linux-kernel - Re: [PATCH v2 2/2] irqchip/gic-v2m: Add support for multiple MSI frames

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Message-ID: <561E750E.8020403@amd.com>
Date:	Wed, 14 Oct 2015 10:30:22 -0500
From:	Suravee Suthikulanit <suravee.suthikulpanit@....com>
To:	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>
CC:	Duc Dang <dhdang@....com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] irqchip/gic-v2m: Add support for multiple MSI
 frames

On 10/14/2015 10:28 AM, Marc Zyngier wrote:
> On 14/10/15 15:13, Suravee Suthikulanit wrote:
>> Hi Marc,
>>
>> On 10/14/2015 6:27 AM, Marc Zyngier wrote:
>>> The GICv2m driver is so far limited to a single MSI frame, but
>>> nothing prevents an implementation from having several of them.
>>>
>>> This patch expands the driver to enumerate all frames, keeping
>>> the first one as the canonical identifier for the MSI domains.
>>>
>>> Tested-by: Duc Dang <dhdang@....com>
>>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>>> ---
>>>    drivers/irqchip/irq-gic-v2m.c | 124 ++++++++++++++++++++++++++----------------
>>>    1 file changed, 78 insertions(+), 46 deletions(-)
>>>
>>> diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
>>> index bf9b3c0..87f8d10 100644
>>> --- a/drivers/irqchip/irq-gic-v2m.c
>>> +++ b/drivers/irqchip/irq-gic-v2m.c
>>> @@ -50,8 +50,12 @@
>>>    /* List of flags for specific v2m implementation */
>>>    #define GICV2M_NEEDS_SPI_OFFSET		0x00000001
>>>
>>> +static LIST_HEAD(v2m_nodes);
>>> +static DEFINE_SPINLOCK(v2m_lock);
>>> +
>>>    struct v2m_data {
>>> -	spinlock_t msi_cnt_lock;
>>> +	struct list_head entry;
>>> +	struct device_node *node;
>>
>> Would it be better if we use struct fwnode_handle * here instead. I
>> noticed that later on, this is also used as of_node_to_fwnode(v2m->node)
>> in several places. Also, this would need to change anyways when we
>> introducing ACPI support (see here https://lkml.org/lkml/2015/10/13/846).
>
> I was thinking that it would be part of your series adapting it to ACPI.
> I don't mind either way...
>
> Thanks,
>
> 	M.
>

Ok, I'll rebase the GICv2m ACPI support on top of this multi-frame 
change and send out V2 If this won't be changing again any time soon.

Thanks,
Suravee

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