linux-kernel - [PATCH v7 4/6] vfio: Define vfio based vgpu's dma-buf operations

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Date:   Wed,  7 Jun 2017 15:44:36 +0800
From:   Xiaoguang Chen <xiaoguang.chen@...el.com>
To:     alex.williamson@...hat.com, kraxel@...hat.com,
        chris@...is-wilson.co.uk, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, zhenyuw@...ux.intel.com,
        zhiyuan.lv@...el.com, intel-gvt-dev@...ts.freedesktop.org,
        zhi.a.wang@...el.com, kevin.tian@...el.com
Cc:     Xiaoguang Chen <xiaoguang.chen@...el.com>
Subject: [PATCH v7 4/6] vfio: Define vfio based vgpu's dma-buf operations

Here we defined a new ioctl to create a fd for a vfio device based on
the input type. Now only one type is supported that is a dma-buf
management fd.
Two ioctls are defined for the dma-buf management fd: query the vfio
vgpu's plane information and create a dma-buf for a plane.

Signed-off-by: Xiaoguang Chen <xiaoguang.chen@...el.com>
---
 include/uapi/linux/vfio.h | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index ae46105..24427b7 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -502,6 +502,64 @@ struct vfio_pci_hot_reset {
 
 #define VFIO_DEVICE_PCI_HOT_RESET	_IO(VFIO_TYPE, VFIO_BASE + 13)
 
+/**
+ * VFIO_DEVICE_GET_FD - _IO(VFIO_TYPE, VFIO_BASE + 14, __u32)
+ *
+ * Create a fd for a vfio device based on the input type
+ * Vendor driver should handle this ioctl to create a fd and manage the
+ * life cycle of this fd.
+ *
+ * Return: a fd if vendor support that type, -errno if not supported
+ */
+
+#define VFIO_DEVICE_GET_FD	_IO(VFIO_TYPE, VFIO_BASE + 14)
+
+struct vfio_vgpu_plane_info {
+	__u64 start;
+	__u64 drm_format_mod;
+	__u32 drm_format;
+	__u32 width;
+	__u32 height;
+	__u32 stride;
+	__u32 size;
+	__u32 x_pos;
+	__u32 y_pos;
+	__u32 padding;
+};
+
+#define VFIO_DEVICE_DMABUF_MGR_FD	0 /* Supported fd types */
+
+/*
+ * VFIO_DEVICE_QUERY_PLANE - _IO(VFIO_TYPE, VFIO_BASE + 15,
+ *						struct vfio_vgpu_query_plane)
+ * Query plane information
+ */
+struct vfio_vgpu_query_plane {
+	__u32 argsz;
+	__u32 flags;
+	struct vfio_vgpu_plane_info plane_info;
+	__u32 plane_id;
+	__u32 padding;
+};
+
+#define VFIO_DEVICE_QUERY_PLANE _IO(VFIO_TYPE, VFIO_BASE + 15)
+
+/*
+ * VFIO_DEVICE_CREATE_DMABUF - _IO(VFIO, VFIO_BASE + 16,
+ *						struct vfio_vgpu_create_dmabuf)
+ *
+ * Create a dma-buf for a plane
+ */
+struct vfio_vgpu_create_dmabuf {
+	__u32 argsz;
+	__u32 flags;
+	struct vfio_vgpu_plane_info plane_info;
+	__s32 fd;
+	__u32 plane_id;
+};
+
+#define VFIO_DEVICE_CREATE_DMABUF _IO(VFIO_TYPE, VFIO_BASE + 16)
+
 /* -------- API for Type1 VFIO IOMMU -------- */
 
 /**
-- 
2.7.4