From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753130AbcLLTEF (ORCPT ); Mon, 12 Dec 2016 14:04:05 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:34935 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752366AbcLLTED (ORCPT ); Mon, 12 Dec 2016 14:04:03 -0500 Date: Mon, 12 Dec 2016 11:04:02 -0800 From: Christoph Hellwig To: Tejun Heo Cc: Linus Torvalds , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] libata changes for v4.10-rc1 Message-ID: <20161212190402.GA8592@infradead.org> References: <20161212183209.GE13864@htj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161212183209.GE13864@htj.duckdns.org> User-Agent: Mutt/1.6.1 (2016-04-27) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 12, 2016 at 01:32:09PM -0500, Tejun Heo wrote: > Hello, Linus. > > * Adam added opt-in ATA command priority support. > > * There are machines which hide multiple nvme devices behind an ahci > BAR. Dan Williams proposed a solution to force-switch the mode but > deemed too hackishd. People are gonna discuss the proper way to > handle the situation in nvme standard meetings. For now, detect and > warn about the situation. I wish that was the case. We've pretty much agreed that we'll want to implement it as a virtual PCIe root bridge, similar to Intels other "innovation" VMD that we work around that way. But Intel management has apparently decided that they don't want to spend more cycles on this now that Lenovo has an optional BIOS that doesn't force this broken mode anymore, and no one outside of Intel has enough information to implement something like this. So for now I guess this warning is it, until Intel reconsideres and spends resources on fixing up the damage their Chipset people caused.