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 * @wake_capable: Wake capability as provided by ACPI. 340 */ 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 */ 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 B2502", 437 .matches = { 438 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 439 DMI_MATCH(DMI_BOARD_NAME, "B2502CBA"), 440 }, 441 }, 442 { } 443 }; 444 445 static const struct dmi_system_id lenovo_laptop[] = { 446 { 447 .ident = "LENOVO IdeaPad Flex 5 14ALC7", 448 .matches = { 449 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 450 DMI_MATCH(DMI_PRODUCT_NAME, "82R9"), 451 }, 452 }, 453 { 454 .ident = "LENOVO IdeaPad Flex 5 16ALC7", 455 .matches = { 456 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 457 DMI_MATCH(DMI_PRODUCT_NAME, "82RA"), 458 }, 459 }, 460 { } 461 }; 462 463 static const struct dmi_system_id schenker_gm_rg[] = { 464 { 465 .ident = "XMG CORE 15 (M22)", 466 .matches = { 467 DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"), 468 DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"), 469 }, 470 }, 471 { } 472 }; 473 474 struct irq_override_cmp { 475 const struct dmi_system_id *system; 476 unsigned char irq; 477 unsigned char triggering; 478 unsigned char polarity; 479 unsigned char shareable; 480 bool override; 481 }; 482 483 static const struct irq_override_cmp override_table[] = { 484 { medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false }, 485 { asus_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false }, 486 { lenovo_laptop, 6, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true }, 487 { lenovo_laptop, 10, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true }, 488 { schenker_gm_rg, 1, ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_LOW, 1, true }, 489 }; 490 491 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity, 492 u8 shareable) 493 { 494 int i; 495 496 for (i = 0; i < ARRAY_SIZE(override_table); i++) { 497 const struct irq_override_cmp *entry = &override_table[i]; 498 499 if (dmi_check_system(entry->system) && 500 entry->irq == gsi && 501 entry->triggering == triggering && 502 entry->polarity == polarity && 503 entry->shareable == shareable) 504 return entry->override; 505 } 506 507 #ifdef CONFIG_X86 508 /* 509 * IRQ override isn't needed on modern AMD Zen systems and 510 * this override breaks active low IRQs on AMD Ryzen 6000 and 511 * newer systems. Skip it. 512 */ 513 if (boot_cpu_has(X86_FEATURE_ZEN)) 514 return false; 515 #endif 516 517 return true; 518 } 519 520 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, 521 u8 triggering, u8 polarity, u8 shareable, 522 u8 wake_capable, bool check_override) 523 { 524 int irq, p, t; 525 526 if (!valid_IRQ(gsi)) { 527 irqresource_disabled(res, gsi); 528 return; 529 } 530 531 /* 532 * In IO-APIC mode, use overridden attribute. Two reasons: 533 * 1. BIOS bug in DSDT 534 * 2. BIOS uses IO-APIC mode Interrupt Source Override 535 * 536 * We do this only if we are dealing with IRQ() or IRQNoFlags() 537 * resource (the legacy ISA resources). With modern ACPI 5 devices 538 * using extended IRQ descriptors we take the IRQ configuration 539 * from _CRS directly. 540 */ 541 if (check_override && 542 acpi_dev_irq_override(gsi, triggering, polarity, shareable) && 543 !acpi_get_override_irq(gsi, &t, &p)) { 544 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; 545 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; 546 547 if (triggering != trig || polarity != pol) { 548 pr_warn("ACPI: IRQ %d override to %s%s, %s%s\n", gsi, 549 t ? "level" : "edge", 550 trig == triggering ? "" : "(!)", 551 p ? "low" : "high", 552 pol == polarity ? "" : "(!)"); 553 triggering = trig; 554 polarity = pol; 555 } 556 } 557 558 res->flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable); 559 irq = acpi_register_gsi(NULL, gsi, triggering, polarity); 560 if (irq >= 0) { 561 res->start = irq; 562 res->end = irq; 563 } else { 564 irqresource_disabled(res, gsi); 565 } 566 } 567 568 /** 569 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. 570 * @ares: Input ACPI resource object. 571 * @index: Index into the array of GSIs represented by the resource. 572 * @res: Output generic resource object. 573 * 574 * Check if the given ACPI resource object represents an interrupt resource 575 * and @index does not exceed the resource's interrupt count (true is returned 576 * in that case regardless of the results of the other checks)). If that's the 577 * case, register the GSI corresponding to @index from the array of interrupts 578 * represented by the resource and populate the generic resource object pointed 579 * to by @res accordingly. If the registration of the GSI is not successful, 580 * IORESOURCE_DISABLED will be set it that object's flags. 581 * 582 * Return: 583 * 1) false with res->flags setting to zero: not the expected resource type 584 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource 585 * 3) true: valid assigned resource 586 */ 587 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, 588 struct resource *res) 589 { 590 struct acpi_resource_irq *irq; 591 struct acpi_resource_extended_irq *ext_irq; 592 593 switch (ares->type) { 594 case ACPI_RESOURCE_TYPE_IRQ: 595 /* 596 * Per spec, only one interrupt per descriptor is allowed in 597 * _CRS, but some firmware violates this, so parse them all. 598 */ 599 irq = &ares->data.irq; 600 if (index >= irq->interrupt_count) { 601 irqresource_disabled(res, 0); 602 return false; 603 } 604 acpi_dev_get_irqresource(res, irq->interrupts[index], 605 irq->triggering, irq->polarity, 606 irq->shareable, irq->wake_capable, 607 true); 608 break; 609 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 610 ext_irq = &ares->data.extended_irq; 611 if (index >= ext_irq->interrupt_count) { 612 irqresource_disabled(res, 0); 613 return false; 614 } 615 if (is_gsi(ext_irq)) 616 acpi_dev_get_irqresource(res, ext_irq->interrupts[index], 617 ext_irq->triggering, ext_irq->polarity, 618 ext_irq->shareable, ext_irq->wake_capable, 619 false); 620 else 621 irqresource_disabled(res, 0); 622 break; 623 default: 624 res->flags = 0; 625 return false; 626 } 627 628 return true; 629 } 630 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt); 631 632 /** 633 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources(). 634 * @list: The head of the resource list to free. 635 */ 636 void acpi_dev_free_resource_list(struct list_head *list) 637 { 638 resource_list_free(list); 639 } 640 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list); 641 642 struct res_proc_context { 643 struct list_head *list; 644 int (*preproc)(struct acpi_resource *, void *); 645 void *preproc_data; 646 int count; 647 int error; 648 }; 649 650 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win, 651 struct res_proc_context *c) 652 { 653 struct resource_entry *rentry; 654 655 rentry = resource_list_create_entry(NULL, 0); 656 if (!rentry) { 657 c->error = -ENOMEM; 658 return AE_NO_MEMORY; 659 } 660 *rentry->res = win->res; 661 rentry->offset = win->offset; 662 resource_list_add_tail(rentry, c->list); 663 c->count++; 664 return AE_OK; 665 } 666 667 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares, 668 void *context) 669 { 670 struct res_proc_context *c = context; 671 struct resource_win win; 672 struct resource *res = &win.res; 673 int i; 674 675 if (c->preproc) { 676 int ret; 677 678 ret = c->preproc(ares, c->preproc_data); 679 if (ret < 0) { 680 c->error = ret; 681 return AE_ABORT_METHOD; 682 } else if (ret > 0) { 683 return AE_OK; 684 } 685 } 686 687 memset(&win, 0, sizeof(win)); 688 689 if (acpi_dev_resource_memory(ares, res) 690 || acpi_dev_resource_io(ares, res) 691 || acpi_dev_resource_address_space(ares, &win) 692 || acpi_dev_resource_ext_address_space(ares, &win)) 693 return acpi_dev_new_resource_entry(&win, c); 694 695 for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) { 