linux-kernel - Re: [PATCH 04/11] PCI: pci-bridge-emul: Add support for new flag PCI_BRIDGE_EMUL_NO_IO

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Message-ID: <20211221164220.33d1589a@windsurf>
Date:   Tue, 21 Dec 2021 16:42:20 +0100
From:   Thomas Petazzoni <thomas.petazzoni@...tlin.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        "Rob Herring" <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        Marek Behún <kabel@...nel.org>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] PCI: pci-bridge-emul: Add support for new flag
 PCI_BRIDGE_EMUL_NO_IO_FORWARD

On Tue, 21 Dec 2021 15:14:48 +0100
Pali Rohár <pali@...nel.org> wrote:

> Like PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD, this new flag specifies that
> emulated PCI bridge does not support forwarding of IO requests in given
> range between primary and secondary buses. This flag should be used as
> argument for pci_bridge_emul_init() for hardware setup without IO support.
> 
> Setting this flag cause that IO base and limit registers are read-only.
> 
> Signed-off-by: Pali Rohár <pali@...nel.org>

Looks good. As said on PATCH 03/11, perhaps just a snippet of
documentation in pci-bridge-emul.h to describe the semantic of the new
flag.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com