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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 | |
cd5cdeb6 ME |
47 | /* This is here deliberately so it's only used in this file */ |
48 | void enter_rtas(unsigned long); | |
49 | ||
033ef338 | 50 | struct rtas_t rtas = { |
edc35bd7 | 51 | .lock = __ARCH_SPIN_LOCK_UNLOCKED |
1da177e4 | 52 | }; |
ab3ab74d | 53 | EXPORT_SYMBOL(rtas); |
1da177e4 | 54 | |
1da177e4 | 55 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
56 | EXPORT_SYMBOL(rtas_data_buf_lock); |
57 | ||
033ef338 | 58 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
59 | EXPORT_SYMBOL(rtas_data_buf); |
60 | ||
1da177e4 LT |
61 | unsigned long rtas_rmo_buf; |
62 | ||
f4fcbbe9 PM |
63 | /* |
64 | * If non-NULL, this gets called when the kernel terminates. | |
65 | * This is done like this so rtas_flash can be a module. | |
66 | */ | |
67 | void (*rtas_flash_term_hook)(int); | |
68 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
69 | ||
f97bb36f BH |
70 | /* RTAS use home made raw locking instead of spin_lock_irqsave |
71 | * because those can be called from within really nasty contexts | |
72 | * such as having the timebase stopped which would lockup with | |
73 | * normal locks and spinlock debugging enabled | |
74 | */ | |
75 | static unsigned long lock_rtas(void) | |
76 | { | |
77 | unsigned long flags; | |
78 | ||
79 | local_irq_save(flags); | |
80 | preempt_disable(); | |
0199c4e6 | 81 | arch_spin_lock_flags(&rtas.lock, flags); |
f97bb36f BH |
82 | return flags; |
83 | } | |
84 | ||
85 | static void unlock_rtas(unsigned long flags) | |
86 | { | |
0199c4e6 | 87 | arch_spin_unlock(&rtas.lock); |
f97bb36f BH |
88 | local_irq_restore(flags); |
89 | preempt_enable(); | |
90 | } | |
91 | ||
033ef338 PM |
92 | /* |
93 | * call_rtas_display_status and call_rtas_display_status_delay | |
94 | * are designed only for very early low-level debugging, which | |
95 | * is why the token is hard-coded to 10. | |
96 | */ | |
27128264 | 97 | static void call_rtas_display_status(unsigned char c) |
1da177e4 | 98 | { |
1da177e4 LT |
99 | unsigned long s; |
100 | ||
101 | if (!rtas.base) | |
102 | return; | |
1da177e4 | 103 | |
4456f452 ME |
104 | s = lock_rtas(); |
105 | rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c); | |
f97bb36f | 106 | unlock_rtas(s); |
1da177e4 LT |
107 | } |
108 | ||
296167ae | 109 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
110 | { |
111 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
112 | static int width = 16; | |
113 | ||
114 | if (c == '\n') { | |
115 | while (width-- > 0) | |
116 | call_rtas_display_status(' '); | |
117 | width = 16; | |
21fe3301 | 118 | mdelay(500); |
1da177e4 LT |
119 | pending_newline = 1; |
120 | } else { | |
121 | if (pending_newline) { | |
122 | call_rtas_display_status('\r'); | |
123 | call_rtas_display_status('\n'); | |
124 | } | |
125 | pending_newline = 0; | |
126 | if (width--) { | |
127 | call_rtas_display_status(c); | |
128 | udelay(10000); | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
cc46bb98 | 133 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
134 | { |
135 | udbg_putc = call_rtas_display_status_delay; | |
136 | } | |
137 | ||
cc46bb98 ME |
138 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
139 | ||
140 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
141 | * work, you can hard code the token values for your firmware here and | |
142 | * hardcode rtas.base/entry etc. | |
143 | */ | |
144 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
145 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
146 | ||
147 | static void udbg_rtascon_putc(char c) | |
148 | { | |
149 | int tries; | |
150 | ||
151 | if (!rtas.base) | |
152 | return; | |
153 | ||
154 | /* Add CRs before LFs */ | |
155 | if (c == '\n') | |
156 | udbg_rtascon_putc('\r'); | |
157 | ||
158 | /* if there is more than one character to be displayed, wait a bit */ | |
159 | for (tries = 0; tries < 16; tries++) { | |
160 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
161 | break; | |
162 | udelay(1000); | |
163 | } | |
164 | } | |
165 | ||
166 | static int udbg_rtascon_getc_poll(void) | |
167 | { | |
168 | int c; | |
169 | ||
170 | if (!rtas.base) | |
171 | return -1; | |
172 | ||
173 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
174 | return -1; | |
175 | ||
176 | return c; | |
177 | } | |
178 | ||
179 | static int udbg_rtascon_getc(void) | |
180 | { | |
181 | int c; | |
182 | ||
183 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
184 | ; | |
185 | ||
186 | return c; | |
187 | } | |
188 | ||
189 | ||
190 | void __init udbg_init_rtas_console(void) | |
191 | { | |
192 | udbg_putc = udbg_rtascon_putc; | |
193 | udbg_getc = udbg_rtascon_getc; | |
194 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
195 | } | |
196 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
197 | ||
033ef338 | 198 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
199 | { |
200 | struct device_node *root; | |
a7f67bdf | 201 | int width; |
08bc1dc5 | 202 | const __be32 *p; |
6566c6f1 AB |
203 | char *os; |
204 | static int display_character, set_indicator; | |
a7f67bdf | 205 | static int display_width, display_lines, form_feed; |
c5a69d57 | 206 | static const int *row_width; |
6566c6f1 | 207 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 208 | static int current_line; |
6566c6f1 AB |
209 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
210 | ||
211 | if (!rtas.base) | |
212 | return; | |
213 | ||
8f586b22 MS |
214 | if (display_width == 0) { |
215 | display_width = 0x10; | |
8c8dc322 | 216 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 217 | if ((p = of_get_property(root, |
8f586b22 | 218 | "ibm,display-line-length", NULL))) |
08bc1dc5 | 219 | display_width = be32_to_cpu(*p); |
e2eb6392 | 220 | if ((p = of_get_property(root, |
8f586b22 | 221 | "ibm,form-feed", NULL))) |
08bc1dc5 | 222 | form_feed = be32_to_cpu(*p); |
e2eb6392 | 223 | if ((p = of_get_property(root, |
8f586b22 | 224 | "ibm,display-number-of-lines", NULL))) |
08bc1dc5 | 225 | display_lines = be32_to_cpu(*p); |
e2eb6392 | 226 | row_width = of_get_property(root, |
8f586b22 | 227 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 228 | of_node_put(root); |
8f586b22 | 229 | } |
6566c6f1 AB |
230 | display_character = rtas_token("display-character"); |
231 | set_indicator = rtas_token("set-indicator"); | |
232 | } | |
233 | ||
234 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
235 | /* use hex display if available */ | |
236 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
237 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
238 | return; | |
239 | } | |
240 | ||
241 | spin_lock(&progress_lock); | |
242 | ||
243 | /* | |
244 | * Last write ended with newline, but we didn't print it since | |
245 | * it would just clear the bottom line of output. Print it now | |
246 | * instead. | |
247 | * | |
8f586b22 MS |
248 | * If no newline is pending and form feed is supported, clear the |
249 | * display with a form feed; otherwise, print a CR to start output | |
250 | * at the beginning of the line. | |
6566c6f1 AB |
251 | */ |
252 | if (pending_newline) { | |
253 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
254 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
255 | pending_newline = 0; | |
256 | } else { | |
8f586b22 MS |
257 | current_line = 0; |
258 | if (form_feed) | |
259 | rtas_call(display_character, 1, 1, NULL, | |
260 | (char)form_feed); | |
261 | else | |
262 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
263 | } |
264 | ||
8f586b22 MS |
265 | if (row_width) |
266 | width = row_width[current_line]; | |
267 | else | |
268 | width = display_width; | |
6566c6f1 AB |
269 | os = s; |
270 | while (*os) { | |
271 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
272 | /* If newline is the last character, save it |
273 | * until next call to avoid bumping up the | |
274 | * display output. | |
275 | */ | |
276 | if (*os == '\n' && !os[1]) { | |
277 | pending_newline = 1; | |
8f586b22 MS |
278 | current_line++; |
279 | if (current_line > display_lines-1) | |
280 | current_line = display_lines-1; | |
6566c6f1 AB |
281 | spin_unlock(&progress_lock); |
282 | return; | |
283 | } | |
284 | ||
285 | /* RTAS wants CR-LF, not just LF */ | |
286 | ||
287 | if (*os == '\n') { | |
288 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
289 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
290 | } else { | |
291 | /* CR might be used to re-draw a line, so we'll | |
292 | * leave it alone and not add LF. | |
293 | */ | |
294 | rtas_call(display_character, 1, 1, NULL, *os); | |
295 | } | |
296 | ||
8f586b22 MS |
297 | if (row_width) |
298 | width = row_width[current_line]; | |
299 | else | |
300 | width = display_width; | |
6566c6f1 AB |
301 | } else { |
302 | width--; | |
303 | rtas_call(display_character, 1, 1, NULL, *os); | |
304 | } | |
305 | ||
306 | os++; | |
307 | ||
308 | /* if we overwrite the screen length */ | |
309 | if (width <= 0) | |
310 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
311 | os++; | |
312 | } | |
313 | ||
6566c6f1 AB |
314 | spin_unlock(&progress_lock); |
315 | } | |
f4fcbbe9 | 316 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 317 | |
033ef338 | 318 | int rtas_token(const char *service) |
1da177e4 | 319 | { |
08bc1dc5 | 320 | const __be32 *tokp; |
033ef338 | 321 | if (rtas.dev == NULL) |
1da177e4 | 322 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 323 | tokp = of_get_property(rtas.dev, service, NULL); |
08bc1dc5 | 324 | return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE; |
1da177e4 | 325 | } |
ab3ab74d | 326 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 327 | |
f2d6d2d8 NL |
328 | int rtas_service_present(const char *service) |
329 | { | |
330 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
331 | } | |
332 | EXPORT_SYMBOL(rtas_service_present); | |
333 | ||
033ef338 | 334 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
335 | /* |
336 | * Return the firmware-specified size of the error log buffer | |
337 | * for all rtas calls that require an error buffer argument. | |
338 | * This includes 'check-exception' and 'rtas-last-error'. | |
339 | */ | |
340 | int rtas_get_error_log_max(void) | |
341 | { | |
342 | static int rtas_error_log_max; | |
343 | if (rtas_error_log_max) | |
344 | return rtas_error_log_max; | |
345 | ||
346 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
347 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
348 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
349 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
350 | rtas_error_log_max); | |
1da177e4 LT |
351 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
352 | } | |
353 | return rtas_error_log_max; | |
354 | } | |
033ef338 | 355 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
356 | |
357 | ||
1c21a293 ME |
358 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
359 | static int rtas_last_error_token; | |
033ef338 | 360 | |
1da177e4 LT |
361 | /** Return a copy of the detailed error text associated with the |
362 | * most recent failed call to rtas. Because the error text | |
363 | * might go stale if there are any other intervening rtas calls, | |
364 | * this routine must be called atomically with whatever produced | |
365 | * the error (i.e. with rtas.lock still held from the previous call). | |
366 | */ | |
033ef338 | 367 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
368 | { |
369 | struct rtas_args err_args, save_args; | |
370 | u32 bufsz; | |
033ef338 PM |
371 | char *buf = NULL; |
372 | ||
373 | if (rtas_last_error_token == -1) | |
374 | return NULL; | |
1da177e4 LT |
375 | |
376 | bufsz = rtas_get_error_log_max(); | |
377 | ||
27128264 AB |
378 | err_args.token = cpu_to_be32(rtas_last_error_token); |
379 | err_args.nargs = cpu_to_be32(2); | |
380 | err_args.nret = cpu_to_be32(1); | |
381 | err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); | |
382 | err_args.args[1] = cpu_to_be32(bufsz); | |
1da177e4 LT |
383 | err_args.args[2] = 0; |
384 | ||
385 | save_args = rtas.args; | |
386 | rtas.args = err_args; | |
387 | ||
388 | enter_rtas(__pa(&rtas.args)); | |
389 | ||
390 | err_args = rtas.args; | |
391 | rtas.args = save_args; | |
392 | ||
033ef338 PM |
393 | /* Log the error in the unlikely case that there was one. */ |
394 | if (unlikely(err_args.args[2] == 0)) { | |
395 | if (altbuf) { | |
396 | buf = altbuf; | |
397 | } else { | |
398 | buf = rtas_err_buf; | |
f691fa10 | 399 | if (slab_is_available()) |
033ef338 PM |
400 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); |
401 | } | |
402 | if (buf) | |
403 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
404 | } | |
405 | ||
406 | return buf; | |
1da177e4 LT |
407 | } |
408 | ||
033ef338 PM |
409 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
410 | ||
411 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
412 | #define __fetch_rtas_last_error(x) NULL | |
413 | #define get_errorlog_buffer() NULL | |
414 | #endif | |
415 | ||
209eb4e5 ME |
416 | |
417 | static void | |
418 | va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, | |
419 | va_list list) | |
420 | { | |
421 | int i; | |
422 | ||
423 | args->token = cpu_to_be32(token); | |
424 | args->nargs = cpu_to_be32(nargs); | |
425 | args->nret = cpu_to_be32(nret); | |
426 | args->rets = &(args->args[nargs]); | |
427 | ||
428 | for (i = 0; i < nargs; ++i) | |
429 | args->args[i] = cpu_to_be32(va_arg(list, __u32)); | |
430 | ||
431 | for (i = 0; i < nret; ++i) | |
432 | args->rets[i] = 0; | |
433 | ||
434 | enter_rtas(__pa(args)); | |
435 | } | |
436 | ||
437 | void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...) | |
438 | { | |
439 | va_list list; | |
440 | ||
441 | va_start(list, nret); | |
442 | va_rtas_call_unlocked(args, token, nargs, nret, list); | |
443 | va_end(list); | |
444 | } | |
445 | ||
1da177e4 LT |
446 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
447 | { | |
448 | va_list list; | |
033ef338 | 449 | int i; |
1da177e4 LT |
450 | unsigned long s; |
451 | struct rtas_args *rtas_args; | |
033ef338 | 452 | char *buff_copy = NULL; |
1da177e4 LT |
453 | int ret; |
454 | ||
24da3dd5 | 455 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
456 | return -1; |
457 | ||
f97bb36f | 458 | s = lock_rtas(); |
209eb4e5 ME |
459 | |
460 | /* We use the global rtas args buffer */ | |
1da177e4 LT |
461 | rtas_args = &rtas.args; |
462 | ||
1da177e4 | 463 | va_start(list, outputs); |
209eb4e5 | 464 | va_rtas_call_unlocked(rtas_args, token, nargs, nret, list); |
1da177e4 LT |
465 | va_end(list); |
466 | ||
1da177e4 LT |
467 | /* A -1 return code indicates that the last command couldn't |
468 | be completed due to a hardware error. */ | |
27128264 | 469 | if (be32_to_cpu(rtas_args->rets[0]) == -1) |
033ef338 | 470 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
471 | |
472 | if (nret > 1 && outputs != NULL) | |
473 | for (i = 0; i < nret-1; ++i) | |
27128264 AB |
474 | outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); |
475 | ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; | |
1da177e4 | 476 | |
f97bb36f | 477 | unlock_rtas(s); |
1da177e4 LT |
478 | |
479 | if (buff_copy) { | |
480 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
f691fa10 | 481 | if (slab_is_available()) |
1da177e4 LT |
482 | kfree(buff_copy); |
483 | } | |
484 | return ret; | |
485 | } | |
ab3ab74d | 486 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 487 | |
507279db JR |
488 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
489 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 490 | */ |
507279db | 491 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 492 | { |
507279db JR |
493 | int order; |
494 | unsigned int ms = 0; | |
