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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: dsmethod - Parser/Interpreter interface - control method parsing | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
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 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acparser.h> | |
46 | #include <acpi/amlcode.h> | |
47 | #include <acpi/acdispat.h> | |
48 | #include <acpi/acinterp.h> | |
49 | #include <acpi/acnamesp.h> | |
defba1d8 | 50 | #include <acpi/acdisasm.h> |
1da177e4 | 51 | |
1da177e4 | 52 | #define _COMPONENT ACPI_DISPATCHER |
4be44fcd | 53 | ACPI_MODULE_NAME("dsmethod") |
1da177e4 | 54 | |
defba1d8 BM |
55 | /******************************************************************************* |
56 | * | |
57 | * FUNCTION: acpi_ds_method_error | |
58 | * | |
59 | * PARAMETERS: Status - Execution status | |
60 | * walk_state - Current state | |
61 | * | |
62 | * RETURN: Status | |
63 | * | |
64 | * DESCRIPTION: Called on method error. Invoke the global exception handler if | |
65 | * present, dump the method data if the disassembler is configured | |
66 | * | |
67 | * Note: Allows the exception handler to change the status code | |
68 | * | |
69 | ******************************************************************************/ | |
70 | acpi_status | |
71 | acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state) | |
72 | { | |
73 | ACPI_FUNCTION_ENTRY(); | |
74 | ||
75 | /* Ignore AE_OK and control exception codes */ | |
76 | ||
77 | if (ACPI_SUCCESS(status) || (status & AE_CODE_CONTROL)) { | |
78 | return (status); | |
79 | } | |
80 | ||
81 | /* Invoke the global exception handler */ | |
82 | ||
83 | if (acpi_gbl_exception_handler) { | |
84 | /* Exit the interpreter, allow handler to execute methods */ | |
85 | ||
86 | acpi_ex_exit_interpreter(); | |
87 | ||
88 | /* | |
89 | * Handler can map the exception code to anything it wants, including | |
90 | * AE_OK, in which case the executing method will not be aborted. | |
91 | */ | |
92 | status = acpi_gbl_exception_handler(status, | |
93 | walk_state->method_node ? | |
94 | walk_state->method_node-> | |
95 | name.integer : 0, | |
96 | walk_state->opcode, | |
97 | walk_state->aml_offset, | |
98 | NULL); | |
99 | (void)acpi_ex_enter_interpreter(); | |
100 | } | |
101 | #ifdef ACPI_DISASSEMBLER | |
102 | if (ACPI_FAILURE(status)) { | |
103 | /* Display method locals/args if disassembler is present */ | |
104 | ||
105 | acpi_dm_dump_method_info(status, walk_state, walk_state->op); | |
106 | } | |
107 | #endif | |
108 | ||
109 | return (status); | |
110 | } | |
111 | ||
1da177e4 LT |
112 | /******************************************************************************* |
113 | * | |
114 | * FUNCTION: acpi_ds_begin_method_execution | |
115 | * | |
116 | * PARAMETERS: method_node - Node of the method | |
117 | * obj_desc - The method object | |
118 | * calling_method_node - Caller of this method (if non-null) | |
119 | * | |
120 | * RETURN: Status | |
121 | * | |
122 | * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, | |
123 | * increments the thread count, and waits at the method semaphore | |
124 | * for clearance to execute. | |
125 | * | |
126 | ******************************************************************************/ | |
defba1d8 | 127 | |
1da177e4 | 128 | acpi_status |
defba1d8 BM |
129 | acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node, |
130 | union acpi_operand_object * obj_desc, | |
131 | struct acpi_namespace_node * calling_method_node) | |
1da177e4 | 132 | { |
