 #include <asm/firmware.h>
 35 #include <asm/page.h>
 36 #include <asm/param.h>
 37 #include <asm/delay.h>
 38 #include <asm/uaccess.h>
 39 #include <asm/udbg.h>
 40 #include <asm/syscalls.h>
 41 #include <asm/smp.h>
 42 #include <linux/atomic.h>
 43 #include <asm/time.h>
 44 #include <asm/mmu.h>
 45 #include <asm/topology.h>
 46 
 47 struct rtas_t rtas = {
 48         .lock = __ARCH_SPIN_LOCK_UNLOCKED
 49 };
 50 EXPORT_SYMBOL(rtas);
 51 
 52 DEFINE_SPINLOCK(rtas_data_buf_lock);
 53 EXPORT_SYMBOL(rtas_data_buf_lock);
 54 
 55 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
 56 EXPORT_SYMBOL(rtas_data_buf);
 57 
 58 unsigned long rtas_rmo_buf;
 59 
 60 /*
 61  * If non-NULL, this gets called when the kernel terminates.
 62  * This is done like this so rtas_flash can be a module.
 63  */
 64 void (*rtas_flash_term_hook)(int);
 65 EXPORT_SYMBOL(rtas_flash_term_hook);
 66 
 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
 71  */
 72 static unsigned long lock_rtas(void)
 73 {
 74         unsigned long flags;
 75 
 76         local_irq_save(flags);
 77         preempt_disable();
 78         arch_spin_lock_flags(&rtas.lock, flags);
 79         return flags;
 80 }
 81 
 82 static 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  * 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.
 93  */
 94 static void call_rtas_display_status(char c)
 95 {
 96         struct rtas_args *args = &rtas.args;
 97         unsigned long s;
 98 
 99         if (!rtas.base)
100                 return;
101         s = lock_rtas();
102 
103         args->token = 10;
104         args->nargs = 1;
105         args->nret  = 1;
106         args->rets  = (rtas_arg_t *)&(args->args[1]);
107         args->args[0] = (unsigned char)c;
108 
109         enter_rtas(__pa(args));
110 
111         unlock_rtas(s);
112 }
113 
114 static void call_rtas_display_status_delay(char c)
115 {
116         static int pending_newline = 0;  /* did last write end with unprinted newline? */
117         static int width = 16;
118 
119         if (c == '\n') {        
120                 while (width-- > 0)
121                         call_rtas_display_status(' ');
122                 width = 16;
123                 mdelay(500);
124                 pending_newline = 1;
125         } else {
126                 if (pending_newline) {
127                         call_rtas_display_status('\r');
128                         call_rtas_display_status('\n');
129                 } 
130                 pending_newline = 0;
131                 if (width--) {
132                         call_rtas_display_status(c);
133                         udelay(10000);
134                 }
135         }
136 }
137 
138 void __init udbg_init_rtas_panel(void)
139 {
140         udbg_putc = call_rtas_display_status_delay;
141 }
142 
143 #ifdef CONFIG_UDBG_RTAS_CONSOLE
144 
145 /* If you think you're dying before early_init_dt_scan_rtas() does its
146  * work, you can hard code the token values for your firmware here and
147  * hardcode rtas.base/entry etc.
148  */
149 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
150 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
151 
152 static void udbg_rtascon_putc(char c)
153 {
154         int tries;
155 
156         if (!rtas.base)
157                 return;
158 
159         /* Add CRs before LFs */
160         if (c == '\n')
161                 udbg_rtascon_putc('\r');
162 
163         /* if there is more than one character to be displayed, wait a bit */
164         for (tries = 0; tries < 16; tries++) {
165                 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
166                         break;
167                 udelay(1000);
168         }
169 }
170 
171 static int udbg_rtascon_getc_poll(void)
172 {
173         int c;
174 
175         if (!rtas.base)
176                 return -1;
177 
178         if (rtas_call(rtas_getchar_token, 0, 2, &c))
179                 return -1;
180 
181         return c;
182 }
183 
184 static int udbg_rtascon_getc(void)
185 {
186         int c;
187 
188         while ((c = udbg_rtascon_getc_poll()) == -1)
189                 ;
190 
191         return c;
192 }
193 
194 
195 void __init udbg_init_rtas_console(void)
196 {
197         udbg_putc = udbg_rtascon_putc;
198         udbg_getc = udbg_rtascon_getc;
199         udbg_getc_poll = udbg_rtascon_getc_poll;
200 }
201 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
202 
203 void rtas_progress(char *s, unsigned short hex)
204 {
205         struct device_node *root;
206         int width;
207         const int *p;
208         char *os;
209         static int display_character, set_indicator;
210         static int display_width, display_lines, form_feed;
211         static const int *row_width;
212         static DEFINE_SPINLOCK(progress_lock);
213         static int current_line;
214         static int pending_newline = 0;  /* did last write end with unprinted newline? */
215 
216         if (!rtas.base)
217                 return;
218 
219         if (display_width == 0) {
220                 display_width = 0x10;
221                 if ((root = of_find_node_by_path("/rtas"))) {
222                         if ((p = of_get_property(root,
223                                         "ibm,display-line-length", NULL)))
224                                 display_width = *p;
225                         if ((p = of_get_property(root,
226                                         "ibm,form-feed", NULL)))
227                                 form_feed = *p;
228                         if ((p = of_get_property(root,
229                                         "ibm,display-number-of-lines", NULL)))
230                                 display_lines = *p;
231                         row_width = of_get_property(root,
232                                         "ibm,display-truncation-length", NULL);
233                         of_node_put(root);
234                 }
235                 display_character = rtas_token("display-character");
236                 set_indicator = rtas_token("set-indicator");
237         }
238 
239         if (display_character == RTAS_UNKNOWN_SERVICE) {
240                 /* use hex display if available */
241                 if (set_indicator != RTAS_UNKNOWN_SERVICE)
242                         rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
243                 return;
244         }
245 
246         spin_lock(&progress_lock);
247 
248         /*
249          * Last write ended with newline, but we didn't print it since
250          * it would just clear the bottom line of output. Print it now
251          * instead.
252          *
253          * If no newline is pending and form feed is supported, clear the
254          * display with a form feed; otherwise, print a CR to start output
255          * at the beginning of the line.
256          */
257         if (pending_newline) {
258                 rtas_call(display_character, 1, 1, NULL, '\r');
259                 rtas_call(display_character, 1, 1, NULL, '\n');
260                 pending_newline = 0;
261         } else {
262                 current_line = 0;
263                 if (form_feed)
264                         rtas_call(display_character, 1, 1, NULL,
265                                   (char)form_feed);
266                 else
267                         rtas_call(display_character, 1, 1, NULL, '\r');
268         }
269  
270         if (row_width)
271                 width = row_width[current_line];
272         else
273                 width = display_width;
274         os = s;
275         while (*os) {
276                 if (*os == '\n' || *os == '\r') {
277                         /* If newline is the last character, save it
278                          * until next call to avoid bumping up the
279                          * display output.
280                          */
281                         if (*os == '\n' && !os[1]) {
282                                 pending_newline = 1;
283                                 current_line++;
284                                 if (current_line > display_lines-1)
285                                         current_line = display_lines-1;
286                                 spin_unlock(&progress_lock);
287                                 return;
288                         }
289  
290                         /* RTAS wants CR-LF, not just LF */
291  
292                         if (*os == '\n') {
293                                 rtas_call(display_character, 1, 1, NULL, '\r');
294                                 rtas_call(display_character, 1, 1, NULL, '\n');
295                         } else {
296                                 /* CR might be used to re-draw a line, so we'll
297                                  * leave it alone and not add LF.
298                                  */
299                                 rtas_call(display_character, 1, 1, NULL, *os);
300                         }
301  
302                         if (row_width)
303                                 width = row_width[current_line];
304                         else
305                                 width = display_width;
306                 } else {
307                         width--;
308                         rtas_call(display_character, 1, 1, NULL, *os);
309                 }
310  
311                 os++;
312  
313                 /* if we overwrite the screen length */
314                 if (width <= 0)
315                         while ((*os != 0) && (*os != '\n') && (*os != '\r'))
316                                 os++;
317         }
318  
319         spin_unlock(&progress_lock);
320 }
321 EXPORT_SYMBOL(rtas_progress);           /* needed by rtas_flash module */
322 
323 int rtas_token(const char *service)
324 {
325         const int *tokp;
326         if (rtas.dev == NULL)
327                 return RTAS_UNKNOWN_SERVICE;
328         tokp = of_get_property(rtas.dev, service, NULL);
329         return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
330 }
331 EXPORT_SYMBOL(rtas_token);
332 
333 int rtas_service_present(const char *service)
334 {
335         return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
336 }
337 EXPORT_SYMBOL(rtas_service_present);
338 
339 #ifdef CONFIG_RTAS_ERROR_LOGGING
340 /*
341  * Return the firmware-specified size of the error log buffer
342  *  for all rtas calls that require an error buffer argument.
343  *  This includes 'check-exception' and 'rtas-last-error'.
344  */
345 int rtas_get_error_log_max(void)
346 {
347         static int rtas_error_log_max;
348         if (rtas_error_log_max)
349                 return rtas_error_log_max;
350 
351         rtas_error_log_max = rtas_token ("rtas-error-log-max");
352         if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
353             (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
354                 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
355                         rtas_error_log_max);
356                 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
357         }
358         return rtas_error_log_max;
359 }
360 EXPORT_SYMBOL(rtas_get_error_log_max);
361 
362 
363 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
364 static int rtas_last_error_token;
365 
366 /** Return a copy of the detailed error text associated with the
367  *  most recent failed call to rtas.  Because the error text
368  *  might go stale if there are any other intervening rtas calls,
369  *  this routine must be called atomically with whatever produced
370  *  the error (i.e. with rtas.lock still held from the previous call).
371  */
372 static char *__fetch_rtas_last_error(char *altbuf)
373 {
374         struct rtas_args err_args, save_args;
375         u32 bufsz;
376         char *buf = NULL;
377 
378         if (rtas_last_error_token == -1)
379                 return NULL;
380 
381         bufsz = rtas_get_error_log_max();
382 
383         err_args.token = rtas_last_error_token;
384         err_args.nargs = 2;
385         err_args.nret = 1;
386         err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
387         err_args.args[1] = bufsz;
388         err_args.args[2] = 0;
389 
390         save_args = rtas.args;
391         rtas.args = err_args;
392 
393         enter_rtas(__pa(&rtas.args));
394 
395         err_args = rtas.args;
396         rtas.args = save_args;
397 
398         /* Log the error in the unlikely case that there was one. */
399         if (unlikely(err_args.args[2] == 0)) {
400                 if (altbuf) {
401                         buf = altbuf;
402                 } else {
403                         buf = rtas_err_buf;
404                         if (mem_init_done)
405                                 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
406                 }
407                 if (buf)
408                         memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
409         }
410 
411         return buf;
412 }
413 
414 #define get_errorlog_buffer()   kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
415 
416 #else /* CONFIG_RTAS_ERROR_LOGGING */
417 #define __fetch_rtas_last_error(x)      NULL
418 #define get_errorlog_buffer()           NULL
419 #endif
420 
421 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
422 {
423         va_list list;
424         int i;
425         unsigned long s;
426         struct rtas_args *rtas_args;
427         char *buff_copy = NULL;
428         int ret;
429 
430         if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
431                 return -1;
432 
433         s = lock_rtas();
434         rtas_args = &rtas.args;
435 
436         rtas_args->token = token;
437         rtas_args->nargs = nargs;
438         rtas_args->nret  = nret;
439         rtas_args->rets  = (rtas_arg_t *)&(rtas_args->args[nargs]);
440         va_start(list, outputs);
441         for (i = 0; i < nargs; ++i)
442                 rtas_args->args[i] = va_arg(list, rtas_arg_t);
443         va_end(list);
444 
445         for (i = 0; i < nret; ++i)
446                 rtas_args->rets[i] = 0;
447 
448         enter_rtas(__pa(rtas_args));
449 
450         /* A -1 return code indicates that the last command couldn't
451            be completed due to a hardware error. */
452         if (rtas_args->rets[0] == -1)
453                 buff_copy = __fetch_rtas_last_error(NULL);
454 
455         if (nret > 1 && outputs != NULL)
456                 for (i = 0; i < nret-1; ++i)
457                         outputs[i] = rtas_args->rets[i+1];
458         ret = (nret > 0)? rtas_args->rets[0]: 0;
459 
460         unlock_rtas(s);
461 
462         if (buff_copy) {
463                 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
464                 if (mem_init_done)
465                         kfree(buff_copy);
466         }
467         return ret;
468 }
469 EXPORT_SYMBOL(rtas_call);
470 
471 /* For RTAS_BUSY (-2), delay for 1 millisecond.  For an extended busy status
472  * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
473  */
474 unsigned int rtas_busy_delay_time(int status)
475 {
476         int order;
477         unsigned int ms = 0;
478 
