linux-kernel - Re: [PATCH 04/20] ARM64 / ACPI: Introduce arm

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Date:	Mon, 20 Jan 2014 20:26:36 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <Sudeep.Holla@....com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	Al Stone <al.stone@...aro.org>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>
Subject: Re: [PATCH 04/20] ARM64 / ACPI: Introduce arm_core.c and its related
 head file

On 2014-1-18 0:56, Sudeep Holla wrote:
> On 17/01/14 12:24, Hanjun Guo wrote:
>> Introduce arm_core.c and its related head file, after this patch,
>> we can get ACPI tables from firmware on ARM64 now.
>>
>> Signed-off-by: Al Stone <al.stone@...aro.org>
>> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> ---
>>  arch/arm64/include/asm/acpi.h |   57 +++++++++++
>>  arch/arm64/kernel/setup.c     |    6 ++
>>  drivers/acpi/Makefile         |    2 +
>>  drivers/acpi/plat/Makefile    |    1 +
>>  drivers/acpi/plat/arm-core.c  |  209 +++++++++++++++++++++++++++++++++++++++++
>>  5 files changed, 275 insertions(+)
>>  create mode 100644 drivers/acpi/plat/Makefile
>>  create mode 100644 drivers/acpi/plat/arm-core.c
>>
>> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
>> index cf19dc6..908d71b 100644
>> --- a/arch/arm64/include/asm/acpi.h
>> +++ b/arch/arm64/include/asm/acpi.h
>> @@ -19,6 +19,43 @@
>>  #ifndef _ASM_ARM64_ACPI_H
>>  #define _ASM_ARM64_ACPI_H
>>  
>> +#include <asm/cacheflush.h>
>> +
>> +#include <linux/init.h>
>> +
>> +#define COMPILER_DEPENDENT_INT64	s64
>> +#define COMPILER_DEPENDENT_UINT64	u64
>> +
>> +/*
>> + * Calling conventions:
>> + *
>> + * ACPI_SYSTEM_XFACE        - Interfaces to host OS (handlers, threads)
>> + * ACPI_EXTERNAL_XFACE      - External ACPI interfaces
>> + * ACPI_INTERNAL_XFACE      - Internal ACPI interfaces
>> + * ACPI_INTERNAL_VAR_XFACE  - Internal variable-parameter list interfaces
>> + */
>> +#define ACPI_SYSTEM_XFACE
>> +#define ACPI_EXTERNAL_XFACE
>> +#define ACPI_INTERNAL_XFACE
>> +#define ACPI_INTERNAL_VAR_XFACE
>> +
>> +/* Asm macros */
>> +#define ACPI_FLUSH_CPU_CACHE() flush_cache_all()
>> +
>> +/* Basic configuration for ACPI */
>> +#ifdef	CONFIG_ACPI
>> +extern int acpi_disabled;
>> +extern int acpi_noirq;
>> +extern int acpi_pci_disabled;
>> +extern int acpi_strict;
>> +
>> +static inline void disable_acpi(void)
>> +{
>> +	acpi_disabled = 1;
>> +	acpi_pci_disabled = 1;
>> +	acpi_noirq = 1;
>> +}
>> +
>>  static inline bool arch_has_acpi_pdc(void)
>>  {
>>  	return false;	/* always false for now */
>> @@ -29,4 +66,24 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)
>>  	return;
>>  }
>>  
>> +static inline void acpi_noirq_set(void) { acpi_noirq = 1; }
>> +static inline void acpi_disable_pci(void)
>> +{
>> +	acpi_pci_disabled = 1;
>> +	acpi_noirq_set();
>> +}
>> +
>> +/* FIXME: this function should be moved to topology.h when it's ready */
>> +void arch_fix_phys_package_id(int num, u32 slot);
>> +
>> +/* temperally define -1 to make acpi core compilerable */
>> +#define cpu_physical_id(cpu) -1
>> +
> 
> I assume `cpu` here is logical cpu id in which case you can define it to be same
> as cpu_logical_map ?

Yes. it is about the hardware id of CPU and may refer to MPIDR in ARM/ARM64.

Thanks
Hanjun

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