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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> | |
4b16f8e2 | 18 | #include <linux/export.h> |
1da177e4 | 19 | #include <linux/init.h> |
a9415644 | 20 | #include <linux/capability.h> |
21fe3301 | 21 | #include <linux/delay.h> |
120496ac | 22 | #include <linux/cpu.h> |
8f5c7579 NL |
23 | #include <linux/smp.h> |
24 | #include <linux/completion.h> | |
25 | #include <linux/cpumask.h> | |
95f72d1e | 26 | #include <linux/memblock.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c5f41752 | 28 | #include <linux/reboot.h> |
1da177e4 LT |
29 | |
30 | #include <asm/prom.h> | |
31 | #include <asm/rtas.h> | |
31a7f67e | 32 | #include <asm/hvcall.h> |
1da177e4 | 33 | #include <asm/machdep.h> |
e8222502 | 34 | #include <asm/firmware.h> |
1da177e4 LT |
35 | #include <asm/page.h> |
36 | #include <asm/param.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> |
1da177e4 | 46 | |
033ef338 | 47 | struct rtas_t rtas = { |
edc35bd7 | 48 | .lock = __ARCH_SPIN_LOCK_UNLOCKED |
1da177e4 | 49 | }; |
ab3ab74d | 50 | EXPORT_SYMBOL(rtas); |
1da177e4 | 51 | |
1da177e4 | 52 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
53 | EXPORT_SYMBOL(rtas_data_buf_lock); |
54 | ||
033ef338 | 55 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
56 | EXPORT_SYMBOL(rtas_data_buf); |
57 | ||
1da177e4 LT |
58 | unsigned long rtas_rmo_buf; |
59 | ||
f4fcbbe9 PM |
60 | /* |
61 | * If non-NULL, this gets called when the kernel terminates. | |
62 | * This is done like this so rtas_flash can be a module. | |
63 | */ | |
64 | void (*rtas_flash_term_hook)(int); | |
65 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
66 | ||
f97bb36f BH |
67 | /* RTAS use home made raw locking instead of spin_lock_irqsave |
68 | * because those can be called from within really nasty contexts | |
69 | * such as having the timebase stopped which would lockup with | |
70 | * normal locks and spinlock debugging enabled | |
71 | */ | |
72 | static unsigned long lock_rtas(void) | |
73 | { | |
74 | unsigned long flags; | |
75 | ||
76 | local_irq_save(flags); | |
77 | preempt_disable(); | |
0199c4e6 | 78 | arch_spin_lock_flags(&rtas.lock, flags); |
f97bb36f BH |
79 | return flags; |
80 | } | |
81 | ||
82 | static void unlock_rtas(unsigned long flags) | |
83 | { | |
0199c4e6 | 84 | arch_spin_unlock(&rtas.lock); |
f97bb36f BH |
85 | local_irq_restore(flags); |
86 | preempt_enable(); | |
87 | } | |
88 | ||
033ef338 PM |
89 | /* |
90 | * call_rtas_display_status and call_rtas_display_status_delay | |
91 | * are designed only for very early low-level debugging, which | |
92 | * is why the token is hard-coded to 10. | |
93 | */ | |
27128264 | 94 | static void call_rtas_display_status(unsigned char c) |
1da177e4 LT |
95 | { |
96 | struct rtas_args *args = &rtas.args; | |
97 | unsigned long s; | |
98 | ||
99 | if (!rtas.base) | |
100 | return; | |
f97bb36f | 101 | s = lock_rtas(); |
1da177e4 | 102 | |
27128264 AB |
103 | args->token = cpu_to_be32(10); |
104 | args->nargs = cpu_to_be32(1); | |
105 | args->nret = cpu_to_be32(1); | |
106 | args->rets = &(args->args[1]); | |
107 | args->args[0] = cpu_to_be32(c); | |
1da177e4 LT |
108 | |
109 | enter_rtas(__pa(args)); | |
110 | ||
f97bb36f | 111 | unlock_rtas(s); |
1da177e4 LT |
112 | } |
113 | ||
296167ae | 114 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
115 | { |
116 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
117 | static int width = 16; | |
118 | ||
119 | if (c == '\n') { | |
120 | while (width-- > 0) | |
121 | call_rtas_display_status(' '); | |
122 | width = 16; | |
21fe3301 | 123 | mdelay(500); |
1da177e4 LT |
124 | pending_newline = 1; |
125 | } else { | |
126 | if (pending_newline) { | |
127 | call_rtas_display_status('\r'); | |
128 | call_rtas_display_status('\n'); | |
129 | } | |
130 | pending_newline = 0; | |
131 | if (width--) { | |
132 | call_rtas_display_status(c); | |
133 | udelay(10000); | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
cc46bb98 | 138 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
139 | { |
140 | udbg_putc = call_rtas_display_status_delay; | |
141 | } | |
142 | ||
cc46bb98 ME |
143 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
144 | ||
145 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
146 | * work, you can hard code the token values for your firmware here and | |
147 | * hardcode rtas.base/entry etc. | |
148 | */ | |
149 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
150 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
151 | ||
152 | static void udbg_rtascon_putc(char c) | |
153 | { | |
154 | int tries; | |
155 | ||
156 | if (!rtas.base) | |
157 | return; | |
158 | ||
159 | /* Add CRs before LFs */ | |
160 | if (c == '\n') | |
161 | udbg_rtascon_putc('\r'); | |
162 | ||
163 | /* if there is more than one character to be displayed, wait a bit */ | |
164 | for (tries = 0; tries < 16; tries++) { | |
165 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
166 | break; | |
167 | udelay(1000); | |
168 | } | |
169 | } | |
170 | ||
171 | static int udbg_rtascon_getc_poll(void) | |
172 | { | |
173 | int c; | |
174 | ||
175 | if (!rtas.base) | |
