Re: [PATCH 1/6] PCI Express Advanced Error Reporting Driver

[Linas Vepstas <linas@austin.ibm.com>]

Hi,

On Fri, Mar 11, 2005 at 04:12:18PM -0800, long was heard to remark:

> +void hw_aer_unregister(void)
> +{
> +	struct pci_dev *dev = (struct pci_dev*)host->dev;
> +	unsigned short id;
> +
> +	id = (dev->bus->number << 8) | dev->devfn;
> +	
> +	/* Unregister with AER Root driver */
> +	pcie_aer_unregister(id);
> +}

I don't understand how this can work on a system with 
more than one domain.  On any midrange/high-end system, 
you'll have a number of devices with identical values
for (bus->number << 8) | devfn)

For example, on my system, lspci prints out:

mosquito:~ # lspci
0000:00:01.0 Co-processor: IBM: Unknown device 00e0 (rev 01)
0000:00:03.0 ISA bridge: Symphony Labs W83C553 (rev 10)
0001:00:02.0 PCI bridge: IBM: Unknown device 0188 (rev 02)
0001:00:02.2 PCI bridge: IBM: Unknown device 0188 (rev 02)
0001:00:02.3 PCI bridge: IBM: Unknown device 0188 (rev 02)
0001:00:02.4 PCI bridge: IBM: Unknown device 0188 (rev 02)
0001:00:02.6 PCI bridge: IBM: Unknown device 0188 (rev 02)
0001:01:01.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1010
66MHz  Ultra3 SCSI Adapter (rev 01)
0001:01:01.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1010
66MHz  Ultra3 SCSI Adapter (rev 01)
0001:21:01.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro
100] (rev 0d)
0002:00:02.0 PCI bridge: IBM: Unknown device 0188 (rev 02)
0002:00:02.2 PCI bridge: IBM: Unknown device 0188 (rev 02)
0002:00:02.4 PCI bridge: IBM: Unknown device 0188 (rev 02)
0002:00:02.6 PCI bridge: IBM: Unknown device 0188 (rev 02)


Here, 'Unknown device' is actually an empty slot.

If I plugged the ethernet card in a few slots over, it would 
show up as

0002:01:01.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro

and so it would have the exact same (bus->number << 8) | devfn)
as the scsi device.

Or am I being stupid/dense/all-of-the-above?

--linas