1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. 4 * Author: Joerg Roedel <[email protected]> 5 */ 6 7 #ifndef __LINUX_IOMMU_H 8 #define __LINUX_IOMMU_H 9 10 #include <linux/scatterlist.h> 11 #include <linux/device.h> 12 #include <linux/types.h> 13 #include <linux/errno.h> 14 #include <linux/err.h> 15 #include <linux/of.h> 16 #include <uapi/linux/iommu.h> 17 18 #define IOMMU_READ (1 << 0) 19 #define IOMMU_WRITE (1 << 1) 20 #define IOMMU_CACHE (1 << 2) /* DMA cache coherency */ 21 #define IOMMU_NOEXEC (1 << 3) 22 #define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */ 23 /* 24 * Where the bus hardware includes a privilege level as part of its access type 25 * markings, and certain devices are capable of issuing transactions marked as 26 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other 27 * given permission flags only apply to accesses at the higher privilege level, 28 * and that unprivileged transactions should have as little access as possible. 29 * This would usually imply the same permissions as kernel mappings on the CPU, 30 * if the IOMMU page table format is equivalent. 31 */ 32 #define IOMMU_PRIV (1 << 5) 33 /* 34 * Non-coherent masters on few Qualcomm SoCs can use this page protection flag 35 * to set correct cacheability attributes to use an outer level of cache - 36 * last level cache, aka system cache. 37 */ 38 #define IOMMU_QCOM_SYS_CACHE (1 << 6) 39 40 struct iommu_ops; 41 struct iommu_group; 42 struct bus_type; 43 struct device; 44 struct iommu_domain; 45 struct notifier_block; 46 struct iommu_sva; 47 struct iommu_fault_event; 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 typedef int (*iommu_mm_exit_handler_t)(struct device *dev, struct iommu_sva *, 56 void *); 57 typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, 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 /* 136 * Memory regions which are advertised to be 1:1 but are 137 * commonly considered relaxable in some conditions, 138 * for instance in device assignment use case (USB, Graphics) 139 */ 140 IOMMU_RESV_DIRECT_RELAXABLE, 141 /* Arbitrary "never map this or give it to a device" address ranges */ 142 IOMMU_RESV_RESERVED, 143 /* Hardware MSI region (untranslated) */ 144 IOMMU_RESV_MSI, 145 /* Software-managed MSI translation window */ 146 IOMMU_RESV_SW_MSI, 147 }; 148 149 /** 150 * struct iommu_resv_region - descriptor for a reserved memory region 151 * @list: Linked list pointers 152 * @start: System physical start address of the region 153 * @length: Length of the region in bytes 154 * @prot: IOMMU Protection flags (READ/WRITE/...) 155 * @type: Type of the reserved region 156 */ 157 struct iommu_resv_region { 158 struct list_head list; 159 phys_addr_t start; 160 size_t length; 161 int prot; 162 enum iommu_resv_type type; 163 }; 164 165 /* Per device IOMMU features */ 166 enum iommu_dev_features { 167 IOMMU_DEV_FEAT_AUX, /* Aux-domain feature */ 168 IOMMU_DEV_FEAT_SVA, /* Shared Virtual Addresses */ 169 }; 170 171 #define IOMMU_PASID_INVALID (-1U) 172 173 /** 174 * struct iommu_sva_ops - device driver callbacks for an SVA context 175 * 176 * @mm_exit: called when the mm is about to be torn down by exit_mmap. After 177 * @mm_exit returns, the device must not issue any more transaction 178 * with the PASID given as argument. 179 * 180 * The @mm_exit handler is allowed to sleep. Be careful about the 181 * locks taken in @mm_exit, because they might lead to deadlocks if 182 * they are also held when dropping references to the mm. Consider the 183 * following call chain: 184 * mutex_lock(A); mmput(mm) -> exit_mm() -> @mm_exit() -> mutex_lock(A) 185 * Using mmput_async() prevents this scenario. 186 * 187 */ 188 struct iommu_sva_ops { 189 iommu_mm_exit_handler_t mm_exit; 190 }; 191 192 #ifdef CONFIG_IOMMU_API 193 194 /** 195 * struct iommu_ops - iommu ops and capabilities 196 * @capable: check capability 197 * @domain_alloc: allocate iommu domain 198 * @domain_free: free iommu domain 199 * @attach_dev: attach device to an iommu domain 200 * @detach_dev: detach device from an iommu domain 201 * @map: map a physically contiguous memory region to an iommu domain 202 * @unmap: unmap a physically contiguous memory region from an iommu domain 203 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain 204 * @iotlb_range_add: Add a given iova range to the flush queue for this domain 205 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware 206 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush 207 * queue 208 * @iova_to_phys: translate iova to physical address 209 * @add_device: add device to iommu grouping 210 * @remove_device: remove device from iommu grouping 211 * @device_group: find iommu group for a particular device 212 * @domain_get_attr: Query domain attributes 213 * @domain_set_attr: Change domain attributes 214 * @get_resv_regions: Request list of reserved regions for a device 215 * @put_resv_regions: Free list of reserved regions for a device 216 * @apply_resv_region: Temporary helper call-back for iova reserved ranges 217 * @domain_window_enable: Configure and enable a particular window for a domain 218 * @domain_window_disable: Disable a particular window for a domain 219 * @of_xlate: add OF master IDs to iommu grouping 220 * @is_attach_deferred: Check if domain attach should be deferred from iommu 221 * driver init to device driver init (default no) 222 * @dev_has/enable/disable_feat: per device entries to check/enable/disable 223 * iommu specific features. 224 * @dev_feat_enabled: check enabled feature 225 * @aux_attach/detach_dev: aux-domain specific attach/detach entries. 226 * @aux_get_pasid: get the pasid given an aux-domain 227 * @sva_bind: Bind process address space to device 228 * @sva_unbind: Unbind process address space from device 229 * @sva_get_pasid: Get PASID associated to a SVA handle 230 * @page_response: handle page request response 231 * @pgsize_bitmap: bitmap of all possible supported page sizes 232 */ 233 struct iommu_ops { 234 bool (*capable)(enum iommu_cap); 235 236 /* Domain allocation and freeing by the iommu driver */ 237 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); 238 void (*domain_free)(struct iommu_domain *); 239 240 int (*attach_dev)(struct iommu_domain *domain, struct device *dev); 241 void (*detach_dev)(struct iommu_domain *domain, struct device *dev); 242 int (*map)(struct iommu_domain *domain, unsigned long iova, 243 phys_addr_t paddr, size_t size, int prot); 244 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, 245 size_t size); 246 void (*flush_iotlb_all)(struct iommu_domain *domain); 247 void (*iotlb_range_add)(struct iommu_domain *domain, 248 unsigned long iova, size_t size); 249 void (*iotlb_sync_map)(struct iommu_domain *domain); 250 void (*iotlb_sync)(struct iommu_domain *domain); 251 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova); 252 int (*add_device)(struct device *dev); 253 void (*remove_device)(struct device *dev); 254 struct iommu_group *(*device_group)(struct device *dev); 255 int (*domain_get_attr)(struct iommu_domain *domain, 256 enum iommu_attr attr, void *data); 257 int (*domain_set_attr)(struct iommu_domain *domain, 258 enum iommu_attr attr, void *data); 259 260 /* Request/Free a list of reserved regions for a device */ 261 void (*get_resv_regions)(struct device *dev, struct list_head *list); 262 void (*put_resv_regions)(struct device *dev, struct list_head *list); 263 void (*apply_resv_region)(struct device *dev, 264 struct iommu_domain *domain, 265 struct iommu_resv_region *region); 266 267 /* Window handling functions */ 268 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr, 269 phys_addr_t paddr, u64 size, int prot); 270 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr); 271 272 int (*of_xlate)(struct device *dev, struct of_phandle_args *args); 273 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev); 274 275 /* Per device IOMMU features */ 276 bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f); 277 bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f); 278 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f); 279 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f); 280 281 /* Aux-domain specific attach/detach entries */ 282 int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev); 283 void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev); 284 int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev); 285 286 struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm, 287 void *drvdata); 288 void (*sva_unbind)(struct iommu_sva *handle); 289 int (*sva_get_pasid)(struct iommu_sva *handle); 290 291 int (*page_response)(struct device *dev, 292 struct iommu_fault_event *evt, 293 struct iommu_page_response *msg); 294 295 unsigned long pgsize_bitmap; 296 }; 297 298 /** 299 * struct iommu_device - IOMMU core representation of one IOMMU hardware 300 * instance 301 * @list: Used by the iommu-core to keep a list of registered iommus 302 * @ops: iommu-ops for talking to this iommu 303 * @dev: struct device for sysfs handling 304 */ 305 struct iommu_device { 306 struct list_head list; 307 const struct iommu_ops *ops; 308 struct fwnode_handle *fwnode; 309 struct device *dev; 310 }; 311 312 /** 313 * struct iommu_fault_event - Generic fault event 314 * 315 * Can represent recoverable faults such as a page requests or 316 * unrecoverable faults such as DMA or IRQ remapping faults. 