176 | return -1; | |
177 | ||
178 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
179 | return -1; | |
180 | ||
181 | return c; | |
182 | } | |
183 | ||
184 | static int udbg_rtascon_getc(void) | |
185 | { | |
186 | int c; | |
187 | ||
188 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
189 | ; | |
190 | ||
191 | return c; | |
192 | } | |
193 | ||
194 | ||
195 | void __init udbg_init_rtas_console(void) | |
196 | { | |
197 | udbg_putc = udbg_rtascon_putc; | |
198 | udbg_getc = udbg_rtascon_getc; | |
199 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
200 | } | |
201 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
202 | ||
033ef338 | 203 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
204 | { |
205 | struct device_node *root; | |
a7f67bdf | 206 | int width; |
08bc1dc5 | 207 | const __be32 *p; |
6566c6f1 AB |
208 | char *os; |
209 | static int display_character, set_indicator; | |
a7f67bdf | 210 | static int display_width, display_lines, form_feed; |
c5a69d57 | 211 | static const int *row_width; |
6566c6f1 | 212 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 213 | static int current_line; |
6566c6f1 AB |
214 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
215 | ||
216 | if (!rtas.base) | |
217 | return; | |
218 | ||
8f586b22 MS |
219 | if (display_width == 0) { |
220 | display_width = 0x10; | |
8c8dc322 | 221 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 222 | if ((p = of_get_property(root, |
8f586b22 | 223 | "ibm,display-line-length", NULL))) |
08bc1dc5 | 224 | display_width = be32_to_cpu(*p); |
e2eb6392 | 225 | if ((p = of_get_property(root, |
8f586b22 | 226 | "ibm,form-feed", NULL))) |
08bc1dc5 | 227 | form_feed = be32_to_cpu(*p); |
e2eb6392 | 228 | if ((p = of_get_property(root, |
8f586b22 | 229 | "ibm,display-number-of-lines", NULL))) |
08bc1dc5 | 230 | display_lines = be32_to_cpu(*p); |
e2eb6392 | 231 | row_width = of_get_property(root, |
8f586b22 | 232 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 233 | of_node_put(root); |
8f586b22 | 234 | } |
6566c6f1 AB |
235 | display_character = rtas_token("display-character"); |
236 | set_indicator = rtas_token("set-indicator"); | |
237 | } | |
238 | ||
239 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
240 | /* use hex display if available */ | |
241 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
242 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
243 | return; | |
244 | } | |
245 | ||
246 | spin_lock(&progress_lock); | |
247 | ||
248 | /* | |
249 | * Last write ended with newline, but we didn't print it since | |
250 | * it would just clear the bottom line of output. Print it now | |
251 | * instead. | |
252 | * | |
8f586b22 MS |
253 | * If no newline is pending and form feed is supported, clear the |
254 | * display with a form feed; otherwise, print a CR to start output | |
255 | * at the beginning of the line. | |
6566c6f1 AB |
256 | */ |
257 | if (pending_newline) { | |
258 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
259 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
260 | pending_newline = 0; | |
261 | } else { | |
8f586b22 MS |
262 | current_line = 0; |
263 | if (form_feed) | |
264 | rtas_call(display_character, 1, 1, NULL, | |
265 | (char)form_feed); | |
266 | else | |
267 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
268 | } |
269 | ||
8f586b22 MS |
270 | if (row_width) |
271 | width = row_width[current_line]; | |
272 | else | |
273 | width = display_width; | |
6566c6f1 AB |
274 | os = s; |
275 | while (*os) { | |
276 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
277 | /* If newline is the last character, save it |
278 | * until next call to avoid bumping up the | |
279 | * display output. | |
280 | */ | |
281 | if (*os == '\n' && !os[1]) { | |
282 | pending_newline = 1; | |
8f586b22 MS |
283 | current_line++; |
284 | if (current_line > display_lines-1) | |
285 | current_line = display_lines-1; | |
6566c6f1 AB |
286 | spin_unlock(&progress_lock); |
287 | return; | |
288 | } | |
289 | ||
290 | /* RTAS wants CR-LF, not just LF */ | |
291 | ||
292 | if (*os == '\n') { | |
293 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
294 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
295 | } else { | |
296 | /* CR might be used to re-draw a line, so we'll | |
297 | * leave it alone and not add LF. | |
298 | */ | |
299 | rtas_call(display_character, 1, 1, NULL, *os); | |
300 | } | |
301 | ||
8f586b22 MS |
302 | if (row_width) |
303 | width = row_width[current_line]; | |
304 | else | |
305 | width = display_width; | |
6566c6f1 AB |
306 | } else { |
307 | width--; | |
308 | rtas_call(display_character, 1, 1, NULL, *os); | |
309 | } | |
310 | ||
311 | os++; | |
312 | ||
313 | /* if we overwrite the screen length */ | |
314 | if (width <= 0) | |
315 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
316 | os++; | |
317 | } | |
318 | ||
6566c6f1 AB |
319 | spin_unlock(&progress_lock); |
320 | } | |
f4fcbbe9 | 321 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 322 | |
033ef338 | 323 | int rtas_token(const char *service) |
1da177e4 | 324 | { |
08bc1dc5 | 325 | const __be32 *tokp; |
033ef338 | 326 | if (rtas.dev == NULL) |
