From patchwork Wed Jul 20 03:04:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12923371 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 A6C25CCA487 for ; Wed, 20 Jul 2022 03:05:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241701AbiGTDFt (ORCPT ); Tue, 19 Jul 2022 23:05:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35814 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240971AbiGTDFR (ORCPT ); Tue, 19 Jul 2022 23:05:17 -0400 Received: from out30-57.freemail.mail.aliyun.com (out30-57.freemail.mail.aliyun.com [115.124.30.57]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65224481F2; Tue, 19 Jul 2022 20:04:58 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;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_---0VJuyeD2_1658286290; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VJuyeD2_1658286290) by smtp.aliyun-inc.com; Wed, 20 Jul 2022 11:04:52 +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 v12 06/40] virtio_ring: introduce virtqueue_init() Date: Wed, 20 Jul 2022 11:04:02 +0800 Message-Id: <20220720030436.79520-7-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220720030436.79520-1-xuanzhuo@linux.alibaba.com> References: <20220720030436.79520-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 366032b2ffac Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Separate the logic of virtqueue initialization. This logic is irrelevant to ring layout. This logic can be called independently when implementing resize/reset later. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/virtio/virtio_ring.c | 61 ++++++++++++++++++------------------ 1 file changed, 31 insertions(+), 30 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 1bc5794e9739..87ce17562b29 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -368,6 +368,34 @@ static int vring_mapping_error(const struct vring_virtqueue *vq, return dma_mapping_error(vring_dma_dev(vq), addr); } +static void virtqueue_init(struct vring_virtqueue *vq, u32 num) +{ + struct virtio_device *vdev; + + vdev = vq->vq.vdev; + + vq->vq.num_free = num; + if (vq->packed_ring) + vq->last_used_idx = 0 | (1 << VRING_PACKED_EVENT_F_WRAP_CTR); + else + vq->last_used_idx = 0; + vq->event_triggered = false; + vq->num_added = 0; + vq->use_dma_api = vring_use_dma_api(vdev); +#ifdef DEBUG + vq->in_use = false; + vq->last_add_time_valid = false; +#endif + + vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); + + if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM)) + vq->weak_barriers = false; + + /* Put everything in free lists. */ + vq->free_head = 0; +} + /* * Split ring specific functions - *_split(). @@ -1706,7 +1734,6 @@ static struct virtqueue *vring_create_virtqueue_packed( vq->vq.callback = callback; vq->vq.vdev = vdev; vq->vq.name = name; - vq->vq.num_free = num; vq->vq.index = index; vq->we_own_ring = true; vq->notify = notify; @@ -1716,22 +1743,10 @@ static struct virtqueue *vring_create_virtqueue_packed( #else vq->broken = false; #endif - vq->last_used_idx = 0 | (1 << VRING_PACKED_EVENT_F_WRAP_CTR); - vq->event_triggered = false; - vq->num_added = 0; vq->packed_ring = true; - vq->use_dma_api = vring_use_dma_api(vdev); -#ifdef DEBUG - vq->in_use = false; - vq->last_add_time_valid = false; -#endif vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !context; - vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); - - if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM)) - vq->weak_barriers = false; vq->packed.ring_dma_addr = ring_dma_addr; vq->packed.driver_event_dma_addr = driver_event_dma_addr; @@ -1759,8 +1774,7 @@ static struct virtqueue *vring_create_virtqueue_packed( memset(vq->packed.desc_state, 0, num * sizeof(struct vring_desc_state_packed)); - /* Put everything in free lists. */ - vq->free_head = 0; + virtqueue_init(vq, num); vq->packed.desc_extra = vring_alloc_desc_extra(num); if (!vq->packed.desc_extra) @@ -2205,7 +2219,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, vq->vq.callback = callback; vq->vq.vdev = vdev; vq->vq.name = name; - vq->vq.num_free = vring.num; vq->vq.index = index; vq->we_own_ring = false; vq->notify = notify; @@ -2215,21 +2228,9 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, #else vq->broken = false; #endif - vq->last_used_idx = 0; - vq->event_triggered = false; - vq->num_added = 0; - vq->use_dma_api = vring_use_dma_api(vdev); -#ifdef DEBUG - vq->in_use = false; - vq->last_add_time_valid = false; -#endif vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !context; - vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); - - if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM)) - vq->weak_barriers = false; vq->split.queue_dma_addr = 0; vq->split.queue_size_in_bytes = 0; @@ -2255,11 +2256,11 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, if (!vq->split.desc_extra) goto err_extra; - /* Put everything in free lists. */ - vq->free_head = 0; memset(vq->split.desc_state, 0, vring.num * sizeof(struct vring_desc_state_split)); + virtqueue_init(vq, vq->split.vring.num); + spin_lock(&vdev->vqs_list_lock); list_add_tail(&vq->vq.list, &vdev->vqs); spin_unlock(&vdev->vqs_list_lock);