Re: [PATCH kernel] powerpc/pci/of: Parse unassigned resources

On 18/06/2019 22:15, Michael Ellerman wrote:

Alexey Kardashevskiy [off-list ref] writes:

quoted

The pseries platform uses the PCI_PROBE_DEVTREE method of PCI probing
which is basically reading "assigned-addresses" of every PCI device.
However if the property is missing or zero sized, then there is
no fallback of any kind and the PCI resources remain undiscovered, i.e.
pdev->resource[] array is empty.

This adds a fallback which parses the "reg" property in pretty much same
way except it marks resources as "unset" which later makes Linux assign
those resources with proper addresses.

What happens under PowerVM is the big question.

ie. if we see such a device under PowerVM and then do our own assignment
what happens?

I'd be surprised not to see at least one "assigned-addresses" under
powervm, and a single assigned bar will do the old behavior.

I guess I could make it depend on "linux,pci-probe-only" (which I will
need for this to work anyway), if that helps, should I?


-- 
Alexey