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