4be44fcd | 133 | acpi_status status = AE_OK; |
1da177e4 | 134 | |
4be44fcd | 135 | ACPI_FUNCTION_TRACE_PTR("ds_begin_method_execution", method_node); |
1da177e4 LT |
136 | |
137 | if (!method_node) { | |
4be44fcd | 138 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
139 | } |
140 | ||
aff8c277 RM |
141 | /* Prevent wraparound of thread count */ |
142 | ||
143 | if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { | |
b8e4d893 BM |
144 | ACPI_ERROR((AE_INFO, |
145 | "Method reached maximum reentrancy limit (255)")); | |
aff8c277 RM |
146 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); |
147 | } | |
148 | ||
1da177e4 LT |
149 | /* |
150 | * If there is a concurrency limit on this method, we need to | |
151 | * obtain a unit from the method semaphore. | |
152 | */ | |
153 | if (obj_desc->method.semaphore) { | |
154 | /* | |
155 | * Allow recursive method calls, up to the reentrancy/concurrency | |
156 | * limit imposed by the SERIALIZED rule and the sync_level method | |
157 | * parameter. | |
158 | * | |
159 | * The point of this code is to avoid permanently blocking a | |
160 | * thread that is making recursive method calls. | |
161 | */ | |
162 | if (method_node == calling_method_node) { | |
4be44fcd LB |
163 | if (obj_desc->method.thread_count >= |
164 | obj_desc->method.concurrency) { | |
165 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); | |
1da177e4 LT |
166 | } |
167 | } | |
168 | ||
169 | /* | |
170 | * Get a unit from the method semaphore. This releases the | |
171 | * interpreter if we block | |
172 | */ | |
4be44fcd LB |
173 | status = |
174 | acpi_ex_system_wait_semaphore(obj_desc->method.semaphore, | |
175 | ACPI_WAIT_FOREVER); | |
1da177e4 LT |
176 | } |
177 | ||
aff8c277 RM |
178 | /* |
179 | * Allocate an Owner ID for this method, only if this is the first thread | |
180 | * to begin concurrent execution. We only need one owner_id, even if the | |
181 | * method is invoked recursively. | |
182 | */ | |
183 | if (!obj_desc->method.owner_id) { | |
184 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
185 | if (ACPI_FAILURE(status)) { | |
186 | return_ACPI_STATUS(status); | |
187 | } | |
188 | } | |
189 | ||
1da177e4 LT |
190 | /* |
191 | * Increment the method parse tree thread count since it has been | |
192 | * reentered one more time (even if it is the same thread) | |
193 | */ | |
194 | obj_desc->method.thread_count++; | |
4be44fcd | 195 | return_ACPI_STATUS(status); |
1da177e4 LT |
196 | } |
197 | ||
1da177e4 LT |
198 | /******************************************************************************* |
199 | * | |
200 | * FUNCTION: acpi_ds_call_control_method | |
201 | * | |
202 | * PARAMETERS: Thread - Info for this thread | |
203 | * this_walk_state - Current walk state | |
204 | * Op - Current Op to be walked | |
205 | * | |
206 | * RETURN: Status | |
207 | * | |
208 | * DESCRIPTION: Transfer execution to a called control method | |
209 | * | |
210 | ******************************************************************************/ | |
211 | ||
212 | acpi_status | |
4be44fcd LB |
213 | acpi_ds_call_control_method(struct acpi_thread_state *thread, |
214 | struct acpi_walk_state *this_walk_state, | |
215 | union acpi_parse_object *op) | |
1da177e4 | 216 | { |
4be44fcd LB |
217 | acpi_status status; |
218 | struct acpi_namespace_node *method_node; | |
219 | struct acpi_walk_state *next_walk_state = NULL; | |
220 | union acpi_operand_object *obj_desc; | |
221 | struct acpi_parameter_info info; | |
222 | u32 i; | |
1da177e4 | 223 | |
4be44fcd | 224 | ACPI_FUNCTION_TRACE_PTR("ds_call_control_method", this_walk_state); |
1da177e4 | 225 | |
4be44fcd LB |
226 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
227 | "Execute method %p, currentstate=%p\n", | |
228 | this_walk_state->prev_op, this_walk_state)); | |
1da177e4 LT |
229 | |
230 | /* | |
231 | * Get the namespace entry for the control method we are about to call | |
232 | */ | |
233 | method_node = this_walk_state->method_call_node; | |
234 | if (!method_node) { | |
4be44fcd | 235 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
236 | } |
237 | ||
4be44fcd | 238 | obj_desc = acpi_ns_get_attached_object(method_node); |
1da177e4 | 239 | if (!obj_desc) { |
4be44fcd | 240 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
241 | } |
242 | ||
1da177e4 LT |
243 | /* Init for new method, wait on concurrency semaphore */ |
244 | ||
4be44fcd LB |
245 | status = acpi_ds_begin_method_execution(method_node, obj_desc, |
246 | this_walk_state->method_node); | |
247 | if (ACPI_FAILURE(status)) { | |
f9f4601f | 248 | goto cleanup; |
1da177e4 LT |
249 | } |
250 | ||
251 | if (!(obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY)) { | |
252 | /* 1) Parse: Create a new walk state for the preempting walk */ | |
253 | ||
4be44fcd LB |
254 | next_walk_state = |
255 | acpi_ds_create_walk_state(obj_desc->method.owner_id, op, | |
256 | obj_desc, NULL); | |
1da177e4 | 257 | if (!next_walk_state) { |
4be44fcd | 258 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
259 | } |
260 | ||
261 | /* Create and init a Root Node */ | |
262 | ||
4be44fcd | 263 | op = acpi_ps_create_scope_op(); |
1da177e4 LT |
264 | if (!op) { |
265 | status = AE_NO_MEMORY; | |
266 | goto cleanup; | |
267 | } | |
268 | ||
4be44fcd LB |
269 | status = acpi_ds_init_aml_walk(next_walk_state, op, method_node, |
270 | obj_desc->method.aml_start, | |
271 | obj_desc->method.aml_length, | |
272 | NULL, 1); | |
273 | if (ACPI_FAILURE(status)) { | |
274 | acpi_ds_delete_walk_state(next_walk_state); | |
1da177e4 LT |
275 | goto cleanup; |
276 | } | |
277 | ||
278 | /* Begin AML parse */ | |
279 | ||
4be44fcd LB |
280 | status = acpi_ps_parse_aml(next_walk_state); |
281 | acpi_ps_delete_parse_tree(op); | |
1da177e4 LT |
282 | } |
283 | ||
284 | /* 2) Execute: Create a new state for the preempting walk */ | |
285 | ||
4be44fcd LB |
286 | next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id, |
287 | NULL, obj_desc, thread); | |
1da177e4 LT |
288 | if (!next_walk_state) { |
289 | status = AE_NO_MEMORY; | |
290 | goto cleanup; | |
291 | } | |
292 | /* | |
293 | * The resolved arguments were put on the previous walk state's operand | |
aff8c277 RM |
294 | * stack. Operands on the previous walk state stack always |
295 | * start at index 0. Also, null terminate the list of arguments | |
1da177e4 | 296 | */ |
4be44fcd | 297 | this_walk_state->operands[this_walk_state->num_operands] = NULL; |
1da177e4 LT |
298 | |
299 | info.parameters = &this_walk_state->operands[0]; | |
300 | info.parameter_type = ACPI_PARAM_ARGS; | |
301 | ||
4be44fcd LB |
302 | status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
303 | obj_desc->method.aml_start, | |
304 | obj_desc->method.aml_length, &info, 3); | |
305 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
306 | goto cleanup; |
307 | } | |
308 | ||
309 | /* | |
310 | * Delete the operands on the previous walkstate operand stack | |
311 | * (they were copied to new objects) | |
312 | */ | |
313 | for (i = 0; i < obj_desc->method.param_count; i++) { | |
4be44fcd LB |
314 | acpi_ut_remove_reference(this_walk_state->operands[i]); |
315 | this_walk_state->operands[i] = NULL; | |
