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

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Date:	Sun, 23 Jun 2013 00:43:08 +0300
From:	Illya Klymov <xanf@...f.me>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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

Hi, guys. Sorry for entering your talk
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!

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.
> --
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