[src/trunk]: src/sys/arch/arm/acpi arm64: acpi: Set capacity_dmips_mhz for CPUs

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c84a3e929e30
branches:  trunk
changeset: 1026421:c84a3e929e30
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Nov 24 10:01:24 2021 +0000

description:
arm64: acpi: Set capacity_dmips_mhz for CPUs

The GICC structure describes a relative power efficiency for each
processor. Use this value as-is for the capacity_dmips_mhz value of a
cpu. This makes the assumption that "more efficient" means "slower".

diffstat:

 sys/arch/arm/acpi/cpu_acpi.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r 74363530bd4b -r c84a3e929e30 sys/arch/arm/acpi/cpu_acpi.c
--- a/sys/arch/arm/acpi/cpu_acpi.c      Wed Nov 24 02:01:15 2021 +0000
+++ b/sys/arch/arm/acpi/cpu_acpi.c      Wed Nov 24 10:01:24 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu_acpi.c,v 1.11 2021/10/17 12:41:05 jmcneill Exp $ */
+/* $NetBSD: cpu_acpi.c,v 1.12 2021/11/24 10:01:24 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -33,7 +33,7 @@
 #include "opt_multiprocessor.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu_acpi.c,v 1.11 2021/10/17 12:41:05 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu_acpi.c,v 1.12 2021/11/24 10:01:24 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -93,6 +93,7 @@
 static void
 cpu_acpi_attach(device_t parent, device_t self, void *aux)
 {
+       prop_dictionary_t dict = device_properties(self);
        ACPI_MADT_GENERIC_INTERRUPT *gicc = aux;
        const uint64_t mpidr = gicc->ArmMpidr;
        const int unit = device_unit(self);
@@ -123,6 +124,10 @@
        }
 #endif /* MULTIPROCESSOR */
 
+       /* Assume that less efficient processors are faster. */
+       prop_dictionary_set_uint32(dict, "capacity_dmips_mhz",
+           gicc->EfficiencyClass);
+
        /* Store the ACPI Processor UID in cpu_info */
        ci->ci_acpiid = gicc->Uid;