1/*
2 * drivers/acpi/resource.c - ACPI device resources interpretation.
3 *
4 * Copyright (C) 2012, Intel Corp.
5 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 */
20
21#include <linux/acpi.h>
22#include <linux/device.h>
23#include <linux/export.h>
24#include <linux/ioport.h>
25#include <linux/slab.h>
26#include <linux/irq.h>
27
28#ifdef CONFIG_X86
29#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
30static inline bool acpi_iospace_resource_valid(struct resource *res)
31{
32 /* On X86 IO space is limited to the [0 - 64K] IO port range */
33 return res->end < 0x10003;
34}
35#else
36#define valid_IRQ(i) (true)
37/*
38 * ACPI IO descriptors on arches other than X86 contain MMIO CPU physical
39 * addresses mapping IO space in CPU physical address space, IO space
40 * resources can be placed anywhere in the 64-bit physical address space.
41 */
42static inline bool
43acpi_iospace_resource_valid(struct resource *res) { return true; }
44#endif
45
46#if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)
47static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
48{
49 return ext_irq->resource_source.string_length == 0 &&
50 ext_irq->producer_consumer == ACPI_CONSUMER;
51}
52#else
53static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
54{
55 return true;
56}
57#endif
58
59static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
60{
61 u64 reslen = end - start + 1;
62
63 /*
64 * CHECKME: len might be required to check versus a minimum
65 * length as well. 1 for io is fine, but for memory it does
66 * not make any sense at all.
67 * Note: some BIOSes report incorrect length for ACPI address space
68 * descriptor, so remove check of 'reslen == len' to avoid regression.
69 */
70 if (len && reslen && start <= end)
71 return true;
72
73 pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
74 io ? "io" : "mem", start, end, len);
75
76 return false;
77}
78
79static void acpi_dev_memresource_flags(struct resource *res, u64 len,
80 u8 write_protect)
81{
82 res->flags = IORESOURCE_MEM;
83
84 if (!acpi_dev_resource_len_valid(res->start, res->end, len, false))
85 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
86
87 if (write_protect == ACPI_READ_WRITE_MEMORY)
88 res->flags |= IORESOURCE_MEM_WRITEABLE;
89}
90
91static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
92 u8 write_protect)
93{
94 res->start = start;
95 res->end = start + len - 1;
96 acpi_dev_memresource_flags(res, len, write_protect);
97}
98
99/**
100 * acpi_dev_resource_memory - Extract ACPI memory resource information.
101 * @ares: Input ACPI resource object.
102 * @res: Output generic resource object.
103 *
104 * Check if the given ACPI resource object represents a memory resource and
105 * if that's the case, use the information in it to populate the generic
106 * resource object pointed to by @res.
107 *
108 * Return:
109 * 1) false with res->flags setting to zero: not the expected resource type
110 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
111 * 3) true: valid assigned resource
112 */
113bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
114{
115 struct acpi_resource_memory24 *memory24;
116 struct acpi_resource_memory32 *memory32;
117 struct acpi_resource_fixed_memory32 *fixed_memory32;
118
119 switch (ares->type) {
120 case ACPI_RESOURCE_TYPE_MEMORY24:
121 memory24 = &ares->data.memory24;
122 acpi_dev_get_memresource(res, memory24->minimum << 8,
123 memory24->address_length << 8,
124 memory24->write_protect);
125 break;
126 case ACPI_RESOURCE_TYPE_MEMORY32:
127 memory32 = &ares->data.memory32;
128 acpi_dev_get_memresource(res, memory32->minimum,
129 memory32->address_length,
130 memory32->write_protect);
131 break;
132 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
133 fixed_memory32 = &ares->data.fixed_memory32;
134 acpi_dev_get_memresource(res, fixed_memory32->address,
135 fixed_memory32->address_length,
136 fixed_memory32->write_protect);
137 break;
138 default:
139 res->flags = 0;
140 return false;
141 }
142
143 return !(res->flags & IORESOURCE_DISABLED);
144}
145EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
146
147static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
148 u8 io_decode, u8 translation_type)
149{
150 res->flags = IORESOURCE_IO;
151
152 if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
153 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
154
155 if (!acpi_iospace_resource_valid(res))
156 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
157
158 if (io_decode == ACPI_DECODE_16)
159 res->flags |= IORESOURCE_IO_16BIT_ADDR;
160 if (translation_type == ACPI_SPARSE_TRANSLATION)
161 res->flags |= IORESOURCE_IO_SPARSE;
162}
163
164static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
165 u8 io_decode)
166{
167 res->start = start;
168 res->end = start + len - 1;
169 acpi_dev_ioresource_flags(res, len, io_decode, 0);
170}
171
172/**
173 * acpi_dev_resource_io - Extract ACPI I/O resource information.
174 * @ares: Input ACPI resource object.
175 * @res: Output generic resource object.
176 *
177 * Check if the given ACPI resource object represents an I/O resource and
178 * if that's the case, use the information in it to populate the generic
179 * resource object pointed to by @res.
180 *
181 * Return:
182 * 1) false with res->flags setting to zero: not the expected resource type
183 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
184 * 3) true: valid assigned resource
185 */
186bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
187{
188 struct acpi_resource_io *io;
189 struct acpi_resource_fixed_io *fixed_io;
190
191 switch (ares->type) {
192 case ACPI_RESOURCE_TYPE_IO:
193 io = &ares->data.io;
194 acpi_dev_get_ioresource(res, io->minimum,
195 io->address_length,
196 io->io_decode);
197 break;
198 case ACPI_RESOURCE_TYPE_FIXED_IO:
199 fixed_io = &ares->data.fixed_io;
200 acpi_dev_get_ioresource(res, fixed_io->address,
201 fixed_io->address_length,
202 ACPI_DECODE_10);
203 break;
204 default:
205 res->flags = 0;
206 return false;
207 }
208
209 return !(res->flags & IORESOURCE_DISABLED);
210}
211EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
212
213static bool acpi_decode_space(struct resource_win *win,
214 struct acpi_resource_address *addr,
215 struct acpi_address64_attribute *attr)
216{
217 u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
218 bool wp = addr->info.mem.write_protect;
219 u64 len = attr->address_length;
220 u64 start, end, offset = 0;
221 struct resource *res = &win->res;
222
223 /*
224 * Filter out invalid descriptor according to ACPI Spec 5.0, section
225 * 6.4.3.5 Address Space Resource Descriptors.
226 */
227 if ((addr->min_address_fixed != addr->max_address_fixed && len) ||
228 (addr->min_address_fixed && addr->max_address_fixed && !len))
229 pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
230 addr->min_address_fixed, addr->max_address_fixed, len);
231
232 /*
233 * For bridges that translate addresses across the bridge,
234 * translation_offset is the offset that must be added to the
235 * address on the secondary side to obtain the address on the
236 * primary side. Non-bridge devices must list 0 for all Address
237 * Translation offset bits.
238 */
239 if (addr->producer_consumer == ACPI_PRODUCER)
240 offset = attr->translation_offset;
241 else if (attr->translation_offset)
242 pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
243 attr->translation_offset);
244 start = attr->minimum + offset;
245 end = attr->maximum + offset;
246
247 win->offset = offset;
248 res->start = start;
249 res->end = end;
250 if (sizeof(resource_size_t) < sizeof(u64) &&
251 (offset != win->offset || start != res->start || end != res->end)) {
252 pr_warn("acpi resource window ([%#llx-%#llx] ignored, not CPU addressable)\n",
253 attr->minimum, attr->maximum);
254 return false;
255 }
256
257 switch (addr->resource_type) {
258 case ACPI_MEMORY_RANGE:
259 acpi_dev_memresource_flags(res, len, wp);
260 break;
261 case ACPI_IO_RANGE:
262 acpi_dev_ioresource_flags(res, len, iodec,
263 addr->info.io.translation_type);
264 break;
265 case ACPI_BUS_NUMBER_RANGE:
266 res->flags = IORESOURCE_BUS;
267 break;
268 default:
269 return false;
270 }
271
272 if (addr->producer_consumer == ACPI_PRODUCER)
273 res->flags |= IORESOURCE_WINDOW;
274
275 if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
276 res->flags |= IORESOURCE_PREFETCH;
277
278 return !(res->flags & IORESOURCE_DISABLED);
279}
280
281/**
282 * acpi_dev_resource_address_space - Extract ACPI address space information.