1da177e4 | 327 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 328 | tokp = of_get_property(rtas.dev, service, NULL); |
08bc1dc5 | 329 | return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE; |
1da177e4 | 330 | } |
ab3ab74d | 331 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 332 | |
f2d6d2d8 NL |
333 | int rtas_service_present(const char *service) |
334 | { | |
335 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
336 | } | |
337 | EXPORT_SYMBOL(rtas_service_present); | |
338 | ||
033ef338 | 339 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
340 | /* |
341 | * Return the firmware-specified size of the error log buffer | |
342 | * for all rtas calls that require an error buffer argument. | |
343 | * This includes 'check-exception' and 'rtas-last-error'. | |
344 | */ | |
345 | int rtas_get_error_log_max(void) | |
346 | { | |
347 | static int rtas_error_log_max; | |
348 | if (rtas_error_log_max) | |
349 | return rtas_error_log_max; | |
350 | ||
351 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
352 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
353 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
354 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
355 | rtas_error_log_max); | |
1da177e4 LT |
356 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
357 | } | |
358 | return rtas_error_log_max; | |
359 | } | |
033ef338 | 360 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
361 | |
362 | ||
1c21a293 ME |
363 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
364 | static int rtas_last_error_token; | |
033ef338 | 365 | |
1da177e4 LT |
366 | /** Return a copy of the detailed error text associated with the |
367 | * most recent failed call to rtas. Because the error text | |
368 | * might go stale if there are any other intervening rtas calls, | |
369 | * this routine must be called atomically with whatever produced | |
370 | * the error (i.e. with rtas.lock still held from the previous call). | |
371 | */ | |
033ef338 | 372 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
373 | { |
374 | struct rtas_args err_args, save_args; | |
375 | u32 bufsz; | |
033ef338 PM |
376 | char *buf = NULL; |
377 | ||
378 | if (rtas_last_error_token == -1) | |
379 | return NULL; | |
1da177e4 LT |
380 | |
381 | bufsz = rtas_get_error_log_max(); | |
382 | ||
27128264 AB |
383 | err_args.token = cpu_to_be32(rtas_last_error_token); |
384 | err_args.nargs = cpu_to_be32(2); | |
385 | err_args.nret = cpu_to_be32(1); | |
386 | err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); | |
387 | err_args.args[1] = cpu_to_be32(bufsz); | |
1da177e4 LT |
388 | err_args.args[2] = 0; |
389 | ||
390 | save_args = rtas.args; | |
391 | rtas.args = err_args; | |
392 | ||
393 | enter_rtas(__pa(&rtas.args)); | |
394 | ||
395 | err_args = rtas.args; | |
396 | rtas.args = save_args; | |
397 | ||
033ef338 PM |
398 | /* Log the error in the unlikely case that there was one. */ |
399 | if (unlikely(err_args.args[2] == 0)) { | |
400 | if (altbuf) { | |
401 | buf = altbuf; | |
402 | } else { | |
403 | buf = rtas_err_buf; | |
404 | if (mem_init_done) | |
405 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
406 | } | |
407 | if (buf) | |
408 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
409 | } | |
410 | ||
411 | return buf; | |
1da177e4 LT |
412 | } |
413 | ||
033ef338 PM |
414 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
415 | ||
416 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
417 | #define __fetch_rtas_last_error(x) NULL | |
418 | #define get_errorlog_buffer() NULL | |
419 | #endif | |
420 | ||
1da177e4 LT |
421 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
422 | { | |
423 | va_list list; | |
033ef338 | 424 | int i; |
1da177e4 LT |
425 | unsigned long s; |
426 | struct rtas_args *rtas_args; | |
033ef338 | 427 | char *buff_copy = NULL; |
1da177e4 LT |
428 | int ret; |
429 | ||
24da3dd5 | 430 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
431 | return -1; |
432 | ||
f97bb36f | 433 | s = lock_rtas(); |
1da177e4 LT |
434 | rtas_args = &rtas.args; |
435 | ||
27128264 AB |
436 | rtas_args->token = cpu_to_be32(token); |
437 | rtas_args->nargs = cpu_to_be32(nargs); | |
438 | rtas_args->nret = cpu_to_be32(nret); | |
439 | rtas_args->rets = &(rtas_args->args[nargs]); | |
1da177e4 | 440 | va_start(list, outputs); |
033ef338 | 441 | for (i = 0; i < nargs; ++i) |
27128264 | 442 | rtas_args->args[i] = cpu_to_be32(va_arg(list, __u32)); |
1da177e4 LT |
443 | va_end(list); |
444 | ||
445 | for (i = 0; i < nret; ++i) | |
446 | rtas_args->rets[i] = 0; | |
447 | ||
1da177e4 | 448 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
449 | |
450 | /* A -1 return code indicates that the last command couldn't | |
451 | be completed due to a hardware error. */ | |
27128264 | 452 | if (be32_to_cpu(rtas_args->rets[0]) == -1) |
033ef338 | 453 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
454 | |
455 | if (nret > 1 && outputs != NULL) | |
456 | for (i = 0; i < nret-1; ++i) | |
27128264 AB |
457 | outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); |
458 | ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; | |
1da177e4 | 459 | |
f97bb36f | 460 | unlock_rtas(s); |
1da177e4 LT |
461 | |
462 | if (buff_copy) { | |
463 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
464 | if (mem_init_done) | |
465 | kfree(buff_copy); | |
466 | } | |
467 | return ret; | |
468 | } | |
ab3ab74d | 469 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 470 | |
507279db JR |
471 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
472 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 473 | */ |
507279db | 474 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 475 | { |
507279db JR |
476 | int order; |
477 | unsigned int ms = 0; | |
478 | ||
479 | if (status == RTAS_BUSY) { | |
480 | ms = 1; | |
481 | } else if (status >= 9900 && status <= 9905) { | |
482 | order = status - 9900; | |
483 | for (ms = 1; order > 0; order--) | |
484 | ms *= 10; | |
485 | } | |
1da177e4 | 486 | |
507279db JR |
487 | return ms; |
488 | } | |
ab3ab74d | 489 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 490 | |
507279db JR |
491 | /* For an RTAS busy status code, perform the hinted delay. */ |
492 | unsigned int rtas_busy_delay(int status) | |
493 | { | |
494 | unsigned int ms; | |
1da177e4 | 495 | |
507279db JR |
496 | might_sleep(); |
497 | ms = rtas_busy_delay_time(status); | |
eca590f4 | 498 | if (ms && need_resched()) |
507279db JR |
499 | msleep(ms); |
500 | ||
501 | return ms; | |
1da177e4 | 502 | } |
ab3ab74d | 503 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 504 | |
1c21a293 | 505 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
506 | { |
507 | int rc; | |
508 | ||
509 | switch (rtas_rc) { | |
510 | case -1: /* Hardware Error */ | |
511 | rc = -EIO; | |
512 | break; | |
513 | case -3: /* Bad indicator/domain/etc */ | |
514 | rc = -EINVAL; | |
515 | break; | |
516 | case -9000: /* Isolation error */ | |
517 | rc = -EFAULT; | |
518 | break; | |
519 | case -9001: /* Outstanding TCE/PTE */ | |
520 | rc = -EEXIST; | |
521 | break; | |
522 | case -9002: /* No usable slot */ | |
523 | rc = -ENODEV; | |
524 | break; | |
525 | default: | |
526 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 527 | __func__, rtas_rc); |
1da177e4 LT |
528 | rc = -ERANGE; |
529 | break; | |
530 | } | |
531 | return rc; | |
532 | } | |
533 | ||
534 | int rtas_get_power_level(int powerdomain, int *level) | |
535 | { | |
536 | int token = rtas_token("get-power-level"); | |
537 | int rc; | |
538 | ||
539 | if (token == RTAS_UNKNOWN_SERVICE) | |
540 | return -ENOENT; | |
541 | ||
542 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
543 | udelay(1); | |
544 | ||
545 | if (rc < 0) | |
546 | return rtas_error_rc(rc); | |
547 | return rc; | |
548 | } | |
ab3ab74d | 549 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
550 | |
551 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
552 | { | |
553 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
554 | int rc; |
555 | ||
556 | if (token == RTAS_UNKNOWN_SERVICE) | |
557 | return -ENOENT; | |
558 | ||
507279db | 559 | do { |
1da177e4 | 560 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 561 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
562 | |
563 | if (rc < 0) | |
564 | return rtas_error_rc(rc); | |
565 | return rc; | |
566 | } | |
ab3ab74d | 567 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
568 | |
569 | int rtas_get_sensor(int sensor, int index, int *state) | |
570 | { | |
571 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
572 | int rc; |
573 | ||
574 | if (token == RTAS_UNKNOWN_SERVICE) | |
575 | return -ENOENT; | |
576 | ||
507279db | 577 | do { |
1da177e4 | 578 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 579 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
580 | |
581 | if (rc < 0) | |
582 | return rtas_error_rc(rc); | |
583 | return rc; | |
584 | } | |
ab3ab74d | 585 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 | 586 | |
edc72ac4 NL |
587 | bool rtas_indicator_present(int token, int *maxindex) |
588 | { | |
589 | int proplen, count, i; | |
590 | const struct indicator_elem { | |
08bc1dc5 AB |
591 | __be32 token; |
592 | __be32 maxindex; | |
edc72ac4 NL |
593 | } *indicators; |
594 | ||
595 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); | |
596 | if (!indicators) | |
597 | return false; | |
598 | ||
599 | count = proplen / sizeof(struct indicator_elem); | |
600 | ||
601 | for (i = 0; i < count; i++) { | |
08bc1dc5 | 602 | if (__be32_to_cpu(indicators[i].token) != token) |
edc72ac4 NL |
603 | continue; |
604 | if (maxindex) | |
08bc1dc5 | 605 | *maxindex = __be32_to_cpu(indicators[i].maxindex); |
edc72ac4 NL |
606 | return true; |
607 | } | |
608 | ||
609 | return false; | |
610 | } | |
611 | EXPORT_SYMBOL(rtas_indicator_present); | |
612 | ||
1da177e4 LT |
613 | int rtas_set_indicator(int indicator, int index, int new_value) |
614 | { | |
615 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
616 | int rc; |
617 | ||
618 | if (token == RTAS_UNKNOWN_SERVICE) | |
619 | return -ENOENT; | |
620 | ||
507279db | 621 | do { |
1da177e4 | 622 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 623 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
624 | |
625 | if (rc < 0) | |
626 | return rtas_error_rc(rc); | |
