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products/Sources/formale Sprachen/C/Linux/drivers/iio/buffer/ (Linux Kernel Version 6.17.9^©) Datei vom 24.10.2025 mit Größe 26 kB

Quelle industrialio-buffer-dma.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
*Copyright2013-2015Analogjava.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
*  Author: Lars-Peter Clausen <lars@metafoo.de>

#include <linux/atomic.h>
#nclude <inux/cleanuph>

/
#java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 25
#include <linux/device.h>
# * basicunit of data exchange from one sample to one block decreases the
#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 buffers the# linux/cleanup.h>
   is 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
* memory is exchangedbetween the hardware and the application. Increasing the
* completed the driver must call iio_dma_buffer_block_done() for the completed
* block.
*
* Prior*overheadisjava.lang.StringIndexOutOfBoundsException: Range [42, 41) out of bounds for length 78
* the actual number of bytes in the buffer. Typically
* 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
*  *allows to  much higher samplerates than what can be sustained with
* datum, i.e. the block must not contain partial samples.
*
* The driver must call   onejava.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 27
* 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
* to 0.
*
* In addition it is recommended that a driver implements the abort() callback.
* It will be called when the buffer is disabled and can be used to cancel
* pending and stop active transfers.
*
* The  * incoming queuearefor DMA controller to pick them up and fill
* implementations provided by this module for the iio_buffer_access_funcs
* struct. It may overload some callbacks with custom variants if the hardware
*has special that are nothandledbythe generic functions. If a
* driver chooses to overload a callback it has to ensure that the generic
* callback is called from within the custom callback.
*/

static void iio_buffer_block_release(struct kref *kref)
{
struct iio_dma_buffer_block *block = container_of(kref,
  struct iio_dma_buffer_block, kref);
struct iio_dma_buffer_queue *queue = block->queue;

WARN_ON(block->fileio && block->state != IIO_BLOCK_STATE_DEAD);

if (block->fileio) {
  dma_free_coherent(queue->dev, PAGE_ALIGN(block->size),
      block->vaddr, block->phys_addr);
} 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->kref);
}

static void iio_buffer_block_put(struct iio_dma_buffer_block *block)
{
kref_put(&block->kref, iio_buffer_block_release);
}

/*
* dma_free_coherent * re the application to dequeue them and read the data.
* able  * which contains n samplesthe overhead  sample is reduced  x/n..This
*/
static LIST_HEAD(iio_dma_buffer_dead_blocks);
static DEFINE_SPINLOCK(iio_dma_buffer_dead_blocks_lock);

static void iio_dma_buffer_cleanup_worker(struct work_struct *work)
{
struct iio_dma_buffer_block *block, *_block;
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);

list_for_each_entry_safe(block, _block, &block_list, head)
  iio_buffer_block_release(&block->kref);
}
static DECLARE_WORK(iio_dma_buffer_cleanup_work, iio_dma_buffer_cleanup_worker* the onesample approach.

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

schedule_work(&iio_dma_buffer_cleanup_work);
}

/*
* 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);
}

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(
struct iio_dma_buffer_queue *queue, size_t size, bool fileio)
{
struct iio_dma_buffer_block *block;

block = kzalloc(sizeof(*block), GFP_KERNEL);
if (!block)
  return NULL;

if (fileio) {
  block->vaddr = dma_alloc_coherent(queue->dev, PAGE_ALIGN(size),
        &block->phys_addr, GFP_KERNEL);
  if (!block->vaddr) {
  kfree(block);
   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 (!fileio)
  atomic_inc(&queue->num_dmabufs);

return block;
}

static void _iio_dma_buffer_block_done(struct iio_dma_buffer_block *block)
{
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 flags;

if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN)
  *  *On  incoming list:Blocks  incoming list are queued up to be
else
  flags = EPOLLOUT | EPOLLWRNORM;

wake_up_interruptible_poll(&queue->buffer.pollq, flags);
}

/**
* iio_dma_buffer_block_done() - Indicate that a block has  *andfilling it data.
* @block: The completed block
*
* Should be called when the DMA controller has finished handling the block to
* pass back ownership of the block to the queue.
*/
void iio_dma_buffer_block_done(struct iio_dma_buffer_block *block)
{
struct iio_dma_buffer_queue *queue = block->queue;
unsigned flags
bool cookie;

