Date: Sun, 29 Nov 2020 18:59:01 +0000 (UTC) From: Michal Meloun <mmel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r368161 - in head/sys/arm: arm include Message-ID: <202011291859.0ATIx1fs055981@repo.freebsd.org>
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Author: mmel Date: Sun Nov 29 18:59:01 2020 New Revision: 368161 URL: https://svnweb.freebsd.org/changeset/base/368161 Log: Store MPIDR register in pcpu. MPIDR represents physical locality of given core and it should be used as the only viable/robust connection between cpuid (which have zero relation to cores topology) and external description (for example in FDT). It can be used for determining which interrupt is associated to given per-CPU PMU or by scheduler for determining big/little core or cluster topology. MFC after: 3 weeks Modified: head/sys/arm/arm/machdep.c head/sys/arm/arm/mp_machdep.c head/sys/arm/include/pcpu.h Modified: head/sys/arm/arm/machdep.c ============================================================================== --- head/sys/arm/arm/machdep.c Sun Nov 29 18:22:14 2020 (r368160) +++ head/sys/arm/arm/machdep.c Sun Nov 29 18:59:01 2020 (r368161) @@ -302,6 +302,8 @@ DELAY(int usec) void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) { + + pcpu->pc_mpidr = 0xffffffff; } void @@ -684,6 +686,7 @@ pcpu0_init(void) { set_curthread(&thread0); pcpu_init(pcpup, 0, sizeof(struct pcpu)); + pcpup->pc_mpidr = cp15_mpidr_get() & 0xFFFFFF; PCPU_SET(curthread, &thread0); } Modified: head/sys/arm/arm/mp_machdep.c ============================================================================== --- head/sys/arm/arm/mp_machdep.c Sun Nov 29 18:22:14 2020 (r368160) +++ head/sys/arm/arm/mp_machdep.c Sun Nov 29 18:59:01 2020 (r368161) @@ -162,6 +162,7 @@ init_secondary(int cpu) ; pcpu_init(pc, cpu, sizeof(struct pcpu)); + pc->pc_mpidr = cp15_mpidr_get() & 0xFFFFFF; dpcpu_init(dpcpu[cpu - 1], cpu); #if defined(DDB) dbg_monitor_init_secondary(); Modified: head/sys/arm/include/pcpu.h ============================================================================== --- head/sys/arm/include/pcpu.h Sun Nov 29 18:22:14 2020 (r368160) +++ head/sys/arm/include/pcpu.h Sun Nov 29 18:59:01 2020 (r368161) @@ -65,7 +65,8 @@ struct vmspace; int pc_bp_harden_kind; \ uint32_t pc_original_actlr; \ uint64_t pc_clock; \ - char __pad[139] + uint32_t pc_mpidr; \ + char __pad[135] #ifdef _KERNEL
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