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> | |
45 | #include <linux/smp_lock.h> | |
46 | #include <linux/timer.h> | |
47 | #include <linux/vmalloc.h> | |
48 | ||
49 | #include <asm/semaphore.h> | |
50 | #include <asm/sal.h> | |
51 | #include <asm/uaccess.h> | |
52 | ||
53 | MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); | |
54 | MODULE_DESCRIPTION("/proc interface to IA-64 SAL features"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | static int salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data); | |
58 | ||
59 | typedef struct { | |
60 | const char *name; /* name of the proc entry */ | |
61 | unsigned long feature; /* feature bit */ | |
62 | struct proc_dir_entry *entry; /* registered entry (removal) */ | |
63 | } salinfo_entry_t; | |
64 | ||
65 | /* | |
66 | * List {name,feature} pairs for every entry in /proc/sal/<feature> | |
67 | * that this module exports | |
68 | */ | |
69 | static salinfo_entry_t salinfo_entries[]={ | |
70 | { "bus_lock", IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, }, | |
71 | { "irq_redirection", IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, }, | |
72 | { "ipi_redirection", IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, }, | |
73 | { "itc_drift", IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, }, | |
74 | }; | |
75 | ||
76 | #define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries) | |
77 | ||
78 | static char *salinfo_log_name[] = { | |
79 | "mca", | |
80 | "init", | |
81 | "cmc", | |
82 | "cpe", | |
83 | }; | |
84 | ||
85 | static struct proc_dir_entry *salinfo_proc_entries[ | |
86 | ARRAY_SIZE(salinfo_entries) + /* /proc/sal/bus_lock */ | |
87 | ARRAY_SIZE(salinfo_log_name) + /* /proc/sal/{mca,...} */ | |
88 | (2 * ARRAY_SIZE(salinfo_log_name)) + /* /proc/sal/mca/{event,data} */ | |
89 | 1]; /* /proc/sal */ | |
90 | ||
91 | /* Some records we get ourselves, some are accessed as saved data in buffers | |
92 | * that are owned by mca.c. | |
93 | */ | |
94 | struct salinfo_data_saved { | |
95 | u8* buffer; | |
96 | u64 size; | |
97 | u64 id; | |
98 | int cpu; | |
99 | }; | |
100 | ||
101 | /* State transitions. Actions are :- | |
102 | * Write "read <cpunum>" to the data file. | |
103 | * Write "clear <cpunum>" to the data file. | |
104 | * Write "oemdata <cpunum> <offset> to the data file. | |
105 | * Read from the data file. | |
106 | * Close the data file. | |
107 | * | |
108 | * Start state is NO_DATA. | |
109 | * | |
110 | * NO_DATA | |
111 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
112 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
113 | * write "oemdata <cpunum> <offset> -> return -EINVAL. | |
114 | * read data -> return EOF. | |
115 | * close -> unchanged. Free record areas. | |
116 | * | |
117 | * LOG_RECORD | |
118 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
119 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
120 | * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA. | |
121 | * read data -> return the INIT/MCA/CMC/CPE record. | |
122 | * close -> unchanged. Keep record areas. | |
123 | * | |
124 | * OEMDATA | |
125 | * write "read <cpunum>" -> NO_DATA or LOG_RECORD. | |
126 | * write "clear <cpunum>" -> NO_DATA or LOG_RECORD. | |
127 | * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA. | |
128 | * read data -> return the formatted oemdata. | |
129 | * close -> unchanged. Keep record areas. | |
130 | * | |
131 | * Closing the data file does not change the state. This allows shell scripts | |
132 | * to manipulate salinfo data, each shell redirection opens the file, does one | |
133 | * action then closes it again. The record areas are only freed at close when | |
134 | * the state is NO_DATA. | |
135 | */ | |
136 | enum salinfo_state { | |
137 | STATE_NO_DATA, | |
138 | STATE_LOG_RECORD, | |
139 | STATE_OEMDATA, | |
140 | }; | |
141 | ||
142 | struct salinfo_data { | |
e026cca0 KO |
143 | cpumask_t cpu_event; /* which cpus have outstanding events */ |
144 | struct semaphore mutex; | |
1da177e4 LT |
145 | u8 *log_buffer; |
146 | u64 log_size; | |
147 | u8 *oemdata; /* decoded oem data */ | |
148 | u64 oemdata_size; | |
149 | int open; /* single-open to prevent races */ | |
150 | u8 type; | |
151 | u8 saved_num; /* using a saved record? */ | |
152 | enum salinfo_state state :8; /* processing state */ | |
153 | u8 padding; | |
154 | int cpu_check; /* next CPU to check */ | |
155 | struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */ | |
156 | }; | |
157 | ||
158 | static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)]; | |
159 | ||
71841b8f KO |
160 | static DEFINE_SPINLOCK(data_lock); |
161 | static DEFINE_SPINLOCK(data_saved_lock); | |
1da177e4 LT |
162 | |
163 | /** salinfo_platform_oemdata - optional callback to decode oemdata from an error | |
164 | * record. | |
165 | * @sect_header: pointer to the start of the section to decode. | |
166 | * @oemdata: returns vmalloc area containing the decded output. | |
167 | * @oemdata_size: returns length of decoded output (strlen). | |
168 | * | |
169 | * Description: If user space asks for oem data to be decoded by the kernel | |
170 | * and/or prom and the platform has set salinfo_platform_oemdata to the address | |
171 | * of a platform specific routine then call that routine. salinfo_platform_oemdata | |
172 | * vmalloc's and formats its output area, returning the address of the text | |
173 | * and its strlen. Returns 0 for success, -ve for error. The callback is | |
174 | * invoked on the cpu that generated the error record. | |
175 | */ | |
176 | int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size); | |
177 | ||
178 | struct salinfo_platform_oemdata_parms { | |
179 | const u8 *efi_guid; | |
180 | u8 **oemdata; | |
181 | u64 *oemdata_size; | |
182 | int ret; | |
183 | }; | |
184 | ||
e026cca0 KO |
185 | /* Kick the mutex that tells user space that there is work to do. Instead of |
186 | * trying to track the state of the mutex across multiple cpus, in user | |
187 | * context, interrupt context, non-maskable interrupt context and hotplug cpu, | |
188 | * it is far easier just to grab the mutex if it is free then release it. | |
189 | * | |
190 | * This routine must be called with data_saved_lock held, to make the down/up | |
191 | * operation atomic. | |
192 | */ | |
193 | static void | |
194 | salinfo_work_to_do(struct salinfo_data *data) | |
195 | { | |
196 | down_trylock(&data->mutex); | |
197 | up(&data->mutex); | |
198 | } | |
199 | ||
1da177e4 LT |
200 | static void |
201 | salinfo_platform_oemdata_cpu(void *context) | |
202 | { | |
203 | struct salinfo_platform_oemdata_parms *parms = context; | |
204 | parms->ret = salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size); | |
205 | } | |
206 | ||
207 | static void | |
208 | shift1_data_saved (struct salinfo_data *data, int shift) | |
209 | { | |
210 | memcpy(data->data_saved+shift, data->data_saved+shift+1, | |
211 | (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0])); | |
212 | memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0, | |
213 | sizeof(data->data_saved[0])); | |
214 | } | |
215 | ||
216 | /* This routine is invoked in interrupt context. Note: mca.c enables | |
217 | * interrupts before calling this code for CMC/CPE. MCA and INIT events are | |
218 | * not irq safe, do not call any routines that use spinlocks, they may deadlock. | |
219 | * MCA and INIT records are recorded, a timer event will look for any | |
220 | * outstanding events and wake up the user space code. | |
221 | * | |
222 | * The buffer passed from mca.c points to the output from ia64_log_get. This is | |
223 | * a persistent buffer but its contents can change between the interrupt and | |
224 | * when user space processes the record. Save the record id to identify | |
289d773e | 225 | * changes. If the buffer is NULL then just update the bitmap. |
1da177e4 LT |
226 | */ |
227 | void | |
228 | salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe) | |
229 | { | |
230 | struct salinfo_data *data = salinfo_data + type; | |
231 | struct salinfo_data_saved *data_saved; | |
232 | unsigned long flags = 0; | |
233 | int i; | |
234 | int saved_size = ARRAY_SIZE(data->data_saved); | |
235 | ||
236 | BUG_ON(type >= ARRAY_SIZE(salinfo_log_name)); | |
237 | ||
e026cca0 KO |
238 | if (irqsafe) |
239 | spin_lock_irqsave(&data_saved_lock, flags); | |
289d773e | 240 | if (buffer) { |
289d773e KO |
241 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { |
242 | if (!data_saved->buffer) | |
243 | break; | |
244 | } | |
245 | if (i == saved_size) { | |
246 | if (!data->saved_num) { | |
247 | shift1_data_saved(data, 0); | |
248 | data_saved = data->data_saved + saved_size - 1; | |
249 | } else | |
250 | data_saved = NULL; | |
251 | } | |
252 | if (data_saved) { | |
253 | data_saved->cpu = smp_processor_id(); | |
254 | data_saved->id = ((sal_log_record_header_t *)buffer)->id; | |
255 | data_saved->size = size; | |
256 | data_saved->buffer = buffer; | |
257 | } | |
1da177e4 | 258 | } |
e026cca0 KO |
259 | cpu_set(smp_processor_id(), data->cpu_event); |
260 | if (irqsafe) { | |
261 | salinfo_work_to_do(data); | |
262 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 LT |
263 | } |
264 | } | |
265 | ||
266 | /* Check for outstanding MCA/INIT records every minute (arbitrary) */ | |
267 | #define SALINFO_TIMER_DELAY (60*HZ) | |
268 | static struct timer_list salinfo_timer; | |
43ed3baf | 269 | extern void ia64_mlogbuf_dump(void); |
1da177e4 LT |
270 | |
271 | static void | |
272 | salinfo_timeout_check(struct salinfo_data *data) | |
273 | { | |
e026cca0 | 274 | unsigned long flags; |
1da177e4 LT |
275 | if (!data->open) |
276 | return; | |
e026cca0 KO |
277 | if (!cpus_empty(data->cpu_event)) { |
278 | spin_lock_irqsave(&data_saved_lock, flags); | |
279 | salinfo_work_to_do(data); | |
280 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 LT |
281 | } |
282 | } | |
283 | ||
e026cca0 | 284 | static void |
1da177e4 LT |
285 | salinfo_timeout (unsigned long arg) |
286 | { | |
43ed3baf | 287 | ia64_mlogbuf_dump(); |
1da177e4 LT |
288 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA); |
289 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT); | |
290 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
291 | add_timer(&salinfo_timer); | |
292 | } | |
293 | ||
294 | static int | |
295 | salinfo_event_open(struct inode *inode, struct file *file) | |
296 | { | |
297 | if (!capable(CAP_SYS_ADMIN)) | |
298 | return -EPERM; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static ssize_t | |
303 | salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
304 | { | |
305 | struct inode *inode = file->f_dentry->d_inode; | |
306 | struct proc_dir_entry *entry = PDE(inode); | |
307 | struct salinfo_data *data = entry->data; | |
308 | char cmd[32]; | |
309 | size_t size; | |
310 | int i, n, cpu = -1; | |
311 | ||
312 | retry: | |
e026cca0 | 313 | if (cpus_empty(data->cpu_event) && down_trylock(&data->mutex)) { |
1da177e4 LT |
314 | if (file->f_flags & O_NONBLOCK) |
315 | return -EAGAIN; | |
e026cca0 | 316 | if (down_interruptible(&data->mutex)) |
05f70395 | 317 | return -EINTR; |
1da177e4 LT |
318 | } |
319 | ||
320 | n = data->cpu_check; | |
321 | for (i = 0; i < NR_CPUS; i++) { | |
e026cca0 KO |
322 | if (cpu_isset(n, data->cpu_event)) { |
323 | if (!cpu_online(n)) { | |
324 | cpu_clear(n, data->cpu_event); | |
325 | continue; | |
326 | } | |
1da177e4 LT |
327 | cpu = n; |
328 | break; | |
329 | } | |
330 | if (++n == NR_CPUS) | |
331 | n = 0; | |
332 | } | |
333 | ||
334 | if (cpu == -1) | |
335 | goto retry; | |
336 | ||
43ed3baf HS |
337 | ia64_mlogbuf_dump(); |
338 | ||
1da177e4 LT |
339 | /* for next read, start checking at next CPU */ |
340 | data->cpu_check = cpu; | |
341 | if (++data->cpu_check == NR_CPUS) | |
342 | data->cpu_check = 0; | |
343 | ||
344 | snprintf(cmd, sizeof(cmd), "read %d\n", cpu); | |
345 | ||
346 | size = strlen(cmd); | |
347 | if (size > count) | |
348 | size = count; | |
349 | if (copy_to_user(buffer, cmd, size)) | |
350 | return -EFAULT; | |
351 | ||
352 | return size; | |
353 | } | |
354 | ||
355 | static struct file_operations salinfo_event_fops = { | |
356 | .open = salinfo_event_open, | |
357 | .read = salinfo_event_read, | |
358 | }; | |
359 | ||
360 | static int | |
361 | salinfo_log_open(struct inode *inode, struct file *file) | |
362 | { | |
363 | struct proc_dir_entry *entry = PDE(inode); | |
364 | struct salinfo_data *data = entry->data; | |
365 | ||
366 | if (!capable(CAP_SYS_ADMIN)) | |
367 | return -EPERM; | |
368 | ||
369 | spin_lock(&data_lock); | |
370 | if (data->open) { | |
371 | spin_unlock(&data_lock); | |
372 | return -EBUSY; | |
373 | } | |
374 | data->open = 1; | |
375 | spin_unlock(&data_lock); | |
376 | ||
377 | if (data->state == STATE_NO_DATA && | |
378 | !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) { | |
379 | data->open = 0; | |
380 | return -ENOMEM; | |
381 | } | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static int | |
387 | salinfo_log_release(struct inode *inode, struct file *file) | |
388 | { | |
389 | struct proc_dir_entry *entry = PDE(inode); | |
390 | struct salinfo_data *data = entry->data; | |
391 | ||
392 | if (data->state == STATE_NO_DATA) { | |
393 | vfree(data->log_buffer); | |
394 | vfree(data->oemdata); | |
395 | data->log_buffer = NULL; | |
396 | data->oemdata = NULL; | |
397 | } | |
398 | spin_lock(&data_lock); | |
399 | data->open = 0; | |
400 | spin_unlock(&data_lock); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void | |
405 | call_on_cpu(int cpu, void (*fn)(void *), void *arg) | |
406 | { | |
e026cca0 KO |
407 | cpumask_t save_cpus_allowed = current->cpus_allowed; |
408 | cpumask_t new_cpus_allowed = cpumask_of_cpu(cpu); | |
1da177e4 LT |
409 | set_cpus_allowed(current, new_cpus_allowed); |
410 | (*fn)(arg); | |
411 | set_cpus_allowed(current, save_cpus_allowed); | |
412 | } | |
413 | ||
414 | static void | |
415 | salinfo_log_read_cpu(void *context) | |
416 | { | |
417 | struct salinfo_data *data = context; | |
418 | sal_log_record_header_t *rh; | |
419 | data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer); | |
420 | rh = (sal_log_record_header_t *)(data->log_buffer); | |
421 | /* Clear corrected errors as they are read from SAL */ | |
422 | if (rh->severity == sal_log_severity_corrected) | |
423 | ia64_sal_clear_state_info(data->type); | |
424 | } | |
425 | ||
426 | static void | |
427 | salinfo_log_new_read(int cpu, struct salinfo_data *data) | |
428 | { | |
429 | struct salinfo_data_saved *data_saved; | |
430 | unsigned long flags; | |
431 | int i; | |
432 | int saved_size = ARRAY_SIZE(data->data_saved); | |
433 | ||
434 | data->saved_num = 0; | |
435 | spin_lock_irqsave(&data_saved_lock, flags); | |
436 | retry: | |
437 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { | |
438 | if (data_saved->buffer && data_saved->cpu == cpu) { | |
439 | sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer); | |
440 | data->log_size = data_saved->size; | |
441 | memcpy(data->log_buffer, rh, data->log_size); | |
442 | barrier(); /* id check must not be moved */ | |
443 | if (rh->id == data_saved->id) { | |
444 | data->saved_num = i+1; | |
445 | break; | |
446 | } | |
447 | /* saved record changed by mca.c since interrupt, discard it */ | |
448 | shift1_data_saved(data, i); | |
449 | goto retry; | |
450 | } | |
451 | } | |
452 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
453 | ||
454 | if (!data->saved_num) | |
455 | call_on_cpu(cpu, salinfo_log_read_cpu, data); | |
456 | if (!data->log_size) { | |
e026cca0 KO |
457 | data->state = STATE_NO_DATA; |
458 | cpu_clear(cpu, data->cpu_event); | |
1da177e4 | 459 | } else { |
e026cca0 | 460 | data->state = STATE_LOG_RECORD; |
1da177e4 LT |
461 | } |
462 | } | |
463 | ||
464 | static ssize_t | |
465 | salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
466 | { | |
467 | struct inode *inode = file->f_dentry->d_inode; | |
468 | struct proc_dir_entry *entry = PDE(inode); | |
469 | struct salinfo_data *data = entry->data; | |
470 | u8 *buf; | |
471 | u64 bufsize; | |
472 | ||
473 | if (data->state == STATE_LOG_RECORD) { | |
474 | buf = data->log_buffer; | |
475 | bufsize = data->log_size; | |
476 | } else if (data->state == STATE_OEMDATA) { | |
477 | buf = data->oemdata; | |
478 | bufsize = data->oemdata_size; | |
479 | } else { | |
480 | buf = NULL; | |
481 | bufsize = 0; | |
482 | } | |
483 | return simple_read_from_buffer(buffer, count, ppos, buf, bufsize); | |
484 | } | |
485 | ||
486 | static void | |
487 | salinfo_log_clear_cpu(void *context) | |
488 | { | |
489 | struct salinfo_data *data = context; | |
490 | ia64_sal_clear_state_info(data->type); | |
491 | } | |
492 | ||
493 | static int | |
494 | salinfo_log_clear(struct salinfo_data *data, int cpu) | |
495 | { | |
496 | sal_log_record_header_t *rh; | |
e026cca0 KO |
497 | unsigned long flags; |
498 | spin_lock_irqsave(&data_saved_lock, flags); | |
1da177e4 | 499 | data->state = STATE_NO_DATA; |
e026cca0 KO |
500 | if (!cpu_isset(cpu, data->cpu_event)) { |
