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6595 | serge | 1 | /****************************************************************************** |
2 | * |
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3 | * Module Name: dsmethod - Parser/Interpreter interface - control method parsing |
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4 | * |
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5 | *****************************************************************************/ |
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6 | |||
7 | /* |
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8 | * Copyright (C) 2000 - 2015, Intel Corp. |
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9 | * All rights reserved. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * 1. Redistributions of source code must retain the above copyright |
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15 | * notice, this list of conditions, and the following disclaimer, |
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16 | * without modification. |
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17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
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18 | * substantially similar to the "NO WARRANTY" disclaimer below |
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19 | * ("Disclaimer") and any redistribution must be conditioned upon |
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20 | * including a substantially similar Disclaimer requirement for further |
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21 | * binary redistribution. |
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22 | * 3. Neither the names of the above-listed copyright holders nor the names |
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23 | * of any contributors may be used to endorse or promote products derived |
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24 | * from this software without specific prior written permission. |
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25 | * |
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26 | * Alternatively, this software may be distributed under the terms of the |
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27 | * GNU General Public License ("GPL") version 2 as published by the Free |
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28 | * Software Foundation. |
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29 | * |
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30 | * NO WARRANTY |
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31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
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34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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41 | * POSSIBILITY OF SUCH DAMAGES. |
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42 | */ |
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43 | |||
44 | #include |
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45 | #include "accommon.h" |
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46 | #include "acdispat.h" |
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47 | #include "acinterp.h" |
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48 | #include "acnamesp.h" |
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49 | #include "acparser.h" |
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50 | #include "amlcode.h" |
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51 | #include "acdebug.h" |
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52 | |||
53 | #define _COMPONENT ACPI_DISPATCHER |
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54 | ACPI_MODULE_NAME("dsmethod") |
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55 | |||
56 | /* Local prototypes */ |
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57 | static acpi_status |
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58 | acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state, |
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59 | union acpi_parse_object **out_op); |
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60 | |||
61 | static acpi_status |
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62 | acpi_ds_create_method_mutex(union acpi_operand_object *method_desc); |
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63 | |||
64 | /******************************************************************************* |
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65 | * |
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66 | * FUNCTION: acpi_ds_auto_serialize_method |
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67 | * |
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68 | * PARAMETERS: node - Namespace Node of the method |
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69 | * obj_desc - Method object attached to node |
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70 | * |
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71 | * RETURN: Status |
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72 | * |
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73 | * DESCRIPTION: Parse a control method AML to scan for control methods that |
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74 | * need serialization due to the creation of named objects. |
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75 | * |
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76 | * NOTE: It is a bit of overkill to mark all such methods serialized, since |
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77 | * there is only a problem if the method actually blocks during execution. |
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78 | * A blocking operation is, for example, a Sleep() operation, or any access |
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79 | * to an operation region. However, it is probably not possible to easily |
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80 | * detect whether a method will block or not, so we simply mark all suspicious |
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81 | * methods as serialized. |
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82 | * |
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83 | * NOTE2: This code is essentially a generic routine for parsing a single |
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84 | * control method. |
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85 | * |
