linux-kernel - Re: [RFC PATCH 0/5] Add smp booting support for Qualcomm ARMv8 SoCs

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Message-Id: <AF65C7BF-CBBD-4E03-95AA-495830D6DC20@codeaurora.org>
Date:	Fri, 10 Apr 2015 10:25:54 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"abhimany@...eaurora.org" <abhimany@...eaurora.org>
Subject: Re: [RFC PATCH 0/5] Add smp booting support for Qualcomm ARMv8 SoCs


On Apr 10, 2015, at 6:03 AM, Lorenzo Pieralisi <lorenzo.pieralisi@....com> wrote:

> On Thu, Apr 09, 2015 at 06:37:06PM +0100, Kumar Gala wrote:
>> This patch set adds support for SMP boot on the MSM8x16 family of Qualcomm SoCs.
>> 
>> To support SMP on the MSM8x16 SoCs we need to add ARMv8/64-bit SCM interfaces to
>> setup the boot/release addresses for the secondary CPUs.  In addition we need
>> a uniquie set of cpu ops.  I'm aware the desired methods for booting secondary
>> CPUs is either via spintable or PSCI.  However, these SoCs are shipping with a
>> firmware that does not support those methods.
> 
> Why ? Do not tell me you were not aware of those standard methods,
> because I can't believe you.
> 
> If there were additional features to add to spin-table and PSCI,
> you were, you are and you will always be welcome to debate them.
> 
> There is no justification for this patchset, honestly.
> 
> Lorenzo

The justification for this patchset is support for a hardware platform that exists in the world.  The kernel usual is willing to accept such things as long as the code is reasonable.

- k

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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