gpu: nvgpu: Add common vaddr translate function

Add a function to do address translation for IOMMU capable GPUs.
When an iGPU is behind and IOMMU it can pick whether to use that
IOMMU for translation by adding a bit to physical addresses. This
function takes care of that.

However, this required an abstracted nvgpu_iommuable() API to
check whether a GPU is behind an IOMMU. This patch adds that API
for Linux.

JIRA NVGPU-68

Change-Id: I489d14475167c019c294407372395df78c8b5feb
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1542965
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index dc1e9688..3d1f8d28 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -1276,8 +1276,7 @@ u64 gk20a_mm_smmu_vaddr_translate(struct gk20a *g, u64 iova)
         /* ensure it is not vidmem allocation */
         WARN_ON(is_vidmem_page_alloc(iova));
 
-        if (device_is_iommuable(dev_from_gk20a(g)) &&
-                        g->ops.mm.get_physical_addr_bits)
+        if (nvgpu_iommuable(g) && g->ops.mm.get_physical_addr_bits)
                 return iova | 1ULL << g->ops.mm.get_physical_addr_bits(g);
 
         return iova;