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1da177e4 LT |
1 | /* |
2 | * salinfo.c | |
3 | * | |
4 | * Creates entries in /proc/sal for various system features. | |
5 | * | |
6 | * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. | |
7 | * Copyright (c) 2003 Hewlett-Packard Co | |
8 | * Bjorn Helgaas <bjorn.helgaas@hp.com> | |
9 | * | |
10 | * 10/30/2001 jbarnes@sgi.com copied much of Stephane's palinfo | |
11 | * code to create this file | |
12 | * Oct 23 2003 kaos@sgi.com | |
13 | * Replace IPI with set_cpus_allowed() to read a record from the required cpu. | |
14 | * Redesign salinfo log processing to separate interrupt and user space | |
15 | * contexts. | |
16 | * Cache the record across multi-block reads from user space. | |
17 | * Support > 64 cpus. | |
18 | * Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module. | |
19 | * | |
20 | * Jan 28 2004 kaos@sgi.com | |
21 | * Periodically check for outstanding MCA or INIT records. | |
22 | * | |
23 | * Dec 5 2004 kaos@sgi.com | |
24 | * Standardize which records are cleared automatically. | |
289d773e KO |
25 | * |
26 | * Aug 18 2005 kaos@sgi.com | |
27 | * mca.c may not pass a buffer, a NULL buffer just indicates that a new | |
28 | * record is available in SAL. | |
29 | * Replace some NR_CPUS by cpus_online, for hotplug cpu. | |
1da177e4 LT |
30 | */ |
31 | ||
a9415644 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/types.h> |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/smp.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/timer.h> | |
39 | #include <linux/vmalloc.h> | |
40 | ||
41 | #include <asm/semaphore.h> | |
42 | #include <asm/sal.h> | |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); | |
46 | MODULE_DESCRIPTION("/proc interface to IA-64 SAL features"); | |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
49 | static int salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data); | |
50 | ||
51 | typedef struct { | |
52 | const char *name; /* name of the proc entry */ | |
53 | unsigned long feature; /* feature bit */ | |
54 | struct proc_dir_entry *entry; /* registered entry (removal) */ | |
55 | } salinfo_entry_t; | |
56 | ||
57 | /* | |
58 | * List {name,feature} pairs for every entry in /proc/sal/<feature> | |
59 | * that this module exports | |
60 | */ | |
61 | static salinfo_entry_t salinfo_entries[]={ | |
62 | { "bus_lock", IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, }, | |
63 | { "irq_redirection", IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, }, | |
64 | { "ipi_redirection", IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, }, | |
65 | { "itc_drift", IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, }, | |
66 | }; | |
67 | ||
68 | #define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries) | |
69 | ||
70 | static char *salinfo_log_name[] = { | |
71 | "mca", | |
72 | "init", | |
73 | "cmc", | |
74 | "cpe", | |
75 | }; | |
76 | ||
77 | static struct proc_dir_entry *salinfo_proc_entries[ | |
78 | ARRAY_SIZE(salinfo_entries) + /* /proc/sal/bus_lock */ | |
79 | ARRAY_SIZE(salinfo_log_name) + /* /proc/sal/{mca,...} */ | |
80 | (2 * ARRAY_SIZE(salinfo_log_name)) + /* /proc/sal/mca/{event,data} */ | |
81 | 1]; /* /proc/sal */ | |
82 | ||
83 | /* Some records we get ourselves, some are accessed as saved data in buffers | |
84 | * that are owned by mca.c. | |
85 | */ | |
86 | struct salinfo_data_saved { | |
87 | u8* buffer; | |
88 | u64 size; | |
89 | u64 id; | |
90 | int cpu; | |
91 | }; | |
92 | ||
93 | /* State transitions. Actions are :- | |
94 | * Write "read <cpunum>" to the data file. | |
95 | * Write "clear <cpunum>" to the data file. | |
96 | * Write "oemdata <cpunum> <offset> to the data file. | |
97 | * Read from the data file. | |
98 | * Close the data file. | |
99 | * | |
