Author: andrew
Date: Mon Jul 25 15:57:13 2016
New Revision: 303307
URL: https://svnweb.freebsd.org/changeset/base/303307
Log:
Rework how we number CPUs on arm64 to try and keep clusters together.
Obtained from: ABT Systems Ltd
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/arm64/arm64/mp_machdep.c
Modified: head/sys/arm64/arm64/mp_machdep.c
==============================================================================
--- head/sys/arm64/arm64/mp_machdep.c Mon Jul 25 15:56:37 2016
(r303306)
+++ head/sys/arm64/arm64/mp_machdep.c Mon Jul 25 15:57:13 2016
(r303307)
@@ -454,9 +454,16 @@ cpu_init_fdt(u_int id, phandle_t node, u
if (id == cpu0)
return (1);
+ /*
+ * Rotate the CPU IDs to put the boot CPU as CPU 0. We keep the other
+ * CPUs ordered as the are likely grouped into clusters so it can be
+ * useful to keep that property, e.g. for the GICv3 driver to send
+ * an IPI to all CPUs in the cluster.
+ */
cpuid = id;
if (cpuid < cpu0)
- cpuid++;
+ cpuid += mp_maxid + 1;
+ cpuid -= cpu0;
pcpup = &__pcpu[cpuid];
pcpu_init(pcpup, cpuid, sizeof(struct pcpu));
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