include/linux/async_tx.h

   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  */
  33 struct 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_ACK: immediately ack the descriptor, precludes setting up a
  51  * dependency chain
  52  * @ASYNC_TX_DEP_ACK: ack the dependency descriptor.  Useful for chaining.
  53  */
  54 enum async_tx_flags {
  55         ASYNC_TX_XOR_ZERO_DST    = (1 << 0),
  56         ASYNC_TX_XOR_DROP_DST    = (1 << 1),
  57         ASYNC_TX_ACK             = (1 << 3),
  58         ASYNC_TX_DEP_ACK         = (1 << 4),
  59 };
  60
  61 #ifdef CONFIG_DMA_ENGINE
  62 #define async_tx_issue_pending_all dma_issue_pending_all
  63 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
  64 #include <asm/async_tx.h>
  65 #else
  66 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
  67          __async_tx_find_channel(dep, type)
  68 struct dma_chan *
  69 __async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
  70         enum dma_transaction_type tx_type);
  71 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
  72 #else
  73 static inline void async_tx_issue_pending_all(void)
  74 {
  75         do { } while (0);
  76 }
  77
  78 static inline struct dma_chan *
  79 async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
  80         enum dma_transaction_type tx_type, struct page **dst, int dst_count,
  81         struct page **src, int src_count, size_t len)
  82 {
  83         return NULL;
  84 }
  85 #endif
  86
  87 /**
  88  * async_tx_sync_epilog - actions to take if an operation is run synchronously
  89  * @cb_fn: function to call when the transaction completes
  90  * @cb_fn_param: parameter to pass to the callback routine
  91  */
  92 static inline void
  93 async_tx_sync_epilog(dma_async_tx_callback cb_fn, void *cb_fn_param)
  94 {
  95         if (cb_fn)
  96                 cb_fn(cb_fn_param);
  97 }
  98
  99 void
 100 async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
 101         enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
 102         dma_async_tx_callback cb_fn, void *cb_fn_param);
 103
 104 struct dma_async_tx_descriptor *
 105 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
 106         int src_cnt, size_t len, enum async_tx_flags flags,
 107         struct dma_async_tx_descriptor *depend_tx,
 108         dma_async_tx_callback cb_fn, void *cb_fn_param);
 109
 110 struct dma_async_tx_descriptor *
 111 async_xor_zero_sum(struct page *dest, struct page **src_list,
 112         unsigned int offset, int src_cnt, size_t len,
 113         u32 *result, enum async_tx_flags flags,
 114         struct dma_async_tx_descriptor *depend_tx,
 115         dma_async_tx_callback cb_fn, void *cb_fn_param);
 116
 117 struct dma_async_tx_descriptor *
 118 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 119         unsigned int src_offset, size_t len, enum async_tx_flags flags,
 120         struct dma_async_tx_descriptor *depend_tx,
 121         dma_async_tx_callback cb_fn, void *cb_fn_param);
 122
 123 struct dma_async_tx_descriptor *
 124 async_memset(struct page *dest, int val, unsigned int offset,
 125         size_t len, enum async_tx_flags flags,
 126         struct dma_async_tx_descriptor *depend_tx,
 127         dma_async_tx_callback cb_fn, void *cb_fn_param);
 128
 129 struct dma_async_tx_descriptor *
 130 async_trigger_callback(enum async_tx_flags flags,
 131         struct dma_async_tx_descriptor *depend_tx,
 132         dma_async_tx_callback cb_fn, void *cb_fn_param);
 133
 134 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
 135 #endif /* _ASYNC_TX_H_ */