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 /*
  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
  * Copyright (c) 2007 Jakob Bornecrantz <wallbraker@gmail.com>
  * Copyright (c) 2008 Red Hat Inc.
  * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
  * Copyright (c) 2007-2008 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */
 
 #ifndef _DRM_MODE_H
 #define _DRM_MODE_H
 
 #include "drm.h"
 
 #if defined(__cplusplus)
 extern "C" {
 #endif
 
 /**
  * DOC: overview
  *
  * DRM exposes many UAPI and structure definitions to have a consistent
  * and standardized interface with users.
  * Userspace can refer to these structure definitions and UAPI formats
  * to communicate to drivers.
  */
 
 #define DRM_CONNECTOR_NAME_LEN  32
 #define DRM_DISPLAY_MODE_LEN    32
 #define DRM_PROP_NAME_LEN   32
 
 #define DRM_MODE_TYPE_BUILTIN   (1<<0) /* deprecated */
 #define DRM_MODE_TYPE_CLOCK_C   ((1<<1) | DRM_MODE_TYPE_BUILTIN) /* deprecated */
 #define DRM_MODE_TYPE_CRTC_C    ((1<<2) | DRM_MODE_TYPE_BUILTIN) /* deprecated */
 #define DRM_MODE_TYPE_PREFERRED (1<<3)
 #define DRM_MODE_TYPE_DEFAULT   (1<<4) /* deprecated */
 #define DRM_MODE_TYPE_USERDEF   (1<<5)
 #define DRM_MODE_TYPE_DRIVER    (1<<6)
 
 #define DRM_MODE_TYPE_ALL   (DRM_MODE_TYPE_PREFERRED |  \
                  DRM_MODE_TYPE_USERDEF |    \
                  DRM_MODE_TYPE_DRIVER)
 
 /* Video mode flags */
 /* bit compatible with the xrandr RR_ definitions (bits 0-13)
  *
  * ABI warning: Existing userspace really expects
  * the mode flags to match the xrandr definitions. Any
  * changes that don't match the xrandr definitions will
  * likely need a new client cap or some other mechanism
  * to avoid breaking existing userspace. This includes
  * allocating new flags in the previously unused bits!
  */
 #define DRM_MODE_FLAG_PHSYNC            (1<<0)
 #define DRM_MODE_FLAG_NHSYNC            (1<<1)
 #define DRM_MODE_FLAG_PVSYNC            (1<<2)
 #define DRM_MODE_FLAG_NVSYNC            (1<<3)
 #define DRM_MODE_FLAG_INTERLACE         (1<<4)
 #define DRM_MODE_FLAG_DBLSCAN           (1<<5)
 #define DRM_MODE_FLAG_CSYNC         (1<<6)
 #define DRM_MODE_FLAG_PCSYNC            (1<<7)
 #define DRM_MODE_FLAG_NCSYNC            (1<<8)
 #define DRM_MODE_FLAG_HSKEW         (1<<9) /* hskew provided */
 #define DRM_MODE_FLAG_BCAST         (1<<10) /* deprecated */
 #define DRM_MODE_FLAG_PIXMUX            (1<<11) /* deprecated */
 #define DRM_MODE_FLAG_DBLCLK            (1<<12)
 #define DRM_MODE_FLAG_CLKDIV2           (1<<13)
  /*
   * When adding a new stereo mode don't forget to adjust DRM_MODE_FLAGS_3D_MAX
   * (define not exposed to user space).
   */
 #define DRM_MODE_FLAG_3D_MASK           (0x1f<<14)
 #define  DRM_MODE_FLAG_3D_NONE      (0<<14)
 #define  DRM_MODE_FLAG_3D_FRAME_PACKING     (1<<14)
 #define  DRM_MODE_FLAG_3D_FIELD_ALTERNATIVE (2<<14)
 #define  DRM_MODE_FLAG_3D_LINE_ALTERNATIVE  (3<<14)
 #define  DRM_MODE_FLAG_3D_SIDE_BY_SIDE_FULL (4<<14)
 #define  DRM_MODE_FLAG_3D_L_DEPTH       (5<<14)
 #define  DRM_MODE_FLAG_3D_L_DEPTH_GFX_GFX_DEPTH (6<<14)
 #define  DRM_MODE_FLAG_3D_TOP_AND_BOTTOM    (7<<14)
 #define  DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF (8<<14)
 
 /* Picture aspect ratio options */
 #define DRM_MODE_PICTURE_ASPECT_NONE        0
 #define DRM_MODE_PICTURE_ASPECT_4_3     1
 #define DRM_MODE_PICTURE_ASPECT_16_9        2
 #define DRM_MODE_PICTURE_ASPECT_64_27       3
 #define DRM_MODE_PICTURE_ASPECT_256_135     4
 
 /* Content type options */
 #define DRM_MODE_CONTENT_TYPE_NO_DATA       0
 #define DRM_MODE_CONTENT_TYPE_GRAPHICS      1
 #define DRM_MODE_CONTENT_TYPE_PHOTO     2
 #define DRM_MODE_CONTENT_TYPE_CINEMA        3
 #define DRM_MODE_CONTENT_TYPE_GAME      4
 
 /* Aspect ratio flag bitmask (4 bits 22:19) */
 #define DRM_MODE_FLAG_PIC_AR_MASK       (0x0F<<19)
 #define  DRM_MODE_FLAG_PIC_AR_NONE \
             (DRM_MODE_PICTURE_ASPECT_NONE<<19)
 #define  DRM_MODE_FLAG_PIC_AR_4_3 \
             (DRM_MODE_PICTURE_ASPECT_4_3<<19)
 #define  DRM_MODE_FLAG_PIC_AR_16_9 \
             (DRM_MODE_PICTURE_ASPECT_16_9<<19)
 #define  DRM_MODE_FLAG_PIC_AR_64_27 \
             (DRM_MODE_PICTURE_ASPECT_64_27<<19)
 #define  DRM_MODE_FLAG_PIC_AR_256_135 \
             (DRM_MODE_PICTURE_ASPECT_256_135<<19)
 
 #define  DRM_MODE_FLAG_ALL  (DRM_MODE_FLAG_PHSYNC |     \
                  DRM_MODE_FLAG_NHSYNC |     \
                  DRM_MODE_FLAG_PVSYNC |     \
                  DRM_MODE_FLAG_NVSYNC |     \
                  DRM_MODE_FLAG_INTERLACE |  \
                  DRM_MODE_FLAG_DBLSCAN |    \
                  DRM_MODE_FLAG_CSYNC |      \
                  DRM_MODE_FLAG_PCSYNC |     \
                  DRM_MODE_FLAG_NCSYNC |     \
                  DRM_MODE_FLAG_HSKEW |      \
                  DRM_MODE_FLAG_DBLCLK |     \
                  DRM_MODE_FLAG_CLKDIV2 |    \
                  DRM_MODE_FLAG_3D_MASK)
 
 /* DPMS flags */
 /* bit compatible with the xorg definitions. */
 #define DRM_MODE_DPMS_ON    0
 #define DRM_MODE_DPMS_STANDBY   1
 #define DRM_MODE_DPMS_SUSPEND   2
 #define DRM_MODE_DPMS_OFF   3
 
 /* Scaling mode options */
 #define DRM_MODE_SCALE_NONE     0 /* Unmodified timing (display or
                          software can still scale) */
 #define DRM_MODE_SCALE_FULLSCREEN   1 /* Full screen, ignore aspect */
 #define DRM_MODE_SCALE_CENTER       2 /* Centered, no scaling */
 #define DRM_MODE_SCALE_ASPECT       3 /* Full screen, preserve aspect */
 
 /* Dithering mode options */
 #define DRM_MODE_DITHERING_OFF  0
 #define DRM_MODE_DITHERING_ON   1
 #define DRM_MODE_DITHERING_AUTO 2
 
 /* Dirty info options */
 #define DRM_MODE_DIRTY_OFF      0
 #define DRM_MODE_DIRTY_ON       1
 #define DRM_MODE_DIRTY_ANNOTATE 2
 
 /* Link Status options */
 #define DRM_MODE_LINK_STATUS_GOOD   0
 #define DRM_MODE_LINK_STATUS_BAD    1
 
 /*
  * DRM_MODE_ROTATE_<degrees>
  *
  * Signals that a drm plane is been rotated <degrees> degrees in counter
  * clockwise direction.
  *
  * This define is provided as a convenience, looking up the property id
  * using the name->prop id lookup is the preferred method.
  */
 #define DRM_MODE_ROTATE_0       (1<<0)
 #define DRM_MODE_ROTATE_90      (1<<1)
 #define DRM_MODE_ROTATE_180     (1<<2)
 #define DRM_MODE_ROTATE_270     (1<<3)
 
 /*
  * DRM_MODE_ROTATE_MASK
  *
  * Bitmask used to look for drm plane rotations.
  */
 #define DRM_MODE_ROTATE_MASK (\
         DRM_MODE_ROTATE_0  | \
         DRM_MODE_ROTATE_90  | \
         DRM_MODE_ROTATE_180 | \
         DRM_MODE_ROTATE_270)
 
 /*
  * DRM_MODE_REFLECT_<axis>
  *
  * Signals that the contents of a drm plane is reflected along the <axis> axis,
  * in the same way as mirroring.
  * See kerneldoc chapter "Plane Composition Properties" for more details.
  *
  * This define is provided as a convenience, looking up the property id
  * using the name->prop id lookup is the preferred method.
  */
 #define DRM_MODE_REFLECT_X      (1<<4)
 #define DRM_MODE_REFLECT_Y      (1<<5)
 
 /*
  * DRM_MODE_REFLECT_MASK
  *
  * Bitmask used to look for drm plane reflections.
  */
 #define DRM_MODE_REFLECT_MASK (\
         DRM_MODE_REFLECT_X | \
         DRM_MODE_REFLECT_Y)
 
 /* Content Protection Flags */
 #define DRM_MODE_CONTENT_PROTECTION_UNDESIRED   0
 #define DRM_MODE_CONTENT_PROTECTION_DESIRED     1
 #define DRM_MODE_CONTENT_PROTECTION_ENABLED     2
 
 /**
  * struct drm_mode_modeinfo - Display mode information.
  * @clock: pixel clock in kHz
  * @hdisplay: horizontal display size
  * @hsync_start: horizontal sync start
  * @hsync_end: horizontal sync end
  * @htotal: horizontal total size
  * @hskew: horizontal skew
  * @vdisplay: vertical display size
  * @vsync_start: vertical sync start
  * @vsync_end: vertical sync end
  * @vtotal: vertical total size
  * @vscan: vertical scan
  * @vrefresh: approximate vertical refresh rate in Hz
  * @flags: bitmask of misc. flags, see DRM_MODE_FLAG_* defines
  * @type: bitmask of type flags, see DRM_MODE_TYPE_* defines
  * @name: string describing the mode resolution
  *
  * This is the user-space API display mode information structure. For the
  * kernel version see struct drm_display_mode.
  */
 struct drm_mode_modeinfo {
     __u32 clock;
     __u16 hdisplay;
     __u16 hsync_start;
     __u16 hsync_end;
     __u16 htotal;
     __u16 hskew;
     __u16 vdisplay;
     __u16 vsync_start;
     __u16 vsync_end;
     __u16 vtotal;
     __u16 vscan;
 
     __u32 vrefresh;
 
     __u32 flags;
     __u32 type;
     char name[DRM_DISPLAY_MODE_LEN];
 };
 
 struct drm_mode_card_res {
     __u64 fb_id_ptr;
     __u64 crtc_id_ptr;
     __u64 connector_id_ptr;
     __u64 encoder_id_ptr;
     __u32 count_fbs;
     __u32 count_crtcs;
     __u32 count_connectors;
     __u32 count_encoders;
     __u32 min_width;
     __u32 max_width;
     __u32 min_height;
     __u32 max_height;
 };
 
 struct drm_mode_crtc {
     __u64 set_connectors_ptr;
     __u32 count_connectors;
 
     __u32 crtc_id; /**< Id */
     __u32 fb_id; /**< Id of framebuffer */
 
     __u32 x; /**< x Position on the framebuffer */
     __u32 y; /**< y Position on the framebuffer */
 
     __u32 gamma_size;
     __u32 mode_valid;
     struct drm_mode_modeinfo mode;
 };
 
 #define DRM_MODE_PRESENT_TOP_FIELD  (1<<0)
 #define DRM_MODE_PRESENT_BOTTOM_FIELD   (1<<1)
 
 /* Planes blend with or override other bits on the CRTC */
 struct drm_mode_set_plane {
     __u32 plane_id;
     __u32 crtc_id;
     __u32 fb_id; /* fb object contains surface format type */
     __u32 flags; /* see above flags */
 
     /* Signed dest location allows it to be partially off screen */
     __s32 crtc_x;
     __s32 crtc_y;
     __u32 crtc_w;
     __u32 crtc_h;
 
     /* Source values are 16.16 fixed point */
     __u32 src_x;
     __u32 src_y;
     __u32 src_h;
     __u32 src_w;
 };
 
 /**
  * struct drm_mode_get_plane - Get plane metadata.
  *
  * Userspace can perform a GETPLANE ioctl to retrieve information about a
  * plane.
  *
  * To retrieve the number of formats supported, set @count_format_types to zero
  * and call the ioctl. @count_format_types will be updated with the value.
  *
  * To retrieve these formats, allocate an array with the memory needed to store
  * @count_format_types formats. Point @format_type_ptr to this array and call
  * the ioctl again (with @count_format_types still set to the value returned in
  * the first ioctl call).
  */
 struct drm_mode_get_plane {
     /**
      * @plane_id: Object ID of the plane whose information should be
      * retrieved. Set by caller.
      */
     __u32 plane_id;
 
     /** @crtc_id: Object ID of the current CRTC. */
     __u32 crtc_id;
     /** @fb_id: Object ID of the current fb. */
     __u32 fb_id;
 
     /**
      * @possible_crtcs: Bitmask of CRTC's compatible with the plane. CRTC's
      * are created and they receive an index, which corresponds to their
      * position in the bitmask. Bit N corresponds to
      * :ref:`CRTC index<crtc_index>` N.
      */
     __u32 possible_crtcs;
     /** @gamma_size: Never used. */
     __u32 gamma_size;
 
     /** @count_format_types: Number of formats. */
     __u32 count_format_types;
     /**
      * @format_type_ptr: Pointer to ``__u32`` array of formats that are
      * supported by the plane. These formats do not require modifiers.
      */
     __u64 format_type_ptr;
 };
 
 struct drm_mode_get_plane_res {
     __u64 plane_id_ptr;
     __u32 count_planes;
 };
 
 #define DRM_MODE_ENCODER_NONE   0
 #define DRM_MODE_ENCODER_DAC    1
 #define DRM_MODE_ENCODER_TMDS   2
 #define DRM_MODE_ENCODER_LVDS   3
 #define DRM_MODE_ENCODER_TVDAC  4
 #define DRM_MODE_ENCODER_VIRTUAL 5
 #define DRM_MODE_ENCODER_DSI    6
 #define DRM_MODE_ENCODER_DPMST  7
 #define DRM_MODE_ENCODER_DPI    8
 
 struct drm_mode_get_encoder {
     __u32 encoder_id;
     __u32 encoder_type;
 
     __u32 crtc_id; /**< Id of crtc */
 
     __u32 possible_crtcs;
     __u32 possible_clones;
 };
 
 /* This is for connectors with multiple signal types. */
 /* Try to match DRM_MODE_CONNECTOR_X as closely as possible. */
 enum drm_mode_subconnector {
     DRM_MODE_SUBCONNECTOR_Automatic   = 0,  /* DVI-I, TV     */
     DRM_MODE_SUBCONNECTOR_Unknown     = 0,  /* DVI-I, TV, DP */
     DRM_MODE_SUBCONNECTOR_VGA     = 1,  /*            DP */
     DRM_MODE_SUBCONNECTOR_DVID    = 3,  /* DVI-I      DP */
     DRM_MODE_SUBCONNECTOR_DVIA    = 4,  /* DVI-I         */
     DRM_MODE_SUBCONNECTOR_Composite   = 5,  /*        TV     */
     DRM_MODE_SUBCONNECTOR_SVIDEO      = 6,  /*        TV     */
     DRM_MODE_SUBCONNECTOR_Component   = 8,  /*        TV     */
     DRM_MODE_SUBCONNECTOR_SCART   = 9,  /*        TV     */
     DRM_MODE_SUBCONNECTOR_DisplayPort = 10, /*            DP */
     DRM_MODE_SUBCONNECTOR_HDMIA       = 11, /*            DP */
     DRM_MODE_SUBCONNECTOR_Native      = 15, /*            DP */
     DRM_MODE_SUBCONNECTOR_Wireless    = 18, /*            DP */
 };
 
 #define DRM_MODE_CONNECTOR_Unknown  0
 #define DRM_MODE_CONNECTOR_VGA      1
 #define DRM_MODE_CONNECTOR_DVII     2
 #define DRM_MODE_CONNECTOR_DVID     3
 #define DRM_MODE_CONNECTOR_DVIA     4
 #define DRM_MODE_CONNECTOR_Composite    5
 #define DRM_MODE_CONNECTOR_SVIDEO   6
 #define DRM_MODE_CONNECTOR_LVDS     7
 #define DRM_MODE_CONNECTOR_Component    8
 #define DRM_MODE_CONNECTOR_9PinDIN  9
 #define DRM_MODE_CONNECTOR_DisplayPort  10
 #define DRM_MODE_CONNECTOR_HDMIA    11
 #define DRM_MODE_CONNECTOR_HDMIB    12
 #define DRM_MODE_CONNECTOR_TV       13
 #define DRM_MODE_CONNECTOR_eDP      14
 #define DRM_MODE_CONNECTOR_VIRTUAL      15
 #define DRM_MODE_CONNECTOR_DSI      16
 #define DRM_MODE_CONNECTOR_DPI      17
 #define DRM_MODE_CONNECTOR_WRITEBACK    18
 #define DRM_MODE_CONNECTOR_SPI      19
 #define DRM_MODE_CONNECTOR_USB      20
 
 /**
  * struct drm_mode_get_connector - Get connector metadata.
  *
  * User-space can perform a GETCONNECTOR ioctl to retrieve information about a
  * connector. User-space is expected to retrieve encoders, modes and properties
  * by performing this ioctl at least twice: the first time to retrieve the
  * number of elements, the second time to retrieve the elements themselves.
  *
  * To retrieve the number of elements, set @count_props and @count_encoders to
  * zero, set @count_modes to 1, and set @modes_ptr to a temporary struct
  * drm_mode_modeinfo element.
  *
  * To retrieve the elements, allocate arrays for @encoders_ptr, @modes_ptr,
  * @props_ptr and @prop_values_ptr, then set @count_modes, @count_props and
  * @count_encoders to their capacity.
  *
  * Performing the ioctl only twice may be racy: the number of elements may have
  * changed with a hotplug event in-between the two ioctls. User-space is
  * expected to retry the last ioctl until the number of elements stabilizes.
  * The kernel won't fill any array which doesn't have the expected length.
  *
  * **Force-probing a connector**
  *
  * If the @count_modes field is set to zero and the DRM client is the current
  * DRM master, the kernel will perform a forced probe on the connector to
  * refresh the connector status, modes and EDID. A forced-probe can be slow,
  * might cause flickering and the ioctl will block.
  *
  * User-space needs to force-probe connectors to ensure their metadata is
  * up-to-date at startup and after receiving a hot-plug event. User-space
  * may perform a forced-probe when the user explicitly requests it. User-space
  * shouldn't perform a forced-probe in other situations.
  */
 struct drm_mode_get_connector {
     /** @encoders_ptr: Pointer to ``__u32`` array of object IDs. */
     __u64 encoders_ptr;
     /** @modes_ptr: Pointer to struct drm_mode_modeinfo array. */
     __u64 modes_ptr;
     /** @props_ptr: Pointer to ``__u32`` array of property IDs. */
     __u64 props_ptr;
     /** @prop_values_ptr: Pointer to ``__u64`` array of property values. */
     __u64 prop_values_ptr;
 
     /** @count_modes: Number of modes. */
     __u32 count_modes;
     /** @count_props: Number of properties. */
     __u32 count_props;
     /** @count_encoders: Number of encoders. */
     __u32 count_encoders;
 
     /** @encoder_id: Object ID of the current encoder. */
     __u32 encoder_id;
     /** @connector_id: Object ID of the connector. */
     __u32 connector_id;
     /**
      * @connector_type: Type of the connector.
      *
      * See DRM_MODE_CONNECTOR_* defines.
      */
     __u32 connector_type;
     /**
      * @connector_type_id: Type-specific connector number.
      *
      * This is not an object ID. This is a per-type connector number. Each
      * (type, type_id) combination is unique across all connectors of a DRM
      * device.
      *
      * The (type, type_id) combination is not a stable identifier: the
      * type_id can change depending on the driver probe order.
      */
     __u32 connector_type_id;
 
     /**
      * @connection: Status of the connector.
      *
      * See enum drm_connector_status.
      */
     __u32 connection;
     /** @mm_width: Width of the connected sink in millimeters. */
     __u32 mm_width;
     /** @mm_height: Height of the connected sink in millimeters. */
     __u32 mm_height;
     /**
      * @subpixel: Subpixel order of the connected sink.
      *
      * See enum subpixel_order.
      */
     __u32 subpixel;
 
     /** @pad: Padding, must be zero. */
     __u32 pad;
 };
 
 #define DRM_MODE_PROP_PENDING   (1<<0) /* deprecated, do not use */
 #define DRM_MODE_PROP_RANGE (1<<1)
 #define DRM_MODE_PROP_IMMUTABLE (1<<2)
 #define DRM_MODE_PROP_ENUM  (1<<3) /* enumerated type with text strings */
 #define DRM_MODE_PROP_BLOB  (1<<4)
 #define DRM_MODE_PROP_BITMASK   (1<<5) /* bitmask of enumerated types */
 
