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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 | 105 | } |
d8a0ec91 LM |
106 | |
107 | acpi_ds_clear_implicit_return(walk_state); | |
108 | ||
defba1d8 BM |
109 | #ifdef ACPI_DISASSEMBLER |
110 | if (ACPI_FAILURE(status)) { | |
52fc0b02 | 111 | |
defba1d8 BM |
112 | /* Display method locals/args if disassembler is present */ |
113 | ||
114 | acpi_dm_dump_method_info(status, walk_state, walk_state->op); | |
115 | } | |
116 | #endif | |
117 | ||
118 | return (status); | |
119 | } | |
120 | ||
967440e3 BM |
121 | /******************************************************************************* |
122 | * | |
123 | * FUNCTION: acpi_ds_create_method_mutex | |
124 | * | |
125 | * PARAMETERS: obj_desc - The method object | |
126 | * | |
127 | * RETURN: Status | |
128 | * | |
129 | * DESCRIPTION: Create a mutex object for a serialized control method | |
130 | * | |
131 | ******************************************************************************/ | |
132 | ||
133 | static acpi_status | |
134 | acpi_ds_create_method_mutex(union acpi_operand_object *method_desc) | |
135 | { | |
136 | union acpi_operand_object *mutex_desc; | |
137 | acpi_status status; | |
138 | ||
f6dd9221 | 139 | ACPI_FUNCTION_TRACE(ds_create_method_mutex); |
967440e3 BM |
140 | |
141 | /* Create the new mutex object */ | |
142 | ||
143 | mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX); | |
144 | if (!mutex_desc) { | |
145 | return_ACPI_STATUS(AE_NO_MEMORY); | |
146 | } | |
147 | ||
148 | /* Create the actual OS Mutex */ | |
149 | ||
150 | status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex); | |
151 | if (ACPI_FAILURE(status)) { | |
152 | return_ACPI_STATUS(status); | |
153 | } | |
154 | ||
155 | mutex_desc->mutex.sync_level = method_desc->method.sync_level; | |
156 | method_desc->method.mutex = mutex_desc; | |
157 | return_ACPI_STATUS(AE_OK); | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /******************************************************************************* |
161 | * | |
162 | * FUNCTION: acpi_ds_begin_method_execution | |
163 | * | |
164 | * PARAMETERS: method_node - Node of the method | |
165 | * obj_desc - The method object | |
967440e3 BM |
166 | * walk_state - current state, NULL if not yet executing |
167 | * a method. | |
1da177e4 LT |
168 | * |
169 | * RETURN: Status | |
170 | * | |
171 | * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, | |
172 | * increments the thread count, and waits at the method semaphore | |
173 | * for clearance to execute. | |
174 | * | |
175 | ******************************************************************************/ | |
defba1d8 | 176 | |
1da177e4 | 177 | acpi_status |
967440e3 BM |
178 | acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, |
179 | union acpi_operand_object *obj_desc, | |
180 | struct acpi_walk_state *walk_state) | |
1da177e4 | 181 | { |
4be44fcd | 182 | acpi_status status = AE_OK; |
1da177e4 | 183 | |
b229cf92 | 184 | ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node); |
1da177e4 LT |
185 | |
186 | if (!method_node) { | |
4be44fcd | 187 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
188 | } |
189 | ||
aff8c277 RM |
190 | /* Prevent wraparound of thread count */ |
191 | ||
192 | if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { | |
b8e4d893 BM |
193 | ACPI_ERROR((AE_INFO, |
194 | "Method reached maximum reentrancy limit (255)")); | |
aff8c277 RM |
195 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); |
196 | } | |
197 | ||
1da177e4 | 198 | /* |
967440e3 | 199 | * If this method is serialized, we need to acquire the method mutex. |
1da177e4 | 200 | */ |
967440e3 | 201 | if (obj_desc->method.method_flags & AML_METHOD_SERIALIZED) { |
1da177e4 | 202 | /* |
967440e3 BM |
203 | * Create a mutex for the method if it is defined to be Serialized |
204 | * and a mutex has not already been created. We defer the mutex creation | |
205 | * until a method is actually executed, to minimize the object count | |
1da177e4 | 206 | */ |
967440e3 BM |
207 | if (!obj_desc->method.mutex) { |
208 | status = acpi_ds_create_method_mutex(obj_desc); | |
209 | if (ACPI_FAILURE(status)) { | |
210 | return_ACPI_STATUS(status); | |
1da177e4 LT |
211 | } |
212 | } | |
213 | ||
214 | /* | |
967440e3 BM |
215 | * The current_sync_level (per-thread) must be less than or equal to |
216 | * the sync level of the method. This mechanism provides some | |
217 | * deadlock prevention | |
218 | * | |
219 | * Top-level method invocation has no walk state at this point | |
1da177e4 | 220 | */ |
967440e3 BM |
221 | if (walk_state && |
222 | (walk_state->thread->current_sync_level > | |
223 | obj_desc->method.mutex->mutex.sync_level)) { | |
224 | ACPI_ERROR((AE_INFO, | |
225 | "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%d)", | |
226 | acpi_ut_get_node_name(method_node), | |
227 | walk_state->thread->current_sync_level)); | |
228 | ||
229 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); | |
b229cf92 | 230 | } |
967440e3 BM |
231 | |
232 | /* | |
233 | * Obtain the method mutex if necessary. Do not acquire mutex for a | |
234 | * recursive call. | |
235 | */ | |
262a7a28 | 236 | if (!walk_state || |
ba886cd4 BM |
237 | !obj_desc->method.mutex->mutex.thread_id || |
238 | (walk_state->thread->thread_id != | |
239 | obj_desc->method.mutex->mutex.thread_id)) { | |
967440e3 BM |
240 | /* |
241 | * Acquire the method mutex. This releases the interpreter if we | |
242 | * block (and reacquires it before it returns) | |
243 | */ | |
244 | status = | |
245 | acpi_ex_system_wait_mutex(obj_desc->method.mutex-> | |
246 | mutex.os_mutex, | |
247 | ACPI_WAIT_FOREVER); | |
248 | if (ACPI_FAILURE(status)) { | |
249 | return_ACPI_STATUS(status); | |
250 | } | |
251 | ||
252 | /* Update the mutex and walk info and save the original sync_level */ | |
253 | ||
254 | if (walk_state) { | |
255 | obj_desc->method.mutex->mutex. | |
256 | original_sync_level = | |
257 | walk_state->thread->current_sync_level; | |
258 | ||
ba886cd4 BM |
259 | obj_desc->method.mutex->mutex.thread_id = |
260 | walk_state->thread->thread_id; | |
967440e3 BM |
261 | walk_state->thread->current_sync_level = |
262 | obj_desc->method.sync_level; | |
263 | } else { | |
264 | obj_desc->method.mutex->mutex. | |
265 | original_sync_level = | |
266 | obj_desc->method.mutex->mutex.sync_level; | |
267 | } | |
268 | } | |
269 | ||
270 | /* Always increase acquisition depth */ | |
271 | ||
272 | obj_desc->method.mutex->mutex.acquisition_depth++; | |
1da177e4 LT |
273 | } |
274 | ||
aff8c277 RM |
275 | /* |
276 | * Allocate an Owner ID for this method, only if this is the first thread | |
277 | * to begin concurrent execution. We only need one owner_id, even if the | |
278 | * method is invoked recursively. | |
279 | */ | |
280 | if (!obj_desc->method.owner_id) { | |
281 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
282 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 283 | goto cleanup; |
aff8c277 RM |
284 | } |
