b219b3f732
typedef SG_BUFFER_LIST is removed and its uses are replaced by the use of struct scatterlist. Signed-off-by: Nicolas Palix <npalix@diku.dk> Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#ifndef _RING_BUFFER_H_
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#define _RING_BUFFER_H_
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#include <linux/scatterlist.h>
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#include "include/osd.h"
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typedef struct _RING_BUFFER {
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volatile u32 WriteIndex; /* Offset in bytes from the start of ring data below */
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volatile u32 ReadIndex; /* Offset in bytes from the start of ring data below */
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volatile u32 InterruptMask;
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u8 Reserved[4084]; /* Pad it to PAGE_SIZE so that data starts on page boundary */
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/* NOTE: The InterruptMask field is used only for channels but since our vmbus connection */
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/* also uses this data structure and its data starts here, we commented out this field. */
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/* volatile u32 InterruptMask; */
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/* Ring data starts here + RingDataStartOffset !!! DO NOT place any fields below this !!! */
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u8 Buffer[0];
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} __attribute__((packed)) RING_BUFFER;
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typedef struct _RING_BUFFER_INFO {
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RING_BUFFER* RingBuffer;
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u32 RingSize; /* Include the shared header */
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spinlock_t ring_lock;
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u32 RingDataSize; /* < ringSize */
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u32 RingDataStartOffset;
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} RING_BUFFER_INFO;
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typedef struct _RING_BUFFER_DEBUG_INFO {
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u32 CurrentInterruptMask;
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u32 CurrentReadIndex;
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u32 CurrentWriteIndex;
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u32 BytesAvailToRead;
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u32 BytesAvailToWrite;
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}RING_BUFFER_DEBUG_INFO;
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/* Interface */
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static int
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RingBufferInit(
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RING_BUFFER_INFO *RingInfo,
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void * Buffer,
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u32 BufferLen
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);
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static void
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RingBufferCleanup(
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RING_BUFFER_INFO *RingInfo
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);
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static int
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RingBufferWrite(
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RING_BUFFER_INFO *RingInfo,
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struct scatterlist *sglist,
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u32 sgcount
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);
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static int
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RingBufferPeek(
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RING_BUFFER_INFO *RingInfo,
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void * Buffer,
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u32 BufferLen
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);
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static int
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RingBufferRead(
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RING_BUFFER_INFO *RingInfo,
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void * Buffer,
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u32 BufferLen,
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u32 Offset
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);
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static u32
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GetRingBufferInterruptMask(
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RING_BUFFER_INFO *RingInfo
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);
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static void
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DumpRingInfo(
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RING_BUFFER_INFO* RingInfo,
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char *Prefix
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);
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static void
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RingBufferGetDebugInfo(
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RING_BUFFER_INFO *RingInfo,
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RING_BUFFER_DEBUG_INFO *DebugInfo
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);
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#endif /* _RING_BUFFER_H_ */
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