Messages in this thread | | | From | Eli Cohen <> | Subject | RE: [PATCH v4 1/4] vdpa: Add stop operation | Date | Wed, 1 Jun 2022 05:35:02 +0000 |
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> From: Eugenio Pérez <eperezma@redhat.com> > Sent: Thursday, May 26, 2022 3:44 PM > To: Michael S. Tsirkin <mst@redhat.com>; kvm@vger.kernel.org; virtualization@lists.linux-foundation.org; linux-kernel@vger.kernel.org; > Jason Wang <jasowang@redhat.com>; netdev@vger.kernel.org > Cc: martinh@xilinx.com; Stefano Garzarella <sgarzare@redhat.com>; martinpo@xilinx.com; lvivier@redhat.com; pabloc@xilinx.com; > Parav Pandit <parav@nvidia.com>; Eli Cohen <elic@nvidia.com>; Dan Carpenter <dan.carpenter@oracle.com>; Xie Yongji > <xieyongji@bytedance.com>; Christophe JAILLET <christophe.jaillet@wanadoo.fr>; Zhang Min <zhang.min9@zte.com.cn>; Wu Zongyong > <wuzongyong@linux.alibaba.com>; lulu@redhat.com; Zhu Lingshan <lingshan.zhu@intel.com>; Piotr.Uminski@intel.com; Si-Wei Liu <si- > wei.liu@oracle.com>; ecree.xilinx@gmail.com; gautam.dawar@amd.com; habetsm.xilinx@gmail.com; tanuj.kamde@amd.com; > hanand@xilinx.com; dinang@xilinx.com; Longpeng <longpeng2@huawei.com> > Subject: [PATCH v4 1/4] vdpa: Add stop operation > > This operation is optional: It it's not implemented, backend feature bit > will not be exposed. > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com> > --- > include/linux/vdpa.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h > index 15af802d41c4..ddfebc4e1e01 100644 > --- a/include/linux/vdpa.h > +++ b/include/linux/vdpa.h > @@ -215,6 +215,11 @@ struct vdpa_map_file { > * @reset: Reset device > * @vdev: vdpa device > * Returns integer: success (0) or error (< 0) > + * @stop: Stop or resume the device (optional, but it must > + * be implemented if require device stop) > + * @vdev: vdpa device > + * @stop: stop (true), not stop (false) > + * Returns integer: success (0) or error (< 0)
I assume after successful "stop" the device is guaranteed to stop processing descriptors and after resume it may process descriptors? If that is so, I think it should be clear in the change log.
> * @get_config_size: Get the size of the configuration space includes > * fields that are conditional on feature bits. > * @vdev: vdpa device > @@ -316,6 +321,7 @@ struct vdpa_config_ops { > u8 (*get_status)(struct vdpa_device *vdev); > void (*set_status)(struct vdpa_device *vdev, u8 status); > int (*reset)(struct vdpa_device *vdev); > + int (*stop)(struct vdpa_device *vdev, bool stop); > size_t (*get_config_size)(struct vdpa_device *vdev); > void (*get_config)(struct vdpa_device *vdev, unsigned int offset, > void *buf, unsigned int len); > -- > 2.31.1
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