From patchwork Thu Mar 11 23:31:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12133257 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 F03A9C433E0 for ; Thu, 11 Mar 2021 23:32:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7FFB664F92 for ; Thu, 11 Mar 2021 23:32:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7FFB664F92 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=deltatee.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id F16068D0312; Thu, 11 Mar 2021 18:32:11 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id EEEA68D030D; Thu, 11 Mar 2021 18:32:11 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C7E498D0312; Thu, 11 Mar 2021 18:32:11 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0097.hostedemail.com [216.40.44.97]) by kanga.kvack.org (Postfix) with ESMTP id 9AA618D030D for ; Thu, 11 Mar 2021 18:32:11 -0500 (EST) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 4FBCC6C02 for ; Thu, 11 Mar 2021 23:32:11 +0000 (UTC) X-FDA: 77909194062.13.06B19B8 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) by imf17.hostedemail.com (Postfix) with ESMTP id D66B8407F8F8 for ; Thu, 11 Mar 2021 23:32:09 +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=KOMMXadwrYwZEB6tWYvcMS2uWikbMkq234oR8x5l6uU=; b=NOigEiKa5QVhqkJx08sL74oozH IZ3CiU8+eeNi0GWrmCuxBvytyQml8bVvak4gI55pcE2jXr1VSHIoSsjrWGiFBqneKdlc/tREjEfQK vpBhsUQYflR8mj4rh+OgbyUcpWwHvWJro43CV02zDTEMELz51KCyW4YJ1HEQ5aT++Wx4fWd0e2UIz 1Fdm889jVbolaeVeZCD1GDvmPKyUJzpB3kfWPtbn3sTqKbzNUDsxzF+bTniILfxZ6v1Lj6Izgqeej bn38QX113rFGYQkNk83OpSUc66XivY5TKSYhkyr9Yr5OB+kx3ZkOj25E4nbNn9vcglbG8mk4sRFr+ 74XDjSSA==; 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 1lKUmm-0003ev-8M; Thu, 11 Mar 2021 16:32:09 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1lKUmW-00024e-Lc; Thu, 11 Mar 2021 16:31:52 -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?= , Ira Weiny , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Logan Gunthorpe Date: Thu, 11 Mar 2021 16:31:37 -0700 Message-Id: <20210311233142.7900-8-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210311233142.7900-1-logang@deltatee.com> References: <20210311233142.7900-1-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, dan.j.williams@intel.com, iweiny@intel.com, andrzej.jakowski@intel.com, dave.b.minturn@intel.com, jianxin.xiong@intel.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [RFC PATCH v2 07/11] dma-mapping: Add flags to dma_map_ops to indicate PCI P2PDMA support 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) X-Stat-Signature: ehisj9ur91hrh4sm8r5fq9mtb8iwosgy X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D66B8407F8F8 Received-SPF: none (deltatee.com>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from=""; helo=ale.deltatee.com; client-ip=204.191.154.188 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615505529-861199 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: Add a flags member to the dma_map_ops structure with one flag to indicate support for PCI P2PDMA. Also, add a helper to check if a device supports PCI P2PDMA. Signed-off-by: Logan Gunthorpe --- include/linux/dma-map-ops.h | 3 +++ include/linux/dma-mapping.h | 5 +++++ kernel/dma/mapping.c | 8 ++++++++ 3 files changed, 16 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 51872e736e7b..481892822104 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -12,6 +12,9 @@ struct cma; struct dma_map_ops { + unsigned int flags; +#define DMA_F_PCI_P2PDMA_SUPPORTED (1 << 0) + void *(*alloc)(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 2a984cb4d1e0..a6bced004de8 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -138,6 +138,7 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, unsigned long attrs); bool dma_can_mmap(struct device *dev); int dma_supported(struct device *dev, u64 mask); +int dma_pci_p2pdma_supported(struct device *dev); int dma_set_mask(struct device *dev, u64 mask); int dma_set_coherent_mask(struct device *dev, u64 mask); u64 dma_get_required_mask(struct device *dev); @@ -233,6 +234,10 @@ static inline int dma_supported(struct device *dev, u64 mask) { return 0; } +static inline int dma_pci_p2pdma_supported(struct device *dev) +{ + return 0; +} static inline int dma_set_mask(struct device *dev, u64 mask) { return -EIO; diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index adc1a83950be..cc1b97deb74d 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -540,6 +540,14 @@ int dma_supported(struct device *dev, u64 mask) } EXPORT_SYMBOL(dma_supported); +int dma_pci_p2pdma_supported(struct device *dev) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED; +} +EXPORT_SYMBOL(dma_pci_p2pdma_supported); + #ifdef CONFIG_ARCH_HAS_DMA_SET_MASK void arch_dma_set_mask(struct device *dev, u64 mask); #else