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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> | |
22 | ||
23 | #include <asm/uaccess.h> | |
24 | #include <asm/io.h> | |
25 | #include <asm/rtas.h> | |
26 | #include <asm/prom.h> | |
27 | #include <asm/nvram.h> | |
28 | #include <asm/atomic.h> | |
29 | #include <asm/systemcfg.h> | |
30 | ||
31 | #if 0 | |
32 | #define DEBUG(A...) printk(KERN_ERR A) | |
33 | #else | |
34 | #define DEBUG(A...) | |
35 | #endif | |
36 | ||
37 | static DEFINE_SPINLOCK(rtasd_log_lock); | |
38 | ||
39 | DECLARE_WAIT_QUEUE_HEAD(rtas_log_wait); | |
40 | ||
41 | static char *rtas_log_buf; | |
42 | static unsigned long rtas_log_start; | |
43 | static unsigned long rtas_log_size; | |
44 | ||
45 | static int surveillance_timeout = -1; | |
46 | static unsigned int rtas_event_scan_rate; | |
47 | static unsigned int rtas_error_log_max; | |
48 | static unsigned int rtas_error_log_buffer_max; | |
49 | ||
50 | static int full_rtas_msgs = 0; | |
51 | ||
52 | extern int no_logging; | |
53 | ||
54 | volatile int error_log_cnt = 0; | |
55 | ||
56 | /* | |
57 | * Since we use 32 bit RTAS, the physical address of this must be below | |
58 | * 4G or else bad things happen. Allocate this in the kernel data and | |
59 | * make it big enough. | |
60 | */ | |
61 | static unsigned char logdata[RTAS_ERROR_LOG_MAX]; | |
62 | ||
63 | static int get_eventscan_parms(void); | |
64 | ||
65 | static char *rtas_type[] = { | |
66 | "Unknown", "Retry", "TCE Error", "Internal Device Failure", | |
67 | "Timeout", "Data Parity", "Address Parity", "Cache Parity", | |
68 | "Address Invalid", "ECC Uncorrected", "ECC Corrupted", | |
69 | }; | |
70 | ||
71 | static char *rtas_event_type(int type) | |
72 | { | |
73 | if ((type > 0) && (type < 11)) | |
74 | return rtas_type[type]; | |
75 | ||
76 | switch (type) { | |
77 | case RTAS_TYPE_EPOW: | |
78 | return "EPOW"; | |
79 | case RTAS_TYPE_PLATFORM: | |
80 | return "Platform Error"; | |
81 | case RTAS_TYPE_IO: | |
82 | return "I/O Event"; | |
83 | case RTAS_TYPE_INFO: | |
84 | return "Platform Information Event"; | |
85 | case RTAS_TYPE_DEALLOC: | |
86 | return "Resource Deallocation Event"; | |
87 | case RTAS_TYPE_DUMP: | |
88 | return "Dump Notification Event"; | |
89 | } | |
90 | ||
91 | return rtas_type[0]; | |
92 | } | |
93 | ||
94 | /* To see this info, grep RTAS /var/log/messages and each entry | |
95 | * will be collected together with obvious begin/end. | |
96 | * There will be a unique identifier on the begin and end lines. | |
97 | * This will persist across reboots. | |
98 | * | |
99 | * format of error logs returned from RTAS: | |
100 | * bytes (size) : contents | |
101 | * -------------------------------------------------------- | |
102 | * 0-7 (8) : rtas_error_log | |
103 | * 8-47 (40) : extended info | |
104 | * 48-51 (4) : vendor id | |
105 | * 52-1023 (vendor specific) : location code and debug data | |
106 | */ | |
107 | static void printk_log_rtas(char *buf, int len) | |
108 | { | |
109 | ||
110 | int i,j,n = 0; | |
111 | int perline = 16; | |
112 | char buffer[64]; | |
113 | char * str = "RTAS event"; | |
114 | ||
115 | if (full_rtas_msgs) { | |
116 | printk(RTAS_DEBUG "%d -------- %s begin --------\n", | |
117 | error_log_cnt, str); | |
118 | ||
