[SCSI] aacraid: sa race condition fix
[linux-2.6] / drivers / acpi / namespace / nsinit.c
1 /******************************************************************************
2  *
3  * Module Name: nsinit - namespace initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2006, 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_EXCEPTION((AE_INFO, status, "During walk_namespace"));
97         }
98
99         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
100                               "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
101                               info.op_region_init, info.op_region_count,
102                               info.field_init, info.field_count,
103                               info.buffer_init, info.buffer_count,
104                               info.package_init, info.package_count,
105                               info.object_count));
106
107         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
108                           "%hd Control Methods found\n", info.method_count));
109         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
110                           "%hd Op Regions found\n", info.op_region_count));
111
112         return_ACPI_STATUS(AE_OK);
113 }
114
115 /*******************************************************************************
116  *
117  * FUNCTION:    acpi_ns_initialize_devices
118  *
119  * PARAMETERS:  None
120  *
121  * RETURN:      acpi_status
122  *
123  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
124  *              This means running _INI on all present devices.
125  *
126  *              Note: We install PCI config space handler on region access,
127  *              not here.
128  *
129  ******************************************************************************/
130
131 acpi_status acpi_ns_initialize_devices(void)
132 {
133         acpi_status status;
134         struct acpi_device_walk_info info;
135
136         ACPI_FUNCTION_TRACE("ns_initialize_devices");
137
138         /* Init counters */
139
140         info.device_count = 0;
141         info.num_STA = 0;
142         info.num_INI = 0;
143
144         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
145                               "Executing all Device _STA and_INI methods:"));
146
147         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
148         if (ACPI_FAILURE(status)) {
149                 return_ACPI_STATUS(status);
150         }
151
152         /* Walk namespace for all objects */
153
154         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
155                                         ACPI_UINT32_MAX, TRUE,
156                                         acpi_ns_init_one_device, &info, NULL);
157
158         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
159
160         if (ACPI_FAILURE(status)) {
161                 ACPI_EXCEPTION((AE_INFO, status, "During walk_namespace"));
162         }
163
164         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
165                               "\n%hd Devices found - executed %hd _STA, %hd _INI methods\n",
166                               info.device_count, info.num_STA, info.num_INI));
167
168         return_ACPI_STATUS(status);
169 }
170
171 /*******************************************************************************
172  *
173  * FUNCTION:    acpi_ns_init_one_object
174  *
175  * PARAMETERS:  obj_handle      - Node
176  *              Level           - Current nesting level
177  *              Context         - Points to a init info struct
178  *              return_value    - Not used
179  *
180  * RETURN:      Status
181  *
182  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
183  *              within the  namespace.
184  *
185  *              Currently, the only objects that require initialization are:
186  *              1) Methods
187  *              2) Op Regions
188  *
189  ******************************************************************************/
190
191 static acpi_status
192 acpi_ns_init_one_object(acpi_handle obj_handle,
193                         u32 level, void *context, void **return_value)
194 {
195         acpi_object_type type;
196         acpi_status status;
197         struct acpi_init_walk_info *info =
198             (struct acpi_init_walk_info *)context;
199         struct acpi_namespace_node *node =
200             (struct acpi_namespace_node *)obj_handle;
201         union acpi_operand_object *obj_desc;
202
203         ACPI_FUNCTION_NAME("ns_init_one_object");
204
205         info->object_count++;
206
207         /* And even then, we are only interested in a few object types */
208
209         type = acpi_ns_get_type(obj_handle);
210         obj_desc = acpi_ns_get_attached_object(node);
211         if (!obj_desc) {
212                 return (AE_OK);
213         }
214
215         /* Increment counters for object types we are looking for */
216
217         switch (type) {
218         case ACPI_TYPE_REGION:
219                 info->op_region_count++;
220                 break;
221
222         case ACPI_TYPE_BUFFER_FIELD:
223                 info->field_count++;
224                 break;
225
226         case ACPI_TYPE_BUFFER:
227                 info->buffer_count++;
228                 break;
229
230         case ACPI_TYPE_PACKAGE:
231                 info->package_count++;
232                 break;
233
234         default:
235
236                 /* No init required, just exit now */
237                 return (AE_OK);
238         }
239
240         /*
241          * If the object is already initialized, nothing else to do
242          */
243         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
244                 return (AE_OK);
245         }
246
247         /*
248          * Must lock the interpreter before executing AML code
249          */
250         status = acpi_ex_enter_interpreter();
251         if (ACPI_FAILURE(status)) {
252                 return (status);
253         }
254
255         /*
256          * Each of these types can contain executable AML code within the
257          * declaration.
258          */
259         switch (type) {
260         case ACPI_TYPE_REGION:
261
262                 info->op_region_init++;
263                 status = acpi_ds_get_region_arguments(obj_desc);
264                 break;
265
266         case ACPI_TYPE_BUFFER_FIELD:
267
268                 info->field_init++;
269                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
270                 break;
271
272         case ACPI_TYPE_BUFFER:
273
274                 info->buffer_init++;
275                 status = acpi_ds_get_buffer_arguments(obj_desc);
276                 break;
277
278         case ACPI_TYPE_PACKAGE:
279
280                 info->package_init++;
281                 status = acpi_ds_get_package_arguments(obj_desc);
282                 break;
283
284         default:
285                 /* No other types can get here */
286                 break;
287         }
288
289         if (ACPI_FAILURE(status)) {
290                 ACPI_EXCEPTION((AE_INFO, status,
291                                 "Could not execute arguments for [%4.4s] (%s)",
292                                 acpi_ut_get_node_name(node),
293                                 acpi_ut_get_type_name(type)));
294         }
295
296         /*
297          * Print a dot for each object unless we are going to print the entire
298          * pathname
299          */
300         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
301                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
302         }
303
304         /*
305          * We ignore errors from above, and always return OK, since we don't want
306          * to abort the walk on any single error.