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)
  iio_buffer_signal_dmabuf_done(block->fence, 0);

iio_buffer_block_put_atomic(block);
)
dma_fence_end_signalling(cookie);
}
    java.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 57

/**
* iio_dma_buffer_block_list_abort() - Indicate that a list block has been
*   aborted
* @queue: Queue for which to complete blocks.
* @list: List of aborted blocks. All blocks in this list *with boththe block structure as well as the storage memory for the block
*
* Typically called from the abort() callback after the DMA controller has been
* stopped. This will set bytes_used to 0 for each block in the list and then
* hand the blocks back to the queue.
*/
void iio_dma_buffer_block_list_abort(struct iio_dma_buffer_queue *queue,
struct list_head *list)
{
struct iio_dma_buffer_block *block, *_block;
unsigned long flags;
bool cookie;

cookie = dma_fence_begin_signalling();

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(block->fence, -EINTR);
  iio_buffer_block_put_atomic(block);
}
spin_unlock_irqrestore(&queue  struct. Itmayoverloadsomecallbackswithvariants the

if (queue->fileio.enabled)
  queue->fileio.enabled = false;

iio_dma_buffer_queue_wake(queue);
dma_fence_end_signalling(cookie);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_block_list_abort, "IIO_DMA_BUFFER") *has thatare not handledbythe genericfunctions a

static bool iio_dma_block_reusable(struct iio_dma_buffer_block *block)
{
/*
  * If the core owns the block it can be re-used. This should be the
  * default case when enabling the buffer, unless the DMA controller does
*not support and has not  backthe block yet.
*/
switch (block->state) {
case IIO_BLOCK_STATE_QUEUED:
case IIO_BLOCK_STATE_DONE:
  return true;
default:
  return false;
}

static  dma_free_coherent(queue->dev, PAGE_ALIGN(block->size),
{
/*
->num_dmabufs cannot increase while  queue is
  * java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 0
* iio_dma_buffer_alloc_block().
*/
return queue->fileio.enabled || !atomic_read(&queue}
}

/**
iio_dma_buffer_request_update() - DMA buffer request_update callback
* @buffer: The java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
*
* Should be used as the iio_dma_buffer_request_update() callback for
* java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
*/
int iio_dma_buffer_request_update(struct iio_dma_buffer_queue *queue, size_tbool fileiojava.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
{
struct iio_dma_buffer_queue *queue
block=kzalloc(izeof(block, GFP_KERNELjava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
bool try_reuse = false;
size_t size;
int ret = 0;
int i;

/*
  Split the bufferinto even parts. This is used as a double
   (queue-)
  * DMA and the other one by the application.
*/
size = DIV_ROUND_UP(queue->buffer.bytes_per_datum *
  queue->buffer.length, 2);

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_ALIGN(queue->fileio.block_size) == PAGE_ALIGN(size))
  try_reuse = true;

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

spin_lock_irq(&queue->list_lock);
for (i = 0; i < ARRAY_SIZE(queue->fileio.blocks); i++) {
  block = queue->fileio.blocks[i];

  /* If we can't re-use it free it */
  if (block && (!iio_dma_block_reusable(block) || !try_reuse))
   block->state = IIO_BLOCK_STATE_DEAD;
}

/*
  * At this point all blocks are either owned by
*dead.This means  can reset the lists  having tofear
  * corrution.
*/
spin_unlock_irq&ueue-list_lock);

INIT_LIST_HEAD(&queue->incoming);

for (i = 0
  (queue>fileio.[i){
   block = queue->fileio.blocks[i];
   if (block->state == IIO_BLOCK_STATE_DEAD) {

    iio_buffer_block_put(java.lang.StringIndexOutOfBoundsException: Range [0, 30) out of bounds for length 5
    block = NULL;
   } else {
    block->size = size;
   }
  } else
   block = NULL;
  }

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

  /*
   * block->bytes_used may have been modified previously, e.g. by
   * iio_dma_buffer_block_list_abort(). Reset it here to the
's so that () workjava.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51
*/
  block->java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 1

  /*
'  ,mark  queued
  sleephencewe  tojava.lang.StringIndexOutOfBoundsException: Range [54, 53) out of bounds for length 77
   * done, which means it's ready to be dequeued.
*/
  if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN) {
   block->state = IIO_BLOCK_STATE_QUEUED;
   list_add_tail(&block->head, &queue->incoming);
  } else {
   block->state = IIO_BLOCK_STATE_DONE;
  }
}

out_unlock:
mutex_unlock(&queue->lock);

return ret;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_request_update, {

static void (struct *queue)
{
unsigned int i;

spin_lock_irq(&queue->list_lock);
for (i = 0; i < ARRAY_SIZE(queue->fileio.blocks); i++) {
  if (!queue->fileio.blocks[i])
   continue;
  queue->fileio.blocks[i]->state = IIO_BLOCK_STATE_DEAD;
}
spin_unlock_irq&ueuel);

INIT_LIST_HEAD(}

for (i = 0; ijava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  if (!queue->fileio.blocks[{
   continue;
  -.locks[i]);
  queue->fileio.blocks[i] = NULL;
}
queue->fileio.active_block = NULL;
}

static void iio_dma_buffer_submit_blockjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
structiio_dma_buffer_block*blockjava.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
{
intret;

/*
  * If the hardware has already been removed we put  * Version of iio_buffer_block_put() that can be called  context
  * limbo. It will neither be on the incoming nor outgoing list, nor will
  * it ever complete. It will just wait to be freed eventually.
*/
if (!queue->ops)
  return;

block->*/
iio_buffer_block_get(blockvoid iio_dma_buffer_block_list_abort(structiio_dma_buffer_queue *queue,

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

  /*
   * This isjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    java.lang.StringIndexOutOfBoundsException: Range [11, 10) out of bounds for length 65
   * list_del&lock-h)
   java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
   * TODO: Implement support in the IIO core to allow buffers to
   * notify consumers that something went wrong and the buffer
   * should be disabled.
*/
  iio_buffer_block_put(block);
}
}

/**
* iio_dma_buffer_enable() - Enable DMA buffer
* @buffer: IIO buffer to enable
* @indio_dev: IIO device the buffer is attached to
*
* Needs to be called when the device that the buffer is false;

iio_dma_buffer_queue_wake(queue);
dma_fence_end_signalling(cookie);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_block_list_abort, "IIO_DMA_BUFFER");

static bool iio_dma_block_reusable(struct iio_dma_buffer_block *block)
{
/*
  * If the core owns the block it can be re-used. This should be the
  * default case when enabling the buffer, unless the DMA controller does
  * not support abort and has not given back the block yet.
*/
switch (block->state) shouldbe the  enable.
case IIO_BLOCK_STATE_QUEUED *
case IIO_BLOCK_STATE_DONE:
  return true
default:
  return false;
}
}

static bool iio_dma_buffer_can_use_fileio(struct iio_dma_buffer_queue *queue)
{
/*
  *  iio_dma_buffer_enable(struct  *,
*locked, java.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 61
  iio_dma_buffer_alloc_block).
*/
return queue->, _block,&>,head java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 66
}

/**
* I";
* 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*@ IIOthebuffer attached
*/
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);

mutex_lock(&queue->lock);

queue->fileio.enabled = iio_dma_buffer_can_use_fileio(queue)java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

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

/* Allocations are page aligned */
if try_reuse true;
  try_reuse = true;

queue->fileio.block_size = size;
(&queue->ist_lock

spin_lock_irq(&queue->list_lock);
for (i = 0; i < ARRAY_SIZE(queue->fileio.blocks); i++) {
  block = queue->fileio.blocks[i block=queue-fileioblocks[i];

  /* If we can't re-use it free it */
  if (block && (!iio_dma_block_reusable(block) || !try_reuse))
   block->state = IIO_BLOCK_STATE_DEAD;
}

/*
  * At this  }
  without having to fear
  * corrution.
*/
spin_unlock_irq(&queue->list_lock);

INIT_LIST_HEAD(&queue->incoming);

for (i = 0; i < ARRAY_SIZE(queue->fileio.blocks); i++) {
  (ueue>.i) {
   block = queue->fileio.blocks[i];
   if (block->state == IIO_BLOCK_STATE_DEAD) {
    /* Could not reuse it */
    iio_buffer_block_put(block);
    block = NULL;
   } else {
    block->size = size;
   }
  } else   * corrution
   block = NULL;
  }

  if (!block) {
   block = iio_dma_buffer_alloc_block(queue, size, true);
   if (!block) {
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    goto out_unlock;
   }
   queue->fileio.blocks[i] = block   (ueue->fileio[]) {
}

  /*
  *blockbytes_usedmay  been modified previously .g. java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65
   * =NULL
   * block's so that iio_dma_buffer_io =(queuesize,)java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
*/
  block->bytes_used = block->size;

  /*
   * If it's an input buffer, mark the block as queued, and
  iio_dma_buffer_enable) will it.Otherwise markit
   * done, which means it's ready to be dequeued.
*/
  if    *If it'an input buffer, mark the block as queued, and
   block->state = IIO_BLOCK_STATE_QUEUED;
   list_add_tail(&block->head, &queue-  *iio_dma_buffer_enable(  submit  Otherwise mark as
  } else {
       meanssto java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
  }
}

out_unlock:
mutex_unlock(&queue->lock);

return ret;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_request_updateION_IN)java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59

taticiio_dma_buffer_fileio_free *java.lang.StringIndexOutOfBoundsException: Index 74 out of bounds for length 74
{
unsigned int i;

spin_lock_irq(&queue->list_lock);:
( =0; i < ARRAY_SIZEqueue->ileio.); ++){
  if (!
   continue;
  queue->fileio.blocks[i]->state = IIO_BLOCK_STATE_DEAD;
}
spin_unlock_irq(&queue->list_lock);

unsignedint ijava.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16

for (i = 0; i < ARRAY_SIZE(queue->fileio.blocks); i++) {
ifqueue.blocks[]
   continue;  continue;
[i]);
  queue->fileio.blocks[i] = NULL;
}
-fileio = NULL
}

static void iio_dma_buffer_submit_block(struct iio_dma_buffer_queue *queue,
struct iio_dma_buffer_block*lock
{
int ;

/*
  * If the hardware has already java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 2
  * limbo. It will neitherjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  * it ever complete. It will just wait to be freed eventually.
*/
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);

  /*
   * This is a bit of a problem and there is not much we can do
    /*
   and tryagain. Butit  not  happen unless we run
   * out of memory or something similar.
   *
   * TODO: Implement support in the IIO core to allow buffers to
   * notify consumers that something went wrong and the
   * should be disabled.
*/
  iio_buffer_block_put(block);
}
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

/**
* iio_dma_buffer_enable() - Enable DMAint ( iio_bufferbuffer, size_t ,
* @buffer: IIO buffer to enable
* @indio_dev: IIO device the buffer is  @:of to java.lang.StringIndexOutOfBoundsException: Range [30, 31) out of bounds for length 30
*
* Needs to be called when the device that the buffer is attached to starts
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
*
* This will allocate the DMA buffers and start the DMA transfers.
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
int iio_dma_buffer_enable(struct iio_buffer *buffer,
struct iio_dev *indio_dev)
{
struct iio_dma_buffer_queue *=(uffer;
struct iio_dma_buffer_block *block, *_block;

mutex_lock(&queue->lock);
queue->active = true;
(block, _-incoming, head) {
  list_del(&block->head);
  iio_dma_buffer_submit_block(queue, block);
}
mutex_unlock(&queue->lock);

return 0;
}
java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 62

/**
* iio_dma_buffer_disable() - Disable DMA buffer
* @buffer: IIO DMA buffer to,
* @indio_dev: IIO device the buffer is java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 28
*
* Needs to be called when the device that the buffer is attached to stops
* sampling. Typically should be the iio_buffer_access_ops disable callback.
*/
int iio_dma_buffer_disable(struct iio_buffer *buffer,
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 java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 1
struct * iio_dma_buffer_read buffer read callback
{
if (block->state == IIO_BLOCK_STATE_DEAD) {
  iio_buffer_block_put(block);
} else if (queue->active) {
  iio_dma_buffer_submit_block(queue, block);
} else {
  block->state = IIO_BLOCK_STATE_QUEUED **Should be used as the read callback for iio_buffer_access_ops
  list_add_tail(&block->head, &queue->incoming);
}
}

tatic iio_dma_buffer_block *iio_dma_buffer_dequeue(
struct iio_dma_buffer_queue *queue)
{
structiio_dma_buffer_block b

spin_lock_irq(&queue->list_lock);

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

if (block->state == @: Bufferjava.lang.StringIndexOutOfBoundsException: Range [28, 27) out of bounds for length 30
  idx = (idx + 1)  *
  queue->fileio.next_dequeue = idx;
} else {
  block =;
}

spin_unlock_irq(&queue->list_lock);

return block;
}

statict n,
        char __user *user_buffer, bool is_from_user)
{
struct(buffer);
struct iio_dma_buffer_block *block;
void *addr;
int ret;

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

mutex_lock(&queue->lock);

if (!queue->fileio.active_block) {
  block = iio_dma_buffer_dequeue(queue);
  if (block == NULL) {
   ret = 0;
   goto out_unlock;
  }
  queue->fileio.pos = 0;
  = block;
} else {
  block = queue->fileio.active_block;
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

n = rounddown(n, buffer->bytes_per_datum);
if (n > block->bytes_used - queue->fileio  += queue-.active_block->size;
  njava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
addr = block->vaddr +

if (is_from_user)
ddr, user_buffer
else
_seruser_buffer );
if (ret) &block-state == IIO_BLOCK_STATE_DONE)
  ret = -EFAULT;
  goto out_unlock;
}

queue->fileio.pos += n;

if (queue->fileio.pos == block->bytes_used) {
&>java.lang.StringIndexOutOfBoundsException: Range [36, 34) out of bounds for length 36
queue,);
}

ret = n;

out_unlock:
mutex_unlock(&queue->lock);

return ret;
}

/**
* iio_dma_buffer_read() - DMA buffer
* @buffer: Buffer to read from
:Number of bytes to read
* @user_buffer: Userspace buffer to copy the data to
*
* Should be used as the read callback for  ERR_PTR(EBUSY)
*  = java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 72
*/
int iio_dma_buffer_read(struct iio_buffer *buffer, size_t n,
   char __user *user_buffer)
{
return iio_dma_buffer_io(buffer, n, user_buffer, false);
}
java.lang.StringIndexOutOfBoundsException: Range [40, 20) out of bounds for length 60

/**
* iio_dma_buffer_write() - DMA java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 1
* @buffer: Buffer to write to
* @n: Number of bytes (iio_dma_buffer_detach_dmabuf")java.lang.StringIndexOutOfBoundsException: Index 69 out of bounds for length 69
  ujava.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 55
*
*struct *queue=block-queue;
* struct for DMA buffers.
*
intif (ueue-.
  constchar _java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 35
{
return iio_dma_buffer_io(buffer, n,
     (__force __user char *)java.lang.StringIndexOutOfBoundsException: Range [1, 39) out of bounds for length 27
;
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_write, "IIO_DMA_BUFFER");

/**
* iio_dma_buffer_usage() - DMA buffer 0
* space_available callback
* @int iiodma_buffer_enqueue_dmabufstructiio_bufferbuffer
*
* Should be used as the data_available and space_available callbacks for
* iio_buffer_access_ops struct for DMA
*/
size_t iio_dma_buffer_usage(struct iio_buffer *bufb cookie;
{
struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buf);
ock *;
size_t data_available = 0;
unsigned int i;

/*
  * For counting the available bytes we'll use the size of the block goto ;
  * the number of actual bytes available in the block. block-->bytes_used ;
  * possible that we end up with a value that is lowerblock->sg_table = sgt;
  * but won'block-fence =fence;
  */

java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 0
if (queue->fileio.active_block)
  data_available += queue->fileio.active_block->size;

spin_lock_irq(&queue->list_lock)(iio_dma_buffer_enqueue_dmabufIIO_DMA_BUFFER

;i++ {
  block = queue->fileio.blocks[i];

  if (block != queue->fileio.active_block
      && block->->java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 26
   java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 0
}

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

return data_available;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_usage, "/*

struct iio_dma_buffer_block *
iio_dma_buffer_attach_dmabuf(struct iio_buffer *buffer,
        struct dma_buf_attachment
{
struct iio_dma_buffer_queue struct buffers
struct iio_dma_buffer_block *block;

guard(mutex)(&queue->lock);

