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authorAlan Carew <alan.carew@intel.com>2014-11-25 16:18:08 +0000
committerThomas Monjalon <thomas.monjalon@6wind.com>2014-11-26 17:27:04 +0100
commit445c6528b55f9025bbeeb5eeabaed14c74125696 (patch)
tree3f04ab31f148d27b591f4717e290f158167bb53e
parentcd0d5547e873c06386231d6fdae381d5c4f9f9bd (diff)
downloaddpdk-next-net-intel-445c6528b55f.zip
dpdk-next-net-intel-445c6528b55f.tar.gz
dpdk-next-net-intel-445c6528b55f.tar.xz
power: common interface for guest and host
Moved the current librte_power implementation to rte_power_acpi_cpufreq, with renaming of functions only. Added rte_power_kvm_vm implementation to support Power Management from a VM. librte_power now hides the implementation based on the environment used. A new call rte_power_set_env() can explicidly set the environment, if not called then auto-detection takes place. rte_power_kvm_vm is subset of the librte_power APIs, the following is supported: rte_power_init(unsigned lcore_id) rte_power_exit(unsigned lcore_id) rte_power_freq_up(unsigned lcore_id) rte_power_freq_down(unsigned lcore_id) rte_power_freq_min(unsigned lcore_id) rte_power_freq_max(unsigned lcore_id) The other unsupported APIs return -ENOTSUP Signed-off-by: Alan Carew <alan.carew@intel.com> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
-rw-r--r--lib/librte_power/rte_power.c540
-rw-r--r--lib/librte_power/rte_power.h120
-rw-r--r--lib/librte_power/rte_power_acpi_cpufreq.c545
-rw-r--r--lib/librte_power/rte_power_acpi_cpufreq.h192
-rw-r--r--lib/librte_power/rte_power_common.h39
-rw-r--r--lib/librte_power/rte_power_kvm_vm.c136
-rw-r--r--lib/librte_power/rte_power_kvm_vm.h179
7 files changed, 1249 insertions, 502 deletions
diff --git a/lib/librte_power/rte_power.c b/lib/librte_power/rte_power.c
index 856da9a..998ed1c 100644
--- a/lib/librte_power/rte_power.c
+++ b/lib/librte_power/rte_power.c
@@ -31,515 +31,113 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <signal.h>
-#include <limits.h>
-
-#include <rte_memcpy.h>
#include <rte_atomic.h>
#include "rte_power.h"
+#include "rte_power_acpi_cpufreq.h"
+#include "rte_power_kvm_vm.h"
+#include "rte_power_common.h"
-#ifdef RTE_LIBRTE_POWER_DEBUG
-#define POWER_DEBUG_TRACE(fmt, args...) do { \
- RTE_LOG(ERR, POWER, "%s: " fmt, __func__, ## args); \
- } while (0)
-#else
-#define POWER_DEBUG_TRACE(fmt, args...)
-#endif
-
-#define FOPEN_OR_ERR_RET(f, retval) do { \
- if ((f) == NULL) { \
- RTE_LOG(ERR, POWER, "File not openned\n"); \
- return (retval); \
- } \
-} while(0)
-
-#define FOPS_OR_NULL_GOTO(ret, label) do { \
- if ((ret) == NULL) { \
- RTE_LOG(ERR, POWER, "fgets returns nothing\n"); \
- goto label; \
- } \
-} while(0)
-
-#define FOPS_OR_ERR_GOTO(ret, label) do { \
- if ((ret) < 0) { \
- RTE_LOG(ERR, POWER, "File operations failed\n"); \
- goto label; \
- } \
-} while(0)
-
-#define STR_SIZE 1024
-#define POWER_CONVERT_TO_DECIMAL 10
+enum power_management_env global_default_env = PM_ENV_NOT_SET;
-#define POWER_GOVERNOR_USERSPACE "userspace"
-#define POWER_SYSFILE_GOVERNOR \
- "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_governor"
-#define POWER_SYSFILE_AVAIL_FREQ \
- "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_available_frequencies"
-#define POWER_SYSFILE_SETSPEED \
- "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_setspeed"
+volatile uint32_t global_env_cfg_status = 0;
-enum power_state {
- POWER_IDLE = 0,
- POWER_ONGOING,
- POWER_USED,
- POWER_UNKNOWN
-};
+/* function pointers */
+rte_power_freqs_t rte_power_freqs = NULL;
+rte_power_get_freq_t rte_power_get_freq = NULL;
+rte_power_set_freq_t rte_power_set_freq = NULL;
+rte_power_freq_change_t rte_power_freq_up = NULL;
+rte_power_freq_change_t rte_power_freq_down = NULL;
+rte_power_freq_change_t rte_power_freq_max = NULL;
+rte_power_freq_change_t rte_power_freq_min = NULL;
-/**
- * Power info per lcore.
- */
-struct rte_power_info {
- unsigned lcore_id; /**< Logical core id */
- uint32_t freqs[RTE_MAX_LCORE_FREQS]; /**< Frequency array */
- uint32_t nb_freqs; /**< number of available freqs */
- FILE *f; /**< FD of scaling_setspeed */
- char governor_ori[32]; /**< Original governor name */
- uint32_t curr_idx; /**< Freq index in freqs array */
- volatile uint32_t state; /**< Power in use state */
-} __rte_cache_aligned;
-
-static struct rte_power_info lcore_power_info[RTE_MAX_LCORE];
-
-/**
- * It is to set specific freq for specific logical core, according to the index
- * of supported frequencies.
- */
-static int
-set_freq_internal(struct rte_power_info *pi, uint32_t idx)
+int
+rte_power_set_env(enum power_management_env env)
{
- if (idx >= RTE_MAX_LCORE_FREQS || idx >= pi->nb_freqs) {
- RTE_LOG(ERR, POWER, "Invalid frequency index %u, which "
- "should be less than %u\n", idx, pi->nb_freqs);
- return -1;
- }
-
- /* Check if it is the same as current */
- if (idx == pi->curr_idx)
+ if (rte_atomic32_cmpset(&global_env_cfg_status, 0, 1) == 0) {
return 0;
-
- POWER_DEBUG_TRACE("Freqency[%u] %u to be set for lcore %u\n",
- idx, pi->freqs[idx], pi->lcore_id);
- if (fseek(pi->f, 0, SEEK_SET) < 0) {
- RTE_LOG(ERR, POWER, "Fail to set file position indicator to 0 "
- "for setting frequency for lcore %u\n", pi->lcore_id);
- return -1;
}
- if (fprintf(pi->f, "%u", pi->freqs[idx]) < 0) {
- RTE_LOG(ERR, POWER, "Fail to write new frequency for "
- "lcore %u\n", pi->lcore_id);
+ if (env == PM_ENV_ACPI_CPUFREQ) {
+ rte_power_freqs = rte_power_acpi_cpufreq_freqs;
+ rte_power_get_freq = rte_power_acpi_cpufreq_get_freq;
+ rte_power_set_freq = rte_power_acpi_cpufreq_set_freq;
+ rte_power_freq_up = rte_power_acpi_cpufreq_freq_up;
+ rte_power_freq_down = rte_power_acpi_cpufreq_freq_down;
+ rte_power_freq_min = rte_power_acpi_cpufreq_freq_min;
+ rte_power_freq_max = rte_power_acpi_cpufreq_freq_max;
+ } else if (env == PM_ENV_KVM_VM) {
+ rte_power_freqs = rte_power_kvm_vm_freqs;
+ rte_power_get_freq = rte_power_kvm_vm_get_freq;
+ rte_power_set_freq = rte_power_kvm_vm_set_freq;
+ rte_power_freq_up = rte_power_kvm_vm_freq_up;
+ rte_power_freq_down = rte_power_kvm_vm_freq_down;
+ rte_power_freq_min = rte_power_kvm_vm_freq_min;
+ rte_power_freq_max = rte_power_kvm_vm_freq_max;
+ } else {
+ RTE_LOG(ERR, POWER, "Invalid Power Management Environment(%d) set\n",
+ env);
+ rte_power_unset_env();
return -1;
}
- fflush(pi->f);
- pi->curr_idx = idx;
-
- return 1;
-}
-
-/**
- * It is to check the current scaling governor by reading sys file, and then
- * set it into 'userspace' if it is not by writing the sys file. The original
- * governor will be saved for rolling back.
- */
-static int
-power_set_governor_userspace(struct rte_power_info *pi)
-{
- FILE *f;
- int ret = -1;
- char buf[BUFSIZ];
- char fullpath[PATH_MAX];
- char *s;
- int val;
-
- snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
- pi->lcore_id);
- f = fopen(fullpath, "rw+");
- FOPEN_OR_ERR_RET(f, ret);
-
- s = fgets(buf, sizeof(buf), f);
- FOPS_OR_NULL_GOTO(s, out);
-
- /* Check if current governor is userspace */
- if (strncmp(buf, POWER_GOVERNOR_USERSPACE,
- sizeof(POWER_GOVERNOR_USERSPACE)) == 0) {
- ret = 0;
- POWER_DEBUG_TRACE("Power management governor of lcore %u is "
- "already userspace\n", pi->lcore_id);
- goto out;
- }
- /* Save the original governor */
- snprintf(pi->governor_ori, sizeof(pi->governor_ori), "%s", buf);
-
- /* Write 'userspace' to the governor */
- val = fseek(f, 0, SEEK_SET);
- FOPS_OR_ERR_GOTO(val, out);
-
- val = fputs(POWER_GOVERNOR_USERSPACE, f);
- FOPS_OR_ERR_GOTO(val, out);
-
- ret = 0;
- RTE_LOG(INFO, POWER, "Power management governor of lcore %u has been "
- "set to user space successfully\n", pi->lcore_id);
-out:
- fclose(f);
+ global_default_env = env;
+ return 0;
- return ret;
}
-/**
- * It is to get the available frequencies of the specific lcore by reading the
- * sys file.
- */
-static int
-power_get_available_freqs(struct rte_power_info *pi)
+void
+rte_power_unset_env(void)
{
- FILE *f;
- int ret = -1, i, count;
- char *p;
- char buf[BUFSIZ];
- char fullpath[PATH_MAX];
- char *freqs[RTE_MAX_LCORE_FREQS];
- char *s;
-
- snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_AVAIL_FREQ,
- pi->lcore_id);
- f = fopen(fullpath, "r");
- FOPEN_OR_ERR_RET(f, ret);
-
- s = fgets(buf, sizeof(buf), f);
- FOPS_OR_NULL_GOTO(s, out);
-
- /* Strip the line break if there is */
- p = strchr(buf, '\n');
- if (p != NULL)
- *p = 0;
-
- /* Split string into at most RTE_MAX_LCORE_FREQS frequencies */
- count = rte_strsplit(buf, sizeof(buf), freqs,
- RTE_MAX_LCORE_FREQS, ' ');
- if (count <= 0) {
- RTE_LOG(ERR, POWER, "No available frequency in "
- ""POWER_SYSFILE_AVAIL_FREQ"\n", pi->lcore_id);
- goto out;
- }
- if (count >= RTE_MAX_LCORE_FREQS) {
- RTE_LOG(ERR, POWER, "Too many available frequencies : %d\n",
- count);
- goto out;
- }
-
- /* Store the available frequncies into power context */
- for (i = 0, pi->nb_freqs = 0; i < count; i++) {
- POWER_DEBUG_TRACE("Lcore %u frequency[%d]: %s\n", pi->lcore_id,
- i, freqs[i]);
- pi->freqs[pi->nb_freqs++] = strtoul(freqs[i], &p,
- POWER_CONVERT_TO_DECIMAL);
- }
-
- ret = 0;
- POWER_DEBUG_TRACE("%d frequencie(s) of lcore %u are available\n",
- count, pi->lcore_id);
-out:
- fclose(f);
-
- return ret;
+ if (rte_atomic32_cmpset(&global_env_cfg_status, 1, 0) != 0)
+ global_default_env = PM_ENV_NOT_SET;
}
-/**
- * It is to fopen the sys file for the future setting the lcore frequency.
