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! -Gerry > > > Thanks! > -Toshi > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
