1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * irq_domain - IRQ translation domains 4 * 5 * Translation infrastructure between hw and linux irq numbers. This is 6 * helpful for interrupt controllers to implement mapping between hardware 7 * irq numbers and the Linux irq number space. 8 * 9 * irq_domains also have hooks for translating device tree or other 10 * firmware interrupt representations into a hardware irq number that 11 * can be mapped back to a Linux irq number without any extra platform 12 * support code. 13 * 14 * Interrupt controller "domain" data structure. This could be defined as a 15 * irq domain controller. That is, it handles the mapping between hardware 16 * and virtual interrupt numbers for a given interrupt domain. The domain 17 * structure is generally created by the PIC code for a given PIC instance 18 * (though a domain can cover more than one PIC if they have a flat number 19 * model). It's the domain callbacks that are responsible for setting the 20 * irq_chip on a given irq_desc after it's been mapped. 21 * 22 * The host code and data structures use a fwnode_handle pointer to 23 * identify the domain. In some cases, and in order to preserve source 24 * code compatibility, this fwnode pointer is "upgraded" to a DT 25 * device_node. For those firmware infrastructures that do not provide 26 * a unique identifier for an interrupt controller, the irq_domain 27 * code offers a fwnode allocator. 28 */ 29 30 #ifndef _LINUX_IRQDOMAIN_H 31 #define _LINUX_IRQDOMAIN_H 32 33 #include <linux/types.h> 34 #include <linux/irqhandler.h> 35 #include <linux/of.h> 36 #include <linux/mutex.h> 37 #include <linux/radix-tree.h> 38 39 struct device_node; 40 struct irq_domain; 41 struct of_device_id; 42 struct irq_chip; 43 struct irq_data; 44 struct cpumask; 45 struct seq_file; 46 struct irq_affinity_desc; 47 48 /* Number of irqs reserved for a legacy isa controller */ 49 #define NUM_ISA_INTERRUPTS 16 50 51 #define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16 52 53 /** 54 * struct irq_fwspec - generic IRQ specifier structure 55 * 56 * @fwnode: Pointer to a firmware-specific descriptor 57 * @param_count: Number of device-specific parameters 58 * @param: Device-specific parameters 59 * 60 * This structure, directly modeled after of_phandle_args, is used to 61 * pass a device-specific description of an interrupt. 62 */ 63 struct irq_fwspec { 64 struct fwnode_handle *fwnode; 65 int param_count; 66 u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS]; 67 }; 68 69 /* 70 * Should several domains have the same device node, but serve 71 * different purposes (for example one domain is for PCI/MSI, and the 72 * other for wired IRQs), they can be distinguished using a 73 * bus-specific token. Most domains are expected to only carry 74 * DOMAIN_BUS_ANY. 75 */ 76 enum irq_domain_bus_token { 77 DOMAIN_BUS_ANY = 0, 78 DOMAIN_BUS_WIRED, 79 DOMAIN_BUS_GENERIC_MSI, 80 DOMAIN_BUS_PCI_MSI, 81 DOMAIN_BUS_PLATFORM_MSI, 82 DOMAIN_BUS_NEXUS, 83 DOMAIN_BUS_IPI, 84 DOMAIN_BUS_FSL_MC_MSI, 85 DOMAIN_BUS_TI_SCI_INTA_MSI, 86 DOMAIN_BUS_WAKEUP, 87 }; 88 89 /** 90 * struct irq_domain_ops - Methods for irq_domain objects 91 * @match: Match an interrupt controller device node to a host, returns 92 * 1 on a match 93 * @map: Create or update a mapping between a virtual irq number and a hw 94 * irq number. This is called only once for a given mapping. 95 * @unmap: Dispose of such a mapping 96 * @xlate: Given a device tree node and interrupt specifier, decode 97 * the hardware irq number and linux irq type value. 98 * 99 * Functions below are provided by the driver and called whenever a new mapping 100 * is created or an old mapping is disposed. The driver can then proceed to 101 * whatever internal data structures management is required. It also needs 102 * to setup the irq_desc when returning from map(). 