Re: Cabled PCIE device hotplug/hot-removal

[Greg KH <greg@kroah.com>]

On Sun, Jul 29, 2012 at 03:36:09PM +0300, Shlomo Pongratz wrote:
> On Thu, Jul 26, 2012 at 8:09 PM, Greg KH <greg@kroah.com> wrote:
> > On Thu, Jul 26, 2012 at 08:03:09PM +0300, Shlomo Pongratz wrote:
> >> Hi,
> >>
> >> I have a  PCIe device connected with cables to a host (kernel 3.5.0-rc7+).
> >> What are the handler I need to add to a driver in order to catch cable
> >> pull-out / push-in?
> >
> > You shouldn't need anything special, aren't you already getting probe
> > and disconnect callbacks when the device is discovered and removed?
> 
> When the device is loaded the probe is called
> When I "echo 1" to the remove sysfs entry the remove callback is called.
> But when I power down the card no callback is called.

Then I would blame your pci hotplug controller, that is its
responsibility.

> >> The pcisig presentation
> >> "http://www.pcisig.com/developers/main/training_materials/get_document?doc_idôca40ec1721aa7fadd05e2903b0172c36656294"
> >> talks about PERST# detection for cabled PCIe hotplug.
> >>
> >> Does the kernel detect it?
> >>
> >> None of the pci_driver or pci_error_handlers callbacks were called
> >> when using powered down/up the device (electrically).
> >
> > Do you have the pciehp driver loaded properly when this happens?
> 
> My {dot}config includes it into the kernel, i.e.
> CONFIG_HOTPLUG_PCI_PCIE=y

And is it working properly?  Does your hardware support this (i.e. your
BIOS?)

greg k-h