Commit 3cdf7525 authored by Gerd Hoffmann's avatar Gerd Hoffmann Committed by Alex Williamson
Browse files

vfio: add edid api for display (vgpu) devices. 



This allows to set EDID monitor information for the vgpu display, for a
more flexible display configuration, using a special vfio region.  Check
the comment describing struct vfio_region_gfx_edid for more details.

Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent cf3f98c7

include/uapi/linux/vfio.h

+50 −0
Original line number Diff line number Diff line
@@ -301,6 +301,56 @@ struct vfio_region_info_cap_type { 
#define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG	(2)

#define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG	(3)



#define VFIO_REGION_TYPE_GFX                    (1)

#define VFIO_REGION_SUBTYPE_GFX_EDID            (1)



/**

 * struct vfio_region_gfx_edid - EDID region layout.

 *

 * Set display link state and EDID blob.

 *

 * The EDID blob has monitor information such as brand, name, serial

 * number, physical size, supported video modes and more.

 *

 * This special region allows userspace (typically qemu) set a virtual

 * EDID for the virtual monitor, which allows a flexible display

 * configuration.

 *

 * For the edid blob spec look here:

 *    https://en.wikipedia.org/wiki/Extended_Display_Identification_Data

 *

 * On linux systems you can find the EDID blob in sysfs:

 *    /sys/class/drm/${card}/${connector}/edid

 *

 * You can use the edid-decode ulility (comes with xorg-x11-utils) to

 * decode the EDID blob.

 *

 * @edid_offset: location of the edid blob, relative to the

 *               start of the region (readonly).

 * @edid_max_size: max size of the edid blob (readonly).

 * @edid_size: actual edid size (read/write).

 * @link_state: display link state (read/write).

 * VFIO_DEVICE_GFX_LINK_STATE_UP: Monitor is turned on.

 * VFIO_DEVICE_GFX_LINK_STATE_DOWN: Monitor is turned off.

 * @max_xres: max display width (0 == no limitation, readonly).

 * @max_yres: max display height (0 == no limitation, readonly).

 *

 * EDID update protocol:

 *   (1) set link-state to down.

 *   (2) update edid blob and size.

 *   (3) set link-state to up.

 */

struct vfio_region_gfx_edid {

	__u32 edid_offset;

	__u32 edid_max_size;

	__u32 edid_size;

	__u32 max_xres;

	__u32 max_yres;

	__u32 link_state;

#define VFIO_DEVICE_GFX_LINK_STATE_UP    1

#define VFIO_DEVICE_GFX_LINK_STATE_DOWN  2

};



/*

 * The MSIX mappable capability informs that MSIX data of a BAR can be mmapped

 * which allows direct access to non-MSIX registers which happened to be within