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, 6 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_gk20a.h b/drivers/gpu/nvgpu/gk20a/platform_gk20a.h
index f4301dab..f142cb9f 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/platform_gk20a.h
@@ -76,6 +76,12 @@ struct gk20a_platform {
         /* Adaptative ELPG: true = enable flase = disable */
         bool enable_aelpg;
 
+        /* Enable SMMU bypass by default */
+        bool bypass_smmu;
+
+        /* Disable big page support */
+        bool disable_bigpage;
+
         /*
          * gk20a_do_idle() API can take GPU either into rail gate or CAR reset
          * This flag can be used to force CAR reset case instead of rail gate