dmaengine: add dmaengine_get_copy_align() and related alignment getter helpers

Add dmaengine_get_copy_align(), dmaengine_get_xor_align(),
dmaengine_get_pq_align(), and dmaengine_get_fill_align() inline
helpers to retrieve the alignment requirement of a DMA channel as
a power-of-2 exponent.

These complement the existing dmaengine_is_*_aligned() test helpers
by providing direct access to the alignment value, which is useful
when callers need to propagate or compare alignment constraints.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20261005-dmaengine_prep_dma_pq-v3-3-a4a241f26fa7@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 07fe91bdd8d7..efe421503501 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1558,6 +1558,54 @@ static inline bool is_dma_fill_aligned(struct dma_device *dev, size_t off1,
 }
 
 /**
+ * dmaengine_get_copy_align - get copy alignment requirement of a DMA channel
+ * @chan: DMA channel
+ *
+ * Return the copy alignment requirement of @chan as a power-of-2 exponent.
+ */
+static inline enum dmaengine_alignment
+dmaengine_get_copy_align(struct dma_chan *chan)
+{
+	return chan->device->copy_align;
+}
+
+/**
+ * dmaengine_get_xor_align - get xor alignment requirement of a DMA channel
+ * @chan: DMA channel
+ *
+ * Return the xor alignment requirement of @chan as a power-of-2 exponent.
+ */
+static inline enum dmaengine_alignment
+dmaengine_get_xor_align(struct dma_chan *chan)
+{
+	return chan->device->xor_align;
+}
+
+/**
+ * dmaengine_get_pq_align - get pq alignment requirement of a DMA channel
+ * @chan: DMA channel
+ *
+ * Return the pq alignment requirement of @chan as a power-of-2 exponent.
+ */
+static inline enum dmaengine_alignment
+dmaengine_get_pq_align(struct dma_chan *chan)
+{
+	return chan->device->pq_align;
+}
+
+/**
+ * dmaengine_get_fill_align - get fill alignment requirement of a DMA channel
+ * @chan: DMA channel
+ *
+ * Return the fill alignment requirement of @chan as a power-of-2 exponent.
+ */
+static inline enum dmaengine_alignment
+dmaengine_get_fill_align(struct dma_chan *chan)
+{
+	return chan->device->fill_align;
+}
+
+/**
  * dmaengine_is_copy_aligned - test copy alignment
  * @chan: DMA channel
  * @off1: first buffer offset