release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/psxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psxface - Parser external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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 #include "amlcode.h"
  51
  52 #define _COMPONENT          ACPI_PARSER
  53 ACPI_MODULE_NAME("psxface")
  54
  55 /* Local Prototypes */
  56 static void acpi_ps_start_trace(struct acpi_evaluate_info *info);
  57
  58 static void acpi_ps_stop_trace(struct acpi_evaluate_info *info);
  59
  60 static void
  61 acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action);
  62
  63 /*******************************************************************************
  64  *
  65  * FUNCTION:    acpi_debug_trace
  66  *
  67  * PARAMETERS:  method_name     - Valid ACPI name string
  68  *              debug_level     - Optional level mask. 0 to use default
  69  *              debug_layer     - Optional layer mask. 0 to use default
  70  *              Flags           - bit 1: one shot(1) or persistent(0)
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: External interface to enable debug tracing during control
  75  *              method execution
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_debug_trace(char *name, u32 debug_level, u32 debug_layer, u32 flags)
  81 {
  82         acpi_status status;
  83
  84         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  85         if (ACPI_FAILURE(status)) {
  86                 return (status);
  87         }
  88
  89         /* TBDs: Validate name, allow full path or just nameseg */
  90
  91         acpi_gbl_trace_method_name = *ACPI_CAST_PTR(u32, name);
  92         acpi_gbl_trace_flags = flags;
  93
  94         if (debug_level) {
  95                 acpi_gbl_trace_dbg_level = debug_level;
  96         }
  97         if (debug_layer) {
  98                 acpi_gbl_trace_dbg_layer = debug_layer;
  99         }
 100
 101         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 102         return (AE_OK);
 103 }
 104
 105 /*******************************************************************************
 106  *
 107  * FUNCTION:    acpi_ps_start_trace
 108  *
 109  * PARAMETERS:  Info        - Method info struct
 110  *
 111  * RETURN:      None
 112  *
 113  * DESCRIPTION: Start control method execution trace
 114  *
 115  ******************************************************************************/
 116
 117 static void acpi_ps_start_trace(struct acpi_evaluate_info *info)
 118 {
 119         acpi_status status;
 120
 121         ACPI_FUNCTION_ENTRY();
 122
 123         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 124         if (ACPI_FAILURE(status)) {
 125                 return;
 126         }
 127
 128         if ((!acpi_gbl_trace_method_name) ||
 129             (acpi_gbl_trace_method_name != info->resolved_node->name.integer)) {
 130                 goto exit;
 131         }
 132
 133         acpi_gbl_original_dbg_level = acpi_dbg_level;
 134         acpi_gbl_original_dbg_layer = acpi_dbg_layer;
 135
 136         acpi_dbg_level = 0x00FFFFFF;
 137         acpi_dbg_layer = ACPI_UINT32_MAX;
 138
 139         if (acpi_gbl_trace_dbg_level) {
 140                 acpi_dbg_level = acpi_gbl_trace_dbg_level;
 141         }
 142         if (acpi_gbl_trace_dbg_layer) {
 143                 acpi_dbg_layer = acpi_gbl_trace_dbg_layer;
 144         }
 145
 146       exit:
 147         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 148 }
 149
 150 /*******************************************************************************
 151  *
 152  * FUNCTION:    acpi_ps_stop_trace
 153  *
 154  * PARAMETERS:  Info        - Method info struct
 155  *
 156  * RETURN:      None
 157  *
 158  * DESCRIPTION: Stop control method execution trace
 159  *
 160  ******************************************************************************/
 161
 162 static void acpi_ps_stop_trace(struct acpi_evaluate_info *info)
 163 {
 164         acpi_status status;
 165
 166         ACPI_FUNCTION_ENTRY();
 167
 168         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 169         if (ACPI_FAILURE(status)) {
 170                 return;
 171         }
 172
 173         if ((!acpi_gbl_trace_method_name) ||
 174             (acpi_gbl_trace_method_name != info->resolved_node->name.integer)) {
 175                 goto exit;
 176         }
 177
 178         /* Disable further tracing if type is one-shot */
 179
 180         if (acpi_gbl_trace_flags & 1) {
 181                 acpi_gbl_trace_method_name = 0;
 182                 acpi_gbl_trace_dbg_level = 0;
 183                 acpi_gbl_trace_dbg_layer = 0;
 184         }
 185
 186         acpi_dbg_level = acpi_gbl_original_dbg_level;
 187         acpi_dbg_layer = acpi_gbl_original_dbg_layer;
 188
 189       exit:
 190         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 191 }
 192
 193 /*******************************************************************************
 194  *
 195  * FUNCTION:    acpi_ps_execute_method
 196  *
 197  * PARAMETERS:  Info            - Method info block, contains:
 198  *                  Node            - Method Node to execute
 199  *                  obj_desc        - Method object
 200  *                  Parameters      - List of parameters to pass to the method,
 201  *                                    terminated by NULL. Params itself may be
 202  *                                    NULL if no parameters are being passed.
 203  *                  return_object   - Where to put method's return value (if
 204  *                                    any). If NULL, no value is returned.
 205  *                  parameter_type  - Type of Parameter list
 206  *                  return_object   - Where to put method's return value (if
 207  *                                    any). If NULL, no value is returned.
