Commit 0a3d00b3 authored Feb 09, 2016 by Kelly Zytaruk Committed by Bjorn Helgaas Feb 29, 2016

PCI: Support SR-IOV on any function type

Previously, we only supported SR-IOV on PCI Express Endpoints and Root
Complex Integrated Endpoints.  This restriction has been present since
d1b054da ("PCI: initialize and release SR-IOV capability") added SR-IOV
support, but the spec does not require it.  In fact, the SR-IOV spec r1.1,
sec 3.3, says the SR-IOV extended capability may be present for any Type 0
function.

Remove the function type test, so we can support SR-IOV on any function.

Some AMD GPUs have display outputs, use the VGA class code, are Legacy
Endpoints, and support SR-IOV.  This change allows Linux to enable SR-IOV
on these devices.

[bhelgaas: changelog]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=112221


Signed-off-by: Kelly Zytaruk <kelly.zytaruk@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent b404bcfb

drivers/pci/iov.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -387,10 +387,6 @@ static int sriov_init(struct pci_dev *dev, int pos)
		struct resource *res;
		struct pci_dev *pdev;

		if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END &&
		pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT)
		return -ENODEV;

		pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
		if (ctrl & PCI_SRIOV_CTRL_VFE) {
		pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);

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