103 */ 104 struct irq_domain_ops { 105 int (*match)(struct irq_domain *d, struct device_node *node, 106 enum irq_domain_bus_token bus_token); 107 int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec, 108 enum irq_domain_bus_token bus_token); 109 int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw); 110 void (*unmap)(struct irq_domain *d, unsigned int virq); 111 int (*xlate)(struct irq_domain *d, struct device_node *node, 112 const u32 *intspec, unsigned int intsize, 113 unsigned long *out_hwirq, unsigned int *out_type); 114 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 115 /* extended V2 interfaces to support hierarchy irq_domains */ 116 int (*alloc)(struct irq_domain *d, unsigned int virq, 117 unsigned int nr_irqs, void *arg); 118 void (*free)(struct irq_domain *d, unsigned int virq, 119 unsigned int nr_irqs); 120 int (*activate)(struct irq_domain *d, struct irq_data *irqd, bool reserve); 121 void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data); 122 int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec, 123 unsigned long *out_hwirq, unsigned int *out_type); 124 #endif 125 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 126 void (*debug_show)(struct seq_file *m, struct irq_domain *d, 127 struct irq_data *irqd, int ind); 128 #endif 129 }; 130 131 extern struct irq_domain_ops irq_generic_chip_ops; 132 133 struct irq_domain_chip_generic; 134 135 /** 136 * struct irq_domain - Hardware interrupt number translation object 137 * @link: Element in global irq_domain list. 138 * @name: Name of interrupt domain 139 * @ops: pointer to irq_domain methods 140 * @host_data: private data pointer for use by owner. Not touched by irq_domain 141 * core code. 142 * @flags: host per irq_domain flags 143 * @mapcount: The number of mapped interrupts 144 * 145 * Optional elements 146 * @fwnode: Pointer to firmware node associated with the irq_domain. Pretty easy 147 * to swap it for the of_node via the irq_domain_get_of_node accessor 148 * @gc: Pointer to a list of generic chips. There is a helper function for 149 * setting up one or more generic chips for interrupt controllers 150 * drivers using the generic chip library which uses this pointer. 151 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains 152 * @debugfs_file: dentry for the domain debugfs file 153 * 154 * Revmap data, used internally by irq_domain 155 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that 156 * support direct mapping 157 * @revmap_size: Size of the linear map table @linear_revmap[] 158 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map 159 * @linear_revmap: Linear table of hwirq->virq reverse mappings 160 */ 161 struct irq_domain { 162 struct list_head link; 163 const char *name; 164 const struct irq_domain_ops *ops; 165 void *host_data; 166 unsigned int flags; 167 unsigned int mapcount; 168 169 /* Optional data */ 170 struct fwnode_handle *fwnode; 171 enum irq_domain_bus_token bus_token; 172 struct irq_domain_chip_generic *gc; 173 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 174 struct irq_domain *parent; 175 #endif 176 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 177 struct dentry *debugfs_file; 178 #endif 179 180 /* reverse map data. The linear map gets appended to the irq_domain */ 181 irq_hw_number_t hwirq_max; 182 unsigned int revmap_direct_max_irq; 183 unsigned int revmap_size; 184 struct radix_tree_root revmap_tree; 185 struct mutex revmap_tree_mutex; 186 unsigned int linear_revmap[]; 187 }; 188 189 /* Irq domain flags */ 190 enum { 191 /* Irq domain is hierarchical */ 192 IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0), 193 194 /* Irq domain name was allocated in __irq_domain_add() */ 195 IRQ_DOMAIN_NAME_ALLOCATED = (1 << 1), 196 197 /* Irq domain is an IPI domain with virq per cpu */ 198 IRQ_DOMAIN_FLAG_IPI_PER_CPU = (1 << 2), 199 200 /* Irq domain is an IPI domain with single virq */ 201 IRQ_DOMAIN_FLAG_IPI_SINGLE = (1 << 3), 202 203 /* Irq domain implements MSIs */ 204 IRQ_DOMAIN_FLAG_MSI = (1 << 4), 205 206 /* Irq domain implements MSI remapping */ 207 IRQ_DOMAIN_FLAG_MSI_REMAP = (1 << 5), 208 209 /* 210 * Quirk to handle MSI implementations which do not provide 211 * masking. Currently known to affect x86, but partially 212 * handled in core code. 213 */ 214 IRQ_DOMAIN_MSI_NOMASK_QUIRK = (1 << 6), 215 216 /* 217 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved 218 * for implementation specific purposes and ignored by the 219 * core code. 220 */ 221 IRQ_DOMAIN_FLAG_NONCORE = (1 << 16), 222 }; 223 224 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d) 225 { 226 return to_of_node(d->fwnode); 227 } 228 229 #ifdef CONFIG_IRQ_DOMAIN 230 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id, 231 const char *name, phys_addr_t *pa); 232 233 enum { 234 IRQCHIP_FWNODE_REAL, 235 IRQCHIP_FWNODE_NAMED, 236 IRQCHIP_FWNODE_NAMED_ID, 237 }; 238 239 static inline 240 struct fwnode_handle *irq_domain_alloc_named_fwnode(const char *name) 241 { 242 return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL); 243 } 244 245 static inline 246 struct fwnode_handle *irq_domain_alloc_named_id_fwnode(const char *name, int id) 247 { 248 return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED_ID, id, name, 249 NULL); 250 } 251 252 static inline struct fwnode_handle *irq_domain_alloc_fwnode(phys_addr_t *pa) 253 { 254 return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, pa); 255 } 256 257 void irq_domain_free_fwnode(struct fwnode_handle *fwnode); 258 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, 259 irq_hw_number_t hwirq_max, int direct_max, 260 const struct irq_domain_ops *ops, 261 void *host_data); 262 struct irq_domain *irq_domain_add_simple(struct device_node *of_node, 263 unsigned int size, 264 unsigned int first_irq, 265 const struct irq_domain_ops *ops, 266 void *host_data); 267 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, 268 unsigned int size, 269 unsigned int first_irq, 270 irq_hw_number_t first_hwirq, 271 const struct irq_domain_ops *ops, 272 void *host_data); 273 extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec, 274 enum irq_domain_bus_token bus_token); 275 extern bool irq_domain_check_msi_remap(void); 276 extern void irq_set_default_host(struct irq_domain *host); 277 extern struct irq_domain *irq_get_default_host(void); 278 extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs, 279 irq_hw_number_t hwirq, int node, 280 const struct irq_affinity_desc *affinity); 281 282 static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node) 283 { 284 return node ? &node->fwnode : NULL; 285 } 286 287 extern const struct fwnode_operations irqchip_fwnode_ops; 288 289 static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode) 290 { 291 return fwnode && fwnode->ops == &irqchip_fwnode_ops; 292 } 293 294 extern void irq_domain_update_bus_token(struct irq_domain *domain, 295 enum irq_domain_bus_token bus_token); 296 297 static inline 298 struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode, 299 enum irq_domain_bus_token bus_token) 300 { 301 struct irq_fwspec fwspec = { 302 .fwnode = fwnode, 303 }; 304 305 return irq_find_matching_fwspec(&fwspec, bus_token); 306 } 307 308 static inline struct irq_domain *irq_find_matching_host(struct device_node *node, 309 enum irq_domain_bus_token bus_token) 310 { 311 return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token); 312 } 313 314 static inline struct irq_domain *irq_find_host(struct device_node *node) 315 { 316 struct irq_domain *d; 317 318 d = irq_find_matching_host(node, DOMAIN_BUS_WIRED); 319 if (!d) 320 d = irq_find_matching_host(node, DOMAIN_BUS_ANY); 321 322 return d; 323 } 324 325 /** 326 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain. 327 * @of_node: pointer to interrupt controller's device tree node. 328 * @size: Number of interrupts in the domain. 329 * @ops: map/unmap domain callbacks 330 * @host_data: Controller private data pointer 331 */ 332 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node, 333 unsigned int size, 334 const struct irq_domain_ops *ops, 335 void *host_data) 336 { 337 return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data); 338 } 339 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, 340 unsigned int max_irq, 341 const struct irq_domain_ops *ops, 342 void *host_data) 343 { 344 return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data); 345 } 346 static inline struct irq_domain *irq_domain_add_legacy_isa( 347 struct device_node *of_node, 348 const struct irq_domain_ops *ops, 349 void *host_data) 350 { 351 return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops, 352 host_data); 353 } 354 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node, 355 const struct irq_domain_ops *ops, 356 void *host_data) 357 { 358 return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data); 359 } 360 361 static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode, 362 unsigned int size, 363 const struct irq_domain_ops *ops, 364 void *host_data) 365 { 366 return __irq_domain_add(fwnode, size, size, 0, ops, host_data); 367 } 368 369 static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode, 370 const struct irq_domain_ops *ops, 371 void *host_data) 372 { 373 return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data); 374 } 375 376 extern void irq_domain_remove(struct irq_domain *host); 377 378 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq, 379 irq_hw_number_t hwirq); 380 extern void irq_domain_associate_many(struct irq_domain *domain, 381 unsigned int irq_base, 382 irq_hw_number_t hwirq_base, int count); 383 extern void irq_domain_disassociate(struct irq_domain *domain, 384 unsigned int irq); 385 386 extern unsigned int irq_create_mapping(struct irq_domain *host, 387 irq_hw_number_t hwirq); 388 extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec); 389 extern void irq_dispose_mapping(unsigned int virq); 390 391 /** 392 * irq_linear_revmap() - Find a linux irq from a hw irq number. 393 * @domain: domain owning this hardware interrupt 394 * @hwirq: hardware irq number in that domain space 395 * 396 * This is a fast path alternative to irq_find_mapping() that can be 397 * called directly by irq controller code to save a handful of 398 * instructions. It is always safe to call, but won't find irqs mapped 399 * using the radix tree. 400 */ 401 static inline unsigned int irq_linear_revmap(struct irq_domain *domain, 402 irq_hw_number_t hwirq) 403 { 404 return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0; 405 } 406 extern unsigned int irq_find_mapping(struct irq_domain *host, 407 irq_hw_number_t hwirq); 408 extern unsigned int irq_create_direct_mapping(struct irq_domain *host); 409 extern int irq_create_strict_mappings(struct irq_domain *domain, 410 unsigned int irq_base, 411 irq_hw_number_t hwirq_base, int count); 412 413 static inline int irq_create_identity_mapping(struct irq_domain *host, 414 irq_hw_number_t hwirq) 415 { 416 return irq_create_strict_mappings(host, hwirq, hwirq, 1); 417 } 418 419 extern const struct irq_domain_ops irq_domain_simple_ops; 420 421 /* stock xlate functions */ 422 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, 423 const u32 *intspec, unsigned int intsize, 424 irq_hw_number_t *out_hwirq, unsigned int *out_type); 425 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, 426 const u32 *intspec, unsigned int intsize, 427 irq_hw_number_t *out_hwirq, unsigned int *out_type); 428 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr, 429 const u32 *intspec, unsigned int intsize, 430 irq_hw_number_t *out_hwirq, unsigned int *out_type); 431 432 int irq_domain_translate_twocell(struct irq_domain *d, 433 struct irq_fwspec *fwspec, 434 unsigned long *out_hwirq, 435 unsigned int *out_type); 436 437 int irq_domain_translate_onecell(struct irq_domain *d, 438 struct irq_fwspec *fwspec, 439 unsigned long *out_hwirq, 440 unsigned int *out_type); 441 442 /* IPI functions */ 443 int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest); 444 int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest); 445 446 /* V2 interfaces to support hierarchy IRQ domains. */ 447 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, 448 unsigned int virq); 449 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq, 450 irq_hw_number_t hwirq, struct irq_chip *chip, 451 void *chip_data, irq_flow_handler_t handler, 452 void *handler_data, const char *handler_name); 453 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 454 extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent, 455 unsigned int flags, unsigned int size, 456 struct fwnode_handle *fwnode, 457 const struct irq_domain_ops *ops, void *host_data); 458 459 static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent, 460 unsigned int flags, 461 unsigned int size, 462 struct device_node *node, 463 const struct irq_domain_ops *ops, 464 void *host_data) 465 { 466 return