Hi Antonios,
On 25 July 2013 21:04, Antonios Motakis
<a.motakis@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> 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.
>
> This patch depends on Cho KyongHo's patch series titled "[PATCH v7 00/12]
> iommu/exynos: Fixes and Enhancements of System MMU driver with DT",
> applied on a Linux 3.10.1 kernel.
This kind of meta information should go after the "---" line below.
It has been tested on the Arndale board.
>
> Changes since in v2:
> - Removed possibility for minor memory leak in case of
> misbehaving platform drivers
>
> Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/iommu/exynos-iommu.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 51d43bb..c7dd4b5 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -1134,6 +1134,32 @@ 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,
> @@ -1142,6 +1168,8 @@ 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,
> };
>
> --
> 1.8.1.2
>
--
With warm regards,
Sachin
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
