From owner-svn-src-head@FreeBSD.ORG  Tue Mar  3 11:22:54 2015
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 38BBD29F;
 Tue,  3 Mar 2015 11:22:54 +0000 (UTC)
Received: from mail.turbocat.net (heidi.turbocat.net [88.198.202.214])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id EA154B82;
 Tue,  3 Mar 2015 11:22:53 +0000 (UTC)
Received: from laptop015.home.selasky.org
 (cm-176.74.213.204.customer.telag.net [176.74.213.204])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by mail.turbocat.net (Postfix) with ESMTPSA id 8849B1FE022;
 Tue,  3 Mar 2015 12:22:51 +0100 (CET)
Message-ID: <54F599BA.5060708@freebsd.org>
Date: Tue, 03 Mar 2015 12:23:38 +0100
From: Hans Petter Selasky <hselasky@freebsd.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
 rv:31.0) Gecko/20100101 Thunderbird/31.4.0
MIME-Version: 1.0
To: Marius Strobl <marius@alchemy.franken.de>
Subject: Re: svn commit: r279563 - head/sys/dev/usb/controller
References: <201503031021.t23ALtIK094082@svn.freebsd.org>
 <20150303110104.GA65391@alchemy.franken.de>
In-Reply-To: <20150303110104.GA65391@alchemy.franken.de>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers@freebsd.org
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 03 Mar 2015 11:22:54 -0000

On 03/03/15 12:01, Marius Strobl wrote:
> On Tue, Mar 03, 2015 at 10:21:55AM +0000, Hans Petter Selasky wrote:
>> Author: hselasky
>> Date: Tue Mar  3 10:21:54 2015
>> New Revision: 279563
>> URL: https://svnweb.freebsd.org/changeset/base/279563
>>
>> Log:
>>    Add quirk for USB 3.0 controllers which don't support 64-bit DMA.
>>
>
> Hrm, this is strange; I checked Linux sources when adding 64-bit DMA
> support and while they handle tons of quirks for USB controllers
> (which FreeBSD doesn't), they don't have a single such exception for
> 64-bit DMA. Are you sure using 64-bit DMA doesn't just reveal another
> problem? F. e., Linux issues an extra doorbell ring for XHCI_NEC_HOST
> and generally reads back the doorbell register in order to flush PCI
> writes.
>
> Marius
>
>

I'll check with Gary if he can test a patch for flushing posted PCI writes.

--HPS