[linux-2.6-block.git] / include / linux / async_tx.h

/*
 * 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>

/**
 * 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_ASSUME_COHERENT: skip cache maintenance operations
 * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
 * dependency chain
 * @ASYNC_TX_DEP_ACK: ack the dependency descriptor.  Useful for chaining.
 */
enum async_tx_flags {
	ASYNC_TX_XOR_ZERO_DST	 = (1 << 0),
	ASYNC_TX_XOR_DROP_DST	 = (1 << 1),
	ASYNC_TX_ASSUME_COHERENT = (1 << 2),
	ASYNC_TX_ACK		 = (1 << 3),
	ASYNC_TX_DEP_ACK	 = (1 << 4),
};

#ifdef CONFIG_DMA_ENGINE
void async_tx_issue_pending_all(void);
enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx);
struct dma_chan *
async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
	enum dma_transaction_type tx_type);
#else
static inline void async_tx_issue_pending_all(void)
{
	do { } while (0);
}

static inline enum dma_status
dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
{
	return DMA_SUCCESS;
}

static inline void
async_tx_run_dependencies(struct dma_async_tx_descriptor *tx,
	struct dma_chan *host_chan)
{
	do { } while (0);
}

static inline struct dma_chan *
async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
	enum dma_transaction_type tx_type)
{
	return NULL;
}
#endif

/**
 * async_tx_sync_epilog - actions to take if an operation is run synchronously
 * @flags: async_tx flags
 * @depend_tx: transaction depends on depend_tx
 * @cb_fn: function to call when the transaction completes
 * @cb_fn_param: parameter to pass to the callback routine
 */
static inline void
async_tx_sync_epilog(unsigned long flags,
	struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param)
{
	if (cb_fn)
		cb_fn(cb_fn_param);

	if (depend_tx && (flags & ASYNC_TX_DEP_ACK))
		async_tx_ack(depend_tx);
}

void
async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param);

struct dma_async_tx_descriptor *
async_xor(struct page *dest, struct page **src_list, unsigned int offset,
	int src_cnt, size_t len, enum async_tx_flags flags,
	struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param);

struct dma_async_tx_descriptor *
async_xor_zero_sum(struct page *dest, struct page **src_list,
	unsigned int offset, int src_cnt, size_t len,
	u32 *result, enum async_tx_flags flags,
	struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param);

struct dma_async_tx_descriptor *
async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
	unsigned int src_offset, size_t len, enum async_tx_flags flags,
	struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param);

struct dma_async_tx_descriptor *
async_memset(struct page *dest, int val, unsigned int offset,
	size_t len, enum async_tx_flags flags,
	struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param);

