cpufreq: intel_pstate: Fix EPP setting via sysfs in active mode

Because intel_pstate_set_energy_pref_index() reads and writes the
MSR_HWP_REQUEST register without using the cached value of it used by
intel_pstate_hwp_boost_up() and intel_pstate_hwp_boost_down(), those
functions may overwrite the value written by it and so the EPP value
set via sysfs may be lost.

To avoid that, make intel_pstate_set_energy_pref_index() take the
cached value of MSR_HWP_REQUEST just like the other two routines
mentioned above and update it with the new EPP value coming from
user space in addition to updating the MSR.

Note that the MSR itself still needs to be updated too in case
hwp_boost is unset or the boosting mechanism is not active at the
EPP change time.

Fixes: e0efd5be63e8 ("cpufreq: intel_pstate: Add HWP boost utility and sched util hooks")
Reported-by: Francisco Jerez <currojerez@riseup.net>
Cc: 4.18+ <stable@vger.kernel.org> # 4.18+: 3da97d4db8ee cpufreq: intel_pstate: Rearrange ...
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index c55f6e35a1e3ccedca1366e9eab3e39abf0b6cf0..7f5d819314834a9bfebb2f706f389c8e88a5fbd5 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -650,11 +650,12 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
                epp = cpu_data->epp_default;
 
        if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
-               u64 value;
-
-               ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value);
-               if (ret)
-                       return ret;
+               /*
+                * Use the cached HWP Request MSR value, because the register
+                * itself may be updated by intel_pstate_hwp_boost_up() or
+                * intel_pstate_hwp_boost_down() at any time.
+                */
+               u64 value = READ_ONCE(cpu_data->hwp_req_cached);
 
                value &= ~GENMASK_ULL(31, 24);
 
@@ -664,6 +665,12 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
                        epp = epp_values[pref_index - 1];
 
                value |= (u64)epp << 24;
+               /*
+                * The only other updater of hwp_req_cached in the active mode,
+                * intel_pstate_hwp_set(), is called under the same lock as this
+                * function, so it cannot run in parallel with the update below.
+                */
+               WRITE_ONCE(cpu_data->hwp_req_cached, value);
                ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value);
        } else {
                if (epp == -EINVAL)