linux-kernel - Re: [PATCH v1 3/7] PCI: New Primary to Sideband (P2SB) bridge support library

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Message-ID: <3f33a178-3002-e93e-89f1-8cf05097da25@metux.net>
Date:   Fri, 2 Apr 2021 15:09:12 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Henning Schild <henning.schild@...mens.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.de>,
        Lee Jones <lee.jones@...aro.org>,
        Tan Jui Nee <jui.nee.tan@...el.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Jonathan Yong <jonathan.yong@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pci@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Peter Tyser <ptyser@...-inc.com>, hdegoede@...hat.com
Subject: Re: [PATCH v1 3/7] PCI: New Primary to Sideband (P2SB) bridge support
 library

On 09.03.21 09:42, Henning Schild wrote:

> The device will respond to MMIO while being hidden. I am afraid nothing
> stops a collision, except for the assumption that the BIOS is always
> right and PCI devices never get remapped. But just guessing here.

What could go wrong if it is remapped, except that this driver would
write to the wrong mmio space ?

If it's unhidden, pci-core should see it and start the usual probing,
right ?


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287