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async_tx: build-time toggling of async_{syndrome,xor}_val dma support

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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>
This commit is contained in:
Dan Williams
2009-11-19 17:10:37 -07:00
parent 4499a24dec
commit 7b3cc2b1fc
6 changed files with 46 additions and 6 deletions
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5
crypto/async_tx/Kconfig
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@@ -23,3 +23,8 @@ config ASYNC_RAID6_RECOV
select ASYNC_CORE
select ASYNC_PQ
config ASYNC_TX_DISABLE_PQ_VAL_DMA
bool
config ASYNC_TX_DISABLE_XOR_VAL_DMA
bool