From patchwork Thu Jan 21 12:36:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 12036025 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 A16A8C433E6 for ; Thu, 21 Jan 2021 12:44:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A05B23A24 for ; Thu, 21 Jan 2021 12:44:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731037AbhAUMnM (ORCPT ); Thu, 21 Jan 2021 07:43:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731358AbhAUMlD (ORCPT ); Thu, 21 Jan 2021 07:41:03 -0500 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15335C061786 for ; Thu, 21 Jan 2021 04:39:36 -0800 (PST) Received: by mail-wr1-x433.google.com with SMTP id a12so1587409wrv.8 for ; Thu, 21 Jan 2021 04:39:36 -0800 (PST) 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=uiSdj3ahcV4jfiq23D9UAVEBduTBnIEfUfM+Rzx87y0=; b=mEVIzmJOt7Xtq5tBdG3qYyH/ROr0C/ACsTWq5nMIVXbuXPKMonC/E83/Y9dlzba62i 87+fSmjK3xudRPVJ6Eq7pB4RZg0COl2Uz3KqEBVGBlJv3FflTp1FxOChOQ4vuCHIeFkT ZKnKPW62M/2Xsmq8G/xyItQ1oX//QRXxxPTF+HYrLIr+7E+xu2D+HywmtlocgBoCu4Wt xUUDR6giwTNLfTanQ7daWKJ5vSUpWmtVanw3nkgz3iTejfXfAROIiOonnY5HEFLwvzJs YEoY+BCdHVqhC357mpmP83xqwNpcz/PiRTCoF0da5MgYmFlg8WduhxTpfepytXEJU9Nd gF5w== 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=uiSdj3ahcV4jfiq23D9UAVEBduTBnIEfUfM+Rzx87y0=; b=gsysqu/C31BTbGB8/GkLu8M1w3m1po3MfqGU56MvAmKx114bB73zAAmlQ81hECEm/I qgiRU4TiDFTMC84QjPdYR1qJxn90nNdYXgpvYzoh8cXIy93WrsczxutWLFZKDpp2TnfR ufbipm+6NaoxQYk82VFpI2GaExtQEOrmjN4C4dRiHClcbcBgsG+w3pkhutchnph/QMZJ tJZmPyOok0/TmVYOpQwu08fq+Db2z5eNKwYciPct7GIJWEgSvy7tzFR/Uo1/6B7Uw5rt 2fOybEIdUzhibOPuPXs9zWP1673EgmZ30E67a3n45FHTKkJnVcTIhDIyTKzu+sb00iS5 I5Mw== X-Gm-Message-State: AOAM530CDnm1c5+bBuH9+z/KETP44mhiVE0ykmAKda3IT4Wxi1mIYOEz CDBE9JhmmB28A2Nes3Kau1NYgw== X-Google-Smtp-Source: ABdhPJw8AvvW+MlHpoiAy5gn8AEuJrdo9yr2py8gTgiO2JaFC6Egx+dlUYfvYIO1wQ4CWNJYDDEavQ== X-Received: by 2002:a05:6000:1188:: with SMTP id g8mr14533730wrx.111.1611232774874; Thu, 21 Jan 2021 04:39:34 -0800 (PST) Received: from localhost.localdomain ([2001:1715:4e26:a7e0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id p18sm7979248wmc.31.2021.01.21.04.39.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jan 2021 04:39:34 -0800 (PST) From: Jean-Philippe Brucker To: joro@8bytes.org, will@kernel.org Cc: lorenzo.pieralisi@arm.com, robh+dt@kernel.org, guohanjun@huawei.com, sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org, robin.murphy@arm.com, Jonathan.Cameron@huawei.com, eric.auger@redhat.com, iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-accelerators@lists.ozlabs.org, baolu.lu@linux.intel.com, jacob.jun.pan@linux.intel.com, kevin.tian@intel.com, vdumpa@nvidia.com, zhangfei.gao@linaro.org, shameerali.kolothum.thodi@huawei.com, vivek.gautam@arm.com, Jean-Philippe Brucker , Arnd Bergmann , David Woodhouse , Greg Kroah-Hartman , Zhou Wang Subject: [PATCH v10 03/10] iommu: Separate IOMMU_DEV_FEAT_IOPF from IOMMU_DEV_FEAT_SVA Date: Thu, 21 Jan 2021 13:36:17 +0100 Message-Id: <20210121123623.2060416-4-jean-philippe@linaro.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210121123623.2060416-1-jean-philippe@linaro.org> References: <20210121123623.2060416-1-jean-philippe@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Some devices manage I/O Page Faults (IOPF) themselves instead of relying on PCIe PRI or Arm SMMU stall. Allow their drivers to enable SVA without mandating IOMMU-managed IOPF. The other device drivers now need to first enable IOMMU_DEV_FEAT_IOPF before enabling IOMMU_DEV_FEAT_SVA. Enabling IOMMU_DEV_FEAT_IOPF on its own doesn't have any effect visible to the device driver, it is used in combination with other features. Signed-off-by: Jean-Philippe Brucker --- Cc: Arnd Bergmann Cc: David Woodhouse Cc: Greg Kroah-Hartman Cc: Joerg Roedel Cc: Lu Baolu Cc: Will Deacon Cc: Zhangfei Gao Cc: Zhou Wang --- include/linux/iommu.h | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index b7ea11fc1a93..00348e4c3c26 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -156,10 +156,24 @@ struct iommu_resv_region { enum iommu_resv_type type; }; -/* Per device IOMMU features */ +/** + * enum iommu_dev_features - Per device IOMMU features + * @IOMMU_DEV_FEAT_AUX: Auxiliary domain feature + * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses + * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally + * enabling %IOMMU_DEV_FEAT_SVA requires + * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page + * Faults themselves instead of relying on the IOMMU. When + * supported, this feature must be enabled before and + * disabled after %IOMMU_DEV_FEAT_SVA. + * + * Device drivers query whether a feature is supported using + * iommu_dev_has_feature(), and enable it using iommu_dev_enable_feature(). + */ enum iommu_dev_features { - IOMMU_DEV_FEAT_AUX, /* Aux-domain feature */ - IOMMU_DEV_FEAT_SVA, /* Shared Virtual Addresses */ + IOMMU_DEV_FEAT_AUX, + IOMMU_DEV_FEAT_SVA, + IOMMU_DEV_FEAT_IOPF, }; #define IOMMU_PASID_INVALID (-1U)