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86 | ******************************************************************************/ |
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87 | |||
88 | acpi_status |
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89 | acpi_ds_auto_serialize_method(struct acpi_namespace_node *node, |
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90 | union acpi_operand_object *obj_desc) |
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91 | { |
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92 | acpi_status status; |
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93 | union acpi_parse_object *op = NULL; |
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94 | struct acpi_walk_state *walk_state; |
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95 | |||
96 | ACPI_FUNCTION_TRACE_PTR(ds_auto_serialize_method, node); |
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97 | |||
98 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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99 | "Method auto-serialization parse [%4.4s] %p\n", |
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100 | acpi_ut_get_node_name(node), node)); |
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101 | |||
102 | /* Create/Init a root op for the method parse tree */ |
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103 | |||
104 | op = acpi_ps_alloc_op(AML_METHOD_OP, obj_desc->method.aml_start); |
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105 | if (!op) { |
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106 | return_ACPI_STATUS(AE_NO_MEMORY); |
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107 | } |
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108 | |||
109 | acpi_ps_set_name(op, node->name.integer); |
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110 | op->common.node = node; |
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111 | |||
112 | /* Create and initialize a new walk state */ |
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113 | |||
114 | walk_state = |
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115 | acpi_ds_create_walk_state(node->owner_id, NULL, NULL, NULL); |
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116 | if (!walk_state) { |
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117 | acpi_ps_free_op(op); |
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118 | return_ACPI_STATUS(AE_NO_MEMORY); |
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119 | } |
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120 | |||
121 | status = |
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122 | acpi_ds_init_aml_walk(walk_state, op, node, |
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123 | obj_desc->method.aml_start, |
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124 | obj_desc->method.aml_length, NULL, 0); |
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125 | if (ACPI_FAILURE(status)) { |
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126 | acpi_ds_delete_walk_state(walk_state); |
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127 | acpi_ps_free_op(op); |
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128 | return_ACPI_STATUS(status); |
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129 | } |
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130 | |||
131 | walk_state->descending_callback = acpi_ds_detect_named_opcodes; |
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132 | |||
133 | /* Parse the method, scan for creation of named objects */ |
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134 | |||
135 | status = acpi_ps_parse_aml(walk_state); |
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136 | |||
137 | acpi_ps_delete_parse_tree(op); |
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138 | return_ACPI_STATUS(status); |
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139 | } |
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140 | |||
141 | /******************************************************************************* |
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142 | * |
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143 | * FUNCTION: acpi_ds_detect_named_opcodes |
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144 | * |
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145 | * PARAMETERS: walk_state - Current state of the parse tree walk |
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146 | * out_op - Unused, required for parser interface |
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147 | * |
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148 | * RETURN: Status |
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149 | * |
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150 | * DESCRIPTION: Descending callback used during the loading of ACPI tables. |
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151 | * Currently used to detect methods that must be marked serialized |
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152 | * in order to avoid problems with the creation of named objects. |
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153 | * |
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154 | ******************************************************************************/ |
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155 | |||
156 | static acpi_status |
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157 | acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state, |
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158 | union acpi_parse_object **out_op) |
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159 | { |
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160 | |||
161 | ACPI_FUNCTION_NAME(acpi_ds_detect_named_opcodes); |
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162 | |||
163 | /* We are only interested in opcodes that create a new name */ |
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164 | |||
165 | if (! |
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166 | (walk_state->op_info-> |
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167 | flags & (AML_NAMED | AML_CREATE | AML_FIELD))) { |
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168 | return (AE_OK); |
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169 | } |
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170 | |||
171 | /* |
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172 | * At this point, we know we have a Named object opcode. |
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173 | * Mark the method as serialized. Later code will create a mutex for |
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174 | * this method to enforce serialization. |
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175 | * |
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176 | * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the |
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177 | * Sync Level mechanism for this method, even though it is now serialized. |
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178 | * Otherwise, there can be conflicts with existing ASL code that actually |
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179 | * uses sync levels. |
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180 | */ |
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181 | walk_state->method_desc->method.sync_level = 0; |
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182 | walk_state->method_desc->method.info_flags |= |
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183 | (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL); |
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184 | |||
185 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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186 | "Method serialized [%4.4s] %p - [%s] (%4.4X)\n", |
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187 | walk_state->method_node->name.ascii, |
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188 | walk_state->method_node, walk_state->op_info->name, |
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189 | walk_state->opcode)); |
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190 | |||
191 | /* Abort the parse, no need to examine this method any further */ |
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192 | |||
193 | return (AE_CTRL_TERMINATE); |
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194 | } |
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195 | |||
196 | /******************************************************************************* |
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197 | * |
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198 | * FUNCTION: acpi_ds_method_error |
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199 | * |
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200 | * PARAMETERS: status - Execution status |
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201 | * walk_state - Current state |
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202 | * |
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203 | * RETURN: Status |
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204 | * |
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205 | * DESCRIPTION: Called on method error. Invoke the global exception handler if |
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206 | * present, dump the method data if the debugger is configured |
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207 | * |
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208 | * Note: Allows the exception handler to change the status code |
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209 | * |
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210 | ******************************************************************************/ |
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211 | |||
212 | acpi_status |
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213 | acpi_ds_method_error(acpi_status status, struct acpi_walk_state * walk_state) |
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214 | { |
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215 | u32 aml_offset; |
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216 | |||
217 | ACPI_FUNCTION_ENTRY(); |
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218 | |||
219 | /* Ignore AE_OK and control exception codes */ |
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220 | |||
221 | if (ACPI_SUCCESS(status) || (status & AE_CODE_CONTROL)) { |
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222 | return (status); |
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223 | } |
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224 | |||
225 | /* Invoke the global exception handler */ |
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226 | |||
227 | if (acpi_gbl_exception_handler) { |
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228 | |||
229 | /* Exit the interpreter, allow handler to execute methods */ |
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230 | |||
231 | acpi_ex_exit_interpreter(); |
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232 | |||
233 | /* |
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234 | * Handler can map the exception code to anything it wants, including |
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235 | * AE_OK, in which case the executing method will not be aborted. |
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236 | */ |
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237 | aml_offset = (u32)ACPI_PTR_DIFF(walk_state->aml, |
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238 | walk_state->parser_state. |
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239 | aml_start); |
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240 | |||
241 | status = acpi_gbl_exception_handler(status, |
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242 | walk_state->method_node ? |
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243 | walk_state->method_node-> |
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244 | name.integer : 0, |
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245 | walk_state->opcode, |
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246 | aml_offset, NULL); |
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247 | acpi_ex_enter_interpreter(); |
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248 | } |
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249 | |||
250 | acpi_ds_clear_implicit_return(walk_state); |
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251 | |||
252 | if (ACPI_FAILURE(status)) { |
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253 | acpi_ds_dump_method_stack(status, walk_state, walk_state->op); |
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254 | |||
255 | /* Display method locals/args if debugger is present */ |
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256 | |||
257 | #ifdef ACPI_DEBUGGER |
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258 | acpi_db_dump_method_info(status, walk_state); |
