Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753114AbbLDOiN (ORCPT ); Fri, 4 Dec 2015 09:38:13 -0500 Received: from mail.skyhub.de ([78.46.96.112]:48427 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752565AbbLDOiK (ORCPT ); Fri, 4 Dec 2015 09:38:10 -0500 Date: Fri, 4 Dec 2015 15:38:03 +0100 From: Borislav Petkov To: "Wan, Vincent" Cc: "Wang, Annie" , Vinod Koul , Mika Westerberg , Joerg Roedel , Greg Kroah-Hartman , "Rafael J. Wysocki" , "linux-acpi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-serial@vger.kernel.org" , "dmaengine@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "Huang, Ray" , "Xue, Ken" , "Li, Tony" Subject: Re: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description Message-ID: <20151204143803.GH21177@pd.tnic> References: <1449199466-6081-1-git-send-email-annie.wang@amd.com> <1449199466-6081-9-git-send-email-annie.wang@amd.com> <20151204122149.GD21177@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1158 Lines: 28 On Fri, Dec 04, 2015 at 01:19:35PM +0000, Wan, Vincent wrote: > > > + 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. Please add a verbose, human-readable explanation to the text so that people know what it is for. The text above is hard to parse even for insiders. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/