Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Procedures for interfacing to the RTAS on CHRP machines. |
| 4 | * |
| 5 | * Peter Bergner, IBM March 2001. |
| 6 | * Copyright (C) 2001 IBM. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <stdarg.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
Randy Dunlap | a941564 | 2006-01-11 12:17:48 -0800 | [diff] [blame] | 20 | #include <linux/capability.h> |
Benjamin Herrenschmidt | 21fe330 | 2005-11-07 16:41:59 +1100 | [diff] [blame] | 21 | #include <linux/delay.h> |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 22 | #include <linux/smp.h> |
| 23 | #include <linux/completion.h> |
| 24 | #include <linux/cpumask.h> |
David S. Miller | d9b2b2a | 2008-02-13 16:56:49 -0800 | [diff] [blame] | 25 | #include <linux/lmb.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #include <asm/prom.h> |
| 28 | #include <asm/rtas.h> |
Michael Ellerman | 31a7f67 | 2006-01-31 17:17:47 +1100 | [diff] [blame] | 29 | #include <asm/hvcall.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/semaphore.h> |
| 31 | #include <asm/machdep.h> |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 32 | #include <asm/firmware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/page.h> |
| 34 | #include <asm/param.h> |
| 35 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/delay.h> |
| 37 | #include <asm/uaccess.h> |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 38 | #include <asm/udbg.h> |
Arnd Bergmann | a7f3184 | 2006-03-23 00:00:08 +0100 | [diff] [blame] | 39 | #include <asm/syscalls.h> |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 40 | #include <asm/smp.h> |
| 41 | #include <asm/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 43 | struct rtas_t rtas = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | .lock = SPIN_LOCK_UNLOCKED |
| 45 | }; |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 46 | EXPORT_SYMBOL(rtas); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 48 | struct rtas_suspend_me_data { |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 49 | atomic_t working; /* number of cpus accessing this struct */ |
| 50 | int token; /* ibm,suspend-me */ |
| 51 | int error; |
| 52 | struct completion *complete; /* wait on this until working == 0 */ |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 53 | }; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 56 | EXPORT_SYMBOL(rtas_data_buf_lock); |
| 57 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 58 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 59 | EXPORT_SYMBOL(rtas_data_buf); |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | unsigned long rtas_rmo_buf; |
| 62 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 63 | /* |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 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 | |
| 70 | /* |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 71 | * call_rtas_display_status and call_rtas_display_status_delay |
| 72 | * are designed only for very early low-level debugging, which |
| 73 | * is why the token is hard-coded to 10. |
| 74 | */ |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 75 | static void call_rtas_display_status(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
| 77 | struct rtas_args *args = &rtas.args; |
| 78 | unsigned long s; |
| 79 | |
| 80 | if (!rtas.base) |
| 81 | return; |
| 82 | spin_lock_irqsave(&rtas.lock, s); |
| 83 | |
| 84 | args->token = 10; |
| 85 | args->nargs = 1; |
| 86 | args->nret = 1; |
| 87 | args->rets = (rtas_arg_t *)&(args->args[1]); |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 88 | args->args[0] = (unsigned char)c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | enter_rtas(__pa(args)); |
| 91 | |
| 92 | spin_unlock_irqrestore(&rtas.lock, s); |
| 93 | } |
| 94 | |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 95 | static void call_rtas_display_status_delay(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
| 98 | static int width = 16; |
| 99 | |
| 100 | if (c == '\n') { |
| 101 | while (width-- > 0) |
| 102 | call_rtas_display_status(' '); |
| 103 | width = 16; |
Benjamin Herrenschmidt | 21fe330 | 2005-11-07 16:41:59 +1100 | [diff] [blame] | 104 | mdelay(500); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | pending_newline = 1; |
| 106 | } else { |
| 107 | if (pending_newline) { |
| 108 | call_rtas_display_status('\r'); |
| 109 | call_rtas_display_status('\n'); |
| 110 | } |
| 111 | pending_newline = 0; |
| 112 | if (width--) { |
| 113 | call_rtas_display_status(c); |
| 114 | udelay(10000); |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 119 | void __init udbg_init_rtas_panel(void) |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 120 | { |
| 121 | udbg_putc = call_rtas_display_status_delay; |