285 | } | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * Increment the method parse tree thread count since it has been | |
289 | * reentered one more time (even if it is the same thread) | |
290 | */ | |
291 | obj_desc->method.thread_count++; | |
4be44fcd | 292 | return_ACPI_STATUS(status); |
b229cf92 BM |
293 | |
294 | cleanup: | |
967440e3 | 295 | /* On error, must release the method mutex (if present) */ |
b229cf92 | 296 | |
967440e3 BM |
297 | if (obj_desc->method.mutex) { |
298 | acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex); | |
b229cf92 BM |
299 | } |
300 | return_ACPI_STATUS(status); | |
1da177e4 LT |
301 | } |
302 | ||
1da177e4 LT |
303 | /******************************************************************************* |
304 | * | |
305 | * FUNCTION: acpi_ds_call_control_method | |
306 | * | |
307 | * PARAMETERS: Thread - Info for this thread | |
308 | * this_walk_state - Current walk state | |
309 | * Op - Current Op to be walked | |
310 | * | |
311 | * RETURN: Status | |
312 | * | |
313 | * DESCRIPTION: Transfer execution to a called control method | |
314 | * | |
315 | ******************************************************************************/ | |
316 | ||
317 | acpi_status | |
4be44fcd LB |
318 | acpi_ds_call_control_method(struct acpi_thread_state *thread, |
319 | struct acpi_walk_state *this_walk_state, | |
320 | union acpi_parse_object *op) | |
1da177e4 | 321 | { |
4be44fcd LB |
322 | acpi_status status; |
323 | struct acpi_namespace_node *method_node; | |
324 | struct acpi_walk_state *next_walk_state = NULL; | |
325 | union acpi_operand_object *obj_desc; | |
4119532c | 326 | struct acpi_evaluate_info *info; |
4be44fcd | 327 | u32 i; |
1da177e4 | 328 | |
b229cf92 | 329 | ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state); |
1da177e4 | 330 | |
4be44fcd | 331 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
9bc75cff | 332 | "Calling method %p, currentstate=%p\n", |
4be44fcd | 333 | this_walk_state->prev_op, this_walk_state)); |
1da177e4 LT |
334 | |
335 | /* | |
336 | * Get the namespace entry for the control method we are about to call | |
337 | */ | |
338 | method_node = this_walk_state->method_call_node; | |
339 | if (!method_node) { | |
4be44fcd | 340 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
341 | } |
342 | ||
4be44fcd | 343 | obj_desc = acpi_ns_get_attached_object(method_node); |
1da177e4 | 344 | if (!obj_desc) { |
4be44fcd | 345 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
346 | } |
347 | ||
967440e3 | 348 | /* Init for new method, possibly wait on method mutex */ |
1da177e4 | 349 | |
4be44fcd | 350 | status = acpi_ds_begin_method_execution(method_node, obj_desc, |
967440e3 | 351 | this_walk_state); |
4be44fcd | 352 | if (ACPI_FAILURE(status)) { |
b229cf92 | 353 | return_ACPI_STATUS(status); |
1da177e4 LT |
354 | } |
355 | ||
9bc75cff | 356 | /* Begin method parse/execution. Create a new walk state */ |
1da177e4 | 357 | |
4be44fcd LB |
358 | next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id, |
359 | NULL, obj_desc, thread); | |
1da177e4 LT |
360 | if (!next_walk_state) { |
361 | status = AE_NO_MEMORY; | |
362 | goto cleanup; | |
363 | } | |
b229cf92 | 364 | |
1da177e4 LT |
365 | /* |
366 | * The resolved arguments were put on the previous walk state's operand | |
aff8c277 RM |
367 | * stack. Operands on the previous walk state stack always |
368 | * start at index 0. Also, null terminate the list of arguments | |
1da177e4 | 369 | */ |
4be44fcd | 370 | this_walk_state->operands[this_walk_state->num_operands] = NULL; |
