1 files changed, 0 insertions, 625 deletions
diff --git a/drivers/staging/hv/RingBuffer.c b/drivers/staging/hv/RingBuffer.c
deleted file mode 100644
index 80b8a2c7784f..000000000000
--- a/drivers/staging/hv/RingBuffer.c
+++ /dev/null
@@ -1,625 +0,0 @@
-/*
- *
- * 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>
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include "osd.h"
-#include "logging.h"
-#include "RingBuffer.h"
-
-
-/* #defines */
-
-
-/* Amount of space to write to */
-#define BYTES_AVAIL_TO_WRITE(r, w, z) ((w) >= (r))?((z) - ((w) - (r))):((r) - (w))
-
-
-/*++
-
-Name:
-	GetRingBufferAvailBytes()
-
-Description:
-	Get number of bytes available to read and to write to
-	for the specified ring buffer
-
---*/
-static inline void
-GetRingBufferAvailBytes(RING_BUFFER_INFO *rbi, u32 *read, u32 *write)
-{
-	u32 read_loc, write_loc;
-
-	/* Capture the read/write indices before they changed */
-	read_loc = rbi->RingBuffer->ReadIndex;
-	write_loc = rbi->RingBuffer->WriteIndex;
-
-	*write = BYTES_AVAIL_TO_WRITE(read_loc, write_loc, rbi->RingDataSize);
-	*read = rbi->RingDataSize - *write;
-}
-
-/*++
-
-Name:
-	GetNextWriteLocation()
-
-Description:
-	Get the next write location for the specified ring buffer
-
---*/
-static inline u32
-GetNextWriteLocation(RING_BUFFER_INFO *RingInfo)
-{
-	u32 next = RingInfo->RingBuffer->WriteIndex;
-
-	ASSERT(next < RingInfo->RingDataSize);
-
-	return next;
-}
-
-/*++
-
-Name:
-	SetNextWriteLocation()
-
-Description:
-	Set the next write location for the specified ring buffer
-
---*/
-static inline void
-SetNextWriteLocation(RING_BUFFER_INFO *RingInfo, u32 NextWriteLocation)
-{
-	RingInfo->RingBuffer->WriteIndex = NextWriteLocation;
-}
-
-/*++
-
-Name:
-	GetNextReadLocation()
-
-Description:
-	Get the next read location for the specified ring buffer
-
---*/
-static inline u32
-GetNextReadLocation(RING_BUFFER_INFO *RingInfo)
-{
-	u32 next = RingInfo->RingBuffer->ReadIndex;
-
-	ASSERT(next < RingInfo->RingDataSize);
-
-	return next;
-}
-
-/*++
-
-Name:
-	GetNextReadLocationWithOffset()
-
-Description:
-	Get the next read location + offset for the specified ring buffer.
-	This allows the caller to skip
-
---*/
-static inline u32
-GetNextReadLocationWithOffset(RING_BUFFER_INFO *RingInfo, u32 Offset)
-{
-	u32 next = RingInfo->RingBuffer->ReadIndex;
-
-	ASSERT(next < RingInfo->RingDataSize);
-	next += Offset;
-	next %= RingInfo->RingDataSize;
-
-	return next;
-}
-
-/*++
-
-Name:
-	SetNextReadLocation()
-
-Description:
-	Set the next read location for the specified ring buffer
-
---*/
-static inline void
-SetNextReadLocation(RING_BUFFER_INFO *RingInfo, u32 NextReadLocation)
-{
-	RingInfo->RingBuffer->ReadIndex = NextReadLocation;
-}
-
-
-/*++
-
-Name:
-	GetRingBuffer()
-
-Description:
-	Get the start of the ring buffer
-
---*/
-static inline void *
-GetRingBuffer(RING_BUFFER_INFO *RingInfo)
-{
-	return (void *)RingInfo->RingBuffer->Buffer;
-}
-
-
-/*++
-
-Name:
-	GetRingBufferSize()
-
-Description:
-	Get the size of the ring buffer
-
---*/
-static inline u32
-GetRingBufferSize(RING_BUFFER_INFO *RingInfo)
-{
-	return RingInfo->RingDataSize;
-}
-
-/*++
-
-Name:
-	GetRingBufferIndices()
-
-Description:
-	Get the read and write indices as u64 of the specified ring buffer
-
---*/
-static inline u64
-GetRingBufferIndices(RING_BUFFER_INFO *RingInfo)
-{
-	return ((u64)RingInfo->RingBuffer->WriteIndex << 32)
-	|| RingInfo->RingBuffer->ReadIndex;
-}
-
-
-/*++
-
-Name:
-	DumpRingInfo()
-
-Description:
-	Dump out to console the ring buffer info
-
---*/
-void DumpRingInfo(RING_BUFFER_INFO *RingInfo, char *Prefix)
-{
-	u32 bytesAvailToWrite;
-	u32 bytesAvailToRead;
-
-	GetRingBufferAvailBytes(RingInfo,
-	&bytesAvailToRead,
-	&bytesAvailToWrite);
-
-	DPRINT(VMBUS,
-		DEBUG_RING_LVL,
-		"%s <<ringinfo %p buffer %p avail write %u "
-		"avail read %u read idx %u write idx %u>>",
-		Prefix,
-		RingInfo,
-		RingInfo->RingBuffer->Buffer,
-		bytesAvailToWrite,
-		bytesAvailToRead,
-		RingInfo->RingBuffer->ReadIndex,
-		RingInfo->RingBuffer->WriteIndex);
-}
-
-
-/* Internal routines */
-
-static u32
-CopyToRingBuffer(
-	RING_BUFFER_INFO	*RingInfo,
-	u32				StartWriteOffset,
-	void				*Src,
-	u32				SrcLen);
-
-static u32
-CopyFromRingBuffer(
-	RING_BUFFER_INFO	*RingInfo,
-	void				*Dest,
-	u32				DestLen,
-	u32				StartReadOffset);
-
-
-
-/*++
-
-Name:
-	RingBufferGetDebugInfo()
-
-Description:
-	Get various debug metrics for the specified ring buffer
-
---*/
-void RingBufferGetDebugInfo(RING_BUFFER_INFO *RingInfo,
-			    RING_BUFFER_DEBUG_INFO *DebugInfo)
-{
-	u32 bytesAvailToWrite;
-	u32 bytesAvailToRead;
-
-	if (RingInfo->RingBuffer) {
-		GetRingBufferAvailBytes(RingInfo,
-					&bytesAvailToRead,
-					&bytesAvailToWrite);
-
-		DebugInfo->BytesAvailToRead = bytesAvailToRead;
-		DebugInfo->BytesAvailToWrite = bytesAvailToWrite;
-		DebugInfo->CurrentReadIndex = RingInfo->RingBuffer->ReadIndex;
-		DebugInfo->CurrentWriteIndex = RingInfo->RingBuffer->WriteIndex;
-		DebugInfo->CurrentInterruptMask = RingInfo->RingBuffer->InterruptMask;
-	}
-}
-
-
-/*++
-
-Name:
-	GetRingBufferInterruptMask()
-
-Description:
-	Get the interrupt mask for the specified ring buffer
-
---*/
-u32 GetRingBufferInterruptMask(RING_BUFFER_INFO *rbi)
-{
-	return rbi->RingBuffer->InterruptMask;
-}
-
-/*++
-
-Name:
-	RingBufferInit()
-
-Description:
-	Initialize the ring buffer
-
---*/
-int RingBufferInit(RING_BUFFER_INFO *RingInfo, void *Buffer, u32 BufferLen)
-{
-	ASSERT(sizeof(RING_BUFFER) == PAGE_SIZE);
-
-	memset(RingInfo, 0, sizeof(RING_BUFFER_INFO));
-
-	RingInfo->RingBuffer = (RING_BUFFER *)Buffer;
-	RingInfo->RingBuffer->ReadIndex = RingInfo->RingBuffer->WriteIndex = 0;
-
-	RingInfo->RingSize = BufferLen;
-	RingInfo->RingDataSize = BufferLen - sizeof(RING_BUFFER);
-
-	spin_lock_init(&RingInfo->ring_lock);
-
-	return 0;
-}
-
-/*++
-
-Name:
-	RingBufferCleanup()
-
-Description:
-	Cleanup the ring buffer
-
---*/
-void RingBufferCleanup(RING_BUFFER_INFO *RingInfo)
-{
-}
-
-/*++
-
-Name:
-	RingBufferWrite()
-
-Description:
-	Write to the ring buffer
-
---*/
-int RingBufferWrite(RING_BUFFER_INFO *OutRingInfo,
-		    struct scatterlist *sglist, u32 sgcount)
-{
-	int i = 0;
-	u32 byteAvailToWrite;
-	u32 byteAvailToRead;
-	u32 totalBytesToWrite = 0;
