gpu: nvgpu: Nvgpu abstraction for linux barriers.

construct wrapper nvgpu_* methods to replace
mb,rmb,wmb,smp_mb,smp_rmb,smp_wmb,read_barrier_depends and
smp_read_barrier_depends.

NVGPU-122

Change-Id: I8d24dd70fef5cb0fadaacc15f3ab11531667a0df
Signed-off-by: Debarshi <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1541199
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/gpu/nvgpu/common/mm/gmmu.c b/drivers/gpu/nvgpu/common/mm/gmmu.c
index 73dff2c3..7f486d68 100644
--- a/drivers/gpu/nvgpu/common/mm/gmmu.c
+++ b/drivers/gpu/nvgpu/common/mm/gmmu.c
@@ -21,6 +21,7 @@
 #include <nvgpu/nvgpu_mem.h>
 #include <nvgpu/enabled.h>
 #include <nvgpu/page_allocator.h>
+#include <nvgpu/barrier.h>
 
 #include "gk20a/gk20a.h"
 #include "gk20a/mm_gk20a.h"
@@ -164,8 +165,8 @@ int nvgpu_gmmu_init_page_table(struct vm_gk20a *vm)
                 return err;
 
         /*
-         * One mb() is done after all mapping operations. Don't need individual
-         * barriers for each PD write.
+         * One nvgpu_smp_mb() is done after all mapping operations. Don't need
+         * individual barriers for each PD write.
          */
         vm->pdb.mem->skip_wmb = true;
 
@@ -259,8 +260,8 @@ static int pd_allocate(struct vm_gk20a *vm,
         }
 
         /*
-         * One mb() is done after all mapping operations. Don't need individual
-         * barriers for each PD write.
+         * One nvgpu_smp_mb() is done after all mapping operations. Don't need
+         * individual barriers for each PD write.
          */
         pd->mem->skip_wmb = true;
 
@@ -714,7 +715,7 @@ static int __nvgpu_gmmu_update_page_table(struct vm_gk20a *vm,
                                                             attrs);
 
         unmap_gmmu_pages(g, &vm->pdb);
-        mb();
+        nvgpu_smp_mb();
 
         __gmmu_dbg(g, attrs, "%-5s Done!", sgt ? "MAP" : "UNMAP");
 
@@ -983,7 +984,7 @@ int __nvgpu_set_pte(struct gk20a *g, struct vm_gk20a *vm, u64 vaddr, u32 *pte)
          * There probably also needs to be a TLB invalidate as well but we leave
          * that to the caller of this function.
          */
-        wmb();
+        nvgpu_smp_wmb();
 
         return 0;
 }