From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B94FC43331 for ; Mon, 11 Nov 2019 16:05:53 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F0F7E21925 for ; Mon, 11 Nov 2019 16:05:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F0F7E21925 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id BACC2D84; Mon, 11 Nov 2019 16:05:52 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 10EBCD2A for ; Mon, 11 Nov 2019 16:05:51 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from huawei.com (szxga06-in.huawei.com [45.249.212.32]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 3BA6012E for ; Mon, 11 Nov 2019 16:05:50 +0000 (UTC) Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 3F0D79D1053D43F7B254; Tue, 12 Nov 2019 00:05:47 +0800 (CST) Received: from localhost (10.202.226.61) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.439.0; Tue, 12 Nov 2019 00:05:39 +0800 Date: Mon, 11 Nov 2019 16:05:29 +0000 From: Jonathan Cameron To: Jean-Philippe Brucker Subject: Re: [PATCH v2 8/8] iommu/arm-smmu-v3: Add support for PCI PASID Message-ID: <20191111160529.00006dcd@huawei.com> In-Reply-To: <20191108152508.4039168-9-jean-philippe@linaro.org> References: <20191108152508.4039168-1-jean-philippe@linaro.org> <20191108152508.4039168-9-jean-philippe@linaro.org> Organization: Huawei X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; i686-w64-mingw32) MIME-Version: 1.0 X-Originating-IP: [10.202.226.61] X-CFilter-Loop: Reflected Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, robin.murphy@arm.com, sudeep.holla@arm.com, rjw@rjwysocki.net, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, guohanjun@huawei.com, zhangfei.gao@linaro.org, will@kernel.org, linux-arm-kernel@lists.infradead.org, lenb@kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Fri, 8 Nov 2019 16:25:08 +0100 Jean-Philippe Brucker wrote: > Enable PASID for PCI devices that support it. Since the SSID tables are > allocated by arm_smmu_attach_dev(), PASID has to be enabled early enough. > arm_smmu_dev_feature_enable() would be too late, since by that time the > main DMA domain has already been attached. Do it in add_device() instead. > > Signed-off-by: Jean-Philippe Brucker Seems straightforward. Reviewed-by: Jonathan Cameron Thanks for working on this stuff. I hope we an move to get the rest of the SVA elements lined up behind it so everything moves quickly in the next cycle (or two). Jonathan > --- > drivers/iommu/arm-smmu-v3.c | 51 ++++++++++++++++++++++++++++++++++++- > 1 file changed, 50 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > index 88ec0bf33492..3ee313c08325 100644 > --- a/drivers/iommu/arm-smmu-v3.c > +++ b/drivers/iommu/arm-smmu-v3.c > @@ -2633,6 +2633,49 @@ static void arm_smmu_disable_ats(struct arm_smmu_master *master) > atomic_dec(&smmu_domain->nr_ats_masters); > } > > +static int arm_smmu_enable_pasid(struct arm_smmu_master *master) > +{ > + int ret; > + int features; > + int num_pasids; > + struct pci_dev *pdev; > + > + if (!dev_is_pci(master->dev)) > + return -ENOSYS; > + > + pdev = to_pci_dev(master->dev); > + > + features = pci_pasid_features(pdev); > + if (features < 0) > + return -ENOSYS; > + > + num_pasids = pci_max_pasids(pdev); > + if (num_pasids <= 0) > + return -ENOSYS; > + > + ret = pci_enable_pasid(pdev, features); > + if (!ret) > + master->ssid_bits = min_t(u8, ilog2(num_pasids), > + master->smmu->ssid_bits); > + return ret; > +} > + > +static void arm_smmu_disable_pasid(struct arm_smmu_master *master) > +{ > + struct pci_dev *pdev; > + > + if (!dev_is_pci(master->dev)) > + return; > + > + pdev = to_pci_dev(master->dev); > + > + if (!pdev->pasid_enabled) > + return; > + > + master->ssid_bits = 0; > + pci_disable_pasid(pdev); > +} > + > static void arm_smmu_detach_dev(struct arm_smmu_master *master) > { > unsigned long flags; > @@ -2841,13 +2884,16 @@ static int arm_smmu_add_device(struct device *dev) > > master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits); > > + /* Note that PASID must be enabled before, and disabled after ATS */ > + arm_smmu_enable_pasid(master); > + > if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB)) > master->ssid_bits = min_t(u8, master->ssid_bits, > CTXDESC_LINEAR_CDMAX); > > ret = iommu_device_link(&smmu->iommu, dev); > if (ret) > - goto err_free_master; > + goto err_disable_pasid; > > group = iommu_group_get_for_dev(dev); > if (IS_ERR(group)) { > @@ -2860,6 +2906,8 @@ static int arm_smmu_add_device(struct device *dev) > > err_unlink: > iommu_device_unlink(&smmu->iommu, dev); > +err_disable_pasid: > + arm_smmu_disable_pasid(master); > err_free_master: > kfree(master); > fwspec->iommu_priv = NULL; > @@ -2880,6 +2928,7 @@ static void arm_smmu_remove_device(struct device *dev) > arm_smmu_detach_dev(master); > iommu_group_remove_device(dev); > iommu_device_unlink(&smmu->iommu, dev); > + arm_smmu_disable_pasid(master); > kfree(master); > iommu_fwspec_free(dev); > } _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu