[PATCH] cfq-iosched: fix crash in do_div()
[linux-2.6.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 - 2006, 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/acevents.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acinterp.h>
48
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
57 };
58
59 /* Local prototypes */
60
61 static acpi_status
62 acpi_ev_reg_run(acpi_handle obj_handle,
63                 u32 level, void *context, void **return_value);
64
65 static acpi_status
66 acpi_ev_install_handler(acpi_handle obj_handle,
67                         u32 level, void *context, void **return_value);
68
69 /*******************************************************************************
70  *
71  * FUNCTION:    acpi_ev_install_region_handlers
72  *
73  * PARAMETERS:  None
74  *
75  * RETURN:      Status
76  *
77  * DESCRIPTION: Installs the core subsystem default address space handlers.
78  *
79  ******************************************************************************/
80
81 acpi_status acpi_ev_install_region_handlers(void)
82 {
83         acpi_status status;
84         acpi_native_uint i;
85
86         ACPI_FUNCTION_TRACE("ev_install_region_handlers");
87
88         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
89         if (ACPI_FAILURE(status)) {
90                 return_ACPI_STATUS(status);
91         }
92
93         /*
94          * All address spaces (PCI Config, EC, SMBus) are scope dependent
95          * and registration must occur for a specific device.
96          *
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.
99          *
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.
106          *
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.
110          */
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
114                                                        [i],
115                                                        ACPI_DEFAULT_HANDLER,
116                                                        NULL, NULL);
117                 switch (status) {
118                 case AE_OK:
119                 case AE_SAME_HANDLER:
120                 case AE_ALREADY_EXISTS:
121
122                         /* These exceptions are all OK */
123
124                         status = AE_OK;
125                         break;
126
127                 default:
128
129                         goto unlock_and_exit;
130                 }
131         }
132
133       unlock_and_exit:
134         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
135         return_ACPI_STATUS(status);
136 }
137
138 /*******************************************************************************
139  *
140  * FUNCTION:    acpi_ev_initialize_op_regions
141  *
142  * PARAMETERS:  None
143  *
144  * RETURN:      Status
145  *
146  * DESCRIPTION: Execute _REG methods for all Operation Regions that have
147  *              an installed default region handler.
148  *
149  ******************************************************************************/
150
151 acpi_status acpi_ev_initialize_op_regions(void)
152 {
153         acpi_status status;
154         acpi_native_uint i;
155
156         ACPI_FUNCTION_TRACE("ev_initialize_op_regions");
157
158         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
159         if (ACPI_FAILURE(status)) {
160                 return_ACPI_STATUS(status);
161         }
162
163         /*
164          * Run the _REG methods for op_regions in each default address space
165          */
166         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
167                 /* TBD: Make sure handler is the DEFAULT handler, otherwise
168                  * _REG will have already been run.
169                  */
170                 status = acpi_ev_execute_reg_methods(acpi_gbl_root_node,
171                                                      acpi_gbl_default_address_spaces
172                                                      [i]);
173         }
174
175         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
176         return_ACPI_STATUS(status);
177 }
178
179 /*******************************************************************************
180  *
181  * FUNCTION:    acpi_ev_execute_reg_method
182  *
183  * PARAMETERS:  region_obj          - Region object
184  *              Function            - Passed to _REG: On (1) or Off (0)
185  *
186  * RETURN:      Status
187  *
188  * DESCRIPTION: Execute _REG method for a region
189  *
190  ******************************************************************************/
191
192 acpi_status
193 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
194 {
195         struct acpi_parameter_info info;
196         union acpi_operand_object *params[3];
197         union acpi_operand_object *region_obj2;
198         acpi_status status;
199
200         ACPI_FUNCTION_TRACE("ev_execute_reg_method");
201
202         region_obj2 = acpi_ns_get_secondary_object(region_obj);
203         if (!region_obj2) {
204                 return_ACPI_STATUS(AE_NOT_EXIST);
205         }
206
207         if (region_obj2->extra.method_REG == NULL) {
208                 return_ACPI_STATUS(AE_OK);
209         }
210
211         /*
212          * The _REG method has two arguments:
213          *
214          * Arg0, Integer: Operation region space ID
215          *          Same value as region_obj->Region.space_id
216          * Arg1, Integer: connection status
217          *          1 for connecting the handler,
218          *          0 for disconnecting the handler
219          *          Passed as a parameter
220          */
221         params[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
222         if (!params[0]) {
223                 return_ACPI_STATUS(AE_NO_MEMORY);
224         }
225
226         params[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
227         if (!params[1]) {
228                 status = AE_NO_MEMORY;
229                 goto cleanup;
230         }
231
232         /* Setup the parameter objects */
233
234         params[0]->integer.value = region_obj->region.space_id;
235         params[1]->integer.value = function;
236         params[2] = NULL;
237
238         info.node = region_obj2->extra.method_REG;
239         info.parameters = params;
240         info.parameter_type = ACPI_PARAM_ARGS;
241
242         /* Execute the method, no return value */
243
244         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
245                         (ACPI_TYPE_METHOD, info.node, NULL));
246         status = acpi_ns_evaluate_by_handle(&info);
247
248         acpi_ut_remove_reference(params[1]);
249
250       cleanup:
251         acpi_ut_remove_reference(params[0]);
252
253         return_ACPI_STATUS(status);
254 }
255
256 /*******************************************************************************
257  *
258  * FUNCTION:    acpi_ev_address_space_dispatch
259  *
260  * PARAMETERS:  region_obj          - Internal region object
261  *              Function            - Read or Write operation
262  *              Address             - Where in the space to read or write
263  *              bit_width           - Field width in bits (8, 16, 32, or 64)
264  *              Value               - Pointer to in or out value
265  *
266  * RETURN:      Status
267  *
268  * DESCRIPTION: Dispatch an address space or operation region access to
269  *              a previously installed handler.
270  *
271  ******************************************************************************/
272
273 acpi_status
274 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
275                                u32 function,
276                                acpi_physical_address address,
277                                u32 bit_width, void *value)
278 {
279         acpi_status status;
280         acpi_status status2;
281         acpi_adr_space_handler handler;
282         acpi_adr_space_setup region_setup;
283         union acpi_operand_object *handler_desc;
284         union acpi_operand_object *region_obj2;
285         void *region_context = NULL;
286
287         ACPI_FUNCTION_TRACE("ev_address_space_dispatch");
288
289         region_obj2 = acpi_ns_get_secondary_object(region_obj);
290         if (!region_obj2) {
291                 return_ACPI_STATUS(AE_NOT_EXIST);
292         }
293
294         /* Ensure that there is a handler associated with this region */
295
296         handler_desc = region_obj->region.handler;
297         if (!handler_desc) {
298                 ACPI_ERROR((AE_INFO,
299                             "No handler for Region [%4.4s] (%p) [%s]",
300                             acpi_ut_get_node_name(region_obj->region.node),
301                             region_obj,
302                             acpi_ut_get_region_name(region_obj->region.
303                                                     space_id)));
304
305                 return_ACPI_STATUS(AE_NOT_EXIST);
306         }
307
308         /*
309          * It may be the case that the region has never been initialized
310          * Some types of regions require special init code
311          */
312         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
313                 /*
314                  * This region has not been initialized yet, do it
315                  */
316                 region_setup = handler_desc->address_space.setup;
317                 if (!region_setup) {
318                         /* No initialization routine, exit with error */
319
320                         ACPI_ERROR((AE_INFO,
321                                     "No init routine for region(%p) [%s]",
322                                     region_obj,
323                                     acpi_ut_get_region_name(region_obj->region.
324                                                             space_id)));
325                         return_ACPI_STATUS(AE_NOT_EXIST);
326                 }
327
328                 /*
329                  * We must exit the interpreter because the region
330                  * setup will potentially execute control methods
331                  * (e.g., _REG method for this region)
332                  */
333                 acpi_ex_exit_interpreter();
334
335                 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
336                                       handler_desc->address_space.context,
337                                       &region_context);
338
339                 /* Re-enter the interpreter */
340
341                 status2 = acpi_ex_enter_interpreter();
342                 if (ACPI_FAILURE(status2)) {
343                         return_ACPI_STATUS(status2);
344                 }
345
346                 /* Check for failure of the Region Setup */
347
348                 if (ACPI_FAILURE(status)) {
349                         ACPI_EXCEPTION((AE_INFO, status,
350                                         "During region initialization: [%s]",
351                                         acpi_ut_get_region_name(region_obj->
352                                                                 region.
353                                                                 space_id)));
354                         return_ACPI_STATUS(status);
355                 }
356
357                 /*
358                  * Region initialization may have been completed by region_setup
359                  */
360                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
361                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
362
363                         if (region_obj2->extra.region_context) {
364                                 /* The handler for this region was already installed */
365
366                                 ACPI_MEM_FREE(region_context);
367                         } else {
368                                 /*
369                                  * Save the returned context for use in all accesses to
370                                  * this particular region
371                                  */
372                                 region_obj2->extra.region_context =
373                                     region_context;
374                         }
375                 }
376         }
377
378         /* We have everything we need, we can invoke the address space handler */
379
380         handler = handler_desc->address_space.handler;
381
382         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
383                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
384                           &region_obj->region.handler->address_space, handler,
385                           ACPI_FORMAT_UINT64(address),
386                           acpi_ut_get_region_name(region_obj->region.
387                                                   space_id)));
388
389         if (!
390             (handler_desc->address_space.
391              hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
392                 /*
393                  * For handlers other than the default (supplied) handlers, we must
394                  * exit the interpreter because the handler *might* block -- we don't
395                  * know what it will do, so we can't hold the lock on the intepreter.
396                  */
397                 acpi_ex_exit_interpreter();
398         }
399
400         /* Call the handler */
401
402         status = handler(function, address, bit_width, value,
403                          handler_desc->address_space.context,
404                          region_obj2->extra.region_context);
405
406         if (ACPI_FAILURE(status)) {
407                 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
408                                 acpi_ut_get_region_name(region_obj->region.
409                                                         space_id)));
410         }
411
412         if (!
413             (handler_desc->address_space.
414              hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
415                 /*
416                  * We just returned from a non-default handler, we must re-enter the
417                  * interpreter
418                  */
419                 status2 = acpi_ex_enter_interpreter();
420                 if (ACPI_FAILURE(status2)) {
421                         return_ACPI_STATUS(status2);
422                 }
423         }
424
425         return_ACPI_STATUS(status);
426 }
427
428 /*******************************************************************************
429  *
430  * FUNCTION:    acpi_ev_detach_region
431  *
432  * PARAMETERS:  region_obj          - Region Object
433  *              acpi_ns_is_locked   - Namespace Region Already Locked?
434  *
435  * RETURN:      None
436  *
437  * DESCRIPTION: Break the association between the handler and the region
438  *              this is a two way association.
439  *
440  ******************************************************************************/
441
442 void
443 acpi_ev_detach_region(union acpi_operand_object *region_obj,
444                       u8 acpi_ns_is_locked)
445 {
446         union acpi_operand_object *handler_obj;
447         union acpi_operand_object *obj_desc;
448         union acpi_operand_object **last_obj_ptr;
449         acpi_adr_space_setup region_setup;
450         void **region_context;
451         union acpi_operand_object *region_obj2;
452         acpi_status status;
453
454         ACPI_FUNCTION_TRACE("ev_detach_region");
455
456         region_obj2 = acpi_ns_get_secondary_object(region_obj);
457         if (!region_obj2) {
458                 return_VOID;
459         }
460         region_context = &region_obj2->extra.region_context;
461
462         /* Get the address handler from the region object */
463
464         handler_obj = region_obj->region.handler;
465         if (!handler_obj) {
466                 /* This region has no handler, all done */
467
468                 return_VOID;
469         }
470
471         /* Find this region in the handler's list */
472
473         obj_desc = handler_obj->address_space.region_list;
474         last_obj_ptr = &handler_obj->address_space.region_list;
475
476         while (obj_desc) {
477                 /* Is this the correct Region? */
478
479                 if (obj_desc == region_obj) {
480                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
481                                           "Removing Region %p from address handler %p\n",
482                                           region_obj, handler_obj));
483
484                         /* This is it, remove it from the handler's list */
485
486                         *last_obj_ptr = obj_desc->region.next;
487                         obj_desc->region.next = NULL;   /* Must clear field */
488
489                         if (acpi_ns_is_locked) {
490                                 status =
491                                     acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
492                                 if (ACPI_FAILURE(status)) {
493                                         return_VOID;
494                                 }
495                         }
496
497                         /* Now stop region accesses by executing the _REG method */
498
499                         status = acpi_ev_execute_reg_method(region_obj, 0);
500                         if (ACPI_FAILURE(status)) {
501                                 ACPI_EXCEPTION((AE_INFO, status,
502                                                 "from region _REG, [%s]",
503                                                 acpi_ut_get_region_name
504                                                 (region_obj->region.space_id)));
505                         }
506
507                         if (acpi_ns_is_locked) {
508                                 status =
509                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
510                                 if (ACPI_FAILURE(status)) {
511                                         return_VOID;
512                                 }
513                         }
514
515                         /* Call the setup handler with the deactivate notification */
516
517                         region_setup = handler_obj->address_space.setup;
518                         status =
519                             region_setup(region_obj, ACPI_REGION_DEACTIVATE,
520                                          handler_obj->address_space.context,
521                                          region_context);
522
523                         /* Init routine may fail, Just ignore errors */
524
525                         if (ACPI_FAILURE(status)) {
526                                 ACPI_EXCEPTION((AE_INFO, status,
527                                                 "from region init, [%s]",
528                                                 acpi_ut_get_region_name
529                                                 (region_obj->region.space_id)));
530                         }
531
532                         region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
533
534                         /*
535                          * Remove handler reference in the region
536                          *
537                          * NOTE: this doesn't mean that the region goes away
538                          * The region is just inaccessible as indicated to
539                          * the _REG method
540                          *
541                          * If the region is on the handler's list
542                          * this better be the region's handler
543                          */
544                         region_obj->region.handler = NULL;
545                         acpi_ut_remove_reference(handler_obj);
546
547                         return_VOID;
548                 }
549
550                 /* Walk the linked list of handlers */
551
552                 last_obj_ptr = &obj_desc->region.next;
553                 obj_desc = obj_desc->region.next;
554         }
555
556         /* If we get here, the region was not in the handler's region list */
557
558         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
559                           "Cannot remove region %p from address handler %p\n",
560                           region_obj, handler_obj));
561
562         return_VOID;
563 }
564
565 /*******************************************************************************
566  *
567  * FUNCTION:    acpi_ev_attach_region
568  *
569  * PARAMETERS:  handler_obj         - Handler Object
570  *              region_obj          - Region Object
571  *              acpi_ns_is_locked   - Namespace Region Already Locked?
572  *
573  * RETURN:      None
574  *
575  * DESCRIPTION: Create the association between the handler and the region
576  *              this is a two way association.
577  *
578  ******************************************************************************/
579
580 acpi_status
581 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
582                       union acpi_operand_object *region_obj,
583                       u8 acpi_ns_is_locked)
584 {
585
586         ACPI_FUNCTION_TRACE("ev_attach_region");
587
588         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
589                           "Adding Region [%4.4s] %p to address handler %p [%s]\n",
590                           acpi_ut_get_node_name(region_obj->region.node),
591                           region_obj, handler_obj,
592                           acpi_ut_get_region_name(region_obj->region.
593                                                   space_id)));
594
595         /* Link this region to the front of the handler's list */
596
597         region_obj->region.next = handler_obj->address_space.region_list;
598         handler_obj->address_space.region_list = region_obj;
599
600         /* Install the region's handler */
601
602         if (region_obj->region.handler) {
603                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
604         }
605
606         region_obj->region.handler = handler_obj;
607         acpi_ut_add_reference(handler_obj);
608
609         return_ACPI_STATUS(AE_OK);
610 }
611
612 /*******************************************************************************
613  *
614  * FUNCTION:    acpi_ev_install_handler
615  *
616  * PARAMETERS:  walk_namespace callback
617  *
618  * DESCRIPTION: This routine installs an address handler into objects that are
619  *              of type Region or Device.
620  *
621  *              If the Object is a Device, and the device has a handler of
622  *              the same type then the search is terminated in that branch.
623  *
624  *              This is because the existing handler is closer in proximity
625  *              to any more regions than the one we are trying to install.
626  *
627  ******************************************************************************/
628
629 static acpi_status
630 acpi_ev_install_handler(acpi_handle obj_handle,
631                         u32 level, void *context, void **return_value)
632 {
633         union acpi_operand_object *handler_obj;
634         union acpi_operand_object *next_handler_obj;
635         union acpi_operand_object *obj_desc;
636         struct acpi_namespace_node *node;
637         acpi_status status;
638
639         ACPI_FUNCTION_NAME("ev_install_handler");
640
641         handler_obj = (union acpi_operand_object *)context;
642
643         /* Parameter validation */
644
645         if (!handler_obj) {
646                 return (AE_OK);
647         }
648
649         /* Convert and validate the device handle */
650
651         node = acpi_ns_map_handle_to_node(obj_handle);
652         if (!node) {
653                 return (AE_BAD_PARAMETER);
654         }
655
656         /*
657          * We only care about regions.and objects
658          * that are allowed to have address space handlers
659          */
660         if ((node->type != ACPI_TYPE_DEVICE) &&
661             (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
662                 return (AE_OK);
663         }
664
665         /* Check for an existing internal object */
666
667         obj_desc = acpi_ns_get_attached_object(node);
668         if (!obj_desc) {
669                 /* No object, just exit */
670
671                 return (AE_OK);
672         }
673
674         /* Devices are handled different than regions */
675
676         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
677                 /* Check if this Device already has a handler for this address space */
678
679                 next_handler_obj = obj_desc->device.handler;
680                 while (next_handler_obj) {
681                         /* Found a handler, is it for the same address space? */
682
683                         if (next_handler_obj->address_space.space_id ==
684                             handler_obj->address_space.space_id) {
685                                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
686                                                   "Found handler for region [%s] in device %p(%p) handler %p\n",
687                                                   acpi_ut_get_region_name
688                                                   (handler_obj->address_space.
689                                                    space_id), obj_desc,
690                                                   next_handler_obj,
691                                                   handler_obj));
692
693                                 /*
694                                  * Since the object we found it on was a device, then it
695                                  * means that someone has already installed a handler for
696                                  * the branch of the namespace from this device on.  Just
697                                  * bail out telling the walk routine to not traverse this
698                                  * branch.  This preserves the scoping rule for handlers.
699                                  */
700                                 return (AE_CTRL_DEPTH);
701                         }
702
703                         /* Walk the linked list of handlers attached to this device */
704
705                         next_handler_obj = next_handler_obj->address_space.next;
706                 }
707
708                 /*
709                  * As long as the device didn't have a handler for this
710                  * space we don't care about it.  We just ignore it and
711                  * proceed.
712                  */
713                 return (AE_OK);
714         }
715
716         /* Object is a Region */
717
718         if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
719                 /*
720                  * This region is for a different address space
721                  * -- just ignore it
722                  */
723                 return (AE_OK);
724         }
725
726         /*
727          * Now we have a region and it is for the handler's address
728          * space type.
729          *
730          * First disconnect region for any previous handler (if any)
731          */
732         acpi_ev_detach_region(obj_desc, FALSE);
733
734         /* Connect the region to the new handler */
735
736         status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
737         return (status);
738 }
739
740 /*******************************************************************************
741  *
742  * FUNCTION:    acpi_ev_install_space_handler
743  *
744  * PARAMETERS:  Node            - Namespace node for the device
745  *              space_id        - The address space ID
746  *              Handler         - Address of the handler
747  *              Setup           - Address of the setup function
748  *              Context         - Value passed to the handler on each access
749  *
750  * RETURN:      Status
751  *
752  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
753  *              Assumes namespace is locked
754  *
755  ******************************************************************************/
756
757 acpi_status
758 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
759                               acpi_adr_space_type space_id,
760                               acpi_adr_space_handler handler,
761                               acpi_adr_space_setup setup, void *context)
762 {
763         union acpi_operand_object *obj_desc;
764         union acpi_operand_object *handler_obj;
765         acpi_status status;
766         acpi_object_type type;
767         u16 flags = 0;
768
769         ACPI_FUNCTION_TRACE("ev_install_space_handler");
770
771         /*
772          * This registration is valid for only the types below
773          * and the root.  This is where the default handlers
774          * get placed.
775          */
776         if ((node->type != ACPI_TYPE_DEVICE) &&
777             (node->type != ACPI_TYPE_PROCESSOR) &&
778             (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
779                 status = AE_BAD_PARAMETER;
780                 goto unlock_and_exit;
781         }
782
783         if (handler == ACPI_DEFAULT_HANDLER) {
784                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
785
786                 switch (space_id) {
787                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
788                         handler = acpi_ex_system_memory_space_handler;
789                         setup = acpi_ev_system_memory_region_setup;
790                         break;
791
792                 case ACPI_ADR_SPACE_SYSTEM_IO:
793                         handler = acpi_ex_system_io_space_handler;
794                         setup = acpi_ev_io_space_region_setup;
795                         break;
796
797                 case ACPI_ADR_SPACE_PCI_CONFIG:
798                         handler = acpi_ex_pci_config_space_handler;
799                         setup = acpi_ev_pci_config_region_setup;
800                         break;
801
802                 case ACPI_ADR_SPACE_CMOS:
803                         handler = acpi_ex_cmos_space_handler;
804                         setup = acpi_ev_cmos_region_setup;
805                         break;
806
807                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
808                         handler = acpi_ex_pci_bar_space_handler;
809                         setup = acpi_ev_pci_bar_region_setup;
810                         break;
811
812                 case ACPI_ADR_SPACE_DATA_TABLE:
813                         handler = acpi_ex_data_table_space_handler;
814                         setup = NULL;
815                         break;
816
817                 default:
818                         status = AE_BAD_PARAMETER;
819                         goto unlock_and_exit;
820                 }
821         }
822
823         /* If the caller hasn't specified a setup routine, use the default */
824
825         if (!setup) {
826                 setup = acpi_ev_default_region_setup;
827         }
828
829         /* Check for an existing internal object */
830
831         obj_desc = acpi_ns_get_attached_object(node);
832         if (obj_desc) {
833                 /*
834                  * The attached device object already exists.
835                  * Make sure the handler is not already installed.
836                  */
837                 handler_obj = obj_desc->device.handler;
838
839                 /* Walk the handler list for this device */
840
841                 while (handler_obj) {
842                         /* Same space_id indicates a handler already installed */
843
844                         if (handler_obj->address_space.space_id == space_id) {
845                                 if (handler_obj->address_space.handler ==
846                                     handler) {
847                                         /*
848                                          * It is (relatively) OK to attempt to install the SAME
849                                          * handler twice. This can easily happen
850                                          * with PCI_Config space.
851                                          */
852                                         status = AE_SAME_HANDLER;
853                                         goto unlock_and_exit;
854                                 } else {
855                                         /* A handler is already installed */
856
857                                         status = AE_ALREADY_EXISTS;
858                                 }
859                                 goto unlock_and_exit;
860                         }
861
862                         /* Walk the linked list of handlers */
863
864                         handler_obj = handler_obj->address_space.next;
865                 }
866         } else {
867                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
868                                   "Creating object on Device %p while installing handler\n",
869                                   node));
870
871                 /* obj_desc does not exist, create one */
872
873                 if (node->type == ACPI_TYPE_ANY) {
874                         type = ACPI_TYPE_DEVICE;
875                 } else {
876                         type = node->type;
877                 }
878
879                 obj_desc = acpi_ut_create_internal_object(type);
880                 if (!obj_desc) {
881                         status = AE_NO_MEMORY;
882                         goto unlock_and_exit;
883                 }
884
885                 /* Init new descriptor */
886
887                 obj_desc->common.type = (u8) type;
888
889                 /* Attach the new object to the Node */
890
891                 status = acpi_ns_attach_object(node, obj_desc, type);
892
893                 /* Remove local reference to the object */
894
895                 acpi_ut_remove_reference(obj_desc);
896
897                 if (ACPI_FAILURE(status)) {
898                         goto unlock_and_exit;
899                 }
900         }
901
902         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
903                           "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
904                           acpi_ut_get_region_name(space_id), space_id,
905                           acpi_ut_get_node_name(node), node, obj_desc));
906
907         /*
908          * Install the handler
909          *
910          * At this point there is no existing handler.
911          * Just allocate the object for the handler and link it
912          * into the list.
913          */
914         handler_obj =
915             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
916         if (!handler_obj) {
917                 status = AE_NO_MEMORY;
918                 goto unlock_and_exit;
919         }
920
921         /* Init handler obj */
922
923         handler_obj->address_space.space_id = (u8) space_id;
924         handler_obj->address_space.hflags = flags;
925         handler_obj->address_space.region_list = NULL;
926         handler_obj->address_space.node = node;
927         handler_obj->address_space.handler = handler;
928         handler_obj->address_space.context = context;
929         handler_obj->address_space.setup = setup;
930
931         /* Install at head of Device.address_space list */
932
933         handler_obj->address_space.next = obj_desc->device.handler;
934
935         /*
936          * The Device object is the first reference on the handler_obj.
937          * Each region that uses the handler adds a reference.
938          */
939         obj_desc->device.handler = handler_obj;
940
941         /*
942          * Walk the namespace finding all of the regions this
943          * handler will manage.
944          *
945          * Start at the device and search the branch toward
946          * the leaf nodes until either the leaf is encountered or
947          * a device is detected that has an address handler of the
948          * same type.
949          *
950          * In either case, back up and search down the remainder
951          * of the branch
952          */
953         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
954                                         ACPI_NS_WALK_UNLOCK,
955                                         acpi_ev_install_handler, handler_obj,
956                                         NULL);
957
958       unlock_and_exit:
959         return_ACPI_STATUS(status);
960 }
961
962 /*******************************************************************************
963  *
964  * FUNCTION:    acpi_ev_execute_reg_methods
965  *
966  * PARAMETERS:  Node            - Namespace node for the device
967  *              space_id        - The address space ID
968  *
969  * RETURN:      Status
970  *
971  * DESCRIPTION: Run all _REG methods for the input Space ID;
972  *              Note: assumes namespace is locked, or system init time.
973  *
974  ******************************************************************************/
975
976 acpi_status
977 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
978                             acpi_adr_space_type space_id)
979 {
980         acpi_status status;
981
982         ACPI_FUNCTION_TRACE("ev_execute_reg_methods");
983
984         /*
985          * Run all _REG methods for all Operation Regions for this
986          * space ID.  This is a separate walk in order to handle any
987          * interdependencies between regions and _REG methods.  (i.e. handlers
988          * must be installed for all regions of this Space ID before we
989          * can run any _REG methods)
990          */
991         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
992                                         ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
993                                         &space_id, NULL);
994
995         return_ACPI_STATUS(status);
996 }
997
998 /*******************************************************************************
999  *
1000  * FUNCTION:    acpi_ev_reg_run
1001  *
1002  * PARAMETERS:  walk_namespace callback
1003  *
1004  * DESCRIPTION: Run _REg method for region objects of the requested space_iD
1005  *
1006  ******************************************************************************/
1007
1008 static acpi_status
1009 acpi_ev_reg_run(acpi_handle obj_handle,
1010                 u32 level, void *context, void **return_value)
1011 {
1012         union acpi_operand_object *obj_desc;
1013         struct acpi_namespace_node *node;
1014         acpi_adr_space_type space_id;
1015         acpi_status status;
1016
1017         space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1018
1019         /* Convert and validate the device handle */
1020
1021         node = acpi_ns_map_handle_to_node(obj_handle);
1022         if (!node) {
1023                 return (AE_BAD_PARAMETER);
1024         }
1025
1026         /*
1027          * We only care about regions.and objects
1028          * that are allowed to have address space handlers
1029          */
1030         if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1031                 return (AE_OK);
1032         }
1033
1034         /* Check for an existing internal object */
1035
1036         obj_desc = acpi_ns_get_attached_object(node);
1037         if (!obj_desc) {
1038                 /* No object, just exit */
1039
1040                 return (AE_OK);
1041         }
1042
1043         /* Object is a Region */
1044
1045         if (obj_desc->region.space_id != space_id) {
1046                 /*
1047                  * This region is for a different address space
1048                  * -- just ignore it
1049                  */
1050                 return (AE_OK);
1051         }
1052
1053         status = acpi_ev_execute_reg_method(obj_desc, 1);
1054         return (status);
1055 }