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[CHANNEL_CMDS_MAX_VM_CHANNELS];
  17
  18
  19 int
  20 power_kvm_vm_init(unsigned int lcore_id)
  21 {
  22         if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
  23                 RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
  24                                 lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
  25                 return -1;
  26         }
  27         pkt[lcore_id].command = CPU_POWER;
  28         pkt[lcore_id].resource_id = lcore_id;
  29         return guest_channel_host_connect(FD_PATH, lcore_id);
  30 }
  31
  32 int
  33 power_kvm_vm_exit(unsigned int lcore_id)
  34 {
  35         guest_channel_host_disconnect(lcore_id);
  36         return 0;
  37 }
  38
  39 uint32_t
  40 power_kvm_vm_freqs(__attribute__((unused)) unsigned int lcore_id,
  41                 __attribute__((unused)) uint32_t *freqs,
  42                 __attribute__((unused)) uint32_t num)
  43 {
  44         RTE_LOG(ERR, POWER, "rte_power_freqs is not implemented "
  45                         "for Virtual Machine Power Management\n");
  46         return -ENOTSUP;
  47 }
  48
  49 uint32_t
  50 power_kvm_vm_get_freq(__attribute__((unused)) unsigned int lcore_id)
  51 {
  52         RTE_LOG(ERR, POWER, "rte_power_get_freq is not implemented "
  53                         "for Virtual Machine Power Management\n");
  54         return -ENOTSUP;
  55 }
  56
  57 int
  58 power_kvm_vm_set_freq(__attribute__((unused)) unsigned int lcore_id,
  59                 __attribute__((unused)) uint32_t index)
  60 {
  61         RTE_LOG(ERR, POWER, "rte_power_set_freq is not implemented "
  62                         "for Virtual Machine Power Management\n");
  63         return -ENOTSUP;
  64 }
  65
  66 static inline int
  67 send_msg(unsigned int lcore_id, uint32_t scale_direction)
  68 {
  69         int ret;
  70
  71         if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
  72                 RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
  73                                 lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
  74                 return -1;
  75         }
  76         pkt[lcore_id].unit = scale_direction;
  77         ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
  78         if (ret == 0)
  79                 return 1;
  80         RTE_LOG(DEBUG, POWER, "Error sending message: %s\n",
  81                         ret > 0 ? strerror(ret) : "channel not connected");
  82         return -1;
  83 }
  84
  85 int
  86 power_kvm_vm_freq_up(unsigned int lcore_id)
  87 {
  88         return send_msg(lcore_id, CPU_POWER_SCALE_UP);
  89 }
  90
  91 int
  92 power_kvm_vm_freq_down(unsigned int lcore_id)
  93 {
  94         return send_msg(lcore_id, CPU_POWER_SCALE_DOWN);
  95 }
  96
  97 int
  98 power_kvm_vm_freq_max(unsigned int lcore_id)
  99 {
 100         return send_msg(lcore_id, CPU_POWER_SCALE_MAX);
 101 }
 102
 103 int
 104 power_kvm_vm_freq_min(unsigned int lcore_id)
 105 {
 106         return send_msg(lcore_id, CPU_POWER_SCALE_MIN);
 107 }
 108
 109 int
 110 power_kvm_vm_turbo_status(__attribute__((unused)) unsigned int lcore_id)
 111 {
 112         RTE_LOG(ERR, POWER, "rte_power_turbo_status is not implemented for Virtual Machine Power Management\n");
 113         return -ENOTSUP;
 114 }
 115
 116 int
 117 power_kvm_vm_enable_turbo(unsigned int lcore_id)
 118 {
 119         return send_msg(lcore_id, CPU_POWER_ENABLE_TURBO);
 120 }
 121
 122 int
 123 power_kvm_vm_disable_turbo(unsigned int lcore_id)
 124 {
 125         return send_msg(lcore_id, CPU_POWER_DISABLE_TURBO);
 126 }