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From c9f82c4d609a59b1cf15981bf096ccc448290d8b Mon Sep 17 00:00:00 2001
From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Thu, 18 Nov 2021 21:18:01 -0800
Subject: [PATCH 5/8] cpufreq: intel_pstate: ITMT support for overclocked
system
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>
---
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 dafa631582ba..7307b3c4a4c4 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
--
2.34.1
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