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authorDan Williams <dan.j.williams@intel.com>2009-03-25 09:13:25 -0700
committerDan Williams <dan.j.williams@intel.com>2009-03-25 09:13:25 -0700
commit729b5d1b8ec72c28e99840b3f300ba67726e3ab9 (patch)
tree8eac6444ea80bf05f461eb77243f56b008ee5083
parent06164f3194e01ea4c76941ac60f541d656c8975f (diff)
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>
-rw-r--r--crypto/async_tx/async_tx.c6
-rw-r--r--drivers/dma/Kconfig11
-rw-r--r--include/linux/dmaengine.h18
3 files changed, 32 insertions, 3 deletions
diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
index f21147f3626..06eb6cc09fe 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 48ea59e7967..3b3c01b6f1e 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 96e676e5bf9..2afc2c95e42 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,