2 * Copyright © 2006, Intel Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <linux/dmaengine.h>
21 #include <linux/spinlock.h>
22 #include <linux/interrupt.h>
24 /* on architectures without dma-mapping capabilities we need to ensure
25 * that the asynchronous path compiles away
28 #define __async_inline
30 #define __async_inline __always_inline
34 * dma_chan_ref - object used to manage dma channels received from the
36 * @chan - the channel being tracked
37 * @node - node for the channel to be placed on async_tx_master_list
38 * @rcu - for list_del_rcu
39 * @count - number of times this channel is listed in the pool
40 * (for channels with multiple capabiities)
43 struct dma_chan *chan;
44 struct list_head node;
50 * async_tx_flags - modifiers for the async_* calls
51 * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
52 * the destination address is not a source. The asynchronous case handles this
53 * implicitly, the synchronous case needs to zero the destination block.
54 * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
55 * also one of the source addresses. In the synchronous case the destination
56 * address is an implied source, whereas the asynchronous case it must be listed
57 * as a source. The destination address must be the first address in the source
59 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
61 * @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining.
64 ASYNC_TX_XOR_ZERO_DST = (1 << 0),
65 ASYNC_TX_XOR_DROP_DST = (1 << 1),
66 ASYNC_TX_ACK = (1 << 3),
67 ASYNC_TX_DEP_ACK = (1 << 4),
70 #ifdef CONFIG_DMA_ENGINE
71 #define async_tx_issue_pending_all dma_issue_pending_all
72 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
73 #include <asm/async_tx.h>
75 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
76 __async_tx_find_channel(dep, type)
78 __async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
79 enum dma_transaction_type tx_type);
80 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
82 static inline void async_tx_issue_pending_all(void)
87 static inline struct dma_chan *
88 async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
89 enum dma_transaction_type tx_type, struct page **dst, int dst_count,
90 struct page **src, int src_count, size_t len)
97 * async_tx_sync_epilog - actions to take if an operation is run synchronously
98 * @cb_fn: function to call when the transaction completes
99 * @cb_fn_param: parameter to pass to the callback routine
102 async_tx_sync_epilog(dma_async_tx_callback cb_fn, void *cb_fn_param)
109 async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
110 enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
111 dma_async_tx_callback cb_fn, void *cb_fn_param);
113 struct dma_async_tx_descriptor *
114 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
115 int src_cnt, size_t len, enum async_tx_flags flags,
116 struct dma_async_tx_descriptor *depend_tx,
117 dma_async_tx_callback cb_fn, void *cb_fn_param);
119 struct dma_async_tx_descriptor *
120 async_xor_zero_sum(struct page *dest, struct page **src_list,
121 unsigned int offset, int src_cnt, size_t len,
122 u32 *result, enum async_tx_flags flags,
123 struct dma_async_tx_descriptor *depend_tx,
124 dma_async_tx_callback cb_fn, void *cb_fn_param);
126 struct dma_async_tx_descriptor *
127 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
128 unsigned int src_offset, size_t len, enum async_tx_flags flags,
129 struct dma_async_tx_descriptor *depend_tx,
130 dma_async_tx_callback cb_fn, void *cb_fn_param);
132 struct dma_async_tx_descriptor *
133 async_memset(struct page *dest, int val, unsigned int offset,
134 size_t len, enum async_tx_flags flags,
135 struct dma_async_tx_descriptor *depend_tx,
136 dma_async_tx_callback cb_fn, void *cb_fn_param);
138 struct dma_async_tx_descriptor *
139 async_trigger_callback(enum async_tx_flags flags,
140 struct dma_async_tx_descriptor *depend_tx,
141 dma_async_tx_callback cb_fn, void *cb_fn_param);
143 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
144 #endif /* _ASYNC_TX_H_ */