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Message-ID: <87be3ed7be9949f6e929c2b185dc7d623d525f8e.camel@intel.com>
Date: Thu, 15 Jul 2021 16:51:36 +0000
From: "Winiarska, Iwona" <iwona.winiarska@...el.com>
To: "Williams, Dan J" <dan.j.williams@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
CC: "corbet@....net" <corbet@....net>,
"jae.hyun.yoo@...ux.intel.com" <jae.hyun.yoo@...ux.intel.com>,
"Lutomirski, Andy" <luto@...nel.org>,
"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
"Luck, Tony" <tony.luck@...el.com>,
"andrew@...id.au" <andrew@...id.au>,
"mchehab@...nel.org" <mchehab@...nel.org>,
"jdelvare@...e.com" <jdelvare@...e.com>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"linux@...ck-us.net" <linux@...ck-us.net>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"yazen.ghannam@....com" <yazen.ghannam@....com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"joel@....id.au" <joel@....id.au>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"andriy.shevchenko@...ux.intel.com"
<andriy.shevchenko@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>,
"pierre-louis.bossart@...ux.intel.com"
<pierre-louis.bossart@...ux.intel.com>
Subject: Re: [PATCH 02/14] x86/cpu: Extract cpuid helpers to arch-independent
On Wed, 2021-07-14 at 16:58 +0000, Williams, Dan J wrote:
> On Tue, 2021-07-13 at 00:04 +0200, Iwona Winiarska wrote:
> > Baseboard management controllers (BMC) often run Linux but are
> > usually
> > implemented with non-X86 processors. They can use PECI to access
> > package
> > config space (PCS) registers on the host CPU and since some
> > information,
> > e.g. figuring out the core count, can be obtained using different
> > registers on different CPU generations, they need to decode the
> > family
> > and model.
> >
> > The format of Package Identifier PCS register that describes CPUID
> > information has the same layout as CPUID_1.EAX, so let's allow to
> > reuse
> > cpuid helpers by making it available for other architectures as
> > well.
>
> Just some minor comments below.
>
> You can go ahead and add:
>
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
>
> >
> > Signed-off-by: Iwona Winiarska <iwona.winiarska@...el.com>
> > Reviewed-by: Tony Luck <tony.luck@...el.com>
> > ---
> > MAINTAINERS | 2 ++
> > arch/x86/Kconfig | 1 +
> > arch/x86/include/asm/cpu.h | 3 ---
> > arch/x86/include/asm/microcode.h | 2 +-
> > arch/x86/kvm/cpuid.h | 3 ++-
> > arch/x86/lib/Makefile | 2 +-
> > drivers/edac/mce_amd.c | 3 +--
> > include/linux/x86/cpu.h | 9 +++++++++
> > lib/Kconfig | 5 +++++
> > lib/Makefile | 2 ++
> > lib/x86/Makefile | 3 +++
> > {arch/x86/lib => lib/x86}/cpu.c | 2 +-
> > 12 files changed, 28 insertions(+), 9 deletions(-)
> > create mode 100644 include/linux/x86/cpu.h
> > create mode 100644 lib/x86/Makefile
> > rename {arch/x86/lib => lib/x86}/cpu.c (95%)
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index ec5987a00800..6f77aaca2a30 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -20081,6 +20081,8 @@ T: git
> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/core
> > F: Documentation/devicetree/bindings/x86/
> > F: Documentation/x86/
> > F: arch/x86/
> > +F: include/linux/x86/
>
> Doesn't this technically belong in patch1 since that one introduced
> the directory?
In the first patch we are moving arch/x86/include/intel-family.h
content to a new file, which is why I updated MAINTAINERS just for
"INTEL CPU family model numbers".
Here we're moving other content that was maintained under arch/x86
which is why I extended "X86 ARCHITECTURE (32-BIT AND 64-BIT)".
But I agree - "X86 ARCHITECTURE" includes "INTEL CPU family", so I
guess it makes sense to add both in previous patch (otherwise
get_maintainer.pl would produce different output for
include/linux/x86/intel-family.h until this patch is applied).
Thank you
-Iwona
>
> > +F: lib/x86/
> >
> > X86 ENTRY CODE
> > M: Andy Lutomirski <luto@...nel.org>
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index 49270655e827..750f9b896e4f 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -141,6 +141,7 @@ config X86
> > select GENERIC_IRQ_PROBE
> > select GENERIC_IRQ_RESERVATION_MODE
> > select GENERIC_IRQ_SHOW
> > + select GENERIC_LIB_X86
> > select GENERIC_PENDING_IRQ if SMP
> > select GENERIC_PTDUMP
> > select GENERIC_SMP_IDLE_THREAD
> > diff --git a/arch/x86/include/asm/cpu.h
> > b/arch/x86/include/asm/cpu.h
> > index 33d41e350c79..2a663a05a795 100644
> > --- a/arch/x86/include/asm/cpu.h
> > +++ b/arch/x86/include/asm/cpu.h
> > @@ -37,9 +37,6 @@ extern int _debug_hotplug_cpu(int cpu, int
> > action);
> >
> > int mwait_usable(const struct cpuinfo_x86 *);
> >
> > -unsigned int x86_family(unsigned int sig);
> > -unsigned int x86_model(unsigned int sig);
> > -unsigned int x86_stepping(unsigned int sig);
> > #ifdef CONFIG_CPU_SUP_INTEL
> > extern void __init sld_setup(struct cpuinfo_x86 *c);
> > extern void switch_to_sld(unsigned long tifn);
> > diff --git a/arch/x86/include/asm/microcode.h
> > b/arch/x86/include/asm/microcode.h
> > index ab45a220fac4..4b0eabf63b98 100644
> > --- a/arch/x86/include/asm/microcode.h
> > +++ b/arch/x86/include/asm/microcode.h
> > @@ -2,9 +2,9 @@
> > #ifndef _ASM_X86_MICROCODE_H
> > #define _ASM_X86_MICROCODE_H
> >
> > -#include <asm/cpu.h>
> > #include <linux/earlycpio.h>
> > #include <linux/initrd.h>
> > +#include <linux/x86/cpu.h>
>
> Has this patch set received a build success notification from the
> kbuild robot? I.e. are you sure that this include was only here for
> the
>
> unsigned int x86_family(unsigned int sig);
> unsigned int x86_model(unsigned int sig);
> unsigned int x86_stepping(unsigned int sig);
>
> ...helpers. All the other replacements look trivially verifiable as
> only needing these 3 helpers.
>
> >
> > struct ucode_patch {
> > struct list_head plist;
> > diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> > index c99edfff7f82..bf070d2a2175 100644
> > --- a/arch/x86/kvm/cpuid.h
> > +++ b/arch/x86/kvm/cpuid.h
> > @@ -4,10 +4,11 @@
> >
> > #include "x86.h"
> > #include "reverse_cpuid.h"
> > -#include <asm/cpu.h>
> > #include <asm/processor.h>
> > #include <uapi/asm/kvm_para.h>
> >
> > +#include <linux/x86/cpu.h>
> > +
> > extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
> > void kvm_set_cpu_caps(void);
> >
> > diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
> > index bad4dee4f0e4..fd73c1b72c3e 100644
> > --- a/arch/x86/lib/Makefile
> > +++ b/arch/x86/lib/Makefile
> > @@ -41,7 +41,7 @@ clean-files := inat-tables.c
> >
> > obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o
> >
> > -lib-y := delay.o misc.o cmdline.o cpu.o
> > +lib-y := delay.o misc.o cmdline.o
> > lib-y += usercopy_$(BITS).o usercopy.o getuser.o putuser.o
> > lib-y += memcpy_$(BITS).o
> > lib-$(CONFIG_ARCH_HAS_COPY_MC) += copy_mc.o copy_mc_64.o
> > diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
> > index 27d56920b469..f545f5fad02c 100644
> > --- a/drivers/edac/mce_amd.c
> > +++ b/drivers/edac/mce_amd.c
> > @@ -1,8 +1,7 @@
> > // SPDX-License-Identifier: GPL-2.0-only
> > #include <linux/module.h>
> > #include <linux/slab.h>
> > -
> > -#include <asm/cpu.h>
> > +#include <linux/x86/cpu.h>
> >
> > #include "mce_amd.h"
> >
> > diff --git a/include/linux/x86/cpu.h b/include/linux/x86/cpu.h
> > new file mode 100644
> > index 000000000000..5f383d47886d
> > --- /dev/null
> > +++ b/include/linux/x86/cpu.h
> > @@ -0,0 +1,9 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +#ifndef _LINUX_X86_CPU_H
> > +#define _LINUX_X86_CPU_H
> > +
> > +unsigned int x86_family(unsigned int sig);
> > +unsigned int x86_model(unsigned int sig);
> > +unsigned int x86_stepping(unsigned int sig);
> > +
> > +#endif /* _LINUX_X86_CPU_H */
> > diff --git a/lib/Kconfig b/lib/Kconfig
> > index d241fe476fda..cc28bc1f2d84 100644
> > --- a/lib/Kconfig
> > +++ b/lib/Kconfig
> > @@ -718,3 +718,8 @@ config PLDMFW
> >
> > config ASN1_ENCODER
> > tristate
> > +
> > +config GENERIC_LIB_X86
> > + bool
> > + depends on X86
> > + default n
>
> No need for a "default n" line. Omitting a default is the same as
> "default n".
>
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