#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/raid/xor.h>
#include <linux/async_tx.h>

Functions
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)

	EXPORT_SYMBOL_GPL (async_xor)

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)

	EXPORT_SYMBOL_GPL (async_xor_val)

	MODULE_AUTHOR ("Intel Corporation")

	MODULE_DESCRIPTION ("asynchronous xor/xor-zero-sum api")

	MODULE_LICENSE ("GPL")

Function Documentation

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
	)

read

async_xor - attempt to xor a set of blocks with a dma engine. : destination page : array of source pages : common src/dst offset to start transaction : number of source pages : length in bytes : submission / completion modifiers

honored flags: ASYNC_TX_ACK, ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DST

xor_blocks always uses the dest as a source so the ASYNC_TX_XOR_ZERO_DST flag must be set to not include dest data in the calculation. The assumption with dma eninges is that they only use the destination buffer as a source when it is explicity specified in the source list.

src_list note: if the dest is also a source it must be at index zero. The contents of this array will be overwritten if a scribble region is not specified.

Definition at line 186 of file async_xor.c.

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
	)

read

async_xor_val - attempt a xor parity check with a dma engine. : destination page used if the xor is performed synchronously : array of source pages : offset in pages to start transaction : number of source pages : length in bytes

Returns: : 0 if sum == 0 else non-zero : submission / completion modifiers

honored flags: ASYNC_TX_ACK

src_list note: if the dest is also a source it must be at index zero. The contents of this array will be overwritten if a scribble region is not specified.

Definition at line 266 of file async_xor.c.

EXPORT_SYMBOL_GPL ( async_xor )

EXPORT_SYMBOL_GPL ( async_xor_val )

MODULE_AUTHOR ( "Intel Corporation" )

MODULE_DESCRIPTION ( "asynchronous xor/xor-zero-sum api" )

MODULE_LICENSE ( "GPL" )

Functions

Function Documentation