From 8aa2659009714cf5f9ffe7f3e16ccfa8ff0e0d61 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 9 Oct 2008 17:06:24 +0000 Subject: [PATCH] powerpc: Fix DMA offset for non-coherent DMA After Becky's work we can almost have different DMA offsets between on-chip devices and PCI. Almost because there's a problem with the non-coherent DMA code that basically ignores the programmed offset to use the global one for everything. This fixes it. Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/dma.c | 8 ++++++-- arch/powerpc/lib/dma-noncoherent.c | 2 +- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index 41fdd48bf43..1562daf8839 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -30,11 +30,15 @@ static unsigned long get_dma_direct_offset(struct device *dev) void *dma_direct_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) { + void *ret; #ifdef CONFIG_NOT_COHERENT_CACHE - return __dma_alloc_coherent(size, dma_handle, flag); + ret = __dma_alloc_coherent(size, dma_handle, flag); + if (ret == NULL) + return NULL; + *dma_handle += get_dma_direct_offset(dev); + return ret; #else struct page *page; - void *ret; int node = dev_to_node(dev); /* ignore region specifiers */ diff --git a/arch/powerpc/lib/dma-noncoherent.c b/arch/powerpc/lib/dma-noncoherent.c index 5d83907f659..31734c0969c 100644 --- a/arch/powerpc/lib/dma-noncoherent.c +++ b/arch/powerpc/lib/dma-noncoherent.c @@ -203,7 +203,7 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp) /* * Set the "dma handle" */ - *handle = page_to_bus(page); + *handle = page_to_phys(page); do { BUG_ON(!pte_none(*pte));