linux-kernel - RE: [PATCH v2] PCI: imx6: Limit DBI register length for imx6qp PCIe

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Date:   Tue, 22 Jun 2021 00:41:28 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "kw@...ux.com" <kw@...ux.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: RE: [PATCH v2] PCI: imx6: Limit DBI register length for imx6qp PCIe

> -----Original Message-----
> From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Sent: Monday, June 21, 2021 10:24 PM
> To: Richard Zhu <hongxing.zhu@....com>
> Cc: l.stach@...gutronix.de; kw@...ux.com; bhelgaas@...gle.com;
> stefan@...er.ch; linux-pci@...r.kernel.org; dl-linux-imx
> <linux-imx@....com>; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de
> Subject: Re: [PATCH v2] PCI: imx6: Limit DBI register length for imx6qp PCIe
> 
> On Sat, Feb 20, 2021 at 10:49:48AM +0800, Richard Zhu wrote:
> > Define the length of the DBI registers and limit config space to its
> > length. This makes sure that the kernel does not access registers
> > beyond that point that otherwise would lead to an abort on the i.MX
> 6QuadPlus.
> >
> > See commit 075af61c19cd ("PCI: imx6: Limit DBI register length") that
> > resolves a similar issue on the i.MX 6Quad PCIe.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> > Reviewed-by: Krzysztof Wilczyński <kw@...ux.com>
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 1 +
> >  1 file changed, 1 insertion(+)
> 
> I'd like to merge this patch since I believe it is still required, please let me
> know if that's not the case.
Hi Lorenzo:
Thanks for merging this patch.

Best Regards
Richard Zhu
> 
> Lorenzo
> 
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 0cf1333c0440..853ea8e82952 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -1175,6 +1175,7 @@ static const struct imx6_pcie_drvdata drvdata[] =
> {
> >  		.variant = IMX6QP,
> >  		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
> >  			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
> > +		.dbi_length = 0x200,
> >  	},
> >  	[IMX7D] = {
> >  		.variant = IMX7D,
> > --
> > 2.17.1
> >