linux-kernel - [PATCH 1/2] vfio: ABI for setting mdev display flip eventfd

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Date:   Mon, 27 May 2019 16:43:11 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Tina Zhang <tina.zhang@...el.com>,
        intel-gvt-dev@...ts.freedesktop.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kraxel@...hat.com,
        zhenyuw@...ux.intel.com, alex.williamson@...hat.com,
        hang.yuan@...el.com, zhiyuan.lv@...el.com
Subject: [PATCH 1/2] vfio: ABI for setting mdev display flip eventfd

Add VFIO_DEVICE_SET_GFX_FLIP_EVENTFD ioctl command to set eventfd
based signaling mechanism to deliver vGPU framebuffer page flip
event to userspace.

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 include/uapi/linux/vfio.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 02bb7ad6e986..27300597717f 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -696,6 +696,18 @@ struct vfio_device_ioeventfd {
 
 #define VFIO_DEVICE_IOEVENTFD		_IO(VFIO_TYPE, VFIO_BASE + 16)
 
+/**
+ * VFIO_DEVICE_SET_GFX_FLIP_EVENTFD - _IOW(VFIO_TYPE, VFIO_BASE + 17, __s32)
+ *
+ * Set eventfd based signaling mechanism to deliver vGPU framebuffer page
+ * flip event to userspace. A value of -1 is used to stop the page flip
+ * delivering.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+
+#define VFIO_DEVICE_SET_GFX_FLIP_EVENTFD _IO(VFIO_TYPE, VFIO_BASE + 17)
+
 /* -------- API for Type1 VFIO IOMMU -------- */
 
 /**
-- 
2.17.1