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| author | Mike Rapoport <rppt@linux.ibm.com> | 2019-12-04 14:35:24 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-12-13 21:27:55 +1100 |
| commit | 8fabc623238e68b3ac63c0dd1657bf86c1fa33af (patch) | |
| tree | a818219c53fc6bf44e240eca0d537d10a88801ef /arch/powerpc/perf/hv-gpci.c | |
| parent | 656c21d6af5d9279dd7b51ca7a4a71008127044b (diff) | |
| download | linux-8fabc623238e68b3ac63c0dd1657bf86c1fa33af.tar.gz | |
powerpc: Ensure that swiotlb buffer is allocated from low memory
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
Diffstat (limited to 'arch/powerpc/perf/hv-gpci.c')
0 files changed, 0 insertions, 0 deletions