Return error code to indicate no support.
Signed-off-by: Will Davis <wdavis@xxxxxxxxxx>
---
arch/x86/kernel/amd_gart_64.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index 8e3842f..6ba62e6 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -474,6 +474,19 @@ error:
return 0;
}
+#ifdef CONFIG_HAS_DMA_P2P
+static dma_peer_addr_t gart_map_peer_resource(struct device *dev,
+ struct device *peer,
+ struct resource *res,
+ unsigned long offset,
+ size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ return bad_dma_addr;
+}
+#endif
+
/* allocate and map a coherent mapping */
static void *
gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
@@ -704,6 +717,9 @@ static struct dma_map_ops gart_dma_ops = {
.alloc = gart_alloc_coherent,
.free = gart_free_coherent,
.mapping_error = gart_mapping_error,
+#ifdef CONFIG_HAS_DMA_P2P
+ .map_peer_resource = gart_map_peer_resource,
+#endif
};
static void gart_iommu_shutdown(void)
--
2.5.1
--
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