Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Communication to userspace based on kernel/printk.c | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/proc_fs.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/cpu.h> | |
f8729e85 | 22 | #include <linux/workqueue.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/rtas.h> | |
28 | #include <asm/prom.h> | |
29 | #include <asm/nvram.h> | |
60063497 | 30 | #include <linux/atomic.h> |
e8222502 | 31 | #include <asm/machdep.h> |
1da177e4 | 32 | |
1da177e4 LT |
33 | |
34 | static DEFINE_SPINLOCK(rtasd_log_lock); | |
35 | ||
541b2755 | 36 | static DECLARE_WAIT_QUEUE_HEAD(rtas_log_wait); |
1da177e4 LT |
37 | |
38 | static char *rtas_log_buf; | |
39 | static unsigned long rtas_log_start; | |
40 | static unsigned long rtas_log_size; | |
41 | ||
42 | static int surveillance_timeout = -1; | |
3d541c4b | 43 | |
1da177e4 LT |
44 | static unsigned int rtas_error_log_max; |
45 | static unsigned int rtas_error_log_buffer_max; | |
46 | ||
a4fc3a3c LV |
47 | /* RTAS service tokens */ |
48 | static unsigned int event_scan; | |
49 | static unsigned int rtas_event_scan_rate; | |
50 | ||
1da177e4 LT |
51 | static int full_rtas_msgs = 0; |
52 | ||
79c0108d | 53 | /* Stop logging to nvram after first fatal error */ |
a0c7ce9c TB |
54 | static int logging_enabled; /* Until we initialize everything, |
55 | * make sure we don't try logging | |
56 | * anything */ | |
0f2342c8 | 57 | static int error_log_cnt; |
1da177e4 LT |
58 | |
59 | /* | |
60 | * Since we use 32 bit RTAS, the physical address of this must be below | |
61 | * 4G or else bad things happen. Allocate this in the kernel data and | |
62 | * make it big enough. | |
63 | */ | |
64 | static unsigned char logdata[RTAS_ERROR_LOG_MAX]; | |
65 | ||
1da177e4 LT |
66 | static char *rtas_type[] = { |
67 | "Unknown", "Retry", "TCE Error", "Internal Device Failure", | |
68 | "Timeout", "Data Parity", "Address Parity", "Cache Parity", | |
69 | "Address Invalid", "ECC Uncorrected", "ECC Corrupted", | |
70 | }; | |
71 | ||
72 | static char *rtas_event_type(int type) | |
73 | { | |
74 | if ((type > 0) && (type < 11)) | |
75 | return rtas_type[type]; | |
76 | ||
77 | switch (type) { | |
78 | case RTAS_TYPE_EPOW: | |
79 | return "EPOW"; | |
80 | case RTAS_TYPE_PLATFORM: | |
81 | return "Platform Error"; | |
82 | case RTAS_TYPE_IO: | |
83 | return "I/O Event"; | |
84 | case RTAS_TYPE_INFO: | |
85 | return "Platform Information Event"; | |
86 | case RTAS_TYPE_DEALLOC: | |
87 | return "Resource Deallocation Event"; | |
88 | case RTAS_TYPE_DUMP: | |
89 | return "Dump Notification Event"; | |
90 | } | |
91 | ||
92 | return rtas_type[0]; | |
93 | } | |
94 | ||
95 | /* To see this info, grep RTAS /var/log/messages and each entry | |
96 | * will be collected together with obvious begin/end. | |
97 | * There will be a unique identifier on the begin and end lines. | |
98 | * This will persist across reboots. | |
99 | * | |
100 | * format of error logs returned from RTAS: | |
101 | * bytes (size) : contents | |
102 | * -------------------------------------------------------- | |
103 | * 0-7 (8) : rtas_error_log | |
104 | * 8-47 (40) : extended info | |
105 | * 48-51 (4) : vendor id | |
106 | * 52-1023 (vendor specific) : location code and debug data | |
107 | */ | |
108 | static void printk_log_rtas(char *buf, int len) | |
109 | { | |
110 | ||
111 | int i,j,n = 0; | |
112 | int perline = 16; | |
113 | char buffer[64]; | |
114 | char * str = "RTAS event"; | |
115 | ||
116 | if (full_rtas_msgs) { | |
117 | printk(RTAS_DEBUG "%d -------- %s begin --------\n", | |
118 | error_log_cnt, str); | |
119 | ||
120 | /* | |
121 | * Print perline bytes on each line, each line will start | |
122 | * with RTAS and a changing number, so syslogd will | |
123 | * print lines that are otherwise the same. Separate every | |
124 | * 4 bytes with a space. | |
125 | */ | |
126 | for (i = 0; i < len; i++) { | |
127 | j = i % perline; | |
128 | if (j == 0) { | |
129 | memset(buffer, 0, sizeof(buffer)); | |
130 | n = sprintf(buffer, "RTAS %d:", i/perline); | |
131 | } | |
132 | ||
133 | if ((i % 4) == 0) | |
134 | n += sprintf(buffer+n, " "); | |
135 | ||
136 | n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]); | |
137 | ||
138 | if (j == (perline-1)) | |
139 | printk(KERN_DEBUG "%s\n", buffer); | |
140 | } | |
141 | if ((i % perline) != 0) | |
142 | printk(KERN_DEBUG "%s\n", buffer); | |
143 | ||
144 | printk(RTAS_DEBUG "%d -------- %s end ----------\n", | |
145 | error_log_cnt, str); | |
146 | } else { | |
147 | struct rtas_error_log *errlog = (struct rtas_error_log *)buf; | |
148 | ||
149 | printk(RTAS_DEBUG "event: %d, Type: %s, Severity: %d\n", | |
150 | error_log_cnt, rtas_event_type(errlog->type), | |
151 | errlog->severity); | |
152 | } | |
153 | } | |
154 | ||
155 | static int log_rtas_len(char * buf) | |
156 | { | |
157 | int len; | |
158 | struct rtas_error_log *err; | |
159 | ||
160 | /* rtas fixed header */ | |
161 | len = 8; | |
162 | err = (struct rtas_error_log *)buf; | |
7f32c9c6 | 163 | if (err->extended && err->extended_log_length) { |
1da177e4 LT |
164 | |
165 | /* extended header */ | |
166 | len += err->extended_log_length; | |
167 | } | |
168 | ||
4511dad4 LV |
169 | if (rtas_error_log_max == 0) |
170 | rtas_error_log_max = rtas_get_error_log_max(); | |
171 | ||
1da177e4 LT |
172 | if (len > rtas_error_log_max) |
173 | len = rtas_error_log_max; | |
174 | ||
175 | return len; | |
176 | } | |
177 | ||
178 | /* | |
179 | * First write to nvram, if fatal error, that is the only | |
180 | * place we log the info. The error will be picked up | |
181 | * on the next reboot by rtasd. If not fatal, run the | |
182 | * method for the type of error. Currently, only RTAS | |
183 | * errors have methods implemented, but in the future | |
184 | * there might be a need to store data in nvram before a | |
185 | * call to panic(). | |
186 | * | |
187 | * XXX We write to nvram periodically, to indicate error has | |
188 | * been written and sync'd, but there is a possibility | |
189 | * that if we don't shutdown correctly, a duplicate error | |
190 | * record will be created on next reboot. | |
191 | */ | |
192 | void pSeries_log_error(char *buf, unsigned int err_type, int fatal) | |
193 | { | |
194 | unsigned long offset; | |
195 | unsigned long s; | |
196 | int len = 0; | |
197 | ||
f7ebf352 | 198 | pr_debug("rtasd: logging event\n"); |
1da177e4 LT |
199 | if (buf == NULL) |
200 | return; | |
201 | ||
202 | spin_lock_irqsave(&rtasd_log_lock, s); | |
203 | ||
204 | /* get length and increase count */ | |
205 | switch (err_type & ERR_TYPE_MASK) { | |
206 | case ERR_TYPE_RTAS_LOG: | |
207 | len = log_rtas_len(buf); | |
208 | if (!(err_type & ERR_FLAG_BOOT)) | |
209 | error_log_cnt++; | |
210 | break; | |
211 | case ERR_TYPE_KERNEL_PANIC: | |
212 | default: | |
64db4cff | 213 | WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ |
1da177e4 LT |
214 | spin_unlock_irqrestore(&rtasd_log_lock, s); |
215 | return; | |
216 | } | |
217 | ||
3d541c4b | 218 | #ifdef CONFIG_PPC64 |
1da177e4 | 219 | /* Write error to NVRAM */ |
a0c7ce9c | 220 | if (logging_enabled && !(err_type & ERR_FLAG_BOOT)) |
0f2342c8 | 221 | nvram_write_error_log(buf, len, err_type, error_log_cnt); |
3d541c4b | 222 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
223 | |
224 | /* | |
225 | * rtas errors can occur during boot, and we do want to capture | |
226 | * those somewhere, even if nvram isn't ready (why not?), and even | |
