1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/acpi/resource.c - ACPI device resources interpretation. 4 * 5 * Copyright (C) 2012, Intel Corp. 6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 */ 12 13 #include <linux/acpi.h> 14 #include <linux/device.h> 15 #include <linux/export.h> 16 #include <linux/ioport.h> 17 #include <linux/slab.h> 18 #include <linux/irq.h> 19 #include <linux/dmi.h> 20 21 #ifdef CONFIG_X86 22 #define valid_IRQ(i) (((i) != 0) && ((i) != 2)) 23 static inline bool acpi_iospace_resource_valid(struct resource *res) 24 { 25 /* On X86 IO space is limited to the [0 - 64K] IO port range */ 26 return res->end < 0x10003; 27 } 28 #else 29 #define valid_IRQ(i) (true) 30 /* 31 * ACPI IO descriptors on arches other than X86 contain MMIO CPU physical 32 * addresses mapping IO space in CPU physical address space, IO space 33 * resources can be placed anywhere in the 64-bit physical address space. 34 */ 35 static inline bool 36 acpi_iospace_resource_valid(struct resource *res) { return true; } 37 #endif 38 39 #if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI) 40 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq) 41 { 42 return ext_irq->resource_source.string_length == 0 && 43 ext_irq->producer_consumer == ACPI_CONSUMER; 44 } 45 #else 46 static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq) 47 { 48 return true; 49 } 50 #endif 51 52 static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io) 53 { 54 u64 reslen = end - start + 1; 55 56 /* 57 * CHECKME: len might be required to check versus a minimum 58 * length as well. 1 for io is fine, but for memory it does 59 * not make any sense at all. 60 * Note: some BIOSes report incorrect length for ACPI address space 61 * descriptor, so remove check of 'reslen == len' to avoid regression. 62 */ 63 if (len && reslen && start <= end) 64 return true; 65 66 pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n", 67 io ? "io" : "mem", start, end, len); 68 69 return false; 70 } 71 72 static void acpi_dev_memresource_flags(struct resource *res, u64 len, 73 u8 write_protect) 74 { 75 res->flags = IORESOURCE_MEM; 76 77 if (!acpi_dev_resource_len_valid(res->start, res->end, len, false)) 78 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET; 79 80 if (write_protect == ACPI_READ_WRITE_MEMORY) 81 res->flags |= IORESOURCE_MEM_WRITEABLE; 82 } 83 84 static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len, 85 u8 write_protect) 86 { 87 res->start = start; 88 res->end = start + len - 1; 89 acpi_dev_memresource_flags(res, len, write_protect); 90 } 91 92 /** 93 * acpi_dev_resource_memory - Extract ACPI memory resource information. 94 * @ares: Input ACPI resource object. 95 * @res: Output generic resource object. 96 * 97 * Check if the given ACPI resource object represents a memory resource and 98 * if that's the case, use the information in it to populate the generic 99 * resource object pointed to by @res. 100 * 101 * Return: 102 * 1) false with res->flags setting to zero: not the expected resource type 103 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource 104 * 3) true: valid assigned resource 105 */ 106 bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res) 107 { 108 struct acpi_resource_memory24 *memory24; 109 struct acpi_resource_memory32 *memory32; 110 struct acpi_resource_fixed_memory32 *fixed_memory32; 111 112 switch (ares->type) { 113 case ACPI_RESOURCE_TYPE_MEMORY24: 114 memory24 = &ares->data.memory24; 115 acpi_dev_get_memresource(res, memory24->minimum << 8, 116 memory24->address_length << 8, 117 memory24->write_protect); 118 break; 119 case ACPI_RESOURCE_TYPE_MEMORY32: 120 memory32 = &ares->data.memory32; 121 acpi_dev_get_memresource(res, memory32->minimum, 122 memory32->address_length, 123 memory32->write_protect); 124 break; 125 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: 126 fixed_memory32 = &ares->data.fixed_memory32; 127 acpi_dev_get_memresource(res, fixed_memory32->address, 128 fixed_memory32->address_length, 129 fixed_memory32->write_protect); 130 break; 131 default: 132 res->flags = 0; 133 return false; 134 } 135 136 return !(res->flags & IORESOURCE_DISABLED); 137 } 138 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory); 139 140 static void acpi_dev_ioresource_flags(struct resource *res, u64 len, 141 u8 io_decode, u8 translation_type) 142 { 143 res->flags = IORESOURCE_IO; 144 145 if (!acpi_dev_resource_len_valid(res->start, res->end, len, true)) 146 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET; 147 148 if (!acpi_iospace_resource_valid(res)) 149 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET; 150 151 if (io_decode == ACPI_DECODE_16) 152 res->flags |= IORESOURCE_IO_16BIT_ADDR; 153 if (translation_type == ACPI_SPARSE_TRANSLATION) 154 res->flags |= IORESOURCE_IO_SPARSE; 155 } 156 157 static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len, 158 u8 io_decode) 159 { 160 res->start = start; 161 res->end = start + len - 1; 162 acpi_dev_ioresource_flags(res, len, io_decode, 0); 163 } 164 165 /** 166 * acpi_dev_resource_io - Extract ACPI I/O resource information. 167 * @ares: Input ACPI resource object. 168 * @res: Output generic resource object. 169 * 170 * Check if the given ACPI resource object represents an I/O resource and 171 * if that's the case, use the information in it to populate the generic 172 * resource object pointed to by @res. 173 * 174 * Return: 175 * 1) false with res->flags setting to zero: not the expected resource type 176 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource 177 * 3) true: valid assigned resource 178 */ 179 bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res) 180 { 181 struct acpi_resource_io *io; 182 struct acpi_resource_fixed_io *fixed_io; 183 184 switch (ares->type) { 185 case ACPI_RESOURCE_TYPE_IO: 186 io = &ares->data.io; 187 acpi_dev_get_ioresource(res, io->minimum, 188 io->address_length, 189 io->io_decode); 190 break; 191 case ACPI_RESOURCE_TYPE_FIXED_IO: 192 fixed_io = &ares->data.fixed_io; 193 acpi_dev_get_ioresource(res, fixed_io->address, 194 fixed_io->address_length, 195 ACPI_DECODE_10); 196 break; 197 default: 198 res->flags = 0; 199 return false; 200 } 201 202 return !(res->flags & IORESOURCE_DISABLED); 203 } 204 EXPORT_SYMBOL_GPL(acpi_dev_resource_io); 205 206 static bool acpi_decode_space(struct resource_win *win, 207 struct acpi_resource_address *addr, 208 struct acpi_address64_attribute *attr) 209 { 210 u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16; 211 bool wp = addr->info.mem.write_protect; 212 u64 len = attr->address_length; 213 u64 start, end, offset = 0; 214 struct resource *res = &win->res; 215 216 /* 217 * Filter out invalid descriptor according to ACPI Spec 5.0, section 218 * 6.4.3.5 Address Space Resource Descriptors. 219 */ 220 if ((addr->min_address_fixed != addr->max_address_fixed && len) || 221 (addr->min_address_fixed && addr->max_address_fixed && !len)) 222 pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n", 223 addr->min_address_fixed, addr->max_address_fixed, len); 224 225 /* 226 * For bridges that translate addresses across the bridge, 227 * translation_offset is the offset that must be added to the 228 * address on the secondary side to obtain the address on the 229 * primary side. Non-bridge devices must list 0 for all Address 230 * Translation offset bits. 231 */ 232 if (addr->producer_consumer == ACPI_PRODUCER) 233 offset = attr->translation_offset; 234 else if (attr->translation_offset) 235 pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n", 236 attr->translation_offset); 237 start = attr->minimum + offset; 238 end = attr->maximum + offset; 239 240 win->offset = offset; 241 res->start = start; 242 res->end = end; 243 if (sizeof(resource_size_t) < sizeof(u64) && 244 (offset != win->offset || start != res->start || end != res->end)) { 245 pr_warn("acpi resource window ([%#llx-%#llx] ignored, not CPU addressable)\n", 246 attr->minimum, attr->maximum); 247 return false; 248 } 249 250 switch (addr->resource_type) { 251 case ACPI_MEMORY_RANGE: 252 acpi_dev_memresource_flags(res, len, wp); 253 break; 254 case ACPI_IO_RANGE: 255 acpi_dev_ioresource_flags(res, len, iodec, 256 addr->info.io.translation_type); 257 break; 258 case ACPI_BUS_NUMBER_RANGE: 259 res->flags = IORESOURCE_BUS; 260 break; 261 default: 262 return false; 263 } 264 265 if (addr->producer_consumer == ACPI_PRODUCER) 266 res->flags |= IORESOURCE_WINDOW; 267 268 if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY) 269 res->flags |= IORESOURCE_PREFETCH; 270 271 return !(res->flags & IORESOURCE_DISABLED); 272 } 273 274 /** 275 * acpi_dev_resource_address_space - Extract ACPI address space information. 276 * @ares: Input ACPI resource object. 277 * @win: Output generic resource object. 278 * 279 * Check if the given ACPI resource object represents an address space resource 280 * and if that's the case, use the information in it to populate the generic 281 * resource object pointed to by @win. 282 * 283 * Return: 284 * 1) false with win->res.flags setting to zero: not the expected resource type 285 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned 286 * resource 287 * 3) true: valid assigned resource 288 */ 289 bool acpi_dev_resource_address_space(struct acpi_resource *ares, 290 struct resource_win *win) 291 { 292 struct acpi_resource_address64 addr; 293 294 win->res.flags = 0; 295 if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr))) 296 return false; 297 298 return acpi_decode_space(win, (struct acpi_resource_address *)&addr, 299 &addr.address); 300 } 301 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space); 302 303 /** 304 * acpi_dev_resource_ext_address_space - Extract ACPI address space information. 305 * @ares: Input ACPI resource object. 306 * @win: Output generic resource object. 307 * 308 * Check if the given ACPI resource object represents an extended address space 309 * resource and if that's the case, use the information in it to populate the 310 * generic resource object pointed to by @win. 311 * 312 * Return: 313 * 1) false with win->res.flags setting to zero: not the expected resource type 314 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned 315 * resource 316 * 3) true: valid assigned resource 317 */ 318 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares, 319 struct resource_win *win) 320 { 321 struct acpi_resource_extended_address64 *ext_addr; 322 323 win->res.flags = 0; 324 if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64) 325 return false; 326 327 ext_addr = &ares->data.ext_address64; 328 329 return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr, 330 &ext_addr->address); 331 } 332 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space); 333 334 /** 335 * acpi_dev_irq_flags - Determine IRQ resource flags. 336 * @triggering: Triggering type as provided by ACPI. 337 * @polarity: Interrupt polarity as provided by ACPI. 338 * @shareable: Whether or not the interrupt is shareable. 339 */ 340 unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable) 341 { 342 unsigned long flags; 343 344 if (triggering == ACPI_LEVEL_SENSITIVE) 345 flags = polarity == ACPI_ACTIVE_LOW ? 346 IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL; 347 else 348 flags = polarity == ACPI_ACTIVE_LOW ? 349 IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE; 350 351 if (shareable == ACPI_SHARED) 352 flags |= IORESOURCE_IRQ_SHAREABLE; 353 354 return flags | IORESOURCE_IRQ; 355 } 356 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags); 357 358 /** 359 * acpi_dev_get_irq_type - Determine irq type. 360 * @triggering: Triggering type as provided by ACPI. 361 * @polarity: Interrupt polarity as provided by ACPI. 362 */ 363 unsigned int acpi_dev_get_irq_type(int triggering, int polarity) 364 { 365 switch (polarity) { 366 case ACPI_ACTIVE_LOW: 367 return triggering == ACPI_EDGE_SENSITIVE ? 368 IRQ_TYPE_EDGE_FALLING : 369 IRQ_TYPE_LEVEL_LOW; 370 case ACPI_ACTIVE_HIGH: 371 return triggering == ACPI_EDGE_SENSITIVE ? 372 IRQ_TYPE_EDGE_RISING : 373 IRQ_TYPE_LEVEL_HIGH; 374 case ACPI_ACTIVE_BOTH: 375 if (triggering == ACPI_EDGE_SENSITIVE) 376 return IRQ_TYPE_EDGE_BOTH; 377 fallthrough; 378 default: 379 return IRQ_TYPE_NONE; 380 } 381 } 382 EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type); 383 384 static const struct dmi_system_id medion_laptop[] = { 385 { 386 .ident = "MEDION P15651", 387 .matches = { 388 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"), 389 DMI_MATCH(DMI_BOARD_NAME, "M15T"), 390 }, 391 }, 392 { 393 .ident = "MEDION S17405", 394 .matches = { 395 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"), 396 DMI_MATCH(DMI_BOARD_NAME, "M17T"), 397 }, 398 }, 399 { } 400 }; 401 402 struct irq_override_cmp { 403 const struct dmi_system_id *system; 404 unsigned char irq; 405 unsigned char triggering; 406 unsigned char polarity; 407 unsigned char shareable; 408 }; 409 410 static const struct irq_override_cmp skip_override_table[] = { 411 { medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0 }, 412 }; 413 414 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity, 415 u8 shareable) 416 { 417 int i; 418 419 for (i = 0; i < ARRAY_SIZE(skip_override_table); i++) { 420 const struct irq_override_cmp *entry = &skip_override_table[i]; 421 422 if (dmi_check_system(entry->system) && 423 entry->irq == gsi && 424 entry->triggering == triggering && 425 entry->polarity == polarity && 426 entry->shareable == shareable) 427 return false; 428 } 429 430 return true; 431 } 432 433 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, 434 u8 triggering, u8 polarity, u8 shareable, 435 bool check_override) 436 { 437 int irq, p, t; 438 439 if (!valid_IRQ(gsi)) { 440 irqresource_disabled(res, gsi); 441 return; 442 } 443 444 /* 445 * In IO-APIC mode, use overridden attribute. Two reasons: 446 * 1. BIOS bug in DSDT 447 * 2. BIOS uses IO-APIC mode Interrupt Source Override 448 * 449 * We do this only if we are dealing with IRQ() or IRQNoFlags() 450 * resource (the legacy ISA resources). With modern ACPI 5 devices 451 * using extended IRQ descriptors we take the IRQ configuration 452 * from _CRS directly. 453 */ 454 if (check_override && 455 acpi_dev_irq_override(gsi, triggering, polarity, shareable) && 456 !acpi_get_override_irq(gsi, &t, &p)) { 457 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; 458 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; 459 460 if (triggering != trig || polarity != pol) { 461 pr_warn("ACPI: IRQ %d override to %s, %s\n", gsi, 462 t ? "level" : "edge", p ? "low" : "high"); 463 triggering = trig; 464 polarity = pol; 465 } 466 } 467 468 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable); 469 irq = acpi_register_gsi(NULL, gsi, triggering, polarity); 470 if (irq >= 0) { 471 res->start = irq; 472 res->end = irq; 473 } else { 474 irqresource_disabled(res, gsi); 475 } 476 } 477 478 /** 479 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. 480 * @ares: Input ACPI resource object. 481 * @index: Index into the array of GSIs represented by the resource. 482 * @res: Output generic resource object. 483 * 484 * Check if the given ACPI resource object represents an interrupt resource 485 * and @index does not exceed the resource's interrupt count (true is returned 486 * in that case regardless of the results of the other checks)). If that's the 487 * case, register the GSI corresponding to @index from the array of interrupts 488 * represented by the resource and populate the generic resource object pointed 489 * to by @res accordingly. If the registration of the GSI is not successful, 490 * IORESOURCE_DISABLED will be set it that object's flags. 491 * 492 * Return: 493 * 1) false with res->flags setting to zero: not the expected resource type 494 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource 495 * 3) true: valid assigned resource 496 */ 497 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, 498 struct resource *res) 499 { 500 struct acpi_resource_irq *irq; 501 struct acpi_resource_extended_irq *ext_irq; 502 503 switch (ares->type) { 504 case ACPI_RESOURCE_TYPE_IRQ: 505 /* 506 * Per spec, only one interrupt per descriptor is allowed in 507 * _CRS, but some firmware violates this, so parse them all. 508 */ 509 irq = &ares->data.irq; 510 if (index >= irq->interrupt_count) { 511 irqresource_disabled(res, 0); 512 return false; 513 } 514 acpi_dev_get_irqresource(res, irq->interrupts[index], 515 irq->triggering, irq->polarity, 516 irq->shareable, true); 517 break; 518 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 519 ext_irq = &ares->data.extended_irq; 520 if (index >= ext_irq->interrupt_count) { 521 irqresource_disabled(res, 0); 522 return false; 523 } 524 if (is_gsi(ext_irq)) 525 acpi_dev_get_irqresource(res, ext_irq->interrupts[index], 526 ext_irq->triggering, ext_irq->polarity, 527 ext_irq->shareable, false); 528 else 529 irqresource_disabled(res, 0); 530 break; 531 default: 532 res->flags = 0; 533 return false; 534 } 535 536 return true; 537 } 538 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt); 539 540 /** 541 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources(). 542 * @list: The head of the resource list to free. 543 */ 544 void acpi_dev_free_resource_list(struct list_head *list) 545 { 546 resource_list_free(list); 547 } 548 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list); 549 550 struct res_proc_context { 551 struct list_head *list; 552 int (*preproc)(struct acpi_resource *, void *); 553 void *preproc_data; 554 int count; 555 int error; 556 }; 557 558 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win, 559 struct res_proc_context *c) 560 { 561 struct resource_entry *rentry; 562 563 rentry = resource_list_create_entry(NULL, 0); 564 if (!rentry) { 565 c->error = -ENOMEM; 566 return AE_NO_MEMORY; 567 } 568 *rentry->res = win->res; 569 rentry->offset = win->offset; 570 resource_list_add_tail(rentry, c->list); 571 c->count++; 572 return AE_OK; 573 } 574 575 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares, 576 void *context) 577 { 578 struct res_proc_context *c = context; 579 struct resource_win win; 580 struct resource *res = &win.res; 581 int i; 582 583 if (c->preproc) { 584 int ret; 585 586 ret = c->preproc(ares, c->preproc_data); 587 if (ret < 0) { 588 c->error = ret; 589 return AE_ABORT_METHOD; 590 } else if (ret > 0) { 591 return AE_OK; 592 } 593 } 594 595 memset(&win, 0, sizeof(win)); 596 597 if (acpi_dev_resource_memory(ares, res) 598 || acpi_dev_resource_io(ares, res) 599 || acpi_dev_resource_address_space(ares, &win) 600 || acpi_dev_resource_ext_address_space(ares, &win)) 601 return acpi_dev_new_resource_entry(&win, c); 602 603 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) { 604 acpi_status status; 605 606 status = acpi_dev_new_resource_entry(&win, c); 607 if (ACPI_FAILURE(status)) 608 return status; 609 } 610 611 return AE_OK; 612 } 613 614 static int __acpi_dev_get_resources(struct acpi_device *adev, 615 struct list_head *list, 616 int (*preproc)(struct acpi_resource *, void *), 617 void *preproc_data, char *method) 618 { 619 struct res_proc_context c; 620 acpi_status status; 621 622 if (!adev || !adev->handle || !list_empty(list)) 623 return -EINVAL; 624 625 if (!acpi_has_method(adev->handle, method)) 626 return 0; 627 628 c.list = list; 629 c.preproc = preproc; 630 c.preproc_data = preproc_data; 631 c.count = 0; 632 c.error = 0; 633 status = acpi_walk_resources(adev->handle, method, 634 acpi_dev_process_resource, &c); 635 if (ACPI_FAILURE(status)) { 636 acpi_dev_free_resource_list(list); 637 return c.error ? c.error : -EIO; 638 } 639 640 return c.count; 641 } 642 643 /** 644 * acpi_dev_get_resources - Get current resources of a device. 645 * @adev: ACPI device node to get the resources for. 646 * @list: Head of the resultant list of resources (must be empty). 647 * @preproc: The caller's preprocessing routine. 648 * @preproc_data: Pointer passed to the caller's preprocessing routine. 649 * 650 * Evaluate the _CRS method for the given device node and process its output by 651 * (1) executing the @preproc() routine provided by the caller, passing the 652 * resource pointer and @preproc_data to it as arguments, for each ACPI resource 653 * returned and (2) converting all of the returned ACPI resources into struct 654 * resource objects if possible. If the return value of @preproc() in step (1) 655 * is different from 0, step (2) is not applied to the given ACPI resource and 656 * if that value is negative, the whole processing is aborted and that value is 657 * returned as the final error code. 658 * 659 * The resultant struct resource objects are put on the list pointed to by 660 * @list, that must be empty initially, as members of struct resource_entry 661 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to 662 * free that list. 663 * 664 * The number of resources in the output list is returned on success, an error 665 * code reflecting the error condition is returned otherwise. 666 */ 667 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list, 668 int (*preproc)(struct acpi_resource *, void *), 669 void *preproc_data) 670 { 671 return __acpi_dev_get_resources(adev, list, preproc, preproc_data, 672 METHOD_NAME__CRS); 673 } 674 EXPORT_SYMBOL_GPL(acpi_dev_get_resources); 675 676 static int is_memory(struct acpi_resource *ares, void *not_used) 677 { 678 struct resource_win win; 679 struct resource *res = &win.res; 680 681 memset(&win, 0, sizeof(win)); 682 683 return !