1 /* 2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. 3 * Author: Joerg Roedel <[email protected]> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published 7 * by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 19 #ifndef __LINUX_IOMMU_H 20 #define __LINUX_IOMMU_H 21 22 #include <linux/errno.h> 23 #include <linux/err.h> 24 #include <linux/of.h> 25 #include <linux/types.h> 26 #include <linux/scatterlist.h> 27 #include <trace/events/iommu.h> 28 29 #define IOMMU_READ (1 << 0) 30 #define IOMMU_WRITE (1 << 1) 31 #define IOMMU_CACHE (1 << 2) /* DMA cache coherency */ 32 #define IOMMU_NOEXEC (1 << 3) 33 #define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */ 34 /* 35 * This is to make the IOMMU API setup privileged 36 * mapppings accessible by the master only at higher 37 * privileged execution level and inaccessible at 38 * less privileged levels. 39 */ 40 #define IOMMU_PRIV (1 << 5) 41 42 struct iommu_ops; 43 struct iommu_group; 44 struct bus_type; 45 struct device; 46 struct iommu_domain; 47 struct notifier_block; 48 49 /* iommu fault flags */ 50 #define IOMMU_FAULT_READ 0x0 51 #define IOMMU_FAULT_WRITE 0x1 52 53 typedef int (*iommu_fault_handler_t)(struct iommu_domain *, 54 struct device *, unsigned long, int, void *); 55 56 struct iommu_domain_geometry { 57 dma_addr_t aperture_start; /* First address that can be mapped */ 58 dma_addr_t aperture_end; /* Last address that can be mapped */ 59 bool force_aperture; /* DMA only allowed in mappable range? */ 60 }; 61 62 /* Domain feature flags */ 63 #define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */ 64 #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API 65 implementation */ 66 #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ 67 68 /* 69 * This are the possible domain-types 70 * 71 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate 72 * devices 73 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses 74 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used 75 * for VMs 76 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations. 77 * This flag allows IOMMU drivers to implement 78 * certain optimizations for these domains 79 */ 80 #define IOMMU_DOMAIN_BLOCKED (0U) 81 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT) 82 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING) 83 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \ 84 __IOMMU_DOMAIN_DMA_API) 85 86 struct iommu_domain { 87 unsigned type; 88 const struct iommu_ops *ops; 89 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */ 90 iommu_fault_handler_t handler; 91 void *handler_token; 92 struct iommu_domain_geometry geometry; 93 void *iova_cookie; 94 }; 95 96 enum iommu_cap { 97 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA 98 transactions */ 99 IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */ 100 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */ 101 }; 102 103 /* 104 * Following constraints are specifc to FSL_PAMUV1: 105 * -aperture must be power of 2, and naturally aligned 106 * -number of windows must be power of 2, and address space size 107 * of each window is determined by aperture size / # of windows 108 * -the actual size of the mapped region of a window must be power 109 * of 2 starting with 4KB and physical address must be naturally 110 * aligned. 111 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints. 112 * The caller can invoke iommu_domain_get_attr to check if the underlying 113 * iommu implementation supports these constraints. 114 */ 115 116 enum iommu_attr { 117 DOMAIN_ATTR_GEOMETRY, 118 DOMAIN_ATTR_PAGING, 119 DOMAIN_ATTR_WINDOWS, 120 DOMAIN_ATTR_FSL_PAMU_STASH, 121 DOMAIN_ATTR_FSL_PAMU_ENABLE, 122 DOMAIN_ATTR_FSL_PAMUV1, 123 DOMAIN_ATTR_NESTING, /* two stages of translation */ 124 DOMAIN_ATTR_MAX, 125 }; 126 127 /* These are the possible reserved region types */ 128 #define IOMMU_RESV_DIRECT (1 << 0) 129 #define IOMMU_RESV_RESERVED (1 << 1) 130 #define IOMMU_RESV_MSI (1 << 2) 131 132 /** 133 * struct iommu_resv_region - descriptor for a reserved memory region 134 * @list: Linked list pointers 135 * @start: System physical start address of the region 136 * @length: Length of the region in bytes 137 * @prot: IOMMU Protection flags (READ/WRITE/...) 