From patchwork Wed Mar 11 12:44:57 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: 203489 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=ham 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 2C110C18E5B for ; Wed, 11 Mar 2020 12:47:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F33DE21D56 for ; Wed, 11 Mar 2020 12:46:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="R8RuT72W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729450AbgCKMq7 (ORCPT ); Wed, 11 Mar 2020 08:46:59 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:42445 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729452AbgCKMq6 (ORCPT ); Wed, 11 Mar 2020 08:46:58 -0400 Received: by mail-wr1-f65.google.com with SMTP id v11so2423369wrm.9 for ; Wed, 11 Mar 2020 05:46:57 -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=N4gyYG6pd1qHC2GjZUAc/a5emn2edBGVA7chcRhvAO8=; b=R8RuT72WL1I4haJ6qD2A19NADfHGGL4h8E65a5bB32JeKEnVO9JbfE6y04C41FHnLL AiH3yxrWmV4b4ouGsgZnYDvH6JyHDntuFb3/9DvYzPs3xRWl9CkmzwGARwuOAyD3ENG8 ExLs4O2EfRkqOxjujXUUTbIjhiAylBxQ8ybvym8Qyo1jwtRGcka/n1mIYt++nCi7pTJf r7VZnDbXLgsvy6IWe8+Hwi6VVKzu0VjNNczUmct/KxpEmMqWQtjtAeb2DhsSv3KYbkPr VSYMt4h9O6gpK0lYTWS8aMFDJFwbWDK7v4kkJazCh6yUcurLTvS7ONepD43137VO3oBz gmyQ== 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=N4gyYG6pd1qHC2GjZUAc/a5emn2edBGVA7chcRhvAO8=; b=NlbdNPip1FMKeeURT2J/+kxE5FwA1jac0v6E5hmHQ4Y6Bs6oU29Z/HNciQDA19zCdl hhXnFks3rBgLPyrH/Ynzz/xrG6nmyoaNoOWSJn0hO/+xqBfYmiCULhQm3JFOqFtrPoOm mb+vObFfM0pQ0IkzHq66+8AqLcxE9gGdQ/ftWPK6AceYqiDdwpko5JU7OpIqj3XRy0A9 znARal0llcfBXqgzfAoOy/cbaG0fFDj+gAXoN8mkENLc1zPAnY5PJeuL1CZvQqVryRdY zQlZ2ObtAVCBbvGKZEt41+Nb+e/sbYGd3bCyauYtkbhmmIPl69ilk82kFbQt8fQ6/rs3 JsfQ== X-Gm-Message-State: ANhLgQ0nV696LC2HfBhiBpcyXeNtZL8ZENXjlhjqUiFCbxRYpS6XWyzh ZG1o5OBKnolkG4h/krtfUnh9yo9VhMY= X-Google-Smtp-Source: ADFU+vtVplsLJKhJ5k96cjG7bQIJiqMwH6aOvBxLDVX3vK8y4Ou+veGu1hCYgxMQXp8PN1ugVbeDHg== X-Received: by 2002:adf:a555:: with SMTP id j21mr4427467wrb.409.1583930817062; Wed, 11 Mar 2020 05:46:57 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:c9a8:fbc0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id c2sm8380020wma.39.2020.03.11.05.46.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2020 05:46:56 -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 02/11] PCI: Add ats_supported host bridge flag Date: Wed, 11 Mar 2020 13:44:57 +0100 Message-Id: <20200311124506.208376-3-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 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Each vendor has their own way of describing whether a host bridge supports ATS. The Intel and AMD ACPI tables selectively enable or disable ATS per device or sub-tree, while Arm has a single bit for each host bridge. For those that need it, add an ats_supported bit to the host bridge structure. Signed-off-by: Jean-Philippe Brucker --- v1->v2: try to improve the comment --- drivers/pci/probe.c | 8 ++++++++ include/linux/pci.h | 1 + 2 files changed, 9 insertions(+) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 512cb4312ddd..b5e36f06b40a 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -598,6 +598,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge) bridge->native_shpc_hotplug = 1; bridge->native_pme = 1; bridge->native_ltr = 1; + + /* + * Some systems (ACPI IORT, device-tree) declare ATS support at the host + * bridge, and clear this bit when ATS isn't supported. Others (ACPI + * DMAR and IVRS) declare ATS support with a smaller granularity, and + * need this bit set. + */ + bridge->ats_supported = 1; } struct pci_host_bridge *pci_alloc_host_bridge(size_t priv) diff --git a/include/linux/pci.h b/include/linux/pci.h index 3840a541a9de..9fe2e84d74d7 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -511,6 +511,7 @@ struct pci_host_bridge { unsigned int native_pme:1; /* OS may use PCIe PME */ unsigned int native_ltr:1; /* OS may use PCIe LTR */ unsigned int preserve_config:1; /* Preserve FW resource setup */ + unsigned int ats_supported:1; /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev,