linux-kernel - Re: [PATCH] ARM64:DMI: Add smbios/dmi support on arm64

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Message-ID: <20140604133200.GA4329@leverpostej>
Date:	Wed, 4 Jun 2014 14:32:01 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Yi Li <yi.li@...aro.org>
Cc:	"ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM64:DMI: Add smbios/dmi support on arm64

On Tue, Jun 03, 2014 at 04:57:13PM +0100, Yi Li wrote:
> Add smbios/dmi support on arm64 system, it depends on
> EFI boot.

And what exactly does this provide us with?

What is exposed through SMBIOS/DMI, and why would I want to enable it?

> 
> Signed-off-by: Yi Li <yi.li@...aro.org>
> ---
> 
> Changes since v1:
>   -Followed Ard Biesheuvel's suggestion to rebase the patch on
>    Matt Fleming's arm64-efi branch.
> 
>  arch/arm64/Kconfig           |   10 ++++++++++
>  arch/arm64/include/asm/dmi.h |   28 ++++++++++++++++++++++++++++
>  arch/arm64/kernel/setup.c    |    2 ++
>  3 files changed, 40 insertions(+)
>  create mode 100644 arch/arm64/include/asm/dmi.h
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 6c71f12..13ee261 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -294,6 +294,16 @@ config EFI
>  	  allow the kernel to be booted as an EFI application. This
>  	  is only useful on systems that have UEFI firmware.
>  
> +config DMI
> +	bool "Enable support for SMBIOS (DMI) tables"
> +	depends on EFI
> +	default y
> +	help
> +	  This enables SMBIOS/DMI feature for systems.
> +
> +	  This option is only useful on systems that have UEFI firmware.
> +	  However, even with this option, the resultant kernel should
> +	  continue to boot on existing non-UEFI platforms.
>  endmenu
>  
>  menu "Userspace binary formats"
> diff --git a/arch/arm64/include/asm/dmi.h b/arch/arm64/include/asm/dmi.h
> new file mode 100644
> index 0000000..f2198bf
> --- /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@...aro.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
> +
> +#include <linux/slab.h>
> +#include <asm/io.h>

Shouldn't that be linux/efi.h?

Why do we need asm/io.h?

> +
> +/* Use efi mappings for DMI */
> +#define dmi_early_remap(x, l)	efi_lookup_mapped_addr(x)
> +#define dmi_early_unmap(x, l)
> +#define dmi_remap(x, l)			efi_lookup_mapped_addr(x)
> +#define dmi_unmap(x)
> +#define dmi_alloc(l)			kzalloc(l, GFP_ATOMIC)
> +
> +#endif

None of these seem to use anything from io.h directly.

Cheers,
Mark.
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