479         if (status == RTAS_BUSY) {
480                 ms = 1;
481         } else if (status >= 9900 && status <= 9905) {
482                 order = status - 9900;
483                 for (ms = 1; order > 0; order--)
484                         ms *= 10;
485         }
486 
487         return ms;
488 }
489 EXPORT_SYMBOL(rtas_busy_delay_time);
490 
491 /* For an RTAS busy status code, perform the hinted delay. */
492 unsigned int rtas_busy_delay(int status)
493 {
494         unsigned int ms;
495 
496         might_sleep();
497         ms = rtas_busy_delay_time(status);
498         if (ms && need_resched())
499                 msleep(ms);
500 
501         return ms;
502 }
503 EXPORT_SYMBOL(rtas_busy_delay);
504 
505 static int rtas_error_rc(int rtas_rc)
506 {
507         int rc;
508 
509         switch (rtas_rc) {
510                 case -1:                /* Hardware Error */
511                         rc = -EIO;
512                         break;
513                 case -3:                /* Bad indicator/domain/etc */
514                         rc = -EINVAL;
515                         break;
516                 case -9000:             /* Isolation error */
517                         rc = -EFAULT;
518                         break;
519                 case -9001:             /* Outstanding TCE/PTE */
520                         rc = -EEXIST;
521                         break;
522                 case -9002:             /* No usable slot */
523                         rc = -ENODEV;
524                         break;
525                 default:
526                         printk(KERN_ERR "%s: unexpected RTAS error %d\n",
527                                         __func__, rtas_rc);
528                         rc = -ERANGE;
529                         break;
530         }
531         return rc;
532 }
533 
534 int rtas_get_power_level(int powerdomain, int *level)
535 {
536         int token = rtas_token("get-power-level");
537         int rc;
538 
539         if (token == RTAS_UNKNOWN_SERVICE)
540                 return -ENOENT;
541 
542         while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
543                 udelay(1);
544 
545         if (rc < 0)
546                 return rtas_error_rc(rc);
547         return rc;
548 }
549 EXPORT_SYMBOL(rtas_get_power_level);
550 
551 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
552 {
553         int token = rtas_token("set-power-level");
554         int rc;
555 
556         if (token == RTAS_UNKNOWN_SERVICE)
557                 return -ENOENT;
558 
559         do {
560                 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
561         } while (rtas_busy_delay(rc));
562 
563         if (rc < 0)
564                 return rtas_error_rc(rc);
565         return rc;
566 }
567 EXPORT_SYMBOL(rtas_set_power_level);
568 
569 int rtas_get_sensor(int sensor, int index, int *state)
570 {
571         int token = rtas_token("get-sensor-state");
572         int rc;
573 
574         if (token == RTAS_UNKNOWN_SERVICE)
575                 return -ENOENT;
576 
577         do {
578                 rc = rtas_call(token, 2, 2, state, sensor, index);
579         } while (rtas_busy_delay(rc));
580 
581         if (rc < 0)
582                 return rtas_error_rc(rc);
583         return rc;
584 }
585 EXPORT_SYMBOL(rtas_get_sensor);
586 
587 bool rtas_indicator_present(int token, int *maxindex)
588 {
589         int proplen, count, i;
590         const struct indicator_elem {
591                 u32 token;
592                 u32 maxindex;
593         } *indicators;
594 
595         indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
596         if (!indicators)
597                 return false;
598 
599         count = proplen / sizeof(struct indicator_elem);
600 
601         for (i = 0; i < count; i++) {
602                 if (indicators[i].token != token)
603                         continue;
604                 if (maxindex)
605                         *maxindex = indicators[i].maxindex;
606                 return true;
607         }
608 
609         return false;
610 }
611 EXPORT_SYMBOL(rtas_indicator_present);
612 
613 int rtas_set_indicator(int indicator, int index, int new_value)
614 {
615         int token = rtas_token("set-indicator");
616         int rc;
617 
618         if (token == RTAS_UNKNOWN_SERVICE)
619                 return -ENOENT;
620 
621         do {
622                 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
623         } while (rtas_busy_delay(rc));
624 
625         if (rc < 0)
626                 return rtas_error_rc(rc);
627         return rc;
628 }
629 EXPORT_SYMBOL(rtas_set_indicator);
630 
631 /*
632  * Ignoring RTAS extended delay
633  */
634 int rtas_set_indicator_fast(int indicator, int index, int new_value)
