C++ (Cpp) x86_reserve_hardware Examples

Example #1

File: bts.c Project: bobcao3/linux

static int bts_event_init(struct perf_event *event)
{
	int ret;

	if (event->attr.type != bts_pmu.type)
		return -ENOENT;

	if (x86_add_exclusive(x86_lbr_exclusive_bts))
		return -EBUSY;

	/*
	 * BTS leaks kernel addresses even when CPL0 tracing is
	 * disabled, so disallow intel_bts driver for unprivileged
	 * users on paranoid systems since it provides trace data
	 * to the user in a zero-copy fashion.
	 *
	 * Note that the default paranoia setting permits unprivileged
	 * users to profile the kernel.
	 */
	if (event->attr.exclude_kernel && perf_paranoid_kernel() &&
	    !capable(CAP_SYS_ADMIN))
		return -EACCES;

	ret = x86_reserve_hardware();
	if (ret) {
		x86_del_exclusive(x86_lbr_exclusive_bts);
		return ret;
	}

	event->destroy = bts_event_destroy;

	return 0;
}

Example #2

File: perf_event_intel_bts.c Project: Seagate/SMR_FS-EXT4

static int bts_event_init(struct perf_event *event)
{
	int ret;

	if (event->attr.type != bts_pmu.type)
		return -ENOENT;

	if (x86_add_exclusive(x86_lbr_exclusive_bts))
		return -EBUSY;

	ret = x86_reserve_hardware();
	if (ret) {
		x86_del_exclusive(x86_lbr_exclusive_bts);
		return ret;
	}

	event->destroy = bts_event_destroy;

	return 0;
}