126 lines
3.4 KiB
C
126 lines
3.4 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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#define IOMMU_READ (1)
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#define IOMMU_WRITE (2)
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#define IOMMU_CACHE (4) /* DMA cache coherency */
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struct device;
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struct iommu_domain {
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void *priv;
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};
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#define IOMMU_CAP_CACHE_COHERENCY 0x1
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struct iommu_ops {
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int (*domain_init)(struct iommu_domain *domain);
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void (*domain_destroy)(struct iommu_domain *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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void (*unmap)(struct iommu_domain *domain, unsigned long iova,
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size_t size);
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phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
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unsigned long iova);
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int (*domain_has_cap)(struct iommu_domain *domain,
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unsigned long cap);
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};
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#ifdef CONFIG_IOMMU_API
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extern void register_iommu(struct iommu_ops *ops);
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extern bool iommu_found(void);
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extern struct iommu_domain *iommu_domain_alloc(void);
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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_range(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 void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
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size_t size);
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extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
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unsigned long iova);
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extern int iommu_domain_has_cap(struct iommu_domain *domain,
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unsigned long cap);
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#else /* CONFIG_IOMMU_API */
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static inline void register_iommu(struct iommu_ops *ops)
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{
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}
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static inline bool iommu_found(void)
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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(void)
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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_range(struct iommu_domain *domain,
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unsigned long iova, phys_addr_t paddr,
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size_t 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_unmap_range(struct iommu_domain *domain,
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unsigned long iova, size_t size)
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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,
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unsigned long iova)
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{
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return 0;
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}
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static inline int domain_has_cap(struct iommu_domain *domain,
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unsigned long cap)
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{
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return 0;
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}
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#endif /* CONFIG_IOMMU_API */
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#endif /* __LINUX_IOMMU_H */
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