dmaengine: ack to flags: make use of the unused bits in the 'ack' field

'ack' is currently a simple integer that flags whether or not a client is done
touching fields in the given descriptor.  It is effectively just a single bit
of information.  Converting this to a flags parameter allows the other bits to
be put to use to control completion actions, like dma-unmap, and capture
results, like xor-zero-sum == 0.

Changes are one of:
1/ convert all open-coded ->ack manipulations to use async_tx_ack
   and async_tx_test_ack.
2/ set the ack bit at prep time where possible
3/ make drivers store the flags at prep time
4/ add flags to the device_prep_dma_interrupt prototype

Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 1517fe4e2d14..318e8a22d814 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -212,14 +212,14 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
         u32 copy;
         size_t len;
         dma_addr_t src, dst;
-        int orig_ack;
+        unsigned long orig_flags;
         unsigned int desc_count = 0;
 
         /* src and dest and len are stored in the initial descriptor */
         len = first->len;
         src = first->src;
         dst = first->dst;
-        orig_ack = first->async_tx.ack;
+        orig_flags = first->async_tx.flags;
         new = first;
 
         spin_lock_bh(&ioat_chan->desc_lock);
@@ -228,7 +228,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
         do {
                 copy = min_t(size_t, len, ioat_chan->xfercap);
 
-                new->async_tx.ack = 1;
+                async_tx_ack(&new->async_tx);
 
                 hw = new->hw;
                 hw->size = copy;
@@ -264,7 +264,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
         }
 
         new->tx_cnt = desc_count;
-        new->async_tx.ack = orig_ack; /* client is in control of this ack */
+        new->async_tx.flags = orig_flags; /* client is in control of this ack */
 
         /* store the original values for use in later cleanup */
         if (new != first) {
@@ -304,14 +304,14 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
         u32 copy;
         size_t len;
         dma_addr_t src, dst;
-        int orig_ack;
+        unsigned long orig_flags;
         unsigned int desc_count = 0;
 
         /* src and dest and len are stored in the initial descriptor */
         len = first->len;
         src = first->src;
         dst = first->dst;
-        orig_ack = first->async_tx.ack;
+        orig_flags = first->async_tx.flags;
         new = first;
 
         /*
@@ -321,7 +321,7 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
         do {
                 copy = min_t(size_t, len, ioat_chan->xfercap);
 
-                new->async_tx.ack = 1;
+                async_tx_ack(&new->async_tx);
 
                 hw = new->hw;
                 hw->size = copy;
@@ -349,7 +349,7 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
         }
 
         new->tx_cnt = desc_count;
-        new->async_tx.ack = orig_ack; /* client is in control of this ack */
+        new->async_tx.flags = orig_flags; /* client is in control of this ack */
 
         /* store the original values for use in later cleanup */
         if (new != first) {
@@ -714,7 +714,7 @@ static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy(
                 new->len = len;
                 new->dst = dma_dest;
                 new->src = dma_src;
-                new->async_tx.ack = 0;
+                new->async_tx.flags = flags;
                 return &new->async_tx;
         } else
                 return NULL;
@@ -742,7 +742,7 @@ static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy(
                 new->len = len;
                 new->dst = dma_dest;
                 new->src = dma_src;
-                new->async_tx.ack = 0;
+                new->async_tx.flags = flags;
                 return &new->async_tx;
         } else
                 return NULL;
@@ -842,7 +842,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
                                  * a completed entry, but not the last, so clean
                                  * up if the client is done with the descriptor
                                  */
-                                if (desc->async_tx.ack) {
+                                if (async_tx_test_ack(&desc->async_tx)) {
                                         list_del(&desc->node);
                                         list_add_tail(&desc->node,
                                                       &ioat_chan->free_desc);
@@ -979,7 +979,7 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
         desc->hw->size = 0;
         desc->hw->src_addr = 0;
         desc->hw->dst_addr = 0;
-        desc->async_tx.ack = 1;
+        async_tx_ack(&desc->async_tx);
         switch (ioat_chan->device->version) {
         case IOAT_VER_1_2:
                 desc->hw->next = 0;