lib/librte_power/power_kvm_vm.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4 #include <errno.h>
   5 #include <string.h>
   6
   7 #include <rte_log.h>
   8
   9 #include "guest_channel.h"
  10 #include "channel_commands.h"
  11 #include "power_kvm_vm.h"
  12 #include "power_common.h"
  13
  14 #define FD_PATH "/dev/virtio-ports/virtio.serial.port.poweragent"
  15
  16 static struct channel_packet pkt[RTE_MAX_LCORE];
  17
  18 int
  19 power_kvm_vm_check_supported(void)
  20 {
  21         return guest_channel_host_check_exists(FD_PATH);
  22 }
  23
  24 int
  25 power_kvm_vm_init(unsigned int lcore_id)
  26 {
  27         if (lcore_id >= RTE_MAX_LCORE) {
  28                 RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
  29                                 lcore_id, RTE_MAX_LCORE-1);
  30                 return -1;
  31         }
  32         pkt[lcore_id].command = CPU_POWER;
  33         pkt[lcore_id].resource_id = lcore_id;
  34         return guest_channel_host_connect(FD_PATH, lcore_id);
  35 }
  36
  37 int
  38 power_kvm_vm_exit(unsigned int lcore_id)
  39 {
  40         guest_channel_host_disconnect(lcore_id);
  41         return 0;
  42 }
  43
  44 uint32_t
  45 power_kvm_vm_freqs(__rte_unused unsigned int lcore_id,
  46                 __rte_unused uint32_t *freqs,
  47                 __rte_unused uint32_t num)
  48 {
  49         RTE_LOG(ERR, POWER, "rte_power_freqs is not implemented "
  50                         "for Virtual Machine Power Management\n");
  51         return -ENOTSUP;
  52 }
  53
  54 uint32_t
  55 power_kvm_vm_get_freq(__rte_unused unsigned int lcore_id)
  56 {
  57         RTE_LOG(ERR, POWER, "rte_power_get_freq is not implemented "
  58                         "for Virtual Machine Power Management\n");
  59         return -ENOTSUP;
  60 }
  61
  62 int
  63 power_kvm_vm_set_freq(__rte_unused unsigned int lcore_id,
  64                 __rte_unused uint32_t index)
  65 {
  66         RTE_LOG(ERR, POWER, "rte_power_set_freq is not implemented "
  67                         "for Virtual Machine Power Management\n");
  68         return -ENOTSUP;
  69 }
  70
  71 static inline int
  72 send_msg(unsigned int lcore_id, uint32_t scale_direction)
  73 {
  74         int ret;
  75
  76         if (lcore_id >= RTE_MAX_LCORE) {
  77                 RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
  78                                 lcore_id, RTE_MAX_LCORE-1);
  79                 return -1;
  80         }
  81         pkt[lcore_id].unit = scale_direction;
  82         ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
  83         if (ret == 0)
  84                 return 1;
  85         RTE_LOG(DEBUG, POWER, "Error sending message: %s\n",
  86                         ret > 0 ? strerror(ret) : "channel not connected");
  87         return -1;
  88 }
  89
  90 int
  91 power_kvm_vm_freq_up(unsigned int lcore_id)
  92 {
  93         return send_msg(lcore_id, CPU_POWER_SCALE_UP);
  94 }
  95
  96 int
  97 power_kvm_vm_freq_down(unsigned int lcore_id)
  98 {
  99         return send_msg(lcore_id, CPU_POWER_SCALE_DOWN);
 100 }
 101
 102 int
 103 power_kvm_vm_freq_max(unsigned int lcore_id)
 104 {
 105         return send_msg(lcore_id, CPU_POWER_SCALE_MAX);
 106 }
 107
 108 int
 109 power_kvm_vm_freq_min(unsigned int lcore_id)
 110 {
 111         return send_msg(lcore_id, CPU_POWER_SCALE_MIN);
 112 }
 113
 114 int
 115 power_kvm_vm_turbo_status(__rte_unused unsigned int lcore_id)
 116 {
 117         RTE_LOG(ERR, POWER, "rte_power_turbo_status is not implemented for Virtual Machine Power Management\n");
 118         return -ENOTSUP;
 119 }
 120
 121 int
 122 power_kvm_vm_enable_turbo(unsigned int lcore_id)
 123 {
 124         return send_msg(lcore_id, CPU_POWER_ENABLE_TURBO);
 125 }
 126
 127 int
 128 power_kvm_vm_disable_turbo(unsigned int lcore_id)
 129 {
 130         return send_msg(lcore_id, CPU_POWER_DISABLE_TURBO);
 131 }
 132
 133 struct rte_power_core_capabilities;
 134 int power_kvm_vm_get_capabilities(__rte_unused unsigned int lcore_id,
 135                 __rte_unused struct rte_power_core_capabilities *caps)
 136 {
 137         RTE_LOG(ERR, POWER, "rte_power_get_capabilities is not implemented for Virtual Machine Power Management\n");
 138         return -ENOTSUP;
 139 }