From patchwork Thu Feb 29 07:20:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13576727 Received: from out30-100.freemail.mail.aliyun.com (out30-100.freemail.mail.aliyun.com [115.124.30.100]) (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 1804156B72; Thu, 29 Feb 2024 07:21:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.100 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709191280; cv=none; b=nRNutN3QXZ1ZVCqjTuMuweSZnbImPexTRuHZn+Wrijk41EMGrc3bGpRs6UGKT9QUtRFodNFhMe0qol2LgA7rHakYYxzatmK+yCHPwbe9Dd8cAHTCxSrnf4mqWQadMoExMc1lzFYc14AHZCQSKXPzT0HPRzJHgGtUUMKftDPzEOM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709191280; c=relaxed/simple; bh=nufMRbXLj+YSuSWmljSpMKFk1LTW93GH2wujXElJyos=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cWWOXQ0F8ekx62nygxp5E4lTkEQF3wf4w7oQxFtnelhcbQX8QXj1Q2Zt+MlaveWC/TVH2x2Y5OxQ/yzYNVWYX9FgLB2a1tIiKvJcRpxjTpDrjwx1uKP8O16LrIG+XrjLLRkXsRn4adnpTXMzgV7dy0WR7f0HON67bRI5hs6NP48= 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=RaA8AsD4; arc=none smtp.client-ip=115.124.30.100 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="RaA8AsD4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1709191275; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=d8VgurjiHoufBNHjBHr2ztXStBXU+RItFeIKBycQigI=; b=RaA8AsD4XFUI3H1+kM//zJQd124GKDGOJ6u0o79ljEJ3RAxx3KthiDlqnBkXp473svyns+/d/HzTEalaTSviTWSMbiUqJi5We9T7G9y7Hprj/eD6gjXoeQp5Ains/8SCgkiMuAqEBOSBlzYYAyxOPGSCWMYWt/pZ1OaJfvq+yP8= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R661e4;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_---0W1SBcCO_1709191270; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W1SBcCO_1709191270) by smtp.aliyun-inc.com; Thu, 29 Feb 2024 15:21:11 +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 v3 16/19] virtio_ring: introduce virtqueue_dma_map_sg_attrs Date: Thu, 29 Feb 2024 15:20:41 +0800 Message-Id: <20240229072044.77388-17-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240229072044.77388-1-xuanzhuo@linux.alibaba.com> References: <20240229072044.77388-1-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: e3a3e51d6b70 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,