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> | |
e781c3d7 | 43 | #include <linux/seq_file.h> |
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/smp.h> | |
1da177e4 LT |
46 | #include <linux/timer.h> |
47 | #include <linux/vmalloc.h> | |
6188e10d | 48 | #include <linux/semaphore.h> |
1da177e4 | 49 | |
1da177e4 | 50 | #include <asm/sal.h> |
7c0f6ba6 | 51 | #include <linux/uaccess.h> |
1da177e4 LT |
52 | |
53 | MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); | |
54 | MODULE_DESCRIPTION("/proc interface to IA-64 SAL features"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
e781c3d7 | 57 | static const struct file_operations proc_salinfo_fops; |
1da177e4 LT |
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 | */ | |
e781c3d7 | 69 | static const salinfo_entry_t salinfo_entries[]={ |
1da177e4 LT |
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 | 143 | cpumask_t cpu_event; /* which cpus have outstanding events */ |
fbb0e4da | 144 | wait_queue_head_t read_wait; |
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. | |
72fdbdce | 166 | * @oemdata: returns vmalloc area containing the decoded output. |
1da177e4 LT |
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 | ||
185 | static void | |
186 | salinfo_platform_oemdata_cpu(void *context) | |
187 | { | |
188 | struct salinfo_platform_oemdata_parms *parms = context; | |
189 | parms->ret = salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size); | |
190 | } | |
191 | ||
192 | static void | |
193 | shift1_data_saved (struct salinfo_data *data, int shift) | |
194 | { | |
195 | memcpy(data->data_saved+shift, data->data_saved+shift+1, | |
196 | (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0])); | |
197 | memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0, | |
198 | sizeof(data->data_saved[0])); | |
199 | } | |
200 | ||
201 | /* This routine is invoked in interrupt context. Note: mca.c enables | |
202 | * interrupts before calling this code for CMC/CPE. MCA and INIT events are | |
203 | * not irq safe, do not call any routines that use spinlocks, they may deadlock. | |
204 | * MCA and INIT records are recorded, a timer event will look for any | |
205 | * outstanding events and wake up the user space code. | |
206 | * | |
207 | * The buffer passed from mca.c points to the output from ia64_log_get. This is | |
208 | * a persistent buffer but its contents can change between the interrupt and | |
209 | * when user space processes the record. Save the record id to identify | |
289d773e | 210 | * changes. If the buffer is NULL then just update the bitmap. |
1da177e4 LT |
211 | */ |
212 | void | |
213 | salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe) | |
214 | { | |
215 | struct salinfo_data *data = salinfo_data + type; | |
216 | struct salinfo_data_saved *data_saved; | |
217 | unsigned long flags = 0; | |
218 | int i; | |
219 | int saved_size = ARRAY_SIZE(data->data_saved); | |
220 | ||
221 | BUG_ON(type >= ARRAY_SIZE(salinfo_log_name)); | |
222 | ||
e026cca0 KO |
223 | if (irqsafe) |
224 | spin_lock_irqsave(&data_saved_lock, flags); | |
289d773e | 225 | if (buffer) { |
289d773e KO |
226 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { |
227 | if (!data_saved->buffer) | |
228 | break; | |
229 | } | |
230 | if (i == saved_size) { | |
231 | if (!data->saved_num) { | |
232 | shift1_data_saved(data, 0); | |
233 | data_saved = data->data_saved + saved_size - 1; | |
234 | } else | |
235 | data_saved = NULL; | |
236 | } | |
237 | if (data_saved) { | |
238 | data_saved->cpu = smp_processor_id(); | |
239 | data_saved->id = ((sal_log_record_header_t *)buffer)->id; | |
240 | data_saved->size = size; | |
241 | data_saved->buffer = buffer; | |
242 | } | |
1da177e4 | 243 | } |
5d2068da | 244 | cpumask_set_cpu(smp_processor_id(), &data->cpu_event); |
e026cca0 | 245 | if (irqsafe) { |
fbb0e4da | 246 | wake_up_interruptible(&data->read_wait); |
e026cca0 | 247 | spin_unlock_irqrestore(&data_saved_lock, flags); |
1da177e4 LT |
248 | } |
249 | } | |
250 | ||
251 | /* Check for outstanding MCA/INIT records every minute (arbitrary) */ | |
252 | #define SALINFO_TIMER_DELAY (60*HZ) | |
253 | static struct timer_list salinfo_timer; | |
43ed3baf | 254 | extern void ia64_mlogbuf_dump(void); |
1da177e4 LT |
255 | |
256 | static void | |
257 | salinfo_timeout_check(struct salinfo_data *data) | |
258 | { | |
1da177e4 LT |
259 | if (!data->open) |
260 | return; | |
fbb0e4da SAS |
261 | if (!cpumask_empty(&data->cpu_event)) |
262 | wake_up_interruptible(&data->read_wait); | |
1da177e4 LT |
263 | } |
264 | ||
e026cca0 | 265 | static void |
1da177e4 LT |
266 | salinfo_timeout (unsigned long arg) |
267 | { | |
43ed3baf | 268 | ia64_mlogbuf_dump(); |
1da177e4 LT |
269 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA); |
270 | salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT); | |
271 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
272 | add_timer(&salinfo_timer); | |
273 | } | |
274 | ||
275 | static int | |
276 | salinfo_event_open(struct inode *inode, struct file *file) | |
277 | { | |
278 | if (!capable(CAP_SYS_ADMIN)) | |
279 | return -EPERM; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static ssize_t | |
284 | salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
285 | { | |
d9dda78b | 286 | struct salinfo_data *data = PDE_DATA(file_inode(file)); |
1da177e4 LT |
287 | char cmd[32]; |
288 | size_t size; | |
289 | int i, n, cpu = -1; | |
290 | ||
291 | retry: | |
fbb0e4da | 292 | if (cpumask_empty(&data->cpu_event)) { |
1da177e4 LT |
293 | if (file->f_flags & O_NONBLOCK) |
294 | return -EAGAIN; | |
fbb0e4da SAS |
295 | if (wait_event_interruptible(data->read_wait, |
296 | !cpumask_empty(&data->cpu_event))) | |
05f70395 | 297 | return -EINTR; |
1da177e4 LT |
298 | } |
299 | ||
300 | n = data->cpu_check; | |
5dd3c994 | 301 | for (i = 0; i < nr_cpu_ids; i++) { |
5d2068da | 302 | if (cpumask_test_cpu(n, &data->cpu_event)) { |
e026cca0 | 303 | if (!cpu_online(n)) { |
5d2068da | 304 | cpumask_clear_cpu(n, &data->cpu_event); |
e026cca0 KO |
305 | continue; |
306 | } | |
1da177e4 LT |
307 | cpu = n; |
308 | break; | |
309 | } | |
5dd3c994 | 310 | if (++n == nr_cpu_ids) |
1da177e4 LT |
311 | n = 0; |
312 | } | |
313 | ||
314 | if (cpu == -1) | |
315 | goto retry; | |
316 | ||
43ed3baf HS |
317 | ia64_mlogbuf_dump(); |
318 | ||
1da177e4 LT |
319 | /* for next read, start checking at next CPU */ |
320 | data->cpu_check = cpu; | |
5dd3c994 | 321 | if (++data->cpu_check == nr_cpu_ids) |
1da177e4 LT |
322 | data->cpu_check = 0; |
323 | ||
324 | snprintf(cmd, sizeof(cmd), "read %d\n", cpu); | |
325 | ||
326 | size = strlen(cmd); | |
327 | if (size > count) | |
328 | size = count; | |
329 | if (copy_to_user(buffer, cmd, size)) | |
330 | return -EFAULT; | |
331 | ||
332 | return size; | |
333 | } | |
334 | ||
5dfe4c96 | 335 | static const struct file_operations salinfo_event_fops = { |
1da177e4 LT |
336 | .open = salinfo_event_open, |
337 | .read = salinfo_event_read, | |
6038f373 | 338 | .llseek = noop_llseek, |
1da177e4 LT |
339 | }; |
340 | ||
341 | static int | |
342 | salinfo_log_open(struct inode *inode, struct file *file) | |
343 | { | |
d9dda78b | 344 | struct salinfo_data *data = PDE_DATA(inode); |
1da177e4 LT |
345 | |
346 | if (!capable(CAP_SYS_ADMIN)) | |
347 | return -EPERM; | |
348 | ||
349 | spin_lock(&data_lock); | |
350 | if (data->open) { | |
351 | spin_unlock(&data_lock); | |
352 | return -EBUSY; | |
353 | } | |
354 | data->open = 1; | |
355 | spin_unlock(&data_lock); | |
356 | ||
357 | if (data->state == STATE_NO_DATA && | |
