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
63 ASYNC_TX_XOR_ZERO_DST = (1 << 0),
64 ASYNC_TX_XOR_DROP_DST = (1 << 1),
65 ASYNC_TX_ACK = (1 << 2),
69 * struct async_submit_ctl - async_tx submission/completion modifiers
70 * @flags: submission modifiers
71 * @depend_tx: parent dependency of the current operation being submitted
72 * @cb_fn: callback routine to run at operation completion
73 * @cb_param: parameter for the callback routine
74 * @scribble: caller provided space for dma/page address conversions
76 struct async_submit_ctl {
77 enum async_tx_flags flags;
78 struct dma_async_tx_descriptor *depend_tx;
79 dma_async_tx_callback cb_fn;
84 #ifdef CONFIG_DMA_ENGINE
85 #define async_tx_issue_pending_all dma_issue_pending_all
86 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
87 #include <asm/async_tx.h>
89 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
90 __async_tx_find_channel(dep, type)
92 __async_tx_find_channel(struct async_submit_ctl *submit,
93 enum dma_transaction_type tx_type);
94 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
96 static inline void async_tx_issue_pending_all(void)
101 static inline struct dma_chan *
102 async_tx_find_channel(struct async_submit_ctl *submit,
103 enum dma_transaction_type tx_type, struct page **dst,
104 int dst_count, struct page **src, int src_count,
112 * async_tx_sync_epilog - actions to take if an operation is run synchronously
113 * @cb_fn: function to call when the transaction completes
114 * @cb_fn_param: parameter to pass to the callback routine
117 async_tx_sync_epilog(struct async_submit_ctl *submit)
120 submit->cb_fn(submit->cb_param);
130 init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags,
131 struct dma_async_tx_descriptor *tx,
132 dma_async_tx_callback cb_fn, void *cb_param,
133 addr_conv_t *scribble)
136 args->depend_tx = tx;
138 args->cb_param = cb_param;
139 args->scribble = scribble;
142 void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
143 struct async_submit_ctl *submit);
145 struct dma_async_tx_descriptor *
146 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
147 int src_cnt, size_t len, struct async_submit_ctl *submit);
149 struct dma_async_tx_descriptor *
150 async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
151 int src_cnt, size_t len, u32 *result,
152 struct async_submit_ctl *submit);
154 struct dma_async_tx_descriptor *
155 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
156 unsigned int src_offset, size_t len,
157 struct async_submit_ctl *submit);
159 struct dma_async_tx_descriptor *
160 async_memset(struct page *dest, int val, unsigned int offset,
161 size_t len, struct async_submit_ctl *submit);
163 struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit);
165 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
166 #endif /* _ASYNC_TX_H_ */