drivers/acpi/acpica/psxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psxface - Parser external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 "acnamesp.h"
  51
  52 #define _COMPONENT          ACPI_PARSER
  53 ACPI_MODULE_NAME("psxface")
  54
  55 /* Local Prototypes */
  56 static void
  57 acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action);
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_debug_trace
  62  *
  63  * PARAMETERS:  method_name     - Valid ACPI name string
  64  *              debug_level     - Optional level mask. 0 to use default
  65  *              debug_layer     - Optional layer mask. 0 to use default
  66  *              flags           - bit 1: one shot(1) or persistent(0)
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: External interface to enable debug tracing during control
  71  *              method execution
  72  *
  73  ******************************************************************************/
  74
  75 acpi_status
  76 acpi_debug_trace(const char *name, u32 debug_level, u32 debug_layer, u32 flags)
  77 {
  78         acpi_status status;
  79
  80         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  81         if (ACPI_FAILURE(status)) {
  82                 return (status);
  83         }
  84
  85         acpi_gbl_trace_method_name = name;
  86         acpi_gbl_trace_flags = flags;
  87         acpi_gbl_trace_dbg_level = debug_level;
  88         acpi_gbl_trace_dbg_layer = debug_layer;
  89         status = AE_OK;
  90
  91         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
  92         return (status);
  93 }
  94
  95 /*******************************************************************************
  96  *
  97  * FUNCTION:    acpi_ps_execute_method
  98  *
  99  * PARAMETERS:  info            - Method info block, contains:
 100  *                  node            - Method Node to execute
 101  *                  obj_desc        - Method object
 102  *                  parameters      - List of parameters to pass to the method,
 103  *                                    terminated by NULL. Params itself may be
 104  *                                    NULL if no parameters are being passed.
 105  *                  return_object   - Where to put method's return value (if
 106  *                                    any). If NULL, no value is returned.
 107  *                  parameter_type  - Type of Parameter list
 108  *                  return_object   - Where to put method's return value (if
 109  *                                    any). If NULL, no value is returned.
 110  *                  pass_number     - Parse or execute pass
 111  *
 112  * RETURN:      Status
 113  *
 114  * DESCRIPTION: Execute a control method
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status acpi_ps_execute_method(struct acpi_evaluate_info * info)
 119 {
 120         acpi_status status;
 121         union acpi_parse_object *op;
 122         struct acpi_walk_state *walk_state;
 123
 124         ACPI_FUNCTION_TRACE(ps_execute_method);
 125
 126         /* Quick validation of DSDT header */
 127
 128         acpi_tb_check_dsdt_header();
 129
 130         /* Validate the Info and method Node */
 131
 132         if (!info || !info->node) {
 133                 return_ACPI_STATUS(AE_NULL_ENTRY);
 134         }
 135
 136         /* Init for new method, wait on concurrency semaphore */
 137
 138         status =
 139             acpi_ds_begin_method_execution(info->node, info->obj_desc, NULL);
 140         if (ACPI_FAILURE(status)) {
 141                 return_ACPI_STATUS(status);
 142         }
 143
 144         /*
 145          * The caller "owns" the parameters, so give each one an extra reference
 146          */
 147         acpi_ps_update_parameter_list(info, REF_INCREMENT);
 148
 149         /*
 150          * Execute the method. Performs parse simultaneously
 151          */
 152         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 153                           "**** Begin Method Parse/Execute [%4.4s] **** Node=%p Obj=%p\n",
 154                           info->node->name.ascii, info->node, info->obj_desc));
 155
 156         /* Create and init a Root Node */
 157
 158         op = acpi_ps_create_scope_op(info->obj_desc->method.aml_start);
 159         if (!op) {
 160                 status = AE_NO_MEMORY;
 161                 goto cleanup;
 162         }
 163
 164         /* Create and initialize a new walk state */
 165
 166         info->pass_number = ACPI_IMODE_EXECUTE;
 167         walk_state =
 168             acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
 169                                       NULL, NULL);
 170         if (!walk_state) {
 171                 status = AE_NO_MEMORY;
 172                 goto cleanup;
 173         }
 174
 175         status = acpi_ds_init_aml_walk(walk_state, op, info->node,
 176                                        info->obj_desc->method.aml_start,
 177                                        info->obj_desc->method.aml_length, info,
 178                                        info->pass_number);
 179         if (ACPI_FAILURE(status)) {
 180                 acpi_ds_delete_walk_state(walk_state);
 181                 goto cleanup;
 182         }
 183
 184         if (info->obj_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) {
 185                 walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
 186         }
 187
 188         /* Invoke an internal method if necessary */
 189
 190         if (info->obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) {
 191                 status =
 192                     info->obj_desc->method.dispatch.implementation(walk_state);
 193                 info->return_object = walk_state->return_desc;
 194
 195                 /* Cleanup states */
 196
 197                 acpi_ds_scope_stack_clear(walk_state);
 198                 acpi_ps_cleanup_scope(&walk_state->parser_state);
 199                 acpi_ds_terminate_control_method(walk_state->method_desc,
 200                                                  walk_state);
 201                 acpi_ds_delete_walk_state(walk_state);
 202                 goto cleanup;
 203         }
 204
 205         /*
 206          * Start method evaluation with an implicit return of zero.
 207          * This is done for Windows compatibility.
 208          */
 209         if (acpi_gbl_enable_interpreter_slack) {
 210                 walk_state->implicit_return_obj =
 211                     acpi_ut_create_integer_object((u64) 0);
 212                 if (!walk_state->implicit_return_obj) {
 213                         status = AE_NO_MEMORY;
 214                         acpi_ds_delete_walk_state(walk_state);
 215                         goto cleanup;
 216                 }
 217         }
 218
 219         /* Parse the AML */
 220
 221         status = acpi_ps_parse_aml(walk_state);
 222
 223         /* walk_state was deleted by parse_aml */
 224
 225 cleanup:
 226         acpi_ps_delete_parse_tree(op);
 227
 228         /* Take away the extra reference that we gave the parameters above */
 229
 230         acpi_ps_update_parameter_list(info, REF_DECREMENT);
 231
 232         /* Exit now if error above */
 233
 234         if (ACPI_FAILURE(status)) {
 235                 return_ACPI_STATUS(status);
 236         }
 237
 238         /*
 239          * If the method has returned an object, signal this to the caller with
 240          * a control exception code
 241          */
 242         if (info->return_object) {
 243                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Method returned ObjDesc=%p\n",
 244                                   info->return_object));
 245                 ACPI_DUMP_STACK_ENTRY(info->return_object);
 246
 247                 status = AE_CTRL_RETURN_VALUE;
 248         }
 249
 250         return_ACPI_STATUS(status);
 251 }
 252
 253 /*******************************************************************************
 254  *
 255  * FUNCTION:    acpi_ps_update_parameter_list
 256  *
 257  * PARAMETERS:  info            - See struct acpi_evaluate_info
 258  *                                (Used: parameter_type and Parameters)
 259  *              action          - Add or Remove reference
 260  *
 261  * RETURN:      Status
 262  *
 263  * DESCRIPTION: Update reference count on all method parameter objects
 264  *
 265  ******************************************************************************/
 266
 267 static void
 268 acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action)
 269 {
 270         u32 i;
 271
 272         if (info->parameters) {
 273
 274                 /* Update reference count for each parameter */
 275
 276                 for (i = 0; info->parameters[i]; i++) {
 277
 278                         /* Ignore errors, just do them all */
 279
 280                         (void)acpi_ut_update_object_reference(info->
 281                                                               parameters[i],
 282                                                               action);
 283                 }
 284         }
 285 }