227 | * if rtasd isn't ready. Put them into the boot log, at least. | |
228 | */ | |
229 | if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG) | |
230 | printk_log_rtas(buf, len); | |
231 | ||
232 | /* Check to see if we need to or have stopped logging */ | |
a0c7ce9c TB |
233 | if (fatal || !logging_enabled) { |
234 | logging_enabled = 0; | |
64db4cff | 235 | WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ |
1da177e4 LT |
236 | spin_unlock_irqrestore(&rtasd_log_lock, s); |
237 | return; | |
238 | } | |
239 | ||
240 | /* call type specific method for error */ | |
241 | switch (err_type & ERR_TYPE_MASK) { | |
242 | case ERR_TYPE_RTAS_LOG: | |
243 | offset = rtas_error_log_buffer_max * | |
244 | ((rtas_log_start+rtas_log_size) & LOG_NUMBER_MASK); | |
245 | ||
246 | /* First copy over sequence number */ | |
247 | memcpy(&rtas_log_buf[offset], (void *) &error_log_cnt, sizeof(int)); | |
248 | ||
249 | /* Second copy over error log data */ | |
250 | offset += sizeof(int); | |
251 | memcpy(&rtas_log_buf[offset], buf, len); | |
252 | ||
253 | if (rtas_log_size < LOG_NUMBER) | |
254 | rtas_log_size += 1; | |
255 | else | |
256 | rtas_log_start += 1; | |
257 | ||
64db4cff | 258 | WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ |
1da177e4 LT |
259 | spin_unlock_irqrestore(&rtasd_log_lock, s); |
260 | wake_up_interruptible(&rtas_log_wait); | |
261 | break; | |
262 | case ERR_TYPE_KERNEL_PANIC: | |
263 | default: | |
64db4cff | 264 | WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ |
1da177e4 LT |
265 | spin_unlock_irqrestore(&rtasd_log_lock, s); |
266 | return; | |
267 | } | |
268 | ||
269 | } | |
270 | ||
1da177e4 LT |
271 | static int rtas_log_open(struct inode * inode, struct file * file) |
272 | { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static int rtas_log_release(struct inode * inode, struct file * file) | |
277 | { | |
278 | return 0; | |
279 | } | |
280 | ||
281 | /* This will check if all events are logged, if they are then, we | |
282 | * know that we can safely clear the events in NVRAM. | |
283 | * Next we'll sit and wait for something else to log. | |
284 | */ | |
285 | static ssize_t rtas_log_read(struct file * file, char __user * buf, | |
286 | size_t count, loff_t *ppos) | |
287 | { | |
288 | int error; | |
289 | char *tmp; | |
290 | unsigned long s; | |
291 | unsigned long offset; | |
292 | ||
293 | if (!buf || count < rtas_error_log_buffer_max) | |
294 | return -EINVAL; | |
295 | ||
296 | count = rtas_error_log_buffer_max; | |
297 | ||
298 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
299 | return -EFAULT; | |
300 | ||
301 | tmp = kmalloc(count, GFP_KERNEL); | |
302 | if (!tmp) | |
303 | return -ENOMEM; | |
304 | ||
1da177e4 | 305 | spin_lock_irqsave(&rtasd_log_lock, s); |
3d541c4b | 306 | |
1da177e4 | 307 | /* if it's 0, then we know we got the last one (the one in NVRAM) */ |
76c31f23 VM |
308 | while (rtas_log_size == 0) { |
309 | if (file->f_flags & O_NONBLOCK) { | |
310 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
311 | error = -EAGAIN; | |
312 | goto out; | |
313 | } | |
1da177e4 | 314 | |
76c31f23 VM |
315 | if (!logging_enabled) { |
316 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
317 | error = -ENODATA; | |
318 | goto out; | |
319 | } | |
3d541c4b | 320 | #ifdef CONFIG_PPC64 |
76c31f23 | 321 | nvram_clear_error_log(); |
3d541c4b | 322 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 323 | |
76c31f23 VM |
324 | spin_unlock_irqrestore(&rtasd_log_lock, s); |
325 | error = wait_event_interruptible(rtas_log_wait, rtas_log_size); | |
326 | if (error) | |
327 | goto out; | |
328 | spin_lock_irqsave(&rtasd_log_lock, s); | |
329 | } | |
1da177e4 | 330 | |
1da177e4 LT |
