Add drmModeGetFB2

Add a wrapper around the getfb2 ioctl, which returns extended
framebuffer information mirroring addfb2, including multiple planes and
modifiers.

Changes since v7:
 - add new symbols to core-symbol.txt (Eric Engestrom)

Changes since v5:
 - style change

Changes since v4:
 - Set fb_id at init instead of memclear() and set (Eric Engestrom)

Changes since v3:
 - remove unnecessary null check in drmModeFreeFB2 (Daniel Stone)

Changes since v2:
 - getfb2 ioctl has been merged upstream
 - sync include/drm/drm.h in a seperate patch

Changes since v1:
 - functions should be drm_public
 - modifier should be 64 bits
 - update ioctl number

Signed-off-by: Juston Li <juston.li@intel.com>
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>

core-symbols.txt

@@ -112,6 +112,7 @@ drmModeFreeConnector
 drmModeFreeCrtc
 drmModeFreeEncoder
 drmModeFreeFB
+drmModeFreeFB2
 drmModeFreeModeInfo
 drmModeFreeObjectProperties
 drmModeFreePlane
@@ -124,6 +125,7 @@ drmModeGetConnectorCurrent
 drmModeGetCrtc
 drmModeGetEncoder
 drmModeGetFB
+drmModeGetFB2
 drmModeGetLease
 drmModeGetPlane
 drmModeGetPlaneResources

xf86drmMode.c

@@ -1594,3 +1594,38 @@ drmModeRevokeLease(int fd, uint32_t lessee_id)
 		return 0;
 	return -errno;
 }
+
+drm_public drmModeFB2Ptr
+drmModeGetFB2(int fd, uint32_t fb_id)
+{
+	struct drm_mode_fb_cmd2 get = {
+		.fb_id = fb_id,
+	};
+	drmModeFB2Ptr ret;
+	int err;
+
+	err = DRM_IOCTL(fd, DRM_IOCTL_MODE_GETFB2, &get);
+	if (err != 0)
+		return NULL;
+
+	ret = drmMalloc(sizeof(drmModeFB2));
+	if (!ret)
+		return NULL;
+
+	ret->fb_id = fb_id;
+	ret->width = get.width;
+	ret->height = get.height;
+	ret->pixel_format = get.pixel_format;
+	ret->flags = get.flags;
+	ret->modifier = get.modifier[0];
+	memcpy(ret->handles, get.handles, sizeof(uint32_t) * 4);
+	memcpy(ret->pitches, get.pitches, sizeof(uint32_t) * 4);
+	memcpy(ret->offsets, get.offsets, sizeof(uint32_t) * 4);
+
+	return ret;
+}
+
+drm_public void drmModeFreeFB2(drmModeFB2Ptr ptr)
+{
+	drmFree(ptr);
+}

xf86drmMode.h

@@ -225,6 +225,19 @@ typedef struct _drmModeFB {
 	uint32_t handle;
 } drmModeFB, *drmModeFBPtr;
 
+typedef struct _drmModeFB2 {
+	uint32_t fb_id;
+	uint32_t width, height;
+	uint32_t pixel_format; /* fourcc code from drm_fourcc.h */
+	uint64_t modifier; /* applies to all buffers */
+	uint32_t flags;
+
+	/* per-plane GEM handle; may be duplicate entries for multiple planes */
+	uint32_t handles[4];
+	uint32_t pitches[4]; /* bytes */
+	uint32_t offsets[4]; /* bytes */
+} drmModeFB2, *drmModeFB2Ptr;
+
 typedef struct drm_clip_rect drmModeClip, *drmModeClipPtr;
 
 typedef struct _drmModePropertyBlob {
@@ -343,6 +356,7 @@ typedef struct _drmModePlaneRes {
 extern void drmModeFreeModeInfo( drmModeModeInfoPtr ptr );
 extern void drmModeFreeResources( drmModeResPtr ptr );
 extern void drmModeFreeFB( drmModeFBPtr ptr );
+extern void drmModeFreeFB2( drmModeFB2Ptr ptr );
 extern void drmModeFreeCrtc( drmModeCrtcPtr ptr );
 extern void drmModeFreeConnector( drmModeConnectorPtr ptr );
 extern void drmModeFreeEncoder( drmModeEncoderPtr ptr );
@@ -362,6 +376,7 @@ extern drmModeResPtr drmModeGetResources(int fd);
  * Retrieve information about framebuffer bufferId
  */
 extern drmModeFBPtr drmModeGetFB(int fd, uint32_t bufferId);
+extern drmModeFB2Ptr drmModeGetFB2(int fd, uint32_t bufferId);
 
 /**
  * Creates a new framebuffer with an buffer object as its scanout buffer.