[PATCH 4.4 020/113] PCI: Limit config space size for Netronome NFP6000 family

Greg Kroah-Hartman
2016-09-05T16:49:29Z

From: Jason S. McMullan <jason.mcmullan@netronome.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@netronome.com>
[simon: edited changelog]
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/pci/quirks.c | 11 +++++++++++
1 file changed, 11 insertions(+)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -287,6 +287,17 @@ static void quirk_citrine(struct pci_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)
{