xref: /openbmc/linux/drivers/acpi/resource.c (revision c9933d49)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/acpi/resource.c - ACPI device resources interpretation.
4  *
5  * Copyright (C) 2012, Intel Corp.
6  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  */
12 
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>
20 
21 #ifdef CONFIG_X86
22 #define valid_IRQ(i) (((i) != 0) && ((i) != 2))
23 static inline bool acpi_iospace_resource_valid(struct resource *res)
24 {
25 	/* On X86 IO space is limited to the [0 - 64K] IO port range */
26 	return res->end < 0x10003;
27 }
28 #else
29 #define valid_IRQ(i) (true)
30 /*
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.
34  */
35 static inline bool
36 acpi_iospace_resource_valid(struct resource *res) { return true; }
37 #endif
38 
39 #if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)
40 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
41 {
42 	return ext_irq->resource_source.string_length == 0 &&
43 	       ext_irq->producer_consumer == ACPI_CONSUMER;
44 }
45 #else
46 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
47 {
48 	return true;
49 }
50 #endif
51 
52 static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
53 {
54 	u64 reslen = end - start + 1;
55 
56 	/*
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.
62 	 */
63 	if (len && reslen && start <= end)
64 		return true;
65 
66 	pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
67 		io ? "io" : "mem", start, end, len);
68 
69 	return false;
70 }
71 
72 static void acpi_dev_memresource_flags(struct resource *res, u64 len,
73 				       u8 write_protect)
74 {
75 	res->flags = IORESOURCE_MEM;
76 
77 	if (!acpi_dev_resource_len_valid(res->start, res->end, len, false))
78 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
79 
80 	if (write_protect == ACPI_READ_WRITE_MEMORY)
81 		res->flags |= IORESOURCE_MEM_WRITEABLE;
82 }
83 
84 static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
85 				     u8 write_protect)
86 {
87 	res->start = start;
88 	res->end = start + len - 1;
89 	acpi_dev_memresource_flags(res, len, write_protect);
90 }
91 
92 /**
93  * acpi_dev_resource_memory - Extract ACPI memory resource information.
94  * @ares: Input ACPI resource object.
95  * @res: Output generic resource object.
96  *
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.
100  *
101  * Return:
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
105  */
106 bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
107 {
108 	struct acpi_resource_memory24 *memory24;
109 	struct acpi_resource_memory32 *memory32;
110 	struct acpi_resource_fixed_memory32 *fixed_memory32;
111 
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);
118 		break;
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);
124 		break;
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);
130 		break;
131 	default:
132 		res->flags = 0;
133 		return false;
134 	}
135 
136 	return !(res->flags & IORESOURCE_DISABLED);
137 }
138 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
139 
140 static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
141 				      u8 io_decode, u8 translation_type)
142 {
143 	res->flags = IORESOURCE_IO;
144 
145 	if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
146 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
147 
148 	if (!acpi_iospace_resource_valid(res))
149 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
150 
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;
155 }
156 
157 static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
158 				    u8 io_decode)
159 {
160 	res->start = start;
161 	res->end = start + len - 1;
162 	acpi_dev_ioresource_flags(res, len, io_decode, 0);
163 }
164 
165 /**
166  * acpi_dev_resource_io - Extract ACPI I/O resource information.
167  * @ares: Input ACPI resource object.
168  * @res: Output generic resource object.
169  *
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.
173  *
174  * Return:
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
178  */
179 bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
180 {
181 	struct acpi_resource_io *io;
182 	struct acpi_resource_fixed_io *fixed_io;
183 
184 	switch (ares->type) {
185 	case ACPI_RESOURCE_TYPE_IO:
186 		io = &ares->data.io;
187 		acpi_dev_get_ioresource(res, io->minimum,
188 					io->address_length,
189 					io->io_decode);
190 		break;
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,
195 					ACPI_DECODE_10);
196 		break;
197 	default:
198 		res->flags = 0;
199 		return false;
200 	}
201 
202 	return !(res->flags & IORESOURCE_DISABLED);
203 }
204 EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
205 
206 static bool acpi_decode_space(struct resource_win *win,
207 			      struct acpi_resource_address *addr,
208 			      struct acpi_address64_attribute *attr)
209 {
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;
215 
216 	/*
217 	 * Filter out invalid descriptor according to ACPI Spec 5.0, section
218 	 * 6.4.3.5 Address Space Resource Descriptors.
219 	 */
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);
224 
225 	/*
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.
231 	 */
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;
239 
240 	win->offset = offset;
241 	res->start = start;
242 	res->end = end;
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);
247 		return false;
248 	}
249 
250 	switch (addr->resource_type) {
251 	case ACPI_MEMORY_RANGE:
252 		acpi_dev_memresource_flags(res, len, wp);
253 		break;
254 	case ACPI_IO_RANGE:
255 		acpi_dev_ioresource_flags(res, len, iodec,
256 					  addr->info.io.translation_type);
257 		break;
258 	case ACPI_BUS_NUMBER_RANGE:
259 		res->flags = IORESOURCE_BUS;
260 		break;
261 	default:
262 		return false;
263 	}
264 
265 	if (addr->producer_consumer == ACPI_PRODUCER)
266 		res->flags |= IORESOURCE_WINDOW;
267 
268 	if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
269 		res->flags |= IORESOURCE_PREFETCH;
270 
271 	return !(res->flags & IORESOURCE_DISABLED);
272 }
273 
274 /**
275  * acpi_dev_resource_address_space - Extract ACPI address space information.
276  * @ares: Input ACPI resource object.
277  * @win: Output generic resource object.
278  *
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.
282  *
283  * Return:
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
286  *    resource
287  * 3) true: valid assigned resource
288  */
289 bool acpi_dev_resource_address_space(struct acpi_resource *ares,
290 				     struct resource_win *win)
291 {
292 	struct acpi_resource_address64 addr;
293 
294 	win->res.flags = 0;
295 	if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
296 		return false;
297 
298 	return acpi_decode_space(win, (struct acpi_resource_address *)&addr,
299 				 &addr.address);
300 }
301 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
302 
303 /**
304  * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
305  * @ares: Input ACPI resource object.
306  * @win: Output generic resource object.
307  *
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.
311  *
312  * Return:
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
315  *    resource
316  * 3) true: valid assigned resource
317  */
318 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
319 					 struct resource_win *win)
320 {
321 	struct acpi_resource_extended_address64 *ext_addr;
322 
323 	win->res.flags = 0;
324 	if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
325 		return false;
326 
327 	ext_addr = &ares->data.ext_address64;
328 
329 	return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,
330 				 &ext_addr->address);
331 }
332 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
333 
334 /**
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.
339  */
340 unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
341 {
342 	unsigned long flags;
343 
344 	if (triggering == ACPI_LEVEL_SENSITIVE)
345 		flags = polarity == ACPI_ACTIVE_LOW ?
346 			IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
347 	else
348 		flags = polarity == ACPI_ACTIVE_LOW ?
349 			IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
350 
351 	if (shareable == ACPI_SHARED)
352 		flags |= IORESOURCE_IRQ_SHAREABLE;
353 
354 	return flags | IORESOURCE_IRQ;
355 }
356 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
357 
358 /**
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.
362  */
363 unsigned int acpi_dev_get_irq_type(int triggering, int polarity)
364 {
365 	switch (polarity) {
366 	case ACPI_ACTIVE_LOW:
367 		return triggering == ACPI_EDGE_SENSITIVE ?
368 		       IRQ_TYPE_EDGE_FALLING :
369 		       IRQ_TYPE_LEVEL_LOW;
370 	case ACPI_ACTIVE_HIGH:
371 		return triggering == ACPI_EDGE_SENSITIVE ?
372 		       IRQ_TYPE_EDGE_RISING :
373 		       IRQ_TYPE_LEVEL_HIGH;
374 	case ACPI_ACTIVE_BOTH:
375 		if (triggering == ACPI_EDGE_SENSITIVE)
376 			return IRQ_TYPE_EDGE_BOTH;
377 		fallthrough;
378 	default:
379 		return IRQ_TYPE_NONE;
380 	}
381 }
382 EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
383 
384 static const struct dmi_system_id medion_laptop[] = {
385 	{
386 		.ident = "MEDION P15651",
387 		.matches = {
388 			DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
389 			DMI_MATCH(DMI_BOARD_NAME, "M15T"),
390 		},
391 	},
392 	{
393 		.ident = "MEDION S17405",
394 		.matches = {
395 			DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
396 			DMI_MATCH(DMI_BOARD_NAME, "M17T"),
397 		},
398 	},
399 	{ }
400 };
401 
402 struct irq_override_cmp {
403 	const struct dmi_system_id *system;
404 	unsigned char irq;
405 	unsigned char triggering;
406 	unsigned char polarity;
407 	unsigned char shareable;
408 };
409 
410 static const struct irq_override_cmp skip_override_table[] = {
411 	{ medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0 },
412 };
413 
414 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
415 				  u8 shareable)
416 {
417 	int i;
418 
419 	for (i = 0; i < ARRAY_SIZE(skip_override_table); i++) {
420 		const struct irq_override_cmp *entry = &skip_override_table[i];
421 
422 		if (dmi_check_system(entry->system) &&
423 		    entry->irq == gsi &&
424 		    entry->triggering == triggering &&
425 		    entry->polarity == polarity &&
426 		    entry->shareable == shareable)
427 			return false;
428 	}
429 
430 	return true;
431 }
432 
433 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
434 				     u8 triggering, u8 polarity, u8 shareable,
435 				     bool check_override)
436 {
437 	int irq, p, t;
438 
439 	if (!valid_IRQ(gsi)) {
440 		irqresource_disabled(res, gsi);
441 		return;
442 	}
443 
444 	/*
445 	 * In IO-APIC mode, use overridden attribute. Two reasons:
446 	 * 1. BIOS bug in DSDT
447 	 * 2. BIOS uses IO-APIC mode Interrupt Source Override
448 	 *
449 	 * We do this only if we are dealing with IRQ() or IRQNoFlags()
450 	 * resource (the legacy ISA resources). With modern ACPI 5 devices
451 	 * using extended IRQ descriptors we take the IRQ configuration
452 	 * from _CRS directly.
453 	 */
454 	if (check_override &&
455 	    acpi_dev_irq_override(gsi, triggering, polarity, shareable) &&
456 	    !acpi_get_override_irq(gsi, &t, &p)) {
457 		u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
458 		u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
459 
460 		if (triggering != trig || polarity != pol) {
461 			pr_warn("ACPI: IRQ %d override to %s, %s\n", gsi,
462 				t ? "level" : "edge", p ? "low" : "high");
463 			triggering = trig;
464 			polarity = pol;
465 		}
466 	}
467 
468 	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
469 	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
470 	if (irq >= 0) {
471 		res->start = irq;
472 		res->end = irq;
473 	} else {
474 		irqresource_disabled(res, gsi);
475 	}
476 }
477 
478 /**
479  * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
480  * @ares: Input ACPI resource object.
481  * @index: Index into the array of GSIs represented by the resource.
482  * @res: Output generic resource object.
483  *
484  * Check if the given ACPI resource object represents an interrupt resource
485  * and @index does not exceed the resource's interrupt count (true is returned
486  * in that case regardless of the results of the other checks)).  If that's the
487  * case, register the GSI corresponding to @index from the array of interrupts
488  * represented by the resource and populate the generic resource object pointed
489  * to by @res accordingly.  If the registration of the GSI is not successful,
490  * IORESOURCE_DISABLED will be set it that object's flags.
491  *
492  * Return:
493  * 1) false with res->flags setting to zero: not the expected resource type
494  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
495  * 3) true: valid assigned resource
496  */
497 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
498 				 struct resource *res)
499 {
500 	struct acpi_resource_irq *irq;
501 	struct acpi_resource_extended_irq *ext_irq;
502 
503 	switch (ares->type) {
504 	case ACPI_RESOURCE_TYPE_IRQ:
505 		/*
506 		 * Per spec, only one interrupt per descriptor is allowed in
507 		 * _CRS, but some firmware violates this, so parse them all.
508 		 */
509 		irq = &ares->data.irq;
510 		if (index >= irq->interrupt_count) {
511 			irqresource_disabled(res, 0);
512 			return false;
513 		}
514 		acpi_dev_get_irqresource(res, irq->interrupts[index],
515 					 irq->triggering, irq->polarity,
516 					 irq->shareable, true);
517 		break;
518 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
519 		ext_irq = &ares->data.extended_irq;
520 		if (index >= ext_irq->interrupt_count) {
521 			irqresource_disabled(res, 0);
522 			return false;
523 		}
524 		if (is_gsi(ext_irq))
525 			acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
526 					 ext_irq->triggering, ext_irq->polarity,
527 					 ext_irq->shareable, false);
528 		else
529 			irqresource_disabled(res, 0);
530 		break;
531 	default:
532 		res->flags = 0;
533 		return false;
534 	}
535 
536 	return true;
537 }
538 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
539 
540 /**
541  * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
542  * @list: The head of the resource list to free.
543  */
544 void acpi_dev_free_resource_list(struct list_head *list)
545 {
546 	resource_list_free(list);
547 }
548 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
549 
550 struct res_proc_context {
551 	struct list_head *list;
552 	int (*preproc)(struct acpi_resource *, void *);
553 	void *preproc_data;
554 	int count;
555 	int error;
556 };
557 
558 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
559 					       struct res_proc_context *c)
560 {
561 	struct resource_entry *rentry;
562 
563 	rentry = resource_list_create_entry(NULL, 0);
564 	if (!rentry) {
565 		c->error = -ENOMEM;
566 		return AE_NO_MEMORY;
567 	}
568 	*rentry->res = win->res;
569 	rentry->offset = win->offset;
570 	resource_list_add_tail(rentry, c->list);
571 	c->count++;
572 	return AE_OK;
573 }
574 
575 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
576 					     void *context)
577 {
578 	struct res_proc_context *c = context;
579 	struct resource_win win;
580 	struct resource *res = &win.res;
581 	int i;
582 
583 	if (c->preproc) {
584 		int ret;
585 
586 		ret = c->preproc(ares, c->preproc_data);
587 		if (ret < 0) {
588 			c->error = ret;
589 			return AE_ABORT_METHOD;
590 		} else if (ret > 0) {
591 			return AE_OK;
592 		}
593 	}
594 
595 	memset(&win, 0, sizeof(win));
596 
597 	if (acpi_dev_resource_memory(ares, res)
598 	    || acpi_dev_resource_io(ares, res)
599 	    || acpi_dev_resource_address_space(ares, &win)
600 	    || acpi_dev_resource_ext_address_space(ares, &win))
601 		return acpi_dev_new_resource_entry(&win, c);
602 
603 	for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
604 		acpi_status status;
605 
606 		status = acpi_dev_new_resource_entry(&win, c);
607 		if (ACPI_FAILURE(status))
608 			return status;
609 	}
610 
611 	return AE_OK;
612 }
613 
614 static int __acpi_dev_get_resources(struct acpi_device *adev,
615 				    struct list_head *list,
616 				    int (*preproc)(struct acpi_resource *, void *),
617 				    void *preproc_data, char *method)
618 {
619 	struct res_proc_context c;
620 	acpi_status status;
621 
622 	if (!adev || !adev->handle || !list_empty(list))
623 		return -EINVAL;
624 
625 	if (!acpi_has_method(adev->handle, method))
626 		return 0;
627 
628 	c.list = list;
629 	c.preproc = preproc;
630 	c.preproc_data = preproc_data;
631 	c.count = 0;
632 	c.error = 0;
633 	status = acpi_walk_resources(adev->handle, method,
634 				     acpi_dev_process_resource, &c);
635 	if (ACPI_FAILURE(status)) {
636 		acpi_dev_free_resource_list(list);
637 		return c.error ? c.error : -EIO;
638 	}
639 
640 	return c.count;
641 }
642 
643 /**
644  * acpi_dev_get_resources - Get current resources of a device.
645  * @adev: ACPI device node to get the resources for.
646  * @list: Head of the resultant list of resources (must be empty).
647  * @preproc: The caller's preprocessing routine.
648  * @preproc_data: Pointer passed to the caller's preprocessing routine.
649  *
650  * Evaluate the _CRS method for the given device node and process its output by
651  * (1) executing the @preproc() routine provided by the caller, passing the
652  * resource pointer and @preproc_data to it as arguments, for each ACPI resource
653  * returned and (2) converting all of the returned ACPI resources into struct
654  * resource objects if possible.  If the return value of @preproc() in step (1)
655  * is different from 0, step (2) is not applied to the given ACPI resource and
656  * if that value is negative, the whole processing is aborted and that value is
657  * returned as the final error code.
658  *
659  * The resultant struct resource objects are put on the list pointed to by
660  * @list, that must be empty initially, as members of struct resource_entry
661  * objects.  Callers of this routine should use %acpi_dev_free_resource_list() to
662  * free that list.
663  *
664  * The number of resources in the output list is returned on success, an error
665  * code reflecting the error condition is returned otherwise.
666  */
667 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
668 			   int (*preproc)(struct acpi_resource *, void *),
669 			   void *preproc_data)
670 {
671 	return __acpi_dev_get_resources(adev, list, preproc, preproc_data,
672 					METHOD_NAME__CRS);
673 }
674 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
675 
676 static int is_memory(struct acpi_resource *ares, void *not_used)
677 {
678 	struct resource_win win;
679 	struct resource *res = &win.res;
680 
681 	memset(&win, 0, sizeof(win));
682 
683 	return !(acpi_dev_resource_memory(ares, res)
684 	       || acpi_dev_resource_address_space(ares, &win)
685 	       || acpi_dev_resource_ext_address_space(ares, &win));
686 }
687 
688 /**
689  * acpi_dev_get_dma_resources - Get current DMA resources of a device.
690  * @adev: ACPI device node to get the resources for.
691  * @list: Head of the resultant list of resources (must be empty).
692  *
693  * Evaluate the _DMA method for the given device node and process its
694  * output.
695  *
696  * The resultant struct resource objects are put on the list pointed to
697  * by @list, that must be empty initially, as members of struct
698  * resource_entry objects.  Callers of this routine should use
699  * %acpi_dev_free_resource_list() to free that list.
700  *
701  * The number of resources in the output list is returned on success,
702  * an error code reflecting the error condition is returned otherwise.
703  */
704 int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
705 {
706 	return __acpi_dev_get_resources(adev, list, is_memory, NULL,
707 					METHOD_NAME__DMA);
708 }
709 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
710 
711 /**
712  * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
713  *				   types
714  * @ares: Input ACPI resource object.
715  * @types: Valid resource types of IORESOURCE_XXX
716  *
717  * This is a helper function to support acpi_dev_get_resources(), which filters
718  * ACPI resource objects according to resource types.
719  */
720 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
721 				  unsigned long types)
722 {
723 	unsigned long type = 0;
724 
725 	switch (ares->type) {
726 	case ACPI_RESOURCE_TYPE_MEMORY24:
727 	case ACPI_RESOURCE_TYPE_MEMORY32:
728 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
729 		type = IORESOURCE_MEM;
730 		break;
731 	case ACPI_RESOURCE_TYPE_IO:
732 	case ACPI_RESOURCE_TYPE_FIXED_IO:
733 		type = IORESOURCE_IO;
734 		break;
735 	case ACPI_RESOURCE_TYPE_IRQ:
736 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
737 		type = IORESOURCE_IRQ;
738 		break;
739 	case ACPI_RESOURCE_TYPE_DMA:
740 	case ACPI_RESOURCE_TYPE_FIXED_DMA:
741 		type = IORESOURCE_DMA;
742 		break;
743 	case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
744 		type = IORESOURCE_REG;
745 		break;
746 	case ACPI_RESOURCE_TYPE_ADDRESS16:
747 	case ACPI_RESOURCE_TYPE_ADDRESS32:
748 	case ACPI_RESOURCE_TYPE_ADDRESS64:
749 	case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
750 		if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
751 			type = IORESOURCE_MEM;
752 		else if (ares->data.address.resource_type == ACPI_IO_RANGE)
753 			type = IORESOURCE_IO;
754 		else if (ares->data.address.resource_type ==
755 			 ACPI_BUS_NUMBER_RANGE)
756 			type = IORESOURCE_BUS;
757 		break;
758 	default:
759 		break;
760 	}
761 
762 	return (type & types) ? 0 : 1;
763 }
764 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
765 
766 static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res)
767 {
768 	struct list_head resource_list;
769 	struct resource_entry *rentry;
770 	int ret, found = 0;
771 
772 	INIT_LIST_HEAD(&resource_list);
773 	ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
774 	if (ret < 0)
775 		return 0;
776 
777 	list_for_each_entry(rentry, &resource_list, node) {
778 		if (resource_contains(rentry->res, res)) {
779 			found = 1;
780 			break;
781 		}
782 
783 	}
784 
785 	acpi_dev_free_resource_list(&resource_list);
786 	return found;
787 }
788 
789 static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
790 					 void *context, void **ret)
791 {
792 	struct resource *res = context;
793 	struct acpi_device **consumer = (struct acpi_device **) ret;
794 	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
795 
796 	if (!adev)
797 		return AE_OK;
798 
799 	if (acpi_dev_consumes_res(adev, res)) {
800 		*consumer = adev;
801 		return AE_CTRL_TERMINATE;
802 	}
803 
804 	return AE_OK;
805 }
806 
807 /**
808  * acpi_resource_consumer - Find the ACPI device that consumes @res.
809  * @res: Resource to search for.
810  *
811  * Search the current resource settings (_CRS) of every ACPI device node
812  * for @res.  If we find an ACPI device whose _CRS includes @res, return
813  * it.  Otherwise, return NULL.
814  */
815 struct acpi_device *acpi_resource_consumer(struct resource *res)
816 {
817 	struct acpi_device *consumer = NULL;
818 
819 	acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer);
820 	return consumer;
821 }
822