-
-	struct scatterlist *sg;
-	volatile u32 nextWriteLocation;
-	u64 prevIndices = 0;
-	unsigned long flags;
-
-	DPRINT_ENTER(VMBUS);
-
-	for_each_sg(sglist, sg, sgcount, i)
-	{
-		totalBytesToWrite += sg->length;
-	}
-
-	totalBytesToWrite += sizeof(u64);
-
-	spin_lock_irqsave(&OutRingInfo->ring_lock, flags);
-
-	GetRingBufferAvailBytes(OutRingInfo,
-				&byteAvailToRead,
-				&byteAvailToWrite);
-
-	DPRINT_DBG(VMBUS, "Writing %u bytes...", totalBytesToWrite);
-
-	/* DumpRingInfo(OutRingInfo, "BEFORE "); */
-
-	/* If there is only room for the packet, assume it is full. */
-	/* Otherwise, the next time around, we think the ring buffer */
-	/* is empty since the read index == write index */
-	if (byteAvailToWrite <= totalBytesToWrite) {
-		DPRINT_DBG(VMBUS,
-			"No more space left on outbound ring buffer "
-			"(needed %u, avail %u)",
-			totalBytesToWrite,
-			byteAvailToWrite);
-
-		spin_unlock_irqrestore(&OutRingInfo->ring_lock, flags);
-
-		DPRINT_EXIT(VMBUS);
-
-		return -1;
-	}
-
-	/* Write to the ring buffer */
-	nextWriteLocation = GetNextWriteLocation(OutRingInfo);
-
-	for_each_sg(sglist, sg, sgcount, i)
-	{
-		nextWriteLocation = CopyToRingBuffer(OutRingInfo,
-						     nextWriteLocation,
-						     sg_virt(sg),
-						     sg->length);
-	}
-
-	/* Set previous packet start */
-	prevIndices = GetRingBufferIndices(OutRingInfo);
-
-	nextWriteLocation = CopyToRingBuffer(OutRingInfo,
-					     nextWriteLocation,
-					     &prevIndices,
-					     sizeof(u64));
-
-	/* Make sure we flush all writes before updating the writeIndex */
-	mb();
-
-	/* Now, update the write location */
-	SetNextWriteLocation(OutRingInfo, nextWriteLocation);
-
-	/* DumpRingInfo(OutRingInfo, "AFTER "); */
-
-	spin_unlock_irqrestore(&OutRingInfo->ring_lock, flags);
-
-	DPRINT_EXIT(VMBUS);
-
-	return 0;
-}
-
-
-/*++
-
-Name:
-	RingBufferPeek()
-
-Description:
-	Read without advancing the read index
-
---*/
-int RingBufferPeek(RING_BUFFER_INFO *InRingInfo, void *Buffer, u32 BufferLen)
-{
-	u32 bytesAvailToWrite;
-	u32 bytesAvailToRead;
-	u32 nextReadLocation = 0;
-	unsigned long flags;
-
-	spin_lock_irqsave(&InRingInfo->ring_lock, flags);
-
-	GetRingBufferAvailBytes(InRingInfo,
-				&bytesAvailToRead,
-				&bytesAvailToWrite);
-
-	/* Make sure there is something to read */
-	if (bytesAvailToRead < BufferLen) {
-		/* DPRINT_DBG(VMBUS,
-			"got callback but not enough to read "
-			"<avail to read %d read size %d>!!",
-			bytesAvailToRead,
-			BufferLen); */
-
-		spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
-
-		return -1;
-	}
-
-	/* Convert to byte offset */
-	nextReadLocation = GetNextReadLocation(InRingInfo);
-
-	nextReadLocation = CopyFromRingBuffer(InRingInfo,
-						Buffer,
-						BufferLen,
-						nextReadLocation);
-
-	spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
-
-	return 0;
-}
-
-
-/*++
-
-Name:
-	RingBufferRead()
-
-Description:
-	Read and advance the read index
-
---*/
-int RingBufferRead(RING_BUFFER_INFO *InRingInfo, void *Buffer,
-		   u32 BufferLen, u32 Offset)
-{
-	u32 bytesAvailToWrite;
-	u32 bytesAvailToRead;
-	u32 nextReadLocation = 0;
-	u64 prevIndices = 0;
-	unsigned long flags;
-
-	ASSERT(BufferLen > 0);
-
-	spin_lock_irqsave(&InRingInfo->ring_lock, flags);
-
-	GetRingBufferAvailBytes(InRingInfo,
-				&bytesAvailToRead,
-				&bytesAvailToWrite);
-
-	DPRINT_DBG(VMBUS, "Reading %u bytes...", BufferLen);
-
-	/* DumpRingInfo(InRingInfo, "BEFORE "); */
-
-	/* Make sure there is something to read */
-	if (bytesAvailToRead < BufferLen) {
-		DPRINT_DBG(VMBUS,
-			"got callback but not enough to read "
-			"<avail to read %d read size %d>!!",
-			bytesAvailToRead,
-			BufferLen);
-
-		spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
-
-		return -1;
-	}
-
-	nextReadLocation = GetNextReadLocationWithOffset(InRingInfo, Offset);
-
-	nextReadLocation = CopyFromRingBuffer(InRingInfo,
-						Buffer,
-						BufferLen,
-						nextReadLocation);
-
-	nextReadLocation = CopyFromRingBuffer(InRingInfo,
-						&prevIndices,
-						sizeof(u64),
-						nextReadLocation);
-
-	/* Make sure all reads are done before we update the read index since */
-	/* the writer may start writing to the read area once the read index */
-	/*is updated */
-	mb();
-
-	/* Update the read index */
-	SetNextReadLocation(InRingInfo, nextReadLocation);
-
-	/* DumpRingInfo(InRingInfo, "AFTER "); */
-
-	spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
-
-	return 0;
-}
-
-
-/*++
-
-Name:
-	CopyToRingBuffer()
-
-Description:
-	Helper routine to copy from source to ring buffer.
-	Assume there is enough room. Handles wrap-around in dest case only!!
-
---*/
-static u32
-CopyToRingBuffer(
-	RING_BUFFER_INFO	*RingInfo,
-	u32				StartWriteOffset,
-	void				*Src,
-	u32				SrcLen)
-{
-	void *ringBuffer = GetRingBuffer(RingInfo);
-	u32 ringBufferSize = GetRingBufferSize(RingInfo);
-	u32 fragLen;
-
-	/* wrap-around detected! */
-	if (SrcLen > ringBufferSize - StartWriteOffset) {
-		DPRINT_DBG(VMBUS, "wrap-around detected!");
-
-		fragLen = ringBufferSize - StartWriteOffset;
-		memcpy(ringBuffer + StartWriteOffset, Src, fragLen);
-		memcpy(ringBuffer, Src + fragLen, SrcLen - fragLen);
-	} else
-		memcpy(ringBuffer + StartWriteOffset, Src, SrcLen);
-
-	StartWriteOffset += SrcLen;
-	StartWriteOffset %= ringBufferSize;
-
-	return StartWriteOffset;
-}
-
-
-/*++
-
-Name:
-	CopyFromRingBuffer()
-
-Description:
-	Helper routine to copy to source from ring buffer.
-	Assume there is enough room. Handles wrap-around in src case only!!
-
---*/
-static u32
-CopyFromRingBuffer(
-	RING_BUFFER_INFO	*RingInfo,
-	void				*Dest,
-	u32				DestLen,
-	u32				StartReadOffset)
-{
-	void *ringBuffer = GetRingBuffer(RingInfo);
-	u32 ringBufferSize = GetRingBufferSize(RingInfo);
-
-	u32 fragLen;
-
-	/* wrap-around detected at the src */
-	if (DestLen > ringBufferSize - StartReadOffset) {
-		DPRINT_DBG(VMBUS, "src wrap-around detected!");
-
-		fragLen = ringBufferSize - StartReadOffset;
-
-		memcpy(Dest, ringBuffer + StartReadOffset, fragLen);
-		memcpy(Dest + fragLen, ringBuffer, DestLen - fragLen);
-	} else
-
-		memcpy(Dest, ringBuffer + StartReadOffset, DestLen);
-
-
-	StartReadOffset += DestLen;
-	StartReadOffset %= ringBufferSize;
-
-	return StartReadOffset;
-}
-
-
-/* eof */