Merge branch 'linux-2.6.30.y' of git://git.kernel.org/pub/scm/linux/kernel/git/inaky...
[linux-2.6] / drivers / acpi / acpica / nsinit.c
1 /******************************************************************************
2  *
3  * Module Name: nsinit - namespace initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2008, 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/acpi.h>
45 #include "accommon.h"
46 #include "acnamesp.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include <linux/nmi.h>
50
51 #define _COMPONENT          ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsinit")
53
54 /* Local prototypes */
55 static acpi_status
56 acpi_ns_init_one_object(acpi_handle obj_handle,
57                         u32 level, void *context, void **return_value);
58
59 static acpi_status
60 acpi_ns_init_one_device(acpi_handle obj_handle,
61                         u32 nesting_level, void *context, void **return_value);
62
63 static acpi_status
64 acpi_ns_find_ini_methods(acpi_handle obj_handle,
65                          u32 nesting_level, void *context, void **return_value);
66
67 /*******************************************************************************
68  *
69  * FUNCTION:    acpi_ns_initialize_objects
70  *
71  * PARAMETERS:  None
72  *
73  * RETURN:      Status
74  *
75  * DESCRIPTION: Walk the entire namespace and perform any necessary
76  *              initialization on the objects found therein
77  *
78  ******************************************************************************/
79
80 acpi_status acpi_ns_initialize_objects(void)
81 {
82         acpi_status status;
83         struct acpi_init_walk_info info;
84
85         ACPI_FUNCTION_TRACE(ns_initialize_objects);
86
87         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
88                           "**** Starting initialization of namespace objects ****\n"));
89         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
90                               "Completing Region/Field/Buffer/Package initialization:"));
91
92         /* Set all init info to zero */
93
94         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
95
96         /* Walk entire namespace from the supplied root */
97
98         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
99                                      ACPI_UINT32_MAX, acpi_ns_init_one_object,
100                                      &info, NULL);
101         if (ACPI_FAILURE(status)) {
102                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
103         }
104
105         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
106                               "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd "
107                               "Buffers %hd/%hd Packages (%hd nodes)\n",
108                               info.op_region_init, info.op_region_count,
109                               info.field_init, info.field_count,
110                               info.buffer_init, info.buffer_count,
111                               info.package_init, info.package_count,
112                               info.object_count));
113
114         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
115                           "%hd Control Methods found\n", info.method_count));
116         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
117                           "%hd Op Regions found\n", info.op_region_count));
118
119         return_ACPI_STATUS(AE_OK);
120 }
121
122 /*******************************************************************************
123  *
124  * FUNCTION:    acpi_ns_initialize_devices
125  *
126  * PARAMETERS:  None
127  *
128  * RETURN:      acpi_status
129  *
130  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
131  *              This means running _INI on all present devices.
132  *
133  *              Note: We install PCI config space handler on region access,
134  *              not here.
135  *
136  ******************************************************************************/
137
138 acpi_status acpi_ns_initialize_devices(void)
139 {
140         acpi_status status;
141         struct acpi_device_walk_info info;
142
143         ACPI_FUNCTION_TRACE(ns_initialize_devices);
144
145         /* Init counters */
146
147         info.device_count = 0;
148         info.num_STA = 0;
149         info.num_INI = 0;
150
151         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
152                               "Initializing Device/Processor/Thermal objects "
153                               "by executing _INI methods:"));
154
155         /* Tree analysis: find all subtrees that contain _INI methods */
156
157         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
158                                         ACPI_UINT32_MAX, FALSE,
159                                         acpi_ns_find_ini_methods, &info, NULL);
160         if (ACPI_FAILURE(status)) {
161                 goto error_exit;
162         }
163
164         /* Allocate the evaluation information block */
165
166         info.evaluate_info =
167             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
168         if (!info.evaluate_info) {
169                 status = AE_NO_MEMORY;
170                 goto error_exit;
171         }
172
173         /* Walk namespace to execute all _INIs on present devices */
174
175         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
176                                         ACPI_UINT32_MAX, FALSE,
177                                         acpi_ns_init_one_device, &info, NULL);
178
179         ACPI_FREE(info.evaluate_info);
180         if (ACPI_FAILURE(status)) {
181                 goto error_exit;
182         }
183
184         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
185                               "\nExecuted %hd _INI methods requiring %hd _STA executions "
186                               "(examined %hd objects)\n",
187                               info.num_INI, info.num_STA, info.device_count));
188
189         return_ACPI_STATUS(status);
190
191       error_exit:
192         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
193         return_ACPI_STATUS(status);
194 }
195
196 /*******************************************************************************
197  *
198  * FUNCTION:    acpi_ns_init_one_object
199  *
200  * PARAMETERS:  obj_handle      - Node
201  *              Level           - Current nesting level
202  *              Context         - Points to a init info struct
203  *              return_value    - Not used
204  *
205  * RETURN:      Status
206  *
207  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
208  *              within the  namespace.
