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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: dsmethod - Parser/Interpreter interface - control method parsing | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2005, R. Byron Moore | |
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> | |
50 | ||
1da177e4 | 51 | #define _COMPONENT ACPI_DISPATCHER |
4be44fcd | 52 | ACPI_MODULE_NAME("dsmethod") |
1da177e4 LT |
53 | |
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_ds_parse_method | |
57 | * | |
0c9938cc | 58 | * PARAMETERS: Node - Method node |
1da177e4 LT |
59 | * |
60 | * RETURN: Status | |
61 | * | |
0c9938cc | 62 | * DESCRIPTION: Parse the AML that is associated with the method. |
1da177e4 LT |
63 | * |
64 | * MUTEX: Assumes parser is locked | |
65 | * | |
66 | ******************************************************************************/ | |
4be44fcd | 67 | acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node) |
1da177e4 | 68 | { |
4be44fcd LB |
69 | acpi_status status; |
70 | union acpi_operand_object *obj_desc; | |
71 | union acpi_parse_object *op; | |
72 | struct acpi_walk_state *walk_state; | |
1da177e4 | 73 | |
4be44fcd | 74 | ACPI_FUNCTION_TRACE_PTR("ds_parse_method", node); |
1da177e4 LT |
75 | |
76 | /* Parameter Validation */ | |
77 | ||
0c9938cc | 78 | if (!node) { |
4be44fcd | 79 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
80 | } |
81 | ||
4be44fcd LB |
82 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
83 | "**** Parsing [%4.4s] **** named_obj=%p\n", | |
84 | acpi_ut_get_node_name(node), node)); | |
1da177e4 LT |
85 | |
86 | /* Extract the method object from the method Node */ | |
87 | ||
4be44fcd | 88 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 89 | if (!obj_desc) { |
4be44fcd | 90 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
91 | } |
92 | ||
93 | /* Create a mutex for the method if there is a concurrency limit */ | |
94 | ||
95 | if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) && | |
4be44fcd LB |
96 | (!obj_desc->method.semaphore)) { |
97 | status = acpi_os_create_semaphore(obj_desc->method.concurrency, | |
98 | obj_desc->method.concurrency, | |
99 | &obj_desc->method.semaphore); | |
100 | if (ACPI_FAILURE(status)) { | |
101 | return_ACPI_STATUS(status); | |
1da177e4 LT |
102 | } |
103 | } | |
104 | ||
105 | /* | |
106 | * Allocate a new parser op to be the root of the parsed | |
107 | * method tree | |
108 | */ | |
4be44fcd | 109 | op = acpi_ps_alloc_op(AML_METHOD_OP); |
1da177e4 | 110 | if (!op) { |
4be44fcd | 111 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
112 | } |
113 | ||
114 | /* Init new op with the method name and pointer back to the Node */ | |
115 | ||
4be44fcd | 116 | acpi_ps_set_name(op, node->name.integer); |
1da177e4 LT |
117 | op->common.node = node; |
118 | ||
119 | /* | |
120 | * Get a new owner_id for objects created by this method. Namespace | |
121 | * objects (such as Operation Regions) can be created during the | |
122 | * first pass parse. | |
123 | */ | |
4be44fcd LB |
124 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); |
125 | if (ACPI_FAILURE(status)) { | |
f9f4601f RM |
126 | goto cleanup; |
127 | } | |
1da177e4 LT |
128 | |
129 | /* Create and initialize a new walk state */ | |
130 | ||
4be44fcd LB |
131 | walk_state = |
132 | acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, NULL, | |
133 | NULL); | |
1da177e4 | 134 | if (!walk_state) { |
88ac00f5 | 135 | status = AE_NO_MEMORY; |
f9f4601f | 136 | goto cleanup2; |
1da177e4 LT |
137 | } |
138 | ||
4be44fcd LB |
139 | status = acpi_ds_init_aml_walk(walk_state, op, node, |
140 | obj_desc->method.aml_start, | |
141 | obj_desc->method.aml_length, NULL, 1); | |
142 | if (ACPI_FAILURE(status)) { | |
143 | acpi_ds_delete_walk_state(walk_state); | |
f9f4601f | 144 | goto cleanup2; |
1da177e4 LT |
145 | } |
146 | ||
147 | /* | |
148 | * Parse the method, first pass | |
149 | * | |
44f6c012 RM |
150 | * The first pass load is where newly declared named objects are added into |
151 | * the namespace. Actual evaluation of the named objects (what would be | |
152 | * called a "second pass") happens during the actual execution of the | |
153 | * method so that operands to the named objects can take on dynamic | |
154 | * run-time values. | |
1da177e4 | 155 | */ |
4be44fcd LB |
156 | status = acpi_ps_parse_aml(walk_state); |
157 | if (ACPI_FAILURE(status)) { | |
f9f4601f | 158 | goto cleanup2; |
1da177e4 LT |
159 | } |
160 | ||
4be44fcd LB |
161 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
162 | "**** [%4.4s] Parsed **** named_obj=%p Op=%p\n", | |
163 | acpi_ut_get_node_name(node), node, op)); | |
0c9938cc RM |
164 | |
165 | /* | |
166 | * Delete the parse tree. We simply re-parse the method for every | |
167 | * execution since there isn't much overhead (compared to keeping lots | |
168 | * of parse trees around) | |
169 | */ | |
4be44fcd LB |
170 | acpi_ns_delete_namespace_subtree(node); |
171 | acpi_ns_delete_namespace_by_owner(obj_desc->method.owner_id); | |
1da177e4 | 172 | |
4be44fcd LB |
173 | cleanup2: |
174 | acpi_ut_release_owner_id(&obj_desc->method.owner_id); | |
f9f4601f | 175 | |
4be44fcd LB |
176 | cleanup: |
177 | acpi_ps_delete_parse_tree(op); | |
178 | return_ACPI_STATUS(status); | |
1da177e4 LT |
179 | } |
180 | ||
1da177e4 LT |
181 | /******************************************************************************* |
182 | * | |
183 | * FUNCTION: acpi_ds_begin_method_execution | |
184 | * | |
185 | * PARAMETERS: method_node - Node of the method | |
186 | * obj_desc - The method object | |
187 | * calling_method_node - Caller of this method (if non-null) | |
188 | * | |
189 | * RETURN: Status | |
190 | * | |
191 | * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, | |
192 | * increments the thread count, and waits at the method semaphore | |
193 | * for clearance to execute. | |
194 | * | |
195 | ******************************************************************************/ | |
196 | ||
197 | acpi_status | |
4be44fcd LB |
198 | acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, |
199 | union acpi_operand_object *obj_desc, | |
200 | struct acpi_namespace_node *calling_method_node) | |
1da177e4 | 201 | { |
4be44fcd | 202 | acpi_status status = AE_OK; |
1da177e4 | 203 | |
4be44fcd | 204 | ACPI_FUNCTION_TRACE_PTR("ds_begin_method_execution", method_node); |
1da177e4 LT |
205 | |
206 | if (!method_node) { | |
4be44fcd | 207 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
208 | } |
209 | ||
aff8c277 RM |
210 | /* Prevent wraparound of thread count */ |
211 | ||
212 | if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { | |
213 | ACPI_REPORT_ERROR(("Method reached maximum reentrancy limit (255)\n")); | |
214 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * If there is a concurrency limit on this method, we need to | |
219 | * obtain a unit from the method semaphore. | |
220 | */ | |
221 | if (obj_desc->method.semaphore) { | |
222 | /* | |
223 | * Allow recursive method calls, up to the reentrancy/concurrency | |
224 | * limit imposed by the SERIALIZED rule and the sync_level method | |
225 | * parameter. | |
226 | * | |
227 | * The point of this code is to avoid permanently blocking a | |
228 | * thread that is making recursive method calls. | |
229 | */ | |
230 | if (method_node == calling_method_node) { | |
4be44fcd LB |
231 | if (obj_desc->method.thread_count >= |
