DPDK  16.04.0
vm_power_manager/channel_monitor.c
/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/epoll.h>
#include <sys/queue.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_malloc.h>
#include <rte_atomic.h>
#include "channel_monitor.h"
#include "channel_commands.h"
#include "channel_manager.h"
#include "power_manager.h"
#define RTE_LOGTYPE_CHANNEL_MONITOR RTE_LOGTYPE_USER1
#define MAX_EVENTS 256
static volatile unsigned run_loop = 1;
static int global_event_fd;
static struct epoll_event *global_events_list;
void channel_monitor_exit(void)
{
run_loop = 0;
rte_free(global_events_list);
}
static int
process_request(struct channel_packet *pkt, struct channel_info *chan_info)
{
uint64_t core_mask;
if (chan_info == NULL)
return -1;
if (rte_atomic32_cmpset(&(chan_info->status), CHANNEL_MGR_CHANNEL_CONNECTED,
CHANNEL_MGR_CHANNEL_PROCESSING) == 0)
return -1;
if (pkt->command == CPU_POWER) {
core_mask = get_pcpus_mask(chan_info, pkt->resource_id);
if (core_mask == 0) {
RTE_LOG(ERR, CHANNEL_MONITOR, "Error get physical CPU mask for "
"channel '%s' using vCPU(%u)\n", chan_info->channel_path,
(unsigned)pkt->unit);
return -1;
}
if (__builtin_popcountll(core_mask) == 1) {
unsigned core_num = __builtin_ffsll(core_mask) - 1;
switch (pkt->unit) {
case(CPU_POWER_SCALE_MIN):
power_manager_scale_core_min(core_num);
break;
case(CPU_POWER_SCALE_MAX):
power_manager_scale_core_max(core_num);
break;
case(CPU_POWER_SCALE_DOWN):
power_manager_scale_core_down(core_num);
break;
case(CPU_POWER_SCALE_UP):
power_manager_scale_core_up(core_num);
break;
default:
break;
}
} else {
switch (pkt->unit) {
case(CPU_POWER_SCALE_MIN):
power_manager_scale_mask_min(core_mask);
break;
case(CPU_POWER_SCALE_MAX):
power_manager_scale_mask_max(core_mask);
break;
case(CPU_POWER_SCALE_DOWN):
power_manager_scale_mask_down(core_mask);
break;
case(CPU_POWER_SCALE_UP):
power_manager_scale_mask_up(core_mask);
break;
default:
break;
}
}
}
/* Return is not checked as channel status may have been set to DISABLED
* from management thread
*/
rte_atomic32_cmpset(&(chan_info->status), CHANNEL_MGR_CHANNEL_PROCESSING,
CHANNEL_MGR_CHANNEL_CONNECTED);
return 0;
}
int
add_channel_to_monitor(struct channel_info **chan_info)
{
struct channel_info *info = *chan_info;
struct epoll_event event;
event.events = EPOLLIN;
event.data.ptr = info;
if (epoll_ctl(global_event_fd, EPOLL_CTL_ADD, info->fd, &event) < 0) {
RTE_LOG(ERR, CHANNEL_MONITOR, "Unable to add channel '%s' "
"to epoll\n", info->channel_path);
return -1;
}
return 0;
}
int
remove_channel_from_monitor(struct channel_info *chan_info)
{
if (epoll_ctl(global_event_fd, EPOLL_CTL_DEL, chan_info->fd, NULL) < 0) {
RTE_LOG(ERR, CHANNEL_MONITOR, "Unable to remove channel '%s' "
"from epoll\n", chan_info->channel_path);
return -1;
}
return 0;
}
int
channel_monitor_init(void)
{
global_event_fd = epoll_create1(0);
if (global_event_fd == 0) {
RTE_LOG(ERR, CHANNEL_MONITOR, "Error creating epoll context with "
"error %s\n", strerror(errno));
return -1;
}
global_events_list = rte_malloc("epoll_events", sizeof(*global_events_list)
* MAX_EVENTS, RTE_CACHE_LINE_SIZE);
if (global_events_list == NULL) {
RTE_LOG(ERR, CHANNEL_MONITOR, "Unable to rte_malloc for "
"epoll events\n");
return -1;
}
return 0;
}
void
run_channel_monitor(void)
{
while (run_loop) {
int n_events, i;
n_events = epoll_wait(global_event_fd, global_events_list,
MAX_EVENTS, 1);
if (!run_loop)
break;
for (i = 0; i < n_events; i++) {
struct channel_info *chan_info = (struct channel_info *)
global_events_list[i].data.ptr;
if ((global_events_list[i].events & EPOLLERR) ||
(global_events_list[i].events & EPOLLHUP)) {
RTE_LOG(DEBUG, CHANNEL_MONITOR, "Remote closed connection for "
"channel '%s'\n", chan_info->channel_path);
remove_channel(&chan_info);
continue;
}
if (global_events_list[i].events & EPOLLIN) {
int n_bytes, err = 0;
struct channel_packet pkt;
void *buffer = &pkt;
int buffer_len = sizeof(pkt);
while (buffer_len > 0) {
n_bytes = read(chan_info->fd, buffer, buffer_len);
if (n_bytes == buffer_len)
break;
if (n_bytes == -1) {
err = errno;
RTE_LOG(DEBUG, CHANNEL_MONITOR, "Received error on "
"channel '%s' read: %s\n",
chan_info->channel_path, strerror(err));
remove_channel(&chan_info);
break;
}
buffer = (char *)buffer + n_bytes;
buffer_len -= n_bytes;
}
if (!err)
process_request(&pkt, chan_info);
}
}
}
}
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