From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 9 Sep 2008 16:40:46 +0000 (+0200)
Subject: AMD IOMMU: add dma_supported callback
X-Git-Tag: v2.6.28-rc1~712^2^4~24
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7;p=linux-2.6-omap-h63xx.git

AMD IOMMU: add dma_supported callback

This function determines if the AMD IOMMU implementation is responsible
for a given device. So the DMA layer can get this information from the
driver.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 0cb8fd2359f..a6a6f8ed1cf 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1204,6 +1204,30 @@ free_mem:
 	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,
 };
 
 /*