Messages in this thread | | | Date | Mon, 28 Jan 2013 11:01:56 +0000 | From | Chris Clayton <> | Subject | Re: 3.8.0-rc4+ - Oops on removing WinTV-HVR-1400 expresscard TV Tuner |
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[no one screamed, so linux-media ml dropped]
Hi Martin,
On 01/28/13 10:56, Martin Mokrejs wrote: > > > Chris Clayton wrote: >> Hi Yijing, >> >> On 01/28/13 02:40, Yijing Wang wrote: >>> Hi Chris, >>> Sorry for the delay reply. It seems like my reply last night was missed. >>> >>> From the sysinfo you provide, there are no pcie port devices under /sys/bus/pci_express/devices. >>> Maybe because there are some problems with _OSC in your laptop, so pcie port driver won't create pcie port device >>> for hotplug, aer and so on. >>> >>> Maybe you can add boot parameter "pcie_ports=native" and reboot your laptop. >>> Then use #modprobe pciehp pciehp_force=1 pciehp_debug=1 to load pciehp modules. >>> After above actions, enter /sys/bus/pci_express/devices/ directory and /sys/bus/pci/slots/ >>> Some slots and pcie port devices should be there now. >>> >> Sorry, I've tried your suggestion, but the two directories are still empty. >> >> I verified the test environment as follows: >> >> [chris:~]$ uname -a >> Linux laptop 3.7.4 #15 SMP PREEMPT Mon Jan 28 09:43:57 GMT 2013 i686 GNU/Linux >> [chris:~]$ grep acpiphp /boot/System.map-3.7.4 >> [chris:~]$ modinfo acpiphp >> modinfo: ERROR: Module acpiphp not found. >> [chris:~]$ modinfo pciehp >> filename: /lib/modules/3.7.4/kernel/drivers/pci/hotplug/pciehp.ko >> license: GPL >> description: PCI Express Hot Plug Controller Driver >> author: Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com> >> depends: >> intree: Y >> vermagic: 3.7.4 SMP preempt mod_unload CORE2 >> parm: pciehp_detect_mode:Slot detection mode: pcie, acpi, auto >> pcie - Use PCIe based slot detection >> acpi - Use ACPI for slot detection >> auto(default) - Auto select mode. Use acpi option if duplicate >> slot ids are found. Otherwise, use pcie option >> (charp) >> parm: pciehp_debug:Debugging mode enabled or not (bool) >> parm: pciehp_poll_mode:Using polling mechanism for hot-plug events or not (bool) >> parm: pciehp_poll_time:Polling mechanism frequency, in seconds (int) >> parm: pciehp_force:Force pciehp, even if OSHP is missing (bool) >> [chris:~]$ cat /proc/cmdline >> root=/dev/sda5 pciehp_ports=native ro resume=/dev/sda6 >> [chris:~]$ sudo modprobe pciehp pciehp_force=1 pciehp_debug=1 >> [chris:~]$ lsmod >> Module Size Used by >> pciehp 19907 0 >> [...] >> >> You will notice that the kernel I have used is 3.7.4. I hope that's a suitable kernel for your tests. I've moved away from the 3.8 development kernel onto one that's stable and on which Martin has identified a solution. I see Greg KH released 3.7.5 yesterday and it includes a pciehp change. I'll upgrade to that, run the tests again and report back. >> >> One question - should I include the (acpi) pci_slot driver in the kernel build or does pciehp populate the directories without pci_slot? > > Hi Chris, > I am not a kernel developer but from the other threads at linux-pci I gathered there are in some > scenarios problems with improper loading of the hotplug modules. Therefore, the patches floating > now around are to disable hotplug module availability. Therefore, I suggested you to try only > only static kernel support for hotplug. That way you don't hit the issue. That is for sure not > addressed in 3.7.5, seems that it is probably in -next. > Martin > In a few minutes I'll be sending out another reply to Yijing's suggestions because I noticed a typo in the parameter I added to the kernel command line. I'm now going back through email to remember why we were trying to get those /sys/bus/pci... directories populated.
Watch this space! :-) Chris
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