[PATCH RFC] nvme-core: Log the ctrl device instance name

[Sagi Grimberg]

>> Having the ctrl instance name "nvmeX" seems much more friendly than
>> the underlying device name. Also, with other nvme transports
>> such as the soon to come nvme-loop we don't have an underlying
>> device and it doesn't makes sense to make up one.
>
> For PCI, I think this is okay if you add a message each time a device gets
> an instance that ties it back to PCI device's name. Without something
> like that, it doesn't look straight forward to match the NVMe device
> name to it's PCI function just from the logs.

That sounds ok to me too.

So I'll convert the pci.c logging as well and add a log message that
ties an instance to a pci function.

Thanks Keith!