tun: Limit amount of queued packets per device
[linux-2.6] / drivers / acpi / system.c
1 /*
2  *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <asm/uaccess.h>
31
32 #include <acpi/acpi_drivers.h>
33
34 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
35 ACPI_MODULE_NAME("system");
36 #ifdef MODULE_PARAM_PREFIX
37 #undef MODULE_PARAM_PREFIX
38 #endif
39 #define MODULE_PARAM_PREFIX "acpi."
40
41 #define ACPI_SYSTEM_CLASS               "system"
42 #define ACPI_SYSTEM_DEVICE_NAME         "System"
43
44 u32 acpi_irq_handled;
45
46 /*
47  * Make ACPICA version work as module param
48  */
49 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
50 {
51         int result;
52
53         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
54
55         return result;
56 }
57
58 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
59
60 /* --------------------------------------------------------------------------
61                               FS Interface (/sys)
62    -------------------------------------------------------------------------- */
63 static LIST_HEAD(acpi_table_attr_list);
64 static struct kobject *tables_kobj;
65
66 struct acpi_table_attr {
67         struct bin_attribute attr;
68         char name[8];
69         int instance;
70         struct list_head node;
71 };
72
73 static ssize_t acpi_table_show(struct kobject *kobj,
74                                struct bin_attribute *bin_attr, char *buf,
75                                loff_t offset, size_t count)
76 {
77         struct acpi_table_attr *table_attr =
78             container_of(bin_attr, struct acpi_table_attr, attr);
79         struct acpi_table_header *table_header = NULL;
80         acpi_status status;
81         char name[ACPI_NAME_SIZE];
82
83         if (strncmp(table_attr->name, "NULL", 4))
84                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
85         else
86                 memcpy(name, "\0\0\0\0", 4);
87
88         status =
89             acpi_get_table(name, table_attr->instance,
90                            &table_header);
91         if (ACPI_FAILURE(status))
92                 return -ENODEV;
93
94         return memory_read_from_buffer(buf, count, &offset,
95                                         table_header, table_header->length);
96 }
97
98 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
99                                  struct acpi_table_header *table_header)
100 {
101         struct acpi_table_header *header = NULL;
102         struct acpi_table_attr *attr = NULL;
103
104         if (table_header->signature[0] != '\0')
105                 memcpy(table_attr->name, table_header->signature,
106                         ACPI_NAME_SIZE);
107         else
108                 memcpy(table_attr->name, "NULL", 4);
109
110         list_for_each_entry(attr, &acpi_table_attr_list, node) {
111                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
112                         if (table_attr->instance < attr->instance)
113                                 table_attr->instance = attr->instance;
114         }
115         table_attr->instance++;
116
117         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
118                                         !acpi_get_table
119                                         (table_header->signature, 2, &header)))
120                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
121                         table_attr->instance);
122
123         table_attr->attr.size = 0;
124         table_attr->attr.read = acpi_table_show;
125         table_attr->attr.attr.name = table_attr->name;
126         table_attr->attr.attr.mode = 0444;
127
128         return;
129 }
130
131 static int acpi_system_sysfs_init(void)
132 {
133         struct acpi_table_attr *table_attr;
134         struct acpi_table_header *table_header = NULL;
135         int table_index = 0;
136         int result;
137
138         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
139         if (!tables_kobj)
140                 return -ENOMEM;
141
142         do {
143                 result = acpi_get_table_by_index(table_index, &table_header);
144                 if (!result) {
145                         table_index++;
146                         table_attr = NULL;
147                         table_attr =
148                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
149                         if (!table_attr)
150                                 return -ENOMEM;
151
152                         acpi_table_attr_init(table_attr, table_header);
153                         result =
154                             sysfs_create_bin_file(tables_kobj,
155                                                   &table_attr->attr);
156                         if (result) {
157                                 kfree(table_attr);
158                                 return result;
159                         } else
160                                 list_add_tail(&table_attr->node,
161                                               &acpi_table_attr_list);
162                 }
163         } while (!result);
164         kobject_uevent(tables_kobj, KOBJ_ADD);
165
166         return 0;
167 }
168
169 /*
170  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
171  * See Documentation/ABI/testing/sysfs-firmware-acpi
172  */
173
174 #define COUNT_GPE 0
175 #define COUNT_SCI 1     /* acpi_irq_handled */
176 #define COUNT_ERROR 2   /* other */
177 #define NUM_COUNTERS_EXTRA 3
178
179 struct event_counter {
180         u32 count;
181         u32 flags;
182 };
183
184 static struct event_counter *all_counters;
185 static u32 num_gpes;
186 static u32 num_counters;
187 static struct attribute **all_attrs;
188 static u32 acpi_gpe_count;
189
190 static struct attribute_group interrupt_stats_attr_group = {
191         .name = "interrupts",
192 };
193 static struct kobj_attribute *counter_attrs;
194
195 static void delete_gpe_attr_array(void)
196 {
197         struct event_counter *tmp = all_counters;
198
199         all_counters = NULL;
200         kfree(tmp);
201
202         if (counter_attrs) {
203                 int i;
204
205                 for (i = 0; i < num_gpes; i++)
206                         kfree(counter_attrs[i].attr.name);
207
208                 kfree(counter_attrs);
209         }
210         kfree(all_attrs);
211
212         return;
213 }
214
215 void acpi_os_gpe_count(u32 gpe_number)
216 {
217         acpi_gpe_count++;
218
219         if (!all_counters)
220                 return;
221
222         if (gpe_number < num_gpes)
223                 all_counters[gpe_number].count++;
224         else
225                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
226                                         count++;
227
228         return;
229 }
230
231 void acpi_os_fixed_event_count(u32 event_number)
232 {
233         if (!all_counters)
234                 return;
235
236         if (event_number < ACPI_NUM_FIXED_EVENTS)
237                 all_counters[num_gpes + event_number].count++;
238         else
239                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
240                                 count++;
241
242         return;
243 }
244
245 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
246 {
247         int result = 0;
248
249         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
250                 goto end;
251
252         if (index < num_gpes) {
253                 result = acpi_get_gpe_device(index, handle);
254                 if (result) {
255                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
256                                 "Invalid GPE 0x%x\n", index));
257                         goto end;
258                 }
259                 result = acpi_get_gpe_status(*handle, index,
260                                                 ACPI_NOT_ISR, status);
261         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
262                 result = acpi_get_event_status(index - num_gpes, status);
263
264 end:
265         return result;
266 }
267
268 static ssize_t counter_show(struct kobject *kobj,
269         struct kobj_attribute *attr, char *buf)
270 {
271         int index = attr - counter_attrs;
272         int size;
273         acpi_handle handle;
274         acpi_event_status status;
275         int result = 0;
276
277         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
278                 acpi_irq_handled;
279         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
280                 acpi_gpe_count;
281
282         size = sprintf(buf, "%8d", all_counters[index].count);
283
284         /* "gpe_all" or "sci" */
285         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
286                 goto end;
287
288         result = get_status(index, &status, &handle);
289         if (result)
290                 goto end;
291
292         if (!(status & ACPI_EVENT_FLAG_HANDLE))
293                 size += sprintf(buf + size, "   invalid");
294         else if (status & ACPI_EVENT_FLAG_ENABLED)
295                 size += sprintf(buf + size, "   enabled");
296         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
297                 size += sprintf(buf + size, "   wake_enabled");
298         else
299                 size += sprintf(buf + size, "   disabled");
300
301 end:
302         size += sprintf(buf + size, "\n");
303         return result ? result : size;
304 }
305
306 /*
307  * counter_set() sets the specified counter.
308  * setting the total "sci" file to any value clears all counters.
309  * enable/disable/clear a gpe/fixed event in user space.
310  */
311 static ssize_t counter_set(struct kobject *kobj,
312         struct kobj_attribute *attr, const char *buf, size_t size)
313 {
314         int index = attr - counter_attrs;
315         acpi_event_status status;
316         acpi_handle handle;
317         int result = 0;
318
319         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
320                 int i;
321                 for (i = 0; i < num_counters; ++i)
322                         all_counters[i].count = 0;
323                 acpi_gpe_count = 0;
324                 acpi_irq_handled = 0;
325                 goto end;
326         }
327
328         /* show the event status for both GPEs and Fixed Events */
329         result = get_status(index, &status, &handle);
330         if (result)
331                 goto end;
332
333         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
334                 printk(KERN_WARNING PREFIX
335                         "Can not change Invalid GPE/Fixed Event status\n");
336                 return -EINVAL;
337         }
338
339         if (index < num_gpes) {
340                 if (!strcmp(buf, "disable\n") &&
341                                 (status & ACPI_EVENT_FLAG_ENABLED))
342                         result = acpi_disable_gpe(handle, index);
343                 else if (!strcmp(buf, "enable\n") &&
344                                 !(status & ACPI_EVENT_FLAG_ENABLED))
345                         result = acpi_enable_gpe(handle, index);
346                 else if (!strcmp(buf, "clear\n") &&
347                                 (status & ACPI_EVENT_FLAG_SET))
348                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
349                 else
350                         all_counters[index].count = strtoul(buf, NULL, 0);
351         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
352                 int event = index - num_gpes;
353                 if (!strcmp(buf, "disable\n") &&
354                                 (status & ACPI_EVENT_FLAG_ENABLED))
355                         result = acpi_disable_event(event, ACPI_NOT_ISR);
356                 else if (!strcmp(buf, "enable\n") &&
357                                 !(status & ACPI_EVENT_FLAG_ENABLED))
358                         result = acpi_enable_event(event, ACPI_NOT_ISR);
359                 else if (!strcmp(buf, "clear\n") &&
360                                 (status & ACPI_EVENT_FLAG_SET))
361                         result = acpi_clear_event(event);
362                 else
363                         all_counters[index].count = strtoul(buf, NULL, 0);
364         } else
365                 all_counters[index].count = strtoul(buf, NULL, 0);
366
367         if (ACPI_FAILURE(result))
368                 result = -EINVAL;
369 end:
370         return result ? result : size;
371 }
372
373 void acpi_irq_stats_init(void)
374 {
375         int i;
376
377         if (all_counters)
378                 return;
379
380         num_gpes = acpi_current_gpe_count;
381         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
382
383         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
384                         GFP_KERNEL);
385         if (all_attrs == NULL)
386                 return;
387
388         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
389                                 GFP_KERNEL);
390         if (all_counters == NULL)
391                 goto fail;
392
393         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
394                         GFP_KERNEL);
395         if (counter_attrs == NULL)
396                 goto fail;
397
398         for (i = 0; i < num_counters; ++i) {
399                 char buffer[12];
400                 char *name;
401
402                 if (i < num_gpes)
403                         sprintf(buffer, "gpe%02X", i);
404                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
405                         sprintf(buffer, "ff_pmtimer");
406                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
407                         sprintf(buffer, "ff_gbl_lock");
408                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
409                         sprintf(buffer, "ff_pwr_btn");
410                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
411                         sprintf(buffer, "ff_slp_btn");
412                 else if (i == num_gpes + ACPI_EVENT_RTC)
413                         sprintf(buffer, "ff_rt_clk");
414                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
415                         sprintf(buffer, "gpe_all");
416                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
417                         sprintf(buffer, "sci");
418                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
419                         sprintf(buffer, "error");
420                 else
421                         sprintf(buffer, "bug%02X", i);
422
423                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
424                 if (name == NULL)
