Commit | Line | Data |
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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> |
8f5c7579 NL |
22 | #include <linux/smp.h> |
23 | #include <linux/completion.h> | |
24 | #include <linux/cpumask.h> | |
95f72d1e | 25 | #include <linux/memblock.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
c5f41752 | 27 | #include <linux/reboot.h> |
1da177e4 LT |
28 | |
29 | #include <asm/prom.h> | |
30 | #include <asm/rtas.h> | |
31a7f67e | 31 | #include <asm/hvcall.h> |
1da177e4 | 32 | #include <asm/machdep.h> |
e8222502 | 33 | #include <asm/firmware.h> |
1da177e4 LT |
34 | #include <asm/page.h> |
35 | #include <asm/param.h> | |
36 | #include <asm/system.h> | |
1da177e4 LT |
37 | #include <asm/delay.h> |
38 | #include <asm/uaccess.h> | |
296167ae | 39 | #include <asm/udbg.h> |
a7f31841 | 40 | #include <asm/syscalls.h> |
8f5c7579 | 41 | #include <asm/smp.h> |
60063497 | 42 | #include <linux/atomic.h> |
c4007a2f | 43 | #include <asm/time.h> |
46db2f86 | 44 | #include <asm/mmu.h> |
3b7a27db | 45 | #include <asm/topology.h> |
9ee820fa | 46 | #include <asm/pSeries_reconfig.h> |
1da177e4 | 47 | |
033ef338 | 48 | struct rtas_t rtas = { |
edc35bd7 | 49 | .lock = __ARCH_SPIN_LOCK_UNLOCKED |
1da177e4 | 50 | }; |
ab3ab74d | 51 | EXPORT_SYMBOL(rtas); |
1da177e4 | 52 | |
1da177e4 | 53 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
54 | EXPORT_SYMBOL(rtas_data_buf_lock); |
55 | ||
033ef338 | 56 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
57 | EXPORT_SYMBOL(rtas_data_buf); |
58 | ||
1da177e4 LT |
59 | unsigned long rtas_rmo_buf; |
60 | ||
f4fcbbe9 PM |
61 | /* |
62 | * If non-NULL, this gets called when the kernel terminates. | |
63 | * This is done like this so rtas_flash can be a module. | |
64 | */ | |
65 | void (*rtas_flash_term_hook)(int); | |
66 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
67 | ||
f97bb36f BH |
68 | /* RTAS use home made raw locking instead of spin_lock_irqsave |
69 | * because those can be called from within really nasty contexts | |
70 | * such as having the timebase stopped which would lockup with | |
71 | * normal locks and spinlock debugging enabled | |
72 | */ | |
73 | static unsigned long lock_rtas(void) | |
74 | { | |
75 | unsigned long flags; | |
76 | ||
77 | local_irq_save(flags); | |
78 | preempt_disable(); | |
0199c4e6 | 79 | arch_spin_lock_flags(&rtas.lock, flags); |
f97bb36f BH |
80 | return flags; |
81 | } | |
82 | ||
83 | static void unlock_rtas(unsigned long flags) | |
84 | { | |
0199c4e6 | 85 | arch_spin_unlock(&rtas.lock); |
f97bb36f BH |
86 | local_irq_restore(flags); |
87 | preempt_enable(); | |
88 | } | |
89 | ||
033ef338 PM |
90 | /* |
91 | * call_rtas_display_status and call_rtas_display_status_delay | |
92 | * are designed only for very early low-level debugging, which | |
93 | * is why the token is hard-coded to 10. | |
94 | */ | |
296167ae | 95 | static void call_rtas_display_status(char c) |
1da177e4 LT |
96 | { |
97 | struct rtas_args *args = &rtas.args; | |
98 | unsigned long s; | |
99 | ||
100 | if (!rtas.base) | |
101 | return; | |
f97bb36f | 102 | s = lock_rtas(); |
1da177e4 LT |
103 | |
104 | args->token = 10; | |
105 | args->nargs = 1; | |
106 | args->nret = 1; | |
107 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 108 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
109 | |
110 | enter_rtas(__pa(args)); | |
111 | ||
f97bb36f | 112 | unlock_rtas(s); |
1da177e4 LT |
113 | } |
114 | ||
296167ae | 115 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
116 | { |
117 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
118 | static int width = 16; | |
119 | ||
120 | if (c == '\n') { | |
121 | while (width-- > 0) | |
122 | call_rtas_display_status(' '); | |
123 | width = 16; | |
21fe3301 | 124 | mdelay(500); |
1da177e4 LT |
125 | pending_newline = 1; |
126 | } else { | |
127 | if (pending_newline) { | |
128 | call_rtas_display_status('\r'); | |
129 | call_rtas_display_status('\n'); | |
130 | } | |
131 | pending_newline = 0; | |
132 | if (width--) { | |
133 | call_rtas_display_status(c); | |
134 | udelay(10000); | |
135 | } | |
136 | } | |
137 | } | |
138 | ||
cc46bb98 | 139 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
140 | { |
141 | udbg_putc = call_rtas_display_status_delay; | |
142 | } | |
143 | ||
cc46bb98 ME |
144 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
145 | ||
146 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
