[PATCHSET 09/11] implement ata_link

[Tejun Heo <htejun@gmail.com>]

Hellooo.

This is part of patchset series described in [T].

This is the first take of implement-ata_link patchset.  This patchset
contains 14 patches which can be categorized as follows.

#01   : prep
#02-03: implement ata_link
#04-06: make parts of libata deal with link instead of port
#07-09: misc link stuff (link init, reset_tries, ata_link_abort())
#10-14: add ap->pm_link[] and update parts of libata to deal with
        multiple links

ata_link abstracts PHY and sits between ata_port and ata_device.  The
following attributes are moved to ata_link from ata_port.

- active command state (active_tag, sactive)
- [hw_]sata_spd_limit
- eh_info and eh_context
- device array

With above and a few extra fields, a link can fully host attached
devices including qc management and EH/hotplug.  This patchset makes
libata ready to handle PM links.

This patchset is against

  upstream (acc696d93dcf993dec123d69d599979e1456ffec)
  + [1] prep-for-new-EH patchset
  + [2] new-EH-framework patchset, take 3
  + [3] new-EH-implementation patchset, take 3
  + [4] merge-irq-pio patchset
  + [5] add-NCQ-support patchset, take 3
  + [6] prep-for-hotplug support, take 2
  + [7] prep-LLDDs-for-hotplug-support, take 1
  + [8] add-hotplug-support, take 2

--
tejun

[T] http://article.gmane.org/gmane.linux.ide/9957
[1] http://article.gmane.org/gmane.linux.ide/9959
[2] http://article.gmane.org/gmane.linux.ide/9984
[3] http://article.gmane.org/gmane.linux.ide/9995
[4] http://article.gmane.org/gmane.linux.ide/10005
[5] http://article.gmane.org/gmane.linux.ide/10011
[6] http://article.gmane.org/gmane.linux.ide/10028
[7] http://article.gmane.org/gmane.linux.ide/10063
[8] http://article.gmane.org/gmane.linux.ide/10073