- */
-static int
-power_init_for_setting_freq(struct rte_power_info *pi)
-{
- FILE *f;
- char fullpath[PATH_MAX];
- char buf[BUFSIZ];
- uint32_t i, freq;
- char *s;
-
- snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_SETSPEED,
- pi->lcore_id);
- f = fopen(fullpath, "rw+");
- FOPEN_OR_ERR_RET(f, -1);
-
- s = fgets(buf, sizeof(buf), f);
- FOPS_OR_NULL_GOTO(s, out);
-
- freq = strtoul(buf, NULL, POWER_CONVERT_TO_DECIMAL);
- for (i = 0; i < pi->nb_freqs; i++) {
- if (freq == pi->freqs[i]) {
- pi->curr_idx = i;
- pi->f = f;
- return 0;
- }
- }
-
-out:
- fclose(f);
-
- return -1;
+enum power_management_env
+rte_power_get_env(void) {
+ return global_default_env;
}
int
rte_power_init(unsigned lcore_id)
{
- struct rte_power_info *pi;
-
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
- lcore_id, RTE_MAX_LCORE - 1U);
- return -1;
- }
-
- pi = &lcore_power_info[lcore_id];
- if (rte_atomic32_cmpset(&(pi->state), POWER_IDLE, POWER_ONGOING)
- == 0) {
- RTE_LOG(INFO, POWER, "Power management of lcore %u is "
- "in use\n", lcore_id);
- return -1;
- }
-
- pi->lcore_id = lcore_id;
- /* Check and set the governor */
- if (power_set_governor_userspace(pi) < 0) {
- RTE_LOG(ERR, POWER, "Cannot set governor of lcore %u to "
- "userspace\n", lcore_id);
- goto fail;
- }
+ int ret = -1;
- /* Get the available frequencies */
- if (power_get_available_freqs(pi) < 0) {
- RTE_LOG(ERR, POWER, "Cannot get available frequencies of "
- "lcore %u\n", lcore_id);
- goto fail;
+ if (global_default_env == PM_ENV_ACPI_CPUFREQ) {
+ return rte_power_acpi_cpufreq_init(lcore_id);
}
-
- /* Init for setting lcore frequency */
- if (power_init_for_setting_freq(pi) < 0) {
- RTE_LOG(ERR, POWER, "Cannot init for setting frequency for "
- "lcore %u\n", lcore_id);
- goto fail;
+ if (global_default_env == PM_ENV_KVM_VM) {
+ return rte_power_kvm_vm_init(lcore_id);
}
-
- /* Set freq to max by default */
- if (rte_power_freq_max(lcore_id) < 0) {
- RTE_LOG(ERR, POWER, "Cannot set frequency of lcore %u "
- "to max\n", lcore_id);
- goto fail;
+ /* Auto detect Environment */
+ RTE_LOG(INFO, POWER, "Attempting to initialise ACPI cpufreq power "
+ "management...\n");
+ ret = rte_power_acpi_cpufreq_init(lcore_id);
+ if (ret == 0) {
+ rte_power_set_env(PM_ENV_ACPI_CPUFREQ);
+ goto out;
}
- RTE_LOG(INFO, POWER, "Initialized successfully for lcore %u "
- "power manamgement\n", lcore_id);
- rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_USED);
-
- return 0;
-
-fail:
- rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
-
- return -1;
-}
-
-/**
- * It is to check the governor and then set the original governor back if
- * needed by writing the the sys file.
- */
-static int
-power_set_governor_original(struct rte_power_info *pi)
-{
- FILE *f;
- int ret = -1;
- char buf[BUFSIZ];
- char fullpath[PATH_MAX];
- char *s;
- int val;
-
- snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
- pi->lcore_id);
- f = fopen(fullpath, "rw+");
- FOPEN_OR_ERR_RET(f, ret);
-
- s = fgets(buf, sizeof(buf), f);
- FOPS_OR_NULL_GOTO(s, out);
-
- /* Check if the governor to be set is the same as current */
- if (strncmp(buf, pi->governor_ori, sizeof(pi->governor_ori)) == 0) {
- ret = 0;
- POWER_DEBUG_TRACE("Power management governor of lcore %u "
- "has already been set to %s\n",
- pi->lcore_id, pi->governor_ori);
+ RTE_LOG(INFO, POWER, "Attempting to initialise VM power management...\n");
+ ret = rte_power_kvm_vm_init(lcore_id);
+ if (ret == 0) {
+ rte_power_set_env(PM_ENV_KVM_VM);
goto out;
}
-
- /* Write back the original governor */
- val = fseek(f, 0, SEEK_SET);
- FOPS_OR_ERR_GOTO(val, out);
-
- val = fputs(pi->governor_ori, f);
- FOPS_OR_ERR_GOTO(val, out);
-
- ret = 0;
- RTE_LOG(INFO, POWER, "Power manamgement governor of lcore %u "
- "has been set back to %s successfully\n",
- pi->lcore_id, pi->governor_ori);
+ RTE_LOG(ERR, POWER, "Unable to set Power Management Environment for lcore "
+ "%u\n", lcore_id);
out:
- fclose(f);
-
return ret;
}
int
rte_power_exit(unsigned lcore_id)
{
- struct rte_power_info *pi;
-
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
- lcore_id, RTE_MAX_LCORE - 1U);
- return -1;
- }
- pi = &lcore_power_info[lcore_id];
- if (rte_atomic32_cmpset(&(pi->state), POWER_USED, POWER_ONGOING)
- == 0) {
- RTE_LOG(INFO, POWER, "Power management of lcore %u is "
- "not used\n", lcore_id);
- return -1;
- }
-
- /* Close FD of setting freq */
- fclose(pi->f);
- pi->f = NULL;
-
- /* Set the governor back to the original */
- if (power_set_governor_original(pi) < 0) {
- RTE_LOG(ERR, POWER, "Cannot set the governor of %u back "
- "to the original\n", lcore_id);
- goto fail;
- }
-
- RTE_LOG(INFO, POWER, "Power management of lcore %u has exited from "
- "'userspace' mode and been set back to the "
- "original\n", lcore_id);
- rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_IDLE);
-
- return 0;
-
-fail:
- rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
+ if (global_default_env == PM_ENV_ACPI_CPUFREQ)
+ return rte_power_acpi_cpufreq_exit(lcore_id);
+ if (global_default_env == PM_ENV_KVM_VM)
+ return rte_power_kvm_vm_exit(lcore_id);
+ RTE_LOG(ERR, POWER, "Environment has not been set, unable to exit "
+ "gracefully\n");
return -1;
-}
-
-uint32_t
-rte_power_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num)
-{
- struct rte_power_info *pi;
-
- if (lcore_id >= RTE_MAX_LCORE || !freqs) {
- RTE_LOG(ERR, POWER, "Invalid input parameter\n");
- return 0;
- }
-
- pi = &lcore_power_info[lcore_id];
- if (num < pi->nb_freqs) {
- RTE_LOG(ERR, POWER, "Buffer size is not enough\n");
- return 0;
- }
- rte_memcpy(freqs, pi->freqs, pi->nb_freqs * sizeof(uint32_t));
-
- return pi->nb_freqs;
-}
-
-uint32_t
-rte_power_get_freq(unsigned lcore_id)
-{
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
- return RTE_POWER_INVALID_FREQ_INDEX;
- }
-
- return lcore_power_info[lcore_id].curr_idx;
-}
-
-int
-rte_power_set_freq(unsigned lcore_id, uint32_t index)
-{
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
- return -1;
- }
-
- return set_freq_internal(&(lcore_power_info[lcore_id]), index);
-}
-
-int
-rte_power_freq_down(unsigned lcore_id)
-{
- struct rte_power_info *pi;
-
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
- return -1;
- }
- pi = &lcore_power_info[lcore_id];
- if (pi->curr_idx + 1 == pi->nb_freqs)
- return 0;
-
- /* Frequencies in the array are from high to low. */
- return set_freq_internal(pi, pi->curr_idx + 1);
}
-
-int
-rte_power_freq_up(unsigned lcore_id)
-{
- struct rte_power_info *pi;
-
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
- return -1;
- }
-
- pi = &lcore_power_info[lcore_id];
- if (pi->curr_idx == 0)
- return 0;
-
- /* Frequencies in the array are from high to low. */
- return set_freq_internal(pi, pi->curr_idx - 1);
-}
-
-int
-rte_power_freq_max(unsigned lcore_id)
-{
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
- return -1;
- }
-
- /* Frequencies in the array are from high to low. */
- return set_freq_internal(&lcore_power_info[lcore_id], 0);
-}
-
-int
-rte_power_freq_min(unsigned lcore_id)
-{
- struct rte_power_info *pi;
-
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
- return -1;
- }
-
- pi = &lcore_power_info[lcore_id];
-
- /* Frequencies in the array are from high to low. */
- return set_freq_internal(pi, pi->nb_freqs - 1);
-}
-
diff --git a/lib/librte_power/rte_power.h b/lib/librte_power/rte_power.h
index 9c1419e..9338069 100644
--- a/lib/librte_power/rte_power.h
+++ b/lib/librte_power/rte_power.h
@@ -48,12 +48,48 @@
extern "C" {
#endif
-#define RTE_POWER_INVALID_FREQ_INDEX (~0)
+/* Power Management Environment State */
+enum power_management_env {PM_ENV_NOT_SET, PM_ENV_ACPI_CPUFREQ, PM_ENV_KVM_VM};
/**
- * Initialize power management for a specific lcore. It will check and set the
- * governor to userspace for the lcore, get the available frequencies, and
- * prepare to set new lcore frequency.
