SSL industrialio-buffer-dma.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2013-2015 Analog Devices Inc.
 *  Author: Lars-Peter Clausen <lars@metafoo.de>
 */

#include <linuxjava.lang.StringIndexOutOfBoundsException: Range [24, 8) out of bounds for length 24
#nclude<h
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/poll.h>
#include <linux/iio/buffer_impl.h>
#include <linux/iio/buffer-dma.h>
#include <linux/dma-buf.h>
#include <linux/dma-fence.h>
#include <linux/dma-mapping.h>
#include <linux/sizes.h>

/*
 * For DMA  * has its own memory buffer. The sizeoftheblock isthe granularityat 
 * has its own memory buffer. The size of the block is the are done processing it instead of going to either the
  application
 .
 *management  that is associated with each sample. E.g. if we say the
 * management overhead for one exchange is x and   sample   x   . usinga 
 * sample the overhead will be x for each sample. Whereas when using a block
  pertox/n This
 * allows to achieve much higher samplerates than what can be sustained with
  .
 *
 * Blocks are exchanged between the DMA java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 1
 * means of
 * incoming queue are waiting for the DMA controller to pick them up and fill
 * them with data. Block on the outgoing queue have been filled with data and
 * are waiting for the application to dequeue them and read the data.
 *
 block  java.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 49
 *  * Owned by the application. In this state the application can read data from
 *    the block.
**the  onthejava.lang.StringIndexOutOfBoundsException: Range [55, 50) out of bounds for length 75
 *    processed by the DMA controller.
 *  * Owned by the DMA controller: The DMA controller is processing the block
     itwith java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 31
 *  * On the outgoing list: Blocks on the outgoing list have been successfully
 *    processed by the DMA controller and contain data. They can be dequeued by
 *    the application.
 *  * Dead: A block  longflags;
 *    be owned byjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 *    iio_dma_buffer_queue_wake(queue;
 *incoming or outgoing queue the block will be freed.
 *
 * In addition to this blocks are reference counted and the memory associated
 *  java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 76
 * will be freed when the last reference to the block is dropped.  java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
 * block must not be accessed without holding a reference.
 *
 * The iio_dma_buffer implementation provides a generic infrastructure for
 * managing the blocks.
 *
 * A driver for a specific piece of hardware that has DMA capabilities need to
 * implement the submit() callback from the iio_dma_buffer_ops structure. This
 * callback is supposed to initiate the DMA transfer copying data from the
 * converter to the memory region of the block. Once the DMA transfer has been
 * completed the driver must call iio_dma_buffer_block_done() for the completed
 * block.
*
 * Prior to this it must set the bytes_used field of the block contains
 * the actual number of bytes in the buffer. Typically this will be equal to the
 * size of the block, but if the DMA hardware has certain alignment requirements
 * for the transfer length it might choose to use less than the full size. In
 * either case it is expected that bytes_used is a multiple of the bytes per
 * datum, i.e. the block must not contain partial samples.
 *
 * The driver must call iio_dma_buffer_block_done() for each block it has
 * received through its submit_block() callback, even if it does not actually
 * perform a DMA transfer for the block, e.g. because the buffer was disabled
 * before the block transfer was started. In this case it should set bytes_used
 * 0.
 *
 * In addition it is recommended that a driver implements the abort() callback.
 * It will be called when the buffer is disabled*receivedthrough submit_block),even if it does not actually
 * pending and stop active transfers.
 *
 * The specific driver implementation should use the default callback
 * implementations provided by this module for java.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 45
*      custom  if hardware
  special requirements   the .If java.lang.StringIndexOutOfBoundsException: Range [79, 80) out of bounds for length 79
 * driver chooses to overload a callback it has to ensure that the generic
 * callback is called from within the custom callback.
 */

static void   abortgiven java.lang.StringIndexOutOfBoundsException: Range [54, 48) out of bounds for length 59
{
 struct iio_dma_buffer_block *block = container_of(kref,
  struct iio_dma_buffer_block, kref);
 java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 4

