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Date: Mon, 16 Nov 2020 12:14:31 +0800
From: Jason Wang <jasowang@...hat.com>
To: Stefano Garzarella <sgarzare@...hat.com>,
virtualization@...ts.linux-foundation.org
Cc: Stefan Hajnoczi <stefanha@...hat.com>,
Laurent Vivier <lvivier@...hat.com>,
linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Max Gurtovoy <mgurtovoy@...dia.com>
Subject: Re: [PATCH RFC 06/12] vdpa_sim: add struct vdpasim_device to store
device properties
On 2020/11/13 下午9:47, Stefano Garzarella wrote:
> Move device properties used during the entire life cycle in a new
> structure to simplify the copy of these fields during the vdpasim
> initialization.
>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
It would be better to do it before patch 2.
> ---
> drivers/vdpa/vdpa_sim/vdpa_sim.h | 17 ++++++++------
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 33 ++++++++++++++--------------
> drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 8 +++++--
> drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 9 +++++---
> 4 files changed, 38 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> index 6a1267c40d5e..76e642042eb0 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> @@ -40,12 +40,17 @@ struct vdpasim_virtqueue {
> irqreturn_t (*cb)(void *data);
> };
>
> +struct vdpasim_device {
> + u64 supported_features;
> + u32 id;
> + int nvqs;
> +};
> +
> struct vdpasim_init_attr {
> - u32 device_id;
> - u64 features;
> + struct vdpasim_device device;
> + int batch_mapping;
> +
> work_func_t work_fn;
> - int batch_mapping;
> - int nvqs;
> };
>
> /* State of each vdpasim device */
> @@ -53,18 +58,16 @@ struct vdpasim {
> struct vdpa_device vdpa;
> struct vdpasim_virtqueue *vqs;
> struct work_struct work;
> + struct vdpasim_device device;
> /* spinlock to synchronize virtqueue state */
> spinlock_t lock;
> /* virtio config according to device type */
> void *config;
> struct vhost_iotlb *iommu;
> void *buffer;
> - u32 device_id;
> u32 status;
> u32 generation;
> u64 features;
> - u64 supported_features;
> - int nvqs;
> /* spinlock to synchronize iommu table */
> spinlock_t iommu_lock;
> };
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 9c9717441bbe..d053bd14b3f8 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -28,7 +28,7 @@ static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
> {
> struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
>
> - vringh_init_iotlb(&vq->vring, vdpasim->supported_features,
> + vringh_init_iotlb(&vq->vring, vdpasim->device.supported_features,
> VDPASIM_QUEUE_MAX, false,
> (struct vring_desc *)(uintptr_t)vq->desc_addr,
> (struct vring_avail *)
> @@ -46,7 +46,7 @@ static void vdpasim_vq_reset(struct vdpasim *vdpasim,
> vq->device_addr = 0;
> vq->cb = NULL;
> vq->private = NULL;
> - vringh_init_iotlb(&vq->vring, vdpasim->supported_features,
> + vringh_init_iotlb(&vq->vring, vdpasim->device.supported_features,
> VDPASIM_QUEUE_MAX, false, NULL, NULL, NULL);
> }
>
> @@ -54,7 +54,7 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
> {
> int i;
>
> - for (i = 0; i < vdpasim->nvqs; i++)
> + for (i = 0; i < vdpasim->device.nvqs; i++)
> vdpasim_vq_reset(vdpasim, &vdpasim->vqs[i]);
>
> spin_lock(&vdpasim->iommu_lock);
> @@ -189,7 +189,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_init_attr *attr)
> struct device *dev;
> int i, size, ret = -ENOMEM;
>
> - device_id = attr->device_id;
> + device_id = attr->device.id;
> /* Currently, we only accept the network and block devices. */
> if (device_id != VIRTIO_ID_NET && device_id != VIRTIO_ID_BLOCK)
> return ERR_PTR(-EOPNOTSUPP);
> @@ -200,10 +200,12 @@ struct vdpasim *vdpasim_create(struct vdpasim_init_attr *attr)
> ops = &vdpasim_config_ops;
>
> vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
> - attr->nvqs);
> + attr->device.nvqs);
> if (!vdpasim)
> goto err_alloc;
>
> + vdpasim->device = attr->device;
> +
> if (device_id == VIRTIO_ID_NET)
> size = sizeof(struct virtio_net_config);
> else
> @@ -212,14 +214,11 @@ struct vdpasim *vdpasim_create(struct vdpasim_init_attr *attr)
> if (!vdpasim->config)
> goto err_iommu;
>
