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Re: [PATCH] keystone: adds cpu_die implementation

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  Re: [PATCH] keystone: adds cpu_die implementation "santosh.shilimkar@oracle.com" <santosh.shilimkar@oracle.com> - 2015-06-29 23:20 +0200

#1174113 — Re: [PATCH] keystone: adds cpu_die implementation

On 6/29/15 11:43 AM, Vitaly Andrianov wrote:
>
>
> On 06/29/2015 01:52 PM, Mark Rutland wrote:
>> On Mon, Jun 29, 2015 at 06:52:32PM +0100, Vitaly Andrianov wrote:
>>> This commit add cpu_die implementation
>>>
>>> Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
>>> ---
>>>
>>> The discussion of the "keystone: psci: adds cpu_die implementation"
>>> commit
>>> shows that if PCSI is enabled platform code doesn't need that
>>> implementation
>>> at all. Having PSCI commands in DTB should be sufficient. Unfortunately
>>> Keystone with LPAE enable requires some additional development.
>>
>> I don't follow.
>>
>> What do you need to implement for LPAE?
> Hi Mark,
>
> The Keystone platform needs to set ttbr1 when it boots secondary core.
> It is done in the keystone_smp_secondary_initmem(), which is
> .smp_secondary_init member of the keystone_smp_ops. I couldn't find a
> way how I can add similar function to psci_smp_ops.
>
> Do you have any idea?
>
>>
>> Why not implement that rather than adding more platform code that you'll
>> likely want to remove later anyway?
>
> If I can solve the above problem, I will not add this code.
>
This problem is already solved. :-)

After [1], there is no longer need to fiddle with TTBR1 setup
for secondary bringup.  I believe its already in RMK's queue and it
should show up in linus's tree after 4.2 merge window.


Regards,
Santosh

[1] http://www.spinics.net/lists/arm-kernel/msg416129.html

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