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Commit a1015c2b authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Introduce direct mapped region handling 



Add two new functions to the IOMMU-API to allow the IOMMU
drivers to export the requirements for direct mapped regions
per device.
This is useful for exporting the information in Intel VT-d's
RMRR entries or AMD-Vi's unity mappings.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 2c1296d9

drivers/iommu/iommu.c

+16 −0
Original line number Diff line number Diff line
@@ -1469,3 +1469,19 @@ int iommu_domain_set_attr(struct iommu_domain *domain, 
	return ret;

}

EXPORT_SYMBOL_GPL(iommu_domain_set_attr);



void iommu_get_dm_regions(struct device *dev, struct list_head *list)

{

	const struct iommu_ops *ops = dev->bus->iommu_ops;



	if (ops && ops->get_dm_regions)

		ops->get_dm_regions(dev, list);

}



void iommu_put_dm_regions(struct device *dev, struct list_head *list)

{

	const struct iommu_ops *ops = dev->bus->iommu_ops;



	if (ops && ops->put_dm_regions)

		ops->put_dm_regions(dev, list);

}

include/linux/iommu.h

+31 −0
Original line number Diff line number Diff line
@@ -114,6 +114,20 @@ enum iommu_attr { 
	DOMAIN_ATTR_MAX,

};



/**

 * struct iommu_dm_region - descriptor for a direct mapped 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/...)

 */

struct iommu_dm_region {

	struct list_head	list;

	phys_addr_t		start;

	size_t			length;

	int			prot;

};



#ifdef CONFIG_IOMMU_API



/**
@@ -159,6 +173,10 @@ struct iommu_ops { 
	int (*domain_set_attr)(struct iommu_domain *domain,

			       enum iommu_attr attr, void *data);



	/* Request/Free a list of direct mapping requirements for a device */

	void (*get_dm_regions)(struct device *dev, struct list_head *list);

	void (*put_dm_regions)(struct device *dev, struct list_head *list);



	/* Window handling functions */

	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,

				    phys_addr_t paddr, u64 size, int prot);
@@ -205,6 +223,9 @@ extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t io 
extern void iommu_set_fault_handler(struct iommu_domain *domain,

			iommu_fault_handler_t handler, void *token);



extern void iommu_get_dm_regions(struct device *dev, struct list_head *list);

extern void iommu_put_dm_regions(struct device *dev, struct list_head *list);



extern int iommu_attach_group(struct iommu_domain *domain,

			      struct iommu_group *group);

extern void iommu_detach_group(struct iommu_domain *domain,
@@ -379,6 +400,16 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain, 
{

}



static inline void iommu_get_dm_regions(struct device *dev,

					struct list_head *list)

{

}



static inline void iommu_put_dm_regions(struct device *dev,

					struct list_head *list)

{

}



static inline int iommu_attach_group(struct iommu_domain *domain,

				     struct iommu_group *group)

{