From e89dafb5ca5022d3bc63602018adfc766c73bc2b Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Thu, 16 Oct 2014 17:43:02 +1100 Subject: [PATCH] powerpc: Only do dynamic DMA zone limits on platforms that need it Scott's patch 1c98025c6c95 "Dynamic DMA zone limits" changed dma_direct_alloc_coherent() to start using dev->coherent_dma_mask. That seems fair enough, but it exposes the fact that some of the drivers we care about on IBM platforms aren't setting the coherent mask. The proper fix is to have drivers set the coherent mask and also have the platform code honor it. For now, just restrict the dynamic DMA zone limits to the platforms that need it. Signed-off-by: Michael Ellerman Acked-by: Scott Wood --- arch/powerpc/kernel/dma.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index adac9dc..484b2d4 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -53,9 +53,16 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size, #else struct page *page; int node = dev_to_node(dev); +#ifdef CONFIG_FSL_SOC u64 pfn = get_pfn_limit(dev); int zone; + /* + * This code should be OK on other platforms, but we have drivers that + * don't set coherent_dma_mask. As a workaround we just ifdef it. This + * whole routine needs some serious cleanup. + */ + zone = dma_pfn_limit_to_zone(pfn); if (zone < 0) { dev_err(dev, "%s: No suitable zone for pfn %#llx\n", @@ -73,6 +80,7 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size, break; #endif }; +#endif /* CONFIG_FSL_SOC */ /* ignore region specifiers */ flag &= ~(__GFP_HIGHMEM); -- 2.7.4