On Thu, Mar 15, 2012 at 12:01 PM, Yinghai Lu [off-list ref] wrote:

On Thu, Mar 15, 2012 at 10:53 AM, Bjorn Helgaas [off-list ref] wrote:

quoted

Sure, the 'echo "\_SB.PCIB 3" > /proc/acpi/sci/notify' way looks more
like physical hotadd/remove because it is basically injecting the
notify event that the hardware/BIOS should be generating itself.  But
it is platform-specific and therefore unacceptable as a general user
interface.

Using /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/remove would be a
more generic way.  The PNP0A08:00/remove implementation would
basically turn into an acpi_pci_root_remove() call, just like the
'echo "\_SB.PCIB 3" > /proc/acpi/sci/notify' does.

if the users can not find _SB.PCIB etc, they may not find
LNXSYSTM:00/device:00/PNP0A08:00.

so /sys/class/pci_bus/0000:80/remove is more easy for them?

I don't think so.  LNXSYSTM:00/... is the canonical machine
description on x86.  I think there should probably be a link from the
PCI device to the upstream bridge.  The upstream bridge could be
either a P2P bridge or a host bridge.

Bjorn