Commit | Line | Data |
---|---|---|
1da177e4 LT |
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/module.h> | |
19 | #include <linux/init.h> | |
a9415644 | 20 | #include <linux/capability.h> |
21fe3301 | 21 | #include <linux/delay.h> |
1da177e4 LT |
22 | |
23 | #include <asm/prom.h> | |
24 | #include <asm/rtas.h> | |
31a7f67e | 25 | #include <asm/hvcall.h> |
1da177e4 LT |
26 | #include <asm/semaphore.h> |
27 | #include <asm/machdep.h> | |
28 | #include <asm/page.h> | |
29 | #include <asm/param.h> | |
30 | #include <asm/system.h> | |
1da177e4 LT |
31 | #include <asm/delay.h> |
32 | #include <asm/uaccess.h> | |
033ef338 | 33 | #include <asm/lmb.h> |
296167ae | 34 | #include <asm/udbg.h> |
a7f31841 | 35 | #include <asm/syscalls.h> |
1da177e4 | 36 | |
033ef338 | 37 | struct rtas_t rtas = { |
1da177e4 LT |
38 | .lock = SPIN_LOCK_UNLOCKED |
39 | }; | |
40 | ||
91dc182c DB |
41 | struct rtas_suspend_me_data { |
42 | long waiting; | |
43 | struct rtas_args *args; | |
44 | }; | |
45 | ||
1da177e4 LT |
46 | EXPORT_SYMBOL(rtas); |
47 | ||
1da177e4 | 48 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
033ef338 | 49 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
1da177e4 LT |
50 | unsigned long rtas_rmo_buf; |
51 | ||
f4fcbbe9 PM |
52 | /* |
53 | * If non-NULL, this gets called when the kernel terminates. | |
54 | * This is done like this so rtas_flash can be a module. | |
55 | */ | |
56 | void (*rtas_flash_term_hook)(int); | |
57 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
58 | ||
033ef338 PM |
59 | /* |
60 | * call_rtas_display_status and call_rtas_display_status_delay | |
61 | * are designed only for very early low-level debugging, which | |
62 | * is why the token is hard-coded to 10. | |
63 | */ | |
296167ae | 64 | static void call_rtas_display_status(char c) |
1da177e4 LT |
65 | { |
66 | struct rtas_args *args = &rtas.args; | |
67 | unsigned long s; | |
68 | ||
69 | if (!rtas.base) | |
70 | return; | |
71 | spin_lock_irqsave(&rtas.lock, s); | |
72 | ||
73 | args->token = 10; | |
74 | args->nargs = 1; | |
75 | args->nret = 1; | |
76 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 77 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
78 | |
79 | enter_rtas(__pa(args)); | |
80 | ||
81 | spin_unlock_irqrestore(&rtas.lock, s); | |
82 | } | |
83 | ||
296167ae | 84 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
85 | { |
86 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
87 | static int width = 16; | |
88 | ||
89 | if (c == '\n') { | |
90 | while (width-- > 0) | |
91 | call_rtas_display_status(' '); | |
92 | width = 16; | |
21fe3301 | 93 | mdelay(500); |
1da177e4 LT |
94 | pending_newline = 1; |
95 | } else { | |
96 | if (pending_newline) { | |
97 | call_rtas_display_status('\r'); | |
98 | call_rtas_display_status('\n'); | |
99 | } | |
100 | pending_newline = 0; | |
101 | if (width--) { | |
102 | call_rtas_display_status(c); | |
103 | udelay(10000); | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
296167ae ME |
108 | void __init udbg_init_rtas(void) |
109 | { | |
110 | udbg_putc = call_rtas_display_status_delay; | |
111 | } | |
112 | ||
033ef338 | 113 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
114 | { |
115 | struct device_node *root; | |
116 | int width, *p; | |
117 | char *os; | |
118 | static int display_character, set_indicator; | |
8f586b22 | 119 | static int display_width, display_lines, *row_width, form_feed; |
6566c6f1 | 120 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 121 | static int current_line; |
6566c6f1 AB |
122 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
123 | ||
124 | if (!rtas.base) | |
125 | return; | |
126 | ||
8f586b22 MS |
127 | if (display_width == 0) { |
128 | display_width = 0x10; | |
129 | if ((root = find_path_device("/rtas"))) { | |
130 | if ((p = (unsigned int *)get_property(root, | |
131 | "ibm,display-line-length", NULL))) | |
132 | display_width = *p; | |
133 | if ((p = (unsigned int *)get_property(root, | |
134 | "ibm,form-feed", NULL))) | |
135 | form_feed = *p; | |
136 | if ((p = (unsigned int *)get_property(root, | |
137 | "ibm,display-number-of-lines", NULL))) | |
138 | display_lines = *p; | |
139 | row_width = (unsigned int *)get_property(root, | |
140 | "ibm,display-truncation-length", NULL); | |
141 | } | |
6566c6f1 AB |
142 | display_character = rtas_token("display-character"); |
143 | set_indicator = rtas_token("set-indicator"); | |
144 | } | |
145 | ||
146 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
147 | /* use hex display if available */ | |
148 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
149 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
150 | return; | |
151 | } | |
152 | ||
153 | spin_lock(&progress_lock); | |
154 | ||
155 | /* | |
156 | * Last write ended with newline, but we didn't print it since | |
157 | * it would just clear the bottom line of output. Print it now | |
158 | * instead. | |
159 | * | |
8f586b22 MS |
160 | * If no newline is pending and form feed is supported, clear the |
161 | * display with a form feed; otherwise, print a CR to start output | |
162 | * at the beginning of the line. | |
6566c6f1 AB |
163 | */ |
164 | if (pending_newline) { | |
165 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
166 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
167 | pending_newline = 0; | |
168 | } else { | |
8f586b22 MS |
169 | current_line = 0; |
170 | if (form_feed) | |
171 | rtas_call(display_character, 1, 1, NULL, | |
172 | (char)form_feed); | |
173 | else | |
174 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
175 | } |
176 | ||
8f586b22 MS |
177 | if (row_width) |
178 | width = row_width[current_line]; | |
179 | else | |
180 | width = display_width; | |
6566c6f1 AB |
181 | os = s; |
182 | while (*os) { | |
183 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
184 | /* If newline is the last character, save it |
185 | * until next call to avoid bumping up the | |
186 | * display output. | |
187 | */ | |
188 | if (*os == '\n' && !os[1]) { | |
189 | pending_newline = 1; | |
8f586b22 MS |
190 | current_line++; |
191 | if (current_line > display_lines-1) | |
192 | current_line = display_lines-1; | |
6566c6f1 AB |
193 | spin_unlock(&progress_lock); |
194 | return; | |
195 | } | |
196 | ||
197 | /* RTAS wants CR-LF, not just LF */ | |
198 | ||
199 | if (*os == '\n') { | |
200 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
201 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
202 | } else { | |
203 | /* CR might be used to re-draw a line, so we'll | |
204 | * leave it alone and not add LF. | |
205 | */ | |
206 | rtas_call(display_character, 1, 1, NULL, *os); | |
207 | } | |
208 | ||
8f586b22 MS |
209 | if (row_width) |
210 | width = row_width[current_line]; | |
211 | else | |
212 | width = display_width; | |
6566c6f1 AB |
213 | } else { |
214 | width--; | |
215 | rtas_call(display_character, 1, 1, NULL, *os); | |
216 | } | |
217 | ||
218 | os++; | |
219 | ||
220 | /* if we overwrite the screen length */ | |
221 | if (width <= 0) | |
222 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
223 | os++; | |
224 | } | |
225 | ||
6566c6f1 AB |
226 | spin_unlock(&progress_lock); |
227 | } | |
f4fcbbe9 | 228 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 229 | |
033ef338 | 230 | int rtas_token(const char *service) |
1da177e4 LT |
231 | { |
232 | int *tokp; | |
033ef338 | 233 | if (rtas.dev == NULL) |
1da177e4 | 234 | return RTAS_UNKNOWN_SERVICE; |
1da177e4 LT |
235 | tokp = (int *) get_property(rtas.dev, service, NULL); |
236 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; | |
237 | } | |
238 | ||
033ef338 | 239 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
240 | /* |
241 | * Return the firmware-specified size of the error log buffer | |
242 | * for all rtas calls that require an error buffer argument. | |
243 | * This includes 'check-exception' and 'rtas-last-error'. | |
244 | */ | |
245 | int rtas_get_error_log_max(void) | |
246 | { | |
247 | static int rtas_error_log_max; | |
248 | if (rtas_error_log_max) | |
249 | return rtas_error_log_max; | |
250 | ||
251 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
252 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
253 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
254 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
255 | rtas_error_log_max); | |
1da177e4 LT |
256 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
257 | } | |
258 | return rtas_error_log_max; | |
259 | } | |
033ef338 | 260 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
261 | |
262 | ||
033ef338 PM |
263 | char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
264 | int rtas_last_error_token; | |
265 | ||
1da177e4 LT |
266 | /** Return a copy of the detailed error text associated with the |
267 | * most recent failed call to rtas. Because the error text | |
268 | * might go stale if there are any other intervening rtas calls, | |
269 | * this routine must be called atomically with whatever produced | |
270 | * the error (i.e. with rtas.lock still held from the previous call). | |
271 | */ | |
033ef338 | 272 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
273 | { |
274 | struct rtas_args err_args, save_args; | |
275 | u32 bufsz; | |
033ef338 PM |
276 | char *buf = NULL; |
277 | ||
278 | if (rtas_last_error_token == -1) | |
279 | return NULL; | |
1da177e4 LT |
280 | |
281 | bufsz = rtas_get_error_log_max(); | |
282 | ||
033ef338 | 283 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
284 | err_args.nargs = 2; |
285 | err_args.nret = 1; | |
1da177e4 LT |
286 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
287 | err_args.args[1] = bufsz; | |
288 | err_args.args[2] = 0; | |
289 | ||
290 | save_args = rtas.args; | |
291 | rtas.args = err_args; | |
292 | ||
293 | enter_rtas(__pa(&rtas.args)); | |
294 | ||
295 | err_args = rtas.args; | |
296 | rtas.args = save_args; | |
297 | ||
033ef338 PM |
298 | /* Log the error in the unlikely case that there was one. */ |
299 | if (unlikely(err_args.args[2] == 0)) { | |
300 | if (altbuf) { | |
301 | buf = altbuf; | |
302 | } else { | |
303 | buf = rtas_err_buf; | |
304 | if (mem_init_done) | |
305 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
306 | } | |
307 | if (buf) | |
308 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
309 | } | |
310 | ||
311 | return buf; | |
1da177e4 LT |
312 | } |
313 | ||
033ef338 PM |
314 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
315 | ||
316 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
317 | #define __fetch_rtas_last_error(x) NULL | |
318 | #define get_errorlog_buffer() NULL | |
319 | #endif | |
320 | ||
1da177e4 LT |
321 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
322 | { | |
323 | va_list list; | |
033ef338 | 324 | int i; |
1da177e4 LT |
325 | unsigned long s; |
326 | struct rtas_args *rtas_args; | |
033ef338 | 327 | char *buff_copy = NULL; |
1da177e4 LT |
328 | int ret; |
329 | ||
1da177e4 LT |
330 | if (token == RTAS_UNKNOWN_SERVICE) |
331 | return -1; | |
332 | ||
333 | /* Gotta do something different here, use global lock for now... */ | |
334 | spin_lock_irqsave(&rtas.lock, s); | |
