Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: nssearch - Namespace search |
| 4 | * |
| 5 | ******************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 6c9deb7 | 2007-02-02 19:48:24 +0300 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2007, R. Byron Moore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <acpi/acpi.h> |
| 45 | #include <acpi/acnamesp.h> |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #define _COMPONENT ACPI_NAMESPACE |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 48 | ACPI_MODULE_NAME("nssearch") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 50 | /* Local prototypes */ |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 51 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | acpi_ns_search_parent_tree(u32 target_name, |
| 53 | struct acpi_namespace_node *node, |
| 54 | acpi_object_type type, |
| 55 | struct acpi_namespace_node **return_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | /******************************************************************************* |
| 58 | * |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 59 | * FUNCTION: acpi_ns_search_one_scope |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 61 | * PARAMETERS: target_name - Ascii ACPI name to search for |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 62 | * parent_node - Starting node where search will begin |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 63 | * Type - Object type to match |
| 64 | * return_node - Where the matched Named obj is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | * |
| 66 | * RETURN: Status |
| 67 | * |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 68 | * DESCRIPTION: Search a single level of the namespace. Performs a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * simple search of the specified level, and does not add |
| 70 | * entries or search parents. |
| 71 | * |
| 72 | * |
| 73 | * Named object lists are built (and subsequently dumped) in the |
| 74 | * order in which the names are encountered during the namespace load; |
| 75 | * |
| 76 | * All namespace searching is linear in this implementation, but |
| 77 | * could be easily modified to support any improved search |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 78 | * algorithm. However, the linear search was chosen for simplicity |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | * and because the trees are small and the other interpreter |
| 80 | * execution overhead is relatively high. |
| 81 | * |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 82 | * Note: CPU execution analysis has shown that the AML interpreter spends |
| 83 | * a very small percentage of its time searching the namespace. Therefore, |
| 84 | * the linear search seems to be sufficient, as there would seem to be |
| 85 | * little value in improving the search. |
| 86 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | ******************************************************************************/ |
| 88 | |
| 89 | acpi_status |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 90 | acpi_ns_search_one_scope(u32 target_name, |
| 91 | struct acpi_namespace_node *parent_node, |
| 92 | acpi_object_type type, |
| 93 | struct acpi_namespace_node **return_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 95 | struct acpi_namespace_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 97 | ACPI_FUNCTION_TRACE(ns_search_one_scope); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
| 99 | #ifdef ACPI_DEBUG_OUTPUT |
| 100 | if (ACPI_LV_NAMES & acpi_dbg_level) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 101 | char *scope_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 103 | scope_name = acpi_ns_get_external_pathname(parent_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | if (scope_name) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 105 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
| 106 | "Searching %s (%p) For [%4.4s] (%s)\n", |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 107 | scope_name, parent_node, |
| 108 | ACPI_CAST_PTR(char, &target_name), |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 109 | acpi_ut_get_type_name(type))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 111 | ACPI_FREE(scope_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | } |
| 114 | #endif |
| 115 | |
| 116 | /* |
| 117 | * Search for name at this namespace level, which is to say that we |
| 118 | * must search for the name among the children of this object |
| 119 | */ |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 120 | node = parent_node->child; |
| 121 | while (node) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | /* Check for match against the name */ |
| 124 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 125 | if (node->name.integer == target_name) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | /* Resolve a control method alias if any */ |
| 128 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 129 | if (acpi_ns_get_type(node) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 130 | ACPI_TYPE_LOCAL_METHOD_ALIAS) { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 131 | node = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 132 | ACPI_CAST_PTR(struct acpi_namespace_node, |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 133 | node->object); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 136 | /* Found matching entry */ |
| 137 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 138 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
| 139 | "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n", |
Bob Moore | defba1d | 2005-12-16 17:05:00 -0500 | [diff] [blame] | 140 | ACPI_CAST_PTR(char, &target_name), |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 141 | acpi_ut_get_type_name(node->type), |
| 142 | node, |
| 143 | acpi_ut_get_node_name(parent_node), |
| 144 | parent_node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 146 | *return_node = node; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 147 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /* |
| 151 | * The last entry in the list points back to the parent, |
| 152 | * so a flag is used to indicate the end-of-list |
| 153 | */ |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 154 | if (node->flags & ANOBJ_END_OF_PEER_LIST) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | /* Searched entire list, we are done */ |
| 157 | |
| 158 | break; |
| 159 | } |
| 160 | |
| 161 | /* Didn't match name, move on to the next peer object */ |
| 162 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 163 | node = node->peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | /* Searched entire namespace level, not found */ |
