linux-kernel - Re: [RFC 01/32] Kconfig: introduce and depend on LEGACY

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Message-ID: <20220106181409.GA297735@bhelgaas>
Date:   Thu, 6 Jan 2022 12:14:09 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
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Subject: Re: [RFC 01/32] Kconfig: introduce and depend on LEGACY_PCI

On Thu, Jan 06, 2022 at 05:41:00PM +0000, John Garry wrote:
> On 05/01/2022 19:47, Bjorn Helgaas wrote:

> > IMO inb() should
> > be present but do something innocuous like return ~0, as it would if
> > I/O port space is supported but there's no device at that address.
> > 
> > [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/scsi/megaraid.c?id=v5.15#n4210
> > 
> 
> That driver would prob not be used on systems which does not support PIO,
> and so could have a HAS_IOPORT dependency. But it is not strictly necessary.

I don't want the path of "this driver isn't needed because the device
is unlikely to be used on this arch."

Maybe it's not _always_ possible, but if the device can be plugged
into the platform, I think we should be able to build the driver for
it.

If the device requires I/O port space and the platform doesn't support
it, the PCI core or the driver should detect that and give a useful
diagnostic.

Bjorn