209  *
210  *              Currently, the only objects that require initialization are:
211  *              1) Methods
212  *              2) Op Regions
213  *
214  ******************************************************************************/
215
216 static acpi_status
217 acpi_ns_init_one_object(acpi_handle obj_handle,
218                         u32 level, void *context, void **return_value)
219 {
220         acpi_object_type type;
221         acpi_status status = AE_OK;
222         struct acpi_init_walk_info *info =
223             (struct acpi_init_walk_info *)context;
224         struct acpi_namespace_node *node =
225             (struct acpi_namespace_node *)obj_handle;
226         union acpi_operand_object *obj_desc;
227
228         ACPI_FUNCTION_NAME(ns_init_one_object);
229
230         info->object_count++;
231
232         /* And even then, we are only interested in a few object types */
233
234         type = acpi_ns_get_type(obj_handle);
235         obj_desc = acpi_ns_get_attached_object(node);
236         if (!obj_desc) {
237                 return (AE_OK);
238         }
239
240         /* Increment counters for object types we are looking for */
241
242         switch (type) {
243         case ACPI_TYPE_REGION:
244                 info->op_region_count++;
245                 break;
246
247         case ACPI_TYPE_BUFFER_FIELD:
248                 info->field_count++;
249                 break;
250
251         case ACPI_TYPE_LOCAL_BANK_FIELD:
252                 info->field_count++;
253                 break;
254
255         case ACPI_TYPE_BUFFER:
256                 info->buffer_count++;
257                 break;
258
259         case ACPI_TYPE_PACKAGE:
260                 info->package_count++;
261                 break;
262
263         default:
264
265                 /* No init required, just exit now */
266                 return (AE_OK);
267         }
268
269         /* If the object is already initialized, nothing else to do */
270
271         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
272                 return (AE_OK);
273         }
274
275         /* Must lock the interpreter before executing AML code */
276
277         acpi_ex_enter_interpreter();
278
279         /*
280          * Each of these types can contain executable AML code within the
281          * declaration.
282          */
283         switch (type) {
284         case ACPI_TYPE_REGION:
285
286                 info->op_region_init++;
287                 status = acpi_ds_get_region_arguments(obj_desc);
288                 break;
289
290         case ACPI_TYPE_BUFFER_FIELD:
291
292                 info->field_init++;
293                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
294                 break;
295
296         case ACPI_TYPE_LOCAL_BANK_FIELD:
297
298                 info->field_init++;
299                 status = acpi_ds_get_bank_field_arguments(obj_desc);
300                 break;
301
302         case ACPI_TYPE_BUFFER:
303
304                 info->buffer_init++;
305                 status = acpi_ds_get_buffer_arguments(obj_desc);
306                 break;
307
308         case ACPI_TYPE_PACKAGE:
309
310                 info->package_init++;
311                 status = acpi_ds_get_package_arguments(obj_desc);
312                 break;
313
314         default:
315                 /* No other types can get here */
316                 break;
317         }
318
319         if (ACPI_FAILURE(status)) {
320                 ACPI_EXCEPTION((AE_INFO, status,
321                                 "Could not execute arguments for [%4.4s] (%s)",
322                                 acpi_ut_get_node_name(node),
323                                 acpi_ut_get_type_name(type)));
324         }
325
326         /*
327          * Print a dot for each object unless we are going to print the entire
328          * pathname
329          */
330         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
331                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
332         }
333
334         /*
335          * We ignore errors from above, and always return OK, since we don't want
336          * to abort the walk on any single error.
337          */
338         acpi_ex_exit_interpreter();
339         return (AE_OK);
340 }
341
342 /*******************************************************************************
343  *
344  * FUNCTION:    acpi_ns_find_ini_methods
345  *
346  * PARAMETERS:  acpi_walk_callback
347  *
348  * RETURN:      acpi_status
349  *
350  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
351  *              device/processor/thermal objects, and marks the entire subtree
352  *              with a SUBTREE_HAS_INI flag. This flag is used during the
353  *              subsequent device initialization walk to avoid entire subtrees
354  *              that do not contain an _INI.
355  *
356  ******************************************************************************/
357
358 static acpi_status
359 acpi_ns_find_ini_methods(acpi_handle obj_handle,
360                          u32 nesting_level, void *context, void **return_value)
361 {
362         struct acpi_device_walk_info *info =
363             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
364         struct acpi_namespace_node *node;
365         struct acpi_namespace_node *parent_node;
366
367         /* Keep count of device/processor/thermal objects */
368
369         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
370         if ((node->type == ACPI_TYPE_DEVICE) ||
371             (node->type == ACPI_TYPE_PROCESSOR) ||
372             (node->type == ACPI_TYPE_THERMAL)) {
373                 info->device_count++;
374                 return (AE_OK);
375         }
376
377         /* We are only looking for methods named _INI */
378
379         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
380                 return (AE_OK);
381         }
382
383         /*
384          * The only _INI methods that we care about are those that are
385          * present under Device, Processor, and Thermal objects.
386          */
387         parent_node = acpi_ns_get_parent_node(node);
388         switch (parent_node->type) {
389         case ACPI_TYPE_DEVICE:
390         case ACPI_TYPE_PROCESSOR:
391         case ACPI_TYPE_THERMAL:
392
393                 /* Mark parent and bubble up the INI present flag to the root */
394
395                 while (parent_node) {
396                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
397                         parent_node = acpi_ns_get_parent_node(parent_node);
398                 }
399                 break;
400
401         default:
402                 break;
403         }
404
405         return (AE_OK);
406 }
407
408 /*******************************************************************************
409  *
410  * FUNCTION:    acpi_ns_init_one_device
411  *
412  * PARAMETERS:  acpi_walk_callback
413  *
414  * RETURN:      acpi_status
415  *
416  * DESCRIPTION: This is called once per device soon after ACPI is enabled
417  *              to initialize each device. It determines if the device is
418  *              present, and if so, calls _INI.
419  *
420  ******************************************************************************/
421
422 static acpi_status
423 acpi_ns_init_one_device(acpi_handle obj_handle,
424                         u32 nesting_level, void *context, void **return_value)
425 {
426         struct acpi_device_walk_info *walk_info =
427             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
428         struct acpi_evaluate_info *info = walk_info->evaluate_info;
429         u32 flags;
430         acpi_status status;
431         struct acpi_namespace_node *device_node;
432
433         ACPI_FUNCTION_TRACE(ns_init_one_device);
434
435         /* We are interested in Devices, Processors and thermal_zones only */
436
437         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
438         if ((device_node->type != ACPI_TYPE_DEVICE) &&
439             (device_node->type != ACPI_TYPE_PROCESSOR) &&
440             (device_node->type != ACPI_TYPE_THERMAL)) {
441                 return_ACPI_STATUS(AE_OK);
442         }
443
444         /*
445          * Because of an earlier namespace analysis, all subtrees that contain an
446          * _INI method are tagged.
447          *
448          * If this device subtree does not contain any _INI methods, we
449          * can exit now and stop traversing this entire subtree.
450          */
451         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
452                 return_ACPI_STATUS(AE_CTRL_DEPTH);
453         }
454
455         /*
456          * Run _STA to determine if this device is present and functioning. We
457          * must know this information for two important reasons (from ACPI spec):
458          *
459          * 1) We can only run _INI if the device is present.
460          * 2) We must abort the device tree walk on this subtree if the device is
461          *    not present and is not functional (we will not examine the children)
462          *
463          * The _STA method is not required to be present under the device, we
464          * assume the device is present if _STA does not exist.
465          */
466         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
467                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
468
469         status = acpi_ut_execute_STA(device_node, &flags);
470         if (ACPI_FAILURE(status)) {
471
472                 /* Ignore error and move on to next device */
473
474                 return_ACPI_STATUS(AE_OK);
475         }
476
477         /*
478          * Flags == -1 means that _STA was not found. In this case, we assume that
479          * the device is both present and functional.
480          *
481          * From the ACPI spec, description of _STA:
482          *
483          * "If a device object (including the processor object) does not have an
484          * _STA object, then OSPM assumes that all of the above bits are set (in
485          * other words, the device is present, ..., and functioning)"
486          */
487         if (flags != ACPI_UINT32_MAX) {
488                 walk_info->num_STA++;
489         }
490
491         /*
492          * Examine the PRESENT and FUNCTIONING status bits
493          *
494          * Note: ACPI spec does not seem to specify behavior for the present but
495          * not functioning case, so we assume functioning if present.
496          */
497         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
498
499                 /* Device is not present, we must examine the Functioning bit */
500
501                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
502                         /*
503                          * Device is not present but is "functioning". In this case,
504                          * we will not run _INI, but we continue to examine the children
505                          * of this device.
506                          *
507                          * From the ACPI spec, description of _STA: (Note - no mention
508                          * of whether to run _INI or not on the device in question)
509                          *
510                          * "_STA may return bit 0 clear (not present) with bit 3 set
511                          * (device is functional). This case is used to indicate a valid
512                          * device for which no device driver should be loaded (for example,
513                          * a bridge device.) Children of this device may be present and
514                          * valid. OSPM should continue enumeration below a device whose
515                          * _STA returns this bit combination"
516                          */
517                         return_ACPI_STATUS(AE_OK);
518                 } else {
519                         /*
520                          * Device is not present and is not functioning. We must abort the
521                          * walk of this subtree immediately -- don't look at the children
522                          * of such a device.
523                          *
524                          * From the ACPI spec, description of _INI:
525                          *
526                          * "If the _STA method indicates that the device is not present,
527                          * OSPM will not run the _INI and will not examine the children
528                          * of the device for _INI methods"
529                          */
530                         return_ACPI_STATUS(AE_CTRL_DEPTH);
531                 }
532         }
533
534         /*
535          * The device is present or is assumed present if no _STA exists.
536          * Run the _INI if it exists (not required to exist)
537          *
538          * Note: We know there is an _INI within this subtree, but it may not be
539          * under this particular device, it may be lower in the branch.
540          */
541         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
542                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
543
544         info->prefix_node = device_node;
545         info->pathname = METHOD_NAME__INI;
546         info->parameters = NULL;
547         info->flags = ACPI_IGNORE_RETURN_VALUE;
548
549         /*
550          * Some hardware relies on this being executed as atomically
551          * as possible (without an NMI being received in the middle of
552          * this) - so disable NMIs and initialize the device:
553          */
554         acpi_nmi_disable();
555         status = acpi_ns_evaluate(info);
556         acpi_nmi_enable();
557
558         if (ACPI_SUCCESS(status)) {
559                 walk_info->num_INI++;
560
561                 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
562                     (!(acpi_dbg_level & ACPI_LV_INFO))) {
563                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
564                 }
565         }
566 #ifdef ACPI_DEBUG_OUTPUT
567         else if (status != AE_NOT_FOUND) {
568
569                 /* Ignore error and move on to next device */
570
571                 char *scope_name =
572                     acpi_ns_get_external_pathname(info->resolved_node);
573
574                 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
575                                 scope_name));
576                 ACPI_FREE(scope_name);
577         }
578 #endif
579
580         /* Ignore errors from above */
581
582         status = AE_OK;
583
584         /*
585          * The _INI method has been run if present; call the Global Initialization
586          * Handler for this device.
587          */
588         if (acpi_gbl_init_handler) {
589                 status =
590                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
591         }
592
593         return_ACPI_STATUS(status);
594 }