From patchwork Thu Jan 21 12:36:19 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: 12036023 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 7C3A9C433E0 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 3A69223A21 for ; Thu, 21 Jan 2021 12:44:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729351AbhAUMmw (ORCPT ); Thu, 21 Jan 2021 07:42:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57032 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731386AbhAUMlD (ORCPT ); Thu, 21 Jan 2021 07:41:03 -0500 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1483C061798 for ; Thu, 21 Jan 2021 04:39:38 -0800 (PST) Received: by mail-wm1-x334.google.com with SMTP id c128so1395436wme.2 for ; Thu, 21 Jan 2021 04:39:38 -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=2eRhKsVau0r7rYJc5kg9wODttGekaxkRDREYSkG2V3g=; b=QuUMjiy5ho1cz1ta5kVsxHS6pccVZgC9l6zL1qsFa7+VqjNpuf/uQnkpICVteQGTmp 5LfYliJDrpBW/gPgpB7ezB5xGV1T8K0b2SaRShfvi4yMh0bYjCt/utdFGEstkQVoNjiA eFM8A9hStx44vAI2iPyPAZRme9cDQULk4hw1TIurC9IApmOLPwdVgoG+9t85+7OtvPu/ k//FGUbAqr9XsDSOm8HxrfdVW2FadDrap3RhH4vIsdF4h1+6UmL/+ThjrnrGApVO3mss VFwc3rD61MYEuRJPv+T1m/isVhd6pid/9m4XbVK/WijzMQ62V4m7JSmViDa9OzIQA9hl UX6g== 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=2eRhKsVau0r7rYJc5kg9wODttGekaxkRDREYSkG2V3g=; b=pTGQUrVUNp4xhm4RwafEAb6CIfIsSpsE8JtzMl82kD74zr3fkqcitu1u5RL2qz2JnS Pd8EF3DUgeIKXKJp8ta6cCScSfczUodiiG2KgBE2FbHyaeZ4LfksEk2uMpKZNWpigeod 7V8Lkmagi/HEK3DD+XenuXC5aZFjYFEKKgyqMyAJokUmtCxofQ/9NfRinccsGZPpzGma rkSALeN8/R/bPvzpTteXPOuf60/AaRvswAviaMrfZ2zBbge3eklmlju/3cZnDIwiFAq8 /t+jLpVbSHg/RS5F4zZqXJ7DRogYQCkuTg58+bhKwXYlNkLaFcuIMfFjwZMKPEmL177d 38ig== X-Gm-Message-State: AOAM532mYVk62Z2QkO30OWOEWG/7rGSc/Ew3TOExITN5i+TUliXz7388 GFcxotqCZDhcO8972Z4jAEEHdw== X-Google-Smtp-Source: ABdhPJzCnYjI4iIxIrFa+qg5mD+IvE1eNZJ/zCswHjZr0Pa6EmPz7F9ZjjKy3/Xym3kXCMfttFAK5g== X-Received: by 2002:a05:600c:1986:: with SMTP id t6mr8703507wmq.93.1611232777425; Thu, 21 Jan 2021 04:39:37 -0800 (PST) Received: from localhost.localdomain ([2001:1715:4e26:a7e0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id p18sm7979248wmc.31.2021.01.21.04.39.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jan 2021 04:39:36 -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 , Greg Kroah-Hartman , Zhou Wang Subject: [PATCH v10 05/10] uacce: Enable IOMMU_DEV_FEAT_IOPF Date: Thu, 21 Jan 2021 13:36:19 +0100 Message-Id: <20210121123623.2060416-6-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 The IOPF (I/O Page Fault) feature is now enabled independently from the SVA feature, because some IOPF implementations are device-specific and do not require IOMMU support for PCIe PRI or Arm SMMU stall. Enable IOPF unconditionally when enabling SVA for now. In the future, if a device driver implementing a uacce interface doesn't need IOPF support, it will need to tell the uacce module, for example with a new flag. Acked-by: Zhangfei Gao Signed-off-by: Jean-Philippe Brucker --- Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: Zhangfei Gao Cc: Zhou Wang --- drivers/misc/uacce/uacce.c | 39 +++++++++++++++++++++++++++++--------- 1 file changed, 30 insertions(+), 9 deletions(-) diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c index d07af4edfcac..6db7a98486ec 100644 --- a/drivers/misc/uacce/uacce.c +++ b/drivers/misc/uacce/uacce.c @@ -385,6 +385,33 @@ static void uacce_release(struct device *dev) kfree(uacce); } +static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags) +{ + if (!(flags & UACCE_DEV_SVA)) + return flags; + + flags &= ~UACCE_DEV_SVA; + + if (iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_IOPF)) + return flags; + + if (iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA)) { + iommu_dev_disable_feature(parent, IOMMU_DEV_FEAT_IOPF); + return flags; + } + + return flags | UACCE_DEV_SVA; +} + +static void uacce_disable_sva(struct uacce_device *uacce) +{ + if (!(uacce->flags & UACCE_DEV_SVA)) + return; + + iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA); + iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_IOPF); +} + /** * uacce_alloc() - alloc an accelerator * @parent: pointer of uacce parent device @@ -404,11 +431,7 @@ struct uacce_device *uacce_alloc(struct device *parent, if (!uacce) return ERR_PTR(-ENOMEM); - if (flags & UACCE_DEV_SVA) { - ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA); - if (ret) - flags &= ~UACCE_DEV_SVA; - } + flags = uacce_enable_sva(parent, flags); uacce->parent = parent; uacce->flags = flags; @@ -432,8 +455,7 @@ struct uacce_device *uacce_alloc(struct device *parent, return uacce; err_with_uacce: - if (flags & UACCE_DEV_SVA) - iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA); + uacce_disable_sva(uacce); kfree(uacce); return ERR_PTR(ret); } @@ -487,8 +509,7 @@ void uacce_remove(struct uacce_device *uacce) mutex_unlock(&uacce->queues_lock); /* disable sva now since no opened queues */ - if (uacce->flags & UACCE_DEV_SVA) - iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA); + uacce_disable_sva(uacce); if (uacce->cdev) cdev_device_del(uacce->cdev, &uacce->dev);