LXR linux/arch/powerpc/perf/hv-common.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <asm/io.h>
   3#include <asm/hvcall.h>
   4
   5#include "hv-gpci.h"
   6#include "hv-common.h"
   7
   8unsigned long hv_perf_caps_get(struct hv_perf_caps *caps)
   9{
  10        unsigned long r;
  11        struct p {
  12                struct hv_get_perf_counter_info_params params;
  13                struct hv_gpci_system_performance_capabilities caps;
  14        } __packed __aligned(sizeof(uint64_t));
  15
  16        struct p arg = {
  17                .params = {
  18                        .counter_request = cpu_to_be32(
  19                                HV_GPCI_system_performance_capabilities),
  20                        .starting_index = cpu_to_be32(-1),
  21                        .counter_info_version_in = 0,
  22                }
  23        };
  24
  25        r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
  26                               virt_to_phys(&arg), sizeof(arg));
  27
  28        if (r)
  29                return r;
  30
  31        pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask);
  32
  33        caps->version = arg.params.counter_info_version_out;
  34        caps->collect_privileged = !!arg.caps.perf_collect_privileged;
  35        caps->ga = !!(arg.caps.capability_mask & HV_GPCI_CM_GA);
  36        caps->expanded = !!(arg.caps.capability_mask & HV_GPCI_CM_EXPANDED);
  37        caps->lab = !!(arg.caps.capability_mask & HV_GPCI_CM_LAB);
  38
  39        return r;
  40}
  41