kernel/arch/powerpc/perf/hv-common.c

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