495 | ||
496 | if (status == RTAS_BUSY) { | |
497 | ms = 1; | |
9ef03193 TH |
498 | } else if (status >= RTAS_EXTENDED_DELAY_MIN && |
499 | status <= RTAS_EXTENDED_DELAY_MAX) { | |
500 | order = status - RTAS_EXTENDED_DELAY_MIN; | |
507279db JR |
501 | for (ms = 1; order > 0; order--) |
502 | ms *= 10; | |
503 | } | |
1da177e4 | 504 | |
507279db JR |
505 | return ms; |
506 | } | |
ab3ab74d | 507 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 508 | |
507279db JR |
509 | /* For an RTAS busy status code, perform the hinted delay. */ |
510 | unsigned int rtas_busy_delay(int status) | |
511 | { | |
512 | unsigned int ms; | |
1da177e4 | 513 | |
507279db JR |
514 | might_sleep(); |
515 | ms = rtas_busy_delay_time(status); | |
eca590f4 | 516 | if (ms && need_resched()) |
507279db JR |
517 | msleep(ms); |
518 | ||
519 | return ms; | |
1da177e4 | 520 | } |
ab3ab74d | 521 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 522 | |
1c21a293 | 523 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
524 | { |
525 | int rc; | |
526 | ||
527 | switch (rtas_rc) { | |
528 | case -1: /* Hardware Error */ | |
529 | rc = -EIO; | |
530 | break; | |
531 | case -3: /* Bad indicator/domain/etc */ | |
532 | rc = -EINVAL; | |
533 | break; | |
534 | case -9000: /* Isolation error */ | |
535 | rc = -EFAULT; | |
536 | break; | |
537 | case -9001: /* Outstanding TCE/PTE */ | |
538 | rc = -EEXIST; | |
539 | break; | |
540 | case -9002: /* No usable slot */ | |
541 | rc = -ENODEV; | |
542 | break; | |
543 | default: | |
544 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 545 | __func__, rtas_rc); |
1da177e4 LT |
546 | rc = -ERANGE; |
547 | break; | |
548 | } | |
549 | return rc; | |
550 | } | |
551 | ||
552 | int rtas_get_power_level(int powerdomain, int *level) | |
553 | { | |
554 | int token = rtas_token("get-power-level"); | |
555 | int rc; | |
556 | ||
557 | if (token == RTAS_UNKNOWN_SERVICE) | |
558 | return -ENOENT; | |
559 | ||
560 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
561 | udelay(1); | |
562 | ||
563 | if (rc < 0) | |
564 | return rtas_error_rc(rc); | |
565 | return rc; | |
566 | } | |
ab3ab74d | 567 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
568 | |
569 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
570 | { | |
571 | int token = rtas_token("set-power-level"); | |
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, setlevel, powerdomain, level); |
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_set_power_level); |
1da177e4 LT |
586 | |
587 | int rtas_get_sensor(int sensor, int index, int *state) | |
588 | { | |
589 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
590 | int rc; |
591 | ||
592 | if (token == RTAS_UNKNOWN_SERVICE) | |
593 | return -ENOENT; | |
594 | ||
507279db | 595 | do { |
1da177e4 | 596 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 597 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
598 | |
599 | if (rc < 0) | |
600 | return rtas_error_rc(rc); | |
601 | return rc; | |
602 | } | |
ab3ab74d | 603 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 | 604 | |
1c2cb594 TH |
605 | int rtas_get_sensor_fast(int sensor, int index, int *state) |
606 | { | |
607 | int token = rtas_token("get-sensor-state"); | |
608 | int rc; | |
609 | ||
610 | if (token == RTAS_UNKNOWN_SERVICE) | |
611 | return -ENOENT; | |
612 | ||
613 | rc = rtas_call(token, 2, 2, state, sensor, index); | |
614 | WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && | |
615 | rc <= RTAS_EXTENDED_DELAY_MAX)); | |
616 | ||
617 | if (rc < 0) | |
618 | return rtas_error_rc(rc); | |
619 | return rc; | |
620 | } | |
621 | ||
edc72ac4 NL |
622 | bool rtas_indicator_present(int token, int *maxindex) |
623 | { | |
624 | int proplen, count, i; | |
625 | const struct indicator_elem { | |
08bc1dc5 AB |
626 | __be32 token; |
627 | __be32 maxindex; | |
edc72ac4 NL |
628 | } *indicators; |
629 | ||
630 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); | |
631 | if (!indicators) | |
632 | return false; | |
633 | ||
634 | count = proplen / sizeof(struct indicator_elem); | |
635 | ||
636 | for (i = 0; i < count; i++) { | |
08bc1dc5 | 637 | if (__be32_to_cpu(indicators[i].token) != token) |
edc72ac4 NL |
638 | continue; |
639 | if (maxindex) | |
08bc1dc5 | 640 | *maxindex = __be32_to_cpu(indicators[i].maxindex); |
edc72ac4 NL |
641 | return true; |
642 | } | |
643 | ||
644 | return false; | |
645 | } | |
646 | EXPORT_SYMBOL(rtas_indicator_present); | |
647 | ||
1da177e4 LT |
648 | int rtas_set_indicator(int indicator, int index, int new_value) |
649 | { | |
650 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
651 | int rc; |
652 | ||
653 | if (token == RTAS_UNKNOWN_SERVICE) | |
654 | return -ENOENT; | |
655 | ||
507279db | 656 | do { |
1da177e4 | 657 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 658 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
659 | |
660 | if (rc < 0) | |
661 | return rtas_error_rc(rc); | |
662 | return rc; | |
663 | } | |
ab3ab74d | 664 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 665 | |
81b73dd9 HM |
666 | /* |
667 | * Ignoring RTAS extended delay | |
668 | */ | |
669 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
670 | { | |
671 | int rc; | |