1da177e4 LT |
316 | } |
317 | ||
318 | /* Clear the operand stack */ | |
319 | ||
320 | this_walk_state->num_operands = 0; | |
321 | ||
4be44fcd LB |
322 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
323 | "Starting nested execution, newstate=%p\n", | |
324 | next_walk_state)); | |
1da177e4 LT |
325 | |
326 | if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) { | |
4be44fcd | 327 | status = obj_desc->method.implementation(next_walk_state); |
1da177e4 LT |
328 | } |
329 | ||
aff8c277 | 330 | return_ACPI_STATUS(status); |
a94f1881 LB |
331 | |
332 | cleanup: | |
aff8c277 | 333 | /* Decrement the thread count on the method parse tree */ |
a94f1881 | 334 | |
aff8c277 | 335 | if (next_walk_state && (next_walk_state->method_desc)) { |
4be44fcd | 336 | next_walk_state->method_desc->method.thread_count--; |
1da177e4 | 337 | } |
aff8c277 RM |
338 | |
339 | /* On error, we must delete the new walk state */ | |
340 | ||
341 | acpi_ds_terminate_control_method(next_walk_state); | |
a94f1881 | 342 | acpi_ds_delete_walk_state(next_walk_state); |
4be44fcd | 343 | return_ACPI_STATUS(status); |
1da177e4 LT |
344 | } |
345 | ||
1da177e4 LT |
346 | /******************************************************************************* |
347 | * | |
348 | * FUNCTION: acpi_ds_restart_control_method | |
349 | * | |
350 | * PARAMETERS: walk_state - State for preempted method (caller) | |
351 | * return_desc - Return value from the called method | |
352 | * | |
353 | * RETURN: Status | |
354 | * | |
355 | * DESCRIPTION: Restart a method that was preempted by another (nested) method | |
356 | * invocation. Handle the return value (if any) from the callee. | |
357 | * | |
358 | ******************************************************************************/ | |
359 | ||
360 | acpi_status | |
4be44fcd LB |
361 | acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
362 | union acpi_operand_object *return_desc) | |
1da177e4 | 363 | { |
4be44fcd | 364 | acpi_status status; |
1da177e4 | 365 | |
4be44fcd | 366 | ACPI_FUNCTION_TRACE_PTR("ds_restart_control_method", walk_state); |
1da177e4 | 367 | |
4be44fcd LB |
368 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
369 | "****Restart [%4.4s] Op %p return_value_from_callee %p\n", | |
370 | (char *)&walk_state->method_node->name, | |
371 | walk_state->method_call_op, return_desc)); | |
1da177e4 | 372 | |
4be44fcd LB |
373 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
374 | " return_from_this_method_used?=%X res_stack %p Walk %p\n", | |
375 | walk_state->return_used, | |
376 | walk_state->results, walk_state)); | |
1da177e4 LT |
377 | |
378 | /* Did the called method return a value? */ | |
379 | ||
380 | if (return_desc) { | |
381 | /* Are we actually going to use the return value? */ | |
382 | ||
383 | if (walk_state->return_used) { | |
384 | /* Save the return value from the previous method */ | |
385 | ||
4be44fcd LB |
386 | status = acpi_ds_result_push(return_desc, walk_state); |
387 | if (ACPI_FAILURE(status)) { | |
388 | acpi_ut_remove_reference(return_desc); | |
389 | return_ACPI_STATUS(status); | |
1da177e4 LT |
390 | } |
391 | ||
392 | /* | |
393 | * Save as THIS method's return value in case it is returned | |
394 | * immediately to yet another method | |
395 | */ | |
396 | walk_state->return_desc = return_desc; | |
397 | } | |
398 | ||
399 | /* | |
400 | * The following code is the | |
401 | * optional support for a so-called "implicit return". Some AML code | |
402 | * assumes that the last value of the method is "implicitly" returned | |
