From owner-freebsd-mips@freebsd.org Tue Dec 22 14:47:44 2015 Return-Path: Delivered-To: freebsd-mips@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DBB3DA4E6FB for ; Tue, 22 Dec 2015 14:47:43 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-ig0-x235.google.com (mail-ig0-x235.google.com [IPv6:2607:f8b0:4001:c05::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id ABA6C15BB for ; Tue, 22 Dec 2015 14:47:43 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: by mail-ig0-x235.google.com with SMTP id mv3so50897040igc.0 for ; Tue, 22 Dec 2015 06:47:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=Nl/v3i8etd+xtXgC9AoErCceMev4UaCzIw6+wq0SAok=; b=swyPgqbf9N8TjFZJkJaVeC4r8gek/1wLt0PyuH/QkSgOinm4h+lcUyUTLnlSJizH/w wPWe8wlpg6MKspsuuKugB7Gl8IcoUAuIr4hVt7oN1NicQeNUc7+eHsMzR6BLKOOS34sS jbAwOcQyQYfUkWiMkfryWdJX0ba6tsnEuQNi7BdAu1LjN/YW/aIuBwS7D4LTWZp2bP+S xovATjsjY0n1wKfQhqi1FFBGO9PtlDqSISeWSxZcKxBoXTF9s++QGBa0H1SI3Hybm/vD j1rYjLNKD74j0Ln8OlWqE4rFQOFet0PrsXWDaxoLZfzVCMnQYLOzbPO5qKLRPWZKxoZD kA9Q== MIME-Version: 1.0 X-Received: by 10.50.25.169 with SMTP id d9mr23493706igg.61.1450795663063; Tue, 22 Dec 2015 06:47:43 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.36.121.202 with HTTP; Tue, 22 Dec 2015 06:47:42 -0800 (PST) In-Reply-To: <20151222112653.GB21902@cicely7.cicely.de> References: <5678DAF8.6000807@grosbein.net> <20151222112653.GB21902@cicely7.cicely.de> Date: Tue, 22 Dec 2015 06:47:42 -0800 X-Google-Sender-Auth: zunnoc_9Gr4NCuYYoOs1pSxJvo4 Message-ID: Subject: Re: L2 cache management and busdma - or, "damnit USB, who you not like me" From: Adrian Chadd To: ticso@cicely.de Cc: Eugene Grosbein , "freebsd-mips@freebsd.org" Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-mips@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Porting FreeBSD to MIPS List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Dec 2015 14:47:44 -0000 On 22 December 2015 at 03:26, Bernd Walter wrote: > On Tue, Dec 22, 2015 at 12:12:55AM -0800, Adrian Chadd wrote: >> hi, >> >> It shouldn't be - the atheros mips doesn't have l2 cache. >> >> I wish I could reproduce your issue. :( > > It is strange that you couldn't reproduce the problem. > For me It happened on so many HW combinations of sticks and magnetic USB drive, > with different AR9331 boards and also with the WDR-4300. > On the other hand I know someone with a stable SATA-HDD on USB converter connected > to a Carambola2, which is something I couldn't reproduce. > Nevertheless, it is not a filesystem corruption thing. To me it is more suspect > to corruption in USB controller request memory and not in the bulk payload. > However, I have no evidence to proove this theory. When my living situation is saner I'll setup a proper test bench and test lots of combinations. :) -a >> On 21 December 2015 at 21:09, Eugene Grosbein wrote: >> > On 21.12.2015 12:02, Adrian Chadd wrote: >> >> hi, >> >> >> >> I've been poking at the ci20 port to bring it up to >> >> self-booting/running, and this involves using USB1 as a rootfs. Yeah, >> >> I know, ohci, but that's what I have for now. >> >> >> >> Anyway, there was filesystem corruption, so I went digging into it and >> >> found that we just weren't taking L2 cache line size into account when >> >> doing the busdma bits. The JZ4780 SoC has 32 byte L1 lines, and 128 >> >> byte L2 lines. Oops >> >> >> >> So, two things are needed: >> >> >> >> * for the ci20 port, which isn't in the mainline tree yet, we need to >> >> use USB_HOST_ALIGN=128, and >> >> * we need to teach the busdma code about the maximum line size, not >> >> just the L1 line size. >> >> >> >> Here's a diff that does the latter: >> >> >> >> https://people.freebsd.org/~adrian/mips/mips-fix-dcache-busdma.diff >> >> >> >> I'm going to test this out on my L1-only platforms (read: atheros) tomorrow. >> >> >> >> Does anyone have any comments? >> > >> > Can that be the source of my USB problems? Total system hang while doing lots of umass I/O >> > with TP-Link TL-WDR3600? If yes, I'd like to re-run my tests with these new patches. > > -- > B.Walter http://www.bwct.de > Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.