[Xen-changelog] [linux-2.6.18-xen] PCI: add a SR-IOV quirk for Intel 82576 NIC

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1237458059 0
# Node ID 3d4c92b975561298238ab6e402eb05afbf288870
# Parent  6a0fee3b8b7da9e2aec96ee6807df5684218d6e4
PCI: add a SR-IOV quirk for Intel 82576 NIC

If BIOS doesn't allocate resources for VF BARs, zero Flash BAR and
program VF 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@xxxxxxxxx>
---
 drivers/pci/quirks.c |   57 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 57 insertions(+)

diff -r 6a0fee3b8b7d -r 3d4c92b97556 drivers/pci/quirks.c
--- a/drivers/pci/quirks.c      Thu Mar 19 10:07:31 2009 +0000
+++ b/drivers/pci/quirks.c      Thu Mar 19 10:20:59 2009 +0000
@@ -1747,3 +1747,60 @@ EXPORT_SYMBOL(pcie_mch_quirk);
 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pci_fixup_device);
 #endif
+
+#ifdef CONFIG_PCI_IOV
+/*
+ * If BIOS doesn't allocate resources for SR-IOV BARs, zero Flash BAR
+ * and program 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 i, flags;
+       u32 bar, start, size;
+
+       if (PAGE_SIZE > 0x10000)
+               return;
+
+       if (pci_read_config_dword(dev, 0x184, &bar))
+               return;
+
+       if (bar & PCI_BASE_ADDRESS_MEM_MASK)
+               return;
+
+       i = 1;
+       flags = pci_resource_flags(dev, i);
+       if ((flags & PCI_BASE_ADDRESS_SPACE) ==
+                       PCI_BASE_ADDRESS_SPACE_MEMORY &&
+           (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
+                       PCI_BASE_ADDRESS_MEM_TYPE_32)
+               goto found;
+
+       i = 2;
+       flags = pci_resource_flags(dev, i);
+       if ((flags & PCI_BASE_ADDRESS_SPACE) ==
+                       PCI_BASE_ADDRESS_SPACE_MEMORY &&
+           (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
+                       PCI_BASE_ADDRESS_MEM_TYPE_64)
+               goto found;
+
+       return;
+found:
+       start = pci_resource_start(dev, i);
+       size = pci_resource_len(dev, i);
+       if (!start || size != 0x400000 || start & (size - 1))
+               return;
+
+       pci_write_config_dword(dev, 0x10 + i * 4, 0);
+       pci_resource_start(dev, i) = 0;
+       pci_resource_end(dev, i) = size - 1;
+       pci_write_config_dword(dev, 0x184, start);
+       pci_write_config_dword(dev, 0x190, 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 */

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