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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 /* This is here deliberately so it's only used in this file */
 48 void enter_rtas(unsigned long);
 49 
 50 struct rtas_t rtas = {
 51         .lock = __ARCH_SPIN_LOCK_UNLOCKED
 52 };
 53 EXPORT_SYMBOL(rtas);
 54 
 55 DEFINE_SPINLOCK(rtas_data_buf_lock);
 56 EXPORT_SYMBOL(rtas_data_buf_lock);
 57 
 58 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
 59 EXPORT_SYMBOL(rtas_data_buf);
 60 
 61 unsigned long rtas_rmo_buf;
 62 
 63 /*
 64  * If non-NULL, this gets called when the kernel terminates.
 65  * This is done like this so rtas_flash can be a module.
 66  */
 67 void (*rtas_flash_term_hook)(int);
 68 EXPORT_SYMBOL(rtas_flash_term_hook);
 69 
 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
 74  */
 75 static unsigned long lock_rtas(void)
 76 {
 77         unsigned long flags;
 78 
 79         local_irq_save(flags);
 80         preempt_disable();
 81         arch_spin_lock_flags(&rtas.lock, flags);
 82         return flags;
 83 }
 84 
 85 static void unlock_rtas(unsigned long flags)
 86 {
 87         arch_spin_unlock(&rtas.lock);
 88         local_irq_restore(flags);
 89         preempt_enable();
 90 }
 91 
 92 /*
 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.
 96  */
 97 static void call_rtas_display_status(unsigned char c)
 98 {
 99         unsigned long s;
100 
101         if (!rtas.base)
102                 return;
103 
104         s = lock_rtas();
105         rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
106         unlock_rtas(s);
107 }
108 
109 static void call_rtas_display_status_delay(char c)
110 {
111         static int pending_newline = 0;  /* did last write end with unprinted newline? */
112         static int width = 16;
113 
114         if (c == '\n') {        
115                 while (width-- > 0)
116                         call_rtas_display_status(' ');
117                 width = 16;
118                 mdelay(500);
119                 pending_newline = 1;
120         } else {
121                 if (pending_newline) {
122                         call_rtas_display_status('\r');
123                         call_rtas_display_status('\n');
124                 } 
125                 pending_newline = 0;
126                 if (width--) {
127                         call_rtas_display_status(c);
128                         udelay(10000);
129                 }
130         }
131 }
132 
133 void __init udbg_init_rtas_panel(void)
134 {
135         udbg_putc = call_rtas_display_status_delay;
136 }
137 
138 #ifdef CONFIG_UDBG_RTAS_CONSOLE
139 
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.
143  */
144 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
145 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
146 
147 static void udbg_rtascon_putc(char c)
148 {
149         int tries;
150 
151         if (!rtas.base)
152                 return;
153 
154         /* Add CRs before LFs */
155         if (c == '\n')
156                 udbg_rtascon_putc('\r');
157 
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)
161                         break;
162                 udelay(1000);
163         }
164 }
165 
166 static int udbg_rtascon_getc_poll(void)
167 {
168         int c;
169 
170         if (!rtas.base)
171                 return -1;
172 
173         if (rtas_call(rtas_getchar_token, 0, 2, &c))
174                 return -1;
175 
176         return c;
177 }
178 
179 static int udbg_rtascon_getc(void)
180 {
181         int c;
182 
183         while ((c = udbg_rtascon_getc_poll()) == -1)
184                 ;
185 
186         return c;
187 }
188 
189 
190 void __init udbg_init_rtas_console(void)
191 {
192         udbg_putc = udbg_rtascon_putc;
193         udbg_getc = udbg_rtascon_getc;
194         udbg_getc_poll = udbg_rtascon_getc_poll;
195 }
196 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
197 
198 void rtas_progress(char *s, unsigned short hex)
199 {
200         struct device_node *root;
201         int width;
202         const __be32 *p;
203         char *os;
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? */
210 
211         if (!rtas.base)
212                 return;
213 
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);
228                         of_node_put(root);
229                 }
230                 display_character = rtas_token("display-character");
231                 set_indicator = rtas_token("set-indicator");
232         }
233 
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);
238                 return;
239         }
240 
241         spin_lock(&progress_lock);
242 
243         /*
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
246          * instead.
247          *
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.
