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/drivers/acpi/acpica/psxface.c

https://bitbucket.org/ndreys/linux-sunxi
C | 392 lines | 172 code | 75 blank | 145 comment | 26 complexity | 516846532e6a8fb01023354dfa8435e0 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/******************************************************************************
  2 *
  3 * Module Name: psxface - Parser external interfaces
  4 *
  5 *****************************************************************************/
  6
  7/*
  8 * Copyright (C) 2000 - 2011, Intel Corp.
  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
 44#include <acpi/acpi.h>
 45#include "accommon.h"
 46#include "acparser.h"
 47#include "acdispat.h"
 48#include "acinterp.h"
 49#include "actables.h"
 50
 51#define _COMPONENT          ACPI_PARSER
 52ACPI_MODULE_NAME("psxface")
 53
 54/* Local Prototypes */
 55static void acpi_ps_start_trace(struct acpi_evaluate_info *info);
 56
 57static void acpi_ps_stop_trace(struct acpi_evaluate_info *info);
 58
 59static void
 60acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action);
 61
 62/*******************************************************************************
 63 *
 64 * FUNCTION:    acpi_debug_trace
 65 *
 66 * PARAMETERS:  method_name     - Valid ACPI name string
 67 *              debug_level     - Optional level mask. 0 to use default
 68 *              debug_layer     - Optional layer mask. 0 to use default
 69 *              Flags           - bit 1: one shot(1) or persistent(0)
 70 *
 71 * RETURN:      Status
 72 *
 73 * DESCRIPTION: External interface to enable debug tracing during control
 74 *              method execution
 75 *
 76 ******************************************************************************/
 77
 78acpi_status
 79acpi_debug_trace(char *name, u32 debug_level, u32 debug_layer, u32 flags)
 80{
 81	acpi_status status;
 82
 83	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 84	if (ACPI_FAILURE(status)) {
 85		return (status);
 86	}
 87
 88	/* TBDs: Validate name, allow full path or just nameseg */
 89
 90	acpi_gbl_trace_method_name = *ACPI_CAST_PTR(u32, name);
 91	acpi_gbl_trace_flags = flags;
 92
 93	if (debug_level) {
 94		acpi_gbl_trace_dbg_level = debug_level;
 95	}
 96	if (debug_layer) {
 97		acpi_gbl_trace_dbg_layer = debug_layer;
 98	}
 99
100	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
101	return (AE_OK);
102}
103
104/*******************************************************************************
105 *
106 * FUNCTION:    acpi_ps_start_trace
107 *
108 * PARAMETERS:  Info        - Method info struct
109 *
110 * RETURN:      None
111 *
112 * DESCRIPTION: Start control method execution trace
113 *
114 ******************************************************************************/
115
116static void acpi_ps_start_trace(struct acpi_evaluate_info *info)
117{
118	acpi_status status;
119
120	ACPI_FUNCTION_ENTRY();
121
122	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
123	if (ACPI_FAILURE(status)) {
124		return;
125	}
126
127	if ((!acpi_gbl_trace_method_name) ||
128	    (acpi_gbl_trace_method_name != info->resolved_node->name.integer)) {
129		goto exit;
130	}
131
132	acpi_gbl_original_dbg_level = acpi_dbg_level;
133	acpi_gbl_original_dbg_layer = acpi_dbg_layer;
134
135	acpi_dbg_level = 0x00FFFFFF;
136	acpi_dbg_layer = ACPI_UINT32_MAX;
137
138	if (acpi_gbl_trace_dbg_level) {
139		acpi_dbg_level = acpi_gbl_trace_dbg_level;
140	}
141	if (acpi_gbl_trace_dbg_layer) {
142		acpi_dbg_layer = acpi_gbl_trace_dbg_layer;
143	}
144
145      exit:
146	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
147}
148
149/*******************************************************************************
150 *
151 * FUNCTION:    acpi_ps_stop_trace
152 *
153 * PARAMETERS:  Info        - Method info struct
154 *
155 * RETURN:      None
156 *
157 * DESCRIPTION: Stop control method execution trace
158 *
159 ******************************************************************************/
160
161static void acpi_ps_stop_trace(struct acpi_evaluate_info *info)
162{
163	acpi_status status;
164
165	ACPI_FUNCTION_ENTRY();
166
167	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
168	if (ACPI_FAILURE(status)) {
169		return;
170	}
171
172	if ((!acpi_gbl_trace_method_name) ||
173	    (acpi_gbl_trace_method_name != info->resolved_node->name.integer)) {
174		goto exit;
175	}
176
177	/* Disable further tracing if type is one-shot */
178
179	if (acpi_gbl_trace_flags & 1) {
180		acpi_gbl_trace_method_name = 0;
181		acpi_gbl_trace_dbg_level = 0;
182		acpi_gbl_trace_dbg_layer = 0;
183	}
184
185	acpi_dbg_level = acpi_gbl_original_dbg_level;
186	acpi_dbg_layer = acpi_gbl_original_dbg_layer;
187
188      exit:
189	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
190}
191
192/*******************************************************************************
193 *
194 * FUNCTION:    acpi_ps_execute_method
195 *
196 * PARAMETERS:  Info            - Method info block, contains:
197 *                  Node            - Method Node to execute
198 *                  obj_desc        - Method object
199 *                  Parameters      - List of parameters to pass to the method,
200 *                                    terminated by NULL. Params itself may be
201 *                                    NULL if no parameters are being passed.
202 *                  return_object   - Where to put method's return value (if
203 *                                    any). If NULL, no value is returned.
204 *                  parameter_type  - Type of Parameter list
205 *                  return_object   - Where to put method's return value (if
206 *                                    any). If NULL, no value is returned.
207 *                  pass_number     - Parse or execute pass
208 *
209 * RETURN:      Status
210 *
211 * DESCRIPTION: Execute a control method
212 *
213 ******************************************************************************/
214
215acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
216{
217	acpi_status status;
218	union acpi_parse_object *op;
219	struct acpi_walk_state *walk_state;
220
221	ACPI_FUNCTION_TRACE(ps_execute_method);
222
223	/* Quick validation of DSDT header */
224
225	acpi_tb_check_dsdt_header();
226
227	/* Validate the Info and method Node */
228
229	if (!info || !info->resolved_node) {
230		return_ACPI_STATUS(AE_NULL_ENTRY);
231	}
232
233	/* Init for new method, wait on concurrency semaphore */
234
235	status =
236	    acpi_ds_begin_method_execution(info->resolved_node, info->obj_desc,
237					   NULL);
238	if (ACPI_FAILURE(status)) {
239		return_ACPI_STATUS(status);
240	}
241
242	/*
243	 * The caller "owns" the parameters, so give each one an extra reference
244	 */
245	acpi_ps_update_parameter_list(info, REF_INCREMENT);
246
247	/* Begin tracing if requested */
248
249	acpi_ps_start_trace(info);
250
251	/*
252	 * Execute the method. Performs parse simultaneously
253	 */
254	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
255			  "**** Begin Method Parse/Execute [%4.4s] **** Node=%p Obj=%p\n",
256			  info->resolved_node->name.ascii, info->resolved_node,
257			  info->obj_desc));
258
259	/* Create and init a Root Node */
260
261	op = acpi_ps_create_scope_op();
262	if (!op) {
263		status = AE_NO_MEMORY;
264		goto cleanup;
265	}
266
267	/* Create and initialize a new walk state */
268
269	info->pass_number = ACPI_IMODE_EXECUTE;
270	walk_state =
271	    acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
272				      NULL, NULL);
273	if (!walk_state) {
274		status = AE_NO_MEMORY;
275		goto cleanup;
276	}
277
278	status = acpi_ds_init_aml_walk(walk_state, op, info->resolved_node,
279				       info->obj_desc->method.aml_start,
280				       info->obj_desc->method.aml_length, info,
281				       info->pass_number);
282	if (ACPI_FAILURE(status)) {
283		acpi_ds_delete_walk_state(walk_state);
284		goto cleanup;
285	}
286
287	if (info->obj_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) {
288		walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
289	}
290
291	/* Invoke an internal method if necessary */
292
293	if (info->obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) {
294		status =
295		    info->obj_desc->method.dispatch.implementation(walk_state);
296		info->return_object = walk_state->return_desc;
297
298		/* Cleanup states */
299
300		acpi_ds_scope_stack_clear(walk_state);
301		acpi_ps_cleanup_scope(&walk_state->parser_state);
302		acpi_ds_terminate_control_method(walk_state->method_desc,
303						 walk_state);
304		acpi_ds_delete_walk_state(walk_state);
305		goto cleanup;
306	}
307
308	/*
309	 * Start method evaluation with an implicit return of zero.
310	 * This is done for Windows compatibility.
311	 */
312	if (acpi_gbl_enable_interpreter_slack) {
313		walk_state->implicit_return_obj =
314		    acpi_ut_create_integer_object((u64) 0);
315		if (!walk_state->implicit_return_obj) {
316			status = AE_NO_MEMORY;
317			acpi_ds_delete_walk_state(walk_state);
318			goto cleanup;
319		}
320	}
321
322	/* Parse the AML */
323
324	status = acpi_ps_parse_aml(walk_state);
325
326	/* walk_state was deleted by parse_aml */
327
328      cleanup:
329	acpi_ps_delete_parse_tree(op);
330
331	/* End optional tracing */
332
333	acpi_ps_stop_trace(info);
334
335	/* Take away the extra reference that we gave the parameters above */
336
337	acpi_ps_update_parameter_list(info, REF_DECREMENT);
338
339	/* Exit now if error above */
340
341	if (ACPI_FAILURE(status)) {
342		return_ACPI_STATUS(status);
343	}
344
345	/*
346	 * If the method has returned an object, signal this to the caller with
347	 * a control exception code
348	 */
349	if (info->return_object) {
350		ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Method returned ObjDesc=%p\n",
351				  info->return_object));
352		ACPI_DUMP_STACK_ENTRY(info->return_object);
353
354		status = AE_CTRL_RETURN_VALUE;
355	}
356
357	return_ACPI_STATUS(status);
358}
359
360/*******************************************************************************
361 *
362 * FUNCTION:    acpi_ps_update_parameter_list
363 *
364 * PARAMETERS:  Info            - See struct acpi_evaluate_info
365 *                                (Used: parameter_type and Parameters)
366 *              Action          - Add or Remove reference
367 *
368 * RETURN:      Status
369 *
370 * DESCRIPTION: Update reference count on all method parameter objects
371 *
372 ******************************************************************************/
373
374static void
375acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action)
376{
377	u32 i;
378
379	if (info->parameters) {
380
381		/* Update reference count for each parameter */
382
383		for (i = 0; info->parameters[i]; i++) {
384
385			/* Ignore errors, just do them all */
386
387			(void)acpi_ut_update_object_reference(info->
388							      parameters[i],
389							      action);
390		}
391	}
392}