2 files changed, 159 insertions, 2 deletions

diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
new file mode 100644
index 000000000000..ff1255079fa1
--- /dev/null
+++ b/include/linux/async_tx.h
@@ -0,0 +1,156 @@
+/*
+ * Copyright © 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef _ASYNC_TX_H_
+#define _ASYNC_TX_H_
+#include <linux/dmaengine.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+
+/**
+ * dma_chan_ref - object used to manage dma channels received from the
+ *   dmaengine core.
+ * @chan - the channel being tracked
+ * @node - node for the channel to be placed on async_tx_master_list
+ * @rcu - for list_del_rcu
+ * @count - number of times this channel is listed in the pool
+ *      (for channels with multiple capabiities)
+ */
+struct dma_chan_ref {
+        struct dma_chan *chan;
+        struct list_head node;
+        struct rcu_head rcu;
+        atomic_t count;
+};
+
+/**
+ * async_tx_flags - modifiers for the async_* calls
+ * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
+ * the destination address is not a source.  The asynchronous case handles this
+ * implicitly, the synchronous case needs to zero the destination block.
+ * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
+ * also one of the source addresses.  In the synchronous case the destination
+ * address is an implied source, whereas the asynchronous case it must be listed
+ * as a source.  The destination address must be the first address in the source
+ * array.
+ * @ASYNC_TX_ASSUME_COHERENT: skip cache maintenance operations
+ * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
+ * dependency chain
+ * @ASYNC_TX_DEP_ACK: ack the dependency descriptor.  Useful for chaining.
+ * @ASYNC_TX_KMAP_SRC: if the transaction is to be performed synchronously
+ * take an atomic mapping (KM_USER0) on the source page(s)
+ * @ASYNC_TX_KMAP_DST: if the transaction is to be performed synchronously
+ * take an atomic mapping (KM_USER0) on the dest page(s)
+ */
+enum async_tx_flags {
+        ASYNC_TX_XOR_ZERO_DST    = (1 << 0),
+        ASYNC_TX_XOR_DROP_DST    = (1 << 1),
+        ASYNC_TX_ASSUME_COHERENT = (1 << 2),
+        ASYNC_TX_ACK             = (1 << 3),
+        ASYNC_TX_DEP_ACK         = (1 << 4),
+        ASYNC_TX_KMAP_SRC        = (1 << 5),
+        ASYNC_TX_KMAP_DST        = (1 << 6),
+};
+
+#ifdef CONFIG_DMA_ENGINE
+void async_tx_issue_pending_all(void);
+enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
+void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx);
+struct dma_chan *
+async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
+        enum dma_transaction_type tx_type);
+#else
+static inline void async_tx_issue_pending_all(void)
+{
+        do { } while (0);
+}
+
+static inline enum dma_status
+dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
+{
+        return DMA_SUCCESS;
+}
+
+static inline void
+async_tx_run_dependencies(struct dma_async_tx_descriptor *tx,
+        struct dma_chan *host_chan)
+{
+        do { } while (0);
+}
+
+static inline struct dma_chan *
+async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
+        enum dma_transaction_type tx_type)
+{
+        return NULL;
+}
+#endif
+
+/**
+ * async_tx_sync_epilog - actions to take if an operation is run synchronously
+ * @flags: async_tx flags
+ * @depend_tx: transaction depends on depend_tx
+ * @cb_fn: function to call when the transaction completes
+ * @cb_fn_param: parameter to pass to the callback routine
+ */
+static inline void
+async_tx_sync_epilog(unsigned long flags,
+        struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param)
+{
+        if (cb_fn)
+                cb_fn(cb_fn_param);
+
+        if (depend_tx && (flags & ASYNC_TX_DEP_ACK))
+                async_tx_ack(depend_tx);
+}
+
+void
+async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
+        enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param);
+
+struct dma_async_tx_descriptor *
+async_xor(struct page *dest, struct page **src_list, unsigned int offset,
+        int src_cnt, size_t len, enum async_tx_flags flags,
+        struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param);
+
+struct dma_async_tx_descriptor *
+async_xor_zero_sum(struct page *dest, struct page **src_list,
+        unsigned int offset, int src_cnt, size_t len,
+        u32 *result, enum async_tx_flags flags,
+        struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param);
+
+struct dma_async_tx_descriptor *
+async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
+        unsigned int src_offset, size_t len, enum async_tx_flags flags,
+        struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param);
+
+struct dma_async_tx_descriptor *
+async_memset(struct page *dest, int val, unsigned int offset,
+        size_t len, enum async_tx_flags flags,
+        struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param);
+
+struct dma_async_tx_descriptor *
+async_trigger_callback(enum async_tx_flags flags,
+        struct dma_async_tx_descriptor *depend_tx,
+        dma_async_tx_callback cb_fn, void *cb_fn_param);
+#endif /* _ASYNC_TX_H_ */
diff --git a/include/linux/raid/xor.h b/include/linux/raid/xor.h
index 7d6c20b654fa..3e120587eada 100644
--- a/include/linux/raid/xor.h
+++ b/include/linux/raid/xor.h
@@ -3,9 +3,10 @@
 
 #include <linux/raid/md.h>
 
-#define MAX_XOR_BLOCKS 5
+#define MAX_XOR_BLOCKS 4
 
-extern void xor_blocks(unsigned int count, unsigned int bytes, void **ptr);
+extern void xor_blocks(unsigned int count, unsigned int bytes,
+        void *dest, void **srcs);
 
 struct xor_block_template {
         struct xor_block_template *next;