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44#include <acpi/acpi.h>
45#include "accommon.h"
46
47#define _COMPONENT ACPI_UTILITIES
48ACPI_MODULE_NAME("utmutex")
49
50
51static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
52
53static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
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67
68acpi_status acpi_ut_mutex_initialize(void)
69{
70 u32 i;
71 acpi_status status;
72
73 ACPI_FUNCTION_TRACE(ut_mutex_initialize);
74
75
76
77 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
78 status = acpi_ut_create_mutex(i);
79 if (ACPI_FAILURE(status)) {
80 return_ACPI_STATUS(status);
81 }
82 }
83
84
85
86 spin_lock_init(acpi_gbl_gpe_lock);
87 spin_lock_init(acpi_gbl_hardware_lock);
88
89
90
91 status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
92 return_ACPI_STATUS(status);
93}
94
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106
107
108void acpi_ut_mutex_terminate(void)
109{
110 u32 i;
111
112 ACPI_FUNCTION_TRACE(ut_mutex_terminate);
113
114
115
116 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
117 (void)acpi_ut_delete_mutex(i);
118 }
119
120
121
122 acpi_os_delete_lock(acpi_gbl_gpe_lock);
123 acpi_os_delete_lock(acpi_gbl_hardware_lock);
124
125
126
127 acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
128 return_VOID;
129}
130
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141
142
143static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
144{
145 acpi_status status = AE_OK;
146
147 ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
148
149 if (mutex_id > ACPI_MAX_MUTEX) {
150 return_ACPI_STATUS(AE_BAD_PARAMETER);
151 }
152
153 if (!acpi_gbl_mutex_info[mutex_id].mutex) {
154 status =
155 acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
156 acpi_gbl_mutex_info[mutex_id].thread_id =
157 ACPI_MUTEX_NOT_ACQUIRED;
158 acpi_gbl_mutex_info[mutex_id].use_count = 0;
159 }
160
161 return_ACPI_STATUS(status);
162}
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175
176static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
177{
178
179 ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
180
181 if (mutex_id > ACPI_MAX_MUTEX) {
182 return_ACPI_STATUS(AE_BAD_PARAMETER);
183 }
184
185 acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
186
187 acpi_gbl_mutex_info[mutex_id].mutex = NULL;
188 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
189
190 return_ACPI_STATUS(AE_OK);
191}
192
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204
205acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
206{
207 acpi_status status;
208 acpi_thread_id this_thread_id;
209
210 ACPI_FUNCTION_NAME(ut_acquire_mutex);
211
212 if (mutex_id > ACPI_MAX_MUTEX) {
213 return (AE_BAD_PARAMETER);
214 }
215
216 this_thread_id = acpi_os_get_thread_id();
217
218#ifdef ACPI_MUTEX_DEBUG
219 {
220 u32 i;
221
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227
228
229 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
230 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
231 if (i == mutex_id) {
232 ACPI_ERROR((AE_INFO,
233 "Mutex [%s] already acquired by this thread [%p]",
234 acpi_ut_get_mutex_name
235 (mutex_id),
236 ACPI_CAST_PTR(void,
237 this_thread_id)));
238
239 return (AE_ALREADY_ACQUIRED);
240 }
241
242 ACPI_ERROR((AE_INFO,
243 "Invalid acquire order: Thread %p owns [%s], wants [%s]",
244 ACPI_CAST_PTR(void, this_thread_id),
245 acpi_ut_get_mutex_name(i),
246 acpi_ut_get_mutex_name(mutex_id)));
247
248 return (AE_ACQUIRE_DEADLOCK);
249 }
250 }
251 }
252#endif
253
254 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
255 "Thread %p attempting to acquire Mutex [%s]\n",
256 ACPI_CAST_PTR(void, this_thread_id),
257 acpi_ut_get_mutex_name(mutex_id)));
258
259 status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
260 ACPI_WAIT_FOREVER);
261 if (ACPI_SUCCESS(status)) {
262 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
263 "Thread %p acquired Mutex [%s]\n",
264 ACPI_CAST_PTR(void, this_thread_id),
265 acpi_ut_get_mutex_name(mutex_id)));
266
267 acpi_gbl_mutex_info[mutex_id].use_count++;
268 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
269 } else {
270 ACPI_EXCEPTION((AE_INFO, status,
271 "Thread %p could not acquire Mutex [%X]",
272 ACPI_CAST_PTR(void, this_thread_id), mutex_id));
273 }
274
275 return (status);
276}
277
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290acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
291{
292 acpi_thread_id this_thread_id;
293
294 ACPI_FUNCTION_NAME(ut_release_mutex);
295
296 this_thread_id = acpi_os_get_thread_id();
297 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %p releasing Mutex [%s]\n",
298 ACPI_CAST_PTR(void, this_thread_id),
299 acpi_ut_get_mutex_name(mutex_id)));
300
301 if (mutex_id > ACPI_MAX_MUTEX) {
302 return (AE_BAD_PARAMETER);
303 }
304
305
306
307
308 if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
309 ACPI_ERROR((AE_INFO,
310 "Mutex [%X] is not acquired, cannot release",
311 mutex_id));
312
313 return (AE_NOT_ACQUIRED);
314 }
315#ifdef ACPI_MUTEX_DEBUG
316 {
317 u32 i;
318
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324
325
326 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
327 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
328 if (i == mutex_id) {
329 continue;
330 }
331
332 ACPI_ERROR((AE_INFO,
333 "Invalid release order: owns [%s], releasing [%s]",
334 acpi_ut_get_mutex_name(i),
335 acpi_ut_get_mutex_name(mutex_id)));
336
337 return (AE_RELEASE_DEADLOCK);
338 }
339 }
340 }
341#endif
342
343
344
345 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
346
347 acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
348 return (AE_OK);
349}
350