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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * | |
4 | * Procedures for interfacing to the RTAS on CHRP machines. | |
5 | * | |
6 | * Peter Bergner, IBM March 2001. | |
7 | * Copyright (C) 2001 IBM. | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <stdarg.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/spinlock.h> | |
4b16f8e2 | 14 | #include <linux/export.h> |
1da177e4 | 15 | #include <linux/init.h> |
a9415644 | 16 | #include <linux/capability.h> |
21fe3301 | 17 | #include <linux/delay.h> |
120496ac | 18 | #include <linux/cpu.h> |
8f5c7579 NL |
19 | #include <linux/smp.h> |
20 | #include <linux/completion.h> | |
21 | #include <linux/cpumask.h> | |
95f72d1e | 22 | #include <linux/memblock.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
c5f41752 | 24 | #include <linux/reboot.h> |
4c392e65 | 25 | #include <linux/syscalls.h> |
1da177e4 LT |
26 | |
27 | #include <asm/prom.h> | |
28 | #include <asm/rtas.h> | |
31a7f67e | 29 | #include <asm/hvcall.h> |
1da177e4 | 30 | #include <asm/machdep.h> |
e8222502 | 31 | #include <asm/firmware.h> |
1da177e4 LT |
32 | #include <asm/page.h> |
33 | #include <asm/param.h> | |
1da177e4 | 34 | #include <asm/delay.h> |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
296167ae | 36 | #include <asm/udbg.h> |
a7f31841 | 37 | #include <asm/syscalls.h> |
8f5c7579 | 38 | #include <asm/smp.h> |
60063497 | 39 | #include <linux/atomic.h> |
c4007a2f | 40 | #include <asm/time.h> |
46db2f86 | 41 | #include <asm/mmu.h> |
3b7a27db | 42 | #include <asm/topology.h> |
1da177e4 | 43 | |
cd5cdeb6 ME |
44 | /* This is here deliberately so it's only used in this file */ |
45 | void enter_rtas(unsigned long); | |
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(); | |
58788a9b | 78 | arch_spin_lock(&rtas.lock); |
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 | 95 | { |
1da177e4 LT |
96 | unsigned long s; |
97 | ||
98 | if (!rtas.base) | |
99 | return; | |
1da177e4 | 100 | |
4456f452 ME |
101 | s = lock_rtas(); |
102 | rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c); | |
f97bb36f | 103 | unlock_rtas(s); |
1da177e4 LT |
104 | } |
105 | ||
296167ae | 106 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
107 | { |
108 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
109 | static int width = 16; | |
110 | ||
111 | if (c == '\n') { | |
112 | while (width-- > 0) | |
113 | call_rtas_display_status(' '); | |
114 | width = 16; | |
21fe3301 | 115 | mdelay(500); |
1da177e4 LT |
116 | pending_newline = 1; |
117 | } else { | |
118 | if (pending_newline) { | |
119 | call_rtas_display_status('\r'); | |
120 | call_rtas_display_status('\n'); | |
121 | } | |
122 | pending_newline = 0; | |
123 | if (width--) { | |
124 | call_rtas_display_status(c); | |
125 | udelay(10000); | |
126 | } | |
127 | } | |
128 | } | |
129 | ||
cc46bb98 | 130 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
131 | { |
132 | udbg_putc = call_rtas_display_status_delay; | |
133 | } | |
134 | ||
cc46bb98 ME |
135 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
136 | ||
137 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
138 | * work, you can hard code the token values for your firmware here and | |
139 | * hardcode rtas.base/entry etc. | |
140 | */ | |
141 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
142 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
143 | ||
144 | static void udbg_rtascon_putc(char c) | |
145 | { | |
146 | int tries; | |
147 | ||
148 | if (!rtas.base) | |
149 | return; | |
150 | ||
151 | /* Add CRs before LFs */ | |
152 | if (c == '\n') | |
153 | udbg_rtascon_putc('\r'); | |
154 | ||
155 | /* if there is more than one character to be displayed, wait a bit */ | |
156 | for (tries = 0; tries < 16; tries++) { | |
157 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
158 | break; | |
159 | udelay(1000); | |
160 | } | |
161 | } | |
162 | ||
163 | static int udbg_rtascon_getc_poll(void) | |
164 | { | |
165 | int c; | |
166 | ||
167 | if (!rtas.base) | |
168 | return -1; | |
169 | ||
170 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
171 | return -1; | |
172 | ||
173 | return c; | |
174 | } | |
175 | ||
176 | static int udbg_rtascon_getc(void) | |
177 | { | |
178 | int c; | |
179 | ||
180 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
181 | ; | |
182 | ||
183 | return c; | |
184 | } | |
185 | ||
186 | ||
187 | void __init udbg_init_rtas_console(void) | |
188 | { | |
189 | udbg_putc = udbg_rtascon_putc; | |
190 | udbg_getc = udbg_rtascon_getc; | |
191 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
192 | } | |
193 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
194 | ||
033ef338 | 195 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
196 | { |
197 | struct device_node *root; | |
a7f67bdf | 198 | int width; |
08bc1dc5 | 199 | const __be32 *p; |
6566c6f1 AB |
200 | char *os; |
201 | static int display_character, set_indicator; | |
a7f67bdf | 202 | static int display_width, display_lines, form_feed; |
c5a69d57 | 203 | static const int *row_width; |
6566c6f1 | 204 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 205 | static int current_line; |
6566c6f1 AB |
206 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
207 | ||
208 | if (!rtas.base) | |
209 | return; | |
210 | ||
8f586b22 MS |