403 | * to the caller. Just save the last result as the return value. | |
404 | * NOTE: this is optional because the ASL language does not actually | |
405 | * support this behavior. | |
406 | */ | |
4be44fcd LB |
407 | else if (!acpi_ds_do_implicit_return |
408 | (return_desc, walk_state, FALSE)) { | |
1da177e4 LT |
409 | /* |
410 | * Delete the return value if it will not be used by the | |
411 | * calling method | |
412 | */ | |
4be44fcd | 413 | acpi_ut_remove_reference(return_desc); |
1da177e4 LT |
414 | } |
415 | } | |
416 | ||
4be44fcd | 417 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
418 | } |
419 | ||
1da177e4 LT |
420 | /******************************************************************************* |
421 | * | |
422 | * FUNCTION: acpi_ds_terminate_control_method | |
423 | * | |
424 | * PARAMETERS: walk_state - State of the method | |
425 | * | |
aff8c277 | 426 | * RETURN: None |
1da177e4 LT |
427 | * |
428 | * DESCRIPTION: Terminate a control method. Delete everything that the method | |
429 | * created, delete all locals and arguments, and delete the parse | |
430 | * tree if requested. | |
431 | * | |
432 | ******************************************************************************/ | |
433 | ||
aff8c277 | 434 | void acpi_ds_terminate_control_method(struct acpi_walk_state *walk_state) |
1da177e4 | 435 | { |
4be44fcd LB |
436 | union acpi_operand_object *obj_desc; |
437 | struct acpi_namespace_node *method_node; | |
438 | acpi_status status; | |
1da177e4 | 439 | |
4be44fcd | 440 | ACPI_FUNCTION_TRACE_PTR("ds_terminate_control_method", walk_state); |
1da177e4 LT |
441 | |
442 | if (!walk_state) { | |
aff8c277 | 443 | return_VOID; |
1da177e4 LT |
444 | } |
445 | ||
446 | /* The current method object was saved in the walk state */ | |
447 | ||
448 | obj_desc = walk_state->method_desc; | |
449 | if (!obj_desc) { | |
aff8c277 | 450 | return_VOID; |
1da177e4 LT |
451 | } |
452 | ||
453 | /* Delete all arguments and locals */ | |
454 | ||
4be44fcd | 455 | acpi_ds_method_data_delete_all(walk_state); |
1da177e4 LT |
456 | |
457 | /* | |
458 | * Lock the parser while we terminate this method. | |
459 | * If this is the last thread executing the method, | |
460 | * we have additional cleanup to perform | |
461 | */ | |
4be44fcd LB |
462 | status = acpi_ut_acquire_mutex(ACPI_MTX_PARSER); |
463 | if (ACPI_FAILURE(status)) { | |
aff8c277 | 464 | return_VOID; |
1da177e4 LT |
465 | } |
466 | ||
467 | /* Signal completion of the execution of this method if necessary */ | |
468 | ||
469 | if (walk_state->method_desc->method.semaphore) { | |
4be44fcd LB |
470 | status = |
471 | acpi_os_signal_semaphore(walk_state->method_desc->method. | |
472 | semaphore, 1); | |
473 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
474 | ACPI_ERROR((AE_INFO, |
475 | "Could not signal method semaphore")); | |
1da177e4 LT |
476 | |
477 | /* Ignore error and continue cleanup */ | |
478 | } | |
479 | } | |
480 | ||
28f55ebc BM |
481 | /* |
482 | * There are no more threads executing this method. Perform | |
483 | * additional cleanup. | |
484 | * | |
485 | * The method Node is stored in the walk state | |
486 | */ | |
487 | method_node = walk_state->method_node; | |
488 | ||
489 | /* Lock namespace for possible update */ | |
490 | ||
491 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); | |
492 | if (ACPI_FAILURE(status)) { | |
493 | goto exit; | |
494 | } | |
495 | ||
496 | /* | |
497 | * Delete any namespace entries created immediately underneath | |
498 | * the method | |
499 | */ | |
500 | if (method_node->child) { | |
501 | acpi_ns_delete_namespace_subtree(method_node); | |
