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Commit ebdb51eb authored by Alex Williamson's avatar Alex Williamson Committed by Bjorn Helgaas
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PCI: Add bridge DMA alias quirk for ASMedia and Tundra bridges 

The quirk is intended to be extremely generic, but we only apply it to
known offending devices.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=44881


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent c8fe16e3

drivers/pci/quirks.c

+23 −0
Original line number Diff line number Diff line
@@ -3385,6 +3385,29 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_JMICRON, 
			 PCI_DEVICE_ID_JMICRON_JMB388_ESD,

			 quirk_dma_func1_alias);



/*

 * A few PCIe-to-PCI bridges fail to expose a PCIe capability, resulting in

 * using the wrong DMA alias for the device.  Some of these devices can be

 * used as either forward or reverse bridges, so we need to test whether the

 * device is operating in the correct mode.  We could probably apply this

 * quirk to PCI_ANY_ID, but for now we'll just use known offenders.  The test

 * is for a non-root, non-PCIe bridge where the upstream device is PCIe and

 * is not a PCIe-to-PCI bridge, then @pdev is actually a PCIe-to-PCI bridge.

 */

static void quirk_use_pcie_bridge_dma_alias(struct pci_dev *pdev)

{

	if (!pci_is_root_bus(pdev->bus) &&

	    pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&

	    !pci_is_pcie(pdev) && pci_is_pcie(pdev->bus->self) &&

	    pci_pcie_type(pdev->bus->self) != PCI_EXP_TYPE_PCI_BRIDGE)

		pdev->dev_flags |= PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS;

}

/* ASM1083/1085, https://bugzilla.kernel.org/show_bug.cgi?id=44881#c46 */

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ASMEDIA, 0x1080,

			 quirk_use_pcie_bridge_dma_alias);

/* Tundra 8113, https://bugzilla.kernel.org/show_bug.cgi?id=44881#c43 */

DECLARE_PCI_FIXUP_HEADER(0x10e3, 0x8113, quirk_use_pcie_bridge_dma_alias);



static struct pci_dev *pci_func_0_dma_source(struct pci_dev *dev)

{

	if (!PCI_FUNC(dev->devfn))