| 122 | } |
| 123 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 124 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
| 125 | |
| 126 | /* If you think you're dying before early_init_dt_scan_rtas() does its |
| 127 | * work, you can hard code the token values for your firmware here and |
| 128 | * hardcode rtas.base/entry etc. |
| 129 | */ |
| 130 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; |
| 131 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; |
| 132 | |
| 133 | static void udbg_rtascon_putc(char c) |
| 134 | { |
| 135 | int tries; |
| 136 | |
| 137 | if (!rtas.base) |
| 138 | return; |
| 139 | |
| 140 | /* Add CRs before LFs */ |
| 141 | if (c == '\n') |
| 142 | udbg_rtascon_putc('\r'); |
| 143 | |
| 144 | /* if there is more than one character to be displayed, wait a bit */ |
| 145 | for (tries = 0; tries < 16; tries++) { |
| 146 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) |
| 147 | break; |
| 148 | udelay(1000); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static int udbg_rtascon_getc_poll(void) |
| 153 | { |
| 154 | int c; |
| 155 | |
| 156 | if (!rtas.base) |
| 157 | return -1; |
| 158 | |
| 159 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) |
| 160 | return -1; |
| 161 | |
| 162 | return c; |
| 163 | } |
| 164 | |
| 165 | static int udbg_rtascon_getc(void) |
| 166 | { |
| 167 | int c; |
| 168 | |
| 169 | while ((c = udbg_rtascon_getc_poll()) == -1) |
| 170 | ; |
| 171 | |
| 172 | return c; |
| 173 | } |
| 174 | |
| 175 | |
| 176 | void __init udbg_init_rtas_console(void) |
| 177 | { |
| 178 | udbg_putc = udbg_rtascon_putc; |
| 179 | udbg_getc = udbg_rtascon_getc; |
| 180 | udbg_getc_poll = udbg_rtascon_getc_poll; |
| 181 | } |
| 182 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ |
| 183 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 184 | void rtas_progress(char *s, unsigned short hex) |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 185 | { |
| 186 | struct device_node *root; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 187 | int width; |
| 188 | const int *p; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 189 | char *os; |
| 190 | static int display_character, set_indicator; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 191 | static int display_width, display_lines, form_feed; |
Tobias Klauser | c5a69d5 | 2007-02-17 20:11:19 +0100 | [diff] [blame] | 192 | static const int *row_width; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 193 | static DEFINE_SPINLOCK(progress_lock); |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 194 | static int current_line; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 195 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
| 196 | |
| 197 | if (!rtas.base) |
| 198 | return; |
| 199 | |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 200 | if (display_width == 0) { |
| 201 | display_width = 0x10; |
Stephen Rothwell | 8c8dc32 | 2007-04-24 13:50:55 +1000 | [diff] [blame] | 202 | if ((root = of_find_node_by_path("/rtas"))) { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 203 | if ((p = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 204 | "ibm,display-line-length", NULL))) |
| 205 | display_width = *p; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 206 | if ((p = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 207 | "ibm,form-feed", NULL))) |
| 208 | form_feed = *p; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 209 | if ((p = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 210 | "ibm,display-number-of-lines", NULL))) |
| 211 | display_lines = *p; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 212 | row_width = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 213 | "ibm,display-truncation-length", NULL); |
Stephen Rothwell | 8c8dc32 | 2007-04-24 13:50:55 +1000 | [diff] [blame] | 214 | of_node_put(root); |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 215 | } |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 216 | display_character = rtas_token("display-character"); |
| 217 | set_indicator = rtas_token("set-indicator"); |
| 218 | } |
| 219 | |
| 220 | if (display_character == RTAS_UNKNOWN_SERVICE) { |
| 221 | /* use hex display if available */ |
| 222 | if (set_indicator != RTAS_UNKNOWN_SERVICE) |
| 223 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | spin_lock(&progress_lock); |
| 228 | |
| 229 | /* |
| 230 | * Last write ended with newline, but we didn't print it since |
| 231 | * it would just clear the bottom line of output. Print it now |
| 232 | * instead. |
| 233 | * |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 234 | * If no newline is pending and form feed is supported, clear the |
| 235 | * display with a form feed; otherwise, print a CR to start output |
| 236 | * at the beginning of the line. |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 237 | */ |
| 238 | if (pending_newline) { |
| 239 | rtas_call(display_character, 1, 1, NULL, '\r'); |
| 240 | rtas_call(display_character, 1, 1, NULL, '\n'); |
| 241 | pending_newline = 0; |
| 242 | } else { |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 243 | current_line = 0; |
| 244 | if (form_feed) |
| 245 | rtas_call(display_character, 1, 1, NULL, |
| 246 | (char)form_feed); |
| 247 | else |
| 248 | rtas_call(display_character, 1, 1, NULL, '\r'); |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 249 | } |
| 250 | |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 251 | if (row_width) |
| 252 | width = row_width[current_line]; |
| 253 | else |
| 254 | width = display_width; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 255 | os = s; |
| 256 | while (*os) { |
| 257 | if (*os == '\n' || *os == '\r') { |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 258 | /* If newline is the last character, save it |
| 259 | * until next call to avoid bumping up the |
| 260 | * display output. |
| 261 | */ |
| 262 | if (*os == '\n' && !os[1]) { |
| 263 | pending_newline = 1; |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 264 | current_line++; |
| 265 | if (current_line > display_lines-1) |
| 266 | current_line = display_lines-1; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 267 | spin_unlock(&progress_lock); |
| 268 | return; |
| 269 | } |
| 270 | |
| 271 | /* RTAS wants CR-LF, not just LF */ |
| 272 | |
| 273 | if (*os == '\n') { |
| 274 | rtas_call(display_character, 1, 1, NULL, '\r'); |
| 275 | rtas_call(display_character, 1, 1, NULL, '\n'); |
| 276 | } else { |
| 277 | /* CR might be used to re-draw a line, so we'll |
| 278 | * leave it alone and not add LF. |
| 279 | */ |
| 280 | rtas_call(display_character, 1, 1, NULL, *os); |
| 281 | } |
| 282 | |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 283 | if (row_width) |
| 284 | width = row_width[current_line]; |
| 285 | else |
| 286 | width = display_width; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 287 | } else { |
| 288 | width--; |
| 289 | rtas_call(display_character, 1, 1, NULL, *os); |
| 290 | } |
| 291 | |
| 292 | os++; |
| 293 | |
| 294 | /* if we overwrite the screen length */ |
| 295 | if (width <= 0) |
| 296 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) |
| 297 | os++; |
| 298 | } |
| 299 | |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 300 | spin_unlock(&progress_lock); |
| 301 | } |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 302 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 303 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 304 | int rtas_token(const char *service) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 306 | const int *tokp; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 307 | if (rtas.dev == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | return RTAS_UNKNOWN_SERVICE; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 309 | tokp = of_get_property(rtas.dev, service, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
| 311 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 312 | EXPORT_SYMBOL(rtas_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Nathan Lynch | f2d6d2d | 2006-12-06 18:50:45 -0600 | [diff] [blame] | 314 | int rtas_service_present(const char *service) |
| 315 | { |
| 316 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; |
| 317 | } |
| 318 | EXPORT_SYMBOL(rtas_service_present); |
| 319 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 320 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | /* |
| 322 | * Return the firmware-specified size of the error log buffer |
| 323 | * for all rtas calls that require an error buffer argument. |
| 324 | * This includes 'check-exception' and 'rtas-last-error'. |
| 325 | */ |
| 326 | int rtas_get_error_log_max(void) |
| 327 | { |
| 328 | static int rtas_error_log_max; |
| 329 | if (rtas_error_log_max) |
| 330 | return rtas_error_log_max; |
| 331 | |
| 332 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); |
| 333 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || |
| 334 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 335 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
| 336 | rtas_error_log_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
| 338 | } |
| 339 | return rtas_error_log_max; |
| 340 | } |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 341 | EXPORT_SYMBOL(rtas_get_error_log_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 344 | char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
| 345 | int rtas_last_error_token; |
| 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /** Return a copy of the detailed error text associated with the |
| 348 | * most recent failed call to rtas. Because the error text |
| 349 | * might go stale if there are any other intervening rtas calls, |
| 350 | * this routine must be called atomically with whatever produced |
| 351 | * the error (i.e. with rtas.lock still held from the previous call). |
| 352 | */ |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 353 | static char *__fetch_rtas_last_error(char *altbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
| 355 | struct rtas_args err_args, save_args; |
| 356 | u32 bufsz; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 357 | char *buf = NULL; |
| 358 | |
| 359 | if (rtas_last_error_token == -1) |
| 360 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | bufsz = rtas_get_error_log_max(); |
| 363 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 364 | err_args.token = rtas_last_error_token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | err_args.nargs = 2; |
| 366 | err_args.nret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
| 368 | err_args.args[1] = bufsz; |
| 369 | err_args.args[2] = 0; |
| 370 | |
| 371 | save_args = rtas.args; |
| 372 | rtas.args = err_args; |
| 373 | |
| 374 | enter_rtas(__pa(&rtas.args)); |
| 375 | |
| 376 | err_args = rtas.args; |
| 377 | rtas.args = save_args; |
| 378 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 379 | /* Log the error in the unlikely case that there was one. */ |
| 380 | if (unlikely(err_args.args[2] == 0)) { |
| 381 | if (altbuf) { |
| 382 | buf = altbuf; |
| 383 | } else { |
| 384 | buf = rtas_err_buf; |
| 385 | if (mem_init_done) |
| 386 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); |
| 387 | } |
| 388 | if (buf) |
| 389 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); |
| 390 | } |
| 391 | |
| 392 | return buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 395 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
| 396 | |
| 397 | #else /* CONFIG_RTAS_ERROR_LOGGING */ |
| 398 | #define __fetch_rtas_last_error(x) NULL |
| 399 | #define get_errorlog_buffer() NULL |
| 400 | #endif |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
| 403 | { |
| 404 | va_list list; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 405 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | unsigned long s; |
| 407 | struct rtas_args *rtas_args; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 408 | char *buff_copy = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | int ret; |
| 410 | |
Michael Ellerman | 24da3dd | 2006-06-23 18:20:10 +1000 | [diff] [blame] | 411 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return -1; |
| 413 | |
| 414 | /* Gotta do something different here, use global lock for now... */ |
| 415 | spin_lock_irqsave(&rtas.lock, s); |
| 416 | rtas_args = &rtas.args; |
| 417 | |
| 418 | rtas_args->token = token; |
| 419 | rtas_args->nargs = nargs; |
| 420 | rtas_args->nret = nret; |
| 421 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); |
| 422 | va_start(list, outputs); |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 423 | for (i = 0; i < nargs; ++i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | va_end(list); |
| 426 | |
| 427 | for (i = 0; i < nret; ++i) |
| 428 | rtas_args->rets[i] = 0; |
| 429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | enter_rtas(__pa(rtas_args)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | /* A -1 return code indicates that the last command couldn't |
| 433 | be completed due to a hardware error. */ |
| 434 | if (rtas_args->rets[0] == -1) |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 435 | buff_copy = __fetch_rtas_last_error(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
| 437 | if (nret > 1 && outputs != NULL) |
| 438 | for (i = 0; i < nret-1; ++i) |
| 439 | outputs[i] = rtas_args->rets[i+1]; |
| 440 | ret = (nret > 0)? rtas_args->rets[0]: 0; |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /* Gotta do something different here, use global lock for now... */ |
| 443 | spin_unlock_irqrestore(&rtas.lock, s); |
| 444 | |
| 445 | if (buff_copy) { |
| 446 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); |
| 447 | if (mem_init_done) |
| 448 | kfree(buff_copy); |
| 449 | } |
| 450 | return ret; |
| 451 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 452 | EXPORT_SYMBOL(rtas_call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 454 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
| 455 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | */ |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 457 | unsigned int rtas_busy_delay_time(int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 459 | int order; |
