[PATCH v5 1/7] iio: make IIO_DMA_MINALIGN minimum of 8 bytes

[David Lechner]

Add a condition to ensure that IIO_DMA_MINALIGN is at least 8 bytes.
On some 32-bit architectures, IIO_DMA_MINALIGN is 4. In many cases,
drivers are using this alignment for buffers that include a 64-bit
timestamp that is used with iio_push_to_buffers_with_ts(), which expects
the timestamp to be aligned to 8 bytes. To handle this, we can just make
IIO_DMA_MINALIGN at least 8 bytes.

Signed-off-by: David Lechner <dlechner at baylibre.com>
---
 include/linux/iio/iio.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 638cf2420fbd85cf2924d09d061df601d1d4bb2a..7e1e3739328d103262071bd34ba5f6631163c122 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -775,8 +775,18 @@ static inline void *iio_device_get_drvdata(const struct iio_dev *indio_dev)
  * to in turn include IIO_DMA_MINALIGN'd elements such as buffers which
  * must not share  cachelines with the rest of the structure, thus making
  * them safe for use with non-coherent DMA.
+ *
+ * A number of drivers also use this on buffers that include a 64-bit timestamp
+ * that is used with iio_push_to_buffer_with_ts(). Therefore, in the case where
+ * DMA alignment is not sufficient for proper timestamp alignment, we align to
+ * 8 bytes instead.
  */
+#if ARCH_DMA_MINALIGN < sizeof(s64)
+#define IIO_DMA_MINALIGN sizeof(s64)
+#else
 #define IIO_DMA_MINALIGN ARCH_DMA_MINALIGN
+#endif
+
 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv);
 
 /* The information at the returned address is guaranteed to be cacheline aligned */

-- 
2.43.0