From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out30-44.freemail.mail.aliyun.com ([115.124.30.44]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nbwaT-003dkp-Ro for linux-um@lists.infradead.org; Wed, 06 Apr 2022 03:44:07 +0000 From: Xuan Zhuo Subject: [PATCH v9 06/32] virtio_ring: split: extract the logic of alloc queue Date: Wed, 6 Apr 2022 11:43:20 +0800 Message-Id: <20220406034346.74409-7-xuanzhuo@linux.alibaba.com> In-Reply-To: <20220406034346.74409-1-xuanzhuo@linux.alibaba.com> References: <20220406034346.74409-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: virtualization@lists.linux-foundation.org Cc: Jeff Dike , Richard Weinberger , Anton Ivanov , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Hans de Goede , Mark Gross , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Alexander Gordeev , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Johannes Berg , 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 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 | 53 ++++++++++++++++++++++++------------ 1 file changed, 36 insertions(+), 17 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 33fddfb907a6..72d5ae063fa0 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -915,23 +915,15 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq) return NULL; } -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 void *vring_alloc_queue_split(struct virtio_device *vdev, + dma_addr_t *dma_addr, + u32 *n, + unsigned int vring_align, + bool weak_barriers, + bool may_reduce_num) { - struct virtqueue *vq; void *queue = NULL; - dma_addr_t dma_addr; - size_t queue_size_in_bytes; - struct vring vring; + u32 num = *n; /* We assume num is a power of 2. */ if (num & (num - 1)) { @@ -942,7 +934,7 @@ static struct virtqueue *vring_create_virtqueue_split( /* TODO: allocate each queue chunk individually */ for (; num && vring_size(num, vring_align) > PAGE_SIZE; num /= 2) { queue = vring_alloc_queue(vdev, vring_size(num, vring_align), - &dma_addr, + dma_addr, GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO); if (queue) break; @@ -956,11 +948,38 @@ static struct virtqueue *vring_create_virtqueue_split( if (!queue) { /* Try to get a single page. You are my only hope! */ queue = vring_alloc_queue(vdev, vring_size(num, vring_align), - &dma_addr, GFP_KERNEL|__GFP_ZERO); + dma_addr, GFP_KERNEL|__GFP_ZERO); } if (!queue) return NULL; + *n = num; + return queue; +} + +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) +{ + size_t queue_size_in_bytes; + struct virtqueue *vq; + dma_addr_t dma_addr; + struct vring vring; + void *queue; + + queue = vring_alloc_queue_split(vdev, &dma_addr, &num, vring_align, + weak_barriers, may_reduce_num); + if (!queue) + return NULL; + queue_size_in_bytes = vring_size(num, vring_align); vring_init(&vring, num, queue, vring_align); -- 2.31.0 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um