502 | } | |
503 | ||
504 | /* | |
505 | * Delete any namespace entries created anywhere else within | |
506 | * the namespace by the execution of this method | |
507 | */ | |
508 | acpi_ns_delete_namespace_by_owner(walk_state->method_desc->method. | |
509 | owner_id); | |
510 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
511 | ||
512 | /* Are there any other threads currently executing this method? */ | |
513 | ||
1da177e4 | 514 | if (walk_state->method_desc->method.thread_count) { |
28f55ebc BM |
515 | /* |
516 | * Additional threads. Do not release the owner_id in this case, | |
517 | * we immediately reuse it for the next thread executing this method | |
518 | */ | |
4be44fcd | 519 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
28f55ebc | 520 | "*** Completed execution of one thread, %d threads remaining\n", |
4be44fcd LB |
521 | walk_state->method_desc->method. |
522 | thread_count)); | |
28f55ebc BM |
523 | } else { |
524 | /* This is the only executing thread for this method */ | |
1da177e4 | 525 | |
1da177e4 LT |
526 | /* |
527 | * Support to dynamically change a method from not_serialized to | |
28f55ebc | 528 | * Serialized if it appears that the method is incorrectly written and |
1da177e4 LT |
529 | * does not support multiple thread execution. The best example of this |
530 | * is if such a method creates namespace objects and blocks. A second | |
531 | * thread will fail with an AE_ALREADY_EXISTS exception | |
532 | * | |
533 | * This code is here because we must wait until the last thread exits | |
534 | * before creating the synchronization semaphore. | |
535 | */ | |
536 | if ((walk_state->method_desc->method.concurrency == 1) && | |
4be44fcd LB |
537 | (!walk_state->method_desc->method.semaphore)) { |
538 | status = acpi_os_create_semaphore(1, 1, | |
539 | &walk_state-> | |
540 | method_desc->method. | |
541 | semaphore); | |
1da177e4 LT |
542 | } |
543 | ||
28f55ebc | 544 | /* No more threads, we can free the owner_id */ |
1da177e4 | 545 | |
4be44fcd LB |
546 | acpi_ut_release_owner_id(&walk_state->method_desc->method. |
547 | owner_id); | |
1da177e4 | 548 | } |
a94f1881 | 549 | |
aff8c277 RM |
550 | exit: |
551 | (void)acpi_ut_release_mutex(ACPI_MTX_PARSER); | |
552 | return_VOID; | |
1da177e4 | 553 | } |
28f55ebc BM |
554 | |
555 | #ifdef ACPI_INIT_PARSE_METHODS | |
556 | /* | |
557 | * Note 11/2005: Removed this code to parse all methods during table | |
558 | * load because it causes problems if there are any errors during the | |
559 | * parse. Also, it seems like overkill and we probably don't want to | |
560 | * abort a table load because of an issue with a single method. | |
561 | */ | |
562 | ||
563 | /******************************************************************************* | |
564 | * | |
565 | * FUNCTION: acpi_ds_parse_method | |
566 | * | |
567 | * PARAMETERS: Node - Method node | |
568 | * | |
569 | * RETURN: Status | |
570 | * | |
571 | * DESCRIPTION: Parse the AML that is associated with the method. | |
572 | * | |
573 | * MUTEX: Assumes parser is locked | |
574 | * | |
575 | ******************************************************************************/ | |
576 | ||
577 | acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node) | |
578 | { | |
579 | acpi_status status; | |
580 | union acpi_operand_object *obj_desc; | |
581 | union acpi_parse_object *op; | |
582 | struct acpi_walk_state *walk_state; | |
583 | ||
584 | ACPI_FUNCTION_TRACE_PTR("ds_parse_method", node); | |
585 | ||
586 | /* Parameter Validation */ | |
587 | ||
588 | if (!node) { | |
