From patchwork Wed Jun 20 02:14:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 10475803 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 806D4604D3 for ; Wed, 20 Jun 2018 02:15:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 70C3128E71 for ; Wed, 20 Jun 2018 02:15:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62F4E28E76; Wed, 20 Jun 2018 02:15:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F0E6E28E71 for ; Wed, 20 Jun 2018 02:15:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753960AbeFTCOw (ORCPT ); Tue, 19 Jun 2018 22:14:52 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:44818 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753741AbeFTCOv (ORCPT ); Tue, 19 Jun 2018 22:14:51 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id B219D6081B; Wed, 20 Jun 2018 02:14:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1529460890; bh=GG6iH0tfzd6ErPV6uC89Y8tZh2GVukDY3MwhvjAslJ0=; h=From:To:Cc:Subject:Date:From; b=NnUX2nNxs9qtJ/SOqKD3UgDxO0OVcv6t5WQW551zX5c1V9S+sm4aOMSkOBPG/UfgQ VA8fR6UpLAIE/H308kNQZLdXtG7oYaP4JwgxwoomLUwul00iT367oDB6x0HU0pIsW9 3n/cwILhWG8LIvft5tyouHzWh+/eZLhUYK1N32cE= Received: from drakthul.qualcomm.com (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 3C8AA6081B; Wed, 20 Jun 2018 02:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1529460890; bh=GG6iH0tfzd6ErPV6uC89Y8tZh2GVukDY3MwhvjAslJ0=; h=From:To:Cc:Subject:Date:From; b=NnUX2nNxs9qtJ/SOqKD3UgDxO0OVcv6t5WQW551zX5c1V9S+sm4aOMSkOBPG/UfgQ VA8fR6UpLAIE/H308kNQZLdXtG7oYaP4JwgxwoomLUwul00iT367oDB6x0HU0pIsW9 3n/cwILhWG8LIvft5tyouHzWh+/eZLhUYK1N32cE= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 3C8AA6081B Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=okaya@codeaurora.org From: Sinan Kaya To: linux-pci@vger.kernel.org, timur@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , Bjorn Helgaas , linux-kernel@vger.kernel.org (open list) Subject: [PATCH V2] PCI: Enable PASID when End-to-End TLP is supported by all bridges Date: Tue, 19 Jun 2018 22:14:46 -0400 Message-Id: <1529460886-23722-1-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP A PCIe endpoint carries the process address space identifier (PASID) in the TLP prefix as part of the memory read/write transaction. The address information in the TLP is relevant only for a given PASID context. An IOMMU takes PASID value and the address information from the TLP to look up the physical address in the system. If a bridge drops the TLP prefix, the translation agent can resolve the address to an incorrect location and cause data corruption. Prevent this condition by requiring End-to-End TLP prefix to be supported on the entire data path between the endpoint and the root port. Signed-off-by: Sinan Kaya --- drivers/pci/ats.c | 9 +++++++++ drivers/pci/probe.c | 17 +++++++++++++++++ include/linux/pci.h | 1 + include/uapi/linux/pci_regs.h | 1 + 4 files changed, 28 insertions(+) diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 4923a2a..e1b2e6d 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -268,6 +268,7 @@ EXPORT_SYMBOL_GPL(pci_reset_pri); int pci_enable_pasid(struct pci_dev *pdev, int features) { u16 control, supported; + struct pci_dev *bridge; int pos; if (WARN_ON(pdev->pasid_enabled)) @@ -277,6 +278,14 @@ int pci_enable_pasid(struct pci_dev *pdev, int features) if (!pos) return -EINVAL; + bridge = pci_upstream_bridge(pdev); + while (bridge) { + if (!bridge->eetlp_prefix) + return -EINVAL; + + bridge = pci_upstream_bridge(bridge); + } + pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV; diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index ac876e3..a7f7ac1 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2042,6 +2042,22 @@ static void pci_configure_ltr(struct pci_dev *dev) #endif } +static void pci_configure_eetlp_prefix(struct pci_dev *dev) +{ +#ifdef CONFIG_PCI_PASID + u32 cap; + + if (!pci_is_pcie(dev)) + return; + + pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); + if (!(cap & PCI_EXP_DEVCAP2_E2ETLP)) + return; + + dev->eetlp_prefix = 1; +#endif +} + static void pci_configure_device(struct pci_dev *dev) { struct hotplug_params hpp; @@ -2051,6 +2067,7 @@ static void pci_configure_device(struct pci_dev *dev) pci_configure_extended_tags(dev, NULL); pci_configure_relaxed_ordering(dev); pci_configure_ltr(dev); + pci_configure_eetlp_prefix(dev); memset(&hpp, 0, sizeof(hpp)); ret = pci_get_hp_params(dev, &hpp); diff --git a/include/linux/pci.h b/include/linux/pci.h index 340029b..cf88d47 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -350,6 +350,7 @@ struct pci_dev { unsigned int ltr_path:1; /* Latency Tolerance Reporting supported from root to here */ #endif + unsigned int eetlp_prefix:1; /* End-to-End TLP Prefix */ pci_channel_state_t error_state; /* Current connectivity state */ struct device dev; /* Generic device interface */ diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index 4da87e2..a617ab2 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -636,6 +636,7 @@ #define PCI_EXP_DEVCAP2_OBFF_MASK 0x000c0000 /* OBFF support mechanism */ #define PCI_EXP_DEVCAP2_OBFF_MSG 0x00040000 /* New message signaling */ #define PCI_EXP_DEVCAP2_OBFF_WAKE 0x00080000 /* Re-use WAKE# for OBFF */ +#define PCI_EXP_DEVCAP2_E2ETLP 0x00200000 /* End-to-End TLP Prefix */ #define PCI_EXP_DEVCTL2 40 /* Device Control 2 */ #define PCI_EXP_DEVCTL2_COMP_TIMEOUT 0x000f /* Completion Timeout Value */ #define PCI_EXP_DEVCTL2_COMP_TMOUT_DIS 0x0010 /* Completion Timeout Disable */