On 12.04.14 23:44, Benjamin Herrenschmidt wrote:
On Sat, 2014-04-12 at 16:31 +0200, Alexander Graf wrote:
Don't we generate PHBs on the fly? How exactly is this going to help
with the problem at hand?
We can still assign the interrupts as a fixed function of the PHB
number...
Yes, but we create those depending on the order with which -device gets
called IIUC. That's really what the underlying issue is. If we had 500
prepopulated PHBs that PCI devices get assigned to we wouldn't have the
problem (but different ones thanks to massive waste of memory and other
resources).
So we either have to create some way to make interrupt numbering a
function of something very simple we plug the PHB into, like a virtual
pseries slot number which we multiply by x to get an irq number range.
Or we'd have to manually link up PHB IRQ lines to XICS IRQ lines on the
command line.
Alex