307          */
308         acpi_ex_exit_interpreter();
309         return (AE_OK);
310 }
311
312 /*******************************************************************************
313  *
314  * FUNCTION:    acpi_ns_init_one_device
315  *
316  * PARAMETERS:  acpi_walk_callback
317  *
318  * RETURN:      acpi_status
319  *
320  * DESCRIPTION: This is called once per device soon after ACPI is enabled
321  *              to initialize each device. It determines if the device is
322  *              present, and if so, calls _INI.
323  *
324  ******************************************************************************/
325
326 static acpi_status
327 acpi_ns_init_one_device(acpi_handle obj_handle,
328                         u32 nesting_level, void *context, void **return_value)
329 {
330         struct acpi_device_walk_info *info =
331             (struct acpi_device_walk_info *)context;
332         struct acpi_parameter_info pinfo;
333         u32 flags;
334         acpi_status status;
335         struct acpi_namespace_node *ini_node;
336         struct acpi_namespace_node *device_node;
337
338         ACPI_FUNCTION_TRACE("ns_init_one_device");
339
340         device_node = acpi_ns_map_handle_to_node(obj_handle);
341         if (!device_node) {
342                 return_ACPI_STATUS(AE_BAD_PARAMETER);
343         }
344
345         /*
346          * We will run _STA/_INI on Devices, Processors and thermal_zones only
347          */
348         if ((device_node->type != ACPI_TYPE_DEVICE) &&
349             (device_node->type != ACPI_TYPE_PROCESSOR) &&
350             (device_node->type != ACPI_TYPE_THERMAL)) {
351                 return_ACPI_STATUS(AE_OK);
352         }
353
354         if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
355             (!(acpi_dbg_level & ACPI_LV_INFO))) {
356                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
357         }
358
359         info->device_count++;
360
361         /*
362          * Check if the _INI method exists for this device -
363          * if _INI does not exist, there is no need to run _STA
364          * No _INI means device requires no initialization
365          */
366         status = acpi_ns_search_node(*ACPI_CAST_PTR(u32, METHOD_NAME__INI),
367                                      device_node, ACPI_TYPE_METHOD, &ini_node);
368         if (ACPI_FAILURE(status)) {
369                 /* No _INI method found - move on to next device */
370
371                 return_ACPI_STATUS(AE_OK);
372         }
373
374         /*
375          * Run _STA to determine if we can run _INI on the device -
376          * the device must be present before _INI can be run.
377          * However, _STA is not required - assume device present if no _STA
378          */
379         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_METHOD,
380                                                       device_node,
381                                                       METHOD_NAME__STA));
382
383         pinfo.node = device_node;
384         pinfo.parameters = NULL;
385         pinfo.parameter_type = ACPI_PARAM_ARGS;
386
387         status = acpi_ut_execute_STA(pinfo.node, &flags);
388         if (ACPI_FAILURE(status)) {
389                 /* Ignore error and move on to next device */
390
391                 return_ACPI_STATUS(AE_OK);
392         }
393
394         if (flags != ACPI_UINT32_MAX) {
395                 info->num_STA++;
396         }
397
398         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
399                 /* Don't look at children of a not present device */
400
401                 return_ACPI_STATUS(AE_CTRL_DEPTH);
402         }
403
404         /*
405          * The device is present and _INI exists. Run the _INI method.
406          * (We already have the _INI node from above)
407          */
408         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_METHOD,
409                                                       pinfo.node,
410                                                       METHOD_NAME__INI));
411
412         pinfo.node = ini_node;
413         status = acpi_ns_evaluate_by_handle(&pinfo);
414         if (ACPI_FAILURE(status)) {
415                 /* Ignore error and move on to next device */
416
417 #ifdef ACPI_DEBUG_OUTPUT
418                 char *scope_name = acpi_ns_get_external_pathname(ini_node);
419
420                 ACPI_WARNING((AE_INFO, "%s._INI failed: %s",
421                               scope_name, acpi_format_exception(status)));
422
423                 ACPI_MEM_FREE(scope_name);
424 #endif
425         } else {
426                 /* Delete any return object (especially if implicit_return is enabled) */
427
428                 if (pinfo.return_object) {
429                         acpi_ut_remove_reference(pinfo.return_object);
430                 }
431
432                 /* Count of successful INIs */
433
434                 info->num_INI++;
435         }
436
437         if (acpi_gbl_init_handler) {
438                 /* External initialization handler is present, call it */
439
440                 status =
441                     acpi_gbl_init_handler(pinfo.node, ACPI_INIT_DEVICE_INI);
442         }
443
444         return_ACPI_STATUS(AE_OK);
445 }