Conrad Meyer 0d0f264099 ioat(4): Use memory completion rather than device register ...

The CHANSTS register is a split 64-bit register on CBDMA units before
hardware v3.3.  If a torn read happens during ioat_process_events(),
software cannot know when to stop completing descriptors correctly.

So, just use the device-pushed main memory channel status instead.

Remove the ioat_get_active() seatbelt as well.  It does nothing if the
completion address is valid.

Sponsored by:	Dell EMC Isilon

2016-10-28 23:53:37 +00:00

..

ioat_hw.h

ioat(4): Export HW capabilities to consumers

2016-07-12 21:56:49 +00:00

ioat_internal.h

ioat(4): Use memory completion rather than device register

2016-10-28 23:53:37 +00:00

ioat_test.c

ioat(4): ioat_get_dmaengine(): Add M_WAITOK mode

2016-04-09 13:15:34 +00:00

ioat_test.h

ioatcontrol(8): Add support for interrupt coalescing

2015-12-14 22:02:01 +00:00

ioat.c

ioat(4): Use memory completion rather than device register

2016-10-28 23:53:37 +00:00

ioat.h

ioat(4): Export HW capabilities to consumers

2016-07-12 21:56:49 +00:00