[PATCH 27/32] powerpc: Make direct DMA use node local allocations

Benjamin Herrenschmidt benh at kernel.crashing.org
Sat Nov 11 17:25:16 EST 2006


This patch makes dma_alloc_coherent() use node local allocation when
using the direct DMA ops. The node is obtained from the new device
extension. If no such extension is present, the current node is used.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

 arch/powerpc/kernel/dma_64.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

Index: linux-cell/arch/powerpc/kernel/dma_64.c
===================================================================
--- linux-cell.orig/arch/powerpc/kernel/dma_64.c	2006-11-10 16:53:23.000000000 +1100
+++ linux-cell/arch/powerpc/kernel/dma_64.c	2006-11-10 16:53:56.000000000 +1100
@@ -120,14 +120,18 @@ unsigned long dma_direct_offset;
 static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag)
 {
+	struct page *page;
 	void *ret;
+	int node = dev->archdata.numa_node;
 
 	/* TODO: Maybe use the numa node here too ? */
-	ret = (void *)__get_free_pages(flag, get_order(size));
-	if (ret != NULL) {
-		memset(ret, 0, size);
-		*dma_handle = virt_to_abs(ret) | dma_direct_offset;
-	}
+	page = alloc_pages_node(node, flag, get_order(size));
+	if (page == NULL)
+		return NULL;
+	ret = page_address(page);
+	memset(ret, 0, size);
+	*dma_handle = virt_to_abs(ret) | dma_direct_offset;
+
 	return ret;
 }
 



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