Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754296AbaDOKEe (ORCPT ); Tue, 15 Apr 2014 06:04:34 -0400 Received: from www84.your-server.de ([213.133.104.84]:49058 "EHLO www84.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754263AbaDOKEa (ORCPT ); Tue, 15 Apr 2014 06:04:30 -0400 Date: Tue, 15 Apr 2014 12:04:17 +0200 Message-ID: <20140415120417.Horde.2gdC8Woe64OQXOq_cVqtkg6@webmail.your-server.de> From: stefani@seibold.net To: Thadeu Lima de Souza Cascardo Cc: Benjamin Herrenschmidt , linux-usb , linux-kernel@vger.kernel.org, Greg KH , Alan Stern , sarah.a.sharp@linux.intel.com Subject: Re: Missing USB XHCI and EHCI reset for kexec References: <1397416959.1555.30.camel@vger.seibold.net> <1397468521.9258.28.camel@pasglop> <20140414174458.Horde.ieyRX8PcZ0lg3nY1QFE2DA4@webmail.your-server.de> <20140414214807.GA32141@oc0268524204.ibm.com> In-Reply-To: <20140414214807.GA32141@oc0268524204.ibm.com> User-Agent: Internet Messaging Program (IMP) H5 (6.1.7) Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes MIME-Version: 1.0 Content-Disposition: inline X-Authenticated-Sender: stefani@seibold.net Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Zitat von Thadeu Lima de Souza Cascardo : > On Mon, Apr 14, 2014 at 05:44:58PM +0200, stefani@seibold.net wrote: >> >> Zitat von Benjamin Herrenschmidt : >> >> >I don't know about EHCI specifically but this is a known issue with >> >XHCI, I observe similar issues on other powerpc platforms (servers) >> >and this isn't architecture specific (looks more like actualy xhc >> >implementation specific). >> > >> >Thadeu Cascardo (on CC) has been the one investigating that on our side, >> >he might have more to add including patches. >> > >> >> I have now a kernel 3.14 dmesg log of the problem. After a kexec the >> kexeced 3.14 kernel shows: >> >> [ 1.170029] xhci_hcd 0001:03:00.0: xHCI Host Controller >> [ 1.175306] xhci_hcd 0001:03:00.0: new USB bus registered, >> assigned bus number 1 >> [ 1.212561] xhci_hcd 0001:03:00.0: Host not halted after 16000 >> microseconds. >> [ 1.219621] xhci_hcd 0001:03:00.0: can't setup: -110 >> [ 1.224597] xhci_hcd 0001:03:00.0: USB bus 1 deregistered >> [ 1.230021] xhci_hcd 0001:03:00.0: init 0001:03:00.0 fail, -110 >> [ 1.235955] xhci_hcd: probe of 0001:03:00.0 failed with error -110 >> > > What is your controller vendor and device IDs? Is that a TI chip? > Yes it is a TI chip, vendor ID 104c and product ID 8241. > Can you check if the patch I sent a month ago fixes it? [1] There's the > whole story there. In fact, you will also need something like the patch > below. Can you apply only the first one, verify, and, then, the other > one as well, and report what worked for you? > > [1] http://marc.info/?l=linux-usb&m=139483181809062&w=2 > I tried the attach patch and it did not help. This is what i expected because this is a fix in the shutdown path, which will never called when doing a forced kexec. I have a running a 3.10.23 kernel. This kernel do a kexec for a kernel 3.14. Since the kernel 3.10.23 did not performe a clean shutdown, the state of the XHCI Controller is undefined. So when kernel 3.14 will probe XHCI it will find a XHCI controller which was not performed a reset. So i think it is necessary to reset the XHCI controller and all devices on this bus. This is what i do with a "echo 1 >/sys/bus/pci/drivers/xhci_hcd/0001:03:00.0/reset" before the kexec. - Stefani -- 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/