linux-kernel - [PATCH v4.1 05/16] PCI: quirk dma_alias

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Date:	Wed, 28 May 2014 14:54:00 -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, eddy0596@...il.com, linux@...izon.com
Subject: [PATCH v4.1 05/16] PCI: quirk dma_alias_devfn 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
alias with the correct devfn.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---

v4.1: minor commitlog tweak, no code chage

 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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