Re: [Xen-devel] [PATCH v4 05/21] arm/acpi: Add basic ACPI initialization

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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 <shannon.zhao@xxxxxxxxxx>
> >> > 
> >> > 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 <naresh.bhat@xxxxxxxxxx>
> >> > Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
> >> > Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> >> > ---
> >> >  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 
> >> > <paul.s.diefenbaugh@xxxxxxxxx>
> >> > + *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@xxxxxxxxx>
> >> > + *  Copyright (C) 2014, Naresh Bhat <naresh.bhat@xxxxxxxxxx>
> >> > + *  Copyright (C) 2015, Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> >> > + *
> >> > + * 
> >> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >> > + *
> >> > + *  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 <xen/init.h>
> >> > +#include <xen/acpi.h>
> >> > +
> >> > +#include <asm/acpi.h>
> >> > +
> >> > +/*
> >> > + * 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 <xen/pfn.h>
> >> >  #include <xen/vmap.h>
> >> >  #include <xen/libfdt/libfdt.h>
> >> > +#include <xen/acpi.h>
> >> >  #include <asm/page.h>
> >> >  #include <asm/current.h>
> >> >  #include <asm/setup.h>
> >> > @@ -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?


> TBH, I'm not sure where acpi_boot_table_init should be called. The
> current way refers to x86.

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