| Message ID | 20220310072051.2175-2-longpeng2@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vdpa: add two ioctl commands to support generic vDPA | expand |
在 2022/3/10 下午3:20, Longpeng(Mike) 写道: > From: Longpeng <longpeng2@huawei.com> > > - GET_CONFIG_SIZE: return the size of the virtio config space. > > The size contains the fields which are conditional on feature > bits. > > Signed-off-by: Longpeng <longpeng2@huawei.com> Acked-by: Jason Wang <jasowang@redhat.com> > --- > drivers/vhost/vdpa.c | 17 +++++++++++++++++ > include/linux/vdpa.h | 3 ++- > include/uapi/linux/vhost.h | 4 ++++ > 3 files changed, 23 insertions(+), 1 deletion(-) > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c > index ec5249e..605c7ae 100644 > --- a/drivers/vhost/vdpa.c > +++ b/drivers/vhost/vdpa.c > @@ -355,6 +355,20 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp) > return 0; > } > > +static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp) > +{ > + struct vdpa_device *vdpa = v->vdpa; > + const struct vdpa_config_ops *ops = vdpa->config; > + u32 size; > + > + size = ops->get_config_size(vdpa); > + > + if (copy_to_user(argp, &size, sizeof(size))) > + return -EFAULT; > + > + return 0; > +} > + > static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, > void __user *argp) > { > @@ -492,6 +506,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, > case VHOST_VDPA_GET_IOVA_RANGE: > r = vhost_vdpa_get_iova_range(v, argp); > break; > + case VHOST_VDPA_GET_CONFIG_SIZE: > + r = vhost_vdpa_get_config_size(v, argp); > + break; > default: > r = vhost_dev_ioctl(&v->vdev, cmd, argp); > if (r == -ENOIOCTLCMD) > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h > index 721089b..a526919 100644 > --- a/include/linux/vdpa.h > +++ b/include/linux/vdpa.h > @@ -207,7 +207,8 @@ struct vdpa_map_file { > * @reset: Reset device > * @vdev: vdpa device > * Returns integer: success (0) or error (< 0) > - * @get_config_size: Get the size of the configuration space > + * @get_config_size: Get the size of the configuration space includes > + * fields that are conditional on feature bits. > * @vdev: vdpa device > * Returns size_t: configuration size > * @get_config: Read from device specific configuration space > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index c998860..bc74e95 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -150,4 +150,8 @@ > /* Get the valid iova range */ > #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ > struct vhost_vdpa_iova_range) > + > +/* Get the config size */ > +#define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32) > + > #endif
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index ec5249e..605c7ae 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -355,6 +355,20 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp) return 0; } +static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u32 size; + + size = ops->get_config_size(vdpa); + + if (copy_to_user(argp, &size, sizeof(size))) + return -EFAULT; + + return 0; +} + static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, void __user *argp) { @@ -492,6 +506,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, case VHOST_VDPA_GET_IOVA_RANGE: r = vhost_vdpa_get_iova_range(v, argp); break; + case VHOST_VDPA_GET_CONFIG_SIZE: + r = vhost_vdpa_get_config_size(v, argp); + break; default: r = vhost_dev_ioctl(&v->vdev, cmd, argp); if (r == -ENOIOCTLCMD) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 721089b..a526919 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -207,7 +207,8 @@ struct vdpa_map_file { * @reset: Reset device * @vdev: vdpa device * Returns integer: success (0) or error (< 0) - * @get_config_size: Get the size of the configuration space + * @get_config_size: Get the size of the configuration space includes + * fields that are conditional on feature bits. * @vdev: vdpa device * Returns size_t: configuration size * @get_config: Read from device specific configuration space diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index c998860..bc74e95 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -150,4 +150,8 @@ /* Get the valid iova range */ #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ struct vhost_vdpa_iova_range) + +/* Get the config size */ +#define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32) + #endif