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iio: buffer-dmaengine: Report buffer length requirements

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The dmaengine buffer has some length alignment requirements that can differ
from platform to platform. If the length alignment requirements are not met
unexpected behavior like dropping of samples can occur.

Currently these requirements are not reported and applications need to know
the requirements of the platform by some out-of-band means.

Add a new buffer attribute that reports the length alignment requirements
called `length_align_bytes`. The reported length alignment is in bytes that
means the buffer length alignment in sample sets depends on the number of
enabled channels and the bytes per channel. Applications using this
attribute to determine the buffer size requirements need to consider this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lars-Peter Clausen 2019-12-11 13:56:15 +02:00 committed by Jonathan Cameron
parent 2a4fb4def9
commit 4538c18568
2 changed files with 40 additions and 0 deletions
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19
Documentation/ABI/testing/sysfs-bus-iio-dma-buffer Normal file
View file

@ -0,0 +1,19 @@
What: /sys/bus/iio/devices/iio:deviceX/buffer/length_align_bytes
KernelVersion: 5.4
Contact: linux-iio@vger.kernel.org
Description:
DMA buffers tend to have a alignment requirement for the
buffers. If this alignment requirement is not met samples might
be dropped from the buffer.
This property reports the alignment requirements in bytes.
This means that the buffer size in bytes needs to be a integer
multiple of the number reported by this file.
The alignment requirements in number of sample sets will depend
on the enabled channels and the bytes per channel. This means
that the alignment requirement in samples sets might change
depending on which and how many channels are enabled. Whereas
the alignment requirement reported in bytes by this property
will remain static and does not depend on which channels are
enabled.

21
drivers/iio/buffer/industrialio-buffer-dmaengine.c
View file

@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/buffer_impl.h>
#include <linux/iio/buffer-dma.h>
@ -126,6 +127,24 @@ static const struct iio_dma_buffer_ops iio_dmaengine_default_ops = {
.abort = iio_dmaengine_buffer_abort,
};
static ssize_t iio_dmaengine_buffer_get_length_align(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct dmaengine_buffer *dmaengine_buffer =
iio_buffer_to_dmaengine_buffer(indio_dev->buffer);
return sprintf(buf, "%u\n", dmaengine_buffer->align);
}
static IIO_DEVICE_ATTR(length_align_bytes, 0444,
iio_dmaengine_buffer_get_length_align, NULL, 0);
static const struct attribute *iio_dmaengine_buffer_attrs[] = {
&iio_dev_attr_length_align_bytes.dev_attr.attr,
NULL,
};
/**
* iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
* @dev: Parent device for the buffer
@ -179,6 +198,8 @@ struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
iio_dma_buffer_init(&dmaengine_buffer->queue, chan->device->dev,
&iio_dmaengine_default_ops);
iio_buffer_set_attrs(&dmaengine_buffer->queue.buffer,
iio_dmaengine_buffer_attrs);
dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;