From patchwork Fri Feb 23 08:27:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13568676 Received: from out30-98.freemail.mail.aliyun.com (out30-98.freemail.mail.aliyun.com [115.124.30.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B38546450; Fri, 23 Feb 2024 08:27:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.98 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708676880; cv=none; b=El4/N+EHxZCEH5OgUEE3Cbpo4/WMF4rlqZ6rWsJqjjeliPxiakpNvXSSgI3WOso939ETciWd/BJZoSncPrKY4I2+yVq1muyIrvb1LeHgFlR6wyeCfmRpcwpXBen5Mfo3S2cpcDka0UVyk6IA43hO5iySzRzqsE3ZFXgFbkDMTQA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708676880; c=relaxed/simple; bh=nufMRbXLj+YSuSWmljSpMKFk1LTW93GH2wujXElJyos=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Pwt95NDEqsFjPNvJsv3ZpZTIyGt0HymAIhXP2EQfIkG3sPzDNhvhWLX53iNAB7Is5qdqrLLvSxIoJNSKA2HHsMQj8UlWOwJIEAHYhCO7pRNGyBTjTBjpg9u2GO7yrvz8+Rd5X2GN/LHtsbm7uhaaeCvHktl3uZoocRgRKkJveGk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=k2jgJx0w; arc=none smtp.client-ip=115.124.30.98 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="k2jgJx0w" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1708676874; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=d8VgurjiHoufBNHjBHr2ztXStBXU+RItFeIKBycQigI=; b=k2jgJx0wTKh22ktOdbDtoHvLiNlH2OR1X3oXOr142XHFAX3d6XsvfTuAwyIfdKTQGlSPlrkwpumDtp9Gldfl8C7Yb95G1bZ5nQ46IAx/ZpD6pfoQL9n/tYR8bVje0FAS9IvaWEC47NHJv0/mTFi3zFyiRGKpvIWLTfv/IB1WSWQ= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046049;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=35;SR=0;TI=SMTPD_---0W13gVCV_1708676871; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W13gVCV_1708676871) by smtp.aliyun-inc.com; Fri, 23 Feb 2024 16:27:52 +0800 From: Xuan Zhuo To: virtualization@lists.linux.dev Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH vhost v2 16/19] virtio_ring: introduce virtqueue_dma_map_sg_attrs Date: Fri, 23 Feb 2024 16:27:23 +0800 Message-Id: <20240223082726.52915-17-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> References: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 510995f33855 Introduce a helper to do dma map for scatterlist. That can be used by other drivers. Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 32 ++++++++++++++++++++++++++++++++ include/linux/virtio.h | 3 +++ 2 files changed, 35 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index df7633155558..3f790fa3d56a 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -3187,6 +3187,38 @@ int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr) } EXPORT_SYMBOL_GPL(virtqueue_dma_mapping_error); +/** + * virtqueue_dma_map_sg_attrs - map scatterlist addr DMA for _vq + * @_vq: the struct virtqueue we're talking about. + * @sg: the scatterlist to do dma + * @dir: DMA direction + * @attrs: DMA Attrs + * + * The caller calls this to do dma mapping in advance. The sg can be + * passed to this _vq when it is in pre-mapped mode. + * + * Returns zero or a negative error. + * 0: success + * -ENOMEM: dma map error + */ +int virtqueue_dma_map_sg_attrs(struct virtqueue *_vq, struct scatterlist *sg, + enum dma_data_direction dir, unsigned long attrs) +{ + dma_addr_t addr; + int err; + + addr = virtqueue_dma_map_page_attrs(_vq, sg_page(sg), sg->offset, + sg->length, dir, attrs); + err = virtqueue_dma_mapping_error(_vq, addr); + if (err) + return err; + + sg->dma_address = addr; + + return 0; +} +EXPORT_SYMBOL_GPL(virtqueue_dma_map_sg_attrs); + /** * virtqueue_dma_need_sync - check a dma address needs sync * @_vq: the struct virtqueue we're talking about. diff --git a/include/linux/virtio.h b/include/linux/virtio.h index b81b93b3eb27..5027eba82fda 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -233,6 +233,9 @@ void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, unsigned long attrs); int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr); +int virtqueue_dma_map_sg_attrs(struct virtqueue *_vq, struct scatterlist *sg, + enum dma_data_direction dir, unsigned long attrs); + bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr); void virtqueue_dma_sync_single_range_for_cpu(struct virtqueue *_vq, dma_addr_t addr, unsigned long offset, size_t size,