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1/*
2 * Copyright © 2006, Intel Corporation.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 */
18#ifndef _ASYNC_TX_H_
19#define _ASYNC_TX_H_
20#include <linux/dmaengine.h>
21#include <linux/spinlock.h>
22#include <linux/interrupt.h>
23
24/**
25 * dma_chan_ref - object used to manage dma channels received from the
26 * dmaengine core.
27 * @chan - the channel being tracked
28 * @node - node for the channel to be placed on async_tx_master_list
29 * @rcu - for list_del_rcu
30 * @count - number of times this channel is listed in the pool
31 * (for channels with multiple capabiities)
32 */
33struct dma_chan_ref {
34 struct dma_chan *chan;
35 struct list_head node;
36 struct rcu_head rcu;
37 atomic_t count;
38};
39
40/**
41 * async_tx_flags - modifiers for the async_* calls
42 * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
43 * the destination address is not a source. The asynchronous case handles this
44 * implicitly, the synchronous case needs to zero the destination block.
45 * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
46 * also one of the source addresses. In the synchronous case the destination
47 * address is an implied source, whereas the asynchronous case it must be listed
48 * as a source. The destination address must be the first address in the source
49 * array.
50 * @ASYNC_TX_ASSUME_COHERENT: skip cache maintenance operations
51 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
52 * dependency chain
53 * @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining.
54 * @ASYNC_TX_KMAP_SRC: if the transaction is to be performed synchronously
55 * take an atomic mapping (KM_USER0) on the source page(s)
56 * @ASYNC_TX_KMAP_DST: if the transaction is to be performed synchronously
57 * take an atomic mapping (KM_USER0) on the dest page(s)
58 */
59enum async_tx_flags {
60 ASYNC_TX_XOR_ZERO_DST = (1 << 0),
61 ASYNC_TX_XOR_DROP_DST = (1 << 1),
62 ASYNC_TX_ASSUME_COHERENT = (1 << 2),
63 ASYNC_TX_ACK = (1 << 3),
64 ASYNC_TX_DEP_ACK = (1 << 4),
65 ASYNC_TX_KMAP_SRC = (1 << 5),
66 ASYNC_TX_KMAP_DST = (1 << 6),
67};
68
69#ifdef CONFIG_DMA_ENGINE
70void async_tx_issue_pending_all(void);
71enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
72void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx);
73struct dma_chan *
74async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
75 enum dma_transaction_type tx_type);
76#else
77static inline void async_tx_issue_pending_all(void)
78{
79 do { } while (0);
80}
81
82static inline enum dma_status
83dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
84{
85 return DMA_SUCCESS;
86}
87
88static inline void
89async_tx_run_dependencies(struct dma_async_tx_descriptor *tx,
90 struct dma_chan *host_chan)
91{
92 do { } while (0);
93}
94
95static inline struct dma_chan *
96async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
97 enum dma_transaction_type tx_type)
98{
99 return NULL;
100}
101#endif
102
103/**
104 * async_tx_sync_epilog - actions to take if an operation is run synchronously
105 * @flags: async_tx flags
106 * @depend_tx: transaction depends on depend_tx
107 * @cb_fn: function to call when the transaction completes
108 * @cb_fn_param: parameter to pass to the callback routine
109 */
110static inline void
111async_tx_sync_epilog(unsigned long flags,
112 struct dma_async_tx_descriptor *depend_tx,
113 dma_async_tx_callback cb_fn, void *cb_fn_param)
114{
115 if (cb_fn)
116 cb_fn(cb_fn_param);
117
118 if (depend_tx && (flags & ASYNC_TX_DEP_ACK))
119 async_tx_ack(depend_tx);
120}
121
122void
123async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
124 enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
125 dma_async_tx_callback cb_fn, void *cb_fn_param);
126
127struct dma_async_tx_descriptor *
128async_xor(struct page *dest, struct page **src_list, unsigned int offset,
129 int src_cnt, size_t len, enum async_tx_flags flags,
130 struct dma_async_tx_descriptor *depend_tx,
131 dma_async_tx_callback cb_fn, void *cb_fn_param);
132
133struct dma_async_tx_descriptor *
134async_xor_zero_sum(struct page *dest, struct page **src_list,
135 unsigned int offset, int src_cnt, size_t len,
136 u32 *result, enum async_tx_flags flags,
137 struct dma_async_tx_descriptor *depend_tx,
138 dma_async_tx_callback cb_fn, void *cb_fn_param);
139
140struct dma_async_tx_descriptor *
141async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
142 unsigned int src_offset, size_t len, enum async_tx_flags flags,
143 struct dma_async_tx_descriptor *depend_tx,
144 dma_async_tx_callback cb_fn, void *cb_fn_param);
145
146struct dma_async_tx_descriptor *
147async_memset(struct page *dest, int val, unsigned int offset,
148 size_t len, enum async_tx_flags flags,
149 struct dma_async_tx_descriptor *depend_tx,
150 dma_async_tx_callback cb_fn, void *cb_fn_param);
151
152struct dma_async_tx_descriptor *
153async_trigger_callback(enum async_tx_flags flags,
154 struct dma_async_tx_descriptor *depend_tx,
155 dma_async_tx_callback cb_fn, void *cb_fn_param);
156#endif /* _ASYNC_TX_H_ */