--- /dev/null
+/*-
+ * 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);
+}
Code Review / deb_dpdk.git / blobdiff