1 /******************************************************************************
3 * Module Name: evregion - ACPI address_space (op_region) handler dispatch
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2006, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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.
44 #include <acpi/acpi.h>
45 #include <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acinterp.h>
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evregion")
51 #define ACPI_NUM_DEFAULT_SPACES 4
52 static u8 acpi_gbl_default_address_spaces
[ACPI_NUM_DEFAULT_SPACES
] = {
53 ACPI_ADR_SPACE_SYSTEM_MEMORY
,
54 ACPI_ADR_SPACE_SYSTEM_IO
,
55 ACPI_ADR_SPACE_PCI_CONFIG
,
56 ACPI_ADR_SPACE_DATA_TABLE
59 /* Local prototypes */
62 acpi_ev_reg_run(acpi_handle obj_handle
,
63 u32 level
, void *context
, void **return_value
);
66 acpi_ev_install_handler(acpi_handle obj_handle
,
67 u32 level
, void *context
, void **return_value
);
69 /*******************************************************************************
71 * FUNCTION: acpi_ev_install_region_handlers
77 * DESCRIPTION: Installs the core subsystem default address space handlers.
79 ******************************************************************************/
81 acpi_status
acpi_ev_install_region_handlers(void)
86 ACPI_FUNCTION_TRACE("ev_install_region_handlers");
88 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
89 if (ACPI_FAILURE(status
)) {
90 return_ACPI_STATUS(status
);
94 * All address spaces (PCI Config, EC, SMBus) are scope dependent
95 * and registration must occur for a specific device.
97 * In the case of the system memory and IO address spaces there is currently
98 * no device associated with the address space. For these we use the root.
100 * We install the default PCI config space handler at the root so
101 * that this space is immediately available even though the we have
102 * not enumerated all the PCI Root Buses yet. This is to conform
103 * to the ACPI specification which states that the PCI config
104 * space must be always available -- even though we are nowhere
105 * near ready to find the PCI root buses at this point.
107 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
108 * has already been installed (via acpi_install_address_space_handler).
109 * Similar for AE_SAME_HANDLER.
111 for (i
= 0; i
< ACPI_NUM_DEFAULT_SPACES
; i
++) {
112 status
= acpi_ev_install_space_handler(acpi_gbl_root_node
,
113 acpi_gbl_default_address_spaces
115 ACPI_DEFAULT_HANDLER
,
119 case AE_SAME_HANDLER
:
120 case AE_ALREADY_EXISTS
:
122 /* These exceptions are all OK */
129 goto unlock_and_exit
;
134 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
135 return_ACPI_STATUS(status
);
138 /*******************************************************************************
140 * FUNCTION: acpi_ev_initialize_op_regions
146 * DESCRIPTION: Execute _REG methods for all Operation Regions that have
147 * an installed default region handler.
149 ******************************************************************************/
151 acpi_status
acpi_ev_initialize_op_regions(void)
156 ACPI_FUNCTION_TRACE("ev_initialize_op_regions");
158 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
159 if (ACPI_FAILURE(status
)) {
160 return_ACPI_STATUS(status
);
164 * Run the _REG methods for op_regions in each default address space
166 for (i
= 0; i
< ACPI_NUM_DEFAULT_SPACES
; i
++) {
168 /* TBD: Make sure handler is the DEFAULT handler, otherwise
169 * _REG will have already been run.
171 status
= acpi_ev_execute_reg_methods(acpi_gbl_root_node
,
172 acpi_gbl_default_address_spaces
176 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
177 return_ACPI_STATUS(status
);
180 /*******************************************************************************
182 * FUNCTION: acpi_ev_execute_reg_method
184 * PARAMETERS: region_obj - Region object
185 * Function - Passed to _REG: On (1) or Off (0)
189 * DESCRIPTION: Execute _REG method for a region
191 ******************************************************************************/
194 acpi_ev_execute_reg_method(union acpi_operand_object
*region_obj
, u32 function
)
196 struct acpi_parameter_info info
;
197 union acpi_operand_object
*params
[3];
198 union acpi_operand_object
*region_obj2
;
201 ACPI_FUNCTION_TRACE("ev_execute_reg_method");
203 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
205 return_ACPI_STATUS(AE_NOT_EXIST
);
208 if (region_obj2
->extra
.method_REG
== NULL
) {
209 return_ACPI_STATUS(AE_OK
);
213 * The _REG method has two arguments:
215 * Arg0, Integer: Operation region space ID
216 * Same value as region_obj->Region.space_id
217 * Arg1, Integer: connection status
218 * 1 for connecting the handler,
219 * 0 for disconnecting the handler
220 * Passed as a parameter
222 params
[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER
);
224 return_ACPI_STATUS(AE_NO_MEMORY
);
227 params
[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER
);
229 status
= AE_NO_MEMORY
;
233 /* Setup the parameter objects */
235 params
[0]->integer
.value
= region_obj
->region
.space_id
;
236 params
[1]->integer
.value
= function
;
239 info
.node
= region_obj2
->extra
.method_REG
;
240 info
.parameters
= params
;
241 info
.parameter_type
= ACPI_PARAM_ARGS
;
243 /* Execute the method, no return value */
245 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
246 (ACPI_TYPE_METHOD
, info
.node
, NULL
));
247 status
= acpi_ns_evaluate_by_handle(&info
);
249 acpi_ut_remove_reference(params
[1]);
252 acpi_ut_remove_reference(params
[0]);
254 return_ACPI_STATUS(status
);
257 /*******************************************************************************
259 * FUNCTION: acpi_ev_address_space_dispatch
261 * PARAMETERS: region_obj - Internal region object
262 * Function - Read or Write operation
263 * Address - Where in the space to read or write
264 * bit_width - Field width in bits (8, 16, 32, or 64)
265 * Value - Pointer to in or out value
269 * DESCRIPTION: Dispatch an address space or operation region access to
270 * a previously installed handler.
272 ******************************************************************************/
275 acpi_ev_address_space_dispatch(union acpi_operand_object
*region_obj
,
277 acpi_physical_address address
,
278 u32 bit_width
, void *value
)
282 acpi_adr_space_handler handler
;
283 acpi_adr_space_setup region_setup
;
284 union acpi_operand_object
*handler_desc
;
285 union acpi_operand_object
*region_obj2
;
286 void *region_context
= NULL
;
288 ACPI_FUNCTION_TRACE("ev_address_space_dispatch");
290 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
292 return_ACPI_STATUS(AE_NOT_EXIST
);
295 /* Ensure that there is a handler associated with this region */
297 handler_desc
= region_obj
->region
.handler
;
300 "No handler for Region [%4.4s] (%p) [%s]",
301 acpi_ut_get_node_name(region_obj
->region
.node
),
303 acpi_ut_get_region_name(region_obj
->region
.
306 return_ACPI_STATUS(AE_NOT_EXIST
);
310 * It may be the case that the region has never been initialized
311 * Some types of regions require special init code
313 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
)) {
315 * This region has not been initialized yet, do it
317 region_setup
= handler_desc
->address_space
.setup
;
320 /* No initialization routine, exit with error */
323 "No init routine for region(%p) [%s]",
325 acpi_ut_get_region_name(region_obj
->region
.
327 return_ACPI_STATUS(AE_NOT_EXIST
);
331 * We must exit the interpreter because the region
332 * setup will potentially execute control methods
333 * (e.g., _REG method for this region)
335 acpi_ex_exit_interpreter();
337 status
= region_setup(region_obj
, ACPI_REGION_ACTIVATE
,
338 handler_desc
->address_space
.context
,
341 /* Re-enter the interpreter */
343 status2
= acpi_ex_enter_interpreter();
344 if (ACPI_FAILURE(status2
)) {
345 return_ACPI_STATUS(status2
);
348 /* Check for failure of the Region Setup */
350 if (ACPI_FAILURE(status
)) {
351 ACPI_EXCEPTION((AE_INFO
, status
,
352 "During region initialization: [%s]",
353 acpi_ut_get_region_name(region_obj
->
356 return_ACPI_STATUS(status
);
360 * Region initialization may have been completed by region_setup
362 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
)) {
363 region_obj
->region
.flags
|= AOPOBJ_SETUP_COMPLETE
;
365 if (region_obj2
->extra
.region_context
) {
367 /* The handler for this region was already installed */
369 ACPI_MEM_FREE(region_context
);
372 * Save the returned context for use in all accesses to
373 * this particular region
375 region_obj2
->extra
.region_context
=
381 /* We have everything we need, we can invoke the address space handler */
383 handler
= handler_desc
->address_space
.handler
;
385 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
386 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
387 ®ion_obj
->region
.handler
->address_space
, handler
,
388 ACPI_FORMAT_UINT64(address
),
389 acpi_ut_get_region_name(region_obj
->region
.
393 (handler_desc
->address_space
.
394 hflags
& ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
)) {
396 * For handlers other than the default (supplied) handlers, we must
397 * exit the interpreter because the handler *might* block -- we don't
398 * know what it will do, so we can't hold the lock on the intepreter.
400 acpi_ex_exit_interpreter();
403 /* Call the handler */
405 status
= handler(function
, address
, bit_width
, value
,
406 handler_desc
->address_space
.context
,
407 region_obj2
->extra
.region_context
);
409 if (ACPI_FAILURE(status
)) {
410 ACPI_EXCEPTION((AE_INFO
, status
, "Returned by Handler for [%s]",
411 acpi_ut_get_region_name(region_obj
->region
.
416 (handler_desc
->address_space
.
417 hflags
& ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
)) {
419 * We just returned from a non-default handler, we must re-enter the
422 status2
= acpi_ex_enter_interpreter();
423 if (ACPI_FAILURE(status2
)) {
424 return_ACPI_STATUS(status2
);
428 return_ACPI_STATUS(status
);
431 /*******************************************************************************
433 * FUNCTION: acpi_ev_detach_region
435 * PARAMETERS: region_obj - Region Object
436 * acpi_ns_is_locked - Namespace Region Already Locked?
440 * DESCRIPTION: Break the association between the handler and the region
441 * this is a two way association.
443 ******************************************************************************/
446 acpi_ev_detach_region(union acpi_operand_object
*region_obj
,
447 u8 acpi_ns_is_locked
)
449 union acpi_operand_object
*handler_obj
;
450 union acpi_operand_object
*obj_desc
;
451 union acpi_operand_object
**last_obj_ptr
;
452 acpi_adr_space_setup region_setup
;
453 void **region_context
;
454 union acpi_operand_object
*region_obj2
;
457 ACPI_FUNCTION_TRACE("ev_detach_region");
459 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
463 region_context
= ®ion_obj2
->extra
.region_context
;
465 /* Get the address handler from the region object */
467 handler_obj
= region_obj
->region
.handler
;
470 /* This region has no handler, all done */
475 /* Find this region in the handler's list */
477 obj_desc
= handler_obj
->address_space
.region_list
;
478 last_obj_ptr
= &handler_obj
->address_space
.region_list
;
482 /* Is this the correct Region? */
484 if (obj_desc
== region_obj
) {
485 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
486 "Removing Region %p from address handler %p\n",
487 region_obj
, handler_obj
));
489 /* This is it, remove it from the handler's list */
491 *last_obj_ptr
= obj_desc
->region
.next
;
492 obj_desc
->region
.next
= NULL
; /* Must clear field */
494 if (acpi_ns_is_locked
) {
496 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
497 if (ACPI_FAILURE(status
)) {
502 /* Now stop region accesses by executing the _REG method */
504 status
= acpi_ev_execute_reg_method(region_obj
, 0);
505 if (ACPI_FAILURE(status
)) {
506 ACPI_EXCEPTION((AE_INFO
, status
,
507 "from region _REG, [%s]",
508 acpi_ut_get_region_name
509 (region_obj
->region
.space_id
)));
512 if (acpi_ns_is_locked
) {
514 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
515 if (ACPI_FAILURE(status
)) {
520 /* Call the setup handler with the deactivate notification */
522 region_setup
= handler_obj
->address_space
.setup
;
524 region_setup(region_obj
, ACPI_REGION_DEACTIVATE
,
525 handler_obj
->address_space
.context
,
528 /* Init routine may fail, Just ignore errors */
530 if (ACPI_FAILURE(status
)) {
531 ACPI_EXCEPTION((AE_INFO
, status
,
532 "from region init, [%s]",
533 acpi_ut_get_region_name
534 (region_obj
->region
.space_id
)));
537 region_obj
->region
.flags
&= ~(AOPOBJ_SETUP_COMPLETE
);
540 * Remove handler reference in the region
542 * NOTE: this doesn't mean that the region goes away
543 * The region is just inaccessible as indicated to
546 * If the region is on the handler's list
547 * this better be the region's handler
549 region_obj
->region
.handler
= NULL
;
550 acpi_ut_remove_reference(handler_obj
);
555 /* Walk the linked list of handlers */
557 last_obj_ptr
= &obj_desc
->region
.next
;
558 obj_desc
= obj_desc
->region
.next
;
561 /* If we get here, the region was not in the handler's region list */
563 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
564 "Cannot remove region %p from address handler %p\n",
565 region_obj
, handler_obj
));
570 /*******************************************************************************
572 * FUNCTION: acpi_ev_attach_region
574 * PARAMETERS: handler_obj - Handler Object
575 * region_obj - Region Object
576 * acpi_ns_is_locked - Namespace Region Already Locked?
580 * DESCRIPTION: Create the association between the handler and the region
581 * this is a two way association.
583 ******************************************************************************/
586 acpi_ev_attach_region(union acpi_operand_object
*handler_obj
,
587 union acpi_operand_object
*region_obj
,
588 u8 acpi_ns_is_locked
)
591 ACPI_FUNCTION_TRACE("ev_attach_region");
593 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
594 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
595 acpi_ut_get_node_name(region_obj
->region
.node
),
596 region_obj
, handler_obj
,
597 acpi_ut_get_region_name(region_obj
->region
.
600 /* Link this region to the front of the handler's list */
602 region_obj
->region
.next
= handler_obj
->address_space
.region_list
;
603 handler_obj
->address_space
.region_list
= region_obj
;
605 /* Install the region's handler */
607 if (region_obj
->region
.handler
) {
608 return_ACPI_STATUS(AE_ALREADY_EXISTS
);
611 region_obj
->region
.handler
= handler_obj
;
612 acpi_ut_add_reference(handler_obj
);
614 return_ACPI_STATUS(AE_OK
);
617 /*******************************************************************************
619 * FUNCTION: acpi_ev_install_handler
621 * PARAMETERS: walk_namespace callback
623 * DESCRIPTION: This routine installs an address handler into objects that are
624 * of type Region or Device.
626 * If the Object is a Device, and the device has a handler of
627 * the same type then the search is terminated in that branch.
629 * This is because the existing handler is closer in proximity
630 * to any more regions than the one we are trying to install.
632 ******************************************************************************/
635 acpi_ev_install_handler(acpi_handle obj_handle
,
636 u32 level
, void *context
, void **return_value
)
638 union acpi_operand_object
*handler_obj
;
639 union acpi_operand_object
*next_handler_obj
;
640 union acpi_operand_object
*obj_desc
;
641 struct acpi_namespace_node
*node
;
644 ACPI_FUNCTION_NAME("ev_install_handler");
646 handler_obj
= (union acpi_operand_object
*)context
;
648 /* Parameter validation */
654 /* Convert and validate the device handle */
656 node
= acpi_ns_map_handle_to_node(obj_handle
);
658 return (AE_BAD_PARAMETER
);
662 * We only care about regions.and objects
663 * that are allowed to have address space handlers
665 if ((node
->type
!= ACPI_TYPE_DEVICE
) &&
666 (node
->type
!= ACPI_TYPE_REGION
) && (node
!= acpi_gbl_root_node
)) {
670 /* Check for an existing internal object */
672 obj_desc
= acpi_ns_get_attached_object(node
);
675 /* No object, just exit */
680 /* Devices are handled different than regions */
682 if (ACPI_GET_OBJECT_TYPE(obj_desc
) == ACPI_TYPE_DEVICE
) {
684 /* Check if this Device already has a handler for this address space */
686 next_handler_obj
= obj_desc
->device
.handler
;
687 while (next_handler_obj
) {
689 /* Found a handler, is it for the same address space? */
691 if (next_handler_obj
->address_space
.space_id
==
692 handler_obj
->address_space
.space_id
) {
693 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
694 "Found handler for region [%s] in device %p(%p) handler %p\n",
695 acpi_ut_get_region_name
696 (handler_obj
->address_space
.
702 * Since the object we found it on was a device, then it
703 * means that someone has already installed a handler for
704 * the branch of the namespace from this device on. Just
705 * bail out telling the walk routine to not traverse this
706 * branch. This preserves the scoping rule for handlers.
708 return (AE_CTRL_DEPTH
);
711 /* Walk the linked list of handlers attached to this device */
713 next_handler_obj
= next_handler_obj
->address_space
.next
;
717 * As long as the device didn't have a handler for this
718 * space we don't care about it. We just ignore it and
724 /* Object is a Region */
726 if (obj_desc
->region
.space_id
!= handler_obj
->address_space
.space_id
) {
728 * This region is for a different address space
735 * Now we have a region and it is for the handler's address
738 * First disconnect region for any previous handler (if any)
740 acpi_ev_detach_region(obj_desc
, FALSE
);
742 /* Connect the region to the new handler */
744 status
= acpi_ev_attach_region(handler_obj
, obj_desc
, FALSE
);
748 /*******************************************************************************
750 * FUNCTION: acpi_ev_install_space_handler
752 * PARAMETERS: Node - Namespace node for the device
753 * space_id - The address space ID
754 * Handler - Address of the handler
755 * Setup - Address of the setup function
756 * Context - Value passed to the handler on each access
760 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
761 * Assumes namespace is locked
763 ******************************************************************************/
766 acpi_ev_install_space_handler(struct acpi_namespace_node
* node
,
767 acpi_adr_space_type space_id
,
768 acpi_adr_space_handler handler
,
769 acpi_adr_space_setup setup
, void *context
)
771 union acpi_operand_object
*obj_desc
;
772 union acpi_operand_object
*handler_obj
;
774 acpi_object_type type
;
777 ACPI_FUNCTION_TRACE("ev_install_space_handler");
780 * This registration is valid for only the types below
781 * and the root. This is where the default handlers
784 if ((node
->type
!= ACPI_TYPE_DEVICE
) &&
785 (node
->type
!= ACPI_TYPE_PROCESSOR
) &&
786 (node
->type
!= ACPI_TYPE_THERMAL
) && (node
!= acpi_gbl_root_node
)) {
787 status
= AE_BAD_PARAMETER
;
788 goto unlock_and_exit
;
791 if (handler
== ACPI_DEFAULT_HANDLER
) {
792 flags
= ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
;
795 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
796 handler
= acpi_ex_system_memory_space_handler
;
797 setup
= acpi_ev_system_memory_region_setup
;
800 case ACPI_ADR_SPACE_SYSTEM_IO
:
801 handler
= acpi_ex_system_io_space_handler
;
802 setup
= acpi_ev_io_space_region_setup
;
805 case ACPI_ADR_SPACE_PCI_CONFIG
:
806 handler
= acpi_ex_pci_config_space_handler
;
807 setup
= acpi_ev_pci_config_region_setup
;
810 case ACPI_ADR_SPACE_CMOS
:
811 handler
= acpi_ex_cmos_space_handler
;
812 setup
= acpi_ev_cmos_region_setup
;
815 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
816 handler
= acpi_ex_pci_bar_space_handler
;
817 setup
= acpi_ev_pci_bar_region_setup
;
820 case ACPI_ADR_SPACE_DATA_TABLE
:
821 handler
= acpi_ex_data_table_space_handler
;
826 status
= AE_BAD_PARAMETER
;
827 goto unlock_and_exit
;
831 /* If the caller hasn't specified a setup routine, use the default */
834 setup
= acpi_ev_default_region_setup
;
837 /* Check for an existing internal object */
839 obj_desc
= acpi_ns_get_attached_object(node
);
842 * The attached device object already exists.
843 * Make sure the handler is not already installed.
845 handler_obj
= obj_desc
->device
.handler
;
847 /* Walk the handler list for this device */
849 while (handler_obj
) {
851 /* Same space_id indicates a handler already installed */
853 if (handler_obj
->address_space
.space_id
== space_id
) {
854 if (handler_obj
->address_space
.handler
==
857 * It is (relatively) OK to attempt to install the SAME
858 * handler twice. This can easily happen
859 * with PCI_Config space.
861 status
= AE_SAME_HANDLER
;
862 goto unlock_and_exit
;
864 /* A handler is already installed */
866 status
= AE_ALREADY_EXISTS
;
868 goto unlock_and_exit
;
871 /* Walk the linked list of handlers */
873 handler_obj
= handler_obj
->address_space
.next
;
876 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
877 "Creating object on Device %p while installing handler\n",
880 /* obj_desc does not exist, create one */
882 if (node
->type
== ACPI_TYPE_ANY
) {
883 type
= ACPI_TYPE_DEVICE
;
888 obj_desc
= acpi_ut_create_internal_object(type
);
890 status
= AE_NO_MEMORY
;
891 goto unlock_and_exit
;
894 /* Init new descriptor */
896 obj_desc
->common
.type
= (u8
) type
;
898 /* Attach the new object to the Node */
900 status
= acpi_ns_attach_object(node
, obj_desc
, type
);
902 /* Remove local reference to the object */
904 acpi_ut_remove_reference(obj_desc
);
906 if (ACPI_FAILURE(status
)) {
907 goto unlock_and_exit
;
911 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
912 "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
913 acpi_ut_get_region_name(space_id
), space_id
,
914 acpi_ut_get_node_name(node
), node
, obj_desc
));
917 * Install the handler
919 * At this point there is no existing handler.
920 * Just allocate the object for the handler and link it
924 acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER
);
926 status
= AE_NO_MEMORY
;
927 goto unlock_and_exit
;
930 /* Init handler obj */
932 handler_obj
->address_space
.space_id
= (u8
) space_id
;
933 handler_obj
->address_space
.hflags
= flags
;
934 handler_obj
->address_space
.region_list
= NULL
;
935 handler_obj
->address_space
.node
= node
;
936 handler_obj
->address_space
.handler
= handler
;
937 handler_obj
->address_space
.context
= context
;
938 handler_obj
->address_space
.setup
= setup
;
940 /* Install at head of Device.address_space list */
942 handler_obj
->address_space
.next
= obj_desc
->device
.handler
;
945 * The Device object is the first reference on the handler_obj.
946 * Each region that uses the handler adds a reference.
948 obj_desc
->device
.handler
= handler_obj
;
951 * Walk the namespace finding all of the regions this
952 * handler will manage.
954 * Start at the device and search the branch toward
955 * the leaf nodes until either the leaf is encountered or
956 * a device is detected that has an address handler of the
959 * In either case, back up and search down the remainder
962 status
= acpi_ns_walk_namespace(ACPI_TYPE_ANY
, node
, ACPI_UINT32_MAX
,
964 acpi_ev_install_handler
, handler_obj
,
968 return_ACPI_STATUS(status
);
971 /*******************************************************************************
973 * FUNCTION: acpi_ev_execute_reg_methods
975 * PARAMETERS: Node - Namespace node for the device
976 * space_id - The address space ID
980 * DESCRIPTION: Run all _REG methods for the input Space ID;
981 * Note: assumes namespace is locked, or system init time.
983 ******************************************************************************/
986 acpi_ev_execute_reg_methods(struct acpi_namespace_node
*node
,
987 acpi_adr_space_type space_id
)
991 ACPI_FUNCTION_TRACE("ev_execute_reg_methods");
994 * Run all _REG methods for all Operation Regions for this
995 * space ID. This is a separate walk in order to handle any
996 * interdependencies between regions and _REG methods. (i.e. handlers
997 * must be installed for all regions of this Space ID before we
998 * can run any _REG methods)
1000 status
= acpi_ns_walk_namespace(ACPI_TYPE_ANY
, node
, ACPI_UINT32_MAX
,
1001 ACPI_NS_WALK_UNLOCK
, acpi_ev_reg_run
,
1004 return_ACPI_STATUS(status
);
1007 /*******************************************************************************
1009 * FUNCTION: acpi_ev_reg_run
1011 * PARAMETERS: walk_namespace callback
1013 * DESCRIPTION: Run _REg method for region objects of the requested space_iD
1015 ******************************************************************************/
1018 acpi_ev_reg_run(acpi_handle obj_handle
,
1019 u32 level
, void *context
, void **return_value
)
1021 union acpi_operand_object
*obj_desc
;
1022 struct acpi_namespace_node
*node
;
1023 acpi_adr_space_type space_id
;
1026 space_id
= *ACPI_CAST_PTR(acpi_adr_space_type
, context
);
1028 /* Convert and validate the device handle */
1030 node
= acpi_ns_map_handle_to_node(obj_handle
);
1032 return (AE_BAD_PARAMETER
);
1036 * We only care about regions.and objects
1037 * that are allowed to have address space handlers
1039 if ((node
->type
!= ACPI_TYPE_REGION
) && (node
!= acpi_gbl_root_node
)) {
1043 /* Check for an existing internal object */
1045 obj_desc
= acpi_ns_get_attached_object(node
);
1048 /* No object, just exit */
1053 /* Object is a Region */
1055 if (obj_desc
->region
.space_id
!= space_id
) {
1057 * This region is for a different address space
1063 status
= acpi_ev_execute_reg_method(obj_desc
, 1);