| 460 | unsigned int ms = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 462 | if (status == RTAS_BUSY) { |
| 463 | ms = 1; |
| 464 | } else if (status >= 9900 && status <= 9905) { |
| 465 | order = status - 9900; |
| 466 | for (ms = 1; order > 0; order--) |
| 467 | ms *= 10; |
| 468 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 470 | return ms; |
| 471 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 472 | EXPORT_SYMBOL(rtas_busy_delay_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 474 | /* For an RTAS busy status code, perform the hinted delay. */ |
| 475 | unsigned int rtas_busy_delay(int status) |
| 476 | { |
| 477 | unsigned int ms; |
| 478 | |
| 479 | might_sleep(); |
| 480 | ms = rtas_busy_delay_time(status); |
| 481 | if (ms) |
| 482 | msleep(ms); |
| 483 | |
| 484 | return ms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 486 | EXPORT_SYMBOL(rtas_busy_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
| 488 | int rtas_error_rc(int rtas_rc) |
| 489 | { |
| 490 | int rc; |
| 491 | |
| 492 | switch (rtas_rc) { |
| 493 | case -1: /* Hardware Error */ |
| 494 | rc = -EIO; |
| 495 | break; |
| 496 | case -3: /* Bad indicator/domain/etc */ |
| 497 | rc = -EINVAL; |
| 498 | break; |
| 499 | case -9000: /* Isolation error */ |
| 500 | rc = -EFAULT; |
| 501 | break; |
| 502 | case -9001: /* Outstanding TCE/PTE */ |
| 503 | rc = -EEXIST; |
| 504 | break; |
| 505 | case -9002: /* No usable slot */ |
| 506 | rc = -ENODEV; |
| 507 | break; |
| 508 | default: |
| 509 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame^] | 510 | __func__, rtas_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | rc = -ERANGE; |
| 512 | break; |
| 513 | } |
| 514 | return rc; |
| 515 | } |
| 516 | |
| 517 | int rtas_get_power_level(int powerdomain, int *level) |
| 518 | { |
| 519 | int token = rtas_token("get-power-level"); |
| 520 | int rc; |
| 521 | |
| 522 | if (token == RTAS_UNKNOWN_SERVICE) |
| 523 | return -ENOENT; |
| 524 | |
| 525 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) |
| 526 | udelay(1); |
| 527 | |
| 528 | if (rc < 0) |
| 529 | return rtas_error_rc(rc); |
| 530 | return rc; |
| 531 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 532 | EXPORT_SYMBOL(rtas_get_power_level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) |
| 535 | { |
| 536 | int token = rtas_token("set-power-level"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | int rc; |
| 538 | |
| 539 | if (token == RTAS_UNKNOWN_SERVICE) |
| 540 | return -ENOENT; |
| 541 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 542 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 544 | } while (rtas_busy_delay(rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | if (rc < 0) |
| 547 | return rtas_error_rc(rc); |
| 548 | return rc; |
| 549 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 550 | EXPORT_SYMBOL(rtas_set_power_level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
| 552 | int rtas_get_sensor(int sensor, int index, int *state) |
| 553 | { |
| 554 | int token = rtas_token("get-sensor-state"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | int rc; |
| 556 | |
| 557 | if (token == RTAS_UNKNOWN_SERVICE) |
| 558 | return -ENOENT; |
| 559 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 560 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | rc = rtas_call(token, 2, 2, state, sensor, index); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 562 | } while (rtas_busy_delay(rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | if (rc < 0) |
| 565 | return rtas_error_rc(rc); |
| 566 | return rc; |
| 567 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 568 | EXPORT_SYMBOL(rtas_get_sensor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | int rtas_set_indicator(int indicator, int index, int new_value) |
| 571 | { |
| 572 | int token = rtas_token("set-indicator"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | int rc; |
| 574 | |
| 575 | if (token == RTAS_UNKNOWN_SERVICE) |
| 576 | return -ENOENT; |
| 577 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 578 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 580 | } while (rtas_busy_delay(rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
| 582 | if (rc < 0) |
| 583 | return rtas_error_rc(rc); |
| 584 | return rc; |
| 585 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 586 | EXPORT_SYMBOL(rtas_set_indicator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Haren Myneni | 81b73dd | 2006-07-27 14:29:00 -0700 | [diff] [blame] | 588 | /* |
| 589 | * Ignoring RTAS extended delay |
| 590 | */ |
| 591 | int rtas_set_indicator_fast(int indicator, int index, int new_value) |
| 592 | { |
| 593 | int rc; |
| 594 | int token = rtas_token("set-indicator"); |
| 595 | |
