dmaengine, async_tx: support alignment checks

Some engines have transfer size and address alignment restrictions.  Add
a per-operation alignment property to struct dma_device that the async
routines and dmatest can use to check alignment capabilities.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 58e49e41c7a3..a3722a7384b5 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -288,6 +288,7 @@ static int dmatest_func(void *data)
                 dma_addr_t dma_dsts[dst_cnt];
                 struct completion cmp;
                 unsigned long tmo = msecs_to_jiffies(3000);
+                u8 align = 0;
 
                 total_tests++;
 
@@ -295,6 +296,18 @@ static int dmatest_func(void *data)
                 src_off = dmatest_random() % (test_buf_size - len + 1);
                 dst_off = dmatest_random() % (test_buf_size - len + 1);
 
+                /* honor alignment restrictions */
+                if (thread->type == DMA_MEMCPY)
+                        align = dev->copy_align;
+                else if (thread->type == DMA_XOR)
+                        align = dev->xor_align;
+                else if (thread->type == DMA_PQ)
+                        align = dev->pq_align;
+
+                len = (len >> align) << align;
+                src_off = (src_off >> align) << align;
+                dst_off = (dst_off >> align) << align;
+
                 dmatest_init_srcs(thread->srcs, src_off, len);
                 dmatest_init_dsts(thread->dsts, dst_off, len);
 
@@ -311,6 +324,7 @@ static int dmatest_func(void *data)
                                                      DMA_BIDIRECTIONAL);
                 }
 
+
                 if (thread->type == DMA_MEMCPY)
                         tx = dev->device_prep_dma_memcpy(chan,
                                                          dma_dsts[0] + dst_off,