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-rw-r--r--examples/vm_power_manager/channel_manager.c808
-rw-r--r--examples/vm_power_manager/channel_manager.h314
-rw-r--r--examples/vm_power_manager/channel_monitor.c234
-rw-r--r--examples/vm_power_manager/channel_monitor.h102
4 files changed, 1458 insertions, 0 deletions
diff --git a/examples/vm_power_manager/channel_manager.c b/examples/vm_power_manager/channel_manager.c
new file mode 100644
index 0000000..9968ed9
--- /dev/null
+++ b/examples/vm_power_manager/channel_manager.c
@@ -0,0 +1,808 @@
+/*-
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <sys/queue.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+
+#include <rte_config.h>
+#include <rte_malloc.h>
+#include <rte_memory.h>
+#include <rte_mempool.h>
+#include <rte_log.h>
+#include <rte_atomic.h>
+#include <rte_spinlock.h>
+
+#include <libvirt/libvirt.h>
+
+#include "channel_manager.h"
+#include "channel_commands.h"
+#include "channel_monitor.h"
+
+
+#define RTE_LOGTYPE_CHANNEL_MANAGER RTE_LOGTYPE_USER1
+
+#define ITERATIVE_BITMASK_CHECK_64(mask_u64b, i) \
+ for (i = 0; mask_u64b; mask_u64b &= ~(1ULL << i++)) \
+ if ((mask_u64b >> i) & 1) \
+
+/* Global pointer to libvirt connection */
+static virConnectPtr global_vir_conn_ptr;
+
+static unsigned char *global_cpumaps;
+static virVcpuInfo *global_vircpuinfo;
+static size_t global_maplen;
+
+static unsigned global_n_host_cpus;
+
+/*
+ * Represents a single Virtual Machine
+ */
+struct virtual_machine_info {
+ char name[CHANNEL_MGR_MAX_NAME_LEN];
+ rte_atomic64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS];
+ struct channel_info *channels[CHANNEL_CMDS_MAX_VM_CHANNELS];
+ uint64_t channel_mask;
+ uint8_t num_channels;
+ enum vm_status status;
+ virDomainPtr domainPtr;
+ virDomainInfo info;
+ rte_spinlock_t config_spinlock;
+ LIST_ENTRY(virtual_machine_info) vms_info;
+};
+
+LIST_HEAD(, virtual_machine_info) vm_list_head;
+
+static struct virtual_machine_info *
+find_domain_by_name(const char *name)
+{
+ struct virtual_machine_info *info;
+ LIST_FOREACH(info, &vm_list_head, vms_info) {
+ if (!strncmp(info->name, name, CHANNEL_MGR_MAX_NAME_LEN-1))
+ return info;
+ }
+ return NULL;
+}
+
+static int
+update_pcpus_mask(struct virtual_machine_info *vm_info)
+{
+ virVcpuInfoPtr cpuinfo;
+ unsigned i, j;
+ int n_vcpus;
+ uint64_t mask;
+
+ memset(global_cpumaps, 0, CHANNEL_CMDS_MAX_CPUS*global_maplen);
+
+ if (!virDomainIsActive(vm_info->domainPtr)) {
+ n_vcpus = virDomainGetVcpuPinInfo(vm_info->domainPtr,
+ vm_info->info.nrVirtCpu, global_cpumaps, global_maplen,
+ VIR_DOMAIN_AFFECT_CONFIG);
+ if (n_vcpus < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error getting vCPU info for "
+ "in-active VM '%s'\n", vm_info->name);
+ return -1;
+ }
+ goto update_pcpus;
+ }
+
+ memset(global_vircpuinfo, 0, sizeof(*global_vircpuinfo)*
+ CHANNEL_CMDS_MAX_CPUS);
+
+ cpuinfo = global_vircpuinfo;
+
+ n_vcpus = virDomainGetVcpus(vm_info->domainPtr, cpuinfo,
+ CHANNEL_CMDS_MAX_CPUS, global_cpumaps, global_maplen);
+ if (n_vcpus < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error getting vCPU info for "
+ "active VM '%s'\n", vm_info->name);
+ return -1;
+ }
+update_pcpus:
+ if (n_vcpus >= CHANNEL_CMDS_MAX_CPUS) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Number of vCPUS(%u) is out of range "
+ "0...%d\n", n_vcpus, CHANNEL_CMDS_MAX_CPUS-1);
+ return -1;
+ }
+ if (n_vcpus != vm_info->info.nrVirtCpu) {
+ RTE_LOG(INFO, CHANNEL_MANAGER, "Updating the number of vCPUs for VM '%s"
+ " from %d -> %d\n", vm_info->name, vm_info->info.nrVirtCpu,
+ n_vcpus);
+ vm_info->info.nrVirtCpu = n_vcpus;
+ }
+ for (i = 0; i < vm_info->info.nrVirtCpu; i++) {
+ mask = 0;
+ for (j = 0; j < global_n_host_cpus; j++) {
+ if (VIR_CPU_USABLE(global_cpumaps, global_maplen, i, j) > 0) {
+ mask |= 1ULL << j;
