lib/librte_power/rte_power_kvm_vm.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 #include <errno.h>
  34 #include <string.h>
  35
  36 #include <rte_log.h>
  37 #include <rte_config.h>
  38
  39 #include "guest_channel.h"
  40 #include "channel_commands.h"
  41 #include "rte_power_kvm_vm.h"
  42 #include "rte_power_common.h"
  43
  44 #define FD_PATH "/dev/virtio-ports/virtio.serial.port.poweragent"
  45
  46 static struct channel_packet pkt[CHANNEL_CMDS_MAX_VM_CHANNELS];
  47
  48
  49 int
  50 rte_power_kvm_vm_init(unsigned lcore_id)
  51 {
  52         if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
  53                 RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
  54                                 lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
  55                 return -1;
  56         }
  57         pkt[lcore_id].command = CPU_POWER;
  58         pkt[lcore_id].resource_id = lcore_id;
  59         return guest_channel_host_connect(FD_PATH, lcore_id);
  60 }
  61
  62 int
  63 rte_power_kvm_vm_exit(unsigned lcore_id)
  64 {
  65         guest_channel_host_disconnect(lcore_id);
  66         return 0;
  67 }
  68
  69 uint32_t
  70 rte_power_kvm_vm_freqs(__attribute__((unused)) unsigned lcore_id,
  71                 __attribute__((unused)) uint32_t *freqs,
  72                 __attribute__((unused)) uint32_t num)
  73 {
  74         RTE_LOG(ERR, POWER, "rte_power_freqs is not implemented "
  75                         "for Virtual Machine Power Management\n");
  76         return -ENOTSUP;
  77 }
  78
  79 uint32_t
  80 rte_power_kvm_vm_get_freq(__attribute__((unused)) unsigned lcore_id)
  81 {
  82         RTE_LOG(ERR, POWER, "rte_power_get_freq is not implemented "
  83                         "for Virtual Machine Power Management\n");
  84         return -ENOTSUP;
  85 }
  86
  87 int
  88 rte_power_kvm_vm_set_freq(__attribute__((unused)) unsigned lcore_id,
  89                 __attribute__((unused)) uint32_t index)
  90 {
  91         RTE_LOG(ERR, POWER, "rte_power_set_freq is not implemented "
  92                         "for Virtual Machine Power Management\n");
  93         return -ENOTSUP;
  94 }
  95
  96 static inline int
  97 send_msg(unsigned lcore_id, uint32_t scale_direction)
  98 {
  99         int ret;
 100
 101         if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
 102                 RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
 103                                 lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
 104                 return -1;
 105         }
 106         pkt[lcore_id].unit = scale_direction;
 107         ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
 108         if (ret == 0)
 109                 return 1;
 110         RTE_LOG(DEBUG, POWER, "Error sending message: %s\n", strerror(ret));
 111         return -1;
 112 }
 113
 114 int
 115 rte_power_kvm_vm_freq_up(unsigned lcore_id)
 116 {
 117         return send_msg(lcore_id, CPU_POWER_SCALE_UP);
 118 }
 119
 120 int
 121 rte_power_kvm_vm_freq_down(unsigned lcore_id)
 122 {
 123         return send_msg(lcore_id, CPU_POWER_SCALE_DOWN);
 124 }
 125
 126 int
 127 rte_power_kvm_vm_freq_max(unsigned lcore_id)
 128 {
 129         return send_msg(lcore_id, CPU_POWER_SCALE_MAX);
 130 }
 131
 132 int
 133 rte_power_kvm_vm_freq_min(unsigned lcore_id)
 134 {
 135         return send_msg(lcore_id, CPU_POWER_SCALE_MIN);
 136 }