cpufreq: intel_pstate: Avoid SMP calls to get cpu-type

JIRA: https://issues.redhat.com/browse/RHEL-85517

commit b52aaee
Author: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Date:   Wed Dec 11 22:57:30 2024 -0800

    cpufreq: intel_pstate: Avoid SMP calls to get cpu-type

    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.

    [ mingo: Forward ported it. ]

    Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
    Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
    Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
    Link: https://lore.kernel.org/r/20241211-add-cpu-type-v5-2-2ae010f50370@linux.intel.com

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

drivers/cpufreq/intel_pstate.c

@@ -2206,28 +2206,20 @@ 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)
 {
 	if (hybrid_scaling_factor) {
-		u8 cpu_type = 0;
-
-		smp_call_function_single(cpu, hybrid_get_type, &cpu_type, 1);
+		struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
+		u8 cpu_type = c->topo.intel_type;
 
 		/*
 		 * Return the hybrid scaling factor for P-cores and use the
 		 * default core scaling for E-cores.
 		 */
-		if (cpu_type == 0x40)
+		if (cpu_type == INTEL_CPU_TYPE_CORE)
 			return hybrid_scaling_factor;
 
-		if (cpu_type == 0x20)
+		if (cpu_type == INTEL_CPU_TYPE_ATOM)
 			return core_get_scaling();
 	}