powerpc/perf: Add a shared interface to get gpci version and capabilities

#include <asm/io.h>

#include <asm/hvcall.h>

#include "hv-gpci.h"

#include "hv-common.h"

unsigned long hv_perf_caps_get(struct hv_perf_caps *caps)

{

	unsigned long r;

	struct p {

		struct hv_get_perf_counter_info_params params;

		struct cv_system_performance_capabilities caps;

	} __packed __aligned(sizeof(uint64_t));

	struct p arg = {

		.params = {

			.counter_request = cpu_to_be32(

					CIR_SYSTEM_PERFORMANCE_CAPABILITIES),

			.starting_index = cpu_to_be32(-1),

			.counter_info_version_in = 0,

		}

	};

	r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,

			       virt_to_phys(&arg), sizeof(arg));

	if (r)

		return r;

	pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask);

	caps->version = arg.params.counter_info_version_out;

	caps->collect_privileged = !!arg.caps.perf_collect_privileged;

	caps->ga = !!(arg.caps.capability_mask & CV_CM_GA);

	caps->expanded = !!(arg.caps.capability_mask & CV_CM_EXPANDED);

	caps->lab = !!(arg.caps.capability_mask & CV_CM_LAB);

	return r;

}

#ifndef LINUX_POWERPC_PERF_HV_COMMON_H_

#define LINUX_POWERPC_PERF_HV_COMMON_H_

#include <linux/types.h>

struct hv_perf_caps {

	u16 version;

	u16 collect_privileged:1,

	    ga:1,

	    expanded:1,

	    lab:1,

	    unused:12;

};

unsigned long hv_perf_caps_get(struct hv_perf_caps *caps);

#endif