| 596 | if (token == RTAS_UNKNOWN_SERVICE) |
| 597 | return -ENOENT; |
| 598 | |
| 599 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
| 600 | |
| 601 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); |
| 602 | |
| 603 | if (rc < 0) |
| 604 | return rtas_error_rc(rc); |
| 605 | |
| 606 | return rc; |
| 607 | } |
| 608 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 609 | void rtas_restart(char *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | { |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 611 | if (rtas_flash_term_hook) |
| 612 | rtas_flash_term_hook(SYS_RESTART); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | printk("RTAS system-reboot returned %d\n", |
| 614 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); |
| 615 | for (;;); |
| 616 | } |
| 617 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 618 | void rtas_power_off(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 620 | if (rtas_flash_term_hook) |
| 621 | rtas_flash_term_hook(SYS_POWER_OFF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* allow power on only with power button press */ |
| 623 | printk("RTAS power-off returned %d\n", |
| 624 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); |
| 625 | for (;;); |
| 626 | } |
| 627 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 628 | void rtas_halt(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | { |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 630 | if (rtas_flash_term_hook) |
| 631 | rtas_flash_term_hook(SYS_HALT); |
| 632 | /* allow power on only with power button press */ |
| 633 | printk("RTAS power-off returned %d\n", |
| 634 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); |
| 635 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | } |
| 637 | |
| 638 | /* Must be in the RMO region, so we place it here */ |
| 639 | static char rtas_os_term_buf[2048]; |
| 640 | |
Paul Mackerras | 8f51506 | 2007-12-03 09:30:04 +1100 | [diff] [blame] | 641 | void rtas_os_term(char *str) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | { |
| 643 | int status; |
| 644 | |
Paul Mackerras | 8f51506 | 2007-12-03 09:30:04 +1100 | [diff] [blame] | 645 | if (panic_timeout) |
| 646 | return; |
| 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) |
| 649 | return; |
| 650 | |
Paul Mackerras | 8f51506 | 2007-12-03 09:30:04 +1100 | [diff] [blame] | 651 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
| 652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | do { |
| 654 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, |
| 655 | __pa(rtas_os_term_buf)); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 656 | } while (rtas_busy_delay(status)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 658 | if (status != 0) |
| 659 | printk(KERN_EMERG "ibm,os-term call failed %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 663 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
| 664 | #ifdef CONFIG_PPC_PSERIES |
| 665 | static void rtas_percpu_suspend_me(void *info) |
| 666 | { |
| 667 | long rc; |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 668 | unsigned long msr_save; |
| 669 | int cpu; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 670 | struct rtas_suspend_me_data *data = |
| 671 | (struct rtas_suspend_me_data *)info; |
| 672 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 673 | atomic_inc(&data->working); |
| 674 | |
| 675 | /* really need to ensure MSR.EE is off for H_JOIN */ |
| 676 | msr_save = mfmsr(); |
| 677 | mtmsr(msr_save & ~(MSR_EE)); |
| 678 | |
| 679 | rc = plpar_hcall_norets(H_JOIN); |
| 680 | |
| 681 | mtmsr(msr_save); |
| 682 | |
| 683 | if (rc == H_SUCCESS) { |
| 684 | /* This cpu was prodded and the suspend is complete. */ |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 685 | goto out; |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 686 | } else if (rc == H_CONTINUE) { |
| 687 | /* All other cpus are in H_JOIN, this cpu does |
| 688 | * the suspend. |
| 689 | */ |
| 690 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", |
| 691 | smp_processor_id()); |
| 692 | data->error = rtas_call(data->token, 0, 1, NULL); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 693 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 694 | if (data->error) |
| 695 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", |
| 696 | data->error); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 697 | } else { |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 698 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
| 699 | smp_processor_id(), rc); |
| 700 | data->error = rc; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 701 | } |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 702 | /* This cpu did the suspend or got an error; in either case, |
| 703 | * we need to prod all other other cpus out of join state. |
| 704 | * Extra prods are harmless. |
| 705 | */ |
| 706 | for_each_online_cpu(cpu) |
| 707 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 708 | out: |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 709 | if (atomic_dec_return(&data->working) == 0) |
| 710 | complete(data->complete); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | static int rtas_ibm_suspend_me(struct rtas_args *args) |
| 714 | { |
Dave C Boutcher | 368a6ba | 2006-06-12 19:49:20 -0500 | [diff] [blame] | 715 | long state; |
| 716 | long rc; |
Anton Blanchard | b9377ff | 2006-07-19 08:01:28 +1000 | [diff] [blame] | 717 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 718 | struct rtas_suspend_me_data data; |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 719 | DECLARE_COMPLETION_ONSTACK(done); |
| 720 | |
| 721 | if (!rtas_service_present("ibm,suspend-me")) |
| 722 | return -ENOSYS; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 723 | |
Dave C Boutcher | 368a6ba | 2006-06-12 19:49:20 -0500 | [diff] [blame] | 724 | /* Make sure the state is valid */ |
Anton Blanchard | b9377ff | 2006-07-19 08:01:28 +1000 | [diff] [blame] | 725 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
| 726 | ((u64)args->args[0] << 32) | args->args[1]); |
| 727 | |
| 728 | state = retbuf[0]; |
Dave C Boutcher | 368a6ba | 2006-06-12 19:49:20 -0500 | [diff] [blame] | 729 | |
| 730 | if (rc) { |
| 731 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); |
| 732 | return rc; |
| 733 | } else if (state == H_VASI_ENABLED) { |
| 734 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; |
| 735 | return 0; |
| 736 | } else if (state != H_VASI_SUSPENDING) { |
| 737 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", |
| 738 | state); |
| 739 | args->args[args->nargs] = -1; |
| 740 | return 0; |
| 741 | } |
| 742 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 743 | atomic_set(&data.working, 0); |
| 744 | data.token = rtas_token("ibm,suspend-me"); |
| 745 | data.error = 0; |
| 746 | data.complete = &done; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 747 | |
| 748 | /* Call function on all CPUs. One of us will make the |
| 749 | * rtas call |
| 750 | */ |
| 751 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0)) |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 752 | data.error = -EINVAL; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 753 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 754 | wait_for_completion(&done); |
| 755 | |
| 756 | if (data.error != 0) |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 757 | printk(KERN_ERR "Error doing global join\n"); |
| 758 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 759 | return data.error; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 760 | } |
| 761 | #else /* CONFIG_PPC_PSERIES */ |
| 762 | static int rtas_ibm_suspend_me(struct rtas_args *args) |
| 763 | { |
| 764 | return -ENOSYS; |
| 765 | } |
| 766 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
| 768 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) |
| 769 | { |
| 770 | struct rtas_args args; |
| 771 | unsigned long flags; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 772 | char *buff_copy, *errbuf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | int nargs; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 774 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
| 776 | if (!capable(CAP_SYS_ADMIN)) |
| 777 | return -EPERM; |
| 778 | |
| 779 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) |
| 780 | return -EFAULT; |
| 781 | |
| 782 | nargs = args.nargs; |
| 783 | if (nargs > ARRAY_SIZE(args.args) |
| 784 | || args.nret > ARRAY_SIZE(args.args) |
| 785 | || nargs + args.nret > ARRAY_SIZE(args.args)) |
| 786 | return -EINVAL; |
| 787 | |
| 788 | /* Copy in args. */ |
| 789 | if (copy_from_user(args.args, uargs->args, |
| 790 | nargs * sizeof(rtas_arg_t)) != 0) |
| 791 | return -EFAULT; |
| 792 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 793 | if (args.token == RTAS_UNKNOWN_SERVICE) |
| 794 | return -EINVAL; |
| 795 | |
| 796 | /* Need to handle ibm,suspend_me call specially */ |
| 797 | if (args.token == ibm_suspend_me_token) { |
| 798 | rc = rtas_ibm_suspend_me(&args); |
| 799 | if (rc) |
| 800 | return rc; |
| 801 | goto copy_return; |
| 802 | } |
| 803 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 804 | buff_copy = get_errorlog_buffer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
| 806 | spin_lock_irqsave(&rtas.lock, flags); |
| 807 | |
| 808 | rtas.args = args; |
| 809 | enter_rtas(__pa(&rtas.args)); |
| 810 | args = rtas.args; |
| 811 | |
| 812 | args.rets = &args.args[nargs]; |
| 813 | |
| 814 | /* A -1 return code indicates that the last command couldn't |
| 815 | be completed due to a hardware error. */ |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 816 | if (args.rets[0] == -1) |
| 817 | errbuf = __fetch_rtas_last_error(buff_copy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
| 819 | spin_unlock_irqrestore(&rtas.lock, flags); |
| 820 | |
| 821 | if (buff_copy) { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 822 | if (errbuf) |
| 823 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | kfree(buff_copy); |
| 825 | } |
| 826 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 827 | copy_return: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | /* Copy out args. */ |
| 829 | if (copy_to_user(uargs->args + nargs, |
| 830 | args.args + nargs, |
| 831 | args.nret * sizeof(rtas_arg_t)) != 0) |
| 832 | return -EFAULT; |
| 833 | |
| 834 | return 0; |
| 835 | } |
| 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | /* |
Adrian Bunk | 943ffb5 | 2006-01-10 00:10:13 +0100 | [diff] [blame] | 838 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | * informations from the device-tree and allocate the RMO buffer for userland |
| 840 | * accesses. |
| 841 | */ |
| 842 | void __init rtas_initialize(void) |
| 843 | { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 844 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
| 845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
| 847 | * about it. |
| 848 | */ |
| 849 | rtas.dev = of_find_node_by_name(NULL, "rtas"); |
| 850 | if (rtas.dev) { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 851 | const u32 *basep, *entryp, *sizep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 853 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
| 854 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | if (basep != NULL && sizep != NULL) { |
| 856 | rtas.base = *basep; |
| 857 | rtas.size = *sizep; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 858 | entryp = of_get_property(rtas.dev, |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 859 | "linux,rtas-entry", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | if (entryp == NULL) /* Ugh */ |
| 861 | rtas.entry = rtas.base; |
| 862 | else |
| 863 | rtas.entry = *entryp; |
| 864 | } else |
| 865 | rtas.dev = NULL; |
| 866 | } |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 867 | if (!rtas.dev) |
| 868 | return; |
| 869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | /* If RTAS was found, allocate the RMO buffer for it and look for |
| 871 | * the stop-self token if any |
| 872 | */ |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 873 | #ifdef CONFIG_PPC64 |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 874 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 875 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 876 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
| 877 | } |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 878 | #endif |
| 879 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 881 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
| 882 | rtas_last_error_token = rtas_token("rtas-last-error"); |
| 883 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
Michael Ellerman | 458148c | 2006-06-23 18:20:13 +1000 | [diff] [blame] | 885 | |
| 886 | int __init early_init_dt_scan_rtas(unsigned long node, |
| 887 | const char *uname, int depth, void *data) |
| 888 | { |
| 889 | u32 *basep, *entryp, *sizep; |
| 890 | |
| 891 | if (depth != 1 || strcmp(uname, "rtas") != 0) |
| 892 | return 0; |
| 893 | |
| 894 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); |
| 895 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); |
| 896 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); |
| 897 | |
| 898 | if (basep && entryp && sizep) { |
| 899 | rtas.base = *basep; |
| 900 | rtas.entry = *entryp; |
| 901 | rtas.size = *sizep; |
| 902 | } |
| 903 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 904 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
| 905 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); |
| 906 | if (basep) |
| 907 | rtas_putchar_token = *basep; |
| 908 | |
| 909 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); |
| 910 | if (basep) |
| 911 | rtas_getchar_token = *basep; |
Michael Neuling | 9a2ded5 | 2006-08-16 23:12:14 -0500 | [diff] [blame] | 912 | |
| 913 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && |
| 914 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) |
| 915 | udbg_init_rtas_console(); |
| 916 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 917 | #endif |
| 918 | |
Michael Ellerman | 458148c | 2006-06-23 18:20:13 +1000 | [diff] [blame] | 919 | /* break now */ |
| 920 | return 1; |
| 921 | } |