struct dma_async_tx_descriptor *
async_trigger_callback(enum async_tx_flags flags,
	struct dma_async_tx_descriptor *depend_tx,
	dma_async_tx_callback cb_fn, void *cb_fn_param);
#endif /* _ASYNC_TX_H_ */
Commit	Line	Data
9bc89cd8 DW	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	/**
	25	* dma_chan_ref - object used to manage dma channels received from the
	26	* dmaengine core.
	27	* @chan - the channel being tracked
	28	* @node - node for the channel to be placed on async_tx_master_list
	29	* @rcu - for list_del_rcu
	30	* @count - number of times this channel is listed in the pool
	31	* (for channels with multiple capabiities)
	32	*/
	33	struct dma_chan_ref {
	34	struct dma_chan *chan;
	35	struct list_head node;
	36	struct rcu_head rcu;
	37	atomic_t count;
	38	};
	39
	40	/**
	41	* async_tx_flags - modifiers for the async_* calls
	42	* @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
	43	* the destination address is not a source. The asynchronous case handles this
	44	* implicitly, the synchronous case needs to zero the destination block.
	45	* @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
	46	* also one of the source addresses. In the synchronous case the destination
	47	* address is an implied source, whereas the asynchronous case it must be listed
	48	* as a source. The destination address must be the first address in the source
	49	* array.
	50	* @ASYNC_TX_ASSUME_COHERENT: skip cache maintenance operations
	51	* @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
	52	* dependency chain
	53	* @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining.
9bc89cd8 DW	54	*/
	55	enum async_tx_flags {
	56	ASYNC_TX_XOR_ZERO_DST = (1 << 0),
	57	ASYNC_TX_XOR_DROP_DST = (1 << 1),
	58	ASYNC_TX_ASSUME_COHERENT = (1 << 2),
	59	ASYNC_TX_ACK = (1 << 3),
	60	ASYNC_TX_DEP_ACK = (1 << 4),
9bc89cd8 DW	61	};
	62
	63	#ifdef CONFIG_DMA_ENGINE
	64	void async_tx_issue_pending_all(void);
	65	enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
	66	void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx);
	67	struct dma_chan *
	68	async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
	69	enum dma_transaction_type tx_type);
	70	#else
	71	static inline void async_tx_issue_pending_all(void)
	72	{
	73	do { } while (0);
	74	}
	75
	76	static inline enum dma_status
	77	dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
	78	{
	79	return DMA_SUCCESS;
	80	}
	81
	82	static inline void
	83	async_tx_run_dependencies(struct dma_async_tx_descriptor *tx,
	84	struct dma_chan *host_chan)
	85	{
	86	do { } while (0);
	87	}
	88
	89	static inline struct dma_chan *
	90	async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
	91	enum dma_transaction_type tx_type)
	92	{
	93	return NULL;
	94	}
	95	#endif
	96
	97	/**
	98	* async_tx_sync_epilog - actions to take if an operation is run synchronously
	99	* @flags: async_tx flags
	100	* @depend_tx: transaction depends on depend_tx
	101	* @cb_fn: function to call when the transaction completes
	102	* @cb_fn_param: parameter to pass to the callback routine
	103	*/
	104	static inline void
	105	async_tx_sync_epilog(unsigned long flags,
	106	struct dma_async_tx_descriptor *depend_tx,
	107	dma_async_tx_callback cb_fn, void *cb_fn_param)
	108	{
	109	if (cb_fn)
	110	cb_fn(cb_fn_param);
	111
	112	if (depend_tx && (flags & ASYNC_TX_DEP_ACK))
	113	async_tx_ack(depend_tx);
	114	}
	115
	116	void
	117	async_tx_submit(struct dma_chan chan, struct dma_async_tx_descriptor tx,
	118	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
	119	dma_async_tx_callback cb_fn, void *cb_fn_param);
	120
	121	struct dma_async_tx_descriptor *
	122	async_xor(struct page dest, struct page *src_list, unsigned int offset,
	123	int src_cnt, size_t len, enum async_tx_flags flags,
	124	struct dma_async_tx_descriptor *depend_tx,
125	dma_async_tx_callback cb_fn, void *cb_fn_param);
126
127	struct dma_async_tx_descriptor *
128	async_xor_zero_sum(struct page dest, struct page *src_list,
129	unsigned int offset, int src_cnt, size_t len,
130	u32 *result, enum async_tx_flags flags,
131	struct dma_async_tx_descriptor *depend_tx,
132	dma_async_tx_callback cb_fn, void *cb_fn_param);
133
134	struct dma_async_tx_descriptor *
135	async_memcpy(struct page dest, struct page src, unsigned int dest_offset,
136	unsigned int src_offset, size_t len, enum async_tx_flags flags,
137	struct dma_async_tx_descriptor *depend_tx,
138	dma_async_tx_callback cb_fn, void *cb_fn_param);
139
140	struct dma_async_tx_descriptor *
141	async_memset(struct page *dest, int val, unsigned int offset,
142	size_t len, enum async_tx_flags flags,
143	struct dma_async_tx_descriptor *depend_tx,
144	dma_async_tx_callback cb_fn, void *cb_fn_param);
145
146	struct dma_async_tx_descriptor *
147	async_trigger_callback(enum async_tx_flags flags,
148	struct dma_async_tx_descriptor *depend_tx,
149	dma_async_tx_callback cb_fn, void *cb_fn_param);
150	#endif /* _ASYNC_TX_H_ */