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>

2 files changed, 73 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/barrier.h b/drivers/gpu/nvgpu/include/nvgpu/barrier.h
new file mode 100644
index 00000000..26eec3ed
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/barrier.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This file contains NVGPU_* high-level abstractions for various
+ * memor-barrier operations available in linux/kernel. Every OS
+ * should provide their own OS specific calls under this common API
+ */
+
+#ifndef __NVGPU_BARRIER_H__
+#define __NVGPU_BARRIER_H__
+
+#ifdef __KERNEL__
+#include <nvgpu/linux/barrier.h>
+#endif
+
+#define nvgpu_mb()      __nvgpu_mb()
+#define nvgpu_rmb()     __nvgpu_rmb()
+#define nvgpu_wmb()     __nvgpu_wmb()
+
+#define nvgpu_smp_mb()  __nvgpu_smp_mb()
+#define nvgpu_smp_rmb() __nvgpu_smp_rmb()
+#define nvgpu_smp_wmb() __nvgpu_smp_wmb()
+
+#define nvgpu_read_barrier_depends() __nvgpu_read_barrier_depends()
+#define nvgpu_smp_read_barrier_depends() __nvgpu_smp_read_barrier_depends()
+
+#endif /* __NVGPU_BARRIER_H__ */
diff --git a/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h b/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h
new file mode 100644
index 00000000..e7b83ee8
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVGPU_BARRIER_LINUX_H__
+#define __NVGPU_BARRIER_LINUX_H__
+
+#include <asm/barrier.h>
+
+#define __nvgpu_mb()    mb()
+#define __nvgpu_rmb()   rmb()
+#define __nvgpu_wmb()   wmb()
+
+#define __nvgpu_smp_mb()        smp_mb()
+#define __nvgpu_smp_rmb()       smp_rmb()
+#define __nvgpu_smp_wmb()       smp_wmb()
+
+#define __nvgpu_read_barrier_depends()  read_barrier_depends()
+#define __nvgpu_smp_read_barrier_depends()      smp_read_barrier_depends()
+
+#endif /* __NVGPU_BARRIER_LINUX_H__ */