From patchwork Tue Feb 19 19:06:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 10820615 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-2.web.codeaurora.org (Postfix) with ESMTP id 18FE51390 for ; Tue, 19 Feb 2019 19:07:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0A36A29E5F for ; Tue, 19 Feb 2019 19:07:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F24952B268; Tue, 19 Feb 2019 19:07:56 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham 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 9FA9129E5F for ; Tue, 19 Feb 2019 19:07:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729629AbfBSTHv (ORCPT ); Tue, 19 Feb 2019 14:07:51 -0500 Received: from mga01.intel.com ([192.55.52.88]:6001 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726323AbfBSTHu (ORCPT ); Tue, 19 Feb 2019 14:07:50 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Feb 2019 11:07:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,388,1544515200"; d="scan'208";a="125645936" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga008.fm.intel.com with ESMTP; 19 Feb 2019 11:07:49 -0800 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com, joro@8bytes.org, dwmw2@infradead.org Cc: linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, jacob.jun.pan@intel.com, keith.busch@intel.com, Jacob Pan , Kuppuswamy Sathyanarayanan Subject: [PATCH v3 2/2] iommu/vt-d: Enable ATS only if the device uses page aligned address. Date: Tue, 19 Feb 2019 11:06:10 -0800 Message-Id: <8717cf27996937ad7681005cd7b99c303c229b84.1550602392.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: 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 From: Kuppuswamy Sathyanarayanan As per Intel vt-d specification, Rev 3.0 (section 7.5.1.1, title "Page Request Descriptor"), Intel IOMMU page request descriptor only uses bits[63:12] of the page address. Hence Intel IOMMU driver would only permit devices that advertise they would only send Page Aligned Requests to participate in ATS service. Cc: Ashok Raj Cc: Jacob Pan Cc: Keith Busch Suggested-by: Ashok Raj Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/iommu/intel-iommu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 78188bf7e90d..bb0e244a0117 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1406,6 +1406,7 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info) info->pri_enabled = 1; #endif if (!pdev->untrusted && info->ats_supported && + pci_ats_page_aligned(pdev) && !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) { info->ats_enabled = 1; domain_update_iotlb(info->domain);