xref: /titanic_41/usr/src/uts/intel/io/acpica/namespace/nsload.c (revision de5d74c22760a6d2cefd94d0e7f0fd87214fb71f)
1 /******************************************************************************
2  *
3  * Module Name: nsload - namespace loading/expanding/contracting procedures
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acnamesp.h"
47 #include "acdispat.h"
48 #include "actables.h"
49 
50 
51 #define _COMPONENT          ACPI_NAMESPACE
52         ACPI_MODULE_NAME    ("nsload")
53 
54 /* Local prototypes */
55 
56 #ifdef ACPI_FUTURE_IMPLEMENTATION
57 ACPI_STATUS
58 AcpiNsUnloadNamespace (
59     ACPI_HANDLE             Handle);
60 
61 static ACPI_STATUS
62 AcpiNsDeleteSubtree (
63     ACPI_HANDLE             StartHandle);
64 #endif
65 
66 
67 #ifndef ACPI_NO_METHOD_EXECUTION
68 /*******************************************************************************
69  *
70  * FUNCTION:    AcpiNsLoadTable
71  *
72  * PARAMETERS:  TableIndex      - Index for table to be loaded
73  *              Node            - Owning NS node
74  *
75  * RETURN:      Status
76  *
77  * DESCRIPTION: Load one ACPI table into the namespace
78  *
79  ******************************************************************************/
80 
81 ACPI_STATUS
AcpiNsLoadTable(UINT32 TableIndex,ACPI_NAMESPACE_NODE * Node)82 AcpiNsLoadTable (
83     UINT32                  TableIndex,
84     ACPI_NAMESPACE_NODE     *Node)
85 {
86     ACPI_STATUS             Status;
87 
88 
89     ACPI_FUNCTION_TRACE (NsLoadTable);
90 
91 
92     /*
93      * Parse the table and load the namespace with all named
94      * objects found within. Control methods are NOT parsed
95      * at this time. In fact, the control methods cannot be
96      * parsed until the entire namespace is loaded, because
97      * if a control method makes a forward reference (call)
98      * to another control method, we can't continue parsing
99      * because we don't know how many arguments to parse next!
100      */
101     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
102     if (ACPI_FAILURE (Status))
103     {
104         return_ACPI_STATUS (Status);
105     }
106 
107     /* If table already loaded into namespace, just return */
108 
109     if (AcpiTbIsTableLoaded (TableIndex))
110     {
111         Status = AE_ALREADY_EXISTS;
112         goto Unlock;
113     }
114 
115     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
116         "**** Loading table into namespace ****\n"));
117 
118     Status = AcpiTbAllocateOwnerId (TableIndex);
119     if (ACPI_FAILURE (Status))
120     {
121         goto Unlock;
122     }
123 
124     Status = AcpiNsParseTable (TableIndex, Node);
125     if (ACPI_SUCCESS (Status))
126     {
127         AcpiTbSetTableLoadedFlag (TableIndex, TRUE);
128     }
129     else
130     {
131         /*
132          * On error, delete any namespace objects created by this table.
133          * We cannot initialize these objects, so delete them. There are
134          * a couple of expecially bad cases:
135          * AE_ALREADY_EXISTS - namespace collision.
136          * AE_NOT_FOUND - the target of a Scope operator does not
137          * exist. This target of Scope must already exist in the
138          * namespace, as per the ACPI specification.
139          */
140         (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
141         AcpiNsDeleteNamespaceByOwner (
142             AcpiGbl_RootTableList.Tables[TableIndex].OwnerId);
143 
144         AcpiTbReleaseOwnerId (TableIndex);
145         return_ACPI_STATUS (Status);
146     }
147 
148 Unlock:
149     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
150 
151     if (ACPI_FAILURE (Status))
152     {
153         return_ACPI_STATUS (Status);
154     }
155 
156     /*
157      * Now we can parse the control methods. We always parse
158      * them here for a sanity check, and if configured for
159      * just-in-time parsing, we delete the control method
160      * parse trees.
161      */
162     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
163         "**** Begin Table Object Initialization\n"));
164 
165     Status = AcpiDsInitializeObjects (TableIndex, Node);
166 
167     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
168         "**** Completed Table Object Initialization\n"));
169 
170     /*
171      * Execute any module-level code that was detected during the table load
172      * phase. Although illegal since ACPI 2.0, there are many machines that
173      * contain this type of code. Each block of detected executable AML code
174      * outside of any control method is wrapped with a temporary control
175      * method object and placed on a global list. The methods on this list
176      * are executed below.
177      *
178      * This case executes the module-level code for each table immediately
179      * after the table has been loaded. This provides compatibility with
180      * other ACPI implementations. Optionally, the execution can be deferred
181      * until later, see AcpiInitializeObjects.
182      */
183     if (!AcpiGbl_GroupModuleLevelCode)
184     {
185         AcpiNsExecModuleCodeList ();
186     }
187 
188     return_ACPI_STATUS (Status);
189 }
190 
191 
192 #ifdef ACPI_OBSOLETE_FUNCTIONS
193 /*******************************************************************************
194  *
195  * FUNCTION:    AcpiLoadNamespace
196  *
197  * PARAMETERS:  None
198  *
199  * RETURN:      Status
200  *
201  * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
202  *              (DSDT points to either the BIOS or a buffer.)
