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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: dsmethod - Parser/Interpreter interface - control method parsing | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
1da177e4 LT |
45 | #include <acpi/amlcode.h> |
46 | #include <acpi/acdispat.h> | |
47 | #include <acpi/acinterp.h> | |
48 | #include <acpi/acnamesp.h> | |
defba1d8 | 49 | #include <acpi/acdisasm.h> |
1da177e4 | 50 | |
1da177e4 | 51 | #define _COMPONENT ACPI_DISPATCHER |
4be44fcd | 52 | ACPI_MODULE_NAME("dsmethod") |
1da177e4 | 53 | |
967440e3 BM |
54 | /* Local prototypes */ |
55 | static acpi_status | |
56 | acpi_ds_create_method_mutex(union acpi_operand_object *method_desc); | |
57 | ||
defba1d8 BM |
58 | /******************************************************************************* |
59 | * | |
60 | * FUNCTION: acpi_ds_method_error | |
61 | * | |
62 | * PARAMETERS: Status - Execution status | |
63 | * walk_state - Current state | |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
67 | * DESCRIPTION: Called on method error. Invoke the global exception handler if | |
68 | * present, dump the method data if the disassembler is configured | |
69 | * | |
70 | * Note: Allows the exception handler to change the status code | |
71 | * | |
72 | ******************************************************************************/ | |
967440e3 | 73 | |
defba1d8 BM |
74 | acpi_status |
75 | acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state) | |
76 | { | |
77 | ACPI_FUNCTION_ENTRY(); | |
78 | ||
79 | /* Ignore AE_OK and control exception codes */ | |
80 | ||
81 | if (ACPI_SUCCESS(status) || (status & AE_CODE_CONTROL)) { | |
82 | return (status); | |
83 | } | |
84 | ||
85 | /* Invoke the global exception handler */ | |
86 | ||
87 | if (acpi_gbl_exception_handler) { | |
52fc0b02 | 88 | |
defba1d8 BM |
89 | /* Exit the interpreter, allow handler to execute methods */ |
90 | ||
91 | acpi_ex_exit_interpreter(); | |
92 | ||
93 | /* | |
94 | * Handler can map the exception code to anything it wants, including | |
95 | * AE_OK, in which case the executing method will not be aborted. | |
96 | */ | |
97 | status = acpi_gbl_exception_handler(status, | |
98 | walk_state->method_node ? | |
99 | walk_state->method_node-> | |
100 | name.integer : 0, | |
101 | walk_state->opcode, | |
102 | walk_state->aml_offset, | |
103 | NULL); | |
b7f9f042 | 104 | acpi_ex_enter_interpreter(); |
defba1d8 BM |
105 | } |
106 | #ifdef ACPI_DISASSEMBLER | |
107 | if (ACPI_FAILURE(status)) { | |
52fc0b02 | 108 | |
defba1d8 BM |
109 | /* Display method locals/args if disassembler is present */ |
110 | ||
111 | acpi_dm_dump_method_info(status, walk_state, walk_state->op); | |
112 | } | |
113 | #endif | |
114 | ||
115 | return (status); | |
116 | } | |
117 | ||
967440e3 BM |
118 | /******************************************************************************* |
119 | * | |
120 | * FUNCTION: acpi_ds_create_method_mutex | |
121 | * | |
122 | * PARAMETERS: obj_desc - The method object | |
123 | * | |
124 | * RETURN: Status | |
125 | * | |
126 | * DESCRIPTION: Create a mutex object for a serialized control method | |
127 | * | |
128 | ******************************************************************************/ | |
129 | ||
130 | static acpi_status | |
131 | acpi_ds_create_method_mutex(union acpi_operand_object *method_desc) | |
132 | { | |
133 | union acpi_operand_object *mutex_desc; | |
134 | acpi_status status; | |
135 | ||
f6dd9221 | 136 | ACPI_FUNCTION_TRACE(ds_create_method_mutex); |
967440e3 BM |
137 | |
138 | /* Create the new mutex object */ | |
139 | ||
140 | mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX); | |
141 | if (!mutex_desc) { | |
142 | return_ACPI_STATUS(AE_NO_MEMORY); | |
143 | } | |
144 | ||
145 | /* Create the actual OS Mutex */ | |
146 | ||
147 | status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex); | |
