On 2014/11/6 12:10, Bjorn Helgaas wrote:
> On Wed, Nov 5, 2014 at 6:58 PM, Yijing Wang <wangyijing@xxxxxxxxxx> wrote:
>
>>>> +{
>>>> + return (irq_hw_number_t)msidesc->msi_attrib.entry_nr |
>>>> + PCI_DEVID(pdev->bus->number, pdev->devfn) << 11 |
>>>> + (pci_domain_nr(pdev->bus) & 0xFFFFFFFF) << 27;
>>>
>>> Where does this bit layout come from? Is this defined in the spec
>>> somewhere? A reference would help.
>>
>> Currently, more and more Non-PCI device use MSI(or similar MSI mechanism), like DMAR fault irq
>> and HPET FSB irq. And we have to add additional code to support the MSI capability.
>> So I hope we can decouple MSI code and PCI code, then we can unify all MSI(or Message Based interrupt)
>> in one framework.
>
> Was that supposed to answer my question? If so, I didn't understand
> how it explains where the bit layout came from.
No, that's just my concern. Because this function uses the pci device id,
but more and more Non-PCI devices use MSI.
>
> Bjorn
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> .
>
--
Thanks!
Yijing
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