283 * @ares: Input ACPI resource object.
284 * @win: Output generic resource object.
285 *
286 * Check if the given ACPI resource object represents an address space resource
287 * and if that's the case, use the information in it to populate the generic
288 * resource object pointed to by @win.
289 *
290 * Return:
291 * 1) false with win->res.flags setting to zero: not the expected resource type
292 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
293 * resource
294 * 3) true: valid assigned resource
295 */
296bool acpi_dev_resource_address_space(struct acpi_resource *ares,
297 struct resource_win *win)
298{
299 struct acpi_resource_address64 addr;
300
301 win->res.flags = 0;
302 if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
303 return false;
304
305 return acpi_decode_space(win, (struct acpi_resource_address *)&addr,
306 &addr.address);
307}
308EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
309
310/**
311 * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
312 * @ares: Input ACPI resource object.
313 * @win: Output generic resource object.
314 *
315 * Check if the given ACPI resource object represents an extended address space
316 * resource and if that's the case, use the information in it to populate the
317 * generic resource object pointed to by @win.
318 *
319 * Return:
320 * 1) false with win->res.flags setting to zero: not the expected resource type
321 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
322 * resource
323 * 3) true: valid assigned resource
324 */
325bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
326 struct resource_win *win)
327{
328 struct acpi_resource_extended_address64 *ext_addr;
329
330 win->res.flags = 0;
331 if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
332 return false;
333
334 ext_addr = &ares->data.ext_address64;
335
336 return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,
337 &ext_addr->address);
338}
339EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
340
341/**
342 * acpi_dev_irq_flags - Determine IRQ resource flags.
343 * @triggering: Triggering type as provided by ACPI.
344 * @polarity: Interrupt polarity as provided by ACPI.
345 * @shareable: Whether or not the interrupt is shareable.
346 */
347unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
348{
349 unsigned long flags;
350
351 if (triggering == ACPI_LEVEL_SENSITIVE)
352 flags = polarity == ACPI_ACTIVE_LOW ?
353 IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
354 else
355 flags = polarity == ACPI_ACTIVE_LOW ?
356 IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
357
358 if (shareable == ACPI_SHARED)
359 flags |= IORESOURCE_IRQ_SHAREABLE;
360
361 return flags | IORESOURCE_IRQ;
362}
363EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
364
365/**
366 * acpi_dev_get_irq_type - Determine irq type.
367 * @triggering: Triggering type as provided by ACPI.
368 * @polarity: Interrupt polarity as provided by ACPI.
369 */
370unsigned int acpi_dev_get_irq_type(int triggering, int polarity)
371{
372 switch (polarity) {
373 case ACPI_ACTIVE_LOW:
374 return triggering == ACPI_EDGE_SENSITIVE ?
375 IRQ_TYPE_EDGE_FALLING :
376 IRQ_TYPE_LEVEL_LOW;
377 case ACPI_ACTIVE_HIGH:
378 return triggering == ACPI_EDGE_SENSITIVE ?
