Date: Mon, 25 Jul 2016 15:57:14 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r303307 - head/sys/arm64/arm64 Message-ID: <201607251557.u6PFvEle077319@repo.freebsd.org>
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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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