x86: add free_coherent dma_ops callback to GART driver

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

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 076e64b2d4f3..ef753e233580 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -519,6 +519,15 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
         return NULL;
 }
 
+/* free a coherent mapping */
+static void
+gart_free_coherent(struct device *dev, size_t size, void *vaddr,
+                   dma_addr_t dma_addr)
+{
+        gart_unmap_single(dev, dma_addr, size, DMA_BIDIRECTIONAL);
+        free_pages((unsigned long)vaddr, get_order(size));
+}
+
 static int no_agp;
 
 static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size)
@@ -722,6 +731,7 @@ static struct dma_mapping_ops gart_dma_ops = {
         .map_sg                         = gart_map_sg,
         .unmap_sg                       = gart_unmap_sg,
         .alloc_coherent                 = gart_alloc_coherent,
+        .free_coherent                  = gart_free_coherent,
 };
 
 void gart_iommu_shutdown(void)