100 | * Start state is NO_DATA. | |
101 | * | |
102 | * NO_DATA | |
103 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
104 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
105 | * write "oemdata <cpunum> <offset> -> return -EINVAL. | |
106 | * read data -> return EOF. | |
107 | * close -> unchanged. Free record areas. | |
108 | * | |
109 | * LOG_RECORD | |
110 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
111 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
112 | * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA. | |
113 | * read data -> return the INIT/MCA/CMC/CPE record. | |
114 | * close -> unchanged. Keep record areas. | |
115 | * | |
116 | * OEMDATA | |
117 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
118 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
119 | * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA. | |
120 | * read data -> return the formatted oemdata. | |
121 | * close -> unchanged. Keep record areas. | |
122 | * | |
123 | * Closing the data file does not change the state. This allows shell scripts | |
124 | * to manipulate salinfo data, each shell redirection opens the file, does one | |
125 | * action then closes it again. The record areas are only freed at close when | |
126 | * the state is NO_DATA. | |
127 | */ | |
128 | enum salinfo_state { | |
129 | STATE_NO_DATA, | |
130 | STATE_LOG_RECORD, | |
131 | STATE_OEMDATA, | |
132 | }; | |
133 | ||
134 | struct salinfo_data { | |
135 | volatile cpumask_t cpu_event; /* which cpus have outstanding events */ | |
136 | struct semaphore sem; /* count of cpus with outstanding events (bits set in cpu_event) */ | |
137 | u8 *log_buffer; | |
138 | u64 log_size; | |
139 | u8 *oemdata; /* decoded oem data */ | |
140 | u64 oemdata_size; | |
141 | int open; /* single-open to prevent races */ | |
142 | u8 type; | |
143 | u8 saved_num; /* using a saved record? */ | |
144 | enum salinfo_state state :8; /* processing state */ | |
145 | u8 padding; | |
146 | int cpu_check; /* next CPU to check */ | |
147 | struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */ | |
148 | }; | |
149 | ||
150 | static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)]; | |
151 | ||
71841b8f KO |
152 | static DEFINE_SPINLOCK(data_lock); |
153 | static DEFINE_SPINLOCK(data_saved_lock); | |
1da177e4 LT |
154 | |
155 | /** salinfo_platform_oemdata - optional callback to decode oemdata from an error | |
156 | * record. | |
157 | * @sect_header: pointer to the start of the section to decode. | |
158 | * @oemdata: returns vmalloc area containing the decded output. | |
159 | * @oemdata_size: returns length of decoded output (strlen). | |
160 | * | |
161 | * Description: If user space asks for oem data to be decoded by the kernel | |
162 | * and/or prom and the platform has set salinfo_platform_oemdata to the address | |
163 | * of a platform specific routine then call that routine. salinfo_platform_oemdata | |
164 | * vmalloc's and formats its output area, returning the address of the text | |
165 | * and its strlen. Returns 0 for success, -ve for error. The callback is | |
166 | * invoked on the cpu that generated the error record. | |
167 | */ | |
168 | int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size); | |
169 | ||
170 | struct salinfo_platform_oemdata_parms { | |
171 | const u8 *efi_guid; | |
172 | u8 **oemdata; | |
173 | u64 *oemdata_size; | |
174 | int ret; | |
175 | }; | |
176 | ||
177 | static void | |
178 | salinfo_platform_oemdata_cpu(void *context) | |
179 | { | |
180 | struct salinfo_platform_oemdata_parms *parms = context; | |
181 | parms->ret = salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size); | |
182 | } | |
183 | ||
184 | static void | |
185 | shift1_data_saved (struct salinfo_data *data, int shift) | |
186 | { | |
