[src/trunk]: src/sys/arch/arm/apple Make the scheduler aware of the differenc...

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

details:   https://anonhg.NetBSD.org/src/rev/da3509d7aec3
branches:  trunk
changeset: 1023292:da3509d7aec3
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Sep 01 23:05:03 2021 +0000

description:
Make the scheduler aware of the differences between efficiency and
performance cores.

diffstat:

 sys/arch/arm/apple/apple_platform.c |  29 +++++++++++++++++++++++++++--
 1 files changed, 27 insertions(+), 2 deletions(-)

diffs (57 lines):

diff -r 587594e7dde8 -r da3509d7aec3 sys/arch/arm/apple/apple_platform.c
--- a/sys/arch/arm/apple/apple_platform.c       Wed Sep 01 22:44:50 2021 +0000
+++ b/sys/arch/arm/apple/apple_platform.c       Wed Sep 01 23:05:03 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: apple_platform.c,v 1.1 2021/08/30 23:26:26 jmcneill Exp $ */
+/* $NetBSD: apple_platform.c,v 1.2 2021/09/01 23:05:03 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2021 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: apple_platform.c,v 1.1 2021/08/30 23:26:26 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: apple_platform.c,v 1.2 2021/09/01 23:05:03 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -58,6 +58,18 @@
 
 #include <arch/evbarm/fdt/platform.h>
 
+/*
+ * Faux DMIPS/MHz values for known CPU types. The values themselves are
+ * unimportant except as relative comparisons between different CPUs on
+ * the same system.
+ */
+static const struct device_compatible_entry cpu_capacity_compat_data[] = {
+       /* Apple M1 */
+       { .compat = "apple,icestorm",   .value = 0 },   /* efficiency core */
+       { .compat = "apple,firestorm",  .value = 1 },   /* performance core */
+       DEVICE_COMPAT_EOL
+};
+
 extern struct bus_space arm_generic_bs_tag;
 
 struct arm32_bus_dma_tag apple_coherent_dma_tag;
@@ -184,6 +196,19 @@
        uint8_t eaddr[ETHER_ADDR_LEN];
        int len;
 
+       if (device_is_a(self, "cpu")) {
+               struct fdt_attach_args * const faa = aux;
+               const int phandle = faa->faa_phandle;
+               const struct device_compatible_entry *dce;
+
+               dce = of_compatible_lookup(phandle, cpu_capacity_compat_data);
+               if (dce != NULL) {
+                       prop_dictionary_set_uint32(prop, "capacity_dmips_mhz",
+                           dce->value);
+               }
+               return;
+       }
+
        if (device_is_a(self, "bge") &&
            device_is_a(device_parent(self), "pci")) {
                struct pci_attach_args * const pa = aux;