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259 | #endif |
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260 | } |
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261 | |||
262 | return (status); |
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263 | } |
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264 | |||
265 | /******************************************************************************* |
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266 | * |
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267 | * FUNCTION: acpi_ds_create_method_mutex |
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268 | * |
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269 | * PARAMETERS: obj_desc - The method object |
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270 | * |
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271 | * RETURN: Status |
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272 | * |
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273 | * DESCRIPTION: Create a mutex object for a serialized control method |
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274 | * |
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275 | ******************************************************************************/ |
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276 | |||
277 | static acpi_status |
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278 | acpi_ds_create_method_mutex(union acpi_operand_object *method_desc) |
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279 | { |
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280 | union acpi_operand_object *mutex_desc; |
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281 | acpi_status status; |
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282 | |||
283 | ACPI_FUNCTION_TRACE(ds_create_method_mutex); |
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284 | |||
285 | /* Create the new mutex object */ |
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286 | |||
287 | mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX); |
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288 | if (!mutex_desc) { |
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289 | return_ACPI_STATUS(AE_NO_MEMORY); |
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290 | } |
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291 | |||
292 | /* Create the actual OS Mutex */ |
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293 | |||
294 | status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex); |
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295 | if (ACPI_FAILURE(status)) { |
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296 | acpi_ut_delete_object_desc(mutex_desc); |
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297 | return_ACPI_STATUS(status); |
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298 | } |
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299 | |||
300 | mutex_desc->mutex.sync_level = method_desc->method.sync_level; |
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301 | method_desc->method.mutex = mutex_desc; |
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302 | return_ACPI_STATUS(AE_OK); |
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303 | } |
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304 | |||
305 | /******************************************************************************* |
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306 | * |
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307 | * FUNCTION: acpi_ds_begin_method_execution |
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308 | * |
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309 | * PARAMETERS: method_node - Node of the method |
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310 | * obj_desc - The method object |
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311 | * walk_state - current state, NULL if not yet executing |
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312 | * a method. |
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313 | * |
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314 | * RETURN: Status |
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315 | * |
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316 | * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, |
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317 | * increments the thread count, and waits at the method semaphore |
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318 | * for clearance to execute. |
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319 | * |
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320 | ******************************************************************************/ |
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321 | |||
322 | acpi_status |
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323 | acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, |
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324 | union acpi_operand_object *obj_desc, |
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325 | struct acpi_walk_state *walk_state) |
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326 | { |
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327 | acpi_status status = AE_OK; |
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328 | |||
329 | ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node); |
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330 | |||
331 | if (!method_node) { |
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332 | return_ACPI_STATUS(AE_NULL_ENTRY); |
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333 | } |
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334 | |||
335 | acpi_ex_start_trace_method(method_node, obj_desc, walk_state); |
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336 | |||
337 | /* Prevent wraparound of thread count */ |
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338 | |||
339 | if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { |
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340 | ACPI_ERROR((AE_INFO, |
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341 | "Method reached maximum reentrancy limit (255)")); |
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342 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); |
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343 | } |
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344 | |||
345 | /* |
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346 | * If this method is serialized, we need to acquire the method mutex. |
