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=-9.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 ED510C33C83 for ; Wed, 11 Mar 2020 12:47:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C4B3A22464 for ; Wed, 11 Mar 2020 12:47:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="MjFUpxHp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729471AbgCKMrD (ORCPT ); Wed, 11 Mar 2020 08:47:03 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:55544 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729453AbgCKMrC (ORCPT ); Wed, 11 Mar 2020 08:47:02 -0400 Received: by mail-wm1-f67.google.com with SMTP id 6so1931644wmi.5 for ; Wed, 11 Mar 2020 05:47:01 -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=b6OCZpMX/zgjbiuYOZTv/yFn5g+Ml1pLP7pmNaB6uOk=; b=MjFUpxHpBskH8AZCa8gyvEeUFGWD8nE+I7Ccpw5x/EXEZNlkDfyhMtLIM9pIzDpMVv yv0WXrEyAyadtJ8laExtvI33SAK/Yj/XjyQUF33QkNa3LaJWSWjjXypqpRKmE99YyjLb Kzy38i8AKYH4slxDJSkaJhQqvJ0EyrgpZHy986v4LgMtDJY23CAifDPwM90WBTpJll1C aCNKlrXt1hD1ylm12EIODmL0J+kS46opQN5Wu90Eqk0d9OEv7vwJtW1G2hoWdmN9jEBN PsbTfgKubpyqXHQuVx5zuV7EXMF/qnMdkHydeM2T9wWjSBiZg5D3b6eUELp4nBntbfqe BObw== 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=b6OCZpMX/zgjbiuYOZTv/yFn5g+Ml1pLP7pmNaB6uOk=; b=iZXIY/PRER2Ym/rTLwxO4LFhPH69tGyWRvm7C2R0baxME90fO/NGB3neE3vAFgcxDP Kex01+52E+2xu5py8Ndy1sG5bMKxqK5ZlJk6xgfc8i4Hf8h1ih1TQZCHWreEfzVbeGK5 U0ZqG706EGovkenepafwfNY7BqDEct8u/Xvh8Tqbsu8nMxu/xTVP0bgCMIn/QpBvz/q5 giDcqwu0cLZTPAxnm69QRQnQ1W874PYi/qYFhAXhFJZ3EVnDUnTkpmIQEhk9+dOI9Jea AQ2CLMJsD8EC8Ao022ubevfPvxgo+vkiWKGE267OHuLqXrl8rgcqr0w/SCuwT6hi8bFn TLfw== X-Gm-Message-State: ANhLgQ0oj4wTk3J7D4pF2oOlnUlfoBOW0zG0MY2wdtONGiCr8r36spjG h5p5UUYzI1Fwo9mFwFAqkuKyxQ== X-Google-Smtp-Source: ADFU+vtkHVanNQvPFzQ2zU8Odytq9w4wgEuuvipDqHybssyuXsKZkeB4j+7vEMafMywcklgaRLR7SA== X-Received: by 2002:a7b:c414:: with SMTP id k20mr3677774wmi.119.1583930820944; Wed, 11 Mar 2020 05:47:00 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:c9a8:fbc0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id c2sm8380020wma.39.2020.03.11.05.46.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2020 05:47:00 -0700 (PDT) From: Jean-Philippe Brucker To: bhelgaas@google.com, will@kernel.org, robh+dt@kernel.org, joro@8bytes.org, baolu.lu@linux.intel.com, sudeep.holla@arm.com, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org Cc: lorenzo.pieralisi@arm.com, corbet@lwn.net, mark.rutland@arm.com, liviu.dudau@arm.com, guohanjun@huawei.com, rjw@rjwysocki.net, lenb@kernel.org, robin.murphy@arm.com, dwmw2@infradead.org, amurray@thegoodpenguin.co.uk, frowand.list@gmail.com, Jean-Philippe Brucker Subject: [PATCH v2 05/11] PCI/ATS: Gather checks into pci_ats_supported() Date: Wed, 11 Mar 2020 13:45:00 +0100 Message-Id: <20200311124506.208376-6-jean-philippe@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200311124506.208376-1-jean-philippe@linaro.org> References: <20200311124506.208376-1-jean-philippe@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org IOMMU drivers need to perform several tests when checking if a device supports ATS. Move them all into a new function that returns true when a device and its host bridge support ATS. Since pci_enable_ats() now calls pci_ats_supported(), the following new checks are now common: * whether a device is trusted. Devices plugged into external-facing ports such as thunderbolt are untrusted. * whether the host bridge supports ATS, which defaults to true unless the firmware description states that ATS isn't supported by the host bridge. Signed-off-by: Jean-Philippe Brucker --- drivers/pci/ats.c | 30 +++++++++++++++++++++++++++++- include/linux/pci-ats.h | 3 +++ 2 files changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 390e92f2d8d1..bbfd0d42b8b9 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -30,6 +30,34 @@ void pci_ats_init(struct pci_dev *dev) dev->ats_cap = pos; } +/** + * pci_ats_supported - check if the device can use ATS + * @dev: the PCI device + * + * Returns true if the device supports ATS and is allowed to use it, false + * otherwise. + */ +bool pci_ats_supported(struct pci_dev *dev) +{ + struct pci_host_bridge *bridge; + + if (!dev->ats_cap) + return false; + + if (dev->untrusted) + return false; + + bridge = pci_find_host_bridge(dev->bus); + if (!bridge) + return false; + + if (!bridge->ats_supported) + return false; + + return true; +} +EXPORT_SYMBOL_GPL(pci_ats_supported); + /** * pci_enable_ats - enable the ATS capability * @dev: the PCI device @@ -42,7 +70,7 @@ int pci_enable_ats(struct pci_dev *dev, int ps) u16 ctrl; struct pci_dev *pdev; - if (!dev->ats_cap) + if (!pci_ats_supported(dev)) return -EINVAL; if (WARN_ON(dev->ats_enabled)) diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h index d08f0869f121..f75c307f346d 100644 --- a/include/linux/pci-ats.h +++ b/include/linux/pci-ats.h @@ -6,11 +6,14 @@ #ifdef CONFIG_PCI_ATS /* Address Translation Service */ +bool pci_ats_supported(struct pci_dev *dev); int pci_enable_ats(struct pci_dev *dev, int ps); void pci_disable_ats(struct pci_dev *dev); int pci_ats_queue_depth(struct pci_dev *dev); int pci_ats_page_aligned(struct pci_dev *dev); #else /* CONFIG_PCI_ATS */ +static inline bool pci_ats_supported(struct pci_dev *d) +{ return false; } static inline int pci_enable_ats(struct pci_dev *d, int ps) { return -ENODEV; } static inline void pci_disable_ats(struct pci_dev *d) { } -- 2.25.1