v4.19.13 snapshot.
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
new file mode 100644
index 0000000..87994c2
--- /dev/null
+++ b/include/linux/iommu.h
@@ -0,0 +1,696 @@
+/*
+ * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
+ * Author: Joerg Roedel <joerg.roedel@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __LINUX_IOMMU_H
+#define __LINUX_IOMMU_H
+
+#include <linux/scatterlist.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/of.h>
+
+#define IOMMU_READ (1 << 0)
+#define IOMMU_WRITE (1 << 1)
+#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
+#define IOMMU_NOEXEC (1 << 3)
+#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
+/*
+ * Where the bus hardware includes a privilege level as part of its access type
+ * markings, and certain devices are capable of issuing transactions marked as
+ * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
+ * given permission flags only apply to accesses at the higher privilege level,
+ * and that unprivileged transactions should have as little access as possible.
+ * This would usually imply the same permissions as kernel mappings on the CPU,
+ * if the IOMMU page table format is equivalent.
+ */
+#define IOMMU_PRIV (1 << 5)
+
+struct iommu_ops;
+struct iommu_group;
+struct bus_type;
+struct device;
+struct iommu_domain;
+struct notifier_block;
+
+/* iommu fault flags */
+#define IOMMU_FAULT_READ 0x0
+#define IOMMU_FAULT_WRITE 0x1
+
+typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
+ struct device *, unsigned long, int, void *);
+
+struct iommu_domain_geometry {
+ dma_addr_t aperture_start; /* First address that can be mapped */
+ dma_addr_t aperture_end; /* Last address that can be mapped */
+ bool force_aperture; /* DMA only allowed in mappable range? */
+};
+
+/* Domain feature flags */
+#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
+#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
+ implementation */
+#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
+
+/*
+ * This are the possible domain-types
+ *
+ * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
+ * devices
+ * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
+ * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
+ * for VMs
+ * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
+ * This flag allows IOMMU drivers to implement
+ * certain optimizations for these domains
+ */
+#define IOMMU_DOMAIN_BLOCKED (0U)
+#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
+#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
+#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
+ __IOMMU_DOMAIN_DMA_API)
+
+struct iommu_domain {
+ unsigned type;
+ const struct iommu_ops *ops;
+ unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
+ iommu_fault_handler_t handler;
+ void *handler_token;
+ struct iommu_domain_geometry geometry;
+ void *iova_cookie;
+};
+
+enum iommu_cap {
+ IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
+ transactions */
+ IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
+ IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
+};
+
+/*
+ * Following constraints are specifc to FSL_PAMUV1:
+ * -aperture must be power of 2, and naturally aligned
+ * -number of windows must be power of 2, and address space size
+ * of each window is determined by aperture size / # of windows
+ * -the actual size of the mapped region of a window must be power
+ * of 2 starting with 4KB and physical address must be naturally
+ * aligned.
+ * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
+ * The caller can invoke iommu_domain_get_attr to check if the underlying
+ * iommu implementation supports these constraints.
+ */
+
+enum iommu_attr {
+ DOMAIN_ATTR_GEOMETRY,
+ DOMAIN_ATTR_PAGING,
+ DOMAIN_ATTR_WINDOWS,
+ DOMAIN_ATTR_FSL_PAMU_STASH,
+ DOMAIN_ATTR_FSL_PAMU_ENABLE,
+ DOMAIN_ATTR_FSL_PAMUV1,
+ DOMAIN_ATTR_NESTING, /* two stages of translation */
+ DOMAIN_ATTR_MAX,
+};
+
+/* These are the possible reserved region types */
+enum iommu_resv_type {
+ /* Memory regions which must be mapped 1:1 at all times */
+ IOMMU_RESV_DIRECT,
+ /* Arbitrary "never map this or give it to a device" address ranges */
+ IOMMU_RESV_RESERVED,
+ /* Hardware MSI region (untranslated) */
+ IOMMU_RESV_MSI,
+ /* Software-managed MSI translation window */
+ IOMMU_RESV_SW_MSI,
+};
+
+/**
+ * struct iommu_resv_region - descriptor for a reserved memory region
+ * @list: Linked list pointers
+ * @start: System physical start address of the region
+ * @length: Length of the region in bytes
+ * @prot: IOMMU Protection flags (READ/WRITE/...)
