diff options
| author | Antonios Motakis <a.motakis@virtualopensystems.com> | 2013-09-16 20:13:48 +0900 |
|---|---|---|
| committer | Tushar Behera <tushar.behera@linaro.org> | 2014-03-21 14:15:24 +0530 |
| commit | 28d17755286014b9f7765347d2105cb22cc8d792 (patch) | |
| tree | b89f3eb386984bb6e7d1c9d50e5eef1a1f6dbfe4 | |
| parent | 3d83c1dfd0d9d260a43c5a6ff2066be8c107f467 (diff) | |
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.
Reviewd-by: Cho KyongHo <pullip.cho@samsung.com>
Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
| -rw-r--r-- | drivers/iommu/exynos-iommu.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 543ea2e07c42..2beb197ee86a 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -1213,6 +1213,32 @@ 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, @@ -1221,6 +1247,8 @@ 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, }; |