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 }
584
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