linux-kernel - Re: [PATCH v2 3/5] irqchip/gic: Convert the GIC driver to ACPI probing

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Date:	Wed, 16 Sep 2015 18:28:39 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, Tomasz Nowicki <tn@...ihalf.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>
CC:	linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] irqchip/gic: Convert the GIC driver to ACPI probing

On 16/09/15 16:05, Hanjun Guo wrote:
> Hi Marc,
> 
> On 09/13/2015 10:02 PM, Marc Zyngier wrote:
> [...]
>> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
>> index e6b7ed5..8a0b9c3 100644
>> --- a/drivers/irqchip/irq-gic.c
>> +++ b/drivers/irqchip/irq-gic.c
>> @@ -41,7 +41,6 @@
>>   #include <linux/irqchip.h>
>>   #include <linux/irqchip/chained_irq.h>
>>   #include <linux/irqchip/arm-gic.h>
>> -#include <linux/irqchip/arm-gic-acpi.h>
>>
>>   #include <asm/cputype.h>
>>   #include <asm/irq.h>
>> @@ -1177,7 +1176,7 @@ IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
>>   #endif
>>
>>   #ifdef CONFIG_ACPI
>> -static phys_addr_t dist_phy_base, cpu_phy_base __initdata;
>> +static phys_addr_t cpu_phy_base __initdata;
>>
>>   static int __init
>>   gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
>> @@ -1205,60 +1204,56 @@ gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
>>   	return 0;
>>   }
>>
>> -static int __init
>> -gic_acpi_parse_madt_distributor(struct acpi_subtable_header *header,
>> -				const unsigned long end)
>> +/* The things you have to do to just *count* something... */
>> +static int __init acpi_dummy_func(struct acpi_subtable_header *header,
>> +				  const unsigned long end)
>>   {
>> -	struct acpi_madt_generic_distributor *dist;
>> +	return 0;
>> +}
>>
>> -	dist = (struct acpi_madt_generic_distributor *)header;
>> +static bool __init acpi_gic_redist_is_present(void)
>> +{
>> +	return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
>> +				     acpi_dummy_func, 0) > 0;
>> +}
>>
>> -	if (BAD_MADT_ENTRY(dist, end))
>> -		return -EINVAL;
>> +static bool __init gic_validate_dist(struct acpi_subtable_header *header,
>> +				     struct acpi_probe_entry *ape)
>> +{
>> +	struct acpi_madt_generic_distributor *dist;
>> +	dist = (struct acpi_madt_generic_distributor *)header;
>>
>> -	dist_phy_base = dist->base_address;
>> -	return 0;
>> +	return (dist->version == ape->driver_data &&
>> +		(dist->version != ACPI_MADT_GIC_VERSION_NONE ||
>> +		 !acpi_gic_redist_is_present()));
>>
> 
> When I was rebasing the GICv3 patches on top of yours, I noticed
> that GICv3 will also needs to check the acpi_gic_redist_is_present(),
> can we move the code above to some common place, or just leave
> the code duplicate but self-contained?

Please keep it self-contained so far. We can "optimize" later.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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