From nobody Sun Sep 22 00:32:33 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 84A69C433EF for ; Fri, 1 Jul 2022 05:41:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234100AbiGAFlO (ORCPT ); Fri, 1 Jul 2022 01:41:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233418AbiGAFlF (ORCPT ); Fri, 1 Jul 2022 01:41:05 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC4D768A3B for ; Thu, 30 Jun 2022 22:41:03 -0700 (PDT) X-UUID: 5a78b19ca37841caba9fba6930203fa8-20220701 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.7,REQID:157ed362-09c6-40d5-ab4c-991859e116ce,OB:0,LO B:0,IP:0,URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACTI ON:release,TS:0 X-CID-META: VersionHash:87442a2,CLOUDID:38304486-57f0-47ca-ba27-fe8c57fbf305,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: 5a78b19ca37841caba9fba6930203fa8-20220701 Received: from mtkmbs11n2.mediatek.inc [(172.21.101.187)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1562020347; Fri, 01 Jul 2022 13:40:58 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Fri, 1 Jul 2022 13:40:56 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 1 Jul 2022 13:40:55 +0800 From: Yong Wu To: Joerg Roedel , Matthias Brugger , Will Deacon CC: , , , , , Yong Wu , AngeloGioacchino Del Regno , , , , , , , , Guenter Roeck , Dan Carpenter Subject: [PATCH v3 6/7] iommu/mediatek: Improve safety for mediatek,smi property in larb nodes Date: Fri, 1 Jul 2022 13:39:41 +0800 Message-ID: <20220701053942.3266-7-yong.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220701053942.3266-1-yong.wu@mediatek.com> References: <20220701053942.3266-1-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Signed-off-by: Yong Wu --- drivers/iommu/mtk_iommu.c | 53 +++++++++++++++++++++++++++------------ 1 file changed, 37 insertions(+), 16 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 88d0dad36067..573b8a7f76f7 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_co= m_ops =3D { static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_mat= ch **match, struct mtk_iommu_data *data) { - struct device_node *larbnode, *smicomm_node, *smi_subcomm_node; + struct device_node *larbnode, *frst_avail_smicomm_node =3D NULL; struct platform_device *plarbdev, *pcommdev; 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; =20 for (i =3D 0; i < larb_nr; i++) { + struct device_node *smicomm_node, *smi_subcomm_node; u32 id; =20 larbnode =3D of_parse_phandle(dev->of_node, "mediatek,larbs", i); @@ -1096,29 +1097,49 @@ static int mtk_iommu_mm_dts_parse(struct device *de= v, struct component_match **m goto err_larbdev_put; } =20 + /* Get smi-(sub)-common dev from the last larb. */ + smi_subcomm_node =3D of_parse_phandle(larbnode, "mediatek,smi", 0); + if (!smi_subcomm_node) { + ret =3D -EINVAL; + goto err_larbdev_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 =3D of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0); + if (smicomm_node) + of_node_put(smi_subcomm_node); + else + smicomm_node =3D smi_subcomm_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 =3D smicomm_node; + } else if (frst_avail_smicomm_node !=3D smicomm_node) { + dev_err(dev, "mediatek,smi property is not right @larb%d.", id); + of_node_put(smicomm_node); + ret =3D -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); } =20 - /* Get smi-(sub)-common dev from the last larb. */ - smi_subcomm_node =3D of_parse_phandle(larbnode, "mediatek,smi", 0); - if (!smi_subcomm_node) { + if (!frst_avail_smicomm_node) { ret =3D -EINVAL; goto err_larbdev_put; } =20 - /* - * 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 =3D of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0); - if (smicomm_node) - of_node_put(smi_subcomm_node); - else - smicomm_node =3D smi_subcomm_node; - - pcommdev =3D of_find_device_by_node(smicomm_node); - of_node_put(smicomm_node); + pcommdev =3D of_find_device_by_node(frst_avail_smicomm_node); + of_node_put(frst_avail_smicomm_node); if (!pcommdev) { ret =3D -EINVAL; goto err_larbdev_put; --=20 2.18.0