linux-kernel - Linux script to enable ASPM / Documentation for ASPM

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Message-ID: <AANLkTikmFJAHEBwAZ_lPosAZH3JO2zA5KetXuHvfe4WT@mail.gmail.com>
Date:	Mon, 21 Jun 2010 15:58:35 -0700
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-wireless <linux-wireless@...r.kernel.org>,
	Martin Mares <mj@....cz>
Subject: Linux script to enable ASPM / Documentation for ASPM

ASPM was a dark magic when I first started looking at it. Some of it
is still dark but what I was able to understand with the help of
colleagues at work I've managed to stash here for now:

http://wireless.kernel.org/en/users/Documentation/ASPM

Then enabling ASPM was also quite a challenge and I always had to go
back and revisit the procedures, so to help with that instead I wrote
a script to do this for you correctly:

http://kernel.org/pub/linux/kernel/people/mcgrof/aspm/enable-aspm

Its sha1sum is: f5804fdab512065f219e55addf78c6654f1fc045

If any of that looks confusing refer to the documentation above.

There's a TODO there, so I'll get to the different items when I can
but if you like feel free to send me patches as well:

 TODO: patches are welcomed to me until we submit to to
       PCI Utilities upstream.

 This can be improved by in this order:

        * Accept arguments for endpoint and root complex address, and
          desired ASPM settings
        * Look for your ASPM capabilities by quering your
          LnkCap register first. Use these values to let you
          select whether you want to enable only L1 or L1 & L0s
        * Searching for your root complex for you
        * Search for your PCI device by using the driver
        * Disable your driver and ask to reboot ?
        * Rewrite in C
        * Write ncurses interface [ wishlist ]
        * Write GTK/QT interface [ wishlist ]
        * Submit upstream as aspm.c to the PCI Utilities, which are
          maintained by Martin Mares <mj@....cz>

  Luis
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