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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 E4067C282CE for ; Wed, 13 Feb 2019 17:55:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B9D3F2086C for ; Wed, 13 Feb 2019 17:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404484AbfBMRzJ (ORCPT ); Wed, 13 Feb 2019 12:55:09 -0500 Received: from ale.deltatee.com ([207.54.116.67]:54660 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393507AbfBMRzI (ORCPT ); Wed, 13 Feb 2019 12:55:08 -0500 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gtykN-0001z9-9W; Wed, 13 Feb 2019 10:55:06 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1gtykL-0001y6-7z; Wed, 13 Feb 2019 10:54:57 -0700 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-ntb@googlegroups.com, linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kselftest@vger.kernel.org, Jon Mason , Bjorn Helgaas , Joerg Roedel Cc: Allen Hubbe , Dave Jiang , Serge Semin , Eric Pilmore , Logan Gunthorpe , David Woodhouse , Jacob Pan Date: Wed, 13 Feb 2019 10:54:45 -0700 Message-Id: <20190213175454.7506-4-logang@deltatee.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20190213175454.7506-1-logang@deltatee.com> References: <20190213175454.7506-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-ntb@googlegroups.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-kselftest@vger.kernel.org, jdmason@kudzu.us, bhelgaas@google.com, joro@8bytes.org, dave.jiang@intel.com, allenbh@gmail.com, fancer.lancer@gmail.com, epilmore@gigaio.com, logang@deltatee.com, dwmw2@infradead.org, jacob.jun.pan@linux.intel.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v2 03/12] iommu/vt-d: Add helper to set an IRTE to verify only the bus number X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The current code uses set_irte_sid() with SVT_VERIFY_BUS and PCI_DEVID to set the SID value. However, this is very confusing because, with SVT_VERIFY_BUS, the SID value is not a PCI devfn address, but the start and end bus numbers to match against. According to the Intel Virtualization Technology for Directed I/O Architecture Specification, Rev. 3.0, page 9-36: The most significant 8-bits of the SID field contains the Startbus#, and the least significant 8-bits of the SID field contains the Endbus#. Interrupt requests that reference this IRTE must have a requester-id whose bus# (most significant 8-bits of requester-id) has a value equal to or within the Startbus# to Endbus# range. So to make this more clear, introduce a new set_irte_verify_bus() that explicitly takes a start bus and end bus so that we can stop abusing the PCI_DEVID macro. This helper function will be called a second time in an subsequent patch. Signed-off-by: Logan Gunthorpe Cc: David Woodhouse Cc: Joerg Roedel Cc: Jacob Pan --- drivers/iommu/intel_irq_remapping.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 24d45b07f425..5a55bef8e379 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -294,6 +294,18 @@ static void set_irte_sid(struct irte *irte, unsigned int svt, irte->sid = sid; } +/* + * Set an IRTE to match only the bus number. Interrupt requests that reference + * this IRTE must have a requester-id whose bus number is between or equal + * to the start_bus and end_bus arguments. + */ +static void set_irte_verify_bus(struct irte *irte, unsigned int start_bus, + unsigned int end_bus) +{ + set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16, + (start_bus << 8) | end_bus); +} + static int set_ioapic_sid(struct irte *irte, int apic) { int i; @@ -391,9 +403,8 @@ static int set_msi_sid(struct irte *irte, struct pci_dev *dev) * original device. */ if (PCI_BUS_NUM(data.alias) != data.pdev->bus->number) - set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16, - PCI_DEVID(PCI_BUS_NUM(data.alias), - dev->bus->number)); + set_irte_verify_bus(irte, PCI_BUS_NUM(data.alias), + dev->bus->number); else if (data.pdev->bus->number != dev->bus->number) set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, data.alias); else -- 2.19.0