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 /* on architectures without dma-mapping capabilities we need to ensure
  25  * that the asynchronous path compiles away
  26  */
  27 #ifdef CONFIG_HAS_DMA
  28 #define __async_inline
  29 #else
  30 #define __async_inline __always_inline
  31 #endif
  32
  33 /**
  34  * dma_chan_ref - object used to manage dma channels received from the
  35  *   dmaengine core.
  36  * @chan - the channel being tracked
  37  * @node - node for the channel to be placed on async_tx_master_list
  38  * @rcu - for list_del_rcu
  39  * @count - number of times this channel is listed in the pool
  40  *      (for channels with multiple capabiities)
  41  */
  42 struct dma_chan_ref {
  43         struct dma_chan *chan;
  44         struct list_head node;
  45         struct rcu_head rcu;
  46         atomic_t count;
  47 };
  48
  49 /**
  50  * async_tx_flags - modifiers for the async_* calls
  51  * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
  52  * the destination address is not a source.  The asynchronous case handles this
  53  * implicitly, the synchronous case needs to zero the destination block.
  54  * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
  55  * also one of the source addresses.  In the synchronous case the destination
  56  * address is an implied source, whereas the asynchronous case it must be listed
  57  * as a source.  The destination address must be the first address in the source
  58  * array.
  59  * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
  60  * dependency chain
  61  */
  62 enum async_tx_flags {
  63         ASYNC_TX_XOR_ZERO_DST    = (1 << 0),
  64         ASYNC_TX_XOR_DROP_DST    = (1 << 1),
  65         ASYNC_TX_ACK             = (1 << 2),
  66 };
  67
  68 /**
  69  * struct async_submit_ctl - async_tx submission/completion modifiers
  70  * @flags: submission modifiers
  71  * @depend_tx: parent dependency of the current operation being submitted
  72  * @cb_fn: callback routine to run at operation completion
  73  * @cb_param: parameter for the callback routine
  74  * @scribble: caller provided space for dma/page address conversions
  75  */
  76 struct async_submit_ctl {
  77         enum async_tx_flags flags;
  78         struct dma_async_tx_descriptor *depend_tx;
  79         dma_async_tx_callback cb_fn;
  80         void *cb_param;
  81         void *scribble;
  82 };
  83
  84 #ifdef CONFIG_DMA_ENGINE
  85 #define async_tx_issue_pending_all dma_issue_pending_all
  86
  87 /**
  88  * async_tx_issue_pending - send pending descriptor to the hardware channel
  89  * @tx: descriptor handle to retrieve hardware context
  90  *
  91  * Note: any dependent operations will have already been issued by
  92  * async_tx_channel_switch, or (in the case of no channel switch) will
  93  * be already pending on this channel.
  94  */
  95 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
  96 {
  97         if (likely(tx)) {
  98                 struct dma_chan *chan = tx->chan;
  99                 struct dma_device *dma = chan->device;
 100
 101                 dma->device_issue_pending(chan);
 102         }
 103 }
 104 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
 105 #include <asm/async_tx.h>
 106 #else
 107 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
 108          __async_tx_find_channel(dep, type)
 109 struct dma_chan *
 110 __async_tx_find_channel(struct async_submit_ctl *submit,
 111                         enum dma_transaction_type tx_type);
 112 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
 113 #else
 114 static inline void async_tx_issue_pending_all(void)
 115 {
 116         do { } while (0);
 117 }
 118
 119 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
 120 {
 121         do { } while (0);
 122 }
 123
 124 static inline struct dma_chan *
 125 async_tx_find_channel(struct async_submit_ctl *submit,
 126                       enum dma_transaction_type tx_type, struct page **dst,
 127                       int dst_count, struct page **src, int src_count,
 128                       size_t len)
 129 {
 130         return NULL;
 131 }
 132 #endif
 133
 134 /**
 135  * async_tx_sync_epilog - actions to take if an operation is run synchronously
 136  * @cb_fn: function to call when the transaction completes
 137  * @cb_fn_param: parameter to pass to the callback routine
 138  */
 139 static inline void
 140 async_tx_sync_epilog(struct async_submit_ctl *submit)
 141 {
 142         if (submit->cb_fn)
 143                 submit->cb_fn(submit->cb_param);
 144 }
 145
 146 typedef union {
 147         unsigned long addr;
 148         struct page *page;
 149         dma_addr_t dma;
 150 } addr_conv_t;
 151
 152 static inline void
 153 init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags,
 154                   struct dma_async_tx_descriptor *tx,
 155                   dma_async_tx_callback cb_fn, void *cb_param,
 156                   addr_conv_t *scribble)
 157 {
 158         args->flags = flags;
 159         args->depend_tx = tx;
 160         args->cb_fn = cb_fn;
 161         args->cb_param = cb_param;
 162         args->scribble = scribble;
 163 }
 164
 165 void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
 166                      struct async_submit_ctl *submit);
 167
 168 struct dma_async_tx_descriptor *
 169 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
 170           int src_cnt, size_t len, struct async_submit_ctl *submit);
 171
 172 struct dma_async_tx_descriptor *
 173 async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
 174               int src_cnt, size_t len, enum sum_check_flags *result,
 175               struct async_submit_ctl *submit);
 176
 177 struct dma_async_tx_descriptor *
 178 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 179              unsigned int src_offset, size_t len,
 180              struct async_submit_ctl *submit);
 181
 182 struct dma_async_tx_descriptor *
 183 async_memset(struct page *dest, int val, unsigned int offset,
 184              size_t len, 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 offset, 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 offset, int src_cnt,
 194                    size_t len, enum sum_check_flags *pqres, struct page *spare,
 195                    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, struct async_submit_ctl *submit);
 200
 201 struct dma_async_tx_descriptor *
 202 async_raid6_datap_recov(int src_num, size_t bytes, int faila,
 203                         struct page **ptrs, struct async_submit_ctl *submit);
 204
 205 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
 206 #endif /* _ASYNC_TX_H_ */