linux-kernel - [PATCH 3.10 04/16] PCI: Limit config space size for Netronome NFP6000 family

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Message-Id: <1476917380-28311-5-git-send-email-w@1wt.eu>
Date:   Thu, 20 Oct 2016 00:49:28 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Jason S. McMullan" <jason.mcmullan@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 04/16] PCI: Limit config space size for Netronome NFP6000 family

From: "Jason S. McMullan" <jason.mcmullan@...ronome.com>

commit 9f33a2ae59f24452c1076749deb615bccd435ca9 upstream.

The NFP6000 has an erratum where reading/writing to PCI config space
addresses above 0x600 can cause the NFP to generate PCIe completion
timeouts.

Limit the NFP6000's config space size to 0x600 bytes.

Signed-off-by: Jason S. McMullan <jason.mcmullan@...ronome.com>
[simon: edited changelog]
Signed-off-by: Simon Horman <simon.horman@...ronome.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/pci/quirks.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 390e409..df1030c 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -292,6 +292,17 @@ static void quirk_citrine(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CITRINE,	quirk_citrine);
 
+/*
+ * This chip can cause bus lockups if config addresses above 0x600
+ * are read or written.
+ */
+static void quirk_nfp6000(struct pci_dev *dev)
+{
+	dev->cfg_size = 0x600;
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NETRONOME,	PCI_DEVICE_ID_NETRONOME_NFP6000,	quirk_nfp6000);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NETRONOME,	PCI_DEVICE_ID_NETRONOME_NFP6000_VF,	quirk_nfp6000);
+
 /*  On IBM Crocodile ipr SAS adapters, expand BAR to system page size */
 static void quirk_extend_bar_to_page(struct pci_dev *dev)
 {
-- 
2.8.0.rc2.1.gbe9624a