gpu: nvgpu: Make buf alignment generic

Drastically simplify and move the aligment computation for buffers
getting mapped into the SGT code. An SGT is all that is needed for
computing the alignment.

However, this did require that a new SGT op was added:

  nvgpu_sgt_iommuable()

This function returns true if the passed SGT is IOMMU'able and must
be implemented by an SGT implementation that has IOMMU'able buffers.
If this function is left as NULL then it is assumed that the buffer
is not IOMMU'able.

Also cleanup the parameter ordering convention among all nvgpu_sgt
functions. Previously there was a mishmash of different parameter
orderings. This patch now standardizes on the gk20a first approach
seen everywhere else in the driver.

JIRA NVGPU-30
JIRA NVGPU-246
JIRA NVGPU-71

Change-Id: Ic4ab7b752847cf795c7cfafed5a07818217bba86
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1583985
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/common/mm/gmmu.c b/drivers/gpu/nvgpu/common/mm/gmmu.c
index 875bcc4e..4289104d 100644
--- a/drivers/gpu/nvgpu/common/mm/gmmu.c
+++ b/drivers/gpu/nvgpu/common/mm/gmmu.c
@@ -93,7 +93,7 @@ static u64 __nvgpu_gmmu_map(struct vm_gk20a *vm,
                                    aperture);
         nvgpu_mutex_release(&vm->update_gmmu_lock);
 
-        nvgpu_sgt_free(sgt, g);
+        nvgpu_sgt_free(g, sgt);
 
         if (!vaddr) {
                 nvgpu_err(g, "failed to map buffer!");
@@ -500,7 +500,7 @@ static int __nvgpu_gmmu_do_update_page_table(struct vm_gk20a *vm,
          * IO address and will be contiguous.
          */
         if (attrs->aperture == APERTURE_SYSMEM && !g->mm.bypass_smmu) {
-                u64 io_addr = nvgpu_sgt_get_gpu_addr(sgt, g, sgt->sgl, attrs);
+                u64 io_addr = nvgpu_sgt_get_gpu_addr(g, sgt, sgt->sgl, attrs);
 
                 io_addr += space_to_skip;