From patchwork Tue May 19 17:54:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 11558321 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 98996138A for ; Tue, 19 May 2020 18:02:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8032B20890 for ; Tue, 19 May 2020 18:02:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="Y4EdnjwY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729214AbgESSCB (ORCPT ); Tue, 19 May 2020 14:02:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729197AbgESSCB (ORCPT ); Tue, 19 May 2020 14:02:01 -0400 Received: from mail-wm1-x344.google.com (mail-wm1-x344.google.com [IPv6:2a00:1450:4864:20::344]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6725C08C5C0 for ; Tue, 19 May 2020 11:02:00 -0700 (PDT) Received: by mail-wm1-x344.google.com with SMTP id u188so220731wmu.1 for ; Tue, 19 May 2020 11:02:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=w0kdAS+3V4p7jXN1k79MYNGRv9Y+4JMnAcNVoiF0l70=; b=Y4EdnjwYGiovh5kRncy2PI1+5V23I9EidrfOm90dz7a75obSThtBtY4iz/6hLBVCho 5gutgO9+jYJaqa3AP50b579CyD3Xo8Os+g5ZMtz+rvzj3KIv4+JVix3pPmzIdWGBJpUr mRdFDzxwXg8P6rMBwMIB7hmJCUHwiDSjb9udlALkBO4crYuf5bUdIRrst4t2//W5+BIr qDjRWz0EZjqj5ojI8fljkyY6ePbeArnslKBHUJdWTLeNiK8/mjqfUvalHtpMS9aAXXYY 1FNHNPtwsiFRQScSD/UobANFMpQMISm2uWThO2evgtfehAQl/p6SzjFc3OPNw3sSLGHi TQ7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=w0kdAS+3V4p7jXN1k79MYNGRv9Y+4JMnAcNVoiF0l70=; b=Hkxu0ee1Pj+O3H5ndOYE1H24m32+rS72yCwKmBqMnJvpKGI8b+NOeUMd1YTTQn+Lth i7i+MM7kkoq5jDHyVAUNgXDDRYGVwEoFtVuX7hUnxkXi7uU5Xl79rlL0euDxniAtmN8Q 2yGVa2dTGJCJbASdupmvFm/mtB50OaFsi2CWG+a9br8j9HZIYJ+bR/fcBYHvPNqXuYt1 c94wpOJOflbBTGfnzxqKSCO1gJSLFV20EM+NJ+vlRs9gLpoMAbU+wJxbfVZqIf4wUSaE ieWKG866WNrGBnn8afiBNUDHDcQS3hRUi1Dvvr5BMXceLqRjs6Rg+r8bQS0g+Lbc/R3D Am6A== X-Gm-Message-State: AOAM531D8ffZcKmHwtC7vhUq5nhimljH45jxalPQRIiRjFJ4Se9JLEGg /HbH7b2PTSjigMnqT1NVTHPC7w== X-Google-Smtp-Source: ABdhPJxiur973rQO7P0is4n9bTcqUoLADPVJgaczJU1ETHTcZpVacHBincB+tnOWfVKyZnCnndXCAg== X-Received: by 2002:a7b:c3da:: with SMTP id t26mr575120wmj.146.1589911319392; Tue, 19 May 2020 11:01:59 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226e:c200:c43b:ef78:d083:b355]) by smtp.gmail.com with ESMTPSA id 1sm510496wmz.13.2020.05.19.11.01.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2020 11:01:58 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: joro@8bytes.org, catalin.marinas@arm.com, will@kernel.org, robin.murphy@arm.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, felix.kuehling@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, fenghua.yu@intel.com, hch@infradead.org, Jean-Philippe Brucker Subject: [PATCH v7 15/24] iommu/arm-smmu-v3: Add SVA device feature Date: Tue, 19 May 2020 19:54:53 +0200 Message-Id: <20200519175502.2504091-16-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200519175502.2504091-1-jean-philippe@linaro.org> References: <20200519175502.2504091-1-jean-philippe@linaro.org> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Implement the IOMMU device feature callbacks to support the SVA feature. At the moment dev_has_feat() returns false since I/O Page Faults isn't yet implemented. Signed-off-by: Jean-Philippe Brucker --- drivers/iommu/arm-smmu-v3.c | 124 ++++++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index a9f6f1d7014e..b016b61cee23 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -703,6 +703,8 @@ struct arm_smmu_master { u32 *sids; unsigned int num_sids; bool ats_enabled; + bool sva_enabled; + struct list_head bonds; unsigned int ssid_bits; }; @@ -3013,6 +3015,19 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) master = dev_iommu_priv_get(dev); smmu = master->smmu; + /* + * Checking that SVA is disabled ensures that this device isn't bound to + * any mm, and can be safely detached from its old domain. Bonds cannot + * be removed concurrently since we're holding the group mutex. + */ + mutex_lock(&sva_lock); + if (master->sva_enabled) { + mutex_unlock(&sva_lock); + dev_err(dev, "cannot attach - SVA enabled\n"); + return -EBUSY; + } + mutex_unlock(&sva_lock); + arm_smmu_detach_dev(master); mutex_lock(&smmu_domain->init_mutex); @@ -3161,6 +3176,7 @@ static int arm_smmu_add_device(struct device *dev) master->smmu = smmu; master->sids = fwspec->ids; master->num_sids = fwspec->num_ids; + INIT_LIST_HEAD(&master->bonds); dev_iommu_priv_set(dev, master); /* Check the SIDs are in range of the SMMU and our stream table */ @@ -3230,6 +3246,7 @@ static void arm_smmu_remove_device(struct device *dev) master = dev_iommu_priv_get(dev); smmu = master->smmu; + WARN_ON(master->sva_enabled); arm_smmu_detach_dev(master); iommu_group_remove_device(dev); iommu_device_unlink(&smmu->iommu, dev); @@ -3349,6 +3366,109 @@ static void arm_smmu_get_resv_regions(struct device *dev, iommu_dma_get_resv_regions(dev, head); } +static bool arm_smmu_iopf_supported(struct arm_smmu_master *master) +{ + return false; +} + +static bool arm_smmu_dev_has_feature(struct device *dev, + enum iommu_dev_features feat) +{ + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + + if (!master) + return false; + + switch (feat) { + case IOMMU_DEV_FEAT_SVA: + if (!(master->smmu->features & ARM_SMMU_FEAT_SVA)) + return false; + + /* SSID and IOPF support are mandatory for the moment */ + return master->ssid_bits && arm_smmu_iopf_supported(master); + default: + return false; + } +} + +static bool arm_smmu_dev_feature_enabled(struct device *dev, + enum iommu_dev_features feat) +{ + bool enabled = false; + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + + if (!master) + return false; + + switch (feat) { + case IOMMU_DEV_FEAT_SVA: + mutex_lock(&sva_lock); + enabled = master->sva_enabled; + mutex_unlock(&sva_lock); + return enabled; + default: + return false; + } +} + +static int arm_smmu_dev_enable_sva(struct device *dev) +{ + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + + mutex_lock(&sva_lock); + master->sva_enabled = true; + mutex_unlock(&sva_lock); + + return 0; +} + +static int arm_smmu_dev_disable_sva(struct device *dev) +{ + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + + mutex_lock(&sva_lock); + if (!list_empty(&master->bonds)) { + dev_err(dev, "cannot disable SVA, device is bound\n"); + mutex_unlock(&sva_lock); + return -EBUSY; + } + master->sva_enabled = false; + mutex_unlock(&sva_lock); + + return 0; +} + +static int arm_smmu_dev_enable_feature(struct device *dev, + enum iommu_dev_features feat) +{ + if (!arm_smmu_dev_has_feature(dev, feat)) + return -ENODEV; + + if (arm_smmu_dev_feature_enabled(dev, feat)) + return -EBUSY; + + switch (feat) { + case IOMMU_DEV_FEAT_SVA: + return arm_smmu_dev_enable_sva(dev); + default: + return -EINVAL; + } +} + +static int arm_smmu_dev_disable_feature(struct device *dev, + enum iommu_dev_features feat) +{ + if (!arm_smmu_dev_feature_enabled(dev, feat)) + return -EINVAL; + + switch (feat) { + case IOMMU_DEV_FEAT_SVA: + return arm_smmu_dev_disable_sva(dev); + default: + return -EINVAL; + } +} + static struct iommu_ops arm_smmu_ops = { .capable = arm_smmu_capable, .domain_alloc = arm_smmu_domain_alloc, @@ -3367,6 +3487,10 @@ static struct iommu_ops arm_smmu_ops = { .of_xlate = arm_smmu_of_xlate, .get_resv_regions = arm_smmu_get_resv_regions, .put_resv_regions = generic_iommu_put_resv_regions, + .dev_has_feat = arm_smmu_dev_has_feature, + .dev_feat_enabled = arm_smmu_dev_feature_enabled, + .dev_enable_feat = arm_smmu_dev_enable_feature, + .dev_disable_feat = arm_smmu_dev_disable_feature, .pgsize_bitmap = -1UL, /* Restricted during device attach */ };