/* * Copyright © 2006, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * */#ifndef _ASYNC_TX_H_#define _ASYNC_TX_H_#include <linux/dmaengine.h>#include <linux/spinlock.h>#include <linux/interrupt.h> /* on architectures without dma-mapping capabilities we need to ensure * that the asynchronous path compiles away */#ifdef CONFIG_HAS_DMA#define __async_inline#else#define __async_inline __always_inline#endif /** * dma_chan_ref - object used to manage dma channels received from the *   dmaengine core. * @chan - the channel being tracked * @node - node for the channel to be placed on async_tx_master_list * @rcu - for list_del_rcu * @count - number of times this channel is listed in the pool *	(for channels with multiple capabiities) */struct dma_chan_ref {	struct dma_chan *chan;	struct list_head node;	struct rcu_head rcu;	atomic_t count;}; /** * async_tx_flags - modifiers for the async_* calls * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the * the destination address is not a source.  The asynchronous case handles this * implicitly, the synchronous case needs to zero the destination block. * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is * also one of the source addresses.  In the synchronous case the destination * address is an implied source, whereas the asynchronous case it must be listed * as a source.  The destination address must be the first address in the source * array. * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a * dependency chain * @ASYNC_TX_FENCE: specify that the next operation in the dependency * chain uses this operation's result as an input * @ASYNC_TX_PQ_XOR_DST: do not overwrite the syndrome but XOR it with the * input data. Required for rmw case. */enum async_tx_flags {	ASYNC_TX_XOR_ZERO_DST	 = (1 << 0),	ASYNC_TX_XOR_DROP_DST	 = (1 << 1),	ASYNC_TX_ACK		 = (1 << 2),	ASYNC_TX_FENCE		 = (1 << 3),	ASYNC_TX_PQ_XOR_DST	 = (1 << 4),}; /** * struct async_submit_ctl - async_tx submission/completion modifiers * @flags: submission modifiers * @depend_tx: parent dependency of the current operation being submitted * @cb_fn: callback routine to run at operation completion * @cb_param: parameter for the callback routine * @scribble: caller provided space for dma/page address conversions */struct async_submit_ctl {	enum async_tx_flags flags;	struct dma_async_tx_descriptor *depend_tx;	dma_async_tx_callback cb_fn;	void *cb_param;	void *scribble;}; #if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH)#define async_tx_issue_pending_all dma_issue_pending_all /** * async_tx_issue_pending - send pending descriptor to the hardware channel * @tx: descriptor handle to retrieve hardware context * * Note: any dependent operations will have already been issued by * async_tx_channel_switch, or (in the case of no channel switch) will * be already pending on this channel. */static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx){	if (likely(tx)) {		struct dma_chan *chan = tx->chan;		struct dma_device *dma = chan->device; 		dma->device_issue_pending(chan);	}}#ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL#include <asm/async_tx.h>#else#define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \	 __async_tx_find_channel(dep, type)struct dma_chan *__async_tx_find_channel(struct async_submit_ctl *submit,			enum dma_transaction_type tx_type);#endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */#elsestatic inline void async_tx_issue_pending_all(void){	do { } while (0);} static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx){	do { } while (0);} static inline struct dma_chan *async_tx_find_channel(struct async_submit_ctl *submit,		      enum dma_transaction_type tx_type, struct page **dst,		      int dst_count, struct page **src, int src_count,		      size_t len){	return NULL;}#endif /** * async_tx_sync_epilog - actions to take if an operation is run synchronously * @cb_fn: function to call when the transaction completes * @cb_fn_param: parameter to pass to the callback routine */static inline voidasync_tx_sync_epilog(struct async_submit_ctl *submit){	if (submit->cb_fn)		submit->cb_fn(submit->cb_param);} typedef union {	unsigned long addr;	struct page *page;	dma_addr_t dma;} addr_conv_t; static inline voidinit_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags,		  struct dma_async_tx_descriptor *tx,		  dma_async_tx_callback cb_fn, void *cb_param,		  addr_conv_t *scribble){	args->flags = flags;	args->depend_tx = tx;	args->cb_fn = cb_fn;	args->cb_param = cb_param;	args->scribble = scribble;} void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,		     struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_xor(struct page *dest, struct page **src_list, unsigned int offset,	  int src_cnt, size_t len, struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,	      int src_cnt, size_t len, enum sum_check_flags *result,	      struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,	     unsigned int src_offset, size_t len,	     struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt,		   size_t len, struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt,		   size_t len, enum sum_check_flags *pqres, struct page *spare,		   struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb,			struct page **ptrs, struct async_submit_ctl *submit); struct dma_async_tx_descriptor *async_raid6_datap_recov(int src_num, size_t bytes, int faila,			struct page **ptrs, struct async_submit_ctl *submit); void async_tx_quiesce(struct dma_async_tx_descriptor **tx);#endif /* _ASYNC_TX_H_ */