From patchwork Thu Apr 7 15:46:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12805412 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BA88C433F5 for ; Thu, 7 Apr 2022 15:50:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3BDF18D0001; Thu, 7 Apr 2022 11:47:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EEF9B8D0005; Thu, 7 Apr 2022 11:47:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CF2628D0002; Thu, 7 Apr 2022 11:47:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0133.hostedemail.com [216.40.44.133]) by kanga.kvack.org (Postfix) with ESMTP id A7F268D0001 for ; Thu, 7 Apr 2022 11:47:58 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 6B55218391D74 for ; Thu, 7 Apr 2022 15:47:48 +0000 (UTC) X-FDA: 79330513416.30.1C07B0D Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) by imf24.hostedemail.com (Postfix) with ESMTP id B018518000A for ; Thu, 7 Apr 2022 15:47:46 +0000 (UTC) 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=ZRqXik+AbRLmYtJfL+C2eBMnrjpO8efYUeKCeHmi1ik=; b=Lm33E960X0HEggurxTc5ED8v5F ArL+/Y4Xsll2xJBwqN1YYJqdImLFWp4CkBPMrxv6eTaRnsDdmr+Y0+M+lB/K7jb6kW3D5XynL/hCI PfIFa5SsohA5CLAzbD/ckpTiJwC0Qqn3osjKuD0IdXmFvCzWRIOCGm5xSktfZ3VW6/jroF2E+fExE JyN2gczLjgxvDCXYBAeDx2i8i64aGV0p2CKHYfTZi5YERkT6weMeCOYKlRAcg3WfwcNZJYeNl7Kfi UBTutMHgzzmQOdcPnqCPWz7qM+lBMMxDGg22S0jMYCPhl8Sx/2RZXy8IzPqv2NwqSOTUEHpS3wgXm bKBsrcSQ==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ncUMH-002BBg-KW; Thu, 07 Apr 2022 09:47:43 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1ncUMB-00021K-G4; Thu, 07 Apr 2022 09:47:35 -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 , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Logan Gunthorpe , Bjorn Helgaas , Chaitanya Kulkarni Date: Thu, 7 Apr 2022 09:46:58 -0600 Message-Id: <20220407154717.7695-3-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220407154717.7695-1-logang@deltatee.com> References: <20220407154717.7695-1-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, 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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com, bhelgaas@google.com, jhubbard@nvidia.com, rcampbell@nvidia.com, kch@nvidia.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v6 02/21] PCI/P2PDMA: Attempt to set map_type if it has not been set X-SA-Exim-Version: 4.2.1 (built Sat, 13 Feb 2021 17:57:42 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-Stat-Signature: tpzyb9oye973nh8k1hb5q9kj4w5nw6cf Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=Lm33E960; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf24.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: B018518000A X-HE-Tag: 1649346466-870557 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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. This change will calculate the mapping type if it hasn't pre-calculated so it is no longer invalid to call pci_p2pdma_map_sg() before the mapping type is calculated, so drop the WARN_ON when that is the case. Signed-off-by: Logan Gunthorpe Acked-by: Bjorn Helgaas Reviewed-by: Chaitanya Kulkarni --- drivers/pci/p2pdma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 30b1df3c9d2f..c3a68e82cf36 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -849,6 +849,7 @@ static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider; struct pci_dev *client; struct pci_p2pdma *p2pdma; + int dist; if (!provider->p2pdma) return PCI_P2PDMA_MAP_NOT_SUPPORTED; @@ -865,6 +866,10 @@ static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, type = xa_to_value(xa_load(&p2pdma->map_types, map_types_idx(client))); rcu_read_unlock(); + + if (type == PCI_P2PDMA_MAP_UNKNOWN) + return calc_map_type_and_dist(provider, client, &dist, true); + return type; } @@ -907,7 +912,7 @@ 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); + /* Mapping is not Supported */ return 0; } }