Re: [PATCH v2 24/37] PCI, ACPI: Add pci_root_hp hot removalnotification support.

[Bjorn Helgaas]

On Thu, Mar 15, 2012 at 12:01 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Thu, Mar 15, 2012 at 10:53 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
>> 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
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