335 | rtas_args = &rtas.args; | |
336 | ||
337 | rtas_args->token = token; | |
338 | rtas_args->nargs = nargs; | |
339 | rtas_args->nret = nret; | |
340 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
341 | va_start(list, outputs); | |
033ef338 | 342 | for (i = 0; i < nargs; ++i) |
1da177e4 | 343 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
344 | va_end(list); |
345 | ||
346 | for (i = 0; i < nret; ++i) | |
347 | rtas_args->rets[i] = 0; | |
348 | ||
1da177e4 | 349 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
350 | |
351 | /* A -1 return code indicates that the last command couldn't | |
352 | be completed due to a hardware error. */ | |
353 | if (rtas_args->rets[0] == -1) | |
033ef338 | 354 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
355 | |
356 | if (nret > 1 && outputs != NULL) | |
357 | for (i = 0; i < nret-1; ++i) | |
358 | outputs[i] = rtas_args->rets[i+1]; | |
359 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
360 | ||
1da177e4 LT |
361 | /* Gotta do something different here, use global lock for now... */ |
362 | spin_unlock_irqrestore(&rtas.lock, s); | |
363 | ||
364 | if (buff_copy) { | |
365 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
366 | if (mem_init_done) | |
367 | kfree(buff_copy); | |
368 | } | |
369 | return ret; | |
370 | } | |
371 | ||
372 | /* Given an RTAS status code of 990n compute the hinted delay of 10^n | |
373 | * (last digit) milliseconds. For now we bound at n=5 (100 sec). | |
374 | */ | |
033ef338 | 375 | unsigned int rtas_extended_busy_delay_time(int status) |
1da177e4 LT |
376 | { |
377 | int order = status - 9900; | |
378 | unsigned long ms; | |
379 | ||
380 | if (order < 0) | |
381 | order = 0; /* RTC depends on this for -2 clock busy */ | |
382 | else if (order > 5) | |
383 | order = 5; /* bound */ | |
384 | ||
385 | /* Use microseconds for reasonable accuracy */ | |
033ef338 | 386 | for (ms = 1; order > 0; order--) |
1da177e4 LT |
387 | ms *= 10; |
388 | ||
389 | return ms; | |
390 | } | |
391 | ||
392 | int rtas_error_rc(int rtas_rc) | |
393 | { | |
394 | int rc; | |
395 | ||
396 | switch (rtas_rc) { | |
397 | case -1: /* Hardware Error */ | |
398 | rc = -EIO; | |
399 | break; | |
400 | case -3: /* Bad indicator/domain/etc */ | |
401 | rc = -EINVAL; | |
402 | break; | |
403 | case -9000: /* Isolation error */ | |
404 | rc = -EFAULT; | |
405 | break; | |
406 | case -9001: /* Outstanding TCE/PTE */ | |
407 | rc = -EEXIST; | |
408 | break; | |
409 | case -9002: /* No usable slot */ | |
410 | rc = -ENODEV; | |
411 | break; | |
412 | default: | |
413 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
414 | __FUNCTION__, rtas_rc); | |
415 | rc = -ERANGE; | |
416 | break; | |
417 | } | |
418 | return rc; | |
419 | } | |
420 | ||
421 | int rtas_get_power_level(int powerdomain, int *level) | |
422 | { | |
423 | int token = rtas_token("get-power-level"); | |
424 | int rc; | |
425 | ||
426 | if (token == RTAS_UNKNOWN_SERVICE) | |
427 | return -ENOENT; | |
428 | ||
429 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
430 | udelay(1); | |
431 | ||
432 | if (rc < 0) | |
433 | return rtas_error_rc(rc); | |
434 | return rc; | |
435 | } | |
436 | ||
437 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
438 | { | |
439 | int token = rtas_token("set-power-level"); | |
440 | unsigned int wait_time; | |
441 | int rc; | |
442 | ||
443 | if (token == RTAS_UNKNOWN_SERVICE) | |
444 | return -ENOENT; | |
445 | ||
446 | while (1) { | |
447 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); | |
448 | if (rc == RTAS_BUSY) | |
449 | udelay(1); | |
450 | else if (rtas_is_extended_busy(rc)) { | |
451 | wait_time = rtas_extended_busy_delay_time(rc); | |
452 | udelay(wait_time * 1000); | |
453 | } else | |
454 | break; | |
455 | } | |
456 | ||
457 | if (rc < 0) | |
458 | return rtas_error_rc(rc); | |
459 | return rc; | |
460 | } | |
461 | ||
462 | int rtas_get_sensor(int sensor, int index, int *state) | |
463 | { | |
464 | int token = rtas_token("get-sensor-state"); | |
465 | unsigned int wait_time; | |
466 | int rc; | |
467 | ||
468 | if (token == RTAS_UNKNOWN_SERVICE) | |
469 | return -ENOENT; | |
470 | ||
471 | while (1) { | |
472 | rc = rtas_call(token, 2, 2, state, sensor, index); | |
473 | if (rc == RTAS_BUSY) | |
474 | udelay(1); | |
475 | else if (rtas_is_extended_busy(rc)) { | |
476 | wait_time = rtas_extended_busy_delay_time(rc); | |
477 | udelay(wait_time * 1000); | |
478 | } else | |
479 | break; | |
480 | } | |
481 | ||
482 | if (rc < 0) | |
483 | return rtas_error_rc(rc); | |
484 | return rc; | |
485 | } | |
486 | ||
487 | int rtas_set_indicator(int indicator, int index, int new_value) | |
488 | { | |
489 | int token = rtas_token("set-indicator"); | |
490 | unsigned int wait_time; | |
491 | int rc; | |
492 | ||
493 | if (token == RTAS_UNKNOWN_SERVICE) | |
494 | return -ENOENT; | |
495 | ||
496 | while (1) { | |
497 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
498 | if (rc == RTAS_BUSY) | |
499 | udelay(1); | |
500 | else if (rtas_is_extended_busy(rc)) { | |
501 | wait_time = rtas_extended_busy_delay_time(rc); | |
502 | udelay(wait_time * 1000); | |
503 | } | |
504 | else | |
505 | break; | |
506 | } | |
507 | ||
508 | if (rc < 0) | |
509 | return rtas_error_rc(rc); | |
510 | return rc; | |
511 | } | |
512 | ||
033ef338 | 513 | void rtas_restart(char *cmd) |
1da177e4 | 514 | { |
f4fcbbe9 PM |
515 | if (rtas_flash_term_hook) |
516 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
517 | printk("RTAS system-reboot returned %d\n", |
518 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
519 | for (;;); | |
520 | } | |
521 | ||
033ef338 | 522 | void rtas_power_off(void) |
1da177e4 | 523 | { |
f4fcbbe9 PM |
524 | if (rtas_flash_term_hook) |
525 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
526 | /* allow power on only with power button press */ |
527 | printk("RTAS power-off returned %d\n", | |
528 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
529 | for (;;); | |
530 | } | |
531 | ||
033ef338 | 532 | void rtas_halt(void) |
1da177e4 | 533 | { |
f4fcbbe9 PM |
534 | if (rtas_flash_term_hook) |
535 | rtas_flash_term_hook(SYS_HALT); | |
536 | /* allow power on only with power button press */ | |
537 | printk("RTAS power-off returned %d\n", | |
538 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
539 | for (;;); | |
1da177e4 LT |
540 | } |
541 | ||
542 | /* Must be in the RMO region, so we place it here */ | |
543 | static char rtas_os_term_buf[2048]; | |
544 | ||
545 | void rtas_os_term(char *str) | |
546 | { | |
547 | int status; | |
548 | ||
549 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) | |
550 | return; | |
551 | ||
552 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); | |
553 | ||
554 | do { | |
555 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
556 | __pa(rtas_os_term_buf)); | |
557 | ||
558 | if (status == RTAS_BUSY) | |
559 | udelay(1); | |
560 | else if (status != 0) | |
561 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
562 | status); | |
563 | } while (status == RTAS_BUSY); | |
564 | } | |
565 | ||
91dc182c DB |
566 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
567 | #ifdef CONFIG_PPC_PSERIES | |
568 | static void rtas_percpu_suspend_me(void *info) | |
569 | { | |
82a4df74 | 570 | int i; |
91dc182c DB |
571 | long rc; |
572 | long flags; | |
573 | struct rtas_suspend_me_data *data = | |