627 | return rc; | |
628 | } | |
ab3ab74d | 629 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 630 | |
81b73dd9 HM |
631 | /* |
632 | * Ignoring RTAS extended delay | |
633 | */ | |
634 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
635 | { | |
636 | int rc; | |
637 | int token = rtas_token("set-indicator"); | |
638 | ||
639 | if (token == RTAS_UNKNOWN_SERVICE) | |
640 | return -ENOENT; | |
641 | ||
642 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
643 | ||
644 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); | |
645 | ||
646 | if (rc < 0) | |
647 | return rtas_error_rc(rc); | |
648 | ||
649 | return rc; | |
650 | } | |
651 | ||
033ef338 | 652 | void rtas_restart(char *cmd) |
1da177e4 | 653 | { |
f4fcbbe9 PM |
654 | if (rtas_flash_term_hook) |
655 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
656 | printk("RTAS system-reboot returned %d\n", |
657 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
658 | for (;;); | |
659 | } | |
660 | ||
033ef338 | 661 | void rtas_power_off(void) |
1da177e4 | 662 | { |
f4fcbbe9 PM |
663 | if (rtas_flash_term_hook) |
664 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
665 | /* allow power on only with power button press */ |
666 | printk("RTAS power-off returned %d\n", | |
667 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
668 | for (;;); | |
669 | } | |
670 | ||
033ef338 | 671 | void rtas_halt(void) |
1da177e4 | 672 | { |
f4fcbbe9 PM |
673 | if (rtas_flash_term_hook) |
674 | rtas_flash_term_hook(SYS_HALT); | |
675 | /* allow power on only with power button press */ | |
676 | printk("RTAS power-off returned %d\n", | |
677 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
678 | for (;;); | |
1da177e4 LT |
679 | } |
680 | ||
681 | /* Must be in the RMO region, so we place it here */ | |
682 | static char rtas_os_term_buf[2048]; | |
683 | ||
8f515061 | 684 | void rtas_os_term(char *str) |
a2b51812 LV |
685 | { |
686 | int status; | |
39ed2fe6 | 687 | |
e9bbc8cd AB |
688 | /* |
689 | * Firmware with the ibm,extended-os-term property is guaranteed | |
690 | * to always return from an ibm,os-term call. Earlier versions without | |
691 | * this property may terminate the partition which we want to avoid | |
692 | * since it interferes with panic_timeout. | |
693 | */ | |
694 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || | |
695 | RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) | |
1da177e4 LT |
696 | return; |
697 | ||
8f515061 PM |
698 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
699 | ||
1da177e4 LT |
700 | do { |
701 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
702 | __pa(rtas_os_term_buf)); | |
507279db | 703 | } while (rtas_busy_delay(status)); |
1da177e4 | 704 | |
507279db | 705 | if (status != 0) |
e9bbc8cd | 706 | printk(KERN_EMERG "ibm,os-term call failed %d\n", status); |
1da177e4 LT |
707 | } |
708 | ||
91dc182c DB |
709 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
710 | #ifdef CONFIG_PPC_PSERIES | |
8fe93f8d BK |
711 | static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
712 | { | |
713 | u16 slb_size = mmu_slb_size; | |
714 | int rc = H_MULTI_THREADS_ACTIVE; | |
715 | int cpu; | |
716 | ||
717 | slb_set_size(SLB_MIN_SIZE); | |
718 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); | |
719 | ||
720 | while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && | |
721 | !atomic_read(&data->error)) | |
722 | rc = rtas_call(data->token, 0, 1, NULL); | |
723 | ||
724 | if (rc || atomic_read(&data->error)) { | |
725 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); | |
726 | slb_set_size(slb_size); | |
727 | } | |
728 | ||
729 | if (atomic_read(&data->error)) | |
730 | rc = atomic_read(&data->error); | |
731 | ||
732 | atomic_set(&data->error, rc); | |
9ee820fa | 733 | pSeries_coalesce_init(); |
8fe93f8d BK |
734 | |
735 | if (wake_when_done) { | |
736 | atomic_set(&data->done, 1); | |
737 | ||
738 | for_each_online_cpu(cpu) | |
739 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
740 | } | |
741 | ||
742 | if (atomic_dec_return(&data->working) == 0) | |
743 | complete(data->complete); | |
744 | ||
745 | return rc; | |
746 | } | |
747 | ||
748 | int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) | |
749 | { | |
750 | atomic_inc(&data->working); | |
751 | return __rtas_suspend_last_cpu(data, 0); | |
752 | } | |
753 | ||
754 | static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) | |
91dc182c | 755 | { |
f52862f4 | 756 | long rc = H_SUCCESS; |
8f5c7579 NL |
757 | unsigned long msr_save; |
758 | int cpu; | |
91dc182c | 759 | |
8f5c7579 NL |
760 | atomic_inc(&data->working); |
761 | ||
762 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
763 | msr_save = mfmsr(); | |
764 | mtmsr(msr_save & ~(MSR_EE)); | |
765 | ||
8fe93f8d | 766 | while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) |
f52862f4 | 767 | rc = plpar_hcall_norets(H_JOIN); |
8f5c7579 NL |
768 | |
769 | mtmsr(msr_save); | |
91dc182c | 770 | |
8f5c7579 NL |
771 | if (rc == H_SUCCESS) { |
772 | /* This cpu was prodded and the suspend is complete. */ | |
773 | goto out; | |
774 | } else if (rc == H_CONTINUE) { | |
