488 lines
15 KiB
C
488 lines
15 KiB
C
/*
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* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <joerg.roedel@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __LINUX_IOMMU_H
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#define __LINUX_IOMMU_H
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include <trace/events/iommu.h>
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#define IOMMU_READ (1 << 0)
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#define IOMMU_WRITE (1 << 1)
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#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
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#define IOMMU_NOEXEC (1 << 3)
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struct iommu_ops;
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struct iommu_group;
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struct bus_type;
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struct device;
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struct iommu_domain;
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struct notifier_block;
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/* iommu fault flags */
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#define IOMMU_FAULT_READ 0x0
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#define IOMMU_FAULT_WRITE 0x1
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typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
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struct device *, unsigned long, int, void *);
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struct iommu_domain_geometry {
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dma_addr_t aperture_start; /* First address that can be mapped */
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dma_addr_t aperture_end; /* Last address that can be mapped */
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bool force_aperture; /* DMA only allowed in mappable range? */
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};
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/* Domain feature flags */
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#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
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#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
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implementation */
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#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
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/*
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* This are the possible domain-types
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*
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* IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
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* devices
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* IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
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* IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
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* for VMs
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* IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
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* This flag allows IOMMU drivers to implement
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* certain optimizations for these domains
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*/
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#define IOMMU_DOMAIN_BLOCKED (0U)
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#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
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#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
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#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
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__IOMMU_DOMAIN_DMA_API)
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struct iommu_domain {
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unsigned type;
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const struct iommu_ops *ops;
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iommu_fault_handler_t handler;
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void *handler_token;
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struct iommu_domain_geometry geometry;
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};
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enum iommu_cap {
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IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
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transactions */
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IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
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IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
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};
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/*
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* Following constraints are specifc to FSL_PAMUV1:
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* -aperture must be power of 2, and naturally aligned
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* -number of windows must be power of 2, and address space size
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* of each window is determined by aperture size / # of windows
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* -the actual size of the mapped region of a window must be power
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* of 2 starting with 4KB and physical address must be naturally
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* aligned.
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* DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
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* The caller can invoke iommu_domain_get_attr to check if the underlying
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* iommu implementation supports these constraints.
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*/
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enum iommu_attr {
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DOMAIN_ATTR_GEOMETRY,
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DOMAIN_ATTR_PAGING,
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DOMAIN_ATTR_WINDOWS,
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DOMAIN_ATTR_FSL_PAMU_STASH,
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DOMAIN_ATTR_FSL_PAMU_ENABLE,
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DOMAIN_ATTR_FSL_PAMUV1,
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DOMAIN_ATTR_NESTING, /* two stages of translation */
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DOMAIN_ATTR_MAX,
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};
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#ifdef CONFIG_IOMMU_API
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/**
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* struct iommu_ops - iommu ops and capabilities
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* @domain_init: init iommu domain
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* @domain_destroy: destroy iommu domain
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* @attach_dev: attach device to an iommu domain
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* @detach_dev: detach device from an iommu domain
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* @map: map a physically contiguous memory region to an iommu domain
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* @unmap: unmap a physically contiguous memory region from an iommu domain
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* @map_sg: map a scatter-gather list of physically contiguous memory chunks
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* to an iommu domain
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* @iova_to_phys: translate iova to physical address
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* @add_device: add device to iommu grouping
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* @remove_device: remove device from iommu grouping
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* @domain_get_attr: Query domain attributes
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* @domain_set_attr: Change domain attributes
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* @of_xlate: add OF master IDs to iommu grouping
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* @pgsize_bitmap: bitmap of supported page sizes
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* @priv: per-instance data private to the iommu driver
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*/
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struct iommu_ops {
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bool (*capable)(enum iommu_cap);
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/* Domain allocation and freeing by the iommu driver */
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struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
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void (*domain_free)(struct iommu_domain *);
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int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
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void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
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int (*map)(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, size_t size, int prot);
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size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
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size_t size);
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size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
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struct scatterlist *sg, unsigned int nents, int prot);
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phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
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int (*add_device)(struct device *dev);
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void (*remove_device)(struct device *dev);
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int (*device_group)(struct device *dev, unsigned int *groupid);
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int (*domain_get_attr)(struct iommu_domain *domain,
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enum iommu_attr attr, void *data);
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int (*domain_set_attr)(struct iommu_domain *domain,
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enum iommu_attr attr, void *data);
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/* Window handling functions */
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int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
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phys_addr_t paddr, u64 size, int prot);
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void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
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/* Set the numer of window per domain */
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int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
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/* Get the numer of window per domain */
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u32 (*domain_get_windows)(struct iommu_domain *domain);
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#ifdef CONFIG_OF_IOMMU
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int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
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#endif
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unsigned long pgsize_bitmap;
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void *priv;
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};
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#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
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#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
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#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
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#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
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#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
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#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
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extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
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extern bool iommu_present(struct bus_type *bus);
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extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
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extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
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extern struct iommu_group *iommu_group_get_by_id(int id);
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extern void iommu_domain_free(struct iommu_domain *domain);
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extern int iommu_attach_device(struct iommu_domain *domain,
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struct device *dev);
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extern void iommu_detach_device(struct iommu_domain *domain,
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struct device *dev);
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extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, size_t size, int prot);
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extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
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size_t size);
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extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
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struct scatterlist *sg,unsigned int nents,
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int prot);
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extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
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extern void iommu_set_fault_handler(struct iommu_domain *domain,
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iommu_fault_handler_t handler, void *token);
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extern int iommu_attach_group(struct iommu_domain *domain,
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struct iommu_group *group);
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extern void iommu_detach_group(struct iommu_domain *domain,
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struct iommu_group *group);
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extern struct iommu_group *iommu_group_alloc(void);
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extern void *iommu_group_get_iommudata(struct iommu_group *group);
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extern void iommu_group_set_iommudata(struct iommu_group *group,
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void *iommu_data,
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void (*release)(void *iommu_data));
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extern int iommu_group_set_name(struct iommu_group *group, const char *name);
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extern int iommu_group_add_device(struct iommu_group *group,
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struct device *dev);
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extern void iommu_group_remove_device(struct device *dev);
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extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
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int (*fn)(struct device *, void *));
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extern struct iommu_group *iommu_group_get(struct device *dev);
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extern void iommu_group_put(struct iommu_group *group);
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extern int iommu_group_register_notifier(struct iommu_group *group,
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struct notifier_block *nb);
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extern int iommu_group_unregister_notifier(struct iommu_group *group,
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struct notifier_block *nb);
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extern int iommu_group_id(struct iommu_group *group);
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extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
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extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
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void *data);
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extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
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void *data);
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struct device *iommu_device_create(struct device *parent, void *drvdata,
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const struct attribute_group **groups,
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const char *fmt, ...);
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void iommu_device_destroy(struct device *dev);
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int iommu_device_link(struct device *dev, struct device *link);
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void iommu_device_unlink(struct device *dev, struct device *link);
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/* Window handling function prototypes */
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extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
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phys_addr_t offset, u64 size,
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int prot);
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extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
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/**
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* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
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* @domain: the iommu domain where the fault has happened
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* @dev: the device where the fault has happened
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* @iova: the faulting address
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* @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
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*
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* This function should be called by the low-level IOMMU implementations
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* whenever IOMMU faults happen, to allow high-level users, that are
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* interested in such events, to know about them.
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*
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* This event may be useful for several possible use cases:
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* - mere logging of the event
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* - dynamic TLB/PTE loading
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* - if restarting of the faulting device is required
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*
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* Returns 0 on success and an appropriate error code otherwise (if dynamic
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* PTE/TLB loading will one day be supported, implementations will be able
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* to tell whether it succeeded or not according to this return value).
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*
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* Specifically, -ENOSYS is returned if a fault handler isn't installed
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* (though fault handlers can also return -ENOSYS, in case they want to
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* elicit the default behavior of the IOMMU drivers).
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*/
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static inline int report_iommu_fault(struct iommu_domain *domain,
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struct device *dev, unsigned long iova, int flags)
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{
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int ret = -ENOSYS;
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/*
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* if upper layers showed interest and installed a fault handler,
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* invoke it.
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*/
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if (domain->handler)
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ret = domain->handler(domain, dev, iova, flags,
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domain->handler_token);
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trace_io_page_fault(dev, iova, flags);
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return ret;
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}
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static inline size_t iommu_map_sg(struct iommu_domain *domain,
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unsigned long iova, struct scatterlist *sg,
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unsigned int nents, int prot)
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{
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return domain->ops->map_sg(domain, iova, sg, nents, prot);
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}
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#else /* CONFIG_IOMMU_API */
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struct iommu_ops {};
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struct iommu_group {};
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static inline bool iommu_present(struct bus_type *bus)
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{
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return false;
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}
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static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
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{
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return false;
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}
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static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
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{
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return NULL;
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}
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static inline struct iommu_group *iommu_group_get_by_id(int id)
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{
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return NULL;
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}
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static inline void iommu_domain_free(struct iommu_domain *domain)
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{
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}
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static inline int iommu_attach_device(struct iommu_domain *domain,
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struct device *dev)
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{
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return -ENODEV;
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}
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static inline void iommu_detach_device(struct iommu_domain *domain,
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struct device *dev)
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{
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}
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static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, int gfp_order, int prot)
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{
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return -ENODEV;
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}
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static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
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int gfp_order)
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{
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return -ENODEV;
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}
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static inline size_t iommu_map_sg(struct iommu_domain *domain,
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unsigned long iova, struct scatterlist *sg,
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unsigned int nents, int prot)
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{
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return -ENODEV;
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}
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static inline int iommu_domain_window_enable(struct iommu_domain *domain,
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u32 wnd_nr, phys_addr_t paddr,
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u64 size, int prot)
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{
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return -ENODEV;
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}
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static inline void iommu_domain_window_disable(struct iommu_domain *domain,
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u32 wnd_nr)
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{
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}
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static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
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{
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return 0;
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}
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static inline void iommu_set_fault_handler(struct iommu_domain *domain,
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iommu_fault_handler_t handler, void *token)
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{
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}
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static inline int iommu_attach_group(struct iommu_domain *domain,
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struct iommu_group *group)
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{
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return -ENODEV;
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}
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static inline void iommu_detach_group(struct iommu_domain *domain,
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struct iommu_group *group)
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{
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}
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static inline struct iommu_group *iommu_group_alloc(void)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void *iommu_group_get_iommudata(struct iommu_group *group)
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{
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return NULL;
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}
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static inline void iommu_group_set_iommudata(struct iommu_group *group,
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void *iommu_data,
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void (*release)(void *iommu_data))
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{
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}
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static inline int iommu_group_set_name(struct iommu_group *group,
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const char *name)
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{
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return -ENODEV;
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}
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static inline int iommu_group_add_device(struct iommu_group *group,
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struct device *dev)
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{
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return -ENODEV;
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}
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static inline void iommu_group_remove_device(struct device *dev)
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{
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}
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static inline int iommu_group_for_each_dev(struct iommu_group *group,
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void *data,
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int (*fn)(struct device *, void *))
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{
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return -ENODEV;
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}
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static inline struct iommu_group *iommu_group_get(struct device *dev)
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{
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return NULL;
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}
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static inline void iommu_group_put(struct iommu_group *group)
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{
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}
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static inline int iommu_group_register_notifier(struct iommu_group *group,
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struct notifier_block *nb)
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{
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return -ENODEV;
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}
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static inline int iommu_group_unregister_notifier(struct iommu_group *group,
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struct notifier_block *nb)
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{
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return 0;
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}
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static inline int iommu_group_id(struct iommu_group *group)
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{
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return -ENODEV;
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}
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static inline int iommu_domain_get_attr(struct iommu_domain *domain,
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enum iommu_attr attr, void *data)
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{
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return -EINVAL;
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}
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static inline int iommu_domain_set_attr(struct iommu_domain *domain,
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enum iommu_attr attr, void *data)
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{
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return -EINVAL;
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}
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static inline struct device *iommu_device_create(struct device *parent,
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void *drvdata,
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const struct attribute_group **groups,
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const char *fmt, ...)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void iommu_device_destroy(struct device *dev)
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{
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|
}
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_IOMMU_API */
|
|
|
|
#endif /* __LINUX_IOMMU_H */
|