egl: Expose access to DeviceList

In order to not have the different dri2 platforms all build
lists of available devices, use the device list provided by EGL.

Signed-off-by: Robert Foss <rfoss@kernel.org>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23742>

src/egl/main/egldevice.c

@@ -198,6 +198,26 @@ out:
    return dev;
 }
 
+#ifdef HAVE_LIBDRM
+drmDevicePtr
+_eglDeviceDrm(_EGLDevice *dev)
+{
+   if (!dev)
+      return NULL;
+
+   return dev->device;
+}
+#endif
+
+_EGLDevice *
+_eglDeviceNext(_EGLDevice *dev)
+{
+   if (!dev)
+      return NULL;
+
+   return dev->Next;
+}
+
 EGLBoolean
 _eglDeviceSupports(_EGLDevice *dev, _EGLDeviceExtension ext)
 {

src/egl/main/egldevice.h

@@ -30,6 +30,10 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+#ifdef HAVE_LIBDRM
+#include <xf86drm.h>
+#endif
+
 #include "egltypedefs.h"
 
 #ifdef __cplusplus
@@ -64,6 +68,16 @@ enum _egl_device_extension {
 
 typedef enum _egl_device_extension _EGLDeviceExtension;
 
+#ifdef HAVE_LIBDRM
+drmDevicePtr
+_eglDeviceDrm(_EGLDevice *dev);
+#else
+#define _eglDeviceDrm(dev) NULL
+#endif
+
+_EGLDevice *
+_eglDeviceNext(_EGLDevice *dev);
+
 EGLBoolean
 _eglDeviceSupports(_EGLDevice *dev, _EGLDeviceExtension ext);