gpu: nvgpu: Remove gk20a sparse texture & PTE freeing

Remove support for gk20a sparse textures. We're using implementation
from user space, so gk20a code is never invoked.

Also removes ref_cnt for PTEs, so we never free PTEs when unmapping
pages, but only at VM delete time.

Change-Id: I04d7d43d9bff23ee46fd0570ad189faece35dd14
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/663294

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index 4dbde580..b3564409 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -193,7 +193,6 @@ struct page_table_gk20a {
         /* Either a *page or a *mem_handle */
         void *ref;
         /* track mapping cnt on this page table */
-        u32 ref_cnt;
         struct sg_table *sgt;
         size_t size;
 };
@@ -308,10 +307,6 @@ struct vm_gk20a {
 
         struct list_head reserved_va_list;
 
-        dma_addr_t zero_page_iova;
-        void *zero_page_cpuva;
-        struct sg_table *zero_page_sgt;
-
 #ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
         u64 handle;
 #endif