Commit 4a77a6cf authored by Joerg Roedel's avatar Joerg Roedel
Browse files

introcude linux/iommu.h for an iommu api 



This patch introduces the API to abstract the exported VT-d functions
for KVM into a generic API. This way the AMD IOMMU implementation can
plug into this API later.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent c4fa3864

include/linux/iommu.h

0 → 100644
+112 −0
Original line number Diff line number Diff line 
/*

 * 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



#define IOMMU_READ	(1)

#define IOMMU_WRITE	(2)



struct device;



struct iommu_domain {

	void *priv;

};



struct iommu_ops {

	int (*domain_init)(struct iommu_domain *domain);

	void (*domain_destroy)(struct iommu_domain *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);

	void (*unmap)(struct iommu_domain *domain, unsigned long iova,

		      size_t size);

	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,

				    unsigned long iova);

};



#ifdef CONFIG_IOMMU_API



extern void register_iommu(struct iommu_ops *ops);

extern bool iommu_found(void);

extern struct iommu_domain *iommu_domain_alloc(void);

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 int iommu_map_range(struct iommu_domain *domain, unsigned long iova,

			   phys_addr_t paddr, size_t size, int prot);

extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,

			      size_t size);

extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,

				      unsigned long iova);



#else /* CONFIG_IOMMU_API */



static inline void register_iommu(struct iommu_ops *ops)

{

}



static inline bool iommu_found(void)

{

	return false;

}



static inline struct iommu_domain *iommu_domain_alloc(void)

{

	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 int iommu_map_range(struct iommu_domain *domain,

				  unsigned long iova, phys_addr_t paddr,

				  size_t size, int prot)

{

	return -ENODEV;

}



static inline void iommu_unmap_range(struct iommu_domain *domain,

				     unsigned long iova, size_t size)

{

}



static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,

					     unsigned long iova)

{

	return 0;

}



#endif /* CONFIG_IOMMU_API */



#endif /* __LINUX_IOMMU_H */