linux-kernel - RE: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description

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Message-ID: <DM3PR1201MB10232DEAF03CAAE29D21FC1AE60C0@DM3PR1201MB1023.namprd12.prod.outlook.com>
Date:	Fri, 4 Dec 2015 13:19:35 +0000
From:	"Wan, Vincent" <Vincent.Wan@....com>
To:	Borislav Petkov <bp@...en8.de>, "Wang, Annie" <Annie.Wang@....com>
CC:	Vinod Koul <vinod.koul@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Joerg Roedel <joro@...tes.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"Huang, Ray" <Ray.Huang@....com>, "Xue, Ken" <Ken.Xue@....com>,
	"Li, Tony" <Tony.Li@....com>
Subject: RE: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter
 description

> > +	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?

It is very like ivrs_ioapic/ ivrs_hpet, which can override the dedicated BDF id mapped to HID:UID that was reported from BIOS's IVHD entry.
If BIOS did not report a right BDF, we can resort to this parameter to correct it.

> 
> --
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply.