ioat2,3: dynamically resize descriptor ring

Increment the allocation order of the descriptor ring every time we run
out of descriptors up to a maximum of allocation order specified by the
module parameter 'ioat_max_alloc_order'.  After each idle period
decrement the allocation order to a minimum order of
'ioat_ring_alloc_order' (i.e. the default ring size, tunable as a module
parameter).

Signed-off-by: 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 dbfccac3e80c..d9d6a7e3cd76 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -88,6 +88,7 @@ struct ioat_chan_common {
         #define IOAT_RESET_PENDING 2
         struct timer_list timer;
         #define COMPLETION_TIMEOUT msecs_to_jiffies(100)
+        #define IDLE_TIMEOUT msecs_to_jiffies(2000)
         #define RESET_DELAY msecs_to_jiffies(100)
         struct ioatdma_device *device;
         dma_addr_t completion_dma;