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))
acpi_iospace_resource_valid(struct resource * res)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
acpi_iospace_resource_valid(struct resource * res)36 acpi_iospace_resource_valid(struct resource *res) { return true; }
37 #endif
38
39 #if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)
is_gsi(struct acpi_resource_extended_irq * ext_irq)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
is_gsi(struct acpi_resource_extended_irq * ext_irq)46 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
47 {
48 return true;
49 }
50 #endif
51
acpi_dev_resource_len_valid(u64 start,u64 end,u64 len,bool io)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
acpi_dev_memresource_flags(struct resource * res,u64 len,u8 write_protect)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
acpi_dev_get_memresource(struct resource * res,u64 start,u64 len,u8 write_protect)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 */
acpi_dev_resource_memory(struct acpi_resource * ares,struct resource * res)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
acpi_dev_ioresource_flags(struct resource * res,u64 len,u8 io_decode,u8 translation_type)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
acpi_dev_get_ioresource(struct resource * res,u64 start,u64 len,u8 io_decode)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 */
acpi_dev_resource_io(struct acpi_resource * ares,struct resource * res)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
acpi_decode_space(struct resource_win * win,struct acpi_resource_address * addr,struct acpi_address64_attribute * attr)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 */
acpi_dev_resource_address_space(struct acpi_resource * ares,struct resource_win * win)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 */
acpi_dev_resource_ext_address_space(struct acpi_resource * ares,struct resource_win * win)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 * @wake_capable: Wake capability as provided by ACPI.
340 */
acpi_dev_irq_flags(u8 triggering,u8 polarity,u8 shareable,u8 wake_capable)341 unsigned 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 }
360 EXPORT_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 */
acpi_dev_get_irq_type(int triggering,int polarity)367 unsigned 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 }
386 EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
387
388 static const struct dmi_system_id medion_laptop[] = {
389 {
390 .ident = "MEDION P15651",
391 .matches = {
392 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
393 DMI_MATCH(DMI_BOARD_NAME, "M15T"),
394 },
395 },
396 {
397 .ident = "MEDION S17405",
398 .matches = {
399 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
400 DMI_MATCH(DMI_BOARD_NAME, "M17T"),
401 },
402 },
403 { }
404 };
405
406 static const struct dmi_system_id asus_laptop[] = {
407 {
408 .ident = "Asus Vivobook K3402ZA",
409 .matches = {
410 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
411 DMI_MATCH(DMI_BOARD_NAME, "K3402ZA"),
412 },
413 },
414 {
415 .ident = "Asus Vivobook K3502ZA",
416 .matches = {
417 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
418 DMI_MATCH(DMI_BOARD_NAME, "K3502ZA"),
419 },
420 },
421 {
422 .ident = "Asus Vivobook S5402ZA",
423 .matches = {
424 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
425 DMI_MATCH(DMI_BOARD_NAME, "S5402ZA"),
426 },
427 },
428 {
429 .ident = "Asus Vivobook S5602ZA",
430 .matches = {
431 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
432 DMI_MATCH(DMI_BOARD_NAME, "S5602ZA"),
433 },
434 },
435 { }
436 };
437
438 static const struct dmi_system_id lenovo_82ra[] = {
439 {
440 .ident = "LENOVO IdeaPad Flex 5 16ALC7",
441 .matches = {
442 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "82RA"),
444 },
445 },
446 { }
447 };
448
449 struct irq_override_cmp {
450 const struct dmi_system_id *system;
451 unsigned char irq;
452 unsigned char triggering;
453 unsigned char polarity;
454 unsigned char shareable;
455 bool override;
456 };
457
458 static const struct irq_override_cmp override_table[] = {
459 { medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
460 { asus_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
461 { lenovo_82ra, 6, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
462 { lenovo_82ra, 10, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
463 };
464
acpi_dev_irq_override(u32 gsi,u8 triggering,u8 polarity,u8 shareable)465 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
466 u8 shareable)
467 {
468 int i;
469
470 for (i = 0; i < ARRAY_SIZE(override_table); i++) {
471 const struct irq_override_cmp *entry = &override_table[i];
472
473 if (dmi_check_system(entry->system) &&
474 entry->irq == gsi &&
475 entry->triggering == triggering &&
476 entry->polarity == polarity &&
477 entry->shareable == shareable)
478 return entry->override;
479 }
480
481 #ifdef CONFIG_X86
482 /*
483 * IRQ override isn't needed on modern AMD Zen systems and
484 * this override breaks active low IRQs on AMD Ryzen 6000 and
485 * newer systems. Skip it.