> - vdpasim->vqs = kcalloc(attr->nvqs, sizeof(struct vdpasim_virtqueue),
> - GFP_KERNEL);
> + vdpasim->vqs = kcalloc(vdpasim->device.nvqs,
> + sizeof(struct vdpasim_virtqueue), GFP_KERNEL);
> if (!vdpasim->vqs)
> goto err_iommu;
>
> - vdpasim->device_id = device_id;
> - vdpasim->supported_features = attr->features;
> - vdpasim->nvqs = attr->nvqs;
> INIT_WORK(&vdpasim->work, attr->work_fn);
> spin_lock_init(&vdpasim->lock);
> spin_lock_init(&vdpasim->iommu_lock);
> @@ -238,7 +237,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_init_attr *attr)
> if (!vdpasim->buffer)
> goto err_iommu;
>
> - for (i = 0; i < vdpasim->nvqs; i++)
> + for (i = 0; i < vdpasim->device.nvqs; i++)
> vringh_set_iotlb(&vdpasim->vqs[i].vring, vdpasim->iommu);
>
> vdpasim->vdpa.dma_dev = dev;
> @@ -347,7 +346,7 @@ static u64 vdpasim_get_features(struct vdpa_device *vdpa)
> {
> struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
>
> - return vdpasim->supported_features;
> + return vdpasim->device.supported_features;
> }
>
> static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
> @@ -358,14 +357,14 @@ static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
> if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
> return -EINVAL;
>
> - vdpasim->features = features & vdpasim->supported_features;
> + vdpasim->features = features & vdpasim->device.supported_features;
>
> /* We generally only know whether guest is using the legacy interface
> * here, so generally that's the earliest we can set config fields.
> * Note: We actually require VIRTIO_F_ACCESS_PLATFORM above which
> * implies VIRTIO_F_VERSION_1, but let's not try to be clever here.
> */
> - if (vdpasim->device_id == VIRTIO_ID_NET) {
> + if (vdpasim->device.id == VIRTIO_ID_NET) {
> struct virtio_net_config *config =
> (struct virtio_net_config *)vdpasim->config;
>
> @@ -391,7 +390,7 @@ static u32 vdpasim_get_device_id(struct vdpa_device *vdpa)
> {
> struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
>
> - return vdpasim->device_id;
> + return vdpasim->device.id;
> }
>
> static u32 vdpasim_get_vendor_id(struct vdpa_device *vdpa)
> @@ -427,10 +426,10 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
> {
> struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
>
> - if (vdpasim->device_id == VIRTIO_ID_BLOCK &&
> + if (vdpasim->device.id == VIRTIO_ID_BLOCK &&
> (offset + len < sizeof(struct virtio_blk_config)))
> memcpy(buf, vdpasim->config + offset, len);
> - else if (vdpasim->device_id == VIRTIO_ID_NET &&
> + else if (vdpasim->device.id == VIRTIO_ID_NET &&
> (offset + len < sizeof(struct virtio_net_config)))
> memcpy(buf, vdpasim->config + offset, len);
> }
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> index 386dbb2f7138..363273d72e26 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> @@ -78,9 +78,13 @@ static int __init vdpasim_blk_init(void)
> struct virtio_blk_config *config;
> int ret;
>
> - attr.device_id = VIRTIO_ID_BLOCK;
> - attr.features = VDPASIM_FEATURES | VDPASIM_BLK_FEATURES;
> + attr.device.id = VIRTIO_ID_BLOCK;
> + attr.device.supported_features = VDPASIM_FEATURES |
> + VDPASIM_BLK_FEATURES;
> + attr.device.nvqs = VDPASIM_BLK_VQ_NUM;
> +
> attr.work_fn = vdpasim_blk_work;
> +
> vdpasim_blk_dev = vdpasim_create(&attr);
> if (IS_ERR(vdpasim_blk_dev)) {
> ret = PTR_ERR(vdpasim_blk_dev);
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> index e1e57c52b108..88c9569f6bd3 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> @@ -105,11 +105,14 @@ static int __init vdpasim_net_init(void)
> struct virtio_net_config *config;
> int ret;
>
> - attr.device_id = VIRTIO_ID_NET;
> - attr.features = VDPASIM_FEATURES | VDPASIM_NET_FEATURES;
> - attr.nvqs = VDPASIM_NET_VQ_NUM;
> + attr.device.id = VIRTIO_ID_NET;
> + attr.device.supported_features = VDPASIM_FEATURES |
> + VDPASIM_NET_FEATURES;
> + attr.device.nvqs = VDPASIM_NET_VQ_NUM;
> +
> attr.work_fn = vdpasim_net_work;
> attr.batch_mapping = batch_mapping;
> +
Unnecessary changes.
Thanks
> vdpasim_net_dev = vdpasim_create(&attr);
> if (IS_ERR(vdpasim_net_dev)) {
> ret = PTR_ERR(vdpasim_net_dev);
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