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34 #ifndef _RTE_POWER_ACPI_CPUFREQ_H
35 #define _RTE_POWER_ACPI_CPUFREQ_H
39 * RTE Power Management via userspace ACPI cpufreq
42 #include <rte_common.h>
43 #include <rte_byteorder.h>
45 #include <rte_string_fns.h>
52 * Initialize power management for a specific lcore. It will check and set the
53 * governor to userspace for the lcore, get the available frequencies, and
54 * prepare to set new lcore frequency.
61 * - Negative on error.
63 int rte_power_acpi_cpufreq_init(unsigned lcore_id);
66 * Exit power management on a specific lcore. It will set the governor to which
67 * is before initialized.
74 * - Negative on error.
76 int rte_power_acpi_cpufreq_exit(unsigned lcore_id);
79 * Get the available frequencies of a specific lcore. The return value will be
80 * the minimal one of the total number of available frequencies and the number
81 * of buffer. The index of available frequencies used in other interfaces
82 * should be in the range of 0 to this return value.
83 * It should be protected outside of this function for threadsafe.
88 * The buffer array to save the frequencies.
90 * The number of frequencies to get.
93 * The number of available frequencies.
95 uint32_t rte_power_acpi_cpufreq_freqs(unsigned lcore_id, uint32_t *freqs,
99 * Return the current index of available frequencies of a specific lcore. It
100 * will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)' if error.
101 * It should be protected outside of this function for threadsafe.
107 * The current index of available frequencies.
109 uint32_t rte_power_acpi_cpufreq_get_freq(unsigned lcore_id);
112 * Set the new frequency for a specific lcore by indicating the index of
113 * available frequencies.
114 * It should be protected outside of this function for threadsafe.
119 * The index of available frequencies.
122 * - 1 on success with frequency changed.
123 * - 0 on success without frequency changed.
124 * - Negative on error.
126 int rte_power_acpi_cpufreq_set_freq(unsigned lcore_id, uint32_t index);
129 * Scale up the frequency of a specific lcore according to the available
131 * It should be protected outside of this function for threadsafe.
137 * - 1 on success with frequency changed.
138 * - 0 on success without frequency changed.
139 * - Negative on error.
141 int rte_power_acpi_cpufreq_freq_up(unsigned lcore_id);
144 * Scale down the frequency of a specific lcore according to the available
146 * It should be protected outside of this function for threadsafe.
152 * - 1 on success with frequency changed.
153 * - 0 on success without frequency changed.
154 * - Negative on error.
156 int rte_power_acpi_cpufreq_freq_down(unsigned lcore_id);
159 * Scale up the frequency of a specific lcore to the highest according to the
160 * available frequencies.
161 * It should be protected outside of this function for threadsafe.
167 * - 1 on success with frequency changed.
168 * - 0 on success without frequency changed.
169 * - Negative on error.
171 int rte_power_acpi_cpufreq_freq_max(unsigned lcore_id);
174 * Scale down the frequency of a specific lcore to the lowest according to the
175 * available frequencies.
176 * It should be protected outside of this function for threadsafe.
182 * - 1 on success with frequency changed.
183 * - 0 on success without frequency chnaged.
184 * - Negative on error.
186 int rte_power_acpi_cpufreq_freq_min(unsigned lcore_id);