linux-kernel - Re: [PATCH v2 3/3] PCI: imx6: limit DBI register length

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Message-ID: <1542724621.2508.16.camel@pengutronix.de>
Date:   Tue, 20 Nov 2018 15:37:01 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Stefan Agner <stefan@...er.ch>, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, tpiepho@...inj.com
Cc:     bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] PCI: imx6: limit DBI register length

Am Dienstag, den 20.11.2018, 14:27 +0100 schrieb Stefan Agner:
> Define the length of the DBI registers. This makes sure that
> the kernel does not access registers beyond that point, avoiding
> the following abort on a i.MX 6Quad:
>   # cat /sys/devices/soc0/soc/1ffc000.pcie/pci0000\:00/0000\:00\:00.0/config
>   [  100.021433] Unhandled fault: imprecise external abort (0x1406) at 0xb6ea7000
>   ...
>   [  100.056423] PC is at dw_pcie_read+0x50/0x84
>   [  100.060790] LR is at dw_pcie_rd_own_conf+0x44/0x48
>   ...
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 7ac1a639fe91..41d6127b40ad 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -41,6 +41,7 @@ enum imx6_pcie_variants {
>  
>  struct imx6_pcie_drvdata {
> >  	enum imx6_pcie_variants variant;
> > > +	int			dbi_length;
>  };
>  
>  struct imx6_pcie {
> @@ -779,6 +780,8 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  		break;
> >  	}
>  
> > +	pci->dbi_length = imx6_pcie->drvdata->dbi_length;
> +
> >  	/* Grab GPR config register range */
> >  	imx6_pcie->iomuxc_gpr =
> >  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -839,7 +842,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  }
>  
>  static const struct imx6_pcie_drvdata drvdata[] = {
> > -	[IMX6Q] = { .variant = IMX6Q },
> > +	[IMX6Q] = { .variant = IMX6Q, .dbi_length = 0x15c },
> >  	[IMX6SX] = { .variant = IMX6SX },
> >  	[IMX6QP] = { .variant = IMX6QP },
> >  	[IMX7D] = { .variant = IMX7D },