+ * Set the default power management implementation. If this is not called prior
+ * to rte_power_init(), then auto-detect of the environment will take place.
+ * It is not thread safe.
+ *
+ * @param env
+ * env. The environment in which to initialise Power Management for.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_set_env(enum power_management_env env);
+
+/**
+ * Unset the global environment configuration.
+ * This can only be called after all threads have completed.
+ *
+ * @param None.
+ *
+ * @return
+ * None.
+ */
+void rte_power_unset_env(void);
+
+/**
+ * Get the default power management implementation.
+ *
+ * @param None.
+ *
+ * @return
+ * power_management_env The configured environment.
+ */
+enum power_management_env rte_power_get_env(void);
+
+/**
+ * Initialize power management for a specific lcore. If rte_power_set_env() has
+ * not been called then an auto-detect of the environment will start and
+ * initialise the corresponding resources.
*
* @param lcore_id
* lcore id.
@@ -65,8 +101,9 @@ extern "C" {
int rte_power_init(unsigned lcore_id);
/**
- * Exit power management on a specific lcore. It will set the governor to which
- * is before initialized.
+ * Exit power management on a specific lcore. This will call the environment
+ * dependent exit function.
+ *
*
* @param lcore_id
* lcore id.
@@ -78,11 +115,9 @@ int rte_power_init(unsigned lcore_id);
int rte_power_exit(unsigned lcore_id);
/**
- * Get the available frequencies of a specific lcore. The return value will be
- * the minimal one of the total number of available frequencies and the number
- * of buffer. The index of available frequencies used in other interfaces
- * should be in the range of 0 to this return value.
- * It should be protected outside of this function for threadsafe.
+ * Get the available frequencies of a specific lcore.
+ * Function pointer definition. Review each environments
+ * specific documentation for usage.
*
* @param lcore_id
* lcore id.
@@ -94,12 +129,15 @@ int rte_power_exit(unsigned lcore_id);
* @return
* The number of available frequencies.
*/
-uint32_t rte_power_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num);
+typedef uint32_t (*rte_power_freqs_t)(unsigned lcore_id, uint32_t *freqs,
+ uint32_t num);
+
+extern rte_power_freqs_t rte_power_freqs;
/**
- * Return the current index of available frequencies of a specific lcore. It
- * will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)' if error.
- * It should be protected outside of this function for threadsafe.
+ * Return the current index of available frequencies of a specific lcore.
+ * Function pointer definition. Review each environments
+ * specific documentation for usage.
*
* @param lcore_id
* lcore id.
@@ -107,12 +145,15 @@ uint32_t rte_power_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num);
* @return
* The current index of available frequencies.
*/
-uint32_t rte_power_get_freq(unsigned lcore_id);
+typedef uint32_t (*rte_power_get_freq_t)(unsigned lcore_id);
+
+extern rte_power_get_freq_t rte_power_get_freq;
/**
* Set the new frequency for a specific lcore by indicating the index of
* available frequencies.
- * It should be protected outside of this function for threadsafe.
+ * Function pointer definition. Review each environments
+ * specific documentation for usage.
*
* @param lcore_id
* lcore id.
@@ -121,70 +162,87 @@ uint32_t rte_power_get_freq(unsigned lcore_id);
*
* @return
* - 1 on success with frequency changed.
- * - 0 on success without frequency chnaged.
+ * - 0 on success without frequency changed.
* - Negative on error.
*/
-int rte_power_set_freq(unsigned lcore_id, uint32_t index);
+typedef int (*rte_power_set_freq_t)(unsigned lcore_id, uint32_t index);
+
+extern rte_power_set_freq_t rte_power_set_freq;
+
+/**
+ * Function pointer definition for generic frequency change functions. Review
+ * each environments specific documentation for usage.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+typedef int (*rte_power_freq_change_t)(unsigned lcore_id);
/**
* Scale up the frequency of a specific lcore according to the available
* frequencies.
- * It should be protected outside of this function for threadsafe.
+ * Review each environments specific documentation for usage.
*
* @param lcore_id
* lcore id.
*
* @return
* - 1 on success with frequency changed.
- * - 0 on success without frequency chnaged.
+ * - 0 on success without frequency changed.
* - Negative on error.
*/
-int rte_power_freq_up(unsigned lcore_id);
+extern rte_power_freq_change_t rte_power_freq_up;
/**
* Scale down the frequency of a specific lcore according to the available
* frequencies.
- * It should be protected outside of this function for threadsafe.
+ * Review each environments specific documentation for usage.
*
* @param lcore_id
* lcore id.
*
* @return
* - 1 on success with frequency changed.
- * - 0 on success without frequency chnaged.
+ * - 0 on success without frequency changed.
* - Negative on error.
*/
-int rte_power_freq_down(unsigned lcore_id);
+
+extern rte_power_freq_change_t rte_power_freq_down;
/**
* Scale up the frequency of a specific lcore to the highest according to the
* available frequencies.
- * It should be protected outside of this function for threadsafe.
+ * Review each environments specific documentation for usage.
*
* @param lcore_id
* lcore id.
*
* @return
* - 1 on success with frequency changed.
- * - 0 on success without frequency chnaged.
+ * - 0 on success without frequency changed.
* - Negative on error.
*/
-int rte_power_freq_max(unsigned lcore_id);
+extern rte_power_freq_change_t rte_power_freq_max;
/**
* Scale down the frequency of a specific lcore to the lowest according to the
* available frequencies.
- * It should be protected outside of this function for threadsafe.
+ * Review each environments specific documentation for usage..
*
* @param lcore_id
* lcore id.
*
* @return
* - 1 on success with frequency changed.
- * - 0 on success without frequency chnaged.
+ * - 0 on success without frequency changed.
* - Negative on error.
*/
-int rte_power_freq_min(unsigned lcore_id);
+rte_power_freq_change_t rte_power_freq_min;
#ifdef __cplusplus
}
diff --git a/lib/librte_power/rte_power_acpi_cpufreq.c b/lib/librte_power/rte_power_acpi_cpufreq.c
new file mode 100644
index 0000000..a56c9b5
--- /dev/null
+++ b/lib/librte_power/rte_power_acpi_cpufreq.c
@@ -0,0 +1,545 @@
+/*-
+ * 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <limits.h>
+
+#include <rte_memcpy.h>
+#include <rte_atomic.h>
+
+#include "rte_power_acpi_cpufreq.h"
+#include "rte_power_common.h"
+
+#ifdef RTE_LIBRTE_POWER_DEBUG
+#define POWER_DEBUG_TRACE(fmt, args...) do { \
+ RTE_LOG(ERR, POWER, "%s: " fmt, __func__, ## args); \
+} while (0)
+#else
+#define POWER_DEBUG_TRACE(fmt, args...)
+#endif
+
+#define FOPEN_OR_ERR_RET(f, retval) do { \
+ if ((f) == NULL) { \
+ RTE_LOG(ERR, POWER, "File not openned\n"); \
+ return retval; \
+ } \
+} while (0)
+
+#define FOPS_OR_NULL_GOTO(ret, label) do { \
+ if ((ret) == NULL) { \
+ RTE_LOG(ERR, POWER, "fgets returns nothing\n"); \
+ goto label; \
+ } \
+} while (0)
+
+#define FOPS_OR_ERR_GOTO(ret, label) do { \
+ if ((ret) < 0) { \
+ RTE_LOG(ERR, POWER, "File operations failed\n"); \
+ goto label; \
+ } \
+} while (0)
+
+#define STR_SIZE 1024
+#define POWER_CONVERT_TO_DECIMAL 10
+
+#define POWER_GOVERNOR_USERSPACE "userspace"
+#define POWER_SYSFILE_GOVERNOR \
+ "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_governor"
+#define POWER_SYSFILE_AVAIL_FREQ \
+ "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_available_frequencies"
+#define POWER_SYSFILE_SETSPEED \
+ "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_setspeed"
+
+enum power_state {
+ POWER_IDLE = 0,
+ POWER_ONGOING,
+ POWER_USED,
+ POWER_UNKNOWN
+};
+
+/**
+ * Power info per lcore.
+ */
+struct rte_power_info {
+ unsigned lcore_id; /**< Logical core id */
+ uint32_t freqs[RTE_MAX_LCORE_FREQS]; /**< Frequency array */
+ uint32_t nb_freqs; /**< number of available freqs */
+ FILE *f; /**< FD of scaling_setspeed */
+ char governor_ori[32]; /**< Original governor name */
+ uint32_t curr_idx; /**< Freq index in freqs array */
+ volatile uint32_t state; /**< Power in use state */
+} __rte_cache_aligned;
+
+static struct rte_power_info lcore_power_info[RTE_MAX_LCORE];
+
+/**
+ * It is to set specific freq for specific logical core, according to the index
+ * of supported frequencies.
+ */
+static int
+set_freq_internal(struct rte_power_info *pi, uint32_t idx)
+{
+ if (idx >= RTE_MAX_LCORE_FREQS || idx >= pi->nb_freqs) {
+ RTE_LOG(ERR, POWER, "Invalid frequency index %u, which "
+ "should be less than %u\n", idx, pi->nb_freqs);
+ return -1;
+ }
+
+ /* Check if it is the same as current */
+ if (idx == pi->curr_idx)
+ return 0;
+
+ POWER_DEBUG_TRACE("Freqency[%u] %u to be set for lcore %u\n",
+ idx, pi->freqs[idx], pi->lcore_id);
+ if (fseek(pi->f, 0, SEEK_SET) < 0) {
+ RTE_LOG(ERR, POWER, "Fail to set file position indicator to 0 "
+ "for setting frequency for lcore %u\n", pi->lcore_id);
+ return -1;
+ }
+ if (fprintf(pi->f, "%u", pi->freqs[idx]) < 0) {
+ RTE_LOG(ERR, POWER, "Fail to write new frequency for "
+ "lcore %u\n", pi->lcore_id);
+ return -1;
+ }
+ fflush(pi->f);
+ pi->curr_idx = idx;
+
+ return 1;
+}
+
+/**
+ * It is to check the current scaling governor by reading sys file, and then
+ * set it into 'userspace' if it is not by writing the sys file. The original
+ * governor will be saved for rolling back.
+ */
+static int
+power_set_governor_userspace(struct rte_power_info *pi)
+{
+ FILE *f;
+ int ret = -1;
+ char buf[BUFSIZ];
+ char fullpath[PATH_MAX];
+ char *s;
+ int val;
+
+ snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
+ pi->lcore_id);
+ f = fopen(fullpath, "rw+");
+ FOPEN_OR_ERR_RET(f, ret);
+
+ s = fgets(buf, sizeof(buf), f);
+ FOPS_OR_NULL_GOTO(s, out);
+
+ /* Check if current governor is userspace */
+ if (strncmp(buf, POWER_GOVERNOR_USERSPACE,
+ sizeof(POWER_GOVERNOR_USERSPACE)) == 0) {
+ ret = 0;
+ POWER_DEBUG_TRACE("Power management governor of lcore %u is "
+ "already userspace\n", pi->lcore_id);
+ goto out;
+ }
+ /* Save the original governor */
+ snprintf(pi->governor_ori, sizeof(pi->governor_ori), "%s", buf);
+
+ /* Write 'userspace' to the governor */
+ val = fseek(f, 0, SEEK_SET);
+ FOPS_OR_ERR_GOTO(val, out);
+
+ val = fputs(POWER_GOVERNOR_USERSPACE, f);
+ FOPS_OR_ERR_GOTO(val, out);
+
+ ret = 0;
+ RTE_LOG(INFO, POWER, "Power management governor of lcore %u has been "
+ "set to user space successfully\n", pi->lcore_id);
+out:
+ fclose(f);
+
+ return ret;
+}
+
+/**
+ * It is to get the available frequencies of the specific lcore by reading the
+ * sys file.