119 | /* | |
120 | * Print perline bytes on each line, each line will start | |
121 | * with RTAS and a changing number, so syslogd will | |
122 | * print lines that are otherwise the same. Separate every | |
123 | * 4 bytes with a space. | |
124 | */ | |
125 | for (i = 0; i < len; i++) { | |
126 | j = i % perline; | |
127 | if (j == 0) { | |
128 | memset(buffer, 0, sizeof(buffer)); | |
129 | n = sprintf(buffer, "RTAS %d:", i/perline); | |
130 | } | |
131 | ||
132 | if ((i % 4) == 0) | |
133 | n += sprintf(buffer+n, " "); | |
134 | ||
135 | n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]); | |
136 | ||
137 | if (j == (perline-1)) | |
138 | printk(KERN_DEBUG "%s\n", buffer); | |
139 | } | |
140 | if ((i % perline) != 0) | |
141 | printk(KERN_DEBUG "%s\n", buffer); | |
142 | ||
143 | printk(RTAS_DEBUG "%d -------- %s end ----------\n", | |
144 | error_log_cnt, str); | |
145 | } else { | |
146 | struct rtas_error_log *errlog = (struct rtas_error_log *)buf; | |
147 | ||
148 | printk(RTAS_DEBUG "event: %d, Type: %s, Severity: %d\n", | |
149 | error_log_cnt, rtas_event_type(errlog->type), | |
150 | errlog->severity); | |
151 | } | |
152 | } | |
153 | ||
154 | static int log_rtas_len(char * buf) | |
155 | { | |
156 | int len; | |
157 | struct rtas_error_log *err; | |
158 | ||
159 | /* rtas fixed header */ | |
160 | len = 8; | |
161 | err = (struct rtas_error_log *)buf; | |
162 | if (err->extended_log_length) { | |
163 | ||
164 | /* extended header */ | |
165 | len += err->extended_log_length; | |
166 | } | |
167 | ||
168 | if (rtas_error_log_max == 0) { | |
169 | get_eventscan_parms(); | |
170 | } | |
171 | if (len > rtas_error_log_max) | |
172 | len = rtas_error_log_max; | |
173 | ||
174 | return len; | |
175 | } | |
176 | ||
177 | /* | |
178 | * First write to nvram, if fatal error, that is the only | |
179 | * place we log the info. The error will be picked up | |
180 | * on the next reboot by rtasd. If not fatal, run the | |
181 | * method for the type of error. Currently, only RTAS | |
182 | * errors have methods implemented, but in the future | |
183 | * there might be a need to store data in nvram before a | |
184 | * call to panic(). | |
185 | * | |
186 | * XXX We write to nvram periodically, to indicate error has | |
187 | * been written and sync'd, but there is a possibility | |
188 | * that if we don't shutdown correctly, a duplicate error | |
189 | * record will be created on next reboot. | |
190 | */ | |
191 | void pSeries_log_error(char *buf, unsigned int err_type, int fatal) | |
192 | { | |
193 | unsigned long offset; | |
194 | unsigned long s; | |
195 | int len = 0; | |
196 | ||
197 | DEBUG("logging event\n"); | |
198 | if (buf == NULL) | |
199 | return; | |
200 | ||
201 | spin_lock_irqsave(&rtasd_log_lock, s); | |
202 | ||
203 | /* get length and increase count */ | |
204 | switch (err_type & ERR_TYPE_MASK) { | |
205 | case ERR_TYPE_RTAS_LOG: | |
206 | len = log_rtas_len(buf); | |
207 | if (!(err_type & ERR_FLAG_BOOT)) | |
208 | error_log_cnt++; | |
209 | break; | |
210 | case ERR_TYPE_KERNEL_PANIC: | |
211 | default: | |
212 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
213 | return; | |
214 | } | |
215 | ||
216 | /* Write error to NVRAM */ | |
217 | if (!no_logging && !(err_type & ERR_FLAG_BOOT)) | |
218 | nvram_write_error_log(buf, len, err_type); | |
219 | ||
220 | /* | |
221 | * rtas errors can occur during boot, and we do want to capture | |
222 | * those somewhere, even if nvram isn't ready (why not?), and even | |
223 | * if rtasd isn't ready. Put them into the boot log, at least. | |
224 | */ | |
225 | if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG) | |
226 | printk_log_rtas(buf, len); | |
227 | ||
228 | /* Check to see if we need to or have stopped logging */ | |
229 | if (fatal || no_logging) { | |
230 | no_logging = 1; | |
231 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
232 | return; | |
233 | } | |
234 | ||
235 | /* call type specific method for error */ | |
236 | switch (err_type & ERR_TYPE_MASK) { | |
237 | case ERR_TYPE_RTAS_LOG: | |
238 | offset = rtas_error_log_buffer_max * | |
239 | ((rtas_log_start+rtas_log_size) & LOG_NUMBER_MASK); | |
240 | ||
241 | /* First copy over sequence number */ | |
242 | memcpy(&rtas_log_buf[offset], (void *) &error_log_cnt, sizeof(int)); | |
243 | ||
244 | /* Second copy over error log data */ | |
245 | offset += sizeof(int); | |
246 | memcpy(&rtas_log_buf[offset], buf, len); | |
247 | ||
248 | if (rtas_log_size < LOG_NUMBER) | |
249 | rtas_log_size += 1; | |
250 | else | |
251 | rtas_log_start += 1; | |
252 | ||
253 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
254 | wake_up_interruptible(&rtas_log_wait); | |
255 | break; | |
256 | case ERR_TYPE_KERNEL_PANIC: | |
257 | default: | |
258 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
259 | return; | |
260 | } | |
261 | ||
262 | } | |
263 | ||
264 | ||
265 | static int rtas_log_open(struct inode * inode, struct file * file) | |
266 | { | |
267 | return 0; | |
268 | } | |
269 | ||
270 | static int rtas_log_release(struct inode * inode, struct file * file) | |
271 | { | |
272 | return 0; | |
273 | } | |
274 | ||
275 | /* This will check if all events are logged, if they are then, we | |
276 | * know that we can safely clear the events in NVRAM. | |
277 | * Next we'll sit and wait for something else to log. | |
278 | */ | |
279 | static ssize_t rtas_log_read(struct file * file, char __user * buf, | |
280 | size_t count, loff_t *ppos) | |
281 | { | |
282 | int error; | |
283 | char *tmp; | |
284 | unsigned long s; | |
285 | unsigned long offset; | |
286 | ||
287 | if (!buf || count < rtas_error_log_buffer_max) | |
288 | return -EINVAL; | |
289 | ||
290 | count = rtas_error_log_buffer_max; | |
291 | ||
292 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
293 | return -EFAULT; | |
294 | ||
295 | tmp = kmalloc(count, GFP_KERNEL); | |
296 | if (!tmp) | |
297 | return -ENOMEM; | |
298 | ||
299 | ||
300 | spin_lock_irqsave(&rtasd_log_lock, s); | |
301 | /* if it's 0, then we know we got the last one (the one in NVRAM) */ | |
302 | if (rtas_log_size == 0 && !no_logging) | |
303 | nvram_clear_error_log(); | |
304 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
305 | ||
306 | ||
307 | error = wait_event_interruptible(rtas_log_wait, rtas_log_size); | |
308 | if (error) | |
309 | goto out; | |
310 | ||
311 | spin_lock_irqsave(&rtasd_log_lock, s); | |
312 | offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK); | |
313 | memcpy(tmp, &rtas_log_buf[offset], count); | |
