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Commit bf4a1c92 authored by Antonios Motakis's avatar Antonios Motakis Committed by Joerg Roedel
Browse files

iommu/exynos: Add devices attached to the System MMU to an IOMMU group 



Patch written by Antonios Motakis <a.motakis@virtualopensystems.com>:

IOMMU groups are expected by certain users of the IOMMU API,
e.g. VFIO. Since each device is behind its own System MMU, we
can allocate a new IOMMU group for each device.

Reviewed-by: default avatarCho KyongHo <pullip.cho@samsung.com>
Signed-off-by: default avatarAntonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: default avatarShaik Ameeer Basha <shaik.ameer@samsung.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent d09d78fc

drivers/iommu/exynos-iommu.c

+28 −0
Original line number Diff line number Diff line
@@ -964,6 +964,32 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, 
	return phys;

}



static int exynos_iommu_add_device(struct device *dev)

{

	struct iommu_group *group;

	int ret;



	group = iommu_group_get(dev);



	if (!group) {

		group = iommu_group_alloc();

		if (IS_ERR(group)) {

			dev_err(dev, "Failed to allocate IOMMU group\n");

			return PTR_ERR(group);

		}

	}



	ret = iommu_group_add_device(group, dev);

	iommu_group_put(group);



	return ret;

}



static void exynos_iommu_remove_device(struct device *dev)

{

	iommu_group_remove_device(dev);

}



static struct iommu_ops exynos_iommu_ops = {

	.domain_init = &exynos_iommu_domain_init,

	.domain_destroy = &exynos_iommu_domain_destroy,
@@ -972,6 +998,8 @@ static struct iommu_ops exynos_iommu_ops = { 
	.map = &exynos_iommu_map,

	.unmap = &exynos_iommu_unmap,

	.iova_to_phys = &exynos_iommu_iova_to_phys,

	.add_device = &exynos_iommu_add_device,

	.remove_device = &exynos_iommu_remove_device,

	.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,

};