tree 12fd2d5402bea262d4a191504f3ad25b5263ae3a
parent b4287df82991ca608f44d7ac12ad9b3bc39d5baa
author Chris Metcalf <cmetcalf@ezchip.com> 1430774795 -0400
committer Chris Metcalf <cmetcalf@ezchip.com> 1431357751 -0400

tile: support delivering NMIs for multicore backtrace

A new hypervisor service was added some time ago (MDE 4.2.1 or
later, or MDE 4.3 or later) that allows cores to request NMIs
to be delivered to other cores.  Use this facility to deliver
a request that causes a backtrace to be generated on each core,
and hook it into the magic SysRq functionality.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>