1 // SPDX-License-Identifier: GPL-2.0-only
3 * drivers/acpi/resource.c - ACPI device resources interpretation.
5 * Copyright (C) 2012, Intel Corp.
6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 #include <linux/acpi.h>
14 #include <linux/device.h>
15 #include <linux/export.h>
16 #include <linux/ioport.h>
17 #include <linux/slab.h>
18 #include <linux/irq.h>
19 #include <linux/dmi.h>
22 #define valid_IRQ(i) (((i) != 0) && ((i) != 2))
23 static inline bool acpi_iospace_resource_valid(struct resource *res)
25 /* On X86 IO space is limited to the [0 - 64K] IO port range */
26 return res->end < 0x10003;
29 #define valid_IRQ(i) (true)
31 * ACPI IO descriptors on arches other than X86 contain MMIO CPU physical
32 * addresses mapping IO space in CPU physical address space, IO space
33 * resources can be placed anywhere in the 64-bit physical address space.
36 acpi_iospace_resource_valid(struct resource *res) { return true; }
39 #if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)
40 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
42 return ext_irq->resource_source.string_length == 0 &&
43 ext_irq->producer_consumer == ACPI_CONSUMER;
46 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
52 static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
54 u64 reslen = end - start + 1;
57 * CHECKME: len might be required to check versus a minimum
58 * length as well. 1 for io is fine, but for memory it does
59 * not make any sense at all.
60 * Note: some BIOSes report incorrect length for ACPI address space
61 * descriptor, so remove check of 'reslen == len' to avoid regression.
63 if (len && reslen && start <= end)
66 pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
67 io ? "io" : "mem", start, end, len);
72 static void acpi_dev_memresource_flags(struct resource *res, u64 len,
75 res->flags = IORESOURCE_MEM;
77 if (!acpi_dev_resource_len_valid(res->start, res->end, len, false))
78 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
80 if (write_protect == ACPI_READ_WRITE_MEMORY)
81 res->flags |= IORESOURCE_MEM_WRITEABLE;
84 static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
88 res->end = start + len - 1;
89 acpi_dev_memresource_flags(res, len, write_protect);
93 * acpi_dev_resource_memory - Extract ACPI memory resource information.
94 * @ares: Input ACPI resource object.
95 * @res: Output generic resource object.
97 * Check if the given ACPI resource object represents a memory resource and
98 * if that's the case, use the information in it to populate the generic
99 * resource object pointed to by @res.
102 * 1) false with res->flags setting to zero: not the expected resource type
103 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
104 * 3) true: valid assigned resource
106 bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
108 struct acpi_resource_memory24 *memory24;
109 struct acpi_resource_memory32 *memory32;
110 struct acpi_resource_fixed_memory32 *fixed_memory32;
112 switch (ares->type) {
113 case ACPI_RESOURCE_TYPE_MEMORY24:
114 memory24 = &ares->data.memory24;
115 acpi_dev_get_memresource(res, memory24->minimum << 8,
116 memory24->address_length << 8,
117 memory24->write_protect);
119 case ACPI_RESOURCE_TYPE_MEMORY32:
120 memory32 = &ares->data.memory32;
121 acpi_dev_get_memresource(res, memory32->minimum,
122 memory32->address_length,
123 memory32->write_protect);
125 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
126 fixed_memory32 = &ares->data.fixed_memory32;
127 acpi_dev_get_memresource(res, fixed_memory32->address,
128 fixed_memory32->address_length,
129 fixed_memory32->write_protect);
136 return !(res->flags & IORESOURCE_DISABLED);
138 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
140 static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
141 u8 io_decode, u8 translation_type)
143 res->flags = IORESOURCE_IO;
145 if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
146 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
148 if (!acpi_iospace_resource_valid(res))
149 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
151 if (io_decode == ACPI_DECODE_16)
152 res->flags |= IORESOURCE_IO_16BIT_ADDR;
153 if (translation_type == ACPI_SPARSE_TRANSLATION)
154 res->flags |= IORESOURCE_IO_SPARSE;
157 static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
161 res->end = start + len - 1;
162 acpi_dev_ioresource_flags(res, len, io_decode, 0);
166 * acpi_dev_resource_io - Extract ACPI I/O resource information.
167 * @ares: Input ACPI resource object.
168 * @res: Output generic resource object.
170 * Check if the given ACPI resource object represents an I/O resource and
171 * if that's the case, use the information in it to populate the generic
172 * resource object pointed to by @res.
175 * 1) false with res->flags setting to zero: not the expected resource type
176 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
177 * 3) true: valid assigned resource
179 bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
181 struct acpi_resource_io *io;
182 struct acpi_resource_fixed_io *fixed_io;
184 switch (ares->type) {
185 case ACPI_RESOURCE_TYPE_IO:
187 acpi_dev_get_ioresource(res, io->minimum,
191 case ACPI_RESOURCE_TYPE_FIXED_IO:
192 fixed_io = &ares->data.fixed_io;
193 acpi_dev_get_ioresource(res, fixed_io->address,
194 fixed_io->address_length,
202 return !(res->flags & IORESOURCE_DISABLED);
204 EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
206 static bool acpi_decode_space(struct resource_win *win,
207 struct acpi_resource_address *addr,
208 struct acpi_address64_attribute *attr)
210 u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
211 bool wp = addr->info.mem.write_protect;
212 u64 len = attr->address_length;
213 u64 start, end, offset = 0;
214 struct resource *res = &win->res;
217 * Filter out invalid descriptor according to ACPI Spec 5.0, section
218 * 6.4.3.5 Address Space Resource Descriptors.
220 if ((addr->min_address_fixed != addr->max_address_fixed && len) ||
221 (addr->min_address_fixed && addr->max_address_fixed && !len))
222 pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
223 addr->min_address_fixed, addr->max_address_fixed, len);
226 * For bridges that translate addresses across the bridge,
227 * translation_offset is the offset that must be added to the
228 * address on the secondary side to obtain the address on the
229 * primary side. Non-bridge devices must list 0 for all Address
230 * Translation offset bits.
232 if (addr->producer_consumer == ACPI_PRODUCER)
233 offset = attr->translation_offset;
234 else if (attr->translation_offset)
235 pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
236 attr->translation_offset);
237 start = attr->minimum + offset;
238 end = attr->maximum + offset;
240 win->offset = offset;
243 if (sizeof(resource_size_t) < sizeof(u64) &&
244 (offset != win->offset || start != res->start || end != res->end)) {
245 pr_warn("acpi resource window ([%#llx-%#llx] ignored, not CPU addressable)\n",
246 attr->minimum, attr->maximum);
250 switch (addr->resource_type) {
251 case ACPI_MEMORY_RANGE:
252 acpi_dev_memresource_flags(res, len, wp);
255 acpi_dev_ioresource_flags(res, len, iodec,
256 addr->info.io.translation_type);
258 case ACPI_BUS_NUMBER_RANGE:
259 res->flags = IORESOURCE_BUS;
265 if (addr->producer_consumer == ACPI_PRODUCER)
266 res->flags |= IORESOURCE_WINDOW;
268 if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
269 res->flags |= IORESOURCE_PREFETCH;
271 return !(res->flags & IORESOURCE_DISABLED);
275 * acpi_dev_resource_address_space - Extract ACPI address space information.
276 * @ares: Input ACPI resource object.
277 * @win: Output generic resource object.
279 * Check if the given ACPI resource object represents an address space resource
280 * and if that's the case, use the information in it to populate the generic
281 * resource object pointed to by @win.
284 * 1) false with win->res.flags setting to zero: not the expected resource type
285 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
287 * 3) true: valid assigned resource
289 bool acpi_dev_resource_address_space(struct acpi_resource *ares,
290 struct resource_win *win)
292 struct acpi_resource_address64 addr;
295 if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
298 return acpi_decode_space(win, (struct acpi_resource_address *)&addr,
301 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
304 * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
305 * @ares: Input ACPI resource object.
306 * @win: Output generic resource object.
308 * Check if the given ACPI resource object represents an extended address space
309 * resource and if that's the case, use the information in it to populate the
310 * generic resource object pointed to by @win.
