diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2009-11-20 01:10:37 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-11-20 07:21:03 +0100 |
| commit | 7b3cc2b1fc2066391e498f3387204908c4eced21 (patch) | |
| tree | 8a2bc28955710c580201046d04843773cb7d87a1 /drivers/dma/Kconfig | |
| parent | dmaengine: include xor/pq validate in device_has_all_tx_types() (diff) | |
| download | linux-7b3cc2b1fc2066391e498f3387204908c4eced21.tar.xz linux-7b3cc2b1fc2066391e498f3387204908c4eced21.zip | |
async_tx: build-time toggling of async_{syndrome,xor}_val dma support
ioat3.2 does not support asynchronous error notifications which makes
the driver experience latencies when non-zero pq validate results are
expected. Provide a mechanism for turning off async_xor_val and
async_syndrome_val via Kconfig. This approach is generally useful for
any driver that specifies ASYNC_TX_DISABLE_CHANNEL_SWITCH and would like
to force the async_tx api to fall back to the synchronous path for
certain operations.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/Kconfig')
| -rw-r--r-- | drivers/dma/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 5903a88351bf..b401dadad4a8 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -26,6 +26,8 @@ config INTEL_IOATDMA select DMA_ENGINE select DCA select ASYNC_TX_DISABLE_CHANNEL_SWITCH + select ASYNC_TX_DISABLE_PQ_VAL_DMA + select ASYNC_TX_DISABLE_XOR_VAL_DMA help Enable support for the Intel(R) I/OAT DMA engine present in recent Intel Xeon chipsets. |