On Thu, 2012-12-13 at 23:15 +0800, Jiang Liu wrote: > On 12/13/2012 10:42 PM, Toshi Kani wrote: > > On Tue, 2012-12-11 at 22:34 +0800, Jiang Liu wrote: > >> On 12/08/2012 09:08 AM, Toshi Kani wrote: > >>> On Fri, 2012-12-07 at 13:57 +0800, Jiang Liu wrote: > >>>> On 2012-12-7 10:57, Toshi Kani wrote: > >>>>> On Fri, 2012-12-07 at 00:40 +0800, Jiang Liu wrote: : > >>> > >>>> 2) an ACPI based hotplug manager driver, which is a platform independent > >>>> driver and manages all hotplug slot created by the slot driver. > >>> > >>> It is surely impressive work, but I think is is a bit overdoing. I > >>> expect hot-pluggable servers come with management console and/or GUI > >>> where a user can manage hardware units and initiate hot-plug operations. > >>> I do not think the kernel needs to step into such area since it tends to > >>> be platform-specific. > >> One of the major usages of this feature is for testing. > >> It will be hard for OSVs and OEMs to verify hotplug functionalities if it could > >> only be tested by physical hotplug or through management console. So to pave the > >> way for hotplug, we need to provide a mechanism for OEMs and OSVs to execute > >> auto stress tests for hotplug functionalities. > > > > Yes, but such OS->FW interface is platform-specific. Some platforms use > > IPMI for the OS to communicate with the management console. In this > > case, an OEM-specific command can be used to request a hotplug through > > IPMI. Some platforms may also support test programs to run on the > > management console for validations. > > > > For early development testing, Yinghai's SCI emulation patch can be used > > to emulate hotplug events from the OS. It would be part of the kernel > > debugging features once this patch is accepted. > Hi Toshi, > ACPI 5.0 has provided some mechanism to normalize the way to issue > RAS related requests to firmware. I hope ACPI 5.x will define some standardized > ways based on the PCC defined in 5.0. If needed, we may provide platform > specific methods for them too. Thanks for the pointer! Yeah, the spec purposely does not define the command. When we support PCC, we will need to provide a way for user app or oem module to supply a payload. Thanks, -Toshi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>