[Bug 240340] [patch] MFC r351747 Implement nvme suspend / resume for pci attachment

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240340

            Bug ID: 240340
           Summary: [patch] MFC r351747 Implement nvme suspend / resume
                    for pci attachment
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: theron.tarigo at gmail.com

Created attachment 207200
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=207200&action=edit
nvme resume patch

CURRENT r351747 fixes the 30s delay after resume for some users.

12.0-STABLE currently does not resume properly for me due to some other problem
that I have not investigated, but unrelated to nvme (12.0-RELEASE works, but
with the nvme timeout delay).

I applied the changes to 12.0-STABLE and then copied the entire sys/dev/nvme to
my 12.0-RELEASE src tree.  After rebuild and install, the nvme timeout problem
is fixed.  I assume this would work just as well on full 12.0-STABLE, but I
can't test this just yet.

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