Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756263AbcDGMG5 (ORCPT ); Thu, 7 Apr 2016 08:06:57 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:28830 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756084AbcDGME2 (ORCPT ); Thu, 7 Apr 2016 08:04:28 -0400 From: Shannon Zhao To: , CC: , , , , , , , , , Subject: [PATCH v11 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Date: Thu, 7 Apr 2016 20:03:29 +0800 Message-ID: <1460030614-16112-13-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 In-Reply-To: <1460030614-16112-1-git-send-email-zhaoshenglong@huawei.com> References: <1460030614-16112-1-git-send-email-zhaoshenglong@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090202.57064CC8.00BB,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 4e93e60ca0f270d15694212fcd692cae Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1591 Lines: 48 From: Shannon Zhao When it's a Xen domain0 booting with ACPI, it will supply a /chosen and a /hypervisor node in DT. So check if it needs to enable ACPI. Signed-off-by: Shannon Zhao Reviewed-by: Stefano Stabellini Acked-by: Hanjun Guo --- arch/arm64/kernel/acpi.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index d1ce8e2..57ee317 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -67,10 +67,15 @@ static int __init dt_scan_depth1_nodes(unsigned long node, { /* * Return 1 as soon as we encounter a node at depth 1 that is - * not the /chosen node. + * not the /chosen node, or /hypervisor node with compatible + * string "xen,xen". */ - if (depth == 1 && (strcmp(uname, "chosen") != 0)) - return 1; + if (depth == 1 && (strcmp(uname, "chosen") != 0)) { + if (strcmp(uname, "hypervisor") != 0 || + !of_flat_dt_is_compatible(node, "xen,xen")) + return 1; + } + return 0; } @@ -184,7 +189,8 @@ void __init acpi_boot_table_init(void) /* * Enable ACPI instead of device tree unless * - ACPI has been disabled explicitly (acpi=off), or - * - the device tree is not empty (it has more than just a /chosen node) + * - the device tree is not empty (it has more than just a /chosen node, + * and a /hypervisor node when running on Xen) * and ACPI has not been force enabled (acpi=force) */ if (param_acpi_off || -- 2.0.4