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Subject[RFC PATCH 24/34] iommu/mediatek-v1 Convert to probe/release_device() call-backs
Date
From: Joerg Roedel <jroedel@suse.de>

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@suse.de>
---
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
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