From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hanjun Guo Subject: Re: [PATCH v3 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Date: Wed, 27 Jan 2016 16:27:35 +0800 Message-ID: <56A87F77.8070506@linaro.org> References: <1453519184-11908-1-git-send-email-zhaoshenglong@huawei.com> <1453519184-11908-13-git-send-email-zhaoshenglong@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1453519184-11908-13-git-send-email-zhaoshenglong@huawei.com> Sender: linux-kernel-owner@vger.kernel.org To: Shannon Zhao , linux-arm-kernel@lists.infradead.org, ard.biesheuvel@linaro.org, mark.rutland@arm.com, stefano.stabellini@citrix.com, david.vrabel@citrix.com Cc: catalin.marinas@arm.com, will.deacon@arm.com, julien.grall@citrix.com, xen-devel@lists.xen.org, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, ian.campbell@citrix.com, shannon.zhao@linaro.org, peter.huangpeng@huawei.com List-Id: devicetree@vger.kernel.org Hi Shannon, On 2016/1/23 11:19, Shannon Zhao wrote: > 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 > --- > CC: Hanjun Guo > --- > arch/arm64/kernel/acpi.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c > index d1ce8e2..4e92be0 100644 > --- a/arch/arm64/kernel/acpi.c > +++ b/arch/arm64/kernel/acpi.c > @@ -67,10 +67,13 @@ 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 when running on Xen. The comment is bit misleading, we need to specify two mode, running on Xen or not, if not on xen, then /chosen node is enough. > */ > - if (depth == 1 && (strcmp(uname, "chosen") != 0)) > - return 1; > + if (depth == 1 && (strcmp(uname, "chosen") != 0)) { > + if (!xen_initial_domain() || (strcmp(uname, "hypervisor") != 0)) > + return 1; > + } > + > return 0; > } > > @@ -184,7 +187,8 @@ 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 here too. if that is addressed, Acked-by: Hanjun Guo Thanks Hanjun