148 | if (ACPI_FAILURE(status)) { | |
149 | return_ACPI_STATUS(status); | |
150 | } | |
151 | ||
152 | mutex_desc->mutex.sync_level = method_desc->method.sync_level; | |
153 | method_desc->method.mutex = mutex_desc; | |
154 | return_ACPI_STATUS(AE_OK); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /******************************************************************************* |
158 | * | |
159 | * FUNCTION: acpi_ds_begin_method_execution | |
160 | * | |
161 | * PARAMETERS: method_node - Node of the method | |
162 | * obj_desc - The method object | |
967440e3 BM |
163 | * walk_state - current state, NULL if not yet executing |
164 | * a method. | |
1da177e4 LT |
165 | * |
166 | * RETURN: Status | |
167 | * | |
168 | * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, | |
169 | * increments the thread count, and waits at the method semaphore | |
170 | * for clearance to execute. | |
171 | * | |
172 | ******************************************************************************/ | |
defba1d8 | 173 | |
1da177e4 | 174 | acpi_status |
967440e3 BM |
175 | acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, |
176 | union acpi_operand_object *obj_desc, | |
177 | struct acpi_walk_state *walk_state) | |
1da177e4 | 178 | { |
4be44fcd | 179 | acpi_status status = AE_OK; |
1da177e4 | 180 | |
b229cf92 | 181 | ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node); |
1da177e4 LT |
182 | |
183 | if (!method_node) { | |
4be44fcd | 184 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
185 | } |
186 | ||
aff8c277 RM |
187 | /* Prevent wraparound of thread count */ |
188 | ||
189 | if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { | |
b8e4d893 BM |
190 | ACPI_ERROR((AE_INFO, |
191 | "Method reached maximum reentrancy limit (255)")); | |
aff8c277 RM |
192 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); |
193 | } | |
194 | ||
1da177e4 | 195 | /* |
967440e3 | 196 | * If this method is serialized, we need to acquire the method mutex. |
1da177e4 | 197 | */ |
967440e3 | 198 | if (obj_desc->method.method_flags & AML_METHOD_SERIALIZED) { |
1da177e4 | 199 | /* |
967440e3 BM |
200 | * Create a mutex for the method if it is defined to be Serialized |
201 | * and a mutex has not already been created. We defer the mutex creation | |
202 | * until a method is actually executed, to minimize the object count | |
1da177e4 | 203 | */ |
967440e3 BM |
204 | if (!obj_desc->method.mutex) { |
205 | status = acpi_ds_create_method_mutex(obj_desc); | |
206 | if (ACPI_FAILURE(status)) { | |
207 | return_ACPI_STATUS(status); | |
1da177e4 LT |
208 | } |
209 | } | |
210 | ||
211 | /* | |
967440e3 BM |
212 | * The current_sync_level (per-thread) must be less than or equal to |
213 | * the sync level of the method. This mechanism provides some | |
214 | * deadlock prevention | |
215 | * | |
216 | * Top-level method invocation has no walk state at this point | |
1da177e4 | 217 | */ |
967440e3 BM |
218 | if (walk_state && |
219 | (walk_state->thread->current_sync_level > | |
220 | obj_desc->method.mutex->mutex.sync_level)) { | |
221 | ACPI_ERROR((AE_INFO, | |
222 | "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%d)", | |
223 | acpi_ut_get_node_name(method_node), | |
224 | walk_state->thread->current_sync_level)); | |
225 | ||
226 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); | |
b229cf92 | 227 | } |
967440e3 BM |
228 | |
229 | /* | |
230 | * Obtain the method mutex if necessary. Do not acquire mutex for a | |
231 | * recursive call. | |
232 | */ | |
262a7a28 | 233 | if (!walk_state || |
ba886cd4 BM |
234 | !obj_desc->method.mutex->mutex.thread_id || |
235 | (walk_state->thread->thread_id != | |
236 | obj_desc->method.mutex->mutex.thread_id)) { | |
967440e3 BM |
237 | /* |
238 | * Acquire the method mutex. This releases the interpreter if we | |
239 | * block (and reacquires it before it returns) | |
240 | */ | |
241 | status = | |