379 IRQ_TYPE_EDGE_RISING :
380 IRQ_TYPE_LEVEL_HIGH;
381 case ACPI_ACTIVE_BOTH:
382 if (triggering == ACPI_EDGE_SENSITIVE)
383 return IRQ_TYPE_EDGE_BOTH;
384 /* fall through */
385 default:
386 return IRQ_TYPE_NONE;
387 }
388}
389EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
390
391static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
392{
393 res->start = gsi;
394 res->end = gsi;
395 res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
396}
397
398static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
399 u8 triggering, u8 polarity, u8 shareable,
400 bool legacy)
401{
402 int irq, p, t;
403
404 if (!valid_IRQ(gsi)) {
405 acpi_dev_irqresource_disabled(res, gsi);
406 return;
407 }
408
409 /*
410 * In IO-APIC mode, use overridden attribute. Two reasons:
411 * 1. BIOS bug in DSDT
412 * 2. BIOS uses IO-APIC mode Interrupt Source Override
413 *
414 * We do this only if we are dealing with IRQ() or IRQNoFlags()
415 * resource (the legacy ISA resources). With modern ACPI 5 devices
416 * using extended IRQ descriptors we take the IRQ configuration
417 * from _CRS directly.
418 */
419 if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
420 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
421 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
422
423 if (triggering != trig || polarity != pol) {
424 pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
425 t ? "level" : "edge", p ? "low" : "high");
426 triggering = trig;
427 polarity = pol;
428 }
429 }
430
431 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
432 irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
433 if (irq >= 0) {
434 res->start = irq;
435 res->end = irq;
436 } else {
437 acpi_dev_irqresource_disabled(res, gsi);
438 }
439}
440
441/**
442 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
443 * @ares: Input ACPI resource object.
444 * @index: Index into the array of GSIs represented by the resource.
445 * @res: Output generic resource object.
446 *
447 * Check if the given ACPI resource object represents an interrupt resource
448 * and @index does not exceed the resource's interrupt count (true is returned
449 * in that case regardless of the results of the other checks)). If that's the
450 * case, register the GSI corresponding to @index from the array of interrupts
451 * represented by the resource and populate the generic resource object pointed
452 * to by @res accordingly. If the registration of the GSI is not successful,
453 * IORESOURCE_DISABLED will be set it that object's flags.
454 *
455 * Return:
456 * 1) false with res->flags setting to zero: not the expected resource type
457 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
458 * 3) true: valid assigned resource
459 */
460bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
461 struct resource *res)
462{
463 struct acpi_resource_irq *irq;
464 struct acpi_resource_extended_irq *ext_irq;
465
466 switch (ares->type) {
467 case ACPI_RESOURCE_TYPE_IRQ:
468 /*
469 * Per spec, only one interrupt per descriptor is allowed in
470 * _CRS, but some firmware violates this, so parse them all.
471 */
472 irq = &ares->data.irq;
473 if (index >= irq->interrupt_count) {
474 acpi_dev_irqresource_disabled(res, 0);
475 return false;
476 }
477 acpi_dev_get_irqresource(res, irq->interrupts[index],
478 irq->triggering, irq->polarity,
479 irq->shareable, true);
480 break;
481 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
482 ext_irq = &ares->data.extended_irq;
483 if (index >= ext_irq->interrupt_count) {
484 acpi_dev_irqresource_disabled(res, 0);
485 return false;
486 }
487 if (is_gsi(ext_irq))
488 acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
489 ext_irq->triggering, ext_irq->polarity,
490 ext_irq->shareable, false);
491 else
492 acpi_dev_irqresource_disabled(res, 0);
493 break;
494 default:
495 res->flags = 0;
496 return false;
497 }
498
499 return true;
500}
501EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
502
503/**
504 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
505 * @list: The head of the resource list to free.
