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 .ident = "Asus ExpertBook B2402CBA",
437 .matches = {
438 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
439 DMI_MATCH(DMI_BOARD_NAME, "B2402CBA"),
440 },
441 },
442 {
443 .ident = "Asus ExpertBook B2502",
444 .matches = {
445 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
446 DMI_MATCH(DMI_BOARD_NAME, "B2502CBA"),
447 },
448 },
449 { }
450 };
451
452 static const struct dmi_system_id lenovo_laptop[] = {
453 {
454 .ident = "LENOVO IdeaPad Flex 5 14ALC7",
455 .matches = {
456 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
457 DMI_MATCH(DMI_PRODUCT_NAME, "82R9"),
458 },
459 },
460 {
461 .ident = "LENOVO IdeaPad Flex 5 16ALC7",
462 .matches = {
463 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
464 DMI_MATCH(DMI_PRODUCT_NAME, "82RA"),
465 },
466 },
467 { }
468 };
469
470 static const struct dmi_system_id schenker_gm_rg[] = {
471 {
472 .ident = "XMG CORE 15 (M22)",
473 .matches = {
474 DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
475 DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"),
476 },
477 },
478 { }
479 };
480
481 struct irq_override_cmp {
482 const struct dmi_system_id *system;
483 unsigned char irq;
484 unsigned char triggering;
485 unsigned char polarity;
486 unsigned char shareable;
487 bool override;
488 };
489
490 static const struct irq_override_cmp override_table[] = {
491 { medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
492 { asus_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
493 { lenovo_laptop, 6, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
494 { lenovo_laptop, 10, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
495 { schenker_gm_rg, 1, ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_LOW, 1, true },
496 };
497
acpi_dev_irq_override(u32 gsi,u8 triggering,u8 polarity,u8 shareable)498 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
499 u8 shareable)
500 {
501 int i;
502
503 for (i = 0; i < ARRAY_SIZE(override_table); i++) {
504 const struct irq_override_cmp *entry = &override_table[i];
505
506 if (dmi_check_system(entry->system) &&
507 entry->irq == gsi &&
508 entry->triggering == triggering &&
509 entry->polarity == polarity &&
510 entry->shareable == shareable)
511 return entry->override;
512 }
513
514 #ifdef CONFIG_X86
515 /*
516 * IRQ override isn't needed on modern AMD Zen systems and
517 * this override breaks active low IRQs on AMD Ryzen 6000 and
518 * newer systems. Skip it.
519 */
520 if (boot_cpu_has(X86_FEATURE_ZEN))
521 return false;
522 #endif
523
524 return true;
525 }
526
acpi_dev_get_irqresource(struct resource * res,u32 gsi,u8 triggering,u8 polarity,u8 shareable,u8 wake_capable,bool check_override)527 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
528 u8 triggering, u8 polarity, u8 shareable,
529 u8 wake_capable, bool check_override)
530 {
531 int irq, p, t;
532
533 if (!valid_IRQ(gsi)) {
534 irqresource_disabled(res, gsi);
535 return;
536 }
537
538 /*
539 * In IO-APIC mode, use overridden attribute. Two reasons:
540 * 1. BIOS bug in DSDT
541 * 2. BIOS uses IO-APIC mode Interrupt Source Override
542 *
543 * We do this only if we are dealing with IRQ() or IRQNoFlags()
544 * resource (the legacy ISA resources). With modern ACPI 5 devices
545 * using extended IRQ descriptors we take the IRQ configuration
546 * from _CRS directly.
547 */
548 if (check_override &&
549 acpi_dev_irq_override(gsi, triggering, polarity, shareable) &&
550 !acpi_get_override_irq(gsi, &t, &p)) {
551 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
552 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
553
554 if (triggering != trig || polarity != pol) {
555 pr_warn("ACPI: IRQ %d override to %s%s, %s%s\n", gsi,
556 t ? "level" : "edge",
557 trig == triggering ? "" : "(!)",
558 p ? "low" : "high",
559 pol == polarity ? "" : "(!)");
560 triggering = trig;
561 polarity = pol;
562 }
563 }
564
565 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
566 irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
567 if (irq >= 0) {
568 res->start = irq;
569 res->end = irq;
570 } else {
571 irqresource_disabled(res, gsi);
572 }
573 }
574
575 /**
576 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
577 * @ares: Input ACPI resource object.
578 * @index: Index into the array of GSIs represented by the resource.
579 * @res: Output generic resource object.
580 *
581 * Check if the given ACPI resource object represents an interrupt resource
582 * and @index does not exceed the resource's interrupt count (true is returned
583 * in that case regardless of the results of the other checks)). If that's the
584 * case, register the GSI corresponding to @index from the array of interrupts
585 * represented by the resource and populate the generic resource object pointed
586 * to by @res accordingly. If the registration of the GSI is not successful,
587 * IORESOURCE_DISABLED will be set it that object's flags.
588 *
589 * Return:
590 * 1) false with res->flags setting to zero: not the expected resource type
591 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
592 * 3) true: valid assigned resource
593 */
acpi_dev_resource_interrupt(struct acpi_resource * ares,int index,struct resource * res)594 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
595 struct resource *res)
596 {
597 struct acpi_resource_irq *irq;
598 struct acpi_resource_extended_irq *ext_irq;
599
600 switch (ares->type) {
601 case ACPI_RESOURCE_TYPE_IRQ:
602 /*
603 * Per spec, only one interrupt per descriptor is allowed in
604 * _CRS, but some firmware violates this, so parse them all.
605 */
606 irq = &ares->data.irq;
607 if (index >= irq->interrupt_count) {
608 irqresource_disabled(res, 0);
609 return false;
610 }
611 acpi_dev_get_irqresource(res, irq->interrupts[index],
612 irq->triggering, irq->polarity,
613 irq->shareable, irq->wake_capable,
614 true);
615 break;
616 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
617 ext_irq = &ares->data.extended_irq;
618 if (index >= ext_irq->interrupt_count) {
619 irqresource_disabled(res, 0);
620 return false;
621 }
622 if (is_gsi(ext_irq))
623 acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
624 ext_irq->triggering, ext_irq->polarity,
625 ext_irq->shareable, ext_irq->wake_capable,
626 false);
627 else
628 irqresource_disabled(res, 0);
629 break;
630 default:
631 res->flags = 0;
632 return false;
633 }
634
635 return true;
636 }
637 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
638
639 /**
640 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
641 * @list: The head of the resource list to free.
642 */
acpi_dev_free_resource_list(struct list_head * list)643 void acpi_dev_free_resource_list(struct list_head *list)
644 {
645 resource_list_free(list);
646 }
647 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
648
649 struct res_proc_context {
650 struct list_head *list;
651 int (*preproc)(struct acpi_resource *, void *);
652 void *preproc_data;
653 int count;
654 int error;
655 };
656
acpi_dev_new_resource_entry(struct resource_win * win,struct res_proc_context * c)657 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
658 struct res_proc_context *c)
659 {
660 struct resource_entry *rentry;
661
662 rentry = resource_list_create_entry(NULL, 0);
663 if (!rentry) {
664 c->error = -ENOMEM;
665 return AE_NO_MEMORY;
666 }
667 *rentry->res = win->res;
668 rentry->offset = win->offset;
669 resource_list_add_tail(rentry, c->list);
670 c->count++;
671 return AE_OK;
672 }
673
acpi_dev_process_resource(struct acpi_resource * ares,void * context)674 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
675 void *context)
676 {
677 struct res_proc_context *c = context;
678 struct resource_win win;
679 struct resource *res = &win.res;
680 int i;
681
682 if (c->preproc) {
683 int ret;
684
685 ret = c->preproc(ares, c->preproc_data);
686 if (ret < 0) {
687 c->error = ret;
688 return AE_ABORT_METHOD;
689 } else if (ret > 0) {
690 return AE_OK;
691 }
692 }
693
694 memset(&win, 0, sizeof(win));
695
696 if (acpi_dev_resource_memory(ares, res)
697 || acpi_dev_resource_io(ares, res)
698 || acpi_dev_resource_address_space(ares, &win)
699 || acpi_dev_resource_ext_address_space(ares, &win))
700 return acpi_dev_new_resource_entry(&win, c);
701
702 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
703 acpi_status status;
704
705 status = acpi_dev_new_resource_entry(&win, c);
706 if (ACPI_FAILURE(status))
707 return status;
708 }
709
710 return AE_OK;
711 }
712
__acpi_dev_get_resources(struct acpi_device * adev,struct list_head * list,int (* preproc)(struct acpi_resource *,void *),void * preproc_data,char * method)713 static int __acpi_dev_get_resources(struct acpi_device *adev,
714 struct list_head *list,
715 int (*preproc)(struct acpi_resource *, void *),
716 void *preproc_data, char *method)
717 {
718 struct res_proc_context c;
719 acpi_status status;
720
721 if (!adev || !adev->handle || !list_empty(list))
722 return -EINVAL;
723
724 if (!acpi_has_method(adev->handle, method))
725 return 0;
726
727 c.list = list;
728 c.preproc = preproc;
729 c.preproc_data = preproc_data;
730 c.count = 0;
731 c.error = 0;
732 status = acpi_walk_resources(adev->handle, method,
733 acpi_dev_process_resource, &c);
734 if (ACPI_FAILURE(status)) {
735 acpi_dev_free_resource_list(list);
736 return c.error ? c.error : -EIO;
737 }
738
739 return c.count;
740 }
741
742 /**
743 * acpi_dev_get_resources - Get current resources of a device.
744 * @adev: ACPI device node to get the resources for.
745 * @list: Head of the resultant list of resources (must be empty).
746 * @preproc: The caller's preprocessing routine.
747 * @preproc_data: Pointer passed to the caller's preprocessing routine.
748 *
749 * Evaluate the _CRS method for the given device node and process its output by
750 * (1) executing the @preproc() routine provided by the caller, passing the
751 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
752 * returned and (2) converting all of the returned ACPI resources into struct
753 * resource objects if possible. If the return value of @preproc() in step (1)
754 * is different from 0, step (2) is not applied to the given ACPI resource and
755 * if that value is negative, the whole processing is aborted and that value is
756 * returned as the final error code.
757 *
758 * The resultant struct resource objects are put on the list pointed to by
759 * @list, that must be empty initially, as members of struct resource_entry
760 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
761 * free that list.
762 *
763 * The number of resources in the output list is returned on success, an error
764 * code reflecting the error condition is returned otherwise.
765 */
acpi_dev_get_resources(struct acpi_device * adev,struct list_head * list,int (* preproc)(struct acpi_resource *,void *),void * preproc_data)766 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
767 int (*preproc)(struct acpi_resource *, void *),
768 void *preproc_data)
769 {
770 return __acpi_dev_get_resources(adev, list, preproc, preproc_data,
771 METHOD_NAME__CRS);
772 }
773 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
774
is_memory(struct acpi_resource * ares,void * not_used)775 static int is_memory(struct acpi_resource *ares, void *not_used)
776 {
777 struct resource_win win;
778 struct resource *res = &win.res;
779
780 memset(&win, 0, sizeof(win));
781
782 if (acpi_dev_filter_resource_type(ares, IORESOURCE_MEM))
783 return 1;
784
785 return !(acpi_dev_resource_memory(ares, res)
786 || acpi_dev_resource_address_space(ares, &win)
787 || acpi_dev_resource_ext_address_space(ares, &win));
788 }
789
790 /**
791 * acpi_dev_get_dma_resources - Get current DMA resources of a device.
792 * @adev: ACPI device node to get the resources for.
793 * @list: Head of the resultant list of resources (must be empty).
794 *
795 * Evaluate the _DMA method for the given device node and process its
796 * output.
797 *
798 * The resultant struct resource objects are put on the list pointed to
799 * by @list, that must be empty initially, as members of struct
800 * resource_entry objects. Callers of this routine should use
801 * %acpi_dev_free_resource_list() to free that list.
802 *
803 * The number of resources in the output list is returned on success,
804 * an error code reflecting the error condition is returned otherwise.
805 */
acpi_dev_get_dma_resources(struct acpi_device * adev,struct list_head * list)806 int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
807 {
808 return __acpi_dev_get_resources(adev, list, is_memory, NULL,
809 METHOD_NAME__DMA);
810 }
811 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
812
813 /**
814 * acpi_dev_get_memory_resources - Get current memory resources of a device.
