1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright © 2006, Intel Corporation.
7 #include <linux/dmaengine.h>
8 #include <linux/spinlock.h>
9 #include <linux/interrupt.h>
11 /* on architectures without dma-mapping capabilities we need to ensure
12 * that the asynchronous path compiles away
15 #define __async_inline
17 #define __async_inline __always_inline
21 * dma_chan_ref - object used to manage dma channels received from the
23 * @chan - the channel being tracked
24 * @node - node for the channel to be placed on async_tx_master_list
25 * @rcu - for list_del_rcu
26 * @count - number of times this channel is listed in the pool
27 * (for channels with multiple capabiities)
30 struct dma_chan *chan;
31 struct list_head node;
37 * async_tx_flags - modifiers for the async_* calls
38 * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
39 * destination address is not a source. The asynchronous case handles this
40 * implicitly, the synchronous case needs to zero the destination block.
41 * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
42 * also one of the source addresses. In the synchronous case the destination
43 * address is an implied source, whereas the asynchronous case it must be listed
44 * as a source. The destination address must be the first address in the source
46 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
48 * @ASYNC_TX_FENCE: specify that the next operation in the dependency
49 * chain uses this operation's result as an input
50 * @ASYNC_TX_PQ_XOR_DST: do not overwrite the syndrome but XOR it with the
51 * input data. Required for rmw case.
54 ASYNC_TX_XOR_ZERO_DST = (1 << 0),
55 ASYNC_TX_XOR_DROP_DST = (1 << 1),
56 ASYNC_TX_ACK = (1 << 2),
57 ASYNC_TX_FENCE = (1 << 3),
58 ASYNC_TX_PQ_XOR_DST = (1 << 4),
62 * struct async_submit_ctl - async_tx submission/completion modifiers
63 * @flags: submission modifiers
64 * @depend_tx: parent dependency of the current operation being submitted
65 * @cb_fn: callback routine to run at operation completion
66 * @cb_param: parameter for the callback routine
67 * @scribble: caller provided space for dma/page address conversions
69 struct async_submit_ctl {
70 enum async_tx_flags flags;
71 struct dma_async_tx_descriptor *depend_tx;
72 dma_async_tx_callback cb_fn;
77 #if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH)
78 #define async_tx_issue_pending_all dma_issue_pending_all
81 * async_tx_issue_pending - send pending descriptor to the hardware channel
82 * @tx: descriptor handle to retrieve hardware context
84 * Note: any dependent operations will have already been issued by
85 * async_tx_channel_switch, or (in the case of no channel switch) will
86 * be already pending on this channel.
88 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
91 struct dma_chan *chan = tx->chan;
92 struct dma_device *dma = chan->device;
94 dma->device_issue_pending(chan);
97 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
98 #include <asm/async_tx.h>
100 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
101 __async_tx_find_channel(dep, type)
103 __async_tx_find_channel(struct async_submit_ctl *submit,
104 enum dma_transaction_type tx_type);
105 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
107 static inline void async_tx_issue_pending_all(void)
112 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
117 static inline struct dma_chan *
118 async_tx_find_channel(struct async_submit_ctl *submit,
119 enum dma_transaction_type tx_type, struct page **dst,
120 int dst_count, struct page **src, int src_count,
128 * async_tx_sync_epilog - actions to take if an operation is run synchronously
129 * @cb_fn: function to call when the transaction completes
130 * @cb_fn_param: parameter to pass to the callback routine
133 async_tx_sync_epilog(struct async_submit_ctl *submit)
136 submit->cb_fn(submit->cb_param);
146 init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags,
147 struct dma_async_tx_descriptor *tx,
148 dma_async_tx_callback cb_fn, void *cb_param,
149 addr_conv_t *scribble)
152 args->depend_tx = tx;
154 args->cb_param = cb_param;
155 args->scribble = scribble;
158 void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
159 struct async_submit_ctl *submit);
161 struct dma_async_tx_descriptor *
162 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
163 int src_cnt, size_t len, struct async_submit_ctl *submit);
165 struct dma_async_tx_descriptor *
166 async_xor_offs(struct page *dest, unsigned int offset,
167 struct page **src_list, unsigned int *src_offset,
168 int src_cnt, size_t len, struct async_submit_ctl *submit);
170 struct dma_async_tx_descriptor *
171 async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
172 int src_cnt, size_t len, enum sum_check_flags *result,
173 struct async_submit_ctl *submit);
175 struct dma_async_tx_descriptor *
176 async_xor_val_offs(struct page *dest, unsigned int offset,
177 struct page **src_list, unsigned int *src_offset,
178 int src_cnt, size_t len, enum sum_check_flags *result,
179 struct async_submit_ctl *submit);
181 struct dma_async_tx_descriptor *
182 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
183 unsigned int src_offset, size_t len,
184 struct async_submit_ctl *submit);
186 struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit);
188 struct dma_async_tx_descriptor *
189 async_gen_syndrome(struct page **blocks, unsigned int *offsets, int src_cnt,
190 size_t len, struct async_submit_ctl *submit);
192 struct dma_async_tx_descriptor *
193 async_syndrome_val(struct page **blocks, unsigned int *offsets, int src_cnt,
194 size_t len, enum sum_check_flags *pqres, struct page *spare,
195 unsigned int s_off, struct async_submit_ctl *submit);
197 struct dma_async_tx_descriptor *
198 async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb,
199 struct page **ptrs, unsigned int *offs,
200 struct async_submit_ctl *submit);
202 struct dma_async_tx_descriptor *
203 async_raid6_datap_recov(int src_num, size_t bytes, int faila,
204 struct page **ptrs, unsigned int *offs,
205 struct async_submit_ctl *submit);
207 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
208 #endif /* _ASYNC_TX_H_ */