+ * @type: Type of the reserved region
+ */
+struct iommu_resv_region {
+ struct list_head list;
+ phys_addr_t start;
+ size_t length;
+ int prot;
+ enum iommu_resv_type type;
+};
+
+#ifdef CONFIG_IOMMU_API
+
+/**
+ * struct iommu_ops - iommu ops and capabilities
+ * @capable: check capability
+ * @domain_alloc: allocate iommu domain
+ * @domain_free: free iommu domain
+ * @attach_dev: attach device to an iommu domain
+ * @detach_dev: detach device from an iommu domain
+ * @map: map a physically contiguous memory region to an iommu domain
+ * @unmap: unmap a physically contiguous memory region from an iommu domain
+ * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain
+ * @tlb_range_add: Add a given iova range to the flush queue for this domain
+ * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
+ * queue
+ * @iova_to_phys: translate iova to physical address
+ * @add_device: add device to iommu grouping
+ * @remove_device: remove device from iommu grouping
+ * @device_group: find iommu group for a particular device
+ * @domain_get_attr: Query domain attributes
+ * @domain_set_attr: Change domain attributes
+ * @get_resv_regions: Request list of reserved regions for a device
+ * @put_resv_regions: Free list of reserved regions for a device
+ * @apply_resv_region: Temporary helper call-back for iova reserved ranges
+ * @domain_window_enable: Configure and enable a particular window for a domain
+ * @domain_window_disable: Disable a particular window for a domain
+ * @domain_set_windows: Set the number of windows for a domain
+ * @domain_get_windows: Return the number of windows for a domain
+ * @of_xlate: add OF master IDs to iommu grouping
+ * @pgsize_bitmap: bitmap of all possible supported page sizes
+ */
+struct iommu_ops {
+ bool (*capable)(enum iommu_cap);
+
+ /* Domain allocation and freeing by the iommu driver */
+ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
+ void (*domain_free)(struct iommu_domain *);
+
+ int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
+ void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
+ int (*map)(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot);
+ size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
+ size_t size);
+ void (*flush_iotlb_all)(struct iommu_domain *domain);
+ void (*iotlb_range_add)(struct iommu_domain *domain,
+ unsigned long iova, size_t size);
+ void (*iotlb_sync)(struct iommu_domain *domain);
+ phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
+ int (*add_device)(struct device *dev);
+ void (*remove_device)(struct device *dev);
+ struct iommu_group *(*device_group)(struct device *dev);
+ int (*domain_get_attr)(struct iommu_domain *domain,
+ enum iommu_attr attr, void *data);
+ int (*domain_set_attr)(struct iommu_domain *domain,
+ enum iommu_attr attr, void *data);
+
+ /* Request/Free a list of reserved regions for a device */
+ void (*get_resv_regions)(struct device *dev, struct list_head *list);
+ void (*put_resv_regions)(struct device *dev, struct list_head *list);
+ void (*apply_resv_region)(struct device *dev,
+ struct iommu_domain *domain,
+ struct iommu_resv_region *region);
+
+ /* Window handling functions */
+ int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
+ phys_addr_t paddr, u64 size, int prot);
+ void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
+ /* Set the number of windows per domain */
+ int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
+ /* Get the number of windows per domain */
+ u32 (*domain_get_windows)(struct iommu_domain *domain);
+
+ int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
+ bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
+
+ unsigned long pgsize_bitmap;
+};
+
+/**
+ * struct iommu_device - IOMMU core representation of one IOMMU hardware
+ * instance
+ * @list: Used by the iommu-core to keep a list of registered iommus
+ * @ops: iommu-ops for talking to this iommu
+ * @dev: struct device for sysfs handling
+ */
+struct iommu_device {
+ struct list_head list;
+ const struct iommu_ops *ops;
+ struct fwnode_handle *fwnode;
+ struct device *dev;
+};
+
+int iommu_device_register(struct iommu_device *iommu);
+void iommu_device_unregister(struct iommu_device *iommu);
+int iommu_device_sysfs_add(struct iommu_device *iommu,
+ struct device *parent,
+ const struct attribute_group **groups,
+ const char *fmt, ...) __printf(4, 5);
+void iommu_device_sysfs_remove(struct iommu_device *iommu);
+int iommu_device_link(struct iommu_device *iommu, struct device *link);
+void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
+
+static inline void iommu_device_set_ops(struct iommu_device *iommu,
+ const struct iommu_ops *ops)
+{
+ iommu->ops = ops;
+}
+
+static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
+ struct fwnode_handle *fwnode)
+{
+ iommu->fwnode = fwnode;
+}
+
+static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
+{
+ return (struct iommu_device *)dev_get_drvdata(dev);
+}
+
+#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
+#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
+#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
+#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
+#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
+#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
+
+extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
+extern bool iommu_present(struct bus_type *bus);
+extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
+extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
+extern struct iommu_group *iommu_group_get_by_id(int id);
+extern void iommu_domain_free(struct iommu_domain *domain);
+extern int iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev);
+extern void iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev);
+extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
+extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot);
+extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
+ size_t size);
+extern size_t iommu_unmap_fast(struct iommu_domain *domain,
+ unsigned long iova, size_t size);
+extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+ struct scatterlist *sg,unsigned int nents, int prot);
+extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
+extern void iommu_set_fault_handler(struct iommu_domain *domain,
+ iommu_fault_handler_t handler, void *token);
+
+extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
+extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
+extern int iommu_request_dm_for_dev(struct device *dev);
+extern struct iommu_resv_region *
+iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
+ enum iommu_resv_type type);
+extern int iommu_get_group_resv_regions(struct iommu_group *group,
+ struct list_head *head);
+
+extern int iommu_attach_group(struct iommu_domain *domain,
+ struct iommu_group *group);
+extern void iommu_detach_group(struct iommu_domain *domain,
+ struct iommu_group *group);
+extern struct iommu_group *iommu_group_alloc(void);
+extern void *iommu_group_get_iommudata(struct iommu_group *group);
+extern void iommu_group_set_iommudata(struct iommu_group *group,
+ void *iommu_data,
+ void (*release)(void *iommu_data));
+extern int iommu_group_set_name(struct iommu_group *group, const char *name);
+extern int iommu_group_add_device(struct iommu_group *group,
+ struct device *dev);
+extern void iommu_group_remove_device(struct device *dev);
+extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
+ int (*fn)(struct device *, void *));
+extern struct iommu_group *iommu_group_get(struct device *dev);
+extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
+extern void iommu_group_put(struct iommu_group *group);
+extern int iommu_group_register_notifier(struct iommu_group *group,
+ struct notifier_block *nb);
+extern int iommu_group_unregister_notifier(struct iommu_group *group,
+ struct notifier_block *nb);
+extern int iommu_group_id(struct iommu_group *group);
+extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
+extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
+
+extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
+ void *data);
+extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
+ void *data);
+
+/* Window handling function prototypes */
+extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
+ phys_addr_t offset, u64 size,
+ int prot);
+extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
+
+extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
+ unsigned long iova, int flags);
+
+static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
+{
+ if (domain->ops->flush_iotlb_all)
+ domain->ops->flush_iotlb_all(domain);
+}
+
+static inline void iommu_tlb_range_add(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
+{
+ if (domain->ops->iotlb_range_add)
+ domain->ops->iotlb_range_add(domain, iova, size);
+}
+
+static inline void iommu_tlb_sync(struct iommu_domain *domain)
+{
+ if (domain->ops->iotlb_sync)
+ domain->ops->iotlb_sync(domain);
+}
+
+/* PCI device grouping function */
+extern struct iommu_group *pci_device_group(struct device *dev);
+/* Generic device grouping function */
+extern struct iommu_group *generic_device_group(struct device *dev);
+
+/**
+ * struct iommu_fwspec - per-device IOMMU instance data
+ * @ops: ops for this device's IOMMU
+ * @iommu_fwnode: firmware handle for this device's IOMMU
+ * @iommu_priv: IOMMU driver private data for this device
+ * @num_ids: number of associated device IDs
+ * @ids: IDs which this device may present to the IOMMU
+ */
+struct iommu_fwspec {
+ const struct iommu_ops *ops;
+ struct fwnode_handle *iommu_fwnode;
+ void *iommu_priv;
+ unsigned int num_ids;
+ u32 ids[1];
+};
+
+int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
+ const struct iommu_ops *ops);
+void iommu_fwspec_free(struct device *dev);
+int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
+const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
+
+#else /* CONFIG_IOMMU_API */
+
+struct iommu_ops {};
+struct iommu_group {};
+struct iommu_fwspec {};
+struct iommu_device {};
+
+static inline bool iommu_present(struct bus_type *bus)
+{
+ return false;
+}
+
+static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
+{
+ return false;
+}
+
+static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
+{
+ return NULL;
+}
+
+static inline struct iommu_group *iommu_group_get_by_id(int id)
+{
+ return NULL;
+}
+
+static inline void iommu_domain_free(struct iommu_domain *domain)
+{
+}
+
+static inline int iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+}
+
+static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
+{
+ return NULL;
+}
+
+static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot)
+{
+ return -ENODEV;
+}
+
+static inline size_t iommu_unmap(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
+{
+ return 0;
+}
+
+static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
+ unsigned long iova, int gfp_order)
+{
+ return 0;
+}
+
+static inline size_t iommu_map_sg(struct iommu_domain *domain,
+ unsigned long iova, struct scatterlist *sg,
+ unsigned int nents, int prot)
+{
+ return 0;
+}
+
+static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
+{
+}
+
+static inline void iommu_tlb_range_add(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
+{
+}
+
+static inline void iommu_tlb_sync(struct iommu_domain *domain)
+{
+}
+
+static inline int iommu_domain_window_enable(struct iommu_domain *domain,
+ u32 wnd_nr, phys_addr_t paddr,
+ u64 size, int prot)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_domain_window_disable(struct iommu_domain *domain,
+ u32 wnd_nr)
+{
+}
+
+static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
+{
+ return 0;
+}
+
+static inline void iommu_set_fault_handler(struct iommu_domain *domain,
+ iommu_fault_handler_t handler, void *token)
+{
+}
+
+static inline void iommu_get_resv_regions(struct device *dev,
+ struct list_head *list)
+{
+}
+
+static inline void iommu_put_resv_regions(struct device *dev,
+ struct list_head *list)
+{
+}
+
+static inline int iommu_get_group_resv_regions(struct iommu_group *group,
+ struct list_head *head)
+{
+ return -ENODEV;
+}
+
+static inline int iommu_request_dm_for_dev(struct device *dev)
+{
+ return -ENODEV;
+}
+
+static inline int iommu_attach_group(struct iommu_domain *domain,
+ struct iommu_group *group)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_detach_group(struct iommu_domain *domain,
+ struct iommu_group *group)
+{
+}
+
+static inline struct iommu_group *iommu_group_alloc(void)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void *iommu_group_get_iommudata(struct iommu_group *group)
+{
+ return NULL;
+}
+
+static inline void iommu_group_set_iommudata(struct iommu_group *group,
+ void *iommu_data,
+ void (*release)(void *iommu_data))
+{
+}
+
+static inline int iommu_group_set_name(struct iommu_group *group,
+ const char *name)
+{
+ return -ENODEV;
+}
+
+static inline int iommu_group_add_device(struct iommu_group *group,
+ struct device *dev)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_group_remove_device(struct device *dev)
+{
+}
+
+static inline int iommu_group_for_each_dev(struct iommu_group *group,
+ void *data,
+ int (*fn)(struct device *, void *))
+{
+ return -ENODEV;
+}
+
+static inline struct iommu_group *iommu_group_get(struct device *dev)
+{
+ return NULL;
+}
+
+static inline void iommu_group_put(struct iommu_group *group)
+{
+}
+
+static inline int iommu_group_register_notifier(struct iommu_group *group,
+ struct notifier_block *nb)
+{
+ return -ENODEV;
+}
+
+static inline int iommu_group_unregister_notifier(struct iommu_group *group,
+ struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline int iommu_group_id(struct iommu_group *group)
+{
+ return -ENODEV;
+}
+
+static inline int iommu_domain_get_attr(struct iommu_domain *domain,
+ enum iommu_attr attr, void *data)
+{
+ return -EINVAL;
+}
+
+static inline int iommu_domain_set_attr(struct iommu_domain *domain,
+ enum iommu_attr attr, void *data)
+{
+ return -EINVAL;
+}
+
+static inline int iommu_device_register(struct iommu_device *iommu)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_device_set_ops(struct iommu_device *iommu,
+ const struct iommu_ops *ops)
+{
+}
+
+static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
+ struct fwnode_handle *fwnode)
+{
+}
+
+static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
+{
+ return NULL;
+}
+
+static inline void iommu_device_unregister(struct iommu_device *iommu)
+{
+}
+
+static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
+ struct device *parent,
+ const struct attribute_group **groups,
+ const char *fmt, ...)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
+{
+}
+
+static inline int iommu_device_link(struct device *dev, struct device *link)
+{
+ return -EINVAL;
+}
+
+static inline void iommu_device_unlink(struct device *dev, struct device *link)
+{
+}
+
+static inline int iommu_fwspec_init(struct device *dev,
+ struct fwnode_handle *iommu_fwnode,
+ const struct iommu_ops *ops)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_fwspec_free(struct device *dev)
+{
+}
+
+static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
+ int num_ids)
+{
+ return -ENODEV;
+}
+
+static inline
+const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_IOMMU_API */
+
+#ifdef CONFIG_IOMMU_DEBUGFS
+extern struct dentry *iommu_debugfs_dir;
+void iommu_debugfs_setup(void);
+#else
+static inline void iommu_debugfs_setup(void) {}
+#endif
+
+#endif /* __LINUX_IOMMU_H */