147 | * work, you can hard code the token values for your firmware here and | |
148 | * hardcode rtas.base/entry etc. | |
149 | */ | |
150 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
151 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
152 | ||
153 | static void udbg_rtascon_putc(char c) | |
154 | { | |
155 | int tries; | |
156 | ||
157 | if (!rtas.base) | |
158 | return; | |
159 | ||
160 | /* Add CRs before LFs */ | |
161 | if (c == '\n') | |
162 | udbg_rtascon_putc('\r'); | |
163 | ||
164 | /* if there is more than one character to be displayed, wait a bit */ | |
165 | for (tries = 0; tries < 16; tries++) { | |
166 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
167 | break; | |
168 | udelay(1000); | |
169 | } | |
170 | } | |
171 | ||
172 | static int udbg_rtascon_getc_poll(void) | |
173 | { | |
174 | int c; | |
175 | ||
176 | if (!rtas.base) | |
177 | return -1; | |
178 | ||
179 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
180 | return -1; | |
181 | ||
182 | return c; | |
183 | } | |
184 | ||
185 | static int udbg_rtascon_getc(void) | |
186 | { | |
187 | int c; | |
188 | ||
189 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
190 | ; | |
191 | ||
192 | return c; | |
193 | } | |
194 | ||
195 | ||
196 | void __init udbg_init_rtas_console(void) | |
197 | { | |
198 | udbg_putc = udbg_rtascon_putc; | |
199 | udbg_getc = udbg_rtascon_getc; | |
200 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
201 | } | |
202 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
203 | ||
033ef338 | 204 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
205 | { |
206 | struct device_node *root; | |
a7f67bdf JK |
207 | int width; |
208 | const int *p; | |
6566c6f1 AB |
209 | char *os; |
210 | static int display_character, set_indicator; | |
a7f67bdf | 211 | static int display_width, display_lines, form_feed; |
c5a69d57 | 212 | static const int *row_width; |
6566c6f1 | 213 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 214 | static int current_line; |
6566c6f1 AB |
215 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
216 | ||
217 | if (!rtas.base) | |
218 | return; | |
219 | ||
8f586b22 MS |
220 | if (display_width == 0) { |
221 | display_width = 0x10; | |
8c8dc322 | 222 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 223 | if ((p = of_get_property(root, |
8f586b22 MS |
224 | "ibm,display-line-length", NULL))) |
225 | display_width = *p; | |
e2eb6392 | 226 | if ((p = of_get_property(root, |
8f586b22 MS |
227 | "ibm,form-feed", NULL))) |
228 | form_feed = *p; | |
e2eb6392 | 229 | if ((p = of_get_property(root, |
8f586b22 MS |
230 | "ibm,display-number-of-lines", NULL))) |
231 | display_lines = *p; | |
e2eb6392 | 232 | row_width = of_get_property(root, |
8f586b22 | 233 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 234 | of_node_put(root); |
8f586b22 | 235 | } |
6566c6f1 AB |
236 | display_character = rtas_token("display-character"); |
237 | set_indicator = rtas_token("set-indicator"); | |
238 | } | |
239 | ||
240 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
241 | /* use hex display if available */ | |
242 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
243 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
244 | return; | |
245 | } | |
246 | ||
247 | spin_lock(&progress_lock); | |
248 | ||
249 | /* | |
250 | * Last write ended with newline, but we didn't print it since | |
251 | * it would just clear the bottom line of output. Print it now | |
252 | * instead. | |
253 | * | |
8f586b22 MS |
254 | * If no newline is pending and form feed is supported, clear the |
255 | * display with a form feed; otherwise, print a CR to start output | |
256 | * at the beginning of the line. | |
6566c6f1 AB |
257 | */ |
258 | if (pending_newline) { | |
259 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
260 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
261 | pending_newline = 0; | |
262 | } else { | |
8f586b22 MS |
263 | current_line = 0; |
264 | if (form_feed) | |
265 | rtas_call(display_character, 1, 1, NULL, | |
266 | (char)form_feed); | |
267 | else | |
268 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
269 | } |
270 | ||
8f586b22 MS |
271 | if (row_width) |
272 | width = row_width[current_line]; | |
273 | else | |
274 | width = display_width; | |
6566c6f1 AB |
275 | os = s; |
276 | while (*os) { | |
277 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
278 | /* If newline is the last character, save it |
279 | * until next call to avoid bumping up the | |
280 | * display output. | |
281 | */ | |
282 | if (*os == '\n' && !os[1]) { | |
283 | pending_newline = 1; | |
8f586b22 MS |
284 | current_line++; |
285 | if (current_line > display_lines-1) | |
286 | current_line = display_lines-1; | |
6566c6f1 AB |
287 | spin_unlock(&progress_lock); |
288 | return; | |
289 | } | |
290 | ||
291 | /* RTAS wants CR-LF, not just LF */ | |
292 | ||
293 | if (*os == '\n') { | |
294 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
295 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
296 | } else { | |
297 | /* CR might be used to re-draw a line, so we'll | |
298 | * leave it alone and not add LF. | |
299 | */ | |
300 | rtas_call(display_character, 1, 1, NULL, *os); | |
301 | } | |
302 | ||
8f586b22 MS |
303 | if (row_width) |
304 | width = row_width[current_line]; | |
305 | else | |
306 | width = display_width; | |
6566c6f1 AB |
307 | } else { |
308 | width--; | |
309 | rtas_call(display_character, 1, 1, NULL, *os); | |
310 | } | |
311 | ||
312 | os++; | |
313 | ||
314 | /* if we overwrite the screen length */ | |
315 | if (width <= 0) | |
316 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
317 | os++; | |
318 | } | |
319 | ||
6566c6f1 AB |
320 | spin_unlock(&progress_lock); |
321 | } | |
f4fcbbe9 | 322 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 323 | |
033ef338 | 324 | int rtas_token(const char *service) |
1da177e4 | 325 | { |
a7f67bdf | 326 | const int *tokp; |
033ef338 | 327 | if (rtas.dev == NULL) |
1da177e4 | 328 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 329 | tokp = of_get_property(rtas.dev, service, NULL); |
1da177e4 LT |
330 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
331 | } | |
ab3ab74d | 332 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 333 | |
f2d6d2d8 NL |
334 | int rtas_service_present(const char *service) |
335 | { | |
336 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
337 | } | |
338 | EXPORT_SYMBOL(rtas_service_present); | |
339 | ||
033ef338 | 340 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
341 | /* |
342 | * Return the firmware-specified size of the error log buffer | |
343 | * for all rtas calls that require an error buffer argument. | |
344 | * This includes 'check-exception' and 'rtas-last-error'. | |
345 | */ | |
346 | int rtas_get_error_log_max(void) | |
347 | { | |
348 | static int rtas_error_log_max; | |
349 | if (rtas_error_log_max) | |
350 | return rtas_error_log_max; | |
351 | ||
352 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
353 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
354 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
355 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
356 | rtas_error_log_max); | |
1da177e4 LT |
357 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
358 | } | |
359 | return rtas_error_log_max; | |
360 | } | |
033ef338 | 361 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
362 | |
363 | ||
1c21a293 ME |
364 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
365 | static int rtas_last_error_token; | |
033ef338 | 366 | |
1da177e4 LT |
367 | /** Return a copy of the detailed error text associated with the |
368 | * most recent failed call to rtas. Because the error text | |
369 | * might go stale if there are any other intervening rtas calls, | |
370 | * this routine must be called atomically with whatever produced | |
371 | * the error (i.e. with rtas.lock still held from the previous call). | |
372 | */ | |
033ef338 | 373 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
374 | { |
375 | struct rtas_args err_args, save_args; | |
376 | u32 bufsz; | |
033ef338 PM |
377 | char *buf = NULL; |
378 | ||
379 | if (rtas_last_error_token == -1) | |
380 | return NULL; | |
1da177e4 LT |
381 | |
382 | bufsz = rtas_get_error_log_max(); | |
383 | ||
033ef338 | 384 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
385 | err_args.nargs = 2; |
386 | err_args.nret = 1; | |
1da177e4 LT |
387 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
388 | err_args.args[1] = bufsz; | |
389 | err_args.args[2] = 0; | |
390 | ||
391 | save_args = rtas.args; | |
392 | rtas.args = err_args; | |
393 | ||
394 | enter_rtas(__pa(&rtas.args)); | |
395 | ||
396 | err_args = rtas.args; | |
397 | rtas.args = save_args; | |
398 | ||
033ef338 PM |
399 | /* Log the error in the unlikely case that there was one. */ |
400 | if (unlikely(err_args.args[2] == 0)) { | |