775 | /* All other cpus are in H_JOIN, this cpu does | |
776 | * the suspend. | |
777 | */ | |
8fe93f8d | 778 | return __rtas_suspend_last_cpu(data, wake_when_done); |
91dc182c | 779 | } else { |
8f5c7579 NL |
780 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
781 | smp_processor_id(), rc); | |
8fe93f8d | 782 | atomic_set(&data->error, rc); |
91dc182c | 783 | } |
f52862f4 | 784 | |
8fe93f8d BK |
785 | if (wake_when_done) { |
786 | atomic_set(&data->done, 1); | |
f52862f4 | 787 | |
8fe93f8d BK |
788 | /* This cpu did the suspend or got an error; in either case, |
789 | * we need to prod all other other cpus out of join state. | |
790 | * Extra prods are harmless. | |
791 | */ | |
792 | for_each_online_cpu(cpu) | |
793 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
794 | } | |
91dc182c | 795 | out: |
8f5c7579 NL |
796 | if (atomic_dec_return(&data->working) == 0) |
797 | complete(data->complete); | |
8fe93f8d BK |
798 | return rc; |
799 | } | |
800 | ||
801 | int rtas_suspend_cpu(struct rtas_suspend_me_data *data) | |
802 | { | |
803 | return __rtas_suspend_cpu(data, 0); | |
804 | } | |
805 | ||
806 | static void rtas_percpu_suspend_me(void *info) | |
807 | { | |
808 | __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); | |
91dc182c DB |
809 | } |
810 | ||
120496ac RJ |
811 | enum rtas_cpu_state { |
812 | DOWN, | |
813 | UP, | |
814 | }; | |
815 | ||
816 | #ifndef CONFIG_SMP | |
817 | static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, | |
818 | cpumask_var_t cpus) | |
819 | { | |
820 | if (!cpumask_empty(cpus)) { | |
821 | cpumask_clear(cpus); | |
822 | return -EINVAL; | |
823 | } else | |
824 | return 0; | |
825 | } | |
826 | #else | |
827 | /* On return cpumask will be altered to indicate CPUs changed. | |
828 | * CPUs with states changed will be set in the mask, | |
829 | * CPUs with status unchanged will be unset in the mask. */ | |
830 | static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, | |
831 | cpumask_var_t cpus) | |
832 | { | |
833 | int cpu; | |
834 | int cpuret = 0; | |
835 | int ret = 0; | |
836 | ||
837 | if (cpumask_empty(cpus)) | |
838 | return 0; | |
839 | ||
840 | for_each_cpu(cpu, cpus) { | |
841 | switch (state) { | |
842 | case DOWN: | |
843 | cpuret = cpu_down(cpu); | |
844 | break; | |
845 | case UP: | |
846 | cpuret = cpu_up(cpu); | |
847 | break; | |
848 | } | |
849 | if (cpuret) { | |
850 | pr_debug("%s: cpu_%s for cpu#%d returned %d.\n", | |
851 | __func__, | |
852 | ((state == UP) ? "up" : "down"), | |
853 | cpu, cpuret); | |
854 | if (!ret) | |
855 | ret = cpuret; | |
856 | if (state == UP) { | |
857 | /* clear bits for unchanged cpus, return */ | |
858 | cpumask_shift_right(cpus, cpus, cpu); | |
859 | cpumask_shift_left(cpus, cpus, cpu); | |
860 | break; | |
861 | } else { | |
862 | /* clear bit for unchanged cpu, continue */ | |
863 | cpumask_clear_cpu(cpu, cpus); | |
864 | } | |
865 | } | |
866 | } | |
867 | ||
868 | return ret; | |
869 | } | |
870 | #endif | |
871 | ||
872 | int rtas_online_cpus_mask(cpumask_var_t cpus) | |
873 | { | |
874 | int ret; | |
875 | ||
876 | ret = rtas_cpu_state_change_mask(UP, cpus); | |
877 | ||
878 | if (ret) { | |
879 | cpumask_var_t tmp_mask; | |
880 | ||
881 | if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY)) | |
882 | return ret; | |
883 | ||
884 | /* Use tmp_mask to preserve cpus mask from first failure */ | |
885 | cpumask_copy(tmp_mask, cpus); | |
886 | rtas_offline_cpus_mask(tmp_mask); | |
887 | free_cpumask_var(tmp_mask); | |
888 | } | |
889 | ||
890 | return ret; | |
891 | } | |
892 | EXPORT_SYMBOL(rtas_online_cpus_mask); | |
893 | ||
894 | int rtas_offline_cpus_mask(cpumask_var_t cpus) | |
895 | { | |
896 | return rtas_cpu_state_change_mask(DOWN, cpus); | |
897 | } | |
898 | EXPORT_SYMBOL(rtas_offline_cpus_mask); | |
899 | ||
d8862be1 | 900 | int rtas_ibm_suspend_me(struct rtas_args *args) |
91dc182c | 901 | { |
368a6ba5 DB |
902 | long state; |
903 | long rc; | |
b9377ffc | 904 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 905 | struct rtas_suspend_me_data data; |
8f5c7579 | 906 | DECLARE_COMPLETION_ONSTACK(done); |
120496ac RJ |
907 | cpumask_var_t offline_mask; |
908 | int cpuret; | |
8f5c7579 NL |
909 | |
910 | if (!rtas_service_present("ibm,suspend-me")) | |
911 | return -ENOSYS; | |
91dc182c | 912 | |
368a6ba5 | 913 | /* Make sure the state is valid */ |
b9377ffc AB |
914 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
915 | ((u64)args->args[0] << 32) | args->args[1]); | |
916 | ||
917 | state = retbuf[0]; | |
368a6ba5 DB |
918 | |
919 | if (rc) { | |
920 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
921 | return rc; | |
922 | } else if (state == H_VASI_ENABLED) { | |
923 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
924 | return 0; | |
925 | } else if (state != H_VASI_SUSPENDING) { | |
926 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
927 | state); | |
928 | args->args[args->nargs] = -1; | |
929 | return 0; | |
930 | } | |
931 | ||
120496ac RJ |
932 | if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY)) |
933 | return -ENOMEM; | |
934 | ||
8f5c7579 | 935 | atomic_set(&data.working, 0); |
f52862f4 | 936 | atomic_set(&data.done, 0); |
