linux-kernel - [PATCH v4 2/5] vduse: Add new ioctl VDUSE_DEV_GET

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Date: Wed,  7 Feb 2024 13:43:29 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	jasowang@...hat.com,
	mst@...hat.com,
	xieyongji@...edance.com,
	linux-kernel@...r.kernel.org,
	maxime.coquelin@...hat.com
Subject: [PATCH v4 2/5] vduse: Add new ioctl VDUSE_DEV_GET_STATUS

The ioctl VDUSE_DEV_GET_STATUS is used by the Userspace App
to get the device status

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 7 +++++++
 include/uapi/linux/vduse.h         | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index ab246da27616..ef3c9681941e 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1389,6 +1389,13 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
 		ret = 0;
 		break;
 	}
+
+	case VDUSE_DEV_GET_STATUS:
+		/*
+		 * Returns the status read from device
+		 */
+		ret = put_user(dev->status, (u8 __user *)argp);
+		break;
 	default:
 		ret = -ENOIOCTLCMD;
 		break;
diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h
index 125d7529d91b..f501173a9d69 100644
--- a/include/uapi/linux/vduse.h
+++ b/include/uapi/linux/vduse.h
@@ -353,4 +353,6 @@ struct vduse_dev_response {
 /* get device configuration space */
 #define VDUSE_DEV_GET_CONFIG _IOR(VDUSE_BASE, 0x1b, struct vduse_config_data)
 
+#define VDUSE_DEV_GET_STATUS _IOR(VDUSE_BASE, 0x1c, __u8)
+
 #endif /* _UAPI_VDUSE_H_ */
-- 
2.43.0