path: root/arch/arm64
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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-12-16 14:28:42 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2016-12-19 09:05:20 -0500
commitfff5d99225107f5f13fe4a9805adc2a1c4b5fb00 (patch)
tree0b9748236ea4580bc44f9a24ec27c215cb46ed9b /arch/arm64
parentae7871be189cb41184f1e05742b4a99e2c59774d (diff)
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 'arch/arm64')
0 files changed, 0 insertions, 0 deletions