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Revert "ACPICA: revert "acpi_serialize" changes"
[linux-2.6.git] / drivers / acpi / namespace / nsinit.c
1 /******************************************************************************
2  *
3  * Module Name: nsinit - namespace initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2007, 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 #include <linux/nmi.h>
49
50 #define _COMPONENT          ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nsinit")
52
53 /* Local prototypes */
54 static acpi_status
55 acpi_ns_init_one_object(acpi_handle obj_handle,
56                         u32 level, void *context, void **return_value);
57
58 static acpi_status
59 acpi_ns_init_one_device(acpi_handle obj_handle,
60                         u32 nesting_level, void *context, void **return_value);
61
62 static acpi_status
63 acpi_ns_find_ini_methods(acpi_handle obj_handle,
64                          u32 nesting_level, void *context, void **return_value);
65
66 /*******************************************************************************
67  *
68  * FUNCTION:    acpi_ns_initialize_objects
69  *
70  * PARAMETERS:  None
71  *
72  * RETURN:      Status
73  *
74  * DESCRIPTION: Walk the entire namespace and perform any necessary
75  *              initialization on the objects found therein
76  *
77  ******************************************************************************/
78
79 acpi_status acpi_ns_initialize_objects(void)
80 {
81         acpi_status status;
82         struct acpi_init_walk_info info;
83
84         ACPI_FUNCTION_TRACE(ns_initialize_objects);
85
86         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
87                           "**** Starting initialization of namespace objects ****\n"));
88         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
89                               "Completing Region/Field/Buffer/Package initialization:"));
90
91         /* Set all init info to zero */
92
93         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
94
95         /* Walk entire namespace from the supplied root */
96
97         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
98                                      ACPI_UINT32_MAX, acpi_ns_init_one_object,
99                                      &info, NULL);
100         if (ACPI_FAILURE(status)) {
101                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
102         }
103
104         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
105                               "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
106                               info.op_region_init, info.op_region_count,
107                               info.field_init, info.field_count,
108                               info.buffer_init, info.buffer_count,
109                               info.package_init, info.package_count,
110                               info.object_count));
111
112         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
113                           "%hd Control Methods found\n", info.method_count));
114         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
115                           "%hd Op Regions found\n", info.op_region_count));
116
117         return_ACPI_STATUS(AE_OK);
118 }
119
120 /*******************************************************************************
121  *
122  * FUNCTION:    acpi_ns_initialize_devices
123  *
124  * PARAMETERS:  None
125  *
126  * RETURN:      acpi_status
127  *
128  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
129  *              This means running _INI on all present devices.
130  *
131  *              Note: We install PCI config space handler on region access,
132  *              not here.
133  *
134  ******************************************************************************/
135
136 acpi_status acpi_ns_initialize_devices(void)
137 {
138         acpi_status status;
139         struct acpi_device_walk_info info;
140
141         ACPI_FUNCTION_TRACE(ns_initialize_devices);
142
143         /* Init counters */
144
145         info.device_count = 0;
146         info.num_STA = 0;
147         info.num_INI = 0;
148
149         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
150                               "Initializing Device/Processor/Thermal objects by executing _INI methods:"));
151
152         /* Tree analysis: find all subtrees that contain _INI methods */
153
154         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
155                                         ACPI_UINT32_MAX, FALSE,
156                                         acpi_ns_find_ini_methods, &info, NULL);
157         if (ACPI_FAILURE(status)) {
158                 goto error_exit;
159         }
160
161         /* Allocate the evaluation information block */
162
163         info.evaluate_info =
164             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
165         if (!info.evaluate_info) {
166                 status = AE_NO_MEMORY;
167                 goto error_exit;
168         }
169
170         /* Walk namespace to execute all _INIs on present devices */
171
172         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
173                                         ACPI_UINT32_MAX, FALSE,
174                                         acpi_ns_init_one_device, &info, NULL);
175
176         ACPI_FREE(info.evaluate_info);
177         if (ACPI_FAILURE(status)) {
178                 goto error_exit;
179         }
180
181         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
182                               "\nExecuted %hd _INI methods requiring %hd _STA executions (examined %hd objects)\n",
183                               info.num_INI, info.num_STA, info.device_count));
184
185         return_ACPI_STATUS(status);
186
187       error_exit:
188         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
189         return_ACPI_STATUS(status);
190 }
191
192 /*******************************************************************************
193  *
194  * FUNCTION:    acpi_ns_init_one_object
195  *
196  * PARAMETERS:  obj_handle      - Node
197  *              Level           - Current nesting level
198  *              Context         - Points to a init info struct
199  *              return_value    - Not used
200  *
201  * RETURN:      Status
202  *
203  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
204  *              within the  namespace.
