Merge from-linus to-akpm
[linux-2.6] / drivers / acpi / namespace / nsinit.c
1 /******************************************************************************
2  *
3  * Module Name: nsinit - namespace initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2005, R. Byron Moore
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43
44 #include <acpi/acpi.h>
45 #include <acpi/acnamesp.h>
46 #include <acpi/acdispat.h>
47 #include <acpi/acinterp.h>
48
49 #define _COMPONENT          ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsinit")
51
52 /* Local prototypes */
53 static acpi_status
54 acpi_ns_init_one_object(acpi_handle obj_handle,
55                         u32 level, void *context, void **return_value);
56
57 static acpi_status
58 acpi_ns_init_one_device(acpi_handle obj_handle,
59                         u32 nesting_level, void *context, void **return_value);
60
61 /*******************************************************************************
62  *
63  * FUNCTION:    acpi_ns_initialize_objects
64  *
65  * PARAMETERS:  None
66  *
67  * RETURN:      Status
68  *
69  * DESCRIPTION: Walk the entire namespace and perform any necessary
70  *              initialization on the objects found therein
71  *
72  ******************************************************************************/
73
74 acpi_status acpi_ns_initialize_objects(void)
75 {
76         acpi_status status;
77         struct acpi_init_walk_info info;
78
79         ACPI_FUNCTION_TRACE("ns_initialize_objects");
80
81         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
82                           "**** Starting initialization of namespace objects ****\n"));
83         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
84                               "Completing Region/Field/Buffer/Package initialization:"));
85
86         /* Set all init info to zero */
87
88         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
89
90         /* Walk entire namespace from the supplied root */
91
92         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
93                                      ACPI_UINT32_MAX, acpi_ns_init_one_object,
94                                      &info, NULL);
95         if (ACPI_FAILURE(status)) {
96                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed! %s\n",
97                                   acpi_format_exception(status)));
98         }
99
100         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
101                               "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
102                               info.op_region_init, info.op_region_count,
103                               info.field_init, info.field_count,
104                               info.buffer_init, info.buffer_count,
105                               info.package_init, info.package_count,
106                               info.object_count));
107
108         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
109                           "%hd Control Methods found\n", info.method_count));
110         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
111                           "%hd Op Regions found\n", info.op_region_count));
112
113         return_ACPI_STATUS(AE_OK);
114 }
115
116 /*******************************************************************************
117  *
118  * FUNCTION:    acpi_ns_initialize_devices
119  *
120  * PARAMETERS:  None
121  *
122  * RETURN:      acpi_status
123  *
124  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
125  *              This means running _INI on all present devices.
126  *
127  *              Note: We install PCI config space handler on region access,
128  *              not here.
129  *
130  ******************************************************************************/
131
132 acpi_status acpi_ns_initialize_devices(void)
133 {
134         acpi_status status;
135         struct acpi_device_walk_info info;
136
137         ACPI_FUNCTION_TRACE("ns_initialize_devices");
138
139         /* Init counters */
140
141         info.device_count = 0;
142         info.num_STA = 0;
143         info.num_INI = 0;
144
145         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
146                               "Executing all Device _STA and_INI methods:"));
147
148         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
149         if (ACPI_FAILURE(status)) {
150                 return_ACPI_STATUS(status);
151         }
152
153         /* Walk namespace for all objects */
154
155         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
156                                         ACPI_UINT32_MAX, TRUE,
157                                         acpi_ns_init_one_device, &info, NULL);
158
159         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
160
161         if (ACPI_FAILURE(status)) {
162                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed! %s\n",
163                                   acpi_format_exception(status)));
164         }
165
166         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
167                               "\n%hd Devices found containing: %hd _STA, %hd _INI methods\n",
168                               info.device_count, info.num_STA, info.num_INI));
169
170         return_ACPI_STATUS(status);
171 }
172
173 /*******************************************************************************
174  *
175  * FUNCTION:    acpi_ns_init_one_object
176  *
177  * PARAMETERS:  obj_handle      - Node
178  *              Level           - Current nesting level
179  *              Context         - Points to a init info struct
180  *              return_value    - Not used
181  *
182  * RETURN:      Status
183  *
184  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
185  *              within the  namespace.
186  *
187  *              Currently, the only objects that require initialization are:
188  *              1) Methods
189  *              2) Op Regions
190  *
191  ******************************************************************************/
192
193 static acpi_status
194 acpi_ns_init_one_object(acpi_handle obj_handle,
195                         u32 level, void *context, void **return_value)
196 {
197         acpi_object_type type;
198         acpi_status status;
199         struct acpi_init_walk_info *info =
200             (struct acpi_init_walk_info *)context;
201         struct acpi_namespace_node *node =
202             (struct acpi_namespace_node *)obj_handle;
203         union acpi_operand_object *obj_desc;
204
205         ACPI_FUNCTION_NAME("ns_init_one_object");
206
207         info->object_count++;
208
209         /* And even then, we are only interested in a few object types */
210
211         type = acpi_ns_get_type(obj_handle);
212         obj_desc = acpi_ns_get_attached_object(node);
213         if (!obj_desc) {
214                 return (AE_OK);
215         }
216
217         /* Increment counters for object types we are looking for */
218
219         switch (type) {
220         case ACPI_TYPE_REGION:
221                 info->op_region_count++;
222                 break;
223
224         case ACPI_TYPE_BUFFER_FIELD:
225                 info->field_count++;
226                 break;
227
228         case ACPI_TYPE_BUFFER:
229                 info->buffer_count++;
230                 break;
231
232         case ACPI_TYPE_PACKAGE:
233                 info->package_count++;
234                 break;
235
236         default:
237
238                 /* No init required, just exit now */
239                 return (AE_OK);
240         }
241
242         /*
243          * If the object is already initialized, nothing else to do
244          */
245         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
246                 return (AE_OK);
247         }
248
249         /*
250          * Must lock the interpreter before executing AML code
251          */
252         status = acpi_ex_enter_interpreter();
253         if (ACPI_FAILURE(status)) {
254                 return (status);
255         }
256
257         /*
258          * Each of these types can contain executable AML code within the
259          * declaration.
260          */
261         switch (type) {
262         case ACPI_TYPE_REGION:
263
264                 info->op_region_init++;
265                 status = acpi_ds_get_region_arguments(obj_desc);
266                 break;
267
268         case ACPI_TYPE_BUFFER_FIELD:
269
270                 info->field_init++;
271                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
272                 break;
273
274         case ACPI_TYPE_BUFFER:
275
276                 info->buffer_init++;
277                 status = acpi_ds_get_buffer_arguments(obj_desc);
278                 break;
279
280         case ACPI_TYPE_PACKAGE:
281
282                 info->package_init++;
283                 status = acpi_ds_get_package_arguments(obj_desc);
284                 break;
285
286         default:
287                 /* No other types can get here */
288                 break;
289         }
290
291         if (ACPI_FAILURE(status)) {
292                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_ERROR, "\n"));
293                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
294                                   "Could not execute arguments for [%4.4s] (%s), %s\n",
295                                   acpi_ut_get_node_name(node),
296                                   acpi_ut_get_type_name(type),
297                                   acpi_format_exception(status)));
298         }
299
300         /*
301          * Print a dot for each object unless we are going to print the entire
302          * pathname
303          */
304         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
305                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
306         }
307
308         /*
309          * We ignore errors from above, and always return OK, since we don't want
310          * to abort the walk on any single error.
311          */
312         acpi_ex_exit_interpreter();
313         return (AE_OK);
314 }
315
316 /*******************************************************************************
317  *
318  * FUNCTION:    acpi_ns_init_one_device
319  *
320  * PARAMETERS:  acpi_walk_callback
321  *
322  * RETURN:      acpi_status
323  *
324  * DESCRIPTION: This is called once per device soon after ACPI is enabled
325  *              to initialize each device. It determines if the device is
326  *              present, and if so, calls _INI.
327  *
328  ******************************************************************************/
329
330 static acpi_status
331 acpi_ns_init_one_device(acpi_handle obj_handle,
332                         u32 nesting_level, void *context, void **return_value)
333 {
334         struct acpi_device_walk_info *info =
335             (struct acpi_device_walk_info *)context;
336         struct acpi_parameter_info pinfo;
337         u32 flags;
338         acpi_status status;
339
340         ACPI_FUNCTION_TRACE("ns_init_one_device");
341
342         pinfo.parameters = NULL;
343         pinfo.parameter_type = ACPI_PARAM_ARGS;
344
345         pinfo.node = acpi_ns_map_handle_to_node(obj_handle);
346         if (!pinfo.node) {
347                 return_ACPI_STATUS(AE_BAD_PARAMETER);
348         }
349
350         /*
351          * We will run _STA/_INI on Devices, Processors and thermal_zones only
352          */
353         if ((pinfo.node->type != ACPI_TYPE_DEVICE) &&
354             (pinfo.node->type != ACPI_TYPE_PROCESSOR) &&
355             (pinfo.node->type != ACPI_TYPE_THERMAL)) {
356                 return_ACPI_STATUS(AE_OK);
357         }
358
359         if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
360             (!(acpi_dbg_level & ACPI_LV_INFO))) {
361                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
362         }
363
364         info->device_count++;
365
366         /*
367          * Run _STA to determine if we can run _INI on the device.
368          */
369         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_METHOD,
370                                                       pinfo.node,
371                                                       METHOD_NAME__STA));
372         status = acpi_ut_execute_STA(pinfo.node, &flags);
373
374         if (ACPI_FAILURE(status)) {
375                 if (pinfo.node->type == ACPI_TYPE_DEVICE) {
376                         /* Ignore error and move on to next device */
377
378                         return_ACPI_STATUS(AE_OK);
379                 }
380
381                 /* _STA is not required for Processor or thermal_zone objects */
382         } else {
383                 info->num_STA++;
384
385                 if (!(flags & 0x01)) {
386                         /* Don't look at children of a not present device */
387
388                         return_ACPI_STATUS(AE_CTRL_DEPTH);
389                 }
390         }
391
392         /*
393          * The device is present. Run _INI.
394          */
395         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_METHOD,
396                                                       pinfo.node,
397                                                       METHOD_NAME__INI));
398         status = acpi_ns_evaluate_relative(METHOD_NAME__INI, &pinfo);
399         if (ACPI_FAILURE(status)) {
400                 /* No _INI (AE_NOT_FOUND) means device requires no initialization */
401
402                 if (status != AE_NOT_FOUND) {
403                         /* Ignore error and move on to next device */
404
405 #ifdef ACPI_DEBUG_OUTPUT
406                         char *scope_name =
407                             acpi_ns_get_external_pathname(pinfo.node);
408
409                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "%s._INI failed: %s\n",
410                                           scope_name,
411                                           acpi_format_exception(status)));
412
413                         ACPI_MEM_FREE(scope_name);
414 #endif
415                 }
416
417                 status = AE_OK;
418         } else {
419                 /* Delete any return object (especially if implicit_return is enabled) */
420
421                 if (pinfo.return_object) {
422                         acpi_ut_remove_reference(pinfo.return_object);
423                 }
424
425                 /* Count of successful INIs */
426
427                 info->num_INI++;
428         }
429
430         if (acpi_gbl_init_handler) {
431                 /* External initialization handler is present, call it */
432
433                 status =
434                     acpi_gbl_init_handler(pinfo.node, ACPI_INIT_DEVICE_INI);
435         }
436
437         return_ACPI_STATUS(status);
438 }