linux-kernel - Re: [PATCH v8 14/21] ACPI / processor: Make it possible to get CPU hardware ID via GICC

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Date:	Thu, 5 Feb 2015 10:52:02 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	Mark Rutland <Mark.Rutland@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Mark Langsdorf <mlangsdo@...hat.com>,
	"wangyijing@...wei.com" <wangyijing@...wei.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH v8 14/21] ACPI / processor: Make it possible to get CPU
 hardware ID via GICC

On Thu, Feb 05, 2015 at 09:27:15AM +0000, Hanjun Guo wrote:
> On 2015年02月04日 19:21, Catalin Marinas wrote:
> > On Wed, Feb 04, 2015 at 09:48:05AM +0000, Hanjun Guo wrote:
> >> On 2015年02月04日 04:09, Catalin Marinas wrote:
> >>> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> >>> index ea4d2b35c57b..4fafd62b1b86 100644
> >>> --- a/arch/arm64/include/asm/acpi.h
> >>> +++ b/arch/arm64/include/asm/acpi.h
> >>> @@ -49,33 +49,12 @@ static inline void enable_acpi(void)
> >>>    	acpi_noirq = 0;
> >>>    }
> >>>
> >>> -/* MPIDR value provided in GICC structure is 64 bits, but the
> >>> - * existing phys_id (CPU hardware ID) using in acpi processor
> >>> - * driver is 32-bit, to conform to the same datatype we need
> >>> - * to repack the GICC structure MPIDR.
> >>> - *
> >>> - * bits other than following 32 bits are defined as 0, so it
> >>> - * will be no information lost after repacked.
> >>> - *
> >>> - * Bits [0:7] Aff0;
> >>> - * Bits [8:15] Aff1;
> >>> - * Bits [16:23] Aff2;
> >>> - * Bits [32:39] Aff3;
> >>> - */
> >>> -static inline u32 pack_mpidr(u64 mpidr)
> >>> -{
> >>> -	return (u32) ((mpidr & 0xff00000000) >> 8) | mpidr;
> >>> -}
> >>> -
> >>>    /*
> >>>     * The ACPI processor driver for ACPI core code needs this macro
> >>>     * to find out this cpu was already mapped (mapping from CPU hardware
> >>>     * ID to CPU logical ID) or not.
> >>> - *
> >>> - * cpu_logical_map(cpu) is the mapping of MPIDR and the logical cpu,
> >>> - * and MPIDR is the cpu hardware ID we needed to pack.
> >>>     */
> >>> -#define cpu_physical_id(cpu) pack_mpidr(cpu_logical_map(cpu))
> >>> +#define cpu_physical_id(cpu) cpu_logical_map(cpu)
> >>>
> >>>    /*
> >>>     * It's used from ACPI core in kdump to boot UP system with SMP kernel,
> >>> diff --git a/arch/arm64/include/asm/smp_plat.h b/arch/arm64/include/asm/smp_plat.h
> >>> index 59e282311b58..a492276e008d 100644
> >>> --- a/arch/arm64/include/asm/smp_plat.h
> >>> +++ b/arch/arm64/include/asm/smp_plat.h
> >>> @@ -40,4 +40,6 @@ static inline u32 mpidr_hash_size(void)
> >>>    extern u64 __cpu_logical_map[NR_CPUS];
> >>>    #define cpu_logical_map(cpu)    __cpu_logical_map[cpu]
> >>>
> >>> +typedef u64 cpuid_t;
> >>
> >> I think cpuid_t is a little confused because people may recognize
> >> it as cpu logical id, its original meaning is the physical cpu ID,
> >> so how about:
> >>
> >> typedef u64 phys_id_t; ?
> >
> > I would keep "cpu" somewhere in the name as "phys" is too generic, maybe
> > phys_cpuid_t.
> 
> This is pretty fine to me too :)
> 
> x86 and IA64 use 32 bit cpu phys_id (apic_id) everywhere in the arch
> code, but I think I don't need to touch them in this patch.

No, as long as you define phys_cpuid_t to be 32-bit (I guess an int) on
these architectures.

-- 
Catalin
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