8fe93f8d | 937 | atomic_set(&data.error, 0); |
8f5c7579 | 938 | data.token = rtas_token("ibm,suspend-me"); |
8f5c7579 | 939 | data.complete = &done; |
120496ac RJ |
940 | |
941 | /* All present CPUs must be online */ | |
942 | cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask); | |
943 | cpuret = rtas_online_cpus_mask(offline_mask); | |
944 | if (cpuret) { | |
945 | pr_err("%s: Could not bring present CPUs online.\n", __func__); | |
946 | atomic_set(&data.error, cpuret); | |
947 | goto out; | |
948 | } | |
949 | ||
444080d1 | 950 | stop_topology_update(); |
91dc182c DB |
951 | |
952 | /* Call function on all CPUs. One of us will make the | |
953 | * rtas call | |
954 | */ | |
15c8b6c1 | 955 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8fe93f8d | 956 | atomic_set(&data.error, -EINVAL); |
91dc182c | 957 | |
8f5c7579 | 958 | wait_for_completion(&done); |
91dc182c | 959 | |
8fe93f8d | 960 | if (atomic_read(&data.error) != 0) |
8f5c7579 | 961 | printk(KERN_ERR "Error doing global join\n"); |
91dc182c | 962 | |
444080d1 BK |
963 | start_topology_update(); |
964 | ||
120496ac RJ |
965 | /* Take down CPUs not online prior to suspend */ |
966 | cpuret = rtas_offline_cpus_mask(offline_mask); | |
967 | if (cpuret) | |
968 | pr_warn("%s: Could not restore CPUs to offline state.\n", | |
969 | __func__); | |
970 | ||
971 | out: | |
972 | free_cpumask_var(offline_mask); | |
8fe93f8d | 973 | return atomic_read(&data.error); |
91dc182c DB |
974 | } |
975 | #else /* CONFIG_PPC_PSERIES */ | |
d8862be1 | 976 | int rtas_ibm_suspend_me(struct rtas_args *args) |
91dc182c DB |
977 | { |
978 | return -ENOSYS; | |
979 | } | |
980 | #endif | |
1da177e4 | 981 | |
6431f208 AB |
982 | /** |
983 | * Find a specific pseries error log in an RTAS extended event log. | |
984 | * @log: RTAS error/event log | |
985 | * @section_id: two character section identifier | |
986 | * | |
987 | * Returns a pointer to the specified errorlog or NULL if not found. | |
988 | */ | |
989 | struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, | |
990 | uint16_t section_id) | |
991 | { | |
992 | struct rtas_ext_event_log_v6 *ext_log = | |
993 | (struct rtas_ext_event_log_v6 *)log->buffer; | |
994 | struct pseries_errorlog *sect; | |
995 | unsigned char *p, *log_end; | |
a08a53ea GK |
996 | uint32_t ext_log_length = rtas_error_extended_log_length(log); |
997 | uint8_t log_format = rtas_ext_event_log_format(ext_log); | |
998 | uint32_t company_id = rtas_ext_event_company_id(ext_log); | |
6431f208 AB |
999 | |
1000 | /* Check that we understand the format */ | |
a08a53ea GK |
1001 | if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) || |
1002 | log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || | |
1003 | company_id != RTAS_V6EXT_COMPANY_ID_IBM) | |
6431f208 AB |
1004 | return NULL; |
1005 | ||
a08a53ea | 1006 | log_end = log->buffer + ext_log_length; |
6431f208 AB |
1007 | p = ext_log->vendor_log; |
1008 | ||
1009 | while (p < log_end) { | |
1010 | sect = (struct pseries_errorlog *)p; | |
a08a53ea | 1011 | if (pseries_errorlog_id(sect) == section_id) |
6431f208 | 1012 | return sect; |
a08a53ea | 1013 | p += pseries_errorlog_length(sect); |
6431f208 AB |
1014 | } |
1015 | ||
1016 | return NULL; | |
1017 | } | |
1018 | ||
599d2870 | 1019 | /* We assume to be passed big endian arguments */ |
1da177e4 LT |
1020 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) |
1021 | { | |
1022 | struct rtas_args args; | |
1023 | unsigned long flags; | |
033ef338 | 1024 | char *buff_copy, *errbuf = NULL; |
599d2870 | 1025 | int nargs, nret, token; |
91dc182c | 1026 | int rc; |
1da177e4 LT |
1027 | |
1028 | if (!capable(CAP_SYS_ADMIN)) | |
1029 | return -EPERM; | |
1030 | ||
1031 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
1032 | return -EFAULT; | |
1033 | ||
599d2870 GK |
1034 | nargs = be32_to_cpu(args.nargs); |
1035 | nret = be32_to_cpu(args.nret); | |
1036 | token = be32_to_cpu(args.token); | |
1037 | ||
1da177e4 | 1038 | if (nargs > ARRAY_SIZE(args.args) |
599d2870 GK |
1039 | || nret > ARRAY_SIZE(args.args) |
1040 | || nargs + nret > ARRAY_SIZE(args.args)) | |
1da177e4 LT |
1041 | return -EINVAL; |
1042 | ||
1043 | /* Copy in args. */ | |
1044 | if (copy_from_user(args.args, uargs->args, | |
1045 | nargs * sizeof(rtas_arg_t)) != 0) | |
1046 | return -EFAULT; | |
1047 | ||
599d2870 | 1048 | if (token == RTAS_UNKNOWN_SERVICE) |
91dc182c DB |
1049 | return -EINVAL; |
1050 | ||
b79998fc | 1051 | args.rets = &args.args[nargs]; |
599d2870 | 1052 | memset(args.rets, 0, nret * sizeof(rtas_arg_t)); |
b79998fc | 1053 | |
91dc182c | 1054 | /* Need to handle ibm,suspend_me call specially */ |
599d2870 | 1055 | if (token == ibm_suspend_me_token) { |
91dc182c DB |
1056 | rc = rtas_ibm_suspend_me(&args); |
1057 | if (rc) | |
1058 | return rc; | |
1059 | goto copy_return; | |
1060 | } | |
1061 | ||
033ef338 | 1062 | buff_copy = get_errorlog_buffer(); |
1da177e4 | 1063 | |
f97bb36f | 1064 | flags = lock_rtas(); |
1da177e4 LT |
1065 | |
1066 | rtas.args = args; | |
1067 | enter_rtas(__pa(&rtas.args)); | |
1068 | args = rtas.args; | |
1069 | ||
1da177e4 LT |
1070 | /* A -1 return code indicates that the last command couldn't |