 /* non-extended types: legacy bitmask, one bit per type: */
 #define DRM_MODE_PROP_LEGACY_TYPE  ( \
         DRM_MODE_PROP_RANGE | \
         DRM_MODE_PROP_ENUM | \
         DRM_MODE_PROP_BLOB | \
         DRM_MODE_PROP_BITMASK)
 
 /* extended-types: rather than continue to consume a bit per type,
  * grab a chunk of the bits to use as integer type id.
  */
 #define DRM_MODE_PROP_EXTENDED_TYPE 0x0000ffc0
 #define DRM_MODE_PROP_TYPE(n)       ((n) << 6)
 #define DRM_MODE_PROP_OBJECT        DRM_MODE_PROP_TYPE(1)
 #define DRM_MODE_PROP_SIGNED_RANGE  DRM_MODE_PROP_TYPE(2)
 
 /* the PROP_ATOMIC flag is used to hide properties from userspace that
  * is not aware of atomic properties.  This is mostly to work around
  * older userspace (DDX drivers) that read/write each prop they find,
  * without being aware that this could be triggering a lengthy modeset.
  */
 #define DRM_MODE_PROP_ATOMIC        0x80000000
 
 /**
  * struct drm_mode_property_enum - Description for an enum/bitfield entry.
  * @value: numeric value for this enum entry.
  * @name: symbolic name for this enum entry.
  *
  * See struct drm_property_enum for details.
  */
 struct drm_mode_property_enum {
     __u64 value;
     char name[DRM_PROP_NAME_LEN];
 };
 
 /**
  * struct drm_mode_get_property - Get property metadata.
  *
  * User-space can perform a GETPROPERTY ioctl to retrieve information about a
  * property. The same property may be attached to multiple objects, see
  * "Modeset Base Object Abstraction".
  *
  * The meaning of the @values_ptr field changes depending on the property type.
  * See &drm_property.flags for more details.
  *
  * The @enum_blob_ptr and @count_enum_blobs fields are only meaningful when the
  * property has the type &DRM_MODE_PROP_ENUM or &DRM_MODE_PROP_BITMASK. For
  * backwards compatibility, the kernel will always set @count_enum_blobs to
  * zero when the property has the type &DRM_MODE_PROP_BLOB. User-space must
  * ignore these two fields if the property has a different type.
  *
  * User-space is expected to retrieve values and enums by performing this ioctl
  * at least twice: the first time to retrieve the number of elements, the
  * second time to retrieve the elements themselves.
  *
  * To retrieve the number of elements, set @count_values and @count_enum_blobs
  * to zero, then call the ioctl. @count_values will be updated with the number
  * of elements. If the property has the type &DRM_MODE_PROP_ENUM or
  * &DRM_MODE_PROP_BITMASK, @count_enum_blobs will be updated as well.
  *
  * To retrieve the elements themselves, allocate an array for @values_ptr and
  * set @count_values to its capacity. If the property has the type
  * &DRM_MODE_PROP_ENUM or &DRM_MODE_PROP_BITMASK, allocate an array for
  * @enum_blob_ptr and set @count_enum_blobs to its capacity. Calling the ioctl
  * again will fill the arrays.
  */
 struct drm_mode_get_property {
     /** @values_ptr: Pointer to a ``__u64`` array. */
     __u64 values_ptr;
     /** @enum_blob_ptr: Pointer to a struct drm_mode_property_enum array. */
     __u64 enum_blob_ptr;
 
     /**
      * @prop_id: Object ID of the property which should be retrieved. Set
      * by the caller.
      */
     __u32 prop_id;
     /**
      * @flags: ``DRM_MODE_PROP_*`` bitfield. See &drm_property.flags for
      * a definition of the flags.
      */
     __u32 flags;
     /**
      * @name: Symbolic property name. User-space should use this field to
      * recognize properties.
      */
     char name[DRM_PROP_NAME_LEN];
 
     /** @count_values: Number of elements in @values_ptr. */
     __u32 count_values;
     /** @count_enum_blobs: Number of elements in @enum_blob_ptr. */
     __u32 count_enum_blobs;
 };
 
 struct drm_mode_connector_set_property {
     __u64 value;
     __u32 prop_id;
     __u32 connector_id;
 };
 
 #define DRM_MODE_OBJECT_CRTC 0xcccccccc
 #define DRM_MODE_OBJECT_CONNECTOR 0xc0c0c0c0
 #define DRM_MODE_OBJECT_ENCODER 0xe0e0e0e0
 #define DRM_MODE_OBJECT_MODE 0xdededede
 #define DRM_MODE_OBJECT_PROPERTY 0xb0b0b0b0
 #define DRM_MODE_OBJECT_FB 0xfbfbfbfb
 #define DRM_MODE_OBJECT_BLOB 0xbbbbbbbb
 #define DRM_MODE_OBJECT_PLANE 0xeeeeeeee
 #define DRM_MODE_OBJECT_COLOROP 0xfafafafa
 #define DRM_MODE_OBJECT_ANY 0
 
 struct drm_mode_obj_get_properties {
     __u64 props_ptr;
     __u64 prop_values_ptr;
     __u32 count_props;
     __u32 obj_id;
     __u32 obj_type;
 };
 
 struct drm_mode_obj_set_property {
     __u64 value;
     __u32 prop_id;
     __u32 obj_id;
     __u32 obj_type;
 };
 
 struct drm_mode_get_blob {
     __u32 blob_id;
     __u32 length;
     __u64 data;
 };
 
 struct drm_mode_fb_cmd {
     __u32 fb_id;
     __u32 width;
     __u32 height;
     __u32 pitch;
     __u32 bpp;
     __u32 depth;
     /* driver specific handle */
     __u32 handle;
 };
 
 #define DRM_MODE_FB_INTERLACED  (1<<0) /* for interlaced framebuffers */
 #define DRM_MODE_FB_MODIFIERS   (1<<1) /* enables ->modifier[] */
 
 /**
  * struct drm_mode_fb_cmd2 - Frame-buffer metadata.
  *
  * This struct holds frame-buffer metadata. There are two ways to use it:
  *
  * - User-space can fill this struct and perform a &DRM_IOCTL_MODE_ADDFB2
  *   ioctl to register a new frame-buffer. The new frame-buffer object ID will
  *   be set by the kernel in @fb_id.
  * - User-space can set @fb_id and perform a &DRM_IOCTL_MODE_GETFB2 ioctl to
  *   fetch metadata about an existing frame-buffer.
  *
  * In case of planar formats, this struct allows up to 4 buffer objects with
  * offsets and pitches per plane. The pitch and offset order are dictated by
  * the format FourCC as defined by ``drm_fourcc.h``, e.g. NV12 is described as:
  *
  *     YUV 4:2:0 image with a plane of 8-bit Y samples followed by an
  *     interleaved U/V plane containing 8-bit 2x2 subsampled colour difference
  *     samples.
  *
  * So it would consist of a Y plane at ``offsets[0]`` and a UV plane at
  * ``offsets[1]``.
  *
  * To accommodate tiled, compressed, etc formats, a modifier can be specified.
  * For more information see the "Format Modifiers" section. Note that even
  * though it looks like we have a modifier per-plane, we in fact do not. The
  * modifier for each plane must be identical. Thus all combinations of
  * different data layouts for multi-plane formats must be enumerated as
  * separate modifiers.
  *
  * All of the entries in @handles, @pitches, @offsets and @modifier must be
  * zero when unused. Warning, for @offsets and @modifier zero can't be used to
  * figure out whether the entry is used or not since it's a valid value (a zero
  * offset is common, and a zero modifier is &DRM_FORMAT_MOD_LINEAR).
  */
 struct drm_mode_fb_cmd2 {
     /** @fb_id: Object ID of the frame-buffer. */
     __u32 fb_id;
     /** @width: Width of the frame-buffer. */
     __u32 width;
     /** @height: Height of the frame-buffer. */
     __u32 height;
     /**
      * @pixel_format: FourCC format code, see ``DRM_FORMAT_*`` constants in
      * ``drm_fourcc.h``.
      */
     __u32 pixel_format;
     /**
      * @flags: Frame-buffer flags (see &DRM_MODE_FB_INTERLACED and
      * &DRM_MODE_FB_MODIFIERS).
      */
     __u32 flags;
 
