Re: [Xen-devel] [PATCH v7 20/28] xen/arm: ITS: Add virtual ITS availability check helper

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 24/09/15 07:44, Vijay Kilari wrote:
> On Wed, Sep 23, 2015 at 2:22 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
>> Hi Vijay,
>>
>> On 18/09/15 14:09, vijay.kilari@xxxxxxxxx wrote:
>>> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>>>
>>> Introduce vgic_is_lpi_supported() helper function
>>> to know virtual ITS availability for a domain
>>>
>>> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>>> ---
>>> v7: - its_enabled field is added to vgic structure
>>> ---
> [...]
>>> diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
>>> index a5ab99d9..3555833 100644
>>> --- a/xen/arch/arm/vgic.c
>>> +++ b/xen/arch/arm/vgic.c
>>> @@ -62,6 +62,11 @@ struct vgic_irq_rank *vgic_rank_irq(struct vcpu *v, 
>>> unsigned int irq)
>>>      return vgic_get_rank(v, rank);
>>>  }
>>>
>>> +bool_t vgic_is_lpi_supported(struct domain *d)
>>> +{
>>> +    return d->arch.vgic.its_enabled;
>>> +}
>>
>> Please move this helper as a static inline to allow the compiler
>> inlining the code.
>>
> 
>   This function is used in vgic-v3.c later. Hence this function is exported.

I though you knew that a static inline function can live in the header...

> 
>>> +
>>>  static void vgic_init_pending_irq(struct pending_irq *p, unsigned int virq)
>>>  {
>>>      INIT_LIST_HEAD(&p->inflight);
>>> diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
>>> index 011f85b..0f6f9d8 100644
>>> --- a/xen/include/asm-arm/domain.h
>>> +++ b/xen/include/asm-arm/domain.h
>>> @@ -93,6 +93,7 @@ struct arch_domain
>>>          int ctlr;
>>>          int nr_spis; /* Number of SPIs */
>>>          int nr_lpis; /* Number of LPIs */
>>> +        bool_t its_enabled;
>>
>> The field is GICv3 specific and should go within the HAS_GICV3 section
>> below.
>>
>> Although, I don't think having this boolean is necessary. You can know
>> whether we support LPIs or not by checking either the nr_lpis > 0 or
>> vits != NULL.
>>
>> The former would be the best if you plan to keep an helper.
> 
> I will drop its_enabled field and helper will be updated as below.
> 
> bool_t vgic_is_lpi_supported(struct domain *d)
> {
>     return (d->arch.vgic.nr_lpis != 0);
> }

+ static inline and move in the header.

Regards,

-- 
Julien Grall

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