1 files changed, 0 insertions, 527 deletions
diff --git a/drivers/staging/hv/ring_buffer.c b/drivers/staging/hv/ring_buffer.c
deleted file mode 100644
index 70e2e66..0000000
--- a/drivers/staging/hv/ring_buffer.c
+++ /dev/null
@@ -1,527 +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>
- *   K. Y. Srinivasan <kys@microsoft.com>
- *
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/mm.h>
-
-#include "hyperv.h"
-#include "hyperv_vmbus.h"
-
-
-/* #defines */
-
-
-/* Amount of space to write to */
-#define BYTES_AVAIL_TO_WRITE(r, w, z) \
-	((w) >= (r)) ? ((z) - ((w) - (r))) : ((r) - (w))
-
-
-/*
- *
- * hv_get_ringbuffer_availbytes()
- *
- * Get number of bytes available to read and to write to
- * for the specified ring buffer
- */
-static inline void
-hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
-			  u32 *read, u32 *write)
-{
-	u32 read_loc, write_loc;
-
-	smp_read_barrier_depends();
-
-	/* Capture the read/write indices before they changed */
-	read_loc = rbi->ring_buffer->read_index;
-	write_loc = rbi->ring_buffer->write_index;
-
-	*write = BYTES_AVAIL_TO_WRITE(read_loc, write_loc, rbi->ring_datasize);
-	*read = rbi->ring_datasize - *write;
-}
-
-/*
- * hv_get_next_write_location()
- *
- * Get the next write location for the specified ring buffer
- *
- */
-static inline u32
-hv_get_next_write_location(struct hv_ring_buffer_info *ring_info)
-{
-	u32 next = ring_info->ring_buffer->write_index;
-
-	return next;
-}
-
-/*
- * hv_set_next_write_location()
- *
- * Set the next write location for the specified ring buffer
- *
- */
-static inline void
-hv_set_next_write_location(struct hv_ring_buffer_info *ring_info,
-		     u32 next_write_location)
-{
-	ring_info->ring_buffer->write_index = next_write_location;
-}
-
-/*
- * hv_get_next_read_location()
- *
- * Get the next read location for the specified ring buffer
- */
-static inline u32
-hv_get_next_read_location(struct hv_ring_buffer_info *ring_info)
-{
-	u32 next = ring_info->ring_buffer->read_index;
-
-	return next;
-}
-
-/*
- * hv_get_next_readlocation_withoffset()
- *
- * Get the next read location + offset for the specified ring buffer.
- * This allows the caller to skip
- */
-static inline u32
-hv_get_next_readlocation_withoffset(struct hv_ring_buffer_info *ring_info,
-				 u32 offset)
-{
-	u32 next = ring_info->ring_buffer->read_index;
-
-	next += offset;
-	next %= ring_info->ring_datasize;
-
-	return next;
-}
-
-/*
- *
- * hv_set_next_read_location()
- *
- * Set the next read location for the specified ring buffer
- *
- */
-static inline void
-hv_set_next_read_location(struct hv_ring_buffer_info *ring_info,
-		    u32 next_read_location)
-{
-	ring_info->ring_buffer->read_index = next_read_location;
-}
-
-
-/*
- *
- * hv_get_ring_buffer()
- *
- * Get the start of the ring buffer
- */
-static inline void *
-hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
-{
-	return (void *)ring_info->ring_buffer->buffer;
-}
-
-
-/*
- *
- * hv_get_ring_buffersize()
- *
- * Get the size of the ring buffer
- */
-static inline u32
-hv_get_ring_buffersize(struct hv_ring_buffer_info *ring_info)
-{
-	return ring_info->ring_datasize;
-}
-
-/*
- *
- * hv_get_ring_bufferindices()
- *
- * Get the read and write indices as u64 of the specified ring buffer
- *
- */
-static inline u64
-hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info)
-{
-	return (u64)ring_info->ring_buffer->write_index << 32;
-}
-
-
-/*
- *
- * hv_dump_ring_info()
- *
- * Dump out to console the ring buffer info
- *
- */
-void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix)
-{
-	u32 bytes_avail_towrite;
-	u32 bytes_avail_toread;
-
-	hv_get_ringbuffer_availbytes(ring_info,
-	&bytes_avail_toread,
-	&bytes_avail_towrite);
-
-	DPRINT(VMBUS,
-		DEBUG_RING_LVL,
-		"%s <<ringinfo %p buffer %p avail write %u "
-		"avail read %u read idx %u write idx %u>>",
-		prefix,
-		ring_info,
-		ring_info->ring_buffer->buffer,
-		bytes_avail_towrite,
-		bytes_avail_toread,
-		ring_info->ring_buffer->read_index,
-		ring_info->ring_buffer->write_index);
-}
-
-
-/*
- *
- * hv_copyfrom_ringbuffer()
- *
- * Helper routine to copy to source from ring buffer.
- * Assume there is enough room. Handles wrap-around in src case only!!
- *
- */
-static u32 hv_copyfrom_ringbuffer(
-	struct hv_ring_buffer_info	*ring_info,
-	void				*dest,
-	u32				destlen,
-	u32				start_read_offset)
-{
-	void *ring_buffer = hv_get_ring_buffer(ring_info);
-	u32 ring_buffer_size = hv_get_ring_buffersize(ring_info);
-
-	u32 frag_len;
-
-	/* wrap-around detected at the src */
-	if (destlen > ring_buffer_size - start_read_offset) {
-		frag_len = ring_buffer_size - start_read_offset;
-
-		memcpy(dest, ring_buffer + start_read_offset, frag_len);
-		memcpy(dest + frag_len, ring_buffer, destlen - frag_len);
-	} else
-
-		memcpy(dest, ring_buffer + start_read_offset, destlen);
-
-
-	start_read_offset += destlen;
-	start_read_offset %= ring_buffer_size;
-
-	return start_read_offset;
-}
-
-
-/*
- *
- * hv_copyto_ringbuffer()
- *
- * Helper routine to copy from source to ring buffer.
- * Assume there is enough room. Handles wrap-around in dest case only!!
- *
- */
-static u32 hv_copyto_ringbuffer(
-	struct hv_ring_buffer_info	*ring_info,
-	u32				start_write_offset,
-	void				*src,
-	u32				srclen)
-{
-	void *ring_buffer = hv_get_ring_buffer(ring_info);
-	u32 ring_buffer_size = hv_get_ring_buffersize(ring_info);
-	u32 frag_len;
-
-	/* wrap-around detected! */
-	if (srclen > ring_buffer_size - start_write_offset) {
-		frag_len = ring_buffer_size - start_write_offset;
-		memcpy(ring_buffer + start_write_offset, src, frag_len);
-		memcpy(ring_buffer, src + frag_len, srclen - frag_len);
-	} else
-		memcpy(ring_buffer + start_write_offset, src, srclen);
-
-	start_write_offset += srclen;
-	start_write_offset %= ring_buffer_size;
-
-	return start_write_offset;
-}
-
-/*
- *
- * hv_ringbuffer_get_debuginfo()
- *
- * Get various debug metrics for the specified ring buffer
- *
- */
-void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
-			    struct hv_ring_buffer_debug_info *debug_info)
-{
-	u32 bytes_avail_towrite;
-	u32 bytes_avail_toread;
-
-	if (ring_info->ring_buffer) {
-		hv_get_ringbuffer_availbytes(ring_info,
-					&bytes_avail_toread,
-					&bytes_avail_towrite);
-
-		debug_info->bytes_avail_toread = bytes_avail_toread;
-		debug_info->bytes_avail_towrite = bytes_avail_towrite;
-		debug_info->current_read_index =
-			ring_info->ring_buffer->read_index;
-		debug_info->current_write_index =
-			ring_info->ring_buffer->write_index;
-		debug_info->current_interrupt_mask =
-			ring_info->ring_buffer->interrupt_mask;
-	}
-}
-
-
-/*
- *
- * hv_get_ringbuffer_interrupt_mask()
- *
- * Get the interrupt mask for the specified ring buffer
- *
- */
-u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *rbi)
-{
-	return rbi->ring_buffer->interrupt_mask;
-}
-
-/*
- *
- * hv_ringbuffer_init()
- *
- *Initialize the ring buffer
- *
- */
-int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
-		   void *buffer, u32 buflen)
-{
-	if (sizeof(struct hv_ring_buffer) != PAGE_SIZE)
-		return -EINVAL;
-
-	memset(ring_info, 0, sizeof(struct hv_ring_buffer_info));
-
-	ring_info->ring_buffer = (struct hv_ring_buffer *)buffer;
-	ring_info->ring_buffer->read_index =
-		ring_info->ring_buffer->write_index = 0;
-
-	ring_info->ring_size = buflen;
-	ring_info->ring_datasize = buflen - sizeof(struct hv_ring_buffer);
-
-	spin_lock_init(&ring_info->ring_lock);
-
-	return 0;
-}
-
-/*
- *
- * hv_ringbuffer_cleanup()
- *
- * Cleanup the ring buffer
- *
- */
-void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info)
-{
-}
-
-/*
- *
- * hv_ringbuffer_write()
- *
- * Write to the ring buffer
- *
- */
-int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
-		    struct scatterlist *sglist, u32 sgcount)
-{
-	int i = 0;
-	u32 bytes_avail_towrite;
-	u32 bytes_avail_toread;
-	u32 totalbytes_towrite = 0;
-
-	struct scatterlist *sg;
-	u32 next_write_location;
-	u64 prev_indices = 0;
-	unsigned long flags;
-
-	for_each_sg(sglist, sg, sgcount, i)
-	{
-		totalbytes_towrite += sg->length;
-	}
-
-	totalbytes_towrite += sizeof(u64);
-
-	spin_lock_irqsave(&outring_info->ring_lock, flags);
-
-	hv_get_ringbuffer_availbytes(outring_info,
-				&bytes_avail_toread,
-				&bytes_avail_towrite);
-
-
-	/* 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 (bytes_avail_towrite <= totalbytes_towrite) {
-		spin_unlock_irqrestore(&outring_info->ring_lock, flags);
-		return -EAGAIN;
-	}
-
-	/* Write to the ring buffer */
-	next_write_location = hv_get_next_write_location(outring_info);
-
-	for_each_sg(sglist, sg, sgcount, i)
-	{
-		next_write_location = hv_copyto_ringbuffer(outring_info,
-						     next_write_location,
-						     sg_virt(sg),
-						     sg->length);
-	}
-
-	/* Set previous packet start */
-	prev_indices = hv_get_ring_bufferindices(outring_info);
-
-	next_write_location = hv_copyto_ringbuffer(outring_info,
-					     next_write_location,
-					     &prev_indices,
-					     sizeof(u64));
-
-	/* Make sure we flush all writes before updating the writeIndex */
-	smp_wmb();
-
-	/* Now, update the write location */
-	hv_set_next_write_location(outring_info, next_write_location);
-
-
-	spin_unlock_irqrestore(&outring_info->ring_lock, flags);
-	return 0;
-}
-
-
-/*
- *
- * hv_ringbuffer_peek()
- *
- * Read without advancing the read index
- *
- */
-int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
-		   void *Buffer, u32 buflen)
-{
-	u32 bytes_avail_towrite;
-	u32 bytes_avail_toread;
-	u32 next_read_location = 0;
-	unsigned long flags;
-
-	spin_lock_irqsave(&Inring_info->ring_lock, flags);
-
-	hv_get_ringbuffer_availbytes(Inring_info,
-				&bytes_avail_toread,
-				&bytes_avail_towrite);
-
-	/* Make sure there is something to read */
-	if (bytes_avail_toread < buflen) {
-
-		spin_unlock_irqrestore(&Inring_info->ring_lock, flags);
-
-		return -EAGAIN;
-	}
-
-	/* Convert to byte offset */
-	next_read_location = hv_get_next_read_location(Inring_info);
-
-	next_read_location = hv_copyfrom_ringbuffer(Inring_info,
-						Buffer,
-						buflen,
-						next_read_location);
-
-	spin_unlock_irqrestore(&Inring_info->ring_lock, flags);
-
-	return 0;
-}
-
-
-/*
- *
- * hv_ringbuffer_read()
- *
- * Read and advance the read index
- *
- */
-int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
-		   u32 buflen, u32 offset)
-{
-	u32 bytes_avail_towrite;
-	u32 bytes_avail_toread;
-	u32 next_read_location = 0;
-	u64 prev_indices = 0;
-	unsigned long flags;
-
-	if (buflen <= 0)
-		return -EINVAL;
-
-	spin_lock_irqsave(&inring_info->ring_lock, flags);
-
-	hv_get_ringbuffer_availbytes(inring_info,
-				&bytes_avail_toread,
-				&bytes_avail_towrite);
-
-	/* Make sure there is something to read */
-	if (bytes_avail_toread < buflen) {
-		spin_unlock_irqrestore(&inring_info->ring_lock, flags);
-
-		return -EAGAIN;
-	}
-
-	next_read_location =
-		hv_get_next_readlocation_withoffset(inring_info, offset);
-
-	next_read_location = hv_copyfrom_ringbuffer(inring_info,
-						buffer,
-						buflen,
-						next_read_location);
-
-	next_read_location = hv_copyfrom_ringbuffer(inring_info,
-						&prev_indices,
-						sizeof(u64),
-						next_read_location);
-
-	/* 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 */
-	smp_mb();
-
-	/* Update the read index */
-	hv_set_next_read_location(inring_info, next_read_location);
-
-	spin_unlock_irqrestore(&inring_info->ring_lock, flags);
-
-	return 0;
-}