+ }
+ }
+ rte_atomic64_set(&vm_info->pcpu_mask[i], mask);
+ }
+ return 0;
+}
+
+int
+set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask)
+{
+ unsigned i = 0;
+ int flags = VIR_DOMAIN_AFFECT_LIVE|VIR_DOMAIN_AFFECT_CONFIG;
+ struct virtual_machine_info *vm_info;
+ uint64_t mask = core_mask;
+
+ if (vcpu >= CHANNEL_CMDS_MAX_CPUS) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "vCPU(%u) exceeds max allowable(%d)\n",
+ vcpu, CHANNEL_CMDS_MAX_CPUS-1);
+ return -1;
+ }
+
+ vm_info = find_domain_by_name(vm_name);
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "VM '%s' not found\n", vm_name);
+ return -1;
+ }
+
+ if (!virDomainIsActive(vm_info->domainPtr)) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to set vCPU(%u) to pCPU "
+ "mask(0x%"PRIx64") for VM '%s', VM is not active\n",
+ vcpu, core_mask, vm_info->name);
+ return -1;
+ }
+
+ if (vcpu >= vm_info->info.nrVirtCpu) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "vCPU(%u) exceeds the assigned number of "
+ "vCPUs(%u)\n", vcpu, vm_info->info.nrVirtCpu);
+ return -1;
+ }
+ memset(global_cpumaps, 0 , CHANNEL_CMDS_MAX_CPUS * global_maplen);
+ ITERATIVE_BITMASK_CHECK_64(mask, i) {
+ VIR_USE_CPU(global_cpumaps, i);
+ if (i >= global_n_host_cpus) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "CPU(%u) exceeds the available "
+ "number of CPUs(%u)\n", i, global_n_host_cpus);
+ return -1;
+ }
+ }
+ if (virDomainPinVcpuFlags(vm_info->domainPtr, vcpu, global_cpumaps,
+ global_maplen, flags) < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to set vCPU(%u) to pCPU "
+ "mask(0x%"PRIx64") for VM '%s'\n", vcpu, core_mask,
+ vm_info->name);
+ return -1;
+ }
+ rte_atomic64_set(&vm_info->pcpu_mask[vcpu], core_mask);
+ return 0;
+
+}
+
+int
+set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num)
+{
+ uint64_t mask = 1ULL << core_num;
+
+ return set_pcpus_mask(vm_name, vcpu, mask);
+}
+
+uint64_t
+get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu)
+{
+ struct virtual_machine_info *vm_info =
+ (struct virtual_machine_info *)chan_info->priv_info;
+ return rte_atomic64_read(&vm_info->pcpu_mask[vcpu]);
+}
+
+static inline int
+channel_exists(struct virtual_machine_info *vm_info, unsigned channel_num)
+{
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+ if (vm_info->channel_mask & (1ULL << channel_num)) {
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+ return 1;
+ }
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+ return 0;
+}
+
+
+
+static int
+open_non_blocking_channel(struct channel_info *info)
+{
+ int ret, flags;
+ struct sockaddr_un sock_addr;
+ fd_set soc_fd_set;
+ struct timeval tv;
+
+ info->fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (info->fd == -1) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error(%s) creating socket for '%s'\n",
+ strerror(errno),
+ info->channel_path);
+ return -1;
+ }
+ sock_addr.sun_family = AF_UNIX;
+ memcpy(&sock_addr.sun_path, info->channel_path,
+ strlen(info->channel_path)+1);
+
+ /* Get current flags */
+ flags = fcntl(info->fd, F_GETFL, 0);
+ if (flags < 0) {
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "Error(%s) fcntl get flags socket for"
+ "'%s'\n", strerror(errno), info->channel_path);
+ return 1;
+ }
+ /* Set to Non Blocking */
+ flags |= O_NONBLOCK;
+ if (fcntl(info->fd, F_SETFL, flags) < 0) {
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "Error(%s) setting non-blocking "
+ "socket for '%s'\n", strerror(errno), info->channel_path);
+ return -1;
+ }
+ ret = connect(info->fd, (struct sockaddr *)&sock_addr,
+ sizeof(sock_addr));
+ if (ret < 0) {
+ /* ECONNREFUSED error is given when VM is not active */
+ if (errno == ECONNREFUSED) {
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "VM is not active or has not "
+ "activated its endpoint to channel %s\n",
+ info->channel_path);
