linux-kernel - RE: [PATCH 3/7] PCI: Distribute available buses to hotplug capable PCIe downstream ports

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DD0092407@AcuExch.aculab.com>
Date:   Thu, 12 Oct 2017 09:50:31 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Bjorn Helgaas' <helgaas@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        "Mario.Limonciello@...l.com" <Mario.Limonciello@...l.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/7] PCI: Distribute available buses to hotplug capable
 PCIe downstream ports

From: Bjorn Helgaas
> Sent: 12 October 2017 00:33
> Why do you limit it to PCIe?  Isn't it conceivable that one could
> hot-add a conventional PCI card that contained a bridge leading to
> another hotplug slot?  E.g., a PCI card with PCMCIA slot or something
> on it?

There are (maybe were!) cardbus cards that contained PCI bridges to
connect to expansion chassis.
Bus enumeration was always a problem unless they were connected
at boot time.

	David