314 | ||
315 | rtas_log_start += 1; | |
316 | rtas_log_size -= 1; | |
317 | spin_unlock_irqrestore(&rtasd_log_lock, s); | |
318 | ||
319 | error = copy_to_user(buf, tmp, count) ? -EFAULT : count; | |
320 | out: | |
321 | kfree(tmp); | |
322 | return error; | |
323 | } | |
324 | ||
325 | static unsigned int rtas_log_poll(struct file *file, poll_table * wait) | |
326 | { | |
327 | poll_wait(file, &rtas_log_wait, wait); | |
328 | if (rtas_log_size) | |
329 | return POLLIN | POLLRDNORM; | |
330 | return 0; | |
331 | } | |
332 | ||
333 | struct file_operations proc_rtas_log_operations = { | |
334 | .read = rtas_log_read, | |
335 | .poll = rtas_log_poll, | |
336 | .open = rtas_log_open, | |
337 | .release = rtas_log_release, | |
338 | }; | |
339 | ||
340 | static int enable_surveillance(int timeout) | |
341 | { | |
342 | int error; | |
343 | ||
344 | error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout); | |
345 | ||
346 | if (error == 0) | |
347 | return 0; | |
348 | ||
349 | if (error == -EINVAL) { | |
350 | printk(KERN_INFO "rtasd: surveillance not supported\n"); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | printk(KERN_ERR "rtasd: could not update surveillance\n"); | |
355 | return -1; | |
356 | } | |
357 | ||
358 | static int get_eventscan_parms(void) | |
359 | { | |
360 | struct device_node *node; | |
361 | int *ip; | |
362 | ||
363 | node = of_find_node_by_path("/rtas"); | |
364 | ||
365 | ip = (int *)get_property(node, "rtas-event-scan-rate", NULL); | |
366 | if (ip == NULL) { | |
367 | printk(KERN_ERR "rtasd: no rtas-event-scan-rate\n"); | |
368 | of_node_put(node); | |
369 | return -1; | |
370 | } | |
371 | rtas_event_scan_rate = *ip; | |
372 | DEBUG("rtas-event-scan-rate %d\n", rtas_event_scan_rate); | |
373 | ||
374 | /* Make room for the sequence number */ | |
375 | rtas_error_log_max = rtas_get_error_log_max(); | |
376 | rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int); | |
377 | ||
378 | of_node_put(node); | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void do_event_scan(int event_scan) | |
384 | { | |
385 | int error; | |
386 | do { | |
387 | memset(logdata, 0, rtas_error_log_max); | |
388 | error = rtas_call(event_scan, 4, 1, NULL, | |
389 | RTAS_EVENT_SCAN_ALL_EVENTS, 0, | |
390 | __pa(logdata), rtas_error_log_max); | |
391 | if (error == -1) { | |
392 | printk(KERN_ERR "event-scan failed\n"); | |
393 | break; | |
394 | } | |
395 | ||
396 | if (error == 0) | |
397 | pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0); | |
398 | ||
399 | } while(error == 0); | |
400 | } | |
401 | ||
402 | static void do_event_scan_all_cpus(long delay) | |
403 | { | |
404 | int cpu; | |
405 | ||
406 | lock_cpu_hotplug(); | |
407 | cpu = first_cpu(cpu_online_map); | |
408 | for (;;) { | |
409 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
410 | do_event_scan(rtas_token("event-scan")); | |
411 | set_cpus_allowed(current, CPU_MASK_ALL); | |
412 | ||
413 | /* Drop hotplug lock, and sleep for the specified delay */ | |
414 | unlock_cpu_hotplug(); | |
415 | set_current_state(TASK_INTERRUPTIBLE); | |
416 | schedule_timeout(delay); | |
417 | lock_cpu_hotplug(); | |
418 | ||
419 | cpu = next_cpu(cpu, cpu_online_map); | |
420 | if (cpu == NR_CPUS) | |
421 | break; | |