486 */
487 if (boot_cpu_has(X86_FEATURE_ZEN))
488 return false;
489 #endif
490
491 return true;
492 }
493
acpi_dev_get_irqresource(struct resource * res,u32 gsi,u8 triggering,u8 polarity,u8 shareable,u8 wake_capable,bool check_override)494 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
495 u8 triggering, u8 polarity, u8 shareable,
496 u8 wake_capable, bool check_override)
497 {
498 int irq, p, t;
499
500 if (!valid_IRQ(gsi)) {
501 irqresource_disabled(res, gsi);
502 return;
503 }
504
505 /*
506 * In IO-APIC mode, use overridden attribute. Two reasons:
507 * 1. BIOS bug in DSDT
508 * 2. BIOS uses IO-APIC mode Interrupt Source Override
509 *
510 * We do this only if we are dealing with IRQ() or IRQNoFlags()
511 * resource (the legacy ISA resources). With modern ACPI 5 devices
512 * using extended IRQ descriptors we take the IRQ configuration
513 * from _CRS directly.
514 */
515 if (check_override &&
516 acpi_dev_irq_override(gsi, triggering, polarity, shareable) &&
517 !acpi_get_override_irq(gsi, &t, &p)) {
518 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
519 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
520
521 if (triggering != trig || polarity != pol) {
522 pr_warn("ACPI: IRQ %d override to %s%s, %s%s\n", gsi,
523 t ? "level" : "edge",
524 trig == triggering ? "" : "(!)",
525 p ? "low" : "high",
526 pol == polarity ? "" : "(!)");
527 triggering = trig;
528 polarity = pol;
529 }
530 }
531
532 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
533 irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
534 if (irq >= 0) {
535 res->start = irq;
536 res->end = irq;
537 } else {
538 irqresource_disabled(res, gsi);
539 }
540 }
541
542 /**
543 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
544 * @ares: Input ACPI resource object.
545 * @index: Index into the array of GSIs represented by the resource.
546 * @res: Output generic resource object.
547 *
548 * Check if the given ACPI resource object represents an interrupt resource
549 * and @index does not exceed the resource's interrupt count (true is returned
550 * in that case regardless of the results of the other checks)). If that's the
551 * case, register the GSI corresponding to @index from the array of interrupts
552 * represented by the resource and populate the generic resource object pointed
553 * to by @res accordingly. If the registration of the GSI is not successful,
554 * IORESOURCE_DISABLED will be set it that object's flags.
555 *
556 * Return:
557 * 1) false with res->flags setting to zero: not the expected resource type
558 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
559 * 3) true: valid assigned resource
560 */
acpi_dev_resource_interrupt(struct acpi_resource * ares,int index,struct resource * res)561 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
562 struct resource *res)
563 {
564 struct acpi_resource_irq *irq;
565 struct acpi_resource_extended_irq *ext_irq;
566
567 switch (ares->type) {
568 case ACPI_RESOURCE_TYPE_IRQ:
569 /*
570 * Per spec, only one interrupt per descriptor is allowed in
571 * _CRS, but some firmware violates this, so parse them all.
572 */
573 irq = &ares->data.irq;
574 if (index >= irq->interrupt_count) {
575 irqresource_disabled(res, 0);
576 return false;
577 }
578 acpi_dev_get_irqresource(res, irq->interrupts[index],
579 irq->triggering, irq->polarity,
580 irq->shareable, irq->wake_capable,
581 true);
582 break;
583 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
584 ext_irq = &ares->data.extended_irq;
585 if (index >= ext_irq->interrupt_count) {
586 irqresource_disabled(res, 0);
587 return false;
588 }
589 if (is_gsi(ext_irq))
590 acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
591 ext_irq->triggering, ext_irq->polarity,
592 ext_irq->shareable, ext_irq->wake_capable,
593 false);
594 else
595 irqresource_disabled(res, 0);
596 break;
597 default:
598 res->flags = 0;
599 return false;
600 }
601
602 return true;
603 }
604 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
605
606 /**
607 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
608 * @list: The head of the resource list to free.
609 */
acpi_dev_free_resource_list(struct list_head * list)610 void acpi_dev_free_resource_list(struct list_head *list)
611 {
612 resource_list_free(list);
613 }
614 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
615
616 struct res_proc_context {
617 struct list_head *list;
618 int (*preproc)(struct acpi_resource *, void *);
619 void *preproc_data;
620 int count;
621 int error;
622 };
623
acpi_dev_new_resource_entry(struct resource_win * win,struct res_proc_context * c)624 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
625 struct res_proc_context *c)
626 {
627 struct resource_entry *rentry;
628
629 rentry = resource_list_create_entry(NULL, 0);
630 if (!rentry) {
631 c->error = -ENOMEM;
632 return AE_NO_MEMORY;
633 }
634 *rentry->res = win->res;
635 rentry->offset = win->offset;
636 resource_list_add_tail(rentry, c->list);
637 c->count++;
638 return AE_OK;
639 }
640
acpi_dev_process_resource(struct acpi_resource * ares,void * context)641 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
642 void *context)
643 {
644 struct res_proc_context *c = context;
645 struct resource_win win;
646 struct resource *res = &win.res;
647 int i;
648
649 if (c->preproc) {
650 int ret;
651
652 ret = c->preproc(ares, c->preproc_data);
653 if (ret < 0) {
654 c->error = ret;
655 return AE_ABORT_METHOD;
656 } else if (ret > 0) {
657 return AE_OK;
658 }
659 }
660
661 memset(&win, 0, sizeof(win));
662
663 if (acpi_dev_resource_memory(ares, res)
664 || acpi_dev_resource_io(ares, res)
665 || acpi_dev_resource_address_space(ares, &win)
666 || acpi_dev_resource_ext_address_space(ares, &win))
667 return acpi_dev_new_resource_entry(&win, c);
668
669 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
670 acpi_status status;
671
672 status = acpi_dev_new_resource_entry(&win, c);
673 if (ACPI_FAILURE(status))
674 return status;
675 }
676
677 return AE_OK;
678 }
679
__acpi_dev_get_resources(struct acpi_device * adev,struct list_head * list,int (* preproc)(struct acpi_resource *,void *),void * preproc_data,char * method)680 static int __acpi_dev_get_resources(struct acpi_device *adev,
681 struct list_head *list,
682 int (*preproc)(struct acpi_resource *, void *),
683 void *preproc_data, char *method)
684 {
685 struct res_proc_context c;
686 acpi_status status;
687
688 if (!adev || !adev->handle || !list_empty(list))
689 return -EINVAL;
690
691 if (!acpi_has_method(adev->handle, method))
692 return 0;
693
694 c.list = list;
695 c.preproc = preproc;
696 c.preproc_data = preproc_data;
697 c.count = 0;
698 c.error = 0;
699 status = acpi_walk_resources(adev->handle, method,
700 acpi_dev_process_resource, &c);
701 if (ACPI_FAILURE(status)) {
702 acpi_dev_free_resource_list(list);
703 return c.error ? c.error : -EIO;
704 }
705
706 return c.count;
707 }
708
709 /**
710 * acpi_dev_get_resources - Get current resources of a device.
711 * @adev: ACPI device node to get the resources for.
712 * @list: Head of the resultant list of resources (must be empty).
713 * @preproc: The caller's preprocessing routine.
714 * @preproc_data: Pointer passed to the caller's preprocessing routine.
715 *
716 * Evaluate the _CRS method for the given device node and process its output by
717 * (1) executing the @preproc() routine provided by the caller, passing the
718 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
719 * returned and (2) converting all of the returned ACPI resources into struct
720 * resource objects if possible. If the return value of @preproc() in step (1)
721 * is different from 0, step (2) is not applied to the given ACPI resource and
722 * if that value is negative, the whole processing is aborted and that value is
723 * returned as the final error code.
724 *
725 * The resultant struct resource objects are put on the list pointed to by
726 * @list, that must be empty initially, as members of struct resource_entry
727 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
728 * free that list.
729 *
730 * The number of resources in the output list is returned on success, an error
731 * code reflecting the error condition is returned otherwise.
732 */
acpi_dev_get_resources(struct acpi_device * adev,struct list_head * list,int (* preproc)(struct acpi_resource *,void *),void * preproc_data)733 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
734 int (*preproc)(struct acpi_resource *, void *),
735 void *preproc_data)
736 {
737 return __acpi_dev_get_resources(adev, list, preproc, preproc_data,
738 METHOD_NAME__CRS);
739 }
740 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
741
is_memory(struct acpi_resource * ares,void * not_used)742 static int is_memory(struct acpi_resource *ares, void *not_used)
743 {
744 struct resource_win win;
745 struct resource *res = &win.res;
746
747 memset(&win, 0, sizeof(win));
748
749 if (acpi_dev_filter_resource_type(ares, IORESOURCE_MEM))
750 return 1;
751
752 return !(acpi_dev_resource_memory(ares, res)
753 || acpi_dev_resource_address_space(ares, &win)
754 || acpi_dev_resource_ext_address_space(ares, &win));
755 }
756
757 /**
758 * acpi_dev_get_dma_resources - Get current DMA resources of a device.
759 * @adev: ACPI device node to get the resources for.
760 * @list: Head of the resultant list of resources (must be empty).
761 *
762 * Evaluate the _DMA method for the given device node and process its
763 * output.
764 *
765 * The resultant struct resource objects are put on the list pointed to
766 * by @list, that must be empty initially, as members of struct
767 * resource_entry objects. Callers of this routine should use
768 * %acpi_dev_free_resource_list() to free that list.
769 *
770 * The number of resources in the output list is returned on success,
771 * an error code reflecting the error condition is returned otherwise.
772 */
acpi_dev_get_dma_resources(struct acpi_device * adev,struct list_head * list)773 int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
774 {
775 return __acpi_dev_get_resources(adev, list, is_memory, NULL,
776 METHOD_NAME__DMA);
777 }
778 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
779
780 /**
781 * acpi_dev_get_memory_resources - Get current memory resources of a device.
782 * @adev: ACPI device node to get the resources for.
783 * @list: Head of the resultant list of resources (must be empty).
784 *
785 * This is a helper function that locates all memory type resources of @adev
786 * with acpi_dev_get_resources().
787 *
788 * The number of resources in the output list is returned on success, an error
789 * code reflecting the error condition is returned otherwise.
790 */
acpi_dev_get_memory_resources(struct acpi_device * adev,struct list_head * list)791 int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list)
792 {
793 return acpi_dev_get_resources(adev, list, is_memory, NULL);
794 }
795 EXPORT_SYMBOL_GPL(acpi_dev_get_memory_resources);
796
797 /**
798 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
799 * types
800 * @ares: Input ACPI resource object.
801 * @types: Valid resource types of IORESOURCE_XXX
802 *
803 * This is a helper function to support acpi_dev_get_resources(), which filters
804 * ACPI resource objects according to resource types.
805 */
acpi_dev_filter_resource_type(struct acpi_resource * ares,unsigned long types)806 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
807 unsigned long types)
808 {
809 unsigned long type = 0;
810
811 switch (ares->type) {
812 case ACPI_RESOURCE_TYPE_MEMORY24:
813 case ACPI_RESOURCE_TYPE_MEMORY32:
814 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
815 type = IORESOURCE_MEM;
816 break;
817 case ACPI_RESOURCE_TYPE_IO:
818 case ACPI_RESOURCE_TYPE_FIXED_IO:
819 type = IORESOURCE_IO;
820 break;
821 case ACPI_RESOURCE_TYPE_IRQ:
822 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
823 type = IORESOURCE_IRQ;
824 break;
825 case ACPI_RESOURCE_TYPE_DMA:
826 case ACPI_RESOURCE_TYPE_FIXED_DMA:
827 type = IORESOURCE_DMA;
828 break;
829 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
830 type = IORESOURCE_REG;
831 break;
832 case ACPI_RESOURCE_TYPE_ADDRESS16:
833 case ACPI_RESOURCE_TYPE_ADDRESS32:
834 case ACPI_RESOURCE_TYPE_ADDRESS64:
835 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
836 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
837 type = IORESOURCE_MEM;
838 else if (ares->data.address.resource_type == ACPI_IO_RANGE)
839 type = IORESOURCE_IO;
840 else if (ares->data.address.resource_type ==
841 ACPI_BUS_NUMBER_RANGE)
842 type = IORESOURCE_BUS;
843 break;
844 default:
845 break;
846 }
847
848 return (type & types) ? 0 : 1;
849 }
850 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
851
acpi_dev_consumes_res(struct acpi_device * adev,struct resource * res)852 static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res)
853 {
854 struct list_head resource_list;
855 struct resource_entry *rentry;
856 int ret, found = 0;
857
858 INIT_LIST_HEAD(&resource_list);
859 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
860 if (ret < 0)
861 return 0;
862
863 list_for_each_entry(rentry, &resource_list, node) {
864 if (resource_contains(rentry->res, res)) {
865 found = 1;
866 break;
867 }
868
869 }
870
871 acpi_dev_free_resource_list(&resource_list);
872 return found;
873 }
874
acpi_res_consumer_cb(acpi_handle handle,u32 depth,void * context,void ** ret)875 static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
876 void *context, void **ret)
877 {
878 struct resource *res = context;
879 struct acpi_device **consumer = (struct acpi_device **) ret;
880 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
881
882 if (!adev)
883 return AE_OK;
884
885 if (acpi_dev_consumes_res(adev, res)) {
886 *consumer = adev;
887 return AE_CTRL_TERMINATE;
888 }
889
890 return AE_OK;
891 }
892
893 /**
894 * acpi_resource_consumer - Find the ACPI device that consumes @res.
895 * @res: Resource to search for.
896 *
897 * Search the current resource settings (_CRS) of every ACPI device node
898 * for @res. If we find an ACPI device whose _CRS includes @res, return
899 * it. Otherwise, return NULL.
900 */
acpi_resource_consumer(struct resource * res)901 struct acpi_device *acpi_resource_consumer(struct resource *res)
902 {
903 struct acpi_device *consumer = NULL;
904
905 acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer);
906 return consumer;
907 }
908
