Commit c4430841 authored Mar 13, 2014 by Will Deacon

iommu/arm-smmu: allow 42-bit stage-1 output size with 64K pages



The output size of stage-1 is currently limited by the input size of
stage-2, which is further limited by VA_BITS since we make use of the
standard pgd_alloc functions for creating page tables.

This patch ensures that we use VA_BITS instead of a hardcoded '39'
for the stage-1 output size limit.

Signed-off-by: Will Deacon <will.deacon@arm.com>

parent d1db0eea

drivers/iommu/arm-smmu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1804,7 +1804,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
		* allocation (PTRS_PER_PGD).
		*/
		#ifdef CONFIG_64BIT
		smmu->s1_output_size = min(39UL, size);
		smmu->s1_output_size = min((unsigned long)VA_BITS, size);
		#else
		smmu->s1_output_size = min(32UL, size);
		#endif