242 | acpi_ex_system_wait_mutex(obj_desc->method.mutex-> | |
243 | mutex.os_mutex, | |
244 | ACPI_WAIT_FOREVER); | |
245 | if (ACPI_FAILURE(status)) { | |
246 | return_ACPI_STATUS(status); | |
247 | } | |
248 | ||
249 | /* Update the mutex and walk info and save the original sync_level */ | |
250 | ||
251 | if (walk_state) { | |
252 | obj_desc->method.mutex->mutex. | |
253 | original_sync_level = | |
254 | walk_state->thread->current_sync_level; | |
255 | ||
ba886cd4 BM |
256 | obj_desc->method.mutex->mutex.thread_id = |
257 | walk_state->thread->thread_id; | |
967440e3 BM |
258 | walk_state->thread->current_sync_level = |
259 | obj_desc->method.sync_level; | |
260 | } else { | |
261 | obj_desc->method.mutex->mutex. | |
262 | original_sync_level = | |
263 | obj_desc->method.mutex->mutex.sync_level; | |
264 | } | |
265 | } | |
266 | ||
267 | /* Always increase acquisition depth */ | |
268 | ||
269 | obj_desc->method.mutex->mutex.acquisition_depth++; | |
1da177e4 LT |
270 | } |
271 | ||
aff8c277 RM |
272 | /* |
273 | * Allocate an Owner ID for this method, only if this is the first thread | |
274 | * to begin concurrent execution. We only need one owner_id, even if the | |
275 | * method is invoked recursively. | |
276 | */ | |
277 | if (!obj_desc->method.owner_id) { | |
278 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
279 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 280 | goto cleanup; |
aff8c277 RM |
281 | } |
282 | } | |
283 | ||
1da177e4 LT |
284 | /* |
285 | * Increment the method parse tree thread count since it has been | |
286 | * reentered one more time (even if it is the same thread) | |
287 | */ | |
288 | obj_desc->method.thread_count++; | |
4be44fcd | 289 | return_ACPI_STATUS(status); |
b229cf92 BM |
290 | |
291 | cleanup: | |
967440e3 | 292 | /* On error, must release the method mutex (if present) */ |
b229cf92 | 293 | |
967440e3 BM |
294 | if (obj_desc->method.mutex) { |
295 | acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex); | |
b229cf92 BM |
296 | } |
297 | return_ACPI_STATUS(status); | |
1da177e4 LT |
298 | } |
299 | ||
1da177e4 LT |
300 | /******************************************************************************* |
301 | * | |
302 | * FUNCTION: acpi_ds_call_control_method | |
303 | * | |
304 | * PARAMETERS: Thread - Info for this thread | |
305 | * this_walk_state - Current walk state | |
306 | * Op - Current Op to be walked | |
307 | * | |
308 | * RETURN: Status | |
309 | * | |
310 | * DESCRIPTION: Transfer execution to a called control method | |
311 | * | |
312 | ******************************************************************************/ | |
313 | ||
314 | acpi_status | |
4be44fcd LB |
315 | acpi_ds_call_control_method(struct acpi_thread_state *thread, |
316 | struct acpi_walk_state *this_walk_state, | |
317 | union acpi_parse_object *op) | |
1da177e4 | 318 | { |
4be44fcd LB |
319 | acpi_status status; |
320 | struct acpi_namespace_node *method_node; | |
321 | struct acpi_walk_state *next_walk_state = NULL; | |
322 | union acpi_operand_object *obj_desc; | |
4119532c | 323 | struct acpi_evaluate_info *info; |
4be44fcd | 324 | u32 i; |
1da177e4 | 325 | |
b229cf92 | 326 | ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state); |
1da177e4 | 327 | |
4be44fcd | 328 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
9bc75cff | 329 | "Calling method %p, currentstate=%p\n", |
4be44fcd | 330 | this_walk_state->prev_op, this_walk_state)); |
1da177e4 LT |
331 | |
332 | /* | |
333 | * Get the namespace entry for the control method we are about to call | |
334 | */ | |
335 | method_node = this_walk_state->method_call_node; | |
336 | if (!method_node) { | |
4be44fcd | 337 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
338 | } |
339 | ||
4be44fcd | 340 | obj_desc = acpi_ns_get_attached_object(method_node); |
1da177e4 | 341 | if (!obj_desc) { |
