Re: [Xen-devel] [PATCH v6 08/31] xen/arm: ITS: Introduce msi_desc for LPIs

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 09/09/15 14:16, Ian Campbell wrote:
> On Mon, 2015-08-31 at 16:36 +0530, vijay.kilari@xxxxxxxxx wrote:
>> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>>
>> Define msi_desc structure for arm and introduce
>> helper functions to access msi_desc member variables.
>>
>> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>> ---
>>  xen/arch/arm/gic-v3-its.c     |   28 ++++++++++++++++++++++++++++
>>  xen/arch/arm/irq.c            |   12 ++++++++++++
>>  xen/include/asm-arm/gic-its.h |    4 ++++
>>  xen/include/asm-arm/irq.h     |    9 +++++++++
>>  4 files changed, 53 insertions(+)
>>
>> diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c
>> index 88cc89d..e70c21a 100644
>> --- a/xen/arch/arm/gic-v3-its.c
>> +++ b/xen/arch/arm/gic-v3-its.c
>> @@ -109,6 +109,34 @@ static void dump_cmd(const its_cmd_block *cmd)
>>  static void dump_cmd(const its_cmd_block *cmd) { }
>>  #endif
>>  
>> +void irqdesc_set_lpi_event(struct irq_desc *desc, unsigned id)
> 
> LPIs are logically part of the GIC, not the ITS, so I think all four of
> these belong at least in a gic (without -its) .c file if not in irq.c.
> 
> Or is there a reason for them to live here?

Putting those helpers in irq.c will require some #ifdery in order to not
compile when GICV3 is not built. I'd like to avoid any #ifdef in the
common code for ITS specific code (see irqdesc_set_its_device).

Although, as I said in a previous mail, those helpers are pointless as
they are only used a couple of time and always in a batch. So we should
result to fetch MSI everytime we'd like to access a field.

Regards,

-- 
Julien Grall

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