+ return -1;
+ }
+ /* Wait for tv_sec if in progress */
+ else if (errno == EINPROGRESS) {
+ tv.tv_sec = 2;
+ tv.tv_usec = 0;
+ FD_ZERO(&soc_fd_set);
+ FD_SET(info->fd, &soc_fd_set);
+ if (select(info->fd+1, NULL, &soc_fd_set, NULL, &tv) > 0) {
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "Timeout or error on channel "
+ "'%s'\n", info->channel_path);
+ return -1;
+ }
+ } else {
+ /* Any other error */
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "Error(%s) connecting socket"
+ " for '%s'\n", strerror(errno), info->channel_path);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int
+setup_channel_info(struct virtual_machine_info **vm_info_dptr,
+ struct channel_info **chan_info_dptr, unsigned channel_num)
+{
+ struct channel_info *chan_info = *chan_info_dptr;
+ struct virtual_machine_info *vm_info = *vm_info_dptr;
+
+ chan_info->channel_num = channel_num;
+ chan_info->priv_info = (void *)vm_info;
+ chan_info->status = CHANNEL_MGR_CHANNEL_DISCONNECTED;
+ if (open_non_blocking_channel(chan_info) < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Could not open channel: "
+ "'%s' for VM '%s'\n",
+ chan_info->channel_path, vm_info->name);
+ return -1;
+ }
+ if (add_channel_to_monitor(&chan_info) < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Could add channel: "
+ "'%s' to epoll ctl for VM '%s'\n",
+ chan_info->channel_path, vm_info->name);
+ return -1;
+
+ }
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+ vm_info->num_channels++;
+ vm_info->channel_mask |= 1ULL << channel_num;
+ vm_info->channels[channel_num] = chan_info;
+ chan_info->status = CHANNEL_MGR_CHANNEL_CONNECTED;
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+ return 0;
+}
+
+int
+add_all_channels(const char *vm_name)
+{
+ DIR *d;
+ struct dirent *dir;
+ struct virtual_machine_info *vm_info;
+ struct channel_info *chan_info;
+ char *token, *remaining, *tail_ptr;
+ char socket_name[PATH_MAX];
+ unsigned channel_num;
+ int num_channels_enabled = 0;
+
+ /* verify VM exists */
+ vm_info = find_domain_by_name(vm_name);
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "VM: '%s' not found"
+ " during channel discovery\n", vm_name);
+ return 0;
+ }
+ if (!virDomainIsActive(vm_info->domainPtr)) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "VM: '%s' is not active\n", vm_name);
+ vm_info->status = CHANNEL_MGR_VM_INACTIVE;
+ return 0;
+ }
+ d = opendir(CHANNEL_MGR_SOCKET_PATH);
+ if (d == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error opening directory '%s': %s\n",
+ CHANNEL_MGR_SOCKET_PATH, strerror(errno));
+ return -1;
+ }
+ while ((dir = readdir(d)) != NULL) {
+ if (!strncmp(dir->d_name, ".", 1) ||
+ !strncmp(dir->d_name, "..", 2))
+ continue;
+
+ snprintf(socket_name, sizeof(socket_name), "%s", dir->d_name);
+ remaining = socket_name;
+ /* Extract vm_name from "<vm_name>.<channel_num>" */
+ token = strsep(&remaining, ".");
+ if (remaining == NULL)
+ continue;
+ if (strncmp(vm_name, token, CHANNEL_MGR_MAX_NAME_LEN))
+ continue;
+
+ /* remaining should contain only <channel_num> */
+ errno = 0;
+ channel_num = (unsigned)strtol(remaining, &tail_ptr, 0);
+ if ((errno != 0) || (remaining[0] == '\0') ||
+ (*tail_ptr != '\0') || tail_ptr == NULL) {
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "Malformed channel name"
+ "'%s' found it should be in the form of "
+ "'<guest_name>.<channel_num>(decimal)'\n",
+ dir->d_name);
+ continue;
+ }
+ if (channel_num >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
+ RTE_LOG(WARNING, CHANNEL_MANAGER, "Channel number(%u) is "
+ "greater than max allowable: %d, skipping '%s%s'\n",
+ channel_num, CHANNEL_CMDS_MAX_VM_CHANNELS-1,
+ CHANNEL_MGR_SOCKET_PATH, dir->d_name);
+ continue;
+ }
+ /* if channel has not been added previously */
+ if (channel_exists(vm_info, channel_num))
+ continue;
