/*
   *  Copyright © 2015 Broadcom
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  /* DOC: VC4 GEM BO management support.
   *
   * The VC4 GPU architecture (both scanout and rendering) has direct
   * access to system memory with no MMU in between.  To support it, we
   * use the GEM CMA helper functions to allocate contiguous ranges of
   * physical memory for our BOs.
   */
  
  #include "vc4_drv.h"
  
  struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
  {
  	struct drm_gem_cma_object *cma_obj;
  
  	cma_obj = drm_gem_cma_create(dev, size);
  	if (IS_ERR(cma_obj))
  		return NULL;
  	else
  		return to_vc4_bo(&cma_obj->base);
  }
  
  int vc4_dumb_create(struct drm_file *file_priv,
  		    struct drm_device *dev,
  		    struct drm_mode_create_dumb *args)
  {
  	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  	struct vc4_bo *bo = NULL;
  	int ret;
  
  	if (args->pitch < min_pitch)
  		args->pitch = min_pitch;
  
  	if (args->size < args->pitch * args->height)
  		args->size = args->pitch * args->height;
  
  	bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
  	if (!bo)
  		return -ENOMEM;
  
  	ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
  	drm_gem_object_unreference_unlocked(&bo->base.base);
  
  	return ret;
  }