251          */
252         if (pending_newline) {
253                 rtas_call(display_character, 1, 1, NULL, '\r');
254                 rtas_call(display_character, 1, 1, NULL, '\n');
255                 pending_newline = 0;
256         } else {
257                 current_line = 0;
258                 if (form_feed)
259                         rtas_call(display_character, 1, 1, NULL,
260                                   (char)form_feed);
261                 else
262                         rtas_call(display_character, 1, 1, NULL, '\r');
263         }
264  
265         if (row_width)
266                 width = row_width[current_line];
267         else
268                 width = display_width;
269         os = s;
270         while (*os) {
271                 if (*os == '\n' || *os == '\r') {
272                         /* If newline is the last character, save it
273                          * until next call to avoid bumping up the
274                          * display output.
275                          */
276                         if (*os == '\n' && !os[1]) {
277                                 pending_newline = 1;
278                                 current_line++;
279                                 if (current_line > display_lines-1)
280                                         current_line = display_lines-1;
281                                 spin_unlock(&progress_lock);
282                                 return;
283                         }
284  
285                         /* RTAS wants CR-LF, not just LF */
286  
287                         if (*os == '\n') {
288                                 rtas_call(display_character, 1, 1, NULL, '\r');
289                                 rtas_call(display_character, 1, 1, NULL, '\n');
290                         } else {
291                                 /* CR might be used to re-draw a line, so we'll
292                                  * leave it alone and not add LF.
293                                  */
294                                 rtas_call(display_character, 1, 1, NULL, *os);
295                         }
296  
297                         if (row_width)
298                                 width = row_width[current_line];
299                         else
300                                 width = display_width;
301                 } else {
302                         width--;
303                         rtas_call(display_character, 1, 1, NULL, *os);
304                 }
305  
306                 os++;
307  
308                 /* if we overwrite the screen length */
309                 if (width <= 0)
310                         while ((*os != 0) && (*os != '\n') && (*os != '\r'))
311                                 os++;
312         }
313  
314         spin_unlock(&progress_lock);
315 }
316 EXPORT_SYMBOL(rtas_progress);           /* needed by rtas_flash module */
317 
318 int rtas_token(const char *service)
319 {
320         const __be32 *tokp;
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;
325 }
326 EXPORT_SYMBOL(rtas_token);
327 
328 int rtas_service_present(const char *service)
329 {
330         return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
331 }
332 EXPORT_SYMBOL(rtas_service_present);
333 
334 #ifdef CONFIG_RTAS_ERROR_LOGGING
335 /*
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'.
339  */
340 int rtas_get_error_log_max(void)
341 {
342         static int rtas_error_log_max;
343         if (rtas_error_log_max)
344                 return rtas_error_log_max;
345 
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",
350                         rtas_error_log_max);
351                 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
352         }
353         return rtas_error_log_max;
354 }
355 EXPORT_SYMBOL(rtas_get_error_log_max);
356 
357 
358 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
359 static int rtas_last_error_token;
360 
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).
366  */
367 static char *__fetch_rtas_last_error(char *altbuf)
368 {
369         struct rtas_args err_args, save_args;
370         u32 bufsz;
371         char *buf = NULL;
372 
373         if (rtas_last_error_token == -1)
374                 return NULL;
375 
376         bufsz = rtas_get_error_log_max();
377 
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;
384 
385         save_args = rtas.args;
386         rtas.args = err_args;
387 
388         enter_rtas(__pa(&rtas.args));
389 
390         err_args = rtas.args;
391         rtas.args = save_args;
392 
393         /* Log the error in the unlikely case that there was one. */
394         if (unlikely(err_args.args[2] == 0)) {
395                 if (altbuf) {
396                         buf = altbuf;
397                 } else {
398                         buf = rtas_err_buf;
399                         if (slab_is_available())
400                                 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
401                 }
402                 if (buf)
403                         memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
404         }
405 
406         return buf;
407 }
408 
409 #define get_errorlog_buffer()   kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
410 
411 #else /* CONFIG_RTAS_ERROR_LOGGING */
412 #define __fetch_rtas_last_error(x)      NULL
413 #define get_errorlog_buffer()           NULL
414 #endif
415 
416 
417 static void
418 va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
419                       va_list list)
420 {
421         int i;
422 
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]);
427 
428         for (i = 0; i < nargs; ++i)
429                 args->args[i] = cpu_to_be32(va_arg(list, __u32));
430 
431         for (i = 0; i < nret; ++i)
432                 args->rets[i] = 0;
433 
434         enter_rtas(__pa(args));
435 }
436 
437 void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
438 {
439         va_list list;
440 
441         va_start(list, nret);
442         va_rtas_call_unlocked(args, token, nargs, nret, list);
443         va_end(list);
444 }
445 
446 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
447 {
448         va_list list;
449         int i;
450         unsigned long s;
451         struct rtas_args *rtas_args;
452         char *buff_copy = NULL;
453         int ret;
454 
455         if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
456                 return -1;
457 
458         s = lock_rtas();
459 
460         /* We use the global rtas args buffer */
461         rtas_args = &rtas.args;
462 
463         va_start(list, outputs);
464         va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
465         va_end(list);
466 
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);
471 
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;
476 
477         unlock_rtas(s);
478 
479         if (buff_copy) {
480                 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
481                 if (slab_is_available())
482                         kfree(buff_copy);
483         }
484         return ret;
485 }
486 EXPORT_SYMBOL(rtas_call);
487 
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.
