ioat2,3: convert to producer/consumer locking

Use separate locks for the descriptor prep (producer) and descriptor
cleanup (consumer) paths.  Allows the producer path to run concurrently
with the cleanup path.  Inspired by Documentation/circular-buffer.txt.

Cc: David Howells <dhowells@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 86b97ac8774e..0c76578e9911 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -96,6 +96,7 @@ struct ioat_chan_common {
         #define IOAT_COMPLETION_ACK 1
         #define IOAT_RESET_PENDING 2
         #define IOAT_KOBJ_INIT_FAIL 3
+        #define IOAT_RESHAPE_PENDING 4
         struct timer_list timer;
         #define COMPLETION_TIMEOUT msecs_to_jiffies(100)
         #define IDLE_TIMEOUT msecs_to_jiffies(2000)