574 | (struct rtas_suspend_me_data *)info; | |
575 | ||
576 | /* | |
577 | * We use "waiting" to indicate our state. As long | |
578 | * as it is >0, we are still trying to all join up. | |
579 | * If it goes to 0, we have successfully joined up and | |
580 | * one thread got H_Continue. If any error happens, | |
581 | * we set it to <0. | |
582 | */ | |
583 | local_irq_save(flags); | |
584 | do { | |
585 | rc = plpar_hcall_norets(H_JOIN); | |
586 | smp_rmb(); | |
587 | } while (rc == H_Success && data->waiting > 0); | |
588 | if (rc == H_Success) | |
589 | goto out; | |
590 | ||
591 | if (rc == H_Continue) { | |
592 | data->waiting = 0; | |
c4cb8ecc DB |
593 | data->args->args[data->args->nargs] = |
594 | rtas_call(ibm_suspend_me_token, 0, 1, NULL); | |
82a4df74 DB |
595 | for_each_cpu(i) |
596 | plpar_hcall_norets(H_PROD,i); | |
91dc182c DB |
597 | } else { |
598 | data->waiting = -EBUSY; | |
599 | printk(KERN_ERR "Error on H_Join hypervisor call\n"); | |
600 | } | |
601 | ||
602 | out: | |
91dc182c DB |
603 | local_irq_restore(flags); |
604 | return; | |
605 | } | |
606 | ||
607 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
608 | { | |
609 | int i; | |
610 | ||
611 | struct rtas_suspend_me_data data; | |
612 | ||
613 | data.waiting = 1; | |
614 | data.args = args; | |
615 | ||
616 | /* Call function on all CPUs. One of us will make the | |
617 | * rtas call | |
618 | */ | |
619 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0)) | |
620 | data.waiting = -EINVAL; | |
621 | ||
622 | if (data.waiting != 0) | |
623 | printk(KERN_ERR "Error doing global join\n"); | |
624 | ||
625 | /* Prod each CPU. This won't hurt, and will wake | |
626 | * anyone we successfully put to sleep with H_Join | |
627 | */ | |
628 | for_each_cpu(i) | |
629 | plpar_hcall_norets(H_PROD, i); | |
630 | ||
631 | return data.waiting; | |
632 | } | |
633 | #else /* CONFIG_PPC_PSERIES */ | |
634 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
635 | { | |
636 | return -ENOSYS; | |
637 | } | |
638 | #endif | |
1da177e4 LT |
639 | |
640 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
641 | { | |
642 | struct rtas_args args; | |
643 | unsigned long flags; | |
033ef338 | 644 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 645 | int nargs; |
91dc182c | 646 | int rc; |
1da177e4 LT |
647 | |
648 | if (!capable(CAP_SYS_ADMIN)) | |
649 | return -EPERM; | |
650 | ||
651 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
652 | return -EFAULT; | |
653 | ||
654 | nargs = args.nargs; | |
655 | if (nargs > ARRAY_SIZE(args.args) | |
656 | || args.nret > ARRAY_SIZE(args.args) | |
657 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
658 | return -EINVAL; | |
659 | ||
660 | /* Copy in args. */ | |
661 | if (copy_from_user(args.args, uargs->args, | |
662 | nargs * sizeof(rtas_arg_t)) != 0) | |
663 | return -EFAULT; | |
664 | ||
91dc182c DB |
665 | if (args.token == RTAS_UNKNOWN_SERVICE) |
666 | return -EINVAL; | |
667 | ||
668 | /* Need to handle ibm,suspend_me call specially */ | |
669 | if (args.token == ibm_suspend_me_token) { | |
670 | rc = rtas_ibm_suspend_me(&args); | |
671 | if (rc) | |
672 | return rc; | |
673 | goto copy_return; | |
674 | } | |
675 | ||
033ef338 | 676 | buff_copy = get_errorlog_buffer(); |
1da177e4 LT |
677 | |
678 | spin_lock_irqsave(&rtas.lock, flags); | |
679 | ||
680 | rtas.args = args; | |
681 | enter_rtas(__pa(&rtas.args)); | |
682 | args = rtas.args; | |
683 | ||
684 | args.rets = &args.args[nargs]; | |
685 | ||
686 | /* A -1 return code indicates that the last command couldn't | |
687 | be completed due to a hardware error. */ | |
033ef338 PM |
688 | if (args.rets[0] == -1) |
689 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 LT |
690 | |
