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PCI: SR-IOV quirk for Intel 82576 NIC

Message ID 1238463633-11071-1-git-send-email-yu.zhao@intel.com
State Superseded, archived
Headers show

Commit Message

Yu Zhao March 31, 2009, 1:40 a.m. UTC
If BIOS doesn't allocate resources for the SR-IOV BARs, zero the Flash
BAR and program the SR-IOV BARs to use the old Flash Memory Space.

Please refer to Intel 82576 Gigabit Ethernet Controller Datasheet
section 7.9.2.14.2 for details.
http://download.intel.com/design/network/datashts/82576_Datasheet.pdf

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
---
 drivers/pci/quirks.c |   50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 50 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 92b9efe..6e145d4 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2268,6 +2268,56 @@  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4375,
 
 #endif /* CONFIG_PCI_MSI */
 
+#ifdef CONFIG_PCI_IOV
+
+/*
+ * For Intel 82576 SR-IOV NIC, if BIOS doesn't allocate resources for the
+ * SR-IOV BARs, zero Flash BAR and program the SR-IOV BARs to use the old
+ * Flash Memory Space. PCI subsystem may try to allocate Memory Space for
+ * Flash BAR later, that's why we don't clear Flash BAR flags.
+ */
+static void __devinit intel_82576_quirk(struct pci_dev *dev)
+{
+	int pos, flags;
+	u32 bar, start, size;
+
+	if (PAGE_SIZE > 0x10000)
+		return;
+
+	flags = pci_resource_flags(dev, 0);
+	if ((flags & PCI_BASE_ADDRESS_SPACE) !=
+			PCI_BASE_ADDRESS_SPACE_MEMORY ||
+	    (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) !=
+			PCI_BASE_ADDRESS_MEM_TYPE_32)
+		return;
+
+	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
+	if (!pos)
+		return;
+
+	pci_read_config_dword(dev, pos + PCI_SRIOV_BAR, &bar);
+	if (bar & PCI_BASE_ADDRESS_MEM_MASK)
+		return;
+
+	start = pci_resource_start(dev, 1);
+	size = pci_resource_len(dev, 1);
+	if (!start || size != 0x400000 || start & (size - 1))
+		return;
+
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
+	pci_resource_start(dev, 1) = 0;
+	pci_resource_end(dev, 1) = size - 1;
+	pci_write_config_dword(dev, pos + PCI_SRIOV_BAR, start);
+	pci_write_config_dword(dev, pos + PCI_SRIOV_BAR + 12, start + size / 2);
+
+	dev_info(&dev->dev, "use Flash Memory Space for SR-IOV BARs\n");
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x10c9, intel_82576_quirk);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x10e6, intel_82576_quirk);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x10e7, intel_82576_quirk);
+
+#endif	/* CONFIG_PCI_IOV */
+
 static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
 			  struct pci_fixup *end)
 {