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authorJeffy Chen <jeffy.chen@rock-chips.com>2018-03-23 08:38:14 +0100
committerJoerg Roedel <jroedel@suse.de>2018-03-29 12:22:29 +0200
commit57c26957bd87a9f3b84043d0ee9cf47852a82ff9 (patch)
tree58c85afe16f079be47e752747d1719a5881f0927 /drivers/iommu/rockchip-iommu.c
parentiommu/rockchip: Add runtime PM support (diff)
downloadlinux-57c26957bd87a9f3b84043d0ee9cf47852a82ff9.tar.xz
linux-57c26957bd87a9f3b84043d0ee9cf47852a82ff9.zip
iommu/rockchip: Support sharing IOMMU between masters
There would be some masters sharing the same IOMMU device. Put them in the same iommu group and share the same iommu domain. Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/rockchip-iommu.c')
-rw-r--r--drivers/iommu/rockchip-iommu.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 9f6f74689464..5fc8656c60f9 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -104,6 +104,7 @@ struct rk_iommu {
struct iommu_device iommu;
struct list_head node; /* entry in rk_iommu_domain.iommus */
struct iommu_domain *domain; /* domain to which iommu is attached */
+ struct iommu_group *group;
};
struct rk_iommudata {
@@ -1073,6 +1074,15 @@ static void rk_iommu_remove_device(struct device *dev)
iommu_group_remove_device(dev);
}
+static struct iommu_group *rk_iommu_device_group(struct device *dev)
+{
+ struct rk_iommu *iommu;
+
+ iommu = rk_iommu_from_dev(dev);
+
+ return iommu_group_ref_get(iommu->group);
+}
+
static int rk_iommu_of_xlate(struct device *dev,
struct of_phandle_args *args)
{
@@ -1104,7 +1114,7 @@ static const struct iommu_ops rk_iommu_ops = {
.add_device = rk_iommu_add_device,
.remove_device = rk_iommu_remove_device,
.iova_to_phys = rk_iommu_iova_to_phys,
- .device_group = generic_device_group,
+ .device_group = rk_iommu_device_group,
.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
.of_xlate = rk_iommu_of_xlate,
};
@@ -1173,9 +1183,15 @@ static int rk_iommu_probe(struct platform_device *pdev)
if (err)
return err;
+ iommu->group = iommu_group_alloc();
+ if (IS_ERR(iommu->group)) {
+ err = PTR_ERR(iommu->group);
+ goto err_unprepare_clocks;
+ }
+
err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
if (err)
- goto err_unprepare_clocks;
+ goto err_put_group;
iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops);
iommu_device_set_fwnode(&iommu->iommu, &dev->of_node->fwnode);
@@ -1199,6 +1215,8 @@ static int rk_iommu_probe(struct platform_device *pdev)
return 0;
err_remove_sysfs:
iommu_device_sysfs_remove(&iommu->iommu);
+err_put_group:
+ iommu_group_put(iommu->group);
err_unprepare_clocks:
clk_bulk_unprepare(iommu->num_clocks, iommu->clocks);
return err;