[v7,1/3] power: add uncore frequency control API to the power library

diff --git a/doc/guides/prog_guide/power_man.rst b/doc/guides/prog_guide/power_man.rst
index 98cfd3c1f3..cf2f5d8b69 100644
--- a/doc/guides/prog_guide/power_man.rst
+++ b/doc/guides/prog_guide/power_man.rst
@@ -276,6 +276,44 @@  API Overview for Ethernet PMD Power Management
 * **Set Scaling Max Freq**: Set the maximum frequency (kHz) to be used in Frequency
   Scaling mode.
 
+Uncore API
+----------
+
+Abstract
+~~~~~~~~
+
+Uncore is a term used by Intel to describe the functions of a microprocessor that are
+not in the core, but which must be closely connected to the core to achieve high performance;
+L3 cache, on-die memory controller, etc.
+Significant power savings can be achieved by reducing the uncore frequency to its lowest value.
+
+The Linux kernel provides the driver “intel-uncore-frequency" to control the uncore frequency limits
+for x86 platform. The driver is available from kernel version 5.6 and above.
+Also CONFIG_INTEL_UNCORE_FREQ_CONTROL will need to be enabled in the kernel, which was added in 5.6.
+This manipulates the contest of MSR 0x620, which sets min/max of the uncore for the SKU.
+
+
+API Overview for Uncore
+~~~~~~~~~~~~~~~~~~~~~~~
+* **Uncore Power Init**: Initialise uncore power, populate frequency array and record
+  original min & max for pkg & die.
+
+* **Uncore Power Exit**: Exit uncore power, restoring original min & max for pkg & die.
+
+* **Get Uncore Power Freq**: Get current uncore freq index for pkg & die.
+
+* **Set Uncore Power Freq**: Set min & max uncore freq index for pkg & die (min and max will be the same).
+
+* **Uncore Power Max**: Set max uncore freq index for pkg & die.
+
+* **Uncore Power Min**: Set min uncore freq index for pkg & die.
+
+* **Get Num Freqs**: Get the number of frequencies in the index array.
+
+* **Get Num Pkgs**: Get the number of packages (CPUs) on the system.
+
+* **Get Num Dies**: Get the number of die's on a given package.
+
 References
 ----------
 
diff --git a/doc/guides/rel_notes/release_22_11.rst b/doc/guides/rel_notes/release_22_11.rst
index cb7677fd3c..5d3f815b54 100644
--- a/doc/guides/rel_notes/release_22_11.rst
+++ b/doc/guides/rel_notes/release_22_11.rst
@@ -75,6 +75,11 @@  New Features
   * Added ``rte_event_eth_tx_adapter_instance_get`` to get Tx adapter
     instance ID for specified ethernet device ID and Tx queue index.
 
+* **Added uncore frequency control API to the power library.**
+
+  Add api to allow uncore frequency adjustment. This is done through
+  manipulating related uncore frequency control sysfs entries to
+  adjust the minimum and maximum uncore frequency values.
