From b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7 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] 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>
---
arch/x86/kernel/amd_iommu.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 0cb8fd2359f52..a6a6f8ed1cf58 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/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,
};
/*
--
GitLab