On Thu, 29 Sep 2016, tj@kernel.org wrote:

On Wed, Sep 28, 2016 at 05:45:08AM +0000, Shah, Nehal-bakulchandra wrote:

quoted

Can someone please help me to debug this issue?

The only thing I can do from libata side is disbling msi on the
affected platform, but the problem doesn't seem confined to ahci, so
probably the right thing to do for now is disabling msi on the
platform?

Actually, according to Shah's post from the 26th to this thread,
everything works just fine even with the IOMMU enabled, as long as the
system is configured to NOT auto-shutdown unused SATA ports.

That seems to give some extra avenues at fixing/working around the
issue, maybe?

-- 
  Henrique Holschuh