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
power_kvm_vm_check_supported(void)19 power_kvm_vm_check_supported(void)
20 {
21 return guest_channel_host_check_exists(FD_PATH);
22 }
23
24 int
power_kvm_vm_init(unsigned int lcore_id)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
power_kvm_vm_exit(unsigned int lcore_id)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
power_kvm_vm_freqs(__rte_unused unsigned int lcore_id,__rte_unused uint32_t * freqs,__rte_unused uint32_t num)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
power_kvm_vm_get_freq(__rte_unused unsigned int lcore_id)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
power_kvm_vm_set_freq(__rte_unused unsigned int lcore_id,__rte_unused uint32_t index)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
send_msg(unsigned int lcore_id,uint32_t scale_direction)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
power_kvm_vm_freq_up(unsigned int lcore_id)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
power_kvm_vm_freq_down(unsigned int lcore_id)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
power_kvm_vm_freq_max(unsigned int lcore_id)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
power_kvm_vm_freq_min(unsigned int lcore_id)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
power_kvm_vm_turbo_status(__rte_unused unsigned int lcore_id)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
power_kvm_vm_enable_turbo(unsigned int lcore_id)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
power_kvm_vm_disable_turbo(unsigned int lcore_id)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;
power_kvm_vm_get_capabilities(__rte_unused unsigned int lcore_id,__rte_unused struct rte_power_core_capabilities * caps)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 }
140