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  * 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_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);
169 
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);
174 
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);
180 
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);
185 
186 struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit);
187 
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);
191 
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);
196 
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);
201 
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);
206 
207 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
208 #endif /* _ASYNC_TX_H_ */
209