635 {
636         int rc;
637         int token = rtas_token("set-indicator");
638 
639         if (token == RTAS_UNKNOWN_SERVICE)
640                 return -ENOENT;
641 
642         rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
643 
644         WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));
645 
646         if (rc < 0)
647                 return rtas_error_rc(rc);
648 
649         return rc;
650 }
651 
652 void rtas_restart(char *cmd)
653 {
654         if (rtas_flash_term_hook)
655                 rtas_flash_term_hook(SYS_RESTART);
656         printk("RTAS system-reboot returned %d\n",
657                rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
658         for (;;);
659 }
660 
661 void rtas_power_off(void)
662 {
663         if (rtas_flash_term_hook)
664                 rtas_flash_term_hook(SYS_POWER_OFF);
665         /* allow power on only with power button press */
666         printk("RTAS power-off returned %d\n",
667                rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
668         for (;;);
669 }
670 
671 void rtas_halt(void)
672 {
673         if (rtas_flash_term_hook)
674                 rtas_flash_term_hook(SYS_HALT);
675         /* allow power on only with power button press */
676         printk("RTAS power-off returned %d\n",
677                rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
678         for (;;);
679 }
680 
681 /* Must be in the RMO region, so we place it here */
682 static char rtas_os_term_buf[2048];
683 
684 void rtas_os_term(char *str)
685 {
686         int status;
687 
688         /*
689          * Firmware with the ibm,extended-os-term property is guaranteed
690          * to always return from an ibm,os-term call. Earlier versions without
691          * this property may terminate the partition which we want to avoid
692          * since it interferes with panic_timeout.
693          */
694         if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
695             RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
696                 return;
697 
698         snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
699 
700         do {
701                 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
702                                    __pa(rtas_os_term_buf));
703         } while (rtas_busy_delay(status));
704 
705         if (status != 0)
706                 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
707 }
708 
709 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
710 #ifdef CONFIG_PPC_PSERIES
711 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
712 {
713         u16 slb_size = mmu_slb_size;
714         int rc = H_MULTI_THREADS_ACTIVE;
715         int cpu;
716 
717         slb_set_size(SLB_MIN_SIZE);
718         printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
719 
720         while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
721                !atomic_read(&data->error))
722                 rc = rtas_call(data->token, 0, 1, NULL);
723 
724         if (rc || atomic_read(&data->error)) {
725                 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
726                 slb_set_size(slb_size);
727         }
728 
729         if (atomic_read(&data->error))
730                 rc = atomic_read(&data->error);
731 
732         atomic_set(&data->error, rc);
733         pSeries_coalesce_init();
734 
735         if (wake_when_done) {
736                 atomic_set(&data->done, 1);
737 
738                 for_each_online_cpu(cpu)
739                         plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
740         }
741 
742         if (atomic_dec_return(&data->working) == 0)
743                 complete(data->complete);
744 
745         return rc;
746 }
747 
748 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
749 {
750         atomic_inc(&data->working);
751         return __rtas_suspend_last_cpu(data, 0);
752 }
753 
754 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
755 {
756         long rc = H_SUCCESS;
757         unsigned long msr_save;
758         int cpu;
759 
760         atomic_inc(&data->working);
761 
762         /* really need to ensure MSR.EE is off for H_JOIN */
763         msr_save = mfmsr();
764         mtmsr(msr_save & ~(MSR_EE));
765 
766         while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
767                 rc = plpar_hcall_norets(H_JOIN);
768 
769         mtmsr(msr_save);
770 
771         if (rc == H_SUCCESS) {
772                 /* This cpu was prodded and the suspend is complete. */
773                 goto out;
774         } else if (rc == H_CONTINUE) {
775                 /* All other cpus are in H_JOIN, this cpu does
776                  * the suspend.
777                  */
778                 return __rtas_suspend_last_cpu(data, wake_when_done);
779         } else {
780                 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
781                        smp_processor_id(), rc);
782                 atomic_set(&data->error, rc);
783         }
784 
785         if (wake_when_done) {
786                 atomic_set(&data->done, 1);
787 
788                 /* This cpu did the suspend or got an error; in either case,
789                  * we need to prod all other other cpus out of join state.
790                  * Extra prods are harmless.
791                  */
792                 for_each_online_cpu(cpu)
793                         plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
794         }
795 out:
796         if (atomic_dec_return(&data->working) == 0)
797                 complete(data->complete);
798         return rc;
799 }
800 
801 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
802 {
803         return __rtas_suspend_cpu(data, 0);
804 }
805 
806 static void rtas_percpu_suspend_me(void *info)
807 {
808         __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
809 }
810 
811 enum rtas_cpu_state {
812         DOWN,
813         UP,
814 };
815 
816 #ifndef CONFIG_SMP
817 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
818                                 cpumask_var_t cpus)
819 {
820         if (!cpumask_empty(cpus)) {
821                 cpumask_clear(cpus);
822                 return -EINVAL;
823         } else
824                 return 0;
825 }
826 #else
827 /* On return cpumask will be altered to indicate CPUs changed.
828  * CPUs with states changed will be set in the mask,
829  * CPUs with status unchanged will be unset in the mask. */
830 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
831                                 cpumask_var_t cpus)
832 {
833         int cpu;
834         int cpuret = 0;
835         int ret = 0;
836 
837         if (cpumask_empty(cpus))
838                 return 0;
839 
840         for_each_cpu(cpu, cpus) {
841                 switch (state) {
842                 case DOWN:
843                         cpuret = cpu_down(cpu);
844                         break;
845                 case UP:
846                         cpuret = cpu_up(cpu);
847                         break;
848                 }
849                 if (cpuret) {
850                         pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
851                                         __func__,
852                                         ((state == UP) ? "up" : "down"),
853                                         cpu, cpuret);
854                         if (!ret)
855                                 ret = cpuret;
856                         if (state == UP) {
857                                 /* clear bits for unchanged cpus, return */
858                                 cpumask_shift_right(cpus, cpus, cpu);
859                                 cpumask_shift_left(cpus, cpus, cpu);
860                                 break;
861                         } else {
862                                 /* clear bit for unchanged cpu, continue */
863                                 cpumask_clear_cpu(cpu, cpus);
864                         }
865                 }
866         }
867 
868         return ret;
869 }
870 #endif
871 
872 int rtas_online_cpus_mask(cpumask_var_t cpus)
873 {
874         int ret;
875 
876         ret = rtas_cpu_state_change_mask(UP, cpus);
877 
878         if (ret) {
879                 cpumask_var_t tmp_mask;
880 
881                 if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY))
882                         return ret;
883 
884                 /* Use tmp_mask to preserve cpus mask from first failure */
885                 cpumask_copy(tmp_mask, cpus);
886                 rtas_offline_cpus_mask(tmp_mask);
887                 free_cpumask_var(tmp_mask);
888         }
889 
890         return ret;
891 }
892 EXPORT_SYMBOL(rtas_online_cpus_mask);
893 
894 int rtas_offline_cpus_mask(cpumask_var_t cpus)
895 {
896         return rtas_cpu_state_change_mask(DOWN, cpus);
897 }
898 EXPORT_SYMBOL(rtas_offline_cpus_mask);
899 
900 int rtas_ibm_suspend_me(struct rtas_args *args)
901 {
902         long state;
903         long rc;
904         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
905         struct rtas_suspend_me_data data;
906         DECLARE_COMPLETION_ONSTACK(done);
907         cpumask_var_t offline_mask;
908         int cpuret;
909 
910         if (!rtas_service_present("ibm,suspend-me"))
911                 return -ENOSYS;
912 
913         /* Make sure the state is valid */
914         rc = plpar_hcall(H_VASI_STATE, retbuf,
915                          ((u64)args->args[0] << 32) | args->args[1]);
916 
917         state = retbuf[0];
918 
919         if (rc) {
920                 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
921                 return rc;
922         } else if (state == H_VASI_ENABLED) {
923                 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
924                 return 0;
925         } else if (state != H_VASI_SUSPENDING) {
926                 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
927                        state);
928                 args->args[args->nargs] = -1;
929                 return 0;
930         }
931 
932         if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY))
933                 return -ENOMEM;
934 
935         atomic_set(&data.working, 0);
936         atomic_set(&data.done, 0);
937         atomic_set(&data.error, 0);
938         data.token = rtas_token("ibm,suspend-me");
939         data.complete = &done;
940 
941         /* All present CPUs must be online */
942         cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
943         cpuret = rtas_online_cpus_mask(offline_mask);
944         if (cpuret) {
945                 pr_err("%s: Could not bring present CPUs online.\n", __func__);
946                 atomic_set(&data.error, cpuret);
947                 goto out;
948         }
949 
950         stop_topology_update();
951 
952         /* Call function on all CPUs.  One of us will make the
953          * rtas call
954          */
955         if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
956                 atomic_set(&data.error, -EINVAL);
957 
958         wait_for_completion(&done);
959 
960         if (atomic_read(&data.error) != 0)
961                 printk(KERN_ERR "Error doing global join\n");
962 
963         start_topology_update();
964 
965         /* Take down CPUs not online prior to suspend */
966         cpuret = rtas_offline_cpus_mask(offline_mask);
967         if (cpuret)
968                 pr_warn("%s: Could not restore CPUs to offline state.\n",
969                                 __func__);
970 
971 out:
972         free_cpumask_var(offline_mask);
973         return atomic_read(&data.error);
974 }
975 #else /* CONFIG_PPC_PSERIES */
976 int rtas_ibm_suspend_me(struct rtas_args *args)
977 {
978         return -ENOSYS;
979 }
980 #endif
981 
982 /**
983  * Find a specific pseries error log in an RTAS extended event log.
984  * @log: RTAS error/event log
985  * @section_id: two character section identifier
986  *
987  * Returns a pointer to the specified errorlog or NULL if not found.
988  */
989 struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
990                                               uint16_t section_id)
991 {
992         struct rtas_ext_event_log_v6 *ext_log =
993                 (struct rtas_ext_event_log_v6 *)log->buffer;
994         struct pseries_errorlog *sect;
995         unsigned char *p, *log_end;
996 
997         /* Check that we understand the format */
998         if (log->extended_log_length < sizeof(struct rtas_ext_event_log_v6) ||
999             ext_log->log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
1000             ext_log->company_id != RTAS_V6EXT_COMPANY_ID_IBM)
1001                 return NULL;
1002 
1003         log_end = log->buffer + log->extended_log_length;
1004         p = ext_log->vendor_log;
1005 
1006         while (p < log_end) {
1007                 sect = (struct pseries_errorlog *)p;
1008                 if (sect->id == section_id)
1009                         return sect;
1010                 p += sect->length;
1011         }
1012 
1013         return NULL;
1014 }
1015 
1016 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
1017 {
1018         struct rtas_args args;
1019         unsigned long flags;
1020         char *buff_copy, *errbuf = NULL;
1021         int nargs;
1022         int rc;
1023 
1024         if (!capable(CAP_SYS_ADMIN))
1025                 return -EPERM;
1026 
1027         if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1028                 return -EFAULT;
1029 
1030         nargs = args.nargs;
1031         if (nargs > ARRAY_SIZE(args.args)
1032             || args.nret > ARRAY_SIZE(args.args)
1033             || nargs + args.nret > ARRAY_SIZE(args.args))
1034                 return -EINVAL;
1035 
1036         /* Copy in args. */
1037         if (copy_from_user(args.args, uargs->args,
1038                            nargs * sizeof(rtas_arg_t)) != 0)
1039                 return -EFAULT;
1040 
1041         if (args.token == RTAS_UNKNOWN_SERVICE)
1042                 return -EINVAL;
1043 
1044         args.rets = &args.args[nargs];
1045         memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
1046 
1047         /* Need to handle ibm,suspend_me call specially */
1048         if (args.token == ibm_suspend_me_token) {
1049                 rc = rtas_ibm_suspend_me(&args);
1050                 if (rc)
1051                         return rc;
1052                 goto copy_return;
1053         }
1054 
1055         buff_copy = get_errorlog_buffer();
1056 
1057         flags = lock_rtas();
1058 
1059         rtas.args = args;
1060         enter_rtas(__pa(&rtas.args));
1061         args = rtas.args;
1062 
1063         /* A -1 return code indicates that the last command couldn't
1064            be completed due to a hardware error. */
1065         if (args.rets[0] == -1)
1066                 errbuf = __fetch_rtas_last_error(buff_copy);
1067 
1068         unlock_rtas(flags);
1069 
1070         if (buff_copy) {
1071                 if (errbuf)
1072                         log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1073                 kfree(buff_copy);
1074         }
1075 
1076  copy_return:
1077         /* Copy out args. */
1078         if (copy_to_user(uargs->args + nargs,
1079                          args.args + nargs,
1080                          args.nret * sizeof(rtas_arg_t)) != 0)
1081                 return -EFAULT;
1082 
1083         return 0;
1084 }
1085 
1086 /*
1087  * Call early during boot, before mem init or bootmem, to retrieve the RTAS
1088  * informations from the device-tree and allocate the RMO buffer for userland
1089  * accesses.
1090  */
1091 void __init rtas_initialize(void)
1092 {
1093         unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1094 
1095         /* Get RTAS dev node and fill up our "rtas" structure with infos
1096          * about it.
1097          */
1098         rtas.dev = of_find_node_by_name(NULL, "rtas");
1099         if (rtas.dev) {
1100                 const u32 *basep, *entryp, *sizep;
1101 
1102                 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
1103                 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
1104                 if (basep != NULL && sizep != NULL) {
1105                         rtas.base = *basep;
1106                         rtas.size = *sizep;
1107                         entryp = of_get_property(rtas.dev,
1108                                         "linux,rtas-entry", NULL);
1109                         if (entryp == NULL) /* Ugh */
1110                                 rtas.entry = rtas.base;
1111                         else
1112                                 rtas.entry = *entryp;
1113                 } else
1114                         rtas.dev = NULL;
1115         }
1116         if (!rtas.dev)
1117                 return;
1118 
1119         /* If RTAS was found, allocate the RMO buffer for it and look for
1120          * the stop-self token if any
1121          */
1122 #ifdef CONFIG_PPC64
1123         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
1124                 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1125                 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
1126         }
1127 #endif
1128         rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
1129 
1130 #ifdef CONFIG_RTAS_ERROR_LOGGING
1131         rtas_last_error_token = rtas_token("rtas-last-error");
1132 #endif
1133 }
1134 
1135 int __init early_init_dt_scan_rtas(unsigned long node,
1136                 const char *uname, int depth, void *data)
1137 {
1138         u32 *basep, *entryp, *sizep;
1139 
1140         if (depth != 1 || strcmp(uname, "rtas") != 0)
1141                 return 0;
1142 
1143         basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1144         entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1145         sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);
1146 
1147         if (basep && entryp && sizep) {
1148                 rtas.base = *basep;
1149                 rtas.entry = *entryp;
1150                 rtas.size = *sizep;
1151         }
1152 
1153 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1154         basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1155         if (basep)
1156                 rtas_putchar_token = *basep;
1157 
1158         basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1159         if (basep)
1160                 rtas_getchar_token = *basep;
1161 
1162         if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1163             rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1164                 udbg_init_rtas_console();
1165 
1166 #endif
1167 
1168         /* break now */
1169         return 1;
1170 }
1171 
1172 static arch_spinlock_t timebase_lock;
1173 static u64 timebase = 0;
1174 
1175 void __cpuinit rtas_give_timebase(void)
1176 {
1177         unsigned long flags;
1178 
1179         local_irq_save(flags);
1180         hard_irq_disable();
1181         arch_spin_lock(&timebase_lock);
1182         rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1183         timebase = get_tb();
1184         arch_spin_unlock(&timebase_lock);
1185 
1186         while (timebase)
1187                 barrier();
1188         rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1189         local_irq_restore(flags);
1190 }
1191 
1192 void __cpuinit rtas_take_timebase(void)
1193 {
1194         while (!timebase)
1195                 barrier();
1196         arch_spin_lock(&timebase_lock);
1197         set_tb(timebase >> 32, timebase & 0xffffffff);
1198         timebase = 0;
1199         arch_spin_unlock(&timebase_lock);
1200 }
1201 

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