From: Chen Yu yu.c.chen@intel.com
commit 6f67e060083a84a4cc364eab6ae40c717165fb0c upstream.
Currently, when turbo is disabled (either by BIOS or by the user), the intel_pstate driver reads the max non-turbo frequency from the package-wide MSR_PLATFORM_INFO(0xce) register.
However, on asymmetric platforms it is possible in theory that small and big core with HWP enabled might have different max non-turbo CPU frequency, because MSR_HWP_CAPABILITIES is per-CPU scope according to Intel Software Developer Manual.
The turbo max freq is already per-CPU in current code, so make similar change to the max non-turbo frequency as well.
Reported-by: Wendy Wang wendy.wang@intel.com Signed-off-by: Chen Yu yu.c.chen@intel.com [ rjw: Subject and changelog edits ] Cc: 4.18+ stable@vger.kernel.org # 4.18+: a45ee4d4e13b: cpufreq: intel_pstate: Change intel_pstate_get_hwp_max() argument Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpufreq/intel_pstate.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1566,11 +1566,9 @@ static void intel_pstate_max_within_limi static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) { cpu->pstate.min_pstate = pstate_funcs.get_min(); - cpu->pstate.max_pstate = pstate_funcs.get_max(); cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical(); cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); cpu->pstate.scaling = pstate_funcs.get_scaling(); - cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
if (hwp_active && !hwp_mode_bdw) { unsigned int phy_max, current_max; @@ -1578,9 +1576,12 @@ static void intel_pstate_get_cpu_pstates intel_pstate_get_hwp_max(cpu->cpu, &phy_max, ¤t_max); cpu->pstate.turbo_freq = phy_max * cpu->pstate.scaling; cpu->pstate.turbo_pstate = phy_max; + cpu->pstate.max_pstate = HWP_GUARANTEED_PERF(READ_ONCE(cpu->hwp_cap_cached)); } else { cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling; + cpu->pstate.max_pstate = pstate_funcs.get_max(); } + cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
if (pstate_funcs.get_aperf_mperf_shift) cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();