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  * @ASYNC_TX_PQ_XOR_DST: do not overwrite the syndrome but XOR it with the
  64  * input data. Required for rmw case.
  65  */
  66 enum async_tx_flags {
  67         ASYNC_TX_XOR_ZERO_DST    = (1 << 0),
  68         ASYNC_TX_XOR_DROP_DST    = (1 << 1),
  69         ASYNC_TX_ACK             = (1 << 2),
  70         ASYNC_TX_FENCE           = (1 << 3),
  71         ASYNC_TX_PQ_XOR_DST      = (1 << 4),
  72 };
  73
  74 /**
  75  * struct async_submit_ctl - async_tx submission/completion modifiers
  76  * @flags: submission modifiers
  77  * @depend_tx: parent dependency of the current operation being submitted
  78  * @cb_fn: callback routine to run at operation completion
  79  * @cb_param: parameter for the callback routine
  80  * @scribble: caller provided space for dma/page address conversions
  81  */
  82 struct async_submit_ctl {
  83         enum async_tx_flags flags;
  84         struct dma_async_tx_descriptor *depend_tx;
  85         dma_async_tx_callback cb_fn;
  86         void *cb_param;
  87         void *scribble;
  88 };
  89
  90 #ifdef CONFIG_DMA_ENGINE
  91 #define async_tx_issue_pending_all dma_issue_pending_all
  92
  93 /**
  94  * async_tx_issue_pending - send pending descriptor to the hardware channel
  95  * @tx: descriptor handle to retrieve hardware context
  96  *
  97  * Note: any dependent operations will have already been issued by
  98  * async_tx_channel_switch, or (in the case of no channel switch) will
  99  * be already pending on this channel.
 100  */
 101 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
 102 {
 103         if (likely(tx)) {
 104                 struct dma_chan *chan = tx->chan;
 105                 struct dma_device *dma = chan->device;
 106
 107                 dma->device_issue_pending(chan);
 108         }
 109 }
 110 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
 111 #include <asm/async_tx.h>
 112 #else
 113 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
 114          __async_tx_find_channel(dep, type)
 115 struct dma_chan *
 116 __async_tx_find_channel(struct async_submit_ctl *submit,
 117                         enum dma_transaction_type tx_type);
 118 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
 119 #else
 120 static inline void async_tx_issue_pending_all(void)
 121 {
 122         do { } while (0);
 123 }
 124
 125 static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
 126 {
 127         do { } while (0);
 128 }
 129
 130 static inline struct dma_chan *
 131 async_tx_find_channel(struct async_submit_ctl *submit,
 132                       enum dma_transaction_type tx_type, struct page **dst,
 133                       int dst_count, struct page **src, int src_count,
 134                       size_t len)
 135 {
 136         return NULL;
 137 }
 138 #endif
 139
 140 /**
 141  * async_tx_sync_epilog - actions to take if an operation is run synchronously
 142  * @cb_fn: function to call when the transaction completes
 143  * @cb_fn_param: parameter to pass to the callback routine
 144  */
 145 static inline void
 146 async_tx_sync_epilog(struct async_submit_ctl *submit)
 147 {
 148         if (submit->cb_fn)
 149                 submit->cb_fn(submit->cb_param);
 150 }
 151
 152 typedef union {
 153         unsigned long addr;
 154         struct page *page;
 155         dma_addr_t dma;
 156 } addr_conv_t;
 157
 158 static inline void
 159 init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags,
 160                   struct dma_async_tx_descriptor *tx,
 161                   dma_async_tx_callback cb_fn, void *cb_param,
 162                   addr_conv_t *scribble)
 163 {
 164         args->flags = flags;
 165         args->depend_tx = tx;
 166         args->cb_fn = cb_fn;
 167         args->cb_param = cb_param;
 168         args->scribble = scribble;
 169 }
 170
 171 void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
 172                      struct async_submit_ctl *submit);
 173
 174 struct dma_async_tx_descriptor *
 175 async_xor(struct page *dest, struct page **src_list, unsigned int offset,
 176           int src_cnt, size_t len, struct async_submit_ctl *submit);
 177
 178 struct dma_async_tx_descriptor *
 179 async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
 180               int src_cnt, size_t len, enum sum_check_flags *result,
 181               struct async_submit_ctl *submit);
 182
 183 struct dma_async_tx_descriptor *
 184 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 185              unsigned int src_offset, size_t len,
 186              struct async_submit_ctl *submit);
 187
 188 struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit);
 189
 190 struct dma_async_tx_descriptor *
 191 async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt,
 192                    size_t len, struct async_submit_ctl *submit);
 193
 194 struct dma_async_tx_descriptor *
 195 async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt,
 196                    size_t len, enum sum_check_flags *pqres, struct page *spare,
 197                    struct async_submit_ctl *submit);
 198
 199 struct dma_async_tx_descriptor *
 200 async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb,
 201                         struct page **ptrs, struct async_submit_ctl *submit);
 202
 203 struct dma_async_tx_descriptor *
 204 async_raid6_datap_recov(int src_num, size_t bytes, int faila,
 205                         struct page **ptrs, struct async_submit_ctl *submit);
 206
 207 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
 208 #endif /* _ASYNC_TX_H_ */