linux-kernel - [PATCH 04/13] PCI: quirk dma_func

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Message-ID: <20140501162729.17512.34992.stgit@bling.home>
Date:	Thu, 01 May 2014 10:27:30 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:	bhelgaas@...gle.com, acooks@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH 04/13] PCI: quirk dma_func_alias for Marvell devices

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.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 drivers/pci/quirks.c |   22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index a458c6b..82b2733 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3349,6 +3349,28 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe230, quirk_dma_func0_alias);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe832, quirk_dma_func0_alias);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe832, quirk_dma_func0_alias);
 
+static void quirk_dma_func1_alias(struct pci_dev *dev)
+{
+	if (PCI_SLOT(dev->devfn) != 1)
+		dev->dma_func_alias |= (1 << 1);
+}
+
+/*
+ * 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://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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