506 */
507void acpi_dev_free_resource_list(struct list_head *list)
508{
509 resource_list_free(list);
510}
511EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
512
513struct res_proc_context {
514 struct list_head *list;
515 int (*preproc)(struct acpi_resource *, void *);
516 void *preproc_data;
517 int count;
518 int error;
519};
520
521static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
522 struct res_proc_context *c)
523{
524 struct resource_entry *rentry;
525
526 rentry = resource_list_create_entry(NULL, 0);
527 if (!rentry) {
528 c->error = -ENOMEM;
529 return AE_NO_MEMORY;
530 }
531 *rentry->res = win->res;
532 rentry->offset = win->offset;
533 resource_list_add_tail(rentry, c->list);
534 c->count++;
535 return AE_OK;
536}
537
538static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
539 void *context)
540{
541 struct res_proc_context *c = context;
542 struct resource_win win;
543 struct resource *res = &win.res;
544 int i;
545
546 if (c->preproc) {
547 int ret;
548
549 ret = c->preproc(ares, c->preproc_data);
550 if (ret < 0) {
551 c->error = ret;
552 return AE_CTRL_TERMINATE;
553 } else if (ret > 0) {
554 return AE_OK;
555 }
556 }
557
558 memset(&win, 0, sizeof(win));
559
560 if (acpi_dev_resource_memory(ares, res)
561 || acpi_dev_resource_io(ares, res)
562 || acpi_dev_resource_address_space(ares, &win)
563 || acpi_dev_resource_ext_address_space(ares, &win))
564 return acpi_dev_new_resource_entry(&win, c);
565
566 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
567 acpi_status status;
568
569 status = acpi_dev_new_resource_entry(&win, c);
570 if (ACPI_FAILURE(status))
571 return status;
572 }
573
574 return AE_OK;
575}
576
577static int __acpi_dev_get_resources(struct acpi_device *adev,
578 struct list_head *list,
579 int (*preproc)(struct acpi_resource *, void *),
580 void *preproc_data, char *method)
581{
582 struct res_proc_context c;
583 acpi_status status;
584
585 if (!adev || !adev->handle || !list_empty(list))
586 return -EINVAL;
587
588 if (!acpi_has_method(adev->handle, method))
589 return 0;
590
591 c.list = list;
592 c.preproc = preproc;
593 c.preproc_data = preproc_data;
594 c.count = 0;
595 c.error = 0;
596 status = acpi_walk_resources(adev->handle, method,
597 acpi_dev_process_resource, &c);
598 if (ACPI_FAILURE(status)) {
599 acpi_dev_free_resource_list(list);
600 return c.error ? c.error : -EIO;
601 }
602
603 return c.count;
604}
605
606/**
607 * acpi_dev_get_resources - Get current resources of a device.
608 * @adev: ACPI device node to get the resources for.
609 * @list: Head of the resultant list of resources (must be empty).
610 * @preproc: The caller's preprocessing routine.
611 * @preproc_data: Pointer passed to the caller's preprocessing routine.
612 *
613 * Evaluate the _CRS method for the given device node and process its output by
614 * (1) executing the @preproc() rountine provided by the caller, passing the
615 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
616 * returned and (2) converting all of the returned ACPI resources into struct
617 * resource objects if possible. If the return value of @preproc() in step (1)
618 * is different from 0, step (2) is not applied to the given ACPI resource and
619 * if that value is negative, the whole processing is aborted and that value is
620 * returned as the final error code.
621 *
622 * The resultant struct resource objects are put on the list pointed to by
623 * @list, that must be empty initially, as members of struct resource_entry
624 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
625 * free that list.
626 *
627 * The number of resources in the output list is returned on success, an error
628 * code reflecting the error condition is returned otherwise.
629 */
630int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
631 int (*preproc)(struct acpi_resource *, void *),
632 void *preproc_data)
633{
634 return __acpi_dev_get_resources(adev, list, preproc, preproc_data,
635 METHOD_NAME__CRS);
636}
637EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
638
639static int is_memory(struct acpi_resource *ares, void *not_used)
640{
641 struct resource_win win;
642 struct resource *res = &win.res;
643
644 memset(&win, 0, sizeof(win));
645
646 return !(acpi_dev_resource_memory(ares, res)
647 || acpi_dev_resource_address_space(ares, &win)
648 || acpi_dev_resource_ext_address_space(ares, &win));
649}
650
651/**
652 * acpi_dev_get_dma_resources - Get current DMA resources of a device.
653 * @adev: ACPI device node to get the resources for.
654 * @list: Head of the resultant list of resources (must be empty).
