1 /*******************************************************************************
3 * Module Name: rsxface - Public interfaces to the resource manager
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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
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44 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_RESOURCES
50 ACPI_MODULE_NAME("rsxface")
52 /* Local macros for 16,32-bit to 64-bit conversion */
53 #define ACPI_COPY_FIELD(out, in, field) ((out)->field = (in)->field)
54 #define ACPI_COPY_ADDRESS(out, in) \
55 ACPI_COPY_FIELD(out, in, resource_type); \
56 ACPI_COPY_FIELD(out, in, producer_consumer); \
57 ACPI_COPY_FIELD(out, in, decode); \
58 ACPI_COPY_FIELD(out, in, min_address_fixed); \
59 ACPI_COPY_FIELD(out, in, max_address_fixed); \
60 ACPI_COPY_FIELD(out, in, info); \
61 ACPI_COPY_FIELD(out, in, granularity); \
62 ACPI_COPY_FIELD(out, in, minimum); \
63 ACPI_COPY_FIELD(out, in, maximum); \
64 ACPI_COPY_FIELD(out, in, translation_offset); \
65 ACPI_COPY_FIELD(out, in, address_length); \
66 ACPI_COPY_FIELD(out, in, resource_source);
67 /* Local prototypes */
69 acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context);
72 acpi_rs_validate_parameters(acpi_handle device_handle,
73 struct acpi_buffer *buffer,
74 struct acpi_namespace_node **return_node);
76 /*******************************************************************************
78 * FUNCTION: acpi_rs_validate_parameters
80 * PARAMETERS: device_handle - Handle to a device
81 * Buffer - Pointer to a data buffer
82 * return_node - Pointer to where the device node is returned
86 * DESCRIPTION: Common parameter validation for resource interfaces
88 ******************************************************************************/
91 acpi_rs_validate_parameters(acpi_handle device_handle,
92 struct acpi_buffer *buffer,
93 struct acpi_namespace_node **return_node)
96 struct acpi_namespace_node *node;
98 ACPI_FUNCTION_TRACE(rs_validate_parameters);
101 * Must have a valid handle to an ACPI device
103 if (!device_handle) {
104 return_ACPI_STATUS(AE_BAD_PARAMETER);
107 node = acpi_ns_map_handle_to_node(device_handle);
109 return_ACPI_STATUS(AE_BAD_PARAMETER);
112 if (node->type != ACPI_TYPE_DEVICE) {
113 return_ACPI_STATUS(AE_TYPE);
117 * Validate the user buffer object
119 * if there is a non-zero buffer length we also need a valid pointer in
120 * the buffer. If it's a zero buffer length, we'll be returning the
121 * needed buffer size (later), so keep going.
123 status = acpi_ut_validate_buffer(buffer);
124 if (ACPI_FAILURE(status)) {
125 return_ACPI_STATUS(status);
129 return_ACPI_STATUS(AE_OK);
132 /*******************************************************************************
134 * FUNCTION: acpi_get_irq_routing_table
136 * PARAMETERS: device_handle - Handle to the Bus device we are querying
137 * ret_buffer - Pointer to a buffer to receive the
138 * current resources for the device
142 * DESCRIPTION: This function is called to get the IRQ routing table for a
143 * specific bus. The caller must first acquire a handle for the
144 * desired bus. The routine table is placed in the buffer pointed
145 * to by the ret_buffer variable parameter.
147 * If the function fails an appropriate status will be returned
148 * and the value of ret_buffer is undefined.
150 * This function attempts to execute the _PRT method contained in
151 * the object indicated by the passed device_handle.
153 ******************************************************************************/
156 acpi_get_irq_routing_table(acpi_handle device_handle,
157 struct acpi_buffer *ret_buffer)
160 struct acpi_namespace_node *node;
162 ACPI_FUNCTION_TRACE(acpi_get_irq_routing_table);
164 /* Validate parameters then dispatch to internal routine */
166 status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
167 if (ACPI_FAILURE(status)) {
168 return_ACPI_STATUS(status);
171 status = acpi_rs_get_prt_method_data(node, ret_buffer);
172 return_ACPI_STATUS(status);
175 ACPI_EXPORT_SYMBOL(acpi_get_irq_routing_table)
177 /*******************************************************************************
179 * FUNCTION: acpi_get_current_resources
181 * PARAMETERS: device_handle - Handle to the device object for the
182 * device we are querying
183 * ret_buffer - Pointer to a buffer to receive the
184 * current resources for the device
188 * DESCRIPTION: This function is called to get the current resources for a
189 * specific device. The caller must first acquire a handle for
190 * the desired device. The resource data is placed in the buffer
191 * pointed to by the ret_buffer variable parameter.
193 * If the function fails an appropriate status will be returned
194 * and the value of ret_buffer is undefined.
196 * This function attempts to execute the _CRS method contained in
197 * the object indicated by the passed device_handle.
199 ******************************************************************************/
201 acpi_get_current_resources(acpi_handle device_handle,
202 struct acpi_buffer *ret_buffer)
205 struct acpi_namespace_node *node;
207 ACPI_FUNCTION_TRACE(acpi_get_current_resources);
209 /* Validate parameters then dispatch to internal routine */
211 status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
212 if (ACPI_FAILURE(status)) {
213 return_ACPI_STATUS(status);
216 status = acpi_rs_get_crs_method_data(node, ret_buffer);
217 return_ACPI_STATUS(status);
220 ACPI_EXPORT_SYMBOL(acpi_get_current_resources)
221 #ifdef ACPI_FUTURE_USAGE
222 /*******************************************************************************
224 * FUNCTION: acpi_get_possible_resources
226 * PARAMETERS: device_handle - Handle to the device object for the
227 * device we are querying
228 * ret_buffer - Pointer to a buffer to receive the
229 * resources for the device
233 * DESCRIPTION: This function is called to get a list of the possible resources
234 * for a specific device. The caller must first acquire a handle
235 * for the desired device. The resource data is placed in the
236 * buffer pointed to by the ret_buffer variable.
238 * If the function fails an appropriate status will be returned
239 * and the value of ret_buffer is undefined.
241 ******************************************************************************/
243 acpi_get_possible_resources(acpi_handle device_handle,
244 struct acpi_buffer *ret_buffer)
247 struct acpi_namespace_node *node;
249 ACPI_FUNCTION_TRACE(acpi_get_possible_resources);
251 /* Validate parameters then dispatch to internal routine */
253 status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
254 if (ACPI_FAILURE(status)) {
255 return_ACPI_STATUS(status);
258 status = acpi_rs_get_prs_method_data(node, ret_buffer);
259 return_ACPI_STATUS(status);
262 ACPI_EXPORT_SYMBOL(acpi_get_possible_resources)
263 #endif /* ACPI_FUTURE_USAGE */
264 /*******************************************************************************
266 * FUNCTION: acpi_set_current_resources
268 * PARAMETERS: device_handle - Handle to the device object for the
269 * device we are setting resources
270 * in_buffer - Pointer to a buffer containing the
271 * resources to be set for the device
275 * DESCRIPTION: This function is called to set the current resources for a
276 * specific device. The caller must first acquire a handle for
277 * the desired device. The resource data is passed to the routine
278 * the buffer pointed to by the in_buffer variable.
280 ******************************************************************************/
282 acpi_set_current_resources(acpi_handle device_handle,
283 struct acpi_buffer *in_buffer)
286 struct acpi_namespace_node *node;
288 ACPI_FUNCTION_TRACE(acpi_set_current_resources);
290 /* Validate the buffer, don't allow zero length */
292 if ((!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) {
293 return_ACPI_STATUS(AE_BAD_PARAMETER);
296 /* Validate parameters then dispatch to internal routine */
298 status = acpi_rs_validate_parameters(device_handle, in_buffer, &node);
299 if (ACPI_FAILURE(status)) {
300 return_ACPI_STATUS(status);
303 status = acpi_rs_set_srs_method_data(node, in_buffer);
304 return_ACPI_STATUS(status);
307 ACPI_EXPORT_SYMBOL(acpi_set_current_resources)
309 /******************************************************************************
311 * FUNCTION: acpi_resource_to_address64
313 * PARAMETERS: Resource - Pointer to a resource
314 * Out - Pointer to the users's return buffer
315 * (a struct acpi_resource_address64)
319 * DESCRIPTION: If the resource is an address16, address32, or address64,
320 * copy it to the address64 return buffer. This saves the
321 * caller from having to duplicate code for different-sized
324 ******************************************************************************/
326 acpi_resource_to_address64(struct acpi_resource *resource,
327 struct acpi_resource_address64 *out)
329 struct acpi_resource_address16 *address16;
330 struct acpi_resource_address32 *address32;
332 if (!resource || !out) {
333 return (AE_BAD_PARAMETER);
336 /* Convert 16 or 32 address descriptor to 64 */
338 switch (resource->type) {
339 case ACPI_RESOURCE_TYPE_ADDRESS16:
341 address16 = (struct acpi_resource_address16 *)&resource->data;
342 ACPI_COPY_ADDRESS(out, address16);
345 case ACPI_RESOURCE_TYPE_ADDRESS32:
347 address32 = (struct acpi_resource_address32 *)&resource->data;
348 ACPI_COPY_ADDRESS(out, address32);
351 case ACPI_RESOURCE_TYPE_ADDRESS64:
353 /* Simple copy for 64 bit source */
355 ACPI_MEMCPY(out, &resource->data,
356 sizeof(struct acpi_resource_address64));
360 return (AE_BAD_PARAMETER);
366 ACPI_EXPORT_SYMBOL(acpi_resource_to_address64)
368 /*******************************************************************************
370 * FUNCTION: acpi_get_vendor_resource
372 * PARAMETERS: device_handle - Handle for the parent device object
373 * Name - Method name for the parent resource
374 * (METHOD_NAME__CRS or METHOD_NAME__PRS)
375 * Uuid - Pointer to the UUID to be matched.
376 * includes both subtype and 16-byte UUID
377 * ret_buffer - Where the vendor resource is returned
381 * DESCRIPTION: Walk a resource template for the specified evice to find a
382 * vendor-defined resource that matches the supplied UUID and
383 * UUID subtype. Returns a struct acpi_resource of type Vendor.
385 ******************************************************************************/
387 acpi_get_vendor_resource(acpi_handle device_handle,
389 struct acpi_vendor_uuid * uuid,
390 struct acpi_buffer * ret_buffer)
392 struct acpi_vendor_walk_info info;
395 /* Other parameters are validated by acpi_walk_resources */
397 if (!uuid || !ret_buffer) {
398 return (AE_BAD_PARAMETER);
402 info.buffer = ret_buffer;
403 info.status = AE_NOT_EXIST;
405 /* Walk the _CRS or _PRS resource list for this device */
408 acpi_walk_resources(device_handle, name,
409 acpi_rs_match_vendor_resource, &info);
410 if (ACPI_FAILURE(status)) {
414 return (info.status);
417 ACPI_EXPORT_SYMBOL(acpi_get_vendor_resource)
419 /*******************************************************************************
421 * FUNCTION: acpi_rs_match_vendor_resource
423 * PARAMETERS: acpi_walk_resource_callback
427 * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
429 ******************************************************************************/
431 acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
433 struct acpi_vendor_walk_info *info = context;
434 struct acpi_resource_vendor_typed *vendor;
435 struct acpi_buffer *buffer;
438 /* Ignore all descriptors except Vendor */
440 if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) {
444 vendor = &resource->data.vendor_typed;
447 * For a valid match, these conditions must hold:
449 * 1) Length of descriptor data must be at least as long as a UUID struct
450 * 2) The UUID subtypes must match
451 * 3) The UUID data must match
453 if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) ||
454 (vendor->uuid_subtype != info->uuid->subtype) ||
455 (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) {
459 /* Validate/Allocate/Clear caller buffer */
461 buffer = info->buffer;
462 status = acpi_ut_initialize_buffer(buffer, resource->length);
463 if (ACPI_FAILURE(status)) {
467 /* Found the correct resource, copy and return it */
469 ACPI_MEMCPY(buffer->pointer, resource, resource->length);
470 buffer->length = resource->length;
472 /* Found the desired descriptor, terminate resource walk */
474 info->status = AE_OK;
475 return (AE_CTRL_TERMINATE);
478 /*******************************************************************************
480 * FUNCTION: acpi_walk_resources
482 * PARAMETERS: device_handle - Handle to the device object for the
483 * device we are querying
484 * Name - Method name of the resources we want
485 * (METHOD_NAME__CRS or METHOD_NAME__PRS)
486 * user_function - Called for each resource
487 * Context - Passed to user_function
491 * DESCRIPTION: Retrieves the current or possible resource list for the
492 * specified device. The user_function is called once for
493 * each resource in the list.
495 ******************************************************************************/
497 acpi_walk_resources(acpi_handle device_handle,
499 acpi_walk_resource_callback user_function, void *context)
502 struct acpi_buffer buffer;
503 struct acpi_resource *resource;
504 struct acpi_resource *resource_end;
506 ACPI_FUNCTION_TRACE(acpi_walk_resources);
508 /* Parameter validation */
510 if (!device_handle || !user_function || !name ||
511 (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
512 !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS))) {
513 return_ACPI_STATUS(AE_BAD_PARAMETER);
516 /* Get the _CRS or _PRS resource list */
518 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
519 status = acpi_rs_get_method_data(device_handle, name, &buffer);
520 if (ACPI_FAILURE(status)) {
521 return_ACPI_STATUS(status);
524 /* Buffer now contains the resource list */
526 resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
528 ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
530 /* Walk the resource list until the end_tag is found (or buffer end) */
532 while (resource < resource_end) {
534 /* Sanity check the resource */
536 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
537 status = AE_AML_INVALID_RESOURCE_TYPE;
541 /* Invoke the user function, abort on any error returned */
543 status = user_function(resource, context);
544 if (ACPI_FAILURE(status)) {
545 if (status == AE_CTRL_TERMINATE) {
547 /* This is an OK termination by the user function */
554 /* end_tag indicates end-of-list */
556 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
560 /* Get the next resource descriptor */
563 ACPI_ADD_PTR(struct acpi_resource, resource,
567 ACPI_FREE(buffer.pointer);
568 return_ACPI_STATUS(status);
571 ACPI_EXPORT_SYMBOL(acpi_walk_resources)