211 | if (display_width == 0) { |
212 | display_width = 0x10; | |
8c8dc322 | 213 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 214 | if ((p = of_get_property(root, |
8f586b22 | 215 | "ibm,display-line-length", NULL))) |
08bc1dc5 | 216 | display_width = be32_to_cpu(*p); |
e2eb6392 | 217 | if ((p = of_get_property(root, |
8f586b22 | 218 | "ibm,form-feed", NULL))) |
08bc1dc5 | 219 | form_feed = be32_to_cpu(*p); |
e2eb6392 | 220 | if ((p = of_get_property(root, |
8f586b22 | 221 | "ibm,display-number-of-lines", NULL))) |
08bc1dc5 | 222 | display_lines = be32_to_cpu(*p); |
e2eb6392 | 223 | row_width = of_get_property(root, |
8f586b22 | 224 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 225 | of_node_put(root); |
8f586b22 | 226 | } |
6566c6f1 AB |
227 | display_character = rtas_token("display-character"); |
228 | set_indicator = rtas_token("set-indicator"); | |
229 | } | |
230 | ||
231 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
232 | /* use hex display if available */ | |
233 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
234 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
235 | return; | |
236 | } | |
237 | ||
238 | spin_lock(&progress_lock); | |
239 | ||
240 | /* | |
241 | * Last write ended with newline, but we didn't print it since | |
242 | * it would just clear the bottom line of output. Print it now | |
243 | * instead. | |
244 | * | |
8f586b22 MS |
245 | * If no newline is pending and form feed is supported, clear the |
246 | * display with a form feed; otherwise, print a CR to start output | |
247 | * at the beginning of the line. | |
6566c6f1 AB |
248 | */ |
249 | if (pending_newline) { | |
250 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
251 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
252 | pending_newline = 0; | |
253 | } else { | |
8f586b22 MS |
254 | current_line = 0; |
255 | if (form_feed) | |
256 | rtas_call(display_character, 1, 1, NULL, | |
257 | (char)form_feed); | |
258 | else | |
259 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
260 | } |
261 | ||
8f586b22 MS |
262 | if (row_width) |
263 | width = row_width[current_line]; | |
264 | else | |
265 | width = display_width; | |
6566c6f1 AB |
266 | os = s; |
267 | while (*os) { | |
268 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
269 | /* If newline is the last character, save it |
270 | * until next call to avoid bumping up the | |
271 | * display output. | |
272 | */ | |
273 | if (*os == '\n' && !os[1]) { | |
274 | pending_newline = 1; | |
8f586b22 MS |
275 | current_line++; |
276 | if (current_line > display_lines-1) | |
277 | current_line = display_lines-1; | |
6566c6f1 AB |
278 | spin_unlock(&progress_lock); |
279 | return; | |
280 | } | |
281 | ||
282 | /* RTAS wants CR-LF, not just LF */ | |
283 | ||
284 | if (*os == '\n') { | |
285 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
286 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
287 | } else { | |
288 | /* CR might be used to re-draw a line, so we'll | |
289 | * leave it alone and not add LF. | |
290 | */ | |
291 | rtas_call(display_character, 1, 1, NULL, *os); | |
292 | } | |
293 | ||
8f586b22 MS |
294 | if (row_width) |
295 | width = row_width[current_line]; | |
296 | else | |
297 | width = display_width; | |
6566c6f1 AB |
298 | } else { |
299 | width--; | |
300 | rtas_call(display_character, 1, 1, NULL, *os); | |
301 | } | |
302 | ||
303 | os++; | |
304 | ||
305 | /* if we overwrite the screen length */ | |
306 | if (width <= 0) | |
307 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
308 | os++; | |
309 | } | |
310 | ||
6566c6f1 AB |
311 | spin_unlock(&progress_lock); |
312 | } | |
f4fcbbe9 | 313 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 314 | |
033ef338 | 315 | int rtas_token(const char *service) |
1da177e4 | 316 | { |
08bc1dc5 | 317 | const __be32 *tokp; |
033ef338 | 318 | if (rtas.dev == NULL) |
1da177e4 | 319 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 320 | tokp = of_get_property(rtas.dev, service, NULL); |
08bc1dc5 | 321 | return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE; |
1da177e4 | 322 | } |
ab3ab74d | 323 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 324 | |
f2d6d2d8 NL |
325 | int rtas_service_present(const char *service) |
326 | { | |
327 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
328 | } | |
329 | EXPORT_SYMBOL(rtas_service_present); | |
330 | ||
033ef338 | 331 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
332 | /* |
333 | * Return the firmware-specified size of the error log buffer | |
334 | * for all rtas calls that require an error buffer argument. | |
335 | * This includes 'check-exception' and 'rtas-last-error'. | |
336 | */ | |
337 | int rtas_get_error_log_max(void) | |
338 | { | |
339 | static int rtas_error_log_max; | |
340 | if (rtas_error_log_max) | |
341 | return rtas_error_log_max; | |
342 | ||
343 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
344 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
345 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
346 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
347 | rtas_error_log_max); | |
1da177e4 LT |
348 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
349 | } | |
350 | return rtas_error_log_max; | |
351 | } | |
033ef338 | 352 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