+ */
+static int
+power_get_available_freqs(struct rte_power_info *pi)
+{
+ FILE *f;
+ int ret = -1, i, count;
+ char *p;
+ char buf[BUFSIZ];
+ char fullpath[PATH_MAX];
+ char *freqs[RTE_MAX_LCORE_FREQS];
+ char *s;
+
+ snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_AVAIL_FREQ,
+ pi->lcore_id);
+ f = fopen(fullpath, "r");
+ FOPEN_OR_ERR_RET(f, ret);
+
+ s = fgets(buf, sizeof(buf), f);
+ FOPS_OR_NULL_GOTO(s, out);
+
+ /* Strip the line break if there is */
+ p = strchr(buf, '\n');
+ if (p != NULL)
+ *p = 0;
+
+ /* Split string into at most RTE_MAX_LCORE_FREQS frequencies */
+ count = rte_strsplit(buf, sizeof(buf), freqs,
+ RTE_MAX_LCORE_FREQS, ' ');
+ if (count <= 0) {
+ RTE_LOG(ERR, POWER, "No available frequency in "
+ ""POWER_SYSFILE_AVAIL_FREQ"\n", pi->lcore_id);
+ goto out;
+ }
+ if (count >= RTE_MAX_LCORE_FREQS) {
+ RTE_LOG(ERR, POWER, "Too many available frequencies : %d\n",
+ count);
+ goto out;
+ }
+
+ /* Store the available frequncies into power context */
+ for (i = 0, pi->nb_freqs = 0; i < count; i++) {
+ POWER_DEBUG_TRACE("Lcore %u frequency[%d]: %s\n", pi->lcore_id,
+ i, freqs[i]);
+ pi->freqs[pi->nb_freqs++] = strtoul(freqs[i], &p,
+ POWER_CONVERT_TO_DECIMAL);
+ }
+
+ ret = 0;
+ POWER_DEBUG_TRACE("%d frequencie(s) of lcore %u are available\n",
+ count, pi->lcore_id);
+out:
+ fclose(f);
+
+ return ret;
+}
+
+/**
+ * It is to fopen the sys file for the future setting the lcore frequency.
+ */
+static int
+power_init_for_setting_freq(struct rte_power_info *pi)
+{
+ FILE *f;
+ char fullpath[PATH_MAX];
+ char buf[BUFSIZ];
+ uint32_t i, freq;
+ char *s;
+
+ snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_SETSPEED,
+ pi->lcore_id);
+ f = fopen(fullpath, "rw+");
+ FOPEN_OR_ERR_RET(f, -1);
+
+ s = fgets(buf, sizeof(buf), f);
+ FOPS_OR_NULL_GOTO(s, out);
+
+ freq = strtoul(buf, NULL, POWER_CONVERT_TO_DECIMAL);
+ for (i = 0; i < pi->nb_freqs; i++) {
+ if (freq == pi->freqs[i]) {
+ pi->curr_idx = i;
+ pi->f = f;
+ return 0;
+ }
+ }
+
+out:
+ fclose(f);
+
+ return -1;
+}
+
+int
+rte_power_acpi_cpufreq_init(unsigned lcore_id)
+{
+ struct rte_power_info *pi;
+
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
+ lcore_id, RTE_MAX_LCORE - 1U);
+ return -1;
+ }
+
+ pi = &lcore_power_info[lcore_id];
+ if (rte_atomic32_cmpset(&(pi->state), POWER_IDLE, POWER_ONGOING)
+ == 0) {
+ RTE_LOG(INFO, POWER, "Power management of lcore %u is "
+ "in use\n", lcore_id);
+ return -1;
+ }
+
+ pi->lcore_id = lcore_id;
+ /* Check and set the governor */
+ if (power_set_governor_userspace(pi) < 0) {
+ RTE_LOG(ERR, POWER, "Cannot set governor of lcore %u to "
+ "userspace\n", lcore_id);
+ goto fail;
+ }
+
+ /* Get the available frequencies */
+ if (power_get_available_freqs(pi) < 0) {
+ RTE_LOG(ERR, POWER, "Cannot get available frequencies of "
+ "lcore %u\n", lcore_id);
+ goto fail;
+ }
+
+ /* Init for setting lcore frequency */
+ if (power_init_for_setting_freq(pi) < 0) {
+ RTE_LOG(ERR, POWER, "Cannot init for setting frequency for "
+ "lcore %u\n", lcore_id);
+ goto fail;
+ }
+
+ /* Set freq to max by default */
+ if (rte_power_acpi_cpufreq_freq_max(lcore_id) < 0) {
+ RTE_LOG(ERR, POWER, "Cannot set frequency of lcore %u "
+ "to max\n", lcore_id);
+ goto fail;
+ }
+
+ RTE_LOG(INFO, POWER, "Initialized successfully for lcore %u "
+ "power manamgement\n", lcore_id);
+ rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_USED);
+
+ return 0;
+
+fail:
+ rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
+
+ return -1;
+}
+
+/**
+ * It is to check the governor and then set the original governor back if
+ * needed by writing the the sys file.
+ */
+static int
+power_set_governor_original(struct rte_power_info *pi)
+{
+ FILE *f;
+ int ret = -1;
+ char buf[BUFSIZ];
+ char fullpath[PATH_MAX];
+ char *s;
+ int val;
+
+ snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
+ pi->lcore_id);
+ f = fopen(fullpath, "rw+");
+ FOPEN_OR_ERR_RET(f, ret);
+
+ s = fgets(buf, sizeof(buf), f);
+ FOPS_OR_NULL_GOTO(s, out);
+
+ /* Check if the governor to be set is the same as current */
+ if (strncmp(buf, pi->governor_ori, sizeof(pi->governor_ori)) == 0) {
+ ret = 0;
+ POWER_DEBUG_TRACE("Power management governor of lcore %u "
+ "has already been set to %s\n",
+ pi->lcore_id, pi->governor_ori);
+ goto out;
+ }
+
+ /* Write back the original governor */
+ val = fseek(f, 0, SEEK_SET);
+ FOPS_OR_ERR_GOTO(val, out);
+
+ val = fputs(pi->governor_ori, f);
+ FOPS_OR_ERR_GOTO(val, out);
+
+ ret = 0;
+ RTE_LOG(INFO, POWER, "Power management governor of lcore %u "
+ "has been set back to %s successfully\n",
+ pi->lcore_id, pi->governor_ori);
+out:
+ fclose(f);
+
+ return ret;
+}
+
+int
+rte_power_acpi_cpufreq_exit(unsigned lcore_id)
+{
+ struct rte_power_info *pi;
+
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
+ lcore_id, RTE_MAX_LCORE - 1U);
+ return -1;
+ }
+ pi = &lcore_power_info[lcore_id];
+ if (rte_atomic32_cmpset(&(pi->state), POWER_USED, POWER_ONGOING)
+ == 0) {
+ RTE_LOG(INFO, POWER, "Power management of lcore %u is "
+ "not used\n", lcore_id);
+ return -1;
+ }
+
+ /* Close FD of setting freq */
+ fclose(pi->f);
+ pi->f = NULL;
+
+ /* Set the governor back to the original */
+ if (power_set_governor_original(pi) < 0) {
+ RTE_LOG(ERR, POWER, "Cannot set the governor of %u back "
+ "to the original\n", lcore_id);
+ goto fail;
+ }
+
+ RTE_LOG(INFO, POWER, "Power management of lcore %u has exited from "
+ "'userspace' mode and been set back to the "
+ "original\n", lcore_id);
+ rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_IDLE);
+
+ return 0;
+
+fail:
+ rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
+
+ return -1;
+}
+
+uint32_t
+rte_power_acpi_cpufreq_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num)
+{
+ struct rte_power_info *pi;
+
+ if (lcore_id >= RTE_MAX_LCORE || !freqs) {
+ RTE_LOG(ERR, POWER, "Invalid input parameter\n");
+ return 0;
+ }
+
+ pi = &lcore_power_info[lcore_id];
+ if (num < pi->nb_freqs) {
+ RTE_LOG(ERR, POWER, "Buffer size is not enough\n");
+ return 0;
+ }
+ rte_memcpy(freqs, pi->freqs, pi->nb_freqs * sizeof(uint32_t));
+
+ return pi->nb_freqs;
+}
+
+uint32_t
+rte_power_acpi_cpufreq_get_freq(unsigned lcore_id)
+{
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+ return RTE_POWER_INVALID_FREQ_INDEX;
+ }
+
+ return lcore_power_info[lcore_id].curr_idx;
+}
+
+int
+rte_power_acpi_cpufreq_set_freq(unsigned lcore_id, uint32_t index)
+{
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+ return -1;
+ }
+
+ return set_freq_internal(&(lcore_power_info[lcore_id]), index);
+}
+
+int
+rte_power_acpi_cpufreq_freq_down(unsigned lcore_id)
+{
+ struct rte_power_info *pi;
+
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+ return -1;
+ }
+
+ pi = &lcore_power_info[lcore_id];
+ if (pi->curr_idx + 1 == pi->nb_freqs)
+ return 0;
+
+ /* Frequencies in the array are from high to low. */
+ return set_freq_internal(pi, pi->curr_idx + 1);
+}
+
+int
+rte_power_acpi_cpufreq_freq_up(unsigned lcore_id)
+{
+ struct rte_power_info *pi;
+
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+ return -1;
+ }
+
+ pi = &lcore_power_info[lcore_id];
+ if (pi->curr_idx == 0)
+ return 0;
+
+ /* Frequencies in the array are from high to low. */
+ return set_freq_internal(pi, pi->curr_idx - 1);
+}
+
+int
+rte_power_acpi_cpufreq_freq_max(unsigned lcore_id)
+{
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+ return -1;
+ }
+
+ /* Frequencies in the array are from high to low. */
+ return set_freq_internal(&lcore_power_info[lcore_id], 0);
+}
+
+int
+rte_power_acpi_cpufreq_freq_min(unsigned lcore_id)
+{
+ struct rte_power_info *pi;
+
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+ return -1;
+ }
+
+ pi = &lcore_power_info[lcore_id];
+
+ /* Frequencies in the array are from high to low. */
+ return set_freq_internal(pi, pi->nb_freqs - 1);
+}
diff --git a/lib/librte_power/rte_power_acpi_cpufreq.h b/lib/librte_power/rte_power_acpi_cpufreq.h
new file mode 100644
index 0000000..68578e9
--- /dev/null
+++ b/lib/librte_power/rte_power_acpi_cpufreq.h
@@ -0,0 +1,192 @@
+/*-
+ * 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 _RTE_POWER_ACPI_CPUFREQ_H
+#define _RTE_POWER_ACPI_CPUFREQ_H
+
+/**
+ * @file
+ * RTE Power Management via userspace ACPI cpufreq
+ */
+
+#include <rte_common.h>
+#include <rte_byteorder.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Initialize power management for a specific lcore. It will check and set the
+ * governor to userspace for the lcore, get the available frequencies, and
+ * prepare to set new lcore frequency.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_init(unsigned lcore_id);
+
+/**
+ * Exit power management on a specific lcore. It will set the governor to which
+ * is before initialized.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_exit(unsigned lcore_id);
+
+/**
+ * Get the available frequencies of a specific lcore. The return value will be
+ * the minimal one of the total number of available frequencies and the number
+ * of buffer. The index of available frequencies used in other interfaces
+ * should be in the range of 0 to this return value.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ * @param freqs
+ * The buffer array to save the frequencies.
+ * @param num
+ * The number of frequencies to get.
+ *
+ * @return
+ * The number of available frequencies.
+ */
+uint32_t rte_power_acpi_cpufreq_freqs(unsigned lcore_id, uint32_t *freqs,
+ uint32_t num);
+
+/**
+ * Return the current index of available frequencies of a specific lcore. It
+ * will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)' if error.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * The current index of available frequencies.
