instead of relying on intel_iommu_enabled, use the fact that the dma_map_ops::map_page != dma_direct_map_page.
Signed-off-by: Thomas Hellstrom thellstrom@vmware.com --- v2: Merge fixes and typo fix in commit message. Also check for ops being non-NULL before dereferencing it. --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index ae9df4432bfc..7ef5dcb06104 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -26,6 +26,7 @@ **************************************************************************/ #include <linux/module.h> #include <linux/console.h> +#include <linux/dma-mapping.h>
#include <drm/drmP.h> #include "vmwgfx_drv.h" @@ -34,7 +35,6 @@ #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 @@ -545,6 +545,21 @@ static void vmw_get_initial_size(struct vmw_private *dev_priv) 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. @@ -568,7 +583,7 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
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;