linux-kernel - [PATCH v4 1/4] vdpa: Add stop operation

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Message-Id: <20220526124338.36247-2-eperezma@redhat.com>
Date:   Thu, 26 May 2022 14:43:35 +0200
From:   Eugenio Pérez <eperezma@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        netdev@...r.kernel.org
Cc:     martinh@...inx.com, Stefano Garzarella <sgarzare@...hat.com>,
        martinpo@...inx.com, lvivier@...hat.com, pabloc@...inx.com,
        Parav Pandit <parav@...dia.com>, Eli Cohen <elic@...dia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zhang Min <zhang.min9@....com.cn>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>, lulu@...hat.com,
        Zhu Lingshan <lingshan.zhu@...el.com>, Piotr.Uminski@...el.com,
        Si-Wei Liu <si-wei.liu@...cle.com>, ecree.xilinx@...il.com,
        gautam.dawar@....com, habetsm.xilinx@...il.com,
        tanuj.kamde@....com, hanand@...inx.com, dinang@...inx.com,
        Longpeng <longpeng2@...wei.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@...hat.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)
  * @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