-
-#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)