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    SubjectRe: [PATCH v2 1/7] ACPI: Add CONFIG_HOTPLUG_OST option
    On 05/11/2012 02:20 AM, Toshi Kani wrote:
    > On Fri, 2012-05-11 at 01:43 +0800, Jiang Liu wrote:
    >> On 05/11/2012 01:26 AM, Toshi Kani wrote:
    >>> On Fri, 2012-05-11 at 00:40 +0800, Jiang Liu wrote:
    >>>> On 05/09/2012 04:12 AM, Toshi Kani wrote:
    >>>>> Added CONFIG_ACPI_HOTPLUG_OPT option. When this config option is disabled,
    >>>>> this patchset has no effect on the platform. This option is disabled by
    >>>>> default. The dependency list assures consistent behavior among CPU, memory
    >>>>> and container hotplug operations with regarding the _OST support.
    >>>> Seems also need to enhance the acpiphp driver for PCI hotplug operations too.
    >>>> acpiphp driver is also based on the ACPI device hotplug model.
    >>> Good question. ACPI PCI hotplug is a legacy method, which is being
    >>> replaced by PCI native hotplug. I expect PCI native hotplug will be
    >>> used for any platforms supporting PCI-E. Since this _OST support is
    >>> targeted for new platforms (as _OST is not supported on the current
    >>> platforms), I thought that it would be prudent to avoid changing PCI
    >>> hotplug code for this.
    >> You are right, acpiphp is legacy method. But it may also be used to support
    >> some cases which can't be supported by the pciehp driver.
    >> For example, we have a PCIe system which needs to run acpiphp and pciehp
    >> concurrently. The pciehp driver is used to manage hot-pluggable PCIe slot,
    >> and the acpiphp driver is used to migrate downstream ports among virtual
    >> PCIe switches of an MR-IOV switch. It would be great if we could enable
    >> _OST for acpiphp too.
    >> To be honest, our BIOS doesn't provide _OST for acpiphp yet, so we could
    >> enhance acpiphp driver in future when a system really needing that feature
    >> appears.
    > Interesting. In such case, I am willing to change acpiphp, but I am
    > afraid that I do not have access to platforms with ACPI PCI hotplug
    > support. My test systems are all PCI-E based. So, it would be great if
    > you could enhance acpiphp when you need it.
    Sure, I will enhance it based on your work when needed.

    > Thanks!
    > -Toshi

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