401 | if (altbuf) { | |
402 | buf = altbuf; | |
403 | } else { | |
404 | buf = rtas_err_buf; | |
405 | if (mem_init_done) | |
406 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
407 | } | |
408 | if (buf) | |
409 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
410 | } | |
411 | ||
412 | return buf; | |
1da177e4 LT |
413 | } |
414 | ||
033ef338 PM |
415 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
416 | ||
417 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
418 | #define __fetch_rtas_last_error(x) NULL | |
419 | #define get_errorlog_buffer() NULL | |
420 | #endif | |
421 | ||
1da177e4 LT |
422 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
423 | { | |
424 | va_list list; | |
033ef338 | 425 | int i; |
1da177e4 LT |
426 | unsigned long s; |
427 | struct rtas_args *rtas_args; | |
033ef338 | 428 | char *buff_copy = NULL; |
1da177e4 LT |
429 | int ret; |
430 | ||
24da3dd5 | 431 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
432 | return -1; |
433 | ||
f97bb36f | 434 | s = lock_rtas(); |
1da177e4 LT |
435 | rtas_args = &rtas.args; |
436 | ||
437 | rtas_args->token = token; | |
438 | rtas_args->nargs = nargs; | |
439 | rtas_args->nret = nret; | |
440 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
441 | va_start(list, outputs); | |
033ef338 | 442 | for (i = 0; i < nargs; ++i) |
1da177e4 | 443 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
444 | va_end(list); |
445 | ||
446 | for (i = 0; i < nret; ++i) | |
447 | rtas_args->rets[i] = 0; | |
448 | ||
1da177e4 | 449 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
450 | |
451 | /* A -1 return code indicates that the last command couldn't | |
452 | be completed due to a hardware error. */ | |
453 | if (rtas_args->rets[0] == -1) | |
033ef338 | 454 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
455 | |
456 | if (nret > 1 && outputs != NULL) | |
457 | for (i = 0; i < nret-1; ++i) | |
458 | outputs[i] = rtas_args->rets[i+1]; | |
459 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
460 | ||
f97bb36f | 461 | unlock_rtas(s); |
1da177e4 LT |
462 | |
463 | if (buff_copy) { | |
464 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
465 | if (mem_init_done) | |
466 | kfree(buff_copy); | |
467 | } | |
468 | return ret; | |
469 | } | |
ab3ab74d | 470 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 471 | |
507279db JR |
472 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
473 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 474 | */ |
507279db | 475 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 476 | { |
507279db JR |
477 | int order; |
478 | unsigned int ms = 0; | |
479 | ||
480 | if (status == RTAS_BUSY) { | |
481 | ms = 1; | |
482 | } else if (status >= 9900 && status <= 9905) { | |
483 | order = status - 9900; | |
484 | for (ms = 1; order > 0; order--) | |
485 | ms *= 10; | |
486 | } | |
1da177e4 | 487 | |
507279db JR |
488 | return ms; |
489 | } | |
ab3ab74d | 490 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 491 | |
507279db JR |
492 | /* For an RTAS busy status code, perform the hinted delay. */ |
493 | unsigned int rtas_busy_delay(int status) | |
494 | { | |
495 | unsigned int ms; | |
1da177e4 | 496 | |
507279db JR |
497 | might_sleep(); |
498 | ms = rtas_busy_delay_time(status); | |
eca590f4 | 499 | if (ms && need_resched()) |
507279db JR |
500 | msleep(ms); |
501 | ||
502 | return ms; | |
1da177e4 | 503 | } |
ab3ab74d | 504 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 505 | |
1c21a293 | 506 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
507 | { |
508 | int rc; | |
509 | ||
510 | switch (rtas_rc) { | |
511 | case -1: /* Hardware Error */ | |
512 | rc = -EIO; | |
513 | break; | |
514 | case -3: /* Bad indicator/domain/etc */ | |
515 | rc = -EINVAL; | |
516 | break; | |
517 | case -9000: /* Isolation error */ | |
518 | rc = -EFAULT; | |
519 | break; | |
520 | case -9001: /* Outstanding TCE/PTE */ | |
521 | rc = -EEXIST; | |
522 | break; | |
523 | case -9002: /* No usable slot */ | |
524 | rc = -ENODEV; | |
525 | break; | |
526 | default: | |
527 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 528 | __func__, rtas_rc); |
1da177e4 LT |
529 | rc = -ERANGE; |
530 | break; | |
531 | } | |
532 | return rc; | |
533 | } | |
534 | ||
535 | int rtas_get_power_level(int powerdomain, int *level) | |
536 | { | |
537 | int token = rtas_token("get-power-level"); | |
538 | int rc; | |
539 | ||
