Commit 668ebd10 authored by Yi Li's avatar Yi Li Committed by Catalin Marinas
Browse files

arm64: dmi: Add SMBIOS/DMI support 



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.

This patch adds the call to dmi_scan_machine() to arm64_enter_virtual_mode(),
as that is the point where the EFI Configuration Tables are registered as
being available. It needs to be in an early_initcall anyway as dmi_id_init(),
which is an arch_initcall itself, depends on dmi_scan_machine() having been
called already.

Signed-off-by: default avatarYi Li <yi.li@linaro.org>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 9f1ae759

arch/arm64/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -369,6 +369,17 @@ 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"

arch/arm64/include/asm/dmi.h

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/*

 * arch/arm64/include/asm/dmi.h

 *

 * Copyright (C) 2013 Linaro Limited.

 * Written by: Yi Li (yi.li@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



#include <linux/io.h>

#include <linux/slab.h>



/*

 * According to section 2.3.6 of the UEFI spec, the firmware should not

 * request a virtual mapping for configuration tables such as SMBIOS.

 * This means we have to map them before use.

 */

#define dmi_early_remap(x, l)		ioremap_cache(x, l)

#define dmi_early_unmap(x, l)		iounmap(x)

#define dmi_remap(x, l)			ioremap_cache(x, l)

#define dmi_unmap(x)			iounmap(x)

#define dmi_alloc(l)			kzalloc(l, GFP_KERNEL)



#endif

arch/arm64/kernel/efi.c

+8 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
 *

 */



#include <linux/dmi.h>

#include <linux/efi.h>

#include <linux/export.h>

#include <linux/memblock.h>
@@ -435,6 +436,13 @@ static int __init arm64_enter_virtual_mode(void) 
	}

	set_bit(EFI_SYSTEM_TABLES, &efi.flags);



	/*

	 * DMI depends on EFI on arm64, and dmi_scan_machine() needs to be

	 * called early because dmi_id_init(), which is an arch_initcall itself,

	 * depends on dmi_scan_machine() having been called already.

	 */

	dmi_scan_machine();



	local_irq_save(flags);

	cpu_switch_mm(idmap_pg_dir, &init_mm);

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