linux-kernel - hfi1 use of PCI internals

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Message-ID: <20160616162052.GA2144@localhost>
Date:	Thu, 16 Jun 2016 11:20:52 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Mike Marciniszyn <mike.marciniszyn@...el.com>,
	Dennis Dalessandro <dennis.dalessandro@...el.com>
Cc:	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: hfi1 use of PCI internals

I noticed drivers/infiniband/hw/hfi1 got moved from staging to
drivers/ for v4.7.  It does a bunch of grubbing around in PCIe ASPM
configuration, e.g., see drivers/infiniband/hw/hfi1/aspm.h.

I know there have been lots of ASPM issues, both hardware problems and
Linux kernel problems, but it is *supposed* to be manageable by the
core, without special driver support.  What's the justification for
having to do this in the hfi1 driver?

Bjorn