422 | } | |
423 | unlock_cpu_hotplug(); | |
424 | } | |
425 | ||
426 | static int rtasd(void *unused) | |
427 | { | |
428 | unsigned int err_type; | |
429 | int event_scan = rtas_token("event-scan"); | |
430 | int rc; | |
431 | ||
432 | daemonize("rtasd"); | |
433 | ||
434 | if (event_scan == RTAS_UNKNOWN_SERVICE || get_eventscan_parms() == -1) | |
435 | goto error; | |
436 | ||
437 | rtas_log_buf = vmalloc(rtas_error_log_buffer_max*LOG_NUMBER); | |
438 | if (!rtas_log_buf) { | |
439 | printk(KERN_ERR "rtasd: no memory\n"); | |
440 | goto error; | |
441 | } | |
442 | ||
443 | printk(KERN_ERR "RTAS daemon started\n"); | |
444 | ||
445 | DEBUG("will sleep for %d jiffies\n", (HZ*60/rtas_event_scan_rate) / 2); | |
446 | ||
447 | /* See if we have any error stored in NVRAM */ | |
448 | memset(logdata, 0, rtas_error_log_max); | |
449 | ||
450 | rc = nvram_read_error_log(logdata, rtas_error_log_max, &err_type); | |
451 | ||
452 | /* We can use rtas_log_buf now */ | |
453 | no_logging = 0; | |
454 | ||
455 | if (!rc) { | |
456 | if (err_type != ERR_FLAG_ALREADY_LOGGED) { | |
457 | pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0); | |
458 | } | |
459 | } | |
460 | ||
461 | /* First pass. */ | |
462 | do_event_scan_all_cpus(HZ); | |
463 | ||
464 | if (surveillance_timeout != -1) { | |
465 | DEBUG("enabling surveillance\n"); | |
466 | enable_surveillance(surveillance_timeout); | |
467 | DEBUG("surveillance enabled\n"); | |
468 | } | |
469 | ||
470 | /* Delay should be at least one second since some | |
471 | * machines have problems if we call event-scan too | |
472 | * quickly. */ | |
473 | for (;;) | |
474 | do_event_scan_all_cpus((HZ*60/rtas_event_scan_rate) / 2); | |
475 | ||
476 | error: | |
477 | /* Should delete proc entries */ | |
478 | return -EINVAL; | |
479 | } | |
480 | ||
481 | static int __init rtas_init(void) | |
482 | { | |
483 | struct proc_dir_entry *entry; | |
484 | ||
485 | /* No RTAS, only warn if we are on a pSeries box */ | |
486 | if (rtas_token("event-scan") == RTAS_UNKNOWN_SERVICE) { | |
487 | if (systemcfg->platform & PLATFORM_PSERIES) | |
488 | printk(KERN_ERR "rtasd: no event-scan on system\n"); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | entry = create_proc_entry("ppc64/rtas/error_log", S_IRUSR, NULL); | |
493 | if (entry) | |
494 | entry->proc_fops = &proc_rtas_log_operations; | |
495 | else | |
496 | printk(KERN_ERR "Failed to create error_log proc entry\n"); | |
497 | ||
498 | if (kernel_thread(rtasd, NULL, CLONE_FS) < 0) | |
499 | printk(KERN_ERR "Failed to start RTAS daemon\n"); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static int __init surveillance_setup(char *str) | |
505 | { | |
506 | int i; | |
507 | ||
508 | if (get_option(&str,&i)) { | |
509 | if (i >= 0 && i <= 255) | |
510 | surveillance_timeout = i; | |
511 | } | |
512 | ||
513 | return 1; | |
514 | } | |
515 | ||
516 | static int __init rtasmsgs_setup(char *str) | |
517 | { | |
518 | if (strcmp(str, "on") == 0) | |
519 | full_rtas_msgs = 1; | |
520 | else if (strcmp(str, "off") == 0) | |
521 | full_rtas_msgs = 0; | |
522 | ||
523 | return 1; | |
524 | } | |
525 | __initcall(rtas_init); | |
526 | __setup("surveillance=", surveillance_setup); | |
527 | __setup("rtasmsgs=", rtasmsgs_setup); |