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))
23static 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 */
35static inline bool
36acpi_iospace_resource_valid(struct resource *res) { return true; }
37#endif
38
39#if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)
40static 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
46static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
47{
48 return true;
49}
50#endif
51
52static 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
72static 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(start: res->start, end: res->end, len, io: 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
84static 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 */
106bool 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, start: memory24->minimum << 8,
116 len: memory24->address_length << 8,
117 write_protect: memory24->write_protect);
118 break;
119 case ACPI_RESOURCE_TYPE_MEMORY32:
120 memory32 = &ares->data.memory32;
121 acpi_dev_get_memresource(res, start: memory32->minimum,
122 len: memory32->address_length,
123 write_protect: 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, start: fixed_memory32->address,
128 len: fixed_memory32->address_length,
129 write_protect: fixed_memory32->write_protect);
130 break;
131 default:
132 res->flags = 0;
133 return false;
134 }
135
136 return !(res->flags & IORESOURCE_DISABLED);
137}
138EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
139
140static 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(start: res->start, end: res->end, len, io: 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
157static 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, translation_type: 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 */
179bool 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, start: io->minimum,
188 len: io->address_length,
189 io_decode: 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, start: fixed_io->address,
194 len: 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}
204EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
205
206static 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, write_protect: wp);
253 break;
254 case ACPI_IO_RANGE:
255 acpi_dev_ioresource_flags(res, len, io_decode: iodec,
256 translation_type: 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 */
289bool 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, addr: (struct acpi_resource_address *)&addr,
299 attr: &addr.address);
300}
301EXPORT_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 */
318bool 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, addr: (struct acpi_resource_address *)ext_addr,
330 attr: &ext_addr->address);
331}
332EXPORT_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 * @wake_capable: Wake capability as provided by ACPI.
340 */
341unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable, u8 wake_capable)
342{
343 unsigned long flags;
344
345 if (triggering == ACPI_LEVEL_SENSITIVE)
346 flags = polarity == ACPI_ACTIVE_LOW ?
347 IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
348 else
349 flags = polarity == ACPI_ACTIVE_LOW ?
350 IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
351
352 if (shareable == ACPI_SHARED)
353 flags |= IORESOURCE_IRQ_SHAREABLE;
354
355 if (wake_capable == ACPI_WAKE_CAPABLE)
356 flags |= IORESOURCE_IRQ_WAKECAPABLE;
357
358 return flags | IORESOURCE_IRQ;
359}
360EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
361
362/**
363 * acpi_dev_get_irq_type - Determine irq type.
364 * @triggering: Triggering type as provided by ACPI.
365 * @polarity: Interrupt polarity as provided by ACPI.
366 */
367unsigned int acpi_dev_get_irq_type(int triggering, int polarity)
368{
369 switch (polarity) {
370 case ACPI_ACTIVE_LOW:
371 return triggering == ACPI_EDGE_SENSITIVE ?
372 IRQ_TYPE_EDGE_FALLING :
373 IRQ_TYPE_LEVEL_LOW;
374 case ACPI_ACTIVE_HIGH:
375 return triggering == ACPI_EDGE_SENSITIVE ?
376 IRQ_TYPE_EDGE_RISING :
377 IRQ_TYPE_LEVEL_HIGH;
378 case ACPI_ACTIVE_BOTH:
379 if (triggering == ACPI_EDGE_SENSITIVE)
380 return IRQ_TYPE_EDGE_BOTH;
381 fallthrough;
382 default:
383 return IRQ_TYPE_NONE;
384 }
385}
386EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
387
388/*
389 * DMI matches for boards where the DSDT specifies the kbd IRQ as
390 * level active-low and using the override changes this to rising edge,
391 * stopping the keyboard from working.
392 */
393static const struct dmi_system_id irq1_level_low_skip_override[] = {
394 {
395 /* MEDION P15651 */
396 .matches = {
397 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
398 DMI_MATCH(DMI_BOARD_NAME, "M15T"),
399 },
400 },
401 {
402 /* MEDION S17405 */
403 .matches = {
404 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
405 DMI_MATCH(DMI_BOARD_NAME, "M17T"),
406 },
407 },
408 {
409 /* MEDION S17413 */
410 .matches = {
411 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
412 DMI_MATCH(DMI_BOARD_NAME, "M1xA"),
413 },
414 },
415 {
416 /* Asus Vivobook K3402ZA */
417 .matches = {
418 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
419 DMI_MATCH(DMI_BOARD_NAME, "K3402ZA"),
420 },
421 },
422 {
423 /* Asus Vivobook K3502ZA */
424 .matches = {
425 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
426 DMI_MATCH(DMI_BOARD_NAME, "K3502ZA"),
427 },
428 },
429 {
430 /* Asus Vivobook S5402ZA */
431 .matches = {
432 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
433 DMI_MATCH(DMI_BOARD_NAME, "S5402ZA"),
434 },
435 },
436 {
437 /* Asus Vivobook S5602ZA */
438 .matches = {
439 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
440 DMI_MATCH(DMI_BOARD_NAME, "S5602ZA"),
441 },
442 },
443 {
444 /* Asus ExpertBook B1402CBA */
445 .matches = {
446 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
447 DMI_MATCH(DMI_BOARD_NAME, "B1402CBA"),
448 },
449 },
450 {
451 /* Asus ExpertBook B1502CBA */
452 .matches = {
453 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
454 DMI_MATCH(DMI_BOARD_NAME, "B1502CBA"),
455 },
456 },
457 {
458 /* Asus ExpertBook B2402CBA */
459 .matches = {
460 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
461 DMI_MATCH(DMI_BOARD_NAME, "B2402CBA"),
462 },
463 },
464 {
465 /* Asus ExpertBook B2402FBA */
466 .matches = {
467 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
468 DMI_MATCH(DMI_BOARD_NAME, "B2402FBA"),
469 },
470 },
471 {
472 /* Asus ExpertBook B2502 */
473 .matches = {
474 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
475 DMI_MATCH(DMI_BOARD_NAME, "B2502CBA"),
476 },
477 },
478 {
479 /* LG Electronics 17U70P */
480 .matches = {
481 DMI_MATCH(DMI_SYS_VENDOR, "LG Electronics"),
482 DMI_MATCH(DMI_BOARD_NAME, "17U70P"),
483 },
484 },
485 { }
486};
487
488/*
489 * DMI matches for AMD Zen boards where the DSDT specifies the kbd IRQ
490 * as falling edge and this must be overridden to rising edge,
491 * to have a working keyboard.
492 */
493static const struct dmi_system_id irq1_edge_low_force_override[] = {
494 {
495 /* TongFang GMxRGxx/XMG CORE 15 (M22)/TUXEDO Stellaris 15 Gen4 AMD */
496 .matches = {
497 DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"),
498 },
499 },
500 {
501 /* TongFang GMxXGxx/TUXEDO Polaris 15 Gen5 AMD */
502 .matches = {
503 DMI_MATCH(DMI_BOARD_NAME, "GMxXGxx"),
504 },
505 },
506 {
507 /* TongFang GM6XGxX/TUXEDO Stellaris 16 Gen5 AMD */
508 .matches = {
509 DMI_MATCH(DMI_BOARD_NAME, "GM6XGxX"),
510 },
511 },
512 {
513 /* MAINGEAR Vector Pro 2 15 */
514 .matches = {
515 DMI_MATCH(DMI_SYS_VENDOR, "Micro Electronics Inc"),
516 DMI_MATCH(DMI_PRODUCT_NAME, "MG-VCP2-15A3070T"),
517 }
518 },
519 {
520 /* MAINGEAR Vector Pro 2 17 */
521 .matches = {
522 DMI_MATCH(DMI_SYS_VENDOR, "Micro Electronics Inc"),
523 DMI_MATCH(DMI_PRODUCT_NAME, "MG-VCP2-17A3070T"),
524 },
525 },
526 {
527 /* TongFang GM6BGEQ / PCSpecialist Elimina Pro 16 M, RTX 3050 */
528 .matches = {
529 DMI_MATCH(DMI_BOARD_NAME, "GM6BGEQ"),
530 },
531 },
532 {
533 /* TongFang GM6BG5Q, RTX 4050 */
534 .matches = {
535 DMI_MATCH(DMI_BOARD_NAME, "GM6BG5Q"),
536 },
537 },
538 {
539 /* TongFang GM6BG0Q / PCSpecialist Elimina Pro 16 M, RTX 4060 */
540 .matches = {
541 DMI_MATCH(DMI_BOARD_NAME, "GM6BG0Q"),
542 },
543 },
544 { }
545};
546
547struct irq_override_cmp {
548 const struct dmi_system_id *system;
549 unsigned char irq;
550 unsigned char triggering;
551 unsigned char polarity;
552 unsigned char shareable;
553 bool override;
554};
555
556static const struct irq_override_cmp override_table[] = {
557 { irq1_level_low_skip_override, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
558 { irq1_edge_low_force_override, 1, ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_LOW, 1, true },
559};
560
561static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
562 u8 shareable)
563{
564 int i;
565
566 for (i = 0; i < ARRAY_SIZE(override_table); i++) {
567 const struct irq_override_cmp *entry = &override_table[i];
568
569 if (dmi_check_system(list: entry->system) &&
570 entry->irq == gsi &&
571 entry->triggering == triggering &&
572 entry->polarity == polarity &&
573 entry->shareable == shareable)
574 return entry->override;
575 }
576
577#ifdef CONFIG_X86
578 /*
579 * Always use the MADT override info, except for the i8042 PS/2 ctrl
580 * IRQs (1 and 12). For these the DSDT IRQ settings should sometimes
581 * be used otherwise PS/2 keyboards / mice will not work.
582 */
583 if (gsi != 1 && gsi != 12)
584 return true;
585
586 /* If the override comes from an INT_SRC_OVR MADT entry, honor it. */
587 if (acpi_int_src_ovr[gsi])
588 return true;
589
590 /*
591 * IRQ override isn't needed on modern AMD Zen systems and
592 * this override breaks active low IRQs on AMD Ryzen 6000 and
593 * newer systems. Skip it.
594 */
595 if (boot_cpu_has(X86_FEATURE_ZEN))
596 return false;
597#endif
598
599 return true;
600}
601
602static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
603 u8 triggering, u8 polarity, u8 shareable,
604 u8 wake_capable, bool check_override)
605{
606 int irq, p, t;
607
608 if (!valid_IRQ(gsi)) {
609 irqresource_disabled(res, irq: gsi);
610 return;
611 }
612
613 /*
614 * In IO-APIC mode, use overridden attribute. Two reasons:
615 * 1. BIOS bug in DSDT
616 * 2. BIOS uses IO-APIC mode Interrupt Source Override
617 *
618 * We do this only if we are dealing with IRQ() or IRQNoFlags()
619 * resource (the legacy ISA resources). With modern ACPI 5 devices
620 * using extended IRQ descriptors we take the IRQ configuration
621 * from _CRS directly.
622 */
623 if (check_override &&
624 acpi_dev_irq_override(gsi, triggering, polarity, shareable) &&
625 !acpi_get_override_irq(gsi, trigger: &t, polarity: &p)) {
626 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
627 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
628
629 if (triggering != trig || polarity != pol) {
630 pr_warn("ACPI: IRQ %d override to %s%s, %s%s\n", gsi,
631 t ? "level" : "edge",
632 trig == triggering ? "" : "(!)",
633 p ? "low" : "high",
634 pol == polarity ? "" : "(!)");
635 triggering = trig;
636 polarity = pol;
637 }
638 }
639
640 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
641 irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
642 if (irq >= 0) {
643 res->start = irq;
644 res->end = irq;
645 } else {
646 irqresource_disabled(res, irq: gsi);
647 }
648}
649
650/**
651 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
652 * @ares: Input ACPI resource object.
