linux-kernel - Re: [PATCH 0/3] ACPI / dock / PCI: Fix problems with dock and PCI hotplug

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Message-ID: <13614446.CdHJ9aCn7p@vostro.rjw.lan>
Date:	Sun, 23 Jun 2013 01:26:06 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Illya Klymov <xanf@...f.me>
Cc:	linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"Alexander E . Patrakov" <patrakov@...il.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Jiang Liu <liuj97@...il.com>,
	linux-pci <linux-pci@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] ACPI / dock / PCI: Fix problems with dock and PCI hotplug

On Sunday, June 23, 2013 12:43:08 AM Illya Klymov wrote:
> Hi, guys. Sorry for entering your talk

Hi,

No problem at all. :-)

> I have a Sony Vaio SVZ1311Z9RXI and just tested your patched against
> 3.10-rc7 and they work like a charm
> scenarios tested:
> - boot with dock
> - boot without dock, hotplug dock
> - dock / undock / redock
> 
> All devices tested to be working in all 3 cases:
> - video card
> - ethernet controller
> - blue ray drive
> - USB controller
> 
> Thank you a lot!

I'm glad that the patches work for you, thanks a lot for letting us know!

Rafael


> On Sun, Jun 23, 2013 at 12:19 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > Hi All,
> >
> > Unfortunately, the Alexander's docking station for Sony VAIO VPCZ23A4R is
> > basically unusable with v3.10-rc6 and, as it turns out, there are multiple
> > problems with it.
> >
> > First, the acpiphp initialization ordering has changed recently,
> > acpiphp_enumerate_slots() is now always run for the first time during the
> > initial ACPI namespace scan in acpi_scan_init() which has broken support
> > for PCI devices on ACPI-based docking stations, because the ACPI dock
> > subsystem has to be initialized *before* acpiphp_enumerate_slots() is first
> > run.
> >
> > Fix that, and it turns out that undocking actually doesn't work correctly
> > because of some synchronization problems between the dock driver, acpiphp
> > and the PCI core.  [That part was actually the most difficult to fix.]
> >
> > Fix that, and you'll find that PCI resources are not allocated correctly
> > after undocking and re-docking (when initially docked).
> >
> > The three patches in this series make the Alexander's docking station kind
> > of usable, so if no one has objections, I'd like to put them on a fast track
> > to Linus.
> >
> > [1/3] Initialize ACPI dock subsystem before enumerating the PCI hierarchy
> >       (that also makes the dock driver non-modular).
> >
> > [2/3] Make acpiphp use the same rules for allocating PCI resources that are
> >       used at boot time.
> >
> > [3/3] Make acpiphp handle dock events synchronously (instead of spawning
> >       separate work items to handle them).  [The changelog of this patch
> >       is likely one of the longest I've ever written and it sort of looks
> >       like a crime story.]
> >
> > This series is mostly based on the work of Jiang Liu (thanks Gerry!) and
> > the Alexander's testing that we wouldn't have done much progress without
> > (thanks Alexander!).
> >
> > Alexander, I've modified patch [3/3] a bit since you have tested it.
> > The modifications shouldn't affect the behavior, but if you could re-test it,
> > that would be great.
> >
> > Thanks,
> > Rafael
> >
> >
> > --
> > I speak only for myself.
> > Rafael J. Wysocki, Intel Open Source Technology Center.
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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