linux-kernel - [PATCH 1/2] vfio: add edid api for display (vgpu) devices.

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Message-Id: <20180913054745.6353-2-kraxel@redhat.com>
Date:   Thu, 13 Sep 2018 07:47:44 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Kirti Wankhede <kwankhede@...dia.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     kvm@...r.kernel.org, Gerd Hoffmann <kraxel@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/2] vfio: add edid api for display (vgpu) devices.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 include/uapi/linux/vfio.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 1aa7b82e81..38b591e909 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -200,8 +200,11 @@ struct vfio_device_info {
 #define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2)	/* vfio-platform device */
 #define VFIO_DEVICE_FLAGS_AMBA  (1 << 3)	/* vfio-amba device */
 #define VFIO_DEVICE_FLAGS_CCW	(1 << 4)	/* vfio-ccw device */
+#define VFIO_DEVICE_FLAGS_EDID	(1 << 5)	/* Device supports edid */
 	__u32	num_regions;	/* Max region index + 1 */
 	__u32	num_irqs;	/* Max IRQ index + 1 */
+	__u32   edid_max_x;     /* Max display width (zero == no limit) */
+	__u32   edid_max_y;     /* Max display height (zero == no limit) */
 };
 #define VFIO_DEVICE_GET_INFO		_IO(VFIO_TYPE, VFIO_BASE + 7)
 
@@ -602,6 +605,41 @@ struct vfio_device_ioeventfd {
 
 #define VFIO_DEVICE_IOEVENTFD		_IO(VFIO_TYPE, VFIO_BASE + 16)
 
+/**
+ * VFIO_DEVICE_SET_GFX_EDID - _IOW(VFIO_TYPE, VFIO_BASE + 17,
+ *                                 struct vfio_device_set_gfx_edid)
+ *
+ * Set display link state and edid blob (for UP state).
+ *
+ * For the edid blob spec look here:
+ * https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
+ *
+ * The guest should be notified about edid changes, for example by
+ * setting the link status to down temporarely (emulate monitor
+ * hotplug).
+ *
+ * @link_state:
+ * VFIO_DEVICE_GFX_LINK_STATE_UP: Monitor is turned on.
+ * VFIO_DEVICE_GFX_LINK_STATE_DOWN: Monitor is turned off.
+ *
+ * @edid_size: Size of the edid data blob.
+ * @edid_blob: The actual edid data.
+ *
+ * Returns 0 on success, error code (such as -EINVAL) on failure.
+ */
+struct vfio_device_set_gfx_edid {
+	__u32 argsz;
+	__u32 flags;
+	/* in */
+	__u32 link_state;
+#define VFIO_DEVICE_GFX_LINK_STATE_UP    1
+#define VFIO_DEVICE_GFX_LINK_STATE_DOWN  2
+	__u32 edid_size;
+	__u8  edid_blob[512];
+};
+
+#define VFIO_DEVICE_SET_GFX_EDID _IO(VFIO_TYPE, VFIO_BASE + 17)
+
 /* -------- API for Type1 VFIO IOMMU -------- */
 
 /**
-- 
2.9.3