313 * 1) false with win->res.flags setting to zero: not the expected resource type
314 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
316 * 3) true: valid assigned resource
318 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
319 struct resource_win *win)
321 struct acpi_resource_extended_address64 *ext_addr;
324 if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
327 ext_addr = &ares->data.ext_address64;
329 return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,
332 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
335 * acpi_dev_irq_flags - Determine IRQ resource flags.
336 * @triggering: Triggering type as provided by ACPI.
337 * @polarity: Interrupt polarity as provided by ACPI.
338 * @shareable: Whether or not the interrupt is shareable.
340 unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
344 if (triggering == ACPI_LEVEL_SENSITIVE)
345 flags = polarity == ACPI_ACTIVE_LOW ?
346 IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
348 flags = polarity == ACPI_ACTIVE_LOW ?
349 IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
351 if (shareable == ACPI_SHARED)
352 flags |= IORESOURCE_IRQ_SHAREABLE;
354 return flags | IORESOURCE_IRQ;
356 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
359 * acpi_dev_get_irq_type - Determine irq type.
360 * @triggering: Triggering type as provided by ACPI.
361 * @polarity: Interrupt polarity as provided by ACPI.
363 unsigned int acpi_dev_get_irq_type(int triggering, int polarity)
366 case ACPI_ACTIVE_LOW:
367 return triggering == ACPI_EDGE_SENSITIVE ?
368 IRQ_TYPE_EDGE_FALLING :
370 case ACPI_ACTIVE_HIGH:
371 return triggering == ACPI_EDGE_SENSITIVE ?
372 IRQ_TYPE_EDGE_RISING :
374 case ACPI_ACTIVE_BOTH:
375 if (triggering == ACPI_EDGE_SENSITIVE)
376 return IRQ_TYPE_EDGE_BOTH;
379 return IRQ_TYPE_NONE;
382 EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
384 static const struct dmi_system_id medion_laptop[] = {
386 .ident = "MEDION P15651",
388 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
389 DMI_MATCH(DMI_BOARD_NAME, "M15T"),
393 .ident = "MEDION S17405",
395 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
396 DMI_MATCH(DMI_BOARD_NAME, "M17T"),
402 struct irq_override_cmp {
403 const struct dmi_system_id *system;
405 unsigned char triggering;
406 unsigned char polarity;
407 unsigned char shareable;
410 static const struct irq_override_cmp skip_override_table[] = {
411 { medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0 },
414 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
421 * IRQ override isn't needed on modern AMD Zen systems and
422 * this override breaks active low IRQs on AMD Ryzen 6000 and
423 * newer systems. Skip it.
425 if (boot_cpu_has(X86_FEATURE_ZEN))
429 for (i = 0; i < ARRAY_SIZE(skip_override_table); i++) {
430 const struct irq_override_cmp *entry = &skip_override_table[i];
432 if (dmi_check_system(entry->system) &&
434 entry->triggering == triggering &&
435 entry->polarity == polarity &&
436 entry->shareable == shareable)
443 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
444 u8 triggering, u8 polarity, u8 shareable,
449 if (!valid_IRQ(gsi)) {
450 irqresource_disabled(res, gsi);
455 * In IO-APIC mode, use overridden attribute. Two reasons:
456 * 1. BIOS bug in DSDT
457 * 2. BIOS uses IO-APIC mode Interrupt Source Override
459 * We do this only if we are dealing with IRQ() or IRQNoFlags()
460 * resource (the legacy ISA resources). With modern ACPI 5 devices
461 * using extended IRQ descriptors we take the IRQ configuration
462 * from _CRS directly.
464 if (check_override &&
465 acpi_dev_irq_override(gsi, triggering, polarity, shareable) &&
466 !acpi_get_override_irq(gsi, &t, &p)) {
467 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
468 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
470 if (triggering != trig || polarity != pol) {
471 pr_warn("ACPI: IRQ %d override to %s, %s\n", gsi,
472 t ? "level" : "edge", p ? "low" : "high");
478 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
479 irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
484 irqresource_disabled(res, gsi);
489 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
490 * @ares: Input ACPI resource object.
491 * @index: Index into the array of GSIs represented by the resource.
492 * @res: Output generic resource object.
494 * Check if the given ACPI resource object represents an interrupt resource
495 * and @index does not exceed the resource's interrupt count (true is returned
496 * in that case regardless of the results of the other checks)). If that's the
497 * case, register the GSI corresponding to @index from the array of interrupts
498 * represented by the resource and populate the generic resource object pointed
499 * to by @res accordingly. If the registration of the GSI is not successful,
500 * IORESOURCE_DISABLED will be set it that object's flags.
503 * 1) false with res->flags setting to zero: not the expected resource type
504 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
505 * 3) true: valid assigned resource
507 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
508 struct resource *res)
510 struct acpi_resource_irq *irq;
511 struct acpi_resource_extended_irq *ext_irq;
513 switch (ares->type) {
514 case ACPI_RESOURCE_TYPE_IRQ:
516 * Per spec, only one interrupt per descriptor is allowed in
517 * _CRS, but some firmware violates this, so parse them all.
519 irq = &ares->data.irq;
520 if (index >= irq->interrupt_count) {
521 irqresource_disabled(res, 0);
524 acpi_dev_get_irqresource(res, irq->interrupts[index],
525 irq->triggering, irq->polarity,
526 irq->shareable, true);
528 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
529 ext_irq = &ares->data.extended_irq;
530 if (index >= ext_irq->interrupt_count) {
531 irqresource_disabled(res, 0);
535 acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
536 ext_irq->triggering, ext_irq->polarity,
537 ext_irq->shareable, false);
539 irqresource_disabled(res, 0);
548 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
551 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
552 * @list: The head of the resource list to free.
554 void acpi_dev_free_resource_list(struct list_head *list)
556 resource_list_free(list);
558 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
560 struct res_proc_context {
561 struct list_head *list;
562 int (*preproc)(struct acpi_resource *, void *);
568 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
569 struct res_proc_context *c)
571 struct resource_entry *rentry;
573 rentry = resource_list_create_entry(NULL, 0);
578 *rentry->res = win->res;
579 rentry->offset = win->offset;
580 resource_list_add_tail(rentry, c->list);
585 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
588 struct res_proc_context *c = context;
589 struct resource_win win;
590 struct resource *res = &win.res;
596 ret = c->preproc(ares, c->preproc_data);
599 return AE_ABORT_METHOD;
600 } else if (ret > 0) {
605 memset(&win, 0, sizeof(win));
607 if (acpi_dev_resource_memory(ares, res)
608 || acpi_dev_resource_io(ares, res)
609 || acpi_dev_resource_address_space(ares, &win)
610 || acpi_dev_resource_ext_address_space(ares, &win))
611 return acpi_dev_new_resource_entry(&win, c);
613 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
616 status = acpi_dev_new_resource_entry(&win, c);
617 if (ACPI_FAILURE(status))
624 static int __acpi_dev_get_resources(struct acpi_device *adev,
625 struct list_head *list,
626 int (*preproc)(struct acpi_resource *, void *),
627 void *preproc_data, char *method)
629 struct res_proc_context c;
632 if (!adev || !adev->handle || !list_empty(list))
635 if (!acpi_has_method(adev->handle, method))
640 c.preproc_data = preproc_data;
643 status = acpi_walk_resources(adev->handle, method,
644 acpi_dev_process_resource, &c);
645 if (ACPI_FAILURE(status)) {
646 acpi_dev_free_resource_list(list);
647 return c.error ? c.error : -EIO;
654 * acpi_dev_get_resources - Get current resources of a device.
655 * @adev: ACPI device node to get the resources for.
656 * @list: Head of the resultant list of resources (must be empty).
657 * @preproc: The caller's preprocessing routine.
658 * @preproc_data: Pointer passed to the caller's preprocessing routine.
660 * Evaluate the _CRS method for the given device node and process its output by
661 * (1) executing the @preproc() routine provided by the caller, passing the
662 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
663 * returned and (2) converting all of the returned ACPI resources into struct
664 * resource objects if possible. If the return value of @preproc() in step (1)
665 * is different from 0, step (2) is not applied to the given ACPI resource and
666 * if that value is negative, the whole processing is aborted and that value is
667 * returned as the final error code.
