/*

 * Copyright (c) 2012, 2018 SAP SE. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "libperfstat_aix.hpp"

#include "misc_aix.hpp"

#include <dlfcn.h>

// Handle to the libperfstat.

static void* g_libhandle = NULL;

typedef int (*fun_perfstat_cpu_total_t) (perfstat_id_t *name, PERFSTAT_CPU_TOTAL_T_LATEST* userbuff,

                                         int sizeof_userbuff, int desired_number);

typedef int (*fun_perfstat_memory_total_t) (perfstat_id_t *name, perfstat_memory_total_t* userbuff,

                                            int sizeof_userbuff, int desired_number);

typedef int (*fun_perfstat_partition_total_t) (perfstat_id_t *name,

    PERFSTAT_PARTITON_TOTAL_T_LATEST* userbuff, int sizeof_userbuff,

    int desired_number);

typedef int (*fun_perfstat_wpar_total_t) (perfstat_id_wpar_t *name,

    PERFSTAT_WPAR_TOTAL_T_LATEST* userbuff, int sizeof_userbuff,

    int desired_number);

typedef void (*fun_perfstat_reset_t) ();

typedef cid_t (*fun_wpar_getcid_t) ();

static fun_perfstat_cpu_total_t     g_fun_perfstat_cpu_total = NULL;

static fun_perfstat_memory_total_t  g_fun_perfstat_memory_total = NULL;

static fun_perfstat_partition_total_t g_fun_perfstat_partition_total = NULL;

static fun_perfstat_wpar_total_t    g_fun_perfstat_wpar_total = NULL;

static fun_perfstat_reset_t         g_fun_perfstat_reset = NULL;

static fun_wpar_getcid_t            g_fun_wpar_getcid = NULL;

bool libperfstat::init() {

  // Dynamically load the libperfstat porting library.

  g_libhandle = dlopen("/usr/lib/libperfstat.a(shr_64.o)", RTLD_MEMBER | RTLD_NOW);

  if (!g_libhandle) {

    trcVerbose("Cannot load libperfstat.a (dlerror: %s)", dlerror());

    return false;

  }

  // Resolve function pointers

#define RESOLVE_FUN_NO_ERROR(name) \

  g_fun_##name = (fun_##name##_t) dlsym(g_libhandle, #name);

#define RESOLVE_FUN(name) \

  RESOLVE_FUN_NO_ERROR(name) \

  if (!g_fun_##name) { \

    trcVerbose("Cannot resolve " #name "() from libperfstat.a\n" \

                      "   (dlerror: %s)", dlerror()); \

    return false; \

  }

  // These functions may or may not be there depending on the OS release.

  RESOLVE_FUN_NO_ERROR(perfstat_partition_total);

  RESOLVE_FUN_NO_ERROR(perfstat_wpar_total);

  RESOLVE_FUN_NO_ERROR(wpar_getcid);

  // These functions are required for every release.

  RESOLVE_FUN(perfstat_cpu_total);

  RESOLVE_FUN(perfstat_memory_total);

  RESOLVE_FUN(perfstat_reset);

  trcVerbose("libperfstat loaded.");

  return true;

}

void libperfstat::cleanup() {

  if (g_libhandle) {

    dlclose(g_libhandle);

    g_libhandle = NULL;

  }

  g_fun_perfstat_cpu_total = NULL;

  g_fun_perfstat_memory_total = NULL;

  g_fun_perfstat_partition_total = NULL;

  g_fun_perfstat_wpar_total = NULL;

  g_fun_perfstat_reset = NULL;

  g_fun_wpar_getcid = NULL;

}

int libperfstat::perfstat_memory_total(perfstat_id_t *name,

                                       perfstat_memory_total_t* userbuff,

                                       int sizeof_userbuff, int desired_number) {

  if (g_fun_perfstat_memory_total == NULL) {

    return -1;

  }

  return g_fun_perfstat_memory_total(name, userbuff, sizeof_userbuff, desired_number);

}

int libperfstat::perfstat_cpu_total(perfstat_id_t *name, PERFSTAT_CPU_TOTAL_T_LATEST* userbuff,

                                    int sizeof_userbuff, int desired_number) {

  if (g_fun_perfstat_cpu_total == NULL) {

    return -1;

  }

  return g_fun_perfstat_cpu_total(name, userbuff, sizeof_userbuff, desired_number);

}

int libperfstat::perfstat_partition_total(perfstat_id_t *name, PERFSTAT_PARTITON_TOTAL_T_LATEST* userbuff,

                                          int sizeof_userbuff, int desired_number) {

  if (g_fun_perfstat_partition_total == NULL) {

    return -1;

  }

  return g_fun_perfstat_partition_total(name, userbuff, sizeof_userbuff, desired_number);

}

int libperfstat::perfstat_wpar_total(perfstat_id_wpar_t *name, PERFSTAT_WPAR_TOTAL_T_LATEST* userbuff,

                                     int sizeof_userbuff, int desired_number) {

  if (g_fun_perfstat_wpar_total == NULL) {

    return -1;

  }

  return g_fun_perfstat_wpar_total(name, userbuff, sizeof_userbuff, desired_number);

}

void libperfstat::perfstat_reset() {

  if (g_fun_perfstat_reset != NULL) {

    g_fun_perfstat_reset();

  }

}

cid_t libperfstat::wpar_getcid() {

  if (g_fun_wpar_getcid == NULL) {

    return (cid_t) -1;

  }

  return g_fun_wpar_getcid();

}

//////////////////// convenience functions, release-independent /////////////////////////////

// Retrieve global cpu information.

bool libperfstat::get_cpuinfo(cpuinfo_t* pci) {

  assert(pci, "get_cpuinfo: invalid parameter");

  memset(pci, 0, sizeof(cpuinfo_t));

  PERFSTAT_CPU_TOTAL_T_LATEST psct;

  memset (&psct, '\0', sizeof(psct));

  if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(PERFSTAT_CPU_TOTAL_T_LATEST), 1)) {

    if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t_71), 1)) {

      if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t_61), 1)) {

        if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t_53), 1)) {

          trcVerbose("perfstat_cpu_total() failed (errno=%d)", errno);

          return false;

        }

      }

    }

  }

  // Global cpu information.

  strcpy(pci->description, psct.description);

  pci->processorHZ = psct.processorHZ;

  pci->ncpus = psct.ncpus;

  for (int i = 0; i < 3; i++) {

    pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);

  }

  pci->user_clock_ticks = psct.user;

  pci->sys_clock_ticks  = psct.sys;

  pci->idle_clock_ticks = psct.idle;

  pci->wait_clock_ticks = psct.wait;

  return true;

}

// Retrieve partition information.

bool libperfstat::get_partitioninfo(partitioninfo_t* ppi) {

  assert(ppi, "get_partitioninfo: invalid parameter");

  memset(ppi, 0, sizeof(partitioninfo_t));

  PERFSTAT_PARTITON_TOTAL_T_LATEST pspt;

  memset(&pspt, '\0', sizeof(pspt));

  bool ame_details = true;

  if (-1 == libperfstat::perfstat_partition_total(NULL, &pspt, sizeof(PERFSTAT_PARTITON_TOTAL_T_LATEST), 1)) {

    if (-1 == libperfstat::perfstat_partition_total(NULL, &pspt, sizeof(perfstat_partition_total_t_71), 1)) {

      ame_details = false;

      if (-1 == libperfstat::perfstat_partition_total(NULL, &pspt, sizeof(perfstat_partition_total_t_61), 1)) {

        if (-1 == libperfstat::perfstat_partition_total(NULL, &pspt, sizeof(perfstat_partition_total_t_53), 1)) {

          if (-1 == libperfstat::perfstat_partition_total(NULL, &pspt, sizeof(perfstat_partition_total_t_53_5), 1)) {

            trcVerbose("perfstat_partition_total() failed (errno=%d)", errno);

            return false;

          }

        }

      }

    }

  }

  // partition type info

  ppi->shared_enabled = pspt.type.b.shared_enabled;

  ppi->smt_capable = pspt.type.b.smt_capable;

  ppi->smt_enabled = pspt.type.b.smt_enabled;

  ppi->lpar_capable = pspt.type.b.lpar_capable;

  ppi->lpar_enabled = pspt.type.b.lpar_enabled;

  ppi->dlpar_capable = pspt.type.b.dlpar_capable;

  ppi->capped = pspt.type.b.capped;

  ppi->kernel_is_64 = pspt.type.b.kernel_is_64;

  ppi->pool_util_authority = pspt.type.b.pool_util_authority;

  ppi->donate_capable = pspt.type.b.donate_capable;

  ppi->donate_enabled = pspt.type.b.donate_enabled;

  ppi->ams_capable = pspt.type.b.ams_capable;

  ppi->ams_enabled = pspt.type.b.ams_enabled;

  ppi->power_save = pspt.type.b.power_save;

  ppi->ame_enabled = pspt.type.b.ame_enabled;

  // partition total info

  ppi->online_cpus = pspt.online_cpus;

  ppi->entitled_proc_capacity = pspt.entitled_proc_capacity;

  ppi->var_proc_capacity_weight = pspt.var_proc_capacity_weight;

  ppi->phys_cpus_pool = pspt.phys_cpus_pool;

  ppi->pool_id = pspt.pool_id;

  ppi->entitled_pool_capacity = pspt.entitled_pool_capacity;

  strcpy(ppi->name, pspt.name);

  // Added values to ppi that we need for later computation of cpu utilization

  // ( pool authorization needed for pool_idle_time ??? )

  ppi->timebase_last   = pspt.timebase_last;

  ppi->pool_idle_time  = pspt.pool_idle_time;

  ppi->pcpu_tics_user  = pspt.puser;

  ppi->pcpu_tics_sys   = pspt.psys;

  ppi->pcpu_tics_idle  = pspt.pidle;

  ppi->pcpu_tics_wait  = pspt.pwait;

  // Additional AME information.

  if (ame_details) {

    ppi->true_memory = pspt.true_memory * 4096;

    ppi->expanded_memory = pspt.expanded_memory * 4096;

    ppi->target_memexp_factr = pspt.target_memexp_factr;

    ppi->current_memexp_factr = pspt.current_memexp_factr;

    ppi->cmcs_total_time = pspt.cmcs_total_time;

  }

  return true;

}

// Retrieve wpar information.

bool libperfstat::get_wparinfo(wparinfo_t* pwi) {

  assert(pwi, "get_wparinfo: invalid parameter");

  memset(pwi, 0, sizeof(wparinfo_t));

  if (libperfstat::wpar_getcid() <= 0) {

    return false;

  }

  PERFSTAT_WPAR_TOTAL_T_LATEST pswt;

  memset (&pswt, '\0', sizeof(pswt));

  if (-1 == libperfstat::perfstat_wpar_total(NULL, &pswt, sizeof(PERFSTAT_WPAR_TOTAL_T_LATEST), 1)) {

    if (-1 == libperfstat::perfstat_wpar_total(NULL, &pswt, sizeof(perfstat_wpar_total_t_61), 1)) {

      trcVerbose("perfstat_wpar_total() failed (errno=%d)", errno);

      return false;

    }

  }

  // WPAR type info.

  pwi->app_wpar = pswt.type.b.app_wpar;

  pwi->cpu_rset = pswt.type.b.cpu_rset;

  pwi->cpu_xrset = pswt.type.b.cpu_xrset;

  pwi->cpu_limits = pswt.type.b.cpu_limits;

  pwi->mem_limits = pswt.type.b.mem_limits;

  // WPAR total info.

  strcpy(pwi->name, pswt.name);

  pwi->wpar_id = pswt.wpar_id;

  pwi->cpu_limit = pswt.cpu_limit;

  pwi->mem_limit = pswt.mem_limit;

  return true;

}