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