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 #ifdef CONFIG_DMA_ENGINE 69 #define async_tx_issue_pending_all dma_issue_pending_all 70 #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL 71 #include <asm/async_tx.h> 72 #else 73 #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \ 74 __async_tx_find_channel(dep, type) 75 struct dma_chan * 76 __async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, 77 enum dma_transaction_type tx_type); 78 #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */ 79 #else 80 static inline void async_tx_issue_pending_all(void) 81 { 82 do { } while (0); 83 } 84 85 static inline struct dma_chan * 86 async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, 87 enum dma_transaction_type tx_type, struct page **dst, int dst_count, 88 struct page **src, int src_count, size_t len) 89 { 90 return NULL; 91 } 92 #endif 93 94 /** 95 * async_tx_sync_epilog - actions to take if an operation is run synchronously 96 * @cb_fn: function to call when the transaction completes 97 * @cb_fn_param: parameter to pass to the callback routine 98 */ 99 static inline void 100 async_tx_sync_epilog(dma_async_tx_callback cb_fn, void *cb_fn_param) 101 { 102 if (cb_fn) 103 cb_fn(cb_fn_param); 104 } 105 106 void 107 async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, 108 enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, 109 dma_async_tx_callback cb_fn, void *cb_fn_param); 110 111 struct dma_async_tx_descriptor * 112 async_xor(struct page *dest, struct page **src_list, unsigned int offset, 113 int src_cnt, size_t len, 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_xor_val(struct page *dest, struct page **src_list, 119 unsigned int offset, int src_cnt, size_t len, 120 u32 *result, enum async_tx_flags flags, 121 struct dma_async_tx_descriptor *depend_tx, 122 dma_async_tx_callback cb_fn, void *cb_fn_param); 123 124 struct dma_async_tx_descriptor * 125 async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, 126 unsigned int src_offset, size_t len, enum async_tx_flags flags, 127 struct dma_async_tx_descriptor *depend_tx, 128 dma_async_tx_callback cb_fn, void *cb_fn_param); 129 130 struct dma_async_tx_descriptor * 131 async_memset(struct page *dest, int val, unsigned int offset, 132 size_t len, enum async_tx_flags flags, 133 struct dma_async_tx_descriptor *depend_tx, 134 dma_async_tx_callback cb_fn, void *cb_fn_param); 135 136 struct dma_async_tx_descriptor * 137 async_trigger_callback(enum async_tx_flags flags, 138 struct dma_async_tx_descriptor *depend_tx, 139 dma_async_tx_callback cb_fn, void *cb_fn_param); 140 141 void async_tx_quiesce(struct dma_async_tx_descriptor **tx); 142 #endif /* _ASYNC_TX_H_ */ 143