4be44fcd | 342 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
343 | } |
344 | ||
967440e3 | 345 | /* Init for new method, possibly wait on method mutex */ |
1da177e4 | 346 | |
4be44fcd | 347 | status = acpi_ds_begin_method_execution(method_node, obj_desc, |
967440e3 | 348 | this_walk_state); |
4be44fcd | 349 | if (ACPI_FAILURE(status)) { |
b229cf92 | 350 | return_ACPI_STATUS(status); |
1da177e4 LT |
351 | } |
352 | ||
9bc75cff | 353 | /* Begin method parse/execution. Create a new walk state */ |
1da177e4 | 354 | |
4be44fcd LB |
355 | next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id, |
356 | NULL, obj_desc, thread); | |
1da177e4 LT |
357 | if (!next_walk_state) { |
358 | status = AE_NO_MEMORY; | |
359 | goto cleanup; | |
360 | } | |
b229cf92 | 361 | |
1da177e4 LT |
362 | /* |
363 | * The resolved arguments were put on the previous walk state's operand | |
aff8c277 RM |
364 | * stack. Operands on the previous walk state stack always |
365 | * start at index 0. Also, null terminate the list of arguments | |
1da177e4 | 366 | */ |
4be44fcd | 367 | this_walk_state->operands[this_walk_state->num_operands] = NULL; |
1da177e4 | 368 | |
4119532c BM |
369 | /* |
370 | * Allocate and initialize the evaluation information block | |
371 | * TBD: this is somewhat inefficient, should change interface to | |
372 | * ds_init_aml_walk. For now, keeps this struct off the CPU stack | |
373 | */ | |
374 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
375 | if (!info) { | |
376 | return_ACPI_STATUS(AE_NO_MEMORY); | |
377 | } | |
378 | ||
379 | info->parameters = &this_walk_state->operands[0]; | |
380 | info->parameter_type = ACPI_PARAM_ARGS; | |
1da177e4 | 381 | |
4be44fcd LB |
382 | status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
383 | obj_desc->method.aml_start, | |
ec3153fb BM |
384 | obj_desc->method.aml_length, info, |
385 | ACPI_IMODE_EXECUTE); | |
4119532c BM |
386 | |
387 | ACPI_FREE(info); | |
4be44fcd | 388 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
389 | goto cleanup; |
390 | } | |
391 | ||
392 | /* | |
393 | * Delete the operands on the previous walkstate operand stack | |
394 | * (they were copied to new objects) | |
395 | */ | |
396 | for (i = 0; i < obj_desc->method.param_count; i++) { | |
4be44fcd LB |
397 | acpi_ut_remove_reference(this_walk_state->operands[i]); |
398 | this_walk_state->operands[i] = NULL; | |
1da177e4 LT |
399 | } |
400 | ||
401 | /* Clear the operand stack */ | |
402 | ||
403 | this_walk_state->num_operands = 0; | |
404 | ||
4be44fcd | 405 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
9bc75cff VP |
406 | "**** Begin nested execution of [%4.4s] **** WalkState=%p\n", |
407 | method_node->name.ascii, next_walk_state)); | |
1da177e4 | 408 | |
b229cf92 BM |
409 | /* Invoke an internal method if necessary */ |
410 | ||
1da177e4 | 411 | if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) { |
4be44fcd | 412 | status = obj_desc->method.implementation(next_walk_state); |
1da177e4 LT |
413 | } |
414 | ||
aff8c277 | 415 | return_ACPI_STATUS(status); |
a94f1881 LB |
416 | |
417 | cleanup: | |
a94f1881 | 418 | |
b229cf92 | 419 | /* On error, we must terminate the method properly */ |
aff8c277 | 420 | |
b229cf92 BM |
421 | acpi_ds_terminate_control_method(obj_desc, next_walk_state); |
422 | if (next_walk_state) { | |
423 | acpi_ds_delete_walk_state(next_walk_state); | |
424 | } | |
aff8c277 | 425 | |
4be44fcd | 426 | return_ACPI_STATUS(status); |
1da177e4 LT |
427 | } |
428 | ||
1da177e4 LT |
429 | /******************************************************************************* |
430 | * | |
431 | * FUNCTION: acpi_ds_restart_control_method | |
432 | * | |
433 | * PARAMETERS: walk_state - State for preempted method (caller) | |
434 | * return_desc - Return value from the called method | |
435 | * | |
436 | * RETURN: Status | |
437 | * | |
438 | * DESCRIPTION: Restart a method that was preempted by another (nested) method | |
439 | * invocation. Handle the return value (if any) from the callee. | |
440 | * | |
441 | ******************************************************************************/ | |
442 | ||
443 | acpi_status | |
4be44fcd LB |
444 | acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
445 | union acpi_operand_object *return_desc) | |
1da177e4 | 446 | { |
4be44fcd | 447 | acpi_status status; |
958dd242 | 448 | int same_as_implicit_return; |
1da177e4 | 449 | |
b229cf92 | 450 | ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state); |
1da177e4 | 451 | |
4be44fcd | 452 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
b229cf92 | 453 | "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n", |
f6dd9221 | 454 | acpi_ut_get_node_name(walk_state->method_node), |
4be44fcd | 455 | walk_state->method_call_op, return_desc)); |
1da177e4 | 456 | |
4be44fcd | 457 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
b229cf92 | 458 | " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n", |
4be44fcd LB |
459 | walk_state->return_used, |
460 | walk_state->results, walk_state)); | |
1da177e4 LT |
461 | |
462 | /* Did the called method return a value? */ | |
463 | ||
464 | if (return_desc) { | |
52fc0b02 | 465 | |
958dd242 BM |
466 | /* Is the implicit return object the same as the return desc? */ |
467 | ||
468 | same_as_implicit_return = | |
469 | (walk_state->implicit_return_obj == return_desc); | |
470 | ||
1da177e4 LT |
471 | /* Are we actually going to use the return value? */ |
472 | ||
473 | if (walk_state->return_used) { | |
52fc0b02 | 474 | |
1da177e4 LT |
475 | /* Save the return value from the previous method */ |
476 | ||
4be44fcd LB |
477 | status = acpi_ds_result_push(return_desc, walk_state); |
478 | if (ACPI_FAILURE(status)) { | |
479 | acpi_ut_remove_reference(return_desc); | |
480 | return_ACPI_STATUS(status); | |
1da177e4 LT |
481 | } |
482 | ||
483 | /* | |
484 | * Save as THIS method's return value in case it is returned | |
485 | * immediately to yet another method | |
486 | */ | |
487 | walk_state->return_desc = return_desc; | |
488 | } | |
489 | ||
490 | /* | |
958dd242 BM |
491 | * The following code is the optional support for the so-called |
492 | * "implicit return". Some AML code assumes that the last value of the | |
493 | * method is "implicitly" returned to the caller, in the absence of an | |
494 | * explicit return value. | |
495 | * | |
496 | * Just save the last result of the method as the return value. | |
497 | * | |
1da177e4 LT |
498 | * NOTE: this is optional because the ASL language does not actually |
499 | * support this behavior. | |
500 | */ | |
4be44fcd | 501 | else if (!acpi_ds_do_implicit_return |
958dd242 BM |
502 | (return_desc, walk_state, FALSE) |
503 | || same_as_implicit_return) { | |
1da177e4 LT |
504 | /* |
505 | * Delete the return value if it will not be used by the | |
958dd242 BM |
506 | * calling method or remove one reference if the explicit return |
507 | * is the same as the implicit return value. | |
1da177e4 | 508 | */ |
4be44fcd | 509 | acpi_ut_remove_reference(return_desc); |
1da177e4 LT |
510 | } |
511 | } | |
512 | ||
4be44fcd | 513 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
514 | } |
515 | ||
1da177e4 LT |
516 | /******************************************************************************* |
517 | * | |
518 | * FUNCTION: acpi_ds_terminate_control_method | |
519 | * | |
b229cf92 BM |
520 | * PARAMETERS: method_desc - Method object |
521 | * walk_state - State associated with the method | |
1da177e4 | 522 | * |
aff8c277 | 523 | * RETURN: None |
1da177e4 LT |
524 | * |
525 | * DESCRIPTION: Terminate a control method. Delete everything that the method | |
526 | * created, delete all locals and arguments, and delete the parse | |
527 | * tree if requested. | |
528 | * | |
967440e3 BM |
529 | * MUTEX: Interpreter is locked |
530 | * | |
1da177e4 LT |