672 | int token = rtas_token("set-indicator"); | |
673 | ||
674 | if (token == RTAS_UNKNOWN_SERVICE) | |
675 | return -ENOENT; | |
676 | ||
677 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
678 | ||
9ef03193 TH |
679 | WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && |
680 | rc <= RTAS_EXTENDED_DELAY_MAX)); | |
81b73dd9 HM |
681 | |
682 | if (rc < 0) | |
683 | return rtas_error_rc(rc); | |
684 | ||
685 | return rc; | |
686 | } | |
687 | ||
95ec77c0 | 688 | void __noreturn rtas_restart(char *cmd) |
1da177e4 | 689 | { |
f4fcbbe9 PM |
690 | if (rtas_flash_term_hook) |
691 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
692 | printk("RTAS system-reboot returned %d\n", |
693 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
694 | for (;;); | |
695 | } | |
696 | ||
033ef338 | 697 | void rtas_power_off(void) |
1da177e4 | 698 | { |
f4fcbbe9 PM |
699 | if (rtas_flash_term_hook) |
700 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
701 | /* allow power on only with power button press */ |
702 | printk("RTAS power-off returned %d\n", | |
703 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
704 | for (;;); | |
705 | } | |
706 | ||
95ec77c0 | 707 | void __noreturn rtas_halt(void) |
1da177e4 | 708 | { |
f4fcbbe9 PM |
709 | if (rtas_flash_term_hook) |
710 | rtas_flash_term_hook(SYS_HALT); | |
711 | /* allow power on only with power button press */ | |
712 | printk("RTAS power-off returned %d\n", | |
713 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
714 | for (;;); | |
1da177e4 LT |
715 | } |
716 | ||
717 | /* Must be in the RMO region, so we place it here */ | |
718 | static char rtas_os_term_buf[2048]; | |
719 | ||
8f515061 | 720 | void rtas_os_term(char *str) |
a2b51812 LV |
721 | { |
722 | int status; | |
39ed2fe6 | 723 | |
e9bbc8cd AB |
724 | /* |
725 | * Firmware with the ibm,extended-os-term property is guaranteed | |
726 | * to always return from an ibm,os-term call. Earlier versions without | |
727 | * this property may terminate the partition which we want to avoid | |
728 | * since it interferes with panic_timeout. | |
729 | */ | |
730 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || | |
731 | RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) | |
1da177e4 LT |
732 | return; |
733 | ||
8f515061 PM |
734 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
735 | ||
1da177e4 LT |
736 | do { |
737 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
738 | __pa(rtas_os_term_buf)); | |
507279db | 739 | } while (rtas_busy_delay(status)); |
1da177e4 | 740 | |
507279db | 741 | if (status != 0) |
e9bbc8cd | 742 | printk(KERN_EMERG "ibm,os-term call failed %d\n", status); |
1da177e4 LT |
743 | } |
744 | ||
91dc182c DB |
745 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
746 | #ifdef CONFIG_PPC_PSERIES | |
8fe93f8d BK |
747 | static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
748 | { | |
749 | u16 slb_size = mmu_slb_size; | |
750 | int rc = H_MULTI_THREADS_ACTIVE; | |
751 | int cpu; | |
752 | ||
753 | slb_set_size(SLB_MIN_SIZE); | |
754 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); | |
755 | ||
756 | while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && | |
757 | !atomic_read(&data->error)) | |
758 | rc = rtas_call(data->token, 0, 1, NULL); | |
759 | ||
760 | if (rc || atomic_read(&data->error)) { | |
761 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); | |
762 | slb_set_size(slb_size); | |
763 | } | |
764 | ||
765 | if (atomic_read(&data->error)) | |
766 | rc = atomic_read(&data->error); | |
767 | ||
768 | atomic_set(&data->error, rc); | |
9ee820fa | 769 | pSeries_coalesce_init(); |
8fe93f8d BK |
770 | |
771 | if (wake_when_done) { | |
772 | atomic_set(&data->done, 1); | |
773 | ||
774 | for_each_online_cpu(cpu) | |
775 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
776 | } | |
777 | ||
778 | if (atomic_dec_return(&data->working) == 0) | |
779 | complete(data->complete); | |
780 | ||
781 | return rc; | |
782 | } | |
783 | ||
784 | int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) | |
785 | { | |
786 | atomic_inc(&data->working); | |
787 | return __rtas_suspend_last_cpu(data, 0); | |
788 | } | |
789 | ||
790 | static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) | |
91dc182c | 791 | { |
f52862f4 | 792 | long rc = H_SUCCESS; |
8f5c7579 NL |
793 | unsigned long msr_save; |
794 | int cpu; | |
91dc182c | 795 | |
8f5c7579 NL |
796 | atomic_inc(&data->working); |
797 | ||
798 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
799 | msr_save = mfmsr(); | |
800 | mtmsr(msr_save & ~(MSR_EE)); | |
801 | ||
8fe93f8d | 802 | while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) |
f52862f4 | 803 | rc = plpar_hcall_norets(H_JOIN); |
8f5c7579 NL |
804 | |
805 | mtmsr(msr_save); | |
91dc182c | 806 | |
8f5c7579 NL |
807 | if (rc == H_SUCCESS) { |
808 | /* This cpu was prodded and the suspend is complete. */ | |
809 | goto out; | |
810 | } else if (rc == H_CONTINUE) { | |
811 | /* All other cpus are in H_JOIN, this cpu does | |
812 | * the suspend. | |
813 | */ | |
8fe93f8d | 814 | return __rtas_suspend_last_cpu(data, wake_when_done); |
91dc182c | 815 | } else { |
8f5c7579 NL |
816 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
817 | smp_processor_id(), rc); | |
8fe93f8d | 818 | atomic_set(&data->error, rc); |
91dc182c | 819 | } |
f52862f4 | 820 | |
8fe93f8d BK |
821 | if (wake_when_done) { |
822 | atomic_set(&data->done, 1); | |
f52862f4 | 823 | |
8fe93f8d BK |
824 | /* This cpu did the suspend or got an error; in either case, |
825 | * we need to prod all other other cpus out of join state. | |
826 | * Extra prods are harmless. | |
827 | */ | |
828 | for_each_online_cpu(cpu) | |
829 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
830 | } | |
91dc182c | 831 | out: |
8f5c7579 NL |
832 | if (atomic_dec_return(&data->working) == 0) |
833 | complete(data->complete); | |
8fe93f8d BK |
834 | return rc; |
835 | } | |
836 | ||
837 | int rtas_suspend_cpu(struct rtas_suspend_me_data *data) | |
838 | { | |
839 | return __rtas_suspend_cpu(data, 0); | |
840 | } | |
841 | ||
842 | static void rtas_percpu_suspend_me(void *info) | |
843 | { | |
844 | __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); | |
91dc182c DB |
845 | } |
846 | ||
120496ac RJ |
847 | enum rtas_cpu_state { |
848 | DOWN, | |
849 | UP, | |
850 | }; | |
851 | ||
852 | #ifndef CONFIG_SMP | |
853 | static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, | |
854 | cpumask_var_t cpus) | |
855 | { | |
856 | if (!cpumask_empty(cpus)) { | |
857 | cpumask_clear(cpus); | |
858 | return -EINVAL; | |
859 | } else | |
860 | return 0; | |
861 | } | |
862 | #else | |
863 | /* On return cpumask will be altered to indicate CPUs changed. | |
864 | * CPUs with states changed will be set in the mask, | |
865 | * CPUs with status unchanged will be unset in the mask. */ | |
866 | static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, | |
867 | cpumask_var_t cpus) | |
868 | { | |
869 | int cpu; | |
870 | int cpuret = 0; | |
871 | int ret = 0; | |
872 | ||
873 | if (cpumask_empty(cpus)) | |
874 | return 0; | |
875 | ||
876 | for_each_cpu(cpu, cpus) { | |
877 | switch (state) { | |
878 | case DOWN: | |
879 | cpuret = cpu_down(cpu); | |
880 | break; | |
881 | case UP: | |
882 | cpuret = cpu_up(cpu); | |
883 | break; | |
884 | } | |
885 | if (cpuret) { | |
886 | pr_debug("%s: cpu_%s for cpu#%d returned %d.\n", | |
887 | __func__, | |
888 | ((state == UP) ? "up" : "down"), | |
889 | cpu, cpuret); | |
890 | if (!ret) | |
891 | ret = cpuret; | |
892 | if (state == UP) { | |
893 | /* clear bits for unchanged cpus, return */ | |
894 | cpumask_shift_right(cpus, cpus, cpu); | |
895 | cpumask_shift_left(cpus, cpus, cpu); | |
896 | break; | |
897 | } else { | |
898 | /* clear bit for unchanged cpu, continue */ | |
899 | cpumask_clear_cpu(cpu, cpus); | |
900 | } | |
901 | } | |
902 | } | |
903 | ||
904 | return ret; | |
905 | } | |
906 | #endif | |
907 | ||
908 | int rtas_online_cpus_mask(cpumask_var_t cpus) | |
909 | { | |
910 | int ret; | |
911 | ||
912 | ret = rtas_cpu_state_change_mask(UP, cpus); | |
913 | ||
914 | if (ret) { | |
915 | cpumask_var_t tmp_mask; | |
916 | ||
917 | if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY)) | |
918 | return ret; | |
919 | ||
920 | /* Use tmp_mask to preserve cpus mask from first failure */ | |
921 | cpumask_copy(tmp_mask, cpus); | |
922 | rtas_offline_cpus_mask(tmp_mask); | |
923 | free_cpumask_var(tmp_mask); | |
924 | } | |
925 | ||
926 | return ret; | |
927 | } | |
928 | EXPORT_SYMBOL(rtas_online_cpus_mask); | |
929 | ||
930 | int rtas_offline_cpus_mask(cpumask_var_t cpus) | |
931 | { | |
932 | return rtas_cpu_state_change_mask(DOWN, cpus); | |
933 | } | |
934 | EXPORT_SYMBOL(rtas_offline_cpus_mask); | |
935 | ||
c03e7374 | 936 | int rtas_ibm_suspend_me(u64 handle) |
91dc182c | 937 | { |
368a6ba5 DB |
938 | long state; |
939 | long rc; | |
b9377ffc | 940 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 941 | struct rtas_suspend_me_data data; |
8f5c7579 | 942 | DECLARE_COMPLETION_ONSTACK(done); |
120496ac RJ |
943 | cpumask_var_t offline_mask; |
944 | int cpuret; | |
8f5c7579 NL |
945 | |
946 | if (!rtas_service_present("ibm,suspend-me")) | |
947 | return -ENOSYS; | |
91dc182c | 948 | |
368a6ba5 | 949 | /* Make sure the state is valid */ |
3df76a9d | 950 | rc = plpar_hcall(H_VASI_STATE, retbuf, handle); |
b9377ffc AB |
951 | |
952 | state = retbuf[0]; | |
368a6ba5 DB |
953 | |
954 | if (rc) { | |
955 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
956 | return rc; | |
957 | } else if (state == H_VASI_ENABLED) { | |
c03e7374 | 958 | return -EAGAIN; |
368a6ba5 DB |
959 | } else if (state != H_VASI_SUSPENDING) { |
960 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
961 | state); | |
c03e7374 | 962 | return -EIO; |
368a6ba5 DB |
963 | } |
964 | ||
120496ac RJ |
965 | if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY)) |
966 | return -ENOMEM; | |
967 | ||
8f5c7579 | 968 | atomic_set(&data.working, 0); |
f52862f4 | 969 | atomic_set(&data.done, 0); |
8fe93f8d | 970 | atomic_set(&data.error, 0); |
8f5c7579 | 971 | data.token = rtas_token("ibm,suspend-me"); |
8f5c7579 | 972 | data.complete = &done; |
120496ac RJ |
973 | |
974 | /* All present CPUs must be online */ | |
975 | cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask); | |
976 | cpuret = rtas_online_cpus_mask(offline_mask); | |
977 | if (cpuret) { | |
978 | pr_err("%s: Could not bring present CPUs online.\n", __func__); | |
979 | atomic_set(&data.error, cpuret); | |
980 | goto out; | |
981 | } | |
982 | ||
444080d1 | 983 | stop_topology_update(); |
91dc182c DB |
984 | |
985 | /* Call function on all CPUs. One of us will make the | |
986 | * rtas call | |
987 | */ | |
15c8b6c1 | 988 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8fe93f8d | 989 | atomic_set(&data.error, -EINVAL); |
91dc182c | 990 | |
8f5c7579 | 991 | wait_for_completion(&done); |
91dc182c | 992 | |
8fe93f8d | 993 | if (atomic_read(&data.error) != 0) |
8f5c7579 | 994 | printk(KERN_ERR "Error doing global join\n"); |
91dc182c | 995 | |
444080d1 BK |
996 | start_topology_update(); |
997 | ||
120496ac RJ |
998 | /* Take down CPUs not online prior to suspend */ |
999 | cpuret = rtas_offline_cpus_mask(offline_mask); | |
1000 | if (cpuret) | |
1001 | pr_warn("%s: Could not restore CPUs to offline state.\n", | |
1002 | __func__); | |
1003 | ||
1004 | out: | |
1005 | free_cpumask_var(offline_mask); | |
8fe93f8d | 1006 | return atomic_read(&data.error); |
91dc182c DB |
1007 | } |
1008 | #else /* CONFIG_PPC_PSERIES */ | |
c03e7374 | 1009 | int rtas_ibm_suspend_me(u64 handle) |
91dc182c DB |
1010 | { |
1011 | return -ENOSYS; | |
1012 | } | |
1013 | #endif | |
1da177e4 | 1014 | |
6431f208 AB |
1015 | /** |
1016 | * Find a specific pseries error log in an RTAS extended event log. | |
1017 | * @log: RTAS error/event log | |
1018 | * @section_id: two character section identifier | |
1019 | * | |
1020 | * Returns a pointer to the specified errorlog or NULL if not found. | |
1021 | */ | |
1022 | struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, | |
1023 | uint16_t section_id) | |
1024 | { | |
1025 | struct rtas_ext_event_log_v6 *ext_log = | |
1026 | (struct rtas_ext_event_log_v6 *)log->buffer; | |
1027 | struct pseries_errorlog *sect; | |
1028 | unsigned char *p, *log_end; | |
a08a53ea GK |
1029 | uint32_t ext_log_length = rtas_error_extended_log_length(log); |
1030 | uint8_t log_format = rtas_ext_event_log_format(ext_log); | |
1031 | uint32_t company_id = rtas_ext_event_company_id(ext_log); | |
6431f208 AB |
1032 | |
1033 | /* Check that we understand the format */ | |
a08a53ea GK |
1034 | if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) || |
1035 | log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || | |
1036 | company_id != RTAS_V6EXT_COMPANY_ID_IBM) | |
6431f208 AB |
1037 | return NULL; |
1038 | ||
a08a53ea | 1039 | log_end = log->buffer + ext_log_length; |
6431f208 AB |
1040 | p = ext_log->vendor_log; |
1041 | ||
1042 | while (p < log_end) { | |
1043 | sect = (struct pseries_errorlog *)p; | |
a08a53ea | 1044 | if (pseries_errorlog_id(sect) == section_id) |
6431f208 | 1045 | return sect; |
a08a53ea | 1046 | p += pseries_errorlog_length(sect); |
6431f208 AB |
1047 | } |
1048 | ||
1049 | return NULL; | |
1050 | } | |
1051 | ||
599d2870 | 1052 | /* We assume to be passed big endian arguments */ |
1da177e4 LT |
1053 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) |
1054 | { | |
1055 | struct rtas_args args; | |
1056 | unsigned long flags; | |
033ef338 | 1057 | char *buff_copy, *errbuf = NULL; |
599d2870 | 1058 | int nargs, nret, token; |
1da177e4 LT |
1059 | |
1060 | if (!capable(CAP_SYS_ADMIN)) | |
1061 | return -EPERM; | |
1062 | ||
8832317f VH |
1063 | if (!rtas.entry) |
1064 | return -EINVAL; | |
1065 | ||
1da177e4 LT |
1066 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) |
1067 | return -EFAULT; | |
1068 | ||
599d2870 GK |
1069 | nargs = be32_to_cpu(args.nargs); |
1070 | nret = be32_to_cpu(args.nret); | |
1071 | token = be32_to_cpu(args.token); | |
1072 | ||
a9862c74 | 1073 | if (nargs >= ARRAY_SIZE(args.args) |
599d2870 GK |
1074 | || nret > ARRAY_SIZE(args.args) |
1075 | || nargs + nret > ARRAY_SIZE(args.args)) | |
1da177e4 LT |
1076 | return -EINVAL; |
1077 | ||
1078 | /* Copy in args. */ | |
1079 | if (copy_from_user(args.args, uargs->args, | |
1080 | nargs * sizeof(rtas_arg_t)) != 0) | |
1081 | return -EFAULT; | |
1082 | ||
599d2870 | 1083 | if (token == RTAS_UNKNOWN_SERVICE) |
91dc182c DB |
1084 | return -EINVAL; |
1085 | ||
b79998fc | 1086 | args.rets = &args.args[nargs]; |
599d2870 | 1087 | memset(args.rets, 0, nret * sizeof(rtas_arg_t)); |
b79998fc | 1088 | |
91dc182c | 1089 | /* Need to handle ibm,suspend_me call specially */ |
599d2870 | 1090 | if (token == ibm_suspend_me_token) { |
3df76a9d CB |
1091 | |
1092 | /* | |
c03e7374 TD |
1093 | * rtas_ibm_suspend_me assumes the streamid handle is in cpu |
1094 | * endian, or at least the hcall within it requires it. | |
3df76a9d | 1095 | */ |
c03e7374 | 1096 | int rc = 0; |
3df76a9d CB |
1097 | u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32) |
1098 | | be32_to_cpu(args.args[1]); | |
c03e7374 TD |
1099 | rc = rtas_ibm_suspend_me(handle); |
1100 | if (rc == -EAGAIN) | |
1101 | args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE); | |
1102 | else if (rc == -EIO) | |
1103 | args.rets[0] = cpu_to_be32(-1); | |
1104 | else if (rc) | |
91dc182c DB |
1105 | return rc; |
1106 | goto copy_return; | |
1107 | } | |
1108 | ||
033ef338 | 1109 | buff_copy = get_errorlog_buffer(); |
1da177e4 | 1110 | |
f97bb36f | 1111 | flags = lock_rtas(); |
1da177e4 LT |
1112 | |
1113 | rtas.args = args; | |
1114 | enter_rtas(__pa(&rtas.args)); | |
1115 | args = rtas.args; | |