653 * @index: Index into the array of GSIs represented by the resource.
654 * @res: Output generic resource object.
655 *
656 * Check if the given ACPI resource object represents an interrupt resource
657 * and @index does not exceed the resource's interrupt count (true is returned
658 * in that case regardless of the results of the other checks)). If that's the
659 * case, register the GSI corresponding to @index from the array of interrupts
660 * represented by the resource and populate the generic resource object pointed
661 * to by @res accordingly. If the registration of the GSI is not successful,
662 * IORESOURCE_DISABLED will be set it that object's flags.
663 *
664 * Return:
665 * 1) false with res->flags setting to zero: not the expected resource type
666 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
667 * 3) true: valid assigned resource
668 */
669bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
670 struct resource *res)
671{
672 struct acpi_resource_irq *irq;
673 struct acpi_resource_extended_irq *ext_irq;
674
675 switch (ares->type) {
676 case ACPI_RESOURCE_TYPE_IRQ:
677 /*
678 * Per spec, only one interrupt per descriptor is allowed in
679 * _CRS, but some firmware violates this, so parse them all.
680 */
681 irq = &ares->data.irq;
682 if (index >= irq->interrupt_count) {
683 irqresource_disabled(res, irq: 0);
684 return false;
685 }
686 acpi_dev_get_irqresource(res, gsi: irq->interrupts[index],
687 triggering: irq->triggering, polarity: irq->polarity,
688 shareable: irq->shareable, wake_capable: irq->wake_capable,
689 check_override: true);
690 break;
691 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
692 ext_irq = &ares->data.extended_irq;
693 if (index >= ext_irq->interrupt_count) {
694 irqresource_disabled(res, irq: 0);
695 return false;
696 }
697 if (is_gsi(ext_irq))
698 acpi_dev_get_irqresource(res, gsi: ext_irq->interrupts[index],
699 triggering: ext_irq->triggering, polarity: ext_irq->polarity,
700 shareable: ext_irq->shareable, wake_capable: ext_irq->wake_capable,
701 check_override: false);
702 else
703 irqresource_disabled(res, irq: 0);
704 break;
705 default:
706 res->flags = 0;
707 return false;
708 }
709
710 return true;
711}
712EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
713
714/**
715 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
716 * @list: The head of the resource list to free.
717 */
718void acpi_dev_free_resource_list(struct list_head *list)
719{
720 resource_list_free(head: list);
721}
722EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
723
724struct res_proc_context {
725 struct list_head *list;
726 int (*preproc)(struct acpi_resource *, void *);
727 void *preproc_data;
728 int count;
729 int error;
730};
731
732static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
733 struct res_proc_context *c)
734{
735 struct resource_entry *rentry;
736
737 rentry = resource_list_create_entry(NULL, extra_size: 0);
738 if (!rentry) {
739 c->error = -ENOMEM;
740 return AE_NO_MEMORY;
741 }
742 *rentry->res = win->res;
743 rentry->offset = win->offset;
744 resource_list_add_tail(entry: rentry, head: c->list);
745 c->count++;
746 return AE_OK;
747}
748
749static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
750 void *context)
751{
752 struct res_proc_context *c = context;
753 struct resource_win win;
754 struct resource *res = &win.res;
755 int i;
756
757 if (c->preproc) {
758 int ret;
759
760 ret = c->preproc(ares, c->preproc_data);
761 if (ret < 0) {
762 c->error = ret;
763 return AE_ABORT_METHOD;
764 } else if (ret > 0) {
765 return AE_OK;
766 }
767 }
768
769 memset(&win, 0, sizeof(win));
770
771 if (acpi_dev_resource_memory(ares, res)
772 || acpi_dev_resource_io(ares, res)
773 || acpi_dev_resource_address_space(ares, &win)
774 || acpi_dev_resource_ext_address_space(ares, &win))
775 return acpi_dev_new_resource_entry(win: &win, c);
776
777 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
778 acpi_status status;
779
780 status = acpi_dev_new_resource_entry(win: &win, c);
781 if (ACPI_FAILURE(status))
782 return status;
783 }
784
785 return AE_OK;
786}
787
788static int __acpi_dev_get_resources(struct acpi_device *adev,
789 struct list_head *list,
790 int (*preproc)(struct acpi_resource *, void *),
791 void *preproc_data, char *method)
792{
793 struct res_proc_context c;
794 acpi_status status;
795
796 if (!adev || !adev->handle || !list_empty(head: list))
797 return -EINVAL;
798
799 if (!acpi_has_method(handle: adev->handle, name: method))
800 return 0;
801
802 c.list = list;
803 c.preproc = preproc;
804 c.preproc_data = preproc_data;
805 c.count = 0;
806 c.error = 0;
807 status = acpi_walk_resources(device: adev->handle, name: method,
808 user_function: acpi_dev_process_resource, context: &c);
809 if (ACPI_FAILURE(status)) {
810 acpi_dev_free_resource_list(list);
811 return c.error ? c.error : -EIO;
812 }
813
814 return c.count;
815}
816
817/**
818 * acpi_dev_get_resources - Get current resources of a device.
819 * @adev: ACPI device node to get the resources for.
820 * @list: Head of the resultant list of resources (must be empty).
821 * @preproc: The caller's preprocessing routine.
822 * @preproc_data: Pointer passed to the caller's preprocessing routine.
823 *
824 * Evaluate the _CRS method for the given device node and process its output by
825 * (1) executing the @preproc() routine provided by the caller, passing the
826 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
827 * returned and (2) converting all of the returned ACPI resources into struct
828 * resource objects if possible. If the return value of @preproc() in step (1)
829 * is different from 0, step (2) is not applied to the given ACPI resource and
830 * if that value is negative, the whole processing is aborted and that value is
831 * returned as the final error code.
832 *
833 * The resultant struct resource objects are put on the list pointed to by
834 * @list, that must be empty initially, as members of struct resource_entry
835 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
836 * free that list.
837 *
838 * The number of resources in the output list is returned on success, an error
839 * code reflecting the error condition is returned otherwise.
840 */
841int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
842 int (*preproc)(struct acpi_resource *, void *),
843 void *preproc_data)
844{
845 return __acpi_dev_get_resources(adev, list, preproc, preproc_data,
846 METHOD_NAME__CRS);
847}
848EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
849
850static int is_memory(struct acpi_resource *ares, void *not_used)
851{
852 struct resource_win win;
853 struct resource *res = &win.res;
854
855 memset(&win, 0, sizeof(win));
856
857 if (acpi_dev_filter_resource_type(ares, IORESOURCE_MEM))
858 return 1;
859
860 return !(acpi_dev_resource_memory(ares, res)
861 || acpi_dev_resource_address_space(ares, &win)
862 || acpi_dev_resource_ext_address_space(ares, &win));
863}
864
865/**
866 * acpi_dev_get_dma_resources - Get current DMA resources of a device.
867 * @adev: ACPI device node to get the resources for.
868 * @list: Head of the resultant list of resources (must be empty).
869 *
870 * Evaluate the _DMA method for the given device node and process its
871 * output.
872 *
873 * The resultant struct resource objects are put on the list pointed to
874 * by @list, that must be empty initially, as members of struct
875 * resource_entry objects. Callers of this routine should use
876 * %acpi_dev_free_resource_list() to free that list.
877 *
878 * The number of resources in the output list is returned on success,
879 * an error code reflecting the error condition is returned otherwise.
880 */
881int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
882{
883 return __acpi_dev_get_resources(adev, list, preproc: is_memory, NULL,
884 METHOD_NAME__DMA);
885}
886EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
887
888/**
889 * acpi_dev_get_memory_resources - Get current memory resources of a device.
890 * @adev: ACPI device node to get the resources for.
891 * @list: Head of the resultant list of resources (must be empty).
892 *
893 * This is a helper function that locates all memory type resources of @adev
894 * with acpi_dev_get_resources().
895 *
896 * The number of resources in the output list is returned on success, an error
897 * code reflecting the error condition is returned otherwise.
898 */
899int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list)
900{
901 return acpi_dev_get_resources(adev, list, is_memory, NULL);
902}
903EXPORT_SYMBOL_GPL(acpi_dev_get_memory_resources);
904
905/**
906 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
907 * types
908 * @ares: Input ACPI resource object.
909 * @types: Valid resource types of IORESOURCE_XXX
910 *
911 * This is a helper function to support acpi_dev_get_resources(), which filters
912 * ACPI resource objects according to resource types.
913 */
914int acpi_dev_filter_resource_type(struct acpi_resource *ares,
915 unsigned long types)
916{
917 unsigned long type = 0;
918
919 switch (ares->type) {
920 case ACPI_RESOURCE_TYPE_MEMORY24:
921 case ACPI_RESOURCE_TYPE_MEMORY32:
922 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
923 type = IORESOURCE_MEM;
924 break;
925 case ACPI_RESOURCE_TYPE_IO:
926 case ACPI_RESOURCE_TYPE_FIXED_IO:
927 type = IORESOURCE_IO;
928 break;
929 case ACPI_RESOURCE_TYPE_IRQ:
930 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
931 type = IORESOURCE_IRQ;
932 break;
933 case ACPI_RESOURCE_TYPE_DMA:
934 case ACPI_RESOURCE_TYPE_FIXED_DMA:
935 type = IORESOURCE_DMA;
936 break;
937 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
938 type = IORESOURCE_REG;
939 break;
940 case ACPI_RESOURCE_TYPE_ADDRESS16:
941 case ACPI_RESOURCE_TYPE_ADDRESS32:
942 case ACPI_RESOURCE_TYPE_ADDRESS64:
943 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
944 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
945 type = IORESOURCE_MEM;
946 else if (ares->data.address.resource_type == ACPI_IO_RANGE)
947 type = IORESOURCE_IO;
948 else if (ares->data.address.resource_type ==
949 ACPI_BUS_NUMBER_RANGE)
950 type = IORESOURCE_BUS;
951 break;
952 default:
953 break;
954 }
955
956 return (type & types) ? 0 : 1;
957}
958EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
959
960static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res)
961{
962 struct list_head resource_list;
963 struct resource_entry *rentry;
964 int ret, found = 0;
965
966 INIT_LIST_HEAD(list: &resource_list);
967 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
968 if (ret < 0)
969 return 0;
970
971 list_for_each_entry(rentry, &resource_list, node) {
972 if (resource_contains(r1: rentry->res, r2: res)) {
973 found = 1;
974 break;
975 }
976
977 }
978
979 acpi_dev_free_resource_list(&resource_list);
980 return found;
981}
982
983static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
984 void *context, void **ret)
985{
986 struct resource *res = context;
987 struct acpi_device **consumer = (struct acpi_device **) ret;
988 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
989
990 if (!adev)
991 return AE_OK;
992
993 if (acpi_dev_consumes_res(adev, res)) {
994 *consumer = adev;
995 return AE_CTRL_TERMINATE;
996 }
997
998 return AE_OK;
999}
1000
1001/**
1002 * acpi_resource_consumer - Find the ACPI device that consumes @res.
1003 * @res: Resource to search for.
1004 *
1005 * Search the current resource settings (_CRS) of every ACPI device node
1006 * for @res. If we find an ACPI device whose _CRS includes @res, return
1007 * it. Otherwise, return NULL.
1008 */
1009struct acpi_device *acpi_resource_consumer(struct resource *res)
1010{
1011 struct acpi_device *consumer = NULL;
1012
1013 acpi_get_devices(NULL, user_function: acpi_res_consumer_cb, context: res, return_value: (void **) &consumer);
1014 return consumer;
1015}
1016

source code of linux/drivers/acpi/resource.c