353 | |
354 | ||
1c21a293 ME |
355 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
356 | static int rtas_last_error_token; | |
033ef338 | 357 | |
1da177e4 LT |
358 | /** Return a copy of the detailed error text associated with the |
359 | * most recent failed call to rtas. Because the error text | |
360 | * might go stale if there are any other intervening rtas calls, | |
361 | * this routine must be called atomically with whatever produced | |
362 | * the error (i.e. with rtas.lock still held from the previous call). | |
363 | */ | |
033ef338 | 364 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
365 | { |
366 | struct rtas_args err_args, save_args; | |
367 | u32 bufsz; | |
033ef338 PM |
368 | char *buf = NULL; |
369 | ||
370 | if (rtas_last_error_token == -1) | |
371 | return NULL; | |
1da177e4 LT |
372 | |
373 | bufsz = rtas_get_error_log_max(); | |
374 | ||
27128264 AB |
375 | err_args.token = cpu_to_be32(rtas_last_error_token); |
376 | err_args.nargs = cpu_to_be32(2); | |
377 | err_args.nret = cpu_to_be32(1); | |
378 | err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); | |
379 | err_args.args[1] = cpu_to_be32(bufsz); | |
1da177e4 LT |
380 | err_args.args[2] = 0; |
381 | ||
382 | save_args = rtas.args; | |
383 | rtas.args = err_args; | |
384 | ||
385 | enter_rtas(__pa(&rtas.args)); | |
386 | ||
387 | err_args = rtas.args; | |
388 | rtas.args = save_args; | |
389 | ||
033ef338 PM |
390 | /* Log the error in the unlikely case that there was one. */ |
391 | if (unlikely(err_args.args[2] == 0)) { | |
392 | if (altbuf) { | |
393 | buf = altbuf; | |
394 | } else { | |
395 | buf = rtas_err_buf; | |
f691fa10 | 396 | if (slab_is_available()) |
033ef338 PM |
397 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); |
398 | } | |
399 | if (buf) | |
400 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
401 | } | |
402 | ||
403 | return buf; | |
1da177e4 LT |
404 | } |
405 | ||
033ef338 PM |
406 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
407 | ||
408 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
409 | #define __fetch_rtas_last_error(x) NULL | |
410 | #define get_errorlog_buffer() NULL | |
411 | #endif | |
412 | ||
209eb4e5 ME |
413 | |
414 | static void | |
415 | va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, | |
416 | va_list list) | |
417 | { | |
418 | int i; | |
419 | ||
420 | args->token = cpu_to_be32(token); | |
421 | args->nargs = cpu_to_be32(nargs); | |
422 | args->nret = cpu_to_be32(nret); | |
423 | args->rets = &(args->args[nargs]); | |
424 | ||
425 | for (i = 0; i < nargs; ++i) | |
426 | args->args[i] = cpu_to_be32(va_arg(list, __u32)); | |
427 | ||
428 | for (i = 0; i < nret; ++i) | |
429 | args->rets[i] = 0; | |
430 | ||
431 | enter_rtas(__pa(args)); | |
432 | } | |
433 | ||
434 | void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...) | |
435 | { | |
436 | va_list list; | |
437 | ||
438 | va_start(list, nret); | |
439 | va_rtas_call_unlocked(args, token, nargs, nret, list); | |
440 | va_end(list); | |
441 | } | |
442 | ||
1da177e4 LT |
443 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
444 | { | |
445 | va_list list; | |
033ef338 | 446 | int i; |
1da177e4 LT |
447 | unsigned long s; |
448 | struct rtas_args *rtas_args; | |
033ef338 | 449 | char *buff_copy = NULL; |
1da177e4 LT |
450 | int ret; |
451 | ||
24da3dd5 | 452 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
453 | return -1; |
454 | ||
f97bb36f | 455 | s = lock_rtas(); |
209eb4e5 ME |
456 | |
457 | /* We use the global rtas args buffer */ | |
1da177e4 LT |
458 | rtas_args = &rtas.args; |
459 | ||
1da177e4 | 460 | va_start(list, outputs); |
209eb4e5 | 461 | va_rtas_call_unlocked(rtas_args, token, nargs, nret, list); |
1da177e4 LT |
462 | va_end(list); |
463 | ||
1da177e4 LT |
464 | /* A -1 return code indicates that the last command couldn't |
465 | be completed due to a hardware error. */ | |
27128264 | 466 | if (be32_to_cpu(rtas_args->rets[0]) == -1) |
033ef338 | 467 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
468 | |
469 | if (nret > 1 && outputs != NULL) | |
470 | for (i = 0; i < nret-1; ++i) | |
27128264 AB |
471 | outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); |
472 | ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; | |
1da177e4 | 473 | |
f97bb36f | 474 | unlock_rtas(s); |
1da177e4 LT |
475 | |
476 | if (buff_copy) { | |
477 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
f691fa10 | 478 | if (slab_is_available()) |
1da177e4 LT |
479 | kfree(buff_copy); |
480 | } | |
481 | return ret; | |
482 | } | |
ab3ab74d | 483 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 484 | |
507279db JR |
485 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
486 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 487 | */ |
507279db | 488 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 489 | { |
507279db JR |
490 | int order; |
491 | unsigned int ms = 0; | |
492 | ||
493 | if (status == RTAS_BUSY) { | |
494 | ms = 1; | |
9ef03193 TH |
495 | } else if (status >= RTAS_EXTENDED_DELAY_MIN && |
496 | status <= RTAS_EXTENDED_DELAY_MAX) { | |
497 | order = status - RTAS_EXTENDED_DELAY_MIN; | |
507279db JR |
498 | for (ms = 1; order > 0; order--) |
499 | ms *= 10; | |
500 | } | |
1da177e4 | 501 | |
507279db JR |
502 | return ms; |
503 | } | |
ab3ab74d | 504 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 505 | |
507279db JR |
506 | /* For an RTAS busy status code, perform the hinted delay. */ |
507 | unsigned int rtas_busy_delay(int status) | |
508 | { | |
509 | unsigned int ms; | |
1da177e4 | 510 | |
507279db JR |
511 | might_sleep(); |
512 | ms = rtas_busy_delay_time(status); | |
eca590f4 | 513 | if (ms && need_resched()) |
507279db JR |
514 | msleep(ms); |
515 | ||
516 | return ms; | |
1da177e4 | 517 | } |
ab3ab74d | 518 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 519 | |
1c21a293 | 520 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
521 | { |
522 | int rc; | |
523 | ||
524 | switch (rtas_rc) { | |
525 | case -1: /* Hardware Error */ | |
526 | rc = -EIO; | |
527 | break; | |
528 | case -3: /* Bad indicator/domain/etc */ | |
529 | rc = -EINVAL; | |
530 | break; | |
531 | case -9000: /* Isolation error */ | |
532 | rc = -EFAULT; | |
533 | break; | |
534 | case -9001: /* Outstanding TCE/PTE */ | |
535 | rc = -EEXIST; | |
536 | break; | |
537 | case -9002: /* No usable slot */ | |
538 | rc = -ENODEV; | |
539 | break; | |
540 | default: | |
541 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 542 | __func__, rtas_rc); |
1da177e4 LT |
543 | rc = -ERANGE; |
544 | break; | |
545 | } | |
546 | return rc; | |
547 | } | |
548 | ||
549 | int rtas_get_power_level(int powerdomain, int *level) | |
550 | { | |
551 | int token = rtas_token("get-power-level"); | |
552 | int rc; | |
553 | ||
554 | if (token == RTAS_UNKNOWN_SERVICE) | |
555 | return -ENOENT; | |
556 | ||
557 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
558 | udelay(1); | |
559 | ||
560 | if (rc < 0) | |
561 | return rtas_error_rc(rc); | |
562 | return rc; | |
563 | } | |
ab3ab74d | 564 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
565 | |
566 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
567 | { | |
568 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
569 | int rc; |
570 | ||
571 | if (token == RTAS_UNKNOWN_SERVICE) | |
572 | return -ENOENT; | |
573 | ||
507279db | 574 | do { |
1da177e4 | 575 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 576 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
577 | |
578 | if (rc < 0) | |
579 | return rtas_error_rc(rc); | |
580 | return rc; | |
581 | } | |
ab3ab74d | 582 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
583 | |
584 | int rtas_get_sensor(int sensor, int index, int *state) | |
585 | { | |
586 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
587 | int rc; |
588 | ||
589 | if (token == RTAS_UNKNOWN_SERVICE) | |
590 | return -ENOENT; | |
591 | ||
507279db | 592 | do { |
1da177e4 | 593 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 594 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
595 | |
596 | if (rc < 0) | |
597 | return rtas_error_rc(rc); | |
598 | return rc; | |
599 | } | |
ab3ab74d | 600 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 | 601 | |
1c2cb594 TH |
602 | int rtas_get_sensor_fast(int sensor, int index, int *state) |
603 | { | |
604 | int token = rtas_token("get-sensor-state"); | |
605 | int rc; | |
606 | ||
607 | if (token == RTAS_UNKNOWN_SERVICE) | |
608 | return -ENOENT; | |
609 | ||
610 | rc = rtas_call(token, 2, 2, state, sensor, index); | |
611 | WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && | |
612 | rc <= RTAS_EXTENDED_DELAY_MAX)); | |
613 | ||
614 | if (rc < 0) | |
615 | return rtas_error_rc(rc); | |
616 | return rc; | |
617 | } | |
618 | ||
edc72ac4 NL |
619 | bool rtas_indicator_present(int token, int *maxindex) |
620 | { | |
621 | int proplen, count, i; | |
622 | const struct indicator_elem { | |
08bc1dc5 AB |
623 | __be32 token; |
624 | __be32 maxindex; | |
edc72ac4 NL |
625 | } *indicators; |
626 | ||
627 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); | |
628 | if (!indicators) | |
629 | return false; | |
630 | ||
631 | count = proplen / sizeof(struct indicator_elem); | |
632 | ||
633 | for (i = 0; i < count; i++) { | |
08bc1dc5 | 634 | if (__be32_to_cpu(indicators[i].token) != token) |
edc72ac4 NL |
635 | continue; |
636 | if (maxindex) | |
08bc1dc5 | 637 | *maxindex = __be32_to_cpu(indicators[i].maxindex); |
edc72ac4 NL |
638 | return true; |
639 | } | |
640 | ||
641 | return false; | |
642 | } | |
643 | EXPORT_SYMBOL(rtas_indicator_present); | |
644 | ||
1da177e4 LT |
645 | int rtas_set_indicator(int indicator, int index, int new_value) |
646 | { | |
647 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
648 | int rc; |
649 | ||
650 | if (token == RTAS_UNKNOWN_SERVICE) | |
651 | return -ENOENT; | |
652 | ||
507279db | 653 | do { |
1da177e4 | 654 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 655 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
656 | |
657 | if (rc < 0) | |
658 | return rtas_error_rc(rc); | |
659 | return rc; | |
660 | } | |
ab3ab74d | 661 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 662 | |
81b73dd9 HM |
663 | /* |
664 | * Ignoring RTAS extended delay | |
665 | */ | |
666 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
667 | { | |
668 | int rc; | |
669 | int token = rtas_token("set-indicator"); | |
670 | ||
671 | if (token == RTAS_UNKNOWN_SERVICE) | |
672 | return -ENOENT; | |
673 | ||
674 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
675 | ||
9ef03193 TH |
