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_DMA_USE_FLUSH_QUEUE, 128 DOMAIN_ATTR_MAX, 129 }; 130 131 /* These are the possible reserved region types */ 132 enum iommu_resv_type { 133 /* Memory regions which must be mapped 1:1 at all times */ 134 IOMMU_RESV_DIRECT, 135 /* Arbitrary "never map this or give it to a device" address ranges */ 136 IOMMU_RESV_RESERVED, 137 /* Hardware MSI region (untranslated) */ 138 IOMMU_RESV_MSI, 139 /* Software-managed MSI translation window */ 140 IOMMU_RESV_SW_MSI, 141 }; 142 143 /** 144 * struct iommu_resv_region - descriptor for a reserved memory region 145 * @list: Linked list pointers 146 * @start: System physical start address of the region 147 * @length: Length of the region in bytes 148 * @prot: IOMMU Protection flags (READ/WRITE/...) 149 * @type: Type of the reserved region 150 */ 151 struct iommu_resv_region { 152 struct list_head list; 153 phys_addr_t start; 154 size_t length; 155 int prot; 156 enum iommu_resv_type type; 157 }; 158 159 #ifdef CONFIG_IOMMU_API 160 161 /** 162 * struct iommu_ops - iommu ops and capabilities 163 * @capable: check capability 164 * @domain_alloc: allocate iommu domain 165 * @domain_free: free iommu domain 166 * @attach_dev: attach device to an iommu domain 167 * @detach_dev: detach device from an iommu domain 168 * @map: map a physically contiguous memory region to an iommu domain 169 * @unmap: unmap a physically contiguous memory region from an iommu domain 170 * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain 171 * @tlb_range_add: Add a given iova range to the flush queue for this domain 172 * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush 173 * queue 174 * @iova_to_phys: translate iova to physical address 175 * @add_device: add device to iommu grouping 176 * @remove_device: remove device from iommu grouping 177 * @device_group: find iommu group for a particular device 178 * @domain_get_attr: Query domain attributes 179 * @domain_set_attr: Change domain attributes 180 * @get_resv_regions: Request list of reserved regions for a device 181 * @put_resv_regions: Free list of reserved regions for a device 182 * @apply_resv_region: Temporary helper call-back for iova reserved ranges 183 * @domain_window_enable: Configure and enable a particular window for a domain 184 * @domain_window_disable: Disable a particular window for a domain 185 * @of_xlate: add OF master IDs to iommu grouping 186 * @pgsize_bitmap: bitmap of all possible supported page sizes 187 */ 188 struct iommu_ops { 189 bool (*capable)(enum iommu_cap); 190 191 /* Domain allocation and freeing by the iommu driver */ 192 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); 193 void (*domain_free)(struct iommu_domain *); 194 195 int (*attach_dev)(struct iommu_domain *domain, struct device *dev); 196 void (*detach_dev)(struct iommu_domain *domain, struct device *dev); 197 int (*map)(struct iommu_domain *domain, unsigned long iova, 198 phys_addr_t paddr, size_t size, int prot); 199 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, 200 size_t size); 201 void (*flush_iotlb_all)(struct iommu_domain *domain); 202 void (*iotlb_range_add)(struct iommu_domain *domain, 203 unsigned long iova, size_t size); 204 void (*iotlb_sync)(struct iommu_domain *domain); 205 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova); 206 int (*add_device)(struct device *dev); 207 void (*remove_device)(struct device *dev); 208 struct iommu_group *(*device_group)(struct device *dev); 209 int (*domain_get_attr)(struct iommu_domain *domain, 210 enum iommu_attr attr, void *data); 211 int (*domain_set_attr)(struct iommu_domain *domain, 212 enum iommu_attr attr, void *data); 213 214 /* Request/Free a list of reserved regions for a device */ 215 void (*get_resv_regions)(struct device *dev, struct list_head *list); 216 void (*put_resv_regions)(struct device *dev, struct list_head *list); 217 void (*apply_resv_region)(struct device *dev, 218 struct iommu_domain *domain, 219 struct iommu_resv_region *region); 220 221 /* Window handling functions */ 222 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr, 223 phys_addr_t paddr, u64 size, int prot); 224 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr); 225 226 int (*of_xlate)(struct device *dev, struct of_phandle_args *args); 227 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev); 228 229 unsigned long pgsize_bitmap; 230 }; 231 232 /** 233 * struct iommu_device - IOMMU core representation of one IOMMU hardware 234 * instance 235 * @list: Used by the iommu-core to keep a list of registered iommus 236 * @ops: iommu-ops for talking to this iommu 237 * @dev: struct device for sysfs handling 238 */ 239 struct iommu_device { 240 struct list_head list; 241 const struct iommu_ops *ops; 242 struct fwnode_handle *fwnode; 243 struct device *dev; 244 }; 245 246 int iommu_device_register(struct iommu_device *iommu); 247 void iommu_device_unregister(struct iommu_device *iommu); 248 int iommu_device_sysfs_add(struct iommu_device *iommu, 249 struct device *parent, 250 const struct attribute_group **groups, 251 const char *fmt, ...) __printf(4, 5); 252 void iommu_device_sysfs_remove(struct iommu_device *iommu); 253 int iommu_device_link(struct iommu_device *iommu, struct device *link); 254 void iommu_device_unlink(struct iommu_device *iommu, struct device *link); 255 256 static inline void iommu_device_set_ops(struct iommu_device *iommu, 257 const struct iommu_ops *ops) 258 { 259 iommu->ops = ops; 260 } 261 262 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 263 struct fwnode_handle *fwnode) 264 { 265 iommu->fwnode = fwnode; 266 } 267 268 static inline struct iommu_device *dev_to_iommu_device(struct device *dev) 269 { 270 return (struct iommu_device *)dev_get_drvdata(dev); 271 } 272 273 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */ 274 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */ 275 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */ 276 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */ 277 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */ 278 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */ 279 280 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops); 281 extern bool iommu_present(struct bus_type *bus); 282 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap); 283 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); 284 extern struct iommu_group *iommu_group_get_by_id(int id); 285 extern void iommu_domain_free(struct iommu_domain *domain); 286 extern int iommu_attach_device(struct iommu_domain *domain, 287 struct device *dev); 288 extern void iommu_detach_device(struct iommu_domain *domain, 289 struct device *dev); 290 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); 291 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); 292 extern int iommu_map(struct iommu_domain *domain, unsigned long iova, 293 phys_addr_t paddr, size_t size, int prot); 294 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, 295 size_t size); 296 extern size_t iommu_unmap_fast(struct iommu_domain *domain, 297 unsigned long iova, size_t size); 298 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, 299 struct scatterlist *sg,unsigned int nents, int prot); 300 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova); 301 extern void iommu_set_fault_handler(struct iommu_domain *domain, 302 iommu_fault_handler_t handler, void *token); 303 304 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); 305 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list); 306 extern int iommu_request_dm_for_dev(struct device *dev); 307 extern struct iommu_resv_region * 308 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, 309 enum iommu_resv_type type); 310 extern int iommu_get_group_resv_regions(struct iommu_group *group, 311 struct list_head *head); 312 313 extern int iommu_attach_group(struct iommu_domain *domain, 314 struct iommu_group *group); 315 extern void iommu_detach_group(struct iommu_domain *domain, 316 struct iommu_group *group); 317 extern struct iommu_group *iommu_group_alloc(void); 318 extern void *iommu_group_get_iommudata(struct iommu_group *group); 319 extern void iommu_group_set_iommudata(struct iommu_group *group, 320 void *iommu_data, 321 void (*release)(void *iommu_data)); 322 extern int iommu_group_set_name(struct iommu_group *group, const char *name); 323 extern int iommu_group_add_device(struct iommu_group *group, 324 struct device *dev); 325 extern void iommu_group_remove_device(struct device *dev); 326 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data, 327 int (*fn)(struct device *, void *)); 328 extern struct iommu_group *iommu_group_get(struct device *dev); 329 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group); 330 extern void iommu_group_put(struct iommu_group *group); 331 extern int iommu_group_register_notifier(struct iommu_group *group, 332 struct notifier_block *nb); 333 extern int iommu_group_unregister_notifier(struct iommu_group *group, 334 struct notifier_block *nb); 335 extern int iommu_group_id(struct iommu_group *group); 336 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev); 337 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *); 338 339 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr, 340 void *data); 341 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr, 342 void *data); 343 344 /* Window handling function prototypes */ 345 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, 346 phys_addr_t offset, u64 size, 347 int prot); 348 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr); 349 350 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev, 351 unsigned long iova, int flags); 352 353 static inline void iommu_flush_tlb_all(struct iommu_domain *domain) 354 { 355 if (domain->ops->flush_iotlb_all) 356 domain->ops->flush_iotlb_all(domain); 357 } 358 359 static inline void iommu_tlb_range_add(struct iommu_domain *domain, 360 unsigned long iova, size_t size) 361 { 362 if (domain->ops->iotlb_range_add) 363 domain->ops->iotlb_range_add(domain, iova, size); 364 } 365 366 static inline void iommu_tlb_sync(struct iommu_domain *domain) 367 { 368 if (domain->ops->iotlb_sync) 369 domain->ops->iotlb_sync(domain); 370 } 371 372 /* PCI device grouping function */ 373 extern struct iommu_group *pci_device_group(struct device *dev); 374 /* Generic device grouping function */ 375 extern struct iommu_group *generic_device_group(struct device *dev); 376 /* FSL-MC device grouping function */ 377 struct iommu_group *fsl_mc_device_group(struct device *dev); 378 379 /** 380 * struct iommu_fwspec - per-device IOMMU instance data 381 * @ops: ops for this device's IOMMU 382 * @iommu_fwnode: firmware handle for this device's IOMMU 383 * @iommu_priv: IOMMU driver private data for this device 384 * @num_ids: number of associated device IDs 385 * @ids: IDs which this device may present to the IOMMU 386 */ 387 struct iommu_fwspec { 388 const struct iommu_ops *ops; 389 struct fwnode_handle *iommu_fwnode; 390 void *iommu_priv; 391 unsigned int num_ids; 392 u32 ids[1]; 393 }; 394 395 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, 396 const struct iommu_ops *ops); 397 void iommu_fwspec_free(struct device *dev); 398 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids); 399 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode); 400 401 #else /* CONFIG_IOMMU_API */ 402 403 struct iommu_ops {}; 404 struct iommu_group {}; 405 struct iommu_fwspec {}; 406 struct iommu_device {}; 407 408 static inline bool iommu_present(struct bus_type *bus) 409 { 410 return false; 411 } 412 413 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) 414 { 415 return false; 416 } 417 418 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) 419 { 420 return NULL; 421 } 422 423 static inline struct iommu_group *iommu_group_get_by_id(int id) 424 { 425 return NULL; 426 } 427 428 static inline void iommu_domain_free(struct iommu_domain *domain) 429 { 430 } 431 432 static inline int iommu_attach_device(struct iommu_domain *domain, 433 struct device *dev) 434 { 435 return -ENODEV; 436 } 437 438 static inline void iommu_detach_device(struct iommu_domain *domain, 439 struct device *dev) 440 { 441 } 442 443 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) 444 { 445 return NULL; 446 } 447 448 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, 449 phys_addr_t paddr, size_t size, int prot) 450 { 451 return -ENODEV; 452 } 453 454 static inline size_t iommu_unmap(struct iommu_domain *domain, 455 unsigned long iova, size_t size) 456 { 457 return 0; 458 } 459 460 static inline size_t iommu_unmap_fast(struct iommu_domain *domain, 461 unsigned long iova, int gfp_order) 462 { 463 return 0; 464 } 465 466 static inline size_t iommu_map_sg(struct iommu_domain *domain, 467 unsigned long iova, struct scatterlist *sg, 468 unsigned int nents, int prot) 469 { 470 return 0; 471 } 472 473 static inline void iommu_flush_tlb_all(struct iommu_domain *domain) 474 { 475 } 476 477 static inline void iommu_tlb_range_add(struct iommu_domain *domain, 478 unsigned long iova, size_t size) 479 { 480 } 481 482 static inline void iommu_tlb_sync(struct iommu_domain *domain) 483 { 484 } 485 486 static inline int iommu_domain_window_enable(struct iommu_domain *domain, 487 u32 wnd_nr, phys_addr_t paddr, 488 u64 size, int prot) 489 { 490 return -ENODEV; 491 } 492 493 static inline void iommu_domain_window_disable(struct iommu_domain *domain, 494 u32 wnd_nr) 495 { 496 } 497 498 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) 499 { 500 return 0; 501 } 502 503 static inline void iommu_set_fault_handler(struct iommu_domain *domain, 504 iommu_fault_handler_t handler, void *token) 505 { 506 } 507 508 static inline void iommu_get_resv_regions(struct device *dev, 509 struct list_head *list) 510 { 511 } 512 513 static inline void iommu_put_resv_regions(struct device *dev, 514 struct list_head *list) 515 { 516 } 517 518 static inline int iommu_get_group_resv_regions(struct iommu_group *group, 519 struct list_head *head) 520 { 521 return -ENODEV; 522 } 523 524 static inline int iommu_request_dm_for_dev(struct device *dev) 525 { 526 return -ENODEV; 527 } 528 529 static inline int iommu_attach_group(struct iommu_domain *domain, 530 struct iommu_group *group) 531 { 532 return -ENODEV; 533 } 534 535 static inline void iommu_detach_group(struct iommu_domain *domain, 536 struct iommu_group *group) 537 { 538 } 539 540 static inline struct iommu_group *iommu_group_alloc(void) 541 { 542 return ERR_PTR(-ENODEV); 543 } 544 545 static inline void *iommu_group_get_iommudata(struct iommu_group *group) 546 { 547 return NULL; 548 } 549 550 static inline void iommu_group_set_iommudata(struct iommu_group *group, 551 void *iommu_data, 552 void (*release)(void *iommu_data)) 553 { 554 } 555 556 static inline int iommu_group_set_name(struct iommu_group *group, 557 const char *name) 558 { 559 return -ENODEV; 560 } 561 562 static inline int iommu_group_add_device(struct iommu_group *group, 563 struct device *dev) 564 { 565 return -ENODEV; 566 } 567 568 static inline void iommu_group_remove_device(struct device *dev) 569 { 570 } 571 572 static inline int iommu_group_for_each_dev(struct iommu_group *group, 573 void *data, 574 int (*fn)(struct device *, void *)) 575 { 576 return -ENODEV; 577 } 578 579 static inline struct iommu_group *iommu_group_get(struct device *dev) 580 { 581 return NULL; 582 } 583 584 static inline void iommu_group_put(struct iommu_group *group) 585 { 586 } 587 588 static inline int iommu_group_register_notifier(struct iommu_group *group, 589 struct notifier_block *nb) 590 { 591 return -ENODEV; 592 } 593 594 static inline int iommu_group_unregister_notifier(struct iommu_group *group, 595 struct notifier_block *nb) 596 { 597 return 0; 598 } 599 600 static inline int iommu_group_id(struct iommu_group *group) 601 { 602 return -ENODEV; 603 } 604 605 static inline int iommu_domain_get_attr(struct iommu_domain *domain, 606 enum iommu_attr attr, void *data) 607 { 608 return -EINVAL; 609 } 610 611 static inline int iommu_domain_set_attr(struct iommu_domain *domain, 612 enum iommu_attr attr, void *data) 613 { 614 return -EINVAL; 615 } 616 617 static inline int iommu_device_register(struct iommu_device *iommu) 618 { 619 return -ENODEV; 620 } 621 622 static inline void iommu_device_set_ops(struct iommu_device *iommu, 623 const struct iommu_ops *ops) 624 { 625 } 626 627 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 628 struct fwnode_handle *fwnode) 629 { 630 } 631 632 static inline struct iommu_device *dev_to_iommu_device(struct device *dev) 633 { 634 return NULL; 635 } 636 637 static inline void iommu_device_unregister(struct iommu_device *iommu) 638 { 639 } 640 641 static inline int iommu_device_sysfs_add(struct iommu_device *iommu, 642 struct device *parent, 643 const struct attribute_group **groups, 644 const char *fmt, ...) 645 { 646 return -ENODEV; 647 } 648 649 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu) 650 { 651 } 652 653 static inline int iommu_device_link(struct device *dev, struct device *link) 654 { 655 return -EINVAL; 656 } 657 658 static inline void iommu_device_unlink(struct device *dev, struct device *link) 659 { 660 } 661 662 static inline int iommu_fwspec_init(struct device *dev, 663 struct fwnode_handle *iommu_fwnode, 664 const struct iommu_ops *ops) 665 { 666 return -ENODEV; 667 } 668 669 static inline void iommu_fwspec_free(struct device *dev) 670 { 671 } 672 673 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids, 674 int num_ids) 675 { 676 return -ENODEV; 677 } 678 679 static inline 680 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) 681 { 682 return NULL; 683 } 684 685 #endif /* CONFIG_IOMMU_API */ 686 687 #ifdef CONFIG_IOMMU_DEBUGFS 688 extern struct dentry *iommu_debugfs_dir; 689 void iommu_debugfs_setup(void); 690 #else 691 static inline void iommu_debugfs_setup(void) {} 692 #endif 693 694 #endif /* __LINUX_IOMMU_H */ 695