Buffer manager:

Implement a version check IOCTL for drivers that don't use
drmMMInit from user-space.
Remove the minor check from the kernel code. That's really up
to the driver.
Bump major.

libdrm/xf86drm.c

@@ -2855,6 +2855,30 @@ int drmMMUnlock(int fd, unsigned memType, int unlockBM)
     return (ret) ? -errno : 0;
 }
 
+int drmBOVersion(int fd, unsigned int *major,
+		 unsigned int *minor,
+		 unsigned int *patchlevel)
+{
+    struct drm_bo_version_arg arg;
+    int ret;
+
+    memset(&arg, 0, sizeof(arg));
+    ret = ioctl(fd, DRM_IOCTL_BO_VERSION, &arg);
+    if (ret)
+	return ret;
+
+    if (major)
+	*major = arg.major;
+    if (minor)
+	*minor = arg.minor;
+    if (patchlevel)
+	*patchlevel = arg.patchlevel;
+
+    return (ret) ? -errno : 0;
+}
+
+
+
 #define DRM_MAX_FDS 16
 static struct {
     char *BusID;

linux-core/drm_bo.c

@@ -2260,17 +2260,10 @@ int drm_mm_init_ioctl(struct drm_device *dev, void *data, struct drm_file *file_
 	}
 	if (arg->major != DRM_BO_INIT_MAJOR) {
 		DRM_ERROR("libdrm and kernel DRM buffer object interface major\n"
-			  "\tversion don't match. Got %d, expected %d,\n",
+			  "\tversion don't match. Got %d, expected %d.\n",
 			  arg->major, DRM_BO_INIT_MAJOR);
 		return -EINVAL;
 	}
-	if (arg->minor > DRM_BO_INIT_MINOR) {
-		DRM_ERROR("libdrm expects a newer DRM buffer object interface.\n"
-			  "\tlibdrm buffer object interface version is %d.%d.\n"
-			  "\tkernel DRM buffer object interface version is %d.%d\n",
-			  arg->major, arg->minor, DRM_BO_INIT_MAJOR, DRM_BO_INIT_MINOR);
-		return -EINVAL;
-	}
 
 	mutex_lock(&dev->struct_mutex);
 	if (!bm->initialized) {
@@ -2535,3 +2528,15 @@ static int drm_bo_setup_vm_locked(struct drm_buffer_object * bo)
 
 	return 0;
 }
+
+int drm_bo_version_ioctl(struct drm_device *dev, void *data, 
+			 struct drm_file *file_priv)
+{
+	struct drm_bo_version_arg *arg = (struct drm_bo_version_arg *)data;
+	
+	arg->major = DRM_BO_INIT_MAJOR;
+	arg->minor = DRM_BO_INIT_MINOR;
+	arg->patchlevel = DRM_BO_INIT_PATCH;
+
+	return 0;
+}

linux-core/drm_drv.c

@@ -145,6 +145,7 @@ static struct drm_ioctl_desc drm_ioctls[] = {
 	DRM_IOCTL_DEF(DRM_IOCTL_BO_SETSTATUS, drm_bo_setstatus_ioctl, DRM_AUTH),
 	DRM_IOCTL_DEF(DRM_IOCTL_BO_INFO, drm_bo_info_ioctl, DRM_AUTH),
 	DRM_IOCTL_DEF(DRM_IOCTL_BO_WAIT_IDLE, drm_bo_wait_idle_ioctl, DRM_AUTH),
+	DRM_IOCTL_DEF(DRM_IOCTL_BO_VERSION, drm_bo_version_ioctl, 0),
 };
 
 #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )

linux-core/drm_objects.h

@@ -483,6 +483,7 @@ extern int drm_mm_init_ioctl(struct drm_device *dev, void *data, struct drm_file
 extern int drm_mm_takedown_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
 extern int drm_mm_lock_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
 extern int drm_mm_unlock_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+extern int drm_bo_version_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
 extern int drm_bo_driver_finish(struct drm_device *dev);
 extern int drm_bo_driver_init(struct drm_device *dev);
 extern int drm_bo_pci_offset(struct drm_device *dev,

shared-core/drm.h

@@ -758,8 +758,9 @@ struct drm_fence_arg {
 #define DRM_BO_HINT_WAIT_LAZY   0x00000008
 
 #define DRM_BO_INIT_MAGIC 0xfe769812
-#define DRM_BO_INIT_MAJOR 0
+#define DRM_BO_INIT_MAJOR 1
 #define DRM_BO_INIT_MINOR 1
+#define DRM_BO_INIT_PATCH 0
 
 
 struct drm_bo_info_req {
@@ -873,6 +874,12 @@ struct drm_bo_op_arg {
 #define DRM_BO_LOCK_UNLOCK_BM       (1 << 0)
 #define DRM_BO_LOCK_IGNORE_NO_EVICT (1 << 1)
 
+struct drm_bo_version_arg {
+	uint32_t major;
+	uint32_t minor;
+	uint32_t patchlevel;
+};
+
 struct drm_mm_type_arg {
 	unsigned int mem_type;
         unsigned int lock_flags;
@@ -976,6 +983,7 @@ struct drm_mm_init_arg {
 #define DRM_IOCTL_BO_SETSTATUS          DRM_IOWR(0xd3, struct drm_bo_map_wait_idle_arg)
 #define DRM_IOCTL_BO_INFO               DRM_IOWR(0xd4, struct drm_bo_reference_info_arg)
 #define DRM_IOCTL_BO_WAIT_IDLE          DRM_IOWR(0xd5, struct drm_bo_map_wait_idle_arg)
+#define DRM_IOCTL_BO_VERSION          DRM_IOR(0xd6, struct drm_bo_version_arg)
 
 
 /*@}*/