+
+ chan_info = rte_malloc(NULL, sizeof(*chan_info),
+ CACHE_LINE_SIZE);
+ if (chan_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error allocating memory for "
+ "channel '%s%s'\n", CHANNEL_MGR_SOCKET_PATH, dir->d_name);
+ continue;
+ }
+
+ snprintf(chan_info->channel_path,
+ sizeof(chan_info->channel_path), "%s%s",
+ CHANNEL_MGR_SOCKET_PATH, dir->d_name);
+
+ if (setup_channel_info(&vm_info, &chan_info, channel_num) < 0) {
+ rte_free(chan_info);
+ continue;
+ }
+
+ num_channels_enabled++;
+ }
+ closedir(d);
+ return num_channels_enabled;
+}
+
+int
+add_channels(const char *vm_name, unsigned *channel_list,
+ unsigned len_channel_list)
+{
+ struct virtual_machine_info *vm_info;
+ struct channel_info *chan_info;
+ char socket_path[PATH_MAX];
+ unsigned i;
+ int num_channels_enabled = 0;
+
+ vm_info = find_domain_by_name(vm_name);
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to add channels: VM '%s' "
+ "not found\n", vm_name);
+ return 0;
+ }
+
+ if (!virDomainIsActive(vm_info->domainPtr)) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "VM: '%s' is not active\n", vm_name);
+ vm_info->status = CHANNEL_MGR_VM_INACTIVE;
+ return 0;
+ }
+
+ for (i = 0; i < len_channel_list; i++) {
+
+ if (channel_list[i] >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
+ RTE_LOG(INFO, CHANNEL_MANAGER, "Channel(%u) is out of range "
+ "0...%d\n", channel_list[i],
+ CHANNEL_CMDS_MAX_VM_CHANNELS-1);
+ continue;
+ }
+ if (channel_exists(vm_info, channel_list[i])) {
+ RTE_LOG(INFO, CHANNEL_MANAGER, "Channel already exists, skipping "
+ "'%s.%u'\n", vm_name, i);
+ continue;
+ }
+
+ snprintf(socket_path, sizeof(socket_path), "%s%s.%u",
+ CHANNEL_MGR_SOCKET_PATH, vm_name, channel_list[i]);
+ errno = 0;
+ if (access(socket_path, F_OK) < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Channel path '%s' error: "
+ "%s\n", socket_path, strerror(errno));
+ continue;
+ }
+ chan_info = rte_malloc(NULL, sizeof(*chan_info),
+ CACHE_LINE_SIZE);
+ if (chan_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error allocating memory for "
+ "channel '%s'\n", socket_path);
+ continue;
+ }
+ snprintf(chan_info->channel_path,
+ sizeof(chan_info->channel_path), "%s%s.%u",
+ CHANNEL_MGR_SOCKET_PATH, vm_name, channel_list[i]);
+ if (setup_channel_info(&vm_info, &chan_info, channel_list[i]) < 0) {
+ rte_free(chan_info);
+ continue;
+ }
+ num_channels_enabled++;
+
+ }
+ return num_channels_enabled;
+}
+
+int
+remove_channel(struct channel_info **chan_info_dptr)
+{
+ struct virtual_machine_info *vm_info;
+ struct channel_info *chan_info = *chan_info_dptr;
+
+ close(chan_info->fd);
+
+ vm_info = (struct virtual_machine_info *)chan_info->priv_info;
+
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+ vm_info->channel_mask &= ~(1ULL << chan_info->channel_num);
+ vm_info->num_channels--;
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+
+ rte_free(chan_info);
+ return 0;
+}
+
+int
+set_channel_status_all(const char *vm_name, enum channel_status status)
+{
+ struct virtual_machine_info *vm_info;
+ unsigned i;
+ uint64_t mask;
+ int num_channels_changed = 0;
+
+ if (!(status == CHANNEL_MGR_CHANNEL_CONNECTED ||
+ status == CHANNEL_MGR_CHANNEL_DISABLED)) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Channels can only be enabled or "
+ "disabled: Unable to change status for VM '%s'\n", vm_name);
+ }
+ vm_info = find_domain_by_name(vm_name);
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to disable channels: VM '%s' "
+ "not found\n", vm_name);
+ return 0;
+ }
+
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+ mask = vm_info->channel_mask;
+ ITERATIVE_BITMASK_CHECK_64(mask, i) {
+ vm_info->channels[i]->status = status;
+ num_channels_changed++;
+ }
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+ return num_channels_changed;
+
+}
+
+int
