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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: Cho KyongHo <pullip.cho@samsung.com>
Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Shaik Ameeer Basha <shaik.ameer@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Antonios Motakis 2014-05-12 11:44:59 +05:30 committed by Joerg Roedel
parent d09d78fc98
commit bf4a1c9202
1 changed files with 28 additions and 0 deletions
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28
drivers/iommu/exynos-iommu.c
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@ -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,
};