[PATCH resend] arm64: dmi: Add SMBIOS/DMI support

[will.deacon@arm.com (Will Deacon)]

On Tue, Jul 08, 2014 at 09:55:53AM +0100, Ard Biesheuvel wrote:
> On 2 July 2014 12:34, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> > From: Yi Li <yi.li@linaro.org>
> >
> > SMbios is important for server hardware vendors. It implements a spec for
> > providing descriptive information about the platform. Things like serial
> > numbers, physical layout of the ports, build configuration data, and the like.
> >
> > This has been tested by dmidecode and lshw tools.
> >
> > Signed-off-by: Yi Li <yi.li@linaro.org>
> > [ardb: whitespace, commit log tweaks]
> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> > ---
> >
> > Resending on behalf of Yi.
> > Please consider for 3.17.
> >
> 
> Ping?

Not sure what this does, but I can review it on a superficial level :)

> > diff --git a/arch/arm64/include/asm/dmi.h b/arch/arm64/include/asm/dmi.h
> > new file mode 100644
> > index 000000000000..b8758f46fb42
> > --- /dev/null
> > +++ b/arch/arm64/include/asm/dmi.h
> > @@ -0,0 +1,28 @@
> > +/*
> > + * arch/arm64/include/asm/dmi.h
> > + *
> > + * Copyright (C) 2013 Linaro Limited.
> > + * Written by: Yi Li (yi.li at linaro.org)
> > + *
> > + * based on arch/ia64/include/asm/dmi.h
> > + *
> > + * This file is subject to the terms and conditions of the GNU General Public
> > + * License.  See the file "COPYING" in the main directory of this archive
> > + * for more details.
> > + */
> > +
> > +
> > +#ifndef _ASM_DMI_H
> > +#define _ASM_DMI_H 1

You don't need the 1 here (copied from ia64?). Also, please try to follow
the existing style for arm64 and use __ASM_DMI_H.

> > +#include <linux/slab.h>
> > +#include <linux/efi.h>
> > +
> > +/* Use efi mappings for DMI */
> > +#define dmi_early_remap(x, l)          efi_lookup_mapped_addr(x)

Throwing away the length doesn't feel right, especially since the efi map
*does* have a size field.

> > +#define dmi_early_unmap(x, l)
> > +#define dmi_remap(x, l)                        efi_lookup_mapped_addr(x)

How do we guarantee that we don't call these after efi_free_boot_services?
(it would be good to enforce that somehow).

> > +#define dmi_unmap(x)
> > +#define dmi_alloc(l)                   kzalloc(l, GFP_ATOMIC)

Why does this have to be atomic?

Will