232 | obj_desc->method.concurrency) { | |
233 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); | |
1da177e4 LT |
234 | } |
235 | } | |
236 | ||
237 | /* | |
238 | * Get a unit from the method semaphore. This releases the | |
239 | * interpreter if we block | |
240 | */ | |
4be44fcd LB |
241 | status = |
242 | acpi_ex_system_wait_semaphore(obj_desc->method.semaphore, | |
243 | ACPI_WAIT_FOREVER); | |
1da177e4 LT |
244 | } |
245 | ||
aff8c277 RM |
246 | /* |
247 | * Allocate an Owner ID for this method, only if this is the first thread | |
248 | * to begin concurrent execution. We only need one owner_id, even if the | |
249 | * method is invoked recursively. | |
250 | */ | |
251 | if (!obj_desc->method.owner_id) { | |
252 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
253 | if (ACPI_FAILURE(status)) { | |
254 | return_ACPI_STATUS(status); | |
255 | } | |
256 | } | |
257 | ||
1da177e4 LT |
258 | /* |
259 | * Increment the method parse tree thread count since it has been | |
260 | * reentered one more time (even if it is the same thread) | |
261 | */ | |
262 | obj_desc->method.thread_count++; | |
4be44fcd | 263 | return_ACPI_STATUS(status); |
1da177e4 LT |
264 | } |
265 | ||
1da177e4 LT |
266 | /******************************************************************************* |
267 | * | |
268 | * FUNCTION: acpi_ds_call_control_method | |
269 | * | |
270 | * PARAMETERS: Thread - Info for this thread | |
271 | * this_walk_state - Current walk state | |
272 | * Op - Current Op to be walked | |
273 | * | |
274 | * RETURN: Status | |
275 | * | |
276 | * DESCRIPTION: Transfer execution to a called control method | |
277 | * | |
278 | ******************************************************************************/ | |
279 | ||
280 | acpi_status | |
4be44fcd LB |
281 | acpi_ds_call_control_method(struct acpi_thread_state *thread, |
282 | struct acpi_walk_state *this_walk_state, | |
283 | union acpi_parse_object *op) | |
1da177e4 | 284 | { |
4be44fcd LB |
285 | acpi_status status; |
286 | struct acpi_namespace_node *method_node; | |
287 | struct acpi_walk_state *next_walk_state = NULL; | |
288 | union acpi_operand_object *obj_desc; | |
289 | struct acpi_parameter_info info; | |
290 | u32 i; | |
1da177e4 | 291 | |
4be44fcd | 292 | ACPI_FUNCTION_TRACE_PTR("ds_call_control_method", this_walk_state); |
1da177e4 | 293 | |
4be44fcd LB |
294 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
295 | "Execute method %p, currentstate=%p\n", | |
296 | this_walk_state->prev_op, this_walk_state)); | |
1da177e4 LT |
297 | |
298 | /* | |
299 | * Get the namespace entry for the control method we are about to call | |
300 | */ | |
301 | method_node = this_walk_state->method_call_node; | |
302 | if (!method_node) { | |
4be44fcd | 303 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
304 | } |
305 | ||
4be44fcd | 306 | obj_desc = acpi_ns_get_attached_object(method_node); |
1da177e4 | 307 | if (!obj_desc) { |
4be44fcd | 308 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
309 | } |
310 | ||
1da177e4 LT |
311 | /* Init for new method, wait on concurrency semaphore */ |
312 | ||
4be44fcd LB |
313 | status = acpi_ds_begin_method_execution(method_node, obj_desc, |
314 | this_walk_state->method_node); | |
315 | if (ACPI_FAILURE(status)) { | |
f9f4601f | 316 | goto cleanup; |
1da177e4 LT |
317 | } |
318 | ||
319 | if (!(obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY)) { | |
320 | /* 1) Parse: Create a new walk state for the preempting walk */ | |
321 | ||
4be44fcd LB |
322 | next_walk_state = |
323 | acpi_ds_create_walk_state(obj_desc->method.owner_id, op, | |
324 | obj_desc, NULL); | |
1da177e4 | 325 | if (!next_walk_state) { |
