From a6630682e1a175cd4b8575e9766944e40c103623 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 9 Sep 2008 18:40:46 +0200
Subject: [PATCH] --- yaml --- r: 112605 b: refs/heads/master c:
 b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7 h: refs/heads/master i:   112603:
 b289c6b374d7d265b6f1a731f6cbff19b4366942 v: v3

---
 [refs]                            |  2 +-
 trunk/arch/x86/kernel/amd_iommu.c | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 26208b8acf09..93134d70446a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a22131a223147016041b5e5cd0ae5ab61ef4177e
+refs/heads/master: b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7
diff --git a/trunk/arch/x86/kernel/amd_iommu.c b/trunk/arch/x86/kernel/amd_iommu.c
index 0cb8fd2359f5..a6a6f8ed1cf5 100644
--- a/trunk/arch/x86/kernel/amd_iommu.c
+++ b/trunk/arch/x86/kernel/amd_iommu.c
@@ -1204,6 +1204,30 @@ static void free_coherent(struct device *dev, size_t size,
 	free_pages((unsigned long)virt_addr, get_order(size));
 }
 
+/*
+ * This function is called by the DMA layer to find out if we can handle a
+ * particular device. It is part of the dma_ops.
+ */
+static int amd_iommu_dma_supported(struct device *dev, u64 mask)
+{
+	u16 bdf;
+	struct pci_dev *pcidev;
+
+	/* No device or no PCI device */
+	if (!dev || dev->bus != &pci_bus_type)
+		return 0;
+
+	pcidev = to_pci_dev(dev);
+
+	bdf = calc_devid(pcidev->bus->number, pcidev->devfn);
+
+	/* Out of our scope? */
+	if (bdf > amd_iommu_last_bdf)
+		return 0;
+
+	return 1;
+}
+
 /*
  * The function for pre-allocating protection domains.
  *
@@ -1247,6 +1271,7 @@ static struct dma_mapping_ops amd_iommu_dma_ops = {
 	.unmap_single = unmap_single,
 	.map_sg = map_sg,
 	.unmap_sg = unmap_sg,
+	.dma_supported = amd_iommu_dma_supported,
 };
 
 /*