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authorChen Yu <yu.c.chen@intel.com>2021-01-12 08:21:27 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-01-12 21:44:49 +0300
commit6f67e060083a84a4cc364eab6ae40c717165fb0c (patch)
tree031978b05159489fd6609d7d1ab6673b593b6289 /drivers/cpufreq
parent597ffbc8d085870e071807b514a6ed45809f81a5 (diff)
downloadlinux-6f67e060083a84a4cc364eab6ae40c717165fb0c.tar.xz
cpufreq: intel_pstate: Get per-CPU max freq via MSR_HWP_CAPABILITIES if available
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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/intel_pstate.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 86873f4c6a72..6f2ff2775664 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1714,11 +1714,9 @@ static void intel_pstate_max_within_limits(struct cpudata *cpu)
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;
@@ -1726,9 +1724,12 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
intel_pstate_get_hwp_max(cpu, &phy_max, &current_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();