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  * @ASYNC_TX_FENCE: specify that the next operation in the dependency
  62  * chain uses this operation's result as an input
  63  */
  64 enum async_tx_flags {
  65         ASYNC_TX_XOR_ZERO_DST    = (1 << 0),
  66         ASYNC_TX_XOR_DROP_DST    = (1 << 1),
  67         ASYNC_TX_ACK             = (1 << 2),
  68         ASYNC_TX_FENCE           = (1 << 3),
  69 };
  70
  71 /**
  72  * struct async_submit_ctl - async_tx submission/completion modifiers
  73  * @flags: submission modifiers
  74  * @depend_tx: parent dependency of the current operation being submitted
  75  * @cb_fn: callback routine to run at operation completion
  76  * @cb_param: parameter for the callback routine
  77  * @scribble: caller provided space for dma/page address conversions
  78  */
  79 struct async_submit_ctl {
  80         enum async_tx_flags flags;
  81         struct dma_async_tx_descriptor *depend_tx;
  82         dma_async_tx_callback cb_fn;
  83         void *cb_param;
  84         void *scribble;
  85 };
  86
  87 #ifdef CONFIG_DMA_ENGINE
  88 #define async_tx_issue_pending_all dma_issue_pending_all
  89
  90 /**
  91  * async_tx_issue_pending - send pending descriptor to the hardware channel
  92  * @tx: descriptor handle to retrieve hardware context
  93  *
  94  * Note: any dependent operations will have already been issued by
  95  * async_tx_channel_switch, or (in the case of no channel switch) will
  96  * be already pending on this channel.
  97  */
  98 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
  99 {
 100         if (likely(tx)) {
 101                 struct dma_chan *chan = tx->chan;
 102                 struct dma_device *dma = chan->device;
 103
 104                 dma->device_issue_pending(chan);
 105         }
 106 }
 107 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
 108 #include <asm/async_tx.h>
 109 #else
 110 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
 111          __async_tx_find_channel(dep, type)
 112 struct dma_chan *
 113 __async_tx_find_channel(struct async_submit_ctl *submit,
 114                         enum dma_transaction_type tx_type);
 115 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
 116 #else
 117 static inline void async_tx_issue_pending_all(void)
 118 {
 119         do { } while (0);
 120 }
 121
 122 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
 123 {
 124         do { } while (0);
 125 }
 126
 127 static inline struct dma_chan *
 128 async_tx_find_channel(struct async_submit_ctl *submit,
 129                       enum dma_transaction_type tx_type, struct page **dst,
 130                       int dst_count, struct page **src, int src_count,
 131                       size_t len)
 132 {
 133         return NULL;
 134 }
 135 #endif
 136
 137 /**
 138  * async_tx_sync_epilog - actions to take if an operation is run synchronously
 139  * @cb_fn: function to call when the transaction completes
 140  * @cb_fn_param: parameter to pass to the callback routine
 141  */
 142 static inline void
 143 async_tx_sync_epilog(struct async_submit_ctl *submit)
 144 {
 145         if (submit->cb_fn)
 146                 submit->cb_fn(submit->cb_param);
 147 }
 148
 149 typedef union {
 150         unsigned long addr;
 151         struct page *page;
 152         dma_addr_t dma;
 153 } addr_conv_t;
 154
 155 static inline void
 156 init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags,
 157                   struct dma_async_tx_descriptor *tx,
 158                   dma_async_tx_callback cb_fn, void *cb_param,
 159                   addr_conv_t *scribble)
 160 {
 161         args->flags = flags;
 162         args->depend_tx = tx;
 163         args->cb_fn = cb_fn;
 164         args->cb_param = cb_param;
 165         args->scribble = scribble;
 166 }
 167
 168 void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
 169                      struct async_submit_ctl *submit);
 170
 171 struct dma_async_tx_descriptor *
 172 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
 173           int src_cnt, size_t len, struct async_submit_ctl *submit);
 174
 175 struct dma_async_tx_descriptor *
 176 async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
 177               int src_cnt, size_t len, enum sum_check_flags *result,
 178               struct async_submit_ctl *submit);
 179
 180 struct dma_async_tx_descriptor *
 181 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 182              unsigned int src_offset, size_t len,
 183              struct async_submit_ctl *submit);
 184
 185 struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit);
 186
 187 struct dma_async_tx_descriptor *
 188 async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt,
 189                    size_t len, struct async_submit_ctl *submit);
 190
 191 struct dma_async_tx_descriptor *
 192 async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt,
 193                    size_t len, enum sum_check_flags *pqres, struct page *spare,
 194                    struct async_submit_ctl *submit);
 195
 196 struct dma_async_tx_descriptor *
 197 async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb,
 198                         struct page **ptrs, struct async_submit_ctl *submit);
 199
 200 struct dma_async_tx_descriptor *
 201 async_raid6_datap_recov(int src_num, size_t bytes, int faila,
 202                         struct page **ptrs, struct async_submit_ctl *submit);
 203
 204 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
 205 #endif /* _ASYNC_TX_H_ */