Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * salinfo.c | |
3 | * | |
4 | * Creates entries in /proc/sal for various system features. | |
5 | * | |
e026cca0 | 6 | * Copyright (c) 2003, 2006 Silicon Graphics, Inc. All rights reserved. |
1da177e4 LT |
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. | |
e026cca0 KO |
30 | * |
31 | * Jan 5 2006 kaos@sgi.com | |
32 | * Handle hotplug cpus coming online. | |
33 | * Handle hotplug cpus going offline while they still have outstanding records. | |
34 | * Use the cpu_* macros consistently. | |
35 | * Replace the counting semaphore with a mutex and a test if the cpumask is non-empty. | |
36 | * Modify the locking to make the test for "work to do" an atomic operation. | |
1da177e4 LT |
37 | */ |
38 | ||
a9415644 | 39 | #include <linux/capability.h> |
e026cca0 | 40 | #include <linux/cpu.h> |
1da177e4 LT |
41 | #include <linux/types.h> |
42 | #include <linux/proc_fs.h> | |
43 | #include <linux/module.h> | |
44 | #include <linux/smp.h> | |
1da177e4 LT |
45 | #include <linux/timer.h> |
46 | #include <linux/vmalloc.h> | |
6188e10d | 47 | #include <linux/semaphore.h> |
1da177e4 | 48 | |
1da177e4 LT |
49 | #include <asm/sal.h> |
50 | #include <asm/uaccess.h> | |
51 | ||
52 | MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); | |
53 | MODULE_DESCRIPTION("/proc interface to IA-64 SAL features"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
56 | static int salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data); | |
57 | ||
58 | typedef struct { | |
59 | const char *name; /* name of the proc entry */ | |
60 | unsigned long feature; /* feature bit */ | |
61 | struct proc_dir_entry *entry; /* registered entry (removal) */ | |
62 | } salinfo_entry_t; | |
63 | ||
64 | /* | |
65 | * List {name,feature} pairs for every entry in /proc/sal/<feature> | |
66 | * that this module exports | |
67 | */ | |
68 | static salinfo_entry_t salinfo_entries[]={ | |
69 | { "bus_lock", IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, }, | |
70 | { "irq_redirection", IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, }, | |
71 | { "ipi_redirection", IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, }, | |
72 | { "itc_drift", IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, }, | |
73 | }; | |
74 | ||
75 | #define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries) | |
76 | ||
77 | static char *salinfo_log_name[] = { | |
78 | "mca", | |
79 | "init", | |
80 | "cmc", | |
81 | "cpe", | |
82 | }; | |
83 | ||
84 | static struct proc_dir_entry *salinfo_proc_entries[ | |
85 | ARRAY_SIZE(salinfo_entries) + /* /proc/sal/bus_lock */ | |
86 | ARRAY_SIZE(salinfo_log_name) + /* /proc/sal/{mca,...} */ | |
87 | (2 * ARRAY_SIZE(salinfo_log_name)) + /* /proc/sal/mca/{event,data} */ | |
88 | 1]; /* /proc/sal */ | |
89 | ||
90 | /* Some records we get ourselves, some are accessed as saved data in buffers | |
91 | * that are owned by mca.c. | |
92 | */ | |
93 | struct salinfo_data_saved { | |
94 | u8* buffer; | |
95 | u64 size; | |
96 | u64 id; | |
97 | int cpu; | |
98 | }; | |
99 | ||
100 | /* State transitions. Actions are :- | |
101 | * Write "read <cpunum>" to the data file. | |
102 | * Write "clear <cpunum>" to the data file. | |
103 | * Write "oemdata <cpunum> <offset> to the data file. | |
104 | * Read from the data file. | |
105 | * Close the data file. | |
106 | * | |
107 | * Start state is NO_DATA. | |
108 | * | |
109 | * NO_DATA | |
110 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
111 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
112 | * write "oemdata <cpunum> <offset> -> return -EINVAL. | |
113 | * read data -> return EOF. | |
114 | * close -> unchanged. Free record areas. | |
115 | * | |
116 | * LOG_RECORD | |
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 INIT/MCA/CMC/CPE record. | |
121 | * close -> unchanged. Keep record areas. | |
122 | * | |
123 | * OEMDATA | |
124 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
125 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
126 | * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA. | |
127 | * read data -> return the formatted oemdata. | |
128 | * close -> unchanged. Keep record areas. | |
129 | * | |
130 | * Closing the data file does not change the state. This allows shell scripts | |
131 | * to manipulate salinfo data, each shell redirection opens the file, does one | |
132 | * action then closes it again. The record areas are only freed at close when | |
133 | * the state is NO_DATA. | |
134 | */ | |
135 | enum salinfo_state { | |
136 | STATE_NO_DATA, | |
137 | STATE_LOG_RECORD, | |
138 | STATE_OEMDATA, | |
139 | }; | |
140 | ||
141 | struct salinfo_data { | |
e026cca0 KO |
142 | cpumask_t cpu_event; /* which cpus have outstanding events */ |
143 | struct semaphore mutex; | |
1da177e4 LT |
144 | u8 *log_buffer; |
145 | u64 log_size; | |
146 | u8 *oemdata; /* decoded oem data */ | |
147 | u64 oemdata_size; | |
148 | int open; /* single-open to prevent races */ | |
149 | u8 type; | |
150 | u8 saved_num; /* using a saved record? */ | |
151 | enum salinfo_state state :8; /* processing state */ | |
152 | u8 padding; | |
153 | int cpu_check; /* next CPU to check */ | |
154 | struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */ | |
155 | }; | |
156 | ||
157 | static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)]; | |
158 | ||
71841b8f KO |
159 | static DEFINE_SPINLOCK(data_lock); |
160 | static DEFINE_SPINLOCK(data_saved_lock); | |
1da177e4 LT |
161 | |
162 | /** salinfo_platform_oemdata - optional callback to decode oemdata from an error | |
163 | * record. | |
164 | * @sect_header: pointer to the start of the section to decode. | |
72fdbdce | 165 | * @oemdata: returns vmalloc area containing the decoded output. |
1da177e4 LT |
166 | * @oemdata_size: returns length of decoded output (strlen). |
167 | * | |
168 | * Description: If user space asks for oem data to be decoded by the kernel | |
169 | * and/or prom and the platform has set salinfo_platform_oemdata to the address | |
170 | * of a platform specific routine then call that routine. salinfo_platform_oemdata | |
171 | * vmalloc's and formats its output area, returning the address of the text | |
172 | * and its strlen. Returns 0 for success, -ve for error. The callback is | |
173 | * invoked on the cpu that generated the error record. | |
174 | */ | |
175 | int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size); | |
176 | ||
177 | struct salinfo_platform_oemdata_parms { | |
178 | const u8 *efi_guid; | |
179 | u8 **oemdata; | |
180 | u64 *oemdata_size; | |
181 | int ret; | |
182 | }; | |
183 | ||
e026cca0 KO |
184 | /* Kick the mutex that tells user space that there is work to do. Instead of |
185 | * trying to track the state of the mutex across multiple cpus, in user | |
186 | * context, interrupt context, non-maskable interrupt context and hotplug cpu, | |
187 | * it is far easier just to grab the mutex if it is free then release it. | |
188 | * | |
189 | * This routine must be called with data_saved_lock held, to make the down/up | |
190 | * operation atomic. | |
191 | */ | |
192 | static void | |
193 | salinfo_work_to_do(struct salinfo_data *data) | |