187 | memcpy(data->data_saved+shift, data->data_saved+shift+1, | |
188 | (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0])); | |
189 | memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0, | |
190 | sizeof(data->data_saved[0])); | |
191 | } | |
192 | ||
193 | /* This routine is invoked in interrupt context. Note: mca.c enables | |
194 | * interrupts before calling this code for CMC/CPE. MCA and INIT events are | |
195 | * not irq safe, do not call any routines that use spinlocks, they may deadlock. | |
196 | * MCA and INIT records are recorded, a timer event will look for any | |
197 | * outstanding events and wake up the user space code. | |
198 | * | |
199 | * The buffer passed from mca.c points to the output from ia64_log_get. This is | |
200 | * a persistent buffer but its contents can change between the interrupt and | |
201 | * when user space processes the record. Save the record id to identify | |
289d773e | 202 | * changes. If the buffer is NULL then just update the bitmap. |
1da177e4 LT |
203 | */ |
204 | void | |
205 | salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe) | |
206 | { | |
207 | struct salinfo_data *data = salinfo_data + type; | |
208 | struct salinfo_data_saved *data_saved; | |
209 | unsigned long flags = 0; | |
210 | int i; | |
211 | int saved_size = ARRAY_SIZE(data->data_saved); | |
212 | ||
213 | BUG_ON(type >= ARRAY_SIZE(salinfo_log_name)); | |
214 | ||
289d773e KO |
215 | if (buffer) { |
216 | if (irqsafe) | |
217 | spin_lock_irqsave(&data_saved_lock, flags); | |
218 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { | |
219 | if (!data_saved->buffer) | |
220 | break; | |
221 | } | |
222 | if (i == saved_size) { | |
223 | if (!data->saved_num) { | |
224 | shift1_data_saved(data, 0); | |
225 | data_saved = data->data_saved + saved_size - 1; | |
226 | } else | |
227 | data_saved = NULL; | |
228 | } | |
229 | if (data_saved) { | |
230 | data_saved->cpu = smp_processor_id(); | |
231 | data_saved->id = ((sal_log_record_header_t *)buffer)->id; | |
232 | data_saved->size = size; | |
233 | data_saved->buffer = buffer; | |
234 | } | |
235 | if (irqsafe) | |
236 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 | 237 | } |
1da177e4 LT |
238 | |
239 | if (!test_and_set_bit(smp_processor_id(), &data->cpu_event)) { | |
240 | if (irqsafe) | |
241 | up(&data->sem); | |
242 | } | |
243 | } | |
244 | ||
245 | /* Check for outstanding MCA/INIT records every minute (arbitrary) */ | |
246 | #define SALINFO_TIMER_DELAY (60*HZ) | |
247 | static struct timer_list salinfo_timer; | |
248 | ||
249 | static void | |
250 | salinfo_timeout_check(struct salinfo_data *data) | |
251 | { | |
252 | int i; | |
253 | if (!data->open) | |
254 | return; | |
289d773e | 255 | for_each_online_cpu(i) { |
1da177e4 LT |
256 | if (test_bit(i, &data->cpu_event)) { |
257 | /* double up() is not a problem, user space will see no | |
258 | * records for the additional "events". | |
259 | */ | |
260 | up(&data->sem); | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | static void | |
266 | salinfo_timeout (unsigned long arg) | |
267 | { | |
268 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA); | |
269 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT); | |
270 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
271 | add_timer(&salinfo_timer); | |
272 | } | |
273 | ||
274 | static int | |
275 | salinfo_event_open(struct inode *inode, struct file *file) | |
276 | { | |
277 | if (!capable(CAP_SYS_ADMIN)) | |
278 | return -EPERM; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static ssize_t | |
283 | salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
284 | { | |
285 | struct inode *inode = file->f_dentry->d_inode; | |
286 | struct proc_dir_entry *entry = PDE(inode); | |
287 | struct salinfo_data *data = entry->data; | |
