Messages in this thread | | | Date | Tue, 12 Jan 2016 11:51:04 +0000 | From | Mark Rutland <> | Subject | Re: [RFC PATCH v2] Add IPI entry for CPU UP |
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On Tue, Jan 12, 2016 at 09:38:20AM +0000, Lorenzo Pieralisi wrote: > On Tue, Jan 12, 2016 at 10:17:42AM +0800, Zhaoyang Huang wrote: > > On 12 January 2016 at 10:05, Zhaoyang Huang <zhaoyang.huang@linaro.org> wrote: > > > In some ARM SOCs, IPI interrupt is used for hotplug in one cpu, that is, > > > sending a IPI to the core in WFI and powerdown status. So Add a IPI > > > entry for handle this kind of cpu up interrupt > > > Launching the IPI can be done within PSCI, while there will be one unknown > > > type of IPI as the dest core come up to the kernel world which will bring a > > > warning so far.So add such type of IPI to handle the interrupt. > > You missed CC'ing ALKML for the second time and you were warned. > > You are adding a call to *send* an IPI in the kernel so the commit > above is misleading. > > Acknowledge and clear the IRQ in FW so that the mechanism is completely > implemented in FW (ie PSCI), that the CPU coming out of reset will run > before getting to the kernel, this patch is not needed and we already > explained to you why. > > Lorenzo
I would also suggest that FW used the set of SGIs reserved for secure usage (i.e. ID8 - ID15), as these will not conflict with those the kernel uses.
Thanks, Mark.
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