/*
 * Copyright (c) 2018, 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 <nvgpu/types.h>
#include <nvgpu/os_fence.h>
#include <nvgpu/linux/os_fence_android.h>
#include <nvgpu/gk20a.h>
#include <nvgpu/channel.h>

#include "../drivers/staging/android/sync.h"

inline struct sync_fence *nvgpu_get_sync_fence(struct nvgpu_os_fence *s)
{
	struct sync_fence *fence = (struct sync_fence *)s->priv;
	return fence;
}

static void nvgpu_os_fence_clear(struct nvgpu_os_fence *fence_out)
{
	fence_out->priv = NULL;
	fence_out->g = NULL;
	fence_out->ops = NULL;
}

void nvgpu_os_fence_init(struct nvgpu_os_fence *fence_out,
	struct gk20a *g, const struct nvgpu_os_fence_ops *fops,
	struct sync_fence *fence)
{
	fence_out->g = g;
	fence_out->ops = fops;
	fence_out->priv = (void *)fence;
}

void nvgpu_os_fence_android_drop_ref(struct nvgpu_os_fence *s)
{
	struct sync_fence *fence = nvgpu_get_sync_fence(s);

	sync_fence_put(fence);

	nvgpu_os_fence_clear(s);
}

void nvgpu_os_fence_android_install_fd(struct nvgpu_os_fence *s, int fd)
{
	struct sync_fence *fence = nvgpu_get_sync_fence(s);

	sync_fence_get(fence);
	sync_fence_install(fence, fd);
}

int nvgpu_os_fence_fdget(struct nvgpu_os_fence *fence_out,
	struct channel_gk20a *c, int fd)
{
	int err = -ENOSYS;

#ifdef CONFIG_TEGRA_GK20A_NVHOST
	err = nvgpu_os_fence_syncpt_fdget(fence_out, c, fd);
#endif

	if (err)
		err = nvgpu_os_fence_sema_fdget(fence_out, c, fd);

	if (err)
		nvgpu_err(c->g, "error obtaining fence from fd %d", fd);

	return err;
}