projects / deliverable / linux.git / blob
? search:


3ddddbfa8db7766c519a3907c266894a44a0ceb5
[deliverable/linux.git] / drivers / acpi / events / evregion.c
1 /******************************************************************************
2 *
3 * Module Name: evregion - ACPI address_space (op_region) handler dispatch
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 <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acinterp.h>
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evregion")
51
52 /* Local prototypes */
53 static acpi_status
54 acpi_ev_reg_run(acpi_handle obj_handle,
55 u32 level, void *context, void **return_value);
56
57 static acpi_status
58 acpi_ev_install_handler(acpi_handle obj_handle,
59 u32 level, void *context, void **return_value);
60
61 /* These are the address spaces that will get default handlers */
62
63 #define ACPI_NUM_DEFAULT_SPACES 4
64
65 static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
66 ACPI_ADR_SPACE_SYSTEM_MEMORY,
67 ACPI_ADR_SPACE_SYSTEM_IO,
68 ACPI_ADR_SPACE_PCI_CONFIG,
69 ACPI_ADR_SPACE_DATA_TABLE
70 };
71
72 /*******************************************************************************
73 *
74 * FUNCTION: acpi_ev_install_region_handlers
75 *
76 * PARAMETERS: None
77 *
78 * RETURN: Status
79 *
80 * DESCRIPTION: Installs the core subsystem default address space handlers.
81 *
82 ******************************************************************************/
83
84 acpi_status acpi_ev_install_region_handlers(void)
85 {
86 acpi_status status;
87 u32 i;
88
89 ACPI_FUNCTION_TRACE(ev_install_region_handlers);
90
91 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
92 if (ACPI_FAILURE(status)) {
93 return_ACPI_STATUS(status);
94 }
95
96 /*
97 * All address spaces (PCI Config, EC, SMBus) are scope dependent and
98 * registration must occur for a specific device.
99 *
100 * In the case of the system memory and IO address spaces there is
101 * currently no device associated with the address space. For these we
102 * use the root.
103 *
104 * We install the default PCI config space handler at the root so that
105 * this space is immediately available even though the we have not
106 * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
107 * specification which states that the PCI config space must be always
108 * available -- even though we are nowhere near ready to find the PCI root
109 * buses at this point.
110 *
111 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
112 * has already been installed (via acpi_install_address_space_handler).
113 * Similar for AE_SAME_HANDLER.
114 */
115 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
116 status = acpi_ev_install_space_handler(acpi_gbl_root_node,
117 acpi_gbl_default_address_spaces
118 [i],
119 ACPI_DEFAULT_HANDLER,
120 NULL, NULL);
121 switch (status) {
122 case AE_OK:
123 case AE_SAME_HANDLER:
124 case AE_ALREADY_EXISTS:
125
126 /* These exceptions are all OK */
127
128 status = AE_OK;
129 break;
130
131 default:
132
133 goto unlock_and_exit;
134 }
135 }
136
137 unlock_and_exit:
138 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
139 return_ACPI_STATUS(status);
140 }
141
142 /*******************************************************************************
143 *
144 * FUNCTION: acpi_ev_initialize_op_regions
145 *
146 * PARAMETERS: None
147 *
148 * RETURN: Status
149 *
150 * DESCRIPTION: Execute _REG methods for all Operation Regions that have
151 * an installed default region handler.
152 *
153 ******************************************************************************/
154
155 acpi_status acpi_ev_initialize_op_regions(void)
156 {
157 acpi_status status;
158 u32 i;
159
160 ACPI_FUNCTION_TRACE(ev_initialize_op_regions);
161
162 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
163 if (ACPI_FAILURE(status)) {
164 return_ACPI_STATUS(status);
165 }
166
167 /* Run the _REG methods for op_regions in each default address space */
168
169 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
170 /*
171 * TBD: Make sure handler is the DEFAULT handler, otherwise
172 * _REG will have already been run.
173 */
174 status = acpi_ev_execute_reg_methods(acpi_gbl_root_node,
175 acpi_gbl_default_address_spaces
176 [i]);
177 }
178
179 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
180 return_ACPI_STATUS(status);
181 }
182
183 /*******************************************************************************
184 *
185 * FUNCTION: acpi_ev_execute_reg_method
186 *
187 * PARAMETERS: region_obj - Region object
188 * Function - Passed to _REG: On (1) or Off (0)
189 *
190 * RETURN: Status
191 *
192 * DESCRIPTION: Execute _REG method for a region
193 *
194 ******************************************************************************/
195
196 acpi_status
197 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
198 {
199 struct acpi_evaluate_info *info;
200 union acpi_operand_object *args[3];
201 union acpi_operand_object *region_obj2;
202 acpi_status status;
203
204 ACPI_FUNCTION_TRACE(ev_execute_reg_method);
205
206 region_obj2 = acpi_ns_get_secondary_object(region_obj);
207 if (!region_obj2) {
208 return_ACPI_STATUS(AE_NOT_EXIST);
209 }
210
211 if (region_obj2->extra.method_REG == NULL) {
212 return_ACPI_STATUS(AE_OK);
213 }
214
215 /* Allocate and initialize the evaluation information block */
216
217 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
218 if (!info) {
219 return_ACPI_STATUS(AE_NO_MEMORY);
220 }
221
222 info->prefix_node = region_obj2->extra.method_REG;
223 info->pathname = NULL;
224 info->parameters = args;
225 info->flags = ACPI_IGNORE_RETURN_VALUE;
226
227 /*
228 * The _REG method has two arguments:
229 *
230 * Arg0 - Integer:
231 * Operation region space ID Same value as region_obj->Region.space_id
232 *
233 * Arg1 - Integer:
234 * connection status 1 for connecting the handler, 0 for disconnecting
235 * the handler (Passed as a parameter)
236 */
237 args[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
238 if (!args[0]) {
239 status = AE_NO_MEMORY;
240 goto cleanup1;
241 }
242
243 args[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
244 if (!args[1]) {
245 status = AE_NO_MEMORY;
246 goto cleanup2;
247 }
248
249 /* Setup the parameter objects */
250
251 args[0]->integer.value = region_obj->region.space_id;
252 args[1]->integer.value = function;
253 args[2] = NULL;
254
255 /* Execute the method, no return value */
256
257 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
258 (ACPI_TYPE_METHOD, info->prefix_node, NULL));
259
260 status = acpi_ns_evaluate(info);
261 acpi_ut_remove_reference(args[1]);
262
263 cleanup2:
264 acpi_ut_remove_reference(args[0]);
265
266 cleanup1:
267 ACPI_FREE(info);
268 return_ACPI_STATUS(status);
269 }
270
271 /*******************************************************************************
272 *
273 * FUNCTION: acpi_ev_address_space_dispatch
274 *
275 * PARAMETERS: region_obj - Internal region object
276 * Function - Read or Write operation
277 * Address - Where in the space to read or write
278 * bit_width - Field width in bits (8, 16, 32, or 64)
279 * Value - Pointer to in or out value, must be
280 * full 64-bit acpi_integer
281 *
282 * RETURN: Status
283 *
284 * DESCRIPTION: Dispatch an address space or operation region access to
285 * a previously installed handler.
286 *
287 ******************************************************************************/
288
289 acpi_status
290 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
291 u32 function,
292 acpi_physical_address address,
293 u32 bit_width, acpi_integer * value)
294 {
295 acpi_status status;
296 acpi_adr_space_handler handler;
297 acpi_adr_space_setup region_setup;
298 union acpi_operand_object *handler_desc;
299 union acpi_operand_object *region_obj2;
300 void *region_context = NULL;
301
302 ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
303
304 region_obj2 = acpi_ns_get_secondary_object(region_obj);
305 if (!region_obj2) {
306 return_ACPI_STATUS(AE_NOT_EXIST);
307 }
308
309 /* Ensure that there is a handler associated with this region */
310
311 handler_desc = region_obj->region.handler;
312 if (!handler_desc) {
313 ACPI_ERROR((AE_INFO,
314 "No handler for Region [%4.4s] (%p) [%s]",
315 acpi_ut_get_node_name(region_obj->region.node),
316 region_obj,
317 acpi_ut_get_region_name(region_obj->region.
318 space_id)));
319
320 return_ACPI_STATUS(AE_NOT_EXIST);
321 }
322
323 /*
324 * It may be the case that the region has never been initialized.
325 * Some types of regions require special init code
326 */
327 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
328
329 /* This region has not been initialized yet, do it */
330
331 region_setup = handler_desc->address_space.setup;
332 if (!region_setup) {
333
334 /* No initialization routine, exit with error */
335
336 ACPI_ERROR((AE_INFO,
337 "No init routine for region(%p) [%s]",
338 region_obj,
339 acpi_ut_get_region_name(region_obj->region.
340 space_id)));
341 return_ACPI_STATUS(AE_NOT_EXIST);
342 }
343
344 /*
345 * We must exit the interpreter because the region setup will
346 * potentially execute control methods (for example, the _REG method
347 * for this region)
348 */
349 acpi_ex_exit_interpreter();
350
351 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
352 handler_desc->address_space.context,
353 &region_context);
354
355 /* Re-enter the interpreter */
356
357 acpi_ex_enter_interpreter();
358
359 /* Check for failure of the Region Setup */
360
361 if (ACPI_FAILURE(status)) {
362 ACPI_EXCEPTION((AE_INFO, status,
363 "During region initialization: [%s]",
364 acpi_ut_get_region_name(region_obj->
365 region.
366 space_id)));
367 return_ACPI_STATUS(status);
368 }
369
370 /* Region initialization may have been completed by region_setup */
371
372 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
373 region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
374
375 if (region_obj2->extra.region_context) {
376
377 /* The handler for this region was already installed */
378
379 ACPI_FREE(region_context);
380 } else {
381 /*
382 * Save the returned context for use in all accesses to
383 * this particular region
384 */
385 region_obj2->extra.region_context =
386 region_context;
387 }
388 }
389 }
390
391 /* We have everything we need, we can invoke the address space handler */
392
393 handler = handler_desc->address_space.handler;
394
395 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
396 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
397 &region_obj->region.handler->address_space, handler,
398 ACPI_FORMAT_NATIVE_UINT(address),
399 acpi_ut_get_region_name(region_obj->region.
400 space_id)));
401
402 if (!(handler_desc->address_space.handler_flags &
403 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
404 /*
405 * For handlers other than the default (supplied) handlers, we must
406 * exit the interpreter because the handler *might* block -- we don't
407 * know what it will do, so we can't hold the lock on the intepreter.
408 */
409 acpi_ex_exit_interpreter();
410 }
411
412 /* Call the handler */
413
414 status = handler(function, address, bit_width, value,
415 handler_desc->address_space.context,
416 region_obj2->extra.region_context);
417
418 if (ACPI_FAILURE(status)) {
419 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
420 acpi_ut_get_region_name(region_obj->region.
421 space_id)));
422 }
423
424 if (!(handler_desc->address_space.handler_flags &
425 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
426 /*
427 * We just returned from a non-default handler, we must re-enter the
428 * interpreter
429 */
430 acpi_ex_enter_interpreter();
431 }
432
433 return_ACPI_STATUS(status);
434 }
435
436 /*******************************************************************************
437 *
438 * FUNCTION: acpi_ev_detach_region
439 *
440 * PARAMETERS: region_obj - Region Object
441 * acpi_ns_is_locked - Namespace Region Already Locked?
442 *
443 * RETURN: None
444 *
445 * DESCRIPTION: Break the association between the handler and the region
446 * this is a two way association.
447 *
448 ******************************************************************************/
449
450 void
451 acpi_ev_detach_region(union acpi_operand_object *region_obj,
452 u8 acpi_ns_is_locked)
453 {
454 union acpi_operand_object *handler_obj;
455 union acpi_operand_object *obj_desc;
456 union acpi_operand_object **last_obj_ptr;
457 acpi_adr_space_setup region_setup;
458 void **region_context;
459 union acpi_operand_object *region_obj2;
460 acpi_status status;
461
462 ACPI_FUNCTION_TRACE(ev_detach_region);
463
464 region_obj2 = acpi_ns_get_secondary_object(region_obj);
465 if (!region_obj2) {
466 return_VOID;
467 }
468 region_context = &region_obj2->extra.region_context;
469
470 /* Get the address handler from the region object */
471
472 handler_obj = region_obj->region.handler;
473 if (!handler_obj) {
474
475 /* This region has no handler, all done */
476
477 return_VOID;
478 }
479
480 /* Find this region in the handler's list */
481
482 obj_desc = handler_obj->address_space.region_list;
483 last_obj_ptr = &handler_obj->address_space.region_list;
484
485 while (obj_desc) {
486
487 /* Is this the correct Region? */
488
489 if (obj_desc == region_obj) {
490 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
491 "Removing Region %p from address handler %p\n",
492 region_obj, handler_obj));
493
494 /* This is it, remove it from the handler's list */
495
496 *last_obj_ptr = obj_desc->region.next;
497 obj_desc->region.next = NULL; /* Must clear field */
498
499 if (acpi_ns_is_locked) {
500 status =
501 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
502 if (ACPI_FAILURE(status)) {
503 return_VOID;
504 }
505 }
506
507 /* Now stop region accesses by executing the _REG method */
508
509 status = acpi_ev_execute_reg_method(region_obj, 0);
510 if (ACPI_FAILURE(status)) {
511 ACPI_EXCEPTION((AE_INFO, status,
512 "from region _REG, [%s]",
513 acpi_ut_get_region_name
514 (region_obj->region.space_id)));
515 }
516
517 if (acpi_ns_is_locked) {
518 status =
519 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
520 if (ACPI_FAILURE(status)) {
521 return_VOID;
522 }
523 }
524
525 /*
526 * If the region has been activated, call the setup handler with
527 * the deactivate notification
528 */
529 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
530 region_setup = handler_obj->address_space.setup;
531 status =
532 region_setup(region_obj,
533 ACPI_REGION_DEACTIVATE,
534 handler_obj->address_space.
535 context, region_context);
536
537 /* Init routine may fail, Just ignore errors */
538
539 if (ACPI_FAILURE(status)) {
540 ACPI_EXCEPTION((AE_INFO, status,
541 "from region handler - deactivate, [%s]",
542 acpi_ut_get_region_name
543 (region_obj->region.
544 space_id)));
545 }
546
547 region_obj->region.flags &=
548 ~(AOPOBJ_SETUP_COMPLETE);
549 }
550
551 /*
552 * Remove handler reference in the region
553 *
554 * NOTE: this doesn't mean that the region goes away, the region
555 * is just inaccessible as indicated to the _REG method
556 *
557 * If the region is on the handler's list, this must be the
558 * region's handler
559 */
560 region_obj->region.handler = NULL;
561 acpi_ut_remove_reference(handler_obj);
562
563 return_VOID;
564 }
565
566 /* Walk the linked list of handlers */
567
568 last_obj_ptr = &obj_desc->region.next;
569 obj_desc = obj_desc->region.next;
570 }
571
572 /* If we get here, the region was not in the handler's region list */
573
574 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
575 "Cannot remove region %p from address handler %p\n",
576 region_obj, handler_obj));
577
578 return_VOID;
579 }
580
581 /*******************************************************************************
582 *
583 * FUNCTION: acpi_ev_attach_region
584 *
585 * PARAMETERS: handler_obj - Handler Object
586 * region_obj - Region Object
587 * acpi_ns_is_locked - Namespace Region Already Locked?
588 *
589 * RETURN: None
590 *
591 * DESCRIPTION: Create the association between the handler and the region
592 * this is a two way association.
593 *
594 ******************************************************************************/
595
596 acpi_status
597 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
598 union acpi_operand_object *region_obj,
599 u8 acpi_ns_is_locked)
600 {
601
602 ACPI_FUNCTION_TRACE(ev_attach_region);
603
604 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
605 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
606 acpi_ut_get_node_name(region_obj->region.node),
607 region_obj, handler_obj,
608 acpi_ut_get_region_name(region_obj->region.
609 space_id)));
610
611 /* Link this region to the front of the handler's list */
612
613 region_obj->region.next = handler_obj->address_space.region_list;
614 handler_obj->address_space.region_list = region_obj;
615
616 /* Install the region's handler */
617
618 if (region_obj->region.handler) {
619 return_ACPI_STATUS(AE_ALREADY_EXISTS);
620 }
621
622 region_obj->region.handler = handler_obj;
623 acpi_ut_add_reference(handler_obj);
624
625 return_ACPI_STATUS(AE_OK);
626 }
627
628 /*******************************************************************************
629 *
630 * FUNCTION: acpi_ev_install_handler
631 *
632 * PARAMETERS: walk_namespace callback
633 *
634 * DESCRIPTION: This routine installs an address handler into objects that are
635 * of type Region or Device.
636 *
637 * If the Object is a Device, and the device has a handler of
638 * the same type then the search is terminated in that branch.
639 *
640 * This is because the existing handler is closer in proximity
641 * to any more regions than the one we are trying to install.
642 *
643 ******************************************************************************/
644
645 static acpi_status
646 acpi_ev_install_handler(acpi_handle obj_handle,
647 u32 level, void *context, void **return_value)
648 {
649 union acpi_operand_object *handler_obj;
650 union acpi_operand_object *next_handler_obj;
651 union acpi_operand_object *obj_desc;
652 struct acpi_namespace_node *node;
653 acpi_status status;
654
655 ACPI_FUNCTION_NAME(ev_install_handler);
656
657 handler_obj = (union acpi_operand_object *)context;
658
659 /* Parameter validation */
660
661 if (!handler_obj) {
662 return (AE_OK);
663 }
664
665 /* Convert and validate the device handle */
666
667 node = acpi_ns_map_handle_to_node(obj_handle);
668 if (!node) {
669 return (AE_BAD_PARAMETER);
670 }
671
672 /*
673 * We only care about regions and objects that are allowed to have
674 * address space handlers
675 */
676 if ((node->type != ACPI_TYPE_DEVICE) &&
677 (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
678 return (AE_OK);
679 }
680
681 /* Check for an existing internal object */
682
683 obj_desc = acpi_ns_get_attached_object(node);
684 if (!obj_desc) {
685
686 /* No object, just exit */
687
688 return (AE_OK);
689 }
690
691 /* Devices are handled different than regions */
692
693 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
694
695 /* Check if this Device already has a handler for this address space */
696
697 next_handler_obj = obj_desc->device.handler;
698 while (next_handler_obj) {
699
700 /* Found a handler, is it for the same address space? */
701
702 if (next_handler_obj->address_space.space_id ==
703 handler_obj->address_space.space_id) {
704 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
705 "Found handler for region [%s] in device %p(%p) handler %p\n",
706 acpi_ut_get_region_name
707 (handler_obj->address_space.
708 space_id), obj_desc,
709 next_handler_obj,
710 handler_obj));
711
712 /*
713 * Since the object we found it on was a device, then it
714 * means that someone has already installed a handler for
715 * the branch of the namespace from this device on. Just
716 * bail out telling the walk routine to not traverse this
717 * branch. This preserves the scoping rule for handlers.
718 */
719 return (AE_CTRL_DEPTH);
720 }
721
722 /* Walk the linked list of handlers attached to this device */
723
724 next_handler_obj = next_handler_obj->address_space.next;
725 }
726
727 /*
728 * As long as the device didn't have a handler for this space we
729 * don't care about it. We just ignore it and proceed.
730 */
731 return (AE_OK);
732 }
733
734 /* Object is a Region */
735
736 if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
737
738 /* This region is for a different address space, just ignore it */
739
740 return (AE_OK);
741 }
742
743 /*
744 * Now we have a region and it is for the handler's address space type.
745 *
746 * First disconnect region for any previous handler (if any)
747 */
748 acpi_ev_detach_region(obj_desc, FALSE);
749
750 /* Connect the region to the new handler */
751
752 status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
753 return (status);
754 }
755
756 /*******************************************************************************
757 *
758 * FUNCTION: acpi_ev_install_space_handler
759 *
760 * PARAMETERS: Node - Namespace node for the device
761 * space_id - The address space ID
762 * Handler - Address of the handler
763 * Setup - Address of the setup function
764 * Context - Value passed to the handler on each access
765 *
766 * RETURN: Status
767 *
768 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
769 * Assumes namespace is locked
770 *
771 ******************************************************************************/
772
773 acpi_status
774 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
775 acpi_adr_space_type space_id,
776 acpi_adr_space_handler handler,
777 acpi_adr_space_setup setup, void *context)
778 {
779 union acpi_operand_object *obj_desc;
780 union acpi_operand_object *handler_obj;
781 acpi_status status;
782 acpi_object_type type;
783 u8 flags = 0;
784
785 ACPI_FUNCTION_TRACE(ev_install_space_handler);
786
787 /*
788 * This registration is valid for only the types below and the root. This
789 * is where the default handlers get placed.
