/*
 * Copyright (c) 2014-2020, 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.
 */

#include <nvgpu/nvhost.h>
#include <nvgpu/fence.h>
#include <nvgpu/fence_syncpt.h>
#include "fence_priv.h"

static int nvgpu_fence_syncpt_wait(struct nvgpu_fence_type *f, u32 timeout)
{
	struct nvgpu_fence_type_priv *pf = &f->priv;

	return nvgpu_nvhost_syncpt_wait_timeout_ext(
			pf->nvhost_device, pf->syncpt_id, pf->syncpt_value,
			timeout, NVGPU_NVHOST_DEFAULT_WAITER);
}

static bool nvgpu_fence_syncpt_is_expired(struct nvgpu_fence_type *f)
{
	struct nvgpu_fence_type_priv *pf = &f->priv;

	/*
	 * In cases we don't register a notifier, we can't expect the
	 * syncpt value to be updated. For this case, we force a read
	 * of the value from HW, and then check for expiration.
	 */
	if (!nvgpu_nvhost_syncpt_is_expired_ext(pf->nvhost_device,
				pf->syncpt_id, pf->syncpt_value)) {
		int err;
		u32 val;

		err = nvgpu_nvhost_syncpt_read_ext_check(pf->nvhost_device,
				pf->syncpt_id, &val);
		WARN(err != 0, "syncpt read failed??");
		if (err == 0) {
			return nvgpu_nvhost_syncpt_is_expired_ext(
					pf->nvhost_device,
					pf->syncpt_id, pf->syncpt_value);
		} else {
			return false;
		}
	}

	return true;
}

static void nvgpu_fence_syncpt_release(struct nvgpu_fence_type *f)
{
}

static const struct nvgpu_fence_ops nvgpu_fence_syncpt_ops = {
	.wait = nvgpu_fence_syncpt_wait,
	.is_expired = nvgpu_fence_syncpt_is_expired,
	.release = nvgpu_fence_syncpt_release,
};

/* This function takes the ownership of the os_fence */
void nvgpu_fence_from_syncpt(
		struct nvgpu_fence_type *f,
		struct nvgpu_nvhost_dev *nvhost_device,
		u32 id, u32 value, struct nvgpu_os_fence os_fence)
{
	struct nvgpu_fence_type_priv *pf = &f->priv;

	nvgpu_fence_init(f, &nvgpu_fence_syncpt_ops, os_fence);

	pf->nvhost_device = nvhost_device;
	pf->syncpt_id = id;
	pf->syncpt_value = value;
}