696 acpi_status status; 697 698 status = acpi_dev_new_resource_entry(&win, c); 699 if (ACPI_FAILURE(status)) 700 return status; 701 } 702 703 return AE_OK; 704 } 705 706 static int __acpi_dev_get_resources(struct acpi_device *adev, 707 struct list_head *list, 708 int (*preproc)(struct acpi_resource *, void *), 709 void *preproc_data, char *method) 710 { 711 struct res_proc_context c; 712 acpi_status status; 713 714 if (!adev || !adev->handle || !list_empty(list)) 715 return -EINVAL; 716 717 if (!acpi_has_method(adev->handle, method)) 718 return 0; 719 720 c.list = list; 721 c.preproc = preproc; 722 c.preproc_data = preproc_data; 723 c.count = 0; 724 c.error = 0; 725 status = acpi_walk_resources(adev->handle, method, 726 acpi_dev_process_resource, &c); 727 if (ACPI_FAILURE(status)) { 728 acpi_dev_free_resource_list(list); 729 return c.error ? c.error : -EIO; 730 } 731 732 return c.count; 733 } 734 735 /** 736 * acpi_dev_get_resources - Get current resources of a device. 737 * @adev: ACPI device node to get the resources for. 738 * @list: Head of the resultant list of resources (must be empty). 739 * @preproc: The caller's preprocessing routine. 740 * @preproc_data: Pointer passed to the caller's preprocessing routine. 741 * 742 * Evaluate the _CRS method for the given device node and process its output by 743 * (1) executing the @preproc() routine provided by the caller, passing the 744 * resource pointer and @preproc_data to it as arguments, for each ACPI resource 745 * returned and (2) converting all of the returned ACPI resources into struct 746 * resource objects if possible. If the return value of @preproc() in step (1) 747 * is different from 0, step (2) is not applied to the given ACPI resource and 748 * if that value is negative, the whole processing is aborted and that value is 749 * returned as the final error code. 750 * 751 * The resultant struct resource objects are put on the list pointed to by 752 * @list, that must be empty initially, as members of struct resource_entry 753 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to 754 * free that list. 755 * 756 * The number of resources in the output list is returned on success, an error 757 * code reflecting the error condition is returned otherwise. 758 */ 759 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list, 760 int (*preproc)(struct acpi_resource *, void *), 761 void *preproc_data) 762 { 763 return __acpi_dev_get_resources(adev, list, preproc, preproc_data, 764 METHOD_NAME__CRS); 765 } 766 EXPORT_SYMBOL_GPL(acpi_dev_get_resources); 767 768 static int is_memory(struct acpi_resource *ares, void *not_used) 769 { 770 struct resource_win win; 771 struct resource *res = &win.res; 772 773 memset(&win, 0, sizeof(win)); 774 775 if (acpi_dev_filter_resource_type(ares, IORESOURCE_MEM)) 776 return 1; 777 778 return !(acpi_dev_resource_memory(ares, res) 779 || acpi_dev_resource_address_space(ares, &win) 780 || acpi_dev_resource_ext_address_space(ares, &win)); 781 } 782 783 /** 784 * acpi_dev_get_dma_resources - Get current DMA resources of a device. 785 * @adev: ACPI device node to get the resources for. 786 * @list: Head of the resultant list of resources (must be empty). 787 * 788 * Evaluate the _DMA method for the given device node and process its 789 * output. 790 * 791 * The resultant struct resource objects are put on the list pointed to 792 * by @list, that must be empty initially, as members of struct 793 * resource_entry objects. Callers of this routine should use 794 * %acpi_dev_free_resource_list() to free that list. 795 * 796 * The number of resources in the output list is returned on success, 797 * an error code reflecting the error condition is returned otherwise. 798 */ 799 int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list) 800 { 801 return __acpi_dev_get_resources(adev, list, is_memory, NULL, 802 METHOD_NAME__DMA); 803 } 804 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources); 805 806 /** 807 * acpi_dev_get_memory_resources - Get current memory resources of a device. 808 * @adev: ACPI device node to get the resources for. 809 * @list: Head of the resultant list of resources (must be empty). 810 * 811 * This is a helper function that locates all memory type resources of @adev 812 * with acpi_dev_get_resources(). 813 * 814 * The number of resources in the output list is returned on success, an error 815 * code reflecting the error condition is returned otherwise. 816 */ 817 int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list) 818 { 819 return acpi_dev_get_resources(adev, list, is_memory, NULL); 820 } 821 EXPORT_SYMBOL_GPL(acpi_dev_get_memory_resources); 822 823 /** 824 * acpi_dev_filter_resource_type - Filter ACPI resource according to resource 825 * types 826 * @ares: Input ACPI resource object. 827 * @types: Valid resource types of IORESOURCE_XXX 828 * 829 * This is a helper function to support acpi_dev_get_resources(), which filters 830 * ACPI resource objects according to resource types. 831 */ 832 int acpi_dev_filter_resource_type(struct acpi_resource *ares, 833 unsigned long types) 834 { 835 unsigned long type = 0; 836 837 switch (ares->type) { 838 case ACPI_RESOURCE_TYPE_MEMORY24: 839 case ACPI_RESOURCE_TYPE_MEMORY32: 840 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: 841 type = IORESOURCE_MEM; 842 break; 843 case ACPI_RESOURCE_TYPE_IO: 844 case ACPI_RESOURCE_TYPE_FIXED_IO: 845 type = IORESOURCE_IO; 846 break; 847 case ACPI_RESOURCE_TYPE_IRQ: 848 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 849 type = IORESOURCE_IRQ; 850 break; 851 case ACPI_RESOURCE_TYPE_DMA: 852 case ACPI_RESOURCE_TYPE_FIXED_DMA: 853 type = IORESOURCE_DMA; 854 break; 855 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER: 856 type = IORESOURCE_REG; 857 break; 858 case ACPI_RESOURCE_TYPE_ADDRESS16: 859 case ACPI_RESOURCE_TYPE_ADDRESS32: 860 case ACPI_RESOURCE_TYPE_ADDRESS64: 861 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64: 862 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE) 863 type = IORESOURCE_MEM; 864 else if (ares->data.address.resource_type == ACPI_IO_RANGE) 865 type = IORESOURCE_IO; 866 else if (ares->data.address.resource_type == 867 ACPI_BUS_NUMBER_RANGE) 868 type = IORESOURCE_BUS; 869 break; 870 default: 871 break; 872 } 873 874 return (type & types) ? 0 : 1; 875 } 876 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type); 877 878 static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res) 879 { 880 struct list_head resource_list; 881 struct resource_entry *rentry; 882 int ret, found = 0; 883 884 INIT_LIST_HEAD(&resource_list); 885 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); 886 if (ret < 0) 887 return 0; 888 889 list_for_each_entry(rentry, &resource_list, node) { 890 if (resource_contains(rentry->res, res)) { 891 found = 1; 892 break; 893 } 894 895 } 896 897 acpi_dev_free_resource_list(&resource_list); 898 return found; 899 } 900 901 static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth, 902 void *context, void **ret) 903 { 904 struct resource *res = context; 905 struct acpi_device **consumer = (struct acpi_device **) ret; 906 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 907 908 if (!adev) 909 return AE_OK; 910 911 if (acpi_dev_consumes_res(adev, res)) { 912 *consumer = adev; 913 return AE_CTRL_TERMINATE; 914 } 915 916 return AE_OK; 917 } 918 919 /** 920 * acpi_resource_consumer - Find the ACPI device that consumes @res. 921 * @res: Resource to search for. 922 * 923 * Search the current resource settings (_CRS) of every ACPI device node 924 * for @res. If we find an ACPI device whose _CRS includes @res, return 925 * it. Otherwise, return NULL. 926 */ 927 struct acpi_device *acpi_resource_consumer(struct resource *res) 928 { 929 struct acpi_device *consumer = NULL; 930 931 acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer); 932 return consumer; 933 } 934