358 | !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) { | |
359 | data->open = 0; | |
360 | return -ENOMEM; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static int | |
367 | salinfo_log_release(struct inode *inode, struct file *file) | |
368 | { | |
d9dda78b | 369 | struct salinfo_data *data = PDE_DATA(inode); |
1da177e4 LT |
370 | |
371 | if (data->state == STATE_NO_DATA) { | |
372 | vfree(data->log_buffer); | |
373 | vfree(data->oemdata); | |
374 | data->log_buffer = NULL; | |
375 | data->oemdata = NULL; | |
376 | } | |
377 | spin_lock(&data_lock); | |
378 | data->open = 0; | |
379 | spin_unlock(&data_lock); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static void | |
384 | call_on_cpu(int cpu, void (*fn)(void *), void *arg) | |
385 | { | |
e026cca0 | 386 | cpumask_t save_cpus_allowed = current->cpus_allowed; |
552dce3a | 387 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); |
1da177e4 | 388 | (*fn)(arg); |
552dce3a | 389 | set_cpus_allowed_ptr(current, &save_cpus_allowed); |
1da177e4 LT |
390 | } |
391 | ||
392 | static void | |
393 | salinfo_log_read_cpu(void *context) | |
394 | { | |
395 | struct salinfo_data *data = context; | |
396 | sal_log_record_header_t *rh; | |
397 | data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer); | |
398 | rh = (sal_log_record_header_t *)(data->log_buffer); | |
399 | /* Clear corrected errors as they are read from SAL */ | |
400 | if (rh->severity == sal_log_severity_corrected) | |
401 | ia64_sal_clear_state_info(data->type); | |
402 | } | |
403 | ||
404 | static void | |
405 | salinfo_log_new_read(int cpu, struct salinfo_data *data) | |
406 | { | |
407 | struct salinfo_data_saved *data_saved; | |
408 | unsigned long flags; | |
409 | int i; | |
410 | int saved_size = ARRAY_SIZE(data->data_saved); | |
411 | ||
412 | data->saved_num = 0; | |
413 | spin_lock_irqsave(&data_saved_lock, flags); | |
414 | retry: | |
415 | for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) { | |
416 | if (data_saved->buffer && data_saved->cpu == cpu) { | |
417 | sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer); | |
418 | data->log_size = data_saved->size; | |
419 | memcpy(data->log_buffer, rh, data->log_size); | |
420 | barrier(); /* id check must not be moved */ | |
421 | if (rh->id == data_saved->id) { | |
422 | data->saved_num = i+1; | |
423 | break; | |
424 | } | |
425 | /* saved record changed by mca.c since interrupt, discard it */ | |
426 | shift1_data_saved(data, i); | |
427 | goto retry; | |
428 | } | |
429 | } | |
430 | spin_unlock_irqrestore(&data_saved_lock, flags); | |
431 | ||
432 | if (!data->saved_num) | |
433 | call_on_cpu(cpu, salinfo_log_read_cpu, data); | |
434 | if (!data->log_size) { | |
e026cca0 | 435 | data->state = STATE_NO_DATA; |
5d2068da | 436 | cpumask_clear_cpu(cpu, &data->cpu_event); |
1da177e4 | 437 | } else { |
e026cca0 | 438 | data->state = STATE_LOG_RECORD; |
1da177e4 LT |
439 | } |
440 | } | |
441 | ||
442 | static ssize_t | |
443 | salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
444 | { | |
d9dda78b | 445 | struct salinfo_data *data = PDE_DATA(file_inode(file)); |
1da177e4 LT |
446 | u8 *buf; |
447 | u64 bufsize; | |
448 | ||
449 | if (data->state == STATE_LOG_RECORD) { | |
450 | buf = data->log_buffer; | |
451 | bufsize = data->log_size; | |
452 | } else if (data->state == STATE_OEMDATA) { | |
453 | buf = data->oemdata; | |
454 | bufsize = data->oemdata_size; | |
455 | } else { | |
456 | buf = NULL; | |
457 | bufsize = 0; | |
458 | } | |
459 | return simple_read_from_buffer(buffer, count, ppos, buf, bufsize); | |
460 | } | |
461 | ||
462 | static void | |
463 | salinfo_log_clear_cpu(void *context) | |
464 | { | |
465 | struct salinfo_data *data = context; | |
466 | ia64_sal_clear_state_info(data->type); | |
467 | } | |
468 | ||
469 | static int | |
470 | salinfo_log_clear(struct salinfo_data *data, int cpu) | |
471 | { | |
472 | sal_log_record_header_t *rh; | |
e026cca0 KO |
473 | unsigned long flags; |
474 | spin_lock_irqsave(&data_saved_lock, flags); | |
1da177e4 | 475 | data->state = STATE_NO_DATA; |
5d2068da | 476 | if (!cpumask_test_cpu(cpu, &data->cpu_event)) { |
e026cca0 | 477 | spin_unlock_irqrestore(&data_saved_lock, flags); |
1da177e4 | 478 | return 0; |
e026cca0 | 479 | } |
5d2068da | 480 | cpumask_clear_cpu(cpu, &data->cpu_event); |
1da177e4 | 481 | if (data->saved_num) { |
e026cca0 | 482 | shift1_data_saved(data, data->saved_num - 1); |
1da177e4 | 483 | data->saved_num = 0; |
1da177e4 | 484 | } |
e026cca0 | 485 | spin_unlock_irqrestore(&data_saved_lock, flags); |
1da177e4 LT |
486 | rh = (sal_log_record_header_t *)(data->log_buffer); |
487 | /* Corrected errors have already been cleared from SAL */ | |
488 | if (rh->severity != sal_log_severity_corrected) | |
489 | call_on_cpu(cpu, salinfo_log_clear_cpu, data); | |
490 | /* clearing a record may make a new record visible */ | |
491 | salinfo_log_new_read(cpu, data); | |
e026cca0 KO |
492 | if (data->state == STATE_LOG_RECORD) { |
493 | spin_lock_irqsave(&data_saved_lock, flags); | |
5d2068da | 494 | cpumask_set_cpu(cpu, &data->cpu_event); |
fbb0e4da | 495 | wake_up_interruptible(&data->read_wait); |
e026cca0 KO |
496 | spin_unlock_irqrestore(&data_saved_lock, flags); |
497 | } | |
1da177e4 LT |
498 | return 0; |
499 | } | |
500 | ||
501 | static ssize_t | |
502 | salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
503 | { | |
d9dda78b | 504 | struct salinfo_data *data = PDE_DATA(file_inode(file)); |
1da177e4 LT |
505 | char cmd[32]; |
506 | size_t size; | |
507 | u32 offset; | |
508 | int cpu; | |
509 | ||
510 | size = sizeof(cmd); | |
511 | if (count < size) | |
512 | size = count; | |
513 | if (copy_from_user(cmd, buffer, size)) | |
514 | return -EFAULT; | |
515 | ||
516 | if (sscanf(cmd, "read %d", &cpu) == 1) { | |
517 | salinfo_log_new_read(cpu, data); | |
518 | } else if (sscanf(cmd, "clear %d", &cpu) == 1) { | |
519 | int ret; | |
520 | if ((ret = salinfo_log_clear(data, cpu))) | |
521 | count = ret; | |
522 | } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) { | |
523 | if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA) | |
524 | return -EINVAL; | |
525 | if (offset > data->log_size - sizeof(efi_guid_t)) | |
526 | return -EINVAL; | |
527 | data->state = STATE_OEMDATA; | |
528 | if (salinfo_platform_oemdata) { | |
529 | struct salinfo_platform_oemdata_parms parms = { | |
530 | .efi_guid = data->log_buffer + offset, | |
531 | .oemdata = &data->oemdata, | |
532 | .oemdata_size = &data->oemdata_size | |
533 | }; | |
534 | call_on_cpu(cpu, salinfo_platform_oemdata_cpu, &parms); | |
535 | if (parms.ret) | |
536 | count = parms.ret; | |
537 | } else | |
538 | data->oemdata_size = 0; | |
539 | } else | |
540 | return -EINVAL; | |
541 | ||
542 | return count; | |
543 | } | |
544 | ||
5dfe4c96 | 545 | static const struct file_operations salinfo_data_fops = { |
1da177e4 LT |
546 | .open = salinfo_log_open, |
547 | .release = salinfo_log_release, | |
548 | .read = salinfo_log_read, | |
549 | .write = salinfo_log_write, | |
6038f373 | 550 | .llseek = default_llseek, |
1da177e4 LT |
551 | }; |
552 | ||
aa17662b | 553 | static int salinfo_cpu_online(unsigned int cpu) |
e026cca0 | 554 | { |
aa17662b | 555 | unsigned int i, end = ARRAY_SIZE(salinfo_data); |
e026cca0 | 556 | struct salinfo_data *data; |
aa17662b SAS |
557 | |
558 | spin_lock_irq(&data_saved_lock); | |
559 | for (i = 0, data = salinfo_data; i < end; ++i, ++data) { | |
560 | cpumask_set_cpu(cpu, &data->cpu_event); | |
561 | wake_up_interruptible(&data->read_wait); | |
e026cca0 | 562 | } |
aa17662b SAS |
563 | spin_unlock_irq(&data_saved_lock); |
