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From:   Jonathan Chocron <jonnyc@amazon.com>
To:     <lorenzo.pieralisi@arm.com>, <bhelgaas@google.com>,
        <jingoohan1@gmail.com>, <gustavo.pimentel@synopsys.com>,
        <robh+dt@kernel.org>, <mark.rutland@arm.com>
CC:     <andrew.murray@arm.com>, <dwmw@amazon.co.uk>,
        <benh@kernel.crashing.org>, <alisaidi@amazon.com>,
        <ronenk@amazon.com>, <barakw@amazon.com>, <talel@amazon.com>,
        <hanochu@amazon.com>, <hhhawa@amazon.com>,
        <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <jonnyc@amazon.com>
Subject: [PATCH v6 3/7] PCI/VPD: Prevent VPD access for Amazon's Annapurna Labs Root Port
Date:   Thu, 12 Sep 2019 16:00:41 +0300
Message-ID: <20190912130042.14597-4-jonnyc@amazon.com>
In-Reply-To: <20190912130042.14597-1-jonnyc@amazon.com>
References: <20190912130042.14597-1-jonnyc@amazon.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
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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>
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