在 2015/9/25 3:30, Marc Zyngier 写道:
> On Wed, 23 Sep 2015 15:24:50 +0800
> "majun (F)" <[email protected]> wrote:
>
> [...]
>
>>>> +static int mbigen_device_init(struct mbigen_chip *chip,
>>>> + struct device_node *node)
[...]
>>>> +
>>>> +core_initcall(mbigen_init);
>>>
>>> That's the wrong thing to do. The interrupt controller should be
>>> probed with IRQCHIP_DECLARE(). Yes, this creates a dependency
>>> problem between the MSI layer and the irqchip layer, but that
>>> should be easy (-ish) to solve.
>>
>> Based on our discusstion about DTS,I will change the code likes below:
>> IRQCHIP_DECLARE(hisi_mbigen, "hisilicon,mbigen-v2", mbigen_of_init);
>>
>> Mbigen device is initialized as a interrupt controller.
>>
>> But I still can't call platform_msi_domain_alloc_irqs()
>> to apply the msi irqs.
>>
>> It think this is what you said "dependency problem between
>> the MSI layer and the irqchip layer" , am i right ?
>>
>> Do you have any idea about this problem?
>
> You need to have multiple phases for initializing this beast:
> - IRQCHIP_DECLARE() to create the irqchips, allocate the domains and
> the main data structures,
> - platform device probing of the top-level device to do some HW probing
> and to kick of_platform_populate on the subnodes,
> - Handle the the subnode probing, allocate the MSIs, and finish the
> initialization of the irqchip how that you have all the information.
Ok, I got it. But I still have a question.
According to your suggestions, the initial flow is:
Step1: IRQCHIP_DECLARE() to create the irqchips, allocate the domains and
the main data structures,
Step2: Parse the device node and apply the irq(named as *device-virq*) within
mbigen-device
domain (handled by irq core code).
Step3: platform device probing of the top-level device to do some HW probing
and to kick of_platform_populate on the subnodes,
Step4: Handle the the subnode probing, allocate the MSIs(named as *msi-virq*),
and finish the
initialization of the irqchip how that you have all the information.
My questions is:
How to connect msi-virq and device-virq ?
In my v4 version, I used the
irq_set_chained_handler(msi-virq, mbigen_handle_cascade_irq);
as msi-virq primary handler function .
Then find device-virq in mbigen_handle_cascade_irq()
and call device-virq corresponding handler fucntion.
But it seems not a right solution.
So I want try another solution for this problem.
[1] In step2, when the interrupt controller map function is called, using
irq_set_chip_and_handler(device-irq, &mbigen_irq_chip,
handle_fasteoi_irq);
[2] In step4, using
for_each_msi_entry(desc, &mgn_dev->dev) {
request_irq( msi-virq, msi_irq_handler, **);
}
But I am not sure about this solution, please review this and offer me some
suggestions.
Best Regards,
Ma Jun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