138 * @type: Type of the reserved region 139 */ 140 struct iommu_resv_region { 141 struct list_head list; 142 phys_addr_t start; 143 size_t length; 144 int prot; 145 int type; 146 }; 147 148 #ifdef CONFIG_IOMMU_API 149 150 /** 151 * struct iommu_ops - iommu ops and capabilities 152 * @capable: check capability 153 * @domain_alloc: allocate iommu domain 154 * @domain_free: free iommu domain 155 * @attach_dev: attach device to an iommu domain 156 * @detach_dev: detach device from an iommu domain 157 * @map: map a physically contiguous memory region to an iommu domain 158 * @unmap: unmap a physically contiguous memory region from an iommu domain 159 * @map_sg: map a scatter-gather list of physically contiguous memory chunks 160 * to an iommu domain 161 * @iova_to_phys: translate iova to physical address 162 * @add_device: add device to iommu grouping 163 * @remove_device: remove device from iommu grouping 164 * @device_group: find iommu group for a particular device 165 * @domain_get_attr: Query domain attributes 166 * @domain_set_attr: Change domain attributes 167 * @get_resv_regions: Request list of reserved regions for a device 168 * @put_resv_regions: Free list of reserved regions for a device 169 * @apply_resv_region: Temporary helper call-back for iova reserved ranges 170 * @domain_window_enable: Configure and enable a particular window for a domain 171 * @domain_window_disable: Disable a particular window for a domain 172 * @domain_set_windows: Set the number of windows for a domain 173 * @domain_get_windows: Return the number of windows for a domain 174 * @of_xlate: add OF master IDs to iommu grouping 175 * @pgsize_bitmap: bitmap of all possible supported page sizes 176 */ 177 struct iommu_ops { 178 bool (*capable)(enum iommu_cap); 179 180 /* Domain allocation and freeing by the iommu driver */ 181 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); 182 void (*domain_free)(struct iommu_domain *); 183 184 int (*attach_dev)(struct iommu_domain *domain, struct device *dev); 185 void (*detach_dev)(struct iommu_domain *domain, struct device *dev); 186 int (*map)(struct iommu_domain *domain, unsigned long iova, 187 phys_addr_t paddr, size_t size, int prot); 188 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, 189 size_t size); 190 size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova, 191 struct scatterlist *sg, unsigned int nents, int prot); 192 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova); 193 int (*add_device)(struct device *dev); 194 void (*remove_device)(struct device *dev); 195 struct iommu_group *(*device_group)(struct device *dev); 196 int (*domain_get_attr)(struct iommu_domain *domain, 197 enum iommu_attr attr, void *data); 198 int (*domain_set_attr)(struct iommu_domain *domain, 199 enum iommu_attr attr, void *data); 200 201 /* Request/Free a list of reserved regions for a device */ 202 void (*get_resv_regions)(struct device *dev, struct list_head *list); 203 void (*put_resv_regions)(struct device *dev, struct list_head *list); 204 void (*apply_resv_region)(struct device *dev, 205 struct iommu_domain *domain, 206 struct iommu_resv_region *region); 207 208 /* Window handling functions */ 209 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr, 210 phys_addr_t paddr, u64 size, int prot); 211 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr); 212 /* Set the number of windows per domain */ 213 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count); 214 /* Get the number of windows per domain */ 215 u32 (*domain_get_windows)(struct iommu_domain *domain); 216 217 int (*of_xlate)(struct device *dev, struct of_phandle_args *args); 218 219 unsigned long pgsize_bitmap; 220 }; 221 222 /** 223 * struct iommu_device - IOMMU core representation of one IOMMU hardware 224 * instance 225 * @list: Used by the iommu-core to keep a list of registered iommus 226 * @ops: iommu-ops for talking to this iommu 227 * @dev: struct device for sysfs handling 228 */ 229 struct iommu_device { 230 struct list_head list; 231 const struct iommu_ops *ops; 232 struct fwnode_handle *fwnode; 233 struct device dev; 234 }; 235 236 int iommu_device_register(struct iommu_device *iommu); 237 void iommu_device_unregister(struct iommu_device *iommu); 238 int iommu_device_sysfs_add(struct iommu_device *iommu, 239 struct device *parent, 240 const struct attribute_group **groups, 241 const char *fmt, ...) __printf(4, 5); 242 void iommu_device_sysfs_remove(struct iommu_device *iommu); 243 int iommu_device_link(struct iommu_device *iommu, struct device *link); 244 void iommu_device_unlink(struct iommu_device *iommu, struct device *link); 245 246 static inline void iommu_device_set_ops(struct iommu_device *iommu, 247 const struct iommu_ops *ops) 248 { 249 iommu->ops = ops; 250 } 251 252 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 253 struct fwnode_handle *fwnode) 254 { 255 iommu->fwnode = fwnode; 256 } 257 258 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */ 259 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */ 260 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */ 261 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */ 262 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */ 263 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */ 264 265 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops); 266 extern bool iommu_present(struct bus_type *bus); 267 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap); 268 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); 269 extern struct iommu_group *iommu_group_get_by_id(int id); 270 extern void iommu_domain_free(struct iommu_domain *domain); 271 extern int iommu_attach_device(struct iommu_domain *domain, 272 struct device *dev); 273 extern void iommu_detach_device(struct iommu_domain *domain, 274 struct device *dev); 275 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); 276 extern int iommu_map(struct iommu_domain *domain, unsigned long iova, 277 phys_addr_t paddr, size_t size, int prot); 278 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, 279 size_t size); 280 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, 281 struct scatterlist *sg,unsigned int nents, 282 int prot); 283 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova); 284 extern void iommu_set_fault_handler(struct iommu_domain *domain, 285 iommu_fault_handler_t handler, void *token); 286 287 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); 288 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list); 289 extern int iommu_request_dm_for_dev(struct device *dev); 290 extern struct iommu_resv_region * 291 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, int type); 292 extern int iommu_get_group_resv_regions(struct iommu_group *group, 293 struct list_head *head); 294 295 extern int iommu_attach_group(struct iommu_domain *domain, 296 struct iommu_group *group); 297 extern void iommu_detach_group(struct iommu_domain *domain, 298 struct iommu_group *group); 299 extern struct iommu_group *iommu_group_alloc(void); 300 extern void *iommu_group_get_iommudata(struct iommu_group *group); 301 extern void iommu_group_set_iommudata(struct iommu_group *group, 302 void *iommu_data, 303 void (*release)(void *iommu_data)); 304 extern int iommu_group_set_name(struct iommu_group *group, const char *name); 305 extern int iommu_group_add_device(struct iommu_group *group, 306 struct device *dev); 307 extern void iommu_group_remove_device(struct device *dev); 308 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data, 309 int (*fn)(struct device *, void *)); 310 extern struct iommu_group *iommu_group_get(struct device *dev); 311 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group); 312 extern void iommu_group_put(struct iommu_group *group); 313 extern int iommu_group_register_notifier(struct iommu_group *group, 314 struct notifier_block *nb); 315 extern int iommu_group_unregister_notifier(struct iommu_group *group, 316 struct notifier_block *nb); 317 extern int iommu_group_id(struct iommu_group *group); 318 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev); 319 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *); 320 321 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr, 322 void *data); 323 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr, 324 void *data); 325 326 /* Window handling function prototypes */ 327 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, 328 phys_addr_t offset, u64 size, 329 int prot); 330 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr); 331 /** 332 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework 333 * @domain: the iommu domain where the fault has happened 334 * @dev: the device where the fault has happened 335 * @iova: the faulting address 336 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) 337 * 338 * This function should be called by the low-level IOMMU implementations 339 * whenever IOMMU faults happen, to allow high-level users, that are 340 * interested in such events, to know about them. 341 * 342 * This event may be useful for several possible use cases: 343 * - mere logging of the event 344 * - dynamic TLB/PTE loading 345 * - if restarting of the faulting device is required 346 * 347 * Returns 0 on success and an appropriate error code otherwise (if dynamic 348 * PTE/TLB loading will one day be supported, implementations will be able 349 * to tell whether it succeeded or not according to this return value). 350 * 351 * Specifically, -ENOSYS is returned if a fault handler isn't installed 352 * (though fault handlers can also return -ENOSYS, in case they want to 353 * elicit the default behavior of the IOMMU drivers). 354 */ 355 static inline int report_iommu_fault(struct iommu_domain *domain, 356 struct device *dev, unsigned long iova, int flags) 357 { 358 int ret = -ENOSYS; 359 360 /* 361 * if upper layers showed interest and installed a fault handler, 362 * invoke it. 363 */ 364 if (domain->handler) 365 ret = domain->handler(domain, dev, iova, flags, 366 domain->handler_token); 367 368 trace_io_page_fault(dev, iova, flags); 369 return ret; 370 } 371 372 static inline size_t iommu_map_sg(struct iommu_domain *domain, 373 unsigned long iova, struct scatterlist *sg, 374 unsigned int nents, int prot) 375 { 376 return domain->ops->map_sg(domain, iova, sg, nents, prot); 377 } 378 379 /* PCI device grouping function */ 380 extern struct iommu_group *pci_device_group(struct device *dev); 381 /* Generic device grouping function */ 382 extern struct iommu_group *generic_device_group(struct device *dev); 383 384 /** 385 * struct iommu_fwspec - per-device IOMMU instance data 386 * @ops: ops for this device's IOMMU 387 * @iommu_fwnode: firmware handle for this device's IOMMU 388 * @iommu_priv: IOMMU driver private data for this device 389 * @num_ids: number of associated device IDs 390 * @ids: IDs which this device may present to the IOMMU 391 */ 392 struct iommu_fwspec { 393 const struct iommu_ops *ops; 394 struct fwnode_handle *iommu_fwnode; 395 void *iommu_priv; 396 unsigned int num_ids; 397 u32 ids[1]; 398 }; 399 400 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, 401 const struct iommu_ops *ops); 402 void iommu_fwspec_free(struct device *dev); 403 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids); 404 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode); 405 406 #else /* CONFIG_IOMMU_API */ 407 408 struct iommu_ops {}; 409 struct iommu_group {}; 410 struct iommu_fwspec {}; 411 struct iommu_device {}; 412 413 static inline bool iommu_present(struct bus_type *bus) 414 { 415 return false; 416 } 417 418 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) 419 { 420 return false; 421 } 422 423 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) 424 { 425 return NULL; 426 } 427 428 static inline struct iommu_group *iommu_group_get_by_id(int id) 429 { 430 return NULL; 431 } 432 433 static inline void iommu_domain_free(struct iommu_domain *domain) 434 { 435 } 436 437 static inline int iommu_attach_device(struct iommu_domain *domain, 438 struct device *dev) 439 { 440 return -ENODEV; 441 } 442 443 static inline void iommu_detach_device(struct iommu_domain *domain, 444 struct device *dev) 445 { 446 } 447 448 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) 449 { 450 return NULL; 451 } 452 453 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, 454 phys_addr_t paddr, int gfp_order, int prot) 455 { 456 return -ENODEV; 457 } 458 459 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova, 460 int gfp_order) 461 { 462 return -ENODEV; 463 } 464 465 static inline size_t iommu_map_sg(struct iommu_domain *domain, 466 unsigned long iova, struct scatterlist *sg, 467 unsigned int nents, int prot) 468 { 469 return -ENODEV; 470 } 471 472 static inline int iommu_domain_window_enable(struct iommu_domain *domain, 473 u32 wnd_nr, phys_addr_t paddr, 474 u64 size, int prot) 475 { 476 return -ENODEV; 477 } 