531 | ******************************************************************************/ |
532 | ||
b229cf92 BM |
533 | void |
534 | acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, | |
535 | struct acpi_walk_state *walk_state) | |
1da177e4 | 536 | { |
1da177e4 | 537 | |
b229cf92 | 538 | ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state); |
1da177e4 | 539 | |
b229cf92 | 540 | /* method_desc is required, walk_state is optional */ |
1da177e4 | 541 | |
b229cf92 | 542 | if (!method_desc) { |
aff8c277 | 543 | return_VOID; |
1da177e4 LT |
544 | } |
545 | ||
b229cf92 | 546 | if (walk_state) { |
1da177e4 | 547 | |
b229cf92 BM |
548 | /* Delete all arguments and locals */ |
549 | ||
550 | acpi_ds_method_data_delete_all(walk_state); | |
1da177e4 | 551 | |
b7f9f042 BM |
552 | /* |
553 | * If method is serialized, release the mutex and restore the | |
554 | * current sync level for this thread | |
555 | */ | |
556 | if (method_desc->method.mutex) { | |
1da177e4 | 557 | |
b7f9f042 | 558 | /* Acquisition Depth handles recursive calls */ |
1da177e4 | 559 | |
b7f9f042 BM |
560 | method_desc->method.mutex->mutex.acquisition_depth--; |
561 | if (!method_desc->method.mutex->mutex.acquisition_depth) { | |
562 | walk_state->thread->current_sync_level = | |
563 | method_desc->method.mutex->mutex. | |
564 | original_sync_level; | |
b229cf92 | 565 | |
b7f9f042 BM |
566 | acpi_os_release_mutex(method_desc->method. |
567 | mutex->mutex.os_mutex); | |
568 | method_desc->method.mutex->mutex.thread_id = 0; | |
569 | } | |
1da177e4 | 570 | } |
1da177e4 | 571 | |
b229cf92 | 572 | /* |
f6dd9221 | 573 | * Delete any namespace objects created anywhere within |
b229cf92 BM |
574 | * the namespace by the execution of this method |
575 | */ | |
576 | acpi_ns_delete_namespace_by_owner(method_desc->method.owner_id); | |
28f55ebc BM |
577 | } |
578 | ||
b229cf92 BM |
579 | /* Decrement the thread count on the method */ |
580 | ||
581 | if (method_desc->method.thread_count) { | |
582 | method_desc->method.thread_count--; | |
583 | } else { | |
584 | ACPI_ERROR((AE_INFO, "Invalid zero thread count in method")); | |
585 | } | |
28f55ebc BM |
586 | |
587 | /* Are there any other threads currently executing this method? */ | |
588 | ||
b229cf92 | 589 | if (method_desc->method.thread_count) { |
28f55ebc BM |
590 | /* |
591 | * Additional threads. Do not release the owner_id in this case, | |
592 | * we immediately reuse it for the next thread executing this method | |
593 | */ | |
4be44fcd | 594 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
28f55ebc | 595 | "*** Completed execution of one thread, %d threads remaining\n", |
b229cf92 | 596 | method_desc->method.thread_count)); |
28f55ebc BM |
597 | } else { |
598 | /* This is the only executing thread for this method */ | |
1da177e4 | 599 | |
1da177e4 LT |
600 | /* |
601 | * Support to dynamically change a method from not_serialized to | |
28f55ebc | 602 | * Serialized if it appears that the method is incorrectly written and |
967440e3 BM |
603 | * does not support multiple thread execution. The best example of this |
604 | * is if such a method creates namespace objects and blocks. A second | |
1da177e4 LT |
605 | * thread will fail with an AE_ALREADY_EXISTS exception |
606 | * | |
607 | * This code is here because we must wait until the last thread exits | |
608 | * before creating the synchronization semaphore. | |
609 | */ | |
967440e3 BM |
610 | if ((method_desc->method.method_flags & AML_METHOD_SERIALIZED) |
611 | && (!method_desc->method.mutex)) { | |
b7f9f042 | 612 | (void)acpi_ds_create_method_mutex(method_desc); |
1da177e4 LT |
613 | } |
614 | ||
28f55ebc | 615 | /* No more threads, we can free the owner_id */ |
1da177e4 | 616 | |
b229cf92 | 617 | acpi_ut_release_owner_id(&method_desc->method.owner_id); |
1da177e4 | 618 | } |
a94f1881 | 619 | |
aff8c277 | 620 | return_VOID; |
1da177e4 | 621 | } |