564 | return 0; | |
e026cca0 KO |
565 | } |
566 | ||
aa17662b | 567 | static int salinfo_cpu_pre_down(unsigned int cpu) |
e026cca0 | 568 | { |
aa17662b SAS |
569 | unsigned int i, end = ARRAY_SIZE(salinfo_data); |
570 | struct salinfo_data *data; | |
571 | ||
572 | spin_lock_irq(&data_saved_lock); | |
573 | for (i = 0, data = salinfo_data; i < end; ++i, ++data) { | |
574 | struct salinfo_data_saved *data_saved; | |
575 | int j = ARRAY_SIZE(data->data_saved) - 1; | |
576 | ||
577 | for (data_saved = data->data_saved + j; j >= 0; | |
578 | --j, --data_saved) { | |
579 | if (data_saved->buffer && data_saved->cpu == cpu) | |
580 | shift1_data_saved(data, j); | |
581 | } | |
582 | cpumask_clear_cpu(cpu, &data->cpu_event); | |
583 | } | |
584 | spin_unlock_irq(&data_saved_lock); | |
585 | return 0; | |
586 | } | |
e026cca0 | 587 | |
1da177e4 LT |
588 | static int __init |
589 | salinfo_init(void) | |
590 | { | |
591 | struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */ | |
592 | struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */ | |
593 | struct proc_dir_entry *dir, *entry; | |
594 | struct salinfo_data *data; | |
aa17662b | 595 | int i; |
1da177e4 LT |
596 | |
597 | salinfo_dir = proc_mkdir("sal", NULL); | |
598 | if (!salinfo_dir) | |
599 | return 0; | |
600 | ||
601 | for (i=0; i < NR_SALINFO_ENTRIES; i++) { | |
602 | /* pass the feature bit in question as misc data */ | |
e781c3d7 DH |
603 | *sdir++ = proc_create_data(salinfo_entries[i].name, 0, salinfo_dir, |
604 | &proc_salinfo_fops, | |
605 | (void *)salinfo_entries[i].feature); | |
1da177e4 LT |
606 | } |
607 | ||
608 | for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) { | |
609 | data = salinfo_data + i; | |
610 | data->type = i; | |
fbb0e4da | 611 | init_waitqueue_head(&data->read_wait); |
1da177e4 LT |
612 | dir = proc_mkdir(salinfo_log_name[i], salinfo_dir); |
613 | if (!dir) | |
614 | continue; | |
615 | ||
e2363768 DL |
616 | entry = proc_create_data("event", S_IRUSR, dir, |
617 | &salinfo_event_fops, data); | |
1da177e4 LT |
618 | if (!entry) |
619 | continue; | |
1da177e4 LT |
620 | *sdir++ = entry; |
621 | ||
e2363768 DL |
622 | entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir, |
623 | &salinfo_data_fops, data); | |
1da177e4 LT |
624 | if (!entry) |
625 | continue; | |
1da177e4 LT |
626 | *sdir++ = entry; |
627 | ||
1da177e4 LT |
628 | *sdir++ = dir; |
629 | } | |
630 | ||
631 | *sdir++ = salinfo_dir; | |
632 | ||
633 | init_timer(&salinfo_timer); | |
634 | salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; | |
635 | salinfo_timer.function = &salinfo_timeout; | |
636 | add_timer(&salinfo_timer); | |
637 | ||
aa17662b SAS |
638 | i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online", |
639 | salinfo_cpu_online, salinfo_cpu_pre_down); | |
640 | WARN_ON(i < 0); | |
1da177e4 LT |
641 | return 0; |
642 | } | |
643 | ||
644 | /* | |
645 | * 'data' contains an integer that corresponds to the feature we're | |
646 | * testing | |
647 | */ | |
e781c3d7 | 648 | static int proc_salinfo_show(struct seq_file *m, void *v) |
1da177e4 | 649 | { |
e781c3d7 DH |
650 | unsigned long data = (unsigned long)v; |
651 | seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n"); | |
652 | return 0; | |
653 | } | |
1da177e4 | 654 | |
e781c3d7 DH |
655 | static int proc_salinfo_open(struct inode *inode, struct file *file) |
656 | { | |
657 | return single_open(file, proc_salinfo_show, PDE_DATA(inode)); | |
1da177e4 LT |
658 | } |
659 | ||
e781c3d7 DH |
660 | static const struct file_operations proc_salinfo_fops = { |
661 | .open = proc_salinfo_open, | |
662 | .read = seq_read, | |
663 | .llseek = seq_lseek, | |
75401461 | 664 | .release = single_release, |
e781c3d7 DH |
665 | }; |
666 | ||
1da177e4 | 667 | module_init(salinfo_init); |