676 | WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && |
677 | rc <= RTAS_EXTENDED_DELAY_MAX)); | |
81b73dd9 HM |
678 | |
679 | if (rc < 0) | |
680 | return rtas_error_rc(rc); | |
681 | ||
682 | return rc; | |
683 | } | |
684 | ||
95ec77c0 | 685 | void __noreturn rtas_restart(char *cmd) |
1da177e4 | 686 | { |
f4fcbbe9 PM |
687 | if (rtas_flash_term_hook) |
688 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
689 | printk("RTAS system-reboot returned %d\n", |
690 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
691 | for (;;); | |
692 | } | |
693 | ||
033ef338 | 694 | void rtas_power_off(void) |
1da177e4 | 695 | { |
f4fcbbe9 PM |
696 | if (rtas_flash_term_hook) |
697 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
698 | /* allow power on only with power button press */ |
699 | printk("RTAS power-off returned %d\n", | |
700 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
701 | for (;;); | |
702 | } | |
703 | ||
95ec77c0 | 704 | void __noreturn rtas_halt(void) |
1da177e4 | 705 | { |
f4fcbbe9 PM |
706 | if (rtas_flash_term_hook) |
707 | rtas_flash_term_hook(SYS_HALT); | |
708 | /* allow power on only with power button press */ | |
709 | printk("RTAS power-off returned %d\n", | |
710 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
711 | for (;;); | |
1da177e4 LT |
712 | } |
713 | ||
714 | /* Must be in the RMO region, so we place it here */ | |
715 | static char rtas_os_term_buf[2048]; | |
716 | ||
8f515061 | 717 | void rtas_os_term(char *str) |
a2b51812 LV |
718 | { |
719 | int status; | |
39ed2fe6 | 720 | |
e9bbc8cd AB |
721 | /* |
722 | * Firmware with the ibm,extended-os-term property is guaranteed | |
723 | * to always return from an ibm,os-term call. Earlier versions without | |
724 | * this property may terminate the partition which we want to avoid | |
725 | * since it interferes with panic_timeout. | |
726 | */ | |
727 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || | |
728 | RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) | |
1da177e4 LT |
729 | return; |
730 | ||
8f515061 PM |
731 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
732 | ||
1da177e4 LT |
733 | do { |
734 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
735 | __pa(rtas_os_term_buf)); | |
507279db | 736 | } while (rtas_busy_delay(status)); |
1da177e4 | 737 | |
507279db | 738 | if (status != 0) |
e9bbc8cd | 739 | printk(KERN_EMERG "ibm,os-term call failed %d\n", status); |
1da177e4 LT |
740 | } |
741 | ||
91dc182c DB |
742 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
743 | #ifdef CONFIG_PPC_PSERIES | |
8fe93f8d BK |
744 | static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
745 | { | |
746 | u16 slb_size = mmu_slb_size; | |
747 | int rc = H_MULTI_THREADS_ACTIVE; | |
748 | int cpu; | |
749 | ||
750 | slb_set_size(SLB_MIN_SIZE); | |
751 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); | |
752 | ||
753 | while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && | |
754 | !atomic_read(&data->error)) | |
755 | rc = rtas_call(data->token, 0, 1, NULL); | |
756 | ||
757 | if (rc || atomic_read(&data->error)) { | |
758 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); | |
759 | slb_set_size(slb_size); | |
760 | } | |
761 | ||
762 | if (atomic_read(&data->error)) | |
763 | rc = atomic_read(&data->error); | |
764 | ||
765 | atomic_set(&data->error, rc); | |
9ee820fa | 766 | pSeries_coalesce_init(); |
8fe93f8d BK |
767 | |
768 | if (wake_when_done) { | |
769 | atomic_set(&data->done, 1); | |
770 | ||
771 | for_each_online_cpu(cpu) | |
772 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
773 | } | |
774 | ||
775 | if (atomic_dec_return(&data->working) == 0) | |
776 | complete(data->complete); | |
777 | ||
778 | return rc; | |
779 | } | |
780 | ||
781 | int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) | |
782 | { | |
783 | atomic_inc(&data->working); | |
784 | return __rtas_suspend_last_cpu(data, 0); | |
785 | } | |
786 | ||
787 | static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) | |
91dc182c | 788 | { |
f52862f4 | 789 | long rc = H_SUCCESS; |
8f5c7579 NL |
790 | unsigned long msr_save; |
791 | int cpu; | |
91dc182c | 792 | |
8f5c7579 NL |
793 | atomic_inc(&data->working); |
794 | ||
795 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
796 | msr_save = mfmsr(); | |
797 | mtmsr(msr_save & ~(MSR_EE)); | |
798 | ||
8fe93f8d | 799 | while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) |
f52862f4 | 800 | rc = plpar_hcall_norets(H_JOIN); |
8f5c7579 NL |
801 | |
802 | mtmsr(msr_save); | |
91dc182c | 803 | |
8f5c7579 NL |
804 | if (rc == H_SUCCESS) { |
805 | /* This cpu was prodded and the suspend is complete. */ | |
806 | goto out; | |
807 | } else if (rc == H_CONTINUE) { | |
808 | /* All other cpus are in H_JOIN, this cpu does | |
809 | * the suspend. | |
810 | */ | |
8fe93f8d | 811 | return __rtas_suspend_last_cpu(data, wake_when_done); |
91dc182c | 812 | } else { |
8f5c7579 NL |
813 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
814 | smp_processor_id(), rc); | |
8fe93f8d | 815 | atomic_set(&data->error, rc); |
91dc182c | 816 | } |
f52862f4 | 817 | |
8fe93f8d BK |
818 | if (wake_when_done) { |
819 | atomic_set(&data->done, 1); | |
f52862f4 | 820 | |
8fe93f8d BK |
821 | /* This cpu did the suspend or got an error; in either case, |
822 | * we need to prod all other other cpus out of join state. | |
823 | * Extra prods are harmless. | |
824 | */ | |
825 | for_each_online_cpu(cpu) | |
826 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
827 | } | |
91dc182c | 828 | out: |
8f5c7579 NL |
829 | if (atomic_dec_return(&data->working) == 0) |
830 | complete(data->complete); | |
8fe93f8d BK |
831 | return rc; |
832 | } | |
833 | ||
834 | int rtas_suspend_cpu(struct rtas_suspend_me_data *data) | |
835 | { | |
836 | return __rtas_suspend_cpu(data, 0); | |
837 | } | |
838 | ||
839 | static void rtas_percpu_suspend_me(void *info) | |
840 | { | |
841 | __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); | |
91dc182c DB |
842 | } |
843 | ||
120496ac RJ |
844 | enum rtas_cpu_state { |
845 | DOWN, | |
846 | UP, | |
847 | }; | |
848 | ||
849 | #ifndef CONFIG_SMP | |
850 | static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, | |
851 | cpumask_var_t cpus) | |
852 | { | |
853 | if (!cpumask_empty(cpus)) { | |
854 | cpumask_clear(cpus); | |
855 | return -EINVAL; | |
856 | } else | |
857 | return 0; | |
858 | } | |
859 | #else | |
860 | /* On return cpumask will be altered to indicate CPUs changed. | |
861 | * CPUs with states changed will be set in the mask, | |
862 | * CPUs with status unchanged will be unset in the mask. */ | |
863 | static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, | |
864 | cpumask_var_t cpus) | |
865 | { | |
866 | int cpu; | |
867 | int cpuret = 0; | |
868 | int ret = 0; | |
869 | ||
870 | if (cpumask_empty(cpus)) | |
871 | return 0; | |
872 | ||
873 | for_each_cpu(cpu, cpus) { | |
874 | switch (state) { | |
875 | case DOWN: | |
876 | cpuret = cpu_down(cpu); | |
877 | break; | |
878 | case UP: | |
879 | cpuret = cpu_up(cpu); | |
880 | break; | |
881 | } | |
882 | if (cpuret) { | |
883 | pr_debug("%s: cpu_%s for cpu#%d returned %d.\n", | |
884 | __func__, | |
885 | ((state == UP) ? "up" : "down"), | |
886 | cpu, cpuret); | |
887 | if (!ret) | |
888 | ret = cpuret; | |
889 | if (state == UP) { | |
890 | /* clear bits for unchanged cpus, return */ | |
891 | cpumask_shift_right(cpus, cpus, cpu); | |
892 | cpumask_shift_left(cpus, cpus, cpu); | |
893 | break; | |
894 | } else { | |
895 | /* clear bit for unchanged cpu, continue */ | |
896 | cpumask_clear_cpu(cpu, cpus); | |
897 | } | |
898 | } | |
899 | } | |
900 | ||
901 | return ret; | |
902 | } | |
903 | #endif | |
904 | ||
905 | int rtas_online_cpus_mask(cpumask_var_t cpus) | |
906 | { | |
907 | int ret; | |
908 | ||
909 | ret = rtas_cpu_state_change_mask(UP, cpus); | |
910 | ||
911 | if (ret) { | |
912 | cpumask_var_t tmp_mask; | |
913 | ||
0ee931c4 | 914 | if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL)) |
120496ac RJ |
915 | return ret; |
916 | ||
917 | /* Use tmp_mask to preserve cpus mask from first failure */ | |
918 | cpumask_copy(tmp_mask, cpus); | |
919 | rtas_offline_cpus_mask(tmp_mask); | |
920 | free_cpumask_var(tmp_mask); | |
921 | } | |
922 | ||
923 | return ret; | |
924 | } | |
925 | EXPORT_SYMBOL(rtas_online_cpus_mask); | |
926 | ||
927 | int rtas_offline_cpus_mask(cpumask_var_t cpus) | |
928 | { | |
929 | return rtas_cpu_state_change_mask(DOWN, cpus); | |
930 | } | |
931 | EXPORT_SYMBOL(rtas_offline_cpus_mask); | |
932 | ||
c03e7374 | 933 | int rtas_ibm_suspend_me(u64 handle) |
91dc182c | 934 | { |
368a6ba5 DB |
935 | long state; |
936 | long rc; | |
b9377ffc | 937 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 938 | struct rtas_suspend_me_data data; |
8f5c7579 | 939 | DECLARE_COMPLETION_ONSTACK(done); |
120496ac RJ |
940 | cpumask_var_t offline_mask; |
941 | int cpuret; | |
8f5c7579 NL |
942 | |
943 | if (!rtas_service_present("ibm,suspend-me")) | |
944 | return -ENOSYS; | |
91dc182c | 945 | |
368a6ba5 | 946 | /* Make sure the state is valid */ |
3df76a9d | 947 | rc = plpar_hcall(H_VASI_STATE, retbuf, handle); |
b9377ffc AB |
948 | |
949 | state = retbuf[0]; | |
368a6ba5 DB |
950 | |
951 | if (rc) { | |
952 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
953 | return rc; | |
954 | } else if (state == H_VASI_ENABLED) { | |
c03e7374 | 955 | return -EAGAIN; |
368a6ba5 DB |
956 | } else if (state != H_VASI_SUSPENDING) { |
957 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
958 | state); | |
c03e7374 | 959 | return -EIO; |
368a6ba5 DB |
960 | } |
961 | ||
0ee931c4 | 962 | if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL)) |
120496ac RJ |
963 | return -ENOMEM; |
964 | ||
8f5c7579 | 965 | atomic_set(&data.working, 0); |
f52862f4 | 966 | atomic_set(&data.done, 0); |
8fe93f8d | 967 | atomic_set(&data.error, 0); |
8f5c7579 | 968 | data.token = rtas_token("ibm,suspend-me"); |
8f5c7579 | 969 | data.complete = &done; |
120496ac RJ |
970 | |
971 | /* All present CPUs must be online */ | |
972 | cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask); | |
973 | cpuret = rtas_online_cpus_mask(offline_mask); | |
974 | if (cpuret) { | |
975 | pr_err("%s: Could not bring present CPUs online.\n", __func__); | |
976 | atomic_set(&data.error, cpuret); | |
977 | goto out; | |
978 | } | |
979 | ||
85a88cab | 980 | cpu_hotplug_disable(); |
91dc182c | 981 | |
dfd718a2 GS |
982 | /* Check if we raced with a CPU-Offline Operation */ |
983 | if (unlikely(!cpumask_equal(cpu_present_mask, cpu_online_mask))) { | |
984 | pr_err("%s: Raced against a concurrent CPU-Offline\n", | |
985 | __func__); | |
986 | atomic_set(&data.error, -EBUSY); | |
987 | goto out_hotplug_enable; | |
988 | } | |
989 | ||
91dc182c DB |
990 | /* Call function on all CPUs. One of us will make the |
991 | * rtas call | |
992 | */ | |
15c8b6c1 | 993 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8fe93f8d | 994 | atomic_set(&data.error, -EINVAL); |
91dc182c | 995 | |
8f5c7579 | 996 | wait_for_completion(&done); |
91dc182c | 997 | |
8fe93f8d | 998 | if (atomic_read(&data.error) != 0) |
8f5c7579 | 999 | printk(KERN_ERR "Error doing global join\n"); |
91dc182c | 1000 | |
dfd718a2 | 1001 | out_hotplug_enable: |
85a88cab | 1002 | cpu_hotplug_enable(); |
444080d1 | 1003 | |
120496ac RJ |
1004 | /* Take down CPUs not online prior to suspend */ |
1005 | cpuret = rtas_offline_cpus_mask(offline_mask); | |
1006 | if (cpuret) | |
1007 | pr_warn("%s: Could not restore CPUs to offline state.\n", | |
1008 | __func__); | |
1009 | ||
1010 | out: | |
1011 | free_cpumask_var(offline_mask); | |
8fe93f8d | 1012 | return atomic_read(&data.error); |
91dc182c DB |
1013 | } |
1014 | #else /* CONFIG_PPC_PSERIES */ | |
c03e7374 | 1015 | int rtas_ibm_suspend_me(u64 handle) |
91dc182c DB |
1016 | { |
1017 | return -ENOSYS; | |
1018 | } | |
1019 | #endif | |
1da177e4 | 1020 | |
6431f208 AB |
1021 | /** |
1022 | * Find a specific pseries error log in an RTAS extended event log. | |
1023 | * @log: RTAS error/event log | |
1024 | * @section_id: two character section identifier | |
1025 | * | |
1026 | * Returns a pointer to the specified errorlog or NULL if not found. | |
1027 | */ | |
1028 | struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, | |
1029 | uint16_t section_id) | |
1030 | { | |
1031 | struct rtas_ext_event_log_v6 *ext_log = | |
1032 | (struct rtas_ext_event_log_v6 *)log->buffer; | |
1033 | struct pseries_errorlog *sect; | |
1034 | unsigned char *p, *log_end; | |
a08a53ea GK |
1035 | uint32_t ext_log_length = rtas_error_extended_log_length(log); |
1036 | uint8_t log_format = rtas_ext_event_log_format(ext_log); | |
1037 | uint32_t company_id = rtas_ext_event_company_id(ext_log); | |
6431f208 AB |
1038 | |
1039 | /* Check that we understand the format */ | |
a08a53ea GK |
1040 | if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) || |
1041 | log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || | |
1042 | company_id != RTAS_V6EXT_COMPANY_ID_IBM) | |
6431f208 AB |
1043 | return NULL; |
1044 | ||
a08a53ea | 1045 | log_end = log->buffer + ext_log_length; |
6431f208 AB |
1046 | p = ext_log->vendor_log; |
1047 | ||
1048 | while (p < log_end) { | |
1049 | sect = (struct pseries_errorlog *)p; | |
a08a53ea | 1050 | if (pseries_errorlog_id(sect) == section_id) |
6431f208 | 1051 | return sect; |
a08a53ea | 1052 | p += pseries_errorlog_length(sect); |
6431f208 AB |
1053 | } |
1054 | ||
1055 | return NULL; | |
1056 | } | |
1057 | ||
599d2870 | 1058 | /* We assume to be passed big endian arguments */ |
4c392e65 | 1059 | SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs) |
1da177e4 LT |
1060 | { |
1061 | struct rtas_args args; | |
1062 | unsigned long flags; | |
033ef338 | 1063 | char *buff_copy, *errbuf = NULL; |
599d2870 | 1064 | int nargs, nret, token; |
1da177e4 LT |
1065 | |
1066 | if (!capable(CAP_SYS_ADMIN)) | |
1067 | return -EPERM; | |
1068 | ||
8832317f VH |
1069 | if (!rtas.entry) |
1070 | return -EINVAL; | |
1071 | ||
1da177e4 LT |
1072 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) |
1073 | return -EFAULT; | |
1074 | ||
599d2870 GK |
1075 | nargs = be32_to_cpu(args.nargs); |
1076 | nret = be32_to_cpu(args.nret); | |
1077 | token = be32_to_cpu(args.token); | |
1078 | ||
a9862c74 | 1079 | if (nargs >= ARRAY_SIZE(args.args) |
599d2870 GK |
1080 | || nret > ARRAY_SIZE(args.args) |
1081 | || nargs + nret > ARRAY_SIZE(args.args)) | |
1da177e4 LT |
1082 | return -EINVAL; |
1083 | ||
1084 | /* Copy in args. */ | |
1085 | if (copy_from_user(args.args, uargs->args, | |
1086 | nargs * sizeof(rtas_arg_t)) != 0) | |
1087 | return -EFAULT; | |
1088 | ||
599d2870 | 1089 | if (token == RTAS_UNKNOWN_SERVICE) |
91dc182c DB |
1090 | return -EINVAL; |
1091 | ||
b79998fc | 1092 | args.rets = &args.args[nargs]; |
599d2870 | 1093 | memset(args.rets, 0, nret * sizeof(rtas_arg_t)); |
b79998fc | 1094 | |
91dc182c | 1095 | /* Need to handle ibm,suspend_me call specially */ |
599d2870 | 1096 | if (token == ibm_suspend_me_token) { |
3df76a9d CB |
1097 | |
1098 | /* | |
c03e7374 TD |
1099 | * rtas_ibm_suspend_me assumes the streamid handle is in cpu |
1100 | * endian, or at least the hcall within it requires it. | |
3df76a9d | 1101 | */ |
c03e7374 | 1102 | int rc = 0; |
3df76a9d CB |
1103 | u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32) |
1104 | | be32_to_cpu(args.args[1]); | |
c03e7374 TD |
1105 | rc = rtas_ibm_suspend_me(handle); |
1106 | if (rc == -EAGAIN) | |
1107 | args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE); | |
1108 | else if (rc == -EIO) | |
1109 | args.rets[0] = cpu_to_be32(-1); | |
1110 | else if (rc) | |
91dc182c DB |
1111 | return rc; |
1112 | goto copy_return; | |
1113 | } | |
1114 | ||
033ef338 | 1115 | buff_copy = get_errorlog_buffer(); |
1da177e4 | 1116 | |
f97bb36f | 1117 | flags = lock_rtas(); |
1da177e4 LT |
1118 | |
1119 | rtas.args = args; | |
1120 | enter_rtas(__pa(&rtas.args)); | |
1121 | args = rtas.args; | |
1122 | ||
1da177e4 LT |
1123 | /* A -1 return code indicates that the last command couldn't |
1124 | be completed due to a hardware error. */ | |
599d2870 | 1125 | if (be32_to_cpu(args.rets[0]) == -1) |
033ef338 | 1126 | errbuf = __fetch_rtas_last_error(buff_copy); |
1da177e4 | 1127 | |
f97bb36f | 1128 | unlock_rtas(flags); |
1da177e4 LT |
1129 | |
1130 | if (buff_copy) { | |
033ef338 PM |
1131 | if (errbuf) |
1132 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
1133 | kfree(buff_copy); |
1134 | } | |
1135 | ||
91dc182c | 1136 | copy_return: |
1da177e4 LT |
1137 | /* Copy out args. */ |
1138 | if (copy_to_user(uargs->args + nargs, | |
1139 | args.args + nargs, | |
599d2870 | 1140 | nret * sizeof(rtas_arg_t)) != 0) |
1da177e4 LT |
1141 | return -EFAULT; |
1142 | ||
1143 | return 0; | |
1144 | } | |
1145 | ||
1da177e4 | 1146 | /* |
14ed7409 AB |
1147 | * Call early during boot, before mem init, to retrieve the RTAS |
1148 | * information from the device-tree and allocate the RMO buffer for userland | |
1da177e4 LT |
1149 | * accesses. |
1150 | */ | |
1151 | void __init rtas_initialize(void) | |
1152 | { | |
033ef338 | 1153 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
de6d2d1b GS |
1154 | u32 base, size, entry; |
1155 | int no_base, no_size, no_entry; | |
033ef338 | 1156 | |
1da177e4 LT |
1157 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
1158 | * about it. | |
1159 | */ | |
1160 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
033ef338 PM |
1161 | if (!rtas.dev) |
1162 | return; | |
1163 | ||
de6d2d1b GS |
1164 | no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base); |
1165 | no_size = of_property_read_u32(rtas.dev, "rtas-size", &size); | |
1166 | if (no_base || no_size) { | |
8b257783 | 1167 | of_node_put(rtas.dev); |
dbecd509 GS |
1168 | rtas.dev = NULL; |
1169 | return; | |
1170 | } | |
1171 | ||
de6d2d1b GS |
1172 | rtas.base = base; |
1173 | rtas.size = size; | |
1174 | no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry); | |
1175 | rtas.entry = no_entry ? rtas.base : entry; | |
dbecd509 | 1176 | |
1da177e4 LT |
1177 | /* If RTAS was found, allocate the RMO buffer for it and look for |
1178 | * the stop-self token if any | |
1179 | */ | |
033ef338 | 1180 | #ifdef CONFIG_PPC64 |
484cc1ed | 1181 | if (firmware_has_feature(FW_FEATURE_LPAR)) { |
cd3db0c4 | 1182 | rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
1183 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
1184 | } | |
033ef338 | 1185 | #endif |
0ba9e6ed MR |
1186 | rtas_rmo_buf = memblock_phys_alloc_range(RTAS_RMOBUF_MAX, PAGE_SIZE, |
1187 | 0, rtas_region); | |
1188 | if (!rtas_rmo_buf) | |
1189 | panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n", | |
1190 | PAGE_SIZE, &rtas_region); | |
1da177e4 | 1191 | |
033ef338 PM |
1192 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1193 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
1194 | #endif | |
1da177e4 | 1195 | } |
458148c0 ME |
1196 | |
1197 | int __init early_init_dt_scan_rtas(unsigned long node, | |
1198 | const char *uname, int depth, void *data) | |
1199 | { | |
9d0c4dfe | 1200 | const u32 *basep, *entryp, *sizep; |
458148c0 ME |
1201 | |
1202 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
1203 | return 0; | |
1204 | ||
1205 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
1206 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
1207 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
1208 | ||
1209 | if (basep && entryp && sizep) { | |
1210 | rtas.base = *basep; | |
1211 | rtas.entry = *entryp; | |
1212 | rtas.size = *sizep; | |
1213 | } | |
1214 | ||
cc46bb98 ME |
1215 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
1216 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
1217 | if (basep) | |
1218 | rtas_putchar_token = *basep; | |
1219 | ||
1220 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
1221 | if (basep) | |
1222 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
1223 | |
1224 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
1225 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
1226 | udbg_init_rtas_console(); | |
1227 | ||
cc46bb98 ME |
1228 | #endif |
1229 | ||
458148c0 ME |
1230 | /* break now */ |
1231 | return 1; | |
1232 | } | |
c4007a2f | 1233 | |
445c8951 | 1234 | static arch_spinlock_t timebase_lock; |
c4007a2f BH |
1235 | static u64 timebase = 0; |
1236 | ||
061d19f2 | 1237 | void rtas_give_timebase(void) |
c4007a2f BH |
1238 | { |
1239 | unsigned long flags; | |
1240 | ||
1241 | local_irq_save(flags); | |
1242 | hard_irq_disable(); | |
0199c4e6 | 1243 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1244 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); |
1245 | timebase = get_tb(); | |
0199c4e6 | 1246 | arch_spin_unlock(&timebase_lock); |
c4007a2f BH |
1247 | |
1248 | while (timebase) | |
1249 | barrier(); | |
1250 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
1251 | local_irq_restore(flags); | |
1252 | } | |
1253 | ||
061d19f2 | 1254 | void rtas_take_timebase(void) |
c4007a2f BH |
1255 | { |
1256 | while (!timebase) | |
1257 | barrier(); | |
0199c4e6 | 1258 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1259 | set_tb(timebase >> 32, timebase & 0xffffffff); |
1260 | timebase = 0; | |
0199c4e6 | 1261 | arch_spin_unlock(&timebase_lock); |
c4007a2f | 1262 | } |