1116 | ||
1da177e4 LT |
1117 | /* A -1 return code indicates that the last command couldn't |
1118 | be completed due to a hardware error. */ | |
599d2870 | 1119 | if (be32_to_cpu(args.rets[0]) == -1) |
033ef338 | 1120 | errbuf = __fetch_rtas_last_error(buff_copy); |
1da177e4 | 1121 | |
f97bb36f | 1122 | unlock_rtas(flags); |
1da177e4 LT |
1123 | |
1124 | if (buff_copy) { | |
033ef338 PM |
1125 | if (errbuf) |
1126 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
1127 | kfree(buff_copy); |
1128 | } | |
1129 | ||
91dc182c | 1130 | copy_return: |
1da177e4 LT |
1131 | /* Copy out args. */ |
1132 | if (copy_to_user(uargs->args + nargs, | |
1133 | args.args + nargs, | |
599d2870 | 1134 | nret * sizeof(rtas_arg_t)) != 0) |
1da177e4 LT |
1135 | return -EFAULT; |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1da177e4 | 1140 | /* |
14ed7409 AB |
1141 | * Call early during boot, before mem init, to retrieve the RTAS |
1142 | * information from the device-tree and allocate the RMO buffer for userland | |
1da177e4 LT |
1143 | * accesses. |
1144 | */ | |
1145 | void __init rtas_initialize(void) | |
1146 | { | |
033ef338 PM |
1147 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
1148 | ||
1da177e4 LT |
1149 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
1150 | * about it. | |
1151 | */ | |
1152 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
1153 | if (rtas.dev) { | |
08bc1dc5 | 1154 | const __be32 *basep, *entryp, *sizep; |
1da177e4 | 1155 | |
e2eb6392 SR |
1156 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
1157 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); | |
1da177e4 | 1158 | if (basep != NULL && sizep != NULL) { |
08bc1dc5 AB |
1159 | rtas.base = __be32_to_cpu(*basep); |
1160 | rtas.size = __be32_to_cpu(*sizep); | |
e2eb6392 | 1161 | entryp = of_get_property(rtas.dev, |
a7f67bdf | 1162 | "linux,rtas-entry", NULL); |
1da177e4 LT |
1163 | if (entryp == NULL) /* Ugh */ |
1164 | rtas.entry = rtas.base; | |
1165 | else | |
08bc1dc5 | 1166 | rtas.entry = __be32_to_cpu(*entryp); |
1da177e4 LT |
1167 | } else |
1168 | rtas.dev = NULL; | |
1169 | } | |
033ef338 PM |
1170 | if (!rtas.dev) |
1171 | return; | |
1172 | ||
1da177e4 LT |
1173 | /* If RTAS was found, allocate the RMO buffer for it and look for |
1174 | * the stop-self token if any | |
1175 | */ | |
033ef338 | 1176 | #ifdef CONFIG_PPC64 |
484cc1ed | 1177 | if (firmware_has_feature(FW_FEATURE_LPAR)) { |
cd3db0c4 | 1178 | rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
1179 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
1180 | } | |
033ef338 | 1181 | #endif |
95f72d1e | 1182 | rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); |
1da177e4 | 1183 | |
033ef338 PM |
1184 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1185 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
1186 | #endif | |
1da177e4 | 1187 | } |
458148c0 ME |
1188 | |
1189 | int __init early_init_dt_scan_rtas(unsigned long node, | |
1190 | const char *uname, int depth, void *data) | |
1191 | { | |
9d0c4dfe | 1192 | const u32 *basep, *entryp, *sizep; |
458148c0 ME |
1193 | |
1194 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
1195 | return 0; | |
1196 | ||
1197 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
1198 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
1199 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
1200 | ||
1201 | if (basep && entryp && sizep) { | |
1202 | rtas.base = *basep; | |
1203 | rtas.entry = *entryp; | |
1204 | rtas.size = *sizep; | |
1205 | } | |
1206 | ||
cc46bb98 ME |
1207 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
1208 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
1209 | if (basep) | |
1210 | rtas_putchar_token = *basep; | |
1211 | ||
1212 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
1213 | if (basep) | |
1214 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
1215 | |
1216 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
1217 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
1218 | udbg_init_rtas_console(); | |
1219 | ||
cc46bb98 ME |
1220 | #endif |
1221 | ||
458148c0 ME |
1222 | /* break now */ |
1223 | return 1; | |
1224 | } | |
c4007a2f | 1225 | |
445c8951 | 1226 | static arch_spinlock_t timebase_lock; |
c4007a2f BH |
1227 | static u64 timebase = 0; |
1228 | ||
061d19f2 | 1229 | void rtas_give_timebase(void) |
c4007a2f BH |
1230 | { |
1231 | unsigned long flags; | |
1232 | ||
1233 | local_irq_save(flags); | |
1234 | hard_irq_disable(); | |
0199c4e6 | 1235 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1236 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); |
1237 | timebase = get_tb(); | |
0199c4e6 | 1238 | arch_spin_unlock(&timebase_lock); |
c4007a2f BH |
1239 | |
1240 | while (timebase) | |
1241 | barrier(); | |
1242 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
1243 | local_irq_restore(flags); | |
1244 | } | |
1245 | ||
061d19f2 | 1246 | void rtas_take_timebase(void) |
c4007a2f BH |
1247 | { |
1248 | while (!timebase) | |
1249 | barrier(); | |
0199c4e6 | 1250 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1251 | set_tb(timebase >> 32, timebase & 0xffffffff); |
1252 | timebase = 0; | |
0199c4e6 | 1253 | arch_spin_unlock(&timebase_lock); |
c4007a2f | 1254 | } |