691 | spin_unlock_irqrestore(&rtas.lock, flags); | |
692 | ||
693 | if (buff_copy) { | |
033ef338 PM |
694 | if (errbuf) |
695 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
696 | kfree(buff_copy); |
697 | } | |
698 | ||
91dc182c | 699 | copy_return: |
1da177e4 LT |
700 | /* Copy out args. */ |
701 | if (copy_to_user(uargs->args + nargs, | |
702 | args.args + nargs, | |
703 | args.nret * sizeof(rtas_arg_t)) != 0) | |
704 | return -EFAULT; | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
709 | /* This version can't take the spinlock, because it never returns */ | |
710 | ||
711 | struct rtas_args rtas_stop_self_args = { | |
712 | /* The token is initialized for real in setup_system() */ | |
713 | .token = RTAS_UNKNOWN_SERVICE, | |
714 | .nargs = 0, | |
715 | .nret = 1, | |
716 | .rets = &rtas_stop_self_args.args[0], | |
717 | }; | |
718 | ||
719 | void rtas_stop_self(void) | |
720 | { | |
721 | struct rtas_args *rtas_args = &rtas_stop_self_args; | |
722 | ||
723 | local_irq_disable(); | |
724 | ||
725 | BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE); | |
726 | ||
727 | printk("cpu %u (hwid %u) Ready to die...\n", | |
728 | smp_processor_id(), hard_smp_processor_id()); | |
729 | enter_rtas(__pa(rtas_args)); | |
730 | ||
731 | panic("Alas, I survived.\n"); | |
732 | } | |
733 | ||
734 | /* | |
943ffb58 | 735 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
736 | * informations from the device-tree and allocate the RMO buffer for userland |
737 | * accesses. | |
738 | */ | |
739 | void __init rtas_initialize(void) | |
740 | { | |
033ef338 PM |
741 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
742 | ||
1da177e4 LT |
743 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
744 | * about it. | |
745 | */ | |
746 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
747 | if (rtas.dev) { | |
748 | u32 *basep, *entryp; | |
749 | u32 *sizep; | |
750 | ||
751 | basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL); | |
752 | sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL); | |
753 | if (basep != NULL && sizep != NULL) { | |
754 | rtas.base = *basep; | |
755 | rtas.size = *sizep; | |
756 | entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL); | |
757 | if (entryp == NULL) /* Ugh */ | |
758 | rtas.entry = rtas.base; | |
759 | else | |
760 | rtas.entry = *entryp; | |
761 | } else | |
762 | rtas.dev = NULL; | |
763 | } | |
033ef338 PM |
764 | if (!rtas.dev) |
765 | return; | |
766 | ||
1da177e4 LT |
767 | /* If RTAS was found, allocate the RMO buffer for it and look for |
768 | * the stop-self token if any | |
769 | */ | |
033ef338 | 770 | #ifdef CONFIG_PPC64 |
91dc182c | 771 | if (_machine == PLATFORM_PSERIES_LPAR) { |
033ef338 | 772 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
773 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
774 | } | |
033ef338 PM |
775 | #endif |
776 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); | |
1da177e4 LT |
777 | |
778 | #ifdef CONFIG_HOTPLUG_CPU | |
033ef338 | 779 | rtas_stop_self_args.token = rtas_token("stop-self"); |
1da177e4 | 780 | #endif /* CONFIG_HOTPLUG_CPU */ |
033ef338 PM |
781 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
782 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
783 | #endif | |
1da177e4 LT |
784 | } |
785 | ||
786 | ||
1da177e4 LT |
787 | EXPORT_SYMBOL(rtas_token); |
788 | EXPORT_SYMBOL(rtas_call); | |
789 | EXPORT_SYMBOL(rtas_data_buf); | |
790 | EXPORT_SYMBOL(rtas_data_buf_lock); | |
791 | EXPORT_SYMBOL(rtas_extended_busy_delay_time); | |
792 | EXPORT_SYMBOL(rtas_get_sensor); | |
793 | EXPORT_SYMBOL(rtas_get_power_level); | |
794 | EXPORT_SYMBOL(rtas_set_power_level); | |
795 | EXPORT_SYMBOL(rtas_set_indicator); |