From: Yong Wu <yong.wu@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Will Deacon <will@kernel.org>
Cc: <iommu@lists.linux-foundation.org>,
<linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, "Yong Wu" <yong.wu@mediatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
<mingyuan.ma@mediatek.com>, <yf.wang@mediatek.com>,
<libo.kang@mediatek.com>, <chengci.xu@mediatek.com>,
<youlin.pei@mediatek.com>, <anan.sun@mediatek.com>,
<xueqi.zhang@mediatek.com>, Guenter Roeck <groeck@chromium.org>,
"Dan Carpenter" <dan.carpenter@oracle.com>
Subject: [PATCH v2 4/5] iommu/mediatek: Improve safety for mediatek, smi property in larb nodes
Date: Thu, 16 Jun 2022 13:42:02 +0800 [thread overview]
Message-ID: <20220616054203.11365-5-yong.wu@mediatek.com> (raw)
In-Reply-To: <20220616054203.11365-1-yong.wu@mediatek.com>
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>
---
drivers/iommu/mtk_iommu.c | 49 ++++++++++++++++++++++++++-------------
1 file changed, 33 insertions(+), 16 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index a869d4aee7b3..5e86fd48928a 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -1044,7 +1044,7 @@ 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;
struct device_link *link;
int i, larb_nr, ret;
@@ -1056,6 +1056,7 @@ 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);
@@ -1091,27 +1092,43 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
}
data->larb_imu[id].dev = &plarbdev->dev;
+ /* Get smi-(sub)-common dev from the last larb. */
+ smi_subcomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
+ if (!smi_subcomm_node) {
+ ret = -EINVAL;
+ goto err_larbnode_put;
+ }
+
+ /*
+ * It may have two level smi-common. the node is smi-sub-common if it
+ * has a new mediatek,smi property. otherwise it is smi-commmon.
+ */
+ smicomm_node = of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0);
+ if (smicomm_node)
+ of_node_put(smi_subcomm_node);
+ else
+ smicomm_node = smi_subcomm_node;
+
+ if (!frst_avail_smicomm_node) {
+ frst_avail_smicomm_node = smicomm_node;
+ } else if (frst_avail_smicomm_node != smicomm_node) {
+ dev_err(dev, "mediatek,smi is not right @larb%d.", id);
+ of_node_put(smicomm_node);
+ ret = -EINVAL;
+ goto err_larbnode_put;
+ } else {
+ of_node_put(smicomm_node);
+ }
+
component_match_add_release(dev, match, component_release_of,
component_compare_of, larbnode);
}
- /* Get smi-(sub)-common dev from the last larb. */
- smi_subcomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
- if (!smi_subcomm_node)
+ if (!frst_avail_smicomm_node)
return -EINVAL;
- /*
- * It may have two level smi-common. the node is smi-sub-common if it
- * has a new mediatek,smi property. otherwise it is smi-commmon.
- */
- smicomm_node = of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0);
- if (smicomm_node)
- of_node_put(smi_subcomm_node);
- else
- smicomm_node = smi_subcomm_node;
-
- plarbdev = of_find_device_by_node(smicomm_node);
- of_node_put(smicomm_node);
+ plarbdev = of_find_device_by_node(frst_avail_smicomm_node);
+ of_node_put(frst_avail_smicomm_node);
data->smicomm_dev = &plarbdev->dev;
link = device_link_add(data->smicomm_dev, dev,
--
2.18.0
next prev parent reply other threads:[~2022-06-16 5:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-16 5:41 [PATCH v2 0/5] iommu/mediatek: Improve safety from dts Yong Wu
2022-06-16 5:41 ` [PATCH v2 1/5] iommu/mediatek: Use dev_err_probe to mute probe_defer err log Yong Wu
2022-06-16 13:28 ` Matthias Brugger
2022-06-16 5:42 ` [PATCH v2 2/5] iommu/mediatek: Add error path for loop of mm_dts_parse Yong Wu
2022-06-16 8:59 ` Robin Murphy
2022-06-16 10:08 ` Yong Wu
2022-06-16 10:31 ` Robin Murphy
2022-06-23 1:54 ` Yong Wu
2022-06-23 10:08 ` Robin Murphy
2022-06-16 13:49 ` Matthias Brugger
2022-06-23 2:12 ` Yong Wu
2022-06-16 5:42 ` [PATCH v2 3/5] iommu/mediatek: Validate number of phandles associated with "mediatek, larbs" Yong Wu
2022-06-16 5:42 ` Yong Wu [this message]
2022-06-16 5:42 ` [PATCH v2 5/5] iommu/mediatek: Remove a unused "mapping" which is only for v1 Yong Wu
2022-06-16 12:03 ` AngeloGioacchino Del Regno
2022-06-16 13:56 ` Matthias Brugger
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