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riscv: dmi: Add SMBIOS/DMI support

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Enable the dmi driver for riscv which would allow access the
SMBIOS info through some userspace file(/sys/firmware/dmi/*).

The change was based on that of arm64 and has been verified
by dmidecode tool.

Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240613065507.287577-1-haibo1.xu@intel.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Haibo Xu 2024-06-13 14:55:07 +08:00 committed by Palmer Dabbelt
parent 50b5bae5be
commit d6ecd18893
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GPG Key ID: 2E1319F35FBB1889
3 changed files with 48 additions and 0 deletions
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11
arch/riscv/Kconfig
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@ -967,6 +967,17 @@ 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.
config CC_HAVE_STACKPROTECTOR_TLS
def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)

24
arch/riscv/include/asm/dmi.h Normal file
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@ -0,0 +1,24 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2024 Intel Corporation
*
* based on arch/arm64/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>
#define dmi_early_remap(x, l) memremap(x, l, MEMREMAP_WB)
#define dmi_early_unmap(x, l) memunmap(x)
#define dmi_remap(x, l) memremap(x, l, MEMREMAP_WB)
#define dmi_unmap(x) memunmap(x)
#define dmi_alloc(l) kzalloc(l, GFP_KERNEL)
#endif

13
drivers/firmware/efi/riscv-runtime.c
View File

@ -152,3 +152,16 @@ void arch_efi_call_virt_teardown(void)
{
efi_virtmap_unload();
}
static int __init riscv_dmi_init(void)
{
/*
* On riscv, DMI depends on UEFI, and dmi_setup() 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_setup();
return 0;
}
core_initcall(riscv_dmi_init);