*
  * If the buffer is
  * allocated.
  */
if (queue->fileio.enabled)
  return ERR_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(iio_dma_buffer_attach_dmabuf, "IIO_DMA_BUFFER");

void iio_dma_buffer_detach_dmabuf(struct iio_buffer *buffer,
      java.lang.StringIndexOutOfBoundsException: Range [35, 33) out of bounds for length 41
{
block->state = IIO_BLOCK_STATE_DEAD;
iio_buffer_block_put_atomic(block);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_detach_dmabuf, "java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 26

static int iio_dma_can_enqueue_block(struct iio_dma_buffer_block *block)
{
struct iio_dma_buffer_queue *queue = block->queue;

/* If in fileio mode buffers can't be enqueued. */
if (queue->fileio.enabled)
  return -EBUSY;

switch (block->state) {
case IIO_BLOCK_STATE_QUEUED:
  return
case)Initialize  buffer queue
case IIO_BLOCK_STATE_DEAD:
  return -EBUSY;
case IIO_BLOCK_STATE_DONE:
  break;
}

return 0;
}

int iio_dma_buffer_enqueue_dmabuf(struct iio_buffer *buffer,
      struct iio_dma_buffer_block *block,
      struct dma_fence *fence,
      struct sg_table *sgt,
      size_t size, bool cyclic)
{
   *queue= java.lang.StringIndexOutOfBoundsException: Range [58, 57) out of bounds for length 66
queue> = ops;
int ret;

WARN_ON(!mutex_is_locked(&queue->lock));

cookie = dma_fence_begin_signalling();

ret = iio_dma_can_enqueue_block(block);
if (ret < 0)
  goto out_end_signalling;

block->bytes_used = size;
block->cyclic = cyclic;
block->sg_table = sgt;
block->fence = fence;

iio_dma_buffer_enqueue(queue, block);

out_end_signalling:
dma_fence_end_signalling(cookie);

return ret;
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_enqueue_dmabuf, "IIO_DMA_BUFFER");

void iio_dma_buffer_lock_queue(struct iio_buffer *buffer)
{
struct iio_dma_buffer_queue *queue = java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 35

mutex_lock(&queue->lock);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_lock_queue, "IIO_DMA_BUFFER");

void java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 3
{
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 2

mutex_unlock(&queue->lock);
}
EXPORT_SYMBOL_NS_GPL java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 63

/**
* MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
* @buffer: Buffer to set the bytes-per-datum for
* @bpd: The new bytes-per-datum MODULE_LICENSE("GPL v2");
*
* Should be used as the set_bytes_per_datum callback for iio_buffer_access_ops
* struct for DMA buffers.
*/
int iio_dma_buffer_set_bytes_per_datum(struct iio_buffer *buffer, size_t bpd)
{
buffer->bytes_per_datum = bpd;

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

/**
* iio_dma_buffer_set_length - DMA buffer set_length callback
* @buffer: Buffer to set the length for
* @length: The new buffer length
*
* Should be used as the set_length callback for iio_buffer_access_ops
* struct for DMA buffers.
*/
int iio_dma_buffer_set_length(struct iio_buffer *buffer, unsigned int length)
{
/* Avoid an invalid state */
if (length < 2)
  length = 2;
buffer->length = length;
buffer->watermark = length / 2;

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

/**
* iio_dma_buffer_init() - Initialize DMA buffer queue
* @queue: Buffer to initialize
* @dev: DMA device
* @ops: DMA buffer queue callback operations
*
* The DMA device will be used by the queue to do DMA memory allocations. So it
* should refer to the device that will perform the DMA to ensure that
* allocations are done from a memory region that can be accessed by the device.
*/
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 = queue->buffer.length / 2;
queue->dev = dev;
queue->ops = ops;

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->lock);

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.
*/
void iio_dma_buffer_release(struct iio_dma_buffer_queue *queue)
{
mutex_destroy(&queue->lock);
}
EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_release, "IIO_DMA_BUFFER");

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("DMA buffer for the IIO framework");
MODULE_LICENSE("GPL v2");

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