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| author | Dan Williams <dan.j.williams@intel.com> | 2009-11-19 17:10:37 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-11-19 23:21:03 -0700 |
| commit | 7b3cc2b1fc2066391e498f3387204908c4eced21 (patch) | |
| tree | 8a2bc28955710c580201046d04843773cb7d87a1 /drivers/dma/dmaengine.c | |
| parent | 4499a24dec00e037da7d09caccad45e7594a9c19 (diff) | |
| download | linux-7b3cc2b1fc2066391e498f3387204908c4eced21.tar.gz linux-7b3cc2b1fc2066391e498f3387204908c4eced21.tar.bz2 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/dmaengine.c')
| -rw-r--r-- | drivers/dma/dmaengine.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index b6442f09d0fe..8f99354082ce 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -632,16 +632,22 @@ static bool device_has_all_tx_types(struct dma_device *device) #if defined(CONFIG_ASYNC_XOR) || defined(CONFIG_ASYNC_XOR_MODULE) if (!dma_has_cap(DMA_XOR, device->cap_mask)) return false; + + #ifndef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA if (!dma_has_cap(DMA_XOR_VAL, device->cap_mask)) return false; #endif + #endif #if defined(CONFIG_ASYNC_PQ) || defined(CONFIG_ASYNC_PQ_MODULE) if (!dma_has_cap(DMA_PQ, device->cap_mask)) return false; + + #ifndef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA if (!dma_has_cap(DMA_PQ_VAL, device->cap_mask)) return false; #endif + #endif return true; } |