 
 Removed Items
 -------------
diff --git a/lib/power/meson.build b/lib/power/meson.build
index ba8d66074b..80cdeb72d4 100644
--- a/lib/power/meson.build
+++ b/lib/power/meson.build
@@ -21,12 +21,14 @@  sources = files(
         'rte_power.c',
         'rte_power_empty_poll.c',
         'rte_power_pmd_mgmt.c',
+        'rte_power_uncore.c',
 )
 headers = files(
         'rte_power.h',
         'rte_power_empty_poll.h',
         'rte_power_pmd_mgmt.h',
         'rte_power_guest_channel.h',
+        'rte_power_uncore.h',
 )
 if cc.has_argument('-Wno-cast-qual')
     cflags += '-Wno-cast-qual'
diff --git a/lib/power/rte_power_uncore.c b/lib/power/rte_power_uncore.c
new file mode 100644
index 0000000000..c9049e2b6c
--- /dev/null
+++ b/lib/power/rte_power_uncore.c
@@ -0,0 +1,451 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Intel Corporation
+ */
+
+#include <errno.h>
+#include <dirent.h>
+#include <fnmatch.h>
+
+#include <rte_memcpy.h>
+
+#include "rte_power_uncore.h"
+#include "power_common.h"
+
+#define MAX_UNCORE_FREQS 32
+#define MAX_NUMA_DIE 8
+#define BUS_FREQ     100000
+#define FILTER_LENGTH 18
+#define PACKAGE_FILTER "package_%02u_die_*"
+#define DIE_FILTER "package_%02u_die_%02u"
+#define UNCORE_FREQUENCY_DIR "/sys/devices/system/cpu/intel_uncore_frequency"
+#define POWER_GOVERNOR_PERF "performance"
+#define POWER_UNCORE_SYSFILE_MAX_FREQ \
+		"/sys/devices/system/cpu/intel_uncore_frequency/package_%02u_die_%02u/max_freq_khz"
+#define POWER_UNCORE_SYSFILE_MIN_FREQ  \
+		"/sys/devices/system/cpu/intel_uncore_frequency/package_%02u_die_%02u/min_freq_khz"
+#define POWER_UNCORE_SYSFILE_BASE_MAX_FREQ \
+		"/sys/devices/system/cpu/intel_uncore_frequency/package_%02u_die_%02u/initial_max_freq_khz"
+#define POWER_UNCORE_SYSFILE_BASE_MIN_FREQ  \
+		"/sys/devices/system/cpu/intel_uncore_frequency/package_%02u_die_%02u/initial_min_freq_khz"
+
+
+struct uncore_power_info {
+	unsigned int die;                    /** Core die id */
+	unsigned int pkg;                    /** Package id */
+	uint32_t freqs[MAX_UNCORE_FREQS];/** Frequency array */
+	uint32_t nb_freqs;                   /** Number of available freqs */
+	FILE *f_cur_min;                     /** FD of scaling_min */
+	FILE *f_cur_max;                     /** FD of scaling_max */
+	uint32_t curr_idx;                   /** Freq index in freqs array */
+	uint32_t org_min_freq;               /** Original min freq of uncore */
+	uint32_t org_max_freq;               /** Original max freq of uncore */
+	uint32_t init_max_freq;              /** System max uncore freq */
+	uint32_t init_min_freq;              /** System min uncore freq */
+} __rte_cache_aligned;
+
+static struct uncore_power_info uncore_info[RTE_MAX_NUMA_NODES][MAX_NUMA_DIE];
+
+static int
+set_uncore_freq_internal(struct uncore_power_info *ui, uint32_t idx)
+{
+	uint32_t target_uncore_freq, curr_max_freq;
+	int ret;
+
+	if (idx >= MAX_UNCORE_FREQS || idx >= ui->nb_freqs) {
+		RTE_LOG(DEBUG, POWER, "Invalid uncore frequency index %u, which "
+				"should be less than %u\n", idx, ui->nb_freqs);
+		return -1;
+	}
+
+	target_uncore_freq = ui->freqs[idx];
+
+	/* check current max freq, so that the value to be flushed first
+	 * can be accurately recorded
+	 */
+	open_core_sysfs_file(&ui->f_cur_max, "rw+", POWER_UNCORE_SYSFILE_MAX_FREQ,
+			ui->pkg, ui->die);
+	if (ui->f_cur_max == NULL) {
+		RTE_LOG(DEBUG, POWER, "failed to open %s\n",
+				POWER_UNCORE_SYSFILE_MAX_FREQ);
+		return -1;
+	}
+	ret = read_core_sysfs_u32(ui->f_cur_max, &curr_max_freq);
+	if (ret < 0) {
+		RTE_LOG(DEBUG, POWER, "Failed to read %s\n",
+				POWER_UNCORE_SYSFILE_MAX_FREQ);
+		fclose(ui->f_cur_max);
+		return -1;
+	}
+
+	/* check this value first before fprintf value to f_cur_max, so value isn't overwritten */
+	if (fprintf(ui->f_cur_min, "%u", target_uncore_freq) < 0) {
+		RTE_LOG(ERR, POWER, "Fail to write new uncore frequency for "
+				"pkg %02u die %02u\n", ui->pkg, ui->die);
+		return -1;
+	}
+
+	if (fprintf(ui->f_cur_max, "%u", target_uncore_freq) < 0) {
+		RTE_LOG(ERR, POWER, "Fail to write new uncore frequency for "
+				"pkg %02u die %02u\n", ui->pkg, ui->die);
+		return -1;
+	}
+
+	POWER_DEBUG_TRACE("Uncore frequency '%u' to be set for pkg %02u die %02u\n",
+				target_uncore_freq, ui->pkg, ui->die);
+
+
+	/* write the minimum value first if the target freq is less than current max */
+	if (target_uncore_freq <= curr_max_freq) {
+		fflush(ui->f_cur_min);
+		fflush(ui->f_cur_max);
+	} else {
+		fflush(ui->f_cur_max);
+		fflush(ui->f_cur_min);
+	}
+	ui->curr_idx = idx;
+
+	return 0;
+}
+
+/**
+ * Fopen the sys file for the future setting of the uncore die frequency.
+ */
+static int
+power_init_for_setting_uncore_freq(struct uncore_power_info *ui)
+{
+	FILE *f_base_min = NULL, *f_base_max = NULL, *f_min = NULL, *f_max = NULL;
+	uint32_t base_min_freq = 0, base_max_freq = 0, min_freq = 0, max_freq = 0;
+	int ret;
+
+	/* open and read all uncore sys files */
+	/* Base max */
+	open_core_sysfs_file(&f_base_max, "r", POWER_UNCORE_SYSFILE_BASE_MAX_FREQ,
+			ui->pkg, ui->die);
+	if (f_base_max == NULL) {
+		RTE_LOG(DEBUG, POWER, "failed to open %s\n",
+				POWER_UNCORE_SYSFILE_BASE_MAX_FREQ);
+		goto err;
+	}
+	ret = read_core_sysfs_u32(f_base_max, &base_max_freq);
+	if (ret < 0) {
+		RTE_LOG(DEBUG, POWER, "Failed to read %s\n",
+				POWER_UNCORE_SYSFILE_BASE_MAX_FREQ);
+		goto err;
+	}
+
+	/* Base min */
+	open_core_sysfs_file(&f_base_min, "r", POWER_UNCORE_SYSFILE_BASE_MIN_FREQ,
+		ui->pkg, ui->die);
+	if (f_base_min == NULL) {
+		RTE_LOG(DEBUG, POWER, "failed to open %s\n",
+				POWER_UNCORE_SYSFILE_BASE_MIN_FREQ);
+		goto err;
+	}
+	if (f_base_min != NULL) {
+		ret = read_core_sysfs_u32(f_base_min, &base_min_freq);
+		if (ret < 0) {
+			RTE_LOG(DEBUG, POWER, "Failed to read %s\n",
+					POWER_UNCORE_SYSFILE_BASE_MIN_FREQ);
+			goto err;
+		}
+	}
+
+	/* Curr min */
+	open_core_sysfs_file(&f_min, "rw+", POWER_UNCORE_SYSFILE_MIN_FREQ,
+			ui->pkg, ui->die);
+	if (f_min == NULL) {
+		RTE_LOG(DEBUG, POWER, "failed to open %s\n",
+				POWER_UNCORE_SYSFILE_MIN_FREQ);
+		goto err;
+	}
+	if (f_min != NULL) {
+		ret = read_core_sysfs_u32(f_min, &min_freq);
+		if (ret < 0) {
+			RTE_LOG(DEBUG, POWER, "Failed to read %s\n",
+					POWER_UNCORE_SYSFILE_MIN_FREQ);
+			goto err;
+		}
+	}
+
+	/* Curr max */
+	open_core_sysfs_file(&f_max, "rw+", POWER_UNCORE_SYSFILE_MAX_FREQ,
+			ui->pkg, ui->die);
+	if (f_max == NULL) {
+		RTE_LOG(DEBUG, POWER, "failed to open %s\n",
+				POWER_UNCORE_SYSFILE_MAX_FREQ);
+		goto err;
+	}
+	if (f_max != NULL) {
+		ret = read_core_sysfs_u32(f_max, &max_freq);
+		if (ret < 0) {
+			RTE_LOG(DEBUG, POWER, "Failed to read %s\n",
+					POWER_UNCORE_SYSFILE_MAX_FREQ);
+			goto err;
+		}
+	}
+
+	/* assign file handles */
+	ui->f_cur_min = f_min;
+	ui->f_cur_max = f_max;
+	/* save current min + max freq's so that they can be restored on exit */
+	ui->org_min_freq = min_freq;
+	ui->org_max_freq = max_freq;
+	ui->init_max_freq = base_max_freq;
+	ui->init_min_freq = base_min_freq;
+
+	return 0;
+
+err:
+	if (f_base_min != NULL)
+		fclose(f_base_min);
+	if (f_base_max != NULL)
+		fclose(f_base_max);
+	if (f_min != NULL)
+		fclose(f_min);
+	if (f_max != NULL)
+		fclose(f_max);
+	return -1;
+}
+
+/**
+ * Get the available uncore frequencies of the specific die by reading the
+ * sys file.
+ */
+static int
+power_get_available_uncore_freqs(struct uncore_power_info *ui)
+{
+	int ret = -1;
+	uint32_t i, num_uncore_freqs = 0;
+
+	num_uncore_freqs = (ui->init_max_freq - ui->init_min_freq) / BUS_FREQ + 1;
+	if (num_uncore_freqs >= MAX_UNCORE_FREQS) {
+		RTE_LOG(ERR, POWER, "Too many available uncore frequencies: %d\n",
+				num_uncore_freqs);
+		goto out;
+	}
+
+	/* Generate the uncore freq bucket array. */
+	for (i = 0; i < num_uncore_freqs; i++)
+		ui->freqs[i] = ui->init_max_freq - (i) * BUS_FREQ;
+
+	ui->nb_freqs = num_uncore_freqs;
+
+	ret = 0;
+
+	POWER_DEBUG_TRACE("%d frequency(s) of pkg %02u die %02u are available\n",
+			num_uncore_freqs, ui->pkg, ui->die);
+
+out:
+	return ret;
+}
+
+static int
+check_pkg_die_values(unsigned int pkg, unsigned int die)
+{
+	unsigned int max_pkgs, max_dies;
+	max_pkgs = rte_power_uncore_get_num_pkgs();
+	if (max_pkgs == 0)
+		return -1;
+	if (pkg >= max_pkgs) {
+		RTE_LOG(DEBUG, POWER, "Package number %02u can not exceed %u\n",
+				pkg, max_pkgs);
+		return -1;
+	}
+
+	max_dies = rte_power_uncore_get_num_dies(pkg);
+	if (max_dies == 0)
+		return -1;
+	if (die >= max_dies) {
+		RTE_LOG(DEBUG, POWER, "Die number %02u can not exceed %u\n",
+				die, max_dies);
+		return -1;
+	}
+
+	return 0;
+}
+
+int
+rte_power_uncore_init(unsigned int pkg, unsigned int die)
+{
+	struct uncore_power_info *ui;
+
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	ui = &uncore_info[pkg][die];
+	ui->die = die;
+	ui->pkg = pkg;
+
+	/* Init for setting uncore die frequency */
+	if (power_init_for_setting_uncore_freq(ui) < 0) {
+		RTE_LOG(DEBUG, POWER, "Cannot init for setting uncore frequency for "
+				"pkg %02u die %02u\n", pkg, die);
+		return -1;
+	}
+
+	/* Get the available frequencies */
+	if (power_get_available_uncore_freqs(ui) < 0) {
+		RTE_LOG(DEBUG, POWER, "Cannot get available uncore frequencies of "
+				"pkg %02u die %02u\n", pkg, die);
+		return -1;
+	}
+
+	return 0;
+}
+
+int
+rte_power_uncore_exit(unsigned int pkg, unsigned int die)
+{
+	struct uncore_power_info *ui;
+
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	ui = &uncore_info[pkg][die];
+
+	if (fprintf(ui->f_cur_min, "%u", ui->org_min_freq) < 0) {
+		RTE_LOG(ERR, POWER, "Fail to write original uncore frequency for "
+				"pkg %02u die %02u\n", ui->pkg, ui->die);
+		return -1;
+	}
+
+	if (fprintf(ui->f_cur_max, "%u", ui->org_max_freq) < 0) {
+		RTE_LOG(ERR, POWER, "Fail to write original uncore frequency for "
+				"pkg %02u die %02u\n", ui->pkg, ui->die);
+		return -1;
+	}
+
+	fflush(ui->f_cur_min);
+	fflush(ui->f_cur_max);
+
+	/* Close FD of setting freq */
+	fclose(ui->f_cur_min);
+	fclose(ui->f_cur_max);
+	ui->f_cur_min = NULL;
+	ui->f_cur_max = NULL;
+
+	return 0;
+}
+
+uint32_t
+rte_power_get_uncore_freq(unsigned int pkg, unsigned int die)
+{
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	return uncore_info[pkg][die].curr_idx;
+}
+
+int
+rte_power_set_uncore_freq(unsigned int pkg, unsigned int die, uint32_t index)
+{
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	return set_uncore_freq_internal(&(uncore_info[pkg][die]), index);
+}
+
+int
+rte_power_uncore_freq_max(unsigned int pkg, unsigned int die)
+{
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	return set_uncore_freq_internal(&(uncore_info[pkg][die]), 0);
+}
+
+
+int
+rte_power_uncore_freq_min(unsigned int pkg, unsigned int die)
