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>
diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h
index 97d26ea..63038e1 100644
--- a/drivers/dma/ioat/registers.h
+++ b/drivers/dma/ioat/registers.h
@@ -243,6 +243,8 @@
#define IOAT_CHANERR_XOR_Q_ERR 0x20000
#define IOAT_CHANERR_DESCRIPTOR_COUNT_ERR 0x40000
+#define IOAT_CHANERR_HANDLE_MASK (IOAT_CHANERR_XOR_P_OR_CRC_ERR | IOAT_CHANERR_XOR_Q_ERR)
+
#define IOAT_CHANERR_MASK_OFFSET 0x2C /* 32-bit Channel Error Register */
#endif /* _IOAT_REGISTERS_H_ */