655 *
656 * Evaluate the _DMA method for the given device node and process its
657 * output.
658 *
659 * The resultant struct resource objects are put on the list pointed to
660 * by @list, that must be empty initially, as members of struct
661 * resource_entry objects. Callers of this routine should use
662 * %acpi_dev_free_resource_list() to free that list.
663 *
664 * The number of resources in the output list is returned on success,
665 * an error code reflecting the error condition is returned otherwise.
666 */
667int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
668{
669 return __acpi_dev_get_resources(adev, list, is_memory, NULL,
670 METHOD_NAME__DMA);
671}
672EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
673
674/**
675 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
676 * types
677 * @ares: Input ACPI resource object.
678 * @types: Valid resource types of IORESOURCE_XXX
679 *
680 * This is a helper function to support acpi_dev_get_resources(), which filters
681 * ACPI resource objects according to resource types.
682 */
683int acpi_dev_filter_resource_type(struct acpi_resource *ares,
684 unsigned long types)
685{
686 unsigned long type = 0;
687
688 switch (ares->type) {
689 case ACPI_RESOURCE_TYPE_MEMORY24:
690 case ACPI_RESOURCE_TYPE_MEMORY32:
691 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
692 type = IORESOURCE_MEM;
693 break;
694 case ACPI_RESOURCE_TYPE_IO:
695 case ACPI_RESOURCE_TYPE_FIXED_IO:
696 type = IORESOURCE_IO;
697 break;
698 case ACPI_RESOURCE_TYPE_IRQ:
699 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
700 type = IORESOURCE_IRQ;
701 break;
702 case ACPI_RESOURCE_TYPE_DMA:
703 case ACPI_RESOURCE_TYPE_FIXED_DMA:
704 type = IORESOURCE_DMA;
705 break;
706 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
707 type = IORESOURCE_REG;
708 break;
709 case ACPI_RESOURCE_TYPE_ADDRESS16:
710 case ACPI_RESOURCE_TYPE_ADDRESS32:
711 case ACPI_RESOURCE_TYPE_ADDRESS64:
712 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
713 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
714 type = IORESOURCE_MEM;
715 else if (ares->data.address.resource_type == ACPI_IO_RANGE)
716 type = IORESOURCE_IO;
717 else if (ares->data.address.resource_type ==
718 ACPI_BUS_NUMBER_RANGE)
719 type = IORESOURCE_BUS;
720 break;
721 default:
722 break;
723 }
724
725 return (type & types) ? 0 : 1;
726}
727EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
728
729static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res)
730{
731 struct list_head resource_list;
732 struct resource_entry *rentry;
733 int ret, found = 0;
734
735 INIT_LIST_HEAD(&resource_list);
736 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
737 if (ret < 0)
738 return 0;
739
740 list_for_each_entry(rentry, &resource_list, node) {
741 if (resource_contains(rentry->res, res)) {
742 found = 1;
743 break;
744 }
745
746 }
747
748 acpi_dev_free_resource_list(&resource_list);
749 return found;
750}
751
752static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
753 void *context, void **ret)
754{
755 struct resource *res = context;
756 struct acpi_device **consumer = (struct acpi_device **) ret;
757 struct acpi_device *adev;
758
759 if (acpi_bus_get_device(handle, &adev))
760 return AE_OK;
761
762 if (acpi_dev_consumes_res(adev, res)) {
763 *consumer = adev;
764 return AE_CTRL_TERMINATE;
765 }
766
767 return AE_OK;
768}
769
770/**
771 * acpi_resource_consumer - Find the ACPI device that consumes @res.
772 * @res: Resource to search for.
773 *
774 * Search the current resource settings (_CRS) of every ACPI device node
775 * for @res. If we find an ACPI device whose _CRS includes @res, return
776 * it. Otherwise, return NULL.
777 */
778struct acpi_device *acpi_resource_consumer(struct resource *res)
779{
780 struct acpi_device *consumer = NULL;
781
782 acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer);
783 return consumer;
784}
785