669 * The resultant struct resource objects are put on the list pointed to by
670 * @list, that must be empty initially, as members of struct resource_entry
671 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
674 * The number of resources in the output list is returned on success, an error
675 * code reflecting the error condition is returned otherwise.
677 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
678 int (*preproc)(struct acpi_resource *, void *),
681 return __acpi_dev_get_resources(adev, list, preproc, preproc_data,
684 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
686 static int is_memory(struct acpi_resource *ares, void *not_used)
688 struct resource_win win;
689 struct resource *res = &win.res;
691 memset(&win, 0, sizeof(win));
693 return !(acpi_dev_resource_memory(ares, res)
694 || acpi_dev_resource_address_space(ares, &win)
695 || acpi_dev_resource_ext_address_space(ares, &win));
699 * acpi_dev_get_dma_resources - Get current DMA resources of a device.
700 * @adev: ACPI device node to get the resources for.
701 * @list: Head of the resultant list of resources (must be empty).
703 * Evaluate the _DMA method for the given device node and process its
706 * The resultant struct resource objects are put on the list pointed to
707 * by @list, that must be empty initially, as members of struct
708 * resource_entry objects. Callers of this routine should use
709 * %acpi_dev_free_resource_list() to free that list.
711 * The number of resources in the output list is returned on success,
712 * an error code reflecting the error condition is returned otherwise.
714 int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
716 return __acpi_dev_get_resources(adev, list, is_memory, NULL,
719 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
722 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
724 * @ares: Input ACPI resource object.
725 * @types: Valid resource types of IORESOURCE_XXX
727 * This is a helper function to support acpi_dev_get_resources(), which filters
728 * ACPI resource objects according to resource types.
730 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
733 unsigned long type = 0;
735 switch (ares->type) {
736 case ACPI_RESOURCE_TYPE_MEMORY24:
737 case ACPI_RESOURCE_TYPE_MEMORY32:
738 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
739 type = IORESOURCE_MEM;
741 case ACPI_RESOURCE_TYPE_IO:
742 case ACPI_RESOURCE_TYPE_FIXED_IO:
743 type = IORESOURCE_IO;
745 case ACPI_RESOURCE_TYPE_IRQ:
746 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
747 type = IORESOURCE_IRQ;
749 case ACPI_RESOURCE_TYPE_DMA:
750 case ACPI_RESOURCE_TYPE_FIXED_DMA:
751 type = IORESOURCE_DMA;
753 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
754 type = IORESOURCE_REG;
756 case ACPI_RESOURCE_TYPE_ADDRESS16:
757 case ACPI_RESOURCE_TYPE_ADDRESS32:
758 case ACPI_RESOURCE_TYPE_ADDRESS64:
759 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
760 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
761 type = IORESOURCE_MEM;
762 else if (ares->data.address.resource_type == ACPI_IO_RANGE)
763 type = IORESOURCE_IO;
764 else if (ares->data.address.resource_type ==
765 ACPI_BUS_NUMBER_RANGE)
766 type = IORESOURCE_BUS;
772 return (type & types) ? 0 : 1;
774 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
776 static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res)
778 struct list_head resource_list;
779 struct resource_entry *rentry;
782 INIT_LIST_HEAD(&resource_list);
783 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
787 list_for_each_entry(rentry, &resource_list, node) {
788 if (resource_contains(rentry->res, res)) {
795 acpi_dev_free_resource_list(&resource_list);
799 static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
800 void *context, void **ret)
802 struct resource *res = context;
803 struct acpi_device **consumer = (struct acpi_device **) ret;
804 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
809 if (acpi_dev_consumes_res(adev, res)) {
811 return AE_CTRL_TERMINATE;
818 * acpi_resource_consumer - Find the ACPI device that consumes @res.
819 * @res: Resource to search for.
821 * Search the current resource settings (_CRS) of every ACPI device node
822 * for @res. If we find an ACPI device whose _CRS includes @res, return
823 * it. Otherwise, return NULL.
825 struct acpi_device *acpi_resource_consumer(struct resource *res)
827 struct acpi_device *consumer = NULL;
829 acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer);