From patchwork Wed Nov 17 21:53:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12625503 X-Patchwork-Delegate: bhelgaas@google.com 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94A1EC4321E for ; Wed, 17 Nov 2021 21:54:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 75F3C6152B for ; Wed, 17 Nov 2021 21:54:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240993AbhKQV5j (ORCPT ); Wed, 17 Nov 2021 16:57:39 -0500 Received: from ale.deltatee.com ([204.191.154.188]:58876 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240924AbhKQV52 (ORCPT ); Wed, 17 Nov 2021 16:57:28 -0500 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=3aZ2AYK60CEaIE70gWhhj4/fir+nnPw5quNT7e3qCog=; b=NJEPejp0LpTJMPJAQBDQ1MYs1+ 3UL1xqlHQNFve4AhubcfvJKHkXFRnbIFuwZ8T2e1///MP9tlXlO+pNXwRGzqvcbNPNKG4mNp/jios Q83WLonVf6I8Rsgwt3nmUmvdLiZ9bkPYSIxdIhcuIg8oUL71wZh4T6i412CYWLfvGDfmjM96tej1y /7oe4Y7hqf+VYC2Uo+9Oq0Ec8U78z6glajffd7td9yLaKsDHcdY6E5m1ST+5YQH32wUItt0YxBvkx b++3RG4kf7n8gFxLoWSWWwW+IiIORy8KMkFbkAFplbYybYTd7KzFgDj8DXHUJxwJKJ4bxEEixnMKk oLyUObBQ==; 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 1mnSsr-000Zo3-Jf; Wed, 17 Nov 2021 14:54:27 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mnSsi-0000z4-N4; Wed, 17 Nov 2021 14:54:16 -0700 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 , Logan Gunthorpe , Jason Gunthorpe Date: Wed, 17 Nov 2021 14:53:53 -0700 Message-Id: <20211117215410.3695-7-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211117215410.3695-1-logang@deltatee.com> References: <20211117215410.3695-1-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, jhubbard@nvidia.com, jgg@nvidia.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v4 06/23] dma-mapping: allow EREMOTEIO return code for P2PDMA transfers 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) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add EREMOTEIO error return to dma_map_sgtable() which will be used by .map_sg() implementations that detect P2PDMA pages that the underlying DMA device cannot access. Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe --- kernel/dma/mapping.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 9478eccd1c8e..c056a1468189 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -197,7 +197,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, if (ents > 0) debug_dma_map_sg(dev, sg, nents, ents, dir, attrs); else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM && - ents != -EIO)) + ents != -EIO && ents != -EREMOTEIO)) return -EIO; return ents; @@ -255,6 +255,8 @@ EXPORT_SYMBOL(dma_map_sg_attrs); * complete the mapping. Should succeed if retried later. * -EIO Legacy error code with an unknown meaning. eg. this is * returned if a lower level call returned DMA_MAPPING_ERROR. + * -EREMOTEIO The DMA device cannot access P2PDMA memory specified in + * the sg_table. This will not succeed if retried. */ int dma_map_sgtable(struct device *dev, struct sg_table *sgt, enum dma_data_direction dir, unsigned long attrs)