     /**
      * @handles: GEM buffer handle, one per plane. Set to 0 if the plane is
      * unused. The same handle can be used for multiple planes.
      */
     __u32 handles[4];
     /** @pitches: Pitch (aka. stride) in bytes, one per plane. */
     __u32 pitches[4];
     /** @offsets: Offset into the buffer in bytes, one per plane. */
     __u32 offsets[4];
     /**
      * @modifier: Format modifier, one per plane. See ``DRM_FORMAT_MOD_*``
      * constants in ``drm_fourcc.h``. All planes must use the same
      * modifier. Ignored unless &DRM_MODE_FB_MODIFIERS is set in @flags.
      */
     __u64 modifier[4];
 };
 
 #define DRM_MODE_FB_DIRTY_ANNOTATE_COPY 0x01
 #define DRM_MODE_FB_DIRTY_ANNOTATE_FILL 0x02
 #define DRM_MODE_FB_DIRTY_FLAGS         0x03
 
 #define DRM_MODE_FB_DIRTY_MAX_CLIPS     256
 
 /*
  * Mark a region of a framebuffer as dirty.
  *
  * Some hardware does not automatically update display contents
  * as a hardware or software draw to a framebuffer. This ioctl
  * allows userspace to tell the kernel and the hardware what
  * regions of the framebuffer have changed.
  *
  * The kernel or hardware is free to update more then just the
  * region specified by the clip rects. The kernel or hardware
  * may also delay and/or coalesce several calls to dirty into a
  * single update.
  *
  * Userspace may annotate the updates, the annotates are a
  * promise made by the caller that the change is either a copy
  * of pixels or a fill of a single color in the region specified.
  *
  * If the DRM_MODE_FB_DIRTY_ANNOTATE_COPY flag is given then
  * the number of updated regions are half of num_clips given,
  * where the clip rects are paired in src and dst. The width and
  * height of each one of the pairs must match.
  *
  * If the DRM_MODE_FB_DIRTY_ANNOTATE_FILL flag is given the caller
  * promises that the region specified of the clip rects is filled
  * completely with a single color as given in the color argument.
  */
 
 struct drm_mode_fb_dirty_cmd {
     __u32 fb_id;
     __u32 flags;
     __u32 color;
     __u32 num_clips;
     __u64 clips_ptr;
 };
 
 struct drm_mode_mode_cmd {
     __u32 connector_id;
     struct drm_mode_modeinfo mode;
 };
 
 #define DRM_MODE_CURSOR_BO  0x01
 #define DRM_MODE_CURSOR_MOVE    0x02
 #define DRM_MODE_CURSOR_FLAGS   0x03
 
 /*
  * depending on the value in flags different members are used.
  *
  * CURSOR_BO uses
  *    crtc_id
  *    width
  *    height
  *    handle - if 0 turns the cursor off
  *
  * CURSOR_MOVE uses
  *    crtc_id
  *    x
  *    y
  */
 struct drm_mode_cursor {
     __u32 flags;
     __u32 crtc_id;
     __s32 x;
     __s32 y;
     __u32 width;
     __u32 height;
     /* driver specific handle */
     __u32 handle;
 };
 
 struct drm_mode_cursor2 {
     __u32 flags;
     __u32 crtc_id;
     __s32 x;
     __s32 y;
     __u32 width;
     __u32 height;
     /* driver specific handle */
     __u32 handle;
     __s32 hot_x;
     __s32 hot_y;
 };
 
 struct drm_mode_crtc_lut {
     __u32 crtc_id;
     __u32 gamma_size;
 
     /* pointers to arrays */
     __u64 red;
     __u64 green;
     __u64 blue;
 };
 
 struct drm_color_ctm {
     /*
      * Conversion matrix in S31.32 sign-magnitude
      * (not two's complement!) format.
      *
      * out   matrix    in
      * |R|   |0 1 2|   |R|
      * |G| = |3 4 5| x |G|
      * |B|   |6 7 8|   |B|
      */
     __u64 matrix[9];
 };
 
 struct drm_color_ctm_3x4 {
     /*
      * Conversion matrix with 3x4 dimensions in S31.32 sign-magnitude
      * (not two's complement!) format.
      *
      * out   matrix          in
      * |R|   |0  1  2  3 |   | R |
      * |G| = |4  5  6  7 | x | G |
      * |B|   |8  9  10 11|   | B |
      *                       |1.0|
      */
     __u64 matrix[12];
 };
 
 struct drm_color_lut {
     /*
      * Values are mapped linearly to 0.0 - 1.0 range, with 0x0 == 0.0 and
      * 0xffff == 1.0.
      */
     __u16 red;
     __u16 green;
     __u16 blue;
     __u16 reserved;
 };
 
 /*
  * struct drm_color_lut32
  *
  * 32-bit per channel color LUT entry, similar to drm_color_lut.
  */
 struct drm_color_lut32 {
     __u32 red;
     __u32 green;
     __u32 blue;
     __u32 reserved;
 };
 
 /**
  * enum drm_colorop_type - Type of color operation
  *
  * drm_colorops can be of many different types. Each type behaves differently
  * and defines a different set of properties. This enum defines all types and
  * gives a high-level description.
  */
 enum drm_colorop_type {
     /**
      * @DRM_COLOROP_1D_CURVE:
      *
      * enum string "1D Curve"
      *
      * A 1D curve that is being applied to all color channels. The
      * curve is specified via the CURVE_1D_TYPE colorop property.
      */
     DRM_COLOROP_1D_CURVE,
 
     /**
      * @DRM_COLOROP_1D_LUT:
      *
      * enum string "1D LUT"
      *
      * A simple 1D LUT of uniformly spaced &drm_color_lut32 entries,
      * packed into a blob via the DATA property. The driver's
      * expected LUT size is advertised via the SIZE property.
      *
      * The DATA blob is an array of struct drm_color_lut32 with size
      * of "size".
      */
     DRM_COLOROP_1D_LUT,
 
     /**
      * @DRM_COLOROP_CTM_3X4:
      *
      * enum string "3x4 Matrix"
      *
      * A 3x4 matrix. Its values are specified via the
      * &drm_color_ctm_3x4 struct provided via the DATA property.
      *
      * The DATA blob is a float[12]:
      * out   matrix          in
      * | R |   | 0  1  2  3  |   | R |
      * | G | = | 4  5  6  7  | x | G |
      * | B |   | 8  9  10 12 |   | B |
      */
     DRM_COLOROP_CTM_3X4,
 
     /**
      * @DRM_COLOROP_MULTIPLIER:
      *
      * enum string "Multiplier"
      *
      * A simple multiplier, applied to all color values. The
      * multiplier is specified as a S31.32 via the MULTIPLIER
      * property.
      */
     DRM_COLOROP_MULTIPLIER,
 
     /**
      * @DRM_COLOROP_3D_LUT:
      *
      * enum string "3D LUT"
      *
      * A 3D LUT of &drm_color_lut32 entries,
      * packed into a blob via the DATA property. The driver's expected
      * LUT size is advertised via the SIZE property, i.e., a 3D LUT with
      * 17x17x17 entries will have SIZE set to 17.
      *
      * The DATA blob is a 3D array of struct drm_color_lut32 with dimension
      * length of "size".
      * The LUT elements are traversed like so:
      *
      *   for B in range 0..n
      *     for G in range 0..n
      *       for R in range 0..n
      *        index = R + n * (G + n * B)
      *         color = lut3d[index]
      */
     DRM_COLOROP_3D_LUT,
 };
 
 /**
  * enum drm_colorop_lut3d_interpolation_type - type of 3DLUT interpolation
  */
 enum drm_colorop_lut3d_interpolation_type {
     /**
      * @DRM_COLOROP_LUT3D_INTERPOLATION_TETRAHEDRAL:
      *
      * Tetrahedral 3DLUT interpolation
      */
     DRM_COLOROP_LUT3D_INTERPOLATION_TETRAHEDRAL,
 };
 
 /**
  * enum drm_colorop_lut1d_interpolation_type - type of interpolation for 1D LUTs
  */
 enum drm_colorop_lut1d_interpolation_type {
     /**
      * @DRM_COLOROP_LUT1D_INTERPOLATION_LINEAR:
      *
      * Linear interpolation. Values between points of the LUT will be
      * linearly interpolated.
      */
     DRM_COLOROP_LUT1D_INTERPOLATION_LINEAR,
 };
 
 /**
  * struct drm_plane_size_hint - Plane size hints
  * @width: The width of the plane in pixel
  * @height: The height of the plane in pixel
  *
  * The plane SIZE_HINTS property blob contains an
  * array of struct drm_plane_size_hint.
  */
 struct drm_plane_size_hint {
     __u16 width;
     __u16 height;
 };
 
 /**
  * struct hdr_metadata_infoframe - HDR Metadata Infoframe Data.
  *
  * HDR Metadata Infoframe as per CTA 861.G spec. This is expected
  * to match exactly with the spec.
  *
  * Userspace is expected to pass the metadata information as per
  * the format described in this structure.
  */
 struct hdr_metadata_infoframe {
     /**
      * @eotf: Electro-Optical Transfer Function (EOTF)
      * used in the stream.
      */
     __u8 eotf;
     /**
      * @metadata_type: Static_Metadata_Descriptor_ID.
      */
     __u8 metadata_type;
     /**
      * @display_primaries: Color Primaries of the Data.
      * These are coded as unsigned 16-bit values in units of
      * 0.00002, where 0x0000 represents zero and 0xC350
      * represents 1.0000.
      * @display_primaries.x: X coordinate of color primary.
      * @display_primaries.y: Y coordinate of color primary.
      */
     struct {
         __u16 x, y;
     } display_primaries[3];
     /**
      * @white_point: White Point of Colorspace Data.
      * These are coded as unsigned 16-bit values in units of
      * 0.00002, where 0x0000 represents zero and 0xC350
      * represents 1.0000.
      * @white_point.x: X coordinate of whitepoint of color primary.
      * @white_point.y: Y coordinate of whitepoint of color primary.
      */
     struct {
         __u16 x, y;
     } white_point;
     /**
      * @max_display_mastering_luminance: Max Mastering Display Luminance.
      * This value is coded as an unsigned 16-bit value in units of 1 cd/m2,
      * where 0x0001 represents 1 cd/m2 and 0xFFFF represents 65535 cd/m2.
      */
     __u16 max_display_mastering_luminance;
     /**
      * @min_display_mastering_luminance: Min Mastering Display Luminance.
      * This value is coded as an unsigned 16-bit value in units of
      * 0.0001 cd/m2, where 0x0001 represents 0.0001 cd/m2 and 0xFFFF
      * represents 6.5535 cd/m2.
      */
     __u16 min_display_mastering_luminance;
     /**
      * @max_cll: Max Content Light Level.
      * This value is coded as an unsigned 16-bit value in units of 1 cd/m2,
      * where 0x0001 represents 1 cd/m2 and 0xFFFF represents 65535 cd/m2.
      */
     __u16 max_cll;
     /**
      * @max_fall: Max Frame Average Light Level.
      * This value is coded as an unsigned 16-bit value in units of 1 cd/m2,
      * where 0x0001 represents 1 cd/m2 and 0xFFFF represents 65535 cd/m2.
      */
     __u16 max_fall;
 };
 
 /**
  * struct hdr_output_metadata - HDR output metadata
  *
  * Metadata Information to be passed from userspace
  */
 struct hdr_output_metadata {
     /**
      * @metadata_type: Static_Metadata_Descriptor_ID.
      */
     __u32 metadata_type;
     /**
      * @hdmi_metadata_type1: HDR Metadata Infoframe.
      */
     union {
         struct hdr_metadata_infoframe hdmi_metadata_type1;
     };
 };
 
 /**
  * DRM_MODE_PAGE_FLIP_EVENT
  *
  * Request that the kernel sends back a vblank event (see
  * struct drm_event_vblank) with the &DRM_EVENT_FLIP_COMPLETE type when the
  * page-flip is done.
  *
  * When used with atomic uAPI, one event will be delivered per CRTC included in
  * the atomic commit. A CRTC is included in an atomic commit if one of its
  * properties is set, or if a property is set on a connector or plane linked
  * via the CRTC_ID property to the CRTC. At least one CRTC must be included,
  * and all pulled in CRTCs must be either previously or newly powered on (in
  * other words, a powered off CRTC which stays off cannot be included in the
  * atomic commit).
  */
 #define DRM_MODE_PAGE_FLIP_EVENT 0x01
 /**
  * DRM_MODE_PAGE_FLIP_ASYNC
  *
  * Request that the page-flip is performed as soon as possible, ie. with no
  * delay due to waiting for vblank. This may cause tearing to be visible on
  * the screen.
  *
  * When used with atomic uAPI, the driver will return an error if the hardware
  * doesn't support performing an asynchronous page-flip for this update.
  * User-space should handle this, e.g. by falling back to a regular page-flip.
  *
  * Note, some hardware might need to perform one last synchronous page-flip
  * before being able to switch to asynchronous page-flips. As an exception,
  * the driver will return success even though that first page-flip is not
  * asynchronous.
  */
 #define DRM_MODE_PAGE_FLIP_ASYNC 0x02
 #define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
 #define DRM_MODE_PAGE_FLIP_TARGET_RELATIVE 0x8
 #define DRM_MODE_PAGE_FLIP_TARGET (DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE | \
                    DRM_MODE_PAGE_FLIP_TARGET_RELATIVE)
 /**
  * DRM_MODE_PAGE_FLIP_FLAGS
  *
  * Bitmask of flags suitable for &drm_mode_crtc_page_flip_target.flags.
  */
 #define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT | \
                   DRM_MODE_PAGE_FLIP_ASYNC | \
                   DRM_MODE_PAGE_FLIP_TARGET)
 
