From patchwork Tue Oct 18 02:42:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?WW9uZyBXdSAo5ZC05YuHKQ==?= X-Patchwork-Id: 13009825 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6DE55C433FE for ; Tue, 18 Oct 2022 02:45:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=RMvkTAyxejyFpu6ILtsz5BXaW5tD7RNmoY0+5lf33ZY=; b=yqfzWQAKAmMWhF GMHmJU9YyT3jCjqdGu0aISVUVcEIv6lorFZi+N6gSPbnH3HoLa2FmNUXhJOPdumTGEd/dioO6xR/S ec8c4U1Bvv4ISGhyRFiur6+g6kQR/xzyVThBBUw4XrqRQhTtOvdJ7Qao8KDXtO9KRTNvVhc+bTKvq UhmcoV3MkUXJo2Twhn+UwXKV4MDrz3HD2jlyKM7PWDPmv+QmBipb740nVQUtPu2dYlc5ZzXhyo/04 /YHK+R4aMRSjfay3n6paF2nwM9ILS7WP6lCXSZEtSdrOcjlvXLvEcuwssO1AjD3Cpmndae3v1+L/e jQK1tEV0aeVTaRrjbZsw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1okcb3-001dbl-T9; Tue, 18 Oct 2022 02:44:50 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1okcaf-001czN-Vl; Tue, 18 Oct 2022 02:44:27 +0000 X-UUID: 4b1a75857c3a46fd85855914e92901b8-20221017 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=S9CiSGacHda1AaC9awrxZpBTvE2nupBNCp/G7x7Mw6A=; b=KblaKHb0UNen9SW+Cx5YmWrG9vRvhzX5NYFPoWeW8P/7Y+e4IH5pvY6Tn3GRUblrT/8o4UUbj7CMo8JhdAapL50aMrQtspBNpKog36IyX+cJlricjZrnsFJsWfljRziisoCQwuDqXKtj6v96ssvR6kK+VWUnNwzpoRBTJtrN+zE=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.11,REQID:b771809f-f554-460b-8747-fd9e3500a172,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:39a5ff1,CLOUDID:c07c93ee-314c-4293-acb8-ca4299dd021f,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0 X-UUID: 4b1a75857c3a46fd85855914e92901b8-20221017 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 33757015; Mon, 17 Oct 2022 19:44:24 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Tue, 18 Oct 2022 10:43:48 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Tue, 18 Oct 2022 10:43:47 +0800 From: Yong Wu To: Joerg Roedel , Matthias Brugger , Will Deacon CC: Robin Murphy , , , , , Yong Wu , AngeloGioacchino Del Regno , , , , , , , , Guenter Roeck , Dan Carpenter Subject: [PATCH v7 5/6] iommu/mediatek: Improve safety for mediatek,smi property in larb nodes Date: Tue, 18 Oct 2022 10:42:57 +0800 Message-ID: <20221018024258.19073-6-yong.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20221018024258.19073-1-yong.wu@mediatek.com> References: <20221018024258.19073-1-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221017_194426_038346_04DA7970 X-CRM114-Status: GOOD ( 20.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: Matthias Brugger --- 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 9cbff48f03c0..f7ac102e343f 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1042,7 +1042,7 @@ 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; @@ -1054,6 +1054,7 @@ 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); @@ -1094,27 +1095,47 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m goto err_larbdev_put; } + /* 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_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 = of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0); + if (smicomm_node) + of_node_put(smi_subcomm_node); + else + smicomm_node = 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 = 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); } - /* 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; - - pcommdev = of_find_device_by_node(smicomm_node); - of_node_put(smicomm_node); + 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;