+set_channel_status(const char *vm_name, unsigned *channel_list,
+ unsigned len_channel_list, enum channel_status status)
+{
+ struct virtual_machine_info *vm_info;
+ unsigned i;
+ int num_channels_changed = 0;
+
+ if (!(status == CHANNEL_MGR_CHANNEL_CONNECTED ||
+ status == CHANNEL_MGR_CHANNEL_DISABLED)) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Channels can only be enabled or "
+ "disabled: Unable to change status for VM '%s'\n", vm_name);
+ }
+ vm_info = find_domain_by_name(vm_name);
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to add channels: VM '%s' "
+ "not found\n", vm_name);
+ return 0;
+ }
+ for (i = 0; i < len_channel_list; i++) {
+ if (channel_exists(vm_info, channel_list[i])) {
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+ vm_info->channels[channel_list[i]]->status = status;
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+ num_channels_changed++;
+ }
+ }
+ return num_channels_changed;
+}
+
+int
+get_info_vm(const char *vm_name, struct vm_info *info)
+{
+ struct virtual_machine_info *vm_info;
+ unsigned i, channel_num = 0;
+ uint64_t mask;
+
+ vm_info = find_domain_by_name(vm_name);
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "VM '%s' not found\n", vm_name);
+ return -1;
+ }
+ info->status = CHANNEL_MGR_VM_ACTIVE;
+ if (!virDomainIsActive(vm_info->domainPtr))
+ info->status = CHANNEL_MGR_VM_INACTIVE;
+
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+
+ mask = vm_info->channel_mask;
+ ITERATIVE_BITMASK_CHECK_64(mask, i) {
+ info->channels[channel_num].channel_num = i;
+ memcpy(info->channels[channel_num].channel_path,
+ vm_info->channels[i]->channel_path, PATH_MAX);
+ info->channels[channel_num].status = vm_info->channels[i]->status;
+ info->channels[channel_num].fd = vm_info->channels[i]->fd;
+ channel_num++;
+ }
+
+ info->num_channels = channel_num;
+ info->num_vcpus = vm_info->info.nrVirtCpu;
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+
+ memcpy(info->name, vm_info->name, sizeof(vm_info->name));
+ for (i = 0; i < info->num_vcpus; i++) {
+ info->pcpu_mask[i] = rte_atomic64_read(&vm_info->pcpu_mask[i]);
+ }
+ return 0;
+}
+
+int
+add_vm(const char *vm_name)
+{
+ struct virtual_machine_info *new_domain;
+ virDomainPtr dom_ptr;
+ int i;
+
+ if (find_domain_by_name(vm_name) != NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to add VM: VM '%s' "
+ "already exists\n", vm_name);
+ return -1;
+ }
+
+ if (global_vir_conn_ptr == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "No connection to hypervisor exists\n");
+ return -1;
+ }
+ dom_ptr = virDomainLookupByName(global_vir_conn_ptr, vm_name);
+ if (dom_ptr == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error on VM lookup with libvirt: "
+ "VM '%s' not found\n", vm_name);
+ return -1;
+ }
+
+ new_domain = rte_malloc("virtual_machine_info", sizeof(*new_domain),
+ CACHE_LINE_SIZE);
+ if (new_domain == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to allocate memory for VM "
+ "info\n");
+ return -1;
+ }
+ new_domain->domainPtr = dom_ptr;
+ if (virDomainGetInfo(new_domain->domainPtr, &new_domain->info) != 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to get libvirt VM info\n");
+ rte_free(new_domain);
+ return -1;
+ }
+ if (new_domain->info.nrVirtCpu > CHANNEL_CMDS_MAX_CPUS) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error the number of virtual CPUs(%u) is "
+ "greater than allowable(%d)\n", new_domain->info.nrVirtCpu,
+ CHANNEL_CMDS_MAX_CPUS);
+ rte_free(new_domain);
+ return -1;
+ }
+
+ for (i = 0; i < CHANNEL_CMDS_MAX_CPUS; i++) {
+ rte_atomic64_init(&new_domain->pcpu_mask[i]);
+ }
+ if (update_pcpus_mask(new_domain) < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error getting physical CPU pinning\n");
+ rte_free(new_domain);
+ return -1;
+ }
+ strncpy(new_domain->name, vm_name, sizeof(new_domain->name));
+ new_domain->channel_mask = 0;
+ new_domain->num_channels = 0;
+
+ if (!virDomainIsActive(dom_ptr))
+ new_domain->status = CHANNEL_MGR_VM_INACTIVE;
+ else
+ new_domain->status = CHANNEL_MGR_VM_ACTIVE;
+
+ rte_spinlock_init(&(new_domain->config_spinlock));
+ LIST_INSERT_HEAD(&vm_list_head, new_domain, vms_info);
+ return 0;
+}
+
+int
+remove_vm(const char *vm_name)
+{
+ struct virtual_machine_info *vm_info = find_domain_by_name(vm_name);
+
+ if (vm_info == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to remove VM: VM '%s' "
+ "not found\n", vm_name);
+ return -1;
+ }
+ rte_spinlock_lock(&vm_info->config_spinlock);
+ if (vm_info->num_channels != 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to remove VM '%s', there are "
+ "%"PRId8" channels still active\n",
+ vm_name, vm_info->num_channels);
+ rte_spinlock_unlock(&vm_info->config_spinlock);
+ return -1;
+ }
+ LIST_REMOVE(vm_info, vms_info);
+ rte_spinlock_unlock(&vm_info->config_spinlock);
+ rte_free(vm_info);
+ return 0;
+}
+
+static void
+disconnect_hypervisor(void)
+{
+ if (global_vir_conn_ptr != NULL) {
+ virConnectClose(global_vir_conn_ptr);
+ global_vir_conn_ptr = NULL;
+ }
+}
+
+static int
+connect_hypervisor(const char *path)
+{
+ if (global_vir_conn_ptr != NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error connecting to %s, connection "
+ "already established\n", path);
+ return -1;
+ }
+ global_vir_conn_ptr = virConnectOpen(path);
+ if (global_vir_conn_ptr == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error failed to open connection to "
+ "Hypervisor '%s'\n", path);
+ return -1;
+ }
+ return 0;
+}
+
+int
+channel_manager_init(const char *path)
+{
+ int n_cpus;
+
+ LIST_INIT(&vm_list_head);
+ if (connect_hypervisor(path) < 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to initialize channel manager\n");
+ return -1;
+ }
+
+ global_maplen = VIR_CPU_MAPLEN(CHANNEL_CMDS_MAX_CPUS);
+
+ global_vircpuinfo = rte_zmalloc(NULL, sizeof(*global_vircpuinfo) *
+ CHANNEL_CMDS_MAX_CPUS, CACHE_LINE_SIZE);
+ if (global_vircpuinfo == NULL) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Error allocating memory for CPU Info\n");
+ goto error;
+ }
+ global_cpumaps = rte_zmalloc(NULL, CHANNEL_CMDS_MAX_CPUS * global_maplen,
+ CACHE_LINE_SIZE);
+ if (global_cpumaps == NULL) {
+ goto error;
+ }
+
+ n_cpus = virNodeGetCPUMap(global_vir_conn_ptr, NULL, NULL, 0);
+ if (n_cpus <= 0) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to get the number of Host "
+ "CPUs\n");
+ goto error;
+ }
+ global_n_host_cpus = (unsigned)n_cpus;
+
+ if (global_n_host_cpus > CHANNEL_CMDS_MAX_CPUS) {
+ RTE_LOG(ERR, CHANNEL_MANAGER, "The number of host CPUs(%u) exceeds the "
+ "maximum of %u\n", global_n_host_cpus, CHANNEL_CMDS_MAX_CPUS);
+ goto error;
+
+ }
+
+ return 0;
+error:
+ disconnect_hypervisor();
+ return -1;
+}
+
+void
+channel_manager_exit(void)
+{
+ unsigned i;
+ uint64_t mask;
+ struct virtual_machine_info *vm_info;
+
+ LIST_FOREACH(vm_info, &vm_list_head, vms_info) {
+
+ rte_spinlock_lock(&(vm_info->config_spinlock));
+
+ mask = vm_info->channel_mask;
+ ITERATIVE_BITMASK_CHECK_64(mask, i) {
+ remove_channel_from_monitor(vm_info->channels[i]);
+ close(vm_info->channels[i]->fd);
+ rte_free(vm_info->channels[i]);
+ }
+ rte_spinlock_unlock(&(vm_info->config_spinlock));
+
+ LIST_REMOVE(vm_info, vms_info);
+ rte_free(vm_info);
+ }
+
+ if (global_cpumaps != NULL)
+ rte_free(global_cpumaps);
+ if (global_vircpuinfo != NULL)
+ rte_free(global_vircpuinfo);
+ disconnect_hypervisor();
+}
diff --git a/examples/vm_power_manager/channel_manager.h b/examples/vm_power_manager/channel_manager.h
new file mode 100644
index 0000000..12c29c3
--- /dev/null
+++ b/examples/vm_power_manager/channel_manager.h
@@ -0,0 +1,314 @@
+/*-
+ * 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.
+ */
+
+#ifndef CHANNEL_MANAGER_H_
+#define CHANNEL_MANAGER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <linux/limits.h>
+#include <rte_atomic.h>
+#include "channel_commands.h"
+
+/* Maximum name length including '\0' terminator */
+#define CHANNEL_MGR_MAX_NAME_LEN 64
+
+/* Maximum number of channels to each Virtual Machine */
+#define CHANNEL_MGR_MAX_CHANNELS 64
+
+/* Hypervisor Path for libvirt(qemu/KVM) */
+#define CHANNEL_MGR_DEFAULT_HV_PATH "qemu:///system"
+
+/* File socket directory */
+#define CHANNEL_MGR_SOCKET_PATH "/tmp/powermonitor/"
+
+/* Communication Channel Status */
+enum channel_status { CHANNEL_MGR_CHANNEL_DISCONNECTED = 0,
+ CHANNEL_MGR_CHANNEL_CONNECTED,
+ CHANNEL_MGR_CHANNEL_DISABLED,
+ CHANNEL_MGR_CHANNEL_PROCESSING};
+
+/* VM libvirt(qemu/KVM) connection status */
+enum vm_status { CHANNEL_MGR_VM_INACTIVE = 0, CHANNEL_MGR_VM_ACTIVE};
+
+/*
+ * Represents a single and exclusive VM channel that exists between a guest and
+ * the host.
+ */
+struct channel_info {
+ char channel_path[PATH_MAX]; /**< Path to host socket */
+ volatile uint32_t status; /**< Connection status(enum channel_status) */
+ int fd; /**< AF_UNIX socket fd */
+ unsigned channel_num; /**< CHANNEL_MGR_SOCKET_PATH/<vm_name>.channel_num */
+ void *priv_info; /**< Pointer to private info, do not modify */
+};
+
+/* Represents a single VM instance used to return internal information about
+ * a VM */
+struct vm_info {
+ char name[CHANNEL_MGR_MAX_NAME_LEN]; /**< VM name */
+ enum vm_status status; /**< libvirt status */
+ uint64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS]; /**< pCPU mask for each vCPU */
+ unsigned num_vcpus; /**< number of vCPUS */
+ struct channel_info channels[CHANNEL_MGR_MAX_CHANNELS]; /**< Array of channel_info */
+ unsigned num_channels; /**< Number of channels */
+};
+
+/**
+ * Initialize the Channel Manager resources and connect to the Hypervisor
+ * specified in path.
+ * This must be successfully called first before calling any other functions.
+ * It must only be call once;
+ *
+ * @param path
+ * Must be a local path, e.g. qemu:///system.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int channel_manager_init(const char *path);
+
+/**
+ * Free resources associated with the Channel Manager.
+ *
+ * @param path
+ * Must be a local path, e.g. qemu:///system.
+ *
+ * @return
+ * None
+ */
+void channel_manager_exit(void);
+
+/**
+ * Get the Physical CPU mask for VM lcore channel(vcpu), result is assigned to
+ * core_mask.
+ * It is not thread-safe.
+ *
+ * @param chan_info
+ * Pointer to struct channel_info
+ *
+ * @param vcpu
+ * The virtual CPU to query.
+ *
+ *
+ * @return
+ * - 0 on error.
+ * - >0 on success.
+ */
+uint64_t get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu);
+
+/**
+ * Set the Physical CPU mask for the specified vCPU.
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to lookup
+ *
+ * @param vcpu
+ * The virtual CPU to set.
+ *
+ * @param core_mask
+ * The core mask of the physical CPU(s) to bind the vCPU
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask);
+
+/**
+ * Set the Physical CPU for the specified vCPU.
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to lookup
+ *
+ * @param vcpu
+ * The virtual CPU to set.
+ *
+ * @param core_num
+ * The core number of the physical CPU(s) to bind the vCPU
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num);
+/**
+ * Add a VM as specified by name to the Channel Manager. The name must
+ * correspond to a valid libvirt domain name.
+ * This is required prior to adding channels.
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to lookup.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int add_vm(const char *name);
+
+/**
+ * Remove a previously added Virtual Machine from the Channel Manager
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to lookup.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int remove_vm(const char *name);
+
+/**
+ * Add all available channels to the VM as specified by name.