194 | { | |
195 | down_trylock(&data->mutex); | |
196 | up(&data->mutex); | |
197 | } | |
198 | ||
1da177e4 LT |
199 | static void |
200 | salinfo_platform_oemdata_cpu(void *context) | |
201 | { | |
202 | struct salinfo_platform_oemdata_parms *parms = context; | |
203 | parms->ret = salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size); | |
204 | } | |
205 | ||
206 | static void | |
207 | shift1_data_saved (struct salinfo_data *data, int shift) | |
208 | { | |
209 | memcpy(data->data_saved+shift, data->data_saved+shift+1, | |
210 | (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0])); | |
211 | memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0, | |
212 | sizeof(data->data_saved[0])); | |
213 | } | |
214 | ||
215 | /* This routine is invoked in interrupt context. Note: mca.c enables | |
216 | * interrupts before calling this code for CMC/CPE. MCA and INIT events are | |
217 | * not irq safe, do not call any routines that use spinlocks, they may deadlock. | |
218 | * MCA and INIT records are recorded, a timer event will look for any | |
219 | * outstanding events and wake up the user space code. | |
220 | * | |
221 | * The buffer passed from mca.c points to the output from ia64_log_get. This is | |
222 | * a persistent buffer but its contents can change between the interrupt and | |
223 | * when user space processes the record. Save the record id to identify | |
289d773e | 224 | * changes. If the buffer is NULL then just update the bitmap. |
1da177e4 LT |
225 | */ |
226 | void | |
227 | salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe) | |
228 | { | |
229 | struct salinfo_data *data = salinfo_data + type; | |
230 | struct salinfo_data_saved *data_saved; | |
231 | unsigned long flags = 0; | |
232 | int i; | |
233 | int saved_size = ARRAY_SIZE(data->data_saved); | |
234 | ||
235 | BUG_ON(type >= ARRAY_SIZE(salinfo_log_name)); | |
236 | ||
e026cca0 KO |
237 | if (irqsafe) |
238 | spin_lock_irqsave(&data_saved_lock, flags); | |
289d773e | 239 | if (buffer) { |
289d773e KO |
240 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { |
241 | if (!data_saved->buffer) | |
242 | break; | |
243 | } | |
244 | if (i == saved_size) { | |
245 | if (!data->saved_num) { | |
246 | shift1_data_saved(data, 0); | |
247 | data_saved = data->data_saved + saved_size - 1; | |
248 | } else | |
249 | data_saved = NULL; | |
250 | } | |
251 | if (data_saved) { | |
252 | data_saved->cpu = smp_processor_id(); | |
253 | data_saved->id = ((sal_log_record_header_t *)buffer)->id; | |
254 | data_saved->size = size; | |
255 | data_saved->buffer = buffer; | |
256 | } | |
1da177e4 | 257 | } |
e026cca0 KO |
258 | cpu_set(smp_processor_id(), data->cpu_event); |
259 | if (irqsafe) { | |
260 | salinfo_work_to_do(data); | |
261 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 LT |
262 | } |
263 | } | |
264 | ||
265 | /* Check for outstanding MCA/INIT records every minute (arbitrary) */ | |
266 | #define SALINFO_TIMER_DELAY (60*HZ) | |
267 | static struct timer_list salinfo_timer; | |
43ed3baf | 268 | extern void ia64_mlogbuf_dump(void); |
1da177e4 LT |
269 | |
270 | static void | |
271 | salinfo_timeout_check(struct salinfo_data *data) | |
272 | { | |
e026cca0 | 273 | unsigned long flags; |
1da177e4 LT |
274 | if (!data->open) |
275 | return; | |
e026cca0 KO |
276 | if (!cpus_empty(data->cpu_event)) { |
277 | spin_lock_irqsave(&data_saved_lock, flags); | |
278 | salinfo_work_to_do(data); | |
279 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 LT |
280 | } |
281 | } | |
282 | ||
e026cca0 | 283 | static void |
1da177e4 LT |
