From: Michael Ellerman <michael@ellerman.id.au>
Date: Fri, 8 Feb 2008 05:37:03 +0000 (+1100)
Subject: [POWERPC] Don't enable cell IOMMU fixed mapping if there are no dma-ranges
X-Git-Tag: v2.6.25-rc1~43^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0e0b47abb71a2c4aed5895c01f41827dbd8a981c;p=platform%2Fkernel%2Flinux-3.10.git

[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 <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index a276064..1f7b254 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.