[PATCH] powerpc: 64k pages vs. U3 iommu

That DART (U3 iommu) code didn't properly scale the number of entries
when using !4k pages. That caused crashes when booting G5s with more
than 2Gb of RAM. This fixes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/sysdev/u3_iommu.c b/arch/powerpc/sysdev/u3_iommu.c
index 543d659..f32baf7 100644 (file)
--- a/arch/powerpc/sysdev/u3_iommu.c
+++ b/arch/powerpc/sysdev/u3_iommu.c
@@ -226,7 +226,7 @@ static void iommu_table_u3_setup(void)
        iommu_table_u3.it_busno = 0;
        iommu_table_u3.it_offset = 0;
        /* it_size is in number of entries */
-       iommu_table_u3.it_size = dart_tablesize / sizeof(u32);
+       iommu_table_u3.it_size = (dart_tablesize / sizeof(u32)) >> DART_PAGE_FACTOR;
 
        /* Initialize the common IOMMU code */
        iommu_table_u3.it_base = (unsigned long)dart_vbase;