Re: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description

[Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>]

On Fri, Dec 04, 2015 at 11:24:25AM +0800, Wang Hongcheng wrote:
> From: Wan Zongshun <Vincent.Wan-5C7GfCeVMHo@public.gmane.org>
> 
> Add ivrs_acpihid kernel parameter description,
> like ivrs_acpihid[00:14.5]=AMD0020:0.
> 
> Signed-off-by: Wan Zongshun <Vincent.Wan-5C7GfCeVMHo@public.gmane.org>
> ---
>  Documentation/kernel-parameters.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 742f69d..5c364c6 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1680,6 +1680,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  			PCI device 00:14.0 write the parameter as:
>  				ivrs_hpet[0]=00:14.0
>  
> +	ivrs_acpihid	[HW,X86_64]
> +			Provide an override to the ACPI-HID:UID<->DEVICE-ID
> +			mapping provided in the IVRS ACPI table. For
> +			example, to map UART-HID:UID AMD0020:0 to
> +			PCI device 00:14.5 write the parameter as:
> +				ivrs_acpihid[00:14.5]=AMD0020:0

What is that parameter needed for? Can't you deduce the mapping from the
hardware?

-- 
Regards/Gruss,
    Boris.

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