+ */
+uint32_t rte_power_acpi_cpufreq_get_freq(unsigned lcore_id);
+
+/**
+ * Set the new frequency for a specific lcore by indicating the index of
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ * @param index
+ * The index of available frequencies.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_set_freq(unsigned lcore_id, uint32_t index);
+
+/**
+ * Scale up the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_up(unsigned lcore_id);
+
+/**
+ * Scale down the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_down(unsigned lcore_id);
+
+/**
+ * Scale up the frequency of a specific lcore to the highest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_max(unsigned lcore_id);
+
+/**
+ * Scale down the frequency of a specific lcore to the lowest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency chnaged.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_min(unsigned lcore_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/librte_power/rte_power_common.h b/lib/librte_power/rte_power_common.h
new file mode 100644
index 0000000..64bd168
--- /dev/null
+++ b/lib/librte_power/rte_power_common.h
@@ -0,0 +1,39 @@
+/*-
+ * 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 RTE_POWER_COMMON_H_
+#define RTE_POWER_COMMON_H_
+
+#define RTE_POWER_INVALID_FREQ_INDEX (~0)
+
+#endif /* RTE_POWER_COMMON_H_ */
diff --git a/lib/librte_power/rte_power_kvm_vm.c b/lib/librte_power/rte_power_kvm_vm.c
new file mode 100644
index 0000000..11596c3
--- /dev/null
+++ b/lib/librte_power/rte_power_kvm_vm.c
@@ -0,0 +1,136 @@
+/*-
+ * 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 <errno.h>
+#include <string.h>
+
+#include <rte_log.h>
+#include <rte_config.h>
+
+#include "guest_channel.h"
+#include "channel_commands.h"
+#include "rte_power_kvm_vm.h"
+#include "rte_power_common.h"
+
+#define FD_PATH "/dev/virtio-ports/virtio.serial.port.poweragent"
+
+static struct channel_packet pkt[CHANNEL_CMDS_MAX_VM_CHANNELS];
+
+
+int
+rte_power_kvm_vm_init(unsigned lcore_id)
+{
+ if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
+ RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
+ lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
+ return -1;
+ }
+ pkt[lcore_id].command = CPU_POWER;
+ pkt[lcore_id].resource_id = lcore_id;
+ return guest_channel_host_connect(FD_PATH, lcore_id);
+}
+
+int
+rte_power_kvm_vm_exit(unsigned lcore_id)
+{
+ guest_channel_host_disconnect(lcore_id);
+ return 0;
+}
+
+uint32_t
+rte_power_kvm_vm_freqs(__attribute__((unused)) unsigned lcore_id,
+ __attribute__((unused)) uint32_t *freqs,
+ __attribute__((unused)) uint32_t num)
+{
+ RTE_LOG(ERR, POWER, "rte_power_freqs is not implemented "
+ "for Virtual Machine Power Management\n");
+ return -ENOTSUP;
+}
+
+uint32_t
+rte_power_kvm_vm_get_freq(__attribute__((unused)) unsigned lcore_id)
+{
+ RTE_LOG(ERR, POWER, "rte_power_get_freq is not implemented "
+ "for Virtual Machine Power Management\n");
+ return -ENOTSUP;
+}
+
+int
+rte_power_kvm_vm_set_freq(__attribute__((unused)) unsigned lcore_id,
+ __attribute__((unused)) uint32_t index)
+{
+ RTE_LOG(ERR, POWER, "rte_power_set_freq is not implemented "
+ "for Virtual Machine Power Management\n");
+ return -ENOTSUP;
+}
+
+static inline int
+send_msg(unsigned lcore_id, uint32_t scale_direction)
+{
+ int ret;
+
+ if (lcore_id >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
+ RTE_LOG(ERR, POWER, "Core(%u) is out of range 0...%d\n",
+ lcore_id, CHANNEL_CMDS_MAX_VM_CHANNELS-1);
+ return -1;
+ }
+ pkt[lcore_id].unit = scale_direction;
+ ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
+ if (ret == 0)
+ return 1;
+ RTE_LOG(DEBUG, POWER, "Error sending message: %s\n", strerror(ret));
+ return -1;
+}
+
+int
+rte_power_kvm_vm_freq_up(unsigned lcore_id)
+{
+ return send_msg(lcore_id, CPU_POWER_SCALE_UP);
+}
+
+int
+rte_power_kvm_vm_freq_down(unsigned lcore_id)
+{
+ return send_msg(lcore_id, CPU_POWER_SCALE_DOWN);
+}
+
+int
+rte_power_kvm_vm_freq_max(unsigned lcore_id)
+{
+ return send_msg(lcore_id, CPU_POWER_SCALE_MAX);
+}
+
+int
+rte_power_kvm_vm_freq_min(unsigned lcore_id)
+{
+ return send_msg(lcore_id, CPU_POWER_SCALE_MIN);
+}
diff --git a/lib/librte_power/rte_power_kvm_vm.h b/lib/librte_power/rte_power_kvm_vm.h
new file mode 100644
index 0000000..dcbc878
--- /dev/null
+++ b/lib/librte_power/rte_power_kvm_vm.h
@@ -0,0 +1,179 @@
+/*-
+ * 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 _RTE_POWER_KVM_VM_H
+#define _RTE_POWER_KVM_VM_H
+
+/**
+ * @file
+ * RTE Power Management KVM VM
+ */
+
+#include <rte_common.h>
+#include <rte_byteorder.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Initialize power management for a specific lcore.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_kvm_vm_init(unsigned lcore_id);
+
+/**
+ * Exit power management on a specific lcore.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_kvm_vm_exit(unsigned lcore_id);
+
+/**
+ * Get the available frequencies of a specific lcore.
+ * It is not currently supported for VM Power Management.
+ *
+ * @param lcore_id
+ * lcore id.
+ * @param freqs
+ * The buffer array to save the frequencies.
+ * @param num
+ * The number of frequencies to get.
+ *
+ * @return
+ * -ENOTSUP
+ */
+uint32_t rte_power_kvm_vm_freqs(unsigned lcore_id, uint32_t *freqs,
+ uint32_t num);
+
+/**
+ * Return the current index of available frequencies of a specific lcore.
+ * It is not currently supported for VM Power Management.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * -ENOTSUP
+ */
+uint32_t rte_power_kvm_vm_get_freq(unsigned lcore_id);
+
+/**
+ * Set the new frequency for a specific lcore by indicating the index of
+ * available frequencies.
+ * It is not currently supported for VM Power Management.
+ *
+ * @param lcore_id
+ * lcore id.
+ * @param index
+ * The index of available frequencies.
+ *
+ * @return
+ * -ENOTSUP
+ */
+int rte_power_kvm_vm_set_freq(unsigned lcore_id, uint32_t index);
+
+/**
+ * Scale up the frequency of a specific lcore. This request is forwarded to the
+ * host monitor.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success.
+ * - Negative on error.
+ */
+int rte_power_kvm_vm_freq_up(unsigned lcore_id);
+
+/**
+ * Scale down the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success.
+ * - Negative on error.
+ */
+int rte_power_kvm_vm_freq_down(unsigned lcore_id);
+
+/**
+ * Scale up the frequency of a specific lcore to the highest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success.
+ * - Negative on error.
+ */
+int rte_power_kvm_vm_freq_max(unsigned lcore_id);
+
+/**
+ * Scale down the frequency of a specific lcore to the lowest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success.
+ * - Negative on error.
+ */
+int rte_power_kvm_vm_freq_min(unsigned lcore_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif