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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2016-12-16 16:28:42 +0300 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2016-12-19 17:05:20 +0300 |
| commit | fff5d99225107f5f13fe4a9805adc2a1c4b5fb00 (patch) | |
| tree | 0b9748236ea4580bc44f9a24ec27c215cb46ed9b /drivers | |
| parent | ae7871be189cb41184f1e05742b4a99e2c59774d (diff) | |
| download | linux-fff5d99225107f5f13fe4a9805adc2a1c4b5fb00.tar.xz | |
swiotlb: Add swiotlb=noforce debug option
On architectures like arm64, swiotlb is tied intimately to the core
architecture DMA support. In addition, ZONE_DMA cannot be disabled.
To aid debugging and catch devices not supporting DMA to memory outside
the 32-bit address space, add a kernel command line option
"swiotlb=noforce", which disables the use of bounce buffers.
If specified, trying to map memory that cannot be used with DMA will
fail, and a rate-limited warning will be printed.
Note that io_tlb_nslabs is set to 1, which is the minimal supported
value.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions