[DPDK/core Bug 1499] Intel uncore power library fails because of too many frequencies

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1499

            Bug ID: 1499
           Summary: Intel uncore power library fails because of too many
                    frequencies
           Product: DPDK
           Version: 24.07
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: stephen@networkplumber.org
  Target Milestone: ---

Running 24.07-rc2 on Intel core box fails the power uncore test because:

RTE>>power_intel_uncore_autotest
POWER: Too many available uncore frequencies: 33
POWER: Cannot get available uncore frequencies of pkg 00 die 00
Cannot initialise uncore power management for pkg 0 die 0, this may occur if
environment is not configured correctly(APCI cpufreq) or operating in another
valid Power management environment


The CPU is: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
initial_max_freq_khz:3600000
initial_min_freq_khz:400000
max_freq_khz:3600000
min_freq_khz:400000

Which leads to this expression:
        num_uncore_freqs = (ui->init_max_freq - ui->init_min_freq) / BUS_FREQ +
1;
        if (num_uncore_freqs >= MAX_UNCORE_FREQS) {
                POWER_LOG(ERR, "Too many available uncore frequencies: %d",
                                num_uncore_freqs);

I.e:
        num_uncore_freqs = (3600000 - 400000) / 100000 + 1
                         = 33

Looks like an off-by-one error, was this ever tested?

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