PCI: add PCI DMA source ID quirk

DMA transactions are tagged with the source ID of the device making
the request.  Occasionally hardware screws this up and uses the
source ID of a different device (often the wrong function number of
a multifunction device).  A specific Ricoh multifunction device is
a prime example of this problem and included in this patch.

Given a pci_dev, this function returns the pci_dev to use as the
source ID for DMA.  When hardware works correctly, this returns
the input device.  For the components of the Ricoh multifunction
device, it returns the pci_dev for function 0.

This will be used by IOMMU drivers for determining the boundaries
of IOMMU groups as multiple devices using the same source ID must
be contained within the same group.  This can also be used by
existing streaming DMA paths for the same purpose.

[bhelgaas: fold in pci_dev_get() for !CONFIG_PCI]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 2a7521677541..acd3956b44bd 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3179,3 +3179,54 @@ int pci_dev_specific_reset(struct pci_dev *dev, int probe)
 
         return -ENOTTY;
 }
+
+static struct pci_dev *pci_func_0_dma_source(struct pci_dev *dev)
+{
+        if (!PCI_FUNC(dev->devfn))
+                return pci_dev_get(dev);
+
+        return pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+}
+
+static const struct pci_dev_dma_source {
+        u16 vendor;
+        u16 device;
+        struct pci_dev *(*dma_source)(struct pci_dev *dev);
+} pci_dev_dma_source[] = {
+        /*
+         * https://bugzilla.redhat.com/show_bug.cgi?id=605888
+         *
+         * Some Ricoh devices use the function 0 source ID for DMA on
+         * other functions of a multifunction device.  The DMA devices
+         * is therefore function 0, which will have implications of the
+         * iommu grouping of these devices.
+         */
+        { PCI_VENDOR_ID_RICOH, 0xe822, pci_func_0_dma_source },
+        { PCI_VENDOR_ID_RICOH, 0xe230, pci_func_0_dma_source },
+        { PCI_VENDOR_ID_RICOH, 0xe832, pci_func_0_dma_source },
+        { PCI_VENDOR_ID_RICOH, 0xe476, pci_func_0_dma_source },
+        { 0 }
+};
+
+/*
+ * IOMMUs with isolation capabilities need to be programmed with the
+ * correct source ID of a device.  In most cases, the source ID matches
+ * the device doing the DMA, but sometimes hardware is broken and will
+ * tag the DMA as being sourced from a different device.  This function
+ * allows that translation.  Note that the reference count of the
+ * returned device is incremented on all paths.
+ */
+struct pci_dev *pci_get_dma_source(struct pci_dev *dev)
+{
+        const struct pci_dev_dma_source *i;
+
+        for (i = pci_dev_dma_source; i->dma_source; i++) {
+                if ((i->vendor == dev->vendor ||
+                     i->vendor == (u16)PCI_ANY_ID) &&
+                    (i->device == dev->device ||
+                     i->device == (u16)PCI_ANY_ID))
+                        return i->dma_source(dev);
+        }
+
+        return pci_dev_get(dev);
+}