Commit b52aaeea authored by Pawan Gupta's avatar Pawan Gupta Committed by Ingo Molnar
Browse files

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: default avatarDave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: default avatarPawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20241211-add-cpu-type-v5-2-2ae010f50370@linux.intel.com
parent 4a412c70

drivers/cpufreq/intel_pstate.c

+4 −12
Original line number Diff line number Diff line
@@ -2200,28 +2200,20 @@ 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();

	}