dmaengine: add dmaengine_is_*_aligned() helpers for DMA consumers

DMA engine consumers typically hold a struct dma_chan pointer and should
not need to reach into struct dma_device directly to check alignment
requirements.  Add dmaengine_is_copy_aligned(), dmaengine_is_xor_aligned(),
dmaengine_is_pq_aligned() and dmaengine_is_fill_aligned() as channel-based
counterparts to the existing is_dma_*_aligned() family.

Each wrapper calls dmaengine_check_align() directly with the alignment
value from chan->device, keeping struct dma_device opaque to consumers.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20261005-dmaengine_prep_dma_pq-v3-2-a4a241f26fa7@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 143e5127c8d1..07fe91bdd8d7 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1557,6 +1557,70 @@ static inline bool is_dma_fill_aligned(struct dma_device *dev, size_t off1,
 	return dmaengine_check_align(dev->fill_align, off1, off2, len);
 }
 
+/**
+ * dmaengine_is_copy_aligned - test copy alignment
+ * @chan: DMA channel
+ * @off1: first buffer offset
+ * @off2: second buffer offset
+ * @len: transfer length
+ *
+ * Return true if off1, off2 and len satisfy the copy alignment requirement of
+ * the DMA channel, false otherwise.
+ */
+static inline bool dmaengine_is_copy_aligned(struct dma_chan *chan, size_t off1,
+					     size_t off2, size_t len)
+{
+	return dmaengine_check_align(chan->device->copy_align, off1, off2, len);
+}
+
+/**
+ * dmaengine_is_xor_aligned - test xor alignment
+ * @chan: DMA channel
+ * @off1: first buffer offset
+ * @off2: second buffer offset
+ * @len: transfer length
+ *
+ * Return true if off1, off2 and len satisfy the xor alignment requirement of
+ * the DMA channel, false otherwise.
+ */
+static inline bool dmaengine_is_xor_aligned(struct dma_chan *chan, size_t off1,
+					    size_t off2, size_t len)
+{
+	return dmaengine_check_align(chan->device->xor_align, off1, off2, len);
+}
+
+/**
+ * dmaengine_is_pq_aligned - test pq alignment
+ * @chan: DMA channel
+ * @off1: first buffer offset
+ * @off2: second buffer offset
+ * @len: transfer length
+ *
+ * Return true if off1, off2 and len satisfy the pq alignment requirement of
+ * the DMA channel, false otherwise.
+ */
+static inline bool dmaengine_is_pq_aligned(struct dma_chan *chan, size_t off1,
+					   size_t off2, size_t len)
+{
+	return dmaengine_check_align(chan->device->pq_align, off1, off2, len);
+}
+
+/**
+ * dmaengine_is_fill_aligned - test fill alignment
+ * @chan: DMA channel
+ * @off1: first buffer offset
+ * @off2: second buffer offset
+ * @len: transfer length
+ *
+ * Return true if off1, off2 and len satisfy the fill alignment requirement of
+ * the DMA channel, false otherwise.
+ */
+static inline bool dmaengine_is_fill_aligned(struct dma_chan *chan, size_t off1,
+					     size_t off2, size_t len)
+{
+	return dmaengine_check_align(chan->device->fill_align, off1, off2, len);
+}
+
 static inline void
 dma_set_maxpq(struct dma_device *dma, int maxpq, int has_pq_continue)
 {