1071 | be completed due to a hardware error. */ | |
599d2870 | 1072 | if (be32_to_cpu(args.rets[0]) == -1) |
033ef338 | 1073 | errbuf = __fetch_rtas_last_error(buff_copy); |
1da177e4 | 1074 | |
f97bb36f | 1075 | unlock_rtas(flags); |
1da177e4 LT |
1076 | |
1077 | if (buff_copy) { | |
033ef338 PM |
1078 | if (errbuf) |
1079 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
1080 | kfree(buff_copy); |
1081 | } | |
1082 | ||
91dc182c | 1083 | copy_return: |
1da177e4 LT |
1084 | /* Copy out args. */ |
1085 | if (copy_to_user(uargs->args + nargs, | |
1086 | args.args + nargs, | |
599d2870 | 1087 | nret * sizeof(rtas_arg_t)) != 0) |
1da177e4 LT |
1088 | return -EFAULT; |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1da177e4 | 1093 | /* |
14ed7409 AB |
1094 | * Call early during boot, before mem init, to retrieve the RTAS |
1095 | * information from the device-tree and allocate the RMO buffer for userland | |
1da177e4 LT |
1096 | * accesses. |
1097 | */ | |
1098 | void __init rtas_initialize(void) | |
1099 | { | |
033ef338 PM |
1100 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
1101 | ||
1da177e4 LT |
1102 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
1103 | * about it. | |
1104 | */ | |
1105 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
1106 | if (rtas.dev) { | |
08bc1dc5 | 1107 | const __be32 *basep, *entryp, *sizep; |
1da177e4 | 1108 | |
e2eb6392 SR |
1109 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
1110 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); | |
1da177e4 | 1111 | if (basep != NULL && sizep != NULL) { |
08bc1dc5 AB |
1112 | rtas.base = __be32_to_cpu(*basep); |
1113 | rtas.size = __be32_to_cpu(*sizep); | |
e2eb6392 | 1114 | entryp = of_get_property(rtas.dev, |
a7f67bdf | 1115 | "linux,rtas-entry", NULL); |
1da177e4 LT |
1116 | if (entryp == NULL) /* Ugh */ |
1117 | rtas.entry = rtas.base; | |
1118 | else | |
08bc1dc5 | 1119 | rtas.entry = __be32_to_cpu(*entryp); |
1da177e4 LT |
1120 | } else |
1121 | rtas.dev = NULL; | |
1122 | } | |
033ef338 PM |
1123 | if (!rtas.dev) |
1124 | return; | |
1125 | ||
1da177e4 LT |
1126 | /* If RTAS was found, allocate the RMO buffer for it and look for |
1127 | * the stop-self token if any | |
1128 | */ | |
033ef338 | 1129 | #ifdef CONFIG_PPC64 |
e8222502 | 1130 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
cd3db0c4 | 1131 | rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
1132 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
1133 | } | |
033ef338 | 1134 | #endif |
95f72d1e | 1135 | rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); |
1da177e4 | 1136 | |
033ef338 PM |
1137 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1138 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
1139 | #endif | |
1da177e4 | 1140 | } |
458148c0 ME |
1141 | |
1142 | int __init early_init_dt_scan_rtas(unsigned long node, | |
1143 | const char *uname, int depth, void *data) | |
1144 | { | |
9d0c4dfe | 1145 | const u32 *basep, *entryp, *sizep; |
458148c0 ME |
1146 | |
1147 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
1148 | return 0; | |
1149 | ||
1150 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
1151 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
1152 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
1153 | ||
1154 | if (basep && entryp && sizep) { | |
1155 | rtas.base = *basep; | |
1156 | rtas.entry = *entryp; | |
1157 | rtas.size = *sizep; | |
1158 | } | |
1159 | ||
cc46bb98 ME |
1160 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
1161 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
1162 | if (basep) | |
1163 | rtas_putchar_token = *basep; | |
1164 | ||
1165 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
1166 | if (basep) | |
1167 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
1168 | |
1169 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
1170 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
1171 | udbg_init_rtas_console(); | |
1172 | ||
cc46bb98 ME |
1173 | #endif |
1174 | ||
458148c0 ME |
1175 | /* break now */ |
1176 | return 1; | |
1177 | } | |
c4007a2f | 1178 | |
445c8951 | 1179 | static arch_spinlock_t timebase_lock; |
c4007a2f BH |
1180 | static u64 timebase = 0; |
1181 | ||
061d19f2 | 1182 | void rtas_give_timebase(void) |
c4007a2f BH |
1183 | { |
1184 | unsigned long flags; | |
1185 | ||
1186 | local_irq_save(flags); | |
1187 | hard_irq_disable(); | |
0199c4e6 | 1188 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1189 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); |
1190 | timebase = get_tb(); | |
0199c4e6 | 1191 | arch_spin_unlock(&timebase_lock); |
c4007a2f BH |
1192 | |
1193 | while (timebase) | |
1194 | barrier(); | |
1195 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
1196 | local_irq_restore(flags); | |
1197 | } | |
1198 | ||
061d19f2 | 1199 | void rtas_take_timebase(void) |
c4007a2f BH |
1200 | { |
1201 | while (!timebase) | |
1202 | barrier(); | |
0199c4e6 | 1203 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1204 | set_tb(timebase >> 32, timebase & 0xffffffff); |
1205 | timebase = 0; | |
0199c4e6 | 1206 | arch_spin_unlock(&timebase_lock); |
c4007a2f | 1207 | } |