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powerpc: Ensure that swiotlb buffer is allocated from low memory
[ Upstream commit 8fabc62323
]
Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G.
If a system has more physical memory than this limit, the swiotlb
buffer is not addressable because it is allocated from memblock using
top-down mode.
Force memblock to bottom-up mode before calling swiotlb_init() to
ensure that the swiotlb buffer is DMA-able.
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191204123524.22919-1-rppt@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -344,6 +344,14 @@ void __init mem_init(void)
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BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
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#ifdef CONFIG_SWIOTLB
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/*
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* Some platforms (e.g. 85xx) limit DMA-able memory way below
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* 4G. We force memblock to bottom-up mode to ensure that the
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* memory allocated in swiotlb_init() is DMA-able.
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* As it's the last memblock allocation, no need to reset it
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* back to to-down.
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*/
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memblock_set_bottom_up(true);
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swiotlb_init(0);
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#endif
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