drm/vmwgfx: Improve on IOMMU detection

 **************************************************************************/

#include <linux/module.h>

#include <linux/console.h>

#include <linux/dma-mapping.h>

#include <drm/drmP.h>

#include "vmwgfx_drv.h"

#include <drm/ttm/ttm_placement.h>

#include <drm/ttm/ttm_bo_driver.h>

#include <drm/ttm/ttm_module.h>

#include <linux/intel-iommu.h>

#define VMWGFX_DRIVER_DESC "Linux drm driver for VMware graphics devices"

#define VMWGFX_CHIP_SVGAII 0

	dev_priv->initial_height = height;

}

/**

 * vmw_assume_iommu - Figure out whether coherent dma-remapping might be

 * taking place.

 * @dev: Pointer to the struct drm_device.

 *

 * Return: true if iommu present, false otherwise.

 */

static bool vmw_assume_iommu(struct drm_device *dev)

{

	const struct dma_map_ops *ops = get_dma_ops(dev->dev);

	return !dma_is_direct(ops) && ops &&

		ops->map_page != dma_direct_map_page;

}

/**

 * vmw_dma_select_mode - Determine how DMA mappings should be set up for this

 * system.

	if (vmw_force_coherent)

		dev_priv->map_mode = vmw_dma_alloc_coherent;

	else if (intel_iommu_enabled)

	else if (vmw_assume_iommu(dev_priv->dev))

		dev_priv->map_mode = vmw_dma_map_populate;

	else if (!vmw_force_iommu)

		dev_priv->map_mode = vmw_dma_phys;