589 | return_ACPI_STATUS(AE_NULL_ENTRY); | |
590 | } | |
591 | ||
592 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
593 | "**** Parsing [%4.4s] **** named_obj=%p\n", | |
594 | acpi_ut_get_node_name(node), node)); | |
595 | ||
596 | /* Extract the method object from the method Node */ | |
597 | ||
598 | obj_desc = acpi_ns_get_attached_object(node); | |
599 | if (!obj_desc) { | |
600 | return_ACPI_STATUS(AE_NULL_OBJECT); | |
601 | } | |
602 | ||
603 | /* Create a mutex for the method if there is a concurrency limit */ | |
604 | ||
605 | if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) && | |
606 | (!obj_desc->method.semaphore)) { | |
607 | status = acpi_os_create_semaphore(obj_desc->method.concurrency, | |
608 | obj_desc->method.concurrency, | |
609 | &obj_desc->method.semaphore); | |
610 | if (ACPI_FAILURE(status)) { | |
611 | return_ACPI_STATUS(status); | |
612 | } | |
613 | } | |
614 | ||
615 | /* | |
616 | * Allocate a new parser op to be the root of the parsed | |
617 | * method tree | |
618 | */ | |
619 | op = acpi_ps_alloc_op(AML_METHOD_OP); | |
620 | if (!op) { | |
621 | return_ACPI_STATUS(AE_NO_MEMORY); | |
622 | } | |
623 | ||
624 | /* Init new op with the method name and pointer back to the Node */ | |
625 | ||
626 | acpi_ps_set_name(op, node->name.integer); | |
627 | op->common.node = node; | |
628 | ||
629 | /* | |
630 | * Get a new owner_id for objects created by this method. Namespace | |
631 | * objects (such as Operation Regions) can be created during the | |
632 | * first pass parse. | |
633 | */ | |
634 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
635 | if (ACPI_FAILURE(status)) { | |
636 | goto cleanup; | |
637 | } | |
638 | ||
639 | /* Create and initialize a new walk state */ | |
640 | ||
641 | walk_state = | |
642 | acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, NULL, | |
643 | NULL); | |
644 | if (!walk_state) { | |
645 | status = AE_NO_MEMORY; | |
646 | goto cleanup2; | |
647 | } | |
648 | ||
649 | status = acpi_ds_init_aml_walk(walk_state, op, node, | |
650 | obj_desc->method.aml_start, | |
651 | obj_desc->method.aml_length, NULL, 1); | |
652 | if (ACPI_FAILURE(status)) { | |
653 | acpi_ds_delete_walk_state(walk_state); | |
654 | goto cleanup2; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Parse the method, first pass | |
659 | * | |
660 | * The first pass load is where newly declared named objects are added into | |
661 | * the namespace. Actual evaluation of the named objects (what would be | |
662 | * called a "second pass") happens during the actual execution of the | |
663 | * method so that operands to the named objects can take on dynamic | |
664 | * run-time values. | |
665 | */ | |
666 | status = acpi_ps_parse_aml(walk_state); | |
667 | if (ACPI_FAILURE(status)) { | |
668 | goto cleanup2; | |
669 | } | |
670 | ||
671 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
672 | "**** [%4.4s] Parsed **** named_obj=%p Op=%p\n", | |
673 | acpi_ut_get_node_name(node), node, op)); | |
674 | ||
675 | /* | |
676 | * Delete the parse tree. We simply re-parse the method for every | |
677 | * execution since there isn't much overhead (compared to keeping lots | |
678 | * of parse trees around) | |
679 | */ | |
680 | acpi_ns_delete_namespace_subtree(node); | |
681 | acpi_ns_delete_namespace_by_owner(obj_desc->method.owner_id); | |
682 | ||
683 | cleanup2: | |
684 | acpi_ut_release_owner_id(&obj_desc->method.owner_id); | |
685 | ||
686 | cleanup: | |
687 | acpi_ps_delete_parse_tree(op); | |
688 | return_ACPI_STATUS(status); | |
689 | } | |
690 | #endif |