+ * Channels in the form of paths
+ * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to lookup.
+ *
+ * @return
+ * - N the number of channels added for the VM
+ */
+int add_all_channels(const char *vm_name);
+
+/**
+ * Add the channel numbers in channel_list to the domain specified by name.
+ * Channels in the form of paths
+ * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to add channels.
+ *
+ * @param channel_list
+ * Pointer to list of unsigned integers, representing the channel number to add
+ * It must be allocated outside of this function.
+ *
+ * @param num_channels
+ * The amount of channel numbers in channel_list
+ *
+ * @return
+ * - N the number of channels added for the VM
+ * - 0 for error
+ */
+int add_channels(const char *vm_name, unsigned *channel_list,
+ unsigned num_channels);
+
+/**
+ * Remove a channel definition from the channel manager. This must only be
+ * called from the channel monitor thread.
+ *
+ * @param chan_info
+ * Pointer to a valid struct channel_info.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int remove_channel(struct channel_info **chan_info_dptr);
+
+/**
+ * For all channels associated with a Virtual Machine name, update the
+ * connection status. Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
+ * CHANNEL_MGR_CHANNEL_DISABLED only.
+ *
+ *
+ * @param name
+ * Virtual Machine name to modify all channels.
+ *
+ * @param status
+ * The status to set each channel
+ *
+ * @param num_channels
+ * The amount of channel numbers in channel_list
+ *
+ * @return
+ * - N the number of channels added for the VM
+ * - 0 for error
+ */
+int set_channel_status_all(const char *name, enum channel_status status);
+
+/**
+ * For all channels in channel_list associated with a Virtual Machine name
+ * update the connection status of each.
+ * Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
+ * CHANNEL_MGR_CHANNEL_DISABLED only.
+ * It is not thread-safe.
+ *
+ * @param name
+ * Virtual Machine name to add channels.
+ *
+ * @param channel_list
+ * Pointer to list of unsigned integers, representing the channel numbers to
+ * modify.
+ * It must be allocated outside of this function.
+ *
+ * @param num_channels
+ * The amount of channel numbers in channel_list
+ *
+ * @return
+ * - N the number of channels modified for the VM
+ * - 0 for error
+ */
+int set_channel_status(const char *vm_name, unsigned *channel_list,
+ unsigned len_channel_list, enum channel_status status);
+
+/**
+ * Populates a pointer to struct vm_info associated with vm_name.
+ *
+ * @param vm_name
+ * The name of the virtual machine to lookup.
+ *
+ * @param vm_info
+ * Pointer to a struct vm_info, this must be allocated prior to calling this
+ * function.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int get_info_vm(const char *vm_name, struct vm_info *info);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CHANNEL_MANAGER_H_ */
diff --git a/examples/vm_power_manager/channel_monitor.c b/examples/vm_power_manager/channel_monitor.c
new file mode 100644
index 0000000..08b4137
--- /dev/null
+++ b/examples/vm_power_manager/channel_monitor.c
@@ -0,0 +1,234 @@
+/*-
+ * 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_config.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, 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);
+ }
+ }
+ }
+}
diff --git a/examples/vm_power_manager/channel_monitor.h b/examples/vm_power_manager/channel_monitor.h
new file mode 100644
index 0000000..c138607
--- /dev/null
+++ b/examples/vm_power_manager/channel_monitor.h
@@ -0,0 +1,102 @@
+/*-
+ * 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.
+ */
+
+#ifndef CHANNEL_MONITOR_H_
+#define CHANNEL_MONITOR_H_
+
+#include "channel_manager.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Setup the Channel Monitor resources required to initialize epoll.
+ * Must be called first before calling other functions.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int channel_monitor_init(void);
+
+/**
+ * Run the channel monitor, loops forever on on epoll_wait.
+ *
+ *
+ * @return
+ * None
+ */
+void run_channel_monitor(void);
+
+/**
+ * Exit the Channel Monitor, exiting the epoll_wait loop and events processing.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+void channel_monitor_exit(void);
+
+/**
+ * Add an open channel to monitor via epoll. A pointer to struct channel_info
+ * will be registered with epoll for event processing.
+ * It is thread-safe.
+ *
+ * @param chan_info
+ * Pointer to struct channel_info pointer.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int add_channel_to_monitor(struct channel_info **chan_info);
+
+/**
+ * Remove a previously added channel from epoll control.
+ *
+ * @param chan_info
+ * Pointer to struct channel_info.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int remove_channel_from_monitor(struct channel_info *chan_info);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* CHANNEL_MONITOR_H_ */