[RFC PATCH 24/34] iommu/mediatek-v1 Convert to probe/release_device() call-backs

[Joerg Roedel]

From: Joerg Roedel <jroedel@xxxxxxx>

Convert the Mediatek-v1 IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 drivers/iommu/mtk_iommu_v1.c | 50 +++++++++++++++---------------------
 1 file changed, 20 insertions(+), 30 deletions(-)

diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index a31be05601c9..7bdd74c7cb9f 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -416,14 +416,12 @@ static int mtk_iommu_create_mapping(struct device *dev,
 	return 0;
 }
 
-static int mtk_iommu_add_device(struct device *dev)
+static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct dma_iommu_mapping *mtk_mapping;
 	struct of_phandle_args iommu_spec;
 	struct of_phandle_iterator it;
 	struct mtk_iommu_data *data;
-	struct iommu_group *group;
 	int err;
 
 	of_for_each_phandle(&it, err, dev->of_node, "iommus",
@@ -442,35 +440,28 @@ static int mtk_iommu_add_device(struct device *dev)
 	}
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
-		return -ENODEV; /* Not a iommu client device */
+		return ERR_PTR(-ENODEV); /* Not a iommu client device */
 
-	/*
-	 * This is a short-term bodge because the ARM DMA code doesn't
-	 * understand multi-device groups, but we have to call into it
-	 * successfully (and not just rely on a normal IOMMU API attach
-	 * here) in order to set the correct DMA API ops on @dev.
-	 */
-	group = iommu_group_alloc();
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+	data = dev_iommu_priv_get(dev);
 
-	err = iommu_group_add_device(group, dev);
-	iommu_group_put(group);
-	if (err)
-		return err;
+	return &data->iommu;
+}
 
-	data = dev_iommu_priv_get(dev);
+static void mtk_iommu_probe_finalize(struct device *dev)
+{
+	struct dma_iommu_mapping *mtk_mapping;
+	struct mtk_iommu_data *data;
+	int err;
+
+	data        = dev_iommu_priv_get(dev);
 	mtk_mapping = data->dev->archdata.iommu;
-	err = arm_iommu_attach_device(dev, mtk_mapping);
-	if (err) {
-		iommu_group_remove_device(dev);
-		return err;
-	}
 
-	return iommu_device_link(&data->iommu, dev);
+	err = arm_iommu_attach_device(dev, mtk_mapping);
+	if (err)
+		dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n");
 }
 
-static void mtk_iommu_remove_device(struct device *dev)
+static void mtk_iommu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_data *data;
@@ -479,9 +470,6 @@ static void mtk_iommu_remove_device(struct device *dev)
 		return;
 
 	data = dev_iommu_priv_get(dev);
-	iommu_device_unlink(&data->iommu, dev);
-
-	iommu_group_remove_device(dev);
 	iommu_fwspec_free(dev);
 }
 
@@ -534,8 +522,10 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.map		= mtk_iommu_map,
 	.unmap		= mtk_iommu_unmap,
 	.iova_to_phys	= mtk_iommu_iova_to_phys,
-	.add_device	= mtk_iommu_add_device,
-	.remove_device	= mtk_iommu_remove_device,
+	.probe_device	= mtk_iommu_probe_device,
+	.probe_finalize = mtk_iommu_probe_finalize,
+	.release_device	= mtk_iommu_release_device,
+	.device_group	= generic_device_group,
 	.pgsize_bitmap	= ~0UL << MT2701_IOMMU_PAGE_SHIFT,
 };
 
-- 
2.17.1