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347 | */ |
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348 | if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) { |
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349 | /* |
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350 | * Create a mutex for the method if it is defined to be Serialized |
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351 | * and a mutex has not already been created. We defer the mutex creation |
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352 | * until a method is actually executed, to minimize the object count |
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353 | */ |
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354 | if (!obj_desc->method.mutex) { |
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355 | status = acpi_ds_create_method_mutex(obj_desc); |
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356 | if (ACPI_FAILURE(status)) { |
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357 | return_ACPI_STATUS(status); |
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358 | } |
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359 | } |
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360 | |||
361 | /* |
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362 | * The current_sync_level (per-thread) must be less than or equal to |
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363 | * the sync level of the method. This mechanism provides some |
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364 | * deadlock prevention. |
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365 | * |
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366 | * If the method was auto-serialized, we just ignore the sync level |
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367 | * mechanism, because auto-serialization of methods can interfere |
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368 | * with ASL code that actually uses sync levels. |
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369 | * |
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370 | * Top-level method invocation has no walk state at this point |
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371 | */ |
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372 | if (walk_state && |
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373 | (!(obj_desc->method. |
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374 | info_flags & ACPI_METHOD_IGNORE_SYNC_LEVEL)) |
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375 | && (walk_state->thread->current_sync_level > |
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376 | obj_desc->method.mutex->mutex.sync_level)) { |
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377 | ACPI_ERROR((AE_INFO, |
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378 | "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%u)", |
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379 | acpi_ut_get_node_name(method_node), |
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380 | walk_state->thread->current_sync_level)); |
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381 | |||
382 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
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383 | } |
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384 | |||
385 | /* |
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386 | * Obtain the method mutex if necessary. Do not acquire mutex for a |
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387 | * recursive call. |
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388 | */ |
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389 | if (!walk_state || |
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390 | !obj_desc->method.mutex->mutex.thread_id || |
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391 | (walk_state->thread->thread_id != |
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392 | obj_desc->method.mutex->mutex.thread_id)) { |
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393 | /* |
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394 | * Acquire the method mutex. This releases the interpreter if we |
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395 | * block (and reacquires it before it returns) |
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396 | */ |
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397 | status = |
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398 | acpi_ex_system_wait_mutex(obj_desc->method.mutex-> |
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399 | mutex.os_mutex, |
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400 | ACPI_WAIT_FOREVER); |
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401 | if (ACPI_FAILURE(status)) { |
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402 | return_ACPI_STATUS(status); |
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403 | } |
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404 | |||
405 | /* Update the mutex and walk info and save the original sync_level */ |
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406 | |||
407 | if (walk_state) { |
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408 | obj_desc->method.mutex->mutex. |
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409 | original_sync_level = |
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410 | walk_state->thread->current_sync_level; |
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411 | |||
412 | obj_desc->method.mutex->mutex.thread_id = |
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413 | walk_state->thread->thread_id; |
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414 | walk_state->thread->current_sync_level = |
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415 | obj_desc->method.sync_level; |
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416 | } else { |
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417 | obj_desc->method.mutex->mutex. |
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418 | original_sync_level = |
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419 | obj_desc->method.mutex->mutex.sync_level; |
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420 | |||
421 | obj_desc->method.mutex->mutex.thread_id = |
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422 | acpi_os_get_thread_id(); |
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423 | } |
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424 | } |