 208  *                  pass_number     - Parse or execute pass
 209  *
 210  * RETURN:      Status
 211  *
 212  * DESCRIPTION: Execute a control method
 213  *
 214  ******************************************************************************/
 215
 216 acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
 217 {
 218         acpi_status status;
 219         union acpi_parse_object *op;
 220         struct acpi_walk_state *walk_state;
 221
 222         ACPI_FUNCTION_TRACE(ps_execute_method);
 223
 224         /* Quick validation of DSDT header */
 225
 226         acpi_tb_check_dsdt_header();
 227
 228         /* Validate the Info and method Node */
 229
 230         if (!info || !info->resolved_node) {
 231                 return_ACPI_STATUS(AE_NULL_ENTRY);
 232         }
 233
 234         /* Init for new method, wait on concurrency semaphore */
 235
 236         status =
 237             acpi_ds_begin_method_execution(info->resolved_node, info->obj_desc,
 238                                            NULL);
 239         if (ACPI_FAILURE(status)) {
 240                 return_ACPI_STATUS(status);
 241         }
 242
 243         /*
 244          * The caller "owns" the parameters, so give each one an extra reference
 245          */
 246         acpi_ps_update_parameter_list(info, REF_INCREMENT);
 247
 248         /* Begin tracing if requested */
 249
 250         acpi_ps_start_trace(info);
 251
 252         /*
 253          * Execute the method. Performs parse simultaneously
 254          */
 255         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 256                           "**** Begin Method Parse/Execute [%4.4s] **** Node=%p Obj=%p\n",
 257                           info->resolved_node->name.ascii, info->resolved_node,
 258                           info->obj_desc));
 259
 260         /* Create and init a Root Node */
 261
 262         op = acpi_ps_create_scope_op();
 263         if (!op) {
 264                 status = AE_NO_MEMORY;
 265                 goto cleanup;
 266         }
 267
 268         /* Create and initialize a new walk state */
 269
 270         info->pass_number = ACPI_IMODE_EXECUTE;
 271         walk_state =
 272             acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
 273                                       NULL, NULL);
 274         if (!walk_state) {
 275                 status = AE_NO_MEMORY;
 276                 goto cleanup;
 277         }
 278
 279         status = acpi_ds_init_aml_walk(walk_state, op, info->resolved_node,
 280                                        info->obj_desc->method.aml_start,
 281                                        info->obj_desc->method.aml_length, info,
 282                                        info->pass_number);
 283         if (ACPI_FAILURE(status)) {
 284                 acpi_ds_delete_walk_state(walk_state);
 285                 goto cleanup;
 286         }
 287
 288         if (info->obj_desc->method.flags & AOPOBJ_MODULE_LEVEL) {
 289                 walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
 290         }
 291
 292         /* Invoke an internal method if necessary */
 293
 294         if (info->obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
 295                 status =
 296                     info->obj_desc->method.extra.implementation(walk_state);
 297                 info->return_object = walk_state->return_desc;
 298
 299                 /* Cleanup states */
 300
 301                 acpi_ds_scope_stack_clear(walk_state);
 302                 acpi_ps_cleanup_scope(&walk_state->parser_state);
 303                 acpi_ds_terminate_control_method(walk_state->method_desc,
 304                                                  walk_state);
 305                 acpi_ds_delete_walk_state(walk_state);
 306                 goto cleanup;
 307         }
 308
 309         /*
 310          * Start method evaluation with an implicit return of zero.
 311          * This is done for Windows compatibility.
 312          */
 313         if (acpi_gbl_enable_interpreter_slack) {
 314                 walk_state->implicit_return_obj =
 315                     acpi_ut_create_integer_object((u64) 0);
 316                 if (!walk_state->implicit_return_obj) {
 317                         status = AE_NO_MEMORY;
 318                         acpi_ds_delete_walk_state(walk_state);
 319                         goto cleanup;
 320                 }
 321         }
 322
 323         /* Parse the AML */
 324
 325         status = acpi_ps_parse_aml(walk_state);
 326
 327         /* walk_state was deleted by parse_aml */
 328
 329       cleanup:
 330         acpi_ps_delete_parse_tree(op);
 331
 332         /* End optional tracing */
 333
 334         acpi_ps_stop_trace(info);
 335
 336         /* Take away the extra reference that we gave the parameters above */
 337
 338         acpi_ps_update_parameter_list(info, REF_DECREMENT);
 339
 340         /* Exit now if error above */
 341
 342         if (ACPI_FAILURE(status)) {
 343                 return_ACPI_STATUS(status);
 344         }
 345
 346         /*
 347          * If the method has returned an object, signal this to the caller with
 348          * a control exception code
 349          */
 350         if (info->return_object) {
 351                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Method returned ObjDesc=%p\n",
 352                                   info->return_object));
 353                 ACPI_DUMP_STACK_ENTRY(info->return_object);
 354
 355                 status = AE_CTRL_RETURN_VALUE;
 356         }
 357
 358         return_ACPI_STATUS(status);
 359 }
 360
 361 /*******************************************************************************
 362  *
 363  * FUNCTION:    acpi_ps_update_parameter_list
 364  *
 365  * PARAMETERS:  Info            - See struct acpi_evaluate_info
 366  *                                (Used: parameter_type and Parameters)
 367  *              Action          - Add or Remove reference
 368  *
 369  * RETURN:      Status
 370  *
 371  * DESCRIPTION: Update reference count on all method parameter objects
 372  *
 373  ******************************************************************************/
 374
 375 static void
 376 acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action)
 377 {
 378         u32 i;
 379
 380         if (info->parameters) {
 381
 382                 /* Update reference count for each parameter */
 383
 384                 for (i = 0; info->parameters[i]; i++) {
 385
 386                         /* Ignore errors, just do them all */
 387
 388                         (void)acpi_ut_update_object_reference(info->
 389                                                               parameters[i],
 390                                                               action);
 391                 }
 392         }
 393 }