From: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com

commit 03c83982a0278207709143ba78c5a470179febee upstream.

On systems with overclocking enabled, CPPC Highest Performance can be hard coded to 0xff. In this case even if we have cores with different highest performance, ITMT can't be enabled as the current implementation depends on CPPC Highest Performance.

On such systems we can use MSR_HWP_CAPABILITIES maximum performance field when CPPC.Highest Performance is 0xff.

Due to legacy reasons, we can't solely depend on MSR_HWP_CAPABILITIES as in some older systems CPPC Highest Performance is the only way to identify different performing cores.

Reported-by: Michael Larabel Michael@MichaelLarabel.com Signed-off-by: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com Tested-by: Michael Larabel Michael@MichaelLarabel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Dimitri John Ledkov dimitri.ledkov@canonical.com --- drivers/cpufreq/intel_pstate.c | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index e15c3bc17a55..8a2c6b58b652 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -335,6 +335,8 @@ static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)

static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);

+#define CPPC_MAX_PERF U8_MAX + static void intel_pstate_set_itmt_prio(int cpu) { struct cppc_perf_caps cppc_perf; @@ -345,6 +347,14 @@ static void intel_pstate_set_itmt_prio(int cpu) if (ret) return;

+ /* + * On some systems with overclocking enabled, CPPC.highest_perf is hardcoded to 0xff. + * In this case we can't use CPPC.highest_perf to enable ITMT. + * In this case we can look at MSR_HWP_CAPABILITIES bits [8:0] to decide. + */ + if (cppc_perf.highest_perf == CPPC_MAX_PERF) + cppc_perf.highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached)); + /* * The priorities can be set regardless of whether or not * sched_set_itmt_support(true) has been called and it is valid to