203  *
204  ******************************************************************************/
205 
206 ACPI_STATUS
AcpiNsLoadNamespace(void)207 AcpiNsLoadNamespace (
208     void)
209 {
210     ACPI_STATUS             Status;
211 
212 
213     ACPI_FUNCTION_TRACE (AcpiLoadNameSpace);
214 
215 
216     /* There must be at least a DSDT installed */
217 
218     if (AcpiGbl_DSDT == NULL)
219     {
220         ACPI_ERROR ((AE_INFO, "DSDT is not in memory"));
221         return_ACPI_STATUS (AE_NO_ACPI_TABLES);
222     }
223 
224     /*
225      * Load the namespace. The DSDT is required,
226      * but the SSDT and PSDT tables are optional.
227      */
228     Status = AcpiNsLoadTableByType (ACPI_TABLE_ID_DSDT);
229     if (ACPI_FAILURE (Status))
230     {
231         return_ACPI_STATUS (Status);
232     }
233 
234     /* Ignore exceptions from these */
235 
236     (void) AcpiNsLoadTableByType (ACPI_TABLE_ID_SSDT);
237     (void) AcpiNsLoadTableByType (ACPI_TABLE_ID_PSDT);
238 
239     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
240         "ACPI Namespace successfully loaded at root %p\n",
241         AcpiGbl_RootNode));
242 
243     return_ACPI_STATUS (Status);
244 }
245 #endif
246 
247 #ifdef ACPI_FUTURE_IMPLEMENTATION
248 /*******************************************************************************
249  *
250  * FUNCTION:    AcpiNsDeleteSubtree
251  *
252  * PARAMETERS:  StartHandle         - Handle in namespace where search begins
253  *
254  * RETURNS      Status
255  *
256  * DESCRIPTION: Walks the namespace starting at the given handle and deletes
257  *              all objects, entries, and scopes in the entire subtree.
258  *
259  *              Namespace/Interpreter should be locked or the subsystem should
260  *              be in shutdown before this routine is called.
261  *
262  ******************************************************************************/
263 
264 static ACPI_STATUS
AcpiNsDeleteSubtree(ACPI_HANDLE StartHandle)265 AcpiNsDeleteSubtree (
266     ACPI_HANDLE             StartHandle)
267 {
268     ACPI_STATUS             Status;
269     ACPI_HANDLE             ChildHandle;
270     ACPI_HANDLE             ParentHandle;
271     ACPI_HANDLE             NextChildHandle;
272     ACPI_HANDLE             Dummy;
273     UINT32                  Level;
274 
275 
276     ACPI_FUNCTION_TRACE (NsDeleteSubtree);
277 
278 
279     ParentHandle = StartHandle;
280     ChildHandle = NULL;
281     Level = 1;
282 
283     /*
284      * Traverse the tree of objects until we bubble back up
285      * to where we started.
286      */
287     while (Level > 0)
288     {
289         /* Attempt to get the next object in this scope */
290 
291         Status = AcpiGetNextObject (ACPI_TYPE_ANY, ParentHandle,
292             ChildHandle, &NextChildHandle);
293 
294         ChildHandle = NextChildHandle;
295 
296         /* Did we get a new object? */
297 
298         if (ACPI_SUCCESS (Status))
299         {
300             /* Check if this object has any children */
301 
302             if (ACPI_SUCCESS (AcpiGetNextObject (ACPI_TYPE_ANY, ChildHandle,
303                 NULL, &Dummy)))
304             {
305                 /*
306                  * There is at least one child of this object,
307                  * visit the object
308                  */
309                 Level++;
310                 ParentHandle = ChildHandle;
311                 ChildHandle  = NULL;
312             }
313         }
314         else
315         {
316             /*
317              * No more children in this object, go back up to
318              * the object's parent
319              */
320             Level--;
321 
322             /* Delete all children now */
323 
324             AcpiNsDeleteChildren (ChildHandle);
325 
326             ChildHandle = ParentHandle;
327             Status = AcpiGetParent (ParentHandle, &ParentHandle);
328             if (ACPI_FAILURE (Status))
329             {
330                 return_ACPI_STATUS (Status);
331             }
332         }
333     }
334 
335     /* Now delete the starting object, and we are done */
336 
337     AcpiNsRemoveNode (ChildHandle);
338     return_ACPI_STATUS (AE_OK);
339 }
340 
341 
342 /*******************************************************************************
343  *
344  *  FUNCTION:       AcpiNsUnloadNameSpace
345  *
346  *  PARAMETERS:     Handle          - Root of namespace subtree to be deleted
347  *
348  *  RETURN:         Status
349  *
350  *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
351  *                  event. Deletes an entire subtree starting from (and
352  *                  including) the given handle.
353  *
354  ******************************************************************************/
355 
356 ACPI_STATUS
AcpiNsUnloadNamespace(ACPI_HANDLE Handle)357 AcpiNsUnloadNamespace (
358     ACPI_HANDLE             Handle)
359 {
360     ACPI_STATUS             Status;
361 
362 
363     ACPI_FUNCTION_TRACE (NsUnloadNameSpace);
364 
365 
366     /* Parameter validation */
367 
368     if (!AcpiGbl_RootNode)
369     {
370         return_ACPI_STATUS (AE_NO_NAMESPACE);
371     }
372 
373     if (!Handle)
374     {
375         return_ACPI_STATUS (AE_BAD_PARAMETER);
376     }
377 
378     /* This function does the real work */
379 
380     Status = AcpiNsDeleteSubtree (Handle);
381     return_ACPI_STATUS (Status);
382 }
383 #endif
384 #endif
385