[PATCH RFC 06/12] vdpa_sim: add struct vdpasim_device to store device properties

Stefano Garzarella
2020-11-13T13:48:15Z

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@redhat.com>
---
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;
+
vdpasim_net_dev = vdpasim_create(&attr);
if (IS_ERR(vdpasim_net_dev)) {
ret = PTR_ERR(vdpasim_net_dev);
--
2.26.2