From patchwork Fri Feb 2 09:39:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13542555 Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (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 ECD667E769; Fri, 2 Feb 2024 09:40:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.132 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706866825; cv=none; b=tIQrpXg67ph9RAGgQ0+N6YBbKA00pfb0zrm9cae66ZIwzP2zP11dkX9MzWiO5qD6Ci52T7e7OAH2ydH2YaIWFfTqS41JkwH4KXYyfe9ueEQFFfEXBeZ9WHAF4wZqLBfBpjtsc6/y20KjB28CleEtKmytLmk8xpYASmk0XVH0Jgs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706866825; c=relaxed/simple; bh=NNM9tWQnMQInuiN94nJotBSG7mda/K1Qh7QCalmDDpE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BIBTxTS2VLjZ6pPzLIoP/gi8IxK1VXOm3JnER/EDsMwNkuv7V82PgJjfmHOwF5cM+zbXhN2z+BT2x96lQTwzuKXzu6a62AFKVPCxDZ8wnPFjQt8N6IU1xokPL+LYY0uOFZQNmPtLuGHa6OxXVN9jpeGHpHqgx00OUmvsBcAflTM= 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=GmGKGy2r; arc=none smtp.client-ip=115.124.30.132 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="GmGKGy2r" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1706866820; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=szqnWCRY+3t7jHL1CQv9OY3Vs1PE98SAQIcyewZeW44=; b=GmGKGy2rNGNmJp1Y6WVGjBxmTW78AbCxSAQCnuf/GuQ0U1EUr0ufhj7OQHzGTRLvHKyAuwrfIm3KrpdDCdkGTW4tx+j5txFYpgAS8aJ2zrT7XC+LtEgdQaxRBgCyMyP3LgefqmsIEZ5gEyOqPDR5sbS0NzKYGk/OyynHiHhepRI= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046051;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=36;SR=0;TI=SMTPD_---0W.wiMVl_1706866816; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W.wiMVl_1706866816) by smtp.aliyun-inc.com; Fri, 02 Feb 2024 17:40:17 +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 , Benjamin Berg , 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 v1 15/19] virtio_ring: introduce dma map api for page Date: Fri, 2 Feb 2024 17:39:47 +0800 Message-Id: <20240202093951.120283-16-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240202093951.120283-1-xuanzhuo@linux.alibaba.com> References: <20240202093951.120283-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 4c7bacd05cb8 The virtio-net sq will use these APIs to map the scatterlist. For scatterlist, the page dma APIs are more appropriate. dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page, size_t offset, size_t size, enum dma_data_direction dir, unsigned long attrs); void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs); Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 52 ++++++++++++++++++++++++++++++++++++ include/linux/virtio.h | 7 +++++ 2 files changed, 59 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 57b669180e6e..79868967a676 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -3117,6 +3117,58 @@ void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr, } EXPORT_SYMBOL_GPL(virtqueue_dma_unmap_single_attrs); +/** + * virtqueue_dma_map_page_attrs - map DMA for _vq + * @_vq: the struct virtqueue we're talking about. + * @page: the page to do dma + * @offset: the offset inside the page + * @size: the size of the page to do dma + * @dir: DMA direction + * @attrs: DMA Attrs + * + * The caller calls this to do dma mapping in advance. The DMA address can be + * passed to this _vq when it is in pre-mapped mode. + * + * return DMA address. Caller should check that by virtqueue_dma_mapping_error(). + */ +dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page, + size_t offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + if (!vq->use_dma_api) + return page_to_phys(page) + offset; + + return dma_map_page_attrs(vring_dma_dev(vq), page, offset, size, dir, attrs); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_map_page_attrs); + +/** + * virtqueue_dma_unmap_page_attrs - unmap DMA for _vq + * @_vq: the struct virtqueue we're talking about. + * @addr: the dma address to unmap + * @size: the size of the buffer + * @dir: DMA direction + * @attrs: DMA Attrs + * + * Unmap the address that is mapped by the virtqueue_dma_map_* APIs. + * + */ +void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + if (!vq->use_dma_api) + return; + + dma_unmap_page_attrs(vring_dma_dev(vq), addr, size, dir, attrs); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_unmap_page_attrs); + /** * virtqueue_dma_mapping_error - check dma address * @_vq: the struct virtqueue we're talking about. diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 7f16bacc6c49..8a8d282982ad 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -216,6 +216,13 @@ dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr, size void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs); +dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page, + size_t offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs); +void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs); int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr); bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr);