drm/ttm: add ioctl to get back memory managed area sized

taken from modesetting branch but could be useful outside it.

libdrm/xf86drm.c

@@ -2871,6 +2871,21 @@ int drmMMUnlock(int fd, unsigned memType, int unlockBM)
     return drmIoctlTimeout(fd, DRM_IOCTL_MM_UNLOCK, &arg);
 }
 
+int drmMMInfo(int fd, unsigned memType, uint64_t *size)
+{
+    struct drm_mm_info_arg arg;
+
+    memset(&arg, 0, sizeof(arg));
+    
+    arg.mem_type = memType;
+
+    if (ioctl(fd, DRM_IOCTL_MM_INFO, &arg))
+	return -errno;
+
+    *size = arg.p_size;
+    return 0;
+}
+
 int drmBOVersion(int fd, unsigned int *major,
 		 unsigned int *minor,
 		 unsigned int *patchlevel)

libdrm/xf86mm.h

@@ -172,6 +172,7 @@ extern int drmMMInit(int fd, unsigned long pOffset, unsigned long pSize,
 extern int drmMMTakedown(int fd, unsigned memType);
 extern int drmMMLock(int fd, unsigned memType, int lockBM, int ignoreNoEvict);
 extern int drmMMUnlock(int fd, unsigned memType, int unlockBM);
+extern int drmMMInfo(int fd, unsigned memType, uint64_t *size);
 extern int drmBOSetStatus(int fd, drmBO *buf, 
 			  uint64_t flags, uint64_t mask,
 			  unsigned int hint, 

linux-core/drm_bo.c

@@ -2283,6 +2283,7 @@ int drm_bo_init_mm(struct drm_device *dev,
 	}
 	man->has_type = 1;
 	man->use_type = 1;
+	man->size = p_size;
 
 	INIT_LIST_HEAD(&man->lru);
 	INIT_LIST_HEAD(&man->pinned);
@@ -2553,6 +2554,42 @@ int drm_mm_unlock_ioctl(struct drm_device *dev,
 	return 0;
 }
 
+int drm_mm_info_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct drm_mm_info_arg *arg = data;
+	struct drm_buffer_manager *bm = &dev->bm;
+	struct drm_bo_driver *driver = dev->driver->bo_driver;
+	struct drm_mem_type_manager *man;
+	int ret = 0;
+	int mem_type = arg->mem_type;
+
+	if (!driver) {
+		DRM_ERROR("Buffer objects are not supported by this driver\n");
+		return -EINVAL;
+	}
+
+	if (mem_type >= DRM_BO_MEM_TYPES) {
+		DRM_ERROR("Illegal memory type %d\n", arg->mem_type);
+		return -EINVAL;
+	}
+
+	mutex_lock(&dev->struct_mutex);
+	if (!bm->initialized) {
+		DRM_ERROR("DRM memory manager was not initialized\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+
+	man = &bm->man[arg->mem_type];
+
+	arg->p_size = man->size;
+
+out:
+	mutex_unlock(&dev->struct_mutex);
+     
+	return ret;
+}
 /*
  * buffer object vm functions.
  */

linux-core/drm_drv.c

@@ -148,6 +148,8 @@ static struct drm_ioctl_desc drm_ioctls[] = {
 	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),
+
+	DRM_IOCTL_DEF(DRM_IOCTL_MM_INFO, drm_mm_info_ioctl, 0),
 };
 
 #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )

linux-core/drm_objects.h

@@ -525,6 +525,7 @@ struct drm_mem_type_manager {
 	unsigned long io_offset;
 	unsigned long io_size;
 	void *io_addr;
+	uint64_t size; /* size of managed area for reporting to userspace */
 };
 
 struct drm_bo_lock {
@@ -651,6 +652,7 @@ 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_mm_info_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);

shared-core/drm.h

@@ -955,6 +955,11 @@ struct drm_mm_init_arg {
 	uint64_t p_size;
 };
 
+struct drm_mm_info_arg {
+	unsigned int mem_type;
+	uint64_t p_size;
+};
+
 /**
  * \name Ioctls Definitions
  */
@@ -1046,6 +1051,7 @@ struct drm_mm_init_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)
+#define DRM_IOCTL_MM_INFO               DRM_IOWR(0xd7, struct drm_mm_info_arg)
 
 /*@}*/