amdkfd: Implement the Get Clock Counters IOCTL

static long kfd_ioctl_get_clock_counters(struct file *filep,

				struct kfd_process *p, void __user *arg)

{

	return -ENODEV;

	struct kfd_ioctl_get_clock_counters_args args;

	struct kfd_dev *dev;

	struct timespec time;

	if (copy_from_user(&args, arg, sizeof(args)))

		return -EFAULT;

	dev = kfd_device_by_id(args.gpu_id);

	if (dev == NULL)

		return -EINVAL;

	/* Reading GPU clock counter from KGD */

	args.gpu_clock_counter = kfd2kgd->get_gpu_clock_counter(dev->kgd);

	/* No access to rdtsc. Using raw monotonic time */

	getrawmonotonic(&time);

	args.cpu_clock_counter = (uint64_t)timespec_to_ns(&time);

	get_monotonic_boottime(&time);

	args.system_clock_counter = (uint64_t)timespec_to_ns(&time);

	/* Since the counter is in nano-seconds we use 1GHz frequency */

	args.system_clock_freq = 1000000000;

	if (copy_to_user(arg, &args, sizeof(args)))

		return -EFAULT;

	return 0;

}