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=-9.8 required=3.0 tests=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 11A66C41517 for ; Mon, 12 Aug 2019 17:31:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE1262067D for ; Mon, 12 Aug 2019 17:31:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727282AbfHLRbF (ORCPT ); Mon, 12 Aug 2019 13:31:05 -0400 Received: from ale.deltatee.com ([207.54.116.67]:37836 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727263AbfHLRbF (ORCPT ); Mon, 12 Aug 2019 13:31:05 -0400 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 1hxE9l-0002sZ-OI; Mon, 12 Aug 2019 11:31:03 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1hxE9j-0002PO-9o; Mon, 12 Aug 2019 11:30:51 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org Cc: Bjorn Helgaas , Christoph Hellwig , Christian Koenig , Jason Gunthorpe , Sagi Grimberg , Keith Busch , Jens Axboe , Dan Williams , Eric Pilmore , Stephen Bates , Logan Gunthorpe Date: Mon, 12 Aug 2019 11:30:40 -0600 Message-Id: <20190812173048.9186-7-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190812173048.9186-1-logang@deltatee.com> References: <20190812173048.9186-1-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-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, bhelgaas@google.com, hch@lst.de, Christian.Koenig@amd.com, jgg@mellanox.com, sagi@grimberg.me, kbusch@kernel.org, axboe@fb.com, dan.j.williams@intel.com, epilmore@gigaio.com, sbates@raithlin.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 06/14] PCI/P2PDMA: Factor out host_bridge_whitelist() 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-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Push both PCI devices into the whitelist checking function seeing some hardware will require us ensuring they are on the same host bridge. At the same time we rename root_complex_whitelist() to host_bridge_whitelist() to match the terminology used in the code. Link: https://lore.kernel.org/r/20190730163545.4915-7-logang@deltatee.com Signed-off-by: Logan Gunthorpe Signed-off-by: Bjorn Helgaas --- drivers/pci/p2pdma.c | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index f7f7e5862bab..4b9f0903b340 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -269,19 +269,11 @@ static void seq_buf_print_bus_devfn(struct seq_buf *buf, struct pci_dev *pdev) seq_buf_printf(buf, "%s;", pci_name(pdev)); } -/* - * If we can't find a common upstream bridge take a look at the root - * complex and compare it to a whitelist of known good hardware. - */ -static bool root_complex_whitelist(struct pci_dev *dev) +static bool __host_bridge_whitelist(struct pci_host_bridge *host) { - struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); struct pci_dev *root = pci_get_slot(host->bus, PCI_DEVFN(0, 0)); unsigned short vendor, device; - if (iommu_present(dev->dev.bus)) - return false; - if (!root) return false; @@ -296,6 +288,24 @@ static bool root_complex_whitelist(struct pci_dev *dev) return false; } +/* + * If we can't find a common upstream bridge take a look at the root + * complex and compare it to a whitelist of known good hardware. + */ +static bool host_bridge_whitelist(struct pci_dev *a, struct pci_dev *b) +{ + struct pci_host_bridge *host_a = pci_find_host_bridge(a->bus); + struct pci_host_bridge *host_b = pci_find_host_bridge(b->bus); + + if (iommu_present(a->dev.bus) || iommu_present(b->dev.bus)) + return false; + + if (__host_bridge_whitelist(host_a) && __host_bridge_whitelist(host_b)) + return true; + + return false; +} + static enum pci_p2pdma_map_type __upstream_bridge_distance(struct pci_dev *provider, struct pci_dev *client, int *dist, bool *acs_redirects, struct seq_buf *acs_list) @@ -418,8 +428,7 @@ upstream_bridge_distance(struct pci_dev *provider, struct pci_dev *client, acs_redirects, acs_list); if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) { - if (!root_complex_whitelist(provider) || - !root_complex_whitelist(client)) + if (!host_bridge_whitelist(provider, client)) return PCI_P2PDMA_MAP_NOT_SUPPORTED; } -- 2.20.1