205  *
206  *              Currently, the only objects that require initialization are:
207  *              1) Methods
208  *              2) Op Regions
209  *
210  ******************************************************************************/
211
212 static acpi_status
213 acpi_ns_init_one_object(acpi_handle obj_handle,
214                         u32 level, void *context, void **return_value)
215 {
216         acpi_object_type type;
217         acpi_status status = AE_OK;
218         struct acpi_init_walk_info *info =
219             (struct acpi_init_walk_info *)context;
220         struct acpi_namespace_node *node =
221             (struct acpi_namespace_node *)obj_handle;
222         union acpi_operand_object *obj_desc;
223
224         ACPI_FUNCTION_NAME(ns_init_one_object);
225
226         info->object_count++;
227
228         /* And even then, we are only interested in a few object types */
229
230         type = acpi_ns_get_type(obj_handle);
231         obj_desc = acpi_ns_get_attached_object(node);
232         if (!obj_desc) {
233                 return (AE_OK);
234         }
235
236         /* Increment counters for object types we are looking for */
237
238         switch (type) {
239         case ACPI_TYPE_REGION:
240                 info->op_region_count++;
241                 break;
242
243         case ACPI_TYPE_BUFFER_FIELD:
244                 info->field_count++;
245                 break;
246
247         case ACPI_TYPE_BUFFER:
248                 info->buffer_count++;
249                 break;
250
251         case ACPI_TYPE_PACKAGE:
252                 info->package_count++;
253                 break;
254
255         default:
256
257                 /* No init required, just exit now */
258                 return (AE_OK);
259         }
260
261         /*
262          * If the object is already initialized, nothing else to do
263          */
264         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
265                 return (AE_OK);
266         }
267
268         /*
269          * Must lock the interpreter before executing AML code
270          */
271         acpi_ex_enter_interpreter();
272
273         /*
274          * Each of these types can contain executable AML code within the
275          * declaration.
276          */
277         switch (type) {
278         case ACPI_TYPE_REGION:
279
280                 info->op_region_init++;
281                 status = acpi_ds_get_region_arguments(obj_desc);
282                 break;
283
284         case ACPI_TYPE_BUFFER_FIELD:
285
286                 info->field_init++;
287                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
288                 break;
289
290         case ACPI_TYPE_BUFFER:
291
292                 info->buffer_init++;
293                 status = acpi_ds_get_buffer_arguments(obj_desc);
294                 break;
295
296         case ACPI_TYPE_PACKAGE:
297
298                 info->package_init++;
299                 status = acpi_ds_get_package_arguments(obj_desc);
300                 break;
301
302         default:
303                 /* No other types can get here */
304                 break;
305         }
306
307         if (ACPI_FAILURE(status)) {
308                 ACPI_EXCEPTION((AE_INFO, status,
309                                 "Could not execute arguments for [%4.4s] (%s)",
310                                 acpi_ut_get_node_name(node),
311                                 acpi_ut_get_type_name(type)));
312         }
313
314         /*
315          * Print a dot for each object unless we are going to print the entire
316          * pathname
317          */
318         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
319                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
320         }
321
322         /*
323          * We ignore errors from above, and always return OK, since we don't want
324          * to abort the walk on any single error.
