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Commit 7eb93b17 authored by Yu Zhao's avatar Yu Zhao Committed by Jesse Barnes
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PCI: SR-IOV quirk for Intel 82576 NIC 

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: default avatarYu Zhao <yu.zhao@intel.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 0221c81b

drivers/pci/quirks.c

+48 −0
Original line number Diff line number Diff line
@@ -2411,6 +2411,54 @@ 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 the Flash BAR and program the SR-IOV BARs to use the

 * old Flash Memory Space.

 */

static void __devinit quirk_i82576_sriov(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_resource_flags(dev, 1) = 0;

	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);

	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, quirk_i82576_sriov);

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x10e6, quirk_i82576_sriov);

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x10e7, quirk_i82576_sriov);



#endif	/* CONFIG_PCI_IOV */



static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,

			  struct pci_fixup *end)

{