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/scatterlist.h> 23 #include <linux/device.h> 24 #include <linux/types.h> 25 #include <linux/errno.h> 26 #include <linux/err.h> 27 #include <linux/of.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 * Where the bus hardware includes a privilege level as part of its access type 36 * markings, and certain devices are capable of issuing transactions marked as 37 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other 38 * given permission flags only apply to accesses at the higher privilege level, 39 * and that unprivileged transactions should have as little access as possible. 40 * This would usually imply the same permissions as kernel mappings on the CPU, 41 * if the IOMMU page table format is equivalent. 42 */ 43 #define IOMMU_PRIV (1 << 5) 44 45 struct iommu_ops; 46 struct iommu_group; 47 struct bus_type; 48 struct device; 49 struct iommu_domain; 50 struct notifier_block; 51 52 /* iommu fault flags */ 53 #define IOMMU_FAULT_READ 0x0 54 #define IOMMU_FAULT_WRITE 0x1 55 56 typedef int (*iommu_fault_handler_t)(struct iommu_domain *, 57 struct device *, unsigned long, int, void *); 58 59 struct iommu_domain_geometry { 60 dma_addr_t aperture_start; /* First address that can be mapped */ 61 dma_addr_t aperture_end; /* Last address that can be mapped */ 62 bool force_aperture; /* DMA only allowed in mappable range? */ 63 }; 64 65 /* Domain feature flags */ 66 #define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */ 67 #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API 68 implementation */ 69 #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ 70 71 /* 72 * This are the possible domain-types 73 * 74 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate 75 * devices 76 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses 77 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used 78 * for VMs 79 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations. 80 * This flag allows IOMMU drivers to implement 81 * certain optimizations for these domains 82 */ 83 #define IOMMU_DOMAIN_BLOCKED (0U) 84 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT) 85 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING) 86 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \ 87 __IOMMU_DOMAIN_DMA_API) 88 89 struct iommu_domain { 90 unsigned type; 91 const struct iommu_ops *ops; 92 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */ 93 iommu_fault_handler_t handler; 94 void *handler_token; 95 struct iommu_domain_geometry geometry; 96 void *iova_cookie; 97 }; 98 99 enum iommu_cap { 100 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA 101 transactions */ 102 IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */ 103 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */ 104 }; 105 106 /* 107 * Following constraints are specifc to FSL_PAMUV1: 108 * -aperture must be power of 2, and naturally aligned 109 * -number of windows must be power of 2, and address space size 110 * of each window is determined by aperture size / # of windows 111 * -the actual size of the mapped region of a window must be power 112 * of 2 starting with 4KB and physical address must be naturally 113 * aligned. 114 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints. 115 * The caller can invoke iommu_domain_get_attr to check if the underlying 116 * iommu implementation supports these constraints. 117 */ 118 119 enum iommu_attr { 120 DOMAIN_ATTR_GEOMETRY, 121 DOMAIN_ATTR_PAGING, 122 DOMAIN_ATTR_WINDOWS, 123 DOMAIN_ATTR_FSL_PAMU_STASH, 124 DOMAIN_ATTR_FSL_PAMU_ENABLE, 125 DOMAIN_ATTR_FSL_PAMUV1, 126 DOMAIN_ATTR_NESTING, /* two stages of translation */ 127 DOMAIN_ATTR_MAX, 128 }; 129 130 /* These are the possible reserved region types */ 131 enum iommu_resv_type { 132 /* Memory regions which must be mapped 1:1 at all times */ 133 IOMMU_RESV_DIRECT, 134 /* Arbitrary "never map this or give it to a device" address ranges */ 135 IOMMU_RESV_RESERVED, 136 /* Hardware MSI region (untranslated) */ 137 IOMMU_RESV_MSI, 138 /* Software-managed MSI translation window */ 139 IOMMU_RESV_SW_MSI, 140 }; 141 142 /** 143 * struct iommu_resv_region - descriptor for a reserved memory region 144 * @list: Linked list pointers 145 * @start: System physical start address of the region 146 * @length: Length of the region in bytes 147 * @prot: IOMMU Protection flags (READ/WRITE/...) 148 * @type: Type of the reserved region 149 */ 150 struct iommu_resv_region { 151 struct list_head list; 152 phys_addr_t start; 153 size_t length; 154 int prot; 155 enum iommu_resv_type type; 156 }; 157 158 #ifdef CONFIG_IOMMU_API 159 160 /** 161 * struct iommu_ops - iommu ops and capabilities 162 * @capable: check capability 163 * @domain_alloc: allocate iommu domain 164 * @domain_free: free iommu domain 165 * @attach_dev: attach device to an iommu domain 166 * @detach_dev: detach device from an iommu domain 167 * @map: map a physically contiguous memory region to an iommu domain 168 * @unmap: unmap a physically contiguous memory region from an iommu domain 169 * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain 170 * @tlb_range_add: Add a given iova range to the flush queue for this domain 171 * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush 172 * queue 173 * @iova_to_phys: translate iova to physical address 174 * @add_device: add device to iommu grouping 175 * @remove_device: remove device from iommu grouping 176 * @device_group: find iommu group for a particular device 177 * @domain_get_attr: Query domain attributes 178 * @domain_set_attr: Change domain attributes 179 * @get_resv_regions: Request list of reserved regions for a device 180 * @put_resv_regions: Free list of reserved regions for a device 181 * @apply_resv_region: Temporary helper call-back for iova reserved ranges 182 * @domain_window_enable: Configure and enable a particular window for a domain 183 * @domain_window_disable: Disable a particular window for a domain 184 * @domain_set_windows: Set the number of windows for a domain 185 * @domain_get_windows: Return the number of windows for a domain 186 * @of_xlate: add OF master IDs to iommu grouping 187 * @pgsize_bitmap: bitmap of all possible supported page sizes 188 */ 189 struct iommu_ops { 190 bool (*capable)(enum iommu_cap); 191 192 /* Domain allocation and freeing by the iommu driver */ 193 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); 194 void (*domain_free)(struct iommu_domain *); 195 196 int (*attach_dev)(struct iommu_domain *domain, struct device *dev); 197 void (*detach_dev)(struct iommu_domain *domain, struct device *dev); 198 int (*map)(struct iommu_domain *domain, unsigned long iova, 199 phys_addr_t paddr, size_t size, int prot); 200 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, 201 size_t size); 202 void (*flush_iotlb_all)(struct iommu_domain *domain); 203 void (*iotlb_range_add)(struct iommu_domain *domain, 204 unsigned long iova, size_t size); 205 void (*iotlb_sync)(struct iommu_domain *domain); 206 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova); 207 int (*add_device)(struct device *dev); 208 void (*remove_device)(struct device *dev); 209 struct iommu_group *(*device_group)(struct device *dev); 210 int (*domain_get_attr)(struct iommu_domain *domain, 211 enum iommu_attr attr, void *data); 212 int (*domain_set_attr)(struct iommu_domain *domain, 213 enum iommu_attr attr, void *data); 214 215 /* Request/Free a list of reserved regions for a device */ 216 void (*get_resv_regions)(struct device *dev, struct list_head *list); 217 void (*put_resv_regions)(struct device *dev, struct list_head *list); 218 void (*apply_resv_region)(struct device *dev, 219 struct iommu_domain *domain, 220 struct iommu_resv_region *region); 221 222 /* Window handling functions */ 223 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr, 224 phys_addr_t paddr, u64 size, int prot); 225 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr); 226 /* Set the number of windows per domain */ 227 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count); 228 /* Get the number of windows per domain */ 229 u32 (*domain_get_windows)(struct iommu_domain *domain); 230 231 int (*of_xlate)(struct device *dev, struct of_phandle_args *args); 232 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev); 233 234 unsigned long pgsize_bitmap; 235 }; 236 237 /** 238 * struct iommu_device - IOMMU core representation of one IOMMU hardware 239 * instance 240 * @list: Used by the iommu-core to keep a list of registered iommus 241 * @ops: iommu-ops for talking to this iommu 242 * @dev: struct device for sysfs handling 243 */ 244 struct iommu_device { 245 struct list_head list; 246 const struct iommu_ops *ops; 247 struct fwnode_handle *fwnode; 248 struct device *dev; 249 }; 250 251 int iommu_device_register(struct iommu_device *iommu); 252 void iommu_device_unregister(struct iommu_device *iommu); 253 int iommu_device_sysfs_add(struct iommu_device *iommu, 254 struct device *parent, 255 const struct attribute_group **groups, 256 const char *fmt, ...) __printf(4, 5); 257 void iommu_device_sysfs_remove(struct iommu_device *iommu); 258 int iommu_device_link(struct iommu_device *iommu, struct device *link); 259 void iommu_device_unlink(struct iommu_device *iommu, struct device *link); 260 261 static inline void iommu_device_set_ops(struct iommu_device *iommu, 262 const struct iommu_ops *ops) 263 { 264 iommu->ops = ops; 265 } 266 267 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 268 struct fwnode_handle *fwnode) 269 { 270 iommu->fwnode = fwnode; 271 } 272 273 static inline struct iommu_device *dev_to_iommu_device(struct device *dev) 274 { 275 return (struct iommu_device *)dev_get_drvdata(dev); 276 } 277 278 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */ 279 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */ 280 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */ 281 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */ 282 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */ 283 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */ 284 285 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops); 286 extern bool iommu_present(struct bus_type *bus); 287 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap); 288 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); 289 extern struct iommu_group *iommu_group_get_by_id(int id); 290 extern void iommu_domain_free(struct iommu_domain *domain); 291 extern int iommu_attach_device(struct iommu_domain *domain, 292 struct device *dev); 293 extern void iommu_detach_device(struct iommu_domain *domain, 294 struct device *dev); 295 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); 296 extern int iommu_map(struct iommu_domain *domain, unsigned long iova, 297 phys_addr_t paddr, size_t size, int prot); 298 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, 299 size_t size); 300 extern size_t iommu_unmap_fast(struct iommu_domain *domain, 301 unsigned long iova, size_t size); 302 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, 303 struct scatterlist *sg,unsigned int nents, int prot); 304 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova); 305 extern void iommu_set_fault_handler(struct iommu_domain *domain, 306 iommu_fault_handler_t handler, void *token); 307 308 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); 309 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list); 310 extern int iommu_request_dm_for_dev(struct device *dev); 311 extern struct iommu_resv_region * 312 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, 313 enum iommu_resv_type type); 314 extern int iommu_get_group_resv_regions(struct iommu_group *group, 315 struct list_head *head); 316 317 extern int iommu_attach_group(struct iommu_domain *domain, 318 struct iommu_group *group); 319 extern void iommu_detach_group(struct iommu_domain *domain, 320 struct iommu_group *group); 321 extern struct iommu_group *iommu_group_alloc(void); 322 extern void *iommu_group_get_iommudata(struct iommu_group *group); 323 extern void iommu_group_set_iommudata(struct iommu_group *group, 324 void *iommu_data, 325 void (*release)(void *iommu_data)); 326 extern int iommu_group_set_name(struct iommu_group *group, const char *name); 327 extern int iommu_group_add_device(struct iommu_group *group, 328 struct device *dev); 329 extern void iommu_group_remove_device(struct device *dev); 330 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data, 331 int (*fn)(struct device *, void *)); 332 extern struct iommu_group *iommu_group_get(struct device *dev); 333 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group); 334 extern void iommu_group_put(struct iommu_group *group); 335 extern int iommu_group_register_notifier(struct iommu_group *group, 336 struct notifier_block *nb); 337 extern int iommu_group_unregister_notifier(struct iommu_group *group, 338 struct notifier_block *nb); 339 extern int iommu_group_id(struct iommu_group *group); 340 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev); 341 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *); 342 343 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr, 344 void *data); 345 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr, 346 void *data); 347 348 /* Window handling function prototypes */ 349 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, 350 phys_addr_t offset, u64 size, 351 int prot); 352 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr); 353 354 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev, 355 unsigned long iova, int flags); 356 357 static inline void iommu_flush_tlb_all(struct iommu_domain *domain) 358 { 359 if (domain->ops->flush_iotlb_all) 360 domain->ops->flush_iotlb_all(domain); 361 } 362 363 static inline void iommu_tlb_range_add(struct iommu_domain *domain, 364 unsigned long iova, size_t size) 365 { 366 if (domain->ops->iotlb_range_add) 367 domain->ops->iotlb_range_add(domain, iova, size); 368 } 369 370 static inline void iommu_tlb_sync(struct iommu_domain *domain) 371 { 372 if (domain->ops->iotlb_sync) 373 domain->ops->iotlb_sync(domain); 374 } 375 376 /* PCI device grouping function */ 377 extern struct iommu_group *pci_device_group(struct device *dev); 378 /* Generic device grouping function */ 379 extern struct iommu_group *generic_device_group(struct device *dev); 380 381 /** 382 * struct iommu_fwspec - per-device IOMMU instance data 383 * @ops: ops for this device's IOMMU 384 * @iommu_fwnode: firmware handle for this device's IOMMU 385 * @iommu_priv: IOMMU driver private data for this device 386 * @num_ids: number of associated device IDs 387 * @ids: IDs which this device may present to the IOMMU 388 */ 389 struct iommu_fwspec { 390 const struct iommu_ops *ops; 391 struct fwnode_handle *iommu_fwnode; 392 void *iommu_priv; 393 unsigned int num_ids; 394 u32 ids[1]; 395 }; 396 397 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, 398 const struct iommu_ops *ops); 399 void iommu_fwspec_free(struct device *dev); 400 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids); 401 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode); 402 403 #else /* CONFIG_IOMMU_API */ 404 405 struct iommu_ops {}; 406 struct iommu_group {}; 407 struct iommu_fwspec {}; 408 struct iommu_device {}; 409 410 static inline bool iommu_present(struct bus_type *bus) 411 { 412 return false; 413 } 414 415 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) 416 { 417 return false; 418 } 419 420 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) 421 { 422 return NULL; 423 } 424 425 static inline struct iommu_group *iommu_group_get_by_id(int id) 426 { 427 return NULL; 428 } 429 430 static inline void iommu_domain_free(struct iommu_domain *domain) 431 { 432 } 433 434 static inline int iommu_attach_device(struct iommu_domain *domain, 435 struct device *dev) 436 { 437 return -ENODEV; 438 } 439 440 static inline void iommu_detach_device(struct iommu_domain *domain, 441 struct device *dev) 442 { 443 } 444 445 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) 446 { 447 return NULL; 448 } 449 450 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, 451 phys_addr_t paddr, size_t size, int prot) 452 { 453 return -ENODEV; 454 } 455 456 static inline size_t iommu_unmap(struct iommu_domain *domain, 457 unsigned long iova, size_t size) 458 { 459 return 0; 460 } 461 462 static inline size_t iommu_unmap_fast(struct iommu_domain *domain, 463 unsigned long iova, int gfp_order) 464 { 465 return 0; 466 } 467 468 static inline size_t iommu_map_sg(struct iommu_domain *domain, 469 unsigned long iova, struct scatterlist *sg, 470 unsigned int nents, int prot) 471 { 472 return 0; 473 } 474 475 static inline void iommu_flush_tlb_all(struct iommu_domain *domain) 476 { 477 } 478 479 static inline void iommu_tlb_range_add(struct iommu_domain *domain, 480 unsigned long iova, size_t size) 481 { 482 } 483 484 static inline void iommu_tlb_sync(struct iommu_domain *domain) 485 { 486 } 487 488 static inline int iommu_domain_window_enable(struct iommu_domain *domain, 489 u32 wnd_nr, phys_addr_t paddr, 490 u64 size, int prot) 491 { 492 return -ENODEV; 493 } 494 495 static inline void iommu_domain_window_disable(struct iommu_domain *domain, 496 u32 wnd_nr) 497 { 498 } 499 500 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) 501 { 502 return 0; 503 } 504 505 static inline void iommu_set_fault_handler(struct iommu_domain *domain, 506 iommu_fault_handler_t handler, void *token) 507 { 508 } 509 510 static inline void iommu_get_resv_regions(struct device *dev, 511 struct list_head *list) 512 { 513 } 514 515 static inline void iommu_put_resv_regions(struct device *dev, 516 struct list_head *list) 517 { 518 } 519 520 static inline int iommu_get_group_resv_regions(struct iommu_group *group, 521 struct list_head *head) 522 { 523 return -ENODEV; 524 } 525 526 static inline int iommu_request_dm_for_dev(struct device *dev) 527 { 528 return -ENODEV; 529 } 530 531 static inline int iommu_attach_group(struct iommu_domain *domain, 532 struct iommu_group *group) 533 { 534 return -ENODEV; 535 } 536 537 static inline void iommu_detach_group(struct iommu_domain *domain, 538 struct iommu_group *group) 539 { 540 } 541 542 static inline struct iommu_group *iommu_group_alloc(void) 543 { 544 return ERR_PTR(-ENODEV); 545 } 546 547 static inline void *iommu_group_get_iommudata(struct iommu_group *group) 548 { 549 return NULL; 550 } 551 552 static inline void iommu_group_set_iommudata(struct iommu_group *group, 553 void *iommu_data, 554 void (*release)(void *iommu_data)) 555 { 556 } 557 558 static inline int iommu_group_set_name(struct iommu_group *group, 559 const char *name) 560 { 561 return -ENODEV; 562 } 563 564 static inline int iommu_group_add_device(struct iommu_group *group, 565 struct device *dev) 566 { 567 return -ENODEV; 568 } 569 570 static inline void iommu_group_remove_device(struct device *dev) 571 { 572 } 573 574 static inline int iommu_group_for_each_dev(struct iommu_group *group, 575 void *data, 576 int (*fn)(struct device *, void *)) 577 { 578 return -ENODEV; 579 } 580 581 static inline struct iommu_group *iommu_group_get(struct device *dev) 582 { 583 return NULL; 584 } 585 586 static inline void iommu_group_put(struct iommu_group *group) 587 { 588 } 589 590 static inline int iommu_group_register_notifier(struct iommu_group *group, 591 struct notifier_block *nb) 592 { 593 return -ENODEV; 594 } 595 596 static inline int iommu_group_unregister_notifier(struct iommu_group *group, 597 struct notifier_block *nb) 598 { 599 return 0; 600 } 601 602 static inline int iommu_group_id(struct iommu_group *group) 603 { 604 return -ENODEV; 605 } 606 607 static inline int iommu_domain_get_attr(struct iommu_domain *domain, 608 enum iommu_attr attr, void *data) 609 { 610 return -EINVAL; 611 } 612 613 static inline int iommu_domain_set_attr(struct iommu_domain *domain, 614 enum iommu_attr attr, void *data) 615 { 616 return -EINVAL; 617 } 618 619 static inline int iommu_device_register(struct iommu_device *iommu) 620 { 621 return -ENODEV; 622 } 623 624 static inline void iommu_device_set_ops(struct iommu_device *iommu, 625 const struct iommu_ops *ops) 626 { 627 } 628 629 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 630 struct fwnode_handle *fwnode) 631 { 632 } 633 634 static inline struct iommu_device *dev_to_iommu_device(struct device *dev) 635 { 636 return NULL; 637 } 638 639 static inline void iommu_device_unregister(struct iommu_device *iommu) 640 { 641 } 642 643 static inline int iommu_device_sysfs_add(struct iommu_device *iommu, 644 struct device *parent, 645 const struct attribute_group **groups, 646 const char *fmt, ...) 647 { 648 return -ENODEV; 649 } 650 651 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu) 652 { 653 } 654 655 static inline int iommu_device_link(struct device *dev, struct device *link) 656 { 657 return -EINVAL; 658 } 659 660 static inline void iommu_device_unlink(struct device *dev, struct device *link) 661 { 662 } 663 664 static inline int iommu_fwspec_init(struct device *dev, 665 struct fwnode_handle *iommu_fwnode, 666 const struct iommu_ops *ops) 667 { 668 return -ENODEV; 669 } 670 671 static inline void iommu_fwspec_free(struct device *dev) 672 { 673 } 674 675 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids, 676 int num_ids) 677 { 678 return -ENODEV; 679 } 680 681 static inline 682 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) 683 { 684 return NULL; 685 } 686 687 #endif /* CONFIG_IOMMU_API */ 688 689 #ifdef CONFIG_IOMMU_DEBUGFS 690 extern struct dentry *iommu_debugfs_dir; 691 void iommu_debugfs_setup(void); 692 #else 693 static inline void iommu_debugfs_setup(void) {} 694 #endif 695 696 #endif /* __LINUX_IOMMU_H */ 697