f87a9ddc4a
Function strerror(errno) has built strings only for non-negative errno values.
for negative values of errno it describe error as "Unknown error -errno"
to be more descriptive i put string "channel not found" taken from header.
The negative argument will be interpreted as a very large unsigned value.
Coverity issue: 13266
Coverity issue: 13269
Fixes: 445c6528b5 ("power: common interface for guest and host")
Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <string.h>
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#include <rte_log.h>
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#include "guest_channel.h"
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#include "channel_commands.h"
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#include "rte_power_kvm_vm.h"
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#include "rte_power_common.h"
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#define FD_PATH "/dev/virtio-ports/virtio.serial.port.poweragent"
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static struct channel_packet pkt[CHANNEL_CMDS_MAX_VM_CHANNELS];
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int
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rte_power_kvm_vm_init(unsigned lcore_id)
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{
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if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
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RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
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lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
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return -1;
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}
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pkt[lcore_id].command = CPU_POWER;
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pkt[lcore_id].resource_id = lcore_id;
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return guest_channel_host_connect(FD_PATH, lcore_id);
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}
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int
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rte_power_kvm_vm_exit(unsigned lcore_id)
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{
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guest_channel_host_disconnect(lcore_id);
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return 0;
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}
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uint32_t
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rte_power_kvm_vm_freqs(__attribute__((unused)) unsigned lcore_id,
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__attribute__((unused)) uint32_t *freqs,
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__attribute__((unused)) uint32_t num)
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{
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RTE_LOG(ERR, POWER, "rte_power_freqs is not implemented "
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"for Virtual Machine Power Management\n");
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return -ENOTSUP;
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}
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uint32_t
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rte_power_kvm_vm_get_freq(__attribute__((unused)) unsigned lcore_id)
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{
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RTE_LOG(ERR, POWER, "rte_power_get_freq is not implemented "
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"for Virtual Machine Power Management\n");
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return -ENOTSUP;
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}
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int
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rte_power_kvm_vm_set_freq(__attribute__((unused)) unsigned lcore_id,
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__attribute__((unused)) uint32_t index)
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{
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RTE_LOG(ERR, POWER, "rte_power_set_freq is not implemented "
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"for Virtual Machine Power Management\n");
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return -ENOTSUP;
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}
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static inline int
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send_msg(unsigned lcore_id, uint32_t scale_direction)
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{
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int ret;
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if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
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RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
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lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
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return -1;
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}
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pkt[lcore_id].unit = scale_direction;
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ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
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if (ret == 0)
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return 1;
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RTE_LOG(DEBUG, POWER, "Error sending message: %s\n",
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ret > 0 ? strerror(ret) : "channel not connected");
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return -1;
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}
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int
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rte_power_kvm_vm_freq_up(unsigned lcore_id)
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{
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return send_msg(lcore_id, CPU_POWER_SCALE_UP);
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}
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int
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rte_power_kvm_vm_freq_down(unsigned lcore_id)
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{
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return send_msg(lcore_id, CPU_POWER_SCALE_DOWN);
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}
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int
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rte_power_kvm_vm_freq_max(unsigned lcore_id)
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{
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return send_msg(lcore_id, CPU_POWER_SCALE_MAX);
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}
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int
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rte_power_kvm_vm_freq_min(unsigned lcore_id)
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{
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return send_msg(lcore_id, CPU_POWER_SCALE_MIN);
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}
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