RE: Fwd: Need some help with pciehp hot-plug driver

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> -----Original Message-----
> From: linux-pci-owner@xxxxxxxxxxxxxxx [mailto:linux-pci-
> owner@xxxxxxxxxxxxxxx] On Behalf Of vidya sagar
> Sent: Wednesday, July 06, 2016 02:53
> To: linux-pci@xxxxxxxxxxxxxxx
> Subject: Fwd: Need some help with pciehp hot-plug driver
> 
> Hi,
> I was going through the video
> https://www.youtube.com/watch?v=oCJOkoRvsSk and at 3:00 , it is
> mentioned that hot-plugging a switch is not supported by pciehp as of
> that date. Would like to know if it is supported in 3.18 or 4.4
> versions? I'm looking for pciehp support on an ARM platform and it
> doesn't have any ACPI.

Hot plugging a switch is mostly unsupported in any current Linux kernel. Although the PCI subsystem can reserve addresses for hotplug BARs, it does not reserve any secondary bus numbers for potential hotplug switches. See the discussion beginning at http://comments.gmane.org/gmane.linux.kernel.pci/45210.

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