490  */
491 unsigned int rtas_busy_delay_time(int status)
492 {
493         int order;
494         unsigned int ms = 0;
495 
496         if (status == RTAS_BUSY) {
497                 ms = 1;
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--)
502                         ms *= 10;
503         }
504 
505         return ms;
506 }
507 EXPORT_SYMBOL(rtas_busy_delay_time);
508 
509 /* For an RTAS busy status code, perform the hinted delay. */
510 unsigned int rtas_busy_delay(int status)
511 {
512         unsigned int ms;
513 
514         might_sleep();
515         ms = rtas_busy_delay_time(status);
516         if (ms && need_resched())
517                 msleep(ms);
518 
519         return ms;
520 }
521 EXPORT_SYMBOL(rtas_busy_delay);
522 
523 static int rtas_error_rc(int rtas_rc)
524 {
525         int rc;
526 
527         switch (rtas_rc) {
528                 case -1:                /* Hardware Error */
529                         rc = -EIO;
530                         break;
531                 case -3:                /* Bad indicator/domain/etc */
532                         rc = -EINVAL;
533                         break;
534                 case -9000:             /* Isolation error */
535                         rc = -EFAULT;
536                         break;
537                 case -9001:             /* Outstanding TCE/PTE */
538                         rc = -EEXIST;
539                         break;
540                 case -9002:             /* No usable slot */
541                         rc = -ENODEV;
542                         break;
543                 default:
544                         printk(KERN_ERR "%s: unexpected RTAS error %d\n",
545                                         __func__, rtas_rc);
546                         rc = -ERANGE;
547                         break;
548         }
549         return rc;
550 }
551 
552 int rtas_get_power_level(int powerdomain, int *level)
553 {
554         int token = rtas_token("get-power-level");
555         int rc;
556 
557         if (token == RTAS_UNKNOWN_SERVICE)
558                 return -ENOENT;
559 
560         while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
561                 udelay(1);
562 
563         if (rc < 0)
564                 return rtas_error_rc(rc);
565         return rc;
566 }
567 EXPORT_SYMBOL(rtas_get_power_level);
568 
569 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
570 {
571         int token = rtas_token("set-power-level");
572         int rc;
573 
574         if (token == RTAS_UNKNOWN_SERVICE)
575                 return -ENOENT;
576 
577         do {
578                 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
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_set_power_level);
586 
587 int rtas_get_sensor(int sensor, int index, int *state)
588 {
589         int token = rtas_token("get-sensor-state");
590         int rc;
591 
592         if (token == RTAS_UNKNOWN_SERVICE)
593                 return -ENOENT;
594 
595         do {
596                 rc = rtas_call(token, 2, 2, state, sensor, index);
597         } while (rtas_busy_delay(rc));
598 
599         if (rc < 0)
600                 return rtas_error_rc(rc);
601         return rc;
602 }
603 EXPORT_SYMBOL(rtas_get_sensor);
604 
605 int rtas_get_sensor_fast(int sensor, int index, int *state)
606 {
607         int token = rtas_token("get-sensor-state");
608         int rc;
609 
610         if (token == RTAS_UNKNOWN_SERVICE)
611                 return -ENOENT;
612 
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));
616 
617         if (rc < 0)
618                 return rtas_error_rc(rc);
619         return rc;
620 }
621 
622 bool rtas_indicator_present(int token, int *maxindex)
623 {
624         int proplen, count, i;
625         const struct indicator_elem {
626                 __be32 token;
627                 __be32 maxindex;
628         } *indicators;
629 
630         indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
631         if (!indicators)
632                 return false;
633 
634         count = proplen / sizeof(struct indicator_elem);
635 
636         for (i = 0; i < count; i++) {
637                 if (__be32_to_cpu(indicators[i].token) != token)
638                         continue;
639                 if (maxindex)
640                         *maxindex = __be32_to_cpu(indicators[i].maxindex);
641                 return true;
642         }
643 
644         return false;
645 }
646 EXPORT_SYMBOL(rtas_indicator_present);
647 
648 int rtas_set_indicator(int indicator, int index, int new_value)
649 {
650         int token = rtas_token("set-indicator");
651         int rc;
652 
653         if (token == RTAS_UNKNOWN_SERVICE)
654                 return -ENOENT;
655 
656         do {
657                 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
658         } while (rtas_busy_delay(rc));
659 
660         if (rc < 0)
661                 return rtas_error_rc(rc);
662         return rc;
663 }
664 EXPORT_SYMBOL(rtas_set_indicator);
665 
666 /*
667  * Ignoring RTAS extended delay
668  */
669 int rtas_set_indicator_fast(int indicator, int index, int new_value)
670 {
671         int rc;
672         int token = rtas_token("set-indicator");
673 
674         if (token == RTAS_UNKNOWN_SERVICE)
675                 return -ENOENT;
676 
677         rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
678 
679         WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
680                                     rc <= RTAS_EXTENDED_DELAY_MAX));
681 
682         if (rc < 0)
683                 return rtas_error_rc(rc);
684 
685         return rc;
686 }
687 
688 void __noreturn rtas_restart(char *cmd)
689 {
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));
694         for (;;);
695 }
696 
697 void rtas_power_off(void)
698 {
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));
704         for (;;);
705 }
706 
707 void __noreturn rtas_halt(void)
708 {
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));
714         for (;;);
715 }
716 
717 /* Must be in the RMO region, so we place it here */
718 static char rtas_os_term_buf[2048];
719 
720 void rtas_os_term(char *str)
721 {
722         int status;
723 
724         /*
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.
729          */
730         if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
731             RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
732                 return;
733 
734         snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
735 
736         do {
737                 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
738                                    __pa(rtas_os_term_buf));
739         } while (rtas_busy_delay(status));
740 
741         if (status != 0)
742                 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
743 }
744 
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)
748 {
749         u16 slb_size = mmu_slb_size;
750         int rc = H_MULTI_THREADS_ACTIVE;
751         int cpu;
752 
753         slb_set_size(SLB_MIN_SIZE);
754         printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
755 
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);
759 
760         if (rc || atomic_read(&data->error)) {
761                 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
762                 slb_set_size(slb_size);
763         }
764 
765         if (atomic_read(&data->error))
766                 rc = atomic_read(&data->error);
767 
768         atomic_set(&data->error, rc);
769         pSeries_coalesce_init();
770 
771         if (wake_when_done) {
772                 atomic_set(&data->done, 1);
773 
774                 for_each_online_cpu(cpu)
775                         plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
776         }
777 
778         if (atomic_dec_return(&data->working) == 0)
779                 complete(data->complete);
780 
781         return rc;
782 }
783 
784 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
785 {
786         atomic_inc(&data->working);
787         return __rtas_suspend_last_cpu(data, 0);
788 }
789 
790 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
791 {
792         long rc = H_SUCCESS;
793         unsigned long msr_save;
794         int cpu;
795 
796         atomic_inc(&data->working);
797 
798         /* really need to ensure MSR.EE is off for H_JOIN */
799         msr_save = mfmsr();
800         mtmsr(msr_save & ~(MSR_EE));
801 
802         while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
803                 rc = plpar_hcall_norets(H_JOIN);
804 
805         mtmsr(msr_save);
806 
807         if (rc == H_SUCCESS) {
808                 /* This cpu was prodded and the suspend is complete. */
809                 goto out;
810         } else if (rc == H_CONTINUE) {
811                 /* All other cpus are in H_JOIN, this cpu does
812                  * the suspend.
813                  */
814                 return __rtas_suspend_last_cpu(data, wake_when_done);
815         } else {
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);
819         }
820 
821         if (wake_when_done) {
822                 atomic_set(&data->done, 1);
823 
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.
827                  */
828                 for_each_online_cpu(cpu)
829                         plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
830         }
831 out:
832         if (atomic_dec_return(&data->working) == 0)
833                 complete(data->complete);
834         return rc;
835 }
836 
837 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
838 {
839         return __rtas_suspend_cpu(data, 0);
840 }
841 
842 static void rtas_percpu_suspend_me(void *info)
843 {
844         __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
845 }
846 
847 enum rtas_cpu_state {
848         DOWN,
849         UP,
850 };
851 
852 #ifndef CONFIG_SMP
853 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
854                                 cpumask_var_t cpus)
855 {
856         if (!cpumask_empty(cpus)) {
857                 cpumask_clear(cpus);
858                 return -EINVAL;
859         } else
860                 return 0;
861 }
862 #else
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,
867                                 cpumask_var_t cpus)
868 {
869         int cpu;
870         int cpuret = 0;
871         int ret = 0;
872 
873         if (cpumask_empty(cpus))
874                 return 0;
875 
876         for_each_cpu(cpu, cpus) {
877                 switch (state) {
878                 case DOWN:
879                         cpuret = cpu_down(cpu);
880                         break;
881                 case UP:
882                         cpuret = cpu_up(cpu);
883                         break;
884                 }
885                 if (cpuret) {
886                         pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
887                                         __func__,
888                                         ((state == UP) ? "up" : "down"),
889                                         cpu, cpuret);
890                         if (!ret)
891                                 ret = cpuret;
892                         if (state == UP) {
893                                 /* clear bits for unchanged cpus, return */
894                                 cpumask_shift_right(cpus, cpus, cpu);
895                                 cpumask_shift_left(cpus, cpus, cpu);
896                                 break;
897                         } else {
898                                 /* clear bit for unchanged cpu, continue */
899                                 cpumask_clear_cpu(cpu, cpus);
900                         }
901                 }
902         }
903 
904         return ret;
905 }
906 #endif
907 
908 int rtas_online_cpus_mask(cpumask_var_t cpus)
909 {
910         int ret;
911 
912         ret = rtas_cpu_state_change_mask(UP, cpus);
913 
914         if (ret) {
915                 cpumask_var_t tmp_mask;
916 
917                 if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY))
918                         return ret;
919 
920                 /* Use tmp_mask to preserve cpus mask from first failure */
921                 cpumask_copy(tmp_mask, cpus);
922                 rtas_offline_cpus_mask(tmp_mask);
923                 free_cpumask_var(tmp_mask);
924         }
925 
926         return ret;
927 }
928 EXPORT_SYMBOL(rtas_online_cpus_mask);
929 
930 int rtas_offline_cpus_mask(cpumask_var_t cpus)
931 {
932         return rtas_cpu_state_change_mask(DOWN, cpus);
933 }
934 EXPORT_SYMBOL(rtas_offline_cpus_mask);
935 
936 int rtas_ibm_suspend_me(u64 handle)
937 {
938         long state;
939         long rc;
940         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
941         struct rtas_suspend_me_data data;
942         DECLARE_COMPLETION_ONSTACK(done);
943         cpumask_var_t offline_mask;
944         int cpuret;
945 
946         if (!rtas_service_present("ibm,suspend-me"))
947                 return -ENOSYS;
948 
949         /* Make sure the state is valid */
950         rc = plpar_hcall(H_VASI_STATE, retbuf, handle);
951 
952         state = retbuf[0];
953 
954         if (rc) {
955                 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
956                 return rc;
957         } else if (state == H_VASI_ENABLED) {
958                 return -EAGAIN;
959         } else if (state != H_VASI_SUSPENDING) {
960                 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
961                        state);
962                 return -EIO;
963         }
964 
965         if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY))
966                 return -ENOMEM;
967 
968         atomic_set(&data.working, 0);
969         atomic_set(&data.done, 0);
970         atomic_set(&data.error, 0);
971         data.token = rtas_token("ibm,suspend-me");
972         data.complete = &done;
973 
974         /* All present CPUs must be online */
975         cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
976         cpuret = rtas_online_cpus_mask(offline_mask);
977         if (cpuret) {
978                 pr_err("%s: Could not bring present CPUs online.\n", __func__);
979                 atomic_set(&data.error, cpuret);
980                 goto out;
981         }
982 
983         stop_topology_update();
984 
985         /* Call function on all CPUs.  One of us will make the
986          * rtas call
987          */
988         if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
989                 atomic_set(&data.error, -EINVAL);
990 
991         wait_for_completion(&done);
992 
993         if (atomic_read(&data.error) != 0)
994                 printk(KERN_ERR "Error doing global join\n");
995 
996         start_topology_update();
997 
998         /* Take down CPUs not online prior to suspend */
999         cpuret = rtas_offline_cpus_mask(offline_mask);
1000         if (cpuret)
1001                 pr_warn("%s: Could not restore CPUs to offline state.\n",
1002                                 __func__);
1003 
1004 out:
1005         free_cpumask_var(offline_mask);
1006         return atomic_read(&data.error);
1007 }
1008 #else /* CONFIG_PPC_PSERIES */
1009 int rtas_ibm_suspend_me(u64 handle)
1010 {
1011         return -ENOSYS;
1012 }
1013 #endif
1014 
1015 /**
1016  * Find a specific pseries error log in an RTAS extended event log.
