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Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org Subject: [PATCH vhost v4 08/10] virtio_ring: export premapped to driver by struct virtqueue Date: Tue, 12 Mar 2024 11:35:55 +0800 Message-Id: <20240312033557.6351-9-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240312033557.6351-1-xuanzhuo@linux.alibaba.com> References: <20240312033557.6351-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 89bc1d4948eb Export the premapped to drivers, then drivers can check the vq premapped mode after the find_vqs(). Because the find_vqs() just try to enable the vq premapped mode, the driver must check that after find_vqs(). Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 13 +++++-------- include/linux/virtio.h | 1 + 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 538940ede46a..34f4b2c0c31e 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -191,9 +191,6 @@ struct vring_virtqueue { /* Host publishes avail event idx */ bool event; - /* Do DMA mapping by driver */ - bool premapped; - /* Head of free buffer list. */ unsigned int free_head; /* Number we've added since last sync. */ @@ -311,7 +308,7 @@ static bool vring_use_dma_api(const struct virtio_device *vdev) static bool vring_need_unmap_buffer(const struct vring_virtqueue *vring) { - return vring->use_dma_api && !vring->premapped; + return vring->use_dma_api && !vring->vq.premapped; } size_t virtio_max_dma_size(const struct virtio_device *vdev) @@ -383,7 +380,7 @@ static struct device *vring_dma_dev(const struct vring_virtqueue *vq) static int vring_map_one_sg(const struct vring_virtqueue *vq, struct scatterlist *sg, enum dma_data_direction direction, dma_addr_t *addr) { - if (vq->premapped) { + if (vq->vq.premapped) { *addr = sg_dma_address(sg); return 0; } @@ -2157,7 +2154,7 @@ static struct virtqueue *vring_create_virtqueue_packed(struct virtio_device *vde vq->packed_ring = true; vq->dma_dev = dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); + vq->vq.premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !cfg_vq_get(cfg, ctx); @@ -2705,7 +2702,7 @@ static struct virtqueue *__vring_new_virtqueue(struct virtio_device *vdev, #endif vq->dma_dev = tp_cfg->dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); + vq->vq.premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !cfg_vq_get(cfg, ctx); @@ -2841,7 +2838,7 @@ int virtqueue_set_dma_premapped(struct virtqueue *_vq) return -EINVAL; } - vq->premapped = true; + vq->vq.premapped = true; if (vq->packed_ring) { kfree(vq->packed.desc_dma); diff --git a/include/linux/virtio.h b/include/linux/virtio.h index b0201747a263..407277d5a16b 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -36,6 +36,7 @@ struct virtqueue { unsigned int num_free; unsigned int num_max; bool reset; + bool premapped; void *priv; };