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path: root/drivers/staging/hv/RingBuffer.c
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Diffstat (limited to 'drivers/staging/hv/RingBuffer.c')
-rw-r--r--drivers/staging/hv/RingBuffer.c153
1 files changed, 86 insertions, 67 deletions
diff --git a/drivers/staging/hv/RingBuffer.c b/drivers/staging/hv/RingBuffer.c
index f69ae33a91e3..80b8a2c7784f 100644
--- a/drivers/staging/hv/RingBuffer.c
+++ b/drivers/staging/hv/RingBuffer.c
@@ -48,7 +48,7 @@ Description:
static inline void
GetRingBufferAvailBytes(RING_BUFFER_INFO *rbi, u32 *read, u32 *write)
{
- u32 read_loc,write_loc;
+ u32 read_loc, write_loc;
/* Capture the read/write indices before they changed */
read_loc = rbi->RingBuffer->ReadIndex;
@@ -68,7 +68,7 @@ Description:
--*/
static inline u32
-GetNextWriteLocation(RING_BUFFER_INFO* RingInfo)
+GetNextWriteLocation(RING_BUFFER_INFO *RingInfo)
{
u32 next = RingInfo->RingBuffer->WriteIndex;
@@ -87,7 +87,7 @@ Description:
--*/
static inline void
-SetNextWriteLocation(RING_BUFFER_INFO* RingInfo, u32 NextWriteLocation)
+SetNextWriteLocation(RING_BUFFER_INFO *RingInfo, u32 NextWriteLocation)
{
RingInfo->RingBuffer->WriteIndex = NextWriteLocation;
}
@@ -102,7 +102,7 @@ Description:
--*/
static inline u32
-GetNextReadLocation(RING_BUFFER_INFO* RingInfo)
+GetNextReadLocation(RING_BUFFER_INFO *RingInfo)
{
u32 next = RingInfo->RingBuffer->ReadIndex;
@@ -122,7 +122,7 @@ Description:
--*/
static inline u32
-GetNextReadLocationWithOffset(RING_BUFFER_INFO* RingInfo, u32 Offset)
+GetNextReadLocationWithOffset(RING_BUFFER_INFO *RingInfo, u32 Offset)
{
u32 next = RingInfo->RingBuffer->ReadIndex;
@@ -143,7 +143,7 @@ Description:
--*/
static inline void
-SetNextReadLocation(RING_BUFFER_INFO* RingInfo, u32 NextReadLocation)
+SetNextReadLocation(RING_BUFFER_INFO *RingInfo, u32 NextReadLocation)
{
RingInfo->RingBuffer->ReadIndex = NextReadLocation;
}
@@ -159,7 +159,7 @@ Description:
--*/
static inline void *
-GetRingBuffer(RING_BUFFER_INFO* RingInfo)
+GetRingBuffer(RING_BUFFER_INFO *RingInfo)
{
return (void *)RingInfo->RingBuffer->Buffer;
}
@@ -175,7 +175,7 @@ Description:
--*/
static inline u32
-GetRingBufferSize(RING_BUFFER_INFO* RingInfo)
+GetRingBufferSize(RING_BUFFER_INFO *RingInfo)
{
return RingInfo->RingDataSize;
}
@@ -190,9 +190,10 @@ Description:
--*/
static inline u64
-GetRingBufferIndices(RING_BUFFER_INFO* RingInfo)
+GetRingBufferIndices(RING_BUFFER_INFO *RingInfo)
{
- return ((u64)RingInfo->RingBuffer->WriteIndex << 32) || RingInfo->RingBuffer->ReadIndex;
+ return ((u64)RingInfo->RingBuffer->WriteIndex << 32)
+ || RingInfo->RingBuffer->ReadIndex;
}
@@ -210,9 +211,14 @@ void DumpRingInfo(RING_BUFFER_INFO *RingInfo, char *Prefix)
u32 bytesAvailToWrite;
u32 bytesAvailToRead;
- GetRingBufferAvailBytes(RingInfo, &bytesAvailToRead, &bytesAvailToWrite);
+ 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>>",
+ 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,
@@ -229,13 +235,13 @@ static u32
CopyToRingBuffer(
RING_BUFFER_INFO *RingInfo,
u32 StartWriteOffset,
- void * Src,
+ void *Src,
u32 SrcLen);
static u32
CopyFromRingBuffer(
RING_BUFFER_INFO *RingInfo,
- void * Dest,
+ void *Dest,
u32 DestLen,
u32 StartReadOffset);
@@ -256,15 +262,15 @@ void RingBufferGetDebugInfo(RING_BUFFER_INFO *RingInfo,
u32 bytesAvailToWrite;
u32 bytesAvailToRead;
- if (RingInfo->RingBuffer)
- {
- GetRingBufferAvailBytes(RingInfo, &bytesAvailToRead, &bytesAvailToWrite);
+ 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;
}
}
@@ -299,7 +305,7 @@ int RingBufferInit(RING_BUFFER_INFO *RingInfo, void *Buffer, u32 BufferLen)
memset(RingInfo, 0, sizeof(RING_BUFFER_INFO));
- RingInfo->RingBuffer = (RING_BUFFER*)Buffer;
+ RingInfo->RingBuffer = (RING_BUFFER *)Buffer;
RingInfo->RingBuffer->ReadIndex = RingInfo->RingBuffer->WriteIndex = 0;
RingInfo->RingSize = BufferLen;
@@ -319,7 +325,7 @@ Description:
Cleanup the ring buffer
--*/
-void RingBufferCleanup(RING_BUFFER_INFO* RingInfo)
+void RingBufferCleanup(RING_BUFFER_INFO *RingInfo)
{
}
@@ -335,14 +341,14 @@ Description:
int RingBufferWrite(RING_BUFFER_INFO *OutRingInfo,
struct scatterlist *sglist, u32 sgcount)
{
- int i=0;
+ int i = 0;
u32 byteAvailToWrite;
u32 byteAvailToRead;
- u32 totalBytesToWrite=0;
+ u32 totalBytesToWrite = 0;
struct scatterlist *sg;
volatile u32 nextWriteLocation;
- u64 prevIndices=0;
+ u64 prevIndices = 0;
unsigned long flags;
DPRINT_ENTER(VMBUS);
@@ -356,17 +362,23 @@ int RingBufferWrite(RING_BUFFER_INFO *OutRingInfo,
spin_lock_irqsave(&OutRingInfo->ring_lock, flags);
- GetRingBufferAvailBytes(OutRingInfo, &byteAvailToRead, &byteAvailToWrite);
+ 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 */
+ /* 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);
+ 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);
@@ -423,17 +435,22 @@ int RingBufferPeek(RING_BUFFER_INFO *InRingInfo, void *Buffer, u32 BufferLen)
{
u32 bytesAvailToWrite;
u32 bytesAvailToRead;
- u32 nextReadLocation=0;
+ u32 nextReadLocation = 0;
unsigned long flags;
spin_lock_irqsave(&InRingInfo->ring_lock, flags);
- GetRingBufferAvailBytes(InRingInfo, &bytesAvailToRead, &bytesAvailToWrite);
+ 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); */
+ 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);
@@ -444,9 +461,9 @@ int RingBufferPeek(RING_BUFFER_INFO *InRingInfo, void *Buffer, u32 BufferLen)
nextReadLocation = GetNextReadLocation(InRingInfo);
nextReadLocation = CopyFromRingBuffer(InRingInfo,
- Buffer,
- BufferLen,
- nextReadLocation);
+ Buffer,
+ BufferLen,
+ nextReadLocation);
spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
@@ -468,24 +485,29 @@ int RingBufferRead(RING_BUFFER_INFO *InRingInfo, void *Buffer,
{
u32 bytesAvailToWrite;
u32 bytesAvailToRead;
- u32 nextReadLocation=0;
- u64 prevIndices=0;
+ u32 nextReadLocation = 0;
+ u64 prevIndices = 0;
unsigned long flags;
ASSERT(BufferLen > 0);
spin_lock_irqsave(&InRingInfo->ring_lock, flags);
- GetRingBufferAvailBytes(InRingInfo, &bytesAvailToRead, &bytesAvailToWrite);
+ 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);
+ 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);
@@ -495,17 +517,18 @@ int RingBufferRead(RING_BUFFER_INFO *InRingInfo, void *Buffer,
nextReadLocation = GetNextReadLocationWithOffset(InRingInfo, Offset);
nextReadLocation = CopyFromRingBuffer(InRingInfo,
- Buffer,
- BufferLen,
- nextReadLocation);
+ Buffer,
+ BufferLen,
+ nextReadLocation);
nextReadLocation = CopyFromRingBuffer(InRingInfo,
- &prevIndices,
- sizeof(u64),
- nextReadLocation);
+ &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 */
+ /* the writer may start writing to the read area once the read index */
+ /*is updated */
mb();
/* Update the read index */
@@ -533,25 +556,22 @@ static u32
CopyToRingBuffer(
RING_BUFFER_INFO *RingInfo,
u32 StartWriteOffset,
- void * Src,
+ void *Src,
u32 SrcLen)
{
- void * ringBuffer=GetRingBuffer(RingInfo);
- u32 ringBufferSize=GetRingBufferSize(RingInfo);
+ void *ringBuffer = GetRingBuffer(RingInfo);
+ u32 ringBufferSize = GetRingBufferSize(RingInfo);
u32 fragLen;
- if (SrcLen > ringBufferSize - StartWriteOffset) /* wrap-around detected! */
- {
+ /* 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
- {
+ } else
memcpy(ringBuffer + StartWriteOffset, Src, SrcLen);
- }
StartWriteOffset += SrcLen;
StartWriteOffset %= ringBufferSize;
@@ -573,28 +593,27 @@ Description:
static u32
CopyFromRingBuffer(
RING_BUFFER_INFO *RingInfo,
- void * Dest,
+ void *Dest,
u32 DestLen,
u32 StartReadOffset)
{
- void * ringBuffer=GetRingBuffer(RingInfo);
- u32 ringBufferSize=GetRingBufferSize(RingInfo);
+ void *ringBuffer = GetRingBuffer(RingInfo);
+ u32 ringBufferSize = GetRingBufferSize(RingInfo);
u32 fragLen;
- if (DestLen > ringBufferSize - StartReadOffset) /* wrap-around detected at the src */
- {
+ /* 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
- {
+ } else
+
memcpy(Dest, ringBuffer + StartReadOffset, DestLen);
- }
+
StartReadOffset += DestLen;
StartReadOffset %= ringBufferSize;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.