Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / acpi / debug.c
1 /*
2  * debug.c - ACPI debug interface to userspace.
3  */
4
5 #include <linux/proc_fs.h>
6 #include <linux/seq_file.h>
7 #include <linux/init.h>
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/moduleparam.h>
11 #include <linux/debugfs.h>
12 #include <asm/uaccess.h>
13 #include <acpi/acpi_drivers.h>
14
15 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
16 ACPI_MODULE_NAME("debug");
17
18 struct acpi_dlayer {
19         const char *name;
20         unsigned long value;
21 };
22 struct acpi_dlevel {
23         const char *name;
24         unsigned long value;
25 };
26 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
27
28 static const struct acpi_dlayer acpi_debug_layers[] = {
29         ACPI_DEBUG_INIT(ACPI_UTILITIES),
30         ACPI_DEBUG_INIT(ACPI_HARDWARE),
31         ACPI_DEBUG_INIT(ACPI_EVENTS),
32         ACPI_DEBUG_INIT(ACPI_TABLES),
33         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
34         ACPI_DEBUG_INIT(ACPI_PARSER),
35         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
36         ACPI_DEBUG_INIT(ACPI_EXECUTER),
37         ACPI_DEBUG_INIT(ACPI_RESOURCES),
38         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
39         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
40         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
41         ACPI_DEBUG_INIT(ACPI_COMPILER),
42         ACPI_DEBUG_INIT(ACPI_TOOLS),
43
44         ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
45         ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
46         ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
47         ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
48         ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
49         ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
50         ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
51         ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
52         ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
53         ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
54         ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
55         ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
56         ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
57         ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
58 };
59
60 static const struct acpi_dlevel acpi_debug_levels[] = {
61         ACPI_DEBUG_INIT(ACPI_LV_INIT),
62         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
63         ACPI_DEBUG_INIT(ACPI_LV_INFO),
64
65         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
66         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
67         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
68         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
69         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
70         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
71         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
72         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
73         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
74         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
75         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
76         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
77         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
78         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
79
80         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
81         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
82         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
83
84         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
85         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
86         ACPI_DEBUG_INIT(ACPI_LV_IO),
87         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
88
89         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
90         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
91         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
92         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
93 };
94
95 /* --------------------------------------------------------------------------
96                               FS Interface (/sys)
97    -------------------------------------------------------------------------- */
98 static int param_get_debug_layer(char *buffer, struct kernel_param *kp) {
99         int result = 0;
100         int i;
101
102         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
103
104         for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
105                 result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
106                                         acpi_debug_layers[i].name,
107                                         acpi_debug_layers[i].value,
108                                         (acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
109         }
110         result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
111                                         ACPI_ALL_DRIVERS,
112                                         (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
113                                         ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
114                                         ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
115         result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);
116
117         return result;
118 }
119
120 static int param_get_debug_level(char *buffer, struct kernel_param *kp) {
121         int result = 0;
122         int i;
123
124         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
125
126         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
127                 result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
128                                      acpi_debug_levels[i].name,
129                                      acpi_debug_levels[i].value,
130                                      (acpi_dbg_level & acpi_debug_levels[i].
131                                       value) ? '*' : ' ');
132         }
133         result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
134                              acpi_dbg_level);
135
136         return result;
137 }
138
139 module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
140 module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);
141
142 static char trace_method_name[6];
143 module_param_string(trace_method_name, trace_method_name, 6, 0644);
144 static unsigned int trace_debug_layer;
145 module_param(trace_debug_layer, uint, 0644);
146 static unsigned int trace_debug_level;
147 module_param(trace_debug_level, uint, 0644);
148
149 static int param_set_trace_state(const char *val, struct kernel_param *kp)
150 {
151         int result = 0;
152
153         if (!strncmp(val, "enable", strlen("enable") - 1)) {
154                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
155                                           trace_debug_layer, 0);
156                 if (result)
157                         result = -EBUSY;
158                 goto exit;
159         }
160
161         if (!strncmp(val, "disable", strlen("disable") - 1)) {
162                 int name = 0;
163                 result = acpi_debug_trace((char *)&name, trace_debug_level,
164                                           trace_debug_layer, 0);
165                 if (result)
166                         result = -EBUSY;
167                 goto exit;
168         }
169
170         if (!strncmp(val, "1", 1)) {
171                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
172                                           trace_debug_layer, 1);
173                 if (result)
174                         result = -EBUSY;
175                 goto exit;
176         }
177
178         result = -EINVAL;
179 exit:
180         return result;
181 }
182
183 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
184 {
185         if (!acpi_gbl_trace_method_name)
186                 return sprintf(buffer, "disable");
187         else {
188                 if (acpi_gbl_trace_flags & 1)
189                         return sprintf(buffer, "1");
190                 else
191                         return sprintf(buffer, "enable");
192         }
193         return 0;
194 }
195
196 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
197                   NULL, 0644);
198
199 /* --------------------------------------------------------------------------
200                                 DebugFS Interface
201    -------------------------------------------------------------------------- */
202
203 static ssize_t cm_write(struct file *file, const char __user *user_buf,
204                         size_t count, loff_t *ppos)
205 {
206         static char *buf;
207         static int uncopied_bytes;
208         struct acpi_table_header table;
209         acpi_status status;
210
211         if (!(*ppos)) {
212                 /* parse the table header to get the table length */
213                 if (count <= sizeof(struct acpi_table_header))
214                         return -EINVAL;
215                 if (copy_from_user(&table, user_buf,
216                         sizeof(struct acpi_table_header)))
217                         return -EFAULT;
218                 uncopied_bytes = table.length;
219                 buf = kzalloc(uncopied_bytes, GFP_KERNEL);
220                 if (!buf)
221                         return -ENOMEM;
222         }
223
224         if (uncopied_bytes < count) {
225                 kfree(buf);
226                 return -EINVAL;
227         }
228
229         if (copy_from_user(buf + (*ppos), user_buf, count)) {
230                 kfree(buf);
231                 return -EFAULT;
232         }
233
234         uncopied_bytes -= count;
235         *ppos += count;
236
237         if (!uncopied_bytes) {
238                 status = acpi_install_method(buf);
239                 kfree(buf);
240                 if (ACPI_FAILURE(status))
241                         return -EINVAL;
242                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
243         }
244
245         return count;
246 }
247
248 static const struct file_operations cm_fops = {
249         .write = cm_write,
250 };
251
252 static int acpi_debugfs_init(void)
253 {
254         struct dentry *acpi_dir, *cm_dentry;
255
256         acpi_dir = debugfs_create_dir("acpi", NULL);
257         if (!acpi_dir)
258                 goto err;
259
260         cm_dentry = debugfs_create_file("custom_method", S_IWUGO,
261                                         acpi_dir, NULL, &cm_fops);
262         if (!cm_dentry)
263                 goto err;
264
265         return 0;
266
267 err:
268         if (acpi_dir)
269                 debugfs_remove(acpi_dir);
270         return -EINVAL;
271 }
272
273 /* --------------------------------------------------------------------------
274                               FS Interface (/proc)
275    -------------------------------------------------------------------------- */
276 #ifdef CONFIG_ACPI_PROCFS
277 #define ACPI_SYSTEM_FILE_DEBUG_LAYER    "debug_layer"
278 #define ACPI_SYSTEM_FILE_DEBUG_LEVEL            "debug_level"
279
280 static int acpi_system_debug_proc_show(struct seq_file *m, void *v)
281 {
282         unsigned int i;
283
284         seq_printf(m, "%-25s\tHex        SET\n", "Description");
285
286         switch ((unsigned long)m->private) {
287         case 0:
288                 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
289                         seq_printf(m, "%-25s\t0x%08lX [%c]\n",
290                                      acpi_debug_layers[i].name,
291                                      acpi_debug_layers[i].value,
292                                      (acpi_dbg_layer & acpi_debug_layers[i].
293                                       value) ? '*' : ' ');
294                 }
295                 seq_printf(m, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
296                              ACPI_ALL_DRIVERS,
297                              (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
298                              ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
299                                                        ACPI_ALL_DRIVERS) ==
300                              0 ? ' ' : '-');
301                 seq_printf(m,
302                              "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
303                              acpi_dbg_layer);
304                 break;
305         case 1:
306                 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
307                         seq_printf(m, "%-25s\t0x%08lX [%c]\n",
308                                      acpi_debug_levels[i].name,
309                                      acpi_debug_levels[i].value,
310                                      (acpi_dbg_level & acpi_debug_levels[i].
311                                       value) ? '*' : ' ');
312                 }
313                 seq_printf(m, "--\ndebug_level = 0x%08X (* = enabled)\n",
314                              acpi_dbg_level);
315                 break;
316         }
317         return 0;
318 }
319
320 static int acpi_system_debug_proc_open(struct inode *inode, struct file *file)
321 {
322         return single_open(file, acpi_system_debug_proc_show, PDE(inode)->data);
323 }
324
325 static ssize_t acpi_system_debug_proc_write(struct file *file,
326                         const char __user * buffer,
327                         size_t count, loff_t *pos)
328 {
329         char debug_string[12] = { '\0' };
330
331
332         if (count > sizeof(debug_string) - 1)
333                 return -EINVAL;
334
335         if (copy_from_user(debug_string, buffer, count))
336                 return -EFAULT;
337
338         debug_string[count] = '\0';
339
340         switch ((unsigned long)PDE(file->f_path.dentry->d_inode)->data) {
341         case 0:
342                 acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
343                 break;
344         case 1:
345                 acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
346                 break;
347         default:
348                 return -EINVAL;
349         }
350
351         return count;
352 }
353
354 static const struct file_operations acpi_system_debug_proc_fops = {
355         .owner          = THIS_MODULE,
356         .open           = acpi_system_debug_proc_open,
357         .read           = seq_read,
358         .llseek         = seq_lseek,
359         .release        = single_release,
360         .write          = acpi_system_debug_proc_write,
361 };
362 #endif
363
364 int __init acpi_procfs_init(void)
365 {
366 #ifdef CONFIG_ACPI_PROCFS
367         struct proc_dir_entry *entry;
368         int error = 0;
369         char *name;
370
371         /* 'debug_layer' [R/W] */
372         name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
373         entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR,
374                                  acpi_root_dir, &acpi_system_debug_proc_fops,
375                                  (void *)0);
376         if (!entry)
377                 goto Error;
378
379         /* 'debug_level' [R/W] */
380         name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
381         entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR,
382                                  acpi_root_dir, &acpi_system_debug_proc_fops,
383                                  (void *)1);
384         if (!entry)
385                 goto Error;
386
387       Done:
388         return error;
389
390       Error:
391         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
392         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
393         error = -ENODEV;
394         goto Done;
395 #else
396         return 0;
397 #endif
398 }
399
400 int __init acpi_debug_init(void)
401 {
402         acpi_debugfs_init();
403         acpi_procfs_init();
404         return 0;
405 }