From 5cbfb69b7ee41507e0ca24c0bc8c7da446784267 Mon Sep 17 00:00:00 2001
From: Terje Bergstrom <tbergstrom@nvidia.com>
Date: Tue, 25 Apr 2017 12:56:38 -0700
Subject: gpu: nvgpu: Abstract condition variable

Add implementation for an abstracted condition variable. Implement it
using wait queue in Linux.

JIRA NVGPU-14

Change-Id: I211c590cca940ffc31d6c52141689f23f231e7da
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1469763
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
---
 drivers/gpu/nvgpu/common/linux/cond.c | 73 +++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 drivers/gpu/nvgpu/common/linux/cond.c

(limited to 'drivers/gpu/nvgpu/common/linux')

diff --git a/drivers/gpu/nvgpu/common/linux/cond.c b/drivers/gpu/nvgpu/common/linux/cond.c
new file mode 100644
index 00000000..633c34fd
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/linux/cond.c
@@ -0,0 +1,73 @@
+/*
+ * 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/>.
+ */
+
+#include <linux/wait.h>
+#include <linux/sched.h>
+
+#include <nvgpu/cond.h>
+
+int nvgpu_cond_init(struct nvgpu_cond *cond)
+{
+	init_waitqueue_head(&cond->wq);
+	cond->initialized = true;
+
+	return 0;
+}
+
+void nvgpu_cond_destroy(struct nvgpu_cond *cond)
+{
+	cond->initialized = false;
+}
+
+int nvgpu_cond_signal(struct nvgpu_cond *cond)
+{
+	if (!cond->initialized)
+		return -EINVAL;
+
+	wake_up(&cond->wq);
+
+	return 0;
+}
+
+int nvgpu_cond_signal_interruptible(struct nvgpu_cond *cond)
+{
+	if (!cond->initialized)
+		return -EINVAL;
+
+	wake_up_interruptible(&cond->wq);
+
+	return 0;
+}
+
+int nvgpu_cond_broadcast(struct nvgpu_cond *cond)
+{
+	if (!cond->initialized)
+		return -EINVAL;
+
+	wake_up_all(&cond->wq);
+
+	return 0;
+}
+
+int nvgpu_cond_broadcast_interruptible(struct nvgpu_cond *cond)
+{
+	if (!cond->initialized)
+		return -EINVAL;
+
+	wake_up_interruptible_all(&cond->wq);
+
+	return 0;
+}
-- 
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