| 167 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 168 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
| 169 | "Name [%4.4s] (%s) not found in search in scope [%4.4s] %p first child %p\n", |
Bob Moore | defba1d | 2005-12-16 17:05:00 -0500 | [diff] [blame] | 170 | ACPI_CAST_PTR(char, &target_name), |
| 171 | acpi_ut_get_type_name(type), |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 172 | acpi_ut_get_node_name(parent_node), parent_node, |
| 173 | parent_node->child)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 175 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | /******************************************************************************* |
| 179 | * |
| 180 | * FUNCTION: acpi_ns_search_parent_tree |
| 181 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 182 | * PARAMETERS: target_name - Ascii ACPI name to search for |
| 183 | * Node - Starting node where search will begin |
| 184 | * Type - Object type to match |
| 185 | * return_node - Where the matched Node is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | * |
| 187 | * RETURN: Status |
| 188 | * |
| 189 | * DESCRIPTION: Called when a name has not been found in the current namespace |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 190 | * level. Before adding it or giving up, ACPI scope rules require |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | * searching enclosing scopes in cases identified by acpi_ns_local(). |
| 192 | * |
| 193 | * "A name is located by finding the matching name in the current |
| 194 | * name space, and then in the parent name space. If the parent |
| 195 | * name space does not contain the name, the search continues |
| 196 | * recursively until either the name is found or the name space |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 197 | * does not have a parent (the root of the name space). This |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | * indicates that the name is not found" (From ACPI Specification, |
| 199 | * section 5.3) |
| 200 | * |
| 201 | ******************************************************************************/ |
| 202 | |
| 203 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 204 | acpi_ns_search_parent_tree(u32 target_name, |
| 205 | struct acpi_namespace_node *node, |
| 206 | acpi_object_type type, |
| 207 | struct acpi_namespace_node **return_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 209 | acpi_status status; |
| 210 | struct acpi_namespace_node *parent_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 212 | ACPI_FUNCTION_TRACE(ns_search_parent_tree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 214 | parent_node = acpi_ns_get_parent_node(node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | /* |
| 217 | * If there is no parent (i.e., we are at the root) or type is "local", |
| 218 | * we won't be searching the parent tree. |
| 219 | */ |
| 220 | if (!parent_node) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 221 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "[%4.4s] has no parent\n", |
Bob Moore | defba1d | 2005-12-16 17:05:00 -0500 | [diff] [blame] | 222 | ACPI_CAST_PTR(char, &target_name))); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 223 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 226 | if (acpi_ns_local(type)) { |
| 227 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
| 228 | "[%4.4s] type [%s] must be local to this scope (no parent search)\n", |
Bob Moore | defba1d | 2005-12-16 17:05:00 -0500 | [diff] [blame] | 229 | ACPI_CAST_PTR(char, &target_name), |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 230 | acpi_ut_get_type_name(type))); |
| 231 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | /* Search the parent tree */ |
| 235 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 236 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
| 237 | "Searching parent [%4.4s] for [%4.4s]\n", |
| 238 | acpi_ut_get_node_name(parent_node), |
Bob Moore | defba1d | 2005-12-16 17:05:00 -0500 | [diff] [blame] | 239 | ACPI_CAST_PTR(char, &target_name))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
| 241 | /* |
| 242 | * Search parents until target is found or we have backed up to the root |
| 243 | */ |
| 244 | while (parent_node) { |
| 245 | /* |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 246 | * Search parent scope. Use TYPE_ANY because we don't care about the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | * object type at this point, we only care about the existence of |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 248 | * the actual name we are searching for. Typechecking comes later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | */ |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 250 | status = |
| 251 | acpi_ns_search_one_scope(target_name, parent_node, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 252 | ACPI_TYPE_ANY, return_node); |
| 253 | if (ACPI_SUCCESS(status)) { |
| 254 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 257 | /* Not found here, go up another level (until we reach the root) */ |
| 258 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 259 | parent_node = acpi_ns_get_parent_node(parent_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | /* Not found in parent tree */ |
| 263 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 264 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | /******************************************************************************* |
| 268 | * |
| 269 | * FUNCTION: acpi_ns_search_and_enter |
| 270 | * |
| 271 | * PARAMETERS: target_name - Ascii ACPI name to search for (4 chars) |
| 272 | * walk_state - Current state of the walk |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 273 | * Node - Starting node where search will begin |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | * interpreter_mode - Add names only in ACPI_MODE_LOAD_PASS_x. |
| 275 | * Otherwise,search only. |
| 276 | * Type - Object type to match |
| 277 | * Flags - Flags describing the search restrictions |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 278 | * return_node - Where the Node is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | * |
| 280 | * RETURN: Status |
| 281 | * |
| 282 | * DESCRIPTION: Search for a name segment in a single namespace level, |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 283 | * optionally adding it if it is not found. If the passed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | * Type is not Any and the type previously stored in the |
| 285 | * entry was Any (i.e. unknown), update the stored type. |
| 286 | * |
| 287 | * In ACPI_IMODE_EXECUTE, search only. |
| 288 | * In other modes, search and add if not found. |
| 289 | * |
| 290 | ******************************************************************************/ |
| 291 | |
| 292 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 293 | acpi_ns_search_and_enter(u32 target_name, |
| 294 | struct acpi_walk_state *walk_state, |
| 295 | struct acpi_namespace_node *node, |
| 296 | acpi_interpreter_mode interpreter_mode, |
| 297 | acpi_object_type type, |
| 298 | u32 flags, struct acpi_namespace_node **return_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 300 | acpi_status status; |
| 301 | struct acpi_namespace_node *new_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 303 | ACPI_FUNCTION_TRACE(ns_search_and_enter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | /* Parameter validation */ |
| 306 | |
| 307 | if (!node || !target_name || !return_node) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 308 | ACPI_ERROR((AE_INFO, |
Bob Moore | 958dd24 | 2006-05-12 17:12:00 -0400 | [diff] [blame] | 309 | "Null parameter: Node %p Name %X ReturnNode %p", |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 310 | node, target_name, return_node)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 311 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 314 | /* |
| 315 | * Name must consist of valid ACPI characters. We will repair the name if |
| 316 | * necessary because we don't want to abort because of this, but we want |
| 317 | * all namespace names to be printable. A warning message is appropriate. |
| 318 | * |
| 319 | * This issue came up because there are in fact machines that exhibit |
| 320 | * this problem, and we want to be able to enable ACPI support for them, |
| 321 | * even though there are a few bad names. |
| 322 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 323 | if (!acpi_ut_valid_acpi_name(target_name)) { |
Bob Moore | 3d81b23 | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 324 | target_name = |
| 325 | acpi_ut_repair_name(ACPI_CAST_PTR(char, &target_name)); |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 326 | |
| 327 | /* Report warning only if in strict mode or debug mode */ |
| 328 | |
| 329 | if (!acpi_gbl_enable_interpreter_slack) { |
| 330 | ACPI_WARNING((AE_INFO, |
| 331 | "Found bad character(s) in name, repaired: [%4.4s]\n", |
| 332 | ACPI_CAST_PTR(char, &target_name))); |
| 333 | } else { |
| 334 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
| 335 | "Found bad character(s) in name, repaired: [%4.4s]\n", |
| 336 | ACPI_CAST_PTR(char, &target_name))); |
| 337 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | /* Try to find the name in the namespace level specified by the caller */ |
| 341 | |
| 342 | *return_node = ACPI_ENTRY_NOT_FOUND; |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 343 | status = acpi_ns_search_one_scope(target_name, node, type, return_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | if (status != AE_NOT_FOUND) { |
| 345 | /* |
| 346 | * If we found it AND the request specifies that a find is an error, |
| 347 | * return the error |
| 348 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 349 | if ((status == AE_OK) && (flags & ACPI_NS_ERROR_IF_FOUND)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | status = AE_ALREADY_EXISTS; |
| 351 | } |
| 352 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 353 | /* Either found it or there was an error: finished either way */ |
| 354 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 355 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /* |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 359 | * The name was not found. If we are NOT performing the first pass |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | * (name entry) of loading the namespace, search the parent tree (all the |
| 361 | * way to the root if necessary.) We don't want to perform the parent |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 362 | * search when the namespace is actually being loaded. We want to perform |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | * the search when namespace references are being resolved (load pass 2) |
| 364 | * and during the execution phase. |
| 365 | */ |
| 366 | if ((interpreter_mode != ACPI_IMODE_LOAD_PASS1) && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 367 | (flags & ACPI_NS_SEARCH_PARENT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /* |
| 369 | * Not found at this level - search parent tree according to the |
| 370 | * ACPI specification |
| 371 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 372 | status = |
| 373 | acpi_ns_search_parent_tree(target_name, node, type, |
| 374 | return_node); |
| 375 | if (ACPI_SUCCESS(status)) { |
| 376 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | } |
| 379 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 380 | /* In execute mode, just search, never add names. Exit now */ |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | if (interpreter_mode == ACPI_IMODE_EXECUTE) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 383 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
| 384 | "%4.4s Not found in %p [Not adding]\n", |
Bob Moore | defba1d | 2005-12-16 17:05:00 -0500 | [diff] [blame] | 385 | ACPI_CAST_PTR(char, &target_name), node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 387 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | /* Create the new named object */ |
| 391 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 392 | new_node = acpi_ns_create_node(target_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | if (!new_node) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 394 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
Bob Moore | 958dd24 | 2006-05-12 17:12:00 -0400 | [diff] [blame] | 396 | #ifdef ACPI_ASL_COMPILER |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 397 | /* |
| 398 | * Node is an object defined by an External() statement |
| 399 | */ |
Bob Moore | 958dd24 | 2006-05-12 17:12:00 -0400 | [diff] [blame] | 400 | if (flags & ACPI_NS_EXTERNAL) { |
| 401 | new_node->flags |= ANOBJ_IS_EXTERNAL; |
| 402 | } |
| 403 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Bob Moore | d1fdda83 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 405 | if (flags & ACPI_NS_TEMPORARY) { |
| 406 | new_node->flags |= ANOBJ_TEMPORARY; |
| 407 | } |
| 408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | /* Install the new object into the parent's list of children */ |
| 410 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 411 | acpi_ns_install_node(walk_state, node, new_node, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | *return_node = new_node; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 413 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |