On Thu, May 22, 2014 at 05:07:55PM -0600, Alex Williamson wrote:
> Several Marvell devices and a JMicron device have a similar DMA
> requester ID problem to Ricoh, except they use function 1 as the
> PCIe requester ID. Add a quirk for these to populate the DMA
> function alias bitmap.
What's the DMA function alias bitmap?
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> ---
> drivers/pci/quirks.c | 36 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 36 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index bc8ebd9..923689f 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3349,6 +3349,42 @@ static void quirk_dma_func0_alias(struct pci_dev *dev)
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe832, quirk_dma_func0_alias);
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe476, quirk_dma_func0_alias);
>
> +static void quirk_dma_func1_alias(struct pci_dev *dev)
> +{
> + if (PCI_FUNC(dev->devfn) != 1) {
> + dev->dma_alias_devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 1);
> + dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
> + }
> +}
> +
> +/*
> + * Marvell 88SE9123 uses function 1 as the requester ID for DMA. In some
> + * SKUs function 1 is present and is a legacy IDE controller, in other
> + * SKUs this function is not present, making this a ghost requester.
> + * https://bugzilla.kernel.org/show_bug.cgi?id=42679
> + */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL_EXT, 0x9123,
> + quirk_dma_func1_alias);
> +/* https://bugzilla.kernel.org/show_bug.cgi?id=42679#c14 */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL_EXT, 0x9130,
> + quirk_dma_func1_alias);
> +/* https://bugzilla.kernel.org/show_bug.cgi?id=42679#c47 + c57 */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL_EXT, 0x9172,
> + quirk_dma_func1_alias);
> +/* https://bugzilla.kernel.org/show_bug.cgi?id=42679#c59 */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL_EXT, 0x917a,
> + quirk_dma_func1_alias);
> +/* https://bugzilla.kernel.org/show_bug.cgi?id=42679#c46 */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL_EXT, 0x91a0,
> + quirk_dma_func1_alias);
> +/* https://bugzilla.kernel.org/show_bug.cgi?id=42679#c49 */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL_EXT, 0x9230,
> + quirk_dma_func1_alias);
> +/* https://bugs.gentoo.org/show_bug.cgi?id=497630 */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_JMICRON,
> + PCI_DEVICE_ID_JMICRON_JMB388_ESD,
> + quirk_dma_func1_alias);
> +
> static struct pci_dev *pci_func_0_dma_source(struct pci_dev *dev)
> {
> if (!PCI_FUNC(dev->devfn))
>
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