478 479 static inline void iommu_domain_window_disable(struct iommu_domain *domain, 480 u32 wnd_nr) 481 { 482 } 483 484 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) 485 { 486 return 0; 487 } 488 489 static inline void iommu_set_fault_handler(struct iommu_domain *domain, 490 iommu_fault_handler_t handler, void *token) 491 { 492 } 493 494 static inline void iommu_get_resv_regions(struct device *dev, 495 struct list_head *list) 496 { 497 } 498 499 static inline void iommu_put_resv_regions(struct device *dev, 500 struct list_head *list) 501 { 502 } 503 504 static inline int iommu_get_group_resv_regions(struct iommu_group *group, 505 struct list_head *head) 506 { 507 return -ENODEV; 508 } 509 510 static inline int iommu_request_dm_for_dev(struct device *dev) 511 { 512 return -ENODEV; 513 } 514 515 static inline int iommu_attach_group(struct iommu_domain *domain, 516 struct iommu_group *group) 517 { 518 return -ENODEV; 519 } 520 521 static inline void iommu_detach_group(struct iommu_domain *domain, 522 struct iommu_group *group) 523 { 524 } 525 526 static inline struct iommu_group *iommu_group_alloc(void) 527 { 528 return ERR_PTR(-ENODEV); 529 } 530 531 static inline void *iommu_group_get_iommudata(struct iommu_group *group) 532 { 533 return NULL; 534 } 535 536 static inline void iommu_group_set_iommudata(struct iommu_group *group, 537 void *iommu_data, 538 void (*release)(void *iommu_data)) 539 { 540 } 541 542 static inline int iommu_group_set_name(struct iommu_group *group, 543 const char *name) 544 { 545 return -ENODEV; 546 } 547 548 static inline int iommu_group_add_device(struct iommu_group *group, 549 struct device *dev) 550 { 551 return -ENODEV; 552 } 553 554 static inline void iommu_group_remove_device(struct device *dev) 555 { 556 } 557 558 static inline int iommu_group_for_each_dev(struct iommu_group *group, 559 void *data, 560 int (*fn)(struct device *, void *)) 561 { 562 return -ENODEV; 563 } 564 565 static inline struct iommu_group *iommu_group_get(struct device *dev) 566 { 567 return NULL; 568 } 569 570 static inline void iommu_group_put(struct iommu_group *group) 571 { 572 } 573 574 static inline int iommu_group_register_notifier(struct iommu_group *group, 575 struct notifier_block *nb) 576 { 577 return -ENODEV; 578 } 579 580 static inline int iommu_group_unregister_notifier(struct iommu_group *group, 581 struct notifier_block *nb) 582 { 583 return 0; 584 } 585 586 static inline int iommu_group_id(struct iommu_group *group) 587 { 588 return -ENODEV; 589 } 590 591 static inline int iommu_domain_get_attr(struct iommu_domain *domain, 592 enum iommu_attr attr, void *data) 593 { 594 return -EINVAL; 595 } 596 597 static inline int iommu_domain_set_attr(struct iommu_domain *domain, 598 enum iommu_attr attr, void *data) 599 { 600 return -EINVAL; 601 } 602 603 static inline int iommu_device_register(struct iommu_device *iommu) 604 { 605 return -ENODEV; 606 } 607 608 static inline void iommu_device_set_ops(struct iommu_device *iommu, 609 const struct iommu_ops *ops) 610 { 611 } 612 613 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 614 struct fwnode_handle *fwnode) 615 { 616 } 617 618 static inline void iommu_device_unregister(struct iommu_device *iommu) 619 { 620 } 621 622 static inline int iommu_device_sysfs_add(struct iommu_device *iommu, 623 struct device *parent, 624 const struct attribute_group **groups, 625 const char *fmt, ...) 626 { 627 return -ENODEV; 628 } 629 630 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu) 631 { 632 } 633 634 static inline int iommu_device_link(struct device *dev, struct device *link) 635 { 636 return -EINVAL; 637 } 638 639 static inline void iommu_device_unlink(struct device *dev, struct device *link) 640 { 641 } 642 643 static inline int iommu_fwspec_init(struct device *dev, 644 struct fwnode_handle *iommu_fwnode, 645 const struct iommu_ops *ops) 646 { 647 return -ENODEV; 648 } 649 650 static inline void iommu_fwspec_free(struct device *dev) 651 { 652 } 653 654 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids, 655 int num_ids) 656 { 657 return -ENODEV; 658 } 659 660 static inline 661 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) 662 { 663 return NULL; 664 } 665 666 #endif /* CONFIG_IOMMU_API */ 667 668 #endif /* __LINUX_IOMMU_H */ 669