[PATCH 5.11 730/775] cpufreq: intel_pstate: Get per-CPU max freq via MSR_HWP_CAPABILITIES if available

[Greg Kroah-Hartman]

From: Chen Yu <yu.c.c...@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.w...@intel.com>
Signed-off-by: Chen Yu <yu.c.c...@intel.com>
[ rjw: Subject and changelog edits ]
Cc: 4.18+ <sta...@vger.kernel.org> # 4.18+: a45ee4d4e13b: cpufreq: 
intel_pstate: Change intel_pstate_get_hwp_max() argument
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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
@@ -1714,11 +1714,9 @@ 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;
@@ -1726,9 +1724,12 @@ static void intel_pstate_get_cpu_pstates
                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();