1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: evrgnini- ACPI address_space (op_region) init
5 *
6 * Copyright (C) 2000 - 2020, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acevents.h"
13 #include "acnamesp.h"
14 #include "acinterp.h"
15
16 #define _COMPONENT ACPI_EVENTS
17 ACPI_MODULE_NAME("evrgnini")
18
19 /*******************************************************************************
20 *
21 * FUNCTION: acpi_ev_system_memory_region_setup
22 *
23 * PARAMETERS: handle - Region we are interested in
24 * function - Start or stop
25 * handler_context - Address space handler context
26 * region_context - Region specific context
27 *
28 * RETURN: Status
29 *
30 * DESCRIPTION: Setup a system_memory operation region
31 *
32 ******************************************************************************/
33 acpi_status
acpi_ev_system_memory_region_setup(acpi_handle handle,u32 function,void * handler_context,void ** region_context)34 acpi_ev_system_memory_region_setup(acpi_handle handle,
35 u32 function,
36 void *handler_context, void **region_context)
37 {
38 union acpi_operand_object *region_desc =
39 (union acpi_operand_object *)handle;
40 struct acpi_mem_space_context *local_region_context;
41 struct acpi_mem_mapping *mm;
42
43 ACPI_FUNCTION_TRACE(ev_system_memory_region_setup);
44
45 if (function == ACPI_REGION_DEACTIVATE) {
46 if (*region_context) {
47 local_region_context =
48 (struct acpi_mem_space_context *)*region_context;
49
50 /* Delete memory mappings if present */
51
52 while (local_region_context->first_mm) {
53 mm = local_region_context->first_mm;
54 local_region_context->first_mm = mm->next_mm;
55 acpi_os_unmap_memory(mm->logical_address,
56 mm->length);
57 ACPI_FREE(mm);
58 }
59 ACPI_FREE(local_region_context);
60 *region_context = NULL;
61 }
62 return_ACPI_STATUS(AE_OK);
63 }
64
65 /* Create a new context */
66
67 local_region_context =
68 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_mem_space_context));
69 if (!(local_region_context)) {
70 return_ACPI_STATUS(AE_NO_MEMORY);
71 }
72
73 /* Save the region length and address for use in the handler */
74
75 local_region_context->length = region_desc->region.length;
76 local_region_context->address = region_desc->region.address;
77
78 *region_context = local_region_context;
79 return_ACPI_STATUS(AE_OK);
80 }
81
82 /*******************************************************************************
83 *
84 * FUNCTION: acpi_ev_io_space_region_setup
85 *
86 * PARAMETERS: handle - Region we are interested in
87 * function - Start or stop
88 * handler_context - Address space handler context
89 * region_context - Region specific context
90 *
91 * RETURN: Status
92 *
93 * DESCRIPTION: Setup a IO operation region
94 *
95 ******************************************************************************/
96
97 acpi_status
acpi_ev_io_space_region_setup(acpi_handle handle,u32 function,void * handler_context,void ** region_context)98 acpi_ev_io_space_region_setup(acpi_handle handle,
99 u32 function,
100 void *handler_context, void **region_context)
101 {
102 ACPI_FUNCTION_TRACE(ev_io_space_region_setup);
103
104 if (function == ACPI_REGION_DEACTIVATE) {
105 *region_context = NULL;
106 } else {
107 *region_context = handler_context;
108 }
109
110 return_ACPI_STATUS(AE_OK);
111 }
112
113 /*******************************************************************************
114 *
115 * FUNCTION: acpi_ev_pci_config_region_setup
116 *
117 * PARAMETERS: handle - Region we are interested in
118 * function - Start or stop
119 * handler_context - Address space handler context
120 * region_context - Region specific context
121 *
122 * RETURN: Status
123 *
124 * DESCRIPTION: Setup a PCI_Config operation region
125 *
126 * MUTEX: Assumes namespace is not locked
127 *
128 ******************************************************************************/
129
130 acpi_status
acpi_ev_pci_config_region_setup(acpi_handle handle,u32 function,void * handler_context,void ** region_context)131 acpi_ev_pci_config_region_setup(acpi_handle handle,
132 u32 function,
133 void *handler_context, void **region_context)
134 {
135 acpi_status status = AE_OK;
136 u64 pci_value;
137 struct acpi_pci_id *pci_id = *region_context;
138 union acpi_operand_object *handler_obj;
139 struct acpi_namespace_node *parent_node;
140 struct acpi_namespace_node *pci_root_node;
141 struct acpi_namespace_node *pci_device_node;
142 union acpi_operand_object *region_obj =
143 (union acpi_operand_object *)handle;
144
145 ACPI_FUNCTION_TRACE(ev_pci_config_region_setup);
146
147 handler_obj = region_obj->region.handler;
148 if (!handler_obj) {
149 /*
150 * No installed handler. This shouldn't happen because the dispatch
151 * routine checks before we get here, but we check again just in case.
152 */
153 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
154 "Attempting to init a region %p, with no handler\n",
155 region_obj));
156 return_ACPI_STATUS(AE_NOT_EXIST);
157 }
158
159 *region_context = NULL;
160 if (function == ACPI_REGION_DEACTIVATE) {
161 if (pci_id) {
162 ACPI_FREE(pci_id);
163 }
164 return_ACPI_STATUS(status);
165 }
166
167 parent_node = region_obj->region.node->parent;
168
169 /*
170 * Get the _SEG and _BBN values from the device upon which the handler
171 * is installed.
172 *
173 * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
174 * This is the device the handler has been registered to handle.
175 */
176
177 /*
178 * If the address_space.Node is still pointing to the root, we need
179 * to scan upward for a PCI Root bridge and re-associate the op_region
180 * handlers with that device.
181 */
182 if (handler_obj->address_space.node == acpi_gbl_root_node) {
183
184 /* Start search from the parent object */
185
186 pci_root_node = parent_node;
187 while (pci_root_node != acpi_gbl_root_node) {
188
189 /* Get the _HID/_CID in order to detect a root_bridge */
190
191 if (acpi_ev_is_pci_root_bridge(pci_root_node)) {
192
193 /* Install a handler for this PCI root bridge */
194
195 status = acpi_install_address_space_handler((acpi_handle)pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
196 if (ACPI_FAILURE(status)) {
197 if (status == AE_SAME_HANDLER) {
198 /*
199 * It is OK if the handler is already installed on the
200 * root bridge. Still need to return a context object
201 * for the new PCI_Config operation region, however.
202 */
203 } else {
204 ACPI_EXCEPTION((AE_INFO, status,
205 "Could not install PciConfig handler "
206 "for Root Bridge %4.4s",
207 acpi_ut_get_node_name
208 (pci_root_node)));
209 }
210 }
211 break;
212 }
213
214 pci_root_node = pci_root_node->parent;
215 }
216
217 /* PCI root bridge not found, use namespace root node */
218 } else {
219 pci_root_node = handler_obj->address_space.node;
220 }
221
222 /*
223 * If this region is now initialized, we are done.
224 * (install_address_space_handler could have initialized it)
225 */
226 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
227 return_ACPI_STATUS(AE_OK);
228 }
229
230 /* Region is still not initialized. Create a new context */
231
232 pci_id = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pci_id));
233 if (!pci_id) {
234 return_ACPI_STATUS(AE_NO_MEMORY);
235 }
236
237 /*
238 * For PCI_Config space access, we need the segment, bus, device and
239 * function numbers. Acquire them here.
240 *
241 * Find the parent device object. (This allows the operation region to be
242 * within a subscope under the device, such as a control method.)
243 */
244 pci_device_node = region_obj->region.node;
245 while (pci_device_node && (pci_device_node->type != ACPI_TYPE_DEVICE)) {
246 pci_device_node = pci_device_node->parent;
247 }
248
249 if (!pci_device_node) {
250 ACPI_FREE(pci_id);
251 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
252 }
253
254 /*
255 * Get the PCI device and function numbers from the _ADR object
256 * contained in the parent's scope.
257 */
258 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR,
259 pci_device_node, &pci_value);
260
261 /*
262 * The default is zero, and since the allocation above zeroed the data,
263 * just do nothing on failure.
264 */
265 if (ACPI_SUCCESS(status)) {
266 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value));
267 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value));
268 }
269
270 /* The PCI segment number comes from the _SEG method */
271
272 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG,
273 pci_root_node, &pci_value);
274 if (ACPI_SUCCESS(status)) {
275 pci_id->segment = ACPI_LOWORD(pci_value);
276 }
277
278 /* The PCI bus number comes from the _BBN method */
279
280 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN,
281 pci_root_node, &pci_value);
282 if (ACPI_SUCCESS(status)) {
283 pci_id->bus = ACPI_LOWORD(pci_value);
284 }
285
286 /* Complete/update the PCI ID for this device */
287
288 status =
289 acpi_hw_derive_pci_id(pci_id, pci_root_node,
290 region_obj->region.node);
291 if (ACPI_FAILURE(status)) {
292 ACPI_FREE(pci_id);
293 return_ACPI_STATUS(status);
294 }
295
296 *region_context = pci_id;
297 return_ACPI_STATUS(AE_OK);
298 }
299
300 /*******************************************************************************
301 *
302 * FUNCTION: acpi_ev_is_pci_root_bridge
303 *
304 * PARAMETERS: node - Device node being examined
305 *
306 * RETURN: TRUE if device is a PCI/PCI-Express Root Bridge
307 *
308 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
309 * examining the _HID and _CID for the device.
310 *
311 ******************************************************************************/
312
acpi_ev_is_pci_root_bridge(struct acpi_namespace_node * node)313 u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
314 {
315 acpi_status status;
316 struct acpi_pnp_device_id *hid;
317 struct acpi_pnp_device_id_list *cid;
318 u32 i;
319 u8 match;
320
321 /* Get the _HID and check for a PCI Root Bridge */
322
323 status = acpi_ut_execute_HID(node, &hid);
324 if (ACPI_FAILURE(status)) {
325 return (FALSE);
326 }
327
328 match = acpi_ut_is_pci_root_bridge(hid->string);
329 ACPI_FREE(hid);
330
331 if (match) {
332 return (TRUE);
333 }
334
335 /* The _HID did not match. Get the _CID and check for a PCI Root Bridge */
336
337 status = acpi_ut_execute_CID(node, &cid);
338 if (ACPI_FAILURE(status)) {
339 return (FALSE);
340 }
341
342 /* Check all _CIDs in the returned list */
343
344 for (i = 0; i < cid->count; i++) {
345 if (acpi_ut_is_pci_root_bridge(cid->ids[i].string)) {
346 ACPI_FREE(cid);
347 return (TRUE);
348 }
349 }
350
351 ACPI_FREE(cid);
352 return (FALSE);
353 }
354
355 /*******************************************************************************
356 *
357 * FUNCTION: acpi_ev_pci_bar_region_setup
358 *
359 * PARAMETERS: handle - Region we are interested in
360 * function - Start or stop
361 * handler_context - Address space handler context
362 * region_context - Region specific context
363 *
364 * RETURN: Status
365 *
366 * DESCRIPTION: Setup a pci_BAR operation region
367 *
368 * MUTEX: Assumes namespace is not locked
369 *
370 ******************************************************************************/
371
372 acpi_status
acpi_ev_pci_bar_region_setup(acpi_handle handle,u32 function,void * handler_context,void ** region_context)373 acpi_ev_pci_bar_region_setup(acpi_handle handle,
374 u32 function,
375 void *handler_context, void **region_context)
376 {
377 ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup);
378
379 return_ACPI_STATUS(AE_OK);
380 }
381
382 /*******************************************************************************
383 *
384 * FUNCTION: acpi_ev_cmos_region_setup
385 *
386 * PARAMETERS: handle - Region we are interested in
387 * function - Start or stop
388 * handler_context - Address space handler context
389 * region_context - Region specific context
390 *
391 * RETURN: Status
392 *
393 * DESCRIPTION: Setup a CMOS operation region
394 *
395 * MUTEX: Assumes namespace is not locked
396 *
397 ******************************************************************************/
398
399 acpi_status
acpi_ev_cmos_region_setup(acpi_handle handle,u32 function,void * handler_context,void ** region_context)400 acpi_ev_cmos_region_setup(acpi_handle handle,
401 u32 function,
402 void *handler_context, void **region_context)
403 {
404 ACPI_FUNCTION_TRACE(ev_cmos_region_setup);
405
406 return_ACPI_STATUS(AE_OK);
407 }
408
409 /*******************************************************************************
410 *
411 * FUNCTION: acpi_ev_default_region_setup
412 *
413 * PARAMETERS: handle - Region we are interested in
414 * function - Start or stop
415 * handler_context - Address space handler context
416 * region_context - Region specific context
417 *
418 * RETURN: Status
419 *
420 * DESCRIPTION: Default region initialization
421 *
422 ******************************************************************************/
423
424 acpi_status
acpi_ev_default_region_setup(acpi_handle handle,u32 function,void * handler_context,void ** region_context)425 acpi_ev_default_region_setup(acpi_handle handle,
426 u32 function,
427 void *handler_context, void **region_context)
428 {
429 ACPI_FUNCTION_TRACE(ev_default_region_setup);
430
431 if (function == ACPI_REGION_DEACTIVATE) {
432 *region_context = NULL;
433 } else {
434 *region_context = handler_context;
435 }
436
437 return_ACPI_STATUS(AE_OK);
438 }
439
440 /*******************************************************************************
441 *
442 * FUNCTION: acpi_ev_initialize_region
443 *
444 * PARAMETERS: region_obj - Region we are initializing
445 *
446 * RETURN: Status
447 *
448 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
449 * for execution at a later time
450 *
451 * Get the appropriate address space handler for a newly
452 * created region.
453 *
454 * This also performs address space specific initialization. For
455 * example, PCI regions must have an _ADR object that contains
456 * a PCI address in the scope of the definition. This address is
457 * required to perform an access to PCI config space.
458 *
459 * MUTEX: Interpreter should be unlocked, because we may run the _REG
460 * method for this region.
461 *
462 * NOTE: Possible incompliance:
463 * There is a behavior conflict in automatic _REG execution:
464 * 1. When the interpreter is evaluating a method, we can only
465 * automatically run _REG for the following case:
466 * operation_region (OPR1, 0x80, 0x1000010, 0x4)
467 * 2. When the interpreter is loading a table, we can also
468 * automatically run _REG for the following case:
469 * operation_region (OPR1, 0x80, 0x1000010, 0x4)
470 * Though this may not be compliant to the de-facto standard, the
471 * logic is kept in order not to trigger regressions. And keeping
472 * this logic should be taken care by the caller of this function.
473 *
474 ******************************************************************************/
475
acpi_ev_initialize_region(union acpi_operand_object * region_obj)476 acpi_status acpi_ev_initialize_region(union acpi_operand_object *region_obj)
477 {
478 union acpi_operand_object *handler_obj;
479 union acpi_operand_object *obj_desc;
480 acpi_adr_space_type space_id;
481 struct acpi_namespace_node *node;
482
483 ACPI_FUNCTION_TRACE(ev_initialize_region);
484
485 if (!region_obj) {
486 return_ACPI_STATUS(AE_BAD_PARAMETER);
487 }
488
489 if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
490 return_ACPI_STATUS(AE_OK);
491 }
492
493 region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
494
495 node = region_obj->region.node->parent;
496 space_id = region_obj->region.space_id;
497
498 /*
499 * The following loop depends upon the root Node having no parent
500 * ie: acpi_gbl_root_node->Parent being set to NULL
501 */
502 while (node) {
503
504 /* Check to see if a handler exists */
505
506 handler_obj = NULL;
507 obj_desc = acpi_ns_get_attached_object(node);
508 if (obj_desc) {
509
510 /* Can only be a handler if the object exists */
511
512 switch (node->type) {
513 case ACPI_TYPE_DEVICE:
514 case ACPI_TYPE_PROCESSOR:
515 case ACPI_TYPE_THERMAL:
516
517 handler_obj = obj_desc->common_notify.handler;
518 break;
519
520 default:
521
522 /* Ignore other objects */
523
524 break;
525 }
526
527 handler_obj =
528 acpi_ev_find_region_handler(space_id, handler_obj);
529 if (handler_obj) {
530
531 /* Found correct handler */
532
533 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
534 "Found handler %p for region %p in obj %p\n",
535 handler_obj, region_obj,
536 obj_desc));
537
538 (void)acpi_ev_attach_region(handler_obj,
539 region_obj, FALSE);
540
541 /*
542 * Tell all users that this region is usable by
543 * running the _REG method
544 */
545 acpi_ex_exit_interpreter();
546 (void)acpi_ev_execute_reg_method(region_obj,
547 ACPI_REG_CONNECT);
548 acpi_ex_enter_interpreter();
549 return_ACPI_STATUS(AE_OK);
550 }
551 }
552
553 /* This node does not have the handler we need; Pop up one level */
554
555 node = node->parent;
556 }
557
558 /*
559 * If we get here, there is no handler for this region. This is not
560 * fatal because many regions get created before a handler is installed
561 * for said region.
562 */
563 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
564 "No handler for RegionType %s(%X) (RegionObj %p)\n",
565 acpi_ut_get_region_name(space_id), space_id,
566 region_obj));
567
568 return_ACPI_STATUS(AE_OK);
569 }
570