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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 63094C433EF for ; Wed, 15 Jun 2022 16:14:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Subject: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date :Cc:To:From:Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dDcdCEaWGv/l2098gGlW8wOT/rK8fbKH3lNyefLy2uU=; b=ZHrT0tP7a2G10oSUcQdAq7UB8L Unjp8k88HqxzKzYTHbPx21S0qSM9L7Luy3AOHWSsy7ZM8RZLnaFCN49oc1L+kyz6wqlkzqAP650O1 Tm7MPDoVWGtkxPTgifX2FG+3ixeOAOoDdoLVxAptpsMzAgKL/iZX4DLUBkpagRpHD3WHgaG1/LQg/ IM6SU/1ieGzJNfAGOtk4MOUfXkVbtRa/kC0e05nSyE1xzDZn/Jwn3lsGK6B8Go3W/PL2fReh49CvY SXKASV7N6R+G9IBL2RYR5nfu8Ww6Cm21Il5DrajkuWIucnCX6XZTu3pS69Df4S3uXnSy10pGFoAn8 1ROqKUCA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1Veo-00FKet-5R; Wed, 15 Jun 2022 16:14:14 +0000 Received: from ale.deltatee.com ([204.191.154.188]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1VdU-00FJYL-M6 for linux-nvme@lists.infradead.org; Wed, 15 Jun 2022 16:12:57 +0000 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=dDcdCEaWGv/l2098gGlW8wOT/rK8fbKH3lNyefLy2uU=; b=jrRPehtQjnwFT9fc0jh95GHygA bdV8reEzaqp9WJZ335mwCqqfi7aKzHcfq44yZsd+aV9wUibpB3xBhAto5o+j6yvnirP4cGWR5S39p 0XfCIhvUgy9ESkAaN7jtBYdJQNfWBEHDDPdl/8tgme6cpP+30ZChoOIeNm3TjGjCxU6KnwuMf+AIW edsKz20JAl61eh+aPomqwRmCKt2oCpdHuAQot81N38CC2l2BwtrnjKP6eBsiZLBKhti56rrEZNJ9R v7voaboUX7kQV65eKr7anMUK+TplynbGqVV1EGTf3xAGIrx9t9dWVp/Gjh2UDf62QHfpf5SloTH4v ZZm2jk8w==; 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 1o1VdN-0084iR-L8; Wed, 15 Jun 2022 10:12:47 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1o1VdG-0004Zu-Ul; Wed, 15 Jun 2022 10:12:38 -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=20K=C3=B6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , 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: Wed, 15 Jun 2022 10:12:14 -0600 Message-Id: <20220615161233.17527-3-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220615161233.17527-1-logang@deltatee.com> References: <20220615161233.17527-1-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-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, 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 v7 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220615_091252_826378_24B5B12A X-CRM114-Status: GOOD ( 13.49 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.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. 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 462b429ad243..4e8bc457e29a 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -854,6 +854,7 @@ 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; @@ -870,6 +871,10 @@ 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; } @@ -912,7 +917,7 @@ 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; } } -- 2.30.2