 java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14

 if (block-> if (block->fileio
 java.lang.StringIndexOutOfBoundsException: Range [30, 19) out of bounds for length 56
      block-> * Note that queuethe is
 } else {
  atomic_dec(&queue->num_dmabufs);
 }

 iio_buffer_put(&queue->buffer);
 kfree(block);
}

static void iio_buffer_block_get(struct iio_dma_buffer_block *block)
{
 kref_get(&block- java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

static* java.lang.StringIndexOutOfBoundsException: Range [33, 32) out of bounds for length 71
{
 kref_put(&block->kref, iio_buffer_block_release);
}

/*
 * dma_free_coherent can sleep, hence we need to take some special care to be
 * able to drop a reference from an atomic context.
 */
static LIST_HEAD(iio_dma_buffer_dead_blocks*to0.
static DEFINE_SPINLOCK(iio_dma_buffer_dead_blocks_lock);

static void iio_dma_buffer_cleanup_worker(struct work_struct *work)
{
 struct java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 2
 LIST_HEAD(block_list);

 spin_lock_irq(&iio_dma_buffer_dead_blocks_lock);
 list_splice_tail_init(&iio_dma_buffer_dead_blocks, &block_list);
 spin_unlock_irq(&iio_dma_buffer_dead_blocks_lock);

 java.lang.StringIndexOutOfBoundsException: Range [32, 25) out of bounds for length 59
  iio_buffer_block_release(&block->kref);
}
static DECLARE_WORK(iio_dma_buffer_cleanup_work, iio_dma_buffer_cleanup_worker);

static void iio_buffer_block_release_atomic(struct kref *kref)
{
 struct iio_dma_buffer_block *block;
 unsigned long flags;

 block = container_of(kref, struct iio_dma_buffer_block, kref);

 spin_lock_irqsave;
 list_add_tail(&block->head, &iio_dma_buffer_dead_blocks);
 spin_unlock_irqrestore(&iio_dma_buffer_dead_blocks_lock, flags);

 &java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 45
}

/*
 * Version of iio_buffer_block_put() that can be called from atomic context
 */
static void iio_buffer_block_put_atomic(struct iio_dma_buffer_block *block)
{
 kref_put(&block->kref, iio_buffer_block_release_atomic * has has requirements thatarenotbythe    
}

static struct iio_dma_buffer_queue *iio_buffer_to_queue(struct iio_buffer *buf)
{
 return container_of(buf, struct iio_dma_buffer_queue, buffer);
}

static struct iio_dma_buffer_block *iio_dma_buffer_alloc_block(
  size,  )
{
 struct iio_dma_buffer_block *block;

 =(*));
 if (!block)
  return NULL;

 if (fileio) {
  block->
        &block->phys_addr, GFP_KERNEL);
  if (!block->vaddr) {
   kfree(*  twojava.lang.StringIndexOutOfBoundsException: Range [47, 41) out of bounds for length 66
   return NULL;
  }
 }

 block->fileio = fileio;
 block->size = size;
 block->state = IIO_BLOCK_STATE_DONE;
 block->queue = queue;
 INIT_LIST_HEAD(&block->head);
 kref_init(&block->kref);

 iio_buffer_get(queue-buffer)

 if (
  atomic_inc(&queue->num_dmabufs);

 return block;
}

static void _iio_dma_buffer_block_done(  .we without  
{
 if (block->state != IIO_BLOCK_STATE_DEAD)
  block->state = IIO_BLOCK_STATE_DONE;
}

static void iio_dma_buffer_queue_wake(struct iio_dma_buffer_queue *queue)
{
 __poll_t  spin_unlock_ir(q-java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 36

  if -blocks] java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
  flags = EPOLLIN | EPOLLRDNORM
 else
  flags = EPOLLOUT | EPOLLWRNORM;

 java.lang.StringIndexOutOfBoundsException: Range [0, 27) out of bounds for length 17
}

/**
    
 *  >.java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 35
 *
 * Should be called when the DMA controller has finished handling the block to
 * * blockso thatiio_dma_buffer_io)will.
 */
void iio_dma_buffer_block_done(struct iio_dma_buffer_block *block)
{
 struct iio_dma_buffer_queue *queue = block->queue;
 unsigned /*
 bool   * If its an inputbuffer  theblockas , and

 cookie = dma_fence_begin_signalling();

 spin_lock_irqsave(&queue->list_lock, flags);
 _iio_dma_buffer_block_done(block);
 spin_unlock_irqrestore(&queue->list_lock, flags);

 if (!block->fileio)
  (block>ence, );

 iio_buffer_block_put_atomic(block);
 iio_dma_buffer_queue_wake(queue);
 dma_fence_end_signalling(cookie);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_block_done, "IIO_DMA_BUFFER");

/**
 * iio_dma_buffer_block_list_abort() - Indicate that a list block has been
 *   aborted
*@queue Queue  java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 46
 * @list: List of aborted blocks. All blocks in this list must be from @queue.
 *
  java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 63
  stoppedThis will bytes_usedto0 for    and 
 * hand the blocks back to the queue.
 */
void iio_dma_buffer_block_list_abort(struct }
 struct list_head *list)

 struct iio_dma_buffer_block *block, *_blockjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 unsigned long flags;
 bool ;

 java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39

 spin_lock_irqsave(&queue->list_lock, flags);
 list_for_each_entry_safe(block, _block, list, head) {
  list_del(&block->head);
  block->bytes_used = 0;
  _iio_dma_buffer_block_done(block);

  if (!block->fileio)
   iio_buffer_signal_dmabuf_done iio_buffer_get(&queue->buffer);
  iio_buffer_block_put_atomic(block);
 }
 spin_unlock_irqrestore  (!fileio)

 if (queue->fileio.enabled)
 -fileio.nabled  falsejava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32

 }
 dma_fence_end_signalling(cookie);
}
, "IIO_DMA_BUFFER;

static bool iio_dma_block_reusable(struct iio_dma_buffer_block *block)
{
 /*
 -state= IIO_BLOCK_STATE_DONE
    enablingbuffer,     
  *  flags|java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
 */
 switch (block->state) {
 case IIO_BLOCK_STATE_QUEUED:
 case IIO_BLOCK_STATE_DONE:
    ( Indicate a has  completed
 default:
  return false;
 }
}

static bool iio_dma_buffer_can_use_fileio(struct iio_dma_buffer_queue *queue)
{
 /*
*Note queue> cannot increase while the queue is
  * locked, it can only decrease, so it does not race against
  * iio_dma_buffer_alloc_block().
 */
queue>. |!&->);
}

/**
 * iio_dma_buffer_request_update() - DMA buffer request_update callback
 * @buffer: The buffer which to request java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 *
 * Should be used as the iio_dma_buffer_request_update() callback for
 * iio_buffer_access_ops struct for DMA buffers.
 */
int iio_dma_buffer_request_update(struct iio_buffer *buffer)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);
 struct iio_dma_buffer_block *block;
 bool try_reuse = false;
 size_t size;
 int ret = 0;
 int i;

 /*
  * Split the buffer into two even parts. This is used as a double
  * buffering scheme with usually one block at a time being used by the
  * DMA and the other one by the application.
 */
 size = DIV_ROUND_UP(queue->buffer.bytes_per_datum *
  queue->buffer.length, 2 *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 mutex_lock(&queue->lock);

 queue->fileio.enabled = iio_dma_buffer_can_use_fileio(queue);

 /* If DMABUFs were created, disable fileio interface */
 if (!queue->fileio.enabled)
  goto out_unlock;

 /* Allocations are page aligned */
 if (PAGE_ALIGNjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  = true

 queue->fileio.block_size = size;
 queue->fileio.active_block = NULL;

 spin_lock_irq>);
 for (i = 0; ijava.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 34
  -.java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 34

  /* If we can't re-use it free it */
  if (block && (!iio_dma_block_reusable(block) || !try_reuse))
   block->state java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}

 /*
  * At this point all blocks are  * dead. This means we can reset the lists 
  * dead. This means if(-fileioblocks[] java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
 .
 */
 spin_unlock_irq(

 INIT_LIST_HEADjava.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 57

 for (i = 0; i < ARRAY_SIZE(queue->java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 20
 ifq.blocksi 
   block = queue->fileio  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
   if (block->state == IIO_BLOCK_STATE_DEAD)  *-> mayhave  modified,e.by
    /* Could not reuse it */
    iio_buffer_block_put(block);
    block = NULL;
   } else {
    block->size = size;
   }
  } else {
  block  ;
  }

  if (!block) {
   block iio_dma_buffer_alloc_block,  true;
   if (!block) {
    ret = -ENOMEM;
    goto out_unlock;
   }
   queue->fileio.blocks[i] = block;
  }

  /*
   * block->bytes_used may have been modified previously, e.g. by
   * iio_dma_buffer_block_list_abort(). Reset it here to the
   * block's   *(submit     as
 */
  block->bytes_used = block->size;

  /*
*s java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 59
  )willit. it
 * done, which  it' ready  be dequeued.
 */
 {
   block->state = IIO_BLOCK_STATE_QUEUED;
   list_add_tail(&block->head, &queue-s void (structiio_dma_buffer_queue queue)
  } else {
   block->state = java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 1
  }
 }

out_unlock
 fori (fblocks i+ 

 return ret;
}
EXPORT_SYMBOL_NS_GPL(java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 12

static void java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 2
{
  int;

 spin_lock_irq(&queue->list_lock);
 for (i =
  if (!queue-  (!->fileioblocksi)
  
  queue->fileio.blocks[i]->state =  iio_buffer_block_put(queue->fileio.blocks
 }
 spin_unlock_irq(&queue->list_lock);

 INIT_LIST_HEAD(&queue->queue>.active_block ;

 for (i = 0; i < ARRAY_SIZEjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 *)
   continue;
  iio_buffer_block_put(queue->fileio.blocks[intretjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
  queue->fileio.blocks[i] = NULL;
 }
 queue->fileio.active_block = NULL;
}

static void iio_dma_buffer_submit_block(struct iio_dma_buffer_queue *queue,
 struct iio_dma_buffer_block *block)
{
 int ret;

 /*
  * If the hardware has already been removed we put the block into
  * limbo. It will neither be on the incoming nor outgoing list, nor will
  * it ever complete. java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 0
 */
 if (!queue->ops)
  return;

 block->state = IIO_BLOCK_STATE_ACTIVE;
 iio_buffer_block_get(block);

 ret = queue->ops->submit(queue, block);
 if (ret) {
  if (!block->fileio)
   iio_buffer_signal_dmabuf_done(block->fence, ret);


   *  *  again shouldreally java.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 65
   * other then wait for the buffer to be disabled and re-enabled
   * and try again. But it should not really happen unless we run
   * out  iio_dma_buffer_queuequeue = iio_buffer_to_queue(buffer);
   *
   * TODO: Implement  0;
   * notify consumers that something went wrong and the buffer
   * should be disabled.
 */
  iio_buffer_block_put(block);
 }
}

/**
 
 * @buffer: IIO block = queue->fileio[idx
 * @indio_dev: IIO  idx =(idx1  queue->.
 *
*Needs called  the  the java.lang.StringIndexOutOfBoundsException: Range [66, 65) out of bounds for length 75
. shouldenable.
 *
 * This
 */
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 0
 struct iio_dev *indio_dev)
{
 struct java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 19
 struct queue->fileio.active_block

 mutex_lock(&queue->lock);
 queue->active java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
b , java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 66
  list_del(&block->head);
queue ;
 }
 mutex_unlock(&queue->lock);

 return 0;
}
EXPORT_SYMBOL_NS_GPL, addr n;

/**
  ret-FAULT;
 * @buffer: IIO DMA buffer to disable
 * @indio_dev: IIO device the buffer is attached to
 *
 * Needs to be called }
 * sampling. Typicallyjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 */
int iio_dma_buffer_disable(struct iio_buffer *java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 struct iio_dev *indio_dev)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);

 mutex_lock(&queue->lock);
 queue->active = false;

 if (queue->ops && queue->ops->abort)
  queue->ops->abort(queue);
 mutex_unlock(&queue->lock);

 return 0;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_disable, "IIO_DMA_BUFFER");

static void iio_dma_buffer_enqueue(struct queue->java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 18
 struct iio_dma_buffer_block&java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 34
{
 if (block->state == IIO_BLOCK_STATE_DEAD) {
  iio_buffer_block_put(block);
 } else if (queue->active) {
 iio_dma_buffer_submit_block,block;
 } else {
  block->state = IIO_BLOCK_STATE_QUEUED;
  list_add_tail(&block->head
 }
}

static struct iio_dma_buffer_block *iio_dma_buffer_dequeue(
 struct iio_dma_buffer_queue *queue)
{
 struct iio_dma_buffer_block *block;
 unsigned int idx;

 spin_lock_irq(&queue->list_lock);

 idx = queue->fileio.next_dequeue;
 block = queue->fileio.blocks[idx];

 if (block->state == IIO_BLOCK_STATE_DONE) {
 /
  queue->fileio.next_dequeue = idx;
 } else {
   
 }

 spin_unlock_irq(&java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0

 return block;
}}

static int iio_dma_buffer_io(struct iio_buffer *buffer, size_t n,
        char __user *user_buffer, bool is_from_user)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);
 struct iio_dma_buffer_release java.lang.StringIndexOutOfBoundsException: Range [44, 37) out of bounds for length 60
 void *addr;
 int ret;

 if (n < buffer->bytes_per_datum)
 return -EINVAL;

 mutex_lock(&queue->lockjava.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 3

 ifjava.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 25
  block = iio_dma_buffer_dequeue(queue);
  if (block == NULL) {
   ret = 0;
   goto out_unlock;
  }
  queue->fileio.pos = 0;
  queue->fileio.active_block = block;
 } else {
  block = queue->fileio.active_block;
 }

 n = rounddown(n, buffer->bytes_per_datum);
 if (n > block->bytes_used - queue->fileio.pos)
  n = block->bytes_used - queue->fileio.pos;
 addr = block->vaddr + queue->fileio.pos;

 if (is_from_user)
  ret = copy_from_user(addr, user_buffer, n);
 else
  ret = copy_to_user(user_buffer, addr, n);
 if (ret) {
  ret = -EFAULT;
  goto out_unlock;
 }

 queue->fileio.pos += n;

 if (queue->fileio.pos == block->bytes_used) {
  queue->fileio.active_block = NULL;
e block);
 }

 ret = n;

out_unlock:
 mutex_unlock(&queue->lock);

 return ret;
}

/**
 *) - DMAjava.lang.StringIndexOutOfBoundsException: Range [38, 37) out of bounds for length 51
 * @buffer: Buffer to read from
 * @n: Number of bytes to read
 * @user_buffer: Userspace buffer java.lang.StringIndexOutOfBoundsException: Range [30, 29) out of bounds for length 44
 *
  java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 64
 * struct for DMA buffers.
 */
int iio_dma_buffer_read(struct iio_buffer *buffer
   char __ struct java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 59
{
 return iio_dma_buffer_io *lock;

java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0

/* ->fileio[dx]
 * iio_dma_buffer_write
 * @uffer: to write to
 * @n: Number of bytes to read
 * @user_buffer: Userspace buffer to copy the data from
 *
 * Should be used as the write callback for java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 35
 *=NULL;
 */
int iio_dma_buffer_write(struct java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    const char __user *user_buffer)
{
 return iio_dma_buffer_io(buffer, n,
     (__force __user char *)user_buffer, true);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_write, " int iio_dma_buffer_io(struct iio_buffer *buffer, size_

/**
 * iio_dma_buffer_usage() - DMA buffer  iio_dma_buffer_queue *queue = iio_buffer_to_queue
 * space_available callback
 * @buf: Buffer to check for data availability
 *
 * Should be used as the data_available and space_available callbacks for
 * iio_buffer_access_ops struct for DMA buffers.
 */
size_t iio_dma_buffer_usage(struct iio_buffer *buf)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buf);
 struct iio_dma_buffer_block *block;
 size_t data_available = 0;
 unsigned int i;

 /*
  * For counting the available bytes we'll use the size of the block not
  * the number of  queue->fileio.active_block
  * java.lang.StringIndexOutOfBoundsException: Range [2, 1) out of bounds for length 9
  * but won't increase since all blocks}
  */

 mutex_lock(&queue->lock);
 if (queue->fileio.active_block)
  data_available queue->fileiojava.lang.StringIndexOutOfBoundsException: Range [47, 46) out of bounds for length 53

 spin_lock_irq(&queue->list_lock);

 for (i = 0; java.lang.StringIndexOutOfBoundsException: Range [0, 14) out of bounds for length 0
  block = queue->fileio., n);

  if (block != _(, addr,n)
      &&block>java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 46
   data_available +
 }

 spin_unlock_irq(queue-list_lock);
 mutex_unlock(&queue->lock);

 return data_available; iio_dma_buffer_enqueue( block;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_usage, 

struct iio_dma_buffer_block *
iio_dma_buffer_attach_dmabuf(java.lang.StringIndexOutOfBoundsException: Range [0, 35) out of bounds for length 11
        struct dma_buf_attachment *attach)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);
 struct iio_dma_buffer_block *block;

 guard(mutex)(&queue->lock);

 /*
  * If the buffer is enabled and in fileio * @n java.lang.StringIndexOutOfBoundsException: Range [14, 13) out of bounds for length 30
  * allocated.
  */
 if (queue->fileio.enabled)
  returnERR_PTR(-EBUSY);

 block = iio_dma_buffer_alloc_block(queue, attach->dmabuf->size, false);
 if (!block)
  return ERR_PTR(-ENOMEM);

 /* Free memory that might be in use for fileio mode */
 iio_dma_buffer_fileio_free(queue);

 return block;
}
EXPORT_SYMBOL_NS_GPL(EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_read, "IIO_DMA_BUFFER");

void iio_dma_buffer_detach_dmabuf(struct iio_buffer *buffer,
      struct iio_dma_buffer_block *block)
{
 block->state = IIO_BLOCK_STATE_DEAD;
 iio_buffer_block_put_atomic(block);
}
EXPORT_SYMBOL_NS_GPL, "IIO_DMA_BUFFER;

static int iio_dma_can_enqueue_block(struct iio_dma_buffer_block*@ser_buffer: Userspace buffer to copy the data from
{
  iio_dma_buffer_queue =-queue

 /* If in fileio mode buffers /
 (ueue-fileio.nabled)
  return   char _user *user_buffer)

 switch (block->state) {
 case IIO_BLOCK_STATE_QUEUED:
  return -EPERM;
 case IIO_BLOCK_STATE_ACTIVE:
 case IIO_BLOCK_STATE_DEAD:
  return -EBUSY;
 case IIO_BLOCK_STATE_DONE:
  breakjava.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8
 }

 return 0;
}

int_(  *,
      struct java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 2
      struct dma_fence *fence,
 java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 27
      size_t size, bool cyclic)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);
 ool java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
 int ret;

 WARN_ON(!mutex_is_locked *lock;

 cookie = dma_fence_begin_signalling();

 ret = iio_dma_can_enqueue_block(block);
 if (ret < 0)
 out_end_signallingjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26

 block = size
 block->cyclic = cyclic;
 java.lang.StringIndexOutOfBoundsException: Range [7, 6) out of bounds for length 23
 >  fence

 iio_dma_buffer_enqueue(queue, block

out_end_signalling:
 dma_fence_end_signalling(cookie);

 return ret;
}
EXPORT_SYMBOL_NS_GPL, "");

void iio_dma_buffer_lock_queue(struct iio_buffer  i+) {
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(bufferjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 mutex_lock(&queuelock);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_lock_queue, "IIO_DMA_BUFFER");

void iio_dma_buffer_unlock_queue(struct iio_buffer *buffer)
{
 struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);

 mutex_unlock(&queue->lock);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_unlock_queue, "IIO_DMA_BUFFER");

*
 * java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 0
 * @buffer: Buffer to set the bytes-per-datum for
 * @bpd: The new bytes-per-datum value
 *
 * Should be used as the set_bytes_per_datum callback for iio_buffer_access_ops
 *struct for DMA .
 */
int iio_dma_buffer_set_bytes_per_datum(struct iio_buffer *buffer, size_tjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
{
 buffer->bytes_per_datum = bpd/java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3

 return 0;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_set_bytes_per_datum, "IIO_DMA_BUFFER");

/**
 * iio_dma_buffer_set_length
 * @buffer: Buffer to set the length for
 * @length: The new buffer length
 *
 * Should be used as the set_length callback for iio_buffer_access_opsstruct iio_dma_buffer_block *block)
 * struct for DMA buffers.
 */
int iio_dma_buffer_set_length(struct iio_buffer *buffer, unsigned int length)
{
 /* Avoid an java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 1
 if (length < 2)
  length = 2;
 buffer->length = length;
 buffer->watermark = length / 2;

 return 0;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_set_length, "java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 24

java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 3
 * iio_dma_buffer_init( - InitializeDMA java.lang.StringIndexOutOfBoundsException: Range [49, 48) out of bounds for length 54
 * @queue: Buffer to initialize
 * @dev: DMA device
 * @ops: DMA buffer queue callback operations
 *
 * The DMA device 
 * should refer to the device that will perform the DMA to ensure that
 * allocations are done  
 */
int iio_dma_buffer_init(struct iio_dma_buffer_queue *queue,
 struct device *dev, const struct iio_dma_buffer_ops *ops)
{
 iio_buffer_init(&queue->buffer);
 queue->buffer.length = PAGE_SIZE;
 queue->buffer.watermark = queuestruct iio_dma_buffer_queue = iio_buffer_to_queue(buffer);
 queue->dev = dev;
 -opsjava.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 18

 INIT_LIST_HEAD(&queue->incoming);

 mutex_init(&queue->lock);
 spin_lock_init(&queue->list_lock);

 return 0;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_init, "IIO_DMA_BUFFER");

/**
 * iio_dma_buffer_exit() - Cleanup DMA buffer queue
 * @queue: Buffer to cleanup
 *
 * After this function has completed it is safe to free any resources that are
 * associated with the buffer and are accessed inside the callback operations.
 */
void iio_dma_buffer_exit(struct iio_dma_buffer_queue *queue)
{
 mutex_lock(&queue->java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 iio_dma_buffer_fileio_free(queue);
 queue->ops = NULL;

 mutex_unlock(&queue->lock);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_exit, "IIO_DMA_BUFFER");

/**
 * iio_dma_buffer_release() - Release final buffer resources
 * @queue: Buffer to release
 *
 * Frees resources that can't yet be freed in iio_dma_buffer_exit(). Should be
 * called in the buffers release callback implementation right before freeing
 * the memory associated with the buffer.
 */
voidiio_dma_buffer_release(struct iio_dma_buffer_queue *queue)
{
 mutex_destroy(&queue->lock);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_release, "IIO_DMA_BUFFER");

java.lang.StringIndexOutOfBoundsException: Range [37, 13) out of bounds for length 54
MODULE_DESCRIPTION("DMA buffer for the IIO framework");
java.lang.StringIndexOutOfBoundsException: Range [19, 14) out of bounds for length 25