4be44fcd | 326 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
327 | } |
328 | ||
329 | /* Create and init a Root Node */ | |
330 | ||
4be44fcd | 331 | op = acpi_ps_create_scope_op(); |
1da177e4 LT |
332 | if (!op) { |
333 | status = AE_NO_MEMORY; | |
334 | goto cleanup; | |
335 | } | |
336 | ||
4be44fcd LB |
337 | status = acpi_ds_init_aml_walk(next_walk_state, op, method_node, |
338 | obj_desc->method.aml_start, | |
339 | obj_desc->method.aml_length, | |
340 | NULL, 1); | |
341 | if (ACPI_FAILURE(status)) { | |
342 | acpi_ds_delete_walk_state(next_walk_state); | |
1da177e4 LT |
343 | goto cleanup; |
344 | } | |
345 | ||
346 | /* Begin AML parse */ | |
347 | ||
4be44fcd LB |
348 | status = acpi_ps_parse_aml(next_walk_state); |
349 | acpi_ps_delete_parse_tree(op); | |
1da177e4 LT |
350 | } |
351 | ||
352 | /* 2) Execute: Create a new state for the preempting walk */ | |
353 | ||
4be44fcd LB |
354 | next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id, |
355 | NULL, obj_desc, thread); | |
1da177e4 LT |
356 | if (!next_walk_state) { |
357 | status = AE_NO_MEMORY; | |
358 | goto cleanup; | |
359 | } | |
360 | /* | |
361 | * The resolved arguments were put on the previous walk state's operand | |
aff8c277 RM |
362 | * stack. Operands on the previous walk state stack always |
363 | * start at index 0. Also, null terminate the list of arguments | |
1da177e4 | 364 | */ |
4be44fcd | 365 | this_walk_state->operands[this_walk_state->num_operands] = NULL; |
1da177e4 LT |
366 | |
367 | info.parameters = &this_walk_state->operands[0]; | |
368 | info.parameter_type = ACPI_PARAM_ARGS; | |
369 | ||
4be44fcd LB |
370 | status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
371 | obj_desc->method.aml_start, | |
372 | obj_desc->method.aml_length, &info, 3); | |
373 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
374 | goto cleanup; |
375 | } | |
376 | ||
377 | /* | |
378 | * Delete the operands on the previous walkstate operand stack | |
379 | * (they were copied to new objects) | |
380 | */ | |
381 | for (i = 0; i < obj_desc->method.param_count; i++) { | |
4be44fcd LB |
382 | acpi_ut_remove_reference(this_walk_state->operands[i]); |
383 | this_walk_state->operands[i] = NULL; | |
1da177e4 LT |
384 | } |
385 | ||
386 | /* Clear the operand stack */ | |
387 | ||
388 | this_walk_state->num_operands = 0; | |
389 | ||
4be44fcd LB |
390 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
391 | "Starting nested execution, newstate=%p\n", | |
392 | next_walk_state)); | |
1da177e4 LT |
393 | |
394 | if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) { | |
4be44fcd | 395 | status = obj_desc->method.implementation(next_walk_state); |
1da177e4 LT |
396 | } |
397 | ||
aff8c277 | 398 | return_ACPI_STATUS(status); |
a94f1881 LB |
399 | |
400 | cleanup: | |
aff8c277 | 401 | /* Decrement the thread count on the method parse tree */ |
a94f1881 | 402 | |
aff8c277 | 403 | if (next_walk_state && (next_walk_state->method_desc)) { |
4be44fcd | 404 | next_walk_state->method_desc->method.thread_count--; |
1da177e4 | 405 | } |
aff8c277 RM |
406 | |
407 | /* On error, we must delete the new walk state */ | |
408 | ||
409 | acpi_ds_terminate_control_method(next_walk_state); | |
a94f1881 | 410 | acpi_ds_delete_walk_state(next_walk_state); |
4be44fcd | 411 | return_ACPI_STATUS(status); |
1da177e4 LT |
412 | } |
413 | ||
1da177e4 LT |
414 | /******************************************************************************* |
415 | * | |
416 | * FUNCTION: acpi_ds_restart_control_method | |
417 | * | |
418 | * PARAMETERS: walk_state - State for preempted method (caller) | |
419 | * return_desc - Return value from the called method | |
420 | * | |
421 | * RETURN: Status | |
422 | * | |
423 | * DESCRIPTION: Restart a method that was preempted by another (nested) method | |
424 | * invocation. Handle the return value (if any) from the callee. | |
425 | * | |
426 | ******************************************************************************/ | |
427 | ||
428 | acpi_status | |
4be44fcd LB |
429 | acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
430 | union acpi_operand_object *return_desc) | |
1da177e4 | 431 | { |
4be44fcd | 432 | acpi_status status; |
1da177e4 | 433 | |
4be44fcd | 434 | ACPI_FUNCTION_TRACE_PTR("ds_restart_control_method", walk_state); |
1da177e4 | 435 | |
4be44fcd LB |
436 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
437 | "****Restart [%4.4s] Op %p return_value_from_callee %p\n", | |
438 | (char *)&walk_state->method_node->name, | |
439 | walk_state->method_call_op, return_desc)); | |
1da177e4 | 440 | |
4be44fcd LB |
441 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
442 | " return_from_this_method_used?=%X res_stack %p Walk %p\n", | |
443 | walk_state->return_used, | |
444 | walk_state->results, walk_state)); | |
1da177e4 LT |
445 | |
446 | /* Did the called method return a value? */ | |
447 | ||
448 | if (return_desc) { | |
449 | /* Are we actually going to use the return value? */ | |
450 | ||
451 | if (walk_state->return_used) { | |
452 | /* Save the return value from the previous method */ | |
453 | ||
4be44fcd LB |
454 | status = acpi_ds_result_push(return_desc, walk_state); |
455 | if (ACPI_FAILURE(status)) { | |
456 | acpi_ut_remove_reference(return_desc); | |
457 | return_ACPI_STATUS(status); | |
1da177e4 LT |
458 | } |
459 | ||
460 | /* | |
461 | * Save as THIS method's return value in case it is returned | |
462 | * immediately to yet another method | |
463 | */ | |
464 | walk_state->return_desc = return_desc; | |
465 | } | |
466 | ||
467 | /* | |
468 | * The following code is the | |
469 | * optional support for a so-called "implicit return". Some AML code | |
470 | * assumes that the last value of the method is "implicitly" returned | |
471 | * to the caller. Just save the last result as the return value. | |
472 | * NOTE: this is optional because the ASL language does not actually | |
473 | * support this behavior. | |
474 | */ | |
4be44fcd LB |
475 | else if (!acpi_ds_do_implicit_return |
476 | (return_desc, walk_state, FALSE)) { | |
1da177e4 LT |
477 | /* |
478 | * Delete the return value if it will not be used by the | |
479 | * calling method | |
480 | */ | |
4be44fcd | 481 | acpi_ut_remove_reference(return_desc); |
1da177e4 LT |
482 | } |
483 | } | |
484 | ||
4be44fcd | 485 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
486 | } |
487 | ||
1da177e4 LT |
488 | /******************************************************************************* |
489 | * | |
490 | * FUNCTION: acpi_ds_terminate_control_method | |
491 | * | |
492 | * PARAMETERS: walk_state - State of the method | |
493 | * | |
aff8c277 | 494 | * RETURN: None |
1da177e4 LT |
495 | * |
496 | * DESCRIPTION: Terminate a control method. Delete everything that the method | |
497 | * created, delete all locals and arguments, and delete the parse | |
498 | * tree if requested. | |
499 | * | |
500 | ******************************************************************************/ | |
501 | ||
aff8c277 | 502 | void acpi_ds_terminate_control_method(struct acpi_walk_state *walk_state) |
1da177e4 | 503 | { |
4be44fcd LB |
504 | union acpi_operand_object *obj_desc; |
505 | struct acpi_namespace_node *method_node; | |
506 | acpi_status status; | |
1da177e4 | 507 | |
4be44fcd | 508 | ACPI_FUNCTION_TRACE_PTR("ds_terminate_control_method", walk_state); |
1da177e4 LT |
509 | |
510 | if (!walk_state) { | |
aff8c277 | 511 | return_VOID; |
1da177e4 LT |
512 | } |
513 | ||
514 | /* The current method object was saved in the walk state */ | |
515 | ||
516 | obj_desc = walk_state->method_desc; | |
517 | if (!obj_desc) { | |
aff8c277 | 518 | return_VOID; |
1da177e4 LT |
519 | } |
520 | ||
521 | /* Delete all arguments and locals */ | |
522 | ||
4be44fcd | 523 | acpi_ds_method_data_delete_all(walk_state); |
1da177e4 LT |
524 | |
525 | /* | |
526 | * Lock the parser while we terminate this method. | |
527 | * If this is the last thread executing the method, | |
528 | * we have additional cleanup to perform | |
529 | */ | |
4be44fcd LB |
530 | status = acpi_ut_acquire_mutex(ACPI_MTX_PARSER); |
531 | if (ACPI_FAILURE(status)) { | |
aff8c277 | 532 | return_VOID; |
1da177e4 LT |
533 | } |
534 | ||
535 | /* Signal completion of the execution of this method if necessary */ | |
536 | ||
537 | if (walk_state->method_desc->method.semaphore) { | |
4be44fcd LB |
538 | status = |
539 | acpi_os_signal_semaphore(walk_state->method_desc->method. | |
540 | semaphore, 1); | |
541 | if (ACPI_FAILURE(status)) { | |
542 | ACPI_REPORT_ERROR(("Could not signal method semaphore\n")); | |
1da177e4 LT |
543 | |
544 | /* Ignore error and continue cleanup */ | |
545 | } | |
546 | } | |
547 | ||
548 | if (walk_state->method_desc->method.thread_count) { | |
4be44fcd LB |
549 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
550 | "*** Not deleting method namespace, there are still %d threads\n", | |
551 | walk_state->method_desc->method. | |
552 | thread_count)); | |
aff8c277 | 553 | } else { /* This is the last executing thread */ |
1da177e4 | 554 | |
1da177e4 LT |
555 | /* |
556 | * Support to dynamically change a method from not_serialized to | |
557 | * Serialized if it appears that the method is written foolishly and | |
558 | * does not support multiple thread execution. The best example of this | |
559 | * is if such a method creates namespace objects and blocks. A second | |
560 | * thread will fail with an AE_ALREADY_EXISTS exception | |
561 | * | |
562 | * This code is here because we must wait until the last thread exits | |
563 | * before creating the synchronization semaphore. | |
564 | */ | |
565 | if ((walk_state->method_desc->method.concurrency == 1) && | |
4be44fcd LB |
566 | (!walk_state->method_desc->method.semaphore)) { |
567 | status = acpi_os_create_semaphore(1, 1, | |
568 | &walk_state-> | |
569 | method_desc->method. | |
570 | semaphore); | |
1da177e4 LT |
571 | } |
572 | ||
573 | /* | |
574 | * There are no more threads executing this method. Perform | |
575 | * additional cleanup. | |
576 | * | |
577 | * The method Node is stored in the walk state | |
578 | */ | |
579 | method_node = walk_state->method_node; | |
580 | ||
581 | /* | |
582 | * Delete any namespace entries created immediately underneath | |
583 | * the method | |
584 | */ | |
4be44fcd LB |
585 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
586 | if (ACPI_FAILURE(status)) { | |
aff8c277 | 587 | goto exit; |
1da177e4 LT |
588 | } |
589 | ||
590 | if (method_node->child) { | |
4be44fcd | 591 | acpi_ns_delete_namespace_subtree(method_node); |
1da177e4 LT |
592 | } |
593 | ||
594 | /* | |
595 | * Delete any namespace entries created anywhere else within | |
596 | * the namespace | |
597 | */ | |
4be44fcd LB |
598 | acpi_ns_delete_namespace_by_owner(walk_state->method_desc-> |
599 | method.owner_id); | |
600 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
601 | acpi_ut_release_owner_id(&walk_state->method_desc->method. | |
602 | owner_id); | |
1da177e4 | 603 | } |
a94f1881 | 604 | |
aff8c277 RM |
605 | exit: |
606 | (void)acpi_ut_release_mutex(ACPI_MTX_PARSER); | |
607 | return_VOID; | |
1da177e4 | 608 | } |