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Commit 0e0b47ab authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
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[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: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent ccd05d08

arch/powerpc/platforms/cell/iommu.c

+12 −0
Original line number Diff line number Diff line
@@ -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.