# \[PATCH v5 04/19\] PCI/MSI: Add hooks to populate the msi\_domain field

- From: Bjorn Helgaas \<bhelgaas@google.com\>
- Date: 2015-07-23 15:37:22 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2015/07/4541629
- Thread: https://ratatoskr.run/linux-arm-kernel/2015/07/4541343/t.md

```text
On Thu, Jul 23, 2015 at 9:52 AM, Marc Zyngier [ref] wrote:
> On 23/07/15 14:06, Bjorn Helgaas wrote:
>> On Thu, Jul 23, 2015 at 10:26:23AM +0100, Marc Zyngier wrote:
>>> In order to be able to populate the device msi_domain field,
>>> add the necessary hooks to propagate the host bridge msi_domain
>>> across secondary busses to devices.
>>>
>>> So far, nobody populates the initial msi_domain.
>>>
>>> Signed-off-by: Marc Zyngier <redacted>
>>
>> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
>>
>>> +static void pci_set_msi_domain(struct pci_dev *dev)
>>> +{
>>> +    /*
>>> +     * If no domain has been set through the pcibios callback,
>>> +     * inherit the default from the bus device.
>>
>> Nit: there isn't a pcibios callback anymore.
>
> There is actually one, in pci_add_device:
>
>         [...]
>         ret = pcibios_add_device(dev);
>         WARN_ON(ret < 0);
>
>         /* Setup MSI irq domain */
>         pci_set_msi_domain(dev);
>         [...]
>
> pcibios_add_device is the one I was referring to. I'll clarify the comment.

Oh, right!  I thought you were referring to
pcibios_set_host_bridge_msi_domain(), which got removed, but of course
that wouldn't even make sense.
```