Subject: [PATCH v4 14/18] ARM64 / ACPI: Add GICv2 specific ACPI boot support

From: [email-masked] (Jon Masters)
Date: Mon, 15 Sep 2014 12:16:21 -0400

On 09/15/2014 11:01 AM, Catalin Marinas wrote:
> On Fri, Sep 12, 2014 at 03:00:12PM +0100, Hanjun Guo wrote:
>> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
>> index 5b3546b..9869377 100644
>> --- a/arch/arm64/kernel/acpi.c
>> +++ b/arch/arm64/kernel/acpi.c
>> @@ -23,6 +23,7 @@
>>  #include <linux/irqdomain.h>
>>  #include <linux/bootmem.h>
>>  #include <linux/smp.h>
>> +#include <linux/irqchip/arm-gic-acpi.h>
>>  
>>  #include <asm/cputype.h>
>>  #include <asm/cpu_ops.h>
>> @@ -312,6 +313,28 @@ void __init acpi_boot_table_init(void)
>>  		pr_err("Can't find FADT or error happened during parsing FADT\n");
>>  }
>>  
>> +void __init acpi_gic_init(void)
>> +{
>> +	struct acpi_table_header *table;
>> +	acpi_status status;
>> +	acpi_size tbl_size;
>> +	int err;
>> +
>> +	status = acpi_get_table_with_size(ACPI_SIG_MADT, 0, &table, &tbl_size);
>> +	if (ACPI_FAILURE(status)) {
>> +		const char *msg = acpi_format_exception(status);
>> +
>> +		pr_err("Failed to get MADT table, %s\n", msg);
>> +		return;
>> +	}
>> +
>> +	err = gic_v2_acpi_init(table);
>> +	if (err)
>> +		pr_err("Failed to initialize GIC IRQ controller");
>> +
>> +	early_acpi_os_unmap_memory((char *)table, tbl_size);
>> +}
> 
> Maybe this was discussed already but why does this function need to live
> under arch/arm64? Isn't the driver code more appropriate?

Well there's two halves to this, right? There's the MADT parsing/setup,
which is architecture specific, and then there's the GIC irqchip
initialization which lives under drivers.

Jon.