(acpi_dev_resource_memory(ares, res) 684 || acpi_dev_resource_address_space(ares, &win) 685 || acpi_dev_resource_ext_address_space(ares, &win)); 686 } 687 688 /** 689 * acpi_dev_get_dma_resources - Get current DMA resources of a device. 690 * @adev: ACPI device node to get the resources for. 691 * @list: Head of the resultant list of resources (must be empty). 692 * 693 * Evaluate the _DMA method for the given device node and process its 694 * output. 695 * 696 * The resultant struct resource objects are put on the list pointed to 697 * by @list, that must be empty initially, as members of struct 698 * resource_entry objects. Callers of this routine should use 699 * %acpi_dev_free_resource_list() to free that list. 700 * 701 * The number of resources in the output list is returned on success, 702 * an error code reflecting the error condition is returned otherwise. 703 */ 704 int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list) 705 { 706 return __acpi_dev_get_resources(adev, list, is_memory, NULL, 707 METHOD_NAME__DMA); 708 } 709 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources); 710 711 /** 712 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource 713 * types 714 * @ares: Input ACPI resource object. 715 * @types: Valid resource types of IORESOURCE_XXX 716 * 717 * This is a helper function to support acpi_dev_get_resources(), which filters 718 * ACPI resource objects according to resource types. 719 */ 720 int acpi_dev_filter_resource_type(struct acpi_resource *ares, 721 unsigned long types) 722 { 723 unsigned long type = 0; 724 725 switch (ares->type) { 726 case ACPI_RESOURCE_TYPE_MEMORY24: 727 case ACPI_RESOURCE_TYPE_MEMORY32: 728 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: 729 type = IORESOURCE_MEM; 730 break; 731 case ACPI_RESOURCE_TYPE_IO: 732 case ACPI_RESOURCE_TYPE_FIXED_IO: 733 type = IORESOURCE_IO; 734 break; 735 case ACPI_RESOURCE_TYPE_IRQ: 736 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 737 type = IORESOURCE_IRQ; 738 break; 739 case ACPI_RESOURCE_TYPE_DMA: 740 case ACPI_RESOURCE_TYPE_FIXED_DMA: 741 type = IORESOURCE_DMA; 742 break; 743 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER: 744 type = IORESOURCE_REG; 745 break; 746 case ACPI_RESOURCE_TYPE_ADDRESS16: 747 case ACPI_RESOURCE_TYPE_ADDRESS32: 748 case ACPI_RESOURCE_TYPE_ADDRESS64: 749 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64: 750 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE) 751 type = IORESOURCE_MEM; 752 else if (ares->data.address.resource_type == ACPI_IO_RANGE) 753 type = IORESOURCE_IO; 754 else if (ares->data.address.resource_type == 755 ACPI_BUS_NUMBER_RANGE) 756 type = IORESOURCE_BUS; 757 break; 758 default: 759 break; 760 } 761 762 return (type & types) ? 0 : 1; 763 } 764 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type); 765 766 static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res) 767 { 768 struct list_head resource_list; 769 struct resource_entry *rentry; 770 int ret, found = 0; 771 772 INIT_LIST_HEAD(&resource_list); 773 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); 774 if (ret < 0) 775 return 0; 776 777 list_for_each_entry(rentry, &resource_list, node) { 778 if (resource_contains(rentry->res, res)) { 779 found = 1; 780 break; 781 } 782 783 } 784 785 acpi_dev_free_resource_list(&resource_list); 786 return found; 787 } 788 789 static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth, 790 void *context, void **ret) 791 { 792 struct resource *res = context; 793 struct acpi_device **consumer = (struct acpi_device **) ret; 794 struct acpi_device *adev; 795 796 if (acpi_bus_get_device(handle, &adev)) 797 return AE_OK; 798 799 if (acpi_dev_consumes_res(adev, res)) { 800 *consumer = adev; 801 return AE_CTRL_TERMINATE; 802 } 803 804 return AE_OK; 805 } 806 807 /** 808 * acpi_resource_consumer - Find the ACPI device that consumes @res. 809 * @res: Resource to search for. 810 * 811 * Search the current resource settings (_CRS) of every ACPI device node 812 * for @res. If we find an ACPI device whose _CRS includes @res, return 813 * it. Otherwise, return NULL. 814 */ 815 struct acpi_device *acpi_resource_consumer(struct resource *res) 816 { 817 struct acpi_device *consumer = NULL; 818 819 acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer); 820 return consumer; 821 } 822