From patchwork Wed Jun 29 06:56:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12899435 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3544ACCA487 for ; Wed, 29 Jun 2022 06:57:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232599AbiF2G5m (ORCPT ); Wed, 29 Jun 2022 02:57:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231998AbiF2G5Y (ORCPT ); Wed, 29 Jun 2022 02:57:24 -0400 Received: from out30-43.freemail.mail.aliyun.com (out30-43.freemail.mail.aliyun.com [115.124.30.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6AC3D31340; Tue, 28 Jun 2022 23:57:21 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R641e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VHmY1Cw_1656485833; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHmY1Cw_1656485833) by smtp.aliyun-inc.com; Wed, 29 Jun 2022 14:57:15 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , Mark Gross , 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 , Xuan Zhuo , Vincent Whitchurch , 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, kangjie.xu@linux.alibaba.com Subject: [PATCH v11 08/40] virtio_ring: split: extract the logic of alloc queue Date: Wed, 29 Jun 2022 14:56:24 +0800 Message-Id: <20220629065656.54420-9-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220629065656.54420-1-xuanzhuo@linux.alibaba.com> References: <20220629065656.54420-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 3fdaf102dd89 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Separate the logic of split to create vring queue. This feature is required for subsequent virtuqueue reset vring. Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 68 ++++++++++++++++++++++-------------- 1 file changed, 42 insertions(+), 26 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 49d61e412dc6..a9ceb9c16c54 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -949,28 +949,19 @@ static void vring_free_split(struct vring_virtqueue_split *vring, kfree(vring->desc_extra); } -static struct virtqueue *vring_create_virtqueue_split( - unsigned int index, - unsigned int num, - unsigned int vring_align, - struct virtio_device *vdev, - bool weak_barriers, - bool may_reduce_num, - bool context, - bool (*notify)(struct virtqueue *), - void (*callback)(struct virtqueue *), - const char *name) +static int vring_alloc_queue_split(struct vring_virtqueue_split *vring, + struct virtio_device *vdev, + u32 num, + unsigned int vring_align, + bool may_reduce_num) { - struct virtqueue *vq; void *queue = NULL; dma_addr_t dma_addr; - size_t queue_size_in_bytes; - struct vring vring; /* We assume num is a power of 2. */ if (num & (num - 1)) { dev_warn(&vdev->dev, "Bad virtqueue length %u\n", num); - return NULL; + return -EINVAL; } /* TODO: allocate each queue chunk individually */ @@ -981,11 +972,11 @@ static struct virtqueue *vring_create_virtqueue_split( if (queue) break; if (!may_reduce_num) - return NULL; + return -ENOMEM; } if (!num) - return NULL; + return -ENOMEM; if (!queue) { /* Try to get a single page. You are my only hope! */ @@ -993,21 +984,46 @@ static struct virtqueue *vring_create_virtqueue_split( &dma_addr, GFP_KERNEL|__GFP_ZERO); } if (!queue) - return NULL; + return -ENOMEM; + + vring_init(&vring->vring, num, queue, vring_align); - queue_size_in_bytes = vring_size(num, vring_align); - vring_init(&vring, num, queue, vring_align); + vring->queue_dma_addr = dma_addr; + vring->queue_size_in_bytes = vring_size(num, vring_align); + + return 0; +} + +static struct virtqueue *vring_create_virtqueue_split( + unsigned int index, + unsigned int num, + unsigned int vring_align, + struct virtio_device *vdev, + bool weak_barriers, + bool may_reduce_num, + bool context, + bool (*notify)(struct virtqueue *), + void (*callback)(struct virtqueue *), + const char *name) +{ + struct vring_virtqueue_split vring = {}; + struct virtqueue *vq; + int err; + + err = vring_alloc_queue_split(&vring, vdev, num, vring_align, + may_reduce_num); + if (err) + return NULL; - vq = __vring_new_virtqueue(index, vring, vdev, weak_barriers, context, - notify, callback, name); + vq = __vring_new_virtqueue(index, vring.vring, vdev, weak_barriers, + context, notify, callback, name); if (!vq) { - vring_free_queue(vdev, queue_size_in_bytes, queue, - dma_addr); + vring_free_split(&vring, vdev); return NULL; } - to_vvq(vq)->split.queue_dma_addr = dma_addr; - to_vvq(vq)->split.queue_size_in_bytes = queue_size_in_bytes; + to_vvq(vq)->split.queue_dma_addr = vring.queue_dma_addr; + to_vvq(vq)->split.queue_size_in_bytes = vring.queue_size_in_bytes; to_vvq(vq)->we_own_ring = true; return vq;