From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@citrix.com>
Subject: Re: [PATCH] xen/arm64: Avoid sending SGI when kicking
 secondary cpus with spin_table
Date: Wed, 15 Apr 2015 18:54:17 +0100
Message-ID: <552EA5C9.9070201@citrix.com>
References: <1428392032-11551-1-git-send-email-cbz@baozis.org>
	<55251DB1.6050504@citrix.com> <1429109864.15516.318.camel@citrix.com>
	<552E8A3D.3070700@gmail.com> <1429114884.25195.5.camel@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1429114884.25195.5.camel@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Ian Campbell <ian.campbell@citrix.com>, Julien Grall <julien.grall.oss@gmail.com>
Cc: Chen Baozi <baozich@gmail.com>, Chen Baozi <cbz@baozis.org>, Iurii Konovalenko <iurii.konovalenko@globallogic.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org

Hi Ian,

On 15/04/2015 17:21, Ian Campbell wrote:

>>
>> Hmmm... I looked the wrong code in Linux :/.
>> The SGI is required for most of the platforms.
>
> Could you give a pointer to that code please.

The call to arch_send_wakeup_ipi_mask is done per-platform.
For the platforms supported by Xen:

arndale: mach-exynos/platsmp.c
omap5: mach-omap2/omap-smp.c

I wasn't able to find if RCAR (CC Iurii for it) and Vexpress really 
require an SGI to bring up secondary CPUs.

Regards,

-- 
Julien Grall