gpu: nvgpu: Abstract rw_semaphore implementation

Abstract implementation of rw_semaphore. In Linux it's implemented
in terms of rw_semaphore. Change deterministic_busy to use the new
implementation.

JIRA NVGPU-259

Change-Id: Ia9c1b6e397581bff7711c5ab6fb76ef6d23cff87
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1570405
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 70 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/linux/rwsem.h b/drivers/gpu/nvgpu/include/nvgpu/linux/rwsem.h
new file mode 100644
index 00000000..7d073d39
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/linux/rwsem.h
@@ -0,0 +1,26 @@
+/*
+ * 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_RWSEM_LINUX_H__
+#define __NVGPU_RWSEM_LINUX_H__
+
+#include <linux/rwsem.h>
+
+struct nvgpu_rwsem {
+        struct rw_semaphore rwsem;
+};
+
+#endif
diff --git a/drivers/gpu/nvgpu/include/nvgpu/rwsem.h b/drivers/gpu/nvgpu/include/nvgpu/rwsem.h
new file mode 100644
index 00000000..d37c11a8
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/rwsem.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __NVGPU_RWSEM_H__
+#define __NVGPU_RWSEM_H__
+
+#ifdef __KERNEL__
+#include <nvgpu/linux/rwsem.h>
+#endif
+
+/*
+ * struct nvgpu_rwsem
+ *
+ * Should be implemented per-OS in a separate library
+ * But implementation should adhere to rw_semaphore implementation
+ * as specified in Linux Documentation
+ */
+struct nvgpu_rwsem;
+
+void nvgpu_rwsem_init(struct nvgpu_rwsem *rwsem);
+void nvgpu_rwsem_up_read(struct nvgpu_rwsem *rwsem);
+void nvgpu_rwsem_down_read(struct nvgpu_rwsem *rwsem);
+void nvgpu_rwsem_up_write(struct nvgpu_rwsem *rwsem);
+void nvgpu_rwsem_down_write(struct nvgpu_rwsem *rwsem);
+
+#endif