284 | salinfo_timeout (unsigned long arg) |
285 | { | |
43ed3baf | 286 | ia64_mlogbuf_dump(); |
1da177e4 LT |
287 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA); |
288 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT); | |
289 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
290 | add_timer(&salinfo_timer); | |
291 | } | |
292 | ||
293 | static int | |
294 | salinfo_event_open(struct inode *inode, struct file *file) | |
295 | { | |
296 | if (!capable(CAP_SYS_ADMIN)) | |
297 | return -EPERM; | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static ssize_t | |
302 | salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
303 | { | |
b66ffad9 | 304 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
305 | struct proc_dir_entry *entry = PDE(inode); |
306 | struct salinfo_data *data = entry->data; | |
307 | char cmd[32]; | |
308 | size_t size; | |
309 | int i, n, cpu = -1; | |
310 | ||
311 | retry: | |
e026cca0 | 312 | if (cpus_empty(data->cpu_event) && down_trylock(&data->mutex)) { |
1da177e4 LT |
313 | if (file->f_flags & O_NONBLOCK) |
314 | return -EAGAIN; | |
e026cca0 | 315 | if (down_interruptible(&data->mutex)) |
05f70395 | 316 | return -EINTR; |
1da177e4 LT |
317 | } |
318 | ||
319 | n = data->cpu_check; | |
320 | for (i = 0; i < NR_CPUS; i++) { | |
e026cca0 KO |
321 | if (cpu_isset(n, data->cpu_event)) { |
322 | if (!cpu_online(n)) { | |
323 | cpu_clear(n, data->cpu_event); | |
324 | continue; | |
325 | } | |
1da177e4 LT |
326 | cpu = n; |
327 | break; | |
328 | } | |
329 | if (++n == NR_CPUS) | |
330 | n = 0; | |
331 | } | |
332 | ||
333 | if (cpu == -1) | |
334 | goto retry; | |
335 | ||
43ed3baf HS |
336 | ia64_mlogbuf_dump(); |
337 | ||
1da177e4 LT |
338 | /* for next read, start checking at next CPU */ |
339 | data->cpu_check = cpu; | |
340 | if (++data->cpu_check == NR_CPUS) | |
341 | data->cpu_check = 0; | |
342 | ||
343 | snprintf(cmd, sizeof(cmd), "read %d\n", cpu); | |
344 | ||
345 | size = strlen(cmd); | |
346 | if (size > count) | |
347 | size = count; | |
348 | if (copy_to_user(buffer, cmd, size)) | |
349 | return -EFAULT; | |
350 | ||
351 | return size; | |
352 | } | |
353 | ||
5dfe4c96 | 354 | static const struct file_operations salinfo_event_fops = { |
1da177e4 LT |
355 | .open = salinfo_event_open, |
356 | .read = salinfo_event_read, | |
357 | }; | |
358 | ||
359 | static int | |
360 | salinfo_log_open(struct inode *inode, struct file *file) | |
361 | { | |
362 | struct proc_dir_entry *entry = PDE(inode); | |
363 | struct salinfo_data *data = entry->data; | |
364 | ||
365 | if (!capable(CAP_SYS_ADMIN)) | |
366 | return -EPERM; | |
367 | ||
368 | spin_lock(&data_lock); | |
369 | if (data->open) { | |
370 | spin_unlock(&data_lock); | |
371 | return -EBUSY; | |
372 | } | |
373 | data->open = 1; | |
374 | spin_unlock(&data_lock); | |
375 | ||
376 | if (data->state == STATE_NO_DATA && | |
377 | !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) { | |
378 | data->open = 0; | |
379 | return -ENOMEM; | |
380 | } | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static int | |
386 | salinfo_log_release(struct inode *inode, struct file *file) | |
387 | { | |
388 | struct proc_dir_entry *entry = PDE(inode); | |
389 | struct salinfo_data *data = entry->data; | |
390 | ||
391 | if (data->state == STATE_NO_DATA) { | |
392 | vfree(data->log_buffer); | |
393 | vfree(data->oemdata); | |
394 | data->log_buffer = NULL; | |
395 | data->oemdata = NULL; | |
396 | } | |
397 | spin_lock(&data_lock); | |
398 | data->open = 0; | |
399 | spin_unlock(&data_lock); | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static void | |
