From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shaik Ameer Basha Subject: [PATCH v12 20/31] iommu/exynos: add devices attached to the System MMU to an IOMMU group Date: Sun, 27 Apr 2014 13:07:52 +0530 Message-ID: <1398584283-22846-21-git-send-email-shaik.ameer@samsung.com> References: <1398584283-22846-1-git-send-email-shaik.ameer@samsung.com> Return-path: In-reply-to: <1398584283-22846-1-git-send-email-shaik.ameer-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: kgene.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, tomasz.figa-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, pullip.cho-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org, grundler-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, prathyush.k-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, rahul.sharma-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, sachin.kamat-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, supash.ramaswamy-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, Varun.Sethi-KZfg59tc24xl57MIdRCFDg@public.gmane.org, s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, t.figa-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, joshi-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org List-Id: devicetree@vger.kernel.org From: Antonios Motakis Patch written by Antonios Motakis : 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 Signed-off-by: Antonios Motakis --- 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 c9076e1..5c7f4d2 100755 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -1208,6 +1208,32 @@ 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, @@ -1216,6 +1242,8 @@ 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, }; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html