+{
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	struct uncore_power_info *ui = &uncore_info[pkg][die];
+
+	return set_uncore_freq_internal(&(uncore_info[pkg][die]), ui->nb_freqs - 1);
+}
+
+int
+rte_power_uncore_get_num_freqs(unsigned int pkg, unsigned int die)
+{
+	int ret = check_pkg_die_values(pkg, die);
+	if (ret < 0)
+		return -1;
+
+	return uncore_info[pkg][die].nb_freqs;
+}
+
+unsigned int
+rte_power_uncore_get_num_pkgs(void)
+{
+	DIR *d;
+	struct dirent *dir;
+	unsigned int count = 0;
+	char filter[FILTER_LENGTH];
+
+	d = opendir(UNCORE_FREQUENCY_DIR);
+	if (d == NULL) {
+		RTE_LOG(ERR, POWER,
+		"Uncore frequency management not supported/enabled on this kernel. "
+		"Please enable CONFIG_INTEL_UNCORE_FREQ_CONTROL if on x86 with linux kernel"
+		" >= 5.6\n");
+		return 0;
+	}
+
+	/* search by incrementing file name for max pkg file value */
+	while ((dir = readdir(d)) != NULL) {
+		snprintf(filter, FILTER_LENGTH, PACKAGE_FILTER, count);
+		/* make sure filter string is in file name (don't include hidden files) */
+		if (fnmatch(filter, dir->d_name, 0) == 0)
+			count++;
+	}
+
+	closedir(d);
+
+	return count;
+}
+
+unsigned int
+rte_power_uncore_get_num_dies(unsigned int pkg)
+{
+	DIR *d;
+	struct dirent *dir;
+	unsigned int count = 0, max_pkgs;
+	char filter[FILTER_LENGTH];
+
+	max_pkgs = rte_power_uncore_get_num_pkgs();
+	if (max_pkgs == 0)
+		return 0;
+	if (pkg >= max_pkgs) {
+		RTE_LOG(DEBUG, POWER, "Invalid package number\n");
+		return 0;
+	}
+
+	d = opendir(UNCORE_FREQUENCY_DIR);
+	if (d == NULL) {
+		RTE_LOG(ERR, POWER,
+		"Uncore frequency management not supported/enabled on this kernel. "
+		"Please enable CONFIG_INTEL_UNCORE_FREQ_CONTROL if on x86 with linux kernel"
+		" >= 5.6\n");
+		return 0;
+	}
+
+	/* search by incrementing file name for max die file value */
+	while ((dir = readdir(d)) != NULL) {
+		snprintf(filter, FILTER_LENGTH, DIE_FILTER, pkg, count);
+		/* make sure filter string is in file name (don't include hidden files) */
+		if (fnmatch(filter, dir->d_name, 0) == 0)
+			count++;
+	}
+
+	closedir(d);
+
+	return count;
+}
diff --git a/lib/power/rte_power_uncore.h b/lib/power/rte_power_uncore.h
new file mode 100644
index 0000000000..2be6546f49
--- /dev/null
+++ b/lib/power/rte_power_uncore.h
@@ -0,0 +1,194 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Intel Corporation
+ */
+
+#ifndef _RTE_POWER_UNCORE_H
+#define _RTE_POWER_UNCORE_H
+
+/**
+ * @file
+ * RTE Uncore Frequency Management
+ */
+
+#include "rte_power.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Initialize uncore frequency management for specific die on a package. It will get the available
+ * frequencies and prepare to set new die frequencies.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+__rte_experimental
+int
+rte_power_uncore_init(unsigned int pkg, unsigned int die);
+
+/**
+ * Exit uncore frequency management on a specific die on a package. It will restore uncore min and
+ * max values to previous values before initialization of API.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+__rte_experimental
+int
+rte_power_uncore_exit(unsigned int pkg, unsigned int die);
+
+/**
+ * Return the current index of available frequencies of a specific die on a package.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ *
+ * @return
+ *  The current index of available frequencies.
+ *  If error, it will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)'.
+ */
+__rte_experimental
+uint32_t
+rte_power_get_uncore_freq(unsigned int pkg, unsigned int die);
+
+/**
+ * Set the new frequency for a specific die on a package by indicating the index of
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ * @param index
+ *  The index of available frequencies.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency changed.
+ *  - Negative on error.
+ */
+__rte_experimental
+int
+rte_power_set_uncore_freq(unsigned int pkg, unsigned int die, uint32_t index);
+
+/**
+ * Scale up the frequency of a specific die on a package to the highest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency changed.
+ *  - Negative on error.
+ */
+__rte_experimental
+int
+rte_power_uncore_freq_max(unsigned int pkg, unsigned int die);
+
+/**
+ * Scale down the frequency of a specific die on a package to the lowest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency changed.
+ *  - Negative on error.
+ */
+__rte_experimental
+int
+rte_power_uncore_freq_min(unsigned int pkg, unsigned int die);
+
+/**
+ * Return the list length of available frequencies in the index array.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ * @param die
+ *  Die number.
+ *
+ * @return
+ *  - The number of available index's in frequency array.
+ *  - Negative on error.
+ */
+__rte_experimental
+int
+rte_power_uncore_get_num_freqs(unsigned int pkg, unsigned int die);
+
+/**
+ * Return the number of packages (CPUs) on a system by parsing the uncore
+ * sysfs directory.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @return
+ *  - Zero on error.
+ *  - Number of package on system on success.
+ */
+__rte_experimental
+unsigned int
+rte_power_uncore_get_num_pkgs(void);
+
+/**
+ * Return the number of dies for pakckages (CPUs) specified from parsing
+ * the uncore sysfs directory.
+ *
+ * This function should NOT be called in the fast path.
+ *
+ * @param pkg
+ *  Package number.
+ *
+ * @return
+ *  - Zero on error.
+ *  - Number of dies for package on sucecss.
+ */
+__rte_experimental
+unsigned int
+rte_power_uncore_get_num_dies(unsigned int pkg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/power/version.map b/lib/power/version.map
index f9b2947adf..8fccbf20f7 100644
--- a/lib/power/version.map
+++ b/lib/power/version.map
@@ -48,4 +48,15 @@  EXPERIMENTAL {
 	rte_power_pmd_mgmt_set_pause_duration;
 	rte_power_pmd_mgmt_set_scaling_freq_max;
 	rte_power_pmd_mgmt_set_scaling_freq_min;
+
+	# added in 22.11
+	rte_power_get_uncore_freq;
+	rte_power_set_uncore_freq;
+	rte_power_uncore_exit;
+	rte_power_uncore_freq_max;
+	rte_power_uncore_freq_min;
+	rte_power_uncore_get_num_dies;
+	rte_power_uncore_get_num_freqs;
+	rte_power_uncore_get_num_pkgs;
+	rte_power_uncore_init;
 };