815 * @adev: ACPI device node to get the resources for.
816 * @list: Head of the resultant list of resources (must be empty).
817 *
818 * This is a helper function that locates all memory type resources of @adev
819 * with acpi_dev_get_resources().
820 *
821 * The number of resources in the output list is returned on success, an error
822 * code reflecting the error condition is returned otherwise.
823 */
acpi_dev_get_memory_resources(struct acpi_device * adev,struct list_head * list)824 int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list)
825 {
826 return acpi_dev_get_resources(adev, list, is_memory, NULL);
827 }
828 EXPORT_SYMBOL_GPL(acpi_dev_get_memory_resources);
829
830 /**
831 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
832 * types
833 * @ares: Input ACPI resource object.
834 * @types: Valid resource types of IORESOURCE_XXX
835 *
836 * This is a helper function to support acpi_dev_get_resources(), which filters
837 * ACPI resource objects according to resource types.
838 */
acpi_dev_filter_resource_type(struct acpi_resource * ares,unsigned long types)839 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
840 unsigned long types)
841 {
842 unsigned long type = 0;
843
844 switch (ares->type) {
845 case ACPI_RESOURCE_TYPE_MEMORY24:
846 case ACPI_RESOURCE_TYPE_MEMORY32:
847 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
848 type = IORESOURCE_MEM;
849 break;
850 case ACPI_RESOURCE_TYPE_IO:
851 case ACPI_RESOURCE_TYPE_FIXED_IO:
852 type = IORESOURCE_IO;
853 break;
854 case ACPI_RESOURCE_TYPE_IRQ:
855 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
856 type = IORESOURCE_IRQ;
857 break;
858 case ACPI_RESOURCE_TYPE_DMA:
859 case ACPI_RESOURCE_TYPE_FIXED_DMA:
860 type = IORESOURCE_DMA;
861 break;
862 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
863 type = IORESOURCE_REG;
864 break;
865 case ACPI_RESOURCE_TYPE_ADDRESS16:
866 case ACPI_RESOURCE_TYPE_ADDRESS32:
867 case ACPI_RESOURCE_TYPE_ADDRESS64:
868 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
869 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
870 type = IORESOURCE_MEM;
871 else if (ares->data.address.resource_type == ACPI_IO_RANGE)
872 type = IORESOURCE_IO;
873 else if (ares->data.address.resource_type ==
874 ACPI_BUS_NUMBER_RANGE)
875 type = IORESOURCE_BUS;
876 break;
877 default:
878 break;
879 }
880
881 return (type & types) ? 0 : 1;
882 }
883 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
884
acpi_dev_consumes_res(struct acpi_device * adev,struct resource * res)885 static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res)
886 {
887 struct list_head resource_list;
888 struct resource_entry *rentry;
889 int ret, found = 0;
890
891 INIT_LIST_HEAD(&resource_list);
892 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
893 if (ret < 0)
894 return 0;
895
896 list_for_each_entry(rentry, &resource_list, node) {
897 if (resource_contains(rentry->res, res)) {
898 found = 1;
899 break;
900 }
901
902 }
903
904 acpi_dev_free_resource_list(&resource_list);
905 return found;
906 }
907
acpi_res_consumer_cb(acpi_handle handle,u32 depth,void * context,void ** ret)908 static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
909 void *context, void **ret)
910 {
911 struct resource *res = context;
912 struct acpi_device **consumer = (struct acpi_device **) ret;
913 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
914
915 if (!adev)
916 return AE_OK;
917
918 if (acpi_dev_consumes_res(adev, res)) {
919 *consumer = adev;
920 return AE_CTRL_TERMINATE;
921 }
922
923 return AE_OK;
924 }
925
926 /**
927 * acpi_resource_consumer - Find the ACPI device that consumes @res.
928 * @res: Resource to search for.
929 *
930 * Search the current resource settings (_CRS) of every ACPI device node
931 * for @res. If we find an ACPI device whose _CRS includes @res, return
932 * it. Otherwise, return NULL.
933 */
acpi_resource_consumer(struct resource * res)934 struct acpi_device *acpi_resource_consumer(struct resource *res)
935 {
936 struct acpi_device *consumer = NULL;
937
938 acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer);
939 return consumer;
940 }
941