dmaengine: allow dma support for async_tx to be toggled

Provide a config option for blocking the allocation of dma channels to
the async_tx api.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

3 files changed, 32 insertions, 3 deletions

diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
index f21147f3626a..06eb6cc09fef 100644
--- a/crypto/async_tx/async_tx.c
+++ b/crypto/async_tx/async_tx.c
@@ -30,7 +30,7 @@
 #ifdef CONFIG_DMA_ENGINE
 static int __init async_tx_init(void)
 {
-        dmaengine_get();
+        async_dmaengine_get();
 
         printk(KERN_INFO "async_tx: api initialized (async)\n");
 
@@ -39,7 +39,7 @@ static int __init async_tx_init(void)
 
 static void __exit async_tx_exit(void)
 {
-        dmaengine_put();
+        async_dmaengine_put();
 }
 
 /**
@@ -56,7 +56,7 @@ __async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
         if (depend_tx &&
             dma_has_cap(tx_type, depend_tx->chan->device->cap_mask))
                 return depend_tx->chan;
-        return dma_find_channel(tx_type);
+        return async_dma_find_channel(tx_type);
 }
 EXPORT_SYMBOL_GPL(__async_tx_find_channel);
 #else
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 48ea59e79672..3b3c01b6f1ee 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -98,6 +98,17 @@ config NET_DMA
           Say Y here if you enabled INTEL_IOATDMA or FSL_DMA, otherwise
           say N.
 
+config ASYNC_TX_DMA
+        bool "Async_tx: Offload support for the async_tx api"
+        depends on DMA_ENGINE
+        help
+          This allows the async_tx api to take advantage of offload engines for
+          memcpy, memset, xor, and raid6 p+q operations.  If your platform has
+          a dma engine that can perform raid operations and you have enabled
+          MD_RAID456 say Y.
+
+          If unsure, say N.
+
 config DMATEST
         tristate "DMA Test client"
         depends on DMA_ENGINE
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 96e676e5bf9b..2afc2c95e42d 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -288,6 +288,24 @@ static inline void net_dmaengine_put(void)
 }
 #endif
 
+#ifdef CONFIG_ASYNC_TX_DMA
+#define async_dmaengine_get()   dmaengine_get()
+#define async_dmaengine_put()   dmaengine_put()
+#define async_dma_find_channel(type) dma_find_channel(type)
+#else
+static inline void async_dmaengine_get(void)
+{
+}
+static inline void async_dmaengine_put(void)
+{
+}
+static inline struct dma_chan *
+async_dma_find_channel(enum dma_transaction_type type)
+{
+        return NULL;
+}
+#endif
+
 dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
         void *dest, void *src, size_t len);
 dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan,