From patchwork Fri Apr 22 16:29:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameer Kolothum X-Patchwork-Id: 12823754 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 B2A86C433EF for ; Fri, 22 Apr 2022 16:35:01 +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=Ev3tBVxDiY04ZNl8VFLVWXwQ7CAZnYMycnVJWCqXxPY=; b=XnZx2UDOf2P9QE lQJHt5hPHhqE/4W18UAk9uVWTtMRpGT5FLZIYnpX3K6+SFhkHBzyheB3PNryZzC2jCI4odSIKF8Vj 4dKPxhujjNbMMqOZk8lZNWHpqvYVvyNwzdxoNAL7dq/UkQkRHgk3UZwd8dDDWS+fn7Hd4fxOUlDld 2HvQMw8a7pH3DhNz22ZJUW5IdIa6Kp3yh4BYGMjfx//knfwTCH8KkVD3JTuxrg0B1fgPc3bmljkR+ Z3tiEYR1VquWrAIgkiaW45/QLuFLANPsFNeBtEEEraUEfZZ5DHZfUMXaoSdEbIykRxXzON7vliYfq NHo+dKOe83+HZxVkC6dQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhwEC-001TPo-3A; Fri, 22 Apr 2022 16:33:52 +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 1nhwBP-001S5O-Kn for linux-arm-kernel@lists.infradead.org; Fri, 22 Apr 2022 16:31:01 +0000 Received: from fraeml708-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4KlKbD73cxz689Nq; Sat, 23 Apr 2022 00:28:24 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml708-chm.china.huawei.com (10.206.15.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 22 Apr 2022 18:30:57 +0200 Received: from A2006125610.china.huawei.com (10.202.227.178) 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; Fri, 22 Apr 2022 17:30:50 +0100 From: Shameer Kolothum To: , , CC: , , , , , , , , , , , , Subject: [PATCH v11 9/9] iommu/arm-smmu: Get associated RMR info and install bypass SMR Date: Fri, 22 Apr 2022 17:29:07 +0100 Message-ID: <20220422162907.1276-10-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20220422162907.1276-1-shameerali.kolothum.thodi@huawei.com> References: <20220422162907.1276-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.202.227.178] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) 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-20220422_093100_130132_19B798C7 X-CRM114-Status: GOOD ( 15.48 ) 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 From: Jon Nettleton Check if there is any RMR info associated with the devices behind the SMMU and if any, install bypass SMRs for them. This is to keep any ongoing traffic associated with these devices alive when we enable/reset SMMU during probe(). Signed-off-by: Jon Nettleton Signed-off-by: Steven Price Signed-off-by: Shameer Kolothum --- drivers/iommu/arm/arm-smmu/arm-smmu.c | 52 +++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index 568cce590ccc..e02cc2d4fb4e 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -2068,6 +2068,54 @@ err_reset_platform_ops: __maybe_unused; return err; } +static void arm_smmu_rmr_install_bypass_smr(struct arm_smmu_device *smmu) +{ + struct list_head rmr_list; + struct iommu_resv_region *e; + int idx, cnt = 0; + u32 reg; + + INIT_LIST_HEAD(&rmr_list); + iort_get_rmr_sids(dev_fwnode(smmu->dev), &rmr_list); + + /* + * Rather than trying to look at existing mappings that + * are setup by the firmware and then invalidate the ones + * that do no have matching RMR entries, just disable the + * SMMU until it gets enabled again in the reset routine. + */ + reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_sCR0); + reg |= ARM_SMMU_sCR0_CLIENTPD; + arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sCR0, reg); + + list_for_each_entry(e, &rmr_list, list) { + struct iommu_iort_rmr_data *rmr; + int i; + + rmr = container_of(e, struct iommu_iort_rmr_data, rr); + for (i = 0; i < rmr->num_sids; i++) { + idx = arm_smmu_find_sme(smmu, rmr->sids[i], ~0); + if (idx < 0) + continue; + + if (smmu->s2crs[idx].count == 0) { + smmu->smrs[idx].id = rmr->sids[i]; + smmu->smrs[idx].mask = 0; + smmu->smrs[idx].valid = true; + } + smmu->s2crs[idx].count++; + smmu->s2crs[idx].type = S2CR_TYPE_BYPASS; + smmu->s2crs[idx].privcfg = S2CR_PRIVCFG_DEFAULT; + + cnt++; + } + } + + dev_notice(smmu->dev, "\tpreserved %d boot mapping%s\n", cnt, + cnt == 1 ? "" : "s"); + iort_put_rmr_sids(dev_fwnode(smmu->dev), &rmr_list); +} + static int arm_smmu_device_probe(struct platform_device *pdev) { struct resource *res; @@ -2189,6 +2237,10 @@ static int arm_smmu_device_probe(struct platform_device *pdev) } platform_set_drvdata(pdev, smmu); + + /* Check for RMRs and install bypass SMRs if any */ + arm_smmu_rmr_install_bypass_smr(smmu); + arm_smmu_device_reset(smmu); arm_smmu_test_smr_masks(smmu);