root/include/linux/async_tx.h

INCLUDED FROM

DEFINITIONS

1. async_tx_issue_pending
2. async_tx_issue_pending_all
3. async_tx_issue_pending
4. async_tx_find_channel
5. async_tx_sync_epilog
6. init_async_submit

   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  */
  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
 107 static inline void async_tx_issue_pending_all(void)
 108 {
 109         do { } while (0);
 110 }
 111 
 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 *
 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
 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
 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_ */