From patchwork Thu Apr 8 17:01:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12191875 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 D5520C43460 for ; Thu, 8 Apr 2021 17:01:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A709761131 for ; Thu, 8 Apr 2021 17:01:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232016AbhDHRBo (ORCPT ); Thu, 8 Apr 2021 13:01:44 -0400 Received: from ale.deltatee.com ([204.191.154.188]:35986 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231735AbhDHRBn (ORCPT ); Thu, 8 Apr 2021 13:01:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=EugEJORuNfKYxib8amib6C9kIoRqoLuOGNiTIuZWJdk=; b=hn1+91V79vpvzWUisb5hUlIXJe hIR9hVdFeErCFo8anx/Dd11S9LDvhApqOZpFrlKOWEIlPzT8+hkaqZdzokv3Ywc/a6dxTrpKUrklW ZgdqSiBJlCD6urMdCos/7hyLIJ9Qoz/IEmJVwYlTOfK3E5CJTi2tKFhOn7rLqcN18dT+456Oh/q6c 9uOhot8OO99GLsIwb46MlAR0uIQUNTIznNQeW/iVEfZ9M0ixc2osw6XEjAwlpmYx/N5IOvDAt7n/n eNlcoNN8CxYJngq1swrYnk+/9GpOfyew51PKywF+BYtm1wMQmYn2sOvZryM8+wbV/Nbgl23Cf+n14 TmvZ5cmA==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lUY26-0002Lm-Kj; Thu, 08 Apr 2021 11:01:31 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1lUY25-0002Ir-BL; Thu, 08 Apr 2021 11:01:29 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Stephen Bates , Christoph Hellwig , Dan Williams , Jason Gunthorpe , =?utf-8?q?Christian_K=C3=B6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Logan Gunthorpe Date: Thu, 8 Apr 2021 11:01:10 -0600 Message-Id: <20210408170123.8788-4-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210408170123.8788-1-logang@deltatee.com> References: <20210408170123.8788-1-logang@deltatee.com> MIME-Version: 1.0 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-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, sbates@raithlin.com, hch@lst.de, jgg@ziepe.ca, christian.koenig@amd.com, jhubbard@nvidia.com, ddutile@redhat.com, willy@infradead.org, daniel.vetter@ffwll.ch, jason@jlekstrand.net, dave.hansen@linux.intel.com, helgaas@kernel.org, dan.j.williams@intel.com, andrzej.jakowski@intel.com, dave.b.minturn@intel.com, jianxin.xiong@intel.com, ira.weiny@intel.com, robin.murphy@arm.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH 03/16] PCI/P2PDMA: Attempt to set map_type if it has not been set X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Attempt to find the mapping type for P2PDMA pages on the first DMA map attempt if it has not been done ahead of time. Previously, the mapping type was expected to be calculated ahead of time, but if pages are to come from userspace then there's no way to ensure the path was checked ahead of time. Signed-off-by: Logan Gunthorpe --- drivers/pci/p2pdma.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 473a08940fbc..2574a062a255 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -825,11 +825,18 @@ EXPORT_SYMBOL_GPL(pci_p2pmem_publish); static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct pci_dev *provider, struct pci_dev *client) { + enum pci_p2pdma_map_type ret; + if (!provider->p2pdma) return PCI_P2PDMA_MAP_NOT_SUPPORTED; - return xa_to_value(xa_load(&provider->p2pdma->map_types, - map_types_idx(client))); + ret = xa_to_value(xa_load(&provider->p2pdma->map_types, + map_types_idx(client))); + if (ret != PCI_P2PDMA_MAP_UNKNOWN) + return ret; + + return upstream_bridge_distance_warn(provider, client, NULL, + GFP_ATOMIC); } static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap, @@ -877,7 +884,6 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, case PCI_P2PDMA_MAP_BUS_ADDR: return __pci_p2pdma_map_sg(p2p_pgmap, dev, sg, nents); default: - WARN_ON_ONCE(1); return 0; } }