1da177e4 | 371 | |
4119532c BM |
372 | /* |
373 | * Allocate and initialize the evaluation information block | |
374 | * TBD: this is somewhat inefficient, should change interface to | |
375 | * ds_init_aml_walk. For now, keeps this struct off the CPU stack | |
376 | */ | |
377 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
378 | if (!info) { | |
379 | return_ACPI_STATUS(AE_NO_MEMORY); | |
380 | } | |
381 | ||
382 | info->parameters = &this_walk_state->operands[0]; | |
1da177e4 | 383 | |
4be44fcd LB |
384 | status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
385 | obj_desc->method.aml_start, | |
ec3153fb BM |
386 | obj_desc->method.aml_length, info, |
387 | ACPI_IMODE_EXECUTE); | |
4119532c BM |
388 | |
389 | ACPI_FREE(info); | |
4be44fcd | 390 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
391 | goto cleanup; |
392 | } | |
393 | ||
394 | /* | |
395 | * Delete the operands on the previous walkstate operand stack | |
396 | * (they were copied to new objects) | |
397 | */ | |
398 | for (i = 0; i < obj_desc->method.param_count; i++) { | |
4be44fcd LB |
399 | acpi_ut_remove_reference(this_walk_state->operands[i]); |
400 | this_walk_state->operands[i] = NULL; | |
1da177e4 LT |
401 | } |
402 | ||
403 | /* Clear the operand stack */ | |
404 | ||
405 | this_walk_state->num_operands = 0; | |
406 | ||
4be44fcd | 407 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
9bc75cff VP |
408 | "**** Begin nested execution of [%4.4s] **** WalkState=%p\n", |
409 | method_node->name.ascii, next_walk_state)); | |
1da177e4 | 410 | |
b229cf92 BM |
411 | /* Invoke an internal method if necessary */ |
412 | ||
1da177e4 | 413 | if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) { |
4be44fcd | 414 | status = obj_desc->method.implementation(next_walk_state); |
1da177e4 LT |
415 | } |
416 | ||
aff8c277 | 417 | return_ACPI_STATUS(status); |
a94f1881 LB |
418 | |
419 | cleanup: | |
a94f1881 | 420 | |
b229cf92 | 421 | /* On error, we must terminate the method properly */ |
aff8c277 | 422 | |
b229cf92 BM |
423 | acpi_ds_terminate_control_method(obj_desc, next_walk_state); |
424 | if (next_walk_state) { | |
425 | acpi_ds_delete_walk_state(next_walk_state); | |
426 | } | |
aff8c277 | 427 | |
4be44fcd | 428 | return_ACPI_STATUS(status); |
1da177e4 LT |
429 | } |
430 | ||
1da177e4 LT |
431 | /******************************************************************************* |
432 | * | |
433 | * FUNCTION: acpi_ds_restart_control_method | |
434 | * | |
435 | * PARAMETERS: walk_state - State for preempted method (caller) | |
436 | * return_desc - Return value from the called method | |
437 | * | |
438 | * RETURN: Status | |
439 | * | |
440 | * DESCRIPTION: Restart a method that was preempted by another (nested) method | |
441 | * invocation. Handle the return value (if any) from the callee. | |
442 | * | |
443 | ******************************************************************************/ | |
444 | ||
445 | acpi_status | |
4be44fcd LB |
446 | acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
447 | union acpi_operand_object *return_desc) | |
1da177e4 | 448 | { |
4be44fcd | 449 | acpi_status status; |
958dd242 | 450 | int same_as_implicit_return; |
1da177e4 | 451 | |
b229cf92 | 452 | ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state); |
1da177e4 | 453 | |
4be44fcd | 454 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
b229cf92 | 455 | "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n", |
f6dd9221 | 456 | acpi_ut_get_node_name(walk_state->method_node), |
4be44fcd | 457 | walk_state->method_call_op, return_desc)); |
1da177e4 | 458 | |
4be44fcd | 459 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
b229cf92 | 460 | " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n", |
4be44fcd LB |
461 | walk_state->return_used, |
462 | walk_state->results, walk_state)); | |
1da177e4 LT |
463 | |
464 | /* Did the called method return a value? */ | |
465 | ||
466 | if (return_desc) { | |
52fc0b02 | 467 | |
958dd242 BM |
468 | /* Is the implicit return object the same as the return desc? */ |
469 | ||
470 | same_as_implicit_return = | |
471 | (walk_state->implicit_return_obj == return_desc); | |
472 | ||
1da177e4 LT |
473 | /* Are we actually going to use the return value? */ |
474 | ||
475 | if (walk_state->return_used) { | |
52fc0b02 | 476 | |
1da177e4 LT |
477 | /* Save the return value from the previous method */ |
478 | ||
4be44fcd LB |
479 | status = acpi_ds_result_push(return_desc, walk_state); |
480 | if (ACPI_FAILURE(status)) { | |
481 | acpi_ut_remove_reference(return_desc); | |
482 | return_ACPI_STATUS(status); | |
1da177e4 LT |
483 | } |
484 | ||
485 | /* | |
486 | * Save as THIS method's return value in case it is returned | |
487 | * immediately to yet another method | |
488 | */ | |
489 | walk_state->return_desc = return_desc; | |
490 | } | |
491 | ||
492 | /* | |
958dd242 BM |
493 | * The following code is the optional support for the so-called |
494 | * "implicit return". Some AML code assumes that the last value of the | |
495 | * method is "implicitly" returned to the caller, in the absence of an | |
496 | * explicit return value. | |
497 | * | |
498 | * Just save the last result of the method as the return value. | |
499 | * | |
1da177e4 LT |
500 | * NOTE: this is optional because the ASL language does not actually |
501 | * support this behavior. | |
502 | */ | |
4be44fcd | 503 | else if (!acpi_ds_do_implicit_return |
958dd242 BM |
504 | (return_desc, walk_state, FALSE) |
505 | || same_as_implicit_return) { | |
1da177e4 LT |
506 | /* |
507 | * Delete the return value if it will not be used by the | |
958dd242 BM |
508 | * calling method or remove one reference if the explicit return |
509 | * is the same as the implicit return value. | |
1da177e4 | 510 | */ |
4be44fcd | 511 | acpi_ut_remove_reference(return_desc); |
1da177e4 LT |
512 | } |
513 | } | |
514 | ||
4be44fcd | 515 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
516 | } |
517 | ||
1da177e4 LT |
518 | /******************************************************************************* |
519 | * | |
520 | * FUNCTION: acpi_ds_terminate_control_method | |
521 | * | |
b229cf92 BM |
522 | * PARAMETERS: method_desc - Method object |
523 | * walk_state - State associated with the method | |
1da177e4 | 524 | * |
aff8c277 | 525 | * RETURN: None |
1da177e4 LT |
526 | * |
527 | * DESCRIPTION: Terminate a control method. Delete everything that the method | |
528 | * created, delete all locals and arguments, and delete the parse | |
529 | * tree if requested. | |
530 | * | |
967440e3 BM |
531 | * MUTEX: Interpreter is locked |
532 | * | |
1da177e4 LT |
533 | ******************************************************************************/ |
534 | ||
b229cf92 BM |
535 | void |
536 | acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, | |
537 | struct acpi_walk_state *walk_state) | |
1da177e4 | 538 | { |
1da177e4 | 539 | |
b229cf92 | 540 | ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state); |
1da177e4 | 541 | |
b229cf92 | 542 | /* method_desc is required, walk_state is optional */ |
1da177e4 | 543 | |
b229cf92 | 544 | if (!method_desc) { |
aff8c277 | 545 | return_VOID; |
1da177e4 LT |
546 | } |
547 | ||
b229cf92 | 548 | if (walk_state) { |
1da177e4 | 549 | |
b229cf92 BM |
550 | /* Delete all arguments and locals */ |
551 | ||
552 | acpi_ds_method_data_delete_all(walk_state); | |
1da177e4 | 553 | |
b7f9f042 BM |
554 | /* |
555 | * If method is serialized, release the mutex and restore the | |
556 | * current sync level for this thread | |
557 | */ | |
558 | if (method_desc->method.mutex) { | |
1da177e4 | 559 | |
b7f9f042 | 560 | /* Acquisition Depth handles recursive calls */ |
1da177e4 | 561 | |
b7f9f042 BM |
562 | method_desc->method.mutex->mutex.acquisition_depth--; |
563 | if (!method_desc->method.mutex->mutex.acquisition_depth) { | |
564 | walk_state->thread->current_sync_level = | |
565 | method_desc->method.mutex->mutex. | |
566 | original_sync_level; | |
b229cf92 | 567 | |
b7f9f042 BM |
568 | acpi_os_release_mutex(method_desc->method. |
569 | mutex->mutex.os_mutex); | |
b62151de | 570 | method_desc->method.mutex->mutex.thread_id = NULL; |
b7f9f042 | 571 | } |
1da177e4 | 572 | } |
1da177e4 | 573 | |
b229cf92 | 574 | /* |
f6dd9221 | 575 | * Delete any namespace objects created anywhere within |
b229cf92 BM |
576 | * the namespace by the execution of this method |
577 | */ | |
578 | acpi_ns_delete_namespace_by_owner(method_desc->method.owner_id); | |
28f55ebc BM |
579 | } |
580 | ||
b229cf92 BM |
581 | /* Decrement the thread count on the method */ |
582 | ||
583 | if (method_desc->method.thread_count) { | |
584 | method_desc->method.thread_count--; | |
585 | } else { | |
586 | ACPI_ERROR((AE_INFO, "Invalid zero thread count in method")); | |
587 | } | |
28f55ebc BM |
588 | |
589 | /* Are there any other threads currently executing this method? */ | |
590 | ||
b229cf92 | 591 | if (method_desc->method.thread_count) { |
28f55ebc BM |
592 | /* |
593 | * Additional threads. Do not release the owner_id in this case, | |
594 | * we immediately reuse it for the next thread executing this method | |
595 | */ | |
4be44fcd | 596 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
28f55ebc | 597 | "*** Completed execution of one thread, %d threads remaining\n", |
b229cf92 | 598 | method_desc->method.thread_count)); |
28f55ebc BM |
599 | } else { |
600 | /* This is the only executing thread for this method */ | |
1da177e4 | 601 | |
1da177e4 LT |
602 | /* |
603 | * Support to dynamically change a method from not_serialized to | |
28f55ebc | 604 | * Serialized if it appears that the method is incorrectly written and |
967440e3 BM |
605 | * does not support multiple thread execution. The best example of this |
606 | * is if such a method creates namespace objects and blocks. A second | |
1da177e4 LT |
607 | * thread will fail with an AE_ALREADY_EXISTS exception |
608 | * | |
609 | * This code is here because we must wait until the last thread exits | |
610 | * before creating the synchronization semaphore. | |
611 | */ | |
967440e3 BM |
612 | if ((method_desc->method.method_flags & AML_METHOD_SERIALIZED) |
613 | && (!method_desc->method.mutex)) { | |
b7f9f042 | 614 | (void)acpi_ds_create_method_mutex(method_desc); |
1da177e4 LT |
615 | } |
616 | ||
28f55ebc | 617 | /* No more threads, we can free the owner_id */ |
1da177e4 | 618 | |
b229cf92 | 619 | acpi_ut_release_owner_id(&method_desc->method.owner_id); |
1da177e4 | 620 | } |
a94f1881 | 621 | |
aff8c277 | 622 | return_VOID; |
1da177e4 | 623 | } |