irq_domain_create_hierarchy(parent, flags, size, 467 of_node_to_fwnode(node), 468 ops, host_data); 469 } 470 471 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, 472 unsigned int nr_irqs, int node, void *arg, 473 bool realloc, 474 const struct irq_affinity_desc *affinity); 475 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs); 476 extern int irq_domain_activate_irq(struct irq_data *irq_data, bool early); 477 extern void irq_domain_deactivate_irq(struct irq_data *irq_data); 478 479 static inline int irq_domain_alloc_irqs(struct irq_domain *domain, 480 unsigned int nr_irqs, int node, void *arg) 481 { 482 return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false, 483 NULL); 484 } 485 486 extern int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain, 487 unsigned int irq_base, 488 unsigned int nr_irqs, void *arg); 489 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, 490 unsigned int virq, 491 irq_hw_number_t hwirq, 492 struct irq_chip *chip, 493 void *chip_data); 494 extern void irq_domain_reset_irq_data(struct irq_data *irq_data); 495 extern void irq_domain_free_irqs_common(struct irq_domain *domain, 496 unsigned int virq, 497 unsigned int nr_irqs); 498 extern void irq_domain_free_irqs_top(struct irq_domain *domain, 499 unsigned int virq, unsigned int nr_irqs); 500 501 extern int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg); 502 extern int irq_domain_pop_irq(struct irq_domain *domain, int virq); 503 504 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain, 505 unsigned int irq_base, 506 unsigned int nr_irqs, void *arg); 507 508 extern void irq_domain_free_irqs_parent(struct irq_domain *domain, 509 unsigned int irq_base, 510 unsigned int nr_irqs); 511 512 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain) 513 { 514 return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY; 515 } 516 517 static inline bool irq_domain_is_ipi(struct irq_domain *domain) 518 { 519 return domain->flags & 520 (IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE); 521 } 522 523 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain) 524 { 525 return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU; 526 } 527 528 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain) 529 { 530 return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE; 531 } 532 533 static inline bool irq_domain_is_msi(struct irq_domain *domain) 534 { 535 return domain->flags & IRQ_DOMAIN_FLAG_MSI; 536 } 537 538 static inline bool irq_domain_is_msi_remap(struct irq_domain *domain) 539 { 540 return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP; 541 } 542 543 extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain); 544 545 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ 546 static inline int irq_domain_alloc_irqs(struct irq_domain *domain, 547 unsigned int nr_irqs, int node, void *arg) 548 { 549 return -1; 550 } 551 552 static inline void irq_domain_free_irqs(unsigned int virq, 553 unsigned int nr_irqs) { } 554 555 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain) 556 { 557 return false; 558 } 559 560 static inline bool irq_domain_is_ipi(struct irq_domain *domain) 561 { 562 return false; 563 } 564 565 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain) 566 { 567 return false; 568 } 569 570 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain) 571 { 572 return false; 573 } 574 575 static inline bool irq_domain_is_msi(struct irq_domain *domain) 576 { 577 return false; 578 } 579 580 static inline bool irq_domain_is_msi_remap(struct irq_domain *domain) 581 { 582 return false; 583 } 584 585 static inline bool 586 irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain) 587 { 588 return false; 589 } 590 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ 591 592 #else /* CONFIG_IRQ_DOMAIN */ 593 static inline void irq_dispose_mapping(unsigned int virq) { } 594 static inline struct irq_domain *irq_find_matching_fwnode( 595 struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token) 596 { 597 return NULL; 598 } 599 static inline bool irq_domain_check_msi_remap(void) 600 { 601 return false; 602 } 603 #endif /* !CONFIG_IRQ_DOMAIN */ 604 605 #endif /* _LINUX_IRQDOMAIN_H */ 606