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
power_kvm_vm_check_supported(void)18 power_kvm_vm_check_supported(void)
19 {
20 return guest_channel_host_check_exists(FD_PATH);
21 }
22
23 int
power_kvm_vm_init(unsigned int lcore_id)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
power_kvm_vm_exit(unsigned int lcore_id)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
power_kvm_vm_freqs(__rte_unused unsigned int lcore_id,__rte_unused uint32_t * freqs,__rte_unused uint32_t num)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
power_kvm_vm_get_freq(__rte_unused unsigned int lcore_id)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
power_kvm_vm_set_freq(__rte_unused unsigned int lcore_id,__rte_unused uint32_t index)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
send_msg(unsigned int lcore_id,uint32_t scale_direction)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
power_kvm_vm_freq_up(unsigned int lcore_id)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
power_kvm_vm_freq_down(unsigned int lcore_id)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
power_kvm_vm_freq_max(unsigned int lcore_id)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
power_kvm_vm_freq_min(unsigned int lcore_id)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
power_kvm_vm_turbo_status(__rte_unused unsigned int lcore_id)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
power_kvm_vm_enable_turbo(unsigned int lcore_id)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
power_kvm_vm_disable_turbo(unsigned int lcore_id)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;
power_kvm_vm_get_capabilities(__rte_unused unsigned int lcore_id,__rte_unused struct rte_power_core_capabilities * caps)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 }
139