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iommu/mediatek: Improve safety for mediatek,smi property in larb nodes

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No functional change. Just improve safety from dts.

All the larbs that connect to one IOMMU must connect with the same
smi-common. This patch checks all the mediatek,smi property for each
larb, If their mediatek,smi are different, it will return fails.
Also avoid there is no available smi-larb nodes.

Suggested-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20221018024258.19073-6-yong.wu@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yong Wu 2022-10-18 10:42:57 +08:00 committed by Joerg Roedel
parent ef693a8440
commit 6cde583d53
1 changed files with 37 additions and 16 deletions
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37
drivers/iommu/mtk_iommu.c
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@ -1054,7 +1054,7 @@ static const struct component_master_ops mtk_iommu_com_ops = {
static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **match,
struct mtk_iommu_data *data)
{
struct device_node *larbnode, *smicomm_node, *smi_subcomm_node;
struct device_node *larbnode, *frst_avail_smicomm_node = NULL;
struct platform_device *plarbdev, *pcommdev;
struct device_link *link;
int i, larb_nr, ret;
@ -1066,6 +1066,7 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
return -EINVAL;
for (i = 0; i < larb_nr; i++) {
struct device_node *smicomm_node, *smi_subcomm_node;
u32 id;
larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
@ -1106,14 +1107,12 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
goto err_larbdev_put;
}
component_match_add(dev, match, component_compare_dev, &plarbdev->dev);
platform_device_put(plarbdev);
}
/* Get smi-(sub)-common dev from the last larb. */
smi_subcomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
if (!smi_subcomm_node)
return -EINVAL;
if (!smi_subcomm_node) {
ret = -EINVAL;
goto err_larbdev_put;
}
/*
* It may have two level smi-common. the node is smi-sub-common if it
@ -1125,8 +1124,30 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
else
smicomm_node = smi_subcomm_node;
pcommdev = of_find_device_by_node(smicomm_node);
/*
* All the larbs that connect to one IOMMU must connect with the same
* smi-common.
*/
if (!frst_avail_smicomm_node) {
frst_avail_smicomm_node = smicomm_node;
} else if (frst_avail_smicomm_node != smicomm_node) {
dev_err(dev, "mediatek,smi property is not right @larb%d.", id);
of_node_put(smicomm_node);
ret = -EINVAL;
goto err_larbdev_put;
} else {
of_node_put(smicomm_node);
}
component_match_add(dev, match, component_compare_dev, &plarbdev->dev);
platform_device_put(plarbdev);
}
if (!frst_avail_smicomm_node)
return -EINVAL;
pcommdev = of_find_device_by_node(frst_avail_smicomm_node);
of_node_put(frst_avail_smicomm_node);
if (!pcommdev)
return -ENODEV;
data->smicomm_dev = &pcommdev->dev;