Geert Uytterhoeven fff5d99225 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>

2016-12-19 09:05:20 -05:00

..

events

swiotlb: Add swiotlb=noforce debug option

2016-12-19 09:05:20 -05:00

define_trace.h

tracing: Introduce TRACE_EVENT_FN_COND macro

2015-12-23 14:27:21 -05:00

perf.h

tracing: Use outer () on __get_str() definition

2016-07-15 15:50:58 -04:00

syscall.h

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_events.h

tracing: Use outer () on __get_str() definition

2016-07-15 15:50:58 -04:00