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author | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-05 22:22:35 -0700 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-11 11:36:16 -0700 |
commit | 8f078ca6e7e1a5457aef5196e7154aa468094120 (patch) | |
tree | 971d726391d3b96492ee531bd532bf30283e570d /drivers/staging/hv/ring_buffer.h | |
parent | 55e9643e6c486b589279576877838ffd8ed04a68 (diff) | |
download | op-kernel-dev-8f078ca6e7e1a5457aef5196e7154aa468094120.zip op-kernel-dev-8f078ca6e7e1a5457aef5196e7154aa468094120.tar.gz |
Staging: hv: rename RingBuffer.c and .h to ring_buffer.c and .h
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/hv/ring_buffer.h')
-rw-r--r-- | drivers/staging/hv/ring_buffer.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/staging/hv/ring_buffer.h b/drivers/staging/hv/ring_buffer.h new file mode 100644 index 0000000..6202157 --- /dev/null +++ b/drivers/staging/hv/ring_buffer.h @@ -0,0 +1,101 @@ +/* + * + * Copyright (c) 2009, Microsoft 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., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Haiyang Zhang <haiyangz@microsoft.com> + * Hank Janssen <hjanssen@microsoft.com> + * + */ + + +#ifndef _RING_BUFFER_H_ +#define _RING_BUFFER_H_ + +#include <linux/scatterlist.h> + +typedef struct _RING_BUFFER { + /* Offset in bytes from the start of ring data below */ + volatile u32 WriteIndex; + + /* Offset in bytes from the start of ring data below */ + volatile u32 ReadIndex; + + volatile u32 InterruptMask; + + /* Pad it to PAGE_SIZE so that data starts on page boundary */ + u8 Reserved[4084]; + + /* NOTE: + * The InterruptMask field is used only for channels but since our + * vmbus connection also uses this data structure and its data starts + * here, we commented out this field. + */ + /* volatile u32 InterruptMask; */ + + /* + * Ring data starts here + RingDataStartOffset + * !!! DO NOT place any fields below this !!! + */ + u8 Buffer[0]; +} __attribute__((packed)) RING_BUFFER; + +typedef struct _RING_BUFFER_INFO { + RING_BUFFER *RingBuffer; + u32 RingSize; /* Include the shared header */ + spinlock_t ring_lock; + + u32 RingDataSize; /* < ringSize */ + u32 RingDataStartOffset; + +} RING_BUFFER_INFO; + +typedef struct _RING_BUFFER_DEBUG_INFO { + u32 CurrentInterruptMask; + u32 CurrentReadIndex; + u32 CurrentWriteIndex; + u32 BytesAvailToRead; + u32 BytesAvailToWrite; +} RING_BUFFER_DEBUG_INFO; + + + +/* Interface */ + + +int RingBufferInit(RING_BUFFER_INFO *RingInfo, void *Buffer, u32 BufferLen); + +void RingBufferCleanup(RING_BUFFER_INFO *RingInfo); + +int RingBufferWrite(RING_BUFFER_INFO *RingInfo, + struct scatterlist *sglist, + u32 sgcount); + +int RingBufferPeek(RING_BUFFER_INFO *RingInfo, void *Buffer, u32 BufferLen); + +int RingBufferRead(RING_BUFFER_INFO *RingInfo, + void *Buffer, + u32 BufferLen, + u32 Offset); + +u32 GetRingBufferInterruptMask(RING_BUFFER_INFO *RingInfo); + +void DumpRingInfo(RING_BUFFER_INFO *RingInfo, char *Prefix); + +void RingBufferGetDebugInfo(RING_BUFFER_INFO *RingInfo, + RING_BUFFER_DEBUG_INFO *DebugInfo); + +#endif /* _RING_BUFFER_H_ */ |