Commit 0cd76dd1 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Add domain-attribute handlers 



This patch introduces an extension to the iommu-api to get
and set attributes for an iommu_domain. Two functions are
introduced for this:

	* iommu_domain_get_attr()
	* iommu_domain_set_attr()

These functions will be used to make the iommu-api suitable
for GART-like IOMMUs and to implement hardware-specifc
api-extensions.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent bd0a521e

drivers/iommu/iommu.c

+20 −0
Original line number Diff line number Diff line
@@ -344,3 +344,23 @@ int iommu_device_group(struct device *dev, unsigned int *groupid) 
	return -ENODEV;

}

EXPORT_SYMBOL_GPL(iommu_device_group);



int iommu_domain_get_attr(struct iommu_domain *domain,

			  enum iommu_attr attr, void *data)

{

	if (!domain->ops->domain_get_attr)

		return -EINVAL;



	return domain->ops->domain_get_attr(domain, attr, data);

}

EXPORT_SYMBOL_GPL(iommu_domain_get_attr);



int iommu_domain_set_attr(struct iommu_domain *domain,

			  enum iommu_attr attr, void *data)

{

	if (!domain->ops->domain_set_attr)

		return -EINVAL;



	return domain->ops->domain_set_attr(domain, attr, data);

}

EXPORT_SYMBOL_GPL(iommu_domain_set_attr);

include/linux/iommu.h

+27 −1
Original line number Diff line number Diff line
@@ -47,6 +47,10 @@ struct iommu_domain { 
#define IOMMU_CAP_CACHE_COHERENCY	0x1

#define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */



enum iommu_attr {

	DOMAIN_ATTR_MAX,

};



#ifdef CONFIG_IOMMU_API



/**
@@ -59,7 +63,8 @@ struct iommu_domain { 
 * @unmap: unmap a physically contiguous memory region from an iommu domain

 * @iova_to_phys: translate iova to physical address

 * @domain_has_cap: domain capabilities query

 * @commit: commit iommu domain

 * @domain_get_attr: Query domain attributes

 * @domain_set_attr: Change domain attributes

 * @pgsize_bitmap: bitmap of supported page sizes

 */

struct iommu_ops {
@@ -76,6 +81,10 @@ struct iommu_ops { 
	int (*domain_has_cap)(struct iommu_domain *domain,

			      unsigned long cap);

	int (*device_group)(struct device *dev, unsigned int *groupid);

	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);

	unsigned long pgsize_bitmap;

};
@@ -99,6 +108,11 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain, 
			iommu_fault_handler_t handler, void *token);

extern int iommu_device_group(struct device *dev, unsigned int *groupid);



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);



/**

 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework

 * @domain: the iommu domain where the fault has happened
@@ -202,6 +216,18 @@ static inline int iommu_device_group(struct device *dev, unsigned int *groupid) 
	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;

}



#endif /* CONFIG_IOMMU_API */



#endif /* __LINUX_IOMMU_H */

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