linux-kernel - RE: [PATCH v2 3/8] PCI/VPD: Add VPD release quirk for Amazon's Annapurna Labs Root Port

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Date:   Fri, 19 Jul 2019 08:24:30 +0000
From:   Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
To:     Jonathan Chocron <jonnyc@...zon.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "gustavo.pimentel@...opsys.com" <Gustavo.Pimentel@...opsys.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>
CC:     "dwmw@...zon.co.uk" <dwmw@...zon.co.uk>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "alisaidi@...zon.com" <alisaidi@...zon.com>,
        "ronenk@...zon.com" <ronenk@...zon.com>,
        "barakw@...zon.com" <barakw@...zon.com>,
        "talel@...zon.com" <talel@...zon.com>,
        "hanochu@...zon.com" <hanochu@...zon.com>,
        "hhhawa@...zon.com" <hhhawa@...zon.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v2 3/8] PCI/VPD: Add VPD release quirk for Amazon's
 Annapurna Labs Root Port

On Thu, Jul 18, 2019 at 10:45:26, Jonathan Chocron <jonnyc@...zon.com> 
wrote:

> The Amazon Annapurna Labs PCIe Root Port exposes the VPD capability,
> but there is no actual support for it.
> 
> The reason for not using the already existing quirk_blacklist_vpd()
> is that, although this fails pci_vpd_read/write, the 'vpd' sysfs
> entry still exists. When running lspci -vv, for example, this
> results in the following error:
> 
> pcilib: sysfs_read_vpd: read failed: Input/output error
> 
> This quirk removes the sysfs entry, which avoids the error print.
> 
> Signed-off-by: Jonathan Chocron <jonnyc@...zon.com>
> ---
>  drivers/pci/vpd.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> index 4963c2e2bd4c..c23a8ec08db9 100644
> --- a/drivers/pci/vpd.c
> +++ b/drivers/pci/vpd.c
> @@ -644,4 +644,20 @@ static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID,
>  			quirk_chelsio_extend_vpd);
>  
> +static void quirk_al_vpd_release(struct pci_dev *dev)
> +{
> +	if (dev->vpd) {
> +		pci_vpd_release(dev);
> +		dev->vpd = NULL;
> +		pci_warn(dev, FW_BUG "Releasing VPD capability (No support for VPD read/write transactions)\n");
> +	}
> +}
> +
> +/*
> + * The 0031 device id is reused for other non Root Port device types,
> + * therefore the quirk is registered for the PCI_CLASS_BRIDGE_PCI class.
> + */
> +DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
> +			      PCI_CLASS_BRIDGE_PCI, 8, quirk_al_vpd_release);
> +
>  #endif
> -- 
> 2.17.1

Seems ok.

Reviewed-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>