Quelle  hv-common.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#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 hv_gpci_system_performance_capabilities caps;
 } __packed __aligned(sizeof(uint64_t));

 struct p arg = {
  .params = {
   .counter_request = cpu_to_be32(
    HV_GPCI_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 & HV_GPCI_CM_GA);
 caps->expanded = !!(arg.caps.capability_mask & HV_GPCI_CM_EXPANDED);
 caps->lab = !!(arg.caps.capability_mask & HV_GPCI_CM_LAB);

 return r;
}