linux-kernel - Re: [PATCH] keystone: adds cpu

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Date:	Tue, 30 Jun 2015 09:47:55 -0400
From:	Vitaly Andrianov <vitalya@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Mark Rutland <mark.rutland@....com>,
	"grygorii.strashko@...com" <grygorii.strashko@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"ssantosh@...nel.org" <ssantosh@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] keystone: adds cpu_die implementation



On 06/29/2015 05:37 PM, Russell King - ARM Linux wrote:
> On Mon, Jun 29, 2015 at 10:28:14PM +0100, Russell King - ARM Linux wrote:
>> On Mon, Jun 29, 2015 at 02:43:44PM -0400, 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@...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.
>>
>> TTBR1 will be set by generic code.  You don't need to do anything special
>> now that my fixes for TI's horrid physical address space switch are in.
>> (you may remember, you tested the patches...)
>
> Oh, it was Murali who tested it, not yourself.  Sorry.  Suggest you
> dig out the patches either from mainline (they're in Linus' tip) or
> ask Murali for them...
>
Thanks Russell,

Excellent. I'll test how it will work using PSCI framework.

Regards,
Vitaly

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