On Fri, 2019-06-14 at 08:12 -0500, Bjorn Helgaas wrote: > On Fri, Jun 14, 2019 at 08:43:19PM +1000, Benjamin Herrenschmidt > wrote: > > > This least to another conversation we hinted at earlier.. we should > > probably have a way to do the same at least for BARs on ACPI > > systems so > > we don't have to temporarily disable access to a device to size > > them. > > The PCI Enhanced Allocation capability provides a way to do this. I > don't know how widely used it is, but it's theoretically possible. Ok, I have to read about this. I haven't seen a device with that on yet, it looks messy at a quick glance. Can ACPI convey the information ? On powerpc and sparc64 we have ways to read the BAR values from the device-tree created by OF when it assigned them. Cheers, Ben.
