#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <linux/ioctl.h>
#include <linux/types.h>

#include <kms++/kms++.h>

struct sw_sync_create_fence_data {
	__u32	value;
	char	name[32];
	__s32	fence; /* fd of new fence */
};

#define SW_SYNC_IOC_MAGIC		'W'
#define SW_SYNC_IOC_CREATE_FENCE	_IOWR(SW_SYNC_IOC_MAGIC, 0, struct sw_sync_create_fence_data)
#define SW_SYNC_IOC_INC			_IOW (SW_SYNC_IOC_MAGIC, 1, __u32)

using namespace std;

namespace kms
{

SWSyncTimeline::SWSyncTimeline()
	: m_value(0)
{
	m_fd = open("/sys/kernel/debug/sync/sw_sync", 0);
	if (m_fd == -1)
		throw std::runtime_error("Failed to open sw_sync file");
}

SWSyncTimeline::~SWSyncTimeline()
{
	close(m_fd);
}

SWSync *SWSyncTimeline::createFence(uint32_t value)
{
	struct sw_sync_create_fence_data data = { value };
	int ret;

	ret = ioctl(m_fd, SW_SYNC_IOC_CREATE_FENCE, &data);
	if (ret < 0)
		return NULL;

	return new SWSync(data.fence);
}

void SWSyncTimeline::signal(uint32_t value)
{
	ioctl(m_fd, SW_SYNC_IOC_INC, &value);
	m_value += value;
}

SWSync::SWSync(int fd)
	: m_fd(fd)
{
}

SWSync::~SWSync()
{
	close(m_fd);
}

}