From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shannon Zhao Subject: Re: [PATCH v4 05/21] arm/acpi: Add basic ACPI initialization Date: Thu, 28 Jan 2016 19:18:58 +0800 Message-ID: <56A9F922.4050207@huawei.com> References: <1453540813-15764-1-git-send-email-zhaoshenglong@huawei.com> <1453540813-15764-6-git-send-email-zhaoshenglong@huawei.com> <56A9EE77.5050901@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Stefano Stabellini Cc: ian.campbell@citrix.com, peter.huangpeng@huawei.com, xen-devel@lists.xen.org, julien.grall@citrix.com, stefano.stabellini@citrix.com, shannon.zhao@linaro.org List-Id: xen-devel@lists.xenproject.org On 2016/1/28 18:44, Stefano Stabellini wrote: > On Thu, 28 Jan 2016, Shannon Zhao wrote: >> > On 2016/1/27 22:54, Stefano Stabellini wrote: >>> > > On Sat, 23 Jan 2016, Shannon Zhao wrote: >>>>> > >> > From: Shannon Zhao >>>>> > >> > >>>>> > >> > acpi_boot_table_init() will be called in start_xen to get the RSDP and >>>>> > >> > all the table pointers. With this patch, we can get ACPI boot-time >>>>> > >> > tables from firmware on ARM64. >>>>> > >> > >>>>> > >> > Signed-off-by: Naresh Bhat >>>>> > >> > Signed-off-by: Parth Dixit >>>>> > >> > Signed-off-by: Shannon Zhao >>>>> > >> > --- >>>>> > >> > xen/arch/arm/acpi/Makefile | 1 + >>>>> > >> > xen/arch/arm/acpi/boot.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++ >>>>> > >> > xen/arch/arm/setup.c | 4 ++++ >>>>> > >> > 3 files changed, 63 insertions(+) >>>>> > >> > create mode 100644 xen/arch/arm/acpi/boot.c >>>>> > >> > >>>>> > >> > diff --git a/xen/arch/arm/acpi/Makefile b/xen/arch/arm/acpi/Makefile >>>>> > >> > index b5be22d..196c40a 100644 >>>>> > >> > --- a/xen/arch/arm/acpi/Makefile >>>>> > >> > +++ b/xen/arch/arm/acpi/Makefile >>>>> > >> > @@ -1 +1,2 @@ >>>>> > >> > obj-y += lib.o >>>>> > >> > +obj-y += boot.o >>>>> > >> > diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c >>>>> > >> > new file mode 100644 >>>>> > >> > index 0000000..1570f7e >>>>> > >> > --- /dev/null >>>>> > >> > +++ b/xen/arch/arm/acpi/boot.c >>>>> > >> > @@ -0,0 +1,58 @@ >>>>> > >> > +/* >>>>> > >> > + * ARM Specific Low-Level ACPI Boot Support >>>>> > >> > + * >>>>> > >> > + * Copyright (C) 2001, 2002 Paul Diefenbaugh >>>>> > >> > + * Copyright (C) 2001 Jun Nakajima >>>>> > >> > + * Copyright (C) 2014, Naresh Bhat >>>>> > >> > + * Copyright (C) 2015, Shannon Zhao >>>>> > >> > + * >>>>> > >> > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>>>> > >> > + * >>>>> > >> > + * This program is free software; you can redistribute it and/or modify >>>>> > >> > + * it under the terms of the GNU General Public License as published by >>>>> > >> > + * the Free Software Foundation; either version 2 of the License, or >>>>> > >> > + * (at your option) any later version. >>>>> > >> > + * >>>>> > >> > + * This program is distributed in the hope that it will be useful, >>>>> > >> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of >>>>> > >> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >>>>> > >> > + * GNU General Public License for more details. >>>>> > >> > + * >>>>> > >> > + * You should have received a copy of the GNU General Public License >>>>> > >> > + * along with this program; if not, write to the Free Software >>>>> > >> > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA >>>>> > >> > + * >>>>> > >> > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>>>> > >> > + */ >>>>> > >> > + >>>>> > >> > +#include >>>>> > >> > +#include >>>>> > >> > + >>>>> > >> > +#include >>>>> > >> > + >>>>> > >> > +/* >>>>> > >> > + * acpi_boot_table_init() called from setup_arch(), always. >>>>> > >> > + * 1. find RSDP and get its address, and then find XSDT >>>>> > >> > + * 2. extract all tables and checksums them all >>>>> > >> > + * >>>>> > >> > + * return value: (currently ignored) >>>>> > >> > + * 0: success >>>>> > >> > + * !0: failure >>>>> > >> > + * >>>>> > >> > + * We can parse ACPI boot-time tables such as FADT, MADT after >>>>> > >> > + * this function is called. >>>>> > >> > + */ >>>>> > >> > +int __init acpi_boot_table_init(void) >>>>> > >> > +{ >>>>> > >> > + int error; >>>>> > >> > + >>>>> > >> > + /* Initialize the ACPI boot-time table parser. */ >>>>> > >> > + error = acpi_table_init(); >>>>> > >> > + if ( error ) >>>>> > >> > + { >>>>> > >> > + disable_acpi(); >>>>> > >> > + return error; >>>>> > >> > + } >>>>> > >> > + >>>>> > >> > + return 0; >>>>> > >> > +} >>>>> > >> > diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c >>>>> > >> > index 0ba601e..c15a09d 100644 >>>>> > >> > --- a/xen/arch/arm/setup.c >>>>> > >> > +++ b/xen/arch/arm/setup.c >>>>> > >> > @@ -36,6 +36,7 @@ >>>>> > >> > #include >>>>> > >> > #include >>>>> > >> > #include >>>>> > >> > +#include >>>>> > >> > #include >>>>> > >> > #include >>>>> > >> > #include >>>>> > >> > @@ -749,6 +750,9 @@ void __init start_xen(unsigned long boot_phys_offset, >>>>> > >> > >>>>> > >> > setup_mm(fdt_paddr, fdt_size); >>>>> > >> > >>>>> > >> > + /* Parse the ACPI tables for possible boot-time configuration */ >>>>> > >> > + acpi_boot_table_init(); >>> > > As I asked before, why do you need to call acpi_boot_table_init() before >>> > > vm_init? If you called acpi_boot_table_init() after vm_init(), you >>> > > could implement __acpi_map_table with vmap, which would be better. >>> > > >> > Yes, if we call acpi_boot_table_init() before vm_init, it needs to move >> > end_boot_allocator after acpi_boot_table_init because it will assert in >> > acpi_os_zalloc_memory. > Why does acpi_os_zalloc_memory assert exactly? > If call acpi_boot_table_init after end_boot_allocator, system_state != SYS_STATE_early_boot, acpi_os_zalloc_memory will call xzalloc_bytes to malloc memory but vm_init is not called, so the ASSERT(!ptr || is_xmalloc_memory(ptr)) will occurs. void *__init acpi_os_zalloc_memory(size_t sz) { void *ptr; if (system_state != SYS_STATE_early_boot) { ptr = xzalloc_bytes(sz); ASSERT(!ptr || is_xmalloc_memory(ptr)); return ptr; } ptr = acpi_os_alloc_memory(sz); return ptr ? memset(ptr, 0, sz) : NULL; } -- Shannon