[PATCH v5 2/9] cpufreq: intel_pstate: Avoid SMP calls to get cpu-type

[Pawan Gupta]

Intel pstate driver relies on SMP calls to get the cpu-type of a given CPU.
Remove the SMP calls and instead use the cached value of cpu-type which is
more efficient.

Suggested-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>
---
 drivers/cpufreq/intel_pstate.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index b8e2396a708a..c767680daa03 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2202,24 +2202,17 @@ static int knl_get_turbo_pstate(int cpu)
 	return ret;
 }
 
-static void hybrid_get_type(void *data)
-{
-	u8 *cpu_type = data;
-
-	*cpu_type = get_this_hybrid_cpu_type();
-}
-
 static int hwp_get_cpu_scaling(int cpu)
 {
-	u8 cpu_type = 0;
+	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
+	u8 cpu_type = c->topo.intel_type;
 
-	smp_call_function_single(cpu, hybrid_get_type, &cpu_type, 1);
 	/* P-cores have a smaller perf level-to-freqency scaling factor. */
-	if (cpu_type == 0x40)
+	if (cpu_type == INTEL_CPU_TYPE_CORE)
 		return hybrid_scaling_factor;
 
 	/* Use default core scaling for E-cores */
-	if (cpu_type == 0x20)
+	if (cpu_type == INTEL_CPU_TYPE_ATOM)
 		return core_get_scaling();
 
 	/*

-- 
2.34.1