1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright © 2006, Intel Corporation.
4 */
5 #ifndef _ASYNC_TX_H_
6 #define _ASYNC_TX_H_
7 #include <linux/dmaengine.h>
8 #include <linux/spinlock.h>
9 #include <linux/interrupt.h>
10
11 /* on architectures without dma-mapping capabilities we need to ensure
12 * that the asynchronous path compiles away
13 */
14 #ifdef CONFIG_HAS_DMA
15 #define __async_inline
16 #else
17 #define __async_inline __always_inline
18 #endif
19
20 /**
21 * dma_chan_ref - object used to manage dma channels received from the
22 * dmaengine core.
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)
28 */
29 struct dma_chan_ref {
30 struct dma_chan *chan;
31 struct list_head node;
32 struct rcu_head rcu;
33 atomic_t count;
34 };
35
36 /**
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 * the 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
45 * array.
46 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
47 * dependency chain
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.
52 */
53 enum async_tx_flags {
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),
59 };
60
61 /**
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
68 */
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;
73 void *cb_param;
74 void *scribble;
75 };
76
77 #if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH)
78 #define async_tx_issue_pending_all dma_issue_pending_all
79
80 /**
81 * async_tx_issue_pending - send pending descriptor to the hardware channel
82 * @tx: descriptor handle to retrieve hardware context
83 *
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.
87 */
async_tx_issue_pending(struct dma_async_tx_descriptor * tx)88 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
89 {
90 if (likely(tx)) {
91 struct dma_chan *chan = tx->chan;
92 struct dma_device *dma = chan->device;
93
94 dma->device_issue_pending(chan);
95 }
96 }
97 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
98 #include <asm/async_tx.h>
99 #else
100 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
101 __async_tx_find_channel(dep, type)
102 struct dma_chan *
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 */
106 #else
async_tx_issue_pending_all(void)107 static inline void async_tx_issue_pending_all(void)
108 {
109 do { } while (0);
110 }
111
async_tx_issue_pending(struct dma_async_tx_descriptor * tx)112 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
113 {
114 do { } while (0);
115 }
116
117 static inline struct dma_chan *
async_tx_find_channel(struct async_submit_ctl * submit,enum dma_transaction_type tx_type,struct page ** dst,int dst_count,struct page ** src,int src_count,size_t len)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,
121 size_t len)
122 {
123 return NULL;
124 }
125 #endif
126
127 /**
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
131 */
132 static inline void
async_tx_sync_epilog(struct async_submit_ctl * submit)133 async_tx_sync_epilog(struct async_submit_ctl *submit)
134 {
135 if (submit->cb_fn)
136 submit->cb_fn(submit->cb_param);
137 }
138
139 typedef union {
140 unsigned long addr;
141 struct page *page;
142 dma_addr_t dma;
143 } addr_conv_t;
144
145 static inline void
init_async_submit(struct async_submit_ctl * args,enum async_tx_flags flags,struct dma_async_tx_descriptor * tx,dma_async_tx_callback cb_fn,void * cb_param,addr_conv_t * scribble)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)
150 {
151 args->flags = flags;
152 args->depend_tx = tx;
153 args->cb_fn = cb_fn;
154 args->cb_param = cb_param;
155 args->scribble = scribble;
156 }
157
158 void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
159 struct async_submit_ctl *submit);
160
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);
164
165 struct dma_async_tx_descriptor *
166 async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
167 int src_cnt, size_t len, enum sum_check_flags *result,
168 struct async_submit_ctl *submit);
169
170 struct dma_async_tx_descriptor *
171 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
172 unsigned int src_offset, size_t len,
173 struct async_submit_ctl *submit);
174
175 struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit);
176
177 struct dma_async_tx_descriptor *
178 async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt,
179 size_t len, struct async_submit_ctl *submit);
180
181 struct dma_async_tx_descriptor *
182 async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt,
183 size_t len, enum sum_check_flags *pqres, struct page *spare,
184 struct async_submit_ctl *submit);
185
186 struct dma_async_tx_descriptor *
187 async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb,
188 struct page **ptrs, struct async_submit_ctl *submit);
189
190 struct dma_async_tx_descriptor *
191 async_raid6_datap_recov(int src_num, size_t bytes, int faila,
192 struct page **ptrs, struct async_submit_ctl *submit);
193
194 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
195 #endif /* _ASYNC_TX_H_ */
196
