linux-kernel - Re: [PATCH 3/8] PCI/VPD: Add VPD release quirk for Amazon Annapurna Labs host bridge

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Message-ID: <20190712131008.GC46935@google.com>
Date:   Fri, 12 Jul 2019 08:10:08 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jonathan Chocron <jonnyc@...zon.com>
Cc:     lorenzo.pieralisi@....com, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, robh+dt@...nel.org,
        mark.rutland@....com, dwmw@...zon.co.uk, benh@...nel.crashing.org,
        alisaidi@...zon.com, ronenk@...zon.com, barakw@...zon.com,
        talel@...zon.com, hanochu@...zon.com, hhhawa@...zon.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 3/8] PCI/VPD: Add VPD release quirk for Amazon Annapurna
 Labs host bridge

On Thu, Jul 11, 2019 at 05:55:56PM +0300, Jonathan Chocron wrote:
> The Amazon Annapurna Labs pcie host bridge exposes the VPD capability,
> but there is no actual support for it.

s/pcie/PCIe/
s/host bridge/Root Port/

> 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 | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> index 4963c2e2bd4c..b594b2895ffe 100644
> --- a/drivers/pci/vpd.c
> +++ b/drivers/pci/vpd.c
> @@ -644,4 +644,16 @@ 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 "Annapurna Labs pcie quirk - Releasing VPD capability (No support for VPD read/write transactions)\n");

The "Annapurna Labs pcie quirk" text is superfluous.

> +	}
> +}
> +
> +DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
> +			      PCI_CLASS_BRIDGE_PCI, 8, quirk_al_vpd_release);

Why DECLARE_PCI_FIXUP_CLASS_FINAL()?  See comments on the MSI-X quirk
patch.

> +
>  #endif
> -- 
> 2.17.1
> 
>