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>

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;
 }