ioat3: xor support

ioat3.2 adds xor offload support for up to 8 sources.  It can also
perform an xor-zero-sum operation to validate whether all given sources
sum to zero, without writing to a destination.  Xor descriptors differ
from memcpy in that one operation may require multiple descriptors
depending on the number of sources.  When the number of sources exceeds
5 an extended descriptor is needed.  These descriptors need to be
accounted for when updating the DMA_COUNT register.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h
index fa030f8e1f27..e23027d3dcbd 100644
--- a/drivers/dma/ioat/dma_v2.h
+++ b/drivers/dma/ioat/dma_v2.h
@@ -127,6 +127,7 @@ static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len
  * @raw: hardware raw (un-typed) descriptor
  * @txd: the generic software descriptor for all engines
  * @len: total transaction length for unmap
+ * @result: asynchronous result of validate operations
  * @id: identifier for debug
  */
 
@@ -143,6 +144,7 @@ struct ioat_ring_ent {
         };
         struct dma_async_tx_descriptor txd;
         size_t len;
+        enum sum_check_flags *result;
         #ifdef DEBUG
         int id;
         #endif
@@ -180,5 +182,6 @@ enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie,
                                   dma_cookie_t *done, dma_cookie_t *used);
 void __ioat2_restart_chan(struct ioat2_dma_chan *ioat);
 bool reshape_ring(struct ioat2_dma_chan *ioat, int order);
+void __ioat2_issue_pending(struct ioat2_dma_chan *ioat);
 extern struct kobj_type ioat2_ktype;
 #endif /* IOATDMA_V2_H */