 /*
  * Request a page flip on the specified crtc.
  *
  * This ioctl will ask KMS to schedule a page flip for the specified
  * crtc.  Once any pending rendering targeting the specified fb (as of
  * ioctl time) has completed, the crtc will be reprogrammed to display
  * that fb after the next vertical refresh.  The ioctl returns
  * immediately, but subsequent rendering to the current fb will block
  * in the execbuffer ioctl until the page flip happens.  If a page
  * flip is already pending as the ioctl is called, EBUSY will be
  * returned.
  *
  * Flag DRM_MODE_PAGE_FLIP_EVENT requests that drm sends back a vblank
  * event (see drm.h: struct drm_event_vblank) when the page flip is
  * done.  The user_data field passed in with this ioctl will be
  * returned as the user_data field in the vblank event struct.
  *
  * Flag DRM_MODE_PAGE_FLIP_ASYNC requests that the flip happen
  * 'as soon as possible', meaning that it not delay waiting for vblank.
  * This may cause tearing on the screen.
  *
  * The reserved field must be zero.
  */
 
 struct drm_mode_crtc_page_flip {
     __u32 crtc_id;
     __u32 fb_id;
     __u32 flags;
     __u32 reserved;
     __u64 user_data;
 };
 
 /*
  * Request a page flip on the specified crtc.
  *
  * Same as struct drm_mode_crtc_page_flip, but supports new flags and
  * re-purposes the reserved field:
  *
  * The sequence field must be zero unless either of the
  * DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags is specified. When
  * the ABSOLUTE flag is specified, the sequence field denotes the absolute
  * vblank sequence when the flip should take effect. When the RELATIVE
  * flag is specified, the sequence field denotes the relative (to the
  * current one when the ioctl is called) vblank sequence when the flip
  * should take effect. NOTE: DRM_IOCTL_WAIT_VBLANK must still be used to
  * make sure the vblank sequence before the target one has passed before
  * calling this ioctl. The purpose of the
  * DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags is merely to clarify
  * the target for when code dealing with a page flip runs during a
  * vertical blank period.
  */
 
 struct drm_mode_crtc_page_flip_target {
     __u32 crtc_id;
     __u32 fb_id;
     __u32 flags;
     __u32 sequence;
     __u64 user_data;
 };
 
 /**
  * struct drm_mode_create_dumb - Create a KMS dumb buffer for scanout.
  * @height: buffer height in pixels
  * @width: buffer width in pixels
  * @bpp: color mode
  * @flags: must be zero
  * @handle: buffer object handle
  * @pitch: number of bytes between two consecutive lines
  * @size: size of the whole buffer in bytes
  *
  * User-space fills @height, @width, @bpp and @flags. If the IOCTL succeeds,
  * the kernel fills @handle, @pitch and @size.
  *
  * The value of @bpp is a color-mode number describing a specific format
  * or a variant thereof. The value often corresponds to the number of bits
  * per pixel for most modes, although there are exceptions. Each color mode
  * maps to a DRM format plus a number of modes with similar pixel layout.
  * Framebuffer layout is always linear.
  *
  * Support for all modes and formats is optional. Even if dumb-buffer
  * creation with a certain color mode succeeds, it is not guaranteed that
  * the DRM driver supports any of the related formats. Most drivers support
  * a color mode of 32 with a format of DRM_FORMAT_XRGB8888 on their primary
  * plane.
  *
  * +------------+------------------------+------------------------+
  * | Color mode | Framebuffer format     | Compatible formats     |
  * +============+========================+========================+
  * |     32     |  * DRM_FORMAT_XRGB8888 |  * DRM_FORMAT_BGRX8888 |
  * |            |                        |  * DRM_FORMAT_RGBX8888 |
  * |            |                        |  * DRM_FORMAT_XBGR8888 |
  * +------------+------------------------+------------------------+
  * |     24     |  * DRM_FORMAT_RGB888   |  * DRM_FORMAT_BGR888   |
  * +------------+------------------------+------------------------+
  * |     16     |  * DRM_FORMAT_RGB565   |  * DRM_FORMAT_BGR565   |
  * +------------+------------------------+------------------------+
  * |     15     |  * DRM_FORMAT_XRGB1555 |  * DRM_FORMAT_BGRX1555 |
  * |            |                        |  * DRM_FORMAT_RGBX1555 |
  * |            |                        |  * DRM_FORMAT_XBGR1555 |
  * +------------+------------------------+------------------------+
  * |      8     |  * DRM_FORMAT_C8       |  * DRM_FORMAT_D8       |
  * |            |                        |  * DRM_FORMAT_R8       |
  * +------------+------------------------+------------------------+
  * |      4     |  * DRM_FORMAT_C4       |  * DRM_FORMAT_D4       |
  * |            |                        |  * DRM_FORMAT_R4       |
  * +------------+------------------------+------------------------+
  * |      2     |  * DRM_FORMAT_C2       |  * DRM_FORMAT_D2       |
  * |            |                        |  * DRM_FORMAT_R2       |
  * +------------+------------------------+------------------------+
  * |      1     |  * DRM_FORMAT_C1       |  * DRM_FORMAT_D1       |
  * |            |                        |  * DRM_FORMAT_R1       |
  * +------------+------------------------+------------------------+
  *
  * Color modes of 10, 12, 15, 30 and 64 are only supported for use by
  * legacy user space. Please don't use them in new code. Other modes
  * are not support.
  *
  * Do not attempt to allocate anything but linear framebuffer memory
  * with single-plane RGB data. Allocation of other framebuffer
  * layouts requires dedicated ioctls in the respective DRM driver.
  */
 struct drm_mode_create_dumb {
     __u32 height;
     __u32 width;
     __u32 bpp;
     __u32 flags;
 
     __u32 handle;
     __u32 pitch;
     __u64 size;
 };
 
 /* set up for mmap of a dumb scanout buffer */
 struct drm_mode_map_dumb {
     /** Handle for the object being mapped. */
     __u32 handle;
     __u32 pad;
     /**
      * Fake offset to use for subsequent mmap call
      *
      * This is a fixed-size type for 32/64 compatibility.
      */
     __u64 offset;
 };
 
 struct drm_mode_destroy_dumb {
     __u32 handle;
 };
 
 /**
  * DRM_MODE_ATOMIC_TEST_ONLY
  *
  * Do not apply the atomic commit, instead check whether the hardware supports
  * this configuration.
  *
  * See &drm_mode_config_funcs.atomic_check for more details on test-only
  * commits.
  */
 #define DRM_MODE_ATOMIC_TEST_ONLY 0x0100
 /**
  * DRM_MODE_ATOMIC_NONBLOCK
  *
  * Do not block while applying the atomic commit. The &DRM_IOCTL_MODE_ATOMIC
  * IOCTL returns immediately instead of waiting for the changes to be applied
  * in hardware. Note, the driver will still check that the update can be
  * applied before retuning.
  */
 #define DRM_MODE_ATOMIC_NONBLOCK  0x0200
 /**
  * DRM_MODE_ATOMIC_ALLOW_MODESET
  *
  * Allow the update to result in temporary or transient visible artifacts while
  * the update is being applied. Applying the update may also take significantly
  * more time than a page flip. All visual artifacts will disappear by the time
  * the update is completed, as signalled through the vblank event's timestamp
  * (see struct drm_event_vblank).
  *
  * This flag must be set when the KMS update might cause visible artifacts.
  * Without this flag such KMS update will return a EINVAL error. What kind of
  * update may cause visible artifacts depends on the driver and the hardware.
  * User-space that needs to know beforehand if an update might cause visible
  * artifacts can use &DRM_MODE_ATOMIC_TEST_ONLY without
  * &DRM_MODE_ATOMIC_ALLOW_MODESET to see if it fails.
  *
  * To the best of the driver's knowledge, visual artifacts are guaranteed to
  * not appear when this flag is not set. Some sinks might display visual
  * artifacts outside of the driver's control.
  */
 #define DRM_MODE_ATOMIC_ALLOW_MODESET 0x0400
 
 /**
  * DRM_MODE_ATOMIC_FLAGS
  *
  * Bitfield of flags accepted by the &DRM_IOCTL_MODE_ATOMIC IOCTL in
  * &drm_mode_atomic.flags.
  */
 #define DRM_MODE_ATOMIC_FLAGS (\
         DRM_MODE_PAGE_FLIP_EVENT |\
         DRM_MODE_PAGE_FLIP_ASYNC |\
         DRM_MODE_ATOMIC_TEST_ONLY |\
         DRM_MODE_ATOMIC_NONBLOCK |\
         DRM_MODE_ATOMIC_ALLOW_MODESET)
 
 struct drm_mode_atomic {
     __u32 flags;
     __u32 count_objs;
     __u64 objs_ptr;
     __u64 count_props_ptr;
     __u64 props_ptr;
     __u64 prop_values_ptr;
     __u64 reserved;
     __u64 user_data;
 };
 
 struct drm_format_modifier_blob {
 #define FORMAT_BLOB_CURRENT 1
     /* Version of this blob format */
     __u32 version;
 
     /* Flags */
     __u32 flags;
 
     /* Number of fourcc formats supported */
     __u32 count_formats;
 
     /* Where in this blob the formats exist (in bytes) */
     __u32 formats_offset;
 
     /* Number of drm_format_modifiers */
     __u32 count_modifiers;
 
     /* Where in this blob the modifiers exist (in bytes) */
     __u32 modifiers_offset;
 
     /* __u32 formats[] */
     /* struct drm_format_modifier modifiers[] */
 };
 
 struct drm_format_modifier {
     /* Bitmask of formats in get_plane format list this info applies to. The
      * offset allows a sliding window of which 64 formats (bits).
      *
      * Some examples:
      * In today's world with < 65 formats, and formats 0, and 2 are
      * supported
      * 0x0000000000000005
      *        ^-offset = 0, formats = 5
      *
      * If the number formats grew to 128, and formats 98-102 are
      * supported with the modifier:
      *
      * 0x0000007c00000000 0000000000000000
      *        ^
      *        |__offset = 64, formats = 0x7c00000000
      *
      */
     __u64 formats;
     __u32 offset;
     __u32 pad;
 
     /* The modifier that applies to the >get_plane format list bitmask. */
     __u64 modifier;
 };
 
 /**
  * struct drm_mode_create_blob - Create New blob property
  *
  * Create a new 'blob' data property, copying length bytes from data pointer,
  * and returning new blob ID.
  */
 struct drm_mode_create_blob {
     /** @data: Pointer to data to copy. */
     __u64 data;
     /** @length: Length of data to copy. */
     __u32 length;
     /** @blob_id: Return: new property ID. */
     __u32 blob_id;
 };
 
 /**
  * struct drm_mode_destroy_blob - Destroy user blob
  * @blob_id: blob_id to destroy
  *
  * Destroy a user-created blob property.
  *
  * User-space can release blobs as soon as they do not need to refer to them by
  * their blob object ID.  For instance, if you are using a MODE_ID blob in an
  * atomic commit and you will not make another commit re-using the same ID, you
  * can destroy the blob as soon as the commit has been issued, without waiting
  * for it to complete.
  */
 struct drm_mode_destroy_blob {
     __u32 blob_id;
 };
 
 /**
  * struct drm_mode_create_lease - Create lease
  *
  * Lease mode resources, creating another drm_master.
  *
  * The @object_ids array must reference at least one CRTC, one connector and
  * one plane if &DRM_CLIENT_CAP_UNIVERSAL_PLANES is enabled. Alternatively,
  * the lease can be completely empty.
  */
 struct drm_mode_create_lease {
     /** @object_ids: Pointer to array of object ids (__u32) */
     __u64 object_ids;
     /** @object_count: Number of object ids */
     __u32 object_count;
     /** @flags: flags for new FD (O_CLOEXEC, etc) */
     __u32 flags;
 
     /** @lessee_id: Return: unique identifier for lessee. */
     __u32 lessee_id;
     /** @fd: Return: file descriptor to new drm_master file */
     __u32 fd;
 };
 
 /**
  * struct drm_mode_list_lessees - List lessees
  *
  * List lesses from a drm_master.
  */
 struct drm_mode_list_lessees {
     /**
      * @count_lessees: Number of lessees.
      *
      * On input, provides length of the array.
      * On output, provides total number. No
      * more than the input number will be written
      * back, so two calls can be used to get
      * the size and then the data.
      */
     __u32 count_lessees;
     /** @pad: Padding. */
     __u32 pad;
 
     /**
      * @lessees_ptr: Pointer to lessees.
      *
      * Pointer to __u64 array of lessee ids
      */
     __u64 lessees_ptr;
 };
 
 /**
  * struct drm_mode_get_lease - Get Lease
  *
  * Get leased objects.
  */
 struct drm_mode_get_lease {
     /**
      * @count_objects: Number of leased objects.
      *
      * On input, provides length of the array.
      * On output, provides total number. No
      * more than the input number will be written
      * back, so two calls can be used to get
      * the size and then the data.
      */
     __u32 count_objects;
     /** @pad: Padding. */
     __u32 pad;
 
     /**
      * @objects_ptr: Pointer to objects.
      *
      * Pointer to __u32 array of object ids.
      */
     __u64 objects_ptr;
 };
 
 /**
  * struct drm_mode_revoke_lease - Revoke lease
  */
 struct drm_mode_revoke_lease {
     /** @lessee_id: Unique ID of lessee */
     __u32 lessee_id;
 };
 
 /**
  * struct drm_mode_rect - Two dimensional rectangle.
  * @x1: Horizontal starting coordinate (inclusive).
  * @y1: Vertical starting coordinate (inclusive).
  * @x2: Horizontal ending coordinate (exclusive).
  * @y2: Vertical ending coordinate (exclusive).
  *
  * With drm subsystem using struct drm_rect to manage rectangular area this
  * export it to user-space.
  *
  * Currently used by drm_mode_atomic blob property FB_DAMAGE_CLIPS.
  */
 struct drm_mode_rect {
     __s32 x1;
     __s32 y1;
     __s32 x2;
     __s32 y2;
 };
 
 /**
  * struct drm_mode_closefb
  * @fb_id: Framebuffer ID.
  * @pad: Must be zero.
  */
 struct drm_mode_closefb {
     __u32 fb_id;
     __u32 pad;
 };
 
 #if defined(__cplusplus)
 }
 #endif
 
 #endif

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