1017  * @log: RTAS error/event log
1018  * @section_id: two character section identifier
1019  *
1020  * Returns a pointer to the specified errorlog or NULL if not found.
1021  */
1022 struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
1023                                               uint16_t section_id)
1024 {
1025         struct rtas_ext_event_log_v6 *ext_log =
1026                 (struct rtas_ext_event_log_v6 *)log->buffer;
1027         struct pseries_errorlog *sect;
1028         unsigned char *p, *log_end;
1029         uint32_t ext_log_length = rtas_error_extended_log_length(log);
1030         uint8_t log_format = rtas_ext_event_log_format(ext_log);
1031         uint32_t company_id = rtas_ext_event_company_id(ext_log);
1032 
1033         /* Check that we understand the format */
1034         if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
1035             log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
1036             company_id != RTAS_V6EXT_COMPANY_ID_IBM)
1037                 return NULL;
1038 
1039         log_end = log->buffer + ext_log_length;
1040         p = ext_log->vendor_log;
1041 
1042         while (p < log_end) {
1043                 sect = (struct pseries_errorlog *)p;
1044                 if (pseries_errorlog_id(sect) == section_id)
1045                         return sect;
1046                 p += pseries_errorlog_length(sect);
1047         }
1048 
1049         return NULL;
1050 }
1051 
1052 /* We assume to be passed big endian arguments */
1053 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
1054 {
1055         struct rtas_args args;
1056         unsigned long flags;
1057         char *buff_copy, *errbuf = NULL;
1058         int nargs, nret, token;
1059 
1060         if (!capable(CAP_SYS_ADMIN))
1061                 return -EPERM;
1062 
1063         if (!rtas.entry)
1064                 return -EINVAL;
1065 
1066         if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1067                 return -EFAULT;
1068 
1069         nargs = be32_to_cpu(args.nargs);
1070         nret  = be32_to_cpu(args.nret);
1071         token = be32_to_cpu(args.token);
1072 
1073         if (nargs >= ARRAY_SIZE(args.args)
1074             || nret > ARRAY_SIZE(args.args)
1075             || nargs + nret > ARRAY_SIZE(args.args))
1076                 return -EINVAL;
1077 
1078         /* Copy in args. */
1079         if (copy_from_user(args.args, uargs->args,
1080                            nargs * sizeof(rtas_arg_t)) != 0)
1081                 return -EFAULT;
1082 
1083         if (token == RTAS_UNKNOWN_SERVICE)
1084                 return -EINVAL;
1085 
1086         args.rets = &args.args[nargs];
1087         memset(args.rets, 0, nret * sizeof(rtas_arg_t));
1088 
1089         /* Need to handle ibm,suspend_me call specially */
1090         if (token == ibm_suspend_me_token) {
1091 
1092                 /*
1093                  * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1094                  * endian, or at least the hcall within it requires it.
1095                  */
1096                 int rc = 0;
1097                 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
1098                               | be32_to_cpu(args.args[1]);
1099                 rc = rtas_ibm_suspend_me(handle);
1100                 if (rc == -EAGAIN)
1101                         args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
1102                 else if (rc == -EIO)
1103                         args.rets[0] = cpu_to_be32(-1);
1104                 else if (rc)
1105                         return rc;
1106                 goto copy_return;
1107         }
1108 
1109         buff_copy = get_errorlog_buffer();
1110 
1111         flags = lock_rtas();
1112 
1113         rtas.args = args;
1114         enter_rtas(__pa(&rtas.args));
1115         args = rtas.args;
1116 
1117         /* A -1 return code indicates that the last command couldn't
1118            be completed due to a hardware error. */
1119         if (be32_to_cpu(args.rets[0]) == -1)
1120                 errbuf = __fetch_rtas_last_error(buff_copy);
1121 
1122         unlock_rtas(flags);
1123 
1124         if (buff_copy) {
1125                 if (errbuf)
1126                         log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1127                 kfree(buff_copy);
1128         }
1129 
1130  copy_return:
1131         /* Copy out args. */
1132         if (copy_to_user(uargs->args + nargs,
1133                          args.args + nargs,
1134                          nret * sizeof(rtas_arg_t)) != 0)
1135                 return -EFAULT;
1136 
1137         return 0;
1138 }
1139 
1140 /*
1141  * Call early during boot, before mem init, to retrieve the RTAS
1142  * information from the device-tree and allocate the RMO buffer for userland
1143  * accesses.
1144  */
1145 void __init rtas_initialize(void)
1146 {
1147         unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1148 
1149         /* Get RTAS dev node and fill up our "rtas" structure with infos
1150          * about it.
1151          */
1152         rtas.dev = of_find_node_by_name(NULL, "rtas");
1153         if (rtas.dev) {
1154                 const __be32 *basep, *entryp, *sizep;
1155 
1156                 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
1157                 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
1158                 if (basep != NULL && sizep != NULL) {
1159                         rtas.base = __be32_to_cpu(*basep);
1160                         rtas.size = __be32_to_cpu(*sizep);
1161                         entryp = of_get_property(rtas.dev,
1162                                         "linux,rtas-entry", NULL);
1163                         if (entryp == NULL) /* Ugh */
1164                                 rtas.entry = rtas.base;
1165                         else
1166                                 rtas.entry = __be32_to_cpu(*entryp);
1167                 } else
1168                         rtas.dev = NULL;
1169         }
1170         if (!rtas.dev)
1171                 return;
1172 
1173         /* If RTAS was found, allocate the RMO buffer for it and look for
1174          * the stop-self token if any
1175          */
1176 #ifdef CONFIG_PPC64
1177         if (firmware_has_feature(FW_FEATURE_LPAR)) {
1178                 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1179                 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
1180         }
1181 #endif
1182         rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
1183 
1184 #ifdef CONFIG_RTAS_ERROR_LOGGING
1185         rtas_last_error_token = rtas_token("rtas-last-error");
1186 #endif
1187 }
1188 
1189 int __init early_init_dt_scan_rtas(unsigned long node,
1190                 const char *uname, int depth, void *data)
1191 {
1192         const u32 *basep, *entryp, *sizep;
1193 
1194         if (depth != 1 || strcmp(uname, "rtas") != 0)
1195                 return 0;
1196 
1197         basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1198         entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1199         sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);
1200 
1201         if (basep && entryp && sizep) {
1202                 rtas.base = *basep;
1203                 rtas.entry = *entryp;
1204                 rtas.size = *sizep;
1205         }
1206 
1207 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1208         basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1209         if (basep)
1210                 rtas_putchar_token = *basep;
1211 
1212         basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1213         if (basep)
1214                 rtas_getchar_token = *basep;
1215 
1216         if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1217             rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1218                 udbg_init_rtas_console();
1219 
1220 #endif
1221 
1222         /* break now */
1223         return 1;
1224 }
1225 
1226 static arch_spinlock_t timebase_lock;
1227 static u64 timebase = 0;
1228 
1229 void rtas_give_timebase(void)
1230 {
1231         unsigned long flags;
1232 
1233         local_irq_save(flags);
1234         hard_irq_disable();
1235         arch_spin_lock(&timebase_lock);
1236         rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1237         timebase = get_tb();
1238         arch_spin_unlock(&timebase_lock);
1239 
1240         while (timebase)
1241                 barrier();
1242         rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1243         local_irq_restore(flags);
1244 }
1245 
1246 void rtas_take_timebase(void)
1247 {
1248         while (!timebase)
1249                 barrier();
1250         arch_spin_lock(&timebase_lock);
1251         set_tb(timebase >> 32, timebase & 0xffffffff);
1252         timebase = 0;
1253         arch_spin_unlock(&timebase_lock);
1254 }
1255 

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