317 * 318 * @fault: fault descriptor 319 * @list: pending fault event list, used for tracking responses 320 */ 321 struct iommu_fault_event { 322 struct iommu_fault fault; 323 struct list_head list; 324 }; 325 326 /** 327 * struct iommu_fault_param - per-device IOMMU fault data 328 * @handler: Callback function to handle IOMMU faults at device level 329 * @data: handler private data 330 * @faults: holds the pending faults which needs response 331 * @lock: protect pending faults list 332 */ 333 struct iommu_fault_param { 334 iommu_dev_fault_handler_t handler; 335 void *data; 336 struct list_head faults; 337 struct mutex lock; 338 }; 339 340 /** 341 * struct iommu_param - collection of per-device IOMMU data 342 * 343 * @fault_param: IOMMU detected device fault reporting data 344 * 345 * TODO: migrate other per device data pointers under iommu_dev_data, e.g. 346 * struct iommu_group *iommu_group; 347 * struct iommu_fwspec *iommu_fwspec; 348 */ 349 struct iommu_param { 350 struct mutex lock; 351 struct iommu_fault_param *fault_param; 352 }; 353 354 int iommu_device_register(struct iommu_device *iommu); 355 void iommu_device_unregister(struct iommu_device *iommu); 356 int iommu_device_sysfs_add(struct iommu_device *iommu, 357 struct device *parent, 358 const struct attribute_group **groups, 359 const char *fmt, ...) __printf(4, 5); 360 void iommu_device_sysfs_remove(struct iommu_device *iommu); 361 int iommu_device_link(struct iommu_device *iommu, struct device *link); 362 void iommu_device_unlink(struct iommu_device *iommu, struct device *link); 363 364 static inline void iommu_device_set_ops(struct iommu_device *iommu, 365 const struct iommu_ops *ops) 366 { 367 iommu->ops = ops; 368 } 369 370 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 371 struct fwnode_handle *fwnode) 372 { 373 iommu->fwnode = fwnode; 374 } 375 376 static inline struct iommu_device *dev_to_iommu_device(struct device *dev) 377 { 378 return (struct iommu_device *)dev_get_drvdata(dev); 379 } 380 381 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */ 382 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */ 383 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */ 384 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */ 385 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */ 386 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */ 387 388 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops); 389 extern bool iommu_present(struct bus_type *bus); 390 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap); 391 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); 392 extern struct iommu_group *iommu_group_get_by_id(int id); 393 extern void iommu_domain_free(struct iommu_domain *domain); 394 extern int iommu_attach_device(struct iommu_domain *domain, 395 struct device *dev); 396 extern void iommu_detach_device(struct iommu_domain *domain, 397 struct device *dev); 398 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); 399 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); 400 extern int iommu_map(struct iommu_domain *domain, unsigned long iova, 401 phys_addr_t paddr, size_t size, int prot); 402 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, 403 size_t size); 404 extern size_t iommu_unmap_fast(struct iommu_domain *domain, 405 unsigned long iova, size_t size); 406 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, 407 struct scatterlist *sg,unsigned int nents, int prot); 408 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova); 409 extern void iommu_set_fault_handler(struct iommu_domain *domain, 410 iommu_fault_handler_t handler, void *token); 411 412 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); 413 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list); 414 extern int iommu_request_dm_for_dev(struct device *dev); 415 extern int iommu_request_dma_domain_for_dev(struct device *dev); 416 extern struct iommu_resv_region * 417 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, 418 enum iommu_resv_type type); 419 extern int iommu_get_group_resv_regions(struct iommu_group *group, 420 struct list_head *head); 421 422 extern int iommu_attach_group(struct iommu_domain *domain, 423 struct iommu_group *group); 424 extern void iommu_detach_group(struct iommu_domain *domain, 425 struct iommu_group *group); 426 extern struct iommu_group *iommu_group_alloc(void); 427 extern void *iommu_group_get_iommudata(struct iommu_group *group); 428 extern void iommu_group_set_iommudata(struct iommu_group *group, 429 void *iommu_data, 430 void (*release)(void *iommu_data)); 431 extern int iommu_group_set_name(struct iommu_group *group, const char *name); 432 extern int iommu_group_add_device(struct iommu_group *group, 433 struct device *dev); 434 extern void iommu_group_remove_device(struct device *dev); 435 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data, 436 int (*fn)(struct device *, void *)); 437 extern struct iommu_group *iommu_group_get(struct device *dev); 438 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group); 439 extern void iommu_group_put(struct iommu_group *group); 440 extern int iommu_group_register_notifier(struct iommu_group *group, 441 struct notifier_block *nb); 442 extern int iommu_group_unregister_notifier(struct iommu_group *group, 443 struct notifier_block *nb); 444 extern int iommu_register_device_fault_handler(struct device *dev, 445 iommu_dev_fault_handler_t handler, 446 void *data); 447 448 extern int iommu_unregister_device_fault_handler(struct device *dev); 449 450 extern int iommu_report_device_fault(struct device *dev, 451 struct iommu_fault_event *evt); 452 extern int iommu_page_response(struct device *dev, 453 struct iommu_page_response *msg); 454 455 extern int iommu_group_id(struct iommu_group *group); 456 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev); 457 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *); 458 459 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr, 460 void *data); 461 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr, 462 void *data); 463 464 /* Window handling function prototypes */ 465 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, 466 phys_addr_t offset, u64 size, 467 int prot); 468 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr); 469 470 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev, 471 unsigned long iova, int flags); 472 473 static inline void iommu_flush_tlb_all(struct iommu_domain *domain) 474 { 475 if (domain->ops->flush_iotlb_all) 476 domain->ops->flush_iotlb_all(domain); 477 } 478 479 static inline void iommu_tlb_range_add(struct iommu_domain *domain, 480 unsigned long iova, size_t size) 481 { 482 if (domain->ops->iotlb_range_add) 483 domain->ops->iotlb_range_add(domain, iova, size); 484 } 485 486 static inline void iommu_tlb_sync(struct iommu_domain *domain) 487 { 488 if (domain->ops->iotlb_sync) 489 domain->ops->iotlb_sync(domain); 490 } 491 492 /* PCI device grouping function */ 493 extern struct iommu_group *pci_device_group(struct device *dev); 494 /* Generic device grouping function */ 495 extern struct iommu_group *generic_device_group(struct device *dev); 496 /* FSL-MC device grouping function */ 497 struct iommu_group *fsl_mc_device_group(struct device *dev); 498 499 /** 500 * struct iommu_fwspec - per-device IOMMU instance data 501 * @ops: ops for this device's IOMMU 502 * @iommu_fwnode: firmware handle for this device's IOMMU 503 * @iommu_priv: IOMMU driver private data for this device 504 * @num_ids: number of associated device IDs 505 * @ids: IDs which this device may present to the IOMMU 506 */ 507 struct iommu_fwspec { 508 const struct iommu_ops *ops; 509 struct fwnode_handle *iommu_fwnode; 510 void *iommu_priv; 511 u32 flags; 512 unsigned int num_ids; 513 u32 ids[1]; 514 }; 515 516 /* ATS is supported */ 517 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0) 518 519 /** 520 * struct iommu_sva - handle to a device-mm bond 521 */ 522 struct iommu_sva { 523 struct device *dev; 524 const struct iommu_sva_ops *ops; 525 }; 526 527 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, 528 const struct iommu_ops *ops); 529 void iommu_fwspec_free(struct device *dev); 530 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids); 531 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode); 532 533 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) 534 { 535 return dev->iommu_fwspec; 536 } 537 538 static inline void dev_iommu_fwspec_set(struct device *dev, 539 struct iommu_fwspec *fwspec) 540 { 541 dev->iommu_fwspec = fwspec; 542 } 543 544 int iommu_probe_device(struct device *dev); 545 void iommu_release_device(struct device *dev); 546 547 bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f); 548 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f); 549 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f); 550 bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f); 551 int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev); 552 void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev); 553 int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev); 554 555 struct iommu_sva *iommu_sva_bind_device(struct device *dev, 556 struct mm_struct *mm, 557 void *drvdata); 558 void iommu_sva_unbind_device(struct iommu_sva *handle); 559 int iommu_sva_set_ops(struct iommu_sva *handle, 560 const struct iommu_sva_ops *ops); 561 int iommu_sva_get_pasid(struct iommu_sva *handle); 562 563 #else /* CONFIG_IOMMU_API */ 564 565 struct iommu_ops {}; 566 struct iommu_group {}; 567 struct iommu_fwspec {}; 568 struct iommu_device {}; 569 struct iommu_fault_param {}; 570 571 static inline bool iommu_present(struct bus_type *bus) 572 { 573 return false; 574 } 575 576 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) 577 { 578 return false; 579 } 580 581 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) 582 { 583 return NULL; 584 } 585 586 static inline struct iommu_group *iommu_group_get_by_id(int id) 587 { 588 return NULL; 589 } 590 591 static inline void iommu_domain_free(struct iommu_domain *domain) 592 { 593 } 594 595 static inline int iommu_attach_device(struct iommu_domain *domain, 596 struct device *dev) 597 { 598 return -ENODEV; 599 } 600 601 static inline void iommu_detach_device(struct iommu_domain *domain, 602 struct device *dev) 603 { 604 } 605 606 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) 607 { 608 return NULL; 609 } 610 611 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, 612 phys_addr_t paddr, size_t size, int prot) 613 { 614 return -ENODEV; 615 } 616 617 static inline size_t iommu_unmap(struct iommu_domain *domain, 618 unsigned long iova, size_t size) 619 { 620 return 0; 621 } 622 623 static inline size_t iommu_unmap_fast(struct iommu_domain *domain, 624 unsigned long iova, int gfp_order) 625 { 626 return 0; 627 } 628 629 static inline size_t iommu_map_sg(struct iommu_domain *domain, 630 unsigned long iova, struct scatterlist *sg, 631 unsigned int nents, int prot) 632 { 633 return 0; 634 } 635 636 static inline void iommu_flush_tlb_all(struct iommu_domain *domain) 637 { 638 } 639 640 static inline void iommu_tlb_range_add(struct iommu_domain *domain, 641 unsigned long iova, size_t size) 642 { 643 } 644 645 static inline void iommu_tlb_sync(struct iommu_domain *domain) 646 { 647 } 648 649 static inline int iommu_domain_window_enable(struct iommu_domain *domain, 650 u32 wnd_nr, phys_addr_t paddr, 651 u64 size, int prot) 652 { 653 return -ENODEV; 654 } 655 656 static inline void iommu_domain_window_disable(struct iommu_domain *domain, 657 u32 wnd_nr) 658 { 659 } 660 661 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) 662 { 663 return 0; 664 } 665 666 static inline void iommu_set_fault_handler(struct iommu_domain *domain, 667 iommu_fault_handler_t handler, void *token) 668 { 669 } 670 671 static inline void iommu_get_resv_regions(struct device *dev, 672 struct list_head *list) 673 { 674 } 675 676 static inline void iommu_put_resv_regions(struct device *dev, 677 struct list_head *list) 678 { 679 } 680 681 static inline int iommu_get_group_resv_regions(struct iommu_group *group, 682 struct list_head *head) 683 { 684 return -ENODEV; 685 } 686 687 static inline int iommu_request_dm_for_dev(struct device *dev) 688 { 689 return -ENODEV; 690 } 691 692 static inline int iommu_request_dma_domain_for_dev(struct device *dev) 693 { 694 return -ENODEV; 695 } 696 697 static inline int iommu_attach_group(struct iommu_domain *domain, 698 struct iommu_group *group) 699 { 700 return -ENODEV; 701 } 702 703 static inline void iommu_detach_group(struct iommu_domain *domain, 704 struct iommu_group *group) 705 { 706 } 707 708 static inline struct iommu_group *iommu_group_alloc(void) 709 { 710 return ERR_PTR(-ENODEV); 711 } 712 713 static inline void *iommu_group_get_iommudata(struct iommu_group *group) 714 { 715 return NULL; 716 } 717 718 static inline void iommu_group_set_iommudata(struct iommu_group *group, 719 void *iommu_data, 720 void (*release)(void *iommu_data)) 721 { 722 } 723 724 static inline int iommu_group_set_name(struct iommu_group *group, 725 const char *name) 726 { 727 return -ENODEV; 728 } 729 730 static inline int iommu_group_add_device(struct iommu_group *group, 731 struct device *dev) 732 { 733 return -ENODEV; 734 } 735 736 static inline void iommu_group_remove_device(struct device *dev) 737 { 738 } 739 740 static inline int iommu_group_for_each_dev(struct iommu_group *group, 741 void *data, 742 int (*fn)(struct device *, void *)) 743 { 744 return -ENODEV; 745 } 746 747 static inline struct iommu_group *iommu_group_get(struct device *dev) 748 { 749 return NULL; 750 } 751 752 static inline void iommu_group_put(struct iommu_group *group) 753 { 754 } 755 756 static inline int iommu_group_register_notifier(struct iommu_group *group, 757 struct notifier_block *nb) 758 { 759 return -ENODEV; 760 } 761 762 static inline int iommu_group_unregister_notifier(struct iommu_group *group, 763 struct notifier_block *nb) 764 { 765 return 0; 766 } 767 768 static inline 769 int iommu_register_device_fault_handler(struct device *dev, 770 iommu_dev_fault_handler_t handler, 771 void *data) 772 { 773 return -ENODEV; 774 } 775 776 static inline int iommu_unregister_device_fault_handler(struct device *dev) 777 { 778 return 0; 779 } 780 781 static inline 782 int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) 783 { 784 return -ENODEV; 785 } 786 787 static inline int iommu_page_response(struct device *dev, 788 struct iommu_page_response *msg) 789 { 790 return -ENODEV; 791 } 792 793 static inline int iommu_group_id(struct iommu_group *group) 794 { 795 return -ENODEV; 796 } 797 798 static inline int iommu_domain_get_attr(struct iommu_domain *domain, 799 enum iommu_attr attr, void *data) 800 { 801 return -EINVAL; 802 } 803 804 static inline int iommu_domain_set_attr(struct iommu_domain *domain, 805 enum iommu_attr attr, void *data) 806 { 807 return -EINVAL; 808 } 809 810 static inline int iommu_device_register(struct iommu_device *iommu) 811 { 812 return -ENODEV; 813 } 814 815 static inline void iommu_device_set_ops(struct iommu_device *iommu, 816 const struct iommu_ops *ops) 817 { 818 } 819 820 static inline void iommu_device_set_fwnode(struct iommu_device *iommu, 821 struct fwnode_handle *fwnode) 822 { 823 } 824 825 static inline struct iommu_device *dev_to_iommu_device(struct device *dev) 826 { 827 return NULL; 828 } 829 830 static inline void iommu_device_unregister(struct iommu_device *iommu) 831 { 832 } 833 834 static inline int iommu_device_sysfs_add(struct iommu_device *iommu, 835 struct device *parent, 836 const struct attribute_group **groups, 837 const char *fmt, ...) 838 { 839 return -ENODEV; 840 } 841 842 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu) 843 { 844 } 845 846 static inline int iommu_device_link(struct device *dev, struct device *link) 847 { 848 return -EINVAL; 849 } 850 851 static inline void iommu_device_unlink(struct device *dev, struct device *link) 852 { 853 } 854 855 static inline int iommu_fwspec_init(struct device *dev, 856 struct fwnode_handle *iommu_fwnode, 857 const struct iommu_ops *ops) 858 { 859 return -ENODEV; 860 } 861 862 static inline void iommu_fwspec_free(struct device *dev) 863 { 864 } 865 866 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids, 867 int num_ids) 868 { 869 return -ENODEV; 870 } 871 872 static inline 873 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) 874 { 875 return NULL; 876 } 877 878 static inline bool 879 iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat) 880 { 881 return false; 882 } 883 884 static inline bool 885 iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) 886 { 887 return false; 888 } 889 890 static inline int 891 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat) 892 { 893 return -ENODEV; 894 } 895 896 static inline int 897 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) 898 { 899 return -ENODEV; 900 } 901 902 static inline int 903 iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) 904 { 905 return -ENODEV; 906 } 907 908 static inline void 909 iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) 910 { 911 } 912 913 static inline int 914 iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) 915 { 916 return -ENODEV; 917 } 918 919 static inline struct iommu_sva * 920 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) 921 { 922 return NULL; 923 } 924 925 static inline void iommu_sva_unbind_device(struct iommu_sva *handle) 926 { 927 } 928 929 static inline int iommu_sva_set_ops(struct iommu_sva *handle, 930 const struct iommu_sva_ops *ops) 931 { 932 return -EINVAL; 933 } 934 935 static inline int iommu_sva_get_pasid(struct iommu_sva *handle) 936 { 937 return IOMMU_PASID_INVALID; 938 } 939 940 #endif /* CONFIG_IOMMU_API */ 941 942 #ifdef CONFIG_IOMMU_DEBUGFS 943 extern struct dentry *iommu_debugfs_dir; 944 void iommu_debugfs_setup(void); 945 #else 946 static inline void iommu_debugfs_setup(void) {} 947 #endif 948 949 #endif /* __LINUX_IOMMU_H */ 950