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