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

Gerd Hoffmann
2018-09-13T05:47:44Z

Signed-off-by: Gerd Hoffmann <kraxel@redhat.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