linux-kernel - Re: [PATCH v7 10/17] arm/xen: Get event-channel irq through HVM

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Date:	Wed, 30 Mar 2016 15:34:24 +0800
From:	Shannon Zhao <zhaoshenglong@...wei.com>
To:	Julien Grall <julien.grall@....com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<stefano.stabellini@...rix.com>, <david.vrabel@...rix.com>
CC:	<devicetree@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <catalin.marinas@....com>,
	<will.deacon@....com>, <peter.huangpeng@...wei.com>,
	<xen-devel@...ts.xen.org>
Subject: Re: [PATCH v7 10/17] arm/xen: Get event-channel irq through HVM_PARAM
 when booting with ACPI



On 2016/3/30 0:35, Julien Grall wrote:
> Hi Shannon,
> 
> On 24/03/16 14:44, Shannon Zhao wrote:
>> When booting with ACPI, it could get the event-channel irq through
> 
> The kernel will always get the event-channel IRQ through
> HVM_PARAM_CALLBACK_IRQ.
> 
> So I would say: ", the kernel will get the event-channel..."
> 
>> HVM_PARAM_CALLBACK_IRQ.
>>
>> Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
>> Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
>> ---
>>   arch/arm/xen/enlighten.c | 36 +++++++++++++++++++++++++++++++++++-
>>   1 file changed, 35 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
>> index d94f726..680aae0 100644
>> --- a/arch/arm/xen/enlighten.c
>> +++ b/arch/arm/xen/enlighten.c
>> @@ -30,6 +30,7 @@
>>   #include <linux/time64.h>
>>   #include <linux/timekeeping.h>
>>   #include <linux/timekeeper_internal.h>
>> +#include <linux/acpi.h>
>>
>>   #include <linux/mm.h>
>>
>> @@ -278,6 +279,35 @@ void __init xen_early_init(void)
>>           add_preferred_console("hvc", 0, NULL);
>>   }
>>
>> +static void __init xen_acpi_guest_init(void)
>> +{
>> +#ifdef CONFIG_ACPI
>> +    struct xen_hvm_param a;
>> +    int interrupt, trigger, polarity;
>> +
>> +    a.domid = DOMID_SELF;
>> +    a.index = HVM_PARAM_CALLBACK_IRQ;
>> +    xen_events_irq = 0;
>> +
>> +    if (!HYPERVISOR_hvm_op(HVMOP_get_param, &a)) {
>> +        if ((a.value >> 56) == HVM_PARAM_CALLBACK_TYPE_PPI) {
>> +            interrupt = a.value & 0xff;
>> +            trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
>> +                             : ACPI_LEVEL_SENSITIVE;
>> +            polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
>> +                              : ACPI_ACTIVE_HIGH;
>> +            xen_events_irq = acpi_register_gsi(NULL, interrupt,
>> +                               trigger, polarity);
>> +        }
>> +    }
> 
> Can you invert the condition to remove one layer of indentation?
Sure, will update.

Thanks,
-- 
Shannon