Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
16ACPI_MODULE_NAME("debug");
17
18struct acpi_dlayer {
19 const char *name;
20 unsigned long value;
21};
22struct acpi_dlevel {
23 const char *name;
24 unsigned long value;
25};
26#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
27
28static 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
60static 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 -------------------------------------------------------------------------- */
98static 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
120static 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
139module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
140module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);
141
142static char trace_method_name[6];
143module_param_string(trace_method_name, trace_method_name, 6, 0644);
144static unsigned int trace_debug_layer;
145module_param(trace_debug_layer, uint, 0644);
146static unsigned int trace_debug_level;
147module_param(trace_debug_level, uint, 0644);
148
149static 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;
179exit:
180 return result;
181}
182
183static 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
196module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
197 NULL, 0644);
198
199/* --------------------------------------------------------------------------
200 DebugFS Interface
201 -------------------------------------------------------------------------- */
202
203static 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
248static const struct file_operations cm_fops = {
249 .write = cm_write,
250};
251
252static 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
267err:
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
280static 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
320static 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
325static 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
354static 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
364int __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
400int __init acpi_debug_init(void)
401{
402 acpi_debugfs_init();
403 acpi_procfs_init();
404 return 0;
405}