Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932223Ab3COWsz (ORCPT ); Fri, 15 Mar 2013 18:48:55 -0400 Received: from mail-oa0-f51.google.com ([209.85.219.51]:37325 "EHLO mail-oa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755223Ab3COWsy (ORCPT ); Fri, 15 Mar 2013 18:48:54 -0400 MIME-Version: 1.0 In-Reply-To: References: <51016937.1020202@googlemail.com> <5104427D.2050002@googlemail.com> <510494D6.1010000@gmail.com> <51050D43.2050703@googlemail.com> <51051B1B.3080105@gmail.com> <51052DB2.4090702@googlemail.com> <51053917.6060400@fold.natur.cuni.cz> <5105491E.9050907@googlemail.com> <510558CE.9000600@fold.natur.cuni.cz> <5105AFDB.9000200@googlemail.com> <5105E51D.2020606@huawei.com> <51064F1A.1020909@googlemail.com> <51065FA6.4070208@googlemail.com> <51066B46.10409@fold.natur.cuni.cz> <5106CD6C.4070009@googlemail.com> <5106E770.9070602@fold.natur.cuni.cz> <510A5F0E.6010100@googlemail.com> <5138C03C.8080600@googlemail.com> <5138F6B6.8050208@googlemail.com> <5139C0F7.9030907@googlemail.com> <513AFECB.40409@googlemail.com> From: Bjorn Helgaas Date: Fri, 15 Mar 2013 16:48:33 -0600 Message-ID: Subject: Re: 3.8.0-rc4+ - Oops on removing WinTV-HVR-1400 expresscard TV Tuner To: Chris Clayton Cc: Martin Mokrejs , Yijing Wang , Yijing Wang , LKML , "linux-pci@vger.kernel.org" , "Rafael J. Wysocki" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2431 Lines: 59 On Tue, Mar 12, 2013 at 4:20 PM, Bjorn Helgaas wrote: > On Sat, Mar 9, 2013 at 2:20 AM, Chris Clayton wrote: >> On 03/08/13 22:57, Bjorn Helgaas wrote: >>> Thanks. I opened this bug report: >>> https://bugzilla.kernel.org/show_bug.cgi?id=54981 to keep track of >>> your logs. Hi Chris, The current Linux acpiphp driver doesn't do anything unless it finds devices with _EJ0 or _RMV methods, and your DSDT has neither. But I think that implementation is incorrect because I'm not convinced that those methods are required in order to do hotplug via ACPI. For example, your DSDT *does* have an _L01 method that does notifications to the root ports. I suspect that hotplug events on your box generate an SCI that invokes that method. Linux basically ignores the resulting notify events, and I suspect that hotplug works on Windows because it is paying attention to them. Can you build a kernel with CONFIG_ACPI_DEBUG=y, do the following, and attach all the output to the bugzilla? 1) Boot with empty ExpressCard slot (without using "pcie_ports=native") 2) # echo 0x00010004 > /sys/module/acpi/parameters/debug_layer 3) # echo 0x08000004 > /sys/module/acpi/parameters/debug_level 4) # lspci -vv 5) # setpci -s 1c.3 0x42.w 6) # setpci -s 1c.3 0x5a.w 7) # setpci -s 1c.3 0xd8.l 8) Insert ExpressCard 9) # setpci -s 1c.3 0x5a.w 10) # dmesg Here's what I think we'll see: - Slot Implemented (bit 8 of XCAP at 0x42) set, indicating a slot is implemented below this root port - Hot Plug SCI Enable (bit 30 of MPC at 0xd8) set, indicating that the root port should generate an SCI whenever a hotplug event is detected - Presence Detect State (bit 6 of SLTSTS at 0x5a) change from 0 with the slot empty to 1 with the slot occupied - pciehp doing nothing (since _OSC didn't grant the OS permission to use PCIe native hotplug) - dmesg indication of the SCI, leading to a Bus Check notification to \_SB.PCI0.RP04, which is the 1c.3 root port leading to the ExpressCard slot A Bus Check notification means we're supposed to re-enumerate starting at that device. If we *did* re-enumerate, we would find the new ExpressCard. Thanks, Bjorn -- 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/