On 2014/11/6 12:10, Bjorn Helgaas wrote:

On Wed, Nov 5, 2014 at 6:58 PM, Yijing Wang [off-list ref] wrote:

quoted

quoted

quoted

+{
+    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