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arm64: dmi: Add SMBIOS/DMI support

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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: Yi Li <yi.li@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Yi Li 2014-09-22 11:11:18 +01:00 committed by Catalin Marinas
parent 9f1ae7596a
commit 668ebd1068
3 changed files with 50 additions and 0 deletions
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11
arch/arm64/Kconfig
View File

@ -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"

31
arch/arm64/include/asm/dmi.h Normal file
View File

@ -0,0 +1,31 @@
/*
* 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

8
arch/arm64/kernel/efi.c
View File

@ -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);