404 | call_on_cpu(int cpu, void (*fn)(void *), void *arg) | |
405 | { | |
e026cca0 KO |
406 | cpumask_t save_cpus_allowed = current->cpus_allowed; |
407 | cpumask_t new_cpus_allowed = cpumask_of_cpu(cpu); | |
1da177e4 LT |
408 | set_cpus_allowed(current, new_cpus_allowed); |
409 | (*fn)(arg); | |
410 | set_cpus_allowed(current, save_cpus_allowed); | |
411 | } | |
412 | ||
413 | static void | |
414 | salinfo_log_read_cpu(void *context) | |
415 | { | |
416 | struct salinfo_data *data = context; | |
417 | sal_log_record_header_t *rh; | |
418 | data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer); | |
419 | rh = (sal_log_record_header_t *)(data->log_buffer); | |
420 | /* Clear corrected errors as they are read from SAL */ | |
421 | if (rh->severity == sal_log_severity_corrected) | |
422 | ia64_sal_clear_state_info(data->type); | |
423 | } | |
424 | ||
425 | static void | |
426 | salinfo_log_new_read(int cpu, struct salinfo_data *data) | |
427 | { | |
428 | struct salinfo_data_saved *data_saved; | |
429 | unsigned long flags; | |
430 | int i; | |
431 | int saved_size = ARRAY_SIZE(data->data_saved); | |
432 | ||
433 | data->saved_num = 0; | |
434 | spin_lock_irqsave(&data_saved_lock, flags); | |
435 | retry: | |
436 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { | |
437 | if (data_saved->buffer && data_saved->cpu == cpu) { | |
438 | sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer); | |
439 | data->log_size = data_saved->size; | |
440 | memcpy(data->log_buffer, rh, data->log_size); | |
441 | barrier(); /* id check must not be moved */ | |
442 | if (rh->id == data_saved->id) { | |
443 | data->saved_num = i+1; | |
444 | break; | |
445 | } | |
446 | /* saved record changed by mca.c since interrupt, discard it */ | |
447 | shift1_data_saved(data, i); | |
448 | goto retry; | |
449 | } | |
450 | } | |
451 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
452 | ||
453 | if (!data->saved_num) | |
454 | call_on_cpu(cpu, salinfo_log_read_cpu, data); | |
455 | if (!data->log_size) { | |
e026cca0 KO |
456 | data->state = STATE_NO_DATA; |
457 | cpu_clear(cpu, data->cpu_event); | |
1da177e4 | 458 | } else { |
e026cca0 | 459 | data->state = STATE_LOG_RECORD; |
1da177e4 LT |
460 | } |
461 | } | |
462 | ||
463 | static ssize_t | |
464 | salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
465 | { | |
b66ffad9 | 466 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
467 | struct proc_dir_entry *entry = PDE(inode); |
468 | struct salinfo_data *data = entry->data; | |
469 | u8 *buf; | |
470 | u64 bufsize; | |
471 | ||
472 | if (data->state == STATE_LOG_RECORD) { | |
473 | buf = data->log_buffer; | |
474 | bufsize = data->log_size; | |
475 | } else if (data->state == STATE_OEMDATA) { | |
476 | buf = data->oemdata; | |
477 | bufsize = data->oemdata_size; | |
478 | } else { | |
479 | buf = NULL; | |
480 | bufsize = 0; | |
481 | } | |
482 | return simple_read_from_buffer(buffer, count, ppos, buf, bufsize); | |
483 | } | |
484 | ||
485 | static void | |
486 | salinfo_log_clear_cpu(void *context) | |
487 | { | |
488 | struct salinfo_data *data = context; | |
489 | ia64_sal_clear_state_info(data->type); | |
490 | } | |
491 | ||
492 | static int | |
493 | salinfo_log_clear(struct salinfo_data *data, int cpu) | |
494 | { | |
495 | sal_log_record_header_t *rh; | |
e026cca0 KO |
496 | unsigned long flags; |
497 | spin_lock_irqsave(&data_saved_lock, flags); | |
1da177e4 | 498 | data->state = STATE_NO_DATA; |
e026cca0 KO |
499 | if (!cpu_isset(cpu, data->cpu_event)) { |
500 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 | 501 | return 0; |
e026cca0 KO |
502 | } |
503 | cpu_clear(cpu, data->cpu_event); | |
1da177e4 | 504 | if (data->saved_num) { |
e026cca0 | 505 | shift1_data_saved(data, data->saved_num - 1); |
1da177e4 | 506 | data->saved_num = 0; |
1da177e4 | 507 | } |
e026cca0 | 508 | spin_unlock_irqrestore(&data_saved_lock, flags); |
1da177e4 LT |
509 | rh = (sal_log_record_header_t *)(data->log_buffer); |
510 | /* Corrected errors have already been cleared from SAL */ | |
511 | if (rh->severity != sal_log_severity_corrected) | |
512 | call_on_cpu(cpu, salinfo_log_clear_cpu, data); | |
513 | /* clearing a record may make a new record visible */ | |
514 | salinfo_log_new_read(cpu, data); | |
e026cca0 KO |
515 | if (data->state == STATE_LOG_RECORD) { |
516 | spin_lock_irqsave(&data_saved_lock, flags); | |
517 | cpu_set(cpu, data->cpu_event); | |
518 | salinfo_work_to_do(data); | |
519 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
520 | } | |
1da177e4 LT |
521 | return 0; |
522 | } | |
523 | ||
524 | static ssize_t | |
525 | salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
526 | { | |
b66ffad9 | 527 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
528 | struct proc_dir_entry *entry = PDE(inode); |
529 | struct salinfo_data *data = entry->data; | |
530 | char cmd[32]; | |
531 | size_t size; | |
532 | u32 offset; | |
533 | int cpu; | |
534 | ||
535 | size = sizeof(cmd); | |
536 | if (count < size) | |
537 | size = count; | |
538 | if (copy_from_user(cmd, buffer, size)) | |
539 | return -EFAULT; | |
540 | ||
541 | if (sscanf(cmd, "read %d", &cpu) == 1) { | |
542 | salinfo_log_new_read(cpu, data); | |
543 | } else if (sscanf(cmd, "clear %d", &cpu) == 1) { | |
544 | int ret; | |
545 | if ((ret = salinfo_log_clear(data, cpu))) | |
546 | count = ret; | |
547 | } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) { | |
548 | if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA) | |
549 | return -EINVAL; | |
550 | if (offset > data->log_size - sizeof(efi_guid_t)) | |
551 | return -EINVAL; | |
552 | data->state = STATE_OEMDATA; | |
553 | if (salinfo_platform_oemdata) { | |
554 | struct salinfo_platform_oemdata_parms parms = { | |
555 | .efi_guid = data->log_buffer + offset, | |
556 | .oemdata = &data->oemdata, | |
557 | .oemdata_size = &data->oemdata_size | |
558 | }; | |
559 | call_on_cpu(cpu, salinfo_platform_oemdata_cpu, &parms); | |
560 | if (parms.ret) | |
561 | count = parms.ret; | |
562 | } else | |
563 | data->oemdata_size = 0; | |
564 | } else | |
565 | return -EINVAL; | |
566 | ||
567 | return count; | |
568 | } | |
569 | ||
5dfe4c96 | 570 | static const struct file_operations salinfo_data_fops = { |
1da177e4 LT |
571 | .open = salinfo_log_open, |
572 | .release = salinfo_log_release, | |
573 | .read = salinfo_log_read, | |
574 | .write = salinfo_log_write, | |
575 | }; | |
576 | ||
db6a5cef | 577 | static int __cpuinit |
e026cca0 KO |
578 | salinfo_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) |
579 | { | |
580 | unsigned int i, cpu = (unsigned long)hcpu; | |
581 | unsigned long flags; | |
582 | struct salinfo_data *data; | |
583 | switch (action) { | |
584 | case CPU_ONLINE: | |
8bb78442 | 585 | case CPU_ONLINE_FROZEN: |
e026cca0 KO |
586 | spin_lock_irqsave(&data_saved_lock, flags); |
587 | for (i = 0, data = salinfo_data; | |
588 | i < ARRAY_SIZE(salinfo_data); | |
589 | ++i, ++data) { | |
590 | cpu_set(cpu, data->cpu_event); | |
591 | salinfo_work_to_do(data); | |
592 | } | |
593 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
594 | break; | |
595 | case CPU_DEAD: | |
8bb78442 | 596 | case CPU_DEAD_FROZEN: |
e026cca0 KO |
597 | spin_lock_irqsave(&data_saved_lock, flags); |
598 | for (i = 0, data = salinfo_data; | |
599 | i < ARRAY_SIZE(salinfo_data); | |
600 | ++i, ++data) { | |
601 | struct salinfo_data_saved *data_saved; | |
602 | int j; | |
603 | for (j = ARRAY_SIZE(data->data_saved) - 1, data_saved = data->data_saved + j; | |
604 | j >= 0; | |
605 | --j, --data_saved) { | |
606 | if (data_saved->buffer && data_saved->cpu == cpu) { | |
607 | shift1_data_saved(data, j); | |
608 | } | |
609 | } | |
610 | cpu_clear(cpu, data->cpu_event); | |
611 | } | |
612 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
613 | break; | |
614 | } | |
615 | return NOTIFY_OK; | |
616 | } | |
617 | ||
db6a5cef | 618 | static struct notifier_block salinfo_cpu_notifier __cpuinitdata = |
e026cca0 KO |
619 | { |
620 | .notifier_call = salinfo_cpu_callback, | |
621 | .priority = 0, | |
622 | }; | |
e026cca0 | 623 | |
1da177e4 LT |
624 | static int __init |
625 | salinfo_init(void) | |
626 | { | |
627 | struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */ | |
628 | struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */ | |
629 | struct proc_dir_entry *dir, *entry; | |
630 | struct salinfo_data *data; | |
e026cca0 | 631 | int i, j; |
1da177e4 LT |
632 | |
633 | salinfo_dir = proc_mkdir("sal", NULL); | |
634 | if (!salinfo_dir) | |
635 | return 0; | |
636 | ||
637 | for (i=0; i < NR_SALINFO_ENTRIES; i++) { | |
638 | /* pass the feature bit in question as misc data */ | |
639 | *sdir++ = create_proc_read_entry (salinfo_entries[i].name, 0, salinfo_dir, | |
640 | salinfo_read, (void *)salinfo_entries[i].feature); | |
641 | } | |
642 | ||
643 | for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) { | |
644 | data = salinfo_data + i; | |
645 | data->type = i; | |
e026cca0 | 646 | init_MUTEX(&data->mutex); |
1da177e4 LT |
647 | dir = proc_mkdir(salinfo_log_name[i], salinfo_dir); |
648 | if (!dir) | |
649 | continue; | |
650 | ||
e2363768 DL |
651 | entry = proc_create_data("event", S_IRUSR, dir, |
652 | &salinfo_event_fops, data); | |
1da177e4 LT |
653 | if (!entry) |
654 | continue; | |
1da177e4 LT |
655 | *sdir++ = entry; |
656 | ||
e2363768 DL |
657 | entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir, |
658 | &salinfo_data_fops, data); | |
1da177e4 LT |
659 | if (!entry) |
660 | continue; | |
1da177e4 LT |
661 | *sdir++ = entry; |
662 | ||
663 | /* we missed any events before now */ | |
e026cca0 KO |
664 | for_each_online_cpu(j) |
665 | cpu_set(j, data->cpu_event); | |
1da177e4 LT |
666 | |
667 | *sdir++ = dir; | |
668 | } | |
669 | ||
670 | *sdir++ = salinfo_dir; | |
671 | ||
672 | init_timer(&salinfo_timer); | |
673 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
674 | salinfo_timer.function = &salinfo_timeout; | |
675 | add_timer(&salinfo_timer); | |
676 | ||
5a67e4c5 | 677 | register_hotcpu_notifier(&salinfo_cpu_notifier); |
e026cca0 | 678 | |
1da177e4 LT |
679 | return 0; |
680 | } | |
681 | ||
682 | /* | |
683 | * 'data' contains an integer that corresponds to the feature we're | |
684 | * testing | |
685 | */ | |
686 | static int | |
687 | salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data) | |
688 | { | |
689 | int len = 0; | |
690 | ||
691 | len = sprintf(page, (sal_platform_features & (unsigned long)data) ? "1\n" : "0\n"); | |
692 | ||
693 | if (len <= off+count) *eof = 1; | |
694 | ||
695 | *start = page + off; | |
696 | len -= off; | |
697 | ||
698 | if (len>count) len = count; | |
699 | if (len<0) len = 0; | |
700 | ||
701 | return len; | |
702 | } | |
703 | ||
704 | module_init(salinfo_init); |