540 | if (token == RTAS_UNKNOWN_SERVICE) | |
541 | return -ENOENT; | |
542 | ||
543 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
544 | udelay(1); | |
545 | ||
546 | if (rc < 0) | |
547 | return rtas_error_rc(rc); | |
548 | return rc; | |
549 | } | |
ab3ab74d | 550 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
551 | |
552 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
553 | { | |
554 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
555 | int rc; |
556 | ||
557 | if (token == RTAS_UNKNOWN_SERVICE) | |
558 | return -ENOENT; | |
559 | ||
507279db | 560 | do { |
1da177e4 | 561 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 562 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
563 | |
564 | if (rc < 0) | |
565 | return rtas_error_rc(rc); | |
566 | return rc; | |
567 | } | |
ab3ab74d | 568 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
569 | |
570 | int rtas_get_sensor(int sensor, int index, int *state) | |
571 | { | |
572 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
573 | int rc; |
574 | ||
575 | if (token == RTAS_UNKNOWN_SERVICE) | |
576 | return -ENOENT; | |
577 | ||
507279db | 578 | do { |
1da177e4 | 579 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 580 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
581 | |
582 | if (rc < 0) | |
583 | return rtas_error_rc(rc); | |
584 | return rc; | |
585 | } | |
ab3ab74d | 586 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 | 587 | |
edc72ac4 NL |
588 | bool rtas_indicator_present(int token, int *maxindex) |
589 | { | |
590 | int proplen, count, i; | |
591 | const struct indicator_elem { | |
592 | u32 token; | |
593 | u32 maxindex; | |
594 | } *indicators; | |
595 | ||
596 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); | |
597 | if (!indicators) | |
598 | return false; | |
599 | ||
600 | count = proplen / sizeof(struct indicator_elem); | |
601 | ||
602 | for (i = 0; i < count; i++) { | |
603 | if (indicators[i].token != token) | |
604 | continue; | |
605 | if (maxindex) | |
606 | *maxindex = indicators[i].maxindex; | |
607 | return true; | |
608 | } | |
609 | ||
610 | return false; | |
611 | } | |
612 | EXPORT_SYMBOL(rtas_indicator_present); | |
613 | ||
1da177e4 LT |
614 | int rtas_set_indicator(int indicator, int index, int new_value) |
615 | { | |
616 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
617 | int rc; |
618 | ||
619 | if (token == RTAS_UNKNOWN_SERVICE) | |
620 | return -ENOENT; | |
621 | ||
507279db | 622 | do { |
1da177e4 | 623 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 624 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
625 | |
626 | if (rc < 0) | |
627 | return rtas_error_rc(rc); | |
628 | return rc; | |
629 | } | |
ab3ab74d | 630 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 631 | |
81b73dd9 HM |
632 | /* |
633 | * Ignoring RTAS extended delay | |
634 | */ | |
635 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
636 | { | |
637 | int rc; | |
638 | int token = rtas_token("set-indicator"); | |
639 | ||
640 | if (token == RTAS_UNKNOWN_SERVICE) | |
641 | return -ENOENT; | |
642 | ||
643 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
644 | ||
645 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); | |
646 | ||
647 | if (rc < 0) | |
648 | return rtas_error_rc(rc); | |
649 | ||
650 | return rc; | |
651 | } | |
652 | ||
033ef338 | 653 | void rtas_restart(char *cmd) |
1da177e4 | 654 | { |
f4fcbbe9 PM |
655 | if (rtas_flash_term_hook) |
656 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
657 | printk("RTAS system-reboot returned %d\n", |
658 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
659 | for (;;); | |
660 | } | |
661 | ||
033ef338 | 662 | void rtas_power_off(void) |
1da177e4 | 663 | { |
f4fcbbe9 PM |
664 | if (rtas_flash_term_hook) |
665 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
666 | /* allow power on only with power button press */ |
667 | printk("RTAS power-off returned %d\n", | |
668 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
669 | for (;;); | |
670 | } | |
671 | ||
033ef338 | 672 | void rtas_halt(void) |
1da177e4 | 673 | { |
f4fcbbe9 PM |
674 | if (rtas_flash_term_hook) |
675 | rtas_flash_term_hook(SYS_HALT); | |
676 | /* allow power on only with power button press */ | |
677 | printk("RTAS power-off returned %d\n", | |
678 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
679 | for (;;); | |
1da177e4 LT |
680 | } |
681 | ||
682 | /* Must be in the RMO region, so we place it here */ | |
