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SubjectRe: [PATCH v2 5/6] PCI: brcmstb: Add panic/die handler to RC driver
On Mon, Nov 30, 2020 at 04:11:42PM -0500, Jim Quinlan wrote:
> Whereas most PCIe HW returns 0xffffffff on illegal accesses and the like,
> by default Broadcom's STB PCIe controller effects an abort. This simple
> handler determines if the PCIe controller was the cause of the abort and if
> so, prints out diagnostic info.

What happens during enumeration? pci_bus_generic_read_dev_vendor_id()
assumes a read of Vendor ID returns 0xffffffff if the device doesn't
exist.

I assume this case doesn't cause the abort you're referring to here,
or nothing would work. I think this enumeration case results in PCIe
Unsupported Request errors (PCIe r5.0, sec 2.3.2 implementation note).

Bjorn

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