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Date: Mon, 16 Nov 2020 11:30:18 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: virtualization@...ts.linux-foundation.org,
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 Mon, Nov 16, 2020 at 12:14:31PM +0800, Jason Wang wrote:
>
>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.
>
Okay, I'll move this patch.
>
>>---
>> 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.
I'll remove these new lines.
Thanks,
Stefano
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