683 | static char rtas_os_term_buf[2048]; | |
684 | ||
8f515061 | 685 | void rtas_os_term(char *str) |
a2b51812 LV |
686 | { |
687 | int status; | |
39ed2fe6 | 688 | |
e9bbc8cd AB |
689 | /* |
690 | * Firmware with the ibm,extended-os-term property is guaranteed | |
691 | * to always return from an ibm,os-term call. Earlier versions without | |
692 | * this property may terminate the partition which we want to avoid | |
693 | * since it interferes with panic_timeout. | |
694 | */ | |
695 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || | |
696 | RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) | |
1da177e4 LT |
697 | return; |
698 | ||
8f515061 PM |
699 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
700 | ||
1da177e4 LT |
701 | do { |
702 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
703 | __pa(rtas_os_term_buf)); | |
507279db | 704 | } while (rtas_busy_delay(status)); |
1da177e4 | 705 | |
507279db | 706 | if (status != 0) |
e9bbc8cd | 707 | printk(KERN_EMERG "ibm,os-term call failed %d\n", status); |
1da177e4 LT |
708 | } |
709 | ||
91dc182c DB |
710 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
711 | #ifdef CONFIG_PPC_PSERIES | |
8fe93f8d BK |
712 | static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
713 | { | |
714 | u16 slb_size = mmu_slb_size; | |
715 | int rc = H_MULTI_THREADS_ACTIVE; | |
716 | int cpu; | |
717 | ||
718 | slb_set_size(SLB_MIN_SIZE); | |
3b7a27db | 719 | stop_topology_update(); |
8fe93f8d BK |
720 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); |
721 | ||
722 | while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && | |
723 | !atomic_read(&data->error)) | |
724 | rc = rtas_call(data->token, 0, 1, NULL); | |
725 | ||
726 | if (rc || atomic_read(&data->error)) { | |
727 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); | |
728 | slb_set_size(slb_size); | |
729 | } | |
730 | ||
731 | if (atomic_read(&data->error)) | |
732 | rc = atomic_read(&data->error); | |
733 | ||
734 | atomic_set(&data->error, rc); | |
3b7a27db | 735 | start_topology_update(); |
9ee820fa | 736 | pSeries_coalesce_init(); |
8fe93f8d BK |
737 | |
738 | if (wake_when_done) { | |
739 | atomic_set(&data->done, 1); | |
740 | ||
741 | for_each_online_cpu(cpu) | |
742 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
743 | } | |
744 | ||
745 | if (atomic_dec_return(&data->working) == 0) | |
746 | complete(data->complete); | |
747 | ||
748 | return rc; | |
749 | } | |
750 | ||
751 | int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) | |
752 | { | |
753 | atomic_inc(&data->working); | |
754 | return __rtas_suspend_last_cpu(data, 0); | |
755 | } | |
756 | ||
757 | static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) | |
91dc182c | 758 | { |
f52862f4 | 759 | long rc = H_SUCCESS; |
8f5c7579 NL |
760 | unsigned long msr_save; |
761 | int cpu; | |
91dc182c | 762 | |
8f5c7579 NL |
763 | atomic_inc(&data->working); |
764 | ||
765 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
766 | msr_save = mfmsr(); | |
767 | mtmsr(msr_save & ~(MSR_EE)); | |
768 | ||
8fe93f8d | 769 | while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) |
f52862f4 | 770 | rc = plpar_hcall_norets(H_JOIN); |
8f5c7579 NL |
771 | |
772 | mtmsr(msr_save); | |
91dc182c | 773 | |
8f5c7579 NL |
774 | if (rc == H_SUCCESS) { |
775 | /* This cpu was prodded and the suspend is complete. */ | |
776 | goto out; | |
777 | } else if (rc == H_CONTINUE) { | |
778 | /* All other cpus are in H_JOIN, this cpu does | |
779 | * the suspend. | |
780 | */ | |
8fe93f8d | 781 | return __rtas_suspend_last_cpu(data, wake_when_done); |
91dc182c | 782 | } else { |
8f5c7579 NL |
783 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
784 | smp_processor_id(), rc); | |
8fe93f8d | 785 | atomic_set(&data->error, rc); |
91dc182c | 786 | } |
f52862f4 | 787 | |
8fe93f8d BK |
788 | if (wake_when_done) { |
789 | atomic_set(&data->done, 1); | |
f52862f4 | 790 | |
8fe93f8d BK |
791 | /* This cpu did the suspend or got an error; in either case, |
792 | * we need to prod all other other cpus out of join state. | |
793 | * Extra prods are harmless. | |
794 | */ | |
795 | for_each_online_cpu(cpu) | |
796 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
797 | } | |
91dc182c | 798 | out: |
8f5c7579 NL |
799 | if (atomic_dec_return(&data->working) == 0) |
800 | complete(data->complete); | |
8fe93f8d BK |
801 | return rc; |
802 | } | |
803 | ||
804 | int rtas_suspend_cpu(struct rtas_suspend_me_data *data) | |
805 | { | |
806 | return __rtas_suspend_cpu(data, 0); | |
807 | } | |
808 | ||
809 | static void rtas_percpu_suspend_me(void *info) | |
810 | { | |
811 | __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); | |
91dc182c DB |
812 | } |
813 | ||
d8862be1 | 814 | int rtas_ibm_suspend_me(struct rtas_args *args) |
91dc182c | 815 | { |
368a6ba5 DB |
816 | long state; |
817 | long rc; | |
b9377ffc | 818 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 819 | struct rtas_suspend_me_data data; |
8f5c7579 NL |
820 | DECLARE_COMPLETION_ONSTACK(done); |
821 | ||
822 | if (!rtas_service_present("ibm,suspend-me")) | |
823 | return -ENOSYS; | |
91dc182c | 824 | |
368a6ba5 | 825 | /* Make sure the state is valid */ |
b9377ffc AB |
826 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
827 | ((u64)args->args[0] << 32) | args->args[1]); | |
828 | ||
829 | state = retbuf[0]; | |
368a6ba5 DB |
830 | |
831 | if (rc) { | |
832 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
833 | return rc; | |
834 | } else if (state == H_VASI_ENABLED) { | |
835 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
836 | return 0; | |
837 | } else if (state != H_VASI_SUSPENDING) { | |
838 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
839 | state); | |
840 | args->args[args->nargs] = -1; | |
841 | return 0; | |
842 | } | |
843 | ||
8f5c7579 | 844 | atomic_set(&data.working, 0); |
f52862f4 | 845 | atomic_set(&data.done, 0); |
8fe93f8d | 846 | atomic_set(&data.error, 0); |
8f5c7579 | 847 | data.token = rtas_token("ibm,suspend-me"); |
8f5c7579 | 848 | data.complete = &done; |
91dc182c DB |
849 | |
850 | /* Call function on all CPUs. One of us will make the | |
851 | * rtas call | |
852 | */ | |
15c8b6c1 | 853 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8fe93f8d | 854 | atomic_set(&data.error, -EINVAL); |
91dc182c | 855 | |
8f5c7579 | 856 | wait_for_completion(&done); |
91dc182c | 857 | |
8fe93f8d | 858 | if (atomic_read(&data.error) != 0) |
8f5c7579 | 859 | printk(KERN_ERR "Error doing global join\n"); |
91dc182c | 860 | |
8fe93f8d | 861 | return atomic_read(&data.error); |
91dc182c DB |
862 | } |
863 | #else /* CONFIG_PPC_PSERIES */ | |
d8862be1 | 864 | int rtas_ibm_suspend_me(struct rtas_args *args) |
91dc182c DB |
865 | { |
866 | return -ENOSYS; | |
867 | } | |
868 | #endif | |
1da177e4 LT |
869 | |
870 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
871 | { | |
872 | struct rtas_args args; | |
873 | unsigned long flags; | |
033ef338 | 874 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 875 | int nargs; |
91dc182c | 876 | int rc; |
1da177e4 LT |
877 | |
878 | if (!capable(CAP_SYS_ADMIN)) | |
879 | return -EPERM; | |
880 | ||
881 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
882 | return -EFAULT; | |
883 | ||
884 | nargs = args.nargs; | |
885 | if (nargs > ARRAY_SIZE(args.args) | |
886 | || args.nret > ARRAY_SIZE(args.args) | |
887 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
888 | return -EINVAL; | |
889 | ||
890 | /* Copy in args. */ | |
891 | if (copy_from_user(args.args, uargs->args, | |
892 | nargs * sizeof(rtas_arg_t)) != 0) | |
893 | return -EFAULT; | |
894 | ||
91dc182c DB |
895 | if (args.token == RTAS_UNKNOWN_SERVICE) |
896 | return -EINVAL; | |
897 | ||
b79998fc NF |
898 | args.rets = &args.args[nargs]; |
899 | memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); | |
900 | ||
91dc182c DB |
901 | /* Need to handle ibm,suspend_me call specially */ |
902 | if (args.token == ibm_suspend_me_token) { | |
903 | rc = rtas_ibm_suspend_me(&args); | |
904 | if (rc) | |
905 | return rc; | |
906 | goto copy_return; | |
907 | } | |
908 | ||
033ef338 | 909 | buff_copy = get_errorlog_buffer(); |
1da177e4 | 910 | |
f97bb36f | 911 | flags = lock_rtas(); |
1da177e4 LT |
912 | |
913 | rtas.args = args; | |
914 | enter_rtas(__pa(&rtas.args)); | |
915 | args = rtas.args; | |
916 | ||
1da177e4 LT |
917 | /* A -1 return code indicates that the last command couldn't |
918 | be completed due to a hardware error. */ | |
033ef338 PM |
919 | if (args.rets[0] == -1) |
920 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 | 921 | |
f97bb36f | 922 | unlock_rtas(flags); |
1da177e4 LT |
923 | |
924 | if (buff_copy) { | |
033ef338 PM |
925 | if (errbuf) |
926 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
927 | kfree(buff_copy); |
928 | } | |
929 | ||
91dc182c | 930 | copy_return: |
1da177e4 LT |
931 | /* Copy out args. */ |
932 | if (copy_to_user(uargs->args + nargs, | |
933 | args.args + nargs, | |
934 | args.nret * sizeof(rtas_arg_t)) != 0) | |
935 | return -EFAULT; | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
1da177e4 | 940 | /* |
943ffb58 | 941 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
942 | * informations from the device-tree and allocate the RMO buffer for userland |
943 | * accesses. | |
944 | */ | |
945 | void __init rtas_initialize(void) | |
946 | { | |
033ef338 PM |
947 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
948 | ||
1da177e4 LT |
949 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
950 | * about it. | |
951 | */ | |
952 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
953 | if (rtas.dev) { | |
a7f67bdf | 954 | const u32 *basep, *entryp, *sizep; |
1da177e4 | 955 | |
e2eb6392 SR |
956 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
957 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); | |
1da177e4 LT |
958 | if (basep != NULL && sizep != NULL) { |
959 | rtas.base = *basep; | |
960 | rtas.size = *sizep; | |
e2eb6392 | 961 | entryp = of_get_property(rtas.dev, |
a7f67bdf | 962 | "linux,rtas-entry", NULL); |
1da177e4 LT |
963 | if (entryp == NULL) /* Ugh */ |
964 | rtas.entry = rtas.base; | |
965 | else | |
966 | rtas.entry = *entryp; | |
967 | } else | |
968 | rtas.dev = NULL; | |
969 | } | |
033ef338 PM |
970 | if (!rtas.dev) |
971 | return; | |
972 | ||
1da177e4 LT |
973 | /* If RTAS was found, allocate the RMO buffer for it and look for |
974 | * the stop-self token if any | |
975 | */ | |
033ef338 | 976 | #ifdef CONFIG_PPC64 |
e8222502 | 977 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
cd3db0c4 | 978 | rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
979 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
980 | } | |
033ef338 | 981 | #endif |
95f72d1e | 982 | rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); |
1da177e4 | 983 | |
033ef338 PM |
984 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
985 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
986 | #endif | |
1da177e4 | 987 | } |
458148c0 ME |
988 | |
989 | int __init early_init_dt_scan_rtas(unsigned long node, | |
990 | const char *uname, int depth, void *data) | |
991 | { | |
992 | u32 *basep, *entryp, *sizep; | |
993 | ||
994 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
995 | return 0; | |
996 | ||
997 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
998 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
999 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
1000 | ||
1001 | if (basep && entryp && sizep) { | |
1002 | rtas.base = *basep; | |
1003 | rtas.entry = *entryp; | |
1004 | rtas.size = *sizep; | |
1005 | } | |
1006 | ||
cc46bb98 ME |
1007 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
1008 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
1009 | if (basep) | |
1010 | rtas_putchar_token = *basep; | |
1011 | ||
1012 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
1013 | if (basep) | |
1014 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
1015 | |
1016 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
1017 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
1018 | udbg_init_rtas_console(); | |
1019 | ||
cc46bb98 ME |
1020 | #endif |
1021 | ||
458148c0 ME |
1022 | /* break now */ |
1023 | return 1; | |
1024 | } | |
c4007a2f | 1025 | |
445c8951 | 1026 | static arch_spinlock_t timebase_lock; |
c4007a2f BH |
1027 | static u64 timebase = 0; |
1028 | ||
1029 | void __cpuinit rtas_give_timebase(void) | |
1030 | { | |
1031 | unsigned long flags; | |
1032 | ||
1033 | local_irq_save(flags); | |
1034 | hard_irq_disable(); | |
0199c4e6 | 1035 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1036 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); |
1037 | timebase = get_tb(); | |
0199c4e6 | 1038 | arch_spin_unlock(&timebase_lock); |
c4007a2f BH |
1039 | |
1040 | while (timebase) | |
1041 | barrier(); | |
1042 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
1043 | local_irq_restore(flags); | |
1044 | } | |
1045 | ||
1046 | void __cpuinit rtas_take_timebase(void) | |
1047 | { | |
1048 | while (!timebase) | |
1049 | barrier(); | |
0199c4e6 | 1050 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1051 | set_tb(timebase >> 32, timebase & 0xffffffff); |
1052 | timebase = 0; | |
0199c4e6 | 1053 | arch_spin_unlock(&timebase_lock); |
c4007a2f | 1054 | } |