425                         goto fail;
426                 strncpy(name, buffer, strlen(buffer) + 1);
427
428                 counter_attrs[i].attr.name = name;
429                 counter_attrs[i].attr.mode = 0644;
430                 counter_attrs[i].show = counter_show;
431                 counter_attrs[i].store = counter_set;
432
433                 all_attrs[i] = &counter_attrs[i].attr;
434         }
435
436         interrupt_stats_attr_group.attrs = all_attrs;
437         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
438                 return;
439
440 fail:
441         delete_gpe_attr_array();
442         return;
443 }
444
445 static void __exit interrupt_stats_exit(void)
446 {
447         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
448
449         delete_gpe_attr_array();
450
451         return;
452 }
453
454 /* --------------------------------------------------------------------------
455                               FS Interface (/proc)
456    -------------------------------------------------------------------------- */
457 #ifdef CONFIG_ACPI_PROCFS
458 #define ACPI_SYSTEM_FILE_INFO           "info"
459 #define ACPI_SYSTEM_FILE_EVENT          "event"
460 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
461 #define ACPI_SYSTEM_FILE_FADT           "fadt"
462
463 static int acpi_system_read_info(struct seq_file *seq, void *offset)
464 {
465
466         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
467         return 0;
468 }
469
470 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
471 {
472         return single_open(file, acpi_system_read_info, PDE(inode)->data);
473 }
474
475 static const struct file_operations acpi_system_info_ops = {
476         .owner = THIS_MODULE,
477         .open = acpi_system_info_open_fs,
478         .read = seq_read,
479         .llseek = seq_lseek,
480         .release = single_release,
481 };
482
483 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
484                                      loff_t *);
485
486 static const struct file_operations acpi_system_dsdt_ops = {
487         .owner = THIS_MODULE,
488         .read = acpi_system_read_dsdt,
489 };
490
491 static ssize_t
492 acpi_system_read_dsdt(struct file *file,
493                       char __user * buffer, size_t count, loff_t * ppos)
494 {
495         acpi_status status = AE_OK;
496         struct acpi_table_header *dsdt = NULL;
497         ssize_t res;
498
499         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
500         if (ACPI_FAILURE(status))
501                 return -ENODEV;
502
503         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
504
505         return res;
506 }
507
508 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
509                                      loff_t *);
510
511 static const struct file_operations acpi_system_fadt_ops = {
512         .owner = THIS_MODULE,
513         .read = acpi_system_read_fadt,
514 };
515
516 static ssize_t
517 acpi_system_read_fadt(struct file *file,
518                       char __user * buffer, size_t count, loff_t * ppos)
519 {
520         acpi_status status = AE_OK;
521         struct acpi_table_header *fadt = NULL;
522         ssize_t res;
523
524         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
525         if (ACPI_FAILURE(status))
526                 return -ENODEV;
527
528         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
529
530         return res;
531 }
532
533 static int acpi_system_procfs_init(void)
534 {
535         struct proc_dir_entry *entry;
536         int error = 0;
537
538         /* 'info' [R] */
539         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
540                             &acpi_system_info_ops);
541         if (!entry)
542                 goto Error;
543
544         /* 'dsdt' [R] */
545         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
546                             &acpi_system_dsdt_ops);
547         if (!entry)
548                 goto Error;
549
550         /* 'fadt' [R] */
551         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
552                             &acpi_system_fadt_ops);
553         if (!entry)
554                 goto Error;
555
556       Done:
557         return error;
558
559       Error:
560         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
561         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
562         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
563
564         error = -EFAULT;
565         goto Done;
566 }
567 #else
568 static int acpi_system_procfs_init(void)
569 {
570         return 0;
571 }
572 #endif
573
574 static int __init acpi_system_init(void)
575 {
576         int result = 0;
577
578         if (acpi_disabled)
579                 return 0;
580
581         result = acpi_system_procfs_init();
582         if (result)
583                 return result;
584
585         result = acpi_system_sysfs_init();
586
587         return result;
588 }
589
590 subsys_initcall(acpi_system_init);