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6595 | serge | 1 | /****************************************************************************** |
2 | * |
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3 | * Module Name: nsload - namespace loading/expanding/contracting procedures |
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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 "acnamesp.h" |
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47 | #include "acdispat.h" |
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48 | #include "actables.h" |
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49 | |||
50 | #define _COMPONENT ACPI_NAMESPACE |
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51 | ACPI_MODULE_NAME("nsload") |
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52 | |||
53 | /* Local prototypes */ |
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54 | #ifdef ACPI_FUTURE_IMPLEMENTATION |
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55 | acpi_status acpi_ns_unload_namespace(acpi_handle handle); |
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56 | |||
57 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle); |
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58 | #endif |
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59 | |||
60 | #ifndef ACPI_NO_METHOD_EXECUTION |
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61 | /******************************************************************************* |
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62 | * |
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63 | * FUNCTION: acpi_ns_load_table |
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64 | * |
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65 | * PARAMETERS: table_index - Index for table to be loaded |
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66 | * node - Owning NS node |
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67 | * |
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68 | * RETURN: Status |
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69 | * |
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70 | * DESCRIPTION: Load one ACPI table into the namespace |
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71 | * |
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72 | ******************************************************************************/ |
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73 | |||
74 | acpi_status |
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75 | acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node) |
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76 | { |
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77 | acpi_status status; |
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78 | |||
79 | ACPI_FUNCTION_TRACE(ns_load_table); |
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80 | |||
81 | /* |
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82 | * Parse the table and load the namespace with all named |
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83 | * objects found within. Control methods are NOT parsed |
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84 | * at this time. In fact, the control methods cannot be |
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85 | * parsed until the entire namespace is loaded, because |
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86 | * if a control method makes a forward reference (call) |
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87 | * to another control method, we can't continue parsing |
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88 | * because we don't know how many arguments to parse next! |
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89 | */ |
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90 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
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91 | if (ACPI_FAILURE(status)) { |
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92 | return_ACPI_STATUS(status); |
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93 | } |
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94 | |||
95 | /* If table already loaded into namespace, just return */ |
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96 | |||
97 | if (acpi_tb_is_table_loaded(table_index)) { |
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98 | status = AE_ALREADY_EXISTS; |
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99 | goto unlock; |
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100 | } |
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101 | |||
102 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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103 | "**** Loading table into namespace ****\n")); |
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104 | |||
105 | status = acpi_tb_allocate_owner_id(table_index); |
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106 | if (ACPI_FAILURE(status)) { |
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107 | goto unlock; |
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108 | } |
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109 | |||
110 | status = acpi_ns_parse_table(table_index, node); |
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111 | if (ACPI_SUCCESS(status)) { |
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112 | acpi_tb_set_table_loaded_flag(table_index, TRUE); |
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113 | } else { |
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114 | /* |
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115 | * On error, delete any namespace objects created by this table. |
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116 | * We cannot initialize these objects, so delete them. There are |
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117 | * a couple of expecially bad cases: |
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118 | * AE_ALREADY_EXISTS - namespace collision. |
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119 | * AE_NOT_FOUND - the target of a Scope operator does not |
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120 | * exist. This target of Scope must already exist in the |
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121 | * namespace, as per the ACPI specification. |
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122 | */ |
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123 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
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124 | acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list. |
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125 | tables[table_index].owner_id); |
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126 | acpi_tb_release_owner_id(table_index); |
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127 | |||
128 | return_ACPI_STATUS(status); |
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129 | } |
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130 | |||
131 | unlock: |
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132 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
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133 | |||
134 | if (ACPI_FAILURE(status)) { |
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135 | return_ACPI_STATUS(status); |
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136 | } |
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137 | |||
138 | /* |
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139 | * Now we can parse the control methods. We always parse |
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140 | * them here for a sanity check, and if configured for |
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141 | * just-in-time parsing, we delete the control method |
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142 | * parse trees. |
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143 | */ |
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144 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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145 | "**** Begin Table Object Initialization\n")); |
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146 | |||
147 | status = acpi_ds_initialize_objects(table_index, node); |
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148 | |||
149 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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150 | "**** Completed Table Object Initialization\n")); |
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151 | |||
152 | return_ACPI_STATUS(status); |
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153 | } |
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154 | |||
155 | #ifdef ACPI_OBSOLETE_FUNCTIONS |
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156 | /******************************************************************************* |
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157 | * |
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158 | * FUNCTION: acpi_load_namespace |
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159 | * |
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160 | * PARAMETERS: None |
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161 | * |
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162 | * RETURN: Status |
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163 | * |
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164 | * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. |
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165 | * (DSDT points to either the BIOS or a buffer.) |
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166 | * |
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167 | ******************************************************************************/ |
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168 | |||
169 | acpi_status acpi_ns_load_namespace(void) |
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170 | { |
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171 | acpi_status status; |
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172 | |||
173 | ACPI_FUNCTION_TRACE(acpi_load_name_space); |
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174 | |||
175 | /* There must be at least a DSDT installed */ |
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176 | |||
177 | if (acpi_gbl_DSDT == NULL) { |
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178 | ACPI_ERROR((AE_INFO, "DSDT is not in memory")); |
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179 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
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180 | } |
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181 | |||
182 | /* |
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183 | * Load the namespace. The DSDT is required, |
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184 | * but the SSDT and PSDT tables are optional. |
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185 | */ |
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186 | status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT); |
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187 | if (ACPI_FAILURE(status)) { |
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188 | return_ACPI_STATUS(status); |
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189 | } |
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190 | |||
191 | /* Ignore exceptions from these */ |
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192 | |||
193 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT); |
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194 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT); |
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195 | |||
196 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
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197 | "ACPI Namespace successfully loaded at root %p\n", |
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198 | acpi_gbl_root_node)); |
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199 | |||
200 | return_ACPI_STATUS(status); |
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201 | } |
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202 | #endif |
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203 | |||
204 | #ifdef ACPI_FUTURE_IMPLEMENTATION |
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205 | /******************************************************************************* |
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206 | * |
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207 | * FUNCTION: acpi_ns_delete_subtree |
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208 | * |
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209 | * PARAMETERS: start_handle - Handle in namespace where search begins |
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210 | * |
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211 | * RETURNS Status |
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212 | * |
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213 | * DESCRIPTION: Walks the namespace starting at the given handle and deletes |
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214 | * all objects, entries, and scopes in the entire subtree. |
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215 | * |
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216 | * Namespace/Interpreter should be locked or the subsystem should |
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217 | * be in shutdown before this routine is called. |
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218 | * |
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219 | ******************************************************************************/ |
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220 | |||
221 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle) |
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222 | { |
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223 | acpi_status status; |
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224 | acpi_handle child_handle; |
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225 | acpi_handle parent_handle; |
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226 | acpi_handle next_child_handle; |
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227 | acpi_handle dummy; |
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228 | u32 level; |
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229 | |||
230 | ACPI_FUNCTION_TRACE(ns_delete_subtree); |
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231 | |||
232 | parent_handle = start_handle; |
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233 | child_handle = NULL; |
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234 | level = 1; |
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235 | |||
236 | /* |
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237 | * Traverse the tree of objects until we bubble back up |
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238 | * to where we started. |
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239 | */ |
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240 | while (level > 0) { |
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241 | |||
242 | /* Attempt to get the next object in this scope */ |
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243 | |||
244 | status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle, |
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245 | child_handle, &next_child_handle); |
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246 | |||
247 | child_handle = next_child_handle; |
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248 | |||
249 | /* Did we get a new object? */ |
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250 | |||
251 | if (ACPI_SUCCESS(status)) { |
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252 | |||
253 | /* Check if this object has any children */ |
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254 | |||
255 | if (ACPI_SUCCESS |
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256 | (acpi_get_next_object |
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257 | (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) { |
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258 | /* |
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259 | * There is at least one child of this object, |
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260 | * visit the object |
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261 | */ |
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262 | level++; |
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263 | parent_handle = child_handle; |
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264 | child_handle = NULL; |
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265 | } |
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266 | } else { |
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267 | /* |
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268 | * No more children in this object, go back up to |
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269 | * the object's parent |
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270 | */ |
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271 | level--; |
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272 | |||
273 | /* Delete all children now */ |
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274 | |||
275 | acpi_ns_delete_children(child_handle); |
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276 | |||
277 | child_handle = parent_handle; |
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278 | status = acpi_get_parent(parent_handle, &parent_handle); |
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279 | if (ACPI_FAILURE(status)) { |
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280 | return_ACPI_STATUS(status); |
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281 | } |
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282 | } |
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283 | } |
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284 | |||
285 | /* Now delete the starting object, and we are done */ |
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286 | |||
287 | acpi_ns_remove_node(child_handle); |
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288 | return_ACPI_STATUS(AE_OK); |
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289 | } |
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290 | |||
291 | /******************************************************************************* |
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292 | * |
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293 | * FUNCTION: acpi_ns_unload_name_space |
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294 | * |
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295 | * PARAMETERS: handle - Root of namespace subtree to be deleted |
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296 | * |
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297 | * RETURN: Status |
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298 | * |
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299 | * DESCRIPTION: Shrinks the namespace, typically in response to an undocking |
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300 | * event. Deletes an entire subtree starting from (and |
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301 | * including) the given handle. |
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302 | * |
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303 | ******************************************************************************/ |
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304 | |||
305 | acpi_status acpi_ns_unload_namespace(acpi_handle handle) |
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306 | { |
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307 | acpi_status status; |
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308 | |||
309 | ACPI_FUNCTION_TRACE(ns_unload_name_space); |
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310 | |||
311 | /* Parameter validation */ |
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312 | |||
313 | if (!acpi_gbl_root_node) { |
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314 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
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315 | } |
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316 | |||
317 | if (!handle) { |
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318 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
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319 | } |
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320 | |||
321 | /* This function does the real work */ |
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322 | |||
323 | status = acpi_ns_delete_subtree(handle); |
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324 | |||
325 | return_ACPI_STATUS(status); |
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326 | } |
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327 | #endif |
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328 | #endif |