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Commit 8a69961c authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Add helpers to set/get default domain type 



Add a couple of functions to allow changing the default
domain type from architecture code and a function for iommu
drivers to request whether the default domain is
passthrough.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent faf14989

drivers/iommu/iommu.c

+22 −0
Original line number Diff line number Diff line
@@ -2213,6 +2213,28 @@ int iommu_request_dma_domain_for_dev(struct device *dev) 
	return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA);

}



void iommu_set_default_passthrough(bool cmd_line)

{

	if (cmd_line)

		iommu_set_cmd_line_dma_api();



	iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;

}



void iommu_set_default_translated(bool cmd_line)

{

	if (cmd_line)

		iommu_set_cmd_line_dma_api();



	iommu_def_domain_type = IOMMU_DOMAIN_DMA;

}



bool iommu_default_passthrough(void)

{

	return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY;

}

EXPORT_SYMBOL_GPL(iommu_default_passthrough);



const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)

{

	const struct iommu_ops *ops = NULL;

include/linux/iommu.h

+16 −0
Original line number Diff line number Diff line
@@ -436,6 +436,9 @@ extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); 
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);

extern int iommu_request_dm_for_dev(struct device *dev);

extern int iommu_request_dma_domain_for_dev(struct device *dev);

extern void iommu_set_default_passthrough(bool cmd_line);

extern void iommu_set_default_translated(bool cmd_line);

extern bool iommu_default_passthrough(void);

extern struct iommu_resv_region *

iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,

			enum iommu_resv_type type);
@@ -736,6 +739,19 @@ static inline int iommu_request_dma_domain_for_dev(struct device *dev) 
	return -ENODEV;

}



static inline void iommu_set_default_passthrough(bool cmd_line)

{

}



static inline void iommu_set_default_translated(bool cmd_line)

{

}



static inline bool iommu_default_passthrough(void)

{

	return true;

}



static inline int iommu_attach_group(struct iommu_domain *domain,

				     struct iommu_group *group)

{