diff mbox series

[v5,3/7] PCI/VPD: Prevent VPD access for Amazon's Annapurna Labs Root Port

Message ID 20190905140018.5139-4-jonnyc@amazon.com
State Superseded
Delegated to: Lorenzo Pieralisi
Headers show
Series Amazon's Annapurna Labs DT-based PCIe host controller driver | expand

Commit Message

Chocron, Jonathan Sept. 5, 2019, 2 p.m. UTC 
The Amazon Annapurna Labs PCIe Root Port exposes the VPD capability,
but there is no actual support for it.

Trying to access the VPD (for example, as part of lspci -vv or when
reading the vpd sysfs file), results in the following warning print:

pcieport 0001:00:00.0: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update

Signed-off-by: Jonathan Chocron <jonnyc@amazon.com>
Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
 drivers/pci/vpd.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Andrew Murray Sept. 5, 2019, 2:22 p.m. UTC | #1 
On Thu, Sep 05, 2019 at 05:00:17PM +0300, Jonathan Chocron wrote:
> The Amazon Annapurna Labs PCIe Root Port exposes the VPD capability,
> but there is no actual support for it.
> 
> Trying to access the VPD (for example, as part of lspci -vv or when
> reading the vpd sysfs file), results in the following warning print:
> 
> pcieport 0001:00:00.0: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update
> 
> Signed-off-by: Jonathan Chocron <jonnyc@amazon.com>
> Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>

Reviewed-by: Andrew Murray <andrew.murray@arm.com>

> ---
>  drivers/pci/vpd.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> index 4963c2e2bd4c..7915d10f9aa1 100644
> --- a/drivers/pci/vpd.c
> +++ b/drivers/pci/vpd.c
> @@ -571,6 +571,12 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID,
>  		quirk_blacklist_vpd);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QLOGIC, 0x2261, quirk_blacklist_vpd);
> +/*
> + * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port
> + * device types, so 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_blacklist_vpd);
>  
>  /*
>   * For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
> -- 
> 2.17.1
>
Bjorn Helgaas Sept. 7, 2019, 4:55 p.m. UTC | #2 
On Thu, Sep 05, 2019 at 05:00:17PM +0300, Jonathan Chocron wrote:
> The Amazon Annapurna Labs PCIe Root Port exposes the VPD capability,
> but there is no actual support for it.

Oops.  Another oops for the device ID reuse mentioned below.

> Trying to access the VPD (for example, as part of lspci -vv or when
> reading the vpd sysfs file), results in the following warning print:
> 
> pcieport 0001:00:00.0: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update

Thanks for not wrapping the message (keeping it together makes it
easier to grep for).  Maybe indent it two spaces since it's quoted
material.

*Is* this a firmware defect?  E.g., could firmware disable this
capability so it doesn't appear in config space, as it apparently can
for the MSI-X capability?

> Signed-off-by: Jonathan Chocron <jonnyc@amazon.com>
> Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
>  drivers/pci/vpd.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> index 4963c2e2bd4c..7915d10f9aa1 100644
> --- a/drivers/pci/vpd.c
> +++ b/drivers/pci/vpd.c
> @@ -571,6 +571,12 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID,
>  		quirk_blacklist_vpd);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QLOGIC, 0x2261, quirk_blacklist_vpd);
> +/*
> + * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port
> + * device types, so 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_blacklist_vpd);
>  
>  /*
>   * For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
> -- 
> 2.17.1
>
Chocron, Jonathan Sept. 11, 2019, 3:01 p.m. UTC | #3 
On Sat, 2019-09-07 at 11:55 -0500, Bjorn Helgaas wrote:
> On Thu, Sep 05, 2019 at 05:00:17PM +0300, Jonathan Chocron wrote:
> > The Amazon Annapurna Labs PCIe Root Port exposes the VPD
> > capability,
> > but there is no actual support for it.
> 
> Oops.  Another oops for the device ID reuse mentioned below.
> 
> > Trying to access the VPD (for example, as part of lspci -vv or when
> > reading the vpd sysfs file), results in the following warning
> > print:
> > 
> > pcieport 0001:00:00.0: VPD access failed.  This is likely a
> > firmware bug on this device.  Contact the card vendor for a
> > firmware update
> 
> Thanks for not wrapping the message (keeping it together makes it
> easier to grep for).  

My thoughts exactly :) 

> Maybe indent it two spaces since it's quoted
> material.
> 
Will be done as part of v6.

> *Is* this a firmware defect?  E.g., could firmware disable this
> capability so it doesn't appear in config space, as it apparently can
> for the MSI-X capability?
> 
Yes, the FW could potentially disable it so it doesn't appear in the
config space.

In theory, VPD should be able to work if some other entity would listen
to the VPD requests and respond, but there are no plans to add support
for such an entity.

> > Signed-off-by: Jonathan Chocron <jonnyc@amazon.com>
> > Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> > ---
> >  drivers/pci/vpd.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> > index 4963c2e2bd4c..7915d10f9aa1 100644
> > --- a/drivers/pci/vpd.c
> > +++ b/drivers/pci/vpd.c
> > @@ -571,6 +571,12 @@
> > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f,
> > quirk_blacklist_vpd);
> >  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID,
> >  		quirk_blacklist_vpd);
> >  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QLOGIC, 0x2261,
> > quirk_blacklist_vpd);
> > +/*
> > + * The Amazon Annapurna Labs 0x0031 device id is reused for other
> > non Root Port
> > + * device types, so 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_blacklist_vpd);
> >  
> >  /*
> >   * For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
> > -- 
> > 2.17.1
> >
diff mbox series

Patch

diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index 4963c2e2bd4c..7915d10f9aa1 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -571,6 +571,12 @@  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID,
 		quirk_blacklist_vpd);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QLOGIC, 0x2261, quirk_blacklist_vpd);
+/*
+ * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port
+ * device types, so 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_blacklist_vpd);
 
 /*
  * For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the