288 | char cmd[32]; | |
289 | size_t size; | |
290 | int i, n, cpu = -1; | |
291 | ||
292 | retry: | |
293 | if (down_trylock(&data->sem)) { | |
294 | if (file->f_flags & O_NONBLOCK) | |
295 | return -EAGAIN; | |
296 | if (down_interruptible(&data->sem)) | |
05f70395 | 297 | return -EINTR; |
1da177e4 LT |
298 | } |
299 | ||
300 | n = data->cpu_check; | |
301 | for (i = 0; i < NR_CPUS; i++) { | |
289d773e | 302 | if (test_bit(n, &data->cpu_event) && cpu_online(n)) { |
1da177e4 LT |
303 | cpu = n; |
304 | break; | |
305 | } | |
306 | if (++n == NR_CPUS) | |
307 | n = 0; | |
308 | } | |
309 | ||
310 | if (cpu == -1) | |
311 | goto retry; | |
312 | ||
313 | /* events are sticky until the user says "clear" */ | |
314 | up(&data->sem); | |
315 | ||
316 | /* for next read, start checking at next CPU */ | |
317 | data->cpu_check = cpu; | |
318 | if (++data->cpu_check == NR_CPUS) | |
319 | data->cpu_check = 0; | |
320 | ||
321 | snprintf(cmd, sizeof(cmd), "read %d\n", cpu); | |
322 | ||
323 | size = strlen(cmd); | |
324 | if (size > count) | |
325 | size = count; | |
326 | if (copy_to_user(buffer, cmd, size)) | |
327 | return -EFAULT; | |
328 | ||
329 | return size; | |
330 | } | |
331 | ||
332 | static struct file_operations salinfo_event_fops = { | |
333 | .open = salinfo_event_open, | |
334 | .read = salinfo_event_read, | |
335 | }; | |
336 | ||
337 | static int | |
338 | salinfo_log_open(struct inode *inode, struct file *file) | |
339 | { | |
340 | struct proc_dir_entry *entry = PDE(inode); | |
341 | struct salinfo_data *data = entry->data; | |
342 | ||
343 | if (!capable(CAP_SYS_ADMIN)) | |
344 | return -EPERM; | |
345 | ||
346 | spin_lock(&data_lock); | |
347 | if (data->open) { | |
348 | spin_unlock(&data_lock); | |
349 | return -EBUSY; | |
350 | } | |
351 | data->open = 1; | |
352 | spin_unlock(&data_lock); | |
353 | ||
354 | if (data->state == STATE_NO_DATA && | |
355 | !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) { | |
356 | data->open = 0; | |
357 | return -ENOMEM; | |
358 | } | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static int | |
364 | salinfo_log_release(struct inode *inode, struct file *file) | |
365 | { | |
366 | struct proc_dir_entry *entry = PDE(inode); | |
367 | struct salinfo_data *data = entry->data; | |
368 | ||
369 | if (data->state == STATE_NO_DATA) { | |
370 | vfree(data->log_buffer); | |
371 | vfree(data->oemdata); | |
372 | data->log_buffer = NULL; | |
373 | data->oemdata = NULL; | |
374 | } | |
375 | spin_lock(&data_lock); | |
376 | data->open = 0; | |
377 | spin_unlock(&data_lock); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static void | |
382 | call_on_cpu(int cpu, void (*fn)(void *), void *arg) | |
383 | { | |
384 | cpumask_t save_cpus_allowed, new_cpus_allowed; | |
385 | memcpy(&save_cpus_allowed, ¤t->cpus_allowed, sizeof(save_cpus_allowed)); | |
386 | memset(&new_cpus_allowed, 0, sizeof(new_cpus_allowed)); | |
387 | set_bit(cpu, &new_cpus_allowed); | |
388 | set_cpus_allowed(current, new_cpus_allowed); | |
389 | (*fn)(arg); | |
390 | set_cpus_allowed(current, save_cpus_allowed); | |
391 | } | |
392 | ||
393 | static void | |
394 | salinfo_log_read_cpu(void *context) | |
395 | { | |
396 | struct salinfo_data *data = context; | |
397 | sal_log_record_header_t *rh; | |
398 | data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer); | |
399 | rh = (sal_log_record_header_t *)(data->log_buffer); | |
400 | /* Clear corrected errors as they are read from SAL */ | |
401 | if (rh->severity == sal_log_severity_corrected) | |
402 | ia64_sal_clear_state_info(data->type); | |
403 | } | |
404 | ||
405 | static void | |
406 | salinfo_log_new_read(int cpu, struct salinfo_data *data) | |
407 | { | |
408 | struct salinfo_data_saved *data_saved; | |
409 | unsigned long flags; | |
410 | int i; | |
411 | int saved_size = ARRAY_SIZE(data->data_saved); | |
412 | ||
413 | data->saved_num = 0; | |
414 | spin_lock_irqsave(&data_saved_lock, flags); | |
415 | retry: | |
416 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { | |
417 | if (data_saved->buffer && data_saved->cpu == cpu) { | |
418 | sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer); | |
419 | data->log_size = data_saved->size; | |
420 | memcpy(data->log_buffer, rh, data->log_size); | |
421 | barrier(); /* id check must not be moved */ | |
422 | if (rh->id == data_saved->id) { | |
423 | data->saved_num = i+1; | |
424 | break; | |
425 | } | |
426 | /* saved record changed by mca.c since interrupt, discard it */ | |
427 | shift1_data_saved(data, i); | |
428 | goto retry; | |
429 | } | |
430 | } | |
431 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
432 | ||
433 | if (!data->saved_num) | |
434 | call_on_cpu(cpu, salinfo_log_read_cpu, data); | |
435 | if (!data->log_size) { | |
436 | data->state = STATE_NO_DATA; | |
437 | clear_bit(cpu, &data->cpu_event); | |
438 | } else { | |
439 | data->state = STATE_LOG_RECORD; | |
440 | } | |
441 | } | |
442 | ||
443 | static ssize_t | |
444 | salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
445 | { | |
446 | struct inode *inode = file->f_dentry->d_inode; | |
447 | struct proc_dir_entry *entry = PDE(inode); | |
448 | struct salinfo_data *data = entry->data; | |
449 | u8 *buf; | |
450 | u64 bufsize; | |
451 | ||
452 | if (data->state == STATE_LOG_RECORD) { | |
453 | buf = data->log_buffer; | |
454 | bufsize = data->log_size; | |
455 | } else if (data->state == STATE_OEMDATA) { | |
456 | buf = data->oemdata; | |
457 | bufsize = data->oemdata_size; | |
458 | } else { | |
459 | buf = NULL; | |
460 | bufsize = 0; | |
461 | } | |
462 | return simple_read_from_buffer(buffer, count, ppos, buf, bufsize); | |
463 | } | |
464 | ||
465 | static void | |
466 | salinfo_log_clear_cpu(void *context) | |
467 | { | |
468 | struct salinfo_data *data = context; | |
469 | ia64_sal_clear_state_info(data->type); | |
470 | } | |
471 | ||
472 | static int | |
473 | salinfo_log_clear(struct salinfo_data *data, int cpu) | |
474 | { | |
475 | sal_log_record_header_t *rh; | |
476 | data->state = STATE_NO_DATA; | |
477 | if (!test_bit(cpu, &data->cpu_event)) | |
478 | return 0; | |
479 | down(&data->sem); | |
480 | clear_bit(cpu, &data->cpu_event); | |
481 | if (data->saved_num) { | |
482 | unsigned long flags; | |
483 | spin_lock_irqsave(&data_saved_lock, flags); | |
484 | shift1_data_saved(data, data->saved_num - 1 ); | |
485 | data->saved_num = 0; | |
486 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
487 | } | |
488 | rh = (sal_log_record_header_t *)(data->log_buffer); | |
489 | /* Corrected errors have already been cleared from SAL */ | |
490 | if (rh->severity != sal_log_severity_corrected) | |
491 | call_on_cpu(cpu, salinfo_log_clear_cpu, data); | |
492 | /* clearing a record may make a new record visible */ | |
493 | salinfo_log_new_read(cpu, data); | |
494 | if (data->state == STATE_LOG_RECORD && | |
495 | !test_and_set_bit(cpu, &data->cpu_event)) | |
496 | up(&data->sem); | |
497 | return 0; | |
498 | } | |
499 | ||
500 | static ssize_t | |
501 | salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
502 | { | |
503 | struct inode *inode = file->f_dentry->d_inode; | |
504 | struct proc_dir_entry *entry = PDE(inode); | |
505 | struct salinfo_data *data = entry->data; | |
506 | char cmd[32]; | |
507 | size_t size; | |
508 | u32 offset; | |
509 | int cpu; | |
510 | ||
511 | size = sizeof(cmd); | |
512 | if (count < size) | |
513 | size = count; | |
514 | if (copy_from_user(cmd, buffer, size)) | |
515 | return -EFAULT; | |
516 | ||
517 | if (sscanf(cmd, "read %d", &cpu) == 1) { | |
518 | salinfo_log_new_read(cpu, data); | |
519 | } else if (sscanf(cmd, "clear %d", &cpu) == 1) { | |
520 | int ret; | |
521 | if ((ret = salinfo_log_clear(data, cpu))) | |
522 | count = ret; | |
523 | } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) { | |
524 | if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA) | |
525 | return -EINVAL; | |
526 | if (offset > data->log_size - sizeof(efi_guid_t)) | |
527 | return -EINVAL; | |
528 | data->state = STATE_OEMDATA; | |
529 | if (salinfo_platform_oemdata) { | |
530 | struct salinfo_platform_oemdata_parms parms = { | |
531 | .efi_guid = data->log_buffer + offset, | |
532 | .oemdata = &data->oemdata, | |
533 | .oemdata_size = &data->oemdata_size | |
534 | }; | |
535 | call_on_cpu(cpu, salinfo_platform_oemdata_cpu, &parms); | |
536 | if (parms.ret) | |
537 | count = parms.ret; | |
538 | } else | |
539 | data->oemdata_size = 0; | |
540 | } else | |
541 | return -EINVAL; | |
542 | ||
543 | return count; | |
544 | } | |
545 | ||
546 | static struct file_operations salinfo_data_fops = { | |
547 | .open = salinfo_log_open, | |
548 | .release = salinfo_log_release, | |
549 | .read = salinfo_log_read, | |
550 | .write = salinfo_log_write, | |
551 | }; | |
552 | ||
553 | static int __init | |
554 | salinfo_init(void) | |
555 | { | |
556 | struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */ | |
557 | struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */ | |
558 | struct proc_dir_entry *dir, *entry; | |
559 | struct salinfo_data *data; | |
560 | int i, j, online; | |
561 | ||
562 | salinfo_dir = proc_mkdir("sal", NULL); | |
563 | if (!salinfo_dir) | |
564 | return 0; | |
565 | ||
566 | for (i=0; i < NR_SALINFO_ENTRIES; i++) { | |
567 | /* pass the feature bit in question as misc data */ | |
568 | *sdir++ = create_proc_read_entry (salinfo_entries[i].name, 0, salinfo_dir, | |
569 | salinfo_read, (void *)salinfo_entries[i].feature); | |
570 | } | |
571 | ||
572 | for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) { | |
573 | data = salinfo_data + i; | |
574 | data->type = i; | |
575 | sema_init(&data->sem, 0); | |
576 | dir = proc_mkdir(salinfo_log_name[i], salinfo_dir); | |
577 | if (!dir) | |
578 | continue; | |
579 | ||
580 | entry = create_proc_entry("event", S_IRUSR, dir); | |
581 | if (!entry) | |
582 | continue; | |
583 | entry->data = data; | |
584 | entry->proc_fops = &salinfo_event_fops; | |
585 | *sdir++ = entry; | |
586 | ||
587 | entry = create_proc_entry("data", S_IRUSR | S_IWUSR, dir); | |
588 | if (!entry) | |
589 | continue; | |
590 | entry->data = data; | |
591 | entry->proc_fops = &salinfo_data_fops; | |
592 | *sdir++ = entry; | |
593 | ||
594 | /* we missed any events before now */ | |
595 | online = 0; | |
289d773e KO |
596 | for_each_online_cpu(j) { |
597 | set_bit(j, &data->cpu_event); | |
598 | ++online; | |
599 | } | |
1da177e4 LT |
600 | sema_init(&data->sem, online); |
601 | ||
602 | *sdir++ = dir; | |
603 | } | |
604 | ||
605 | *sdir++ = salinfo_dir; | |
606 | ||
607 | init_timer(&salinfo_timer); | |
608 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
609 | salinfo_timer.function = &salinfo_timeout; | |
610 | add_timer(&salinfo_timer); | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | /* | |
616 | * 'data' contains an integer that corresponds to the feature we're | |
617 | * testing | |
618 | */ | |
619 | static int | |
620 | salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data) | |
621 | { | |
622 | int len = 0; | |
623 | ||
624 | len = sprintf(page, (sal_platform_features & (unsigned long)data) ? "1\n" : "0\n"); | |
625 | ||
626 | if (len <= off+count) *eof = 1; | |
627 | ||
628 | *start = page + off; | |
629 | len -= off; | |
630 | ||
631 | if (len>count) len = count; | |
632 | if (len<0) len = 0; | |
633 | ||
634 | return len; | |
635 | } | |
636 | ||
637 | module_init(salinfo_init); |