325          */
326         acpi_ex_exit_interpreter();
327         return (AE_OK);
328 }
329
330 /*******************************************************************************
331  *
332  * FUNCTION:    acpi_ns_find_ini_methods
333  *
334  * PARAMETERS:  acpi_walk_callback
335  *
336  * RETURN:      acpi_status
337  *
338  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
339  *              device/processor/thermal objects, and marks the entire subtree
340  *              with a SUBTREE_HAS_INI flag. This flag is used during the
341  *              subsequent device initialization walk to avoid entire subtrees
342  *              that do not contain an _INI.
343  *
344  ******************************************************************************/
345
346 static acpi_status
347 acpi_ns_find_ini_methods(acpi_handle obj_handle,
348                          u32 nesting_level, void *context, void **return_value)
349 {
350         struct acpi_device_walk_info *info =
351             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
352         struct acpi_namespace_node *node;
353         struct acpi_namespace_node *parent_node;
354
355         /* Keep count of device/processor/thermal objects */
356
357         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
358         if ((node->type == ACPI_TYPE_DEVICE) ||
359             (node->type == ACPI_TYPE_PROCESSOR) ||
360             (node->type == ACPI_TYPE_THERMAL)) {
361                 info->device_count++;
362                 return (AE_OK);
363         }
364
365         /* We are only looking for methods named _INI */
366
367         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
368                 return (AE_OK);
369         }
370
371         /*
372          * The only _INI methods that we care about are those that are
373          * present under Device, Processor, and Thermal objects.
374          */
375         parent_node = acpi_ns_get_parent_node(node);
376         switch (parent_node->type) {
377         case ACPI_TYPE_DEVICE:
378         case ACPI_TYPE_PROCESSOR:
379         case ACPI_TYPE_THERMAL:
380
381                 /* Mark parent and bubble up the INI present flag to the root */
382
383                 while (parent_node) {
384                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
385                         parent_node = acpi_ns_get_parent_node(parent_node);
386                 }
387                 break;
388
389         default:
390                 break;
391         }
392
393         return (AE_OK);
394 }
395
396 /*******************************************************************************
397  *
398  * FUNCTION:    acpi_ns_init_one_device
399  *
400  * PARAMETERS:  acpi_walk_callback
401  *
402  * RETURN:      acpi_status
403  *
404  * DESCRIPTION: This is called once per device soon after ACPI is enabled
405  *              to initialize each device. It determines if the device is
406  *              present, and if so, calls _INI.
407  *
408  ******************************************************************************/
409
410 static acpi_status
411 acpi_ns_init_one_device(acpi_handle obj_handle,
412                         u32 nesting_level, void *context, void **return_value)
413 {
414         struct acpi_device_walk_info *walk_info =
415             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
416         struct acpi_evaluate_info *info = walk_info->evaluate_info;
417         u32 flags;
418         acpi_status status;
419         struct acpi_namespace_node *device_node;
420
421         ACPI_FUNCTION_TRACE(ns_init_one_device);
422
423         /* We are interested in Devices, Processors and thermal_zones only */
424
425         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
426         if ((device_node->type != ACPI_TYPE_DEVICE) &&
427             (device_node->type != ACPI_TYPE_PROCESSOR) &&
428             (device_node->type != ACPI_TYPE_THERMAL)) {
429                 return_ACPI_STATUS(AE_OK);
430         }
431
432         /*
433          * Because of an earlier namespace analysis, all subtrees that contain an
434          * _INI method are tagged.
435          *
436          * If this device subtree does not contain any _INI methods, we
437          * can exit now and stop traversing this entire subtree.
438          */
439         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
440                 return_ACPI_STATUS(AE_CTRL_DEPTH);
441         }
442
443         /*
444          * Run _STA to determine if this device is present and functioning. We
445          * must know this information for two important reasons (from ACPI spec):
446          *
447          * 1) We can only run _INI if the device is present.
448          * 2) We must abort the device tree walk on this subtree if the device is
449          *    not present and is not functional (we will not examine the children)
450          *
451          * The _STA method is not required to be present under the device, we
452          * assume the device is present if _STA does not exist.
453          */
454         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
455                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
456
457         status = acpi_ut_execute_STA(device_node, &flags);
458         if (ACPI_FAILURE(status)) {
459
460                 /* Ignore error and move on to next device */
461
462                 return_ACPI_STATUS(AE_OK);
463         }
464
465         /*
466          * Flags == -1 means that _STA was not found. In this case, we assume that
467          * the device is both present and functional.
468          *
469          * From the ACPI spec, description of _STA:
470          *
471          * "If a device object (including the processor object) does not have an
472          * _STA object, then OSPM assumes that all of the above bits are set (in
473          * other words, the device is present, ..., and functioning)"
474          */
475         if (flags != ACPI_UINT32_MAX) {
476                 walk_info->num_STA++;
477         }
478
479         /*
480          * Examine the PRESENT and FUNCTIONING status bits
481          *
482          * Note: ACPI spec does not seem to specify behavior for the present but
483          * not functioning case, so we assume functioning if present.
484          */
485         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
486
487                 /* Device is not present, we must examine the Functioning bit */
488
489                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
490                         /*
491                          * Device is not present but is "functioning". In this case,
492                          * we will not run _INI, but we continue to examine the children
493                          * of this device.
494                          *
495                          * From the ACPI spec, description of _STA: (Note - no mention
496                          * of whether to run _INI or not on the device in question)
497                          *
498                          * "_STA may return bit 0 clear (not present) with bit 3 set
499                          * (device is functional). This case is used to indicate a valid
500                          * device for which no device driver should be loaded (for example,
501                          * a bridge device.) Children of this device may be present and
502                          * valid. OSPM should continue enumeration below a device whose
503                          * _STA returns this bit combination"
504                          */
505                         return_ACPI_STATUS(AE_OK);
506                 } else {
507                         /*
508                          * Device is not present and is not functioning. We must abort the
509                          * walk of this subtree immediately -- don't look at the children
510                          * of such a device.
511                          *
512                          * From the ACPI spec, description of _INI:
513                          *
514                          * "If the _STA method indicates that the device is not present,
515                          * OSPM will not run the _INI and will not examine the children
516                          * of the device for _INI methods"
517                          */
518                         return_ACPI_STATUS(AE_CTRL_DEPTH);
519                 }
520         }
521
522         /*
523          * The device is present or is assumed present if no _STA exists.
524          * Run the _INI if it exists (not required to exist)
525          *
526          * Note: We know there is an _INI within this subtree, but it may not be
527          * under this particular device, it may be lower in the branch.
528          */
529         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
530                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
531
532         info->prefix_node = device_node;
533         info->pathname = METHOD_NAME__INI;
534         info->parameters = NULL;
535         info->parameter_type = ACPI_PARAM_ARGS;
536         info->flags = ACPI_IGNORE_RETURN_VALUE;
537
538         /*
539          * Some hardware relies on this being executed as atomically
540          * as possible (without an NMI being received in the middle of
541          * this) - so disable NMIs and initialize the device:
542          */
543         acpi_nmi_disable();
544         status = acpi_ns_evaluate(info);
545         acpi_nmi_enable();
546
547         if (ACPI_SUCCESS(status)) {
548                 walk_info->num_INI++;
549
550                 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
551                     (!(acpi_dbg_level & ACPI_LV_INFO))) {
552                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
553                 }
554         }
555 #ifdef ACPI_DEBUG_OUTPUT
556         else if (status != AE_NOT_FOUND) {
557
558                 /* Ignore error and move on to next device */
559
560                 char *scope_name =
561                     acpi_ns_get_external_pathname(info->resolved_node);
562
563                 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
564                                 scope_name));
565                 ACPI_FREE(scope_name);
566         }
567 #endif
568
569         /* Ignore errors from above */
570
571         status = AE_OK;
572
573         /*
574          * The _INI method has been run if present; call the Global Initialization
575          * Handler for this device.
576          */
577         if (acpi_gbl_init_handler) {
578                 status =
579                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
580         }
581
582         return_ACPI_STATUS(status);
583 }