From patchwork Mon Apr 4 12:42:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 12800174 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 9A1B4C433F5 for ; Mon, 4 Apr 2022 12:48:06 +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=hEViZoHaENo10spaZ/mOwDyu4zl3/Rgva9ZIu4Fb4F0=; b=kAlaOq3onT3BPT X2k+HtXWtcbk5CFyWUjDTJz5foFqYqlTOyF4sMLAgP1ALswYo0AhWiAquUkf1zU12y32EmsorNbeC doq3EtdxL+UD1z+E5RDQVTWJXQqEHM6yLq5hUAsYhhdoQYtgZzF3rOsKes4xIRBgNRT1Ku5P+90P9 Ekd+oerM66AHuXboNQBuzO0V1EjFAxqq3Hjt0m/2t06ZAxetwoBgBb2INGFfLlRydaizPCj0Bjp5/ PNOOGC30yK4F64rXoENDbV6rVOVapxPg78wHIGqTuBd+inlUASEGovriOs5gLTSTX6pAze3gRPr+f a/1+JcjXADUSU6oI4Txw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nbM6h-00ExJo-V4; Mon, 04 Apr 2022 12:46:56 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nbM4V-00EwCJ-1P for linux-arm-kernel@lists.infradead.org; Mon, 04 Apr 2022 12:44:40 +0000 Received: from fraeml710-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4KX9R1210Xz68652; Mon, 4 Apr 2022 20:42:37 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml710-chm.china.huawei.com (10.206.15.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 4 Apr 2022 14:44:36 +0200 Received: from A2006125610.china.huawei.com (10.47.93.34) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 4 Apr 2022 13:44:28 +0100 From: Shameer Kolothum To: , , CC: , , , , , , , , , , , , Subject: [PATCH v9 10/11] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE Date: Mon, 4 Apr 2022 13:42:08 +0100 Message-ID: <20220404124209.1086-11-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20220404124209.1086-1-shameerali.kolothum.thodi@huawei.com> References: <20220404124209.1086-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.93.34] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220404_054439_252978_7D510B2C X-CRM114-Status: GOOD ( 13.38 ) 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 Check if there is any RMR info associated with the devices behind the SMMUv3 and if any, install bypass STEs for them. This is to keep any ongoing traffic associated with these devices alive when we enable/reset SMMUv3 during probe(). Signed-off-by: Shameer Kolothum --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 33 +++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 57f831c44155..627a2b498e78 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3754,6 +3754,36 @@ static void __iomem *arm_smmu_ioremap(struct device *dev, resource_size_t start, return devm_ioremap_resource(dev, &res); } +static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu) +{ + struct list_head rmr_list; + struct iommu_resv_region *e; + + INIT_LIST_HEAD(&rmr_list); + iort_get_rmr_sids(dev_fwnode(smmu->dev), &rmr_list); + + list_for_each_entry(e, &rmr_list, list) { + __le64 *step; + const u32 *sids = e->fw_data.rmr.sids; + u32 num_sids = e->fw_data.rmr.num_sids; + int ret, i; + + for (i = 0; i < num_sids; i++) { + ret = arm_smmu_init_sid_strtab(smmu, sids[i]); + if (ret) { + dev_err(smmu->dev, "RMR SID(0x%x) bypass failed\n", + sids[i]); + continue; + } + + step = arm_smmu_get_step_for_sid(smmu, sids[i]); + arm_smmu_init_bypass_stes(step, 1, true); + } + } + + iort_put_rmr_sids(dev_fwnode(smmu->dev), &rmr_list); +} + static int arm_smmu_device_probe(struct platform_device *pdev) { int irq, ret; @@ -3835,6 +3865,9 @@ static int arm_smmu_device_probe(struct platform_device *pdev) /* Record our private device structure */ platform_set_drvdata(pdev, smmu); + /* Check for RMRs and install bypass STEs if any */ + arm_smmu_rmr_install_bypass_ste(smmu); + /* Reset the device */ ret = arm_smmu_device_reset(smmu, bypass); if (ret)