On Wed, Oct 04, 2017 at 05:48:37PM -0500, Mario Limonciello wrote:
> The dell-smbios stack only currently uses an SMI interface which grants
> direct access to physical memory to the firmware SMM methods via a pointer.
>
> This dispatcher driver adds a WMI-ACPI interface that is detected by WMI
> probe and preferred over the SMI interface in dell-smbios.
>
> Changing this to operate over WMI-ACPI will use an ACPI OperationRegion
> for a buffer of data storage when SMM calls are performed.
>
> This is a safer approach to use in kernel drivers as the SMM will
> only have access to that OperationRegion.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxxx>
> ---
> MAINTAINERS | 6 +
> drivers/platform/x86/Kconfig | 16 ++-
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/dell-smbios-wmi.c | 215 +++++++++++++++++++++++++++++++++
> drivers/platform/x86/dell-smbios-wmi.h | 28 +++++
> 5 files changed, 265 insertions(+), 1 deletion(-)
> create mode 100644 drivers/platform/x86/dell-smbios-wmi.c
> create mode 100644 drivers/platform/x86/dell-smbios-wmi.h
>
...
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index f0b97cb8e449..ef597f440d2e 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -93,13 +93,27 @@ config ASUS_LAPTOP
>
> config DELL_SMBIOS
> tristate "Dell SMBIOS calling interface"
> - depends on DELL_SMBIOS_SMM
> + depends on DELL_SMBIOS_WMI || DELL_SMBIOS_SMM
> ---help---
> This module provides common functions for kernel modules using
> Dell SMBIOS.
You use select DELL_SMBIOS below, which implies this modules should be
invisible. Indeed, there is no need for the user to see the DELL_SMBIOS
option at all now, they can select DELL_SMBIOS_WMI and or
DELL_SMBIOS_SMM, no need to keep the DELL_SMBIOS option.
> diff --git a/drivers/platform/x86/dell-smbios-wmi.c b/drivers/platform/x86/dell-smbios-wmi.c
> +static void __init parse_b1_table(const struct dmi_header *dm)
> +{
> + struct misc_bios_flags_structure *flags =
> + container_of(dm, struct misc_bios_flags_structure, header);
> +
> + /* 4 bytes header, and one word of flags */
Assuming specifically 8 bytes of flags, independent of arch?
--
Darren Hart
VMware Open Source Technology Center