790 */
791 if ((node->type != ACPI_TYPE_DEVICE) &&
792 (node->type != ACPI_TYPE_PROCESSOR) &&
793 (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
794 status = AE_BAD_PARAMETER;
795 goto unlock_and_exit;
796 }
797
798 if (handler == ACPI_DEFAULT_HANDLER) {
799 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
800
801 switch (space_id) {
802 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
803 handler = acpi_ex_system_memory_space_handler;
804 setup = acpi_ev_system_memory_region_setup;
805 break;
806
807 case ACPI_ADR_SPACE_SYSTEM_IO:
808 handler = acpi_ex_system_io_space_handler;
809 setup = acpi_ev_io_space_region_setup;
810 break;
811
812 case ACPI_ADR_SPACE_PCI_CONFIG:
813 handler = acpi_ex_pci_config_space_handler;
814 setup = acpi_ev_pci_config_region_setup;
815 break;
816
817 case ACPI_ADR_SPACE_CMOS:
818 handler = acpi_ex_cmos_space_handler;
819 setup = acpi_ev_cmos_region_setup;
820 break;
821
822 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
823 handler = acpi_ex_pci_bar_space_handler;
824 setup = acpi_ev_pci_bar_region_setup;
825 break;
826
827 case ACPI_ADR_SPACE_DATA_TABLE:
828 handler = acpi_ex_data_table_space_handler;
829 setup = NULL;
830 break;
831
832 default:
833 status = AE_BAD_PARAMETER;
834 goto unlock_and_exit;
835 }
836 }
837
838 /* If the caller hasn't specified a setup routine, use the default */
839
840 if (!setup) {
841 setup = acpi_ev_default_region_setup;
842 }
843
844 /* Check for an existing internal object */
845
846 obj_desc = acpi_ns_get_attached_object(node);
847 if (obj_desc) {
848 /*
849 * The attached device object already exists. Make sure the handler
850 * is not already installed.
851 */
852 handler_obj = obj_desc->device.handler;
853
854 /* Walk the handler list for this device */
855
856 while (handler_obj) {
857
858 /* Same space_id indicates a handler already installed */
859
860 if (handler_obj->address_space.space_id == space_id) {
861 if (handler_obj->address_space.handler ==
862 handler) {
863 /*
864 * It is (relatively) OK to attempt to install the SAME
865 * handler twice. This can easily happen with the
866 * PCI_Config space.
867 */
868 status = AE_SAME_HANDLER;
869 goto unlock_and_exit;
870 } else {
871 /* A handler is already installed */
872
873 status = AE_ALREADY_EXISTS;
874 }
875 goto unlock_and_exit;
876 }
877
878 /* Walk the linked list of handlers */
879
880 handler_obj = handler_obj->address_space.next;
881 }
882 } else {
883 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
884 "Creating object on Device %p while installing handler\n",
885 node));
886
887 /* obj_desc does not exist, create one */
888
889 if (node->type == ACPI_TYPE_ANY) {
890 type = ACPI_TYPE_DEVICE;
891 } else {
892 type = node->type;
893 }
894
895 obj_desc = acpi_ut_create_internal_object(type);
896 if (!obj_desc) {
897 status = AE_NO_MEMORY;
898 goto unlock_and_exit;
899 }
900
901 /* Init new descriptor */
902
903 obj_desc->common.type = (u8) type;
904
905 /* Attach the new object to the Node */
906
907 status = acpi_ns_attach_object(node, obj_desc, type);
908
909 /* Remove local reference to the object */
910
911 acpi_ut_remove_reference(obj_desc);
912
913 if (ACPI_FAILURE(status)) {
914 goto unlock_and_exit;
915 }
916 }
917
918 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
919 "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
920 acpi_ut_get_region_name(space_id), space_id,
921 acpi_ut_get_node_name(node), node, obj_desc));
922
923 /*
924 * Install the handler
925 *
926 * At this point there is no existing handler. Just allocate the object
927 * for the handler and link it into the list.
928 */
929 handler_obj =
930 acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
931 if (!handler_obj) {
932 status = AE_NO_MEMORY;
933 goto unlock_and_exit;
934 }
935
936 /* Init handler obj */
937
938 handler_obj->address_space.space_id = (u8) space_id;
939 handler_obj->address_space.handler_flags = flags;
940 handler_obj->address_space.region_list = NULL;
941 handler_obj->address_space.node = node;
942 handler_obj->address_space.handler = handler;
943 handler_obj->address_space.context = context;
944 handler_obj->address_space.setup = setup;
945
946 /* Install at head of Device.address_space list */
947
948 handler_obj->address_space.next = obj_desc->device.handler;
949
950 /*
951 * The Device object is the first reference on the handler_obj.
952 * Each region that uses the handler adds a reference.
953 */
954 obj_desc->device.handler = handler_obj;
955
956 /*
957 * Walk the namespace finding all of the regions this
958 * handler will manage.
959 *
960 * Start at the device and search the branch toward
961 * the leaf nodes until either the leaf is encountered or
962 * a device is detected that has an address handler of the
963 * same type.
964 *
965 * In either case, back up and search down the remainder
966 * of the branch
967 */
968 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
969 ACPI_NS_WALK_UNLOCK,
970 acpi_ev_install_handler, handler_obj,
971 NULL);
972
973 unlock_and_exit:
974 return_ACPI_STATUS(status);
975 }
976
977 /*******************************************************************************
978 *
979 * FUNCTION: acpi_ev_execute_reg_methods
980 *
981 * PARAMETERS: Node - Namespace node for the device
982 * space_id - The address space ID
983 *
984 * RETURN: Status
985 *
986 * DESCRIPTION: Run all _REG methods for the input Space ID;
987 * Note: assumes namespace is locked, or system init time.
988 *
989 ******************************************************************************/
990
991 acpi_status
992 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
993 acpi_adr_space_type space_id)
994 {
995 acpi_status status;
996
997 ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
998
999 /*
1000 * Run all _REG methods for all Operation Regions for this space ID. This
1001 * is a separate walk in order to handle any interdependencies between
1002 * regions and _REG methods. (i.e. handlers must be installed for all
1003 * regions of this Space ID before we can run any _REG methods)
1004 */
1005 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
1006 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
1007 &space_id, NULL);
1008
1009 return_ACPI_STATUS(status);
1010 }
1011
1012 /*******************************************************************************
1013 *
1014 * FUNCTION: acpi_ev_reg_run
1015 *
1016 * PARAMETERS: walk_namespace callback
1017 *
1018 * DESCRIPTION: Run _REG method for region objects of the requested space_iD
1019 *
1020 ******************************************************************************/
1021
1022 static acpi_status
1023 acpi_ev_reg_run(acpi_handle obj_handle,
1024 u32 level, void *context, void **return_value)
1025 {
1026 union acpi_operand_object *obj_desc;
1027 struct acpi_namespace_node *node;
1028 acpi_adr_space_type space_id;
1029 acpi_status status;
1030
1031 space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1032
1033 /* Convert and validate the device handle */
1034
1035 node = acpi_ns_map_handle_to_node(obj_handle);
1036 if (!node) {
1037 return (AE_BAD_PARAMETER);
1038 }
1039
1040 /*
1041 * We only care about regions.and objects that are allowed to have address
1042 * space handlers
1043 */
1044 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1045 return (AE_OK);
1046 }
1047
1048 /* Check for an existing internal object */
1049
1050 obj_desc = acpi_ns_get_attached_object(node);
1051 if (!obj_desc) {
1052
1053 /* No object, just exit */
1054
1055 return (AE_OK);
1056 }
1057
1058 /* Object is a Region */
1059
1060 if (obj_desc->region.space_id != space_id) {
1061
1062 /* This region is for a different address space, just ignore it */
1063
1064 return (AE_OK);
1065 }
1066
1067 status = acpi_ev_execute_reg_method(obj_desc, 1);
1068 return (status);
1069 }
Linux kernel - Deliverables
This page took 0.053412 seconds and 5 git commands to generate.