linux-kernel - Re: [PATCH v2] riscv: dmi: Add SMBIOS/DMI support

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Date: Wed, 26 Jun 2024 08:03:08 -0700 (PDT)
From: Palmer Dabbelt <palmer@...belt.com>
To: xiaobo55x@...il.com
CC: Atish Patra <atishp@...osinc.com>, haibo1.xu@...el.com,
  linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, linux-efi@...r.kernel.org,
  aou@...s.berkeley.edu, Paul Walmsley <paul.walmsley@...ive.com>, Ard Biesheuvel <ardb@...nel.org>
Subject:     Re: [PATCH v2] riscv: dmi: Add SMBIOS/DMI support

On Sun, 26 May 2024 02:17:40 PDT (-0700), xiaobo55x@...il.com wrote:
> kindly ping!
>
> Any more comments on this patch?

Sorry I dropped the ball on this one, it's queued up for staging and 
should show up on for-next assuming it passes the tests.

>
> Thanks,
> Haibo
>
> On Mon, Apr 29, 2024 at 10:22 PM Haibo Xu <xiaobo55x@...il.com> wrote:
>>
>> Hi @Palmer,
>>
>> Could you please let me know whether this patch was OK for the next RISC-V PULL?
>>
>> Thanks,
>> Haibo
>>
>> On Wed, Mar 20, 2024 at 3:46 AM Atish Patra <atishp@...osinc.com> wrote:
>> >
>> > On 3/17/24 19:09, Haibo Xu wrote:
>> > > 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@...el.com>
>> > > ---
>> > > Changes since v1
>> > >    - Change to use memremap/memunmap for dmi_(early)_remap/unmap
>> > >      definition(suggested by Ard)
>> > >    - Minor clean up for comments (Ard)
>> > > ---
>> > >   arch/riscv/Kconfig                   | 11 +++++++++++
>> > >   arch/riscv/include/asm/dmi.h         | 24 ++++++++++++++++++++++++
>> > >   drivers/firmware/efi/riscv-runtime.c | 13 +++++++++++++
>> > >   3 files changed, 48 insertions(+)
>> > >   create mode 100644 arch/riscv/include/asm/dmi.h
>> > >
>> > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>> > > index 8ebafe337eac..3639151cb4ef 100644
>> > > --- a/arch/riscv/Kconfig
>> > > +++ b/arch/riscv/Kconfig
>> > > @@ -952,6 +952,17 @@ 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)
>> > >
>> > > diff --git a/arch/riscv/include/asm/dmi.h b/arch/riscv/include/asm/dmi.h
>> > > new file mode 100644
>> > > index 000000000000..ca7cce557ef7
>> > > --- /dev/null
>> > > +++ b/arch/riscv/include/asm/dmi.h
>> > > @@ -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
>> > > diff --git a/drivers/firmware/efi/riscv-runtime.c b/drivers/firmware/efi/riscv-runtime.c
>> > > index 09525fb5c240..c3bfb9e77e02 100644
>> > > --- a/drivers/firmware/efi/riscv-runtime.c
>> > > +++ b/drivers/firmware/efi/riscv-runtime.c
>> > > @@ -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);
>> >
>> > Reviewed-by: Atish Patra <atishp@...osinc.com>