331 | offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK); |
332 | memcpy(tmp, &rtas_log_buf[offset], count); | |
333 | ||
334 | rtas_log_start += 1; | |
335 | rtas_log_size -= 1; | |
336 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
337 | ||
338 | error = copy_to_user(buf, tmp, count) ? -EFAULT : count; | |
339 | out: | |
340 | kfree(tmp); | |
341 | return error; | |
342 | } | |
343 | ||
344 | static unsigned int rtas_log_poll(struct file *file, poll_table * wait) | |
345 | { | |
346 | poll_wait(file, &rtas_log_wait, wait); | |
347 | if (rtas_log_size) | |
348 | return POLLIN | POLLRDNORM; | |
349 | return 0; | |
350 | } | |
351 | ||
541b2755 | 352 | static const struct file_operations proc_rtas_log_operations = { |
1da177e4 LT |
353 | .read = rtas_log_read, |
354 | .poll = rtas_log_poll, | |
355 | .open = rtas_log_open, | |
356 | .release = rtas_log_release, | |
6038f373 | 357 | .llseek = noop_llseek, |
1da177e4 LT |
358 | }; |
359 | ||
360 | static int enable_surveillance(int timeout) | |
361 | { | |
362 | int error; | |
363 | ||
364 | error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout); | |
365 | ||
366 | if (error == 0) | |
367 | return 0; | |
368 | ||
369 | if (error == -EINVAL) { | |
90ddfebe | 370 | printk(KERN_DEBUG "rtasd: surveillance not supported\n"); |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | ||
374 | printk(KERN_ERR "rtasd: could not update surveillance\n"); | |
375 | return -1; | |
376 | } | |
377 | ||
a4fc3a3c | 378 | static void do_event_scan(void) |
1da177e4 LT |
379 | { |
380 | int error; | |
381 | do { | |
382 | memset(logdata, 0, rtas_error_log_max); | |
383 | error = rtas_call(event_scan, 4, 1, NULL, | |
384 | RTAS_EVENT_SCAN_ALL_EVENTS, 0, | |
385 | __pa(logdata), rtas_error_log_max); | |
386 | if (error == -1) { | |
387 | printk(KERN_ERR "event-scan failed\n"); | |
388 | break; | |
389 | } | |
390 | ||
391 | if (error == 0) | |
392 | pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0); | |
393 | ||
394 | } while(error == 0); | |
395 | } | |
396 | ||
f8729e85 AB |
397 | static void rtas_event_scan(struct work_struct *w); |
398 | DECLARE_DELAYED_WORK(event_scan_work, rtas_event_scan); | |
399 | ||
400 | /* | |
401 | * Delay should be at least one second since some machines have problems if | |
402 | * we call event-scan too quickly. | |
403 | */ | |
404 | static unsigned long event_scan_delay = 1*HZ; | |
405 | static int first_pass = 1; | |
406 | ||
407 | static void rtas_event_scan(struct work_struct *w) | |
1da177e4 | 408 | { |
f8729e85 AB |
409 | unsigned int cpu; |
410 | ||
411 | do_event_scan(); | |
1da177e4 | 412 | |
86ef5c9a | 413 | get_online_cpus(); |
f8729e85 | 414 | |
9ff0c61d PM |
415 | /* raw_ OK because just using CPU as starting point. */ |
416 | cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask); | |
d5f86fe3 AB |
417 | if (cpu >= nr_cpu_ids) { |
418 | cpu = cpumask_first(cpu_online_mask); | |
f8729e85 AB |
419 | |
420 | if (first_pass) { | |
421 | first_pass = 0; | |
422 | event_scan_delay = 30*HZ/rtas_event_scan_rate; | |
423 | ||
424 | if (surveillance_timeout != -1) { | |
425 | pr_debug("rtasd: enabling surveillance\n"); | |
426 | enable_surveillance(surveillance_timeout); | |
427 | pr_debug("rtasd: surveillance enabled\n"); | |
428 | } | |
429 | } | |
1da177e4 | 430 | } |
f8729e85 AB |
431 | |
432 | schedule_delayed_work_on(cpu, &event_scan_work, | |
433 | __round_jiffies_relative(event_scan_delay, cpu)); | |
434 | ||
86ef5c9a | 435 | put_online_cpus(); |
1da177e4 LT |
436 | } |
437 | ||
3d541c4b BH |
438 | #ifdef CONFIG_PPC64 |
439 | static void retreive_nvram_error_log(void) | |
1da177e4 | 440 | { |
3d541c4b BH |
441 | unsigned int err_type ; |
442 | int rc ; | |
1da177e4 LT |
443 | |
444 | /* See if we have any error stored in NVRAM */ | |
445 | memset(logdata, 0, rtas_error_log_max); | |
0f2342c8 LV |
446 | rc = nvram_read_error_log(logdata, rtas_error_log_max, |
447 | &err_type, &error_log_cnt); | |
a0c7ce9c TB |
448 | /* We can use rtas_log_buf now */ |
449 | logging_enabled = 1; | |
1da177e4 LT |
450 | if (!rc) { |
451 | if (err_type != ERR_FLAG_ALREADY_LOGGED) { | |
452 | pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0); | |
453 | } | |
454 | } | |
3d541c4b BH |
455 | } |
456 | #else /* CONFIG_PPC64 */ | |
457 | static void retreive_nvram_error_log(void) | |
458 | { | |
459 | } | |
460 | #endif /* CONFIG_PPC64 */ | |
461 | ||
462 | static void start_event_scan(void) | |
463 | { | |
464 | printk(KERN_DEBUG "RTAS daemon started\n"); | |
465 | pr_debug("rtasd: will sleep for %d milliseconds\n", | |
466 | (30000 / rtas_event_scan_rate)); | |
467 | ||
25985edc | 468 | /* Retrieve errors from nvram if any */ |
3d541c4b | 469 | retreive_nvram_error_log(); |
1da177e4 | 470 | |
d5f86fe3 AB |
471 | schedule_delayed_work_on(cpumask_first(cpu_online_mask), |
472 | &event_scan_work, event_scan_delay); | |
1da177e4 LT |
473 | } |
474 | ||
475 | static int __init rtas_init(void) | |
476 | { | |
477 | struct proc_dir_entry *entry; | |
478 | ||
3d541c4b | 479 | if (!machine_is(pseries) && !machine_is(chrp)) |
799d6046 PM |
480 | return 0; |
481 | ||
482 | /* No RTAS */ | |
a4fc3a3c LV |
483 | event_scan = rtas_token("event-scan"); |
484 | if (event_scan == RTAS_UNKNOWN_SERVICE) { | |
3d541c4b | 485 | printk(KERN_INFO "rtasd: No event-scan on system\n"); |
49c28e4e | 486 | return -ENODEV; |
1da177e4 LT |
487 | } |
488 | ||
4511dad4 LV |
489 | rtas_event_scan_rate = rtas_token("rtas-event-scan-rate"); |
490 | if (rtas_event_scan_rate == RTAS_UNKNOWN_SERVICE) { | |
491 | printk(KERN_ERR "rtasd: no rtas-event-scan-rate on system\n"); | |
492 | return -ENODEV; | |
493 | } | |
494 | ||
7358650e ME |
495 | if (!rtas_event_scan_rate) { |
496 | /* Broken firmware: take a rate of zero to mean don't scan */ | |
497 | printk(KERN_DEBUG "rtasd: scan rate is 0, not scanning\n"); | |
498 | return 0; | |
499 | } | |
500 | ||
4511dad4 LV |
501 | /* Make room for the sequence number */ |
502 | rtas_error_log_max = rtas_get_error_log_max(); | |
503 | rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int); | |
504 | ||
505 | rtas_log_buf = vmalloc(rtas_error_log_buffer_max*LOG_NUMBER); | |
506 | if (!rtas_log_buf) { | |
507 | printk(KERN_ERR "rtasd: no memory\n"); | |
508 | return -ENOMEM; | |
509 | } | |
510 | ||
3d541c4b | 511 | entry = proc_create("powerpc/rtas/error_log", S_IRUSR, NULL, |
66747138 DL |
512 | &proc_rtas_log_operations); |
513 | if (!entry) | |
1da177e4 LT |
514 | printk(KERN_ERR "Failed to create error_log proc entry\n"); |
515 | ||
f8729e85 | 516 | start_event_scan(); |
1da177e4 LT |
517 | |
518 | return 0; | |
519 | } | |
3d541c4b | 520 | __initcall(rtas_init); |
1da177e4 LT |
521 | |
522 | static int __init surveillance_setup(char *str) | |
523 | { | |
524 | int i; | |
525 | ||
3d541c4b BH |
526 | /* We only do surveillance on pseries */ |
527 | if (!machine_is(pseries)) | |
528 | return 0; | |
529 | ||
1da177e4 LT |
530 | if (get_option(&str,&i)) { |
531 | if (i >= 0 && i <= 255) | |
532 | surveillance_timeout = i; | |
533 | } | |
534 | ||
535 | return 1; | |
536 | } | |
3d541c4b | 537 | __setup("surveillance=", surveillance_setup); |
1da177e4 LT |
538 | |
539 | static int __init rtasmsgs_setup(char *str) | |
540 | { | |
541 | if (strcmp(str, "on") == 0) | |
542 | full_rtas_msgs = 1; | |
543 | else if (strcmp(str, "off") == 0) | |
544 | full_rtas_msgs = 0; | |
545 | ||
546 | return 1; | |
547 | } | |
1da177e4 | 548 | __setup("rtasmsgs=", rtasmsgs_setup); |