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iommu: Add generic_device_group() function 

This function can be used as a device_group call-back and
just allocates one iommu-group per device.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-10-21 23:51:38 +02:00
parent 5e62292bad
commit 6eab556a40
2 changed files with 17 additions and 0 deletions
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15
drivers/iommu/iommu.c
View File

@ -727,6 +727,21 @@ static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque)
return data->group != NULL; return data->group != NULL;
} }
/*
* Generic device_group call-back function. It just allocates one
* iommu-group per device.
*/
struct iommu_group *generic_device_group(struct device *dev)
{
struct iommu_group *group;
group = iommu_group_alloc();
if (IS_ERR(group))
return NULL;
return group;
}
/* /*
* Use standard PCI bus topology, isolation features, and DMA alias quirks * Use standard PCI bus topology, isolation features, and DMA alias quirks
* to find or create an IOMMU group for a device. * to find or create an IOMMU group for a device.

2
include/linux/iommu.h
View File

@ -319,6 +319,8 @@ static inline size_t iommu_map_sg(struct iommu_domain *domain,
/* PCI device grouping function */ /* PCI device grouping function */
extern struct iommu_group *pci_device_group(struct device *dev); extern struct iommu_group *pci_device_group(struct device *dev);
/* Generic device grouping function */
extern struct iommu_group *generic_device_group(struct device *dev);
#else /* CONFIG_IOMMU_API */ #else /* CONFIG_IOMMU_API */