[PATCH] iommu: map reserved memory as cacheable if device is coherent

[Jason Gunthorpe]

On Wed, Jul 26, 2023 at 03:50:59PM +0300, laurentiu.tudor at nxp.com wrote:
> From: Laurentiu Tudor <laurentiu.tudor at nxp.com>
> 
> Check if the device is marked as DMA coherent in the DT and if so,
> map its reserved memory as cacheable in the IOMMU.
> This fixes the recently added IOMMU reserved memory support which
> uses IOMMU_RESV_DIRECT without properly building the PROT for the
> mapping.
> 
> Fixes: a5bf3cfce8cb ("iommu: Implement of_iommu_get_resv_regions()")
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor at nxp.com>
> ---
>  drivers/iommu/of_iommu.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason