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1 /*******************************************************************************
2  *
3  * Module Name: rsxface - Public interfaces to the resource manager
4  *
5  ******************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43
44 #include <linux/export.h>
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acresrc.h"
48 #include "acnamesp.h"
49
50 #define _COMPONENT          ACPI_RESOURCES
51 ACPI_MODULE_NAME("rsxface")
52
53 /* Local macros for 16,32-bit to 64-bit conversion */
54 #define ACPI_COPY_FIELD(out, in, field)  ((out)->field = (in)->field)
55 #define ACPI_COPY_ADDRESS(out, in)                      \
56         ACPI_COPY_FIELD(out, in, resource_type);             \
57         ACPI_COPY_FIELD(out, in, producer_consumer);         \
58         ACPI_COPY_FIELD(out, in, decode);                    \
59         ACPI_COPY_FIELD(out, in, min_address_fixed);         \
60         ACPI_COPY_FIELD(out, in, max_address_fixed);         \
61         ACPI_COPY_FIELD(out, in, info);                      \
62         ACPI_COPY_FIELD(out, in, granularity);               \
63         ACPI_COPY_FIELD(out, in, minimum);                   \
64         ACPI_COPY_FIELD(out, in, maximum);                   \
65         ACPI_COPY_FIELD(out, in, translation_offset);        \
66         ACPI_COPY_FIELD(out, in, address_length);            \
67         ACPI_COPY_FIELD(out, in, resource_source);
68 /* Local prototypes */
69 static acpi_status
70 acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context);
71
72 static acpi_status
73 acpi_rs_validate_parameters(acpi_handle device_handle,
74                             struct acpi_buffer *buffer,
75                             struct acpi_namespace_node **return_node);
76
77 /*******************************************************************************
78  *
79  * FUNCTION:    acpi_rs_validate_parameters
80  *
81  * PARAMETERS:  device_handle   - Handle to a device
82  *              Buffer          - Pointer to a data buffer
83  *              return_node     - Pointer to where the device node is returned
84  *
85  * RETURN:      Status
86  *
87  * DESCRIPTION: Common parameter validation for resource interfaces
88  *
89  ******************************************************************************/
90
91 static acpi_status
92 acpi_rs_validate_parameters(acpi_handle device_handle,
93                             struct acpi_buffer *buffer,
94                             struct acpi_namespace_node **return_node)
95 {
96         acpi_status status;
97         struct acpi_namespace_node *node;
98
99         ACPI_FUNCTION_TRACE(rs_validate_parameters);
100
101         /*
102          * Must have a valid handle to an ACPI device
103          */
104         if (!device_handle) {
105                 return_ACPI_STATUS(AE_BAD_PARAMETER);
106         }
107
108         node = acpi_ns_validate_handle(device_handle);
109         if (!node) {
110                 return_ACPI_STATUS(AE_BAD_PARAMETER);
111         }
112
113         if (node->type != ACPI_TYPE_DEVICE) {
114                 return_ACPI_STATUS(AE_TYPE);
115         }
116
117         /*
118          * Validate the user buffer object
119          *
120          * if there is a non-zero buffer length we also need a valid pointer in
121          * the buffer. If it's a zero buffer length, we'll be returning the
122          * needed buffer size (later), so keep going.
123          */
124         status = acpi_ut_validate_buffer(buffer);
125         if (ACPI_FAILURE(status)) {
126                 return_ACPI_STATUS(status);
127         }
128
129         *return_node = node;
130         return_ACPI_STATUS(AE_OK);
131 }
132
133 /*******************************************************************************
134  *
135  * FUNCTION:    acpi_get_irq_routing_table
136  *
137  * PARAMETERS:  device_handle   - Handle to the Bus device we are querying
138  *              ret_buffer      - Pointer to a buffer to receive the
139  *                                current resources for the device
140  *
141  * RETURN:      Status
142  *
143  * DESCRIPTION: This function is called to get the IRQ routing table for a
144  *              specific bus. The caller must first acquire a handle for the
145  *              desired bus. The routine table is placed in the buffer pointed
146  *              to by the ret_buffer variable parameter.
147  *
148  *              If the function fails an appropriate status will be returned
149  *              and the value of ret_buffer is undefined.
150  *
151  *              This function attempts to execute the _PRT method contained in
152  *              the object indicated by the passed device_handle.
153  *
154  ******************************************************************************/
155
156 acpi_status
157 acpi_get_irq_routing_table(acpi_handle device_handle,
158                            struct acpi_buffer *ret_buffer)
159 {
160         acpi_status status;
161         struct acpi_namespace_node *node;
162
163         ACPI_FUNCTION_TRACE(acpi_get_irq_routing_table);
164
165         /* Validate parameters then dispatch to internal routine */
166
167         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
168         if (ACPI_FAILURE(status)) {
169                 return_ACPI_STATUS(status);
170         }
171
172         status = acpi_rs_get_prt_method_data(node, ret_buffer);
173         return_ACPI_STATUS(status);
174 }
175
176 ACPI_EXPORT_SYMBOL(acpi_get_irq_routing_table)
177
178 /*******************************************************************************
179  *
180  * FUNCTION:    acpi_get_current_resources
181  *
182  * PARAMETERS:  device_handle   - Handle to the device object for the
183  *                                device we are querying
184  *              ret_buffer      - Pointer to a buffer to receive the
185  *                                current resources for the device
186  *
187  * RETURN:      Status
188  *
189  * DESCRIPTION: This function is called to get the current resources for a
190  *              specific device. The caller must first acquire a handle for
191  *              the desired device. The resource data is placed in the buffer
192  *              pointed to by the ret_buffer variable parameter.
193  *
194  *              If the function fails an appropriate status will be returned
195  *              and the value of ret_buffer is undefined.
196  *
197  *              This function attempts to execute the _CRS method contained in
198  *              the object indicated by the passed device_handle.
199  *
200  ******************************************************************************/
201 acpi_status
202 acpi_get_current_resources(acpi_handle device_handle,
203                            struct acpi_buffer *ret_buffer)
204 {
205         acpi_status status;
206         struct acpi_namespace_node *node;
207
208         ACPI_FUNCTION_TRACE(acpi_get_current_resources);
209
210         /* Validate parameters then dispatch to internal routine */
211
212         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
213         if (ACPI_FAILURE(status)) {
214                 return_ACPI_STATUS(status);
215         }
216
217         status = acpi_rs_get_crs_method_data(node, ret_buffer);
218         return_ACPI_STATUS(status);
219 }
220
221 ACPI_EXPORT_SYMBOL(acpi_get_current_resources)
222 #ifdef ACPI_FUTURE_USAGE
223 /*******************************************************************************
224  *
225  * FUNCTION:    acpi_get_possible_resources
226  *
227  * PARAMETERS:  device_handle   - Handle to the device object for the
228  *                                device we are querying
229  *              ret_buffer      - Pointer to a buffer to receive the
230  *                                resources for the device
231  *
232  * RETURN:      Status
233  *
234  * DESCRIPTION: This function is called to get a list of the possible resources
235  *              for a specific device. The caller must first acquire a handle
236  *              for the desired device. The resource data is placed in the
237  *              buffer pointed to by the ret_buffer variable.
238  *
239  *              If the function fails an appropriate status will be returned
240  *              and the value of ret_buffer is undefined.
241  *
242  ******************************************************************************/
243 acpi_status
244 acpi_get_possible_resources(acpi_handle device_handle,
245                             struct acpi_buffer *ret_buffer)
246 {
247         acpi_status status;
248         struct acpi_namespace_node *node;
249
250         ACPI_FUNCTION_TRACE(acpi_get_possible_resources);
251
252         /* Validate parameters then dispatch to internal routine */
253
254         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
255         if (ACPI_FAILURE(status)) {
256                 return_ACPI_STATUS(status);
257         }
258
259         status = acpi_rs_get_prs_method_data(node, ret_buffer);
260         return_ACPI_STATUS(status);
261 }
262
263 ACPI_EXPORT_SYMBOL(acpi_get_possible_resources)
264 #endif                          /*  ACPI_FUTURE_USAGE  */
265 /*******************************************************************************
266  *
267  * FUNCTION:    acpi_set_current_resources
268  *
269  * PARAMETERS:  device_handle   - Handle to the device object for the
270  *                                device we are setting resources
271  *              in_buffer       - Pointer to a buffer containing the
272  *                                resources to be set for the device
273  *
274  * RETURN:      Status
275  *
276  * DESCRIPTION: This function is called to set the current resources for a
277  *              specific device. The caller must first acquire a handle for
278  *              the desired device. The resource data is passed to the routine
279  *              the buffer pointed to by the in_buffer variable.
280  *
281  ******************************************************************************/
282 acpi_status
283 acpi_set_current_resources(acpi_handle device_handle,
284                            struct acpi_buffer *in_buffer)
285 {
286         acpi_status status;
287         struct acpi_namespace_node *node;
288
289         ACPI_FUNCTION_TRACE(acpi_set_current_resources);
290
291         /* Validate the buffer, don't allow zero length */
292
293         if ((!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) {
294                 return_ACPI_STATUS(AE_BAD_PARAMETER);
295         }
296
297         /* Validate parameters then dispatch to internal routine */
298
299         status = acpi_rs_validate_parameters(device_handle, in_buffer, &node);
300         if (ACPI_FAILURE(status)) {
301                 return_ACPI_STATUS(status);
302         }
303
304         status = acpi_rs_set_srs_method_data(node, in_buffer);
305         return_ACPI_STATUS(status);
306 }
307
308 ACPI_EXPORT_SYMBOL(acpi_set_current_resources)
309
310 /*******************************************************************************
311  *
312  * FUNCTION:    acpi_get_event_resources
313  *
314  * PARAMETERS:  device_handle   - Handle to the device object for the
315  *                                device we are getting resources
316  *              in_buffer       - Pointer to a buffer containing the
317  *                                resources to be set for the device
318  *
319  * RETURN:      Status
320  *
321  * DESCRIPTION: This function is called to get the event resources for a
322  *              specific device. The caller must first acquire a handle for
323  *              the desired device. The resource data is passed to the routine
324  *              the buffer pointed to by the in_buffer variable. Uses the
325  *              _AEI method.
326  *
327  ******************************************************************************/
328 acpi_status
329 acpi_get_event_resources(acpi_handle device_handle,
330                          struct acpi_buffer *ret_buffer)
331 {
332         acpi_status status;
333         struct acpi_namespace_node *node;
334
335         ACPI_FUNCTION_TRACE(acpi_get_event_resources);
336
337         /* Validate parameters then dispatch to internal routine */
338
339         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
340         if (ACPI_FAILURE(status)) {
341                 return_ACPI_STATUS(status);
342         }
343
344         status = acpi_rs_get_aei_method_data(node, ret_buffer);
345         return_ACPI_STATUS(status);
346 }
347
348 ACPI_EXPORT_SYMBOL(acpi_get_event_resources)
349
350 /******************************************************************************
351  *
352  * FUNCTION:    acpi_resource_to_address64
353  *
354  * PARAMETERS:  Resource        - Pointer to a resource
355  *              Out             - Pointer to the users's return buffer
356  *                                (a struct acpi_resource_address64)
357  *
358  * RETURN:      Status
359  *
360  * DESCRIPTION: If the resource is an address16, address32, or address64,
361  *              copy it to the address64 return buffer. This saves the
362  *              caller from having to duplicate code for different-sized
363  *              addresses.
364  *
365  ******************************************************************************/
366 acpi_status
367 acpi_resource_to_address64(struct acpi_resource *resource,
368                            struct acpi_resource_address64 *out)
369 {
370         struct acpi_resource_address16 *address16;
371         struct acpi_resource_address32 *address32;
372
373         if (!resource || !out) {
374                 return (AE_BAD_PARAMETER);
375         }
376
377         /* Convert 16 or 32 address descriptor to 64 */
378
379         switch (resource->type) {
380         case ACPI_RESOURCE_TYPE_ADDRESS16:
381
382                 address16 =
383                     ACPI_CAST_PTR(struct acpi_resource_address16,
384                                   &resource->data);
385                 ACPI_COPY_ADDRESS(out, address16);
386                 break;
387
388         case ACPI_RESOURCE_TYPE_ADDRESS32:
389
390                 address32 =
391                     ACPI_CAST_PTR(struct acpi_resource_address32,
392                                   &resource->data);
393                 ACPI_COPY_ADDRESS(out, address32);
394                 break;
395
396         case ACPI_RESOURCE_TYPE_ADDRESS64:
397
398                 /* Simple copy for 64 bit source */
399
400                 ACPI_MEMCPY(out, &resource->data,
401                             sizeof(struct acpi_resource_address64));
402                 break;
403
404         default:
405                 return (AE_BAD_PARAMETER);
406         }
407
408         return (AE_OK);
409 }
410
411 ACPI_EXPORT_SYMBOL(acpi_resource_to_address64)
412
413 /*******************************************************************************
414  *
415  * FUNCTION:    acpi_get_vendor_resource
416  *
417  * PARAMETERS:  device_handle   - Handle for the parent device object
418  *              Name            - Method name for the parent resource
419  *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
420  *              Uuid            - Pointer to the UUID to be matched.
421  *                                includes both subtype and 16-byte UUID
422  *              ret_buffer      - Where the vendor resource is returned
423  *
424  * RETURN:      Status
425  *
426  * DESCRIPTION: Walk a resource template for the specified evice to find a
427  *              vendor-defined resource that matches the supplied UUID and
428  *              UUID subtype. Returns a struct acpi_resource of type Vendor.
429  *
430  ******************************************************************************/
431 acpi_status
432 acpi_get_vendor_resource(acpi_handle device_handle,
433                          char *name,
434                          struct acpi_vendor_uuid * uuid,
435                          struct acpi_buffer * ret_buffer)
436 {
437         struct acpi_vendor_walk_info info;
438         acpi_status status;
439
440         /* Other parameters are validated by acpi_walk_resources */
441
442         if (!uuid || !ret_buffer) {
443                 return (AE_BAD_PARAMETER);
444         }
445
446         info.uuid = uuid;
447         info.buffer = ret_buffer;
448         info.status = AE_NOT_EXIST;
449
450         /* Walk the _CRS or _PRS resource list for this device */
451
452         status =
453             acpi_walk_resources(device_handle, name,
454                                 acpi_rs_match_vendor_resource, &info);
455         if (ACPI_FAILURE(status)) {
456                 return (status);
457         }
458
459         return (info.status);
460 }
461
462 ACPI_EXPORT_SYMBOL(acpi_get_vendor_resource)
463
464 /*******************************************************************************
465  *
466  * FUNCTION:    acpi_rs_match_vendor_resource
467  *
468  * PARAMETERS:  acpi_walk_resource_callback
469  *
470  * RETURN:      Status
471  *
472  * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
473  *
474  ******************************************************************************/
475 static acpi_status
476 acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
477 {
478         struct acpi_vendor_walk_info *info = context;
479         struct acpi_resource_vendor_typed *vendor;
480         struct acpi_buffer *buffer;
481         acpi_status status;
482
483         /* Ignore all descriptors except Vendor */
484
485         if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) {
486                 return (AE_OK);
487         }
488
489         vendor = &resource->data.vendor_typed;
490
491         /*
492          * For a valid match, these conditions must hold:
493          *
494          * 1) Length of descriptor data must be at least as long as a UUID struct
495          * 2) The UUID subtypes must match
496          * 3) The UUID data must match
497          */
498         if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) ||
499             (vendor->uuid_subtype != info->uuid->subtype) ||
500             (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) {
501                 return (AE_OK);
502         }
503
504         /* Validate/Allocate/Clear caller buffer */
505
506         buffer = info->buffer;
507         status = acpi_ut_initialize_buffer(buffer, resource->length);
508         if (ACPI_FAILURE(status)) {
509                 return (status);
510         }
511
512         /* Found the correct resource, copy and return it */
513
514         ACPI_MEMCPY(buffer->pointer, resource, resource->length);
515         buffer->length = resource->length;
516
517         /* Found the desired descriptor, terminate resource walk */
518
519         info->status = AE_OK;
520         return (AE_CTRL_TERMINATE);
521 }
522
523 /*******************************************************************************
524  *
525  * FUNCTION:    acpi_walk_resources
526  *
527  * PARAMETERS:  device_handle   - Handle to the device object for the
528  *                                device we are querying
529  *              Name            - Method name of the resources we want.
530  *                                (METHOD_NAME__CRS, METHOD_NAME__PRS, or
531  *                                METHOD_NAME__AEI)
532  *              user_function   - Called for each resource
533  *              Context         - Passed to user_function
534  *
535  * RETURN:      Status
536  *
537  * DESCRIPTION: Retrieves the current or possible resource list for the
538  *              specified device. The user_function is called once for
539  *              each resource in the list.
540  *
541  ******************************************************************************/
542 acpi_status
543 acpi_walk_resources(acpi_handle device_handle,
544                     char *name,
545                     acpi_walk_resource_callback user_function, void *context)
546 {
547         acpi_status status;
548         struct acpi_buffer buffer;
549         struct acpi_resource *resource;
550         struct acpi_resource *resource_end;
551
552         ACPI_FUNCTION_TRACE(acpi_walk_resources);
553
554         /* Parameter validation */
555
556         if (!device_handle || !user_function || !name ||
557             (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
558              !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS) &&
559              !ACPI_COMPARE_NAME(name, METHOD_NAME__AEI))) {
560                 return_ACPI_STATUS(AE_BAD_PARAMETER);
561         }
562
563         /* Get the _CRS/_PRS/_AEI resource list */
564
565         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
566         status = acpi_rs_get_method_data(device_handle, name, &buffer);
567         if (ACPI_FAILURE(status)) {
568                 return_ACPI_STATUS(status);
569         }
570
571         /* Buffer now contains the resource list */
572
573         resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
574         resource_end =
575             ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
576
577         /* Walk the resource list until the end_tag is found (or buffer end) */
578
579         while (resource < resource_end) {
580
581                 /* Sanity check the resource */
582
583                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
584                         status = AE_AML_INVALID_RESOURCE_TYPE;
585                         break;
586                 }
587
588                 /* Invoke the user function, abort on any error returned */
589
590                 status = user_function(resource, context);
591                 if (ACPI_FAILURE(status)) {
592                         if (status == AE_CTRL_TERMINATE) {
593
594                                 /* This is an OK termination by the user function */
595
596                                 status = AE_OK;
597                         }
598                         break;
599                 }
600
601                 /* end_tag indicates end-of-list */
602
603                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
604                         break;
605                 }
606
607                 /* Get the next resource descriptor */
608
609                 resource =
610                     ACPI_ADD_PTR(struct acpi_resource, resource,
611                                  resource->length);
612         }
613
614         ACPI_FREE(buffer.pointer);
615         return_ACPI_STATUS(status);
616 }
617
618 ACPI_EXPORT_SYMBOL(acpi_walk_resources)