From mboxrd@z Thu Jan 1 00:00:00 1970 From: Will Deacon Subject: Re: [PATCH V10 2/6] arm: arm64: Add routine to determine cpuid of other cpus Date: Tue, 29 Nov 2016 10:31:12 +0000 Message-ID: <20161129103112.GC30283@arm.com> References: <1478734793-6341-1-git-send-email-jeremy.linton@arm.com> <1478734793-6341-3-git-send-email-jeremy.linton@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from foss.arm.com ([217.140.101.70]:41112 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754000AbcK2KbN (ORCPT ); Tue, 29 Nov 2016 05:31:13 -0500 Content-Disposition: inline In-Reply-To: <1478734793-6341-3-git-send-email-jeremy.linton@arm.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Jeremy Linton , linux@armlinux.org.uk Cc: linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com, steve.capper@arm.com, mlangsdorf@redhat.com, punit.agrawal@arm.com, linux-acpi@vger.kernel.org, msalter@redhat.com [adding Russell] On Wed, Nov 09, 2016 at 05:39:49PM -0600, Jeremy Linton wrote: > It is helpful if we can read the cpuid/midr of other CPUs > in the system independent of arm/arm64. > > Signed-off-by: Jeremy Linton > --- > arch/arm/include/asm/cputype.h | 2 ++ > arch/arm64/include/asm/cputype.h | 3 +++ > 2 files changed, 5 insertions(+) > > diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h > index 522b5fe..31fb273 100644 > --- a/arch/arm/include/asm/cputype.h > +++ b/arch/arm/include/asm/cputype.h > @@ -235,6 +235,8 @@ static inline unsigned int __attribute_const__ read_cpuid_mpidr(void) > #define cpu_is_sa1100() (read_cpuid_part() == ARM_CPU_PART_SA1100) > #define cpu_is_sa1110() (read_cpuid_part() == ARM_CPU_PART_SA1110) > > +#define read_specific_cpuid(cpu_num) per_cpu_ptr(&cpu_data, cpu_num)->cpuid > + > /* > * Intel's XScale3 core supports some v6 features (supersections, L2) > * but advertises itself as v5 as it does not support the v6 ISA. For Russell -- are you ok with adding this macro to arch/arm/? It will get used by the CPU PMU driver, which needs a portable (i.e. between arm and arm64) way to convert a logical CPU ID into the MIDR register for that CPU. Thanks, Will