From 0e0b47abb71a2c4aed5895c01f41827dbd8a981c Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Fri, 8 Feb 2008 16:37:03 +1100 Subject: [PATCH] [POWERPC] Don't enable cell IOMMU fixed mapping if there are no dma-ranges In order for the cell IOMMU fixed mapping to work we need "dma-ranges" properties in the device tree. If there are none then there's no point enabling the fixed mapping support. Signed-off-by: Michael Ellerman Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/cell/iommu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c index a276064471..1f7b254740 100644 --- a/arch/powerpc/platforms/cell/iommu.c +++ b/arch/powerpc/platforms/cell/iommu.c @@ -917,6 +917,18 @@ static int __init cell_iommu_fixed_mapping_init(void) return -1; } + /* We must have dma-ranges properties for fixed mapping to work */ + for (np = NULL; (np = of_find_all_nodes(np));) { + if (of_find_property(np, "dma-ranges", NULL)) + break; + } + of_node_put(np); + + if (!np) { + pr_debug("iommu: no dma-ranges found, no fixed mapping\n"); + return -1; + } + /* The default setup is to have the fixed mapping sit after the * dynamic region, so find the top of the largest IOMMU window * on any axon, then add the size of RAM and that's our max value. -- 2.39.5