gpu: nvgpu: SMMU bypass

Improve GMMU mapping code to cope with discontiguous buffers.

Add debugfs entry that allows bypassing SMMU and disabling big pages.

Bug 1605769

Change-Id: I14d32c62293a16ff8c7195377c75a85fa8061083
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/717503
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/737533
Reviewed-by: Alexander Van Brunt <avanbrunt@nvidia.com>
Tested-by: Alexander Van Brunt <avanbrunt@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index f6806309..895e52ff 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -210,7 +210,9 @@ struct gk20a_mmu_level {
         int (*update_entry)(struct vm_gk20a *vm,
                            struct gk20a_mm_entry *pte,
                            u32 i, u32 gmmu_pgsz_idx,
-                           u64 iova,
+                           struct scatterlist **sgl,
+                           u64 *offset,
+                           u64 *iova,
                            u32 kind_v, u32 *ctag,
                            bool cacheable, bool unmapped_pte,
                            int rw_flag, bool sparse, u32 flags);
@@ -303,6 +305,8 @@ struct mm_gk20a {
 #ifdef CONFIG_DEBUG_FS
         u32 ltc_enabled;
         u32 ltc_enabled_debug;
+        u32 bypass_smmu;
+        u32 disable_bigpage;
 #endif
 };