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authorYi Li <yi.li@linaro.org>2014-07-11 12:46:50 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2014-07-21 10:22:21 +0100
commita28e3f4b90543f7c249a956e3ca518e243a04618 (patch)
treebeb5616e53df9b843da764572a2284609b9317db /arch/arm64
parentd7a49086f263164a2c4c178eb76412d48cd671d7 (diff)
downloadlinux-a28e3f4b90543f7c249a956e3ca518e243a04618.tar.gz
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. Signed-off-by: Yi Li <yi.li@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/Kconfig11
-rw-r--r--arch/arm64/include/asm/dmi.h41
-rw-r--r--arch/arm64/kernel/setup.c2
3 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ce6e733e0c05..62a71e829770 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -311,6 +311,17 @@ 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"
diff --git a/arch/arm64/include/asm/dmi.h b/arch/arm64/include/asm/dmi.h
new file mode 100644
index 000000000000..b0882a8620e1
--- /dev/null
+++ b/arch/arm64/include/asm/dmi.h
@@ -0,0 +1,41 @@
+/*
+ * 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/slab.h>
+#include <linux/efi.h>
+
+static inline void __iomem *dmi_remap(u64 phys, u64 size)
+{
+ void __iomem *p = efi_lookup_mapped_addr(phys);
+
+ /*
+ * If the mapping spans multiple pages, do a minimal check to ensure
+ * that the mapping returned by efi_lookup_mapped_addr() covers the
+ * whole requested range (but ignore potential holes)
+ */
+ if ((phys & ~PAGE_MASK) + size > PAGE_SIZE
+ && (p + size - 1) != efi_lookup_mapped_addr(phys + size - 1))
+ return NULL;
+ return p;
+}
+
+/* Reuse existing UEFI mappings for DMI */
+#define dmi_alloc(l) kzalloc(l, GFP_KERNEL)
+#define dmi_early_remap(x, l) dmi_remap(x, l)
+#define dmi_early_unmap(x, l)
+#define dmi_unmap(x)
+
+#endif
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index f6f0ccf35ae6..35339a0e1592 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -43,6 +43,7 @@
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/efi.h>
+#include <linux/dmi.h>
#include <asm/fixmap.h>
#include <asm/cpu.h>
@@ -413,6 +414,7 @@ void __init setup_arch(char **cmdline_p)
static int __init arm64_device_init(void)
{
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ dmi_scan_machine();
return 0;
}
arch_initcall_sync(arm64_device_init);