501 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
1da177e4 | 502 | return 0; |
e026cca0 KO |
503 | } |
504 | cpu_clear(cpu, data->cpu_event); | |
1da177e4 | 505 | if (data->saved_num) { |
e026cca0 | 506 | shift1_data_saved(data, data->saved_num - 1); |
1da177e4 | 507 | data->saved_num = 0; |
1da177e4 | 508 | } |
e026cca0 | 509 | spin_unlock_irqrestore(&data_saved_lock, flags); |
1da177e4 LT |
510 | rh = (sal_log_record_header_t *)(data->log_buffer); |
511 | /* Corrected errors have already been cleared from SAL */ | |
512 | if (rh->severity != sal_log_severity_corrected) | |
513 | call_on_cpu(cpu, salinfo_log_clear_cpu, data); | |
514 | /* clearing a record may make a new record visible */ | |
515 | salinfo_log_new_read(cpu, data); | |
e026cca0 KO |
516 | if (data->state == STATE_LOG_RECORD) { |
517 | spin_lock_irqsave(&data_saved_lock, flags); | |
518 | cpu_set(cpu, data->cpu_event); | |
519 | salinfo_work_to_do(data); | |
520 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
521 | } | |
1da177e4 LT |
522 | return 0; |
523 | } | |
524 | ||
525 | static ssize_t | |
526 | salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
527 | { | |
528 | struct inode *inode = file->f_dentry->d_inode; | |
529 | struct proc_dir_entry *entry = PDE(inode); | |
530 | struct salinfo_data *data = entry->data; | |
531 | char cmd[32]; | |
532 | size_t size; | |
533 | u32 offset; | |
534 | int cpu; | |
535 | ||
536 | size = sizeof(cmd); | |
537 | if (count < size) | |
538 | size = count; | |
539 | if (copy_from_user(cmd, buffer, size)) | |
540 | return -EFAULT; | |
541 | ||
542 | if (sscanf(cmd, "read %d", &cpu) == 1) { | |
543 | salinfo_log_new_read(cpu, data); | |
544 | } else if (sscanf(cmd, "clear %d", &cpu) == 1) { | |
545 | int ret; | |
546 | if ((ret = salinfo_log_clear(data, cpu))) | |
547 | count = ret; | |
548 | } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) { | |
549 | if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA) | |
550 | return -EINVAL; | |
551 | if (offset > data->log_size - sizeof(efi_guid_t)) | |
552 | return -EINVAL; | |
553 | data->state = STATE_OEMDATA; | |
554 | if (salinfo_platform_oemdata) { | |
555 | struct salinfo_platform_oemdata_parms parms = { | |
556 | .efi_guid = data->log_buffer + offset, | |
557 | .oemdata = &data->oemdata, | |
558 | .oemdata_size = &data->oemdata_size | |
559 | }; | |
560 | call_on_cpu(cpu, salinfo_platform_oemdata_cpu, &parms); | |
561 | if (parms.ret) | |
562 | count = parms.ret; | |
563 | } else | |
564 | data->oemdata_size = 0; | |
565 | } else | |
566 | return -EINVAL; | |
567 | ||
568 | return count; | |
569 | } | |
570 | ||
571 | static struct file_operations salinfo_data_fops = { | |
572 | .open = salinfo_log_open, | |
573 | .release = salinfo_log_release, | |
574 | .read = salinfo_log_read, | |
575 | .write = salinfo_log_write, | |
576 | }; | |
577 | ||
9c7b216d | 578 | static int __devinit |
e026cca0 KO |
579 | salinfo_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) |
580 | { | |
581 | unsigned int i, cpu = (unsigned long)hcpu; | |
582 | unsigned long flags; | |
583 | struct salinfo_data *data; | |
584 | switch (action) { | |
585 | case CPU_ONLINE: | |
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: | |
596 | spin_lock_irqsave(&data_saved_lock, flags); | |
597 | for (i = 0, data = salinfo_data; | |
598 | i < ARRAY_SIZE(salinfo_data); | |
599 | ++i, ++data) { | |
600 | struct salinfo_data_saved *data_saved; | |
601 | int j; | |
602 | for (j = ARRAY_SIZE(data->data_saved) - 1, data_saved = data->data_saved + j; | |
603 | j >= 0; | |
604 | --j, --data_saved) { | |
605 | if (data_saved->buffer && data_saved->cpu == cpu) { | |
606 | shift1_data_saved(data, j); | |
607 | } | |
608 | } | |
609 | cpu_clear(cpu, data->cpu_event); | |
610 | } | |
611 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
612 | break; | |
613 | } | |
614 | return NOTIFY_OK; | |
615 | } | |
616 | ||
617 | static struct notifier_block salinfo_cpu_notifier = | |
618 | { | |
619 | .notifier_call = salinfo_cpu_callback, | |
620 | .priority = 0, | |
621 | }; | |
e026cca0 | 622 | |
1da177e4 LT |
623 | static int __init |
624 | salinfo_init(void) | |
625 | { | |
626 | struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */ | |
627 | struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */ | |
628 | struct proc_dir_entry *dir, *entry; | |
629 | struct salinfo_data *data; | |
e026cca0 | 630 | int i, j; |
1da177e4 LT |
631 | |
632 | salinfo_dir = proc_mkdir("sal", NULL); | |
633 | if (!salinfo_dir) | |
634 | return 0; | |
635 | ||
636 | for (i=0; i < NR_SALINFO_ENTRIES; i++) { | |
637 | /* pass the feature bit in question as misc data */ | |
638 | *sdir++ = create_proc_read_entry (salinfo_entries[i].name, 0, salinfo_dir, | |
639 | salinfo_read, (void *)salinfo_entries[i].feature); | |
640 | } | |
641 | ||
642 | for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) { | |
643 | data = salinfo_data + i; | |
644 | data->type = i; | |
e026cca0 | 645 | init_MUTEX(&data->mutex); |
1da177e4 LT |
646 | dir = proc_mkdir(salinfo_log_name[i], salinfo_dir); |
647 | if (!dir) | |
648 | continue; | |
649 | ||
650 | entry = create_proc_entry("event", S_IRUSR, dir); | |
651 | if (!entry) | |
652 | continue; | |
653 | entry->data = data; | |
654 | entry->proc_fops = &salinfo_event_fops; | |
655 | *sdir++ = entry; | |
656 | ||
657 | entry = create_proc_entry("data", S_IRUSR | S_IWUSR, dir); | |
658 | if (!entry) | |
659 | continue; | |
660 | entry->data = data; | |
661 | entry->proc_fops = &salinfo_data_fops; | |
662 | *sdir++ = entry; | |
663 | ||
664 | /* we missed any events before now */ | |
e026cca0 KO |
665 | for_each_online_cpu(j) |
666 | cpu_set(j, data->cpu_event); | |
1da177e4 LT |
667 | |
668 | *sdir++ = dir; | |
669 | } | |
670 | ||
671 | *sdir++ = salinfo_dir; | |
672 | ||
673 | init_timer(&salinfo_timer); | |
674 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
675 | salinfo_timer.function = &salinfo_timeout; | |
676 | add_timer(&salinfo_timer); | |
677 | ||
5a67e4c5 | 678 | register_hotcpu_notifier(&salinfo_cpu_notifier); |
e026cca0 | 679 | |
1da177e4 LT |
680 | return 0; |
681 | } | |
682 | ||
683 | /* | |
684 | * 'data' contains an integer that corresponds to the feature we're | |
685 | * testing | |
686 | */ | |
687 | static int | |
688 | salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data) | |
689 | { | |
690 | int len = 0; | |
691 | ||
692 | len = sprintf(page, (sal_platform_features & (unsigned long)data) ? "1\n" : "0\n"); | |
693 | ||
694 | if (len <= off+count) *eof = 1; | |
695 | ||
696 | *start = page + off; | |
697 | len -= off; | |
698 | ||
699 | if (len>count) len = count; | |
700 | if (len<0) len = 0; | |
701 | ||
702 | return len; | |
703 | } | |
704 | ||
705 | module_init(salinfo_init); |