From patchwork Fri Jul 23 17:49:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12396685 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,URIBL_BLOCKED, 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 D648EC19F33 for ; Fri, 23 Jul 2021 17:51:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB5F860F02 for ; Fri, 23 Jul 2021 17:51:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232531AbhGWRK2 (ORCPT ); Fri, 23 Jul 2021 13:10:28 -0400 Received: from ale.deltatee.com ([204.191.154.188]:50900 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230172AbhGWRKG (ORCPT ); Fri, 23 Jul 2021 13:10:06 -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=3+NKDp2q/0zHzVVwq3INd+w6NURPV4dE2hTg9/0ITMI=; b=p5v2Ta39J/FMFArdqmG9hSG4dJ GVRjnEedIhEO1h1r5PxFM08gIBm2nd5NToaIWZ7khZNaAntYnBCZUWT0JxZdoSW9l1fdwLGQfi0X3 lbubJp9G7o8oDw/JDXbE/idqJCA1fHd/koaMSZyJUWEIAXuMnTNHuyqeQmpH1vtLOBamcAC/zV6XL 5FI4jeQ2Z+mEOnsWyzTxTyD6b5+Udusu7tJ0clJtv+ZswVDDZVA5y4XKO2x7PSA1AXTf4tKdtp/JU 4AxOqYl9AObVsclV8wS/PiUkaSSPgigS2efnAtBdAJWeCeYgFhDY5hULZaNiPuGhFkfmEfLJZJnwf 1AX9mNhw==; 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 1m6zJj-0005Li-J2; Fri, 23 Jul 2021 11:50:36 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1m6zJL-0005qk-5K; Fri, 23 Jul 2021 11:50:11 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, iommu@lists.linux-foundation.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org Cc: Christoph Hellwig , Marek Szyprowski , Robin Murphy , Stephen Bates , Martin Oliveira , Logan Gunthorpe , Richard Henderson , Ivan Kokshaysky , Matt Turner Date: Fri, 23 Jul 2021 11:49:52 -0600 Message-Id: <20210723175008.22410-6-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210723175008.22410-1-logang@deltatee.com> References: <20210723175008.22410-1-logang@deltatee.com> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, sbates@raithlin.com, martin.oliveira@eideticom.com, logang@deltatee.com, rth@twiddle.net, ink@jurassic.park.msu.ru, mattst88@gmail.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v2 05/21] alpha: return error code from alpha_pci_map_sg() 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-parisc@vger.kernel.org From: Martin Oliveira The .map_sg() op now expects an error code instead of zero on failure. pci_map_single_1() can fail for different reasons, but since the only supported type of error return is DMA_MAPPING_ERROR, we coalesce those errors into EIO. ENOMEM is returned when no page tables can be allocated. Signed-off-by: Martin Oliveira Signed-off-by: Logan Gunthorpe Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner --- arch/alpha/kernel/pci_iommu.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c index 35d7b3096d6e..21f9ac101324 100644 --- a/arch/alpha/kernel/pci_iommu.c +++ b/arch/alpha/kernel/pci_iommu.c @@ -649,7 +649,9 @@ static int alpha_pci_map_sg(struct device *dev, struct scatterlist *sg, sg->dma_address = pci_map_single_1(pdev, SG_ENT_VIRT_ADDRESS(sg), sg->length, dac_allowed); - return sg->dma_address != DMA_MAPPING_ERROR; + if (sg->dma_address == DMA_MAPPING_ERROR) + return -EIO; + return 1; } start = sg; @@ -685,8 +687,10 @@ static int alpha_pci_map_sg(struct device *dev, struct scatterlist *sg, if (out < end) out->dma_length = 0; - if (out - start == 0) + if (out - start == 0) { printk(KERN_WARNING "pci_map_sg failed: no entries?\n"); + return -ENOMEM; + } DBGA("pci_map_sg: %ld entries\n", out - start); return out - start; @@ -699,7 +703,7 @@ static int alpha_pci_map_sg(struct device *dev, struct scatterlist *sg, entries. Unmap them now. */ if (out > start) pci_unmap_sg(pdev, start, out - start, dir); - return 0; + return -ENOMEM; } /* Unmap a set of streaming mode DMA translations. Again, cpu read