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425 | |||
426 | /* Always increase acquisition depth */ |
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427 | |||
428 | obj_desc->method.mutex->mutex.acquisition_depth++; |
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429 | } |
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430 | |||
431 | /* |
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432 | * Allocate an Owner ID for this method, only if this is the first thread |
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433 | * to begin concurrent execution. We only need one owner_id, even if the |
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434 | * method is invoked recursively. |
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435 | */ |
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436 | if (!obj_desc->method.owner_id) { |
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437 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); |
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438 | if (ACPI_FAILURE(status)) { |
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439 | goto cleanup; |
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440 | } |
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441 | } |
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442 | |||
443 | /* |
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444 | * Increment the method parse tree thread count since it has been |
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445 | * reentered one more time (even if it is the same thread) |
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446 | */ |
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447 | obj_desc->method.thread_count++; |
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448 | acpi_method_count++; |
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449 | return_ACPI_STATUS(status); |
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450 | |||
451 | cleanup: |
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452 | /* On error, must release the method mutex (if present) */ |
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453 | |||
454 | if (obj_desc->method.mutex) { |
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455 | acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex); |
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456 | } |
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457 | return_ACPI_STATUS(status); |
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458 | } |
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459 | |||
460 | /******************************************************************************* |
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461 | * |
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462 | * FUNCTION: acpi_ds_call_control_method |
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463 | * |
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464 | * PARAMETERS: thread - Info for this thread |
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465 | * this_walk_state - Current walk state |
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466 | * op - Current Op to be walked |
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467 | * |
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468 | * RETURN: Status |
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469 | * |
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470 | * DESCRIPTION: Transfer execution to a called control method |
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471 | * |
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472 | ******************************************************************************/ |
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473 | |||
474 | acpi_status |
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475 | acpi_ds_call_control_method(struct acpi_thread_state *thread, |
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476 | struct acpi_walk_state *this_walk_state, |
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477 | union acpi_parse_object *op) |
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478 | { |
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479 | acpi_status status; |
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480 | struct acpi_namespace_node *method_node; |
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481 | struct acpi_walk_state *next_walk_state = NULL; |
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482 | union acpi_operand_object *obj_desc; |
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483 | struct acpi_evaluate_info *info; |
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484 | u32 i; |
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485 | |||
486 | ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state); |
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487 | |||
488 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
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489 | "Calling method %p, currentstate=%p\n", |
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490 | this_walk_state->prev_op, this_walk_state)); |
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491 | |||
492 | /* |
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493 | * Get the namespace entry for the control method we are about to call |
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494 | */ |
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495 | method_node = this_walk_state->method_call_node; |
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496 | if (!method_node) { |
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497 | return_ACPI_STATUS(AE_NULL_ENTRY); |
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498 | } |
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499 | |||
500 | obj_desc = acpi_ns_get_attached_object(method_node); |
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501 | if (!obj_desc) { |
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502 | return_ACPI_STATUS(AE_NULL_OBJECT); |
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503 | } |
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504 | |||
505 | /* Init for new method, possibly wait on method mutex */ |
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506 | |||
507 | status = acpi_ds_begin_method_execution(method_node, obj_desc, |
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508 | this_walk_state); |
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509 | if (ACPI_FAILURE(status)) { |
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510 | return_ACPI_STATUS(status); |
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511 | } |
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512 | |||
513 | /* Begin method parse/execution. Create a new walk state */ |
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514 | |||
515 | next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id, |
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516 | NULL, obj_desc, thread); |
||
517 | if (!next_walk_state) { |
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518 | status = AE_NO_MEMORY; |
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519 | goto cleanup; |
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520 | } |
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521 | |||
522 | /* |
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523 | * The resolved arguments were put on the previous walk state's operand |
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524 | * stack. Operands on the previous walk state stack always |
||
525 | * start at index 0. Also, null terminate the list of arguments |
||
526 | */ |
||
527 | this_walk_state->operands[this_walk_state->num_operands] = NULL; |
||
528 | |||
529 | /* |
||
530 | * Allocate and initialize the evaluation information block |
||
531 | * TBD: this is somewhat inefficient, should change interface to |
||
532 | * ds_init_aml_walk. For now, keeps this struct off the CPU stack |
||
533 | */ |
||
534 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); |
||
535 | if (!info) { |
||
536 | status = AE_NO_MEMORY; |
||
537 | goto cleanup; |
||
538 | } |
||
539 | |||
540 | info->parameters = &this_walk_state->operands[0]; |
||
541 | |||
542 | status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
||
543 | obj_desc->method.aml_start, |
||
544 | obj_desc->method.aml_length, info, |
||
545 | ACPI_IMODE_EXECUTE); |
||
546 | |||
547 | ACPI_FREE(info); |
||
548 | if (ACPI_FAILURE(status)) { |
||
549 | goto cleanup; |
||
550 | } |
||
551 | |||
552 | /* |
||
553 | * Delete the operands on the previous walkstate operand stack |
||
554 | * (they were copied to new objects) |
||
555 | */ |
||
556 | for (i = 0; i < obj_desc->method.param_count; i++) { |
||
557 | acpi_ut_remove_reference(this_walk_state->operands[i]); |
||
558 | this_walk_state->operands[i] = NULL; |
||
559 | } |
||
560 | |||
561 | /* Clear the operand stack */ |
||
562 | |||
563 | this_walk_state->num_operands = 0; |
||
564 | |||
565 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
||
566 | "**** Begin nested execution of [%4.4s] **** WalkState=%p\n", |
||
567 | method_node->name.ascii, next_walk_state)); |
||
568 | |||
569 | /* Invoke an internal method if necessary */ |
||
570 | |||
571 | if (obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) { |
||
572 | status = |
||
573 | obj_desc->method.dispatch.implementation(next_walk_state); |
||
574 | if (status == AE_OK) { |
||
575 | status = AE_CTRL_TERMINATE; |
||
576 | } |
||
577 | } |
||
578 | |||
579 | return_ACPI_STATUS(status); |
||
580 | |||
581 | cleanup: |
||
582 | |||
583 | /* On error, we must terminate the method properly */ |
||
584 | |||
585 | acpi_ds_terminate_control_method(obj_desc, next_walk_state); |
||
586 | acpi_ds_delete_walk_state(next_walk_state); |
||
587 | |||
588 | return_ACPI_STATUS(status); |
||
589 | } |
||
590 | |||
591 | /******************************************************************************* |
||
592 | * |
||
593 | * FUNCTION: acpi_ds_restart_control_method |
||
594 | * |
||
595 | * PARAMETERS: walk_state - State for preempted method (caller) |
||
596 | * return_desc - Return value from the called method |
||
597 | * |
||
598 | * RETURN: Status |
||
599 | * |
||
600 | * DESCRIPTION: Restart a method that was preempted by another (nested) method |
||
601 | * invocation. Handle the return value (if any) from the callee. |
||
602 | * |
||
603 | ******************************************************************************/ |
||
604 | |||
605 | acpi_status |
||
606 | acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
||
607 | union acpi_operand_object *return_desc) |
||
608 | { |
||
609 | acpi_status status; |
||
610 | int same_as_implicit_return; |
||
611 | |||
612 | ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state); |
||
613 | |||
614 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
||
615 | "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n", |
||
616 | acpi_ut_get_node_name(walk_state->method_node), |
||
617 | walk_state->method_call_op, return_desc)); |
||
618 | |||
619 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
||
620 | " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n", |
||
621 | walk_state->return_used, |
||
622 | walk_state->results, walk_state)); |
||
623 | |||
624 | /* Did the called method return a value? */ |
||
625 | |||
626 | if (return_desc) { |
||
627 | |||
628 | /* Is the implicit return object the same as the return desc? */ |
||
629 | |||
630 | same_as_implicit_return = |
||
631 | (walk_state->implicit_return_obj == return_desc); |
||
632 | |||
633 | /* Are we actually going to use the return value? */ |
||
634 | |||
635 | if (walk_state->return_used) { |
||
636 | |||
637 | /* Save the return value from the previous method */ |
||
638 | |||
639 | status = acpi_ds_result_push(return_desc, walk_state); |
||
640 | if (ACPI_FAILURE(status)) { |
||
641 | acpi_ut_remove_reference(return_desc); |
||
642 | return_ACPI_STATUS(status); |
||
643 | } |
||
644 | |||
645 | /* |
||
646 | * Save as THIS method's return value in case it is returned |
||
647 | * immediately to yet another method |
||
648 | */ |
||
649 | walk_state->return_desc = return_desc; |
||
650 | } |
||
651 | |||
652 | /* |
||
653 | * The following code is the optional support for the so-called |
||
654 | * "implicit return". Some AML code assumes that the last value of the |
||
655 | * method is "implicitly" returned to the caller, in the absence of an |
||
656 | * explicit return value. |
||
657 | * |
||
658 | * Just save the last result of the method as the return value. |
||
659 | * |
||
660 | * NOTE: this is optional because the ASL language does not actually |
||
661 | * support this behavior. |
||
662 | */ |
||
663 | else if (!acpi_ds_do_implicit_return |
||
664 | (return_desc, walk_state, FALSE) |
||
665 | || same_as_implicit_return) { |
||
666 | /* |
||
667 | * Delete the return value if it will not be used by the |
||
668 | * calling method or remove one reference if the explicit return |
||
669 | * is the same as the implicit return value. |
