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>

4 files changed, 9 insertions, 6 deletions

diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index b38cbb3fd527..0ec1fb69d4ea 100644
--- a/crypto/async_tx/async_memcpy.c
+++ b/crypto/async_tx/async_memcpy.c
@@ -50,7 +50,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
         struct dma_device *device = chan ? chan->device : NULL;
         struct dma_async_tx_descriptor *tx = NULL;
 
-        if (device) {
+        if (device && is_dma_copy_aligned(device, src_offset, dest_offset, len)) {
                 dma_addr_t dma_dest, dma_src;
                 unsigned long dma_prep_flags = 0;
 
diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c
index a374784e3329..58e4a8752aee 100644
--- a/crypto/async_tx/async_memset.c
+++ b/crypto/async_tx/async_memset.c
@@ -47,7 +47,7 @@ async_memset(struct page *dest, int val, unsigned int offset, size_t len,
         struct dma_device *device = chan ? chan->device : NULL;
         struct dma_async_tx_descriptor *tx = NULL;
 
-        if (device) {
+        if (device && is_dma_fill_aligned(device, offset, 0, len)) {
                 dma_addr_t dma_dest;
                 unsigned long dma_prep_flags = 0;
 
diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c
index a25e290c39fb..b88db6d1dc65 100644
--- a/crypto/async_tx/async_pq.c
+++ b/crypto/async_tx/async_pq.c
@@ -211,7 +211,8 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
 
         if (dma_src && device &&
             (src_cnt <= dma_maxpq(device, 0) ||
-             dma_maxpq(device, DMA_PREP_CONTINUE) > 0)) {
+             dma_maxpq(device, DMA_PREP_CONTINUE) > 0) &&
+            is_dma_pq_aligned(device, offset, 0, len)) {
                 /* run the p+q asynchronously */
                 pr_debug("%s: (async) disks: %d len: %zu\n",
                          __func__, disks, len);
@@ -274,7 +275,8 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
         else if (sizeof(dma_addr_t) <= sizeof(struct page *))
                 dma_src = (dma_addr_t *) blocks;
 
-        if (dma_src && device && disks <= dma_maxpq(device, 0)) {
+        if (dma_src && device && disks <= dma_maxpq(device, 0) &&
+            is_dma_pq_aligned(device, offset, 0, len)) {
                 struct device *dev = device->dev;
                 dma_addr_t *pq = &dma_src[disks-2];
                 int i;
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index db279872ef3d..b459a9034aac 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -193,7 +193,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset,
         else if (sizeof(dma_addr_t) <= sizeof(struct page *))
                 dma_src = (dma_addr_t *) src_list;
 
-        if (dma_src && chan) {
+        if (dma_src && chan && is_dma_xor_aligned(chan->device, offset, 0, len)) {
                 /* run the xor asynchronously */
                 pr_debug("%s (async): len: %zu\n", __func__, len);
 
@@ -265,7 +265,8 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
         else if (sizeof(dma_addr_t) <= sizeof(struct page *))
                 dma_src = (dma_addr_t *) src_list;
 
-        if (dma_src && device && src_cnt <= device->max_xor) {
+        if (dma_src && device && src_cnt <= device->max_xor &&
+            is_dma_xor_aligned(device, offset, 0, len)) {
                 unsigned long dma_prep_flags = 0;
                 int i;