||
670 | */ |
||
671 | acpi_ut_remove_reference(return_desc); |
||
672 | } |
||
673 | } |
||
674 | |||
675 | return_ACPI_STATUS(AE_OK); |
||
676 | } |
||
677 | |||
678 | /******************************************************************************* |
||
679 | * |
||
680 | * FUNCTION: acpi_ds_terminate_control_method |
||
681 | * |
||
682 | * PARAMETERS: method_desc - Method object |
||
683 | * walk_state - State associated with the method |
||
684 | * |
||
685 | * RETURN: None |
||
686 | * |
||
687 | * DESCRIPTION: Terminate a control method. Delete everything that the method |
||
688 | * created, delete all locals and arguments, and delete the parse |
||
689 | * tree if requested. |
||
690 | * |
||
691 | * MUTEX: Interpreter is locked |
||
692 | * |
||
693 | ******************************************************************************/ |
||
694 | |||
695 | void |
||
696 | acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, |
||
697 | struct acpi_walk_state *walk_state) |
||
698 | { |
||
699 | |||
700 | ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state); |
||
701 | |||
702 | /* method_desc is required, walk_state is optional */ |
||
703 | |||
704 | if (!method_desc) { |
||
705 | return_VOID; |
||
706 | } |
||
707 | |||
708 | if (walk_state) { |
||
709 | |||
710 | /* Delete all arguments and locals */ |
||
711 | |||
712 | acpi_ds_method_data_delete_all(walk_state); |
||
713 | |||
714 | /* |
||
715 | * If method is serialized, release the mutex and restore the |
||
716 | * current sync level for this thread |
||
717 | */ |
||
718 | if (method_desc->method.mutex) { |
||
719 | |||
720 | /* Acquisition Depth handles recursive calls */ |
||
721 | |||
722 | method_desc->method.mutex->mutex.acquisition_depth--; |
||
723 | if (!method_desc->method.mutex->mutex.acquisition_depth) { |
||
724 | walk_state->thread->current_sync_level = |
||
725 | method_desc->method.mutex->mutex. |
||
726 | original_sync_level; |
||
727 | |||
728 | acpi_os_release_mutex(method_desc->method. |
||
729 | mutex->mutex.os_mutex); |
||
730 | method_desc->method.mutex->mutex.thread_id = 0; |
||
731 | } |
||
732 | } |
||
733 | |||
734 | /* |
||
735 | * Delete any namespace objects created anywhere within the |
||
736 | * namespace by the execution of this method. Unless: |
||
737 | * 1) This method is a module-level executable code method, in which |
||
738 | * case we want make the objects permanent. |
||
739 | * 2) There are other threads executing the method, in which case we |
||
740 | * will wait until the last thread has completed. |
||
741 | */ |
||
742 | if (!(method_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) |
||
743 | && (method_desc->method.thread_count == 1)) { |
||
744 | |||
745 | /* Delete any direct children of (created by) this method */ |
||
746 | |||
747 | acpi_ns_delete_namespace_subtree(walk_state-> |
||
748 | method_node); |
||
749 | |||
750 | /* |
||
751 | * Delete any objects that were created by this method |
||
752 | * elsewhere in the namespace (if any were created). |
||
753 | * Use of the ACPI_METHOD_MODIFIED_NAMESPACE optimizes the |
||
754 | * deletion such that we don't have to perform an entire |
||
755 | * namespace walk for every control method execution. |
||
756 | */ |
||
757 | if (method_desc->method. |
||
758 | info_flags & ACPI_METHOD_MODIFIED_NAMESPACE) { |
||
759 | acpi_ns_delete_namespace_by_owner(method_desc-> |
||
760 | method. |
||
761 | owner_id); |
||
762 | method_desc->method.info_flags &= |
||
763 | ~ACPI_METHOD_MODIFIED_NAMESPACE; |
||
764 | } |
||
765 | } |
||
766 | } |
||
767 | |||
768 | /* Decrement the thread count on the method */ |
||
769 | |||
770 | if (method_desc->method.thread_count) { |
||
771 | method_desc->method.thread_count--; |
||
772 | } else { |
||
773 | ACPI_ERROR((AE_INFO, "Invalid zero thread count in method")); |
||
774 | } |
||
775 | |||
776 | /* Are there any other threads currently executing this method? */ |
||
777 | |||
778 | if (method_desc->method.thread_count) { |
||
779 | /* |
||
780 | * Additional threads. Do not release the owner_id in this case, |
||
781 | * we immediately reuse it for the next thread executing this method |
||
782 | */ |
||
783 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
||
784 | "*** Completed execution of one thread, %u threads remaining\n", |
||
785 | method_desc->method.thread_count)); |
||
786 | } else { |
||
787 | /* This is the only executing thread for this method */ |
||
788 | |||
789 | /* |
||
790 | * Support to dynamically change a method from not_serialized to |
||
791 | * Serialized if it appears that the method is incorrectly written and |
||
792 | * does not support multiple thread execution. The best example of this |
||
793 | * is if such a method creates namespace objects and blocks. A second |
||
794 | * thread will fail with an AE_ALREADY_EXISTS exception. |
||
795 | * |
||
796 | * This code is here because we must wait until the last thread exits |
||
797 | * before marking the method as serialized. |
||
798 | */ |
||
799 | if (method_desc->method. |
||
800 | info_flags & ACPI_METHOD_SERIALIZED_PENDING) { |
||
801 | if (walk_state) { |
||
802 | ACPI_INFO((AE_INFO, |
||
803 | "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error", |
||
804 | walk_state->method_node->name. |
||
805 | ascii)); |
||
806 | } |
||
807 | |||
808 | /* |
||
809 | * Method tried to create an object twice and was marked as |
||
810 | * "pending serialized". The probable cause is that the method |
||
811 | * cannot handle reentrancy. |
||
812 | * |
||
813 | * The method was created as not_serialized, but it tried to create |
||
814 | * a named object and then blocked, causing the second thread |
||
815 | * entrance to begin and then fail. Workaround this problem by |
||
816 | * marking the method permanently as Serialized when the last |
||
817 | * thread exits here. |
||
818 | */ |
||
819 | method_desc->method.info_flags &= |
||
820 | ~ACPI_METHOD_SERIALIZED_PENDING; |
||
821 | method_desc->method.info_flags |= |
||
822 | (ACPI_METHOD_SERIALIZED | |
||
823 | ACPI_METHOD_IGNORE_SYNC_LEVEL); |
||
824 | method_desc->method.sync_level = 0; |
||
825 | } |
||
826 | |||
827 | /* No more threads, we can free the owner_id */ |
||
828 | |||
829 | if (! |
||
830 | (method_desc->method. |
||
831 | info_flags & ACPI_METHOD_MODULE_LEVEL)) { |
||
832 | acpi_ut_release_owner_id(&method_desc->method.owner_id); |
||
833 | } |
||
834 | } |
||
835 | |||
836 | acpi_ex_stop_trace_method((struct acpi_namespace_node *)method_desc-> |
||
837 | method.node, method_desc, walk_state); |
||
838 | |||
839 | return_VOID; |
||
840 | }> |